Questions&Answers

Common causes

1, small fire damper air volume setting is too large

2、The oil nozzle of the large fire is dirty or damaged

3、High oil viscosity is not easy to atomize

4、Improper distance between the burner and oil nozzle

5、Oil temperature is too high, so that the oil vaporization oil return is not smooth

6、Oil mixed with water

Solution

1、Progressively adjust the dampers smaller

2、Wipe clean or replace the new

3、Dilute the fuel with diesel

4、Adjust in 0-10mm

5、Lower the oil temperature appropriately

6、Change the oil and then retry

Common causes

1、Controller malfunction

2、The electric eye sensing part is not clear

3、The temperature around the burner is too high

4, the oil pump shaft is too tight to aggravate the motor load

5、Overload operation, or the water level fluctuates too much

Solution

1、Repair or replace

2、Clean sensing part

3、Improve the boiler room environment, reduce the temperature of the boiler room

4、Stop the furnace for maintenance, so that the rotating shaft runs freely

5、Ensure operation within the rated output, adjust the load smoothly

1、Biomass energy

With the tightening of energy conditions and the increasingly serious problem of environmental pollution, various industries have begun to gradually strengthen their awareness of the use of renewable energy sources, of which the use of biomass energy is currently the most practical and feasible solution. Biomass is the material that exists on earth, it includes all animals, plants and microorganisms and many organic matter derived from these living materials, excretion and metabolism, all kinds of biomass has a certain amount of energy, with biomass as the carrier, the energy generated by biomass is biomass energy.

2、Biomass burner

Biomass burner is a kind of biomass semi-gasification automatic control burner to biomass pellets and other organic biomass as fuel biomass high temperature cracking burner, generally divided into air-cooled biomass burner and water-cooled biomass burner two models.

3, biomass burner applications

At present, biomass burners have been widely used in hot water boilers, steam boilers, painting and ovens, aluminum profiles, aluminum die-casting, aluminum alloy die-casting, centralized melting furnace, copper rod heating, stainless steel casting, chemical drying, spraying, industrial kilns, puffing furnace, aging furnace and other industries with heating.

4、Characteristics of biomass burner

(1) Full combustion of fuel, high efficiency: fuel through high greenhouse combustion cracking, complete combustion, combustion efficiency of more than 93%, no smoke, no smell, no harmful gases.

(2) Heat recycling: circulating air cools down the outside of the high greenhouse and obtains hot air blowing into the high greenhouse to boost combustion, increasing the temperature of the high greenhouse and saving fuel costs even more.

(3) Significant environmental benefits: renewable biomass as an energy fuel, to achieve sustainable use of the source, high-temperature combustion cracking, flue gas emissions of nitrogen oxides, carbon dioxide, dust, etc. very low, high-temperature combustion, tar in the gaseous state of direct combustion, no water washing, no secondary pollution.

(4) Disadvantages: biomass burner is large, occupies space, and the combustion material is solid, there is dust slag deposited in the bottom of the furnace after combustion, and needs to be cleaned regularly.

Industrial burners are what we commonly call burners, with a wide range of types, specifications and forms, divided into three main categories: oil, gas and coal-fired. As a kind of machinery used to supply heat, burners are mainly used in boilers, industrial furnaces, melting furnaces, incinerators, drying equipment, kitchen equipment, food drying equipment, baking equipment, ironing equipment, industrial annealing furnaces, drying equipment, road building machinery and equipment, textile burners, asphalt heating equipment and various other heat industries, and are quite irreplaceable in today's technologically advanced industry.

Burners have come a long way from the beginning of their use to the diverse forms they now take. Going back in time, there have been people using burners in simple forms for manufacturing as far back as our ancient times. With the rise of modern industry in Europe, burners were developed and profound changes took place in theory as well as in structure. In order to meet the requirements of different processes, a wide variety of burners have been designed and, with the development of the gas industry, new burners have been created and the future direction of burner development will be more dependent on the needs of industry and the environment.

As a professional company committed to burner technology innovation and research and development innovation, not only do we provide foreign high performance products and quality services, but more importantly, we bring the concept of energy saving and environmental protection to China, creating an era of green combustion and providing customers with the perfect solution in the field of combustion.

