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

An oxygen-enriched combustion and flame technology, applied in the field of boiler combustion, can solve problems such as failure to consider collection, emission reduction, and insufficient research, and achieve the effects of improving ignition conditions, increasing efficiency, and reducing steel consumption and manufacturing costs.

Active Publication Date: 2013-04-03
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 c

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

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

[0026] The gas-gas heat exchanger 5 is also provided with O on the side of the recirculation flue gas input end ...

Example Embodiment

[0030] Example 2

[0031] The difference from Embodiment 1 is:

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

[0033] In the combustion process of the oxy-fuel combustion W flame boiler system, O in the primary air 2 The volume share of the furnace arch is 65%, O 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 to the recirculated flue gas (the volume ratio in the standard state) is 1:1.7.

[0034] The other parts are the same as in Example 1.

Example Embodiment

[0035] Example 3

[0036] The difference from Embodiment 1 is:

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

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

[0039] The other parts are the same as in Example 1.

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

[0041] In the present invention, O entering t...

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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 process, in particular to a W flame boiler system with pure oxygen as an oxidant and anthracite or low volatile coal as a main fuel and its combustion process, belonging 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 greatly ...

Claims

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Application Information

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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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