CN101135441B - Mine ventilation mash gas burning and heat energy using device - Google Patents
Mine ventilation mash gas burning and heat energy using device Download PDFInfo
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- CN101135441B CN101135441B CN200710131844XA CN200710131844A CN101135441B CN 101135441 B CN101135441 B CN 101135441B CN 200710131844X A CN200710131844X A CN 200710131844XA CN 200710131844 A CN200710131844 A CN 200710131844A CN 101135441 B CN101135441 B CN 101135441B
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Abstract
This invention belongs to the thermal energy utilization device of the mine ventilation gas and includes the counter current circular channel, the centrally positioned porous material and high temperature resistant heat pipe. The mine ventilation gas is conducted circlewise to the bottom of the combustion center, rectified by the gas distribution board, and combusted axially inside the porous medium. The flume is marshaled above and conducted to the circular channel for heat exchange with the mine ventilation gas. Through parallel installation of the combustion units, the real time control ofthe operational number of combustor based on the mine ventilation gas flux, the control of steam flux and electrical heating components in the high temperature heat pipe based on the temperature of the combusting area, this invention meets the requirement of mine ventilation gas processing on the flux and concentration, and ensures the stable operation of the devices.
Description
Technical field:
The invention belongs to the combustion apparatus technical field, particularly the burning of mine ventilation gas and heat energy utilization device.
Background technology:
Coal bed gas is a kind of in coal containing formation, and the coal-forming material of planting organic matter matter based on corruption is spontaneous in the coal-forming process, store up the unconventional natural gas of formula certainly, is commonly called as gas, and main component is a methane, accounts for more than 90%.Coal bed gas is counted as the pernicious gas that coal mining is caused serious security threat all the time, in the coal mining history, because mine ventilation gas has caused the outstanding accident of a lot of gas, dust explosion accident and coal and gas.And methane is as the main component of mine ventilation gas, caloric value under its normal temperature is 3.43～3.71MJ/Nm3, its calorific value and natural gas are suitable, it is a kind of efficient, clean unconventional natural gas, can be used as domestic fuel, also can be used for generating and motor vehicle fuel, have very high economic worth.If methane directly is discharged in the atmosphere, caused the serious waste of limited non-renewable resources on the one hand; On the other hand, the main component methane of mine ventilation gas is the gas with strong greenhouse effects, its greenhouse effects are bigger 20 times than carbon dioxide, be dispersed into the methane contaminated environment in the atmosphere, cause unusual weather conditions, simultaneously the methane in the atmosphere consumes the ozone in the stratosphere, and ozone reduces to make and shines tellurian ultraviolet ray and increase, form smog, also can bring out some disease, harm humans health.According to relevant, the total amount that the whole world enters methane in the atmosphere every year is 4.1～6.6 hundred million tons, be mainly derived from coal mining, garbage loading embeading, oil and natural gas industry, animal wastes and remains etc., great majority are to discharge under methane concentration is lower than 1% situation, have caused the serious wasting of resources and atmosphere pollution.Therefore study a kind of mine ventilation (low concentration) gas combustion and the heat energy utilization device has great importance.
At present with low concentration gas as main fuel, the combustion technology that adopts mainly contains two classes: a class is that the hot-fluid that U.S. Sequa company and Sweden ADTEC (now being merged by MEGTEC) develop changes reactor technology (ThermalFlow-Reversal Reactor is TFRR), and another kind of is the catalysis circulation reactor technology (Catalytic Flow-Reversal Reactor is CFRR) of Canadian energy variation laboratory and NRcan development.The basic principle of TFRR is identical with high-temperature air burning (High Temperature Air Combustion is HTAC), back and forth change flow circuits by the reversal valve device, reach the purpose of cycle heat exchange, difference is that the porous media storage heater of HTAC only plays periodically heat exchange effect between air and combustion gas, and burning occurs in the free space; And burning among the TFRR and heat exchange all directly occur in the porous media.This equipment can be handled 0.35% gas density, is limited to 0.15% down and it further declares in the report independently to burn.CFRR has the similar substantially structure and the method for operation to TFRR, and difference is to have added one deck catalyst layer between heat exchanger and heat exchange medium, the gas autoignition temperature is reduced and distinguished and admirablely turns to the cycle growth.So both problems of all existing are the regular airflow-reversings of needs; And for fear of a large amount of heat radiations, keep flameholding and carry out, around the reactor good heat insulation layer need be arranged, cause device structure and complicated operation.
