Tail gas treatment device suitable for land natural gas generator set

Abstract

The utility model discloses a tail gas treatment device suitable for a land natural gas generator set, relates to an engine post-treatment system, and solves the technical problems that a traditional tail gas treatment device is too large in occupied space and limited in matched space. The device comprises a mixing pipe and a reaction chamber, a gas outlet of the mixing pipe is connected with a gas inlet of the reaction chamber, a gas inlet of the mixing pipe is connected with a tail gas exhaust port of the generator set, the mixing pipe is communicated with the reaction chamber, and a turbulent flow structure with uniformly distributed gas flow is installed in the mixing pipe. And a plurality of catalysts are integrated in the reaction chamber. According to the utility model, the SCR and DOC integrated reaction chamber is arranged, so that the space utilization rate is improved, the matching space is reduced, the packaging cost is reduced, and the market competitiveness is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an engine post-processing system, more specifically, it relates to a tail gas treatment device suitable for land natural gas generator set. BACKGROUND

[0002] The original natural gas generator emits 1894mg / Nm of NOx 3 ; and emits 695mg / Nm of CO 3 ; it needs to reach 450mg / Nm of NOx emission 3 ; and 300mg / Nm of CO emission 3 ; it needs to be equipped with DOC (oxidation catalyst) and SCR (reduction catalyst); DOC is used to catalyze and oxidize carbon monoxide (CO) and hydrocarbons (HC), thereby reducing the toxicity of tail gas, and SCR converts nitrogen oxides (NOx) into harmless substances with the help of reducing agent, achieving efficient removal of NOx. Therefore, it is necessary to equip DOC and SCR at the same time.

[0003] The existing traditional combined scheme is DOC+SCR+ASC scheme, which is relatively traditional, only needs to ensure that the volume of the catalyst carrier is sufficient, and can realize the target emission requirement, but its shortcomings are that the occupied space is too large (the cross-sectional area is 1070mmx1070mm, the length is 1200mm (DOC reaction chamber) + 2500mm (mixing pipe) + 1600mm (SCR reaction chamber), and the total length is 5300mm), the matching space is limited, and the packaging cost is also increased simultaneously, and the market competitiveness is low. INVENTION CONTENTS

[0004] The utility model solves the technical problem of the prior art, provides a tail gas treatment device suitable for land natural gas generator set, and solves the technical characteristics of the large occupied space and the limited matching space of the traditional tail gas treatment device.

[0005] The tail gas treatment device suitable for land natural gas generator set, the device comprises a mixing pipe and a reaction chamber, the gas outlet of the mixing pipe is connected with the gas inlet of the reaction chamber, the gas inlet of the mixing pipe is connected with the tail gas discharge port of the generator set, the mixing pipe and the reaction chamber are communicated, the inside of the mixing pipe is provided with a turbulence structure, and a plurality of catalytic layers are integrated in the reaction chamber.

[0006] The turbulence structure comprises a first turbulence unit, a second turbulence unit and a third turbulence unit, the first turbulence unit is installed inside the mixing pipe and close to the gas inlet of the mixing pipe, the third turbulence unit is installed inside the mixing pipe and close to the gas outlet of the mixing pipe, and the second turbulence unit is installed between the first turbulence unit and the third turbulence unit inside the mixing pipe.

[0007] Further improvement, the primary turbulence unit includes a first mounting flange, two first fixed rods and two first turbulence plates, the first mounting flange is fixedly installed inside the mixing pipe, both ends of the two first fixed rods are fixedly installed on the inner wall of the first mounting flange, the two first fixed rods are arranged in parallel, both ends of the bottom of the two first turbulence plates are fixedly installed on the inner wall of the first mounting flange, the top of one of the first turbulence plates is fixedly connected with the top of the other first turbulence plate, and the two first fixed rods penetrate the two first turbulence plates.

[0008] Further, the secondary turbulence unit and the tertiary turbulence unit are consistent in structure, and each includes a second mounting flange, two second turbulence plates and two second fixed rods, the second mounting flange is fixedly installed inside the mixing pipe, both ends of the bottom of the two second turbulence plates are fixedly installed on the inner wall of the second mounting flange, the top of the two second turbulence plates is fixedly connected with the second fixed rod, the two second fixed rods are arranged in parallel, both ends of the two second fixed rods are fixedly connected with a side plate, the side plate away from the second fixed rod is fixedly connected with the second turbulence plate through a third fixed rod, and the side plate close to the inner wall of the second mounting flange is extended and fixedly connected with the inner wall of the second mounting flange.

