Questions&Answers

The gas hot air furnace is the epitome of energy saving and cleanliness, mainly composed of the body, burner, combustion and control system, etc. In addition, it is equipped with a mixing cylinder after the furnace to make the flue gas it produces and the circulating flue gas mix to finally form the required temperature and flow.

Its body is divided into two parts, i.e. combustion chamber and mixing chamber. The front and the tail of the combustion chamber are set up with the temperature regulating air outlet (doping cold air outlet), the cyclone support is set up between the outer layer of the combustion chamber and the outer layer of the furnace body, and the mixing chamber is set up with the temperature regulating air inlet and the hot air outlet. The body also sets accessory equipment such as maintenance port, observation hole, explosion-proof port, pressure measurement and temperature measurement point.

The tempering wind enters the outer jacket of the combustion chamber tangentially from the side of the furnace body, and then enters from the front face of the combustion chamber and the holes evenly distributed on the circumference of the tail cylinder (doped with cold air holes), and mixes with the high temperature flue gas of the combustion chamber. The outer jacket of the combustion chamber can make the temperature-controlled wind flow evenly and be preheated, and at the same time play the role of gas layer insulation, to achieve the effect of thinning the lining of the furnace chamber and reducing the temperature of the outer surface of the shell.

The internal structural composition of the gas hot air furnace is required to complement each other, so that the absence of one, each part of the existence itself is its purpose and role.

(1) Stage burner

The stage burner designed according to the principle of graded combustion, so that the fuel and air mixed in sections, because the combustion deviates from the theoretical equivalent ratio, so it can reduce the generation of NOx.

(2) Self-recirculation burner

One is to use the pressure head of combustion air to suck back part of the combustion flue gas into the burner and mix with air for combustion. Due to the recirculation of flue gas, the heat capacity of combustion flue gas is large, the combustion temperature is reduced, and NOx is reduced.Another own recirculation burner is part of the flue gas directly in the burner into the recirculation, and join the combustion process, such burners have a dual effect of inhibiting nitrogen oxides and energy saving.

(3) Thick and light type burner

The principle is to make part of the fuel for over-dense combustion, another part of the fuel for over-light combustion, but the overall air volume remains the same. As both parts are burning in deviated chemical equivalent ratio, thus NOx are very low, this kind of combustion is also called deviated combustion or non-chemical equivalent combustion.

(4) Split flame burner

The principle is to divide a flame into several small flames, due to the small flame heat dissipation area, the flame temperature is lower, so that the "thermal reaction NO" is reduced. In addition, the small flame shortens the residence time of oxygen, nitrogen and other gases in the flame, which has an obvious inhibiting effect on "thermal reaction NO" and "fuel NO".

(5) Mixing promotion type burner

The flue gas residence time in the high temperature zone is one of the main factors affecting the amount of NOx generation. Improving the mixture of combustion and air can make the thickness of the flame surface thinner, and in the case of constant combustion load, the flue gas residence time in the flame surface, that is, the high temperature zone, is shortened, thus reducing the amount of NOx generation. Mixing promotion type burner is designed according to this principle.

(6) low NOx pre-combustion chamber burner

Pre-combustion chamber is a high-efficiency, low-NOx graded combustion technology developed in China in the past 10 years, pre-combustion chamber is generally composed of primary air (or secondary air) and fuel injection system, etc. The fuel and primary air are mixed quickly, and a fuel-rich mixture is formed in the primary combustion zone of the pre-combustion chamber, due to the lack of oxygen, only part of the fuel is burned, and the fuel precipitates volatile fraction in the primary flame zone with poor oxygen and low flame temperature, thus reducing the generation of NOx.

Hot air furnace as thermal power machinery, in many industries has become the electric heat source and the traditional steam power heat source of the replacement products, mainly because only the use of hot air as a medium and carrier to more greatly improve the thermal utilization rate and thermal work effect.

 The fuel of the hot air furnace is burned through the hot air furnace burner to produce high temperature gas, and the heat of the high temperature gas is transferred to the heated air with the help of the hot air furnace with enhanced heat exchange measures, and the temperature of the high temperature gas is lowered to below 250 degrees by the induced draft fan after the heat is dissipated. The air to be heated is sent into the hot air furnace through the optional blower, and the temperature rises to the rated value after heat absorption and is sent out from the hot air outlet. When the hot air temperature reaches the rated upper limit temperature, the burner will automatically stop burning or automatically turn to small flame burning; when the hot air temperature decreases to the rated lower limit temperature, the burner will re-ignite and run or turn to large flame burning, and the speed of temperature rise can be adjusted into the air valve to realize.

1.Direct type high purification gas hot air furnace

That is, the fuel is burned directly, after high purification treatment to form hot air, through direct contact with materials for heating, drying or baking. The fuel consumption of this method is about half less than steam type or other indirect heating methods, so the direct high purification hot air can be used completely without affecting the quality of the product. The fuel is a gaseous fuel such as gasoline, natural gas, or liquid gasoline.