In the energy-saving equipment industry, there is a term called flameless combustion. Flameless combustion means that the burner pre-mixes gas and air in a certain proportion to form a combustible mixture before combustion, and then ejects from the gas burner for combustion, which is a power combustion type and can achieve the purpose of environmental protection.

1.Characteristics of flameless combustion

Flameless combustion because the gas and air have been pre-mixed before entering the oil burner, no longer need mixing time in the combustion process, so the total time of the combustion process actually depends on the chemical reaction time; the air coefficient required to complete the combustion of gas is very small, generally 1.05~1.15, or even as low as 1.03~1.05, while the degree of combustion is very high, and its chemical incomplete combustion loss is close to Nearly zero. This combustion method combustion temperature is high, close to the theoretical combustion temperature, combustion flame is short and transparent, no obvious outline, in the background of the hot combustion pit, even can not see the flame, so called flameless combustion.

2.Advantages of flameless combustion

make the burner self-adjusting; simple and reliable mixing device; fast combustion speed, etc.

3.Flameless combustion in industry

Oil burners such as to achieve flameless combustion can be used in a variety of ways, including industrial burner manufacturers widely used is the use of injectors, gas as the injection medium, air as the medium to be injected (in a few cases there are also air as the injection medium), so that the two through the injector to achieve uniform mixing. This device is called jet flameless burner, or simply jet burner.

Advantages of gas fuels

(1) Combined characteristics of essentially non-polluting combustion.

Gas fuel is a relatively clean fuel. Its ash, sulfur content and nitrogen content are much lower than those of coal and oil fuels, and the dust content in gas is extremely low. Recent years. Due to the advancement of desulfurization technology for gas fuels, the occurrence of Sox can be almost negligible during combustion. The nitrogen contained in gas fuels is converted to Nox less during combustion than other fuels, and the suppression of the amount of Nox generated at high temperatures is easier to achieve than other fuels. Therefore, it provides favorable conditions for protecting the environment. At the same time, gas fuels are transported by pipeline and there is no ash, which basically eliminates harmful gases, dust and noise disturbances that occur during transportation and storage.

(2) Easy combustion adjustment

When burning gas fuel, as long as the nozzle is selected appropriately, it is possible to adjust the combustion in a wide range, and it is also possible to achieve fine-tuning of the combustion to make it in the best condition. The fuel gas fuel can not only adapt to low oxyfuel combustion, but also has the characteristic of being able to quickly adapt to load changes. This provides favorable conditions for reducing combustion consumption and increasing combustion efficiency.

(3) Good operability

Compared with oil fuel, gas fuel delivery does not require a series of viscosity reduction, insulation and heating pre-treatment devices, and storage measures are not required at the customer's premises. Therefore, the gas system is simple, easy to operate and manage, and easy to automate. In addition, gas has almost no ash, allowing a significant increase in flue gas flow rate, and the ash accumulation and pollution on the heating surface is far less than when burning coal or oil, and no soot blowing equipment is required. Under other similar conditions, the thermal intensity of the gas boiler chamber is higher than that of coal-fired and oil-fired boilers, therefore, the small size of gas boilers, metal, refractory, insulation and other materials, as well as construction investment is greatly reduced.

(4) Easy adjustment of heat generation

Especially when burning LPG natural material, adding air to the part avoiding the explosion range, the heat can be adjusted arbitrarily as needed. Therefore, in the LPG storage and distribution station there is a permanent blower or compressed air to dilute the gas.

Disadvantages of gas fuels

The main disadvantage of gas fuel is that it mixes with air in a certain ratio to form explosive gases, and most components of gas fuel are asphyxiating or toxic to humans and animals, placing high demands on the safety technology used.

The following issues should be noted during the use of gas fuels

(1) Corrosion of pipes.

As NH3 is alkaline in water, H2S, SCN, SO2 and CO2 are acidic in water, and O2 causes oxidative corrosion in water, so when the fuel contains the above components and contains water, it will corrode the pipe, so the water contained in the fuel should be removed.

(2) Toxicity to people.

