CN201981222U - Recovery device for gas exhausted from top of blast furnace - Google Patents
Recovery device for gas exhausted from top of blast furnace Download PDFInfo
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- CN201981222U CN201981222U CN2010206792637U CN201020679263U CN201981222U CN 201981222 U CN201981222 U CN 201981222U CN 2010206792637 U CN2010206792637 U CN 2010206792637U CN 201020679263 U CN201020679263 U CN 201020679263U CN 201981222 U CN201981222 U CN 201981222U
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- gas
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Abstract
The utility model provides a recovery device for gas exhausted from top of a blast furnace. The recovery device comprises a buffer tank and at least a bag-type dust remover. The buffer tank is connected with a blast furnace charging bucket by a coal gas recycling valve, the bag-type dust remover is connected with the buffer tank in series, the outlet end of the bag-type dust remover is connected with a pure coal gas pipe network, and a coal gas check valve is arranged between the bag-type dust remover and the pure coal gas pipe network; and the bottom of the blast furnace charging bucket is further connected with a nitrogen supply device, and a control valve is arranged between the blast furnace charging bucket and the nitrogen supply device for controlling the supply of the nitrogen. The recovery device for the gas exhausted from the top of the blast furnace effectively solves problems of toxic gas emission and dust pollution, cannot occupy the limited space of the furnace top and increase the load of the frame of the furnace top, has simple structure and high safety and is easy to arrange; meanwhile, the recovery device has good effect of removing dust and can recycle the coal gas completely; the recycled gas can be directly sent to a clean gas pipeline hardly without the influence of pressure oscillation.
Description
Technical field
The utility model relates to a kind of dry bag-type dust remover that is used for and carries out the device that the blast furnace furnace roof is all pressed the coal-gas recovering method, and especially a kind of have the nature recovery system, or natural recovery system adds nitrogen and forces the blast furnace furnace roof of recovery system all to press gas recovering device.
Background technology
Blast furnace is produced necessary furnace roof and is all pressed coal gas all to be diffused in the atmosphere before each charging.The main drawback that these coal gas directly diffuse in the atmosphere is:
1, C0 content is big in the coal gas, and toxicity is big, the severe exacerbation air quality;
2, the discharge process noise is big, disturbs residents round the clock;
3, dust content height in the coal gas, the chronic pollution atmospheric environment.
Therefore, all pressing the discharging of coal gas for the blast furnace furnace roof for a long time is the problem that this area attempts to solve.With Japanese IHI company is the tornado dust collector of representative---spray recovery process, owing to reclaim the dustiness height of coal gas, pressure surge is big, thereby the application of failing to put it over.The little Venturi meter that France Dunkirk blast furnace adopts can only be applied to adopt the furnace roof of wet method dedusting system blast furnace all to press coal-gas recovering.Because the wet dedusting water consumption is big, the power consumption height, gas temperature declines to a great extent, and a large amount of gas heats are wasted.
In No. the 90106036.4th, Chinese patent application, disclose a kind of " apparatus for enforced recovery of gas exhausted from top of blast furnace ", this retrieving arrangement is made up of injector, venturi scrubber and water trap, at Venturi meter aditus laryngis place inner chamber medium nozzle and water-jet are installed, with the low-pressure steam is the injection medium, so that pressure-discharging gas reclaims fast, and purifying and dedusting and reduce impact to the purified gas pipe network.This known technology when when loading device need all be pressed, all presses coal gas to enter loading device through pressure-equalizing passageway; When the loading device row pressure, pressure-discharging gas enters the step-down tower apparatus through purge valve, fly-ash separator, enters the purified gas pipe network at last.What this known technology adopted is wet dedusting, and need carry out step-down to coal gas by water trap and handle, so its equipment complexity, and the coal gas after handling exists said temperature to descend significantly equally, the defective that water, the electric consumption are big etc. wastes energy.
Because blast furnace in process of production, top charging equipment is periodically to carry out material feeding, all pressure, discharge, all to press diffusing of coal gas also be periodically to carry out, therefore, in blast furnace production process, all pressing coal gas is constantly to diffuse, in known discharge process, exist the pollution serious to environment, and the waste a large amount of to the energy.Along with the raising that energy-saving and emission-reduction require, reclaim the furnace roof of blast furnace more effectively and all press coal gas to become a problem demanding prompt solution.
