CN111928119A - Mine gas safety mixing system and gas mixing ratio control method - Google Patents
Mine gas safety mixing system and gas mixing ratio control method Download PDFInfo
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- CN111928119A CN111928119A CN202010783747.4A CN202010783747A CN111928119A CN 111928119 A CN111928119 A CN 111928119A CN 202010783747 A CN202010783747 A CN 202010783747A CN 111928119 A CN111928119 A CN 111928119A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
Abstract
The invention belongs to the technical field of energy utilization, and discloses a mine gas safe mixing system and a gas mixing proportion control method, which are provided with the following steps: the device is used for displaying the temperature and pressure of an inlet and an outlet of the device, the methane content of the inlet and the outlet and the state of a valve, the opening size of a regulating valve, the flow numerical value and the numerical value of a gas leakage alarm and performing interlocking control; mix the gas device and carry out the high low concentration gas and get into static mixer jointly and mix, set up the honeycomb duct at low concentration gas entry, the low concentration gas that will diffuse out and main road high concentration gas mix for the first time, two kinds of gas after mixing for the first time carry out the whirl through vortex device, accomplish the second time and mix, and the multiunit metal sheet ripple filler turbulence generator through static mixer is with two kinds of gaseously intensive intermix, accomplishes the third time and mixes. The gas mixing device has the advantages of realizing high-precision gas mixing, stable real-time flow following, stable pressure of explosion limit gas, reliable pressure relief, safe gas supply and reliable alarm and cut-off of gas leakage.
Description
Technical Field
The invention belongs to the technical field of energy utilization, and particularly relates to a mine gas safety blending system and a gas blending ratio control method.
Background
At present, the existing ground gas drainage system is divided into two sets of extraction systems of high-concentration gas and low-concentration gas. According to the prior operation experience and data statistics of the mining area, the output of the high-concentration gas is as follows: 500-13000Nm3The methane concentration is 40-50%. The output of the low-concentration gas is as follows: 200-8000Nm3The methane concentration is 15-20%, and the designed value of the mixed methane content is 30%. The methane content of the gas required by the power plant must be ensured to be more than 30 percent, so the high-concentration gas is pumped out by a gas pumping and discharging pump and enters a pipe network after passing through a wet-type overpressure discharging device for the direct utilization of the gas power plant. The low-concentration gas is connected to the explosion limit due to low methane content, so that a gas power plant cannot be directly utilized, and the low-concentration gas is directly discharged after being pumped by a gas drainage pump.
The difficulty in solving the above problems is:
(1) the prior gas mixing technology has the advantages of simplicity, low gas mixing precision, incapability of being completely suitable for the design working condition, and need to be improved and perfected.
(2) At present, domestic mine gas low-methane-concentration gas is directly discharged and treated to the air, resources are wasted, environment pollution is caused, and applicable gas mixing equipment is urgently needed.
(3) As the explosion range of natural gas in the atmosphere is 5-15 percent, and the methane concentration in low-concentration gas is 15-20 percent, which is very close to the explosion range, the equipment must ensure the uniformity of mixed gas and ensure the stable and safe combustion.
(4) The low methane concentration gas is explosive gas, and the pressure and flow stability must be ensured before entering the gas mixing system, and a safe and reliable pressure stabilizing device and a safe and applicable diffusion system need to be considered.
(5) The fluctuation of the gas flow of the main gas source high-methane concentration gas is very large, and in order to ensure the accuracy of a gas mixing outlet, a driven gas source must be ensured to accurately follow the flow change of a driving gas source to adjust and change in time.
(6) All the gas paths of the system are inflammable and explosive gas, and the control system needs to consider the safety protection measures of gas leakage.
Through the analysis, no mature and reliable technical scheme is available at present, the process of other similar systems can only be used for reference, a follow-up flow gas mixing system commonly used in liquefied petroleum gas mixing is selected, and the problems and the defects existing in the prior art are as follows:
(1) the concentration of a gas mixing medium of the existing gas mixing equipment is far away from the explosion limit; the general static mixer has the advantages of simple structure, poor gas mixing precision, uneven gas mixing, unreliable performance, unstable process operation and low safety control level.
(2) In the prior art, the working condition of large fluctuation of gas consumption is generally not considered, the equipment model is designed according to the maximum flow, and the gas mixing precision is very low even cannot be automatically followed when the gas consumption is small and is lower than the rated flow value by less than 10 percent.
(3) The gas with low methane concentration is connected into the explosion limit, the pressure and flow are out of limit and dangerous to the system, and a safe and timely pressure relief mode is adopted.
(4) The low methane concentration gas is connected into the explosion limit, the gas leakage is dangerous, and a leakage-proof device and a process are needed.