In the gas combustion section contains H2S, SCN, CO, SO2, NH3, C6H6 and other toxic components, when it exceeds the limit of toxicity can cause death, in the use of gas fuel must pay attention to this issue.

(3) the explosion limit range.

Gas fuel in some of the components and air to reach a certain mixing ratio, it may reach the explosive limit range. In the combustion device to stop working, due to poorly closed fuel supply valve or valve damage, it is possible that the fuel leakage into the combustion device and mixed with air to reach the explosive limit, when the ignition is started again will cause explosive accidents. Therefore, in addition to requiring the valve to be airtight, the combustion unit should be purged with air before starting the ignition.

Burner rotor scale is composed of rotor, mounting frame, transmission device, weight measuring system and soft joint. The rotor is mounted in an explosion-proof housing together with the sealing plate. The whole burner rotor scale shell and the rotor transmission device are suspended in a frame as a whole. There are two fixed rolling bearing pedestals suspended from the frame to support the burner rotor scales. The third suspension is connected to a weighing device with a load sensor. The feed pipe, discharge pipe and compressed air pipe of the burner rotor balance are provided with soft joints connected with the corresponding parts.

The feeding process of the burner rotor scale is: pulverized coal is directly discharged from the pulverized coal silo through the sliding gate, and enters the rotor part through the soft joint at the entrance. The pulverized coal is taken away by the compartment of the rotor, rotated 225°, and reaches the discharge area. The air of the bottom compressed air pipe blows the pulverized coal in and out of the material port and sends it to the burner.

The rotor shell is made of ductile iron and is divided into two parts: upper shell and lower shell. The upper shell is provided with a feed port and a discharge port, and the lower shell is provided with an air inlet and a flange for the butt of the transmission device. The rotor is cast iron composed of two rows of interlocking small compartments connected to the drive shaft through the central hub. On the upper and lower sides of the rotor, there are two sealing plates respectively. The sealing plate is a special casting. The specific clearance between the rotor and the sealing plate can be adjusted by special screws in the housing. The whole rotor and the sealing plate are installed in the shell of the burner rotor scale. The explosion-proof design can withstand the sudden pressure of 1 Mpa. The reducer of the transmission device is connected with the lower shell of the burner rotor scale by a flange. The DC speed regulating motor is transferred to the reducer through the toothed belt. The output shaft of the reducer is connected with the shaft of the rotor. The digital speed measuring motor is connected with the driving device, and the rotor speed is measured by the contactless sensor. The weight measuring system is composed of load sensor balance and damping device.

To ensure reduction and reducing and the bias stability of heavy equipment, in order to make the transmission power consumption and low degree of wear of the internal parts, Pfister company to solve some special technical problems, which is used for the hydrostatic bearing system of balance of the rotor of the burner and load with a pneumatic control device internal seal on the pipeline to burner, using method of the pressure vessel formation arc small air barrier to feed, with the exhaust pipe cleaning nozzle arc storehouse.

In the production process of cement industry, the problem of erosion and wear of the inner wall of the inlet and outlet of the pulverized coal rotor scale of the burner is often encountered. Under normal conditions, most enterprises repair or even directly scrap and replace by surfacing abrasion resistant electrode. Generally speaking, the surfacing effect is not ideal, and the cost of scrap replacement of imported parts is relatively high. Therefore, the wear of pulverized coal rotor scales of the burner, which is washed by pulverized coal for a long time, has also become an equipment problem affecting the continuous and normal production of cement enterprises. Polymer composite material technology relies on the structure of the material itself to bring strong adhesion, high wear resistance, impact and erosion resistance and other properties to fully realize the rapid operation of the site and repair after the completion of the use effect.

Burner pulverized coal rotor scale feed port erosion wear repair

In the working process of pulverized coal burner rotor scale, the inlet part bears the serious erosion and wear process. The medium environment of this part is very bad, which often causes the wear of the inlet. When serious, it can cause shell perforation and cause significant damage to the equipment. This kind of problem exists in the use of equipment for a long time, and it is difficult to solve by using the conventional general repair method, the replacement cost is high, and the enterprise increases a lot of downtime, which seriously affects the normal production schedule. This problem can be solved by the excellent wear resistance and good plasticity of the technical products.

