CN102720527A - Multi-bed type ventilation air methane regenerative thermal oxidation device - Google Patents
Multi-bed type ventilation air methane regenerative thermal oxidation device Download PDFInfo
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- CN102720527A CN102720527A CN2012102178438A CN201210217843A CN102720527A CN 102720527 A CN102720527 A CN 102720527A CN 2012102178438 A CN2012102178438 A CN 2012102178438A CN 201210217843 A CN201210217843 A CN 201210217843A CN 102720527 A CN102720527 A CN 102720527A
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Abstract
The invention discloses a multi-bed type ventilation air methane regenerative thermal oxidation device which is used in a ventilation air methane counter-flow thermal oxidation treatment process during production of coal mines. The device comprise three or more oxidation beds, a combustion chamber, a preheater, a ventilation air inlet pipe, a flue gas outlet pipe, a purging pipeline, a flue gas extraction pipeline, a switching valve and a control unit. Oxidation beds are in a vertical structure, heat-insulating fire-resisting materials are arranged on peripheries of oxidation beds, and in addition to a heat accumulation and heat release circulation, a purging purification process is added, so that unoxidized ventilation air is prevented from being directly exhausted into the air, and the oxidation rate exceeds 99%. Besides, flue gas extraction openings are arranged between high-temperature zones and low-temperature zones of oxidation beds, so that part of high-temperature flue gases can be extracted for waste-heat utilization. The device has the advantages of being high in oxidation rate of methane, convenient for waste-heat utilization, stable to operate and the like.
Description
Technical field
The present invention relates to a kind of multibed type ventilation air gas regenerative oxidation device that is applied in the ventilation air gas refluent heat oxidation processing technique.
Background technology
Coal mine to ventilate mash gas is claimed ventilation air gas again, because its methane content is low and lack and effectively to utilize mode and directly enter in the atmosphere.The annual gas emission of China's coal-mine has 80%～90% approximately, discharges with the mine ventilation mode.According to the interrelated data statistics, the methane content that entered in the atmosphere through weary wind in 2008 has reached 16,100,000,000 m3.Other there are some researches show that the methane greenhouse effect are about 21 times of carbon dioxide, and are extremely strong to environmental destruction property.Therefore, recycling ventilation air gas has energy-conservation and the environmental protection double meaning.
The methane volume fraction is very low in the weary wind, can't directly be lighted or keep burning, and this is the difficult point of development and use ventilation air gas.Along with people's is paid close attention to all the more the processing and the energy recovery and utilization technology of ventilation air gas the attention of the energy and environmental problem both at home and abroad.The oxidation utilization of ventilation air gas at present adopts hot counter flow oxidation technological, and its operating principle is: by the assistant heating means oxidation bed core is heated to high temperature when device starts, forms the thermal field that central temperature is high, the both sides temperature is low; Ventilation air gas initially passes through honeycomb ceramic heat accumulator from a direction, and absorption heat temperature raises and oxidation rapidly gradually in flow process, and the high-temperature flue gas after the oxidation continues to flow and follow-up heat storage is heated, and reactor is discharged in flue gas self temperature reduction back; Through behind the some cycles, airflow-reversing so moves in circles, system's continuous service.
Have only the research of minority unit at the oxidation technology that carries out coal mine wind-lack gas at present, the single box regenerative thermal oxidizer of the Vocsidizer of similar U.S. MEGTEC company has all been adopted in patent documentation disclosed " mine air-lack mash gas thermal oxidation apparatus " (200810249860.3), " coal mine methane oxidation unit " (201010216013.4), " the mine ventilation counter flow oxidation device with flue gas aspirator " (201010166371.9), " coal mine wind-lack gas thermal oxidation device of the heat-obtaining of bleeding " (201010274138.2).There are some shortcomings in this structure: at first; When switching gas flow direction; The original regenerator that gets into weary wind becomes the regenerator of discharging purified gas immediately, and the gas not oxidised between transfer valve and reaction compartment is reacted and directly discharged with purified gas like this; Secondly, inlet valve and outlet valve be in utmost point startup simultaneously in the short time, might make the ventilation air gas of entering directly walk short circuit and discharge with purified gas.For these reasons, the instantaneous underproof peak value of the purified gas that just might occur discharging has reduced the average oxygenation efficiency of installing.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of multibed type ventilation air gas regenerative oxidation device.This device has increased by one and has purged purification process in accumulation of heat and heat release circulation; The oxidation unit of traditional structure is remained in the not oxidised reaction ventilation air gas purging oxidation to the combustion chamber between transfer valve and the reaction compartment in the moment of commutating; Thereby prevent that the weary wind of not oxidation directly is discharged in the atmosphere, oxygenation efficiency is up to more than 99%.Between oxidation bed high-temperature region and low-temperature space, be provided with fume gas extraction port, can extract the part high-temperature flue gas and carry out UTILIZATION OF VESIDUAL HEAT IN.
