CN114276899A - Biogas supply system and control method - Google Patents
Biogas supply system and control method Download PDFInfo
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Abstract
The invention discloses a biogas supply system and a control method thereof. The biogas generator is used for generating biogas, an air inlet of the compressor is connected with the biogas generator through a pipeline, the compressor is used for compressing the input biogas into high-pressure gas and forming an oil-gas mixture with lubricating oil in the compressor to be discharged from an outlet of the compressor, an inlet of the oil-gas barrel is connected with an outlet of the compressor through a pipeline, an air outlet of the oil-gas barrel is connected with a gas terminal through a pipeline, an oil outlet of the oil-gas barrel is connected with an oil return port of the compressor through a pipeline, and the oil-gas barrel is used for separating the input oil-gas mixture. The problem of insufficient air pressure of the gas using terminal is solved through the compressor, so that the methane is combusted more fully, and meanwhile, the long-distance methane transmission is facilitated.
Description
Technical Field
The invention relates to the technical field of methane gas supply, in particular to a methane gas supply system and a control method.
Background
With the rapid development of world economy and the continuous emergence of world energy crisis, the supply of energy sources such as petroleum, natural gas and the like is increasingly tense, and the biogas generated by urban sewage treatment plants and refuse landfill plants is regarded as a clean energy source and is paid more and more attention by more people. Generally, the content of methane in the digestion gas of sewage treatment plants and refuse landfill plants is about 60 percent～65％，CO2About 20-25% of other gases such as H2S, water vapor and the like account for about 5 to 15 percent; the combustion heat value is about 21-23 mJ/m3, and the fuel is an excellent fuel.
The biogas is used as a high-quality clean energy, can be supplied to a biogas generator set for power generation after being purified (the dehydration and the desulfurization of the biogas), compressed, filtered and dried and then passing through a voltage stabilizer, meets the self-supply of partial power supplies of power utilization equipment of sewage plants and refuse landfill plants, realizes the effective utilization of the biogas of urban sewage plants and refuse landfill plants, and has great significance for improving the exhaust quality, saving energy and reducing the operating cost.
Disclosure of Invention
The embodiment of the invention provides a biogas supply system and a control method, which can solve the problem of insufficient air pressure of a gas supply terminal, enable biogas to be combusted more fully and are beneficial to long-distance biogas transmission.
In a first aspect, an embodiment of the present invention provides a biogas supply system, including:
a biogas generator for generating biogas;
the gas inlet of the compressor is connected with the methane generator through a pipeline, the compressor is used for compressing input methane into high-pressure gas, and the high-pressure gas and lubricating oil in the compressor form an oil-gas mixture which is discharged from the outlet of the compressor;
the oil-gas barrel, the import of oil-gas barrel with the export of compressor passes through the pipe connection, the gas outlet and the gas terminal of oil-gas barrel pass through the pipe connection, the oil-out of oil-gas barrel with the oil return opening of compressor passes through the pipe connection, the oil-gas barrel is used for separating the oil-gas mixture of input.
Optionally, the compressor comprises a screw compressor.
Optionally, the biogas supply system further comprises a pre-filter, an air inlet of the pre-filter is connected with the biogas generator through a pipeline, and an air outlet of the pre-filter is connected with an air inlet of the compressor through a pipeline.
Optionally, the biogas supply system further comprises an air inlet electromagnetic valve, an air inlet of the air inlet electromagnetic valve is connected with an air outlet of the pre-filter through a pipeline, and an air outlet of the air inlet electromagnetic valve is connected with an air inlet of the compressor through a pipeline.
Optionally, the biogas supply system further comprises a biogas cooler, an air inlet of the biogas cooler is connected with an air outlet of the oil gas barrel through a pipeline, an air outlet of the biogas cooler is connected with the gas using terminal through a pipeline, a liquid inlet of the biogas cooler is used for inputting cooling liquid, and a liquid outlet of the biogas cooler is used for discharging the cooling liquid.
Optionally, the biogas supply system further comprises an oil cooler, an oil inlet of the oil cooler is connected with an oil outlet of the oil gas barrel through a pipeline, an oil outlet of the oil cooler is connected with an oil return port of the compressor through a pipeline, a liquid inlet of the oil cooler is connected with a liquid outlet of the biogas cooler through a pipeline, and a liquid outlet of the oil cooler is used for discharging cooling liquid.
