Marine diesel engine compressed air supply soot blower and tail gas treatment system

A marine diesel engine and compressed air technology, applied in exhaust gas treatment, gas treatment, exhaust devices, etc., can solve the problems of low soot blowing intensity of sonic soot blower, accelerated catalyst deactivation, and soot deposition and adhesion, etc., to achieve Good atomization effect, prolong service life and save operating cost

Pending Publication Date: 2020-11-03
中国船舶重工集团柴油机有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The soot blowing strength of the sonic soot blower is not high, and it has little effect on the slagging and viscous ash accumulation. It is not suitable for soot blowing of catalysts with small and medium pore diameters, and the effect is unstable. Causes the deposition and attachment of soot and accelerates catalyst deactivation

Method used

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  • Marine diesel engine compressed air supply soot blower and tail gas treatment system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a typical implementation of the present disclosure, such as figure 1 As shown, a marine diesel engine compressed air supply soot blowing device is proposed.

[0031] It includes an air supply mechanism, an atomization mechanism and a dust removal mechanism. The atomization mechanism includes a urea purge module and an atomization module that are respectively connected to the gas supply mechanism through pipelines. The dust removal mechanism includes a sealing module that is respectively connected to the gas supply mechanism through pipelines. And the soot blowing pipe arranged in the reactor, the sealing module is used to output the air flow to block the counterflow of exhaust gas in the reactor, the soot blowing nozzle is arranged on the soot blowing pipe group, and it is arranged upstream of the corresponding catalyst; the ventilation mechanism includes a pipeline connected Ventilation modules of the air supply mechanism;

[0032] In this embodiment, the air suppl...

Embodiment 2

[0055] In another typical implementation of the present disclosure, such as figure 1 As shown, a ship exhaust gas treatment system is proposed.

[0056] The soot blowing device was supplied with compressed air from a marine diesel engine as described in Example 1.

[0057] The reactor is connected to the diesel engine exhaust pipe through the pipeline, the output end of the urea spray gun is connected to the mixer, the atomization module of the atomization mechanism is connected to the urea spray gun, the soot blowing pipe is arranged in the reactor, and the sealing module cooperates with the reactor to seal piping;

[0058] The reactor is equipped with a differential pressure sensor, and the test ends of the differential pressure sensor are respectively arranged at the inlet and outlet of the reactor;

[0059] There are multiple layers of catalysts arranged in the reactor along the flow direction of the flue gas, and the upstream of each layer of catalysts is equipped with ...

Embodiment 3

[0063] In yet another typical embodiment of the present disclosure, a working method of the ship exhaust gas treatment system as described in Embodiment 2 is provided.

[0064] combine figure 1 , to describe the working process of the exhaust gas treatment system in detail:

[0065] In the initial state, all valves are closed.

[0066] In the preparation stage, open the first ball valve 1, the second ball valve 3, the fourth ball valve 6, the fourth ball valve 8, the fifth ball valve 9, the sixth ball valve 14, the seventh ball valve 16, the tenth ball valve 20, and the eleventh ball valve 24 , the twelfth ball valve 26, the thirteenth ball valve 30, and the fourteenth ball valve 34.

[0067] When the main engine is running in the non-ECA area, there is no need to run the SCR system, the bypass valve 46 is closed, the exhaust gas is discharged from the exhaust pipe, and does not enter the reactor to participate in the reaction. The fourth solenoid valve 28 is energized to wo...

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Abstract

The invention provides a marine diesel engine compressed air supply soot blower and a tail gas treatment system, and relates to the field of marine environmental protection equipment. The marine diesel engine compressed air supply soot blower comprises an air supply mechanism, an atomization mechanism, a ventilation mechanism and a soot cleaning mechanism; the atomization mechanism comprises a urea purging module and an atomization module respectively communicated with the air supply mechanism through pipelines; the soot cleaning mechanism comprises a sealing module communicated with the air supply mechanism through a pipeline and a soot blowing pipe set arranged in a reactor, the sealing module is used for outputting air flow to block waste gas in the reactor from flowing back, and soot blowing nozzles are arranged on the soot blowing pipe set and located at the upstream portion corresponding a catalyst; the ventilation mechanism comprises a ventilation module communicated with the air supply mechanism through a pipeline and can supply various compressed air needed in an SCR reaction process, soot blowing operation is carried out on the catalyst, soot deposited on the surface of the catalyst is removed, the service life of the catalyst is prolonged, the pressure of supplied air flow is controlled, the air pressure in the reactor is maintained, smoke backflow is avoided, and the denitration efficiency of the system is improved.

Description

technical field [0001] The disclosure relates to the field of marine environmental protection equipment, in particular to a marine diesel engine compressed air supply soot blowing device and an exhaust gas treatment system. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] In order to meet the emission standards, ships need to install exhaust gas treatment devices behind the exhaust pipes. At present, Selective Catalytic Reduction (SCR) system is one of the most effective measures to reduce NOx emissions in diesel engine exhaust. [0004] When using selective catalytic reduction technology to denitrify exhaust gas, first spray a reducing agent into the exhaust gas at a temperature of 170-550 ° C. The reducing agent can be pure ammonia, ammonia water or urea solution. Since urea is easy to store and transport, generally Preferred as reduci...

Claims

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Application Information

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IPC IPC(8): F01N3/28F01N3/20B01D53/94B01D53/56
CPCB01D53/9431B01D53/9495B01D2251/2062B01D2258/012F01N3/2066F01N3/28F01N2610/1453
Inventor 张光伟刘佃涛齐光骆素爽洪维华宋红卫
Owner 中国船舶重工集团柴油机有限公司
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