CN215595706U

CN215595706U - Engine for gas cogeneration system and gas cogeneration system

Info

Publication number: CN215595706U
Application number: CN202121661798.6U
Authority: CN
Inventors: 李春玺; 张永恒; 马海明
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2022-01-21
Anticipated expiration: 2031-07-21

Abstract

The utility model discloses an engine for a gas cogeneration system and the gas cogeneration system, and relates to the technical field of gas thermoelectric motors. The engine for the gas cogeneration system comprises an engine body and a multi-stage intercooler, wherein a cooling water circulation pipeline is arranged in the engine body and used for heat dissipation in the engine body. The multistage intercooler at least comprises a first-stage intercooler and a second-stage intercooler, the air inlet of the first-stage intercooler is connected with the air inlet system, the air outlet of the first-stage intercooler is connected with the air inlet of the second-stage intercooler, and the air outlet of the second-stage intercooler is connected with the air inlet of the engine body. The first-stage intercooler is provided with a first water inlet and a first water outlet, and cooling water enters the first-stage intercooler through the first water inlet and the first water outlet to absorb heat in the cooling water and then is discharged through the first water inlet and the first water outlet; and a second water inlet and outlet is formed in the second-stage intercooler, and cooling water enters the second-stage intercooler through the second water inlet and outlet to absorb heat in the cooling water and is discharged through the second water inlet and outlet. The system reduces the matching difficulty.

Description

Engine for gas cogeneration system and gas cogeneration system

Technical Field

The utility model relates to the technical field of gas heat and power generators, in particular to an engine for a gas heat and power cogeneration system and the gas heat and power cogeneration system.

Background

In the cogeneration system, an engine is used for driving a generator, fuel gas is converted into electric energy with the efficiency of about 30-38%, and exhaust heat and cooling water heat discharged by the engine can be used for heat recovery to meet the heat energy requirement of a user. 40-50% or more of fuel energy can be recovered through exhaust gas and cooling water, so that the aim of comprehensive utilization of energy is fulfilled.

Engines in a cogeneration system in the prior art are all matched with a mechanical water pump and used for circulating engine cooling liquid, but the matched cogeneration unit needs to be connected with a cooling system of a waste heat recovery device of the whole unit, a mechanical water pump is needed to control the water flow of the whole system to achieve the optimal control of heat, and the lift of the mechanical water pump matched with the traditional engine cannot be met; a high-lift mechanical water pump is required to be arranged or an electric water pump is added, so that the matching difficulty is increased; and only set up the gas that gets into the engine body of an intercooler cooling among the prior art, the cooling effect is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an engine for a gas cogeneration system, which can reduce the matching difficulty and has good cooling effect.

Another object of the present invention is to provide a gas cogeneration system, which reduces the difficulty and cost of matching.

In order to achieve the purpose, the utility model adopts the following technical scheme:

an engine for a gas cogeneration system, comprising:

the engine body is internally provided with a cooling water circulation pipeline for heat dissipation in the engine body;

the multi-stage intercooler comprises at least a first-stage intercooler and a second-stage intercooler, wherein an air inlet of the first-stage intercooler is connected with an air inlet system, an air outlet of the first-stage intercooler is connected with an air inlet of the second-stage intercooler, and an air outlet of the second-stage intercooler is connected with an air inlet of the engine body;

a first water inlet and outlet is formed in the first-stage intercooler, and cooling water enters the first-stage intercooler through the first water inlet and outlet to absorb heat in the first-stage intercooler and then is discharged through the first water inlet and outlet; and a second water inlet and outlet is formed in the second-stage intercooler, and cooling water enters the second-stage intercooler through the second water inlet and outlet to absorb heat in the cooling water and is discharged through the second water inlet and outlet.

As a preferable aspect of the engine for a gas cogeneration system, a first temperature sensor is provided at an air outlet of the secondary intercooler, and the first temperature sensor is configured to detect a temperature of gas entering the engine body.

As a preferable scheme of the engine for the gas cogeneration system, the first water inlet/outlet is connected with a waste heat recovery device.

As a preferable scheme of the engine for the gas cogeneration system, the second-stage intercooler cools the cooling water in the second-stage intercooler by the cooling fan.

As a preferred scheme of engine for gas cogeneration of heat and power system, cooling water circulation pipeline includes water inlet and delivery port, the water inlet is provided with second temperature sensor, second temperature sensor is used for detecting into water the temperature, the delivery port is provided with third temperature sensor, third temperature sensor is used for detecting out the temperature of water.

