CN105498563A - Coal-mine gas mixing system and mixing method - Google Patents
Coal-mine gas mixing system and mixing method Download PDFInfo
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- CN105498563A CN105498563A CN201511024687.3A CN201511024687A CN105498563A CN 105498563 A CN105498563 A CN 105498563A CN 201511024687 A CN201511024687 A CN 201511024687A CN 105498563 A CN105498563 A CN 105498563A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
- B01F23/19—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
- B01F33/823—Combinations of dissimilar mixers in two or more alternative mixing receptacles, e.g. mixing in one receptacle and dispensing from another receptacle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/834—Mixing in several steps, e.g. successive steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/84—Mixing plants with mixing receptacles receiving material dispensed from several component receptacles, e.g. paint tins
- B01F33/846—Mixing plants with mixing receptacles receiving material dispensed from several component receptacles, e.g. paint tins using stored recipes for determining the composition of the mixture to be produced, i.e. for determining the amounts of the basic components to be dispensed from the component receptacles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/82—Forming a predetermined ratio of the substances to be mixed by adding a material to be mixed to a mixture in response to a detected feature, e.g. density, radioactivity, consumed power or colour
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/83—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
- B01F35/831—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices using one or more pump or other dispensing mechanisms for feeding the flows in predetermined proportion, e.g. one of the pumps being driven by one of the flows
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
- B01F35/883—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using flow rate controls for feeding the substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/501—Mixing combustion ingredients, e.g. gases, for burners or combustion chambers
Abstract
The invention discloses a coal-mine gas mixing system and a mixing method and belongs to the technical field of a coal-mine safety device. The coal-mine gas mixing system comprises a gas pump station and a high-concentration gas power station, a low-concentration gas power station and a coal-fired boiler which are respectively communicated with the gas pump station through a pipeline, wherein a tee-joint mixer is arranged on the pipeline and comprises a high-concentration gas pipe opening, a low-concentration gas pipe opening and a mixed gas pipe opening; the high-concentration gas pipe opening and the low-concentration gas pipe opening are communicated with the gas pump station through a high-concentration gas pipeline and a low-concentration gas pipeline, respectively. The coal-mine gas mixing system has the advantages that the tee-joint mixer, a gas ejector, a gas mixer, a ventilation mixer and a ventilation last-stage mixer are utilized to form various mixing modes; gas with concentration lower than 8% can be effectively utilized; the problems of low safety, low efficiency and uneconomic effect of coal-mine gas utilization in China at present are solved.
Description
Technical field
The invention belongs to safety of coal mines device technique field, be specifically related to coal mine gas mixing system and compounding method.
Background technology
Leave unused along with the continuous reduction of mine mash gas extraction concentration in the high concentration gas power station that colliery is built in advance, high concentration gas generating set cannot run generating; Low concentration gas power station exceeds low concentration generating set lower limit and the generating that cannot operate lower than 8% due to mash gas extraction concentration; Come from the ventilation air gas of coal mine ventilation system simultaneously, major part methane content is usually less than 0.3%, even if adopt regenerative oxidation to utilize technology also substantially cannot utilize, is directly entered air by as waste gas, according to relevant statistics, China's coal-mine gas electricity station Homes Using TV is less than 50%; The annual gas emission of China's coal-mine about has 80% ~ 90% to discharge in mine ventilation mode, and the methane content entered in air by weary wind for 2008 has reached 16,100,000,000 m more to have data to show
3.Therefore, present gas utilization efficiency is lower, very uneconomical.Formed while be that clean energy resource effectively can not utilize, can not produce economic benefit and another side causes the greenhouse gases effect of 21 times of carbon dioxide, the general layout of welding.
The gas utilization poor stability of above-mentioned existence, poor efficiency, uneconomic problem, manyly all solve by gas mixture.
Current gas hybrid technology, Jin Youji company is in laboratory, apply among a small circle, mixing apparatus is single, range of application is narrow, and do not design gas mixing arrangement according to colliery actual production feature, do not form the mixed gas system and system compounding method that can adapt to kinds of gas sources condition, the industrial applications needs of atm number, the wide scope of application cannot be met.Therefore, need the gas compounding method of development system, form the gas mixing system of system, realize efficient, the economical operation of gas utilization..