Optionally, the biogas supply system further comprises an oil filter, an oil inlet of the oil filter is connected with an oil outlet of the oil cooler through a pipeline, and an oil outlet of the oil filter is connected with an oil return port of the compressor through a pipeline.
Optionally, the biogas supply system further comprises an air pressure sensor, wherein the air pressure sensor is arranged at the air outlet of the biogas cooler and used for collecting the air pressure at the air outlet of the biogas cooler.
Optionally, the biogas supply system further comprises a temperature sensor, wherein the temperature sensor is arranged in the oil-gas barrel and used for collecting the temperature of the lubricating oil.
Optionally, the biogas supply system further comprises a heater, wherein the heater is arranged in the oil-gas barrel and used for heating the lubricating oil.
In a second aspect, an embodiment of the present invention further provides a method for controlling a biogas supply system, where the biogas supply system provided in the first aspect of the present invention includes:
when the system is stopped and started, the air outlet pressure of the system and the oil temperature in the oil gas barrel are obtained;
judging whether the air outlet pressure is smaller than the loading pressure or not;
if the air outlet pressure is greater than the loading pressure, the system enters a standby state;
if the air outlet pressure is smaller than the loading pressure, judging whether the oil temperature is normal or not;
if the oil temperature is normal, starting a compressor, and supplying gas to the compressor after the compressor runs for a preset time;
and if the oil temperature is abnormal, heating the lubricating oil in the oil-gas barrel until the oil temperature is normal.
Optionally, the method further includes:
when the system is started in a standby mode, the air outlet pressure of the system and the oil temperature in the oil gas barrel are obtained;
judging whether the air outlet pressure is smaller than the loading pressure or not;
if the air outlet pressure is smaller than the loading pressure, judging whether the oil temperature is normal or not;
if the oil temperature is normal, starting a compressor, and supplying gas to the compressor after the compressor runs for a preset time;
and if the oil temperature is abnormal, heating the lubricating oil in the oil-gas barrel until the oil temperature is normal.
Optionally, the method further includes:
when the system is shut down, the air outlet pressure of the system is obtained;
judging whether the air outlet pressure is greater than the unloading pressure, stopping supplying air to the compressor when the air outlet pressure is greater than the unloading pressure, and controlling the compressor to run empty;
continuously detecting the air pressure, and supplying air to the compressor again when the air pressure is smaller than the loading pressure;
and after the empty vehicle runs for a preset time, controlling the compressor to stop running, and enabling the system to enter a standby state.
The biogas supply system provided by the embodiment of the invention comprises a biogas generator, a compressor and an oil gas barrel. The biogas generator is used for generating biogas, an air inlet of the compressor is connected with the biogas generator through a pipeline, the compressor is used for compressing the input biogas into high-pressure gas and forming an oil-gas mixture with lubricating oil in the compressor to be discharged from an outlet of the compressor, an inlet of the oil-gas barrel is connected with an outlet of the compressor through a pipeline, an air outlet of the oil-gas barrel is connected with a gas terminal through a pipeline, an oil outlet of the oil-gas barrel is connected with an oil return port of the compressor through a pipeline, and the oil-gas barrel is used for separating the input oil-gas mixture. The problem of insufficient air pressure of the gas using terminal is solved through the compressor, so that the methane is combusted more fully, and meanwhile, the long-distance methane transmission is facilitated.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
Fig. 1 is a schematic structural diagram of a biogas supply system according to an embodiment of the present invention;
fig. 2 is a circuit structure diagram of a compressor according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a blower and a heater according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a system shutdown and startup according to an embodiment of the present invention;
FIG. 5 is a flow chart of a system shutdown provided by an embodiment of the present invention;
fig. 6 is a flowchart of a system standby start according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
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. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.
An embodiment of the present invention provides a biogas supply system, and fig. 1 is a schematic structural view of the biogas supply system provided in the embodiment of the present invention, and as shown in fig. 1, the biogas supply system includes a biogas generator 101, a compressor 102, and an oil gas tank 103.
