High sodium coal sodium-free upgrading fire coal power generation system integrating solar energy and waste-heat utilization

Abstract

The invention belongs to the technical field of high sodium coal clean combustion power generation and discloses a high sodium coal sodium-free upgrading fire coal power generation system integrating solar energy and waste-heat utilization. The system mainly comprises a coal breaker, a coal washing device, a coal liquid separation device, a sodium-free coal drying device, a waste liquor distillation device, a sodium concentrated solution recovery device, a solar energy heat collection island, a boiler, a steam turbine, a backheating water supply system and an electric generator. According to the system, high sodium raw coal and water are mixed in the coal washing device, and alkali metal in the high sodium raw coal is dissolved in the water, so that the content of the alkali metal in the raw coal is greatly reduced. Meanwhile, the solar energy serves as heat source and conducts heating distillation to coal-washing wastewater, so that the water in the coal-washing wastewater is recycled; the exhaust heat of exhaust fume of the boiler serves as the heat source and conducts drying to the sodium-free coal, so that heat value of the coal entering into the boiler is improved. According to the system, the technology is simple, the operation is safe, the problems of coking in the boiler and contamination of a heating surface of a high sodium coal power unit can be effectively solved, and it is hopeful to substantially improve the comprehensive utilization efficiency of a high sodium coal power station.

Description

technical field [0001] The invention belongs to the technical field of high-sodium coal clean combustion power generation, in particular to a high-sodium coal desodium-upgrading coal-fired power generation system integrating solar energy and waste heat utilization. Background technique [0002] High-sodium coal refers to coal with a sodium content (calculated as ash) greater than 2% in coal, and has certain reserves in China, Australia, the United States, Germany and other places. my country's high-sodium coal is mainly distributed in Zhundong, Xinjiang, and Guangxi also has a small amount of reserves. Zhundong, Xinjiang is an area rich in coal resources and reserves, with predicted reserves reaching 3.9×10 11 tons, and the current accumulated proven coal reserves are 2.136×10 11 tons, the coal-forming area of ​​the coalfield is 1.4×10 4 square meters, it is currently the largest coal field in my country. Based on my country's current annual coal production, one Zhundong...

AI Technical Summary

Problems solved by technology

However, due to insufficient research on high-sodium coal combustion, no major breakthroughs have been made in the design of high-sodium coal combustion boilers and other equipment

Blending other high-quality coal requires local power plants to purchase high-quality coal from other places, which not only increases the power generation cost of power generation companies, but also brings great difficulties to the development of Zhundong Coalfield and the construction of power bases, making Zhundong The advantages of coal are difficult to be fully utilized

In the combustion process of high-sodium coal, additives with high content of silica and alumina such as kaolin are added to make the additives react with sodium in the gas phase. Although the pollution can be reduced, the additives used in this method are solid and exist Low efficiency, greatly increased ash volume and other shortcomings, so it has not been applied on a large scale

But this control method can only slow down the contamination, and cannot fundamentally solve the problem

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