Summary of the invention
In view of this, the object of the present invention is to provide the gas mixing system that a kind of pressure stability, drag losses are little, mixture is effective, automaticity is high, and use this system to carry out the method for mixture, there is poor stability, poor efficiency, uneconomic problem to solve prior art.
An object of the present invention is achieved through the following technical solutions:
Coal mine gas mixing system and compounding method, comprise gas pump station and respectively with the high concentration gas power station of described gas pump station by pipeline connection, low concentration gas power station and coal-burning boiler, pipeline is provided with triplet type mixing machine, described triplet type mixing machine comprises the high concentration gas mouth of pipe, the low concentration gas mouth of pipe and the mixing gas mouth of pipe, the described high concentration gas mouth of pipe, the low concentration gas mouth of pipe and gas pump station are respectively by high concentration gas pipeline, low concentration gas pipeline connection, the described mixing gas mouth of pipe respectively with high concentration gas power station, low concentration gas power station and coal-burning boiler are communicated with, the pipeline be communicated with high concentration gas power station is provided with gas injector and gas mixing machine, described gas injector is communicated with coal bed gas transmission & distribution station, the front end of described gas mixing machine is connected with the mixing gas mouth of pipe of described triplet type mixing machine, rear end is also communicated with described coal-burning boiler, be provided with weary wind mixing machine and weary wind final stage mixing machine with stating on pipeline that coal-burning boiler is communicated with, also comprise the weary wind collecting hood be communicated with described weary wind mixing machine and the weary wind oxidation unit be arranged on weary wind mixing machine and coal-burning boiler connecting pipeline.
Further, the air draught machine be communicated with described gas mixing machine is also comprised.
Further, the high concentration coal seam controlled atmosphere depressor be arranged on gas injector and coal bed gas transmission & distribution station connecting pipeline is also comprised.
Further, also comprise and be arranged on pipeline and can carry out independent the jettron valve, motor regulated valve and the evacuated tube that control to each functional part, the pipeline between the evacuated tube and gas mixing machine of gas mixing machine front end is provided with wet type regulator.
Further, also to comprise on the pipeline that is arranged between triplet type mixing machine with gas injector and the light concentration mash gas safety support equipment be communicated with high concentration gas power station, low concentration gas power station and coal-burning boiler respectively, described light concentration mash gas safety support equipment comprises anti-backflow device, explosion arrestment valve, dry type venting of dust explosion device, automatic powder spraying explosion suppressor and the water-sealing fire-retardant explosion venting device of connecting successively.
Further, the high concentration gas mouth of pipe of described triplet type mixing machine and the low concentration gas mouth of pipe are that angle 30 ° is arranged, in high-concentration and low-concentration device in Gas, intersection arranges flow distribution plate, by the device in Gas flow velocity of the high concentration gas mouth of pipe and the low concentration gas mouth of pipe respectively lower than 10m/s.
Further, described gas injector comprises injection section, mixing section and diffuser, the high concentration coal seam gas blowout mouth of described injection section and the angle of the low concentration gas mouth of pipe are that angle 30 ° is arranged, described mixing section adopts central angle to be that 90 ° of bend pipes are arranged, the expulsion pressure 0.3-0.4MPa of described high concentration coal seam gas blowout mouth.
Further, described weary wind final stage mixing machine device is provided with the V-type flow distribution plate of multilayer stainless steel, and the spacing of every layer of flow distribution plate is 20mm.
Further, described wet type regulator comprises wet type cylindrical shell, level sensor, relief tube, magnetic flap level gauge and controller, and its pressure regulation height of water level maximum is 1000mm.