The significance of solving the problems and the defects is as follows: the gas power plant can not run at full load due to insufficient gas output of high-concentration gas. The low-concentration gas contains certain methane, but cannot meet the direct utilization condition of a gas power plant. The waste of a large amount of resources and environmental pollution are caused by directly carrying out evacuation treatment after being pumped by a pumping pump. Because the concentration of the high-concentration methane gas is higher than the requirement of the methane content required by the gas power plant, and the concentration of the low-concentration methane gas is lower than the requirement of the methane content required by the gas power plant. Comprehensively considering, in order to reduce resource waste, after high-concentration gas and low-concentration gas are mixed, the concentration of methane at the outlet of the mixed gas is ensured to be more than or equal to 25%, and then the mixed gas enters a pipe network for being used by a gas power plant. Therefore, the low-concentration gas can be fully utilized, the waste is reduced, the environmental pollution is reduced, and the benefit maximization of a gas power plant can be ensured.
Disclosure of Invention
In order to overcome the problems in the related art, the invention provides a mine gas safety blending system and a gas blending proportion control method.
This mine gas safety mixing system is provided with: the device is used for displaying the temperature and pressure of an inlet and an outlet of the device, the methane content of the inlet and the outlet and the state of a valve, the opening size of a regulating valve, the flow numerical value and the numerical value of a gas leakage alarm and performing interlocking control; the PLC control cabinet is used for parameter setting, historical alarm query and data report query;
the industrial personal computer is connected with the PLC control cabinet and is used for automatically controlling the field gas mixing device and safely cutting off and protecting the field gas mixing device;
the low-methane concentration gas pipeline device is characterized in that source low-concentration gas enters a gas mixing pipeline and is divided into two paths of large and small flows to be connected in parallel for use after passing through an inlet butterfly valve, a wet type bleeding valve group and a detection instrument, each path is provided with a manual butterfly valve and a pneumatic stop valve, the flow is measured through a flow meter, the low-concentration gas is adjusted through an adjusting valve and then enters the gas mixing device through an outlet butterfly valve, and therefore when the flow of the high-concentration gas is small (lower than a rated flow value by 10 percent), the low-concentration gas can be stably followed;
in the high-methane concentration gas pipeline device, high-concentration gas from a source enters a gas mixing pipeline, passes through an inlet butterfly valve, a detection instrument and a pneumatic stop valve, is metered by a flowmeter, passes through an adjusting valve to an outlet butterfly valve and enters a gas mixing device;
the gas mixing device is provided with a high-efficiency static mixer of the triple gas mixing device, a detection instrument of a gas mixing outlet is matched with a flow value after temperature and pressure compensation to jointly control the opening degree of an adjusting valve on an inlet pipeline of two gases, the volume flow of the low-concentration gas is controlled, the online adjustment and the automatic following of the gas mixing concentration are carried out, and the accurate proportioning of the high-concentration gas and the low-concentration gas is realized.
In one embodiment, the low-methane-concentration gas safety relief pipeline is provided with three parallel-connected pipelines, one pipeline is a manual butterfly valve pipeline, when the pressure of a pipe network is ultrahigh, the pipeline can be opened manually for pressure relief, the other pipeline is an automatic regulating valve pipeline, the pressure signal of the pipe network is overrun, a control system interlocks an automatic regulating valve, a valve port is opened automatically for pressure relief, the higher the pressure is, the larger the opening degree of the valve port is, if the pressure of the pipe network is ultrahigh, the wet relief valve is opened automatically for pressure relief, three-level linkage control is realized according to pressure fluctuation of the pipe network, the stability of the system is ensured, and the released gas.
In one embodiment, the low methane concentration gas pipeline device and the high methane concentration gas pipeline device are both provided with a combustible gas leakage alarm probe, and the combustible gas leakage alarm probe is connected with a system acousto-optic alarm device and each path of gas emergency stop valve.
In one embodiment, the gas mixing device performs mixing by jointly feeding high-concentration gas and low-concentration gas into the static mixer, a flow guide pipe is arranged at a low-concentration gas inlet, the diffused low-concentration gas and the main high-concentration gas are primarily mixed, the two primarily mixed gases are swirled by the vortex device to complete secondary mixing, the two gases are fully mixed by the plurality of groups of metal plate corrugated filler turbulence generators in the static mixer to complete tertiary mixing, after triple mixing, the gas mixing precision of the mixed gas reaches more than 98%, an instrument valve and a differential pressure gauge are arranged on the static mixer body, and a drain valve is arranged at a lower low point.
In one embodiment, a pipeline behind the gas mixing device is provided with a double-path methane component content online analyzer which is connected with a pressure transmitter, a temperature transmitter, a mixed gas pipeline pressure gauge, a mixed gas thermometer, a mixed gas total flow meter and an outlet manual butterfly valve.
In one embodiment, the pneumatic cut-off valves of the low-methane concentration gas pipeline device and the high-methane concentration gas pipeline device are interlocked with respective gas inlet and outlet pressure, a temperature transmitter and a methane content analyzer automatic detection alarm, and when the numerical value exceeds the set value plus or minus 10%, the pneumatic cut-off valves automatically close and cut off the high-low concentration gas source;
and the low-methane-concentration gas pipeline device and the high-methane-concentration gas pipeline device outlet pressure transmitter monitor the gas-conditioned pressure of the high-methane-concentration gas and the low-methane-concentration gas in real time, and when the numerical value exceeds the range of plus or minus 10 percent of a set value, the control system gives an alarm.
