CN105498563B - Coal mine gas mixing system and mixing method - Google Patents
Coal mine gas mixing system and mixing method Download PDFInfo
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- CN105498563B CN105498563B CN201511024687.3A CN201511024687A CN105498563B CN 105498563 B CN105498563 B CN 105498563B CN 201511024687 A CN201511024687 A CN 201511024687A CN 105498563 B CN105498563 B CN 105498563B
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- 238000002156 mixing Methods 0.000 title claims abstract description 155
- 239000003245 coal Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000009423 ventilation Methods 0.000 claims abstract description 19
- 238000009826 distribution Methods 0.000 claims description 29
- 238000002347 injection Methods 0.000 claims description 25
- 239000007924 injection Substances 0.000 claims description 25
- 238000004880 explosion Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 15
- 230000003647 oxidation Effects 0.000 claims description 14
- 238000007254 oxidation reaction Methods 0.000 claims description 14
- 238000013329 compounding Methods 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000013022 venting Methods 0.000 claims description 5
- 238000004320 controlled atmosphere Methods 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000003063 flame retardant Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 239000008246 gaseous mixture Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 250
- 230000008901 benefit Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
Abstract
The invention discloses a coal mine gas mixing system and a coal mine gas mixing method, which belong to the technical field of coal mine safety devices, and comprise a gas pump station, a high-concentration gas power station, a low-concentration gas power station and a coal-fired boiler, wherein the high-concentration gas power station, the low-concentration gas power station and the coal-fired boiler are respectively communicated with the gas pump station through pipelines, a tee-joint mixer is arranged on the pipelines, the tee-joint mixer comprises a high-concentration gas pipe orifice, a low-concentration gas pipe orifice and a mixed gas pipe orifice, and the high-concentration gas pipe orifice, the low-concentration gas pipe orifice and the gas pump station are respectively. The invention forms a plurality of mixing modes through the three-way mixer, the gas ejector, the gas mixer, the ventilation air methane mixer and the ventilation air methane final-stage mixer, effectively utilizes the gas with the concentration lower than 8 percent, and solves the problems of poor safety, low efficiency and uneconomic coal mine gas utilization in China at present.
Description
Technical field
The invention belongs to safety of coal mines engineering device technique field, and in particular to coal mine gas mixing system and compounding method.
Background technology
The high concentration gas power station that colliery is built in advance is left unused with the continuous reduction of mine mash gas extraction concentration, highly concentrated
Degree gas electricity unit can not run generating；Low concentration gas power station is due to mash gas extraction concentration less than 8% beyond low concentration hair
Group of motors lower limit and generating can not be operated；Simultaneously from the ventilation air gas of coal mine ventilation system, most of methane content leads to
Often it is less than 0.3%, can not be also utilized substantially using technology even if using regenerative oxidation, be taken as waste gas and be directly discharged into air, according to
Relevant information counts, and China's coal-mine gas electricity station Homes Using TV is less than 50%；The annual gas emission of China's coal-mine there are about
80%~90% is discharged in a manner of mine ventilation, more there is data to suggest that the methane content being discharged into by idle air in air in 2008
16,100,000,000 m are reached3.Therefore, present gas utilization is less efficient, very uneconomical.Formed while being that clean energy resource can not be effectively sharp
With, can not produce economic benefit and another side is the greenhouse gases effect, the general layout of welding that cause 21 times of carbon dioxide.
Above-mentioned poor, poorly efficient, the uneconomic problem of gas utilization security, many can all be solved by gas mixture
Certainly.
Current gas hybrid technology, in laboratory, small range application, mixing apparatus is single for only several companies, application
Narrow range, and gas mixing arrangement is not designed according to colliery actual production feature, do not formed and adapt to kinds of gas sources bar
The mixed gas system and system compounding method of part, atm number, the industrial applications needs of the wide scope of application can not be met.Therefore, need
The gas compounding method of development system is wanted, forms the gas mixing system of system, realizes efficient, the economical operation of gas utilization.
The content of the invention
In view of this, it is an object of the invention to provide a kind of pressure stability, drag losses is small, mixture effect is good, automatic
, security be present to solve prior art in the high gas mixing system of change degree, and the method using system progress mixture
Poor, poorly efficient, uneconomic problem.
