CN100593677C - Mine wind-lacked gas thermal oxidizing apparatus - Google Patents
Mine wind-lacked gas thermal oxidizing apparatus Download PDFInfo
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- CN100593677C CN100593677C CN200810249860A CN200810249860A CN100593677C CN 100593677 C CN100593677 C CN 100593677C CN 200810249860 A CN200810249860 A CN 200810249860A CN 200810249860 A CN200810249860 A CN 200810249860A CN 100593677 C CN100593677 C CN 100593677C
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Abstract
The invention relates to a ventilation air methane thermal oxidation device comprising an oxidation bed with a thermal insulation layer and a plurality of heat exchangers arranged in the oxidation bed. The ventilation air methane thermal oxidation device is characterized in that a plurality of heat exchangers are divided into two groups and symmetrically arranged on two sides of the central regionof the oxidation bed, each heat exchanger comprises a snake-like heat exchange pipe and square fins which are evenly distributed on the straight line section of the heat exchange pipe, the gap between the adjacent fins on the straight line section of the heat exchange pipe in the same heat exchanger is larger than one half of the central distance of two straight line sections of the heat exchangepipe, and honeycomb ceramics is filled among the heat exchange pipes and between the heat exchangers and the thermal insulation layer. When the oxidation device works, one part of hot gas transfers the heat to media in the heat exchangers through the heat exchangers, the other part of hot gas transfers the heat to the oxidation bed behind the heat exchangers. The ventilation air methane thermal oxidation device has the advantages of convenient installation, low cost, easy replacement, and the like, thereby solving the problem of excessive large temperature difference between the two sides ofthe heat exchangers and improving the stability of the operation of equipment.
Description
Technical field
The present invention relates to a kind of mine air-lack mash gas thermal oxidation apparatus, belong to super low concentration methane counter flow oxidation and low-density technical field of energy recovery.
Background technology
The main component of coal mine gas is a methane, is the gas energy.In order to improve the security of Coal Production, adopt a large amount of the ventilation to discharge coal mine gas (being called mine air-lack) usually.China is coal production big country, annual discharges the gas of nearly 20,000,000,000 standard cubic meters by coal mine methane, and this has not only caused the huge waste of non-renewable energy resources resources, also severe contamination atmospheric environment.If coal mine wind-lack gas is efficiently used, to save 3,000 ten thousand tons of standard coals every year, reduce the CO2 emission of 300,000,000 tons of equivalents, and can change coalmine ventilation and have only expenditure not have the situation of benefit, can greatly improve the enthusiasm that coalmine ventilation is improved in the colliery, make safety in production go on positive cycle, social benefit and economic benefit are huge.At present, often adopt hot counter flow oxidation technology governance and utilize mine air-lack mash gas, it is oxidized to carbon dioxide and water, and reclaim its heat in order to produce hot water and steam etc.The operation principle of hot counter flow oxidation technology is: at first electricity consumption is heated to the oxidation bed core about 1000 ℃, forms the central temperature height, and is that the two ends temperature reduces gradually, near the temperature field of normal distribution.Mine air-lack is with a direction inflow and the oxidation bed by being made up of ceramic honey comb then, and the oxidized bed of gas heats, and temperature improves constantly, until the high-temperature region quilt rapidly oxidation of methane in the middle part of oxidation bed.Then, the hot gas of oxidation continues to move to the another side of bed, and heat is fallen in heat transferred oxidation bed gradually.Along with constantly entering of gas, reaction bed inlet side temperature reduces gradually, and the outlet side temperature raises gradually.Do not have enough heats gas to be heated to before the oxidizing temperature at entrance side, begin commutation, gas flow is reversed.The heat exchanger effectiveness of gas and oxidation bed is very high, and in a balance sysmte, the temperature difference of porch and exit gas is generally less than 40 ℃.Facts have proved that when methane concentration was 0.2% in the weary wind, the oxidation liberated heat can be kept the sub-fraction energy that the heat radiation of oxidation unit surface of shell and exit gas are taken away, oxidation unit still turns round and does not need energy outside the supplementary quota.If methane concentration is higher than at 0.2% o'clock, unnecessary heat can be used from the oxidation bed taking-up.The heat-obtaining technology is very crucial, and it has material impact to the oxidation unit job stability.Normal at present employing is extracted oxidation bed more than heat with the method that heat exchanger is placed in both sides, high-temperature region, oxidation bed center, and the great advantage of this heat taking method is the heat utilization ratio height.But the requirement of heat exchanging device is also very high, unnecessary heat can either be taken out, and guarantees that again the distribution in temperature field is reasonable, avoids the oxidation bed temperature in the heat exchanger outside to cross low and loses heating function to weary wind.Show that by retrieval the built-in heat exchanger that is used for oxidation unit at present has two kinds of finned sheet exchanger and bayonet-tube exchangers.The built-in heat exchanger that " coal mine ventilation air