Real gas supply system and real gas flow high and low temperature verification system

Abstract

The utility model discloses a real gas supply system which is characterized by comprising a pure gas module, a mixed gas module and a component analysis module, the pure gas module is provided with a plurality of pure gas output interfaces which are used for outputting combustible gas or / and non-combustible gas and can be opened and closed; the gas mixing module comprises a real gas storage tank which is hermetically communicated with each pure gas output interface, the real gas storage tank is also provided with a real gas output interface which is provided with a control valve and a one-way valve, and the real gas output interface is used for being connected into a verification real gas circulating loop through a tee joint; the outer side wall of the solid gas storage tank is also provided with a component detection interface which is hermetically communicated with the inner cavity; the component analysis module comprises an opening and closing valve, a pressure reducing valve, a one-way valve and a gas chromatograph, and a component detection interface of the solid gas storage tank is sequentially and hermetically communicated with the opening and closing valve, the pressure reducing valve and the one-way valve through a pressure-resistant pipe and then hermetically communicated with a gas detection interface of the gas chromatograph. The utility model further discloses a real gas flow high and low temperature verification system comprising the real gas supply system.

Description

Technical Field

[0001] The utility model belongs to the field of real gas flow verification systems, and in particular relates to a real gas supply system and a real gas flow high and low temperature verification system. Background Art

[0002] Compared with traditional diaphragm gas meters, electronic gas meters equipped with emerging metering technologies such as MEMS and ultrasonic metering modules have obvious advantages in temperature and pressure correction, compact structure, and intelligent expansion, and are gradually gaining popularity in the market.

[0003] However, electronic gas meters exhibit varying metering characteristics under different operating conditions (e.g., varying pressures and temperatures, or when measuring different media such as air, gas, or mixed gases of varying composition). Consequently, the industry requires a solution to accurately assess the metering characteristics and performance of different gas meters under varying operating conditions. This solution can be used to measure metering errors and aid calibration, thereby improving the metering accuracy, stability, and reliability of various gas meters under varying operating conditions.

[0004] The prior art patent document with publication number CN117740120A discloses a method for uncertainty analysis and evaluation of an ultrasonic flowmeter under high temperature and high pressure conditions, comprising the following steps:

[0005] Step 1: By analyzing the working principle of the ultrasonic flowmeter and the flow field and flow pattern of the fluid in the pipeline, determine the input components that affect the mass flow measurement accuracy under high temperature and high pressure working conditions;

[0006] Step 2: Determine the calculation method of the uncertainty introduced by density under high temperature and high pressure by direct and indirect temperature measurement methods;

[0007] Step 3: Through the normal temperature and pressure real flow calibration test combined with the power supply voltage frequency effect test and the upstream disturbance flow effect test, under the condition that the high temperature and high pressure real flow calibration test cannot be carried out, the uncertainty calculation method of the flow calibration coefficient is given;

[0008] Step 4: Determine the uncertainty assessment method for the deformation of the meter body and the acoustic channel geometry factor under high temperature and high pressure through finite element analysis of the meter body and high temperature and high pressure static tests;

[0009] Step 5: Through high-temperature and high-pressure static tests, under the premise of ensuring that the fluid is stationary and the high-temperature temperature is stable, determine the errors introduced by the time terms of test transmission time, time difference, and zero point offset, and use this to calculate the uncertainty introduced by the time term;

[0010] Step 6. Verify the assessment of other uncertainty factors affecting the flowmeter during long-term operation through environmental change tests, transducer installation tests or other tests.

[0011] Step 7: Synthesize the uncertainty analysis and evaluation methods of Step 1 to Step 6 to obtain the final relative uncertainty of mass flow.

[0012] However, the above existing technologies still have the disadvantage that they do not consider the influence of different components of the real-flow gas source on the metering of different types of gas meters. As a result, it is difficult to calibrate and analyze the metering characteristics and metering errors of different types of gas meters when used with different real-flow gas sources.

[0013] Based on this, the applicant considered designing a real gas supply system and a real gas flow high and low temperature calibration system that can flexibly configure the components of the real gas according to the requirements of the calibration working conditions, thereby being able to more realistically simulate the working conditions. Utility Model Content

[0014] In view of the above-mentioned deficiencies in the existing technology, the technical problem to be solved by the present invention is: how to provide a real gas supply system and a real gas flow high and low temperature calibration system that can flexibly configure the components of the real gas according to the requirements of the calibration working conditions, thereby being able to more realistically simulate the working conditions.