The utility model content
The utility model relates to a kind of blast furnace furnace roof and all presses gas recovering device.Device of the present utility model comprises the nature recovery system, or natural recovery system adds the pressure recovery system, and device of the present utility model can be avoided toxic gas is discharged in atmosphere, and effectively the waste heat of coal gas is all pressed in utilization.
The utility model proposes a kind of blast furnace furnace roof for this reason and all press gas recovering device, wherein, described retrieving arrangement comprises: surge tank, at least one sack cleaner, wherein, described surge tank is connected with blast furnace bucket by a coal gas recovery valve, described sack cleaner and described surge tank are connected in series, and the exit end of described sack cleaner is connected with the purified gas pipe network, and are provided with gas check valve between sack cleaner and the purified gas pipe network.
Aforesaid blast furnace furnace roof is all pressed gas recovering device, and wherein, the bottom of described blast furnace bucket further is connected with the nitrogen feedway, and between be provided with the control valve that control nitrogen is supplied with.
Aforesaid blast furnace furnace roof is all pressed gas recovering device, wherein, is provided with reducing valve, nitrogen trip valve and vacuum breaker between described nitrogen feedway and the blast furnace bucket successively at least.
Blast furnace furnace roof of the present utility model all presses gas recovering device to overcome the dustiness height of prior art existence recovery coal gas; pressure surge is big; to problems such as the purified gas pipe network pollute; efficiency solves toxic gas discharging and dust pollution; alleviate the sound damper load; the furnace roof arrangement convenience meets the characteristics of the environmental protection requirement of increasing day by day.
Furnace roof of the present utility model is all pressed gas recovering device, does not take the limited space of furnace roof and increases the load of furnace top frame, simple in structure, be easy to arrange, safe; Simultaneously, good dedusting effect, to reclaim coal gas clean, and the coal gas after the recovery directly enters the purified gas pipe network, the purified gas pipe network polluted little, and almost do not have the influence of pressure surge, can reduce the discharging of toxic gas to greatest extent, accomplishes real environmental protection.
The utility model is at energy scarcity and emphasizes today of environment protection, avoid toxic gas to airborne release, reclaim the energy, improve the effective measure of environment.It has thoroughly solved the problem that the blast furnace furnace roof that adopts dry bag-type dust remover is all pressed the coal-gas recovering difficulty.
Description of drawings
The following drawings only is intended to the utility model done and schematically illustrates and explain, does not limit scope of the present utility model.Wherein,
Fig. 1 is the structural representation that blast furnace furnace roof of the present utility model is all pressed an embodiment of gas recovering device;
Fig. 2 is the structural representation that blast furnace furnace roof of the present utility model is all pressed another embodiment of gas recovering device.
The drawing reference numeral explanation
10, batch can 11, tornado dust collector 12, pressure-equalizing and discharging valve
13, sound damper 14, equalizing valve 15, the equal pressing system of secondary
2, natural recovery system 20, coal gas recovery valve 21, surge tank
22, sack cleaner 23, vacuum breaker 24, purified gas pipe network
3, force recovery system 30, nitrogen feedway 31, reducing valve
32, nitrogen trip valve 33, vacuum breaker 34,35, dish valve
Embodiment
Please cooperate referring to Fig. 1, the blast furnace furnace roof that the utility model proposes all presses gas recovering device to comprise: surge tank 21, at least one sack cleaner 22, wherein, described surge tank 21 is connected with blast furnace bucket 10 by a coal gas recovery valve 20, described sack cleaner 22 is connected in series with described surge tank 21, the exit end of described sack cleaner 22 is connected with purified gas pipe network 24, and is provided with gas check valve 23 between sack cleaner 22 and the purified gas pipe network 24.Described surge tank 21, sack cleaner 22 can be arranged on blast furnace suitable position on every side, only need to be connected with blast furnace bucket 10, purified gas pipe network respectively by pipeline, therefore retrieving arrangement of the present utility model does not take the effective space of blast furnace furnace roof, and can not increase the load of furnace top frame, simple in structure, easy layout, and have higher security.