[0009] Further, the reactor is installed inside the reaction chamber, the gas inlet of the reactor is connected with the gas inlet of the reaction chamber through a compensator, the gas outlet of the reactor is connected with the gas outlet of the reaction chamber through a compensator, the gas inlet of the reactor is communicated with the gas inlet of the reaction chamber, and the gas outlet of the reactor is communicated with the gas outlet of the reaction chamber.

[0010] The first catalytic layer is installed inside the reactor close to the gas inlet of the reactor, the third catalytic layer is installed inside the reactor close to the gas outlet of the reactor, and the second catalytic layer is installed inside the reactor between the first catalytic layer and the third catalytic layer.

[0011] Further, the first catalytic layer and the second catalytic layer are provided with SCR, and the third catalytic layer is provided with DOC.

[0012] Further, the control cabinet is installed outside the reaction chamber.

[0013] Further, the length of the mixing pipe is 2500-2700mm, and the length of the reaction chamber is 2030mm-2050mm.

[0014] Beneficial effects

[0015] The utility model discloses the advantages are:

[0016] 1. This utility model is equipped with a mixing pipe and a reaction chamber. The outlet of the mixing pipe is connected to the inlet of the reaction chamber, and the inlet of the mixing pipe is connected to the exhaust outlet of the generator set. The mixing pipe is connected to the reaction chamber. The mixing pipe has a turbulence structure inside. The reaction chamber contains multiple catalysts. The reaction chamber integrates SCR and DOC, which can improve space utilization, reduce supporting space, thereby reducing packaging costs and improving market competitiveness.

[0017] 2. This utility model improves catalytic efficiency by setting a turbulence structure to make the exhaust gas entering the reaction chamber flow evenly across the catalyst surface. In addition, the uniform airflow distribution can reduce problems such as local overheating and catalyst aging, and extend the service life of the reaction chamber. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the exhaust gas treatment device of this utility model;

[0019] Figure 2 This is a cross-sectional view of the mixing tube of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the first-stage turbulence unit of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the secondary and tertiary turbulence units of this utility model;

[0022] Figure 5 This is a structural diagram of the internal structure of the reaction chamber of this utility model.

[0023] Wherein: 1-mixing pipe, 2-reaction chamber, 3-first-stage turbulence unit, 301-first mounting flange, 302-first fixing rod, 303-first turbulence plate, 304-first through hole, 4-second-stage turbulence unit, 401-second mounting flange, 402-second turbulence plate, 403-second fixing rod, 404-second through hole, 405-third fixing rod, 406-side plate, 5-third-stage turbulence unit, 6-NOx sensor, 7-nozzle, 8-protective layer, 9-first catalytic layer, 10-second catalytic layer, 11-third catalytic layer, 12-temperature sensor, 13-compensator, 14-differential pressure sensor, 15-control cabinet, 16-reactor. Detailed Implementation

[0024] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0025] See Figures 1-5The utility model discloses a kind of exhaust treatment devices suitable for land natural gas generator set, the device includes mixing pipe 1 and reaction chamber 2, the gas outlet of mixing pipe 1 is connected with the gas inlet of reaction chamber 2, the gas inlet of mixing pipe 1 is connected with the exhaust port of generator set, mixing pipe 1 is communicated with reaction chamber 2, the inside of mixing pipe 1 is installed with the turbulence structure that makes airflow uniform distribution, multiple catalytic layers are integrated in reaction chamber 2.

[0026] The turbulence structure includes primary turbulence unit 3, secondary turbulence unit 4 and tertiary turbulence unit 5, the primary turbulence unit 3 is installed inside mixing pipe 1 close to the gas inlet of mixing pipe 1, the tertiary turbulence unit 5 is installed inside mixing pipe 1 close to the gas outlet of mixing pipe 1, and the secondary turbulence unit 4 is installed between the primary turbulence unit 3 and the tertiary turbulence unit 4 inside mixing pipe 1.

[0027] The primary turbulence unit 3 includes first mounting flange 301, two first fixed rods 302 and two first turbulence plates 303, the inside of mixing pipe 1 is provided with mounting flange, a plurality of first through holes 304 are formed in the first mounting flange 301, and the first mounting flange 301 is fixedly installed on the mounting flange inside mixing pipe 1.

[0028] The two ends of the two first fixed rods 302 are fixedly installed on the inner wall of the first mounting flange 301, the two first fixed rods 302 are arranged in parallel, the two ends of the bottom of the two first turbulence plates 303 are fixedly installed on the inner wall of the first mounting flange 301, the top of one of the two first turbulence plates 303 is fixedly connected with the top of the other first turbulence plate 303, and the two first fixed rods 302 penetrate the two first turbulence plates 303.

[0029] The secondary turbulence unit 4 and the tertiary turbulence unit 5 are identical in structure, and each includes second mounting flange 401, two second turbulence plates 402 and two second fixed rods 403.