The seminar at the author place has designed a kind of novel annular burner (Chinese patent: CN201021800,2008.02.13), can solve the problem that above-mentioned two kinds of device CFRR and TFRR exist, yet the author is further finding that the combustion centre district of this annular burner---porous media is difficult to the location in the research; Dividing plate need be made of exotic material, complex structure, and manufacturing cost increases; Because the existence of dividing plate, the shape of porous media there is special requirement, increased the difficulty of processing; And mine ventilation gas is shorter in the combustion path of this structure, and burning is difficult for being stabilized in porous media inside, causes temperature runaway (high-temperature region drifts to the circular passage from porous media, and it is outer to go out burner by the circular passage drift again) out of control or flame-out phenomenon take place.For this reason, the structure of annular burner is improved and optimizated, and burner is carried out Combination Design, adopt burner unit structure in parallel, avoided the end heat waste, improved efficiency of combustion and its stability; Can start the number of burner according to the flow-control of mine ventilation gas, solved because the unmanageable difficult problem that the mine ventilation gas instability of flow causes, improved the accommodation of burner, can be fit to the to burn gaseous hydrocarbon and the heat energy utilization thereof of low concentration solve present energy waste and problem of environmental pollution.
Summary of the invention:
A kind of mine ventilation mash gas burning of the present invention and heat energy utilization device are composed in parallel by a plurality of burner unit; Single burner comprises air inlet and gas outlet, and air inlet is connected in parallel on the mine ventilation gas trunk line, and the gas outlet is connected in parallel on the flue gas trunk line, and the solenoid control switch all is housed; The built-in porous material in burner center, electrical heating elements is inserted in the porous material; Feed high-temperature steam in the high-temperature resistant tube of heat energy utilization; It is characterized in that: surround ring-type inlet channel and exhaust passage by lamellar wall one and wall two, form the gas channel of bidirectional adverse current, be communicated with that the mine ventilation gas that is positioned at the center converges the chamber and flue gas converges the chamber; Two converge and are built-in with porous material between the chamber, the combustion gas uniform board.
Mine ventilation gas enters the circular passage by air inlet, with the high-temperature flue gas generation countercurrent flow in another annular flow path, be preheated to uniform temperature, enter porous material one side at annular channel circle center, after the rectification of airflow uniform distribution plate, burn in porous media with the axial flow direction, the high-temperature flue gas that burning produces converges at the opposite side of porous material, is discharged by the gas outlet that is installed on the loop configuration after circular passage and mine ventilation gas heat exchange.High temperature resistant heat pipe is placed in flue gas time internal layer passage, feeds steam and flue gas and carries out exchange heat, produces superheated steam, uses for generating or it; Also but bubbling air is taken away unnecessary heat in order to utilizing.Porous material is preheated to the ignition temperature of mine ventilation gas by electrical heating elements.With stay bolt together, judge according to the flow of mine ventilation gas and the use number of burner start built-in electrical heating elements and air inlet, the valve of giving vent to anger of burner a plurality of combustor parallels.