The high temperature combustion gas produced by the combustion reaction is further contacted with the outside air, mixed to a certain temperature and then directly into the drying room or drying room, contacting, heating and evaporating with the dried material, so as to get the dried product.

2.Indirect gas hot air furnace

It is mainly applied to dry materials that are not contaminated or heat-sensitive materials with low temperature. Such as: milk powder, pharmaceutical, synthetic resin, fine chemicals, etc. The heating device is steam, heat-conducting oil, flue gas, etc. as the carrier, with a variety of forms of heat exchangers to heat the air.

The most fundamental problem of the indirect hot air furnace is the heat exchange problem. A large heat exchange area and high heat exchange rate can save the energy of the hot air furnace and extend the service life of the furnace and heat exchanger. On the contrary, the size of the heat exchange area can also be identified from the flue gas temperature, the lower the flue gas temperature, the higher the heat exchange rate and the larger the heat exchange area.

The gas generator is a reaction furnace used to make gas, water gas and semi-water gas. The furnace body is cylindrical, the shell is made of steel plate or made of brick, lined with refractory bricks, and equipped with charging equipment, blast duct and gas pipeline, etc. According to the structure can be divided into mechanical furnace, step furnace, furnace body rotating furnace and two-stage furnace, etc. According to the process can be divided into fixed-bed or fluidized-bed gas generating furnace.

The vaporizing agent mixed by air and self-produced steam enters the furnace from the bottom of the furnace blower, and a chemical reaction occurs to produce crude gas, which is output from the upper part of the gas generator, and then becomes net gas after dust removal and purification. The reaction and arrangement order of each level in the furnace are as follows.

1.dry layer

located in the entire coal layer of the uppermost layer, no chemical reaction, only play a drying role, so that the water in the coal into the furnace evaporate.

2.Dry distillation layer

below the dry layer is the dry distillation layer, the temperature is higher than the upper layer, which can make the coal dry distillation to get methane and other gas components.

3.Reduction layer

Under the dry distillation layer, the high temperature C02 and unreacted gasification agent continue to go up, in the reduction layer C02 and water vapor interact with the red-hot carbon and the reduction reaction occurs.

4.Oxidation layer

Below the reduction layer is the oxidation layer, where the fixed carbon in the coal reacts with oxygen in the air to produce carbon dioxide by oxidation, and gives off a lot of heat to keep the furnace at a high temperature, and the oxidation layer is the highest temperature in the furnace.

5.Cinder layer

This layer is located in the lowermost layer of the whole coal layer, which plays a protective role for the grate.

1、Oil and gas dual-use burner main components

Oil electric heating barrel, high pressure oil pump, wind plate, fan motor, proportional plate, high pressure point front coil, solenoid valve, gun, ignition needle, flame plate, photoelectric eye, RWF40, program controller, etc.

2、Oil and gas dual-use burner performance characteristics

(1) The basic structure of oil and gas dual-use burner is composed of multiple internal mixing gas tubes and oil guns residing in the center of the combustion chamber. The internal mixing tubes are used for gas fuel mixing in addition to fuel oil supplying primary gas, thus simplifying the whole burner to a single fuel oil burner, which can only be passed into the gas source when gas is needed.

(2) Can complete the fuel and gas of the arbitrary ratio of supplementary regulation. Oil and gas dual-use burner, is a combination of an oil burner and a gas burner. Similar to a Siamese, there is a separate center, there is also a shared center, relying on a transfer switch to change the fuel species; adjustment is similar to two burners, only need to adjust the fuel part and gas part respectively.

(3) The automatic control system can be designed according to the user's needs for a variety of control methods such as segment fire type, damper adjustment proportional type, frequency adjustment proportional type, touch screen digital control, industrial control machine frequency adjustment proportional type.

(4) Oil types: residual oil, heavy oil, light oil, crude oil; gas is natural gas, gas and other combustible gases.

(5) can be configured according to the needs of flameout protection, program ignition, leak detection, over-temperature, over-pressure protection and other functions, in addition to automatic control can also be manually operated.

Low-NOx burner is a device that integrates traditional burners with blowers, induced draft fans, inverters, control valves, and multiple circuits to provide clean energy and burner operation to provide more efficient heat to boilers, and it is widely used because of the following structural features.

(1) The burner is an integral assembly structure with compact structure.

(2) The burner motor and impeller are coaxially connected, so the operation is stable and reliable.

(3) The layout of all fuel and air regulation of the low-NOx burner is reasonable and clear, easy to operate.

(4) Through the articulated flange, the burner can be opened either left or right, which is convenient for maintenance and operation.

(5) Open the gas burner articulated flange, combustion head, flame stabilization plate, nozzles, etc. are clearly visible.

(6) Low nitrogen burners burn fully, save fuel, save manpower, can eliminate a lot of unnecessary expenses, the work that used to require two people to do, now only one can be done.

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.