Tail gas treatment device for marine diesel engine

Abstract

The utility model discloses a marine diesel engine tail gas treatment device. The marine diesel engine tail gas treatment device comprises a DOC-CDPF treatment module and an SCR treatment module located behind the DOC-CDPF treatment module. The DOC-CDPF treatment module comprises a DOC-CDPF treatment shell, a DOC assembly and a CDPF assembly, the DOC assembly and the CDPF assembly are arranged in the treatment shell, the DOC assembly and the CDPF assembly are sequentially arranged in the gas flow direction, a plurality of insertion holes are formed in the CDPF assembly in a scattered mode, and regeneration assemblies used for heating the CDPF assembly are arranged in the insertion holes in an inserted mode. According to the scheme, the regeneration assembly is arranged, regeneration of the CDPF assembly is carried out in cooperation with tail gas waste heat, the removal effect of blockages in a pore channel of the CDPF assembly is guaranteed, compared with single tail gas waste heat treatment, the treatment effect is better, and use safety is better guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of ship exhaust treatment, more particularly to a marine diesel engine exhaust treatment device. BACKGROUND

[0002] At present, the engine of the ship in China mainly takes diesel engine as the main, and generally takes "heavy oil" as fuel, and the combustion of the engine fuel will produce gaseous pollutants such as hydrocarbons (HC), CO and particulate matter such as carbon smoke during the loading and unloading and cruising process of the ship, which will seriously harm the atmospheric environment. The diesel engine exhaust aftertreatment device mainly consists of DOC ceramic filter element (catalytic honeycomb ceramic carrier) of oxidation catalytic type and CDPF ceramic filter element (catalytic particulate trap) coated with noble metal and unique performance molecular sieve adsorbent. DOC uses platinum (Pt), palladium (Pd) and other noble metals as catalyst, mainly reduces the content of SOF in particulate emission to reduce PM emission, and can effectively reduce HC and CO in exhaust gas.

[0003] The existing exhaust pipe of the ship using diesel as fuel generally does not have DOC and CDPF exhaust purification devices, which cannot purify the ship exhaust during use, so that the discharged exhaust pollutes fresh air and causes serious harm to people's health. Although the regeneration of CDPF can be realized by using exhaust waste heat, there is still a risk of CDPF channel blockage during use, and there is a certain safety hazard in use. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a marine diesel engine exhaust treatment device to solve the technical problems in the above background technology.

[0005] The utility model technical scheme provides a marine diesel engine exhaust treatment device, which comprises a DOC-CDPF treatment module and an SCR treatment module located behind the DOC-CDPF treatment module.

[0006] The DOC-CDPF treatment module comprises a DOC-CDPF treatment shell and a DOC component and a CDPF component arranged in the treatment shell, the DOC component and the CDPF component are sequentially arranged along the gas flow direction, a plurality of jacks are dispersedly arranged in the CDPF component, and a regeneration component for warming the CDPF component is arranged in the jacks.

[0007] In a preferred embodiment, the CDPF component comprises a treatment part one and a treatment part two, the treatment part one and the treatment part two are detachably connected, and a spacing is left between the two, and the jacks on the treatment part one and the treatment part two are correspondingly arranged.

[0008] In a preferred embodiment, the regeneration assembly comprises two groups of heating rods, and the two groups of heating rods are respectively inserted into the insertion holes in the first treatment part and the second treatment part.

[0009] In a preferred embodiment, the length of the insertion hole is adapted to the length of the first treatment part and the second treatment part, and the first treatment part and the second treatment part are respectively provided with a blocking block at the distal end.

[0010] In a preferred embodiment, the SCR treatment module comprises an SCR treatment shell, a flow guide plate located in the SCR treatment shell, and an SCR catalyst located behind the flow guide plate.

[0011] In a preferred embodiment, the SCR treatment shell and the DOC-CDPF treatment shell are connected through a pipeline.

