CN212819205U - Hydrogen energy source utilization gas mixing system - Google Patents
Hydrogen energy source utilization gas mixing system Download PDFInfo
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- CN212819205U CN212819205U CN202021681860.3U CN202021681860U CN212819205U CN 212819205 U CN212819205 U CN 212819205U CN 202021681860 U CN202021681860 U CN 202021681860U CN 212819205 U CN212819205 U CN 212819205U
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Abstract
The utility model discloses a hydrogen energy utilization gas mixing system relates to renewable energy and utilizes technical field, include: the PLC control cabinet is provided with a touch screen and is used for displaying the inlet and outlet pressure, the outlet hydrogen content and the valve state of equipment, displaying the opening size of the regulating valve, setting parameters, inquiring historical alarm and inquiring a data report; and the industrial personal computer is communicated with the PLC control cabinet and is used for automatically controlling the field gas mixing device and safely cutting off protection. The utility model discloses the natural gas test equipment that adds hydrogen of development is used for gas to add hydrogen experimental, and the natural gas utilizes the pipeline gas, and the hydrogen gas source is hydrogen long-tube trailer, and import pressure is 20MPa, and the two-stage decompression, and the proportion of adding hydrogen is 3% -20%, and equipment has put into operation for a long period of time for experimental result of use of mixing the hydrogen natural gas, through constantly perfecting and the innovation to equipment, has reached the anticipated target, and equipment technology is advanced, the operation is reliable.
Description
Technical Field
The utility model discloses a renewable energy utilizes technical field, especially relates to a hydrogen energy utilizes gas mixing system.
Background
At present, the hydrogen energy utilization industry can be rapidly developed and strengthened, the overall development of new energy industry can be promoted by creating a hydrogen energy industry chain, a high-end application demonstration of new energy is built, and an energy consumption structure is comprehensively upgraded. The hydrogen produced by electrolyzing renewable energy and the surplus hydrogen produced under the full-load operation condition of a hydrogenation station are injected into a natural gas pipe network to form the hydrogen-doped natural gas, and the hydrogen-doped natural gas is conveyed to a terminal user through the pipe network, so that a hydrogen energy industrial chain of mixing, conveying and utilizing is realized, and the deep fusion of a power grid and a gas network is promoted.
The natural gas hydrogen-mixing technology can not only improve the utilization rate of renewable energy sources, but also make a contribution to reducing pollutants generated by the combustion of a natural gas terminal and solving the problem of atmospheric pollution.
The natural gas hydrogen-loading technology is commercially applied in a plurality of countries in Europe, and a great deal of operation experience is accumulated. In the prior art, the whole technical level of natural gas hydrogen mixing is still in a test verification stage, and no unified standard exists in the aspects of material compatibility, operation and control safety, hydrogen mixing and gas mixing process advancement, equipment reliability and the like.
The gas mixed hydrogen belongs to a novel device system at home and abroad, and a plurality of data indexes need reliable test verification.
Through the above analysis, the problems and defects of the prior art are as follows: (1) the existing natural gas hydrogen-mixing equipment has poor operation effect; and a double-gas mixing follow-up flow gas mixing scheme is not adopted, so that the technical performance is unreliable, the process operation part is stable, and the safety control level is low.
(2) In the prior art, the front-end hydrogen high-pressure treatment is not added, the materials of hydrogen pipeline parts are not reasonably selected, the flow and component coordination and control performance is poor, the gas mixing uniformity effect is poor, the signal feedback is slow and the like, so that the gas mixing device cannot completely meet the practical application.
The difficulty in solving the above problems and defects is: (1) the hydrogen is transported by a high-pressure long-tube trailer, the hydrogen has special properties, the influence of hydrogen corrosion, hydrogen bulge, hydrogen brittleness and the like is easily generated on a carbon steel pipeline, the mature experience has no influence below 3 percent of hydrogen content, the hydrogen mixing ratio required by a test device is up to 20 percent, the overall cost of equipment is limited, and the material selection is carefully considered.
(2) The hydrogen is transported to a station room through a long pipe prying vehicle, the pressure of the incoming gas reaches 20MPa, the using pressure is only 0.25-0.3MPa, the pressure difference is very high, the volume of the hydrogen is smaller than that of other molecules in natural gas, the leakage rate is generally 4-5 times faster than that of methane, and the rate is higher when the pressure is high, so that the method is very important for preventing the leakage of the hydrogen molecules in a pipeline, and the reasonable selection of hydrogen pipeline parts such as a high-pressure valve, a filter, a pressure regulator, a pipe fitting, a sealing element and the like is very critical.
(3) The nature difference of hydrogen and methane is great, especially in combustion performance, if two kinds of gas mixture uniformity is low, or the layering phenomenon appears in the rear end pipeline, can cause the gas mixture magnificent number and the combustion potential disorder, two kinds of gas all belong to flammable explosive medium, lead to hydrogen equipment's safe in utilization easily, so the gas mixing uniformity that the static mixer of core gas mixing part must reach more than 98%, it is even to ensure to mix the gas, also must guarantee simultaneously that the mixing ratio of two kinds of washings is accurate in the control principle, the reaction is quick, safety interlock is reliable.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems existing in the related art, the embodiment of the utility model discloses a hydrogen energy source utilizes gas blending system.
This hydrogen energy source utilizes gas blending system includes:
the PLC control cabinet is provided with a touch screen and is used for displaying the inlet and outlet pressure, the outlet hydrogen content and the valve state of equipment, displaying the opening size of the regulating valve, setting parameters, inquiring historical alarm and inquiring a data report;
and the industrial personal computer is communicated with the PLC control cabinet and is used for automatically controlling the field gas mixing device and safely cutting off protection.
