CN115095452B - Gas supply system of gas engine test bed and control method - Google Patents
Gas supply system of gas engine test bed and control method Download PDFInfo
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- CN115095452B CN115095452B CN202210779178.5A CN202210779178A CN115095452B CN 115095452 B CN115095452 B CN 115095452B CN 202210779178 A CN202210779178 A CN 202210779178A CN 115095452 B CN115095452 B CN 115095452B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
- F02D19/021—Control of components of the fuel supply system
- F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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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
Abstract
The invention discloses a gas supply system of a gas engine test bed and a control method, which solve the problem that the test bed in the prior art cannot meet the requirement of the engine on the diversity of gas flow, and have the beneficial effect of fully meeting the requirement of the gas engine test, and the specific scheme is as follows: the utility model provides a gas engine test bench air feed system, including the fuel storage tank, the fuel storage tank is connected with heat transfer device, be connected with parallelly connected multiunit power pump between fuel storage tank and the heat transfer device, the maximum flow of one set of power pump is greater than the maximum flow of another set of power pump, the maximum flow of a set of power pump that the maximum flow is less is greater than the minimum flow of another set of power pump, each set of power pump sets up at least one power pump, heat transfer device is connected with the gas valves, the gas valves is connected with experimental gas engine, the pipeline that heat transfer device and gas valves are connected sets up the flowmeter, the power pump is connected with the control unit respectively.
Description
Technical Field
The invention relates to the field of engine tests, in particular to a gas supply system of a gas engine test bed and a control method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With the increasing global emissions regulations, liquefied Natural Gas (LNG) is increasingly favored by shipmen and shipyards as a low-emission fuel. Currently, more and more ships have chosen LNG as a ship fuel.
LNG liquefied natural gas (Liquefied Natural Gas). The main component is methane. LNG is colorless, odorless, nontoxic and noncorrosive, has a volume of about 1/600 of the volume of the same amount of gaseous natural gas, and has a weight of only about 45% of the same volume of water. Is in liquid state at-162 ℃.
LNG is a liquefied state of natural gas at-162 ℃ and contains methane (CH) 4 ) It has the characteristics of low temperature, easy volatilization, inflammability, explosiveness and the like. The volume of the gas is 600 times of the volume of the liquid, and the explosion limit after vaporization is 5% -15%. For safety, LNG should be properly isolated from air in any state.
The marine engine manufacturer needs to perform test before each engine leaves the factory, so the engine manufacturer needs to be equipped with natural gas which can meet the test requirement as fuel. The pressure of the fuel gas used by the high-pressure fuel gas engine is up to 20-30 MPa, and the pressure is correspondingly different under different loads. Since such high fuel gas is almost impossible to recover, it is required to be quantitatively supplied. I.e. how much gas is needed by the engine, i.e. how much is supplied, neither more nor less. If the amount of supplied fuel gas is excessive, fuel gas which cannot be consumed by the engine can accumulate in the pipeline, so that the pressure is increased, and finally, the stop is triggered. If the gas is too low, the gas supply pressure will gradually decrease, eventually triggering a stop.
If only one power is used for running the engine, the problem is easy to solve, namely, a high-pressure LNG pump with a specific model is selected according to the lowest air consumption and the highest air consumption of the engine, but various powers of the engine produced by an engine manufacturer are as low as 3000-5000 kW and as high as 30000-50000 kW, and the required fuel gas consumption is quite different. For example, an engine with 5000kW of power has the minimum air consumption requirement of 65kg/h and the maximum air consumption of 840kg/h. And a 50000kW engine with a minimum air consumption of 580kg/h and a maximum air consumption of 7000kg/h. If the capacity of the high-pressure pump for delivering LNG is too low, the engine test requirement of high power output cannot be met, and if the capacity of the selected LNG high-pressure pump is too high, the minimum output is also relatively high, and the small gas consumption requirement of the low-power engine cannot be met.
