CN112458230A - Converter gas dry dedusting and waste heat recovery system - Google Patents
Converter gas dry dedusting and waste heat recovery system Download PDFInfo
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- CN112458230A CN112458230A CN202011420181.5A CN202011420181A CN112458230A CN 112458230 A CN112458230 A CN 112458230A CN 202011420181 A CN202011420181 A CN 202011420181A CN 112458230 A CN112458230 A CN 112458230A
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- section
- waste heat
- cooling section
- descending
- converter gas
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- 239000007789 gas Substances 0.000 title claims abstract description 42
- 239000002918 waste heat Substances 0.000 title claims abstract description 30
- 238000011084 recovery Methods 0.000 title claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 53
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 230000001174 ascending effect Effects 0.000 claims abstract description 29
- 241000234295 Musa Species 0.000 claims abstract description 17
- 235000018290 Musa x paradisiaca Nutrition 0.000 claims abstract description 16
- 238000001704 evaporation Methods 0.000 claims abstract description 12
- 230000008020 evaporation Effects 0.000 claims abstract description 11
- 238000009991 scouring Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000428 dust Substances 0.000 claims description 25
- 238000010791 quenching Methods 0.000 claims description 13
- 230000000171 quenching effect Effects 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 238000005299 abrasion Methods 0.000 description 7
- 238000009834 vaporization Methods 0.000 description 6
- 230000008016 vaporization Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000007670 refining Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 235000021015 bananas Nutrition 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a converter gas dry dedusting and waste heat recovery system which comprises a descending cooling section, a banana bend dedusting section, an ascending cooling section and a tail waste heat section, wherein the descending cooling section, the banana bend dedusting section and the ascending cooling section are sequentially connected and form U-shaped connection, and the tail waste heat section is connected to the tail end of the ascending cooling section. The descending cooling section is provided with a vertical heated tube or tube panel which forms longitudinal scouring. A vertical evaporation heating pipe forming longitudinal scouring is arranged in the ascending cooling section. The invention has the advantages of saving water, recovering the heat of the converter gas, effectively reducing the water content of the gas and the volume of the gas and the like.
Description
Technical Field
The invention relates to a dry dedusting and waste heat recovery system for converter gas, and belongs to the technical field of comprehensive utilization of converter gas.
Background
A converter steelmaking smelting period comprises an air refining period and a non-air refining period, wherein one smelting period is generally 28-38 min, the air refining period is 14-18 min, and the non-air refining period is 14-20 min. The furnace gas is generated only in the blowing period, and the amount of the furnace gas changes greatly along with the time. These converters have very high gas temperatures, ranging from 1400 ℃ to 1600 ℃ at the converter outlet. And has a large dust content of about 80 to 150g/m3. Meanwhile, the content of CO in the converter gas is often more than 70%.
The current dry dedusting technology for converter gas comprises wet dedusting and dry dedusting. The wet dust removal method has the defects of low dust removal efficiency, large system resistance loss, high operation cost, secondary pollution hidden danger caused by a large amount of sewage generated by dust removal and the like. The dry dedusting system comprises a vaporization cooling flue, a steam generator and electrostatic dedusting, and overcomes the defects of wet dedusting, but has the defects of potential explosion hazard and the like. Meanwhile, the waste heat, especially the converter gas of about 1000 ℃ output by the vaporization cooling flue, cannot be effectively recovered no matter the wet dust removal or the dry dust removal.
Disclosure of Invention
The invention aims to provide a converter gas dry dedusting and waste heat recovery system which can be connected behind a vaporization flue and is used for converter gas dry dedusting and waste heat recovery at the temperature of about 1000 ℃.
