CN111878998A - Method for efficiently reducing slagging of heating surface of heat exchanger of biomass hot blast stove - Google Patents
Method for efficiently reducing slagging of heating surface of heat exchanger of biomass hot blast stove Download PDFInfo
- Publication number
- CN111878998A CN111878998A CN202010786990.1A CN202010786990A CN111878998A CN 111878998 A CN111878998 A CN 111878998A CN 202010786990 A CN202010786990 A CN 202010786990A CN 111878998 A CN111878998 A CN 111878998A
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- China
- Prior art keywords
- heat exchanger
- medium
- heat exchange
- blast stove
- flue gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002028 Biomass Substances 0.000 title claims abstract description 39
- 238000010438 heat treatment Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000002893 slag Substances 0.000 claims abstract description 62
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000003546 flue gas Substances 0.000 claims abstract description 48
- 239000011295 pitch Substances 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 239000002956 ash Substances 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010903 husk Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 239000010902 straw Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/008—Air heaters using solid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0052—Details for air heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
- F24H9/1877—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/189—Arrangement or mounting of combustion heating means, e.g. grates or burners using solid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for efficiently reducing the slag bonding on the heating surface of a heat exchanger of a biomass hot blast stove, which is characterized in that a slag condenser is additionally arranged between the biomass hot blast stove and the heat exchanger, so that an original settling chamber is cancelled, and the effect of efficiently reducing or completely avoiding the slag bonding on the heating surface of the heat exchanger of the biomass hot blast stove is achieved; the heating surface of the heat exchanger is not subjected to slagging, so that the heat exchange efficiency is improved; the invention is simple and practical, is convenient to clean and adjust, has low investment cost and long service life; the high-temperature flue gas and the medium passing through the slag condenser can be both utilized by a prime power device without adding any power device, so that the investment cost and the use cost are not increased; the problem of slag bonding on the heating surface of the heat exchanger can be effectively reduced, and the heat efficiency of a heat exchange system can be improved.
Description
Technical Field
The invention discloses a method for efficiently reducing slagging on a heating surface of a heat exchanger of a biomass hot blast stove, which can efficiently reduce the slagging problem on the heating surface of the heat exchanger and improve the heat efficiency of a heat exchange system; belongs to the technical field of biomass fuel hot blast stoves.
Background
In the field of biomass hot blast stoves, a heat exchanger is used as long as high-temperature flue gas is not directly utilized, and other media (air, water, oil and the like) are heated to a required temperature by the high-temperature flue gas through the heat exchanger; in order to improve the heat exchange coefficient of the heat exchanger and reduce the occupied area, the pipe diameter of a heat exchange pipe of the biomass fuel hot-blast stove is generally very small and usually cannot exceed phi 50, and the transverse pitch and the longitudinal pitch are generally not more than 2 times of the pipe diameter, so that when biomass fuel which is easy to slag is combusted, the heat exchange pipe of the first flow can block the whole pipeline due to slag bonding no matter how many the pitches among the pipes are when flue gas flows in the pipe; when the flue gas goes outside the pipe, the heat exchange pipes in the first flow can be hung on the wall to form bridges due to small pitches among the pipes, so that the whole flue is blocked; particularly, when biomass fuels which are easy to form slag such as straws and rice husks are used, the heating surface of the heat exchanger usually cannot block a flue due to slag formation for more than 15 days, so that heat exchange is influenced, the production cost is increased, the heat exchanger is forced to be shut down for cleaning due to the fact that the circulation of flue gas is blocked, and continuous and stable production is seriously influenced.
Disclosure of Invention
The invention provides a method for efficiently reducing slagging on a heating surface of a heat exchanger of a biomass hot blast stove, which is characterized in that a slag condenser, namely an original settling chamber, is additionally arranged between the biomass hot blast stove and the heat exchanger, high-temperature flue gas in the slag condenser goes away from a shell pass (outside a pipe) and a medium goes away from a pipe pass (inside the pipe), and the heated heat medium is led back to a cold medium inlet of the heat exchanger; the problem of traditional living beings hot-blast furnace heat exchanger heating surface slagging scorification is solved.
