CN210289963U - LNG vaporization rate and cylinder temperature control system of natural gas engine - Google Patents
LNG vaporization rate and cylinder temperature control system of natural gas engine Download PDFInfo
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- CN210289963U CN210289963U CN201921015328.5U CN201921015328U CN210289963U CN 210289963 U CN210289963 U CN 210289963U CN 201921015328 U CN201921015328 U CN 201921015328U CN 210289963 U CN210289963 U CN 210289963U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The utility model aims at providing a natural gas engine LNG vaporization rate, cylinder temperature control system, the liquefied natural gas that flows out from the LNG storage tank is heated and vaporized in the vaporizer, gets into the stabiliser steady voltage, filters through the gas filter and gets into the premixer, forms homogeneous combustible mixture with the air, and gets into the cylinder of engine and burns and do work; the cooling water outlet of the engine is divided into two branches, the first branch is sequentially provided with a thermostat, a radiator and a water pump and is connected with the cooling water inlet of the engine, the second branch is connected with an expansion water tank, the expansion water tank is connected with a vaporizer through a cooling water channel, and the vaporizer is connected with the radiator. The utility model discloses on the cooling water course, set up cooling water back flow and return pipe valve, considered the influence of two kinds of factors of cooling water flow, temperature to LNG vaporization rate, ECU rationally regulates and control the distribution that is used for cooling engine and the cooling water flow that is used for heating LNG, and then regulates and control LNG's vaporization rate and engine cylinder temperature.
Description
Technical Field
The utility model relates to an engine control system, specifically speaking are natural gas engine control system.
Background
Liquefied Natural Gas (LNG) is mainly composed of hydrocarbons such as methane, has good emission performance after combustion, is a high-efficiency, high-quality, clean energy, has abundant reserves and low cost, is widely concerned, and can be used as a fuel for gas engines.
During transportation and storage, natural gas is stored in cryogenic liquid form in storage tanks. In the actual use process, the vaporizer in the supply system heats and vaporizes the liquefied natural gas stored at low temperature, converts the liquefied natural gas into a state meeting the requirement of an engine, and transmits the liquefied natural gas into a cylinder for combustion. Most of the natural gas engines at present use a water bath type vaporizer, and the heat required in the vaporization process is provided by cooling water of the engine. In the heat exchange process, the hydrothermal liquid is cooling water and outputs heat; the cold liquid is LNG, receiving heat.
The vaporization rate of LNG is affected by the flow rate and temperature of the cooling water flowing into the vaporizer. The greater the cooling water flow and the higher the temperature entering the vaporizer, the faster the vaporization rate of the LNG. At the same time, the supply rate of natural gas also has an effect on the engine work. The engine temperature may be too high or too low due to cooling, LNG vaporization rate, and the like. A portion of the cooling water exiting the engine flows into the vaporizer for heating the LNG, affecting the vaporization rate; another part continues to circulate in the cooling circuit, affecting the cooling of the engine. In the prior art, the distribution of the flow of the two parts of cooling water is difficult to accurately control, and meanwhile, the LNG vaporization rate and the temperature of an engine cylinder are difficult to accurately control.
Disclosure of Invention
An object of the utility model is to provide a solve natural gas engine LNG vaporization rate, the cylinder temperature control system of natural gas engine cylinder high temperature, low scheduling problem excessively.
The purpose of the utility model is realized like this:
the utility model discloses natural gas engine LNG vaporization rate, cylinder temperature control system, characterized by: the LNG storage tank is sequentially connected with the vaporizer, the voltage stabilizer, the gas filter, the premixer and the engine, liquid natural gas flowing out of the LNG storage tank is heated and vaporized in the vaporizer, enters the voltage stabilizer for voltage stabilization, is filtered by the gas filter, enters the premixer, forms homogeneous combustible mixed gas with air, and enters a cylinder of the engine for combustion and work; the cooling water outlet of the engine is divided into two branches, the first branch is sequentially provided with a thermostat, a radiator and a water pump and is connected with the cooling water inlet of the engine, the second branch is connected with an expansion water tank, the expansion water tank is connected with a vaporizer through a cooling water channel, and the vaporizer is connected with the radiator.