An object of the present invention is achieved through the following technical solutions：
Coal mine gas mixing system and compounding method, including gas pump station and connected respectively with the gas pump station by pipeline
Logical high concentration gas power station, low concentration gas power station and coal-burning boiler, is provided with triplet type mixing machine on pipeline, and described three
Flow-through mixing machine includes the high concentration gas mouth of pipe, the low concentration gas mouth of pipe and mixes the gas mouth of pipe, the high concentration gas mouth of pipe,
The low concentration gas mouth of pipe passes through high concentration gas pipeline, low concentration gas pipeline connection, the mixing watt respectively with gas pump station
This mouth of pipe connects with high concentration gas power station, low concentration gas power station and coal-burning boiler respectively, connects with high concentration gas power station
Gas injector and gas mixing machine are provided with logical pipeline, the gas injector connects with coal bed gas transmission ＆ distribution station, described
The front end of gas mixing machine is connected with the mixing gas mouth of pipe of the triplet type mixing machine, and rear end also connects with the coal-burning boiler
It is logical, be provided with idle air mixing machine and idle air final stage mixing machine on the pipeline connected with stating coal-burning boiler, in addition to it is described weary
The idle air collecting hood of wind mixing machine connection and the ventilation air methane oxidation device being arranged on idle air mixing machine and coal-burning boiler connecting pipeline.
Further, in addition to the gas mixing machine air draught machine connected.
Further, in addition to the high concentration coal seam controlled atmosphere that is arranged on gas injector and coal bed gas transmission ＆ distribution station connecting pipeline
Depressor.
Further, jettron valve, the electricity that can be independently controlled on pipeline to each functional part are arranged in addition to
Control valve and evacuated tube are moved, wet type is provided with the pipeline between the evacuated tube of gas mixing machine front end and gas mixing machine
Regulator.
Further, in addition on the pipeline that is arranged between triplet type mixing machine and gas injector and respectively with high concentration
The light concentration mash gas safety in gas power station, low concentration gas power station and coal-burning boiler connection ensures equipment, the low concentration gas
Safety guarantee equipment includes anti-backflow device, explosion arrestment valve, dry type leaking explosion device, automatic powder spraying explosion suppressor and the water seal being sequentially connected in series
Back-fire relief explosion venting device.
Further, the high concentration gas mouth of pipe of the triplet type mixing machine is set for 30 ° with the low concentration gas mouth of pipe in angle,
Flow distribution plate is set in high-concentration and low-concentration device in Gas intersection, passes through the high concentration gas mouth of pipe and the gas air-flow of the low concentration gas mouth of pipe
Speed is respectively lower than 10m/s.
Further, the gas injector includes injection section, mixing section and diffuser, the high concentration coal seam of the injection section
The angle of gas blowout mouth and the low concentration gas mouth of pipe uses central angle to be set for 90 ° of bend pipes in 30 ° of settings of angle, the mixing section,
The injection pressure 0.3-0.4MPa of the high concentration coal seam gas blowout mouth.
Further, the idle air final stage mixing machine is provided with the V-type flow distribution plate of multilayer stainless steel, every layer of flow distribution plate
Spacing is 20mm.
Further, the wet type regulator include wet type cylinder, level sensor, relief tube, magnetic double level gauge and
Controller, its pressure regulation height of water level maximum are 1000mm.