The inventor finds that the current test bed cannot meet the requirement of the engine on the diversity of the gas flow; the test bed has insufficient universality, can not meet the test requirements of engines with different power and sizes, and can not adapt to different models.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a gas supply system of a gas engine test bed, which can meet the test requirements of high-pressure dual-fuel engines with various types and different power magnitudes.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the utility model provides a gas engine test bench air feed system, including the fuel storage tank, the fuel storage tank is connected with heat transfer device, be connected with parallelly connected multiunit power pump between fuel storage tank and the heat transfer device, the maximum flow of power pump of one set of wherein is greater than the maximum flow of another power pump, the maximum flow of the less power pump of a set of power pump of maximum flow is greater than the minimum flow of another power pump of another set, each power pump of set sets up at least one power pump, heat transfer device is connected with the gas valves, the gas valves is connected with experimental gas engine, the pipeline that heat transfer device and gas valves are connected sets up the flowmeter, the power pump, the gas engine is connected with the control unit respectively.
The gas supply system is provided with the plurality of groups of power pumps in parallel, the whole fuel supply system can supply fuel to the gas engine, and the control unit regulates and controls the fuel flow requirement of the gas engine, so that the control unit controls the power pumps with different flow to be started or stopped according to the fuel flow requirement of the gas engine, the test requirement of the gas engine is fully met, and the gas supply system can be suitable for engines of different types.
According to the gas supply system of the gas engine test bed, the buffer tank is arranged between the heat exchange device and the gas valve group;
the flowmeter is connected to a pipeline between the buffer tank and the gas valve group.
According to the gas supply system of the gas engine test bed, the first regulating valve is arranged between the heat exchange device and the buffer tank and connected with the control unit, the first regulating valve is connected with the silencer, and the first regulating valve is used for emptying gas in the pipeline after the test of the test bed is completed, so that noise during emptying of high-pressure gas can be reduced through the arrangement of the silencer.
According to the gas supply system of the gas engine test bed, the pipeline between the heat exchange device and the buffer tank is provided with the temperature sensor for monitoring the gas temperature after the heat exchange device, and the temperature sensor is connected with the control unit.
According to the gas supply system of the gas engine test bed, the second regulating valve is connected between the inlet and the outlet of the heating medium of the heat exchange device, and the second regulating valve is connected with the control unit;
the control unit controls the opening of the second regulating valve according to the temperature of the fuel gas after the heat exchange device is monitored by the temperature sensor;
when the gas temperature is higher than a set value, the control unit controls the second regulating valve to increase the opening degree to reduce the water glycol flowing through the heat exchange device, so that the gas temperature is reduced; when the gas temperature is lower than the set value, the control unit controls the second regulating valve to reduce the opening degree, so that the water glycol flowing through the heat exchange device is increased, and the gas temperature is improved.
According to the gas supply system of the gas engine test bed, the pipeline between the heat exchange device and the buffer tank is provided with the pressure sensor for monitoring the gas pressure after the heat exchange device, and the pressure sensor is connected with the control unit;
the control unit controls the rotating speed of the power pump according to the gas pressure information obtained by the pressure sensor, so that the output gas pressure is stabilized within a set range.
According to the gas engine test bed gas supply system, the heat exchange device is the vaporizer, and the vaporizer can heat and vaporize LNG through an external heating medium.
The gas engine test stand gas supply system as described above, wherein the fuel storage tank stores liquefied natural gas;
the fuel storage tank is connected with a filling pipe and a blow-down pipe, the filling pipe is used for injecting liquefied natural gas, the blow-down pipe is used for emptying, a flow pipe is arranged in the fuel storage tank and is connected with the filling pipe, and the flow pipe is provided with a plurality of spray heads for adding the liquefied natural gas into the fuel storage tank.