The invention relates to a method for efficiently reducing slagging on a heating surface of a heat exchanger of a biomass hot blast stove, which adopts the following technical scheme:
comprises a biomass hot-blast stove, a heat exchanger, a slag condenser and a medium mixing chamber; wherein the content of the first and second substances,
the slag condenser is connected in series between the biomass hot blast stove and the heat exchanger, and carries out heat exchange on high-temperature flue gas flowing out of the biomass hot blast stove and medium in the slag condenser to form heat exchange medium and heat exchange flue gas:
the heat exchange flue gas enters the heat exchanger for heat exchange again and then is output;
and the heat exchange medium is mixed with the introduced cold medium through the medium mixing chamber, enters the heat exchanger for heat exchange again and is output.
The system for realizing the method for efficiently reducing the slagging on the heating surface of the heat exchanger of the biomass hot blast stove is characterized in that: mainly comprises a biomass hot-blast stove, a heat exchanger, a slag condenser and a medium mixing chamber;
the slag condenser is a sealed container and is connected in series between the biomass hot blast stove and the heat exchanger through a high-temperature flue gas inlet and a high-temperature flue gas outlet at two ends to form a high-temperature flue gas channel outside the heat exchange tube bundle;
a heat exchange tube bundle is also arranged in the slag condenser, and a medium inlet and a medium outlet are arranged at the two ends of the heat exchange tube bundle to form a heat exchange medium channel in the tube;
and a medium mixing chamber is arranged at a cold medium inlet of the heat exchanger and is respectively connected with a hot medium outlet of the slag condenser and a cold medium inlet of the heat exchanger, the hot medium subjected to heat exchange by the slag condenser and the cold medium entering from the cold medium inlet of the heat exchanger are mixed and then enter the heat exchanger, and the mixed hot medium is output through the hot medium outlet of the heat exchanger.
A flue bypass and a bypass valve are also bridged at the two ends of the high-temperature flue gas inlet and the high-temperature flue gas outlet of the slag condenser; when the flue of the slag condenser is blocked, the bypass valve is opened to enable high-temperature flue gas generated by the biomass hot blast stove to directly enter the heat exchanger from the flue bypass.
The invention has the positive effects that:
according to the invention, the slag condenser is additionally arranged between the biomass hot blast stove and the heat exchanger, so that an original settling chamber is cancelled, and the effect of efficiently reducing or completely avoiding slag formation on the heating surface of the heat exchanger of the biomass hot blast stove is achieved; the heating surface of the heat exchanger is not subjected to slagging, so that the heat exchange efficiency is improved; the invention is simple and practical, is convenient to clean and adjust, has low investment cost and long service life; the high-temperature flue gas and the medium passing through the slag condenser are both utilized by a prime power device without adding any power device, so that the investment cost and the use cost are not increased.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a structural diagram of a slag condenser according to the present invention;
in the figure, 1, a biomass hot blast stove; 2. a high temperature flue gas inlet; 3. a slag condenser; 4. a cold medium inlet; 5. a high-temperature flue gas outlet; 6. a heat exchanger heat medium outlet; 7. a heat exchanger; 8. a media mixing chamber; 9. a thermal medium outlet; 10. a flow regulating valve; 11. a manhole door; 12. an ash discharge valve; 13. a flue bypass; 14. a bypass valve; 15. a heat exchanger cold medium inlet; 16. a heat exchange tube bundle; 17. an ash bucket.
Detailed Description
The present invention is further illustrated by the following examples, which do not limit the present invention in any way, and any modifications or changes that can be easily made by a person skilled in the art to the present invention will fall within the scope of the claims of the present invention without departing from the technical solution of the present invention.
Example 1
As shown in fig. 1, the invention mainly comprises a biomass hot blast stove 1, a high-temperature flue gas inlet 2, a slag condenser 3, a cold medium inlet 4, a high-temperature flue gas outlet 5, a heat medium outlet 6 of a heat exchanger, a heat exchanger 7, a medium mixing chamber 8, a hot medium outlet 9, a flow regulating valve 10, a manhole door 11, an ash discharge valve 12, a flue bypass 13, a bypass valve 14, a heat exchanger cold medium inlet 15, a heat exchange tube bundle 16, an ash hopper 17 and the like;
referring to fig. 2, the slag condenser 3 is a sealed container, and both ends of the slag condenser are respectively provided with a high-temperature flue gas inlet 2 and a high-temperature flue gas outlet 5, and the slag condenser is connected in series between a biomass hot blast stove 1 and a heat exchanger 7 to form a high-temperature flue gas channel outside a heat exchange tube bundle 16; a heat exchange tube bundle 16 is also arranged in the slag condenser 3, and two ends of the heat exchange tube bundle 16 are provided with a cold medium inlet 4 and a hot medium outlet 9 to form a heat exchange medium channel in the tube; the heat exchange tube bundles 16 are arranged in a matrix form, and can be arranged in a row or in a staggered manner; the pitches between the transverse pipe and the longitudinal pipe are 3-5 times of the pipe diameter; the flow of the flue gas in the slag condenser 3 is prolonged as far as possible, namely a plurality of flue gas flows can be set, so that the molten fly ash in the flue gas is left in the slag condenser 3 as much as possible;
the quantity of the heat exchange tubes in the slag condenser 3 is preferably lower than 650 ℃, so that the problem of slag bonding on the heating surface of the heat exchanger 7 can be completely avoided.