[0012] In a preferred embodiment, the SCR catalyst, the DOC assembly and the CDPF assembly are respectively provided with a protective cushion layer.

[0013] The beneficial effects of the technical scheme of the utility model are as follows:

[0014] 1. The DOC-CDPF treatment module and the SCR treatment module are combined in the scheme, so that gaseous pollutants such as HC, CO and NOx and particulate matter such as carbon smoke emitted by a ship engine can be treated in time, and then the purified tail gas is discharged into the atmosphere; and the SCR treatment shell and the DOC-CDPF treatment shell can be flexibly connected according to the space of the ship, and the use flexibility is high.

[0015] 2. The regeneration assembly is provided in the scheme, and the CDPF assembly is regenerated by cooperating with the tail gas afterheat, so as to ensure the removal effect of the blockage in the hole of the CDPF assembly. Compared with single tail gas afterheat treatment, the treatment effect is better, and the use safety is better guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is an internal schematic diagram of the utility model,

[0017] Fig. 2 It is a whole schematic diagram of the CDPF assembly of the utility model,

[0018] Fig. 3 It is a schematic diagram of the position relationship between the CDPF assembly and the regeneration assembly of the utility model.

[0019] Explanation of reference numerals in the attached drawings: 1. DOC-CDPF processing module; 11. DOC-CDPF processing housing; 12. DOC component; 13. CDPF component; 131. Processing section one; 132. Processing section two; 133. Insertion hole; 134. Sealing block; 2. Regeneration component; 21. Heating rod; 22. Junction box; 3. SCR processing module; 31. SCR processing housing; 32. Guide plate; 33. SCR catalyst; 4. Air inlet; 5. Air outlet; 6. Protective pad. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0021] like Figs. 1-3 As shown, this utility model provides a marine diesel engine exhaust gas treatment device, including a DOC-CDPF treatment module 1 and an SCR treatment module 3 located after the DOC-CDPF treatment module 1. Exhaust gas emitted from the marine diesel engine is introduced into the DOC-CDPF treatment module 1 through the air inlet 4. The gas undergoes preliminary purification by the DOC-CDPF treatment module 1. Then, the gas is passed through a pipe connected to the outlet of the DOC-CDPF treatment module 1 into the SCR treatment module 3 for further treatment. The concentration of corresponding components is detected by a sensor at the outlet 5. After meeting the standards, the clean exhaust gas is discharged into the atmosphere.

[0022] The DOC-CDPF treatment module 1 includes a DOC-CDPF treatment housing 11 and a DOC component 12 and a CDPF component 13 disposed within the treatment housing. The DOC component 12 and the CDPF component 13 are arranged sequentially along the gas flow direction. The exhaust gas is first treated by the DOC component 12 to reduce the SOF content in particulate emissions, thereby reducing PM emissions. The CDPF component 13 is used to capture particulate matter in the exhaust gas.

[0023] The CDPF assembly 13 has several recesses 133 distributed inside, and a regeneration assembly 2 for heating the CDPF assembly 13 is inserted into each recess 133. The regeneration assembly 2 can heat the CDPF assembly 13, thereby indirectly increasing the temperature inside the channels of the CDPF assembly 13, causing the blockages inside the channels to be burned off, thus clearing the blockages inside the channels of the CDPF assembly 13, ensuring the performance of the CDPF assembly 13, and improving the safety of exhaust gas treatment.

[0024] The CDPF assembly 13 comprises a processing part one 131 and a processing part two 132, which are detachably connected and have a space between them, and the jacks 133 on the processing part one 131 and the processing part two 132 are correspondingly arranged. The space between the processing part one 131 and the processing part two 132 is used for installing the regeneration assembly 2, and at the same time, the gas can be buffered, the disturbance effect is increased, and the blockage in the hole can be easily blown out. The detachable connection of the processing part one 131 and the processing part two 132 increases the use flexibility, and when one of them is aged, it can be disassembled and replaced, and the connection mode of the two can adopt threaded connection and the like.