Further, this hydrogen energy source utilizes gas blending system still includes:
the hydrogen pipeline device is characterized in that source hydrogen enters a gas mixing pipeline, passes through an inlet ball valve, a pneumatic stop valve and a filter, measures the hydrogen flow through a flowmeter, regulates the hydrogen consumption through an adjusting valve and then enters the gas mixing device through an outlet ball valve;
in the natural gas pipeline device, source natural gas enters a gas mixing pipeline, passes through an inlet ball valve and a filter cut-off valve, is subjected to pressure regulation and metering, then passes through an adjusting valve to an outlet ball valve, and enters the gas mixing device;
the flow value after the detection equipment of the gas mixing outlet is mixed and temperature and pressure compensated controls the opening of the regulating valves on the natural gas and hydrogen pipelines together, the hydrogen volume flow is controlled, the on-line regulation and automatic following of the hydrogenation amount are carried out, and the natural gas and hydrogen proportioning is realized.
Further, the hydrogen pipeline apparatus includes: and the hydrogen high-pressure hose is connected with a hydrogen pressure regulating pipeline through a vent valve, a manual high-pressure ball valve and a pressure transmitter.
Further, the hydrogen gas pressure regulating pipeline is communicated with the gas gathering pipeline through an inlet ball valve, a pneumatic emergency cut-off valve, a high-precision high-pressure filter, a first-level pressure regulator, a hydrogen pressure gauge and a first adjusting outlet valve, the gas gathering pipeline is provided with a pressure transmitter, a bypass manual ball valve, a safety relief valve, a hydrogen root valve and a hydrogen bypass valve group, hydrogen is communicated with a second-level pressure regulating pipeline through a gathering pipe, the hydrogen second-level pressure regulating pipeline is provided with two paths, the inlet ball valve, the second-level pressure regulator, the hydrogen pressure gauge, a hydrogen flowmeter, a regulating valve and the second adjusting outlet valve are arranged in each path of line and enter the gas gathering pipeline, the gas gathering pipeline is provided with the pressure transmitter, the hydrogen temperature gauge, the temperature transmitter, the safety relief valve, the root valve and the.
Further, the natural gas line apparatus includes:
the inlet pipeline is internally provided with a natural gas heat value analyzer, a pressure transmitter, a temperature transmitter, a natural gas pressure gauge and a natural gas thermometer, then natural gas enters the pressure regulating metering pipeline and is divided into two paths, each path of inlet is provided with a manual ball valve, a high-precision filter, a pneumatic emergency cut-off valve, a pressure regulator, a natural gas pressure gauge, a natural gas flowmeter, a regulating valve and an outlet manual ball valve, the natural gas flowmeter and the outlet manual ball valve enter the gas gathering pipeline, and the gas gathering pipeline is provided with the pressure transmitter, a safety relief valve, a natural gas root valve and a natural gas.
Further, the gas mixing device is provided with a static mixer for communicating natural gas and hydrogen, a flow guide pipe is arranged at a hydrogen inlet, and a plurality of groups of metal plate corrugated packing vortex generators in the static mixer
Further, set up instrument valve and differential pressure meter on the static mixer, static mixer below low point sets up the blowoff valve, static mixer rear pipeline is equipped with methane and hydrogen component on-line analyzer, the static mixer rear is pressure transmitter, temperature transmitter, mixed gas pipeline manometer, mixed gas thermometer, export manual ball valve, is equipped with combustible gas leakage alarm probe and the interlocking explosion-proof fan of real-time supervision gas leakage in the box.
Further, a methane analyzer and a hydrogen analyzer are installed at the outlet of the gas mixing device.
Further, the PLC control cabinet automatically controls according to the acquired flow value and the gas concentration; and monitoring the outlet pressure and the outlet gas concentration in real time in the gas mixing process, and setting the required linkage protection according to the downstream hydrogen requirement when the outlet gas concentration reports low and high and the outlet pressure reports low and high.
The utility model discloses a technical scheme that embodiment provided can include following beneficial effect:
the utility model discloses the natural gas test equipment that adds hydrogen of development is used for gas to add hydrogen experimental, and the natural gas utilizes the pipeline gas, and the hydrogen gas source is hydrogen long-tube trailer, and import pressure is 20MPa, and the two-stage decompression, and the proportion of adding hydrogen is 3% -20%, and equipment has put into operation for a long period of time for experimental result of use of mixing the hydrogen natural gas, through constantly perfecting and the innovation to equipment, has reached the anticipated target, and equipment technology is advanced, the operation is reliable.
The on-line blending technology with the dynamically adjustable natural gas hydrogen mixing ratio adopts an advanced and reliable double-gas blending follow-up flow gas mixing scheme, has mature application in the fields of replacing natural gas and blending high-calorific-value gas with LPG mixed gas to improve the calorific value and the like, and has the characteristics of reliable technical performance, advanced process, stable work, high safety control level and the like.
In the follow-up flow gas mixing process, natural gas serves as a driving gas source, hydrogen serves as a driven gas source, the driven gas source automatically follows the dynamic adjustment valve opening according to the flow and component change of the driving gas source, and therefore the stable gas mixing proportion of the two gases is achieved, the mixing precision is high, the whole equipment is skid-mounted, the stainless steel box with the heat preservation and noise reduction functions is arranged outside, the equipment is compact and attractive, and installation and migration are facilitated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is an overall view of a hydrogen energy utilization gas blending system according to an embodiment of the present invention.
Fig. 2 is a schematic view of a hydrogen pipeline according to an embodiment of the present invention.