Principle of work of the present utility model is: enter behind batch can 10 charging procedures in the shaft furnace charging system, open earlier to connect and all press gas recovering device and batch can all to press the coal gas recovery valve 20 of coal gas discharge pipe, and open the vacuum breaker 23 of the inlet mouth end of purified gas pipe network 24.Then the higher all pressures coal gas of the pressure of discharging in the batch can 10 with at a high speed by at first entering surge tank 21 behind the coal gas recovery valve 20, be reduced in surge tank 21 internal pressures, post-decompressionly all press coal gas to enter sack cleaner 22 to carry out dust removal by filtration, all pressures coal gas clean after described sack cleaner 22 dedustings is transported in the described purified gas pipe network 24.When the pressure in the described batch can 10 and the pressure in the surge tank 21 approaching, for example the pressure in described batch can 10 reaches 1.5～2.0 normal atmosphere, then finish described natural recycling step of all pressing coal gas, cut off described coal gas recovery valve 20, open pressure-equalizing and discharging valve 12, all press coal gas after tornado dust collector 11 dedustings the residue in the described batch can 10, diffuse in the atmosphere through pressure-equalizing and discharging valve 12 and sound damper 13 again.The utility model is owing to all pressures coal gas in the batch can 10 at first enter in the surge tank 21, after being reduced, the pressure of all pressing coal gas enters into sack cleaner 22 again, thereby reduced the impact of high pressure gas to sack cleaner 22, improved the work-ing life of sack cleaner 22, and through behind the surge tank 21, the pressure that enters the clean gas after sack cleaner 22 and the dedusting is comparatively balanced, the purified gas pipe network is not almost had the influence of pressure surge.In addition, sack cleaner 22 does not limit and only is provided with one, can be provided with a plurality of according to actual needs, when a plurality of sack cleaner 22 is set, can adopt between each sack cleaner and be connected in series, thereby further improve dust removing effects, can certainly be connected in parallel, to improve to all pressing the dedusting speed of coal gas.The coal gas that retrieving arrangement of the present utility model has good dedusting effect, recovery is clean, and the clean gas after the dedusting directly enters the purified gas pipe network, the advantage little to the pollution of purified gas pipe network.
The nature required time of removal process is determined according to the actual conditions of different blast furnaces, correlation parameter such as batch can pressure as the caliber of the volume of furnace top pressure, surge tank, pressure-equalizing and discharging pipeline and when setting nature and reclaiming termination is by high pressure gas emergent pressure calculation formula
Calculate pressure ratio, to judge that high pressure gas are in criticality or subcritical state.When
The time, all press coal gas to be in criticality, all pressures coal gas in the batch can flows to surge tank with velocity of sound; When
The time, all press coal gas to be in subcritical state, all pressures coal gas in the batch can with
So flow to surge tank.As batch can resulting pressure P '
0When reaching set(ting)value, reclaim to finish naturally, this moment the surge tank pressure P '
*Near and be slightly less than batch can resulting pressure P '
0
Wherein, k---gas adiabatic exponent
Gas density in ρ---the batch can
P
*---the surge tank absolute pressure
P
0---the batch can absolute pressure
P '
0---batch can resulting pressure when the subcritical state of setting finishes the nature removal process
P '
*---subcritical state surge tank pressure when finishing the nature removal process
With a concrete example the present invention is further specified below.Volume as batch can 10 is 80m
3, the volume of surge tank 21 is 220m
3, the caliber of pressure-equalizing and discharging pipeline is 300mm, and sets and finish when the pressure in the batch can 10 is 1.5 normal atmosphere all pressing reclaiming naturally of coal gas.When the shaft furnace charging system enters to batch can 10 charging procedures, the original pressure in the batch can 10, i.e. batch can absolute pressure P
0Be under the 3.5 atmospheric conditions, open and all press gas recovering device that all pressures coal gas of discharging from batch can 10 at first passes through coal gas recovery valve 20, enters surge tank 21, again through entering purified gas pipe network 24 after sack cleaner 22 dedustings.At first by high pressure gas emergent pressure calculation formula