The material of the heat exchange tube in the slag condenser 3 is selected according to the temperature of the inlet flue gas, and can be mixed and matched; the shell and the flue of the slag condenser 3 are both made of high-temperature resistant casting materials with carbon steel plate linings.
And manhole doors 11 are respectively arranged at the positions of the high-temperature flue gas inlet 2 and the high-temperature flue gas outlet 5 of the slag condenser 3, and an ash bucket 17 and an ash discharge valve 12 are also arranged at the bottom of the slag condenser 3, so that the slag can conveniently enter the slag condenser 3 after the furnace is stopped to clean the coke slag outside the heat exchange pipe.
High-temperature flue gas generated by the biomass hot blast stove 1 enters the slag condenser 3 through the high-temperature flue gas inlet 2, exchanges heat with a medium in the heat exchange tube and then enters the heat exchanger 7 through the high-temperature flue gas outlet 5.
A flue bypass 13 and a bypass valve 14 are also bridged at the two ends of the high-temperature flue gas inlet 2 and the high-temperature flue gas outlet 5 of the slag condenser 3; when the flue of the slag condenser 3 is blocked, the bypass valve 14 is opened to enable high-temperature flue gas generated by the biomass hot blast stove 1 to directly enter the heat exchanger 7 from the flue bypass 13, so that certain working time can be prolonged.
Connect the hot medium export 9 of slag condenser 3 to medium mixing chamber 8, make the medium that slag condenser 3 heated mix with the cold medium who gets into from heat exchanger cold medium entry 15 and get into heat exchanger 7 together, improved the temperature of the cold medium of whole quantity, increased the heat transfer area of heat exchanger 7 equivalently, can not influence required medium temperature because of the reduction of slag condenser 3 export flue gas temperature.
A flow regulating valve 10 is arranged at an outlet 9 of a hot medium of the slag condenser 3 or an inlet 4 of a cold medium of the slag condenser, and the flow of the medium can be regulated at will according to actual use conditions, so that the regulation is convenient.
The following tests show that when the biomass fuel easy to slag is combusted, such as straw, rice husk and the like, the flue gas temperature and the continuous working days of the heat exchanger are compared and analyzed by the following table:
| serial number | Temperature of flue gas | Number of continuous working days of heat exchanger |
| 1 | >900 |
5 to 7 |
| 2 | 800~900 |
10 |
| 3 | 700~800 |
15 to 20 days |
| 4 | 650~700℃ | 70-80 |
| 5 | <650℃ | Long term |
And (4) conclusion: the method of the invention achieves the effect of efficiently reducing or completely avoiding the slag bonding of the heating surface of the heat exchanger of the biomass hot blast stove; the heating surface of the heat exchanger is not slagging, the continuous working days of the heat exchanger are prolonged, and the heat exchange efficiency is improved.
Claims (4)
1. A method for efficiently reducing slagging on a heating surface of a heat exchanger of a biomass hot blast stove is characterized by comprising the following steps: comprises a biomass hot-blast stove, a heat exchanger, a slag condenser and a medium mixing chamber; wherein the content of the first and second substances,
the slag condenser is connected in series between the biomass hot blast stove and the heat exchanger, and carries out heat exchange on high-temperature flue gas flowing out of the biomass hot blast stove and medium in the slag condenser to form heat exchange medium and heat exchange flue gas:
the heat exchange flue gas enters the heat exchanger for heat exchange again and then is output;
and the heat exchange medium is mixed with the introduced cold medium through the medium mixing chamber, enters the heat exchanger for heat exchange again and is output.