methane oxidation device " (200620081956.X) adopts is the finned sheet exchanger of 2 routines, and heat exchanger is made the integral slab bulk, places both sides, high-temperature region, oxidation bed center respectively.When oxidation unit is worked and since oxidation bed in all gas all by the medium generation heat exchange in heat exchanger and the heat exchanger, exchange capability of heat is too strong, causes the temperature difference of heat exchanger both sides oxidation bed too big.Particularly the hot gas after the oxidation when the heat exchanger with the heat transferred of the overwhelming majority heat exchanger, cause the oxidation bed temperature of heat exchanger back lower, after commutation this part oxidation bed to weary wind to add thermal effect bad, cause oxidation unit fluctuation of service when methane concentration is low.The hot counter-current reactor of MEGTEC company (VOCSIDIZER) inserts both sides, high-temperature region, oxidation bed center equably with heat exchanger tube, in order to reclaim the energy of methane in the mine air-lack.The advantage of this structure is: because heat exchanger tube is evenly distributed in the pottery, heat exchanger tube is more much smaller than the whole finned sheet exchanger that " coal mine ventilation air methane oxidation device " (200620081956.X) adopts to the effect of damming of heat, part heat can transmit backward by the pottery between the heat exchanger tube, thereby make the temperature difference of heat exchanger front and back ceramic bed less, the temperature field shape is comparatively reasonable.But the mode of this cannula type heat-obtaining need be holed to ceramic honey comb.Because bayonet-tube exchanger quantity is more, processing capacity is bigger, has increased cost.When bayonet-tube exchanger is installed, heat exchanger need be inserted in the hole of ceramic honey comb, and then each heat exchanger tube is linked together, inconvenience is installed, also be unfavorable for later ceramic honey comb replacing and maintenance of equipment.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can overcome above-mentioned defective, avoid heat exchanger that gas heat is dammed too much and cause the mine air-lack mash gas thermal oxidation apparatus that the heat exchanger temperature difference is excessive, easy for installation.Its technical scheme is:
Comprise the oxidation bed that is provided with heat-insulation layer and be arranged on the interior a plurality of heat exchangers of oxidation bed, it is characterized in that: a plurality of heat exchangers are divided into two groups of both sides that are arranged symmetrically in the oxidation bed central area, each heat exchanger is made of the square fin of making snakelike heat exchanger tube and be distributed on the heat exchanger tube straightway, is filling with ceramic honey comb between the heat exchanger tube and between heat exchanger and the heat-insulation layer greater than 1/2 centre-to-centre spacing of two straightway heat exchanger tubes in gap between the fin in the same heat exchanger on the adjacent straight line segment heat exchanger tube.
Described mine air-lack mash gas thermal oxidation apparatus, every group of heat exchanger comprises the heat exchanger of two parallel placements, the straightway heat exchanger tube of two heat exchangers staggers mutually.
Described mine air-lack mash gas thermal oxidation apparatus is characterized in that: the end of each heat exchanger is respectively equipped with stiffener, in order to strengthen the intensity of heat exchanger.
Its operation principle is: when oxidation unit was worked, mine air-lack flowed into oxidation bed from the top, and gas is heated by thermal storage ceramic, and temperature improves constantly.When two heat exchangers of weary wind process upside, the temperature of weary wind and the temperature of heat exchanger are more or less the same.Behind the process heat exchanger, weary wind enters high-temperature region, oxidation bed middle part, and methane is by high-temperature oxydation.Then, the hot gas after the oxidation continues to move down.During the heat exchanger of hot gas below process, portion of hot gas carries out heat exchange with heat exchanger, with the medium in the part heat transferred heat exchanger through heat exchanger; Another part gas passes through through the ceramic honey comb between the heat exchanger tube, does not directly contact with heat exchanger, and the oxidation bed below the heat transferred is lowered the temperature gradually.Avoid the excessive problem of heat exchanger temperature difference like this, thereby guaranteed the job stability of oxidation unit.Along with constantly entering of weary general mood body, the temperature on oxidation bed top reduces gradually, and the temperature of bottom raises gradually.Do not have enough heats gas to be heated to before the oxidizing temperature on oxidation bed top, begin commutation, gas enters oxidation bed from the bottom.
The present invention compared with prior art, its major advantage and beneficial effect are:
(1) fills between the heat exchanger tube of each heat exchanger with ceramic honey comb, the width of ceramic honey comb is greater than the width of fin, and the heat exchanger tube of two heat exchangers staggers mutually, and this has just formed the structure that all has pottery to exist around all heat exchanger tubes, and promptly all heat exchanger tubes are all surrounded by pottery.Can either guarantee that heat exchanger tube absorbs the heat of gas uniformly, can guarantee that again a part of air-flow passes through through the pottery between the heat exchanger tube, and do not carry out heat exchange with heat exchanger, too much cause the problem that the heat exchanger temperature difference is excessive thereby avoid heat exchanger that gas heat is dammed.
