CN106545876B - Flue gas wellbore method after a kind of gas regenerative oxidation - Google Patents
Flue gas wellbore method after a kind of gas regenerative oxidation Download PDFInfo
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- CN106545876B CN106545876B CN201710024970.9A CN201710024970A CN106545876B CN 106545876 B CN106545876 B CN 106545876B CN 201710024970 A CN201710024970 A CN 201710024970A CN 106545876 B CN106545876 B CN 106545876B
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- gas
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- oxidation
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- flue gas
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
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Abstract
The present invention relates to flue gas wellbore method after a kind of gas regenerative oxidation, mash gas extraction is blended with air, send to gas regenerative oxidation device, oxidation reaction occurs, generate high-temperature flue gas；The heat of generation maintains the heat balance of oxidation unit itself, part of smoke enters gas gas-heat exchanger, heat pit shaft, another part flue gas is sent respectively to gas water heat exchanger or boiler, hot water is generated, the high temperature gases recirculating after exchanging heat by heat exchanger extremely carries out secondary mix with mash gas extraction in mixing machine；The method of the present invention significantly improves system utilization efficiency of heat energy, realizes the reasonable distribution of heat energy utilization after gas oxidation.
Description
Technical field
The invention belongs to heat recovery field, it is related to flue gas wellbore method after a kind of gas regenerative oxidation.
Background technique
The current main application of coal mine light concentration mash gas is gas electricity, but is lower than when gas density fluctuates larger or concentration
When 8%, is mainly destroyed by the way of gas regenerative oxidation and heat energy utilization, have more coal mining enterprises at present and open
The industrial test application of gas regenerative oxidation technology is opened up.Gas regenerative oxidation technology steam after coal master will have oxidation is sent out
Electricity, building heating, the drying purposes such as coal slime and bathing.Also there is the application case using gas regenerative oxidation mode for pit shaft heating
Example, but do not have solution system operational safety hidden danger and guarantee that the method for pit shaft heating effect or system occur.
Coal mine provides thermal medium using coal-fired hot-blast stove or coal-burning boiler in Heating Season mostly for pit shaft heating at present.Such as
Using coal-fired hot-blast stove, then it is to generate high temperature air using coal-fired hot-blast stove, send to well head and mix with cold air to 2 DEG C, and send
To underground, achieve the purpose that heat pit shaft.Such as the coal-burning boiler used, then steam or hot water is generated by boiler, sent to well
Mouth heating room, exchanges heat with air, air themperature is heated to 40 DEG C or more, and mix to 2 DEG C, then again with fresh air
It send to underground.
Coal mine heats the combustion for providing thermal medium, and using using coal-fired hot-blast stove or coal-burning boiler mostly for pit shaft at present
The evaporation capacity of coal stove is seriously polluted generally in 10 tons/h and hereinafter, energy utilization efficiency is low, as haze persistently aggravates, country
The dynamics administered to atmospheric environment is increasing, and boiler of the coal mine for the coal-fired type of various heat supply purposes will gradually be taken
It forms.
The invention uses gas regenerative oxidation technical substitution coal-burning boiler or coal-fired hot-blast stove, generates high temperature air and exists
Heating Season realizes the purpose of heating pit shaft.Although this technology has similar application in coal mine heating pit shaft, there are still change
Blower builds the pressure problem when to Vavle switching, and is difficult to realize accumulation of heat indoor air flow and is evenly distributed with problem, influences regenerative oxidation device operation peace
Entirely, system is caused to be difficult to realize control with easily there is load fluctuation in the heat exchanger cohesive process of rear end during heating pit shaft
And the problem of adjusting.The existing gas regenerative oxidation system utilization efficiency of heat energy applied is lower, and due to northern mine winter
Very cold, gas feed system, gas blending system and instrument and meter executing agency easily freeze, and easily make to system operation
At security risk.
Summary of the invention
In view of this, can be shown the purpose of the present invention is to provide flue gas wellbore method after a kind of gas regenerative oxidation
Raising system utilization efficiency of heat energy is write, realizes the reasonable distribution of heat energy utilization after gas oxidation, and can effectively solve gas conveying
Advantageous item is created in the pipeline icing hidden danger of system, the popularization and application for gas regenerative oxidation using technology in north cold area
Part.