The inlet of the compressor 102 is connected to the biogas generator 101 via a pipe. An inlet of the oil-gas barrel 103 is connected with an outlet of the compressor 101 through a pipeline, an air outlet of the oil-gas barrel 103 is connected with an air using terminal through a pipeline, and an oil outlet of the oil-gas barrel 103 is connected with an oil return port of the compressor 102 through a pipeline.
Wherein the biogas generator 101 stores therein organic waste for generating biogas. Specifically, the methane generator 101 may be a methane tank, or the like, and the embodiment of the present invention is not limited herein.
The biogas generator 101 feeds the generated biogas to the compressor 102. The compressor 102 is used for compressing the input biogas into high-pressure gas, and the high-pressure gas and the lubricating oil in the compressor 102 form an oil-gas mixture which is sent to the oil-gas barrel 103 from the outlet of the compressor 102. For example, in the embodiment of the present invention, the compressor 102 includes a screw compressor, which may be, for example, a single screw compressor or a double screw compressor, and the embodiment of the present invention is not limited herein. Specifically, a pair of intermeshing helical male and female rotors are mounted in the cylinder of the screw compressor, both rotors having a plurality of concave teeth, and both rotors rotating in opposite directions. The clearance between the rotors and between the casing and the rotors is only 5-10 filaments, the main rotor (also called male rotor or male rotor) is driven by an engine or a motor (mostly driven by the motor), and the other rotor (also called female rotor or female rotor) is driven by an oil film formed by oil injection of the main rotor or driven by synchronous gears at the ends of the main rotor and the female rotor. There is no metal contact in the drive (theoretically). The length and diameter of the rotor determine the displacement (flow) and discharge pressure of the compressor, and the longer the rotor, the higher the pressure; the larger the rotor diameter, the greater the flow.
The spiral rotor groove is filled with air when passing through the air suction port. When the rotor rotates, the rotor groove is sealed by the casing wall to form a compression chamber, and after the rotor groove is sealed, lubricating oil is sprayed into the compression chamber to seal. Cooling and lubricating. When the rotor rotates to compress the lubricant and gas (oil-gas mixture for short), the volume of the compression chamber is reduced, and the oil-gas mixture is compressed towards the exhaust port. When the compression chamber passes through the exhaust port, the oil-gas mixture is discharged from the outlet of the compressor 102 and is delivered to the oil-gas barrel 103, and a suction-compression-exhaust process is completed.
The oil-gas barrel 103 is used for separating the input oil-gas mixture and separating the input oil-gas mixture into methane and lubricating oil. The separated biogas is transported to the gas terminal via a pipeline, and the separated lubricating oil is returned to the compressor 102 via a pipeline.
The biogas supply system provided by the embodiment of the invention comprises a biogas generator, a compressor and an oil gas barrel. The biogas generator is used for generating biogas, an air inlet of the compressor is connected with the biogas generator through a pipeline, the compressor is used for compressing the input biogas into high-pressure gas and forming an oil-gas mixture with lubricating oil in the compressor to be discharged from an outlet of the compressor, an inlet of the oil-gas barrel is connected with an outlet of the compressor through a pipeline, an air outlet of the oil-gas barrel is connected with a gas terminal through a pipeline, an oil outlet of the oil-gas barrel is connected with an oil return port of the compressor through a pipeline, and the oil-gas barrel is used for separating the input oil-gas mixture. The problem of insufficient air pressure of the gas using terminal is solved through the compressor, so that the methane is combusted more fully, and meanwhile, the long-distance methane transmission is facilitated.
In some embodiments of the present invention, the compressor is a screw compressor, which has higher efficiency, longer life, and less vibration and noise during operation, compared to a piston compressor.
In some embodiments of the present invention, the biogas supply system further comprises a pre-filter 104, wherein an air inlet of the pre-filter 104 is connected with the biogas generator 101 through a pipeline, and an air outlet of the pre-filter 104 is connected with an air inlet of the compressor 102 through a pipeline. The pre-filter 104 is used to filter impurities in the biogas output from the biogas generator 101 and prevent impurities from entering the compressor 102 and damaging the compressor.