In one embodiment, the low-concentration gas flowmeter in the low-methane-concentration gas pipeline device controls the opening and closing degree of the low-concentration gas outlet regulating valve, compares the high-concentration gas flow value, and controls the flow of the low-concentration gas according to the proportioning requirement to realize the required value of the gas-mixing proportioning.
In one embodiment, the proportioning requirement is that the high-concentration gas output is: 500-13000Nm3The methane concentration is 40-50%;
the output of the low-concentration gas is as follows: 200-8000Nm3The methane concentration is 15-20%; the methane content after mixing must be guaranteed to be more than 25%.
The invention also aims to provide a gas mixing ratio control method for realizing the mine gas safety mixing system, which comprises the following steps:
the pneumatic cut-off valves on the low-methane concentration gas pipeline device and the high-methane concentration gas pipeline device are interlocked with respective gas inlet and outlet pressure, a temperature transmitter and an automatic detection alarm of a methane content analyzer, and when the numerical value exceeds the positive and negative 10% of a set value, the pneumatic cut-off valves automatically close and cut off the high-low concentration gas source;
the high-low concentration gas pipeline outlet pressure transmitter monitors the gas-conditioned pressure of high-methane concentration and low-methane concentration gas in real time, and when the numerical value exceeds the range of plus or minus 10 percent of a set value, the control system gives an alarm;
the low-concentration gas flowmeter controls the opening and closing degree of the low-concentration gas outlet regulating valve, compares the high-concentration gas flow value, and controls the flow of the low-concentration gas according to the matching requirement to realize the required value of gas mixing matching;
the detection equipment of the mixed gas outlet is matched with the flow value after temperature and pressure compensation to jointly control the opening of the on-line regulating valve of the high-concentration gas pipe and the low-concentration gas pipe, so that the accumulated flow of the low-concentration gas is controlled according to the change of the gas consumption, the on-line regulation and automatic following of the low-concentration gas are carried out, and the final proportioning is realized.
In one embodiment, the gas mixing device at the gas mixing outlet adopts a component content analyzer to change to complete automatic following dynamic adjustment, adopts two gas flow signals to carry out primary coarse adjustment, and quickly finds an initial gas mixing balance point according to the flow ratio, so that the final fine adjustment according to the methane content is quickly and stably realized;
high low concentration gas gets into static mixer jointly and mixes, static mixer carries out tertiary mixing design, set up the honeycomb duct at low concentration gas entry, the low concentration gas that will diffuse out and main way high concentration gas carry out the primary mixing, two kinds of gaseous processes whirl through vortex device after mixing just, accomplish the secondary and mix, the multiunit metal sheet ripple packing turbulence generator through the static mixer rear end again is with two kinds of gaseous abundant intermixtures, accomplish the tertiary and mix, triple after mixing, the gas mixing precision reaches more than 98%, set up instrument valve and differential pressure table on the static mixer body, the below low point sets up the blowoff valve.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
firstly, the mine gas safety mixing system realizes high-precision gas mixing, stable real-time flow following, stable pressure of explosion limit gas, reliable pressure relief, safe gas supply, reliable alarm and cut-off of gas leakage, nearly one year after the equipment is put into production formally, stable work and reliable performance.
And secondly, the gas with low methane concentration in the mine can be utilized and combusted, so that the energy loss caused by direct evacuation and diffusion of the gas in the past is avoided, the energy utilization rate is improved, and the environmental pollution is reduced.
Thirdly, the invention realizes stable gas mixing ratio of the two gases and high mixing precision, is particularly suitable for the working condition of large fluctuation range of the flow of the active gas source, is skid-mounted on the whole equipment, has compact equipment and small occupied area, and is convenient to install and move.
Fourth, combine experimental or experimental data and the effect and the advantage that prior art contrast obtained:
drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
Fig. 1 is a schematic diagram of a mine gas safety blending system provided by an embodiment of the invention.
Fig. 2 is a sectional view of a mine gas safety blending system provided by an embodiment of the invention.
Fig. 3 is a view of a mine gas safety blending system provided by an embodiment of the invention.
Fig. 4 is a perspective view of a mine gas safety blending system provided by an embodiment of the invention.
