Cooperative removal method for mixed smoke CO and NOx of soot replacement heat storage type heating furnace

A collaborative removal method and heating furnace technology, applied in the field of mixed smoke CO and NOx collaborative removal of soot replacement regenerative heating furnace, can solve the problems of CO exceeding and ultra-low emission standards, double denitration system investment, and high operating costs , to achieve the effect of improving safety, stable flue gas composition and saving investment

Pending Publication Date: 2022-01-18
河北中科智源新材料技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the CO serious exceeding standard and NO x with NH 3 Unable to achieve ultra-low emission standards at the same time, and the technical problems of high investment and operating costs for double denitrification systems, the purpose of the present invention is to provide a method for synergistic removal of CO and NOx mixed smoke in a soot replacement regenerative heating furnace. The method of synergistic removal of CO and NOx mixed smoke in the replacement regenerative heating furnace extracts the replacement medium from the self-produced flue gas, and replaces the residual gas in the soot sharing pipeline with flue gas before the replacement. The residual gas in the pipeline is replaced into the furnace for combustion, thereby eliminating the problem of the fluctuation of the composition of the soot due to the release of the residual gas, and eliminating the safety problems caused by the presence of gas in the flue gas. Then the flue gas and air smoke are mixed, and then the The mixed flue gas is heated and denitrated, and finally realizes the synergistic removal of CO and NOx

Method used

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  • Cooperative removal method for mixed smoke CO and NOx of soot replacement heat storage type heating furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057]A method for synergistic removal of mixed smoke CO and NOx in a soot replacement regenerative heating furnace. N groups of openings are formed on the left and right sides of the regenerative heating furnace 1, and the left and right sides of the regenerative heating furnace 1 Regenerators (not shown in the figure) are arranged on the inside of each side, and each group of openings is an opposite air port 1-2 and a gas port 1-1, soot replacement regenerative heating furnace mixed smoke CO and The NOx synergistic removal method includes the following steps:

[0058] Select one group of openings on the left and right sides of the regenerative heating furnace 1, and the steps after selection include repeating steps ① to ④, wherein, the N groups of openings on each side of the regenerative heating furnace 1 are selected in turn (for storage One side of thermal heating furnace 1: After the first opening of this side is selected, the second opening can be selected after complet...

Embodiment 2

[0068] like figure 1 As shown, the system for realizing the synergistic removal method of CO and NOx in the soot replacement regenerative heating furnace mixed smoke in Example 1, N=2, the system includes: regenerative heating furnace 1, flue gas mixer 11, heat recovery Heat exchanger 15, air flue gas warming pipeline 16 and denitration device 13 (SCR denitration reactor);

[0069] For each group of openings: each air port 1-2 communicates with an air-smoke common pipe 27, the air-smoke common pipe 27 communicates with an air intake pipe 2, and a Air reversing valve 5, each gas port 1-1 communicates with a soot sharing pipeline 26, and the soot sharing pipeline 26 communicates with a gas inlet pipeline 3, between the soot sharing pipeline 26 and the gas inlet pipeline 3 A gas reversing valve 4 is installed, and the middle part of each soot common pipe 26 communicates with a replacement branch pipeline 6; as preferably, the air reversing valve 5 and the gas reversing valve 4 a...

Embodiment 3

[0075] The usage of the above system includes:

[0076] 1) Close the valve 21 of the replacement branch pipeline 6 on the left side of the regenerative heating furnace 1, close the valve 21 of the replacement branch pipeline 6 on the right side of the regenerative heating furnace 1, and pass the air intake pipeline 2 and the gas intake pipeline 3 Input air and gas into the air port 1-2 and the gas port 1-1 on the right side of the regenerative heating furnace 1 respectively (into the air port 1-2 on the right side of the regenerative heating furnace 1 through the air intake pipe 2 Input air, input gas in the gas port 1-1 on the right side of regenerative heating furnace 1 through gas inlet pipe 3, air and gas are input simultaneously);

[0077] Adjust the gas reversing valve 4 on the left side of the regenerative heating furnace 1 so that the soot sharing pipe 26 on the left side of the regenerative heating furnace 1 is disconnected from the gas inlet pipe 3 and the soot shari...

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Abstract

The invention discloses a cooperative removal method for mixed smoke CO and NOx of a soot replacement heat storage type heating furnace. The cooperative removal method for mixed smoke CO and NOx of the soot replacement heat storage type heating furnace comprises the steps that a replacement medium is extracted from self-produced smoke, before reversing, residual coal gas in a soot common pipeline is replaced with smoke, meanwhile, the residual coal gas in the soot common pipeline is replaced and enters a hearth for combustion, so that the problem of composition volatility of soot due to diffusion of the residual coal gas is solved, the safety problem caused by coal gas existing in the smoke is solved, then the smoke and air smoke are mixed, then the mixed smoke is heated and denitrated, and finally CO and NOx cooperative removal is achieved.

Description

technical field [0001] The invention belongs to a regenerative heating furnace for reducing CO and NO X The field of environmental protection technology for emissions, specifically relates to a method for synergistic removal of CO and NOx from mixed smoke in a regenerative heating furnace replaced by soot. Background technique [0002] Regenerative heating furnace is the most widely used heating furnace in rolling mills. The regenerative heating furnace adopts the working mode of periodic reversing combustion. During the working process, the pipeline between the lower part of the gas reversing valve and the nozzle of the gas regenerative burner is a common pipeline for gas and furnace flue gas (hereinafter referred to as "" Soot common pipe"), soot is defined as the mixture of the furnace flue gas discharged from the gas port of the regenerative heating furnace and the periodically discharged gas remaining in the soot common pipe during reversing. When the heating furnace ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00
CPCF27D17/008Y02A50/20
Inventor 王子兵张玉柱王沧张彦鹏
Owner 河北中科智源新材料技术有限公司
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