Pulverized coal and ammonia mixed fuel pre-pyrolysis combustion system and method

Abstract

The invention discloses a pulverized coal and ammonia mixed fuel pre-pyrolysis combustion system and method. The system comprises a boiler, each layer of combustor of the boiler communicates with a pyrolysis furnace through a transition flue, pulverized coal and primary air are mixed and then communicate with an inlet of each pyrolysis furnace in multiple paths, and secondary air tangentially communicates with each pyrolysis furnace. An outlet of a liquid ammonia storage tank communicates with a liquid ammonia inlet of an evaporator, ammonia gas at an ammonia gas outlet of the evaporator is divided into a plurality of ammonia gas branches to communicate with ammonia nozzles of transition flues after passing through an ammonia gas main pipeline, a main regulating valve is arranged on the ammonia gas main pipeline, and a regulating valve is arranged on each ammonia gas branch. The invention further discloses a working method of the system. The pulverized coal and ammonia mixed fuel pre-pyrolysis combustion system and method have the advantages of large-proportion ammonia blending combustion and low nitrogen oxide emission.

Description

technical field [0001] The invention relates to a mixed ammonia fuel power generation technology, in particular to a coal powder and ammonia mixed fuel prepyrolysis combustion system and method. Background technique [0002] At present, my country's coal-fired power generation carbon dioxide emissions are about 540 g / kWh, and there is still considerable potential for reducing carbon dioxide emissions from coal-fired boilers in thermal power plants. In order to reduce carbon emissions, thermal power plants need to change the traditional high-carbon-emission coal-fired power generation method, and achieve coal and carbon reduction by burning carbon-free fuels at the front end, such as biomass, hydrogen and ammonia and other alternative fuels. [0003] Ammonia has fuel properties, and its energy density is comparable to that of fossil fuels. Direct combustion of ammonia can reduce the energy loss in the process of cracking into hydrogen. On the other hand, ammonia is a renewab...

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Problems solved by technology

Studies have shown that increasing the proportion of ammonia mixed will reduce the efficiency of the boiler. For coal-fired boilers, the current proportion of ammonia mixed is difficult to break through 10%. To achieve a larger proportion of ammonia mixed, it is necessary to develop new combustion technology

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