The objective of the invention is to realize through following technical scheme:
This kind multibed type ventilation air gas regenerative oxidation device; Device comprises n oxidation bed, and said n is the integer more than or equal to 3, and said n oxidation bed adopts mode side by side vertical and that top is communicated with to combine; Form the device body of a vertical structure; The combustion chamber is formed jointly at the top that all oxidation beds are connected together, and the bottom of each oxidation bed is provided with the support aperture plate, and propping bar is provided with certain thickness ceramic rectangular saddle ring on the net; The top of pottery rectangular saddle ring is stacked with honeycomb ceramic heat accumulator; Said honeycomb ceramic heat accumulator is divided into high-temperature region and low-temperature space according to upper and lower relation, leaves the gap between two-layer, and the outer setting of device body is useful on the thermal insulation fire-resistant material that surrounds device body;
Said device also comprises weary wind air inlet pipeline, fume extraction pipeline, flue gas outlet pipe, scavenging pipeline, fuel conduit and combustion air pipeline; Be connected with n air inlet transfer valve on the said weary wind air inlet pipeline, each air inlet transfer valve is all according to concerning the bottom that is connected in the oxidation bed corresponding with it one to one; Be connected with n the transfer valve of giving vent to anger on the said flue gas outlet pipe, each transfer valve of giving vent to anger is all according to concerning the bottom that is connected in the oxidation bed corresponding with it one to one; Be connected with n blow down valve on the said scavenging pipeline, each blow down valve is all according to concerning the bottom that is connected in the oxidation bed corresponding with it one to one; Be connected with n extraction valve on the said fume extraction pipeline, each extraction valve is all according to concerning the medium position that is connected in the oxidation bed corresponding with it, i.e. clearance space between high-temperature region and the low-temperature space one to one; Said fuel conduit is connected to the combustion chamber of device through fuel valve, and said combustion air pipeline is connected to the combustion chamber of device through the combustion air valve;
Said device also comprises control module, and said control module is used to control above-mentioned all valves.
Further, said n is 3;
Further, the outlet of said fume extraction pipeline is connected with outside UTILIZATION OF VESIDUAL HEAT IN equipment.
The invention has the beneficial effects as follows:
1, multibed type ventilation air gas regenerative oxidation device of the present invention adopts the structure of a plurality of oxidation beds; In accumulation of heat and heat release circulation, increase by one and purged purification process; The oxidation unit of traditional structure is remained in the not oxidised reaction ventilation air gas purging oxidation to the combustion chamber between transfer valve and the reaction compartment in the moment of commutating; Thereby prevent that the weary wind of not oxidation directly is discharged in the atmosphere, oxygenation efficiency can be increased to more than 99%;
2, multibed type ventilation air gas regenerative oxidation device of the present invention is from extracting high-temperature flue gas between oxidation bed high-temperature region and the low-temperature space; Both extracted unnecessary heat; Can guarantee temperature and amount of stored heat that high-temperature region heat storage storing methane oxidation is required again, improve the operation stability of oxidation unit;
3, extraction valve and air inlet transfer valve, the transfer valve of giving vent to anger interlock guarantee to be extracted after gas flows through combustion chamber and high-temperature region heat storage fully again, can guarantee methane complete oxidation in the ventilation air gas, have improved the methane oxidation rate;
4, when adopting five and above structure; The treating capacity that ventilation air gas regenerative oxidation device is single reduces; The oxidation bed cross-sectional area reduces, and distribution of air flow is more even in the oxidation bed, has avoided oxidation unit uneven situation of internal gas flow when treating capacity is big of traditional structure.
Other advantages of the present invention, target and characteristic will be set forth in manual subsequently to a certain extent; And to a certain extent; Based on being conspicuous to those skilled in the art, perhaps can from practice of the present invention, obtain instruction to investigating of hereinafter.Target of the present invention and other advantages can realize and obtain through following manual and claims.
Description of drawings
In order to make the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that the present invention is made further detailed description below, wherein:
Fig. 1 is a structural representation of the present invention.
The specific embodiment
Below will carry out detailed description to the preferred embodiments of the present invention with reference to accompanying drawing.Should be appreciated that preferred embodiment has been merely explanation the present invention, rather than in order to limit protection scope of the present invention.