In a second aspect, the invention also provides a control method of the gas supply system of the gas engine test stand, which comprises the following steps:
when the required flow of the gas engine to the gas is lower than the first flow Q1, the control unit controls the first group of power pumps to work;
when the required flow of the gas engine to the gas reaches a first flow Q1, the control unit controls the second group of power pumps to work and closes the first group of power pumps;
when the required flow rate of the gas engine for the gas is increased to a second flow rate Q2, the control unit controls the second group of power pumps to continuously work, and the first group of power pumps are started again;
when the required flow of the gas engine for the gas is reduced to a third flow Q3, the control unit controls the second group of power pumps to continue to work, and the first group of power pumps are closed;
when the required flow rate of the gas engine for the gas is reduced to a fourth flow rate Q4, the control unit controls the second group of power pumps to be closed and the first group of power pumps to be opened;
wherein the maximum flow rate of the first set of power pumps is less than the maximum flow rate of the second set of power pumps, and the maximum flow rate of the first set of power pumps is greater than the minimum flow rate of the second set of power pumps.
The control method of the gas engine test bed gas supply system comprises the steps that the first flow Q1 is larger than the fourth flow Q4;
when the required flow of the gas engine to the gas reaches the first flow Q1 and then is reduced to be smaller than the set range of the first flow Q1, the control unit controls the second group of power pumps to continue to work, and frequent start and stop caused by flow fluctuation are effectively eliminated.
The beneficial effects of the invention are as follows:
1) According to the invention, through the arrangement of the integral air supply system, fuel gas can be provided for the engine to be tested, a plurality of groups of power pumps are arranged in parallel, the control unit regulates and controls the fuel flow requirement of the fuel engine, the fuel flow requirement of the fuel engine is controlled by the control unit, the power pumps with different flow rates are controlled to be turned on or off, the test requirement of the fuel engine is fully met, and the fuel gas engine test device can be suitable for the test requirements of engines of different types.
2) According to the invention, through the arrangement of the temperature sensor, the control unit controls the opening of the second regulating valve according to the gas temperature monitored by the temperature sensor after the heat exchange device, so that the gas temperature is ensured to be in a proper range.
3) According to the invention, through the arrangement of the pressure sensor, the rotating speed of the power pump is controlled according to the gas pressure information obtained by the pressure sensor, so that the output gas pressure is stabilized within a set range.
4) According to the invention, by means of a method of connecting multiple groups of power pumps in parallel, the available operation interval of the pump set is effectively expanded, the small flow demand and the large flow demand can be met, and the test of different power, especially the test of a dual-fuel engine with larger power difference, can be realized.
5) According to the invention, the first flow Q1 is larger than the fourth flow Q4, and when the required flow of the gas engine to the gas falls into the set value range from the first flow Q1, the control unit controls the second group of power pumps to continuously work, so that frequent start and stop caused by flow fluctuation are effectively eliminated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic illustration of a gas engine test stand gas supply system according to one or more embodiments of the present invention.
FIG. 2 is a schematic diagram of a dual pump mode of operation of the present invention with a first power pump in parallel with a second power pump.
In the figure: the mutual spacing or dimensions are exaggerated for the purpose of showing the positions of the various parts, and the schematic illustration is only schematic.
Wherein: 001 is the fuel storage tank, 005 is the vaporizer, 006 is first governing valve, 007 is the buffer tank, 008 is the flowmeter, 009 is the gas valves, 010 is the gas engine, 011 is the muffler, 012 is temperature sensor, 013 is pressure sensor, 014 is the second governing valve, 015 is the control unit, 016 is the water glycol circulation module, 017 is first power pump, 018 is the second power pump.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular forms also are intended to include the plural forms unless the present invention clearly dictates otherwise, and furthermore, it should be understood that when the terms "comprise" and/or "include" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
as described in the background art, the problem that the test bed cannot meet the requirement of the engine on the diversity of the gas flow exists in the prior art, and in order to solve the technical problem, the invention provides a gas supply system of the gas engine test bed.
Example 1
In an exemplary embodiment of the present invention, referring to fig. 1, a gas engine test stand gas supply system includes a fuel tank 001, the fuel tank 001 is connected with a heat exchange device, a plurality of groups of power pumps connected in parallel are connected between the fuel tank 001 and the heat exchange device, wherein the maximum flow rate of one group of power pumps is greater than the maximum flow rate of the other group of power pumps, the maximum flow rate of the one group of power pumps with smaller maximum flow rate is greater than the minimum flow rate of the other group of power pumps, each group of power pumps is provided with at least one power pump, the heat exchange device is connected with a gas valve Group (GVT) 009, the gas valve group 009 is connected with a gas engine 010 for the test, a pipeline connected with the gas valve group 009 is provided with a flow meter 008, and the flow meter 008, the power pumps and the gas engine 010 are respectively connected with a control unit 015.