In fig. 2: 1. a long tube trailer; 2. gas mixing skid-mounted equipment; 3. a hydrogen high pressure hose; 4. an atmospheric valve; 5. A manual high pressure ball valve; 6. a pressure transmitter; 7. an inlet ball valve; 8. a pneumatic emergency shut-off valve; 9. a high-precision high-pressure filter; 10. a first stage voltage regulator; 11. a pressure gauge; 12. an outlet regulating valve; 13. a pressure transmitter; 14. bypassing the manual ball valve; 15. a valve; 16. a safety blow-off valve; 17. a bypass valve set; 18. an inlet ball valve; 19. a secondary voltage regulator; 20. a hydrogen pressure gauge; 21. a flow meter; 22. adjusting a valve; 23. adjusting an outlet valve; 24. a pressure transmitter; 25. a hydrogen thermometer; 26. a temperature transmitter; 27. two bypass valve banks; 28. two valves; 29. a safety blow-off valve; 30. a check valve.
Fig. 3 is a schematic diagram of a natural gas pipeline section provided by an embodiment of the present invention.
In fig. 3: 31. a natural gas calorific value analyzer; 32. a pressure transmitter; 33. a temperature transmitter; 34. a pressure gauge; 35. a natural gas thermometer; 36. a manual ball valve; 37. a high-precision filter; 38. a pneumatic emergency shut-off valve; 39. a voltage regulator; 40. a natural gas pressure gauge; 41. a flow meter; 42. adjusting a valve; 43. an outlet manual ball valve; 44. a pressure transmitter; 45. a natural gas bypass valve bank 46 and a natural gas root valve; 47. a safety relief valve.
Fig. 4 is a schematic view of a portion of a mixed gas pipeline according to an embodiment of the present invention.
In fig. 4: 49. a static mixer; 50. an instrument valve; 51. a differential pressure gauge; 52. a flow guide pipe; 53. a plurality of groups of metal plate corrugated packing vortex generators; 54. methane; 55. an on-line analyzer for hydrogen components; 56 a pressure transmitter; 57. a temperature transmitter; 58. a mixed gas pipeline pressure gauge; 59. a mixed air thermometer; 60. An outlet manual ball valve; 62. a blowoff valve; 63. a combustible gas leakage alarm probe; 64. explosion-proof fan.
Fig. 5 is a schematic view of a hydrogen flame arrestor provided by an embodiment of the present invention.
In fig. 5: 61. a hydrogen flame arrester.
Fig. 6 is a schematic view of a natural gas flame arrestor provided by an embodiment of the present invention.
In fig. 6: 48. a natural gas flame arrester.
Fig. 7 is a schematic view of the assembly of the hydrogen pipeline according to the embodiment of the present invention.
Fig. 8 is a schematic view of the assembly of the natural gas pipeline provided by the embodiment of the present invention.
Fig. 9 is a schematic view of the assembly of the hybrid tracheal line portion according to the embodiment of the present invention.
In fig. 7, 8, 9: n1 NG inlet; an outlet of the mixed gas of N2; n3 purge outlet 1; n4 purge outlet 2; an N5 hydrogen inlet; an N6 reserved port; n7 gauge tuyere; n8 drain outlet (Natural gas)
Wherein, the material of the external interface flange of the mixed gas outlet is 20#, which is convenient for the connection of the opposite pipeline.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The utility model discloses a hydrogen and natural gas ratio control method of hydrogen energy utilization gas mixing system that the embodiment provided, include:
(1) the pneumatic emergency cut-off valve on the hydrogen and natural gas pipeline is interlocked with the automatic detection alarm for the pressure of the inlet and the outlet of the two parties, the temperature transmitter and the combustible gas leakage, when the numerical value exceeds the limit, the cut-off valve automatically closes and cuts off the gas source, and the system stops working to prevent the leakage and the accumulation of the over-limit hydrogen and the combustible gas.
(2) The pressure transmitter at the outlet of the natural gas and hydrogen pipeline monitors that the pressure reaches a required range after the natural gas and hydrogen are adjusted at any time, and the numerical value exceeds a certain range, so that the control system gives an alarm to prompt an operator to adjust the working pressure of the matching of the pressure regulator and the regulating valve.
(3) The hydrogen section flowmeter controls the opening and closing degree of the hydrogen outlet regulating valve, compares the natural gas flow value, and controls the hydrogen flow according to the matching requirement to meet the requirement of preliminary gas mixing matching.
(4) The mixed gas outlet methane analyzer and the hydrogen analyzer are matched with the flow value after temperature and pressure compensation to jointly control the opening degree of the regulating valves on the natural gas pipeline and the hydrogen pipeline, the hydrogen volume flow is accurately and quickly controlled, the on-line regulation and automatic following of the hydrogenation amount are realized, and the accurate ratio of the natural gas to the hydrogen is achieved.
The utility model provides an implement control system of control method, control system includes:
the PLC control cabinet is provided with a touch screen and is used for displaying the inlet and outlet pressure, the outlet hydrogen content and the valve state of the equipment and displaying the opening size of the regulating valve; setting parameters; querying a historical alarm; inquiring a data report;
and the industrial personal computer is used for automatic control and safety cut-off protection of the field gas mixing device.
Preferably, the whole gas mixing process PLC control cabinet automatically controls according to the acquired flow value and gas concentration; and monitoring the outlet pressure and the outlet gas concentration in real time in the gas mixing process, and setting the required linkage protection according to the downstream hydrogen requirement when the outlet gas concentration reports low and high and the outlet pressure reports low and high.