In order to achieve the above objectives, the invention provides the following technical scheme:
Flue gas wellbore method after a kind of gas regenerative oxidation, comprising the following steps:
1) mash gas extraction is blended with air, is sent to gas regenerative oxidation device；
2) mixed gas is preheated in regenerative oxidation device, and oxidation reaction occurs in combustion chamber, generates high temperature
Flue gas；
3) heat generated maintains the heat balance of oxidation unit itself, and part of smoke enters gas gas-heat exchanger, heats
Pit shaft, another part flue gas are sent respectively to gas water heat exchanger or boiler, generate hot water；
4) by the blending section of the high temperature gases recirculating after heat exchanger heat exchange to gas and air, mixed once is carried out,
And carried out in mixing machine with mash gas extraction it is secondary mix, while system pipeline is laid into thermal insulation material.
Further, further include before the step 3) to oxidation after available heat be adjusted between different thermic loads with point
Match.
Further, in step 4), high temperature gases recirculating liquidates with air progress multiple spot and mixes.
Further, the pipeline after high temperature gases recirculating mixes with air increases spoiler, and the spoiler is three piece three
/ mono- circular Circular Plate, interval are arranged at random on the inner wall of mixing duct.
Further, the regenerative oxidation device in step 2) uses 4 cell structures, and the top of regenerative chamber is the area interconnected
The air operated reversing valve in domain, lower part can realize air inlet and the switching of outlet, and an only room is become by air inlet when commutation Vavle switching every time
For outlet.
The beneficial effects of the present invention are: the icing of transportation system pipeline is hidden after solving the blending of coal mine winter gas and blending
Suffer from, improves system heat energy recycling efficiency, and flue gas heat distribution available after gas oxidation is optimized, mention
High system utilization efficiency of heat energy.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Illustrate:
Fig. 1 is the schematic diagram of the method for the present invention；
Fig. 2 is the flow chart of the method for the present invention；
Fig. 3 and Fig. 4 is the structural schematic diagram of the spoiler of the method for the present invention.
Wherein, 1 is mixing machine, and 2 be blower, and 3 be regenerative oxidation device, and 4 be heat exchanger I, and 5 be heat exchanger II, and 6 be cigarette
Chimney, 7 be draw-off pump station, and 8 be water-sealing fire-retardant explosion venting device, and 9 be automatic powder spraying explosion-suppressing device, and 10 be automatic explosive-resisting device, and 11 are
Soft water processor, 12 be feed pump, and 13 be by-passing valve, and 14 be combustion fan.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
As depicted in figs. 1 and 2, mash gas extraction and air are blended in mixing machine 1, by water-sealing fire-retardant explosion venting device
8, automatic powder spraying explosion-suppressing device 9, automatic explosive-resisting device 10 is delivered to gas regenerative oxidation device 3 by blower 2 after mixing, combustion-supporting
For methane oxidized apparatus, fuel during cold start provides combustion air to blower 14, and oxidation reaction occurs, will be except maintenance system
It is by-passing valve that waste heat except system autothermal equilibrium extracts regenerative oxidation device 3,13 out in the form of high-temperature flue gas, is sent to heat exchanger
I4, heat exchanger II5 and boiler exchange heat, and heat exchanger I4 is the gentle heat exchange of gas, and heat exchanger II5 is that gas and water exchange heat, respectively
Generate air inlet mixing hot-air, bathing hot water and the boiled water etc. for meeting pit shaft heating, solve mine shaft heating, bathing and
The thermal load demands such as drinking water, the water after heat exchange are handled through soft water processor 11 and can be recycled, and 12 be feed pump.
As shown in Fig. 2, gas regenerative oxidation device 3 is the structure of 4 regenerative chambers, every time only one when commutation Vavle switching
Room becomes outlet from air inlet, and will not generate airless inflow regenerative chamber causes blower to build the pressure, and single regenerative chamber relative cross-sectional
Product is smaller, and air flow method is more uniform, and oxidation effectiveness is more preferably.It is the region interconnected in the upper design of regenerative chamber, referred to as
Combustion chamber, the key reaction area after being preheated for gas.Gas reacts in oxidation unit discharges heat, maintains system heat
Amount balance, extra heat is by the air hatch at top, and quantity of heat given up produces heat to boiler or heat exchanger in the form of high-temperature flue gas
Matchmaker carries out heat supply or the energy utilization of other approach.The air operated reversing valve of regenerative oxidation device lower part can realize air inlet and outlet
Switching, realize each regenerative chamber of oxidation unit between heat transfer and equilibrium process.