Burner pulverized coal rotor scale discharge port erosion wear repair

In the working process of pulverized coal burner rotor scale, the outlet part bears the serious erosion and wear process. The medium environment of this part is very bad, which often causes the wear of the outlet. When serious, it can cause shell perforation and cause significant damage to the equipment. This kind of problem exists in the use of equipment for a long time, and it is difficult to solve by using the conventional general repair method, the replacement cost is high, and the enterprise increases a lot of downtime, which seriously affects the normal production schedule. This problem can be solved by the excellent wear resistance and good plasticity of the technical products.

The shell part of the pulverized coal burner rotor scale bears serious erosion and wear process in the working process. The medium environment of the part is very bad, and serious erosion and wear often occur, which causes significant damage to the equipment and affects the measuring accuracy of the rotor scale. This kind of problem exists in the use of equipment for a long time, and it is difficult to solve by using the conventional general repair method, the replacement cost is high, and the enterprise increases a lot of downtime, which seriously affects the normal production schedule. This problem can be solved by the excellent wear resistance and good plasticity of the technical products.

1. optimize the wind pressure set value

Usually, an initial value of the primary wind pressure setting value should be given preliminarily before the boiler is officially started. When the boiler is officially started, with the increase of unit load, the primary air volume will also increase, and the primary air duct pressure will also change. When the opening of the hot air baffle in the pulverizer system is less than 50%, the primary air pressure setting value can be reduced appropriately at this time. When the > is 80%, it is necessary to increase the wind pressure set value.

2. Adjust the burner to swing the nozzle properly

By adjusting the position of the burner nozzle, the purpose of automatic value setting is achieved. First of all, the nozzle Angle can be adjusted according to the internal flue gas temperature of the boiler. When the Angle is large, it will increase the burden of solid combustion and cause greater heat loss. However, a smaller inclination will result in a larger amount of residue accumulation, so it is necessary to find the best inclination by adhering to the principle of scientific adjustment. Secondly, the rotation rate of the burner nozzle can be adjusted to realize the synchronous operation of the air flow and avoid the uneven distribution of the air structure inside the boiler. Finally, the position of the burner nozzle can also be placed in accordance with the law of "upper group lower group upper group", so that the heat load of the main combustion area is reduced.

3. Scientific arrangement of cyclone burner

The cyclone burner is actually a new type of boiler burner, which is mainly composed of secondary air duct, primary air duct and cyclone. In order to ensure the timeliness of pulverized coal boiler combustion, the swirl burner can be optimized according to the following contents:

(1) The corresponding primary wind speed is designed for different kinds of coal to avoid the occurrence of local backflow area inside, which affects the combustion quality.

(2) The swirl intensity can be adjusted. When the swirl intensity of the swirl burner in the boiler is weakened, it will have an impact on the combustion degree, so it needs to be adjusted appropriately according to the actual situation.

4. Determine the secondary air damper setting value

When optimizing the automatic setting value, it is necessary to further determine the secondary air small damper setting value. The secondary air small damper plays an important role in pulverized coal boiler, which can effectively reduce the influence caused by the obstruction to the operation of the coal mill. When optimizing it, it can be carried out from the following two aspects:

(1) the adaptability of the burner in pulverized coal boiler can be appropriately enhanced, and the internal combustion effect can be better by using the way of circumferential wind. On the one hand, the perimeter wind can scientifically control the combustion rate of high-quality bituminous coal, so that it will not burn all the fuel prematurely, resulting in a shorter combustion time of the boiler. Therefore, if the quality of bituminous coal used in pulverized coal boilers is high, the circumferential air volume can be appropriately increased; On the other hand, the circumferential wind can reduce the concentration of pulverized coal. Therefore, for anthracite or coal with poor volatility, the circumferential air volume should be lowered to promote the development of coal combustion in the boiler to stabilize.

(2) the combustion of pulverized coal boiler needs reasonable use of auxiliary wind, which can adjust the wind direction in the boiler. When the momentum in the boiler is relatively small, it is not conducive to the smooth combustion of coal. On the contrary, the pulverized coal in the boiler will be separated from it, which affects the actual combustion quality and leads to more residue.