[0015] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0016] The solid gas supply system is characterized by comprising a pure gas module, a mixed gas module and a component analysis module;

[0017] The pure gas module has a plurality of openable and closable pure gas output interfaces for outputting combustible gas and / or non-combustible gas;

[0018] The gas mixing module includes a real gas storage tank that is sealed and connected to each of the pure gas output interfaces. The real gas storage tank also has a real gas output interface equipped with a control valve and a one-way valve. The real gas output interface is used to connect to the calibration real gas circulation loop through a three-way connection. The outer wall of the real gas storage tank is also provided with a component detection interface that is sealed and connected to the inner cavity.

[0019] The component analysis module includes an on-off valve, a pressure reducing valve, a one-way valve and a gas chromatograph. The component detection interface of the real gas storage tank is sealed and connected to the on-off valve, the pressure reducing valve and the one-way valve in sequence through a pressure-resistant pipe, and then to the gas detection interface of the gas chromatograph.

[0020] Compared with the existing technology, the advantages of the gas supply system of this technical solution are:

[0021] The system composition is reasonable, and the mixed gas components can be accurately detected through the component analysis module, and then the components of the real gas can be flexibly configured according to the requirements of the calibration working conditions, so as to simulate the working conditions more realistically, help the calibration system obtain more real and valuable calibration data, improve correction accuracy, and enhance measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the principle diagram of the actual gas flow high and low temperature calibration system in this technical solution

[0023] Figure 2 This is a top view of the high and low temperature calibration system for actual gas flow in this technical solution

[0024] Figure 3 Schematic diagram of the three-dimensional structure of the high and low temperature calibration system of the actual gas flow in this technical solution

[0025] Figure 4 A top view of the high and low temperature calibration system for real gas flow in this technical solution (the top and side walls of the standard meter installation room, the meter being tested calibration room, and the control room are hidden)

[0026] Figure 5 for Figure 4 Enlarged view of point I in the middle

[0027] The following are marked in the figure:

[0028] 0 Skid-mounted base:

[0029] 1 Gas supply system: 11 pressure regulating device, 12 pressure regulating module, 13 gas storage tank, 14 gas chromatograph

[0030] 2 Standard meter installation room: 21 standard meter, 22 explosion-proof exhaust fan

[0031] 3. Test room for inspected instruments: 31 for inspected instruments, 32 for explosion-proof exhaust fans

[0032] 4 flow drive control module: 41 fan, 42 sonic nozzle group

[0033] Temperature regulation system:

[0034] 50 heat exchange container

[0035] 51 cooling and heating unit: 510 cooling and heating module, 511 cooling water tank, 512 hot water tank, 513 cooling and heating controller

[0036] 52 air conditioning

[0037] 6 Control Room: 61 Verification Control System

[0038] 7. Verify the actual gas circulation loop

[0039] 8 valves

[0040] 9Explosion-proof vacuum pump DETAILED DESCRIPTION

[0041] The present invention will be described in further detail below with reference to the accompanying drawings.

[0042] like Figure 1 As shown, a real gas flow high and low temperature calibration system includes a calibration real gas circulation loop, in which a real gas supply system, a standard module, a calibration module and a flow drive control module are connected in series through pipeline sealing; it also includes a temperature regulation system and a calibration control system;

[0043] The actual gas supply system is used to continuously output the test gas used in the test process, and an electric control valve is installed on the gas pipeline at the output end;

[0044] The standard module includes a standard table; the verification module includes at least one inspected station connected in series;

[0045] The flow drive control module includes a fan and a flow regulating sonic nozzle group, both of which are speed-adjustable and sealed in series in the test gas circulation loop; the fan is a circulation fan, a centrifugal fan or an axial flow fan; the flow regulating sonic nozzle group is composed of a plurality of critical flow Venturi sonic nozzles connected in parallel and having various flow specifications;

[0046] The temperature control module is used to control the temperature of the gas medium transported in the calibration gas circulation loop and the ambient temperature of the calibration module and the standard module;

[0047] The verification control system is used to control the real gas supply system, the flow drive regulation module and the temperature control module.