The second object of the present invention is achieved through the following technical solutions：
The compounding method of coal mine gas is carried out using above-mentioned coal mine gas mixing system：
The high and low concentration gas of gas pump station is compounded into low concentration gas drawing as gas injector by triplet type mixing machine
Emanate body, gas injector is formed elevated pressures transmission ＆ distribution high concentration coal bed gas and low concentration gas injection highly concentrated after injection
Source of the gas of the gas as gas mixing machine is spent, mixture uniformly enters high concentration electric station and generated electricity afterwards, or
The high and low concentration gas of gas pump station is compounded into low concentration gas as low concentration gas power station by triplet type mixing machine
The ejection gas of source of the gas or gas injector, gas injector is elevated pressures transmission ＆ distribution high concentration coal bed gas and low concentration gas
Injection, the low concentration gas formed after injection use for low concentration power station, or
The high and low concentration gas of gas pump station is compounded into low concentration gas as the mixed of gas mixing machine by triplet type mixing machine
Gas is closed, after well mixed low concentration gas is as the source gas and mine air-lack mixture of idle air mixing machine, into idle air end
After level mixing machine is well mixed, utilized into ventilation air methane oxidation device or coal-burning boiler, or mine return air well main air blower return wind or
During the switching of two main air blowers, i.e., in the case of idle air collecting hood can not provide idle air, triplet type mixing machine by gas pump station it is high,
Low concentration gas is compounded into directly mixing to 1% with the air that air draught machine provides by gas mixing machine after low concentration gas
Or 2% concentration, the gas source of the gas utilized as ventilation air methane oxidation device or coal-burning boiler,
Wherein, triplet type mixing machine, gas injector, gas mixing machine, idle air mixing machine are the mixing of two kinds of gas
Proportioning, its mixture concentration C1、C2Calculation formula is as follows：
CIt is mixed--- mixture after gas gas concentration, %；
Q1 --- the first gas throughput, Nm3/min；
C1 --- the first mash gas concentration, %；
Q2 --- second of gas throughput, Nm3/min；
C2 --- second of mash gas concentration, %；
Mixture unevenness coefficient formulas：
σ --- characterize the degree of irregularity of sample device in Gas；
ci--- the concentration value of i-th of sample gas, %；
--- the average value of statistics sample gas concentration, %；
N --- sample size.
The beneficial effects of the present invention are：
1st, the present invention is mixed by triplet type mixing machine, gas injector, gas mixing machine, idle air mixing machine and idle air final stage
The united application of mixed device, can form a variety of mixture modes, take full advantage of the methane gas that concentration is less than 8%, solve at present
Security is poor in China's coal-mine gas utilization, efficiency is low, uneconomic problem.
2nd, the present invention can be such that ventilation air methane oxidation utilizes and coal-burning boiler device using low concentration gas and the compounding method of air
Continuously, stable operation, its efficiency is improved, increases economy.
3rd, gas injector of the invention, injection pressure is smaller, and injection mixture uniformity is good, is using high concentration coal bed gas
After compounding method, the Homes Using TV and generating efficiency in high concentration gas power station can be improved；The generating efficiency in low concentration power station can be improved.
4th, triplet type mixing machine of the invention, drag losses is small, and degree of mixing is good, to gas pumping pump without safety effects.
5th, idle air final stage mixing machine of the invention, collision and flow-disturbing method using V-type flow distribution plate, mixture homogeneity is high,
On ventilation main fan resistance without influence, while there is dehydration, dedusting function.
6th, wet type regulator of the invention has on-line automatic regulation pipeline discharge pressure and automatic safe pressure protection concurrently,
Improve low concentration gas delivery safety, water-sealing fire-retardant explosion venting device, automatic powder spraying explosion suppressor and the automatic explosion arrestment door of setting
Explosive flame can be effectively prevented, low concentration gas is realized and normally conveys.
Other advantages, target and the feature of the present invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.The target and other advantages of the present invention can by following specification realizing and
Obtain.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carried out
Explanation：
Fig. 1 is the 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 idle air final stage mixing machine.
