Efficient supercritical carbon dioxide boiler with double working media

Abstract

The invention discloses an efficient supercritical carbon dioxide boiler with double working media. The efficient supercritical carbon dioxide boiler comprises a hearth, a horizontal flue and a tail vertical flue. A flue gas outlet of the hearth communicates with the horizontal flue and the tail vertical flue, a gas cooling wall is arranged in the hearth, and a platen CO2 superheater, a high-temperature CO2 superheater and a high-temperature CO2 reheater are sequentially arranged in the horizontal flue in the flue gas flowing direction. A low-temperature CO2 reheater, a low-temperature CO2 superheater, a superheater, a water cooling wall and an economizer are sequentially arranged in the tail vertical flue from top to bottom. Working media flowing in the gas cooling wall, the low-temperature CO2 superheater, the platen CO2 superheater, the high-temperature CO2 superheater, the low-temperature CO2 reheater and the high-temperature CO2 reheater are carbon dioxide, working media flowing in the economizer and the water cooling wall are water, and media flowing in the superheater are water vapor. According to the boiler, the defects that the temperature of a supercritical CO2 working medium is high, and heat of tail low-temperature flue gas is difficult to absorb can be overcome.

Description

technical field [0001] The invention belongs to the technical field of thermal power plant boilers, and relates to a high-efficiency supercritical carbon dioxide boiler with a duplex. Background technique [0002] The power generation process of modern coal-fired power plants is based on the steam Rankine cycle. The Rankine cycle is the simplest steam power cycle, which consists of four main devices: water pump, boiler, steam turbine and condenser. The water is compressed and boosted in the water pump; then it enters the boiler to be heated and vaporized until it becomes superheated steam, then enters the steam turbine to expand and do work (to drive the generator to generate electricity), and the low-pressure steam after work enters the condenser, where it is cooled and condensed into water . Get back in the water pump again, thereby complete a working cycle. [0003] Supercritical carbon dioxide (S-CO 2 ) power generation system is a CO in a supercritical state 2 The ...

AI Technical Summary

Problems solved by technology

The low-temperature flue gas in the tail flue cannot be absorbed, and the heat contained in it can only be discharged into the atmosphere

This will inevitably bring huge exhaust loss and seriously reduce the thermal efficiency of the boiler

[0007] How to overcome supercritical CO 2 The temperature of the working fluid is high, and the difficulty in absorbing the heat of the low-temperature flue gas at the tail is a problem that must be considered in the design of a supercritical carbon dioxide boiler with practical prospects.

Images