As shown in fig. 1-6, a system for blending fuel gas by using hydrogen energy provided by the embodiments of the present disclosure includes:
(1) hydrogen pipeline
A long-tube trailer (with the highest pressure of 20MPa) 1 is loaded with hydrogen and transported to a station room and beside a gas mixing skid-mounted device 2, and the hydrogen enters a hydrogen pressure regulating pipeline in a gas mixing device through connecting a hydrogen high-pressure hose 3, an air release valve 4 (for releasing pressure before removing the hose), a manual high-pressure ball valve 5 (a switch valve) and a pressure transmitter 6 (for online pressure detection and signal remote transmission linkage). The hydrogen primary pressure regulating pipeline is provided with two paths (one path is opened and one path is spare), each path is provided with 7 inlet ball valves (manual opening and closing switching), 8 pneumatic emergency cut-off valves (the valves are of a fault closing type and are controlled by a PLC control cabinet of the device system in an interlocking way), 9 high-precision high-pressure filters (filtering impurities such as dust, fine particles and the like), 10 primary pressure regulators (stabilizing the pressure of a follow-up air source), 11 hydrogen pressure gauges (displaying the pressure after regulation), 12 primary pressure regulating outlet valves (manual opening and closing switching) enter a gas gathering pipeline, the gas gathering pipeline is provided with 13 pressure transmitters (pressure on-line detection and signal remote transmission linkage), 14 bypass manual ball valves (capable of being connected with a hydrogen pipe network medium-pressure air source), 16 safety relief valves, 15 hydrogen root valves and 17 hydrogen bypass valve groups (safety evacuation and automatic relief), hydrogen enters a secondary pressure regulating pipeline through a gathering pipe, and the hydrogen secondary pressure regulating pipeline is provided with two paths (, each line is provided with an 18-inlet ball valve (manual on-off switching), a 19-stage pressure regulator (stable follow-up gas source pressure which is slightly higher than the active gas source pressure), a 20-hydrogen pressure gauge (displaying adjusted pressure), a 21-hydrogen flow meter (monitoring hydrogen follow-up volume flow), a 22-regulating valve (dynamically regulating hydrogen follow-up flow along with monitoring signals), and a 23-stage outlet valve (manual on-off switching) which enter a gas gathering pipeline, the gas gathering pipeline is provided with 24 pressure transmitters (pressure on-line detection, signal remote transmission linkage), 25 hydrogen thermometers (displaying hydrogen temperature), 26 temperature transmitters (temperature on-line detection, signal remote transmission linkage), 29 safety relief valves, 28 valves and 27 bypass valve groups (safety evacuation and automatic relief), two-stage safety valves are gathered outside the pry, evacuation is relieved after 61 flame arresters, and the outlet is provided with 30 check valves (preventing natural gas from flowing back) and the like. The pipeline is made of 316L, and the components are made of special hydrogen materials.
(2) Natural gas pipeline
Natural gas enters a natural gas pipeline in the gas mixing device through a gas supply pipeline. 31 natural gas heat value analyzer (detecting the heat value of the incoming gas and natural gas), 32 pressure transmitter (pressure on-line detection, signal remote transmission linkage), 33 temperature transmitter (temperature on-line detection, signal remote transmission linkage), 34 natural gas pressure gauge (pressure on-site display), 35 natural gas thermometer (temperature on-site display), then the natural gas enters the pressure regulating metering pipeline and is divided into two paths (one path is opened and one path is prepared), each path of inlet is provided with 36 manual ball valves (manual on-off switching), 37 high-precision filters (filtering water, fine coal dust, dust and other impurities), 38 pneumatic emergency cut-off valves (the valves are of a fault closing type, and are controlled by a PLC control cabinet of a device system in an interlocking manner), 39 pressure regulators (stable active gas source pressure), 40 natural gas pressure gauges (displaying the regulated pressure), 41 natural gas flow meters (metering the instantaneous volume flow of the natural gas), 42 governing valve (automatically regulated natural gas flow), 43 export manual ball valves (manual switching of opening and close) get into and converge the gas pipeline, are equipped with 44 pressure transmitter (pressure on-line measuring, signal teletransmission chain), 47 safety relief valve, 46 natural gas root valve and 45 natural gas bypass valves (safe evacuation and automatic relief) on converging the gas pipeline and gather outside the sled, evacuation is let off behind 48 natural gas spark arrester. In order to reduce the equipment cost, the pipeline component is made of carbon steel, and the pipeline is a conventional carbon steel pipeline.
(3) Mixed gas pipeline
Natural gas and hydrogen enter a 49 static mixer together to be mixed, a 52-flow guide pipe is arranged at a hydrogen inlet to mix the diffused hydrogen and the natural gas for the first time, the two gases are fully mixed by 53 groups of metal plate corrugated filler vortex generators in the static mixer (the mixing uniformity of the two gases can reach more than 98 percent after being fully mixed), a 50 instrument valve and a 51 differential pressure gauge (the blockage condition of the filler is observed in real time) are arranged on a static mixer body, a 62 blow-off valve is arranged at a lower low point, a 54 methane and 55 hydrogen component online analyzer (analyzing the contents of methane and hydrogen in the mixed gas and transmitting a signal to a control system in real time and automatically controlling a feedback interlocking regulating valve) is arranged on a rear pipeline, a 56 pressure transmitter (pressure online detection, signal remote transmission interlocking), a 57 temperature transmitter (temperature online detection, signal remote transmission interlocking) is arranged at the rear part, A58 mixed gas pipeline pressure gauge (displaying mixed gas pressure), a 59 mixed gas thermometer (displaying mixed gas temperature) and a 60-outlet manual ball valve (manual start-stop system) are arranged in the box body, and 63 combustible gas leakage alarm probes (monitoring gas leakage in real time and remotely transmitting signals) and 64 linked explosion-proof fans are arranged in the box body.
In the present invention, fig. 8 is a schematic view of the assembly of the natural gas pipeline section provided by the embodiment of the present invention.
Fig. 9 is a schematic view of the assembly of the hybrid tracheal line portion according to the embodiment of the present invention.
