grate dzl type coal fired steam boiler
Food factory grate dzl type coal fired steam boiler should be noted that the ignition of the details need to pay attention when the details of the food factory steam boiler steam boiler ignition 1. food plant should be checked (including related accessories, Management) in front of a fire, and water supply. Before entering the water, the drain valve must be closed. Open air valve can discharge the boiler. 2, the treated water is slowly injected into the furnace, the inlet temperature is generally not higher than the boiler 40. When the water level rises to the minimum level of the water table, the water supply valve is closed, the stabilized boiler water level, the water level drops. With particular emphasis before the fire, you should check carefully the coal port and checkpoints in order to improve compliance with strict sealing conditions. Otherwise, it should clear the debris-side sealing surface, and a good gasket insertion, to ensure that meet strict sealing purposes. Since this is a forced air burner, during operation, gas leakage is not allowed, in order to avoid accidents. 3. When food factory fire steam boilers, open the bottom stoker grate and placed on the wood. After all the checkpoints closed, ignite the lighter. After strong fuel combustion, coal began to increase. When coal burning strong, continue to increase coal, closed after a stoker, hermetically sealed, turn the blower, so that coal continues to burn. burn. Strengthen the observation of the fire, the combustion gradually to normal.
How to provide boiler thermal efficiency thermal efficiency of the grate dzl type coal fired steam boiler has the following methods: low-pressure boiler at the factory has been designed considering the problem of thermal efficiency of the boiler, the flue gas from the device or change little aspects of energy-saving possibilities, it is best to start from the energy-saving operation (here talk recovered water vapor condensation method). The current design thermal efficiency of domestic low-pressure boiler is generally 70 to 90%, generally the actual operation of the thermal efficiency of about 60 to 80%, some even below 50%, a small low pressure industry as long as the operation, maintenance properly, can meet the design thermal efficiency of manufacturers. I think the management and operation should pay attention to the following points: First, the boiler flue gas temperature monitoring. Typically the maximum exhaust heat loss is loss, it is important to good control of exhaust gas temperature, exhaust gas temperature is generally low pressure coal-fired boiler of 150 ~ 180 ℃, fuel boiler exhaust gas temperature is 210 ~ 240 ℃, so when the boiler to find out why when the exhaust temperature is too high and promptly eliminated. Coal-fired boiler flue gas temperature is too high reasons are: high furnace pressure; shorting smoke; thick soot on the heat pipe; thick scale pot like. High temperature fuel exhaust reasons are: 1 air not adjusted oil, the oil is not completely burned in the chimney the secondary combustion occurs aft; 2 soot too, the need for timely cleaning; 3 shorting smoke; 4.... thick scale; Second, controlling blowdown rate. Without restricting the general rate of industrial sewage control in 5 to 10%, in the pot of water to ensure that qualified (mainly total alkalinity and pH value), the blowdown rate as low as possible, the sewage to adhere to the "ground row, row less, are ranked "the rules. Third, the maintenance of good furnace wall insulation. The heat loss is also a relatively large heat losses, now the manufacturers in the manufacturing and design has been well thought out, so we do not need to change, we just trying to be difficult to maintain. Outer surface temperature generally does not exceed 50 ℃, it will have to find out the reasons such as too high, and remove. Boiler insulation should always be kept dry, for coal, not a long positive run, or easy to damage the coal furnace wall and gate and so on. Fourth, adjust the ratio of fuel and air volume, complete combustion of the fuel as possible. Generally do not have a small amount of wind testing instruments, we can only go by experience adjustment. For oil, the normal combustion flame was yellow-white, non-glare, flame stability, no visible smoke chimney; For coal, the normal combustion flame pale, no visible smoke chimney, basic cinder burn coal particles as even as possible. Fifth, the need for a sound water treatment. Improve water treatment and water quality testing can maximize prevent fouling and correct guidance of the sewage, but it did not do a lot of small, companies usually do not pay attention.
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Run chemical plant boiler problems that may arise is what chemical plant boiler operation possible problem is? There are two main chemical plant boiler evaporation: evaporation and rated maximum continuous evaporation. When the chemical plant boiler load is higher than the maximum continuous evaporation, it indicates the operating force or overload. The following problems may occur super-load operation: Main results are as follows: (1) due to increased fuel consumption, furnace volume heat load increases, the furnace temperature and furnace flue gas outlet temperature, resulting in the superheater and reheater the superheated steam temperature and wall temperature, and must therefore be strictly monitored and adjusted. Try not to let this time overheating. Coal furnace, furnace volume due to the increased thermal load, increasing the likelihood of slagging. (2) the flow rate of chemical evaporation apparatus system working fluid increases, the flow resistance is increased, it is not conducive to water circulation. Therefore, we should pay particular attention to the monitoring of the water cycle bad area. (3) the pressure differential between the drum and the superheater outlet flow increases as the working fluid and superheater flow resistance increases, so that the pressure of the steam drum and headers increases, the strength of these components must be considered . Space volume load (4) the steam drum, the load increases the evaporation surface, saturated with water vapor would increase, thus affecting the quality of steam. (5) chemical plant boiler safety valve Total displacement designed according to a maximum continuous evaporation. If the chemical plant boiler overload, once the sudden load shedding, the safety valve will not fully open, the steam pressure can not be reduced quickly. At this point, it is necessary to ensure the safety of the boiler by chemical vapor released into the air exhaust valve. (6) With the increase of the amount of air required for combustion and the amount of smoke produced, once sufficient air supply, the air volume is insufficient, the chemical conditions affecting the combustion boiler, increasing the likelihood of slagging; In addition, since the flue gas velocity the increase in fly ash increased the degree of wear of the heating surface. (7) during operation, the exhaust gas temperature rises, the exhaust gas heat loss; shorter residence time in the furnace the fuel, incomplete combustion heat loss of mechanical and chemical incomplete combustion to increase the heat loss, reduce the thermal efficiency of the chemical plant boilers. In summary, the excess chemical plant boiler operation have an adverse impact on the security and economic, should generally not excessive run. If the special emergency must also be strictly limited scope and excess power beyond the time required to force.