As shown in Figure 1; Embodiment is to be example with three formula structures, among the figure: 1, weary wind air inlet pipe 2, extraction valve 1, air inlet transfer valve 1, the transfer valve 1 of giving vent to anger, blow down valve 1, extraction valve 27, air inlet transfer valve 28, the transfer valve 29 of giving vent to anger, blow down valve 2 10, extraction valve 3 11, air inlet transfer valve 3 12, the transfer valve 3 13 of giving vent to anger, fume extraction pipeline 14, flue gas escape pipe 15, scavenging pipeline 16, blow down valve 3 17, support aperture plate 18, oxidation bed 3 19, thermal insulation fire-resistant material 20, combustion chamber 21, oxidation bed 2 22, preheater 23, combustion air valve 24, fuel valve 25, fuel conduit 26, combustion air pipeline 27, oxidation bed 1, control module 29, holding wire.
The inventive system comprises 3 oxidation beds; 3 oxidation beds adopt mode side by side vertical and that top is communicated with to combine, and form the device body of a vertical structure, and combustion chamber 20 is formed jointly at the top that all oxidation beds are connected together; The bottom of each oxidation bed is provided with supports aperture plate 17; Propping bar is provided with certain thickness ceramic rectangular saddle ring on the net, and the top of ceramic rectangular saddle ring is stacked with honeycomb ceramic heat accumulator, and honeycomb ceramic heat accumulator is divided into high-temperature region and low-temperature space according to upper and lower relation; Leave the gap between two-layer, the outer setting of device body is useful on the thermal insulation fire-resistant material that surrounds device body; The thermal insulation fire-resistant material adopts this area thermal insulation fire-resistant material commonly used to get final product.
Wherein, weary wind air inlet pipeline 1 is connected with the bottom of oxidation bed 1, oxidation bed 2 21, oxidation bed 3 18 respectively through air inlet transfer valve 1, air inlet transfer valve 27, air inlet transfer valve 3 11; Flue gas outlet pipe 14 is connected with the bottom of oxidation bed 1, oxidation bed 2 21, oxidation bed 3 18 respectively through the transfer valve 1 of giving vent to anger, the transfer valve 28 of giving vent to anger, the transfer valve 3 12 of giving vent to anger; Scavenging pipeline 15 is connected with the bottom of oxidation bed 1, oxidation bed 2 21, oxidation bed 3 18 respectively through blow down valve 1, blow down valve 29, blow down valve 3 16; Weary wind gets into each oxidation bed through weary wind air inlet pipe, air inlet transfer valve, and the flue gas after the oxidation is discharged from the flue gas escape pipe through the transfer valve of giving vent to anger.Scavenging pipeline is connected with oxidation bed through blow down valve, and scavenging pipeline is introduced a small amount of flue gas and got into oxidation bed, and the moment of will commutating, unoxidized weary wind blew into combustion chamber, will lack methane complete oxidation in the wind.
And fume extraction pipeline 13 is connected with the middle part of oxidation bed 1, oxidation bed 2 21, oxidation bed 3 18 respectively through extraction valve 1, extraction valve 26, extraction valve 3 10; Specifically be to be connected at the high-temperature region of oxidation bed and the clearance space between the hypothermic phase; From extracting high-temperature flue gas between oxidation bed high-temperature region and the low-temperature space; Both extract unnecessary heat, and can guarantee temperature and amount of stored heat that high-temperature region heat storage storing methane oxidation is required again, improved the operation stability of oxidation unit; Combustion air pipeline 26 is connected to preheater 22 through combustion air valve 23, fuel conduit 25 through fuel valve 24, and said preheater is arranged in the combustion chamber.Extraction valve 1, air inlet transfer valve 1, the transfer valve 1 of giving vent to anger, blow down valve 1, extraction valve 26, air inlet transfer valve 27, the transfer valve 28 of giving vent to anger, blow down valve 29, extraction valve 3 10, air inlet transfer valve 3 11, the transfer valve 3 12 of giving vent to anger, blow down valve 3 16, combustion air valve 23, fuel valve 24 link to each other with control module 28 through holding wire 29 respectively.
With three formula ventilation air gas regenerative oxidation devices is example; Its course of work is: at first; The startup stage produce high-temperature flue gas by preheater combustion oil or fuel gas, high-temperature flue gas is with each oxidation bed heating, oxidation bed forms the low thermal field of relative superiority or inferiority; Wherein thermal storage ceramic temperature in high-temperature region reaches 800 ~ 1000 ℃, turns off preheater then.After preheating was accomplished, device got into normal operating conditions.A complete work period is made up of three circulations.