In some embodiments of the present invention, the biogas supply system further includes an air inlet solenoid valve 105, an air inlet of the air inlet solenoid valve 105 is connected to an air outlet of the pre-filter 104 through a pipeline, and an air outlet of the air inlet solenoid valve 105 is connected to an air inlet of the compressor 102 through a pipeline. The control end of the air inlet electromagnetic valve 105 can be connected with the controller, and acts in response to a flow regulating signal sent by the controller to regulate the flow of the biogas inlet.
In the embodiment of the present invention, the compressor 102 compresses the biogas and the lubricating oil, and simultaneously raises the temperature of the oil-gas mixture, so as to avoid possible accidents caused by the excessively high temperature of the biogas, in some embodiments of the present invention, the biogas supply system further includes a biogas cooler 106, an air inlet of the biogas cooler 106 is connected with an air outlet of the oil-gas barrel 103 through a pipeline, an air outlet of the biogas cooler 106 is connected with an air using terminal through a pipeline, a liquid inlet of the biogas cooler 106 is used for inputting cooling liquid, and a liquid outlet of the biogas cooler 106 is used for discharging the cooling liquid. In some embodiments of the present invention, the cooling liquid is cooling water, low-temperature cooling water is input into the liquid inlet of the biogas cooler 106, and the low-temperature cooling water performs non-contact heat exchange with high-temperature biogas in the biogas cooler 106, so as to reduce the temperature of the biogas.
As described above, while the compressor 102 compresses the biogas and the lubricating oil, the temperature of the oil-gas mixture is increased, the temperature of the lubricating oil is too high, which affects the lubricating performance, and in order to avoid the lubricating oil from being too high and reduced, which may cause damage to the compressor 102, in some embodiments of the present invention, the biogas gas supply system further includes an oil cooler 107, an oil inlet of the oil cooler 107 is connected to an oil outlet of the oil-gas barrel 103 through a pipeline, an oil outlet of the oil cooler 107 is connected to an oil return port of the compressor 102 through a pipeline, an oil inlet of the oil cooler 107 is connected to an oil outlet of the biogas cooler 106 through a pipeline, and an oil outlet of the oil cooler 107 is used for discharging the cooling liquid. The coolant discharged from the methane cooler 106 enters the oil cooler 107, and undergoes non-contact heat exchange with the high-temperature lubricating oil in the oil cooler 107, thereby lowering the temperature of the lubricating oil. The cooling liquid is discharged from a liquid outlet of the oil cooler 107 and is input into an external radiator for heat dissipation, so that the cooling liquid is cooled and then flows back to a liquid inlet of the biogas cooler 106 again, and circulation of the cooling liquid is realized. The external heat sink may include a capillary heat sink, a heat sink, or a heat dissipation fan, and embodiments of the present invention are not limited thereto.
In some embodiments of the present invention, the biogas supply system further includes an oil filter 108, an oil inlet of the oil filter 108 is connected to an oil outlet of the oil cooler 107 through a pipeline, and an oil outlet of the oil filter 108 is connected to an oil return port of the compressor 102 through a pipeline. The lubricant oil may carry impurities in pipes or other parts during circulation, and the oil filter 108 is used for filtering the impurities carried in the lubricant oil to prevent the impurities from entering the compressor 102 and damaging the compressor 102.
In some embodiments of the present invention, the biogas supply system further includes an air pressure sensor 109, and the air pressure sensor 109 is disposed at the air outlet of the biogas cooler 106 and is used for collecting the air pressure at the air outlet of the biogas cooler 106. The air pressure sensor 109 may be connected to the controller to transmit the collected air pressure value to the controller, so that the controller may adjust the air pressure value.
In some embodiments of the present invention, the biogas supply system further comprises a temperature sensor 110, and the temperature sensor 110 is disposed in the oil gas barrel 103 and is used for collecting the temperature of the lubricating oil. The temperature sensor 110 may be connected to the controller, and transmit the collected temperature value to the controller, so that the controller may adjust the oil temperature.
In some embodiments of the present invention, the biogas supply system further includes a heater 111, and the heater 111 is disposed in the oil gas barrel 103 for heating the lubricating oil. The heater 111 may be connected to the controller, and start heating the lubricant oil upon receiving a heating signal from the controller.
In the embodiment of the invention, the biogas supply system is arranged in a box body, and the box body is provided with the ventilation fan, so that the ventilation and the heat dissipation with the external environment are realized. The compressor 102 also includes a separate fan for dissipating heat from the compressor 102.