In the figure: 1. a gas inlet butterfly valve DN 700; 2. a front butterfly valve DN500 of the wet bleeding valve group regulating valve; 3. a wet bleed valve group regulating valve DN 300; 4. a front butterfly valve DN500 of the wet bleeding valve group regulating valve; 5. a front butterfly valve DN500 of the wet type bleeding valve; 6. a wet bleed valve DN 500; 7. a manual butterfly valve DN500 of the wet bleeding valve group; 8. a methane component content analyzer and an instrument valve; 9. a thermometer; 10. a temperature transmitter; 11. a pressure gauge and a gauge valve; 12. a pressure transmitter and an instrument valve; 13. a large flow path manual butterfly valve DN 700; 14. a large-flow-path pneumatic emergency cut-off valve DN 700; 15. a large flow path V cone flowmeter DN 700; 16. a large flow path regulating valve DN 700; 17. a pressure gauge and a gauge valve; 18. a pressure transmitter and an instrument valve; 19. a large flow path manual butterfly valve DN 700; 20. a small flow path manual butterfly valve DN 400; 21. a small-flow-path pneumatic emergency cut-off valve DN 400; 22. a small flow path V cone flowmeter DN 400; 23. a small flow path regulating valve DN 400; 24. a small flow path manual butterfly valve DN 400; 25. a gas inlet butterfly valve DN 800; 26. a methane component content analyzer and an instrument valve; 27. a thermometer; 28. a temperature transmitter; 29. a pressure gauge and a gauge valve; 30. a pressure transmitter and an instrument valve; 31. a pneumatic emergency cut-off valve D800; 32. DN 800; 33. regulating valve DN 800; 34. a pressure gauge and a gauge valve; 35. a pressure transmitter and an instrument valve; 36. a manual butterfly valve DN 800; 37. a static mixer; 38. a flow guide pipe; 39 a vortex device; 40. a plurality of groups of metal plate corrugated packing turbulence generators; 41. an instrument valve; 42. a differential pressure gauge; 43. a first path of methane component content analyzer and an instrument valve; 44. a second path of methane component content analyzer and an instrument valve; 45. a thermometer; 46. a temperature transmitter; 47. a pressure gauge and a gauge valve; 48. a pressure transmitter and an instrument valve; 49. DN900 of the V-cone flowmeter; 50. a manual butterfly valve DN 900; 51. a combustible gas leakage alarm; 52. a combustible gas leakage alarm; 53. combustible gas leakage alarm.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to fig. 1 to 4. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," and the like are for purposes of illustration only and are not intended to represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The device of the embodiment adopts integrated skid-mounted material supply, and is provided with three skids and a set of control system integration according to the size of components, wherein the skids are respectively a skid I (HQT-1): prying and prying a high-concentration gas pipeline and a static mixer II (HQT-2): regulating pry and pry bodies III (HQT-3) of the low-concentration gas pipeline: the size of each pry body of the wet type bleeding valve set for the low-concentration gas pipeline is shown in the attached drawing.
The specific process comprises the following steps: the source low-concentration gas enters a gas mixing pipeline and is divided into two paths with large flow and small flow for parallel use through an inlet butterfly valve, a wet-type bleeding valve group and a detection instrument, each path is provided with a manual butterfly valve and a pneumatic cut-off valve, the flow is measured through a flowmeter, the low-concentration gas is adjusted through an adjusting valve, and then the low-concentration gas enters a static mixer through an outlet butterfly valve; high-concentration gas at the source enters a gas mixing pipeline, passes through an inlet butterfly valve, a detection instrument and a pneumatic cut-off valve, is metered by a flowmeter, passes through a regulating valve, reaches an outlet butterfly valve and enters a static mixer; the flow value after the detection instrument of the mixed gas outlet is matched with the temperature and pressure compensation controls the opening degree of the adjusting valve on the inlet pipeline of the two gases together, the volume flow of the low-concentration gas is controlled, the mixed gas concentration is adjusted on line and automatically followed, and the accurate proportioning of the high-concentration gas and the low-concentration gas is realized.
In order to ensure the stability and reliability of the gas mixing device, the configuration of automatically switching the use of the high and low flow rates is adopted before the low-concentration gas is conveyed to the gas mixing device, so that the precision and the gas supply stability of the gas mixing device are ensured; the high methane concentration gas is conveyed to a gas mixing device as the main partAnd the dynamic gas source is a low-methane-concentration gas source, and the flow and the methane content of the dynamic gas source are automatically dynamically adjusted along with the flow of the driving gas source through the regulating valve. The design flow rate of the high-concentration gas is 500-13000Nm3The design flow rate of the low-concentration gas is 200-8000Nm3/h。
The operation flow of the gas mixing device is as follows: the device comprises a manual butterfly valve, a pneumatic stop valve, a V-cone flowmeter, a pneumatic regulating valve, a static mixer, a mixed gas V-cone flowmeter and a manual butterfly valve. The high-concentration gas and the low-concentration gas are mixed in proportion by methane and then enter a pipe network after being fully mixed.