As a preferable aspect of the engine for the gas cogeneration system, an air cleaner for filtering gas entering the engine body and a supercharger for supercharging the gas are provided in the intake system.

As a preferable aspect of the engine for a gas cogeneration system, the intake system further includes a gas mixer, and the gas mixer is disposed between the air cleaner and the supercharger.

As a preferable scheme of the engine for the gas cogeneration system, the engine for the gas cogeneration system further comprises an exhaust assembly, the exhaust assembly comprises an exhaust pipe, one end of the exhaust pipe is connected with the air outlet of the engine body, and the other end of the exhaust pipe is connected with a waste heat recovery device.

As a preferable scheme of the engine for the gas cogeneration system, the outer wall of the exhaust pipe is provided with an insulating layer.

As a preferable aspect of the engine for a gas cogeneration system, the engine for a gas cogeneration system further comprises a lubrication assembly, wherein the lubrication assembly comprises a plurality of threaded interfaces with different specifications to connect different auxiliary devices.

A gas cogeneration system comprising the engine for a gas cogeneration system of any one of the above.

The utility model has the beneficial effects that:

the utility model provides an engine for a gas cogeneration system, which is characterized in that a cooling water circulation pipeline is arranged in an engine body and used for radiating heat generated by the operation of the engine body. The air of the air inlet system is radiated through the multi-stage intercooler, so that the temperature of the air entering the engine body reaches the target value allowed by the engine body. The one-level intercooler is provided with a first water inlet and a first water outlet, and heat in the one-level intercooler is taken away through cooling water. And the gas coming out of the first-stage intercooler enters a second-stage intercooler, the second-stage intercooler is provided with a second water inlet and a second water outlet, and the gas is cooled through the second-stage intercooler so as to reach a target value allowed to enter the engine body. According to the engine for the gas cogeneration system, the cooling system of the engine body and the cooling system of the inlet air are separately arranged, the air provided by the inlet air system is cooled through the multi-stage intercooler, the engine body is cooled through the cooling water circulation pipeline in the engine body, the traditional mechanical water pump is omitted, the electric water pump with the corresponding lift can be matched according to the actual resistance of the cooling water circulation pipeline, the cooling of the whole system can be realized, the matching difficulty is reduced, and the cooling effect is improved.

The utility model also provides a gas cogeneration system, and the engine for the gas cogeneration system is applied, so that the matching difficulty and the matching cost of the engine cooling system are reduced, and the cooling effect is improved.

Drawings

FIG. 1 is a first perspective structural view of an engine for a gas fired cogeneration system in accordance with an embodiment of the present invention;

fig. 2 is a second perspective structural schematic diagram of an engine for a gas cogeneration system according to an embodiment of the present invention.

In the figure:

1. an engine body; 2. a first-stage intercooler; 3. a second-stage intercooler; 4. a first temperature sensor; 5. an air cleaner; 6. a supercharger; 7. a gas mixer; 8. an exhaust pipe; 9. an electronic control unit 10, a screw interface;

11. a water inlet; 12. a water outlet; 13. an igniter; 21. a first water inlet and outlet; 31. a second water inlet and outlet.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

How to improve the fuel utilization rate is the direction of continuous efforts and pursuits of modern industries, a gas cogeneration system provides a new energy utilization idea, and the comprehensive energy utilization rate can reach 80% or more.

The engine bodies of the engines for the gas cogeneration systems in the prior art are all provided with mechanical water pumps for circulating the cooling liquid of the engine bodies. However, the cooling system of the engine body needs to be connected with the cooling system of the waste heat recovery device of the whole cogeneration unit, the water flow of the whole system is controlled by the mechanical water pump to achieve the optimal control of heat, the lift of the mechanical water pump of the traditional engine body cannot be met, a mechanical water pump with large lift needs to be equipped or an electric water pump needs to be added, and the matching difficulty is increased; and only set up the intercooler and cool off the gas that gets into the engine body, the cooling effect is poor.

The embodiment provides a gas cogeneration system, which comprises an engine and a generator for the gas cogeneration system, wherein the engine body 1 and the generator are connected through a flywheel shell to drive the generator to work to generate electric energy. The flywheel shell plays the roles of connecting the engine body, protecting and carrying.