Because the present invention has taked the round gas channel of bidirectional adverse current, the round that heat is transmitted in bidirectional adverse current is imported and exported between the gas channel wall and is realized, and the ring-type heat exchanger of outer end has been realized radially insulation to the combustion zone at center, the end face heat waste has been avoided in the parallel connection of burner simultaneously, and preheating mutually, therefore when airflow channels was abundant, this device combustion centre district can reach higher operating temperature, thereby can further reduce the concentration limit of burning; Because the heat exchange of gas is carried out in reverse circular heat exchanger among the present invention, the high-temperature region is in the center of burner all the time, does not therefore need regularly to carry out airflow-reversing to keep burning, has simplified equipment and operation, has reduced cost; Because the round airflow channel structure of the bidirectional adverse current that the present invention takes and the parallel-connection structure of burner reduce the heat waste face of device, have increased the stability and the requirement that has reduced outside adiabatic heat-insulation of burning.Because structure Design optimization to burner, make that the airflow direction in central reaction district is axially, promptly increased the path of combustion reaction, improved combustion stability and fully the degree, simplified the structure of porous material again, can adopt existing on the market porous material (as the foamed ceramics sheet of circle), need not special processing and fabricating, reduced manufacturing cost.Burner is carried out parallel connection,, the disposal ability of equipment, flow adaptability are strengthened according to the number that the flow-control burner of mine ventilation gas is opened.
In a word, because a kind of mine ventilation mash gas burning of the present invention and heat energy utilization device have been taked the round gas channel and the combustor parallel operation of bidirectional adverse current, radial and axial good heat insulation, central reaction district path length, the burner center can reach higher operating temperature, can further reduce the concentration limit of burning, need not regular airflow-reversing and catalyst simultaneously, radiating surface requires low less to insulation, simplified equipment, reduced cost, and disposal ability is strong, flow adaptability is strong.Burner of the present invention is applicable to comprising the oil reservoir gas in mine ventilation gas gas, natural gas, the oil exploitation or the low concentration gaseous hydrocarbon of the combustible exhaust gas in the Chemical Manufacture.
Description of drawings:
Fig. 1 is the exemplary construction schematic diagram of a kind of mine ventilation mash gas burning of the present invention and heat energy utilization device.
Fig. 2 is the vertical view of combustion gas uniform board.
The structural representation of Fig. 3 burner unit.
The vertical view of Fig. 4 burner unit structure
The specific embodiment:
Further specify the specific embodiment of a kind of mine ventilation mash gas burning of the present invention and heat energy utilization device below in conjunction with accompanying drawing.
Fig. 1 has provided the exemplary construction schematic diagram for mine ventilation mash gas burning of the present invention and heat energy utilization device.Single burner has four holes on dull and stereotyped 1, penetrated in the hole by bar 5, and the end is fixing with bolt 8, and a plurality of annular burner parallel connections are assembled into this device.The maximum stream flow decision of the mine ventilation gas of the number of combustor parallel during by concrete use.The air inlet 13 of burner and gas outlet 2 are connected in parallel respectively on mine ventilation gas trunk line and the fume emission pipeline, and magnetic valve is installed, and according to the real-time traffic of mine ventilation gas the number that burner uses are controlled.The annular burner unit is inlet channel 15 and the exhaust passage 3 that is surrounded multi-ring annular by lamellar wall 1 and wall 2 14, forms the gas channel of bidirectional adverse current.Behind the flue gas heat exchange of mine ventilation gas in inlet channel 15 and exhaust passage 3, enter mine ventilation gas and converge chamber 10, burn by evenly feeding in the porous material after 11 rectifications of combustion gas uniform board, the vertical view of combustion gas uniform board 11 as shown in Figure 2.Gas fume after burning is converged chamber 6 at flue gas and is converged the back and flow into exhaust passage 3, after mine ventilation gas heat exchange in the inlet channel 15, discharges via gas outlet 2 to flue gas trunk line.The heat exchange area that the number of turns of gas channel can be kept the needed preheat temperature decision of burning certainly according to mine ventilation gas calculates.
