CN203550636U - Smoke waste heat utilizing device of ferroalloy electric furnace - Google Patents

Smoke waste heat utilizing device of ferroalloy electric furnace Download PDF

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Publication number
CN203550636U
CN203550636U CN201320722924.3U CN201320722924U CN203550636U CN 203550636 U CN203550636 U CN 203550636U CN 201320722924 U CN201320722924 U CN 201320722924U CN 203550636 U CN203550636 U CN 203550636U
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China
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heat exchanger
electric furnace
flue gas
iron alloy
heat
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Expired - Fee Related
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CN201320722924.3U
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Chinese (zh)
Inventor
王惠永
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Beris Engineering and Research Corp
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Beris Engineering and Research Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The utility model provides a smoke waste heat utilizing device of a ferroalloy electric furnace. The smoke waste heat utilizing device of the ferroalloy electric furnace comprises the electric furnace, wherein the electric furnace is provided with a smoke pipeline. The smoke waste heat utilizing device of the ferroalloy electric furnace further comprises heat exchangers, wherein the heat exchangers comprise the first heat exchanger, the second heat exchanger and the third heat exchanger, the three heat exchangers are sequentially connected in the smoke pipeline of the electric furnace in series, a rough dust collector is arranged between the first heat exchanger and the second heat exchanger, centrifugal fans are arranged outside the first heat exchanger and outside the second heat exchanger, and a cloth bag dust collector is arranged between the second heat exchanger and the third heat exchanger. The smoke waste heat utilizing device of the ferroalloy electric furnace can effectively utilize the waste heat of high-temperature smoke and achieve the purposes of energy conservation and emission reduction.

Description

A kind of iron alloy electric furnace flue gas waste heat utilization device
Technical field
The utility model relates to a kind of residual heat using device of flue gas, relates in particular to a kind of flue gas waste heat utilization device of iron alloy electric furnace.
Background technology
At present, iron alloy electric furnace flue gas processing mode is divided into wet method and two kinds of techniques of dry method.Wet dedusting does not utilize fume afterheat substantially, also has the secondary pollution problem of water, and must have huge water treatment facilities, and operating cost is also higher.Therefore, Large Fe alloy closed electric furnace should adopt dry method dust.
Current domestic iron alloy electric furnace dry method dust mainly adopts bag-type dusting, but filter bag heatproof is low, generally ability long-term work at 200~220 ℃, moment, serviceability temperature was less than 280 ℃, so must cool before electric furnace flue gas dedusting to 200~220 ℃, for reducing the load of bag-type dusting, iron alloy electric furnace flue gas need to pass through thick dedusting in advance.
As shown in Figure 1, be the schematic diagram of the dry fume dust arrester of existing ferroalloy closed electric furnace.The technological process of existing iron alloy electric furnace dry fume dust arrester is: high-temperature flue gas is first through water-cooled flue cooling; Then pass through thick dedusting; Through air cooler, continue cooling more afterwards; Last flue gas is purified by bag-type dusting.If iron alloy electric furnace is closed electric furnace, the flue gas after purification need to carry out spraying cooling, to reach, enters the temperature requirement that gas chamber reclaims, when the coal gas CO content reclaiming is on the low side or O 2when concentration is higher, can direct-fire diffuse; If iron alloy electric furnace is semi-hermetic electric furnace or uncovered electric furnace, the flue gas after purification directly enters atmosphere by chimney.And in the dry fume dust arrester of existing semitight or uncovered electric furnace, because not needing that carbon monoxide is reclaimed, therefore do not need to arrange gas chamber.
The medium of cooling high temperature flue gas generally adopts air or water, and the type of cooling comprises: cooling, the indirect water-cooling of spraying, air draught are cooling, indirectly air-cooled.Wherein the shortcoming of four kinds of type of cooling existence is as follows: spray cooling, increased the cohesiveness of humidity of flue gas, corrosivity and flue dust; Indirect water-cooling, water consumption is large; The cooling exhaust gas volumn that increased of air draught, it is large that cleaner becomes; Indirectly air-cooled, no matter be to adopt atmosphere naturally cooling or cooling with axial flow blower ventilation, hot blast all needs to diffuse.