In this embodiment, two sets of power pumps are arranged in parallel, one power pump is arranged in each set of power pumps, namely a first power pump 017 and a second power pump 018, and in order to meet different air supply requirements, the output flow rates of the 2 pumps are different, but the output flow rate ranges have a certain overlapping interval. For convenience of explanation, the first power pump 017 is a small pump, the output flow rate is 50-500 kg/h, the second power pump 018 is a large pump, the output flow rate is 400-4000 kg/h, and the flow rate range of 400-500 kg/h is the output flow rate overlapping section of the two pumps.
Of course, in other examples, two or more power pumps may be provided for each group of power pumps, and three or more power pumps may be provided as a whole, so that the pump set may be configured to operate when the flow range is entirely satisfied and the overlapping section is included.
The first power pump 017 and the second power pump 018 are high-pressure pumps, and are plunger pumps capable of transporting low-temperature liquid, the whole pump body is immersed in the transported liquid, and the first power pump 017 and the second power pump 018 are driven by frequency converters respectively, and the frequency converters are connected with the control unit 015.
It is understood that a switch is also arranged on the pipeline connected with the fuel storage tank and the parallel power pump for realizing on-off of the pipeline.
In addition, a buffer tank 007 is arranged between the heat exchange device and the gas valve group 009; the flowmeter 008 is connected in the pipeline between the buffer tank 007 and the gas valve group 009, and the buffer tank and the gas valve group connecting pipeline can be further provided with a switch for on-off control of the pipeline.
Set up first governing valve 006 between heat transfer device and the buffer tank 007, first governing valve 006 is connected with control unit 015, and first governing valve 006 is connected with muffler 011, and first governing valve 006 is arranged in carrying out the blowdown to the gas in the pipeline after the test of test bench is accomplished, can reduce the noise when high-pressure gas is empty through the setting of muffler 011.
In this embodiment, the heat exchange device is a vaporizer 005, and the vaporizer 005 can heat and vaporize the LNG through an external heating medium, so that the high-pressure LNG liquid output by the pump is changed into high-pressure natural gas through the vaporizer 005.
The pipeline between the heat exchange device and the buffer tank 007 is provided with a temperature sensor 012 to monitor the temperature of the fuel gas after the heat exchange device, and the temperature sensor 012 is connected with the control unit.
The vaporizer of the heat exchange device is provided with a heating medium, wherein the heating medium is water glycol which is used as the heating medium, and the low-temperature LNG is gasified and heated to a proper temperature.
The gas engine 010 may specifically be a high pressure dual fuel engine.
It is easy to understand that, in order to meet the requirement that stable output temperature can be achieved under different flow rates, a second regulating valve 014 is connected between the inlet and the outlet of the heating medium to be used as bypass, the inlet and the outlet of the heating medium are respectively connected with the water glycol circulation module 016, and the second regulating valve 014 is connected with the control unit;
the control unit 015 controls the opening degree of the second regulating valve 014 according to the gas temperature after the heat exchange device monitored by the temperature sensor 012;
when the temperature sensor detects that the gas temperature is higher than the set value, the control unit controls the second regulating valve 014 to increase the opening degree, so that the water glycol flowing through the heat exchange device is reduced, and the gas temperature is reduced; when the gas temperature is lower than the set value, the control unit 015 controls the second regulating valve 014 to decrease the opening degree, so that the water glycol flowing through the heat exchange device is increased, thereby increasing the gas temperature.
In addition, a pressure sensor 013 is arranged on a pipeline between the heat exchange device and the buffer tank 007 to monitor the gas pressure after the heat exchange device, and the pressure sensor 013 is connected with a control unit 015;
the control unit controls the rotation speed of the power pump according to the gas pressure information obtained by the pressure sensor 013, so that the output gas pressure is stabilized within a set range.
