Flue gas denitration device and denitration method

A flue gas and denitrification technology, which is applied in the flue gas denitrification device and its denitrification field, can solve the problems that it is difficult to reach the catalyst activation temperature of the SCR method, the sintering flue gas is difficult to SCR technology, and the flue gas contains corrosive gases, etc., and achieves good economy. performance, increase life, and reduce investment costs

Pending Publication Date: 2018-07-17
易能环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 3) The flue gas carries a lot of dust; the moisture content is large
[0008] 4) Flue gas contains corrosive gas
[0011] 1) The temperature of the sintering flue gas is low (<200°C), it is difficult to reach the catalyst activation temperature of the SCR method, and it is difficult to directly adopt the SCR technology for the sintering flue gas

Method used

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  • Flue gas denitration device and denitration method

Examples

Experimental program
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Effect test

Embodiment 1

[0056] A flue gas denitrification method, the specific steps are as follows:

[0057] 1) Flue gas electrostatic dust removal: the flue gas before denitrification is passed into the electrostatic precipitator 7 of the sintering machine for electrostatic dust removal, and the flue gas after dust removal is introduced into the flue 14 through the induced draft fan 8;

[0058] 2) Flue gas heat exchange and heating: the flue gas in the flue 14 enters the air heat exchanger 5 through the intake valve 15 for temperature rise and heat exchange, and the flue gas after heat exchange enters the flue heater 3 for heating. The heated flue gas flows in the intake pipe and passes through the ammonia injection grid 11; the air heat exchanger 5 exchanges heat between the flue gas after denitration and the flue gas before denitration, and exchanges the temperature of the flue gas before denitration When it is heated to about 200°C, the flue heater 3 uses coke oven gas as fuel to heat the flue g...

Embodiment 2

[0064] A flue gas denitrification method, the specific steps are as follows:

[0065] 1) Flue gas electrostatic dust removal: the flue gas before denitrification is passed into the electrostatic precipitator 7 of the sintering machine for electrostatic dust removal, and the flue gas after dust removal is introduced into the flue 14 through the induced draft fan 8;

[0066] 2) Flue gas heat exchange and heating: the flue gas in the flue 14 enters the air heat exchanger 5 through the intake valve 15 for temperature rise and heat exchange, and the flue gas after heat exchange enters the flue heater 3 for heating. The heated flue gas flows in the intake pipe and passes through the ammonia injection grid 11; the air heat exchanger 5 exchanges heat between the flue gas after denitration and the flue gas before denitration, and exchanges the temperature of the flue gas before denitration When it is heated to 250°C, the flue heater 3 uses coke oven gas as fuel to heat the flue gas to ...

Embodiment 3

[0072] A flue gas denitrification method, the specific steps are as follows:

[0073] 1) Flue gas electrostatic dust removal: the flue gas before denitrification is passed into the electrostatic precipitator 7 of the sintering machine for electrostatic dust removal, and the flue gas after dust removal is introduced into the flue 14 through the induced draft fan 8;

[0074] 2) Flue gas heat exchange and heating: the flue gas in the flue 14 enters the air heat exchanger 5 through the intake valve 15 for temperature rise and heat exchange, and the flue gas after heat exchange enters the flue heater 3 for heating. The heated flue gas flows in the intake pipe and passes through the ammonia injection grid 11; the air heat exchanger 5 exchanges heat between the flue gas after denitration and the flue gas before denitration, and exchanges the temperature of the flue gas before denitration When it is heated to 225°C, the flue heater 3 uses coke oven gas as fuel to heat the flue gas to ...

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Abstract

The invention discloses a flue gas denitration device. The method mainly comprises a smoke dust introducing device, a flue, an air heat exchanger, a flue gas mixing pipeline, a selective catalytic reduction (SCR) reactor and a chimney; an air inlet pipeline and an air exhaust pipeline are arranged on the flue; the air heat exchanger is arranged between the air inlet pipeline and the air exhaust pipeline; the air inlet pipeline and the air exhaust pipeline between the air heat exchanger and the flue are respectively provided with an air inlet valve and an air exhaust valve; a bypass valve is arranged on the flue between the air inlet pipeline and the air exhaust pipeline; and the air inlet pipeline above the air heat exchanger is sequentially provided with a flue heater and an ammonia spraying grid. According to invention, the SCR reactor is arranged behind an electrostatic precipitator of a sintering machine, so that the scouring and abrasion of dust on a catalyst are reduced, the service life of the catalyst is improved; flue gas entering the air heat exchanger before denitration is preheated by the air heat exchanger, so that the thermal efficiency of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, and in particular relates to a flue gas denitrification device and a denitrification method thereof. Background technique [0002] The iron and steel industry is an important part of my country's industry. A large amount of air pollutants are produced in the production process. The NO emitted by various equipment in the iron and steel plant X The total amount occupies the second place in the fixed generation. Sintering machine is one of the most important process units in modern steel production, NO X Emissions account for about X 48% of the total emission, sintering flue gas NO X Emissions account for about NO X 10% of total emissions. [0003] With the increasing environmental protection requirements in our country, for iron and steel enterprises, the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/86B01D53/56B03C3/017
CPCB01D53/8631B01D53/90B03C3/017B01D2258/0283
Inventor 程国际刘志勇陈光严青尹道三
Owner 易能环境技术有限公司
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