But, known from prior art, in current dry-method bag-type dedusting, almost effectively do not use the waste heat of high-temperature flue gas.
Summary of the invention
In order to address the above problem, the utility model provides a kind of iron alloy electric furnace flue gas waste heat utilization device, and the waste heat that it can effectively utilize high-temperature flue gas reaches the object of energy-saving and emission-reduction.
In order to achieve the above object, the utility model provides a kind of iron alloy electric furnace flue gas waste heat utilization device, comprises electric furnace, and electric furnace is provided with flue; Also comprise heat exchanger, heat exchanger includes First Heat Exchanger, the second heat exchanger and the 3rd heat exchanger, and three heat exchangers are connected in the flue of electric furnace successively; Between First Heat Exchanger and the second heat exchanger, be provided with thick dust arrester; The outer setting of First Heat Exchanger and the second heat exchanger has centrifugal blower; Between the second heat exchanger and the 3rd heat exchanger, be provided with bag-type dust collector.
Preferably, the gas chamber that can collect carbon monoxide in airtight iron alloy electric furnace flue gas is set after the 3rd heat exchanger.
Preferably, between First Heat Exchanger, the second heat exchanger and the 3rd heat exchanger and the flue of electric furnace, by flange, be connected.
Preferably, heat exchanger is shell-and-tube, the heat-insulation layer of the useful insulation material wrapping of outer setting of heat exchanger, one end of heat exchanger is that flue gas flows into end, the other end is flue gas outflow end, heat exchanger arranged outside has two external agency pipelines, near the pipeline of flue gas upstream end, is wherein external agency flow ipe, near the pipeline of flue gas outflow end, is that external agency flows out pipeline.
Preferably, flue gas flows on the front flue of end and is provided with thermocouple temperature measurement instrument and manometer; On flue after flue gas outflow end, be provided with thermocouple temperature measurement instrument and manometer, on the pipeline before external agency flow ipe, be provided with valve, flowmeter, thermocouple temperature measurement instrument, manometer; External agency flows out on the pipeline after pipeline and is provided with thermocouple temperature measurement instrument, manometer.
Preferably, described valve is automatic regulating butterfly valve.
Preferably, the inside of heat exchanger is provided with seamless steel pipe.
Preferably, the flue gas upstream end before First Heat Exchanger and before the second heat exchanger is provided with purging ash handling equipment.
Preferably, when heat exchanger is First Heat Exchanger and the second heat exchanger, the ducted medium of external agency is air.
Preferably, when heat exchanger is the 3rd heat exchanger, the ducted medium of external agency is water.
The advantage that in the utility model, iron alloy electric furnace flue gas waste heat utilization device has compared to prior art is:
(1) hot blast that First Heat Exchanger produces is directly used in combustion-supporting, has not only saved the required combustion fan equipment of sintering, rotary hearth furnace or rotary kiln, and can improve furnace temperature, assurance output, can also save fuel consumption more than 15% simultaneously;
(2) hot blast that First Heat Exchanger produces can also be used for electric preheating furnace raw material, thereby reduces melting electric consumption;
The hot blast that (3) second heat exchangers produce replaces gas-fired to be used for drying ore, carbon raw material, has saved the consumption of secondary energy sources;
The hot blast that (4) second heat exchangers produce can be used for the anti-freezing and heat-insulating of raw material plant, ensures produce smooth;
Domestic hot-water, low-pressure steam that (5) the 3rd heat exchangers provide do not need additionally to consume the energy.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the dry fume dust arrester of ferroalloy closed electric furnace in prior art;
Fig. 2 is the schematic flow sheet of ferroalloy closed electric furnace flue gas waste heat utilization device in the utility model;
Fig. 3 is ferroalloy semi-hermetic in the utility model/uncovered electric furnace flue gas residual heat using device schematic flow sheet;
Fig. 4 is the schematic diagram that in the utility model, heat exchanger is connected with flue;
Fig. 5 is the cutaway view of A-A in Fig. 4.