Judging all presses coal gas to be in criticality or subcritical state.Before the recovery, surge tank absolute pressure P
*Equate with ductwork pressure, for example P
*Be 1.1 normal atmosphere, then
Calculate gas adiabatic exponent k=1.376 according to coal gas composition at that time, then
Find out thus,
All press coal gas to be in criticality this moment, and coal gas flows to surge tank with velocity of sound, and this stage approximately needs 4.57 seconds, and the pressure in the batch can 10 is reduced to 2.54 normal atmosphere.Afterwards, all press coal gas to enter subcritical state, continue to reclaim all pressing coal gas to carry out nature, all pressures coal gas in the batch can 10 flows naturally to surge tank 21, when the pressure in the batch can 10 reaches 1.5 normal atmosphere of setting, finish the nature removal process, the recovery time in this stage is about 7.87 seconds.The nature removal process finishes, and cuts off coal gas recovery valve 20 and closes the nature recovery system.Then, according to the shaft furnace charging program with the residual gas in the batch can after tornado dust collector 11 dedustings, diffuse through pressure-equalizing and discharging valve 12 and sound damper 13 again, the dust in the tornado dust collector 11 is in blowback is melted down in next pressure equalizing.
In this example, adopt the nature recovery method required to all pressing reclaiming naturally and diffuse about 12.44 seconds of time of coal gas, approximately can reclaim approximately 60% to all pressures coal gas in the no bell batch can, other 40% all presses coal gas to enter atmosphere.Be that present method can reclaim all pressures coal gas of 60%, overcome in the prior art, this partially recycled heat of all pressing coal gas is utilized, reduced atmospheric pollution with its whole defectives of discharging.
Fig. 2 is the structural representation that blast furnace furnace roof of the present utility model is all pressed another embodiment of gas recovering device.As shown in the figure, this retrieving arrangement comprises: natural recovery system 2 and pressure recovery system 3.Wherein natural recovery system has surge tank 21, at least one sack cleaner 22, wherein, described surge tank 21 is connected with blast furnace bucket 10 by a coal gas recovery valve 20, described sack cleaner 22 is connected in series with described surge tank 21, the exit end of described sack cleaner 22 is connected with purified gas pipe network 24, and is provided with gas check valve 23 between sack cleaner 22 and the purified gas pipe network 24.And described blast furnace bucket 10 further is connected with nitrogen feedway 30, and between be provided with the control valve that control nitrogen is supplied with.And described nitrogen feedway 30 is connected with the bottom of batch can 10, is beneficial to and will all presses coal gas all to drive discharge tank 10.
For example, between described nitrogen feedway 30 and blast furnace bucket 10, can set gradually reducing valve 31, nitrogen trip valve 32 and vacuum breaker 33, according to actual needs, other control valves can also be set, as shown in Figure 2, between nitrogen feedway 30, reducing valve 31, and also be respectively equipped with dish valve 34,35 between the nitrogen trip valve 32, vacuum breaker 33.Above-mentioned nitrogen feedway 30, reducing valve 31, nitrogen trip valve 32 and vacuum breaker 33 have constituted pressure recovery system 3.
Principle of work of the present utility model is: enter behind batch can 10 charging procedures in the shaft furnace charging system, open earlier to connect and all press gas recovering device and batch can all to press the coal gas recovery valve 20 of coal gas discharge pipe, and open the vacuum breaker 23 of the inlet mouth end of purified gas pipe network 24.At first carry out nature and reclaim, its concrete steps are identical with the natural recovery method of above-mentioned record with method, do not repeat them here.When the pressure in the described batch can 10 reaches the specified pressure value, the nature recycling step finishes to carry out described pressure recycling step: charge into nitrogen by nitrogen feedway 30 in described batch can 10, under the ordering about of nitrogen, make the described coal gas of all pressing of residue in the described batch can 10 enter described surge tank 21, after being full of nitrogen in the described batch can 10, cut off described coal gas recovery valve 20, and stop to described batch can 10 inflated with nitrogen.