The gas cogeneration of heat and power system that this embodiment provided has reduced engine cooling system's supporting degree of difficulty, has improved the cooling effect.

As shown in fig. 1 and fig. 2, the embodiment further provides an engine for a gas cogeneration system, which includes an engine body 1 and a multi-stage intercooler, wherein a cooling water circulation pipeline is arranged in the engine body 1 and used for heat dissipation in the engine body 1. The multistage intercooler at least comprises a first-stage intercooler 2 and a second-stage intercooler 3, the air inlet of the first-stage intercooler 2 is connected with the air inlet system, the air outlet of the first-stage intercooler 2 is connected with the air inlet of the second-stage intercooler 3, and the air outlet of the second-stage intercooler 3 is connected with the air inlet of the engine body 1. The first-stage intercooler 2 is provided with a first water inlet and outlet 21, and cooling water enters the first-stage intercooler 2 through the first water inlet and outlet 21, absorbs heat in the cooling water and is discharged through the first water inlet and outlet 21; the second intercooler 3 is provided with a second water inlet and outlet 31, and cooling water enters the second intercooler 3 through the second water inlet and outlet 31 to absorb heat therein and then is discharged through the second water inlet and outlet 31.

The engine for the gas cogeneration system provided in the present embodiment is provided with a cooling water circulation line in the engine body 1, for dissipating heat generated by the operation of the engine body 1. The air in the air inlet system is radiated by the multi-stage intercooler, so that the temperature of the air entering the engine body 1 reaches the target value allowed by the engine body 1. The one-stage intercooler 2 is provided with a first water inlet/outlet 21 for taking away heat in the one-stage intercooler 2 through cooling water. The gas from the first-stage intercooler 2 enters the second-stage intercooler 3, the second-stage intercooler 3 is provided with a second water inlet and outlet 31, and the gas is cooled by the second-stage intercooler 3 to reach a target value allowed to enter the engine body 1. The engine for gas cogeneration of heat and power system that this embodiment provided, separately set up the cooling system of engine body 1 and the cooling system who admits air, cool off the gas that air intake system provided through multistage intercooler, cool off engine body 1 through the cooling water circulation pipeline of engine body 1 inside, traditional mechanical water pump has been cancelled, can match the electric water pump of corresponding lift according to the actual resistance of cooling water circulation pipeline, can realize entire system's cooling, supporting degree of difficulty has been reduced, the cooling effect has been improved.

In this embodiment, through setting up the two-stage intercooler, the intercooling effect is better. The gas temperature in the gas inlet system can reach the target value allowed by the gas entering the engine body 1 without being cooled by matching with cooling water with lower temperature, the matching difficulty of the engine for the gas cogeneration system is reduced, and the matching efficiency of products is improved. The first intercooler 2 is provided with a first water inlet and outlet 21, the second intercooler 3 is provided with a second water inlet and outlet 31, cooling water in the first intercooler 2 is periodically discharged through the first water inlet and outlet 21, and new cooling water is added into the first intercooler 2 through the first water inlet and outlet 21 so as to achieve the purpose of cooling the gas passing through the first intercooler 2. Similarly, the cooling water in the second intercooler 3 is periodically discharged through the second water inlet/outlet 31, and new cooling water is added into the second intercooler 3 through the second water inlet/outlet 31, so as to achieve the purpose of cooling the gas passing through the second intercooler 3. After the air in the air inlet system is cooled by the first-stage intercooler 2 and the second-stage intercooler 3, the temperature of the air can reach the target value allowed by the engine body 1. Of course, in other embodiments, a greater number of intercoolers may be provided to cool the air in the air intake system.

As a preferred embodiment of the engine for a gas cogeneration system, an air cleaner 5 and a supercharger 6 are provided in an intake system, the air cleaner 5 is used for filtering gas entering the engine body 1, and the supercharger 6 is used for supercharging gas so as to burn the gas entering the engine body 1.

As a preferable aspect of the engine for the gas cogeneration system, the intake system further includes a gas mixer 7, and the gas mixer 7 is disposed between the air cleaner 5 and the supercharger 6. The gas mixer 7 is provided between the air cleaner 5 and the supercharger 6, and is more suitable for users of low-pressure gas. The air is filtered by the air filter 5, then is mixed with the gas in the gas mixer 7, and then is connected with the gas supply pipeline of the low-pressure gas user, so that the low-pressure gas is provided for the user to meet the heat supply requirement.