In fig. 7, 8, 9: n1 NG inlet; an outlet of the mixed gas of N2; n3 purge outlet 1; n4 purge outlet 2; an N5 hydrogen inlet; an N6 reserved port; n7 gauge tuyere; n8 drain outlet (Natural gas)
Wherein, the material of the external interface flange of the mixed gas outlet is 20#, which is convenient for the connection of the opposite pipeline.
The invention is further described below in conjunction with specific device hardware and parameters.
Examples
Technical parameters of gas mixing equipment
1. Device name overview
Gas and hydrogen mixing equipment
2. Environmental climate conditions
Annual extreme minimum temperature: -25 ℃;
extreme maximum air temperature: 36.8 ℃;
annual average precipitation: 750 mm.
3. Gas component
3.1 coal bed gas quality
Because the concentration of methane in the coal bed gas is unstable, the concentration of methane is between 90% and 99%, the rest parts are mainly nitrogen, oxygen, carbon dioxide and the like, and the gas contains impurities such as moisture, fine coal dust, dust and the like, the equipment provided by a seller needs to meet the gas quality requirement.
3.2 quality of Hydrogen gas
The hydrogen concentration is 80-99%
3.3 proportion of Hydrogen
The hydrogen loading ratio is 3-20%.
3.4 flow
The hourly design flow rate of the blending equipment is 600 square/hour, wherein the hydrogen flow rate is as follows: 3-30 square/hour at the early stage and 20-120 square/hour at the later stage; the early flow of the fuel gas is 20-120 Nm3/h, and the later flow is 100-600 Nm3H is used as the reference value. The device reserves 25% of expansion space, and after the flowmeter is replaced, the mixing device can increase the flow rate in the design hour by 25%.
3.5 pressure
Blending equipment natural gas (coal bed gas) inlet pressure: 0.3-0.4 MPa.
Inlet pressure of hydrogen of blending equipment: 20MPa (long tube trailer), and the on-site hydrogen production is considered in the later stage, and the inlet pressure is 0.5-0.8 MPa.
The outlet pressure of the mixing equipment is 0.25-0.3MPa, and the natural gas and the hydrogen are uniformly mixed.
3.6 control System
The system is provided with one PLC control cabinet and one industrial personal computer, and realizes the automatic control and safety cut-off protection functions of the field gas mixing device. The control cabinet is provided with a touch screen and can also be operated on an industrial personal computer to display the inlet and outlet pressure, the outlet hydrogen content and the valve state of the equipment and the opening size of the regulating valve; setting parameters; querying a historical alarm; and querying a data report.
The device needs to modify corresponding parameters on a touch screen or an industrial personal computer according to the requirement of the concentration of hydrogen at the outlet of a user, so that the outlet parameters of the gas mixing device meet the requirement; the whole gas mixing process PLC carries out automatic control according to the acquired flow value and the gas concentration. And (3) monitoring the outlet pressure and the outlet gas concentration in real time in the gas mixing process, and setting a required linkage protection function (cutting off a hydrogen loop and ensuring that the outlet gas of the equipment meets the requirement) according to the characteristics of downstream hydrogen when the outlet gas concentration reports low and high and the outlet gas pressure reports low and high. The gas mixing device realizes the control of the whole gas mixing system through the PLC control cabinet and the industrial personal computer, and the cabinet body of the control cabinet can be non-explosion-proof and is arranged in the control room.
(II) system process flow description:
(1) natural gas section
Natural gas enters a natural gas pipeline in the gas mixing device through a gas supply pipeline. The line is provided with an inlet and outlet ball valve, a filter, a pneumatic cut-off valve (the valve is of a fault closing type and is controlled by a PLC control cabinet of the device system), a pressure regulator, a flowmeter, a regulating valve, a transmitter, a safety relief valve, a detection instrument and the like. The pipeline is two-way one-use one-standby.
The natural gas from the source enters the gas mixing pipeline, passes through the inlet ball valve and the filter cut-off valve, and enters the gas mixing device from the regulating valve to the outlet ball valve after pressure regulating and metering.
The safety valve plays a role in discharging, and when the pressure in the pipeline exceeds the setting pressure of the safety valve, the safety valve jumps to discharge gas in the pipeline to the bleeding pipeline to ensure the safety of equipment and personnel.
(2) Hydrogen segment
The tank car is loaded with hydrogen and enters a hydrogen pipeline in the gas mixing device through a hydrogen unloading column pipeline. An inlet ball valve, a pneumatic cut-off valve (the valve is of a fault closing type and is controlled by a PLC control cabinet of the device system), a filter, a pressure regulator, a flowmeter, a transmitter, a regulating valve, an outlet ball valve, a safety relief valve and the like are arranged in the circuit. The pipeline is two-way one-use one-standby. And reserving a second-stage hydrogen pipeline interface after the pressure regulating part.
The source hydrogen enters the gas mixing pipeline, flows through the inlet ball valve, the stop valve and the filter, measures the hydrogen flow through the flow meter, and enters the gas mixing device through the outlet ball valve after the hydrogen consumption is adjusted through the adjusting valve.
The safety valve plays a role in discharging, and when the pressure in the pipeline exceeds the setting pressure of the safety valve, the safety valve jumps to discharge gas in the pipeline to the bleeding pipeline to ensure the safety of equipment and personnel.
The hydrogen outlet is provided with a check valve to prevent backflow.
(3) Internal control (gas mixing principle)
The cut-off valves on the hydrogen and natural gas pipelines are interlocked with the pressure transmitters at the inlets of the two pipelines, and the cut-off valves close and cut off the gas source to stop working when the pressure exceeds the set pressure.
And the natural gas pipeline outlet pressure transmitter controls the natural gas outlet regulating valve to open and close to regulate the natural gas pressure to reach the required range before gas mixing.