[0030] The two ends of the bottom of the two second turbulence plates 402 are fixedly installed on the inner wall of the second mounting flange 401, the top of the two second turbulence plates 402 is fixedly connected with the second fixed rod 403, the two second fixed rods 403 are arranged in parallel, the two ends of the two second fixed rods 403 are fixedly connected with side plates 406, the side plates 406 are fixedly connected with the second turbulence plates 402 through third fixed rods 405 away from the second fixed rod 403, and the side plates 406 are fixedly connected with the inner wall of the second mounting flange 401 on the side close to the second mounting flange 401.

[0031] The first and second turbulence units 3 and 4 are arranged to achieve uniform distribution of the gas flow in the reaction chamber 2. By reasonably designing the shape, size and layout of the flow channel, the exhaust gas entering the reaction chamber 2 can uniformly flow through the catalyst surface, improving the catalytic efficiency. In addition, uniform gas flow distribution can also reduce local overheating and catalyst aging problems, prolonging the service life of the reaction chamber 2.

[0032] A NOx sensor 6 and a nozzle 7 are installed at the gas inlet of the mixing pipe 1, and a protective layer 8 is provided on the outside of the mixing pipe 1. The NOx sensor 6 is used to obtain the concentration of nitrogen oxides.

[0033] A reactor 16 is installed inside the reaction chamber 2. The gas inlet of the reactor 16 is connected to the gas inlet of the reaction chamber 2 through a compensator 13, and the gas outlet of the reactor 16 is connected to the gas outlet of the reaction chamber 2 through a compensator 13. The gas inlet of the reactor 16 is in communication with the gas inlet of the reaction chamber 2, and the gas outlet of the reactor 16 is in communication with the gas outlet of the reaction chamber 2. The compensator 13 is a device used to solve the displacement and deformation problems caused by temperature changes, mechanical vibrations and other factors in the pipeline system. It absorbs the displacement and deformation of the pipeline or component caused by temperature, vibration and other factors through its unique structure and material, thereby ensuring the normal operation of the overall pipeline system

[0034] A first catalytic layer 9 is installed inside the reactor 16 near the gas inlet of the reactor 2, and a third catalytic layer 11 is installed inside the reactor 2 near the gas outlet of the reactor 2. A second catalytic layer 10 is installed between the first and third catalytic layers 9 and 11.

[0035] SCR is used in the first and second catalytic layers 9 and 10, and DOC is used in the third catalytic layer 11.

[0036] To improve catalytic efficiency, ceramic, cordierite, and full-length precious metal catalysts are used; more efficient catalyst materials and optimized catalyst coating techniques are used. New catalyst materials have higher activity and selectivity, and can effectively convert harmful substances in exhaust gas at lower temperatures. At the same time, by optimizing the thickness and distribution of the catalyst coating, the utilization rate and catalytic effect of the catalyst can be improved.

[0037] Temperature sensors 12 and pressure difference sensors 14 are installed at the gas inlet and outlet of the reactor 16. The temperature sensors 12 are used to obtain the temperature inside the reaction chamber 2, and the pressure difference sensors 14 are used to obtain the pressure difference inside the reaction chamber 2.

[0038] A control cabinet 15 is installed outside the reaction chamber 2. The control cabinet 15 is used to receive the temperature value output by the temperature sensor 12, the differential pressure value output by the differential pressure sensor 14, and the nitrogen oxide concentration output by the NOx sensor 6, and adjust the air intake volume according to the above data. The signal receiving and air intake volume adjustment functions of the control cabinet 15 are existing technologies, and this invention does not improve upon them.

[0039] The mixing tube 1 is 2600mm long, and the reaction chamber 2 is 2040mm long. Compared with traditional solutions, the overall length of the structural components is shorter, the space utilization rate is higher, and the supporting space is smaller, thereby reducing packaging costs and improving market competitiveness.

[0040] While ensuring catalytic efficiency, reducing power loss is another important goal in exhaust gas aftertreatment device design. By reducing flow channel resistance and optimizing the structural design of the exhaust gas aftertreatment device, pressure loss of exhaust gas within the device can be reduced, thereby increasing engine power output. Furthermore, using low heat capacity materials for the outer shell and inner core of the exhaust gas aftertreatment device can reduce heat loss and improve energy utilization efficiency.

