CN214528877U

CN214528877U - Natural gas engine and air intake system thereof

Info

Publication number: CN214528877U
Application number: CN202023172683.9U
Authority: CN
Inventors: 杨晨; 王晓艳; 贾德民; 李雯霖
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-10-29
Anticipated expiration: 2030-12-24

Abstract

The utility model provides a natural gas engine and air intake system thereof, this air intake system include air inlet pipeline (A) that links to each other with cylinder (5) of natural gas engine, have set gradually heating device (3) and desulphurization unit (4) along the inflow direction that admits air on the air inlet pipeline, are provided with adsorbent (41) and desulfurizer (42) in the desulphurization unit. The utility model provides an air intake system can carry out high-efficient desulfurization treatment to the natural gas before the engine cylinder to avoid the life-span that the sulphur content of tail gas is too high to influence the aftertreatment catalyst.

Description

Natural gas engine and air intake system thereof

Technical Field

The utility model relates to an engine technical field especially relates to a natural gas engine and air intake system thereof.

Background

In recent years, the problem of energy shortage is troubling various countries and becomes a focus problem for restricting the development of economy and green. China is a large energy consumption country, has a unique energy structure, and the price of natural gas in the market is lower than that of diesel oil, so that the natural gas engine is greatly developed.

The sulfur content in the finished natural gas is high, which directly influences the service life of post-treatment noble metal catalysts and parts of devices, especially post-treatment catalysts. Therefore, how to improve the natural gas engine to prolong the service life of the after-treatment catalyst becomes a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a natural gas engine and air intake system thereof, this air intake system can carry out high-efficient desulfurization treatment to the natural gas before the engine cylinder to avoid the life-span of the too high influence aftertreatment catalyst of sulphur content of tail gas.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a natural gas engine's air intake system, include with the air inlet pipeline that the cylinder of natural gas engine links to each other, along admitting air flow direction, heating device and desulphurization unit have set gradually on the air inlet pipeline, be provided with adsorbent and desulfurizer in the desulphurization unit.

Optionally, in the above air intake system, the desulfurization device includes a heat exchange line connected to a circulation water line of the natural gas engine.

Optionally, in the above air intake system, the desulfurization device includes a first region for containing the adsorbent and a second region for containing the desulfurizing agent, the heat exchange pipeline includes a first pipeline and a second pipeline that are connected in parallel, the first pipeline is disposed in the first region, and the second pipeline is disposed in the second region.

Optionally, in the above air intake system, the water inlet and the water outlet of the heating device are connected to a circulation water line of the natural gas engine.

Optionally, in the above air intake system, a pressure reducing valve is provided on the air intake line, and the pressure reducing valve is located upstream of the heating device.

Optionally, in the above air intake system, a temperature sensor disposed in the desulfurization device is further included.

Optionally, in the above air intake system, the adsorbent is activated carbon.

Optionally, in the above air intake system, the desulfurizing agent is a CuO desulfurizing agent, a ZnO desulfurizing agent, and Al₂O₃Any one of the three desulfurizing agents, or a mixture of at least two of the three.

A natural gas engine comprising an air intake system as disclosed in any one of the above.

According to the technical scheme, the utility model provides an among the air intake system of natural gas engine, heating device and desulphurization unit have set gradually along the flow direction that admits air on the intake pipe way, be provided with adsorbent and desulfurizer in the desulphurization unit, in operation, the natural gas is heated by heating device and enters into desulphurization unit after the suitable temperature, organic sulfides in the natural gas can be got rid of to the adsorbent in the desulphurization unit, inorganic sulfides such as hydrogen sulfide in the natural gas can be got rid of to the desulfurizer, the sulfur content of the natural gas that finally enters into the cylinder like this is lower, thereby be favorable to avoiding the life-span of the too high influence aftertreatment catalyst of tail gas sulfur content.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic view of an intake system of a natural gas engine according to an embodiment of the present invention;

fig. 2 is a schematic view of an intake system of a natural gas engine according to a second embodiment of the present invention.

Labeled as:

1. a gas tank; 2. a pressure reducing valve; 3. a heating device; 4. a desulfurization unit; 41. an adsorbent; 42. a desulfurizing agent; 5. a cylinder; A. an air intake line; B. an exhaust line; C. a circulating water line; D. a first pipeline; E. a second pipeline.

Detailed Description

For the sake of understanding, the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, the embodiment of the present invention provides an air intake system of a natural gas engine, which includes an air intake pipeline a connected to a cylinder 5, wherein a heating device 3 and a desulfurization device 4 are sequentially disposed on the air intake pipeline a along an air intake flow direction, and an adsorbent 41 and a desulfurizer 42 are disposed in the desulfurization device 4.

