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A kind of non-catalyzed double reducing agent NOx removal method and its device

A reducing agent and removal technology, which is applied in the direction of exhaust device, muffler device, exhaust treatment device, etc., can solve the problems of solid deposit blockage, high catalyst cost, limited working conditions, etc., and achieve the goal of reducing agent Stable state, good exhaust gas/reductant mixture, and improved NOX removal rate

Active Publication Date: 2022-05-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problems of SCR technology such as exhaust odor, limited working conditions, high cost of catalyst, and clogging of solid deposits, it is necessary to design a SCR technology that uses light hydrocarbons or oxygenated hydrocarbons as the reduction catalyst. NO X removal strategy

Method used

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  • A kind of non-catalyzed double reducing agent NOx removal method and its device
  • A kind of non-catalyzed double reducing agent NOx removal method and its device
  • A kind of non-catalyzed double reducing agent NOx removal method and its device

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Catalyzed double reducing agent NO of the present invention X Example of removal method with ethanol C 2 h 5 OH and n-pentane CH 3 (CH 2 ) 3 CH 3 or n-C 5 h 12 As a pre-spray reducing agent and a post-spray reducing agent, with auxiliary gas oxygen O 2 Realize NO X remove. After the above method is applied to the oxidation catalyst (DOC), the treated exhaust gas does not have high requirements for NOx components, and NO and NO 2 Effective removal can be achieved under the volume ratios of 1:9, 3:7, 1:1, 7:3, and 9:1; the NO X The effective applicable temperature of the removal strategy is 100-800°C, and the maximum adaptable temperature can reach 800-1000°C, which can cover the current NH 3 -The operating temperature of the SCR system and the common temperature range of the aftertreatment device of the diesel engine and the gasoline engine; NO of the present invention X The best applicable system total pressure in the removal method is about 100.0kPa, the ef...

Embodiment 2

[0066] A kind of non-catalytic double reducing agent NO based on the present invention proposes X The removed post-processing device, taking the design of the post-processing device with 4 spray modules as an example, such as image 3 , Figure 4 , Figure 5 As shown, it includes a pipe body, and four spray modules are sequentially arranged on the pipe body along the axial direction from the fluid inlet to the fluid outlet, such as Figure 6 As shown, they are respectively denoted as the first-level spray module 41, the second-level spray module 42, the third-level spray module 43 and the fourth-level spray module 43. Pressure sensor 2 and exhaust gas oxygen content sensor 5.

[0067] The structure of the four spraying modules is the same, including the heating plate 10 and the temperature sensor arranged on the inner cavity 3 of the pipe and four nozzles arranged on the wall 4 of the pipe body, such as Figure 5 As shown, the heating sheet 10 is provided with an I-shaped ...

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Abstract

The invention discloses a non-catalytic double reducing agent NO X Removal method to achieve NO with ethanol and n-pentane as pre / post-spray reductants under oxygenated conditions X remove. The post-processing device used includes a plurality of spray modules with the same structure arranged along the fluid flow direction on the pipe body. A single module includes a heating plate and a temperature sensor arranged in the inner cavity of the pipe body and four nozzles arranged on the wall of the pipe body. The heating sheet is provided with an I-shaped through hole with a heating wire installed; the nozzles on the same side of the tube axis on the tube body wall are connected to the oxygen pump through the oxygen stabilizing rail, and on the other side of the tube body axis on the tube body wall The odd-numbered nozzles in the nozzles are all connected to the ethanol filter pump through the ethanol rail; the even-numbered four nozzles are connected to the n-pentane filter pump through the n-pentane rail; each sensor, filter pump and heating sheet Both are connected to the car electronic control unit. The multi-modular design of the present invention further improves the NO X removal rate.

Description

technical field [0001] The invention belongs to the field of engine exhaust emissions, and relates to a post-treatment strategy for removing nitrogen oxides in engine exhaust by spraying ethanol and n-pentane. Background technique [0002] Nitrogen oxides (NO X ) is a common air pollutant, which is widely distributed in urban atmosphere, industrial process exhaust and combustion device exhaust. Vehicle internal combustion engine exhaust is the urban atmospheric NO X one of the important sources. NO X It is a general term for a class of compounds containing only nitrogen and oxygen, including nitric oxide (NO), nitrogen dioxide (NO 2 ), nitrous oxide (N 2 O, also known as laughing gas), dinitrogen tetroxide (N 2 o 4 ), nitrogen pentoxide (N 2 o 5 ), etc., mostly gaseous compounds; except NO and NO 2 In addition, other nitrogen oxides have poor stability and are easily converted into NO and NO when exposed to light, heat, or humidity. 2 , so all kinds of standard doc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/08F01N9/00
CPCF01N3/0842F01N9/00F01N2570/14F01N2610/03F01N2610/06Y02T10/40
Inventor 贺泳迪黄林辉王斌宋金瓯吕海燕夏然
Owner TIANJIN UNIV
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