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Smoke conveying device and method for injecting oxygen-enriched gas into flue

An oxygen-enriched gas and delivery device technology, which is applied in the direction of non-flammable liquid/gas delivery, combustion methods, indirect carbon dioxide emission reduction, etc., can solve the problem of unsafe and unstable dynamic pressure system, oxygen-enriched gas and flue gas in the flue Mix unevenly and other problems, to achieve the effect of stable mixing uniformity and enhanced mixing intensity

Inactive Publication Date: 2014-10-22
CHINA SHENHUA ENERGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects that the system is unsafe and unstable due to the excessive dynamic pressure of the oxygen injection port in the oxygen-enriched combustion system, and the oxygen-enriched gas is mixed unevenly with the flue gas in the flue, and provides a Method for quickly mixing oxygen-enriched gas with flue gas in the flue, stably and safely injecting it into the flue, and a device for realizing the method

Method used

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  • Smoke conveying device and method for injecting oxygen-enriched gas into flue
  • Smoke conveying device and method for injecting oxygen-enriched gas into flue
  • Smoke conveying device and method for injecting oxygen-enriched gas into flue

Examples

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Effect test

Embodiment 1

[0033] Such as figure 1 As shown, the flue gas conveying device is symmetrically provided with two oxygen injectors 2 on the side of the cylindrical flue 1, and the oxygen injector 2 includes a straight cylinder part 21 and a tapered part 22, and the tapered part 22 One end is connected to the flue 1 through a flange, and the other end is connected to the straight part 21 through welding, and the flow direction of the flue gas delivered through the flue 1 and the flow direction of the oxygen-enriched gas injected by the oxygen injector 2 are connected. The included angle α is equal to 90°, wherein the tapered portion 22 is a straight-flow circular tube, and the diameter ratio of the two ends of the tapered portion 22 is 2:1.

[0034] The oxygen-enriched gas with an oxygen content of 97% is injected into the flue at a flow rate of 35m / s through the above-mentioned device, and quickly mixed with the flue gas with a flow rate of 15m / s, and then sent into the boiler to participate...

Embodiment 2

[0036] Such as figure 2 As shown, the flue gas conveying device is symmetrically provided with two oxygen injectors 2 on the side of the cylindrical flue 1, and the oxygen injector 2 includes a straight cylinder part 21 and a tapered part 22, and the tapered part 22 One end is connected to the flue 1 through a flange, and the other end is connected to the straight part 21 through welding, and the flow direction of the flue gas delivered through the flue 1 and the flow direction of the oxygen-enriched gas injected by the oxygen injector 2 are connected. The included angle α is equal to 120°, wherein the tapered part 22 is a swirl tube, and the diameter ratio of the two ends of the tapered part 22 is 1.5:1.

[0037] The oxygen-enriched gas with an oxygen content of 96% is injected into the flue at a flow rate of 25m / s through the above-mentioned device, and quickly mixed evenly with the flue gas with a flow rate of 13m / s, and then sent into the boiler to participate in combusti...

Embodiment 3

[0039]The flue gas conveying device is that four oxygen injectors 2 are arranged symmetrically on the side of the rectangular flue 1, and the oxygen injectors 2 include a straight part 21 and a tapered part 22, and one end of the tapered part 22 is connected to the flue gas. The channel 1 is connected by a flange, and the other end is connected to the straight part 21 by welding, and the angle α between the flow direction of the flue gas delivered through the flue 1 and the flow direction of the oxygen-enriched gas injected by the oxygen injector 2 is equal to 135°, wherein, the tapered part 22 is a straight-flow circular tube, and the diameter ratio of the two ends of the tapered part 22 is 1.2:1.

[0040] The oxygen-enriched gas with an oxygen content of 95% is injected into the flue at a flow rate of 5m / s through the above-mentioned device, and quickly mixed evenly with the flue gas with a flow rate of 10m / s, and then sent into the boiler to participate in combustion, accord...

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Abstract

The invention discloses a smoke conveying device which comprises the flue (1) and oxygen injectors (2). The oxygen injectors (2) are symmetrically arranged the side portion of the flue. Each oxygen injector comprises a straight cylinder part (21) and a gradually-shrinking part (22). One ends of the gradually-shrinking parts are connected with the flue, and the other ends of the gradually-shrinking parts are connected with the straight cylinder parts. By means of the device, oxygen enriched gas is injected into the flue through the oxygen injectors symmetrically arranged, the oxygen enriched gas ejected out from the gradually-shrinking part of one oxygen injector and the oxygen enriched gas ejected out from the gradually-shrinking part of the other oxygen injector hedge in the center of the flue, the mixed intensity of enriched oxygen and smoke is improved, and the enriched oxygen and the smoke can be mixed fast, safely, stably and uniformly within a short time.

Description

technical field [0001] The invention relates to a flue gas conveying device and a method for injecting oxygen-enriched gas into a flue. Background technique [0002] In order to actively cope with the challenges brought by global warming to human survival, oxy-fuel combustion, as a major carbon capture technology for thermal power plants, has increasingly become a research hotspot at home and abroad. Oxygen-enriched combustion technology removes a large proportion of nitrogen in the air through oxygen production technology, so as to obtain high-concentration oxygen, mix high-concentration oxygen with oxygen-poor flue gas generated by the boiler, and send it to the boiler to participate in combustion, thus obtaining After the flue gas is dried and dehydrated, the concentration of carbon dioxide can reach more than 95%, which is relatively easy to achieve large-scale carbon dioxide enrichment and emission reduction. Safe and uniform mixing of oxygen-enriched gas and oxygen-de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L7/00
CPCY02E20/34
Inventor 李延兵陈寅彪廖海燕王鹏王俊黄卫军韩涛鲁国华
Owner CHINA SHENHUA ENERGY CO LTD
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