The hydrogen section flowmeter controls the opening and closing degree of the hydrogen outlet regulating valve, and controls the hydrogen flow according to the matching requirement to reach the preliminary gas mixing matching requirement.
The mixed gas outlet methane analyzer and the hydrogen analyzer jointly control the opening of the regulating valve on the hydrogen pipeline to control the hydrogen flow, so that the accurate ratio of the natural gas to the hydrogen is achieved.
The utility model relates to a hardware instrument as follows:
(a) a detection instrument: the natural gas circuit import sets up methane concentration analyzer, and the device export sets up methane concentration analyzer and hydrogen concentration analyzer after mixing, and seller's methane concentration analyzer selects for use the brand for Japan research, and hydrogen concentration analyzer selects for use the brand for Hunan makes an ampere, and the instrument detects data fast, the reaction is sensitive, the detected concentration transmits the station control system for through PLC switch board data interface.
(b) A flow meter: the gas part of the device adopts a Roots flowmeter, the hydrogen part adopts a high-precision flowmeter suitable for measuring hydrogen, and a precession vortex flowmeter is selected; and the data acquired by the flowmeter is transmitted to a station control system through a PLC control cabinet data interface.
(c) Partial hydrogen material: all valves, filters, pressure regulators, flow meters, regulating valves, cut-off valves, check valves and the like for hydrogen are all made of materials suitable for hydrogen quality, and are processed, sealed and the like.
(d) Selecting materials for hydrogen partial pipe fittings: because hydrogen has special properties and affects hydrogen corrosion, hydrogen swelling, hydrogen embrittlement and the like of the pipeline, the pipeline is made of 316L or 316SS materials, deoiled and degreased and polished by alkaline liquid.
(e) Skid-mounted part
(1) The gas mixing device consists of 1 skid-mounted device.
(2) The sledge seat is equipped with the vertical adjustment positioning bolt for field installation. And (4) electroplating the railing, the pedal, the bolt and the nut. (3) The center distances of all foundation bolt holes are kept within 1.6mm tolerance and are not accumulated. The other link positions were held to a 6.4mm tolerance.
(4) The skid mounts are sufficiently rigid in all directions to ensure that the centering is maintained without shifting during long term operation. All loaded components were welded using full penetration.
(5) The upper panel of the sledge seat is provided with a liquid collecting edge and a sewage draining interface. The skid upper panel does not serve as a mounting surface for rotating equipment or piping/equipment.
(6) All structural components (except the bail and shackle) have a safety factor of at least 2.0.
(7) The size of the sledge body is reasonably set by a supplier according to transportation conditions and on-site overhaul convenience.
(8) The selection of the materials enables the performance of the gas mixing device to meet the requirements of the working conditions, and the service life can be ensured.
(9) The main parts and standard parts provide material chemical composition and mechanical performance detection reports and nondestructive detection reports.
(f) Instrument and meter
(1) All instruments are explosion-proof, and the explosion-proof grade is as follows: ExdIIBT4, protection rating: IP 65.
(2) Transmitter 4-20mA DC signal output, 24V DC power supply.
(3) The electromagnetic valve is powered by 24VDC, and the explosion-proof grade is not lower than ExdIIBT 4.
(4) The intelligent locator is joined in marriage to the control valve, and pneumatic valve's annex is provided by the seller, and the pressure taking pipe adopts the stainless steel of phi 8, and pneumatic valve distribution source trigeminy piece.
(5) The on-site temperature indicating instrument adopts a universal bimetallic thermometer with a stainless steel outer protective sleeve, the dial diameter selects 100mm, and the connecting mode is as follows: the threaded connection M27 × 2.
(6) Integration temperature transmitter is selected for use in teletransmission temperature measurement, takes stainless steel protective case, connected mode: and (4) connecting by screw threads.
(7) The manometer chooses the stainless steel spring pipe for use, and manometer casing material chooses the stainless steel for use, and dial plate diameter chooses 100mm for use, and the process interface is M20 1.5.
(8) Cast aluminum materials are selected for the on-site junction box, and the explosion-proof grade is as follows: exeeibt 4, protection rating: IP 65.
(9) The wiring method comprises the following steps: the instrument is connected to the cable steel pipe threading of on-the-spot junction box.
(10) The pneumatic signal pipeline connected with the actuating mechanism, the pipe valve and the like are made of stainless steel materials and are connected in a clamping sleeve type mode.
The following is described further in connection with the device development process of the present invention.
(1) Natural gas + hydrogen mixes sled, it mixes two kinds of gases of natural gas, hydrogen and mixes the gas sled together. In-process at equipment work, the utility model discloses on the basis of fully absorbing foreign pressure regulating technique, combine internal actual conditions, research, developed the equipment that has independent intellectual property right. The pressure regulating device has the characteristics of complete functions, stable performance, high pressure regulating precision, compact structure and the like.
The utility model discloses the natural gas is 2 way one altogether and is used one and be equipped with, and the pipeline has ball valve, filter, roots's flowmeter, governing valve. Filtering the mixture by a filter, metering the flow, and adjusting the flow of the natural gas by an adjusting valve to meet the gas mixing proportion. Natural gas flow Qmax＝600Nm3/h。
The hydrogen gas is used in 2 paths and one standby, and the pipeline comprises a ball valve, a pneumatic cut-off valve, a filter, a flowmeter, a pressure regulator, a regulating valve and a one-way valve. The hydrogen pressure reaches the required pressure by filtering, metering and pressure regulating through a filter, and the flow of the hydrogen can be regulated by a regulating valve so as to meet the gas mixing proportion. The check valve prevents the mixture from entering the pipeline. Hydrogen flow rate Qmax＝120Nm3/h。
Designing technical parameters of equipment:
natural gas inlet pressure: 0.3-0.4 MPa.