The specific embodiment
Below, by exemplary embodiment, the utility model is specifically described.But should be appreciated that element, structure and the feature in an embodiment also can be attached in other embodiments valuably in the situation that further not narrating.
Referring to Fig. 2, it is the schematic flow sheet of ferroalloy closed electric furnace flue gas waste heat utilization device in the utility model.As shown in Figure 2, this iron alloy electric furnace flue gas waste heat utilization device comprises electric furnace 1, electric furnace 1 is provided with flue 11, also include heat exchanger 20, heat exchanger 20 comprises First Heat Exchanger 21, the second heat exchanger 22 and the 3rd heat exchanger 23, three heat exchangers are connected in the flue of electric furnace successively, and the connected mode between heat exchanger 20 and flue 11 is preferably flange 12 and is connected, the outer setting of First Heat Exchanger 21 and the second heat exchanger 22 has centrifugal blower 40, for blasting air to heat exchanger, wherein between First Heat Exchanger 21 and the second heat exchanger 22, be provided with thick dust arrester 30, between the second heat exchanger 22 and the 3rd heat exchanger 23, be provided with bag-type dust collector 50, after the 3rd heat exchanger 23, be provided with the gas chamber 60 that can collect carbon monoxide in airtight iron alloy electric furnace flue gas, the technical process of utilizing specific to iron alloy electric furnace fume afterheat is as follows: the high-temperature flue gas that electric furnace 1 produces is through First Heat Exchanger 21 heat exchange, make flue-gas temperature be reduced to 500-300 ℃, when breaking down, the flue gas of electric furnace 1 is not by First Heat Exchanger 21, directly by the diffusion valve 10 on electric furnace 1, diffused in air, First Heat Exchanger 21 with high-temperature flue gas heat exchange after produce high-pressure hot wind, hot blast is as combustion-supporting medium for the pretreated combustion heat supplying of ferroalloy technique Raw, hot blast can also be used for the raw material of preheating iron alloy electric furnace, from First Heat Exchanger 21, flue gas out carries out entering into the second heat exchanger 22 after thick dedusting through thick dust arrester 30, through the heat exchange of the second heat exchanger 22, make the temperature of flue gas be down to 200-220 ℃, the high-pressure hot wind that the second heat exchanger 22 produces simultaneously can be used for the oven dry of ferroalloy raw material and the anti-freezing and heat-insulating of raw material plant, from the second heat exchanger 22 flue gas out, through bag-type dust collector 50, carry out further udst separation, reclaim qualified flue gas through the 3rd heat exchanger 23, now the temperature of flue gas is down to 50-60 ℃, from the 3rd heat exchanger 23 flue gas out, being fed to gas chamber 60 stores, in heat exchange, the 3rd heat exchanger 23 produces hot water, defective when flue gas out in the 3rd heat exchanger 23,, when the carbon monoxide in flue gas content reclaiming is on the low side or oxygen concentration is higher, can direct-fire diffuse.
As shown in Figure 3, be ferroalloy semi-hermetic in the utility model/uncovered electric furnace flue gas residual heat using device schematic flow sheet.When this application of installation is in semiclosed and uncovered iron alloy electric furnace, the difference of itself and above-mentioned airtight electric furnace flue gas residual heat using device is, after the 3rd heat exchanger 23, be not provided with gas chamber 60, because semi-hermetic/uncovered electric furnace does not need to arrange the recovery of carbon monoxide.