The utility model discloses can also include:
1. and a cooling water return pipe is arranged on a cooling water channel between the expansion water tank and the vaporizer, the head and the tail of the cooling water return pipe are connected with the cooling water channel, and a cooling water return pipe valve is arranged on the cooling water return pipe.
2. A cooling loop electromagnetic valve is arranged on a first branch in front of the thermostat; a gas switch electromagnetic valve is arranged between the vaporizer and the voltage stabilizer, a gas injection valve is arranged between the gas filter and the premixer, a temperature sensor is arranged at a cooling water outlet of the engine, and a cooling water return pipe valve, a cooling loop electromagnetic valve and the temperature sensor are all connected with an electronic control system ECU.
The utility model has the advantages that: the utility model discloses on the cooling water course between expansion tank and vaporizer, set up cooling water back flow and return pipe valve, considered the influence of two kinds of factors of cooling water flow, temperature to LNG vaporization rate, ECU rationally regulates and control the distribution that is used for cooling engine and is used for heating LNG's cooling water flow, and then regulates and control LNG's vaporization rate and engine cylinder temperature.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will be described in more detail below by way of example with reference to the accompanying drawings:
with reference to fig. 1, the utility model relates to a natural gas engine LNG vaporization rate, cylinder temperature control system, including natural gas engine 8, natural gas feed system, cooling system, and electrical system ECU 15.
The natural gas supply system includes: LNG storage tank 1, vaporizer 2, gas switching solenoid valve 3, stabiliser 4, gas filter 5, jet valve 6, premixer 7, the liquefied natural gas that flows out from LNG storage tank 1 is heated the vaporization in vaporizer 2, gets into stabiliser 4 steady voltage through gas switching solenoid valve 3, filters through gas filter 5, gets into premixer 7 through jet valve 6, forms the combustible mixture of homogeneity with the air to get into the cylinder of engine 8 and burn and do work.
The cooling system comprises a cooling loop electromagnetic valve 12, a thermostat 11, a radiator 10 and a water pump 9, wherein a part of cooling water flowing out of the engine 8 flows through the thermostat 11 under the control of the cooling loop electromagnetic valve 12, is radiated through the radiator 10, and is supplied to the engine 8 for cooling by the water pump 9 to form a cooling loop.
Another part of the cooling water flowing out of the engine 8 flows into the expansion water tank 14, passes through the cooling water channel 17, flows into the hot water inlet of the vaporizer 2, and is used for providing heat for vaporization of the LNG, and a cooling water return pipe 16 is arranged on the cooling water channel 17.
The electronic control system ECU15 is connected with the cooling water return pipe valve 18, the temperature sensor 13 and the cooling loop electromagnetic valve 12, monitors the temperature of the engine water outlet, the flow rate of the cooling water flowing into the cooling loop and the flow rate of the cooling water flowing into the expansion water tank, and reasonably controls the opening degree of the cooling loop electromagnetic valve 12 and the opening degree of the cooling water return pipe valve 18.
After the cooling water flows out of the engine 8, a part of the cooling water flows into the thermostat 11 and continues to circulate in the cooling loop; another portion flows into expansion tank 14 through cooling water channel 17 to the hot liquid inlet of vaporizer 2 for providing heat for vaporization of LNG. When the cylinder temperature of the engine 8 is high, the temperature of the cooling water flowing out of the engine 8 also increases. The temperature signal is transmitted to the ECU15 through the temperature sensor 13, when the measured temperature is higher than 5% of the set value, the ECU15 controls the cooling water return pipe valve 18 to open to 5% of the high temperature cooling water return, the flow rate of the cooling water flowing into the hot liquid inlet of the vaporizer 2 decreases, and the LNG vaporization rate does not increase too fast due to the increase of the cooling water temperature. When the cylinder temperature of the engine 8 is higher than 10% of the set value, the ECU15 controls the return pipe valve 18 to open to make the high-temperature cooling water return by 10%, the flow rate of the cooling water flowing into the hot liquid inlet of the vaporizer 2 decreases to decrease the vaporization rate of the LNG, the flow rate of the gaseous natural gas supplied to the engine 8 decreases, the work rate of the engine 8 decreases, and the cylinder temperature returns to a normal level.