The present embodiment is exported to the pneumatic tune at heat user end including oxidation unit by the way that heat regulation distribution system is arranged
Valve, pneumatic shut-off valve, flowmeter and monitoring system are saved, flue gas flow can be carried out according to weather condition, load fluctuation situation
It rationally adjusts and distributes, and then better meet every thermal load demands, using flue gas after the heat exchange that should drain into chimney 6, return
It is flow to the inlet end of air, is mixed in such a way that multiple spot liquidates, air is heated to vapor dew-point temperature or more (one
As can be heated to 20 DEG C or higher temperature), then blended in mixing machine 1 with mash gas extraction again, improve blending procedure
And system pipeline is laid thermal insulating material and by the way that reasonable pipe insulation measure is arranged by the temperature of transmission process gas after mixing
Material avoids generating icing hidden danger in gas mixing and transmission process.
As shown in Figure 3 and Figure 4, by backflow flue gas, pipeline increases spoiler upon mixing in the present embodiment, increases mixed
Effect is closed, to guarantee the uniformity of mixed gas effect.The shape of spoiler is by a steel plate identical with air pipeline cross section
3 parts are split as by sectorial area, each piece of spoiler is the Circular Plate of three pieces of one third annular shapes, and interval is arranged at random
On the inner wall of mixing duct, Fig. 4 is the view of Fig. 3 in axial direction, and 3 pieces of fan-shaped steel plates are radially just surrounding 360 °.
The invention realizes " distribution according to need " of heat and the cascade utilization of high-temperature flue gas heat after gas oxidation, mentions
Utilization efficiency of heat energy has been supplied, and has solved the icing of transmission process after system is blended and mixed when northern coal mine Heating Period is applied
Hidden danger, technological innovation is stronger, and has preferable practical value.
The present embodiment is the coal mine in a north, and plan substitutes coal-burning boiler using gas regenerative oxidation technique, realizes pit shaft
The function of heating, and the heat source of constructure heating heat source and boiler is provided for ventilating shaft duty room.The most cold moon in the ground winter
Mean minimum temperature is -19 DEG C, and pit shaft intake volume is 10000Nm3/ h, through calculating, equipment thermal load demands are
4962kW, while the constructure heating load of ventilating shaft duty room is 600kW, the thermic load of boiler is 400kW, and load adds up to
5962kW.Design a set of 100000Nm3The gas regenerative oxidation device and mating waste heat steam boiler of/h, through measuring and calculating when gas stores
When thermal oxidation apparatus concentration for the treatment of is 1.2%, quantity of heat given up 9095kW considers then may be used along journey conveyance loss and heat exchange efficiency
Output heat from heat source is 6063kW, can meet the thermal load demands of existing heating pit shaft, heating and boiler.Process flow is such as
Shown in Fig. 2.Lead to the flow tune of each heat distribution pipelines such as well head heating heat exchanger, heating heat exchanger and boiler using steam
Valve is saved, is adjusted by respectively different thermal load demands, so that the heat that waste heat boiler generates after oxidation unit is closed
Reason, effective distribution.When meteorological condition variation, inlet air temperature is increased to -10 DEG C, and equipment load is down to 2835kW, this
When equipment, heating and boiled water load add up to 3835kW, processing methane concentration can be reduced to 0.8%, after oxidation unit
The maximum exportable heat of waste heat boiler is 4042kW, can meet all thermal load demands and (have contemplated that along journey conveyance loss and heat exchange
Efficiency).Similarly, when inlet air temperature continues to increase, and is such as increased to -4 DEG C, processing methane concentration can be reduced to 0.5, oxidation dress
The end exportable heat 2526kW of waste heat boiler (having contemplated that along journey conveyance loss and heat exchange efficiency) is postponed, the total of 2418kW can be met
Thermal load demands.