[0048] During implementation, the inspected stations include a flowmeter installation station and / or at least two test meter installation stations connected in series. The inspected flowmeter can be a gas turbine flowmeter, a gas rotary flowmeter, an ultrasonic flowmeter, or other gas flowmeter type. The test meter can be an ultrasonic gas meter, a MEMS thermal gas meter, a diaphragm gas meter, or other types. The installation stations for the inspected flowmeter and / or gas meter include flange interface test fixtures and threaded interface test fixtures, which can be adjusted to accommodate flowmeters of different diameters and lengths, as well as gas meters with different thread specifications and interface spacings. They are also equipped with front and rear straight pipe sections. Each standard meter and test meter installation station is equipped with independent pressure and temperature measurement sensors.

[0049] During implementation, the system standard meter is preferably a high-precision three-rotor positive displacement flow meter connected in series. For example, the standard meter can use a rotary flow meter with an accuracy level of less than or equal to 0.2.

[0050] During implementation, on the basis of the high-precision three-rotor positive displacement flowmeter, critical flow Venturi sonic nozzles with various flow specifications can be added to supplement the flow control points of the standard module.

[0051] During implementation, in order to achieve (0.016~160)m 3 / h large flow range, the fan can use a high-power high-pressure variable frequency circulating fan, the circulating fan is air-cooled design, through the comprehensive adjustment of the frequency converter and flow regulator, it can achieve (0.016 ~ 160) m 3 / h range according to the verification requirements to quickly and automatically adjust the flow rate; better meet the realization of a large flow range of working conditions simulation, improve the versatility of the actual gas flow high and low temperature verification system.

[0052] Compared with the existing technology, the advantages of the high and low temperature gas flow test system of this technical solution are:

[0053] 1. The real gas supply system can output any single component (methane, hydrogen, etc. as a medium) or mixed components (mixture of methane, propane, hydrogen or nitrogen, liquefied petroleum gas, etc.), more realistically simulating the working conditions of the gas meter in the present or future actual use (different components, different temperatures, different pressures, different instantaneous flow rates, etc.), making the calibration results more objective and accurate.

[0054] 2. The fan in the flow drive control module can achieve stepless speed regulation and has a larger speed regulation range, thereby achieving a wider range of flow regulation in the circulation flow channel, expanding the applicable scope of calibrating different flow meters / gas meters, and improving practicality.

[0055] 3. The temperature control module can regulate the temperature of the actual gas, thereby better reproducing the temperature conditions of different working conditions and more comprehensively simulating the calibration requirements of temperature environments in different regions.

[0056] 4. The gas supply system has the functions of gas vacuuming, gas circulation, gas replacement and gas venting.

[0057] 5. The actual gas supply system adopts a combination of a high-accuracy standard flow meter and a critical flow Venturi sonic nozzle, which can meet the calibration range requirements of small flow and normal flow.

[0058] 6. The actual gas supply system adopts the measurement performance test under special working conditions such as high and low temperature and non-ideal flow field to obtain the common characteristics of the measurement performance of the flow meter (gas meter) under the actual flow of natural gas and complex working conditions, build a measurement performance evaluation model, and build a compensation mechanism and adaptive correction model for the flow meter under different temperature fields and non-ideal flow field conditions.

[0059] 7. In the gas industry, for the first time, a flow meter (gas meter) complex working condition measurement performance test device with "natural gas actual flow + high and low temperature working conditions" as the core was developed to achieve rapid fluid temperature control and meet the detection needs of flow meters (gas meter) under complex working conditions.

[0060] During implementation, the following electrical signals are collected and processed:

[0061] Verification control signal: Various control signals in the verification system enter the CPU card through AI / AO / DI / DO and other card components. The CPU card communicates with the verification computer through the bus protocol, and the verification software issues verification and control instructions.

[0062] Temperature / pressure / humidity / liquid level / flow instrument signal (usually RS485 or HART signal) acquisition: All measuring instruments such as pressure and temperature of standard rotary flow meters and flow meters / gas meters under test, as well as measuring instruments in safety systems and circulating cooling systems, will directly enter the calibration system acquisition card, and the calibration software will read these signals in real time through digital communication.

