FOSSIL-FUEL POWER PLANT AND FOSSIL-FUEL POWER PLANT OPERATION METHOD

摘要

A thermal power plant has an exhaust gas system, a feed-water system, a high-pressure feed-water heater provided to the feed-water system, a main economizer, a catalytic NOx removal equipment, and a sub economizer. The main economizer is provided to the secondary side of the high-pressure feed-water heater of the feed-water system and increases the temperature of the feed-water by using the residual heat of the combustion gas from the boiler. The catalytic NOx removal equipment is provided to the secondary side of the main economizer of the exhaust gas system. The exhaust gas is supplied to the catalytic NOx removal equipment at a required temperature or higher. The sub economizer is provided between the high-pressure feed-water heater and the main economizer and increases the temperature of water by using the exhaust gas on the secondary side of the NOx removal equipment.

主权项

1. A thermal power plant comprising:
a boiler configured to generate steam by increasing a temperature of feed-water by using heat obtained by combusting a fuel; an exhaust gas system configured to circulate an combustion gas, which is exhausted from the boiler after combusting the fuel, as an exhaust gas; a feed-water system configured to supply water to the boiler; a feed-water heater that is provided to the feed-water system and is configured to increase the temperature of feed-water by using extraction steam; a main economizer, which is provided to a secondary side of feed-water from feed-water heater of the feed-water system and is configured to increase the temperature of feed-water by using residual heat of the combustion gas; and a catalytic NOx removal equipment, which is provided to a secondary side of the exhaust gas from the main economizer of the exhaust gas system and the exhaust gas at a required temperature or higher is configured to be supplied to, wherein a sub economizer, which is configured to increase the temperature of feed-water by using the exhaust gas on a secondary side of the NOx removal equipment, is provided between the feed-water heater and the main economizer of the feed-water system.