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A kind of regeneration method and device of SCR denitration catalyst in diesel engine exhaust aftertreatment

A denitration catalyst and exhaust gas post-treatment technology, which is applied in catalyst regeneration/reactivation, exhaust device, physical/chemical process catalyst, etc., can solve the problems of time-consuming and missing work, fast blocking speed of catalyst pores, and difficult to blow soot removal.

Active Publication Date: 2015-11-25
浙江德净环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned blowing and washing regeneration method applied in power stations is not suitable for removing the particles accumulated on the SCR denitrification catalyst of the marine diesel engine. Adhesive and therefore not easily removed by sootblowing
[0008] The catalyst regeneration methods disclosed in the above two patents are not suitable for removing the particles accumulated on the SCR denitrification catalyst of the marine diesel engine. In conclusion, the clogging of the catalyst pores is fast, and it needs to be shut down to remove particles in a short period of a few days or a long period of 1 to 2 months. For such a situation that requires frequent regeneration, the spent catalyst is transferred to the regenerator for off-site regeneration, which is time-consuming and delayed. Obviously is not suitable

Method used

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  • A kind of regeneration method and device of SCR denitration catalyst in diesel engine exhaust aftertreatment
  • A kind of regeneration method and device of SCR denitration catalyst in diesel engine exhaust aftertreatment
  • A kind of regeneration method and device of SCR denitration catalyst in diesel engine exhaust aftertreatment

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Embodiment 1

[0036] Assuming that there are two SCR reactors 11 arranged in parallel for SCR denitrification in the diesel engine exhaust aftertreatment, a regeneration device for the SCR denitration catalyst in the diesel engine exhaust aftertreatment proposed in this embodiment is as follows: figure 1 As shown, it comprises blower fan 2, air heater 3, mixer 4, ozone generator 5 and a plurality of nozzles 6, and air heater 3 is installed in series on the diesel engine downstream exhaust manifold 19, and the air outlet of blower fan 2 is heated with the air. One port of the heating pipe in the device 3 is connected, and the air in the heating pipe in the air heater 3 is sent by the diesel engine exhaust heating fan 2 in the downstream exhaust manifold 19 of the diesel engine, and the other of the heating pipe in the air heater 3 The port is connected with an inlet of the mixer 4, and the gas outlet of the ozone generator 5 is connected with the other inlet of the mixer 4, and the hot air fr...

Embodiment 2

[0038] The difference between the regeneration device provided in this embodiment and the regeneration device provided in Embodiment 1 is that a plurality of nozzles 6 are evenly arranged on the upstream flow section of the catalyst 12 in the SCR reactor 11, and in this case, it is connected to An upstream valve 13 for preventing diesel engine exhaust from entering the SCR reactor 11 is installed on the intake pipe on the SCR reactor 11, that is, the regeneration device given in this embodiment is as follows: figure 2 As shown, it comprises blower fan 2, air heater 3, mixer 4, ozone generator 5 and a plurality of nozzles 6, and air heater 3 is installed in series on the diesel engine downstream exhaust manifold 19, and the air outlet of blower fan 2 is heated with the air. One port of the heating tube in the air heater 3 is connected, the other port of the heating tube in the air heater 3 is connected with an inlet of the mixer 4, the gas outlet of the ozone generator 5 is con...

Embodiment 3

[0040] The difference between the regeneration device provided in this embodiment and the regeneration device provided in Embodiment 1 is: since the catalyst 12 in the SCR reactor 11 is arranged in two layers, the downstream circulation of each layer of catalyst in the SCR reactor 11 A plurality of nozzles 6 are arranged on the cross-section, that is, the regeneration device given in this embodiment is such as image 3 As shown, it comprises blower fan 2, air heater 3, mixer 4, ozone generator 5 and a plurality of nozzles 6, and air heater 3 is installed in series on the diesel engine downstream exhaust manifold 19, and the air outlet of blower fan 2 is heated with the air. One port of the heating tube in the air heater 3 is connected, the other port of the heating tube in the air heater 3 is connected with an inlet of the mixer 4, the gas outlet of the ozone generator 5 is connected with the other inlet of the mixer 4, and the mixing The outlet of the mixer 4 is connected to ...

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Abstract

The invention discloses a method and a device for regenerating an SCR (Selective Catalytic Reduction) denitration catalyst applied to aftertreatment of diesel engine exhaust. According to the method and the device, an air heater is connected to an upstream exhaust manifold or a downstream exhaust manifold of a diesel engine in series, a fan feeds air to the air heater, hot air formed by heating air by the air heater is used for purging and replacing the diesel engine exhaust detained in an SCR reactor, and ozone in an ozone-air mixture formed by mixing the hot air with ozone-containing gas in an ozone generator in a mixer is used for oxidization to remove particles deposited on catalyst ducts to regenerate the catalyst in situ. As the catalyst is regenerated in situ in the SCR reactor, the catalyst does not need to be moved out of the SCR reactor during regeneration, and the process of moving the regenerated catalyst into the SCR reactor after the regeneration is also omitted, so that the SCR reactor of the diesel engine, with high speed of deposition and blockage of particles and a requirement on the frequent regeneration is facilitated. The device and the method are particularly suitable for being used in the regeneration of the marine SCR reactor.

Description

technical field [0001] The invention relates to a regeneration technology of an SCR (Selective Catalytic Reduction) denitrification catalyst, in particular to a regeneration method and device for an SCR denitrification catalyst in diesel engine exhaust aftertreatment. Background technique [0002] The main propulsion power plant of the ship usually uses a large diesel engine. Since the fuel of a large diesel engine is generally heavy oil with high sulfur content and high impurity content, the exhaust gas emitted by the ship contains a large amount of NO x , SO x and PM2.5. According to reports, SO emissions from ships in Shanghai port x , NO x PM2.5 and PM2.5 accounted for 12.0%, 9.0% and 5.3% of the city's total emission inventory; x and NO x Concentration contributions accounted for about 8.0% and 12.9%, respectively. It can be seen that the pollution caused by the exhaust gas emitted by ships to the port and coastal atmosphere cannot be ignored. Moreover, the pollut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/00B01J38/12F01N13/08
Inventor 杨国华
Owner 浙江德净环境科技有限公司