[0063] The video and light pulse signals are collected through independent modules.

[0064] Process pipeline selection: The calibration software communicates the current set flow point and flow path selection information to the control system via the Modbus protocol. The control system automatically opens the switch valve on the standard flow path required to open at the flow point in the calibration plan.

[0065] Temperature control: The temperature control system dynamically adjusts the temperature of the calibration medium to the set temperature. The calibrator only needs to set the target temperature for this calibration in the calibration plan. Normally, no human intervention is required.

[0066] Pressure control: Manually adjust the pressure in the loop to the detection pressure.

[0067] Flow control: After the calibration starts, the calibration system automatically adjusts the calibration gas flow in the loop to the flow required for the calibration through the frequency converter and flow regulator.

[0068] During implementation, the actual gas circulation loop being tested can have multiple process lines, each of which can be opened or closed by controlling the electronically controlled valves at the beginning and end of the relevant process lines. Parameters displayed for each process line include: standard instantaneous volume flow rate, operating pressure and temperature, flow / pressure / temperature / humidity instrument status, and individual valve status.

[0069] When the actual gas flow high and low temperature calibration system is in use, the actual gas flow calibration process can be performed.

[0070] The temperature regulation system of the above actual gas flow high and low temperature verification system includes a heat exchange module and a cooling and heating unit;

[0071] The heat exchange module has a sealed cavity for loading cooling / heating medium inside, and the gas circulation loop of the gas flow high and low temperature test system has a gas delivery pipe for heat exchange made of heat-conducting metal material that is sealed and passes through the sealed cavity.

[0072] Among them, the cooling and heating unit is used to circulate the cooling / heating medium into the sealed cavity of the heat exchange module, so that the heat exchange module can exchange heat with the real gas transported in the calibration real gas circulation loop of the real gas flow high and low temperature calibration system to achieve temperature control.

[0073] During implementation, the heat-conducting metal material is stainless steel (304 or 316) or copper.

[0074] Compared with the existing technology, the temperature control system of the actual gas flow high and low temperature verification system in this technical solution has the following advantages:

[0075] 1. The system structure is simple, which makes it easy to arrange and install one or more sets of the system in the calibration real gas circulation loop of the real gas flow high and low temperature calibration system to achieve the needs of one or more levels of temperature stabilization control.

[0076] 2. Because each flow meter installation station and meter installation station are equipped with independent temperature measurement sensors, the data of each temperature measurement sensor can be collected as a feedback signal, and the feedback signal can be used to accurately control the gas temperature in the actual gas circulation loop to achieve a true simulation of various actual gas temperature conditions.

[0077] Wherein, the cooling / heating medium is water;

[0078] The cooling and heating unit includes a cooling and heating module, a cooling water tank and a hot water tank;

[0079] The cooling and heating module includes a compressor, a condenser, a drier, a capillary tube, and an evaporator; the outlet pipe interface of the compressor is sealed and connected to the input end of the condenser, the output end of the condenser is sealed and connected to one end of the drier, the other end of the drier is sealed and connected to one end of the capillary tube, the other end of the capillary tube is sealed and connected to one end of the evaporator, and the other end of the evaporator is connected to the return pipe interface of the compressor; refrigerant is injected into the circulation pipeline of the cooling and heating module;

[0080] The evaporator is fixedly installed in the refrigeration water tank as a whole, and the condenser is fixedly installed in the hot water tank as a whole.

[0081] During implementation, the refrigerant may be any one of R22, R410a or R600a.

[0082] The working principle of the cooling and heating module in this technical solution is:

[0083] The compressor processes the liquid refrigerant entering through the return air pipe into a high-temperature and high-pressure gas. The gas is output from the compressor outlet pipe interface and enters the evaporator. The refrigerant in the evaporator releases heat and changes from liquid to gas. After passing through the drying filter, the gaseous refrigerant is re-compressed into liquid through the capillary tube. The liquid refrigerant expands in the evaporator, absorbs heat, cools, and changes from liquid to gas. The gaseous refrigerant finally re-enters the return air end of the compressor.

[0084] The advantages of using water as the cooling / heating medium in this technical solution are:

[0085] 1. Water is cheap and has low cost of use; water has a large specific heat capacity (4.2×10 3 J / (kg·℃)), good temperature uniformity; and combined with the circulating water pump, lower noise during operation, making the working environment more friendly.