In the present embodiment, wall 2 14 innermost layer thin plate two ends are all than the short certain distance (this distance is 10mm at least) of outer sheet metal, the formation flue gas converges chamber 6 and mine ventilation gas converges chamber 10, and by the passage relative closure of combustion gas uniform board 11 realizations, and the even distribution of mine ventilation gas in porous material 7 to mine ventilation gas and flue gas.This structure Design make mine ventilation gas and flue gas the flow direction as shown in Figure 3 and Figure 4.Among Fig. 3, * expression mine ventilation gas inwardly flows into inlet channel 15 perpendicular to paper, and the expression mine ventilation gas outwards flows into annular flow path perpendicular to paper;
The expression flue gas outwards flows into exhaust passage 3 perpendicular to paper; ⊙ represents that flue gas outwards flows into annular flow path perpendicular to paper.Solid arrow is represented the flow direction of mine ventilation gas in annular flow path among Fig. 4, and dotted arrow is represented the flow direction of flue gas in annular flow path.This structure decrease this research department former patent (Chinese patent: CN201021800,2008.02.13) dividing plate that in porous material, is provided with, and prolonged combustion reaction path and the holdup time of mine ventilation gas in porous material 7, make that the easier burning of mine ventilation gas is complete, increased the flameholding zone.And it is cylindrical that this structure is reduced to the shape need of porous material, is easy to make, and can stack the combustion zone at formation center with existing floamed ceramics filtrating piece on the market.Floamed ceramics filtrating piece material selection zirconia, carborundum, aluminium oxide.
At porous material 7 in-built electrical heating element heaters 16, lead-in wire is drawn from dull and stereotyped 1 hole that has, groove, guarantees that each burner flat board when parallel connection can closely stick together, and conducts heat mutually, and lead-in wire is outer simultaneously should exotic material protected, and connects power supply.And temperature thermocouple is set at porous material 7.Inferior internal layer at the annular flow path of flue gas is installed high-temperature resistant tube 9, feeds steam in the high-temperature resistant tube 9, and the heat energy that utilizes mine ventilation mash gas burning to discharge produces superheated steam, is used for generating.
During use, start electrical heating elements 16 earlier, porous material 7 is preheated to 1200 ℃, record by temperature thermocouple.Start air intake valve then, mine ventilation gas enters mine ventilation gas by air inlet 13 through inlet channel 15 and converges chamber 10, after 11 rectifications of combustion gas uniform board, enter porous material 7, carry out heat exchange with the porous material 7 of preheating and to the required temperature of combustion reaction, oxidation reaction takes place, emit heat.When treating the temperature stabilization in the porous material 7, close electrical heating elements 16.The high-temperature gas passes flue gas converges chamber 6 and enters exhaust passage 3, with the mine ventilation gas heat exchange in the inlet channel 15; After device entered normal operating conditions, mine ventilation gas was by carrying out preheating with the heat exchange of high-temperature flue gas, and carried out from keeping smooth combustion under the booster action of porous material 7 storages and transmission heat.Because the concentration that the gas in the coalmine ventilation gas is gushed out has certain fluctuation, the mine ventilation gas that the variable concentrations scope can be set is kept the needed temperature stabilization scope of burning certainly in the combustion chamber, by the gas density table and the temperature thermocouple that are installed on the trunk line this temperature is transferred to control module, control the open and close of electrical heating elements 16 according to the flameholding operating temperature range of burner setting, and feed quantity of steam in the high-temperature resistant tube 9, guarantee that burner is not flame-out, not overheated.On the trunk line of mine ventilation gas, flow detector is set, detects the flow of mine ventilation gas in real time, judge the unlatching number of burner again according to the load of single burner.The distance of flow detector and burner should be preheated to the product of 1200 ℃ of 16 start-up times of electrical heating elements and mine ventilation gas flow velocity greater than burner, and promptly mine ventilation gas enters the burner that is started smooth combustion can take place.