Two of object of the present invention is achieved through the following technical solutions:
Above-mentioned coal mine gas mixing system is adopted to carry out the compounding method of coal mine gas:
High and low for gas pump station concentration gas mixture becomes low concentration gas as the ejection gas of gas injector by triplet type mixing machine, gas injector is elevated pressures transmission & distribution high concentration coal bed gas and low concentration gas injection, the high concentration gas formed after injection is as the source of the gas of gas mixing machine, the generating of high concentration electric station is entered after mixture is even, or
High and low for gas pump station concentration gas mixture becomes low concentration gas as the ejection gas of low concentration gas power station source of the gas or gas injector by triplet type mixing machine, gas injector is elevated pressures transmission & distribution high concentration coal bed gas and low concentration gas injection, the low concentration gas formed after injection for low concentration power station, or
Triplet type mixing machine is high by gas pump station, low concentration gas mixture becomes low concentration gas as the mist of gas mixing machine, the low concentration gas mixed is as after the source gas of weary wind mixing machine and mine air-lack mixture, enter after weary wind final stage mixing machine mixes, enter weary wind oxidation unit or coal-burning boiler utilization, or during mine return air well main air blower returns wind or two main air blowers switch, namely cannot provide weary landscape condition from weary wind collecting hood, triplet type mixing machine is high by gas pump station, about the air provided by gas mixing machine and air draught machine after low concentration gas mixture becomes low concentration gas is directly mixed to about 1% or 2% concentration, as the gas source of the gas that weary wind oxidation unit or coal-burning boiler utilize,
Wherein, triplet type mixing machine, gas injector, gas mixing machine, weary wind mixing machine are the mixing match of two kinds of gases, its mixture concentration C
1, C
2computing formula is as follows:
C
mixed---mixture after gas gas concentration;
Q1---the first device in Gas flow;
C1---the first mash gas concentration;
Q2---the second device in Gas flow;
C2---the second mash gas concentration;
Mixture unevenness coefficient formulas:
σ---the degree of irregularity of characterizing sample device in Gas;
C
i---the concentration value of i-th sample gas;
---the mean value of statistics sample gas;
N---sample size.
Beneficial effect of the present invention is:
1, the present invention is by the united application of triplet type mixing machine, gas injector, gas mixing machine, weary wind mixing machine and weary wind final stage mixing machine, multiple mixture mode can be formed, take full advantage of concentration lower than the methane gas of 8%, solve poor stability in current China's coal-mine gas utilization, low, the uneconomic problem of efficiency.
2, the present invention adopts the compounding method of low concentration gas and air, weary wind can be made to be oxidized utilize and coal-burning boiler device continuously, stable operation, improve its efficiency, increase economy.
3, gas injector of the present invention, injection pressure is less, and injection mixture uniformity is good, after employing high concentration coal bed gas compounding method, can improve Homes Using TV and the generating efficiency in high concentration gas power station; The generating efficiency in low concentration power station can be improved.
4, triplet type mixing machine of the present invention, drag losses is little, and degree of mixing is good, to gas pumping pump without safety effects.
5, weary wind final stage mixing machine of the present invention, adopt collision and the flow-disturbing method of V-type flow distribution plate, mixture homogeneity is high, on ventilation main fan resistance without impact, has dehydration, dedusting function simultaneously.
6, wet type regulator of the present invention has on-line automatic adjustment pipeline discharge pressure and automatic safe pressure protect concurrently; improve low concentration gas delivery safety; the water-sealing fire-retardant explosion venting device arranged, automatic powder spraying explosion suppressor and automatic explosion arrestment door effectively can stop explosive flame, achieve low concentration gas and normally carry.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or can be instructed from the practice of the present invention.Target of the present invention and other advantages can be realized by description below and obtain.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is system schematic of the present invention;
Fig. 2 is the structural representation of threeway mixing machine;
Fig. 3 is the structural representation of gas injector;
Fig. 4 is the structural representation of weary wind final stage mixing machine.