Circulation one: air inlet transfer valve one, the transfer valve two of giving vent to anger, blow down valve three, extraction valve two are in opening, and air inlet transfer valve two, air inlet transfer valve three, the transfer valve one of giving vent to anger, the transfer valve three of giving vent to anger, blow down valve one, the inferior valve two, extraction valve one, extraction valve three swept are in closed condition.Ventilation air gas gas through weary wind air inlet pipe, air inlet transfer valve one, support aperture plate, get into oxidation bed one from the oxidation bed bottom, in oxidation bed in the flow process by the honeycomb ceramic heat accumulator heating, temperature raises gradually.Oxidation reaction takes place and generates carbon dioxide and water in ventilation air gas in the combustion chamber, emit heat simultaneously, and the flue-gas temperature that generates after the oxidation raises.Flue gas continues to flow then, flows downward from oxidation bed two, and flue gas carries out interchange of heat with the high-temperature region heat storage; Flue gas self temperature reduces, and the high-temperature region heat storage is heated, and after this flue gas is divided into two-way: part of smoke continues in oxidation bed two, to flow downward; Carry out interchange of heat with the low-temperature space heat storage, flue gas self temperature continues to reduce, and the low-temperature space heat storage is heated; Last flue gas flows out from oxidation bed two bottoms, through supporting aperture plate, the transfer valve two of giving vent to anger, the discharge of flue gas escape pipe; Another part flue gas flows to UTILIZATION OF VESIDUAL HEAT IN equipment and utilizes through extraction valve two, fume extraction pipeline.Simultaneously, scavenging pipeline introduce partial fume through blow down valve three, support aperture plate, flow into from oxidation bed three bottoms, the residual gas in the oxidation bed three is purged, gas in the combustion chamber oxidation after peroxidating bed two flow out.In this circulation, heat storage heat release in the oxidation bed one, heat storage accumulation of heat in the oxidation bed two purges residue gas in the oxidation bed three.
Circulation two: air inlet transfer valve two, the transfer valve three of giving vent to anger, blow down valve one, extraction valve three are in opening, and air inlet transfer valve one, air inlet transfer valve three, the transfer valve one of giving vent to anger, the transfer valve two of giving vent to anger, blow down valve two, the inferior valve three, extraction valve one, extraction valve two swept are in closed condition.Ventilation air gas gets into oxidation bed two, is got into the combustion chamber after the preheating, and reaction back flue gas gets into oxidation bed three, discharges after partial fume is cooled, and partial fume flows to UTILIZATION OF VESIDUAL HEAT IN equipment and utilizes through extraction valve three, fume extraction pipeline.This moment, oxidation bed one usefulness flue gas purged, and the gas behind the purging is discharged through oxidation bed three with flue gas after the reaction of combustion chamber.In this circulation, in the oxidation bed one residue gas is purged heat storage heat release in the oxidation two, heat storage accumulation of heat in the oxidation bed three.
Circulation three: air inlet transfer valve three, the transfer valve one of giving vent to anger, blow down valve two, extraction valve one are in opening, and air inlet transfer valve one, air inlet transfer valve two, the transfer valve two of giving vent to anger, the transfer valve three of giving vent to anger, blow down valve one, the inferior valve three, extraction valve two, extraction valve three swept are in closed condition.Ventilation air gas gets into oxidation bed three, is got into the combustion chamber after the preheating, and reaction back flue gas gets into oxidation bed one, discharges after partial fume is cooled, and partial fume flows to UTILIZATION OF VESIDUAL HEAT IN equipment and utilizes through extraction valve one, fume extraction pipeline.This moment, oxidation bed dual-purpose flue gas purged, and the gas behind the purging is discharged through oxidation bed one with flue gas after the reaction of combustion chamber.In this circulation, heat storage accumulation of heat in the oxidation bed one purges residue gas in the oxidation bed two, heat storage heat release in the oxidation three.
