What are the possible problems in the operation of industrial boilers in chemical plants
What are the possible problems in the operation of industrial boilers in chemical plants? There are two main types of boiler evaporation in chemical plant: rated evaporation and maximum continuous evaporation. When the boiler load in the chemical plant is higher than the continuous maximum evaporation, it means the operation external force or overload operation. The following problems may occur in superload operation: the main results are as follows:
Due to the increase of fuel consumption, the furnace volume heat load increases, and the flue gas temperature and furnace outlet temperature in the furnace increase, which leads to the increase of superheated steam temperature and tube wall temperature of superheater and reheater. Therefore, it must be strictly monitored and adjusted. Try not to overheat this time. For coal furnace, due to the increase of furnace volume heat load, the possibility of slagging in the furnace is increased. (2) the velocity of working fluid in the evaporation system of chemical plant increases and the flow resistance increases, which is not conducive to water circulation. Therefore, special attention should be paid to the monitoring of areas with poor water circulation.
The pressure difference between drum and superheater outlet increases with the increase of working fluid flow rate and flow resistance in superheater, which increases the pressure of drum and header, so the strength of these components must be considered.
The space volume load of steam drum, the increase of evaporation surface load, saturated steam and water will increase, thus affecting the quality of steam.
The total exhaust capacity of industrial boiler safety valve in chemical plant is designed according to the maximum continuous evaporation. If the industrial boiler of chemical plant is overloaded, once the load suddenly falls off, the safety valve can not be fully opened and the steam pressure can not be reduced rapidly. At this time, the safety of chemical plant industrial boilers must be guaranteed by releasing steam into empty exhaust valves.
With the increase of the amount of air needed for combustion and the amount of smoke produced, once the air supply is sufficient and the air volume is insufficient, the combustion conditions of industrial boilers in chemical plants will be affected and the possibility of slagging will be increased. In addition, due to the increase of flue gas speed, the wear degree of fly ash on the heating surface is aggravated.
(7) during operation, the exhaust temperature will rise, the exhaust heat loss will be reduced, the fuel residence time in the furnace will be shortened, the mechanical incomplete combustion heat loss and the chemical incomplete combustion heat loss will increase, and the thermal efficiency of the boiler in the chemical factory will be reduced. To sum up, excessive operation of industrial boilers in chemical plants has adverse effects on safety and economy, and should not be overrun. If it is particularly urgent, the scope of excess power and the time required to go beyond force must also be severely limited.
