a low no x Power Plant System and Method Coupling Combustion and White Smoke Reduction

Abstract

The invention discloses a low-NOx combustion and white smoke decreasing coupling power station system and methods. The low-NOx combustion and white smoke decreasing coupling power station system comprises a high-temperature strong reducing combustion system, an air separation system, a liquid oxygen condensing system, a smoke condensate recovery system and a smoke re-heating white smoke decreasing system. Pure oxygen is obtained through an air separation device, then the pure oxygen is delivered into a main combustion area through an auxiliary wall type air spraying opening, the excessive oxygen coefficient of the main combustion area is controlled to be between 0.5 and 0.8, a high-temperature main combustion area with strong high-oxygen-concentration reducing property is created, and NOx emission is greatly reduced while the fuel combustion characteristic is improved. Cold energy of liquid oxygen is utilized, the smoke temperature before an electrostatic dust collector is lowered, the efficiency of the electrostatic dust collector is improved, moisture in the smoke is recovered through a smoke condensing system, and meanwhile white smoke decreasing is achieved. Liquid oxygen residuals are exhausted through a large-temperature-difference phase change heat exchange condensing steam turbine, circulating cooling water of a power plant is reduced or omitted, meanwhile the oxygen temperature is increased, efficient utilization of low-grade heat is achieved, and the economical and environment-friendly benefits of the power plant are improved remarkably.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, in particular to a low NO x Power plant systems and methods for coupling combustion and white smoke abatement. Background technique [0002] In China, about 30% of thermal power generation is obtained by burning low-volatile fuels such as anthracite and lean coal. At the same time, with the rapid development of the coal chemical industry, hundreds of millions of tons of coal pyrolysis semi-coke and gasification residual carbon will be produced every year, resulting in serious overcapacity. This new type of low-volatile solid product is also considered to be used in the field of power generation for large-scale combustion and utilization. However, due to the low volatile content of this type of fuel, it is very difficult to achieve clean and efficient combustion. During the burning process, there are usually difficulties in ignition and stable combustion, low burnout rate, and n...

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Problems solved by technology

[0004] The object of the present invention is to provide a low NO x A power station system and method coupled with combustion and white smoke reduction, which can realize high-efficiency combustion of low-volatile fuels in power station boilers, injecting pure oxygen through the wall-type auxiliary air nozzle combined with oxygen depth classification to form a NO x The reduced high-temperature and strong reducing atmosphere solves the problems of high nitrogen oxide emissions and poor ignition and burnout performance of low-volatile fuels, and at the same time makes full use of the cold energy of liquid oxygen obtained by the air separation unit to realize condensed water recycling and eliminate white smoke plumes Integrated power plant boiler with low NO x Combustion system and method, and injecting pure oxygen through the wall wind to form an oxidative atmosphere near the water wall of the furnace to slow down the corrosion of the water wall of the furnace

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