The burner can't jet flame, which can be roughly divided into the following three situations:
(a) Arc without ignition
(b) The electromagnetic valve cannot output fuel gas
(c) The output fuel gas cannot be ignited due to incorrect adjustment or abnormal ignition arc.
(a) The control box may be faulty (damaged)
(b) The air pressure switch does not act, the air pressure switch is damaged, and the contact of the gas burner cannot act when the air pressure reaches the set value. The air pressure port or piezometer is blocked. Check whether the set value of the air pressure switch is set correctly, and the fan failure causes the air pressure to be too low.
(a) It may be a voltage problem. Because the programmer has a low voltage protection function, the burner stops running when the input voltage is below 160 V (whichever the normal input voltage is 220-240 V). Later, when the voltage returns to normal, the burner starts again by itself.
(b) It may also be due to the insufficient supply pressure of the gas. When the burner starts to emit the flame, the pressure drops sharply, and the burner stops running when falling below the set point on the gas low-pressure switch. When the burner is stopped, the gas pressure rises, and when it rises above the set value on the low gas voltage switch, the burner restarts by itself. The reason for the sharp drop in gas may be the small caliber of the gas supply pipeline. If the fuel is LPG but supplied by the cylinder, note the number of cylinders connected. If the change of gas pressure is quite large, be particularly careful when adjusting the pressure on the gas low pressure switch.
(c) Please check whether the pressure adjusted on the gas low-pressure switch is incorrect.
The damper air volume setting of the big flame is too high.
The microswitch of the oil valve of the big flame (the group outside the damper) is set inappropriately (the setting is higher than the air volume of the damper of the big flame).
Oil viscosity is too high to be atomized (heavy oil).
Improper spacing between cyclone disc and oil nozzle.
The big flame oil nozzle is worn or dirty.
The heating temperature of the reserve tank is too high, which causes the steam to make the oil pumping not smooth.
The oil in the oil-fired boiler contains water.
Gradually reduce the flame; raise the heating temperature; adjust the distance (between 0 and 10 mm); clean or replace; set the temperature at about 50℃. change oil or drain water.
Five possible solutions: clearing, replacing, adjusting distance, changing cables or change transformers.
The working process of the flame detection device is as follows: the flame detection device near the ignition oil gun is composed of optical fiber, which senses the fire and generates optical signal. The optical signal is transmitted to the signal amplification circuit of the ignition program-controlled cabinet, which is amplified into electrical signal, and the switch value is transmitted to the display screen of the distributed control system (DCS), so that the operator can know the working condition of the ignition oil gun.
The boiler boosting process is actually a warming process, the pressure corresponds to the saturation temperature. The saturation temperature is not directly proportional to the pressure, but with the increase of the pressure, the saturation temperature starts to increase rapidly, then becomes slower and slower. Therefore, in order to ensure that the temperature difference between the upper and lower walls of the steam drum is within the specified range, the boosting speed must be slow at the initial stage of ignition. In addition, in order to avoid the superheater burning out at the initial stage of ignition, this is also the case.
In the middle and late ignition period, the boosting speed is faster and faster, but the heating speed is basically unchanged, so the boosting speed can be accelerated, the boosting time can be shortened, and the fuel can be saved.
(1) Adequate air supply.
(2) Maintain a high enough temperature.
(3) Proper mixing of air and fuel.
(4) Sufficient burning time.
The reliability and economy of pulverized coal furnace operation depend to a great extent on burner performance and aerodynamic conditions in the furnace. Good furnace aerodynamic conditions are mainly manifested in the following three aspects.
(1) There is enough hot flue gas from the combustion center to flow back to the root of the primary air-powder mixture jet, so that the fuel can be quickly heated and ignited after being injected into the furnace, and a stable ignition front can be maintained.
(2) The distribution of fuel and air is appropriate. After the fuel catches fire, it can get sufficient air supply and achieve uniform diffusion and mixing, so as to facilitate rapid combustion.
(3) There should be good flame fullness in the furnace, and a combustion center with moderate area should be formed. This requires that the airflow in the furnace should not be skewed, and the furnace wall should not be washed, so as to avoid stagnation zone and useless vortex zone. Each burner jet should not have violent interference and collision.
The main task of combustion adjustment is to ensure the safety and economy of boiler operation while meeting the steam quantity and qualified steam quality required by external load.
1、Elemental analysis of fuel
2、Sampling and industrial analysis of incoming fuel
3、Sampling of fly ash and slag,measurement of combustible content
5、Flue gas analysis data at furnace outlet (after superheater) and smoke exhaust, etc.
Heat conduction oil furnace is a thermal energy equipment that uses coal, oil and gas as fuel and relies on thermal oil as circulating medium for heating. When oil leakage occurs in heat conduction oil furnace, the following measures can be taken in order to use heat conduction oil furnace more correctly.
In order to prevent the organic liquid from leaking and burning, the welding needs to be strictly controlled. The quality of welding and NDT must meet the requirements of technical monitoring and safety regulations for organic heat carrier furnaces.
After an oil leak from a heat conduction oil furnace, first check whether the dewatering and exhaust heating speed is too fast, thermal oil heating water to generate steam, thermal oil low boiling point volatile mixture strong influence, leading to oil leakage in the elevated tank.
Due to the different equipment used for heating temperature or oil return temperature in heat conduction oil furnace, high temperature thermal oil quickly enters the cold oil in the refrigeration system, resulting in a large amount of evaporation of low-boiling substances and sharp expansion of volume, leading to oil overflow in the high tank. After that, we should look at whether it is caused by external reasons, such as circulating pump failure, sudden power outage, system vulnerability problems interrupt the circulating heating system. Because the furnace temperature can not fall in a short time, so the temperature rises rapidly, the high boiling point material and the low boiling point material of the heat conduction oil, because the high temperature directly washes the high oil leakage.