As shown in fig. 1, after compressed natural gas from a gas tank 1 passes through a pressure reducing valve 2, the compressed natural gas enters a heating device 3, the natural gas is heated to a suitable temperature, and then enters a desulfurization device 4. The adsorbent 41 in the desulphurization device 4 can remove organic sulfides in the natural gas, the desulfurizer can remove inorganic sulfides such as hydrogen sulfide in the natural gas, and finally, the natural gas after desulphurization enters the cylinder 5 to be combusted, so that the sulfur content of the tail gas in the exhaust pipeline B can be effectively reduced, and the service life of the aftertreatment catalyst is prevented from being influenced by the overhigh sulfur content of the tail gas.

In a specific practical application, the adsorbent 41 may be activated carbon or carbon molecular sieve, and the desulfurizer 42 may be a CuO desulfurizer, a ZnO desulfurizer or Al₂O₃The desulfurizing agent may be any one of the three, or may be a mixture of at least two of the three. In order to save energy, the present embodiment uses the engine circulating water to provide heat for the heating device 3, as shown in fig. 1, the water inlet and the water outlet of the heating device 3 are connected to the circulating water pipeline C of the natural gas engine. In order to facilitate the desulfurization device 4 to obtain a proper temperature, the desulfurization device 4 of the present embodiment includes a heat exchange pipeline, and similar to the heating device 3, the heat exchange pipeline of the desulfurization device 4 is connected to the circulating water pipeline C of the natural gas engine.

In order to obtain a better desulfurization effect, the temperature of the desulfurization device 4 can be maintained within a certain temperature range, and for this reason, in the present embodiment, a temperature sensor (not shown in the figure) is provided in the desulfurization device 4, the temperature in the desulfurization device 4 is monitored by using the temperature sensor, and the temperature is maintained at a constant temperature by an adjustment measure. It should be noted that "constant temperature" means that the temperature is within a preset temperature range. The temperature adjusting means may be to adjust the flow rate of the circulating water flowing through the desulfurization unit 4.

Referring to fig. 2, unlike the first embodiment in which the adsorbent 41 and the desulfurizing agent 42 are heated together, the second embodiment in which the desulfurizing device 4 includes a first region and a second region, wherein the first region is used for containing the adsorbent 41, the second region is used for containing the desulfurizing agent 42, and the heat exchange pipeline of the desulfurizing device 4 includes a first pipeline D and a second pipeline E that are connected in parallel, as shown in fig. 2, the first pipeline D is disposed in the first region and used for heating the adsorbent 41, and the second pipeline E is disposed in the second region and used for heating the desulfurizing agent 42. In a specific practical application, the first zone and the second zone of the desulfurization device 4 may be respectively provided with a temperature sensor, and the temperatures of the first zone and the second zone may be respectively controlled, so that the adsorbent 41 and the desulfurizing agent 42 are in respective optimal reaction temperatures, which is beneficial to further improving the desulfurization effect of the desulfurization device 4.

The utility model also provides a natural gas engine, this natural gas engine include the air intake system that above-mentioned embodiment is disclosed. Since the air intake system disclosed in the above embodiment has the above technical effects, the natural gas engine having the air intake system also has the above technical effects, and the details are not repeated herein.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The air inlet system of the natural gas engine is characterized by comprising an air inlet pipeline (A) connected with an air cylinder (5) of the natural gas engine, wherein a heating device (3) and a desulfurizing device (4) are sequentially arranged on the air inlet pipeline (A) along the air inlet flow direction, and an adsorbent (41) and a desulfurizing agent (42) are arranged in the desulfurizing device (4).

2. An air inlet system according to claim 1, characterized in that the desulphurization device (4) comprises a heat exchange line connected in the circulation water line (C) of the natural gas engine.

3. The air intake system according to claim 2, wherein the desulfurization device (4) comprises a first zone for containing the adsorbent (41) and a second zone for containing the desulfurizing agent (42), and the heat exchange line comprises a first line (D) and a second line (E) connected in parallel, the first line (D) being disposed in the first zone and the second line (E) being disposed in the second zone.

4. An air inlet system according to claim 2, characterized in that the water inlet and outlet of the heating device (3) are connected to the circulation water line (C) of the natural gas engine.

5. An air inlet system according to claim 4, characterized in that a pressure reducing valve (2) is arranged on the air inlet line (A), which pressure reducing valve (2) is located upstream of the heating device (3).

6. The intake system according to any one of claims 1 to 5, further comprising a temperature sensor provided in the desulfurization device (4).

7. An air inlet system according to claim 6, characterized in that the adsorbent (41) is activated carbon.

8. The method of claim 6The gas system is characterized in that the desulfurizer (42) is a CuO desulfurizer, a ZnO desulfurizer and Al₂O₃Any one of the three desulfurizing agents.

9. A natural gas engine comprising an air intake system as claimed in any one of claims 1 to 8.