Exploration of Overtemperature Solution of High-Temperature Superheater of Waste Incineration HRSG
In order to reasonably control the flue gas temperature at the inlet of the superheater and alleviate the high-temperature corrosion of the superheater caused by the calorific value exceeding the design value,increasing the area of the evaporator before the superheater is one of the effective technical improvement measures.Based on the heat transfer theory of the evaporator in the radiation heating area,this paper takes a 750 t/d waste incineration HRSG with a single-boiler processing scale as the research object.Under different low heating value(LHV)and boiler main steam parameters,when the calorific value of the waste into the furnace is higher than the design calorific value,the area of the evaporator that needs to be added to safely control the flue gas temperature has been calculated and verified by engineering experiments.The calculation results show that,taking a single furnace of 750 t/d and boiler parameters of 6.4 MPa/485℃as an example,as the calorific value of waste increases from the design value of 7118 kJ/kg to 8792 kJ/kg,in order to control the inlet flue gas temperature of the superheater at the same level,the evaporator area needs to be added by 476 m2.The over-temperature problem of the project was solved after the engineering technical renovation,indicating that the calculation method in this paper can predict the additional area of the evaporator according to the LHV.After the technical transformation,the operating profit of the project increased by 4.71 million yuan/a.
waste incinerationhigh temperature superheaterovertemperatureheat transfer calculationengineering technical improvement
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