The invention is realized by the following technical scheme:
a converter gas dry dedusting and waste heat recovery system comprises a descending cooling section, a banana bend dedusting section and an ascending cooling section which are sequentially connected and form U-shaped connection, and a tail waste heat section connected to the tail end of the ascending cooling section, wherein the descending cooling section is arranged on one side of the U shape, the ascending cooling section is arranged on the other side of the U shape, and the banana bend dedusting section is arranged at the bottom of the U shape; the descending cooling section comprises a descending section shell and a vertical heating assembly arranged in the descending section shell, and converter gas forms longitudinal flow scouring on the vertical heating assembly; the ascending cooling section comprises an ascending section shell and a vertical evaporation heating pipe arranged in the ascending section shell, and converter gas forms longitudinal flow scouring on the vertical evaporation heating pipe; a plurality of countercurrent baffles are arranged in the banana corner dust removal section, and a scraper ash remover is arranged at the bottom of the banana corner dust removal section; the tail waste heat section comprises a tail flue gas channel and a plurality of coal economizers arranged in the tail flue gas channel, and converter gas forms cross flow scouring on the coal economizers.
As an optimized technical scheme, the system further comprises a quenching section arranged in front of the descending cooling section, the quenching section is arranged in a hollow shell mode and is of a membrane water-cooled wall structure, and a plurality of water spray holes are formed in the inlet of the quenching section.
One of the technical schemes is that the descending cooling section is arranged in a cylindrical shape, and the vertical heating assembly is a vertical heating pipe which is distributed.
In the above technical scheme, the vertical heated tube is arranged in a plurality of concentric circles with the central axis of the cylinder as the center of a circle.
In another technical scheme, the descending cooling section is arranged in a square cylinder shape, the shell of the descending section adopts a membrane wall structure, and the vertical heating assembly adopts vertical heating tubes which are distributed in a distributed manner or a vertical tube panel which is arranged in a square surrounding manner.
In the above technical scheme, the tail residual heat section is transversely arranged.
In the technical scheme, the system further comprises a steam drum, and the vertical heating assembly, the evaporation heating surface and the economizer are respectively provided with a header, an ascending pipe and a descending pipe and are respectively connected with the steam drum and the header through the ascending pipe and the descending pipe.
The invention has the following advantages and beneficial effects:
compared with the traditional OG method and LT method, the invention not only has the advantages of saving water and recovering heat, but also solves the problem of difficult wastewater treatment, effectively reduces the water content and the volume of the gas, greatly improves the working conditions of the subsequent dust remover, reduces the load of the dust remover, and is convenient for metal recovery and dust post-utilization. The longitudinal flow structure adopted by the invention is different from the structure in the prior art, and can effectively avoid the abrasion of the heating surface.
Drawings
FIG. 1 is a schematic diagram of a converter gas dry dedusting and waste heat recovery system according to one embodiment of the present invention.
FIG. 2 is a schematic diagram of a converter gas dry dedusting and waste heat recovery system with a quenching section according to the present invention.
Fig. 3 is a schematic view of a descending cooling section of a cylindrical structure according to the present invention.
In the figure: 1-a descending cooling section; 101-a drop leg housing; 102-a refractory material; 103-vertical heated assembly; 2-bending and dedusting section of bananas; 3-ascending cooling section; 4-tail waste heat section; 5-scraper ash discharger; 6-evaporating the heated tube; 7-a quenching section; 8-water spray hole.
Detailed Description
The following describes the embodiments and operation of the present invention with reference to the accompanying drawings.
The terms of orientation such as up, down, left, right, front, and rear in the present specification are established based on the positional relationship shown in the drawings. The corresponding positional relationship may also vary depending on the drawings, and therefore, should not be construed as limiting the scope of protection.
As shown in figure 1, the converter gas dry dedusting and waste heat recovery system comprises a descending cooling section 1, a banana bend dedusting section 2, an ascending cooling section 3 and a tail waste heat section 4 which are sequentially connected and form U-shaped connection. Descending cooling section 1 sets up in the left side of U-shaped, and ascending cooling section 3 sets up in the right side of U-shaped, and the curved dust removal section 2 of banana sets up in the U-shaped bottom, and this kind of structure makes descending cooling section 1, the curved dust removal section 2 of banana, ascending cooling section 3 between form the U-shaped separator. The converter gas from the converter outlet is cooled through the vaporization flue, and is usually cooled to about 1000 ℃. The inlet of the descending cooling section 1 can be connected with the outlet of the vaporization flue.