[0086] 2. The water temperature adjustment range is wide (-5 to 100℃), which can meet the gas temperature adjustment range requirements.

[0087] 3. Water has better thermal stability and more stable temperature changes, which is more conducive to precise temperature control and heat preservation.

[0088] Wherein, the heat exchange module is provided on both the real gas input side and the output side of the meter under test in the real gas flow high and low temperature test system;

[0089] The heat exchange module includes a heat exchange container and a circulating water pump; the heat exchange container has the sealed cavity inside; the outer wall of the heat exchange container is also provided with a circulating water inlet and a circulating water outlet that are sealed and connected to the interior of the heat exchange container;

[0090] The output port of the circulating water pump is sealed and connected to the circulating water inlet, and the input port and the circulating water outlet of the circulating water pump are respectively sealed and connected to the refrigeration water tank and the hot water tank through a three-way valve.

[0091] Because the real gas flow high and low temperature calibration system has a calibration real gas circulation loop, the heat exchange module is provided on the real gas input side and output side of the standard meter and the real gas input side and output side of the meter being tested in the real gas flow high and low temperature calibration system. The heat exchange module on the input side can effectively regulate the temperature of the real gas entering the standard meter and the meter being tested; the heat exchange module on the output side can effectively regulate and maintain the stability of the temperature of the real flow in the calibration real gas circulation loop, so as to better realize precise temperature control.

[0092] During implementation, in this technical solution: the circulating water pump adopts a water pump frequency conversion controller to frequency control the water pump speed, so as to improve the regulation rate and constant temperature accuracy; at the same time, it also includes a cooling and heating controller, and the cooling and heating controller is connected to the temperature measurement sensor signal installed on the input side pipeline of each flow meter installation station and the meter installation station in the real gas flow high and low temperature calibration system. The cooling and heating controller is also connected to the compressor, water pump frequency conversion controller and three-way valve control to achieve precise temperature control of the real gas.

[0093] Among them, the temperature control system also includes a standard meter installation room and a tested meter calibration room, which are independent of each other, equipped with doors for personnel to enter and exit, and each equipped with air conditioning; the standard meter installation room is provided with a pipeline section for the installation of the standard meter and the heat exchange module; the tested meter calibration room is provided with a pipeline section for the installation of the tested meter and the heat exchange module.

[0094] After setting up the above-mentioned independent standard meter installation room and test meter calibration room with air conditioning and door structure, the indoor air environment can be temperature-controlled by air conditioning, so that the temperature of the indoor air is close to the temperature of the gas in the calibration real air circulation loop, thereby further reducing the temperature difference between the air outside the calibration real air circulation loop and the real flow inside, and realizing more precise control of the temperature of the gas in the calibration real air circulation loop.

[0095] During implementation, the refrigerated water tank may be a tank body with a thermal insulation layer installed on the outside.

[0096] A real gas flow verification control system, comprising:

[0097] A host module, comprising a processor and a memory, an input / output module, a power module, and a communication module electrically connected to corresponding interfaces on the processor;

[0098] The parameter acquisition module includes a real gas parameter collector, a pulse isolation amplifier, and a pulse / time measurement module; the real gas parameter collector is used to collect the temperature, pressure, and instantaneous flow of the real gas in the real gas circulation loop, and its output side is connected to the input / output module signal; the input side of the pulse isolation amplifier is used to connect to the standard meter and the meter under test signal, and the output side is used to connect to the input side signal of the pulse / time measurement module; the output side of the pulse / time measurement module is connected to the input / output module signal;

[0099] The electric control actuator includes a relay, an electric control valve, a flow drive control module and a temperature control module, the control side interface of which is connected to the corresponding interface signal on the input / output module.

[0100] Compared with the existing technology, the advantages of the gas flow verification control system of this technical solution are:

[0101] 1. The entire system adopts a modular design, which makes it easier to install, maintain and use.

[0102] 2. The pulse signal collected during verification is accurate, which can achieve higher flow measurement accuracy and ensure the accuracy of verification and control.