Reference：
1- air draught machines, 2- air flow sensor, 3- air carbon steel pipelines, 4- air evacuated tubes, 5- jettrons
Valve, 6- motor regulated valves, 7- gas mixing machines, 8- triplet type mixing machines, the 81- high concentration gas mouths of pipe, 82- low concentrations watt
This mouth of pipe, the 83- mixing gas mouths of pipe, 84- flow distribution plates；9- low concentration gas flow, concentration, manometer, 10- counterflow-preventings dress
Put, 11- explosion arrestment valves, 12- dry type leaking explosion devices, 13- automatic powder spraying explosion suppressors, 14- water-sealing fire-retardant explosion venting devices, 15- high concentrations
Gas flow, concentration, manometer, 16- high concentrations coal seam controlled atmosphere depressor, 17- jettron valves, 18- gas injectors,
181- injection sections, 182- mixing sections, 183- diffusers, 184- high concentrations coal seam gas blowout mouth, 185- low concentration gas spouts, 19-
Wet type regulator, 20- gas carbon steel pipelines, 21- idle air mixing machines, 22- idle air pressure sensors, 23- idle airs concentration sensing
Device, 24- idle air pipelines, 25- idle air final stage mixing machines, 26- idle air evacuated tubes, 27- idle airs flow, concentration, manometer, 28-
Idle air collecting hood, 29- low concentrations power station evacuated tube, 30- high concentrations power station evacuated tube, 31-V type flow distribution plates, 32- gas pump stations,
33- high concentration gas power station, 34- low concentration gas power station, 35- coal-burning boilers, 36- ventilation air methane oxidation devices, 37- coal bed gas transmission ＆ distribution
Stand.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
1st, coal mine gas mixing system
As shown in figure 1, the coal mine gas mixing system of the present embodiment include gas pump station 32 and respectively with the gas pump
Stand 32 high concentration gas power stations 33, low concentration gas power station 34 and coal-burning boiler 35 by pipeline connection, set on pipeline
There is triplet type mixing machine 8, as shown in Fig. 2 the triplet type mixing machine 8 includes the high concentration gas mouth of pipe 81, low concentration gas pipe
Mouth 82 and the mixing gas mouth of pipe 83, the high concentration gas mouth of pipe 81, the low concentration gas mouth of pipe 82 pass through respectively with gas pump station
High concentration gas pipeline, low concentration gas pipeline connection, high concentration gas flow, dense is provided with high concentration gas pipeline
Degree, manometer 15, the mixing gas mouth of pipe 83 respectively with high concentration gas power station, low concentration gas power station and coal-burning boiler
Connection, is provided with gas injector 18 and gas mixing machine 7, the gas draws on the pipeline connected with high concentration gas power station
Emitter 18 connects with coal bed gas transmission ＆ distribution station 37, the front end of the gas mixing machine 7 and the mixing gas of the triplet type mixing machine 8
The mouth of pipe 83 is connected, and rear end also connects with the coal-burning boiler, and idle air blending is provided with the pipeline connected with stating coal-burning boiler
Device 21 and idle air final stage mixing machine 25, in addition to the idle air collecting hood 28 that is connected with the idle air mixing machine 21 and it is arranged on idle air
Mixing machine 21 and the ventilation air methane oxidation device 36 on coal-burning boiler connecting pipeline, in the idle air pipeline 24 connected with idle air collecting hood 28
On, idle air pressure sensor 22 and idle air concentration sensor 23 are provided with, on the pipeline connected with ventilation air methane oxidation device 36 also
It is provided with idle air flow, concentration, manometer 27.
As the improvement of the present embodiment, the front end of gas mixing machine 21 sets an air draught machine 1, and is provided with an air
Evacuated tube 4.
As the improvement of the present embodiment, in addition to it is arranged on gas injector 18 and coal bed gas transmission ＆ distribution station connecting pipeline
High concentration coal seam controlled atmosphere depressor 16.
As the improvement of the present embodiment, in addition to be arranged on pipeline each functional part can be independently controlled it is pneumatic
Controlled valve, motor regulated valve and evacuated tube, as shown in figure 1, being arranged on the gas between air draught machine and gas mixing machine
Dynamic controlled valve I5, motor regulated valve I 6 and the jettron being arranged between coal bed gas transmission ＆ distribution station and gas injector 18
Valve I 17 etc., be arranged on the evacuated tube I 26 before coal-burning boiler, be arranged on low concentration gas power station before evacuated tube II 29 and
Evacuated tube III 30 before high concentration gas power station, makes each functional part independently to run, and mutually combination and cooperation can transport
OK, and can mutually switches between each.