After circulation three finishes, return circulation one, running continuously goes round and begins again.Control module is provided with the switching of each valve of control according to system.Three concise and to the point statements as follows of the formula ventilation air gas regenerative oxidation device course of work:
| ? | Oxidation bed one | Oxidation bed two | Oxidation bed three |
| Circulation one | Heat release | Accumulation of heat | Purge |
| Circulation two | Purge | Heat release | Accumulation of heat |
| Circulation three | Accumulation of heat | Purge | Heat release |
Three formula ventilation air gas regenerative oxidation devices are applicable to little of medium weary wind flow.When weary wind flow is very big (generally greater than 60000 m3/h), should adopt five formula ventilation air gas regenerative oxidation devices, i.e. two two parallel connections add that is used for a flushing.Equally, when treating capacity is bigger, available seven Room or nine Room.Analogize with above-mentioned three formula device courses of work, five formula ventilation air gas regenerative oxidation device courses of work can be represented as follows:
| ? | Oxidation bed one | Oxidation bed two | Oxidation bed three | Oxidation bed four | Oxidation bed five |
| Circulation one | Accumulation of heat | Accumulation of heat | Heat release | Heat release | Purge |
| Circulation two | Purge | Accumulation of heat | Accumulation of heat | Heat release | Heat release |
| Circulation three | Heat release | Purge | Accumulation of heat | Accumulation of heat | Heat release |
| Circulation four | Heat release | Heat release | Purge | Accumulation of heat | Accumulation of heat |
| Circulation five | Accumulation of heat | Heat release | Heat release | Purge | Accumulation of heat |
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the aim and the scope of present technique scheme, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (3)
1. multibed type ventilation air gas regenerative oxidation device; It is characterized in that: said device comprises n oxidation bed, and said n is the integer more than or equal to 3, and said n oxidation bed adopts mode side by side vertical and that top is communicated with to combine; Form the device body of a vertical structure; The combustion chamber is formed jointly at the top that all oxidation beds are connected together, and the bottom of each oxidation bed is provided with the support aperture plate, and propping bar is provided with certain thickness ceramic rectangular saddle ring on the net; The top of pottery rectangular saddle ring is stacked with honeycomb ceramic heat accumulator; Said honeycomb ceramic heat accumulator is divided into high-temperature region and low-temperature space according to upper and lower relation, leaves the gap between two-layer, and the outer setting of device body is useful on the thermal insulation fire-resistant material that surrounds device body;
Said device also comprises weary wind air inlet pipeline, fume extraction pipeline, flue gas outlet pipe, scavenging pipeline, fuel conduit and combustion air pipeline; Be connected with n air inlet transfer valve on the said weary wind air inlet pipeline, each air inlet transfer valve is all according to concerning the bottom that is connected in the oxidation bed corresponding with it one to one; Be connected with n the transfer valve of giving vent to anger on the said flue gas outlet pipe, each transfer valve of giving vent to anger is all according to concerning the bottom that is connected in the oxidation bed corresponding with it one to one; Be connected with n blow down valve on the said scavenging pipeline, each blow down valve is all according to concerning the bottom that is connected in the oxidation bed corresponding with it one to one; Be connected with n extraction valve on the said fume extraction pipeline, each extraction valve is all according to concerning the medium position that is connected in the oxidation bed corresponding with it, i.e. clearance space between high-temperature region and the low-temperature space one to one; Said fuel conduit is connected to the combustion chamber of device through fuel valve, and said combustion air pipeline is connected to the combustion chamber of device through the combustion air valve;
Said device also comprises control module, and said control module is used to control above-mentioned all valves.
2. multibed type ventilation air gas regenerative oxidation device according to claim 1, it is characterized in that: said n is 3.
3. multibed type ventilation air gas regenerative oxidation device according to claim 1 is characterized in that: the outlet of said fume extraction pipeline is connected with outside UTILIZATION OF VESIDUAL HEAT IN equipment.
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| CN103306716B (en) * | 2013-07-03 | 2015-04-08 | 中煤科工集团重庆研究院有限公司 | Heat storage and oxidation system for ventilation air gas and united pre-heat starting method of heat storage and oxidation system |
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| CN104534487A (en) * | 2014-12-16 | 2015-04-22 | 江苏百茂源环保科技有限公司 | Heat storage burning system |
| CN104848233A (en) * | 2015-05-12 | 2015-08-19 | 北京矿大节能科技有限公司 | Coal-mine gas boiler with very low concentration and operation method thereof |
| CN106051792A (en) * | 2016-05-30 | 2016-10-26 | 江苏三井环保股份有限公司 | RTO (regenerative thermal oxidizer) regenerative thermal oxidation system |
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| CN109059010B (en) * | 2018-06-13 | 2020-03-24 | 重庆大学 | Low-concentration gas oxidation heat utilization device |
| CN109028110A (en) * | 2018-07-25 | 2018-12-18 | 中煤科工集团重庆研究院有限公司 | A kind of oxidation unit and its packing method of the fill containing Combined porous medium |
| CN110094743A (en) * | 2019-05-24 | 2019-08-06 | 上海兰宝环保科技有限公司 | A kind of three Room exchange heat accumulation type off-gas incineration treatment 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 |
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