1. Optimization and adjustment of flue gas

Under the condition of satisfying the performance guarantee of NOx removal rate and ammonia escape rate, the SCR system is designed to have the lowest continuous operation temperature of 315℃ and the highest continuous operation temperature of 420℃. Ammonia spraying should be stopped when SCR reactor inlet is below 315℃. The pre-smoke temperature of SCR reactor was controlled to be less than 450℃.

2. Optimize and adjust the amount of ammonia injection

According to the boiler load, fuel amount, SCR inlet NO concentration and outlet NO concentration to adjust the amount of ammonia injection. Influenced by the uneven concentration distribution in the ammonia injection reaction zone and the poor characteristics of the ammonia injection valve, when the load change is relatively large, the regulator timely manually interferes with the operation of the ammonia injection valve and adjusts the adjustment range according to the operation situation of the ammonia injection valve and the NOx concentration value at the SCR reactor outlet. If the differential pressure at the SCR inlet and outlet exceeds 750Pa, the soot blowing frequency should be increased until the differential pressure is normal, otherwise ammonia spraying should be stopped.

3. Optimization and adjustment of dilution air flow

The dilution air flow rate is set according to the maximum ammonia injection amount corresponding to the denitrification efficiency, so that the ammonia volume concentration in the ammonia/air mixture is less than 5%. In the ammonia air mixer, ammonia and air should be evenly mixed and maintained at a certain pressure. The dilution air volume on each side shall not be less than 3200Nm3/h.

4. Optimization of operation mode of pulverizing system

When the unit is running normally, keep the lower pulverizing system running for a long time. The NOx concentration at the SCR inlet of the lower mill was lower than that of the upper mill. Under the condition of ensuring the normal operation of the coal mill, and the high melting point of coal ash, it is not easy to reduce the primary air pressure when the burner mouth cokes, which can effectively reduce the concentration of nitrogen oxides at the denitrification SCR inlet.

5. Adjustment and optimization of burnout air opening

In order to adapt to the load change, the opening of SOFA wind baffle should be adjusted in time to ensure that the high temperature and low oxygen in the burning area, the low temperature and rich oxygen in the burning area, and the generation of NOx should be reduced. Through the burnout air optimization adjustment test, SOFA damper opening (H layer 20%,I layer, G layer opening are in 70%) and fully closed G layer SOFA damper, fully open I, H layer SOFA damper, denitrification device spraying ammonia reduced 14.13kg/ H. When the load changes, adjust the opening of SOFA wind baffle in time according to the NOx concentration of SCR inlet.

6. Adjustment and optimization of oxygen capacity

A slightly higher oxygen content at low load is beneficial to the stability of boiler combustion, while a slightly lower oxygen content at high load is beneficial to the reduction of fan power consumption. Under the premise of ensuring the stability of boiler combustion, maintaining the appropriate oxygen amount is beneficial to reduce the generation of NOx. Oxygen content above 500MW load was maintained at about 3.0%, 400 ~500MW at about 3.5%, 350 ~450MW at 4.0%, and 300MW at about 4.5%.

7. Adjustment and optimization of soot blowing

The denitration area uses the sonic soot blower to blow soot regularly, and the steam soot blower is used as the standby. The test shows that in order to ensure the best soot blowing effect in the denitrification area, the following soot blowing operation mode is developed: 2 sonic soot blowers in the same layer are set as one group, and 2 soot blowers on both sides of the reactor are set as one group, and the soot cleaning is performed simultaneously in the group. Each group of acoustic soot blowers will sound 10s when blowing soot, and the next group will sound 40s.

8. Strictly control the quality of coal

Affected by the tight supply of coal market, the power plant takes the way of mixing and burning to reduce the cost of power generation. Most of the time, the coal source is unstable, can not meet the requirements of the design of coal. It is found through the test that the coal ash content in the furnace is high, the dust content of the flue gas is increased, and the maintenance of the same load will increase the amount of ammonia injection, which is not conducive to the control of nitrogen oxides. Therefore, the coal ash content should be strictly controlled and not exceed the design value as far as possible.