Hydrogen inlet pressure range: 0.5-20 MPa.
Mixed gas outlet pressure range: 0.25-0.3 MPa.
A natural gas inlet flange: HG20592 DN 80-1.6 MPa RF.
Hydrogen gas inlet: DN25 weld end: phi 34 x 6.
A mixed gas outlet flange: HG20592 DN 80-1.6 MPa RF.
Installation description:
after the equipment arrives at the site, the equipment is arranged on a foundation and fixed by using foundation bolts, the equipment is well connected with the ground net, and an inlet flange and an outlet flange of the gas mixing device are connected with a user pipe network flange. After passing the airtight test, the product can be used.
The operation is as follows:
a. firstly, the position state of each valve in the pry is observed, the pressure gauge root valve is in a normally open state, and the other valves are kept in a closed state.
b. Firstly, adjusting a valve of a natural gas pipeline, observing the pressure at the inlet end, slowly opening the inlet valve after confirming the pressure of the incoming gas, then opening the valve after metering, (the mixed gas outlet valve is closed).
c. Then the valve of the hydrogen pipeline is opened in the same way, and the primary pressure regulator and the secondary pressure regulator are regulated to make the hydrogen pressure reach the use pressure. During the pressure regulation and use process, attention needs to be paid to the inlet and outlet pressure values of the air pipeline at any time.
d. The utility model discloses can lead to natural gas earlier and supply the user to use to low reaches official website, then open hydrogen gas circuit outlet valve and mix, make export hydrogen content reach the requirement through adjusting each parameter.
e. When the gas mixing pry is stopped, the inlet end valve of each pipeline is closed firstly, after the residual gas in the pry is used, the outlet valve of the gas mixing pry is closed, and if the gas mixing pry is stopped in a normal period, the residual gas in the gas mixing pry is discharged through the blow-down valve.
Control system
The utility model discloses be equipped with the PLC switch board, there is a touch-sensitive screen in the switch board quotation, and the control room is one set of industrial computer in addition. The touch screen and the industrial personal computer can simultaneously display the numerical values of various remote transmission instruments in the gas mixing pry, the states of the valves, relevant operations and the like.
Each main component comprises:
voltage regulator
a. Natural gas: the technical parameters are as follows: 299H DN 50; inlet pressure: 0.3-0.4MPa outlet pressure: 0.3 MPa.
Hydrogen minor path: the technical parameters are as follows: 44-2200;
DN25 inlet pressure: 20 MPa;
outlet pressure: 0.5 MPa.
Hydrogen main path: the technical parameters are as follows: 44-3200DN 25;
inlet pressure: 0.5 MPa;
outlet pressure: 0.3 MPa.
b. Adjusting pressure:
a voltage regulator: before adjusting the pressure, please read the pressure regulator "instruction manual" in detail. The operation is carried out according to the instruction.
c. Maintenance of the voltage regulator:
checking whether the working pressure of the pressure regulator is normal every day, wherein the output pressure of the pressure regulator changes to be normal within +/-5%; when the output pressure of the pressure regulator exceeds the normal gas supply pressure due to the change of the gas flow, the outlet pressure of the pressure regulator is adjusted in time.
And (3) Roots flow meter:
the technical parameters are as follows: DN80 PN16 traffic: 1000Nm3/H working pressure: 0.05MPa quantity: 2.
the technical parameters are as follows: DN100 PN16 traffic: 3000Nm3/H working pressure: 0.65-0.8MPa quantity: 2.
precession vortex flowmeter:
the technical parameters of the path are as follows: DN15 PN16 traffic: 0.5-9m3H working pressure: 0.3MPa quantity: 1
Technical parameters of the major road: DN25 PN16 traffic: 3-30m3H working pressure: 0.3MPa quantity: 1.
a valve:
a. when the valve is opened, the rotating shaft is too tight, and engine oil can be dripped for lubrication.
b. When the valve opens the pivot position and takes place the gas leakage, can use spanner to screw up the screw on the flange lid, twist the screw and should balance the afterburning, can not one side weight partially, the opposite side light partially.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure should be limited only by the attached claims.
Claims (9)
1. A hydrogen energy utilization gas blending system, comprising:
the PLC control cabinet is provided with a touch screen and is used for displaying the inlet and outlet pressure, the outlet hydrogen content and the valve state of equipment, displaying the opening size of the regulating valve, setting parameters, inquiring historical alarm and inquiring a data report;
and the industrial personal computer is communicated with the PLC control cabinet and is used for automatically controlling the field gas mixing device and safely cutting off protection.
2. The hydrogen energy source utilizing fuel gas blending system of claim 1, further comprising:
the hydrogen pipeline device is characterized in that source hydrogen enters a gas mixing pipeline, passes through an inlet ball valve, a pneumatic stop valve and a filter, measures the hydrogen flow through a flowmeter, regulates the hydrogen consumption through an adjusting valve and then enters the gas mixing device through an outlet ball valve;
in the natural gas pipeline device, source natural gas enters a gas mixing pipeline, passes through an inlet ball valve and a filter cut-off valve, is subjected to pressure regulation and metering, then passes through an adjusting valve to an outlet ball valve, and enters the gas mixing device;
the flow value after the detection equipment of the gas mixing outlet is mixed and temperature and pressure compensated controls the opening of the regulating valves on the natural gas and hydrogen pipelines together, the hydrogen volume flow is controlled, the on-line regulation and automatic following of the hydrogenation amount are carried out, and the natural gas and hydrogen proportioning is realized.
3. The hydrogen energy utilizing gas blending system of claim 2, wherein the hydrogen pipeline means comprises: and the hydrogen high-pressure hose is connected with a hydrogen pressure regulating pipeline through a vent valve, a manual high-pressure ball valve and a pressure transmitter.