Meanwhile about 150 DEG C of flue-gas temperature exported from waste heat boiler 9, chimney 6 should be drained into, it, will in this process system
It partly or entirely (carries out the adjusting of flow, extra flue gas partial drains into chimney 6) for heating extraction watt according to actual needs
The cold air air inlet of this blending section, makes its temperature be higher than the vapor dew-point temperature under local meteorological condition, avoids blending and defeated
The generation of journey icing phenomenon is passed through, the appearance of interruption of service is avoided.The coal extraction gas density is about 8%, uses mash gas extraction
Combined amount is 12000Nm3/ h, when environment temperature is -19 DEG C, when target mixture temperature is 21 DEG C, the air that needs to blend
And the flue gas flow of reflux is respectively 67000Nm3/ h and 21000Nm3/h；When environment temperature be -15 DEG C when, the air of blending and
The flue gas flow of reflux is respectively 69000Nm3/ h and 19000Nm3/h；When environment temperature be -10 DEG C when, the air of blending and return
Flowing exhaust gas volumn is respectively 71000Nm3/ h and 17000Nm3/ h (it is assumed that when variation of ambient temperature, backflow flue gas temperature is invariable,
It is 150 DEG C).Through calculating, heat boiler outlet flue gas flow is about 24000Nm3/ h, then in addition to backflow flue gas, redundance
Flue gas be then immediately discharged to chimney 6.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand 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 (2)
1. flue gas wellbore method after a kind of gas regenerative oxidation, it is characterised in that: the following steps are included:
1) mash gas extraction is blended with air, is sent to gas regenerative oxidation device；
2) mixed gas is preheated in regenerative oxidation device, and oxidation reaction occurs in combustion chamber, generates high-temperature flue gas,
Wherein regenerative oxidation device uses 4 cell structures, and the top of regenerative chamber is the region interconnected, and the air operated reversing valve of lower part can be real
The switching of existing air inlet and outlet, commutate every time Vavle switching when an only room outlet become from air inlet；
3) heat generated maintains the heat balance of oxidation unit itself, and part of smoke enters gas gas-heat exchanger, heated well
Cylinder, another part flue gas are sent respectively to gas water heat exchanger or boiler, generate hot water；
4) blending section of the high temperature gases recirculating to gas and air after exchanging heat by heat exchanger, progress mixed once, and with
Mash gas extraction carries out secondary mixing in mixing machine, while system pipeline is laid thermal insulation material, wherein high temperature gases recirculating with
Air carries out multiple spot and liquidates mixing, the pipeline increase spoiler after high temperature gases recirculating mixes with air, and the spoiler is
The Circular Plate of three pieces of one third annular shapes, interval are arranged at random on the inner wall of mixing duct.
2. flue gas wellbore method after gas regenerative oxidation according to claim 1, it is characterised in that: further include in step
It is rapid 3) before available heat after oxidation is adjusted and is distributed between different thermic loads.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108488893A (en) * | 2018-03-06 | 2018-09-04 | 河北煜剑节能技术有限公司 | Low concentration gas heat source prizes heating plant |
| CN108514810A (en) * | 2018-06-19 | 2018-09-11 | 山西文龙中美环能科技股份有限公司 | A kind of gas oxidative system |
| CN110145867B (en) * | 2019-05-28 | 2020-04-14 | 浙江亿扬能源科技有限公司 | Coal mine shaft step heating system based on low-concentration gas oxidation and operation method |
| CN110985202A (en) * | 2019-11-24 | 2020-04-10 | 中煤科工集团重庆研究院有限公司 | Cold, heat and electricity triple supply system based on low-concentration gas |
| CN111121067A (en) * | 2019-11-24 | 2020-05-08 | 中煤科工集团重庆研究院有限公司 | Method for utilizing low-concentration gas |
| CN113217979A (en) * | 2021-05-08 | 2021-08-06 | 中煤科工集团重庆研究院有限公司 | Multi-state coupling peak regulation intelligent control system for gas heat accumulation oxidation, electric auxiliary heat and molten salt heat accumulation |
| CN113175686B (en) * | 2021-05-08 | 2022-12-27 | 中煤科工集团重庆研究院有限公司 | Preheating method of molten salt heat storage system based on gas heat storage oxidation |
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| CN204704825U (en) * | 2015-05-12 | 2015-10-14 | 北京矿大节能科技有限公司 | A kind of extremely low concentration coal mine gas boiler |
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