As the improvement of the present embodiment, in addition to the pipeline being arranged between triplet type mixing machine 8 and gas injector 18
Light concentration mash gas safety guarantee that is upper and being connected respectively with high concentration gas power station, low concentration gas power station and coal-burning boiler is set
It is standby, its anti-backflow device 10 for including being sequentially connected in series, explosion arrestment valve 11, dry type leaking explosion device 12, automatic powder spraying explosion suppressor 13, water seal
Back-fire relief explosion venting device 14.
As the improvement of the present embodiment, the high concentration gas mouth of pipe 81 and the low concentration gas mouth of pipe 82 of triplet type mixing machine 8
In 30 ° of settings of angle, flow distribution plate 84 is set in high-concentration and low-concentration device in Gas intersection, as shown in Fig. 2 passing through the high concentration gas mouth of pipe
It is respectively lower than 10m/s with the gas gas velocity of the low concentration gas mouth of pipe.
As the improvement of the present embodiment, gas injector 18 includes injection section 181, mixing section 182 and diffuser 183, institute
The high concentration coal seam gas blowout mouth 184 of injection section 181 is stated with the angle of low concentration gas spout 185 in 30 ° of settings of angle, such as Fig. 3
Shown, the mixing section 182 uses central angle to be set for 90 ° of bend pipes, the injection pressure of the high concentration coal seam gas blowout mouth 184
0.3-0.4MPa。
As the improvement of the present embodiment, idle air final stage mixing machine 25 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, the not high idle air gas of the degree of mixing of idle air mixing machine 21 is passed through into idle air final stage
Mixing machine 25, collision and flow-disturbing method using V-type flow distribution plate, idle air is divided into multiply idle air gas, then using centrifugation
Idle air gas is mixed into the uniform idle air gas of methane concentration with mechanical head-on collision method；Idle air final stage mixing machine 25 can remove aqueous water
And dust；V-type flow distribution plate selects stainless steel, can antirust improve its service life, spacing is 20mm between flow distribution plate, makes it
With the flowing space that is enough and not wasting, increase its mobility.
As the improvement of the present embodiment, wet type regulator 19 includes wet type cylinder, level sensor, relief tube, magnetic and turned over
Plate liquid level gauge and controller, its pressure regulation height of water level maximum are 1000mm.
2nd, the compounding method of coal mine gas is carried out using above-mentioned coal mine gas mixing system：
Triplet type mixing machine 8, gas injector 18, gas mixing machine 7, idle air mixing machine are set on gas transfer pipeline
21 and idle air final stage mixing machine 25, the aperture of auto-control motor regulated valve 6 control each functional part triplet type mixing machine 8, watt
This injector 18, gas mixing machine 7, the gas density and gas flow of idle air mixing machine 21 and idle air final stage mixing machine 25, make
Device in Gas enters gas power station, ventilation air methane oxidation and coal-burning boiler.
A kind of compounding method includes：The high and low concentration gas of gas pump station is compounded into low concentration gas by triplet type mixing machine 8
As the ejection gas of gas injector 18, gas injector 18 is elevated pressures transmission ＆ distribution high concentration coal bed gas and low concentration gas
Injection, source of the gas of the high concentration gas formed after injection as gas mixing machine 7, mixture uniformly enter high concentration electric station and sent out afterwards
Electricity；Two kinds of compounding methods include：Triplet type mixing machine 8 using the high and low concentration gas of gas pump station be compounded into low concentration gas as
The ejection gas of low concentration gas power station source of the gas or gas injector 18, gas injector 18 is elevated pressures transmission ＆ distribution high concentration
Coal bed gas and low concentration gas injection, the low concentration gas formed after injection is for the use of low concentration power station；Three kinds of compounding method bags
Include：The high and low concentration gas of gas pump station is compounded into low concentration gas as the mixed of gas mixing machine 7 by triplet type mixing machine (8)
Gas is closed, after well mixed low concentration gas is as the source gas and mine air-lack mixture of idle air mixing machine 21, into idle air
After final stage mixing machine 25 is well mixed, utilized into ventilation air methane oxidation device or coal-burning boiler.Wind is returned in mine return air well main air blower
Or during the switching of two main air blowers, i.e., in the case of idle air collecting hood 28 can not provide idle air, triplet type mixing machine 8 is by gas pump
The air that high and low concentration gas of standing is compounded into providing by gas mixing machine 7 and air draught machine 1 after low concentration gas is directly mixed
1% or 2% concentration is bonded to, the gas source of the gas utilized as ventilation air methane oxidation device or coal-burning boiler.