Specifically, the system is firstly self-checked after being electrified, whether equipment breaks down or not is judged, when the equipment breaks down is detected, motors and electromagnetic valves of all the equipment stop running, and otherwise, each equipment enters a running, shutdown or standby state according to a preset program.
Fig. 2 is a circuit structure diagram of a compressor according to an embodiment of the present invention, and as shown in fig. 2, a main motor of the compressor is an inverter motor, and the main motor is connected to a three-phase power grid through a main circuit. In addition, an alternating current output reactor is arranged between the main motor and the main loop, the alternating current output reactor can effectively inhibit the loop from inrush current at the moment of load switching-on, protect a frequency converter and other components in the loop from overcurrent impact, passivate the gradient of output voltage (switching frequency) of the frequency converter, compensate capacitive charge reversal current of a long cable, and reduce disturbance and impact of power elements in the inverter. The control circuit comprises a main control board, the model of the main control board is MD38TX1, and the main control circuit is provided with an emergency stop switch and a frequency converter state indicating lamp. The frequency converter state indicating lamp comprises a frequency converter stop operation indicating lamp, a frequency converter operation indicating lamp and a frequency conversion cabinet power supply indicating lamp.
Fig. 3 is a circuit structure diagram of the fan and the heater according to the embodiment of the present invention, as shown in fig. 3, the independent fan, the ventilation fan and the heater of the main motor are respectively connected to a three-phase power grid, and the independent fan, the ventilation fan and the heater of the main motor are further connected to thermal relays (FR1, FR2, FR 3). The thermal relay serves as an overload protection element for the load.
Fig. 4 is a flowchart of system shutdown and startup provided in the embodiment of the present invention, and as shown in fig. 4, when the system is in a shutdown state, the start/stop of the device is implemented by triggering the start/stop button. After the system is started, whether the air pressure is smaller than the loading pressure is detected through the air pressure sensor 109, if the air outlet pressure is smaller than the loading pressure, whether the oil temperature in the oil-gas barrel is normal is detected through the temperature sensor 110, if the oil temperature is normal, the frequency converter operates and starts the compressor 102, the ventilation fan of the box body and the independent fan of the compressor are started, after specified time delay, the air inlet electromagnetic valve 105 is switched on for loading operation, and if the oil temperature is abnormal (the oil temperature is too low), the heater 111 is controlled to start to work and heat lubricating oil until the oil temperature is normal. And if the air outlet pressure is greater than or equal to the loading pressure, the system enters a standby state.
Fig. 5 is a flowchart of system shutdown according to an embodiment of the present invention, as shown in fig. 5, during operation of the device, the air pressure sensor 109 detects whether the air pressure is greater than the unloading pressure, if the air outlet pressure is greater than the unloading pressure, the air inlet solenoid valve 105 is controlled to be powered off, the device is unloaded and operated and enters an empty time delay, during the empty time delay, whether the air pressure is less than the loading pressure is continuously detected, if so, the air inlet solenoid valve is switched on to load and operate, after the empty time delay time expires, the compressor 102 stops operating, the system enters a standby state, and after a specified time delay, the ventilation fan of the box and the independent fan of the compressor stop operating.
In addition, when the equipment is in the running state, the shutdown can also be realized by triggering a stop button. When the equipment is turned off by the stop button, the air inlet solenoid valve 105 is powered off, the equipment is unloaded and operated, the compressor 102 is stopped after a specified time delay, and the ventilation fan of the box body and the independent fan of the compressor are stopped after a specified time delay.
Fig. 6 is a flowchart of a system standby start according to an embodiment of the present invention, as shown in fig. 6, when the system is in a standby state, the air pressure sensor 109 detects whether the air pressure is smaller than the loading pressure, if the air outlet pressure is smaller than the loading pressure, the temperature sensor 110 continues to detect whether the oil temperature in the oil-gas barrel 103 is normal, if the oil temperature is normal, the compressor 102 is started, the ventilation fan of the box and the independent fan of the compressor are started, and after a specified time is delayed, the air inlet solenoid valve 105 is controlled to perform loading operation; if the oil temperature is abnormal (the oil temperature is low), the heater 111 is controlled to start to work to heat the lubricating oil until the oil temperature is normal.