[0103] During implementation, the pulse / time measurement module uses the iTS-PD high-precision multi-channel pulse / time detection unit. The frequency acquisition range of this detection unit can cover (0~10)kHz, and the acquisition accuracy is better than 0.001%. It can simultaneously measure the instantaneous signals of up to 8 standard meters and the meter being tested. Each standard flow meter has an independent measurement channel, supporting up to 32 channels of detection.

[0104] In this technical solution, the pulse signal acquisition process is as follows: the pulse signals from the standard rotary flowmeter and the flowmeter under test undergo photoelectric shaping and amplification before entering the pulse / frequency / time acquisition system. The pulse signals from both the test meter and the standard flowmeter are independently and continuously fed into the pulse counter and continuously read by the host module. The pulse data acquisition module utilizes "dual timing processing" technology (first measuring a time period, then performing high-precision timing processing within that period for even higher accuracy) to achieve higher flow measurement accuracy, ensuring precision in calibration and control.

[0105] Wherein, the flow drive control module includes a fan which is connected in series with the air duct seal in the test gas circulation loop and can be speed-adjustable, and the fan is a circulation fan, a centrifugal fan or an axial flow fan;

[0106] The temperature control module is used to regulate the temperature of the gas medium transported in the calibration gas circulation loop and the ambient temperature of the calibration module and the standard device module.

[0107] The fan in the flow drive control module can achieve stepless speed regulation and has a larger speed regulation range, thereby achieving a wider range of flow regulation in the circulation flow channel, expanding the scope of application for calibrating different flow meters / gas meters, and improving practicality.

[0108] The temperature control module can regulate the temperature of the actual gas, thereby better reproducing the temperatures of different working conditions and more comprehensively meeting the calibration requirements of different temperature conditions.

[0109] Among them, the actual gas flow calibration control system also includes a control room. The overall appearance of the control room is a box-type structure and has a door structure for people to enter and exit. The control room is fixedly installed with air conditioning, fresh air system and power distribution cabinet; the host module is arranged in the control room.

[0110] The setting of the control room enables operators to work independently in the control room, effectively avoiding sharing the same space with the real gas circulation loop of the real gas test, and effectively reducing the harm of noise and air environment to the human body.

[0111] The top wall and the interlayers of the surrounding side walls of the control room are provided with heat-insulating layers and the outer sides are made of hard metal.

[0112] During implementation, the hard metal may be high carbon steel or stainless steel.

[0113] This can make the side walls of the control room stronger and more explosion-proof.

[0114] A circle of grounding flat irons is buried in the ground around the bottom of the control room, and the grounding flat irons are electrically connected to the metal frame structure of the control room through a metal conductor.

[0115] In this way, the metal frame of the control room can be fully grounded through the grounding flat iron, effectively avoiding the adverse effects caused by lightning strikes or static electricity, and better ensuring safety.

[0116] like Figures 1 to 4 The figure shows the actual gas supply system in this technical solution, including a pure gas module, a mixed gas module and a component analysis module;

[0117] The pure gas module has a plurality of openable and closable pure gas output interfaces for outputting combustible gas and / or non-combustible gas;

[0118] The gas mixing module includes a real gas storage tank that is sealed and connected to each of the pure gas output interfaces. The real gas storage tank also has a real gas output interface equipped with a control valve and a one-way valve. The real gas output interface is used to connect to the calibration real gas circulation loop through a three-way connection. The outer wall of the real gas storage tank is also provided with a component detection interface that is sealed and connected to the inner cavity.

[0119] The component analysis module includes an on-off valve, a pressure reducing valve, a one-way valve and a gas chromatograph. The component detection interface of the real gas storage tank is sealed and connected to the on-off valve, the pressure reducing valve and the one-way valve in sequence through a pressure-resistant pipe, and then to the gas detection interface of the gas chromatograph.

[0120] Compared with the existing technology, the advantages of the gas supply system of this technical solution are:

[0121] The system composition is reasonable, and the mixed gas components can be accurately detected through the component analysis module, and then the components of the real gas can be flexibly configured according to the requirements of the calibration working conditions, so as to simulate the working conditions more realistically, help the calibration system obtain more real and valuable calibration data, improve correction accuracy, and enhance measurement accuracy.

[0122] During implementation, there are mainly two types of gas chromatographs: online and offline. Because the real gas circulation loop for calibration uses a high-pressure gas cylinder group to supply gas, the gas components are relatively simple, so an offline chromatograph is used.