Reference numeral:
1-air draught machine, 2-air flow sensor, 3-air carbon steel pipeline, 4-air evacuated tube, 5-jettron valve, 6-motor regulated valve, 7-gas mixing machine, 8-triplet type mixing machine, the 81-high concentration gas mouth of pipe, the 82-low concentration gas mouth of pipe, the 83-mixing gas mouth of pipe, 84-flow distribution plate, 9-low concentration gas flow, concentration, manometer, 10-anti-backflow device, 11-explosion arrestment valve, 12-dry type venting of dust explosion device, 13-automatic powder spraying explosion suppressor, 14-water-sealing fire-retardant explosion venting device, 15-high concentration gas flow, concentration, manometer, 16-high concentration coal seam controlled atmosphere depressor, 17-jettron valve, 18-gas injector, 181-injection section, 182-mixing section, 183-diffuser, 184-high concentration coal seam gas blowout mouth, 185-low concentration gas spout, 19-wet type regulator, 20-gas carbon steel pipeline, the weary wind mixing machine of 21-, the weary wind pressure sensor of 22-, the weary wind concentration sensor of 23-, the weary air pipe line of 24-, 25-weary wind final stage mixing machine, the weary wind evacuated tube of 26-, the weary wind flow of 27-, concentration, manometer, the weary wind collecting hood of 28-, 29-low concentration power station evacuated tube, 30-high concentration power station evacuated tube, 31-V type flow distribution plate, 32-gas pump station, 33-high concentration gas power station, 34-low concentration gas power station, 35-coal-burning boiler, the weary wind oxidation unit of 36-, 37-coal bed gas transmission & distribution station.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
1, coal mine gas mixing system
As shown in Figure 1, the coal mine gas mixing system of the present embodiment comprise gas pump station 32 and respectively with the high concentration gas power station 33 of described gas pump station 32 by pipeline connection, low concentration gas power station 34 and coal-burning boiler 35, pipeline is provided with triplet type mixing machine 8, as shown in Figure 2, described triplet type mixing machine 8 comprises the high concentration gas mouth of pipe 81, the low concentration gas mouth of pipe 82 and the mixing gas mouth of pipe 83, the described high concentration gas mouth of pipe 81, the low concentration gas mouth of pipe 82 and gas pump station are respectively by high concentration gas pipeline, low concentration gas pipeline connection, high concentration gas pipeline is provided with high concentration gas flow, concentration, manometer 15, the described mixing gas mouth of pipe 83 respectively with high concentration gas power station, low concentration gas power station and coal-burning boiler are communicated with, the pipeline be communicated with high concentration gas power station is provided with gas injector 18 and gas mixing machine 7, described gas injector 18 is communicated with coal bed gas transmission & distribution station 37, the front end of described gas mixing machine 7 is connected with the mixing gas mouth of pipe 83 of described triplet type mixing machine 8, rear end is also communicated with described coal-burning boiler, be provided with weary wind mixing machine 7 and weary wind final stage mixing machine 25 with stating on pipeline that coal-burning boiler is communicated with, also comprise the weary wind collecting hood 28 be communicated with described weary wind mixing machine 7 and the weary wind oxidation unit 36 be arranged on weary wind mixing machine 7 and coal-burning boiler connecting pipeline, on the weary air pipe line 24 be communicated with weary wind collecting hood 28, be provided with weary wind pressure sensor 22 and weary wind concentration sensor 23, the pipeline be communicated with weary wind oxidation unit 36 is also provided with weary wind flow, concentration, manometer 27.
As the improvement of the present embodiment, gas mixing machine 21 front end arranges an air draught machine 1, and is provided with an air evacuated tube 4.
As the improvement of the present embodiment, also comprise and be arranged on gas injector 18 and the high concentration coal seam controlled atmosphere depressor 16 on the connecting pipeline of coal bed gas transmission & distribution station.
As the improvement of the present embodiment, also comprise and be arranged on pipeline and can carry out the independent jettron valve controlled to each functional part, motor regulated valve and evacuated tube, as shown in Figure 1, be arranged on the jettron valve I5 between air draught machine and gas mixing machine, motor regulated valve I6 and the jettron valve I17 etc. be arranged between coal bed gas dispensing station and gas injector 18, be arranged on the evacuated tube I26 before burning boiler, be arranged on the evacuated tube III30 before the evacuated tube II29 before low concentration gas power station and high concentration gas power station, each functional part can independently be run, can mutually combination and cooperation run, mutually can switch between separately again.
As the improvement of the present embodiment, also to comprise on the pipeline that is arranged between triplet type mixing machine 8 with gas injector 18 and the light concentration mash gas safety support equipment be communicated with high concentration gas power station, low concentration gas power station and coal-burning boiler respectively, it comprises anti-backflow device 10, explosion arrestment valve 11, dry type venting of dust explosion device 12, automatic powder spraying explosion suppressor 13, the water-sealing fire-retardant explosion venting device 14 of connecting successively.