Embodiment 1
Convey low concentration mixing gas total amount 105Nm3/ min, conveying low concentration gas CH4Concentration is 5%, conveys low concentration
Gas scale is 5.25Nm3/ min, air blower conveying air maximum is 140Nm3/ min, CH after the blending of gas mixing machine4It is dense
Degree is less than 2.14%, idle air CH4Concentration is 0.20%, idle air mixing machine idle air flow 1000Nm3/ min, the blending of idle air mixing machine
Concentration uses 0.725% by idle air final stage mixing machine for catalytic oxidizing equipment water heating afterwards.
Embodiment 2
Convey high concentration gas flow 4000Nm3/ h, concentration 32%, conveying low concentration gas flow 2629Nm3/ h, concentration
11.83%, after the blending of triplet type mixing machine, convey low concentration mixing gas total flow 6629Nm3/ h, convey low concentration gas
CH4Concentration is 24%, coal bed gas transmission ＆ distribution station high concentration coal seam throughput 947Nm3/ h, high concentration coal seam gas concentration 96%, gas draws
The maximum flow capacity of emitter is 8000Nm3/ h, injection after gas concentration are 33%, gas mixing machine blending flow 8000Nm3/
H, blending gas density are 33%, generate electricity and use for high concentration gas generating set.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (7)
1. coal mine gas mixing system, it is characterised in that：Connected including gas pump station and respectively with the gas pump station by pipeline
Logical high concentration gas power station, low concentration gas power station and coal-burning boiler, is provided with triplet type mixing machine on pipeline, and described three
Flow-through mixing machine includes the high concentration gas mouth of pipe, the low concentration gas mouth of pipe and mixes the gas mouth of pipe, the high concentration gas mouth of pipe,
The low concentration gas mouth of pipe passes through high concentration gas pipeline, low concentration gas pipeline connection, the mixing watt respectively with gas pump station
This mouth of pipe connects with high concentration gas power station, low concentration gas power station and coal-burning boiler respectively, connects with high concentration gas power station
Gas injector and gas mixing machine are provided with logical pipeline, the gas injector connects with coal bed gas transmission ＆ distribution station, described
The front end of gas mixing machine is connected with the mixing gas mouth of pipe of the triplet type mixing machine, and rear end also connects with the coal-burning boiler
It is logical, be provided with idle air mixing machine and idle air final stage mixing machine on the pipeline connected with stating coal-burning boiler, in addition to it is described weary
The idle air collecting hood of wind mixing machine connection and the ventilation air methane oxidation device being arranged on idle air mixing machine and coal-burning boiler connecting pipeline；
The high concentration gas mouth of pipe of the triplet type mixing machine is set for 30 ° with the low concentration gas mouth of pipe in angle, in high-concentration and low-concentration gas
Gas intersection sets flow distribution plate, is respectively lower than 10m/ by the gas gas velocity of the high concentration gas mouth of pipe and the low concentration gas mouth of pipe
s；The gas injector includes injection section, mixing section and diffuser, the high concentration coal seam gas blowout mouth of the injection section with it is low dense
The angle for spending the gas mouth of pipe uses central angle to be set for 90 ° of bend pipes in 30 ° of settings of angle, the mixing section, the high-concentration coal
The injection pressure 0.3-0.4MPa of layer gas blowout mouth；The idle air final stage mixing machine is provided with the V-type shunting of multilayer stainless steel
Plate, the spacing of every layer of flow distribution plate is 20mm.
2. coal mine gas mixing system according to claim 1, it is characterised in that：Also include connecting with the gas mixing machine
Logical air draught machine.
3. coal mine gas mixing system according to claim 1, it is characterised in that：Also include be arranged on gas injector with
High concentration coal seam controlled atmosphere depressor on the connecting pipeline of coal bed gas transmission ＆ distribution station.
