Near-zero-emission coal gasification power generation system with pollutant control and power generation method

Abstract

The invention discloses a near-zero-emission coal gasification power generation system with pollutant control and a power generation method. The system comprises a gasification furnace, a coal gas cooling tower, a dust removing device, a volatile alkali metal removing device, a desulfurizer, a water vapor conversion device, a CO2 separation device, an expander, a fuel cell, a catalysis combustor,a waste heat boiler, a turbine, a solid oxide electrolytic tank, an air separation device and a heat exchanger. The invention further discloses the power generation method of the system. Through reasonable arrangement of units, comprehensive utilization of chemical energy, electric energy and heat energy is achieved. By means of the near-zero-emission coal gasification power generation system withpollutant control and the power generation method, control over main pollutants in the coal gasification power generation system can be achieved, the purpose of near-zero emission of CO2 is achieved,multi-energy complement is achieved as well, and the comprehensive utilization efficiency of system energy reaches 65% or above.

Description

technical field [0001] The invention belongs to the technical field of coal gasification power generation, and in particular relates to a near-zero-emission coal gasification power generation system and power generation method with pollutant control. Background technique [0002] With the use of fossil energy in modern society, energy and environmental problems have become increasingly prominent, and the clean utilization of fossil energy is imminent. my country's energy structure is rich in coal, poor in gas, and low in oil. The development of clean coal utilization technologies plays a vital role in alleviating or even solving environmental problems. Coal gasification technology can effectively control the discharge of various pollutants in coal. It is the core technology for clean and efficient utilization of coal, and it is of great significance to solve energy and environmental problems. [0003] In China's energy consumption structure, coal accounts for more than 70%....

AI Technical Summary

Problems solved by technology

At present, my country has successfully developed large-scale coal gasification technology, and the Chinese patent CN201610562104.0 announced a "capable of realizing pre-combustion CO 2 capture integrated coal gasification fuel cell power generation system", which realizes most of the CO 2 capture, making the CO 2 The emission has been reduced by 75%, but there is still exhaust gas emission, and there is no control of pollutants such as trace volatile metal elements (such as Hg, Pb, As, Se, etc.)

Chinese patent CN201610888933.8 discloses a "near-zero emission coal-fired power generation system and method based on IGCC" that can reduce 90% of CO in the emission system 2 , but there is NO in the system exhaust X emission, which is not conducive to environmental protection

Images