As the improvement of the present embodiment, the high concentration gas mouth of pipe 81 of triplet type mixing machine 8 is arranged in angle 30 ° with the low concentration gas mouth of pipe 82, in high-concentration and low-concentration device in Gas, intersection arranges flow distribution plate 84, as shown in Figure 2, by the device in Gas flow velocity of the high concentration gas mouth of pipe and the low concentration gas mouth of pipe respectively lower than 10m/s.
As the improvement of the present embodiment, gas injector 18 comprises injection section 181, mixing section 182 and diffuser 183, the high concentration coal seam gas blowout mouth 184 of described injection section 181 is that angle 30 ° is arranged with the angle of low concentration gas spout 185, as shown in Figure 3, described mixing section 182 adopts central angle to be that 90 ° of bend pipes are arranged, the expulsion pressure 0.3-0.4MPa of described high concentration coal seam gas blowout mouth 184.
As the improvement of the present embodiment, weary wind final stage mixing machine 21 is provided with the V-type flow distribution plate 31 of multilayer stainless steel, the spacing of every layer of flow distribution plate is 20mm, as shown in Figure 4, weary general mood not high for weary wind mixing machine 21 degree of mixing is passed into weary wind final stage mixing machine 25, adopt collision and the flow-disturbing method of V-type flow distribution plate, weary wind is divided into the weary general mood of multiply, adopts centrifugal and mechanical head-on collision method weary general mood to be mixed into the uniform weary general mood of methane concentration subsequently; Weary wind final stage mixing machine 25 can remove aqueous water and dust; V-type flow distribution plate selects stainless steel, can antirust raising its service life, and between flow distribution plate, spacing is 20mm, makes it have enough and the flowing space of not wasting, increases its mobility.
As the improvement of the present embodiment, wet type regulator 19 comprises wet type cylindrical shell, level sensor, relief tube, magnetic flap level gauge and controller, and its pressure regulation height of water level maximum is 1000mm.
2, above-mentioned coal mine gas mixing system is adopted to carry out the compounding method of coal mine gas:
Gas transfer pipeline arranges triplet type mixing machine 8, gas injector 18, gas mixing machine 7, weary wind mixing machine 21 and weary wind final stage mixing machine 25, auto-control motor regulated valve 6 aperture controls gas density and the gas flow of each functional part triplet type mixing machine 8, gas injector 18, gas mixing machine 7, weary wind mixing machine 21 and weary wind final stage mixing machine 25, makes device in Gas enter gas power station, the oxidation of weary wind and coal-burning boiler.
A kind of compounding method comprises: high and low for gas pump station concentration gas mixture becomes low concentration gas as the ejection gas of gas injector 18 by triplet type mixing machine 8, gas injector 18 is elevated pressures transmission & distribution high concentration coal bed gas and low concentration gas injection, the high concentration gas formed after injection, as the source of the gas of gas mixing machine 7, enters the generating of high concentration electric station after mixture is even; Two kinds of compounding methods comprise: high and low for gas pump station concentration gas mixture becomes low concentration gas as the ejection gas of low concentration gas power station source of the gas or gas injector 18 by triplet type mixing machine 8, gas injector 18 is elevated pressures transmission & distribution high concentration coal bed gas and low concentration gas injection, and the low concentration gas formed after injection is for low concentration power station; Three kinds of compounding methods comprise: high and low for gas pump station concentration gas mixture becomes low concentration gas as the mist of gas mixing machine 7 by triplet type mixing machine (8), the low concentration gas mixed is as after the source gas of weary wind mixing machine 21 and mine air-lack mixture, enter after weary wind final stage mixing machine 25 mixes, enter weary wind oxidation unit or coal-burning boiler utilizes.During mine return air well main air blower returns wind or two main air blowers switch, namely cannot provide weary landscape condition from weary wind collecting hood 28, about the air provided by gas mixing machine 7 and air draught machine 1 after high and low for gas pump station concentration gas mixture is become low concentration gas by triplet type mixing machine 8 is directly mixed to about 1% or 2% concentration, as the gas source of the gas that weary wind oxidation unit or coal-burning boiler utilize.