[0025] The regeneration assembly 2 comprises two groups of heating rods 21, which are respectively inserted into the jacks 133 in the processing part one 131 and the processing part two 132, and the terminal box 22 of the heating rod is located outside the shell. The length of the jack 133 is adapted to the length of the processing part one 131 and the processing part two 132, and the processing part one 131 and the processing part two 132 are both provided with a blocking block 134 at the end away from each other. The heating rod 21 is inserted into the corresponding jack 133, so as to heat the processing part one 131 and the processing part two 132. During the heating, the heat can flow from the gap between the two to each hole, and the heating can be completed in a short time. The setting of the regeneration assembly 2 cooperates with the tail gas afterheat to regenerate the CDPF assembly 13, so as to ensure the cleaning effect of the blockage in the hole of the CDPF assembly 13. Compared with the single tail gas afterheat treatment, the treatment effect is better, and the use safety is better guaranteed.

[0026] The exhaust gas treated by the DOC-CDPF treatment module 1 enters the SCR treatment module 3, which comprises an SCR treatment shell 31, a flow guide plate 32 in the SCR treatment shell 31, and an SCR catalyst 33 behind the flow guide plate 32. The SCR treatment shell 31 can also be provided with a urea nozzle at the front end to spray urea into the SCR treatment shell 31, and the sprayed urea is uniformly mixed with the exhaust gas through the flow guide plate 32, so that the treatment effect of the SCR catalyst 33 on the exhaust gas pollutants is better.

[0027] The SCR treatment shell 31 and the DOC-CDPF treatment shell 11 are connected by a pipeline. The connection mode is not limited to the elbow pipe mentioned above, but can also be connected by a straight pipe and the like, which is specifically designed and installed according to the space of the whole ship.

[0028] The protective pad 6 is arranged outside the SCR catalyst 33, the DOC assembly 12 and the CDPF assembly 13. The protective pad 6 plays a role of protecting the outside of the SCR catalyst 33, the DOC assembly 12 and the CDPF assembly 13, and ensures the adhesion between the protective pad 6 and the shell.

[0029] Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art and related fields without creative labor should belong to the protection scope of the present application. The structures, devices and operation methods not specifically described and explained in the present application, if not specially described and limited, are implemented according to the conventional means in the art.

Claims

1. A marine diesel engine exhaust gas treatment device, characterized by: The DOC-CDPF treatment module and the SCR treatment module are connected through a pipeline. The DOC-CDPF treatment module comprises a DOC-CDPF treatment shell, a DOC assembly and a CDPF assembly arranged in the treatment shell, the DOC assembly and the CDPF assembly are arranged in sequence along a gas flow direction, the CDPF assembly is internally and dispersedly provided with a plurality of insertion holes, and a regeneration assembly for warming up the CDPF assembly is inserted and arranged in the insertion holes. The CDPF assembly comprises a first treatment part and a second treatment part, the first treatment part and the second treatment part are detachably connected and have a spacing therebetween, and the insertion holes on the first treatment part and the second treatment part are correspondingly arranged. The regeneration assembly comprises two groups of heating rods, and the two groups of heating rods are respectively inserted into the insertion holes in the first treatment part and the second treatment part. The length of the insertion holes is adapted to the length of the first treatment part and the second treatment part, and the first treatment part and the second treatment part are both provided with a blocking block at a distal end.

2. A marine diesel engine exhaust treatment device according to claim 1, characterised in that: The SCR treatment module comprises an SCR treatment shell and a flow guide plate arranged in the SCR treatment shell, and an SCR catalyst arranged behind the flow guide plate.

3. A marine diesel engine exhaust treatment device according to claim 2, characterised in that: The SCR treatment shell and the DOC-CDPF treatment shell are connected through a pipeline.

4. A marine diesel engine exhaust treatment device according to claim 2, characterized in that: The SCR catalyst, the DOC assembly and the CDPF assembly are all externally provided with a protective cushion layer.

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