[0041] The working principle of this utility model is as follows:

[0042] When the exhaust gas from the generator set needs to be treated, the exhaust gas from the generator set enters the mixing pipe 1 through the inlet of the mixing pipe 1. The exhaust gas entering the mixing pipe 1 passes through the first-stage turbulence unit 3, the second-stage turbulence unit 4 and the third-stage turbulence unit 5 in sequence to form a uniformly flowing exhaust gas. The uniformly flowing exhaust gas enters the reactor 16 through the inlet of the reaction chamber 2. The uniformly flowing exhaust gas passes through the first catalytic layer 9, the second catalytic layer 10 and the third catalytic layer 11 in the reactor 16 in sequence, and is finally converted into a gas with lower toxicity and nitrogen oxide removal. The gas with lower toxicity and nitrogen oxide removal is discharged through the outlet of the reaction chamber 2.

[0043] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present utility model. These modifications and improvements will not affect the effectiveness of the present utility model or the practicality of the patent.

Claims

1. An exhaust gas treatment device for a land-based natural gas generator set, comprising: The device comprises a mixing pipe (1) and a reaction chamber (2), the gas outlet of the mixing pipe (1) is connected with the gas inlet of the reaction chamber (2), the gas inlet of the mixing pipe (1) is connected with the tail gas discharge port of the generator set, the mixing pipe (1) is communicated with the reaction chamber (2), the inside of the mixing pipe (1) is provided with a turbulence structure, and a plurality of catalytic layers are integrated in the reaction chamber (2); The turbulence structure comprises a first turbulence unit (3), a second turbulence unit (4) and a third turbulence unit (5), the first turbulence unit (3) is installed inside the mixing pipe (1) and close to the gas inlet of the mixing pipe (1), the third turbulence unit (5) is installed inside the mixing pipe (1) and close to the gas outlet of the mixing pipe (1), and the second turbulence unit (4) is installed between the first turbulence unit (3) and the third turbulence unit (5) inside the mixing pipe (1).

2. The exhaust treatment device for a land-based natural gas generator set of claim 1, wherein, The first turbulence unit (3) comprises a first mounting flange (301), two first fixed rods (302) and two first turbulence plates (303), the first mounting flange (301) is fixedly installed inside the mixing pipe (1), the two ends of the two first fixed rods (302) are fixedly installed on the inner wall of the first mounting flange (301), the two first fixed rods (302) are arranged in parallel, the two ends of the bottom of the two first turbulence plates (303) are fixedly installed on the inner wall of the first mounting flange (301), the top of one of the first turbulence plates (303) is fixedly connected with the top of the other first turbulence plate (303), and the two first fixed rods (302) penetrate the two first turbulence plates (303).

3. The exhaust treatment device for a land-based natural gas generator set of claim 1, wherein, The second turbulence unit (4) and the third turbulence unit (5) are identical in structure and comprise a second mounting flange (401), two second turbulence plates (402) and two second fixed rods (403), the second mounting flange (401) is fixedly installed inside the mixing pipe (1), the two ends of the bottom of the two second turbulence plates (402) are fixedly installed on the inner wall of the second mounting flange (401), the top of the two second turbulence plates (402) is fixedly connected with the second fixed rod (403), the two second fixed rods (403) are arranged in parallel, the two ends of the two second fixed rods (403) are fixedly connected with side plates (406), one side of the side plate (406) away from the second fixed rod (403) is fixedly connected with the second turbulence plate (402) through a third fixed rod (405), and one side of the side plate (406) close to the inner wall of the second mounting flange (401) is extended and fixedly connected with the inner wall of the second mounting flange (401).

4. The exhaust treatment device for land-based natural gas generator sets of claim 1, wherein, The inside of the reaction chamber (2) is provided with a reactor (16), the gas inlet of the reactor (16) is connected with the gas inlet of the reaction chamber (2) through a compensator (13), the gas outlet of the reactor (16) is connected with the gas outlet of the reaction chamber (2) through the compensator (13), the gas inlet of the reactor (16) is communicated with the gas inlet of the reaction chamber (2), and the gas outlet of the reactor (16) is communicated with the gas outlet of the reaction chamber (2). The first catalytic layer (9) is installed inside the reactor (16) near the air inlet of the reactor (16), the third catalytic layer (11) is installed inside the reactor (16) near the air outlet of the reactor (16), and the second catalytic layer (10) is installed inside the reactor (16) between the first catalytic layer (9) and the third catalytic layer (11).

5. The exhaust treatment device for a land-based natural gas generator set of claim 4, wherein, SCR is arranged in the first catalytic layer (9) and the second catalytic layer (10), and DOC is arranged in the third catalytic layer (11).

6. The exhaust treatment device for a land-based natural gas generator set of claim 1, wherein, A control cabinet (15) is installed outside the reaction chamber (2).

7. The exhaust treatment device for a land-based natural gas generator set of claim 1, wherein, The length of the mixing pipe (1) is 2500-2700mm, and the length of the reaction chamber (2) is 2030mm-2050mm.

Images