Claims (5)
1. mine ventilation mash gas burning and heat energy utilization device are composed in parallel by a plurality of burner unit; Single burner comprises air inlet (13) and gas outlet (2), and air inlet (13) is connected in parallel on the mine ventilation gas trunk line, and gas outlet (2) are connected in parallel on the flue gas trunk line, and the solenoid control switch all is housed; The built-in porous material in burner center (7), electrical heating elements (16) are inserted in the porous material (7); Feed high-temperature steam in the high-temperature resistant tube of heat energy utilization (9); It is characterized in that: surround ring-type inlet channel (15) and exhaust passage (3) by lamellar wall one (4) and wall two (14), form the gas channel of bidirectional adverse current, be communicated with that the mine ventilation gas that is positioned at the center converges chamber (10) and flue gas converges chamber (6); Two converge and are built-in with porous material (7) between the chamber, combustion gas uniform board (11).
2. a kind of mine ventilation mash gas burning as claimed in claim 1 and heat energy utilization device are characterised in that a plurality of burners are installed in parallel, the number of opening according to the flow-control burner of mine ventilation gas; The flow of the interior steam of temperature control high-temperature resistant tube (9) of the porous material (7) that records according to temperature thermocouple and the switching of electrical heating elements (16).
3. a kind of mine ventilation mash gas burning as claimed in claim 1 and heat energy utilization device are characterised in that inlet channel (15) and exhaust passage (3) adopt the multi-turn gas channel of helical form, circular or square ring-type.
4. a kind of mine ventilation mash gas burning as claimed in claim 1 and heat energy utilization device are characterised in that the innermost layer thin plate two ends of wall two (14) all are as short as few 10mm than outer sheet metal, and the formation flue gas converges chamber (6) and mine ventilation gas converges chamber (10).
5. a kind of mine ventilation mash gas burning as claimed in claim 1 and heat energy utilization device are characterised in that the burner center is equipped with porous material (7); Porous material (7) stacks composition with floamed ceramics filtrating piece, the material selection zirconia of floamed ceramics filtrating piece, carborundum, aluminium oxide; Porous material (7) in-built electrical heating element heater (16).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710131844XA CN101135441B (en) | 2007-09-06 | 2007-09-06 | Mine ventilation mash gas burning and heat energy using device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710131844XA CN101135441B (en) | 2007-09-06 | 2007-09-06 | Mine ventilation mash gas burning and heat energy using device |
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| CN101135441A CN101135441A (en) | 2008-03-05 |
| CN101135441B true CN101135441B (en) | 2010-12-01 |
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| CN200710131844XA Expired - Fee Related CN101135441B (en) | 2007-09-06 | 2007-09-06 | Mine ventilation mash gas burning and heat energy using device |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102767404A (en) * | 2011-05-06 | 2012-11-07 | 中国科学院工程热物理研究所 | System and method of gas turbine for utilizing low-concentration gas |
| CN103278599A (en) * | 2013-03-25 | 2013-09-04 | 广东电网公司电力科学研究院 | Low-density gas burner, burning test system and controlling method thereof |
| CN104456505A (en) * | 2014-12-02 | 2015-03-25 | 中国矿业大学 | Low-concentration coal-bed methane or methane gas steam boiler |
| CN105605574A (en) * | 2016-03-22 | 2016-05-25 | 湖南科技大学 | Telescopic ultralow-heat-value coalbed methane combustion device |
| CN109297036B (en) * | 2018-09-29 | 2023-09-12 | 中国矿业大学 | Self-adaptive oxidation device for unidirectional flowing concentration of coal mine gas |
| CN113404475B (en) * | 2021-07-15 | 2022-03-04 | 吉林大学 | Underground combustion heater for in-situ heating of underground mineral resources |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201149252Y (en) * | 2007-09-06 | 2008-11-12 | 中国科学技术大学 | Mine ventilation mash gas combustion and heat energy utilizing apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201149252Y (en) * | 2007-09-06 | 2008-11-12 | 中国科学技术大学 | Mine ventilation mash gas combustion and heat energy utilizing apparatus |
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