In this embodiment, one-level intercooler 2 and second grade intercooler 3 set up side by side in the top of bell housing, and air cleaner 5 sets up in the front end of bell housing.

In order to be more convenient to be matched with an external cooling circulation system, special nameplates are arranged on the first-stage intercooler 2 and the second-stage intercooler 3, and information of the highest water inlet temperature, recommended water flow and resistance of the intercoolers under the recommended water flow of the intercoolers is engraved on the nameplates.

As a preferable aspect of the engine for a gas cogeneration system, the outlet of the secondary intercooler 3 is provided with a first temperature sensor 4, and the first temperature sensor 4 is used for detecting the temperature of gas entering the engine body 1. The temperature of the gas entering the air inlet of the engine body 1 is monitored by the first temperature sensor 4 to ensure that the temperature of the gas cooled by the first-stage intercooler 2 and the second-stage intercooler 3 reaches a target value allowed to enter the engine body 1.

As a preferable embodiment of the engine for the gas cogeneration system, the first water inlet/outlet 21 is connected to a waste heat recovery device. In this embodiment, the heat that cooling water in the one-level intercooler 2 was taken away can be retrieved as effective heat, supplies life hot water through the heat exchanger.

As a preferable aspect of the engine for the gas cogeneration system, the second-stage intercooler 3 cools the cooling water in the second-stage intercooler 3 by the cooling fan. In this embodiment, the cooling water discharged from the second-stage intercooler 3 is not recovered, and is cooled by an external cooling fan.

As a preferable scheme of the engine for the gas cogeneration system, the cooling water circulation pipeline includes a water inlet 11 and a water outlet 12, the water inlet 11 is provided with a second temperature sensor for detecting a temperature of inlet water, the water outlet 12 is provided with a third temperature sensor for detecting a temperature of water. Whether the temperature of the inlet and outlet water of the engine body 1 meets the standard or not is detected through a second temperature sensor and a third temperature sensor.

The engine body 1 is further provided with a nameplate, and information of rated maximum water outlet temperature, maximum water inlet temperature, minimum water inlet temperature, recommended water flow and pressure drop of the engine body under the recommended water flow of the engine body 1 is engraved on the nameplate, so that the matching and model selection of the electric control water pump of the cogeneration system are facilitated.

As a preferred scheme of the engine for the gas cogeneration system, the engine for the gas cogeneration system further comprises an exhaust assembly, the exhaust assembly comprises an exhaust pipe 8, one end of the exhaust pipe 8 is connected with an air outlet of the engine body 1, and the other end of the exhaust pipe is connected with a waste heat recovery device. The cooled mixed gas enters the engine body 1, the mixed gas is ignited through the igniter 13, the mixed gas burns to do work, high-temperature waste gas which does work is discharged through the exhaust pipe 8, and the discharged high-temperature waste gas is recycled by the waste heat recovery device.

As a preferable embodiment of the engine for the gas cogeneration system, the outer wall of the exhaust pipe 8 is provided with an insulating layer. In this embodiment, the heat insulating layer wrapped by the outer wall of the exhaust pipe 8 is a high-temperature-resistant heat insulating material, so that heat loss can be effectively prevented.

In this embodiment, only two electric water pumps are needed to realize the cooling cycle of the whole gas cogeneration system. Since the heat of the coolant in the second-stage intercooler 3 is small, the heat in the second-stage intercooler 3 is not recovered. The cooling water circulation pipeline in the engine body 1 and the cooling water circulation pipeline in the first-stage intercooler 2 share the electric water pump with a large lift, and the cooling water circulation pipeline in the second-stage intercooler 3 uses the electric water pump with a small lift. It should be noted that the specific lift of the electric water pump is not limited, and can be matched according to actual requirements.

The engine for the gas cogeneration system that this embodiment provided also can replace the supporting mechanical water pump of fixed lift of engine body 1 according to the electric water pump of the actual resistance matching lift of cooling water circulation pipeline, has reduced supporting degree of difficulty.

Of course, in other embodiments, one electric water pump may be matched to each of the engine body 1 and the one-stage intercooler 2.