Referring to Fig. 4 and Fig. 5, it is the schematic diagram that in the utility model, heat exchanger is connected with flue.As shown in the figure, heat exchanger 20 is shell-and-tube, the heat-insulation layer of the useful insulation material wrapping of outer setting of heat exchanger 20, and one end of heat exchanger 20 is that flue gas flows into end 201, and the other end is flue gas outflow end 203, and heat exchanger 20 is connected in flue 11, the pipe portion outer upper end of heat exchanger 20 is provided with two external agency pipelines, for inflow and the outflow of for example air of external agency or water, near the pipeline of flue gas upstream end 201, be wherein external agency flow ipe 202, in outside MEDIA FLOW, enter pipeline 202 ends and be provided with valve and flowmeter, valve is herein preferably automatic regulating butterfly valve, when electric furnace flue gas amount fluctuates, by regulating the valve before heat exchanger 20 to control the air quantity or the water yield that enter heat exchanger 20, thereby control out the flue-gas temperature of heat exchanger 20 ,near the pipeline of flue gas outflow end 203, be that external agency flows out pipeline 204, between flue 11 and heat exchanger 20, adopt flange 12 to be connected, for the temperature of flue gas and external agency in real-time detection turnover heat exchanger, flue gas at heat exchanger 20 flows into end 201, flue gas outflow end 203 and external agency flow ipe 202, external agency flows out on pipeline 204 and is provided with thermocouple temperature measurement instrument, for the pressure of flue gas and external agency in real-time detection turnover heat exchanger, flue gas at heat exchanger 20 flows into end 201, flue gas outflow end 203 and external agency flow ipe 202, external agency flows out on pipeline 204 and is provided with manometer, in addition, in order to make heat exchanger 20 can bear washing away of high-temperature flue gas and corrode, in the inside of heat exchanger 20, be provided with seamless steel pipe 7.
Because First Heat Exchanger 21 and the second heat exchanger 22 adopt centrifugal blower 40 to air-blowing in heat exchanger, its operation principle is: at First Heat Exchanger 21 and the second heat exchanger 22 outer setting centrifugal blowers 40, above-mentioned external agency is air, centrifugal blower 40 blasts pressure-air in First Heat Exchanger 21 and the second heat exchanger 22, air is in First Heat Exchanger 21 and the second heat exchanger 22 flows outside, flue gas is in the internal flow of First Heat Exchanger 21 and the second heat exchanger 22, by forced convection heat transfer, flue gas be cooled temperature decline, the heated temperature of air raises, before flue gas upstream end heat exchanger, be also provided with purging ash handling equipment, blowing medium is inert gas, when fume side resistance is excessive, just can open blow device and carry out ash disposal, when electric furnace flue gas amount and temperature fluctuation, by regulating the valve of air header before the frequency of centrifugal blower or heat exchanger, control the air quantity that enters heat exchanger, thereby control out the flue-gas temperature of heat exchanger.
In the 3rd heat exchanger 23, its external agency is water, its concrete operation principle is: pass through convection heat transfer' heat-transfer by convection, flue gas is cooled, water is heated, when electric furnace flue gas amount fluctuates, by the valve of supply mains before adjusting heat exchanger, control the water yield that enters heat exchanger, thereby control out heat exchanger flue-gas temperature.
Below in conjunction with specific embodiment, above-mentioned electric furnace flue gas residual heat using device is elaborated:
The first embodiment: adopt rotary hearth furnace or rotary kiln prereduction method to produce high carbon ferro-chrome, exhaust gas volumn 550~700Nm that iron alloy electric furnace product per ton produces 3, concentration~80% of CO, 600~800 ℃ of flue-gas temperatures.
First high-temperature flue gas passes through First Heat Exchanger, and flue gas temperature drop is to~450 ℃, and air themperature rises to~and 350 ℃; Flue gas is through gravitational dust collection subsequently; Then flue gas is through the second heat exchanger, and temperature drops to 200~220 ℃, and air themperature rises to~and 200 ℃; Flue gas enters sack cleaner udst separation afterwards; Reclaim qualified flue gas through the 3rd heat exchanger, flue-gas temperature drops to 50~60 ℃, and hot water temperature is higher than 60 ℃, and flue gas enters gas chamber storage afterwards; When the coal gas CO content reclaiming is on the low side or O 2when concentration is higher, can direct-fire diffuse.