(2) when mounting heat exchanger, directly heat exchanger is placed on the oxidation bed, and then the ceramic honey comb of arranging in the space between the heat exchanger tube of heat exchanger.Do not need pottery is processed, heat exchanger need not weld in the erecting bed yet.Therefore, easy for installation, save time, expense is low, also safeguard easily and change.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention;
Fig. 2 is an A-A profile embodiment illustrated in fig. 1;
Fig. 3 is a B-B profile embodiment illustrated in fig. 1;
Fig. 4 is the structural representation of middle heat exchanger embodiment illustrated in fig. 1.
Among the figure: 1, supporting network 2, heat-insulation layer 3, heat exchanger 4, oxidation bed 5, ceramic honey comb 6, heat exchanger tube 7, fin 8, stiffener
The specific embodiment
In the embodiment shown in Fig. 1-4: be provided with heat-insulation layer outside the oxidation bed 4, four heat exchangers 3 are divided into two groups of upper and lower both sides that are arranged symmetrically in central area in the oxidation bed 4, each heat exchanger 3 is made of the square fin 7 of making snakelike heat exchanger tube 6 and be distributed on heat exchanger tube 6 straightways, be respectively equipped with stiffener 8 in the end of each heat exchanger 3, in order to strengthen the intensity of heat exchanger 3, the gap between the fin 7 in the same heat exchanger 3 on the adjacent straight line segment heat exchanger tube 6 is greater than 1/2 centre-to-centre spacing of two straightway heat exchanger tubes 6.Two heat exchanger 3 horizontal positioned in each group, the straightway heat exchanger tube 6 of two heat exchangers 3 staggers mutually, and promptly align with 1/2 center of two adjacent straightway heat exchanger tubes 6 of another heat exchanger 3 in straightway heat exchanger tube 6 centers of a heat exchanger 3.Filling with ceramic honey comb 5 between all heat exchanger tubes 6 and between heat exchanger 3 and the heat-insulation layer 2, this has just formed the structure that all heat exchanger tubes 6 are all surrounded by ceramic honey comb 5 like this, and ceramic honey comb 5 is identical with the height of fin 7, makes that installation is very convenient.
Claims (3)
1. mine air-lack mash gas thermal oxidation apparatus, comprise the oxidation bed (4) that is provided with heat-insulation layer (2) and be arranged on the interior a plurality of heat exchangers (3) of oxidation bed (4), it is characterized in that: a plurality of heat exchangers (3) are divided into two groups of both sides that are arranged symmetrically in oxidation bed (4) central area, each heat exchanger (3) is made of the square fin (7) of making snakelike heat exchanger tube (6) and be distributed on heat exchanger tube (6) straightway, gap between the fin (7) in the same heat exchanger (3) on the adjacent straight line segment heat exchanger tube (6) is greater than 1/2 centre-to-centre spacing of two straightway heat exchanger tubes (6), between heat exchanger tube (6), and fill with ceramic honey comb (5) between heat exchanger (3) and the heat-insulation layer (2).
2, mine air-lack mash gas thermal oxidation apparatus as claimed in claim 1 is characterized in that: every group of heat exchanger (3) comprises the heat exchanger (3) of two parallel placements, and the straightway heat exchanger tube (6) of two heat exchangers (3) staggers mutually.
3, mine air-lack mash gas thermal oxidation apparatus as claimed in claim 1 is characterized in that: the end of each heat exchanger (3) is respectively equipped with stiffener (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810249860A CN100593677C (en) | 2008-12-27 | 2008-12-27 | Mine wind-lacked gas thermal oxidizing apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810249860A CN100593677C (en) | 2008-12-27 | 2008-12-27 | Mine wind-lacked gas thermal oxidizing apparatus |
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| Publication Number | Publication Date |
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| CN101464062A CN101464062A (en) | 2009-06-24 |
| CN100593677C true CN100593677C (en) | 2010-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810249860A Expired - Fee Related CN100593677C (en) | 2008-12-27 | 2008-12-27 | Mine wind-lacked gas thermal oxidizing apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907284A (en) * | 2010-09-07 | 2010-12-08 | 山东理工大学 | Evaporation heat exchanger for coal mine wind-lack gas thermal oxidation device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101766952B (en) * | 2009-12-30 | 2012-11-21 | 山东理工大学 | Gas flow reverse control method of ventilation air methane thermal oxidation device of coal mine |
| CN101936179B (en) * | 2010-09-07 | 2012-07-18 | 山东理工大学 | Air extracting and heating coal mine ventilating gas thermal oxidizer unit |
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2008
- 2008-12-27 CN CN200810249860A patent/CN100593677C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907284A (en) * | 2010-09-07 | 2010-12-08 | 山东理工大学 | Evaporation heat exchanger for coal mine wind-lack gas thermal oxidation device |
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| CN101464062A (en) | 2009-06-24 |
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