Specifically, the control unit is a PLC controller or other types of controllers, the controllers are provided with hand-touch display screens, the control and the data monitoring are convenient, and the controllers are respectively connected with all switches and all regulating valves.
In some examples, the temperature sensor is disposed on a front side of the conduit proximate to the vaporizer and the pressure sensor is disposed on a rear side.
In addition, the fuel storage tank 001 stores liquefied natural gas, and the fuel storage tank 001 is a horizontal or vertical storage tank; the fuel storage tank 001 is connected with filling pipe and blow-down pipe, and the filling pipe is used for injecting liquefied natural gas, and the blow-down pipe is used for gaseous evacuation, sets up the flow tube in the fuel storage tank 001, and the flow tube is connected with the filling pipe, and the flow tube sets up a plurality of shower nozzles in order to add liquefied natural gas in to the fuel storage tank.
According to the air supply system provided by the embodiment, high-pressure LNG liquid output by the pump is changed into high-pressure natural gas through the vaporizer 005 and then sequentially passes through the buffer tank 007, the flowmeter 008 and the gas valve group 009, the high-pressure dual-fuel engine 010 is finally achieved, a plurality of groups of power pumps are arranged in parallel, the whole fuel can be provided for the gas engine, the control unit regulates and controls the fuel flow requirement of the gas engine, and therefore, the control unit controls the power pumps with different flows to be started or stopped according to the fuel flow requirement of the gas engine, the test requirement of the gas engine is fully met, and the air supply system can be suitable for engines of different types.
The double-pump operation method can effectively expand the available operation interval of the pump set, and can meet the small-flow demand and the large-flow demand. In the above example, the operation interval of the pump set is extended to 50-4500 kg/h. Such a wide flow range cannot be achieved if a single pump is used.
Example two
The embodiment provides a control method of a gas supply system of a gas engine test stand, which comprises the following steps:
when the required flow of the gas engine to the gas is lower than the first flow Q1, the control unit controls the first group of power pumps to work;
when the required flow of the gas engine to the gas reaches a first flow Q1, the control unit controls the second group of power pumps to work and closes the first group of power pumps;
when the required flow rate of the gas engine for the gas is increased to a second flow rate Q2, the control unit controls the second group of power pumps to continuously work, and the first group of power pumps are started again;
when the required flow of the gas engine for the gas is reduced to a third flow Q3, the control unit controls the second group of power pumps to continue to work, and the first group of power pumps are closed;
when the required flow rate of the gas engine for the gas is reduced to a fourth flow rate Q4, the control unit controls the second group of power pumps to be closed and the first group of power pumps to be opened;
wherein the maximum flow rate of the first group of power pumps is smaller than the maximum flow rate of the second group of power pumps, and the maximum flow rate of the first group of power pumps is larger than the minimum flow rate of the second group of power pumps, so that the flow rate interval of the pump group can be expanded based on the first embodiment, the minimum flow rate of the power pump group is 50kg/h of the minimum flow rate of the small pump, and the maximum flow rate is 4500kg/h of the sum of the maximum flow rates of the two pumps.
It can be understood that the control unit controls the required flow of the gas engine test, correspondingly controls the opening or closing of the gas power pumps, monitors the gas flow buffered by the buffer tank according to the flow meter, namely, knows the gas flow entering the fuel engine, and controls the operation of a plurality of groups of power pumps according to the flow of the flow meter.
Specifically, the first flow rate Q1 is greater than the fourth flow rate Q4;
when the required flow of the gas engine to the gas reaches the first flow Q1 and then is reduced to be smaller than the set range of the first flow Q1 (Q4 is smaller than the required flow Q1), the control unit controls the second group of power pumps to continue working, and frequent start and stop caused by flow fluctuation are effectively eliminated.