The hot blast that above-mentioned First Heat Exchanger produces, blast is 3~8kPa, and this part hot blast is transported to rotary hearth furnace by utilidor or rotary kiln participates in combustion heat supplying as combustion-supporting medium, and this has not only improved furnace temperature, has also saved the coal gas that chromite prereduction consumes.
The hot blast that above-mentioned the second heat exchanger produces, blast is about 3kPa, this part hot blast is transported to raw material plant by utilidor, for the anti-freezing and heat-insulating of the dry and raw material plant of chromite, carbon raw material.Chromite and carbon raw material adopt rotary drying machine to dry conventionally, and the heat carrier of dryer is the flue gas that the burning of electric furnace gas recovery produces.The utility model adopts the heat carrier of hot blast as dryer, can save gas consumption.
The hot water that above-mentioned the 3rd heat exchanger produces, hydraulic pressure is 0.4~0.6MPa, can be used for providing domestic hot-water.
The second embodiment: adopt sintering process to produce high carbon ferromanganese, the exhaust gas volumn that iron alloy electric furnace product per ton produces is 990N m 3left and right, the concentration of CO is 72% left and right, flue-gas temperature is 500~700 ℃.
First high-temperature flue gas passes through First Heat Exchanger, flue gas temperature drop to 400 ℃ left and right, and air themperature rises to 350 ℃ of left and right; Then flue gas is through cyclone dust removal; Flue gas is through the second heat exchanger afterwards, and flue-gas temperature drops to 200~220 ℃, and air themperature rises to 200 ℃; Flue gas enters sack cleaner udst separation afterwards; Reclaim qualified flue gas through the 3rd heat exchanger, flue-gas temperature drops to 50~60 ℃, and hot water temperature is higher than 60 ℃, and flue gas enters gas chamber storage afterwards; When the content of CO in smoke reclaiming is on the low side or O 2when concentration is higher, can direct-fire diffuse.
The hot blast that above-mentioned First Heat Exchanger produces, blast is 5kPa left and right, hot blast is transported to sintering by a utilidor part and participates in combustion heat supplying as combustion-supporting medium, and a part is transported to preheating kiln and comes as heat carrier the raw material of electric preheating furnace in addition, and preheating kiln top is provided with cleaner.Raw material preheating temperature is greater than 300 ℃, enters electric furnace afterwards smelt by insulation material pipe.
The hot blast that above-mentioned the second heat exchanger produces, blast is about 3kPa, this part hot blast is transported to raw material plant by utilidor, for the anti-freezing and heat-insulating of the dry and raw material plant of carbon raw material.Carbon raw material adopts rotary drying machine to dry conventionally, and the heat carrier of dryer is the flue gas that the burning of electric furnace gas recovery produces, and the utility model adopts the heat carrier of hot blast as dryer, can save gas consumption.
The hot water that above-mentioned the 3rd heat exchanger produces, hydraulic pressure is 0.6MPa left and right, for domestic hot-water is provided.
Be appreciated that the utility model is described by some embodiment, those skilled in the art know, in the situation that not departing from spirit and scope of the present utility model, can carry out various changes or equivalence replacement to these features and embodiment.In addition, under instruction of the present utility model, can modify to adapt to concrete situation and material and can not depart from spirit and scope of the present utility model these features and embodiment.Therefore, the utility model is not subject to the restriction of specific embodiment disclosed herein, and the embodiment within the scope of all the application's of falling into claim belongs in the scope that the utility model protects.

Claims (10)

1. an iron alloy electric furnace flue gas waste heat utilization device, comprising: electric furnace (1), is provided with flue (11) on electric furnace (1); Also comprise heat exchanger (20), it is characterized in that, heat exchanger (20) includes First Heat Exchanger (21), the second heat exchanger (22) and the 3rd heat exchanger (23), and three heat exchangers are connected in the flue (11) of electric furnace (1) successively; Between First Heat Exchanger (21) and the second heat exchanger (22), be provided with thick dust arrester (30); The outer setting of First Heat Exchanger (21) and the second heat exchanger (22) has centrifugal blower (40); Between the second heat exchanger (22) and the 3rd heat exchanger (23), be provided with bag-type dust collector (50).