Parameters of the equipment
A. High and low dense gas inlet pressure: < 20KPa
B. Mixed gas outlet pressure: not less than 8KPa
C. The concentration of methane at the mixed gas outlet is 30 percent
D. Precision of mixed gas: plus or minus 2 percent of the set value
E. Maximum amount of high-concentration gas: 13000NM3/H
F. Maximum amount of low-concentration gas: 8000NM3/H
G. Maximum amount of mixed gas 21000NM3/H
(1) The pneumatic cut-off valves on the high-concentration gas pipeline and the low-concentration gas pipeline are interlocked with the respective gas inlet and outlet pressure, the temperature transmitter and the automatic detection alarm of the methane content analyzer, and when the numerical value exceeds the set value plus or minus 10%, the pneumatic cut-off valves automatically close and cut off the gas source of the high-concentration gas and the low-concentration gas;
the high-low concentration gas pipeline outlet pressure transmitter monitors the gas-conditioned pressure of high-methane concentration and low-methane concentration gas in real time, and when the numerical value exceeds the range of plus or minus 10 percent of a set value, the control system gives an alarm;
(2) the low-concentration gas flowmeter controls the opening and closing degree of the low-concentration gas outlet regulating valve, compares the high-concentration gas flow value, and outputs 500-13000Nm (Nm) of high-concentration gas according to the proportioning requirement3The methane concentration is 40-50%. The output of the low-concentration gas is as follows: 200-8000Nm3The methane concentration is 15-20%. The content of methane after mixing must be ensured to be more than 25 percent) to low concentrationControlling the gas flow to realize the required value of the gas mixing ratio;
the methane concentration detection equipment at the mixed gas inlet and outlet is matched with the flow value after temperature and pressure compensation to jointly control the opening degree of the on-line regulating valve of the high-concentration gas pipe and the low-concentration gas pipe, so that the volume flow of the low-concentration gas is controlled according to the change of the gas consumption, the on-line regulation and automatic following of the low-concentration gas are carried out, and the final accurate proportioning is realized. Conventional gas mixing equipment all adopts component content analyzer to change and accomplishes automatic dynamic adjustment of following, and numerical value fluctuation is very difficult to realize fast and stable regulation when equipment initial stage starts, and two kinds of gas flow signals of this system introduction carry out preliminary coarse adjustment, can find initial gas mixing balance point fast according to the flow ratio for finally carry out the accurate adjustment according to methane content and realize fast and steadily.
(3) Because the gas consumption of the system has larger fluctuation, the low-concentration gas pipeline is designed into a large flow path and a small flow path, and the flow meter and the regulating valve of the large flow path are 1000-8000Nm3The metering and regulating accuracy of/h is selected, the small flow path flowmeter and regulating valve are according to 200-1000Nm3The metering and regulating precision of/h is selected, and the automatic control system is 1000Nm according to the flow value of the follow-up gas3The pneumatic emergency cut-off valve for each inlet of the h automatic switch is used for switching the big and small paths, so that the accuracy and the stability of gas mixing are ensured to the maximum extent.
(4) The volume concentration of methane in air reaches 5-15%, namely the methane enters an explosion limit, the concentration of methane in low-concentration gas is 15% -20%, the methane is very close to an explosion point, the uniformity of mixed gas is ensured, the concentration of methane in the mixed gas is far away from the explosion limit, high-concentration gas and low-concentration gas enter a static mixer together for mixing, the static mixer is designed to be three-stage mixed, a draft tube is arranged at an inlet of the low-concentration gas, the diffused low-concentration gas and the main-path high-concentration gas are primarily mixed, the two primarily mixed gases are swirled by a vortex device to complete secondary mixing, the two gases are fully mixed by a plurality of groups of metal plate corrugated filler turbulence generators at the rear end of the static mixer to complete third mixing, the mixing precision of the mixed gases reaches more than 98% after triple mixing, an instrument valve and a differential pressure meter are arranged on a static mixer body, a blow-down valve is arranged at the lower low point.
(5) The low-concentration methane gas is very close to the explosion limit, so the flow and pressure stability of the low-concentration methane gas must be well controlled, the danger is avoided, a wet-type bleeding valve group is arranged at the pipeline inlet of the low-concentration methane gas, a manual valve circuit is arranged, an automatic regulating valve circuit and the wet-type bleeding valve circuit are connected in parallel for use, three-level joint control is realized according to pressure fluctuation of a pipe network, and the stability of the system is ensured.