2. The utility model provides a device of high-efficient living beings hot-blast furnace heat exchanger heating surface slagging scorification that alleviates which characterized in that: mainly comprises a biomass hot-blast stove, a heat exchanger, a slag condenser and a medium mixing chamber;
the slag condenser is a sealed container and is connected in series between the biomass hot blast stove and the heat exchanger through a high-temperature flue gas inlet and a high-temperature flue gas outlet at two ends to form a high-temperature flue gas channel outside the heat exchange tube bundle;
a heat exchange tube bundle is also arranged in the slag condenser, and a medium inlet and a medium outlet are arranged at the two ends of the heat exchange tube bundle to form a heat exchange medium channel in the tube;
and a medium mixing chamber is arranged at a cold medium inlet of the heat exchanger and is respectively connected with a hot medium outlet of the slag condenser and a cold medium inlet of the heat exchanger, the hot medium subjected to heat exchange by the slag condenser and the cold medium entering from the cold medium inlet of the heat exchanger are mixed and then enter the heat exchanger, and the mixed hot medium is output through the hot medium outlet of the heat exchanger.
3. The device for efficiently reducing the slagging of the heating surface of the heat exchanger of the biomass hot blast stove according to claim 1, is characterized in that:
the heat exchange tube bundles are arranged in a matrix form, can be arranged in a row or in a staggered manner; the pitches between the transverse pipe and the longitudinal pipe are 3-5 times of the pipe diameter.
4. The device for efficiently reducing the slagging of the heating surface of the heat exchanger of the biomass hot blast stove according to claim 1, is characterized in that:
a flue bypass and a bypass valve are also bridged at the two ends of the high-temperature flue gas inlet and the high-temperature flue gas outlet of the slag condenser; when the flue of the slag condenser is blocked, the bypass valve is opened to enable high-temperature flue gas generated by the biomass hot blast stove to directly enter the heat exchanger from the flue bypass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010786990.1A CN111878998A (en) | 2020-08-07 | 2020-08-07 | Method for efficiently reducing slagging of heating surface of heat exchanger of biomass hot blast stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010786990.1A CN111878998A (en) | 2020-08-07 | 2020-08-07 | Method for efficiently reducing slagging of heating surface of heat exchanger of biomass hot blast stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111878998A true CN111878998A (en) | 2020-11-03 |
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ID=73210998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010786990.1A Pending CN111878998A (en) | 2020-08-07 | 2020-08-07 | Method for efficiently reducing slagging of heating surface of heat exchanger of biomass hot blast stove |
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| Country | Link |
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| CN (1) | CN111878998A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980065145A (en) * | 1998-06-26 | 1998-10-07 | 이실근 | Combined heat exchanger and method for waste heat recovery. |
| JP2004205115A (en) * | 2002-12-25 | 2004-07-22 | Mie Chuo Kaihatsu Kk | Device for preventing clinker deposition on furnace wall of incinerator |
| CN107843131A (en) * | 2017-11-02 | 2018-03-27 | 北京科技大学 | High-temperature dust-containing flue gas exhaust heat recovering method and device with molten dirt self-cleaning function |
| CN111207387A (en) * | 2020-01-16 | 2020-05-29 | 吉林宏日新能源股份有限公司 | Biomass fuel hot blast stove |
| CN212537879U (en) * | 2020-08-07 | 2021-02-12 | 吉林省守庆能源有限公司 | Device for efficiently reducing slagging of heating surface of heat exchanger of biomass hot blast stove |
-
2020
- 2020-08-07 CN CN202010786990.1A patent/CN111878998A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980065145A (en) * | 1998-06-26 | 1998-10-07 | 이실근 | Combined heat exchanger and method for waste heat recovery. |
| JP2004205115A (en) * | 2002-12-25 | 2004-07-22 | Mie Chuo Kaihatsu Kk | Device for preventing clinker deposition on furnace wall of incinerator |
| CN107843131A (en) * | 2017-11-02 | 2018-03-27 | 北京科技大学 | High-temperature dust-containing flue gas exhaust heat recovering method and device with molten dirt self-cleaning function |
| CN111207387A (en) * | 2020-01-16 | 2020-05-29 | 吉林宏日新能源股份有限公司 | Biomass fuel hot blast stove |
| CN212537879U (en) * | 2020-08-07 | 2021-02-12 | 吉林省守庆能源有限公司 | Device for efficiently reducing slagging of heating surface of heat exchanger of biomass hot blast stove |
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