In the description herein, it is to be understood that the terms "upper", "lower", "left", "right", and the like are used in a descriptive sense or positional relationship based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A biogas supply system is characterized by comprising;
a biogas generator for generating biogas;
the gas inlet of the compressor is connected with the methane generator through a pipeline, the compressor is used for compressing input methane into high-pressure gas, and the high-pressure gas and lubricating oil in the compressor form an oil-gas mixture which is discharged from the outlet of the compressor;
the oil-gas barrel, the import of oil-gas barrel with the export of compressor passes through the pipe connection, the gas outlet and the gas terminal of oil-gas barrel pass through the pipe connection, the oil-out of oil-gas barrel with the oil return opening of compressor passes through the pipe connection, the oil-gas barrel is used for separating the oil-gas mixture of input.
2. The biogas supply system according to claim 1, further comprising a pre-filter and an air inlet solenoid valve;
the gas inlet of the pre-filter is connected with the methane generator through a pipeline, the gas outlet of the pre-filter is connected with the gas inlet of the gas inlet electromagnetic valve through a pipeline, and the gas outlet of the gas inlet electromagnetic valve is connected with the gas inlet of the compressor through a pipeline.
3. The biogas supply system according to claim 1, further comprising a biogas cooler, wherein an air inlet of the biogas cooler is connected with an air outlet of the oil gas barrel through a pipeline, an air outlet of the biogas cooler is connected with the gas using terminal through a pipeline, an inlet of the biogas cooler is used for inputting cooling liquid, and an outlet of the biogas cooler is used for discharging the cooling liquid.
4. The biogas supply system according to claim 3, further comprising an oil cooler, wherein an oil inlet of the oil cooler is connected with an oil outlet of the oil gas barrel through a pipeline, an oil outlet of the oil cooler is connected with an oil return port of the compressor through a pipeline, a liquid inlet of the oil cooler is connected with a liquid outlet of the biogas cooler through a pipeline, and a liquid outlet of the oil cooler is used for discharging cooling liquid.
5. The biogas supply system according to claim 3, further comprising a gas pressure sensor, wherein the gas pressure sensor is disposed at the gas outlet of the biogas cooler and is used for collecting the gas pressure at the gas outlet of the biogas cooler.
6. The biogas supply system according to claim 1, further comprising a temperature sensor disposed in the oil gas barrel for collecting a temperature of the lubricating oil.
7. The biogas supply system according to claim 6, further comprising a heater disposed in the oil gas barrel for heating the lubricating oil.
8. A biogas supply system control method, based on any one of claims 1 to 7, comprising:
when the system is stopped and started, the air outlet pressure of the system and the oil temperature in the oil gas barrel are obtained;
judging whether the air outlet pressure is smaller than the loading pressure or not;
if the air outlet pressure is greater than the loading pressure, the system enters a standby state;
if the air outlet pressure is smaller than the loading pressure, judging whether the oil temperature is normal or not;
if the oil temperature is normal, starting a compressor, and supplying gas to the compressor after the compressor runs for a preset time;
and if the oil temperature is abnormal, heating the lubricating oil in the oil-gas barrel until the oil temperature is normal.
9. The biogas supply system control method according to claim 8, further comprising:
when the system is started in a standby mode, the air outlet pressure of the system and the oil temperature in the oil gas barrel are obtained;
judging whether the air outlet pressure is smaller than the loading pressure or not;
if the air outlet pressure is smaller than the loading pressure, judging whether the oil temperature is normal or not;
if the oil temperature is normal, starting a compressor, and supplying gas to the compressor after the compressor runs for a preset time;
and if the oil temperature is abnormal, heating the lubricating oil in the oil-gas barrel until the oil temperature is normal.
10. The biogas supply system control method according to claim 8, further comprising:
when the system is shut down, the air outlet pressure of the system is obtained;
judging whether the air outlet pressure is greater than the unloading pressure, stopping supplying air to the compressor when the air outlet pressure is greater than the unloading pressure, and controlling the compressor to run empty;
continuously detecting the air pressure, and supplying air to the compressor again when the air pressure is smaller than the loading pressure;
and after the empty vehicle runs for a preset time, controlling the compressor to stop running, and enabling the system to enter a standby state.
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