[0123] Wherein, the combustible gas is natural gas and / or hydrogen; the non-combustible gas is at least one of air, nitrogen or carbon dioxide.

[0124] During implementation, the non-combustible gas source may be derived from a corresponding medium-pressure or high-pressure gas storage cylinder.

[0125] Wherein, when the combustible gas is natural gas, the corresponding output interface is the output interface of the gas pressure regulating box.

[0126] The gas pressure regulating box can adjust the higher pressure gas delivered from the upstream pipeline to a lower and stable pressure suitable for use by downstream user equipment.

[0127] Wherein, when the combustible gas is hydrogen, the corresponding hydrogen output interface is a medium-pressure hydrogen cylinder or a high-pressure hydrogen cylinder.

[0128] Medium-pressure hydrogen cylinders (pressure between 10-30MPa) and high-pressure hydrogen cylinders (pressure greater than 30MPa).

[0129] Among them, the pure gas module and the mixed gas module are both installed in the open air and fixed as a whole at one end of the length direction of the long skid-mounted base. The other end of the skid-mounted base in the length direction is equipped with a control room, and the middle part of the skid-mounted base in the length direction is equipped with a standard meter installation room and a calibration room for the meter under test.

[0130] In this way, the gas supply system can be kept away from the control room, improving the safety of the control room in emergency situations.

[0131] like Figures 2 to 4 As shown, the safety system of the actual gas flow high and low temperature calibration system includes a standard meter installation room and a calibration room for the meter to be tested, which are independent of each other, equipped with doors for personnel to enter and exit, and each equipped with air conditioning; the standard meter installation room is provided with a pipeline section for the installation of the standard meter; the calibration room for the meter to be tested is provided with a pipeline section for the installation of the meter to be tested; the standard meter installation room and the calibration room for the meter to be tested are both fixedly installed with combustible gas sensors and alarms.

[0132] Compared with the existing technology, the safety system of the gas flow high and low temperature verification system of this technical solution has the following advantages:

[0133] 1. The standard meter and the meter being tested in the actual gas flow high and low temperature calibration system are installed in two independent rooms to achieve spatial isolation, avoid the impact of gas leakage in a single place on the equipment in the entire space, and improve safety.

[0134] 2. The standard meter and the meter under test are installed in two independent rooms. The space in the two independent rooms is relatively smaller. Once a slight leak occurs, its concentration can be higher, which is easier to be detected by the combustible gas sensor in the room and trigger the alarm, thereby improving the level of safe operation.

[0135] During implementation, the alarm may be an audible and visual alarm.

[0136] Among them, explosion-proof exhaust fans are fixedly installed on the side walls of the standard meter installation room and the meter under test calibration room respectively, and the start control module of the explosion-proof exhaust fan is controllably connected to the trigger signal output interface of the combustible gas alarm.

[0137] In this way, the explosion-proof exhaust fan can be started immediately when the combustible gas alarm sends a detection signal to quickly discharge the indoor combustible gas to the outside, reduce the concentration of combustible gas, and avoid causing an explosion.

[0138] Among them, the power supply circuits of the high-voltage cabinet and the control cabinet of the actual gas flow high and low temperature verification system are respectively provided with relays and circuit breakers connected to the trigger signal output of the combustible gas alarm.

[0139] Therefore, when the combustible gas alarm detects the concentration limit alarm, the power supply circuit of the high-voltage cabinet and the control cabinet can be automatically disconnected, effectively avoiding the generation of arcs (electric sparks) and effectively avoiding explosions.

[0140] Wherein, the walls, ceiling and floor of the standard meter installation room and the meter under test calibration room are respectively provided with a heat insulation layer; the heat insulation layer is at least one of rock wool, glass wool or aerogel felt.

[0141] During implementation, the thermal insulation layer is a sandwich layer between the wall, roof and floor.

[0142] The above thermal insulation layer not only has good thermal insulation effect, but also has certain energy absorption, tensile strength and explosion-proof properties, which can reduce the external impact force caused by the explosion when extreme conditions occur.

[0143] Among them, a circle of grounding flat iron is buried in the ground around the bottom of each of the standard meter installation room and the meter under test calibration room. The grounding flat iron is electrically connected to the metal frame in the room and the outer surface of the pipe body in the room through a metal conductor.