As an optimized technical scheme, a quenching section 7 is arranged in front of the descending cooling section 1, and a plurality of water spray holes 8 are arranged at the inlet of the quenching section and used for water spray quenching in case of accidents. The quenching section is arranged in a hollow shell mode, and the wall surface of the quenching section is of a membrane type water-cooled wall structure.
The descending cooling section 1 comprises a descending section shell and a vertical heating assembly arranged in the descending section shell, and converter gas forms longitudinal flow scouring on the vertical heating assembly.
One technical scheme is that the descending cooling section 1 is arranged in a cylindrical shape, a steel cylinder can be selected as the descending section shell 101, and at the moment, refractory materials 102 are built on the inner wall surface of the steel cylinder to prevent high-concentration dust particles from being scoured and abraded. The descending shell 101 can also directly adopt a cylindrical membrane wall structure in sealing connection, and has heat exchange and cooling effects. In the cylindrical descending cooling section, the vertical heating assembly is a vertical heating pipe which is distributed. As a preferred embodiment, as shown in fig. 3, the vertical heated tube is arranged in concentric circles around the center axis of the steel cylinder in the steel cylinder as the outer sealing wall and the refractory 102 arranged on the inner wall surface of the steel cylinder.
The other technical scheme is that the descending cooling section 1 is in a square barrel shape, the descending section shell is of a membrane selection type water-cooled wall structure, the sealing performance is good, and meanwhile, the heat exchange cooling effect is achieved. At the moment, the vertical heating component adopts the vertical heating tubes which are distributed or the vertical tube panels which are arranged in a square surrounding manner. Generally speaking, a tube bank or a tube panel arranged from bottom to top is selected and arranged in a sectional manner according to requirements, and the upper section and the lower section are connected through a header or are respectively connected with a steam drum through an ascending pipe/a descending pipe. The windward side of the anti-abrasion device is provided with an anti-abrasion cover plate to protect the pipe from abrasion.
A plurality of vertical evaporation heating pipes 6 which are distributed in a dispersed way are arranged in the ascending cooling section 3, and the converter gas forms longitudinal scouring on the evaporation heating pipes. And according to the requirement, the evaporation heating pipes can be arranged in a sectional mode, and the upper section and the lower section are connected through a header or are respectively connected with a steam drum through an ascending pipe/a descending pipe. The windward side of the anti-abrasion device is provided with an anti-abrasion cover plate to protect the pipe from abrasion.
The banana bend dust removal section 2 is arranged at the bottom of the descending cooling section 1 and the ascending cooling section 3, the wall surface adopts a membrane wall structure, a plurality of counter-flow baffles are arranged in the membrane wall structure, the counter-flow baffles are usually 3-5, the counter-flow baffles and the flow direction of converter gas are arranged in a counter-flow mode, and the counter-flow baffles are inclined at an angle of 45 degrees. The bottom of the banana corner dust removal section is provided with a scraper ash remover 5.
The tail part waste heat section 4 is transversely arranged, a plurality of coal economizers are arranged in the tail part waste heat section, and converter gas forms cross flow scouring on the coal economizers. The outlet of the tail waste heat section can be connected with a dust remover to further remove dust of the purified coal gas.
After the converter gas is subjected to primary cooling through the vaporization flue, the converter gas enters the system for dry dust removal and cooling, so that the water content and the volume of the gas are effectively reduced, the working conditions of a subsequent dust remover are greatly improved, and the load of the dust remover is reduced. The collected dust is dry particles, so that metal recovery and dust post-utilization are facilitated.