For example, as shown with reference to fig. 2, assuming that the first flow Q1 is 480kg/h and the fourth flow Q4 is 420kg/h, if the pump flow rate is reduced again to within a set range (480-420 kg/h) below 480kg/h after reaching 480kg/h, the second set of power pump operations is still not switched to the first set of power pump operations, which is very effective in practical use because the negative effects of flow fluctuations can be minimized in view of the fact that the power pump must cause flow fluctuations when switching operations.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The control method of the gas engine test bed gas supply system is characterized in that the control method is based on the gas engine test bed gas supply system, the gas engine test bed gas supply system comprises a fuel storage tank, the fuel storage tank is connected with a heat exchange device, a plurality of groups of power pumps which are connected in parallel are connected between the fuel storage tank and the heat exchange device, wherein the maximum flow rate of one group of power pumps is larger than the maximum flow rate of the other group of power pumps, the maximum flow rate of one group of power pumps with smaller maximum flow rate is larger than the minimum flow rate of the other group of power pumps, each group of power pumps is provided with at least one power pump, the heat exchange device is connected with a gas valve group, the gas valve group is connected with a gas engine for test, a pipeline connected with the gas valve group is provided with a flowmeter, and the flowmeter and the power pumps are respectively connected with a control unit;
the control method comprises the following steps:
when the required flow of the gas engine to the gas is lower than the first flow Q1, the control unit controls the first group of power pumps to work;
when the required flow of the gas engine to the gas reaches a first flow Q1, the control unit controls the second group of power pumps to work and closes the first group of power pumps;
when the required flow rate of the gas engine for the gas is increased to a second flow rate Q2, the control unit controls the second group of power pumps to continuously work, and the first group of power pumps are started again;
when the required flow of the gas engine for the gas is reduced to a third flow Q3, the control unit controls the second group of power pumps to continue to work, and the first group of power pumps are closed;
when the required flow rate of the gas engine for the gas is reduced to a fourth flow rate Q4, the control unit controls the second group of power pumps to be closed and the first group of power pumps to be opened;
wherein the maximum flow rate of the first set of power pumps is less than the maximum flow rate of the second set of power pumps, and the maximum flow rate of the first set of power pumps is greater than the minimum flow rate of the second set of power pumps.
2. The control method of a gas engine test stand gas supply system according to claim 1, wherein the first flow rate Q1 is greater than the fourth flow rate Q4;
when the required flow rate of the gas engine for the gas reaches the first flow rate Q1 and then is reduced to be smaller than the set range of the first flow rate Q1, the control unit controls the second group of power pumps to continue to work.
3. The control method of a gas engine test stand gas supply system according to claim 1, wherein a buffer tank is provided between the heat exchanging device and the gas valve group;
the flowmeter is connected to a pipeline between the buffer tank and the gas valve group.
4. A control method of a gas engine test stand gas supply system according to claim 3, wherein a first regulating valve is provided between the heat exchanging device and the buffer tank, the first regulating valve is connected with the control unit, and the first regulating valve is connected with the muffler.
5. A control method of a gas supply system of a gas engine test stand according to claim 3, wherein a temperature sensor is provided in a pipeline between the heat exchanging device and the buffer tank to monitor the temperature of the gas after the heat exchanging device, and the temperature sensor is connected to the control unit.
6. The control method of the gas engine test stand gas supply system according to claim 5, wherein a second regulating valve is connected between the inlet and the outlet of the heating medium of the heat exchange device, and the second regulating valve is connected with the control unit;
and the control unit controls the opening degree of the second regulating valve according to the temperature of the fuel gas after the heat exchange device is monitored by the temperature sensor.
7. A control method of a gas supply system of a gas engine test stand according to claim 3, wherein a pressure sensor is provided in a pipeline between the heat exchanging device and the buffer tank to monitor the gas pressure after the heat exchanging device, and the pressure sensor is connected to the control unit;
the control unit controls the rotating speed of the power pump according to the gas pressure information obtained by the pressure sensor.
8. The control method of a gas engine test stand gas supply system according to claim 1, wherein the heat exchanging device is a carburetor.
9. A control method of a gas engine test stand gas supply system according to claim 1, wherein the fuel tank stores liquefied natural gas;
the fuel storage tank is connected with a filling pipe and a blow-down pipe.
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