The formation mechanism of NOx

The primary air is mixed with the gas, ignited and ejected, and the secondary high-speed airflow coils the surrounding furnace gas back flow, so that the oxygen concentration in the flame combustion area is reduced, and the oxygen concentration of 2% ~ 15% is obtained, forming oxygen-poor combustion, and the production of NO is reduced.

Air passes into the combustion area twice, so that the whole combustion process is divided into two stages, avoiding excessive concentration of high temperature area, and the temperature field in the furnace is more uniform. In high temperature regenerative combustion system, smoke and air switch device is needed, thus reversing valve is the key equipment of the system if the by pass valve, the system has a pair of high temperature regenerative combustion devices will need 4 sets of switch valve, and USES the directional control valve, the system in high temperature regenerative combustion device is only need a switch valve, cost can be greatly, reduce the reversing control in general is given priority to with when reversing, but when overtemperature exhaust system must have at the same time to enforce the function of reversing reversing valve commutation time by time and temperature of master-slave control, i.e., according to the timing, but at the same time, when the regenerator flue gas temperature more than set set, The control system will automatically alarm and control the reversing valve to force reversing according to the temperature signal.

the furnace pressure control in the combustion process

In the process of periodic switching of combustion/exhaust in regenerative combustion system, the furnace pressure will also change periodically, but the change of furnace pressure will obviously lag behind the switching of combustion system. The disturbance to the control system during periodic reversing is the difference between regenerative furnace and conventional furnace. But due to the interference is foreseeable interference, control system in the automatic control mode, the system can be used "shock" the method of interference filter system, to stabilize the combustion and to prevent the cold wind, absorption system should be set inside the furnace pressure in the 0 to 50 pa micro positive pressure condition, the computer system should be able to control the adjustment of the machine top butterfly valve opening automatically track the set value, guarantee within the scope of furnace pressure has been set.

1.Before the installation of oil-gas boilers, relevant units should determine safe and reliable gas supply methods in accordance with national standards or industrial standards such as GB50028 "Urban Gas Design Code". The pressure vessels, pressure pipes and gas cylinders used in the gas supply system should meet the requirements of relevant safety technical specifications and standards for special equipment.

2.The configuration of the burner must meet the technical requirements of the burner configuration specified in the technical data of the boiler factory. 3. Burners shall meet the requirements of safety technical specifications and standards such as Boiler Safety Technical Supervision Regulations, and oil and gas burners shall pass type tests.

3.The boiler user shall not modify and unlist the operation control program of the burner without permission.

4.The boiler user shall conduct daily inspection of the burner, boiler safety accessories and safety interlocking devices in accordance with the requirements of relevant safety technical specifications for boilers, and make inspection records.

5.When the burner needs to be repaired, the boiler user shall ask the manufacturer of the burner or its authorized unit to do so. 7. After the completion of the installation of new boilers, the system commissioning shall be completed jointly by the boiler user and the boiler erection unit or the boiler manufacturing enterprise. During the commissioning, boiler operators with corresponding qualifications shall carry out the boiler operation.

6.The technical personnel of the boiler manufacturing unit or its authorized unit shall provide on-site guidance when the burner is to be debuged6. The technical personnel of the boiler manufacturing unit or its authorized unit shall provide on-site guidance when the burner is to be debuged7.

7.During the commissioning of the boiler system and burner, the safety management organization of the boiler user unit shall ensure that irrelevant personnel shall not gather near the boiler.

8.The transformation and replacement of the burner shall follow the relevant construction notification procedures in accordance with the provisions of the boiler repair. The burner manufacturer or its authorized unit shall be responsible for the transformation, replacement and commissioning of the boiler burner, and the boiler user shall cooperate with the work. After the transformation and replacement of the burner, the user shall conduct self-inspection of the safety accessories such as the boiler safety valve and safety interlock protection device, and form self-inspection records.

9.Any transformation, repair and replacement of the burner shall not reduce the safety performance and energy efficiency index of the boiler and shall meet the environmental protection requirements.

10.Please read the attached technical data carefully before commissioning, ignition and use of boilers and burners, and carry out the work in strict accordance with the operating procedures.

11.When the burner is working, abnormal movement, abnormal sound or other abnormal conditions, it should stop running in time, find the reason, and continue to use after troubleshooting.