In forcing recycling step, described specified pressure value is diffused original pressure when all pressing coal gas less than described batch can 10, and greater than described purified gas pipe network 24 internal pressures.When the pressure in the described batch can 10 and the pressure in the surge tank 21 approaching, as, when the pressure in the described batch can 10 reaches 1.5～2.0 normal atmosphere, can in described batch can, charge into nitrogen.
In described pressure recycling step, for all being driven, all pressures coal gas of batch can 10 enters surge tank 21, avoid directly discharging to atmosphere, the nitrogen amount that charges in described batch can 10 should be more than or equal to 1.5 times described batch can volume, to guarantee and will all press coal gas all to drive in the surge tank.
After being full of nitrogen in the described batch can 10, finish described pressure recycling step of all pressing coal gas, cut off described coal gas recovery valve 20, open pressure-equalizing and discharging valve 12, nitrogen in the described batch can 10 through tornado dust collector 11 dedustings, is diffused in the atmosphere through pressure-equalizing and discharging valve 12 and sound damper 13 again.
Described natural recycling step and pressure recycling step required time sum should be less than the times of described charging system permission.All pressures coal gas drain time according to charging system permission in the production of reality, set to force the force value in the batch can that recycling step begins, and particular case such as the flow of the nitrogen that can provide according to the nitrogen feedway, flow velocity and definite needed time of inflated with nitrogen.
Be described further with a concrete example below.The blast furnace furnace roof is all pressed the coal-gas recovering operation steps: at furnace roof absolute pressure 3.5 normal atmosphere, batch can volume 80m
3, surge tank volume 220m
3, the pressure-equalizing and discharging pipeline caliber 300mm condition under, after the shaft furnace charging system enters the batch can charging procedure, open and all press gas recovering device, all pressures coal gas of discharging from batch can 10 at first passes through coal gas recovery valve 20, enter surge tank 21, enter purified gas pipe network 24 through after the strainer dedusting of sack cleaner 22 again.When the pressure in batch can 10 was in criticality, promptly when surge tank flowed, recovery time was 4.57 seconds to coal gas with velocity of sound.When the batch can internal pressure is by P
0=2.54 normal atmosphere are reduced to batch can and are set the 1.5 normal atmosphere stages of resulting pressure, and required recovery time is about 7.87 seconds, more than is nature recycling step (its principle is identical with previous embodiment, does not repeat them here).If after the pressure of batch can reaches set(ting)value 1.5 normal atmosphere, then begun the pressure recycling step: open and all press coal gas to force recovery system 3, behind butterfly valve 34, reducing valve 31 and nitrogen trip valve 32, butterfly valve 35, vacuum breaker 33, described nitrogen feedway 30 charges into nitrogen by the bottom of batch can 10 in batch can 10, all press coal gas to catch up with into purified gas pipe network 24 through all pressing coal gas nature recovery system 2 residue in the batch can 10.Surpassed the volume of 1.5 times batch can 10 through the nitrogen that charge into after 9.89 seconds in the batch can 10, thereby guaranteed that nitrogen is full of batch can 10, then stopped filling nitrogen, closed and force recovery system 3, and cut off coal gas recovery valve 20 to batch can 10.Then, according to the shaft furnace charging program nitrogen in the batch can is diffused through tornado dust collector 11, pressure-equalizing and discharging valve 12 and sound damper 13, this diffuses the stage required time approximately needs 5 seconds.
Naturally the device that adds the pressure recovery that reclaims of the present utility model can almost all enter the purified gas pipe network with all pressures coal gas in the no bell batch can, avoid all pressing coal gas to enter atmosphere, reduce environmental pollution, required time is nature recovery time 12.44 seconds and forces to reclaim and diffuse 14.89 seconds time sum that duration of service is long slightly.Certainly, when concrete implementation and operation, the time that can reasonably distribute nature to reclaim and force to reclaim two steps according to the condition of production is to guarantee that blast furnace loads the material operation normally.When the filling material activity duration that allows more in short-term, can suitably shorten the time that nature reclaims, promptly improve the pressure set points in the batch can when beginning to force recycling step, when the batch can internal pressure reaches this set(ting)value, finish nature and reclaim, open and force recovery system 3, in batch can 10, charge into nitrogen.According to design of the present utility model, all press in the process of coal gas at recovery blast furnace furnace roof, when guaranteeing the coal gas cleanliness factor that reclaims, the means that shorten recovery time are not limited to aforesaid method, as adopting the methods such as flow velocity of suitable increase pipe diameter, raising nitrogen, this this case is not limited.