Embodiment 1
Conveying low concentration mixing gas total amount 105Nm
3/ min, conveying low concentration gas CH
4concentration is 5%, and conveying low concentration gas scale is 5.25Nm
3/ min, air blower conveying air maximum is 140Nm
3/ min, CH after the blending of gas mixing machine
4concentration lower than 2.14%, weary wind CH
4concentration is 0.20%, the weary wind flow 1000Nm of weary wind mixing machine
3/ min, after the blending of weary wind mixing machine, concentration is 0.725%, by weary wind final stage mixing machine for catalytic oxidizing equipment water heating.
Embodiment 2
Conveying high concentration gas flow 4000Nm
3/ h, concentration 32%, conveying low concentration gas flow 2629Nm
3/ h, concentration 11.83%, after the blending of triplet type mixing machine, conveying low concentration mixing gas total flow 6629Nm
3/ h, conveying low concentration gas CH
4concentration is 24%, coal bed gas transmission & distribution station high concentration coal seam throughput 947Nm
3/ h, high concentration coal bed gas concentration 96%, the maximum flow capacity of gas injector is 8000Nm
3/ h, injection after gas concentration is 33%, gas mixing machine blending flow 8000Nm
3/ h, blending gas density is 33%, generates electricity for high concentration gas generating set.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (10)
1. coal mine gas mixing system, it is characterized in that: comprise gas pump station and respectively with the high concentration gas power station of described gas pump station by pipeline connection, low concentration gas power station and coal-burning boiler, pipeline is provided with triplet type mixing machine, described triplet type mixing machine comprises the high concentration gas mouth of pipe, the low concentration gas mouth of pipe and the mixing gas mouth of pipe, the described high concentration gas mouth of pipe, the low concentration gas mouth of pipe and gas pump station are respectively by high concentration gas pipeline, low concentration gas pipeline connection, the described mixing gas mouth of pipe respectively with high concentration gas power station, low concentration gas power station and coal-burning boiler are communicated with, the pipeline be communicated with high concentration gas power station is provided with gas injector and gas mixing machine, described gas injector is communicated with coal bed gas transmission & distribution station, the front end of described gas mixing machine is connected with the mixing gas mouth of pipe of described triplet type mixing machine, rear end is also communicated with described coal-burning boiler, be provided with weary wind mixing machine and weary wind final stage mixing machine with stating on pipeline that coal-burning boiler is communicated with, also comprise the weary wind collecting hood be communicated with described weary wind mixing machine and the weary wind oxidation unit be arranged on weary wind mixing machine and coal-burning boiler connecting pipeline.
2. coal mine gas mixing system according to claim 1, is characterized in that: also comprise the air draught machine be communicated with described gas mixing machine.
3. coal mine gas mixing system according to claim 1, is characterized in that: also comprise the high concentration coal seam controlled atmosphere depressor be arranged on gas injector and coal bed gas transmission & distribution station connecting pipeline.
4. coal mine gas mixing system according to claim 1 and compounding method, it is characterized in that: also comprise and be arranged on pipeline and can carry out independent the jettron valve, motor regulated valve and the evacuated tube that control to each functional part, the pipeline between the evacuated tube and gas mixing machine of gas mixing machine front end is provided with wet type regulator.
5. coal mine gas mixing system according to claim 1, it is characterized in that: also to comprise on the pipeline that is arranged between triplet type mixing machine with gas injector and the light concentration mash gas safety support equipment be communicated with high concentration gas power station, low concentration gas power station and coal-burning boiler respectively, described light concentration mash gas safety support equipment comprises anti-backflow device, explosion arrestment valve, dry type venting of dust explosion device, automatic powder spraying explosion suppressor and the water-sealing fire-retardant explosion venting device of connecting successively.
6. coal mine gas mixing system according to claim 1, it is characterized in that: the high concentration gas mouth of pipe of described triplet type mixing machine and the low concentration gas mouth of pipe are that angle 30 ° is arranged, in high-concentration and low-concentration device in Gas, intersection arranges flow distribution plate, by the device in Gas flow velocity of the high concentration gas mouth of pipe and the low concentration gas mouth of pipe respectively lower than 10m/s.