The method for controlling the gas distribution ratio of the high-concentration mine gas and the low-concentration mine gas comprises the following steps:
the pneumatic cut-off valves on the high-concentration gas pipeline and the low-concentration gas pipeline are interlocked with the respective gas inlet and outlet pressure, the temperature transmitter and the automatic detection alarm of the methane content analyzer, and when the numerical value exceeds the set value plus or minus 10%, the pneumatic cut-off valves automatically close and cut off the gas source of the high-concentration gas and the low-concentration gas;
the high-low concentration gas pipeline outlet pressure transmitter monitors the gas-conditioned pressure of high-methane concentration and low-methane concentration gas in real time, and when the numerical value exceeds the range of plus or minus 10 percent of a set value, the control system gives an alarm;
the low-concentration gas flowmeter controls the opening and closing degree of the low-concentration gas outlet regulating valve, compares the high-concentration gas flow value, and outputs 500-13000Nm (Nm) of high-concentration gas according to the proportioning requirement3The methane concentration is 40-50%. The output of the low-concentration gas is as follows: 200-8000Nm3The methane concentration is 15-20%. The content of the mixed methane is ensured to be more than 25 percent) to control the flow of the low-concentration gas and realize the required value of the gas-mixing ratio;
the flow value after the detection equipment of gas mixing export cooperation temperature pressure compensation controls the online regulating valve aperture of high low concentration gas trachea jointly, and then controls the low concentration gas volume flow according to the change of the tolerance, carries out the online regulation and the automatic following of low concentration gas, realizes final accurate ratio. Conventional gas mixing equipment all adopts component content analyzer to change and accomplishes automatic dynamic adjustment of following, and numerical value fluctuation is very difficult to realize fast and stable regulation when equipment initial stage starts, and two kinds of gas flow signals of this system introduction carry out preliminary coarse adjustment, can find initial gas mixing balance point fast according to the flow ratio for finally carry out the accurate adjustment according to methane content and realize fast and steadily.
Because the gas consumption of the system has larger fluctuation, the low-concentration gas pipeline is designed into a large flow path and a small flow path, and the flow meter and the regulating valve of the large flow path are 1000-8000Nm3The metering and regulating accuracy of/h is selected, the small flow path flowmeter and regulating valve are according to 200-1000Nm3The metering and regulating precision of/h is selected, and the automatic control system is 1000Nm according to the flow value of the follow-up gas3The pneumatic emergency cut-off valve for each inlet of the h automatic switch is used for switching the big and small paths, so that the accuracy and the stability of gas mixing are ensured to the maximum extent.
The volume concentration of methane in air reaches 5-15%, namely the methane enters an explosion limit, the concentration of methane in low-concentration gas is 15% -20%, the methane is very close to an explosion point, the uniformity of mixed gas is ensured, the concentration of methane in the mixed gas is far away from the explosion limit, high-concentration gas and low-concentration gas enter a static mixer together for mixing, the static mixer is designed to be three-stage mixed, a draft tube is arranged at an inlet of the low-concentration gas, the diffused low-concentration gas and the main-path high-concentration gas are primarily mixed, the two primarily mixed gases are swirled by a vortex device to complete secondary mixing, the two gases are fully mixed by a plurality of groups of metal plate corrugated filler turbulence generators at the rear end of the static mixer to complete third mixing, the mixing precision of the mixed gases reaches more than 98% after triple mixing, an instrument valve and a differential pressure meter are arranged on a static mixer body, a blow-down valve is arranged at the lower low point.
The low-concentration methane gas is very close to the explosion limit, so the flow and pressure stability of the low-concentration methane gas must be well controlled, the danger is avoided, a wet-type bleeding valve group is arranged at the pipeline inlet of the low-concentration methane gas, a manual valve circuit is arranged, an automatic regulating valve circuit and the wet-type bleeding valve circuit are connected in parallel for use, three-level joint control is realized according to pressure fluctuation of a pipe network, and the stability of the system is ensured.
The detection equipment for each path of gas inlet and mixed gas outlet comprises: the system comprises a temperature transmitter, a pressure transmitter, each inlet methane content analyzer and a mixed gas outlet double-methane content analyzer (the two are arranged in parallel, any value exceeds the limit, and the control system is interlocked, cut off and shut down).
A mine gas safety blending system comprising:
the PLC control cabinet is provided with a touch screen and is used for displaying the temperature and pressure of an inlet and an outlet of the equipment, the methane content of the inlet and the outlet and the state of a valve, the opening size of a regulating valve, the numerical value of flow and the numerical value of a gas leakage alarm and performing interlocking control; 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.
The whole gas mixing process PLC control cabinet automatically controls the regulating valve according to the acquired flow value and the methane gas concentration; and monitoring the outlet, the temperature, the pressure and the outlet gas methane concentration in real time in the gas mixing process, and setting the required linkage protection according to the downstream methane content requirement when the outlet gas concentration is reported low and high, and the outlet temperature and the pressure are reported low and high.
The low concentration gas utilizes gas mixing system includes:
low methane concentration gas pipeline device: the source low concentration gas gets into mixes gas pipeline and divide into two way parallelly connected uses of big small flow behind entry butterfly valve, wet-type diffusion valves, the instrumentation, and every way all is equipped with manual butterfly valve, pneumatic trip valve, measures the flow through the flowmeter, and the rethread regulating valve adjusts the low concentration gas quantity and gets into and mix the gas device through the export butterfly valve after, pipeline diameter DN 700.
High methane concentration gas pipeline device: high-concentration gas at the source enters a gas mixing pipeline, passes through an inlet butterfly valve, a detection instrument and a pneumatic stop valve, and enters a gas mixing device from an adjusting valve to an outlet butterfly valve after being measured by a flowmeter, wherein the diameter of the pipeline is DN 800.