[0144] In this way, the metal frames of the standard meter installation room and the meter under test calibration room as well as the pipes in the room can be fully grounded through the grounding flat iron, effectively avoiding the adverse effects caused by lightning strikes or static electricity and better ensuring safety.

[0145] The cooling water tank is a flat rectangular structure and is fixedly mounted on the common outer top surface of the standard meter installation room and the meter under test calibration room.

[0146] During implementation, the side walls of the refrigerated water tank are made of corrosion-resistant thin metal (such as 1.5-3.5mm thick 304 or 316 stainless steel). The outer surface of the refrigerated water tank has a thermal insulation layer, which is aluminum foil rubber-plastic thermal insulation cotton. The aluminum foil rubber-plastic thermal insulation cotton not only has good thermal insulation effects, but the aluminum foil also has a radiation-proof effect, which better avoids the interference of electromagnetic radiation on the room. At the same time, the aluminum foil rubber-plastic thermal insulation cotton itself is flexible and can also absorb energy during explosion impact, thereby reducing the impact force of the explosion and reducing the degree of explosion damage.

[0147] In this way, the cooling water tank will not only not take up additional floor space, reducing the floor space required for arranging the temperature control system; at the same time, it can also make full use of the idle space on the top of the standard meter installation room and the calibration room of the meter being tested to fully expand the volume of the cooling water tank; after expanding the volume of the cooling water tank, the water with a larger capacity can use the low-cost electricity at night with a lower unit price to cool and store more energy, which can be released during the peak power consumption time during the day (by regulating and lowering the actual gas temperature for calibration), helping to reduce electricity costs and calibration expenses.

[0148] In addition, placing the cooling water tank on the common outer top surface of the standard meter installation room and the meter under test calibration room can also absorb the energy of the combustible gas explosion in extreme cases; after the cooling water tank is damaged by the explosion and a hole is formed, the cooling water in it can flow out of the hole to cool down and extinguish the fire, playing a certain protective role and preventing the fire from spreading.

[0149] The above are only preferred implementations of the present invention. It should be pointed out that various modifications and improvements made by those skilled in the art without departing from the present technical solution should also be deemed to fall within the scope of protection required by the claims.

Claims

1. Gas supply system, characterized by: Including pure gas module, mixed gas module and component analysis module; The pure gas module has a plurality of openable and closable pure gas output interfaces for outputting combustible gas and / or non-combustible gas; The gas mixing module includes a real gas storage tank that is sealed and connected to each of the pure gas output interfaces. The real gas storage tank also has a real gas output interface equipped with a control valve and a one-way valve. The real gas output interface is used to connect to the calibration real gas circulation loop through a three-way connection. The outer wall of the real gas storage tank is also provided with a component detection interface that is sealed and connected to the inner cavity. The component analysis module includes an on-off valve, a pressure reducing valve, a one-way valve and a gas chromatograph. The component detection interface of the real gas storage tank is sealed and connected to the on-off valve, the pressure reducing valve and the one-way valve in sequence through a pressure-resistant pipe, and then to the gas detection interface of the gas chromatograph.

2. The solid gas supply system according to claim 1, characterized in that: The combustible gas is natural gas and / or hydrogen; the non-combustible gas is at least one of air, nitrogen or carbon dioxide.

3. The solid gas supply system according to claim 2, characterized in that: When the combustible gas is natural gas, the corresponding output interface is the output interface of the gas pressure regulating box.

4. The solid gas supply system according to claim 2, characterized in that: When the combustible gas is hydrogen, the corresponding hydrogen output interface is a medium-pressure hydrogen cylinder or a high-pressure hydrogen cylinder.

5. The solid gas supply system according to any one of claims 1 to 4, characterized in that: The pure gas module and the mixed gas module are both installed in the open air and are fixedly mounted as a whole on one end of the length direction of the long skid-mounted base. The other end of the skid-mounted base in the length direction is equipped with a control room, and the middle part of the skid-mounted base in the length direction is equipped with a standard meter installation room and a calibration room for the meter under test.

6. A real gas flow high and low temperature calibration system, comprising the real gas supply system according to any one of claims 1 to 4.

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