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

A combustion system and mixed fuel technology, which is applied in the field of coal powder and ammonia mixed fuel prepyrolysis combustion system, can solve the problems of reducing boiler efficiency and achieve the effect of reducing costs and stabilizing sources

Pending Publication Date: 2021-07-23
XIAN THERMAL POWER RES INST CO LTD
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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

Method used

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

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, which are explanations rather than limitations of the present invention.

[0023] Such as figure 1 As shown, a prepyrolysis combustion system of pulverized coal and ammonia mixed fuel in this embodiment includes a boiler 8, and the two-layer burners of the boiler 8 respectively communicate with the first transition flue 6 and the second transition flue 7 to communicate with the second transition flue. One pyrolysis furnace 4 and the second pyrolysis furnace 5, after the pulverized coal 1 is mixed with the primary air 2, the entrances of the first pyrolysis furnace 4 and the second pyrolysis furnace 5 are connected in two ways, and the secondary air 3 Tangentially connected to the first pyrolysis furnace 4 and the second pyrolysis furnace 5; the outlet of the liquid ammonia storage tank 9 is connected to the inlet of the liquid ammonia e...

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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...

Claims

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Application Information

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IPC IPC(8): F23C9/06F23K1/04F23L9/00
CPCF23C9/06F23K1/04F23L9/00
Inventor 张向宇陆续王志超张波向小凤徐宏杰
Owner XIAN THERMAL POWER RES INST CO LTD
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