7. coal mine gas mixing system according to claim 1, it is characterized in that: described gas injector comprises injection section, mixing section and diffuser, the high concentration coal seam gas blowout mouth of described injection section and the angle of the low concentration gas mouth of pipe are that angle 30 ° is arranged, described mixing section adopts central angle to be that 90 ° of bend pipes are arranged, the expulsion pressure 0.3-0.4MPa of described high concentration coal seam gas blowout mouth.
8. coal mine gas mixing system according to claim 1, is characterized in that: described weary wind final stage mixing machine device is provided with the V-type flow distribution plate of multilayer stainless steel, and the spacing of every layer of flow distribution plate is 20mm.
9. coal mine gas mixing system according to claim 1, is characterized in that: described wet type regulator comprises wet type cylindrical shell, level sensor, relief tube, magnetic flap level gauge and controller, and its pressure regulation height of water level maximum is 1000mm.
10. adopt the arbitrary described coal mine gas mixing system of claim 1-9 to carry out the compounding method of coal mine gas, it is characterized in that:
High and low for gas pump station concentration gas mixture becomes low concentration gas as the ejection gas of gas injector by triplet type mixing machine, gas injector is elevated pressures transmission & distribution high concentration coal bed gas and low concentration gas injection, the high concentration gas formed after injection is as the source of the gas of gas mixing machine, the generating of high concentration electric station is entered after mixture is even, or
High and low for gas pump station concentration gas mixture becomes low concentration gas as the ejection gas of low concentration gas power station source of the gas or gas injector by triplet type mixing machine, gas injector is elevated pressures transmission & distribution high concentration coal bed gas and low concentration gas injection, the low concentration gas formed after injection for low concentration power station, or
Triplet type mixing machine is high by gas pump station, low concentration gas mixture becomes low concentration gas as the mist of gas mixing machine, the low concentration gas mixed is as after the source gas of weary wind mixing machine and mine air-lack mixture, enter after weary wind final stage mixing machine mixes, enter weary wind oxidation unit or coal-burning boiler utilization, or during mine return air well main air blower returns wind or two main air blowers switch, namely cannot provide weary landscape condition from weary wind collecting hood, triplet type mixing machine is high by gas pump station, about the air provided by gas mixing machine and air draught machine after low concentration gas mixture becomes low concentration gas is directly mixed to about 1% or 2% concentration, as the gas source of the gas that weary wind oxidation unit or coal-burning boiler utilize,
Wherein, triplet type mixing machine, gas injector, gas mixing machine, weary wind mixing machine are the mixing match of two kinds of gases, its mixture concentration C
1, C
2computing formula is as follows:
C
mixed---mixture after gas gas concentration;
Q1---the first device in Gas flow;
C1---the first mash gas concentration;
Q2---the second device in Gas flow;
C2---the second mash gas concentration;
Mixture unevenness coefficient formulas:
σ---the degree of irregularity of characterizing sample device in Gas;
C
i---the concentration value of i-th sample gas;
---the mean value of statistics sample gas;
N---sample size.
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| CN110043379A (en) * | 2019-05-10 | 2019-07-23 | 重庆潍柴发动机有限公司 | A kind of controller for gas, system, method and controller |
| CN113250735A (en) * | 2021-04-14 | 2021-08-13 | 山东扬德科技有限公司 | Gas safe mixing system and method matched with gas oxidation device |
| CN117046339A (en) * | 2023-10-13 | 2023-11-14 | 山西和运能源服务有限公司 | Intelligent mixing and utilizing device for high-low negative pressure gas of coal mine |
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| CN113250735A (en) * | 2021-04-14 | 2021-08-13 | 山东扬德科技有限公司 | Gas safe mixing system and method matched with gas oxidation device |
| CN117046339A (en) * | 2023-10-13 | 2023-11-14 | 山西和运能源服务有限公司 | Intelligent mixing and utilizing device for high-low negative pressure gas of coal mine |
| CN117046339B (en) * | 2023-10-13 | 2023-12-15 | 山西和运能源服务有限公司 | Intelligent mixing and utilizing device for high-low negative pressure gas of coal mine |
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| CN105498563B (en) | 2018-02-16 |
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