When the cylinder temperature of the engine 8 is low, the temperature of the cooling water flowing out of the engine 8 also decreases. When the sensor 13 detects that the temperature is lower than 5% of the set value, the ECU15 controls the valve opening of the electromagnetic valve 12 in the cooling circuit to decrease until the flow rate of the cooling water flowing into the cooling circuit decreases by 5%, and the flow rate of the cooling water flowing into the expansion tank 14 increases, that is, the flow rate of the cooling water flowing into the hot liquid inlet of the vaporizer 2 increases, so that the vaporization rate of the LNG does not decrease too fast due to the decrease in the temperature of the cooling water. When the measured cylinder temperature of the engine 8 is lower than 10% of the set value, the ECU15 controls the opening degree of the electromagnetic valve 12 in the cooling circuit to be reduced until the flow of the cooling water flowing into the cooling circuit is reduced by 10%, the flow of the cooling water flowing into the expansion water tank 14 and the hot liquid inlet of the vaporizer 2 is larger, the vaporization rate of the LNG is increased, the flow of the gaseous natural gas supplied to the engine 8 is increased, the power application rate of the engine 8 is increased, and the cylinder temperature returns to a normal level.
Claims (3)
1. Natural gas engine LNG vaporization rate, cylinder temperature control system, characterized by: the LNG storage tank is sequentially connected with the vaporizer, the voltage stabilizer, the gas filter, the premixer and the engine, liquid natural gas flowing out of the LNG storage tank is heated and vaporized in the vaporizer, enters the voltage stabilizer for voltage stabilization, is filtered by the gas filter, enters the premixer, forms homogeneous combustible mixed gas with air, and enters a cylinder of the engine for combustion and work; the cooling water outlet of the engine is divided into two branches, the first branch is sequentially provided with a thermostat, a radiator and a water pump and is connected with the cooling water inlet of the engine, the second branch is connected with an expansion water tank, the expansion water tank is connected with a vaporizer through a cooling water channel, and the vaporizer is connected with the radiator.
2. The natural gas engine LNG vaporization rate, cylinder temperature control system of claim 1, wherein: and a cooling water return pipe is arranged on a cooling water channel between the expansion water tank and the vaporizer, the head and the tail of the cooling water return pipe are connected with the cooling water channel, and a cooling water return pipe valve is arranged on the cooling water return pipe.
3. The natural gas engine LNG vaporization rate, cylinder temperature control system of claim 1 or 2, characterized by: a cooling loop electromagnetic valve is arranged on a first branch in front of the thermostat; a gas switch electromagnetic valve is arranged between the vaporizer and the voltage stabilizer, a gas injection valve is arranged between the gas filter and the premixer, a temperature sensor is arranged at a cooling water outlet of the engine, and a cooling water return pipe valve, a cooling loop electromagnetic valve and the temperature sensor are all connected with an electronic control system ECU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921015328.5U CN210289963U (en) | 2019-07-02 | 2019-07-02 | LNG vaporization rate and cylinder temperature control system of natural gas engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921015328.5U CN210289963U (en) | 2019-07-02 | 2019-07-02 | LNG vaporization rate and cylinder temperature control system of natural gas engine |
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| CN210289963U true CN210289963U (en) | 2020-04-10 |
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| CN201921015328.5U Active CN210289963U (en) | 2019-07-02 | 2019-07-02 | LNG vaporization rate and cylinder temperature control system of natural gas engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112901339A (en) * | 2021-01-15 | 2021-06-04 | 河北工业大学 | Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112901339A (en) * | 2021-01-15 | 2021-06-04 | 河北工业大学 | Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof |
| CN112901339B (en) * | 2021-01-15 | 2022-04-26 | 河北工业大学 | Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof |
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