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Oxygen-enriched combustion W-shaped flame boiler system and combustion process thereof

A technology of oxygen-enriched combustion and combustion method, which is applied in the field of boiler combustion, can solve the problems of failure to consider collection, emission reduction, insufficient research, etc., and achieve the effects of improving ignition conditions, increasing efficiency, and reducing the possibility of slagging

Active Publication Date: 2015-04-08
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, although a lot of scientific research and experiments have been carried out on oxygen-enriched combustion technology, most of the relevant researches are on conventional coal such as bituminous coal, while the research on the combustion of anthracite or low-volatile coal by oxygen-enriched technology is limited. very inadequate
As the main unit for burning anthracite or low volatile coal, the W flame boiler still fails to consider CO 2 collection and emission reduction

Method used

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  • Oxygen-enriched combustion W-shaped flame boiler system and combustion process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] figure 1 It is a schematic diagram of an oxygen-enriched combustion W flame boiler system provided by the present invention. The described oxygen-enriched combustion W flame boiler system includes a W flame furnace 1, a superheater 2 is located in the top flue, and reheating furnaces are sequentially arranged in the tail flue. 3, economizer 4 and gas-gas heat exchanger 5; one end of water removal device 7 is connected to the main flue outlet of gas-gas heat exchanger 5 through dust collector 6, and the other end of water removal device 7 is connected to one end of desulfurization device 8, The other end of the water removal device 7 is connected to the input end of the recirculation flue gas of the gas-gas heat exchanger 5 through the recirculation flue gas channel; the CO 2 The recovery unit 9 is connected to the other end of the desulfurization unit 8;

[0026] Gas-gas heat exchanger 5 is also equipped with an O 2 Input side, gas-gas heat exchanger 5O 2 The export ...

Embodiment 2

[0031] The difference with embodiment 1 is:

[0032] A small amount of hygienic combustion belts are laid on the lower furnace water wall of the oxy-fuel combustion W flame boiler system.

[0033] In the combustion process of the oxygen-enriched combustion W flame boiler system, the O in the primary air 2 The volume share is 65%, and O in the furnace arch secondary air 2 The volume share is 40%, and the secondary air on the front and rear walls is recirculated flue gas; the O entering the furnace 2 The volume ratio of the recycled flue gas (volume ratio under standard conditions) is 1:1.7.

[0034] Other parts are all identical with embodiment 1.

Embodiment 3

[0036] The difference with embodiment 1 is:

[0037] A small amount of hygienic combustion belts are laid on the lower furnace water wall of the oxy-fuel combustion W flame boiler system.

[0038] In the combustion process of the oxygen-enriched combustion W flame boiler system, the O in the primary air 2 The volume share is 80%, O in the furnace arch secondary air 2 The volume share is 60%, and the secondary air on the front and rear walls is recirculated flue gas; the O entering the furnace 2 The volume ratio of the recycled flue gas (volume ratio under standard conditions) is 1:1.5.

[0039] Other parts are all identical with embodiment 1.

[0040] The oxygen-enriched combustion W flame boiler system provided by the present invention combines the oxygen-enriched combustion technology with the W flame boiler, almost no NOx gas is generated during the combustion process, and lower-cost desulfurization, denitrification and CO 2 Capture, and achieve zero emissions.

[0041...

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Abstract

The invention provides an oxygen-enriched combustion W-shaped flame boiler system and a combustion process thereof. Flue gas discharged from a dewaterer is divided into two strands, wherein one strand of flue gas sequentially enters a desulfurization device and a CO2 recovery device and the other strand of flue gas enters a gas-gas heat exchanger and is heated by flue gas in a main flue; the flue gas in the main flue also heats O2 separated in the air when heating the recycled flue gas; the heated recycled flue gas is divided into three strands; O2 is divided into two strands; after the first strand of O2 is mixed with the first strand of recycled flue gas, the mixed gas enters a coal mill and enters a primary air pipeline; after the second strand of O2 is mixed with the second strand of recycled flue gas, the mixed gas enters a furnace arch secondary air pipeline; and the third strand of recycled flue gas enters a front and rear wall secondary air pipeline The system provided by the invention overcomes the defects in the prior art and greatly improves ignition conditions of a hearth; when the radiation and heat adsorption area of a lower hearth is effectively increased, slag-bonding possibility is greatly reduced; efficiency of the integral system is improved; steel consumption and manufacturing cost of a boiler are reduced; and zero emission of CO2 can also be realized.

Description

technical field [0001] The invention relates to an oxygen-enriched combustion W flame boiler system and its combustion method, in particular to a W flame boiler system and its combustion process using pure oxygen as an oxidant and anthracite or low volatile coal as a main fuel, and belongs to the technical field of boiler combustion . Background technique [0002] Currently, CO in electricity production using coal as the main energy source 2 Emissions of CO from all human activities 2 About 25% of total emissions are CO 2 Largest single point source of emissions. CO in the exhaust gas of air-supported combustion of conventional pulverized coal boiler 2 The concentration is only 13% to 15%, which gives CO 2 The separation and capture of these materials bring great technical and economical problems. Oxygen-enriched combustion technology, also known as O 2 / CO 2 Combustion technology for organizing pulverized coal in O 2 and CO 2 Combustion in the mixed gas can greatl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C9/06F23C7/06
CPCY02E20/34
Inventor 闫凯马胜张建文乌晓江
Owner SHANGHAI BOILER WORKS
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