Non-catalyzed double-reducing-agent NOx removal method and non-catalyzed double-reducing-agent NOx removal device

A reducing agent and removal technology, which is applied in the direction of exhaust device, silencer device, exhaust treatment device, etc., can solve the problems of solid deposit blockage, high catalyst cost, exhaust odor, etc., and achieve the state of reducing agent Stable, good exhaust gas/reductant mixture, NOX removal rate improvement effect

Active Publication Date: 2021-06-01
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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  • Non-catalyzed double-reducing-agent NOx removal method and non-catalyzed double-reducing-agent NOx removal device
  • Non-catalyzed double-reducing-agent NOx removal method and non-catalyzed double-reducing-agent NOx removal device
  • Non-catalyzed double-reducing-agent NOx removal method and non-catalyzed double-reducing-agent NOx removal device

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Effect test

Embodiment 1

[0060]Double reducing agent NO without cataract of the present inventionXExample of removal method with ethanol C2Hide5OH and n-pentane CH3(CH2)3CH3Or N-C5Hide12As a front spray reducing agent and the post-spray reducing agent, cooperate with auxiliary gas oxygen O2Realize NOXRemove. After the above method is applied to the oxidation catalyst (DOC), the exhaust gas treated is not high on the NOx component, NO and NO2Effective removal can be achieved in a volume ratio of 1: 9, 3: 7, 1: 1, 7: 3, 9: 1;XThe effective application temperature of the removal strategy is 100 ~ 800 ° C, the maximum temperature can be adapted to reach 800 ~ 1000 ° C, which can be covered with current NH.3The operating temperature of the -SCR system and the diesel engine, the fans of the gasoline engine post-treatment device; the present invention NOXThe best applicable system in the removal method is about 100.0 kPa, and the effective application of the total pressure is 0.5 ~ 1.5ATM. The maximum total pressu...

Embodiment 2

[0066]A non-catalytic dual reducing agent NO proposed by the present inventionXThe rear treatment device of the removal is designed as an example, such as the post-processing device design of 4 spray modules.image 3 ,Figure 4 ,Figure 5 As shown, there are four spray modules in the direction of the fluid outlet to the fluid outlet in the direction of the fluid exit to the fluid outlet direction.Figure 6As shown, it is recorded as the first stage spray module 41, the secondary spray module 42, the third-stage spray module 43 and the fourth stage spray module 43, and the tube wall of the tube body is provided in the front end of the first stage spray module 41. Pressure sensor 2 and exhaust gas-containing oxygen content sensor 5.

[0067]The structure of the four spray modules is the same, including the heating sheet 10 and the temperature sensor provided on the lumen of the tubular body 3 and four nozzles disposed on the tubular wall 4, such asFigure 5 As shown, the heating sheet 10 is p...

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Abstract

The invention discloses a non-catalyzed double-reducing-agent NOX removal method. The NOX removal is realized by taking ethanol and n-pentane as pre-spraying / post-spraying reducing agents under an oxygenation condition. An adopted aftertreatment device comprises a plurality of spray modules which are arranged on a pipe body in the flowing direction of fluid and are of the same structure, each module comprises a heating piece, a temperature sensor and four nozzles, the heating pieces and the temperature sensors are arranged in an inner cavity of the pipe body, the nozzles are arranged on the wall of the pipe body, and each heating piece is provided with an I-shaped through hole provided with a heating wire; the nozzles located on the same side of the axis of the pipe body on the wall of the pipe body are connected to an oxygen pump through oxygen pressure stabilizing rails, and the nozzles with odd numbers in the nozzles located on the other side of the axis of the pipe body on the wall of the pipe body are connected to an ethanol filtering pump through ethanol pressure stabilizing rails; the four nozzles with even numbers are connected to an n-pentane filter pump through n-pentane pressure stabilizing rails; and all the sensors, the filter pumps and the heating pieces are connected to an automobile electronic control unit. The NOX removal rate is further increased through the multi-modular design.

Description

Technical field[0001]The present invention belongs to the field of engine exhaust emissions, and involves a post-treatment strategy of nitrogen oxides in the exhaust gas of ethanol and n-fentane spray.Background technique[0002]Nitrogen oxide (NOXIs a common type of air pollutant, widely distributed in urban atmosphere, industrial process exhaust gas and combustion device exhaust gas, vehicle internal combustion engine exhaust gas is city atmosphere NOXOne of the important sources. NOXIt is a class of compounds containing only nitrogen elements and oxygen elements, including nitric oxide (NO), nitrogen dioxide (NO)2), Nitric oxide (N2O, also known as a laughter), tetra nitrogen (N2O4Dioxide nitrogen (N2O5Multi-system gaseous compounds; except NO and NO2In addition, other nitrogen oxides have poor stability, encountering light, fever, metastase and volatility to NO and NO2Therefore, all types of standard documents, including motor vehicle pollutant emission standards, and the NO in th...

Claims

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Application Information

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Patent Type & Authority Applications(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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