4. coal mine gas mixing system according to claim 1, it is characterised in that：Also include that be arranged on pipeline can be to each
Jettron valve, motor regulated valve and the evacuated tube that functional part is independently controlled, the row in gas mixing machine front end
Wet type regulator is provided with pipeline between blank pipe and gas mixing machine.
5. coal mine gas mixing system according to claim 1, it is characterised in that：Also include being arranged on triplet type mixing machine
Connect respectively on pipeline between gas injector and with high concentration gas power station, low concentration gas power station and coal-burning boiler
Light concentration mash gas safety ensures equipment, and the light concentration mash gas safety ensures that equipment includes anti-backflow device, the resistance being sequentially connected in series
Quick-fried valve, dry type leaking explosion device, automatic powder spraying explosion suppressor and water-sealing fire-retardant explosion venting device.
6. coal mine gas mixing system according to claim 4, it is characterised in that：The wet type regulator includes wet type
Cylinder, level sensor, relief tube, magnetic double level gauge and controller, its pressure regulation height of water level maximum are 1000mm.
7. the compounding method of coal mine gas, its feature are carried out using any described coal mine gas mixing systems of claim 1-6
It is：The high and low concentration gas of gas pump station is compounded into injection of the low concentration gas as gas injector by triplet type mixing machine
Gas, gas injector is elevated pressures transmission ＆ distribution high concentration coal bed gas and low concentration gas injection, the high concentration that is formed after injection
Source of the gas of the gas as gas mixing machine, mixture uniformly enter high concentration electric station and generated electricity afterwards, or
The high and low concentration gas of gas pump station is compounded into low concentration gas as low concentration gas power station source of the gas by triplet type mixing machine
Or the ejection gas of gas injector, gas injector draw elevated pressures transmission ＆ distribution high concentration coal bed gas with low concentration gas
To penetrate, the low concentration gas formed after injection uses for low concentration power station, or
The high and low concentration gas of gas pump station is compounded into gaseous mixture of the low concentration gas as gas mixing machine by triplet type mixing machine
Body, after well mixed low concentration gas is as the source gas and mine air-lack mixture of idle air mixing machine, mixed into idle air final stage
After mixed device is well mixed, utilized into ventilation air methane oxidation device or coal-burning boiler, or wind or two are returned in mine return air well main air blower
During main air blower switches, i.e., in the case of idle air collecting hood can not provide idle air, triplet type mixing machine is high and low dense by gas pump station
Degree gas be compounded into after low concentration gas directly mixing to 1% by gas mixing machine and the air that air draught machine provides or
2% concentration, the gas source of the gas utilized as ventilation air methane oxidation device or coal-burning boiler,
Wherein, triplet type mixing machine, gas injector, gas mixing machine, idle air mixing machine are the mixing match of two kinds of gas,
Its mixture concentration C1、C2Calculation formula is as follows：
CIt is mixed--- mixture after gas gas concentration, %；
Q1 --- the first gas throughput, Nm3/min；
C1 --- the first mash gas concentration, %；
Q2 --- second of gas throughput, Nm3/min；
C2 --- second of mash gas concentration, %；
Mixture unevenness coefficient formulas：
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</msup>
<mo>/</mo>
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<mo>-</mo>
<mn>1</mn>
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<mi>c</mi>
<mo>&OverBar;</mo>
</mover>
</mrow>
</msqrt>
</mrow>
<mrow>
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</mover>
<mo>=</mo>
<mfrac>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
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<mo>=</mo>
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σ --- characterize the degree of irregularity of sample device in Gas；
ci--- the concentration value of i-th of sample gas, %；
--- the average value of statistics sample gas concentration, %；
N --- sample size.
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| CN107435554B (en) * | 2017-07-20 | 2023-06-06 | 山西文龙中美环能科技股份有限公司 | Gas blending system and gas blending concentration control method |
| CN107387155A (en) * | 2017-09-11 | 2017-11-24 | 中煤科工集团重庆研究院有限公司 | Automatic coal bed gas blending control system and regulation and control method |
| CN110043379B (en) * | 2019-05-10 | 2024-08-16 | 重庆潍柴发动机有限公司 | Gas control device, 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 |
| 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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