A gas mixing device: for the high-efficient static mixer that is furnished with triple gas mixing device, the flow value after the instrumentation cooperation temperature pressure compensation of gas mixing export controls two kinds of gas inlet pipelines adjusting valve aperture jointly, controls low concentration gas volume flow, carries out the online adjustment and the automatic following of gas mixing concentration, realizes the accurate ratio of high concentration and low concentration gas, pipeline diameter DN 900.
Low methane concentration gas pipeline wet-type valve group device that diffuses includes:
the three paths of the gas pipeline system are connected in parallel, one path is a manual butterfly valve path, pressure relief can be manually opened when the pressure of a pipe network is ultrahigh, the other path is an automatic regulating valve path, the pressure signal of the pipe network is transfinite, a control system is interlocked with an automatic regulating valve, the valve port is automatically opened for pressure relief, the pressure is higher, the opening degree of the valve port is larger, if the pressure of the pipe network is ultrahigh, the wet-type bleeding valve is automatically opened for pressure relief, three-level joint control is realized according to pressure fluctuation of the pipe network, the stability of the system is ensured.
Low methane concentration gas pipeline, high methane concentration gas pipeline and mist outlet pipeline all set up combustible gas and reveal alarm probe, in case there is the gas to leak and reach certain concentration, 20% of the explosion range line, control system audible-visual alarm cuts off each way gas emergency cut-off valve simultaneously, ensures system work safety.
The gas mixing device comprises: high low concentration gas gets into static mixer jointly and mixes, set up the honeycomb duct at low concentration gas entry, the low concentration gas that will diffuse out and main road high concentration gas mix for the first time, two kinds of gas carry out the whirl through vortex device after mixing for the first time, accomplish the second time and mix, the multiunit metal sheet ripple filler turbulence generator in static mixer mixes two kinds of gas fully each other, accomplish the third time and mix, after the triple mixes, the gas mixture precision reaches more than 98%, set up instrument valve and differential pressure table on the static mixer body, the below low point sets up the blowoff valve. The rear pipeline is provided with a double-channel methane component content online analyzer, and the rear pipeline is provided with a pressure transmitter, a temperature transmitter, a mixed gas pipeline pressure gauge, a mixed gas thermometer, a mixed gas total flow meter, an outlet manual butterfly valve and the like.
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 (10)
1. The utility model provides a mine gas safety blending system which characterized in that, mine gas safety blending system is provided with: the device is used for displaying the temperature and pressure of an inlet and an outlet of the device, the methane content of the inlet and the outlet and the state of a valve, the opening size of a regulating valve, the flow numerical value and the numerical value of a gas leakage alarm and performing interlocking control; the PLC control cabinet is used for parameter setting, historical alarm query and data report query;
the industrial personal computer is connected with the PLC control cabinet and is used for automatically controlling the field gas mixing device and safely cutting off and protecting the field gas mixing device;
a low-methane-concentration gas pipeline device is characterized in that source low-concentration gas enters a gas mixing pipeline and is divided into two paths of large and small flows to be connected in parallel for use after passing through an inlet butterfly valve, a wet type bleeding valve group and a detection instrument, each path is provided with a manual butterfly valve and a pneumatic stop valve, the flow is measured through a flow meter, the low-concentration gas is adjusted through an adjusting valve, and then the low-concentration gas enters the gas mixing device through an outlet butterfly valve;
in the high-methane concentration gas pipeline device, high-concentration gas from a source enters a gas mixing pipeline, passes through an inlet butterfly valve, a detection instrument and a pneumatic stop valve, is metered by a flowmeter, passes through an adjusting valve to an outlet butterfly valve and enters a gas mixing device;
the gas mixing device is provided with a high-efficiency static mixer of the triple gas mixing device, a detection instrument of a gas mixing outlet is matched with a flow value after temperature and pressure compensation to jointly control the opening degree of an adjusting valve on an inlet pipeline of two gases, the volume flow of the low-concentration gas is controlled, the online adjustment and the automatic following of the gas mixing concentration are carried out, and the accurate proportioning of the high-concentration gas and the low-concentration gas is realized.
2. The mine gas safety blending system of claim 1, wherein the low methane concentration gas safety relief pipeline is provided with three parallel paths, one path is a manual butterfly valve path, when the pressure of the pipe network is ultrahigh, the pressure relief can be manually opened, the other path is an automatic regulating valve path, the pressure signal of the pipe network is out of limit, the control system is interlocked with an automatic regulating valve, the valve port is automatically opened for pressure relief, the higher the pressure is, the larger the opening degree of the valve port is, if the pressure of the pipe network is ultrahigh, the wet relief valve is automatically opened for pressure relief, three-level joint control is realized according to the pressure fluctuation of the pipe network, the stability of the system is ensured, and the released gas enters a station area relief tower.