2. iron alloy electric furnace flue gas waste heat utilization device according to claim 1, is characterized in that, the 3rd heat exchanger (23) arranges the gas chamber (60) that can collect carbon monoxide in airtight iron alloy electric furnace flue gas afterwards.
3. iron alloy electric furnace flue gas waste heat utilization device according to claim 1, it is characterized in that, between First Heat Exchanger (21), the second heat exchanger (22) and the 3rd heat exchanger (23) and the flue (11) of electric furnace (1), by flange (12), be connected.
4. iron alloy electric furnace flue gas waste heat utilization device according to claim 1 and 2, it is characterized in that, heat exchanger (20) is shell-and-tube, the heat-insulation layer of the useful insulation material wrapping of outer setting of heat exchanger (20), one end of heat exchanger (20) is that flue gas flows into end (201), the other end is flue gas outflow end (203), the pipe portion outer upper end of heat exchanger (20) is provided with two external agency pipelines, near the pipeline of flue gas upstream end (201), be wherein external agency flow ipe (202), near the pipeline of flue gas outflow end (203), be that external agency flows out pipeline (204).
5. iron alloy electric furnace flue gas waste heat utilization device according to claim 4, is characterized in that, flue gas flows on end (201) front flue and is provided with thermocouple temperature measurement instrument and manometer; On flue after flue gas outflow end (203), be provided with thermocouple temperature measurement instrument and manometer, on the front pipeline of external agency flow ipe (202), be provided with valve, flowmeter, thermocouple temperature measurement instrument, manometer; External agency flows out on the pipeline after pipeline (204) and is provided with thermocouple temperature measurement instrument, manometer.
6. iron alloy electric furnace flue gas waste heat utilization device according to claim 5, is characterized in that, described valve is automatic regulating butterfly valve.
7. iron alloy electric furnace flue gas waste heat utilization device according to claim 4, is characterized in that, the inside of heat exchanger (20) is provided with seamless steel pipe (7).
8. iron alloy electric furnace flue gas waste heat utilization device according to claim 4, is characterized in that, First Heat Exchanger (21) flue gas upstream end front and that the second heat exchanger (22) is front is provided with purging ash handling equipment.
9. iron alloy electric furnace flue gas waste heat utilization device according to claim 4, is characterized in that, when heat exchanger (20) is First Heat Exchanger (21) and the second heat exchanger (22), the ducted medium of external agency is air.
10. iron alloy electric furnace flue gas waste heat utilization device according to claim 4, is characterized in that, when heat exchanger (20) is the 3rd heat exchanger (23), the ducted medium of external agency is water.
CN201320722924.3U 2013-11-13 2013-11-13 Smoke waste heat utilizing device of ferroalloy electric furnace Expired - Fee Related CN203550636U (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103983119A (en) * 2014-05-04 2014-08-13 遵义市贵科科技有限公司 Flue gas waste heat utilization method for coal-to-gas perlite expansion furnace
CN112933830A (en) * 2021-01-30 2021-06-11 成都易态科技有限公司 Heat exchange dust removal structure, heat exchange dust removal device and high-temperature dust-containing gas treatment method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103983119A (en) * 2014-05-04 2014-08-13 遵义市贵科科技有限公司 Flue gas waste heat utilization method for coal-to-gas perlite expansion furnace
CN103983119B (en) * 2014-05-04 2015-07-29 遵义市贵科科技有限公司 A kind of coal gas furnace for expanding perlite fume afterheat Application way
CN112933830A (en) * 2021-01-30 2021-06-11 成都易态科技有限公司 Heat exchange dust removal structure, heat exchange dust removal device and high-temperature dust-containing gas treatment method

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Granted publication date: 20140416

Termination date: 20171113