As a preferable aspect of the engine for a gas cogeneration system, the engine for a gas cogeneration system further includes a lubrication assembly, and the lubrication assembly includes a plurality of screw interfaces 10 of different specifications to connect different auxiliary devices. The gas cogeneration system is generally unattended, is generally provided with an automatic oil supplementing system or an electric oil changing system, is selectively provided with functional configurations such as engine oil heating and electric oil changing, and is provided with the threaded interfaces 10 with different specifications on an oil pan of the engine body 1, so that a user can conveniently connect with external auxiliary equipment for matching and use.

In this embodiment, the engine for the gas cogeneration system further includes an electronic control unit 9, the electronic control unit 9 is electrically connected with the first temperature sensor 4, the second temperature sensor, the third temperature sensor and the engine body 1, the electronic control unit 9 controls whether the gas enters the engine body 1 according to the temperature detected by the first temperature sensor 4, and when the temperature detected by the second temperature sensor satisfies the temperature of the inlet water entering the engine body 1, the electronic control unit 9 controls the cooling water to enter the engine body 1 from the water inlet 11; when the temperature detected by the third temperature sensor satisfies the water outlet temperature of the engine body 1, the electronic control unit 9 controls the cooling water in the engine body 1 to be discharged out of the engine body 1 from the water outlet 12. The electronic control unit 9 is also used to control the mixing ratio of gas and air under different loads of the engine body 1. It should be noted that the electrical connection mode and the operation principle of the electronic control unit 9, the first temperature sensor 4, the second temperature sensor, the third temperature sensor and the engine body 1 are already the prior art, and are not described herein again.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims

1. An engine for a gas cogeneration system, comprising:

the engine comprises an engine body (1), wherein a cooling water circulation pipeline is arranged in the engine body (1) and used for heat dissipation in the engine body (1);

the multistage intercooler at least comprises a first-stage intercooler (2) and a second-stage intercooler (3), wherein an air inlet of the first-stage intercooler (2) is connected with an air inlet system, an air outlet of the first-stage intercooler (2) is connected with an air inlet of the second-stage intercooler (3), and an air outlet of the second-stage intercooler (3) is connected with an air inlet of the engine body (1);

a first water inlet and outlet (21) is formed in the first-stage intercooler (2), and cooling water enters the first-stage intercooler (2) through the first water inlet and outlet (21) to absorb heat in the cooling water and is discharged through the first water inlet and outlet (21); and a second water inlet and outlet (31) is formed in the second-stage intercooler (3), and cooling water enters the second-stage intercooler (3) through the second water inlet and outlet (31) to absorb heat in the cooling water and then is discharged through the second water inlet and outlet (31).

2. Engine for a gas combined heat and power system according to claim 1, characterized in that the outlet of the secondary intercooler (3) is provided with a first temperature sensor (4), the first temperature sensor (4) being used to detect the temperature of the gas entering the engine block (1).

3. The engine for a gas cogeneration system of claim 1, wherein said first water inlet/outlet (21) is connected to a waste heat recovery device.

4. The engine for a gas cogeneration system of claim 1, wherein the secondary intercooler (3) cools the cooling water in the secondary intercooler (3) by a cooling fan.

5. The engine for a gas cogeneration system of claim 1, wherein the cooling water circulation line comprises a water inlet (11) and a water outlet (12), the water inlet (11) is provided with a second temperature sensor for detecting a temperature of inlet water, and the water outlet (12) is provided with a third temperature sensor for detecting a temperature of water.

6. The engine for a gas cogeneration system of claim 1, characterized in that an air filter (5) and a supercharger (6) are provided in the intake system, the air filter (5) is used for filtering gas entering the engine body (1), and the supercharger (6) is used for supercharging gas.

7. The engine for a gas cogeneration system of claim 6, wherein the air intake system further comprises a gas mixer (7), the gas mixer (7) being disposed between the air cleaner (5) and the supercharger (6).

8. The engine for the gas cogeneration system of heat and power as claimed in claim 1, further comprising an exhaust assembly, wherein the exhaust assembly comprises an exhaust pipe (8), one end of the exhaust pipe (8) is connected with an air outlet of the engine body (1), and the other end of the exhaust pipe is connected with a waste heat recovery device.

9. The gas cogeneration system engine according to claim 8, wherein the outer wall of the exhaust pipe (8) is provided with an insulating layer.

10. The engine for a gas combined heat and power system according to claim 1, further comprising a lubrication assembly comprising a plurality of threaded interfaces (10) of different specifications to connect different auxiliary devices.

11. A gas cogeneration system, comprising the engine for a gas cogeneration system according to any one of claims 1 to 10.