In the production process of thermal power plant, high-pressure heater (abbreviated as Gaojia) is one of the most important auxiliary equipment of steam turbine. If shutdown occurs due to high-pressure heater fault, f...In the production process of thermal power plant, high-pressure heater (abbreviated as Gaojia) is one of the most important auxiliary equipment of steam turbine. If shutdown occurs due to high-pressure heater fault, feedwater can only enter boiler through bypass pipe, which will greatly reduce feedwater temperature entering boiler, thus increasing fuel consumption, increasing power generation cost and reducing economy. When the temperature of feedwater entering the boiler is lowered, the heat absorption of water in the boiler is increased. Compared with the decrease of heat load evaporation in the furnace, the steam is heated and increased in the boiler superheater, causing the temperature of superheated steam and the temperature of the pipe wall to increase. In severe cases, the superheater may be burnt out;In addition, the shutdown of the high-pressure heater will also cause the flue gas temperature at the inlet and outlet of the air preheater to decrease, which will easily lead to the decrease of the activity of the denitration catalyst and the blockage of the heat exchange elements of the air preheater.展开更多
文摘In the production process of thermal power plant, high-pressure heater (abbreviated as Gaojia) is one of the most important auxiliary equipment of steam turbine. If shutdown occurs due to high-pressure heater fault, feedwater can only enter boiler through bypass pipe, which will greatly reduce feedwater temperature entering boiler, thus increasing fuel consumption, increasing power generation cost and reducing economy. When the temperature of feedwater entering the boiler is lowered, the heat absorption of water in the boiler is increased. Compared with the decrease of heat load evaporation in the furnace, the steam is heated and increased in the boiler superheater, causing the temperature of superheated steam and the temperature of the pipe wall to increase. In severe cases, the superheater may be burnt out;In addition, the shutdown of the high-pressure heater will also cause the flue gas temperature at the inlet and outlet of the air preheater to decrease, which will easily lead to the decrease of the activity of the denitration catalyst and the blockage of the heat exchange elements of the air preheater.