4. The system for blending hydrogen energy with gas as recited in claim 3, wherein the hydrogen pressure regulating pipeline is connected to the gas collecting pipeline through an inlet ball valve, a pneumatic emergency cut-off valve, a high-precision high-pressure filter, a primary pressure regulator, a hydrogen pressure gauge, and a primary outlet valve, the gas collecting pipeline is provided with a pressure transmitter, a bypass manual ball valve, a safety relief valve, a hydrogen root valve, and a hydrogen bypass valve set, hydrogen is connected to the secondary pressure regulating pipeline through a collecting pipe, the secondary pressure regulating pipeline is provided with two paths, each path is provided with an inlet ball valve, a secondary pressure regulator, a hydrogen pressure gauge, a hydrogen flow meter, a regulating valve, and a secondary outlet valve, the two-path enters the gas collecting pipeline, the gas collecting pipeline is provided with a pressure transmitter, a hydrogen thermometer, a temperature transmitter, a safety relief valve, a root valve, and a bypass valve set, and the two-.
5. The hydrogen energy utilizing gas blending system of claim 2, wherein the natural gas line means comprises:
the inlet pipeline is internally provided with a natural gas heat value analyzer, a pressure transmitter, a temperature transmitter, a natural gas pressure gauge and a natural gas thermometer, then natural gas enters the pressure regulating metering pipeline and is divided into two paths, each path of inlet is provided with a manual ball valve, a high-precision filter, a pneumatic emergency cut-off valve, a pressure regulator, a natural gas pressure gauge, a natural gas flowmeter, a regulating valve and an outlet manual ball valve, the natural gas flowmeter and the outlet manual ball valve enter the gas gathering pipeline, and the gas gathering pipeline is provided with the pressure transmitter, a safety relief valve, a natural gas root valve and a natural gas.
6. The system for blending hydrogen energy utilization fuel gas as recited in claim 2, wherein the gas mixing device is provided with a static mixer for communicating natural gas and hydrogen gas, the hydrogen gas inlet is provided with a flow guide pipe, and a plurality of groups of metal plate corrugated packing vortex generators are arranged in the static mixer.
7. The system for blending hydrogen energy with gas as described in claim 6, wherein the static mixer is provided with an instrument valve and a differential pressure gauge, a blow-down valve is arranged at a low point below the static mixer, a pipeline behind the static mixer is provided with an online analyzer for methane and hydrogen components, a pressure transmitter, a temperature transmitter, a mixed gas pipeline pressure gauge, a mixed gas thermometer and an outlet manual ball valve are arranged behind the static mixer, and a combustible gas leakage alarm probe and an interlocking explosion-proof fan for monitoring gas leakage in real time are arranged in the box.
8. The hydrogen energy utilization gas blending system according to claim 1, wherein an outlet of the gas mixing device is provided with a methane analyzer and a hydrogen analyzer.
9. The hydrogen energy utilization gas blending system of claim 1, wherein the PLC control cabinet performs automatic control according to the collected flow value and gas concentration; and monitoring the outlet pressure and the outlet gas concentration in real time in the gas mixing process, and setting the required linkage protection according to the downstream hydrogen requirement when the outlet gas concentration reports low and high and the outlet pressure reports low and high.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992071A (en) * | 2020-08-13 | 2020-11-27 | 山西铭石煤层气利用股份有限公司 | Hydrogen energy utilization fuel gas mixing system and hydrogen and natural gas ratio control method |
| CN113341060A (en) * | 2021-06-11 | 2021-09-03 | 中国石油大学(华东) | Medium-low pressure hydrogen-containing pipeline experiment system and method |
| CN113390019A (en) * | 2021-07-02 | 2021-09-14 | 中冶西北工程技术有限公司 | Natural gas hydrogen mixing system |
| CN114950172A (en) * | 2022-05-26 | 2022-08-30 | 北京市燃气集团有限责任公司 | Control system, method and device for dynamically adjusting hydrogen-doped mixed gas uniformity |
| US20230088217A1 (en) * | 2021-09-22 | 2023-03-23 | Michael D. Mercer | Intelligent fuel storage system |
| WO2023047384A1 (en) * | 2021-09-27 | 2023-03-30 | Regaenergy Group, S.A. | Decentralized gas network management system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992071A (en) * | 2020-08-13 | 2020-11-27 | 山西铭石煤层气利用股份有限公司 | Hydrogen energy utilization fuel gas mixing system and hydrogen and natural gas ratio control method |
| CN113341060A (en) * | 2021-06-11 | 2021-09-03 | 中国石油大学(华东) | Medium-low pressure hydrogen-containing pipeline experiment system and method |
| CN113390019A (en) * | 2021-07-02 | 2021-09-14 | 中冶西北工程技术有限公司 | Natural gas hydrogen mixing system |
| US20230088217A1 (en) * | 2021-09-22 | 2023-03-23 | Michael D. Mercer | Intelligent fuel storage system |
| US20230086470A1 (en) * | 2021-09-22 | 2023-03-23 | Michael D. Mercer | Energy utilization system |
| US11885270B2 (en) * | 2021-09-22 | 2024-01-30 | Michael D. Mercer | Energy utilization system |
| US11927144B2 (en) * | 2021-09-22 | 2024-03-12 | Michael D. Mercer | Intelligent fuel storage system |
| WO2023047384A1 (en) * | 2021-09-27 | 2023-03-30 | Regaenergy Group, S.A. | Decentralized gas network management system |
| CN114950172A (en) * | 2022-05-26 | 2022-08-30 | 北京市燃气集团有限责任公司 | Control system, method and device for dynamically adjusting hydrogen-doped mixed gas uniformity |
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