Novel circulating fluidized bed combined cycle

Abstract

The invention discloses a novel circulating fluidized bed combined cycle comprising a gas turbine device, a circulating fluidized bed boiler, a steam turbine device, a piping system and a bypass chimney connected with gas turbine exhaust gas and boiler first and secondary wind systems, an air piping system connected with a gas compressor intermediate-grade gas suction port and a boiler high-pressure tuyere, and a flue gas waste heat recovery oxygen-removing heating system; a tail end smoke flue of the circulating fluidized bed boiler is communicated with atmospheric air through a dust collector and a chimney, a high-temperature superheater and a high-temperature reheater of the circulating fluidized bed are respectively communicated with a high-pressure steam turbine and an intermediate-pressure steam turbine, the intermediate-pressure steam turbine is communicated with a low-pressure steam turbine, and an exhaust gas condensate of the low-pressure steam turbine is communicated with a coal economizer through a condensate water pump, low-pressure heaters, a deaerator, a pre-feawater pump, a water-feeding pump and high-pressure heaters. The combined cycle has the advantages of high thermal efficiency, less NOx emission, short starting time, low fuel consumption and station service power consumption rate, less auxiliary equipment, and remarkable energy-saving and emission-reduction effects.

Description

technical field [0001] The invention belongs to the technical field of clean coal combustion and high-efficiency utilization, and specifically relates to the system technology integration of a gas turbine and a circulating fluidized bed. Background technique [0002] For gas turbines that use air as a combustion aid, diluent and coolant for hot passage components, the oxygen content in the exhaust is about 15% (mass percentage), and the exhaust temperature is between 530-640°C. Usually, the heat of the exhaust gas is converted into heat energy of steam in the waste heat boiler to drive the steam turbine to do work. However, limited by the exhaust temperature and exhaust volume, it is difficult for the initial steam parameters to reach high parameters or supercritical parameters to achieve large-scale and high-efficiency; while the characteristics of combustion and heat load distribution in the circulating fluidized bed furnace make the circulating fluidized Bed boilers are ...

AI Technical Summary

Problems solved by technology

Due to the large heat capacity of the bed material and other heat carriers in the furnace, a large amount of fuel oil is required to heat the bed temperature to the coal input temperature, and it takes a long time

In addition, when the calorific value of coal suddenly deteriorates under low-load operation, it is necessary to consume fuel to stabilize combustion

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