The above only is the schematic embodiment of the utility model, is not in order to limit scope of the present utility model.Any those skilled in the art, equivalent variations and the modification done under the prerequisite that does not break away from design of the present utility model and principle all should belong to the scope that the utility model is protected.And need to prove, each integral part of the present utility model is not limited in above-mentioned overall applicability, but can combine with other prior art according to actual needs, therefore, the utility model has been contained other combination relevant with this case utility model point and concrete the application in the nature of things.
Claims (3)
1. a blast furnace furnace roof is all pressed gas recovering device, it is characterized in that, described retrieving arrangement comprises: surge tank, at least one sack cleaner, wherein, described surge tank is connected with blast furnace bucket by a coal gas recovery valve, described sack cleaner and described surge tank are connected in series, and the exit end of described sack cleaner is connected with the purified gas pipe network, and are provided with gas check valve between sack cleaner and the purified gas pipe network.
2. blast furnace furnace roof as claimed in claim 1 is all pressed gas recovering device, it is characterized in that, the bottom of described blast furnace bucket further is connected with the nitrogen feedway, and between be provided with the control valve that control nitrogen is supplied with.
3. blast furnace furnace roof as claimed in claim 2 is all pressed gas recovering device, it is characterized in that, is provided with reducing valve, nitrogen trip valve and vacuum breaker between described nitrogen feedway and the blast furnace bucket successively at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206792637U CN201981222U (en) | 2010-12-23 | 2010-12-23 | Recovery device for gas exhausted from top of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206792637U CN201981222U (en) | 2010-12-23 | 2010-12-23 | Recovery device for gas exhausted from top of blast furnace |
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| Publication Number | Publication Date |
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| CN201981222U true CN201981222U (en) | 2011-09-21 |
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| CN2010206792637U Expired - Fee Related CN201981222U (en) | 2010-12-23 | 2010-12-23 | Recovery device for gas exhausted from top of blast furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031321A (en) * | 2010-12-23 | 2011-04-27 | 中冶京诚工程技术有限公司 | Method and device for recovering pressure-equalized coal gas at top of blast furnace |
| CN105177206A (en) * | 2015-10-30 | 2015-12-23 | 中冶南方工程技术有限公司 | Pressure-equalizing blowing-off device and method for blast furnace charging bucket |
| WO2022213578A1 (en) * | 2021-04-08 | 2022-10-13 | 中冶南方工程技术有限公司 | Blast furnace top pressure-equalizing gas purification and recovery device and process |
-
2010
- 2010-12-23 CN CN2010206792637U patent/CN201981222U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031321A (en) * | 2010-12-23 | 2011-04-27 | 中冶京诚工程技术有限公司 | Method and device for recovering pressure-equalized coal gas at top of blast furnace |
| CN102031321B (en) * | 2010-12-23 | 2012-09-05 | 中冶京诚工程技术有限公司 | Method and device for recovering pressure-equalized coal gas at top of blast furnace |
| CN105177206A (en) * | 2015-10-30 | 2015-12-23 | 中冶南方工程技术有限公司 | Pressure-equalizing blowing-off device and method for blast furnace charging bucket |
| CN105177206B (en) * | 2015-10-30 | 2018-09-25 | 中冶南方工程技术有限公司 | A kind of blast furnace bucket pressure-equalizing bleeding device and method |
| WO2022213578A1 (en) * | 2021-04-08 | 2022-10-13 | 中冶南方工程技术有限公司 | Blast furnace top pressure-equalizing gas purification and recovery device and process |
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Legal Events
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110921 Termination date: 20141223 |
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| EXPY | Termination of patent right or utility model |