3. The mine gas safety blending system of claim 1, wherein the low methane concentration gas line device and the high methane concentration gas line device are both provided with a combustible gas leakage alarm probe, and the combustible gas leakage alarm probe is connected with a system audible and visual alarm device and each path of gas emergency shut-off valve.
4. The mine gas safety blending system of claim 1, wherein the gas mixing device is configured to mix high and low concentration gas together in a static mixer, a draft tube is provided at the low concentration gas inlet to primarily mix the diffused low concentration gas with the main high concentration gas, the two primarily mixed gases are swirled by a swirling device to complete the second mixing, the two gases are fully mixed by a plurality of groups of metal plate corrugated filler turbulence generators in the static mixer to complete the third mixing, after the triple mixing, the gas mixing precision of the mixed gas reaches more than 98%, an instrument valve and a differential pressure gauge are provided on the static mixer body, and a blow-down valve is provided at a lower low point.
5. The mine gas safe blending system of claim 1, wherein the pipeline behind the gas mixing device is provided with a double-channel methane component content online analyzer, and the online analyzer is connected with a pressure transmitter, a temperature transmitter, a mixed gas pipeline pressure gauge, a mixed gas thermometer, a mixed gas total flow meter and an outlet manual butterfly valve.
6. The mine gas safe blending system of claim 1, wherein the pneumatic shut-off valves of the low methane concentration gas line device and the high methane concentration gas line device are interlocked with respective gas inlet and outlet pressures, temperature transmitters and automatic detection alarms of a methane content analyzer, and the pneumatic shut-off valves automatically shut off the high and low concentration gas sources when the numerical value exceeds a set value plus or minus 10%;
and the low-methane-concentration gas pipeline device and the high-methane-concentration gas pipeline device outlet pressure transmitter monitor the gas-conditioned pressure of the high-methane-concentration gas and the low-methane-concentration gas in real time, and when the numerical value exceeds the range of plus or minus 10 percent of a set value, the control system gives an alarm.
7. The mine gas safe blending system of claim 1, wherein the low-concentration gas flow meter in the low-methane-concentration gas pipeline device controls the opening and closing degree of the low-concentration gas outlet regulating valve, controls the flow rate of the low-concentration gas according to the blending requirement by comparing the flow rate value of the high-concentration gas, and realizes the blending ratio requirement value.
8. The mine gas safety blending system of claim 7, wherein the proportioning requirements are high-concentration gas output: 500-13000Nm3The methane concentration is 40-50%;
the output of the low-concentration gas is as follows: 200-8000Nm3The methane concentration is 15-20%; the methane content after mixing must be guaranteed to be more than 25%.
9. A gas blending ratio control method for realizing the mine gas safety blending system of any one of claims 1 to 8, characterized in that the gas blending ratio control method comprises the following steps:
the pneumatic cut-off valves on the low-methane concentration gas pipeline device and the high-methane concentration gas pipeline device are interlocked with respective gas inlet and outlet pressure, a temperature transmitter and an automatic detection alarm of a methane content analyzer, and when the numerical value exceeds the positive and negative 10% of a set value, the pneumatic cut-off valves automatically close and cut off the high-low concentration gas source;
the high-low concentration gas pipeline outlet pressure transmitter monitors the gas-conditioned pressure of high-methane concentration and low-methane concentration gas in real time, and when the numerical value exceeds the range of plus or minus 10 percent of a set value, the control system gives an alarm;
the low-concentration gas flowmeter controls the opening and closing degree of the low-concentration gas outlet regulating valve, compares the high-concentration gas flow value, and controls the flow of the low-concentration gas according to the matching requirement to realize the required value of gas mixing matching;
the detection equipment of the mixed gas outlet is matched with the flow value after temperature and pressure compensation to jointly control the opening of the on-line regulating valve of the high-concentration gas pipe and the low-concentration gas pipe, so that the accumulated flow of the low-concentration gas is controlled according to the change of the gas consumption, the on-line regulation and automatic following of the low-concentration gas are carried out, and the final proportioning is realized.
10. The gas mixing and proportioning control method of claim 9, wherein the gas mixing device at the gas mixing outlet uses the change of a component content analyzer to complete automatic following dynamic adjustment, uses two gas flow signals to carry out preliminary coarse adjustment, and quickly finds an initial gas mixing balance point according to the flow ratio, so that the final fine adjustment according to the methane content is quickly and stably realized;
high low concentration gas gets into static mixer jointly and mixes, static mixer carries out tertiary mixing design, set up the honeycomb duct at low concentration gas entry, the low concentration gas that will diffuse out and main way high concentration gas carry out the primary mixing, two kinds of gaseous processes whirl through vortex device after mixing just, accomplish the secondary and mix, the multiunit metal sheet ripple packing turbulence generator through the static mixer rear end again is with two kinds of gaseous abundant intermixtures, accomplish the tertiary and mix, triple after mixing, the gas mixing precision reaches more than 98%, set up instrument valve and differential pressure table on the static mixer body, the below low point sets up the blowoff valve.
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