The system also comprises a steam drum, and each vertical heating assembly, the evaporation heating surface and the economizer are respectively provided with a header, an ascending pipe and a descending pipe and are respectively connected with the steam drum and the header through the ascending pipe and the descending pipe. And because the converter gas contains high-concentration CO, the shells of all the pipe sections and the connecting parts of the shells are sealed, and the parts of all the heat exchange assemblies, such as the vertical heated pipe, the vertical pipe panel, the evaporation heated pipe, the economizer, the ascending pipe, the descending pipe, the header and the like, which penetrate through the shells are sealed. Those skilled in the art will understand and envision this and will not be described in detail herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The converter gas dry dedusting and waste heat recovery system is characterized by comprising a descending cooling section (1), a banana bend dedusting section (2), an ascending cooling section (3) and a tail waste heat section (4), wherein the descending cooling section (1), the banana bend dedusting section and the ascending cooling section (3) are sequentially connected and form U-shaped connection, the tail waste heat section (4) is connected to the tail end of the ascending cooling section (3), the descending cooling section (1) and the ascending cooling section (3) are respectively arranged on two sides of the U shape, and the banana bend dedusting section (2) is arranged at the bottom of the U shape; the descending cooling section (1) comprises a descending section shell and a vertical heating assembly arranged in the descending section shell, and converter gas forms longitudinal flow scouring on the vertical heating assembly; the ascending cooling section (3) comprises an ascending section shell and a vertical evaporation heating pipe (6) arranged in the ascending section shell, and converter gas forms longitudinal flow scouring on the vertical evaporation heating pipe (6); a plurality of countercurrent baffles are arranged in the banana corner dust removal section (2), and a scraper ash remover (5) is arranged at the bottom of the banana corner dust removal section; the tail waste heat section (4) comprises a tail flue gas channel and a plurality of coal economizers arranged in the tail flue gas channel, and converter gas forms cross flow scouring on the coal economizers.
2. The converter gas dry dedusting and waste heat recovery system according to claim 1, further comprising a quenching section (7) arranged in front of the descending cooling section (1), wherein the quenching section (7) is arranged in a hollow shell manner and is of a membrane water wall structure, and a plurality of water spray holes (8) are arranged at an inlet of the quenching section (7).
3. The converter gas dry dedusting and waste heat recovery system as claimed in claim 1, wherein the descending cooling section (1) is cylindrical, and the vertical heating component is a vertical heating pipe distributed in a distributed manner.
4. The system for dry dedusting and waste heat recovery of converter gas according to claim 3, wherein the vertical heated tube is arranged in a plurality of concentric circles with the center axis of the cylinder as the center of the circle.
5. The converter gas dry dedusting and waste heat recovery system of claim 1, wherein the descending cooling section (1) is provided in a square cylinder shape, and the vertical heating component is selected from vertical heating pipes in distributed arrangement or vertical pipe panels in square surrounding arrangement.
6. The converter gas dry dedusting and waste heat recovery system of claim 1, wherein the tail waste heat section (4) is transversely arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011420181.5A CN112458230A (en) | 2020-12-07 | 2020-12-07 | Converter gas dry dedusting and waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011420181.5A CN112458230A (en) | 2020-12-07 | 2020-12-07 | Converter gas dry dedusting and waste heat recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112458230A true CN112458230A (en) | 2021-03-09 |
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ID=74800779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011420181.5A Pending CN112458230A (en) | 2020-12-07 | 2020-12-07 | Converter gas dry dedusting and waste heat recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112458230A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205710804U (en) * | 2016-04-25 | 2016-11-23 | 杭州海陆重工有限公司 | A kind of waste-heat recovery device after Converter Residual Heat Boiler |
| CN210891594U (en) * | 2019-11-01 | 2020-06-30 | 四川东华锅炉工程技术有限公司 | Positive pressure vertical water pipe waste heat boiler |
| CN213895906U (en) * | 2020-12-07 | 2021-08-06 | 北京立化科技有限公司 | Converter gas dust removal and waste heat recovery system |
-
2020
- 2020-12-07 CN CN202011420181.5A patent/CN112458230A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205710804U (en) * | 2016-04-25 | 2016-11-23 | 杭州海陆重工有限公司 | A kind of waste-heat recovery device after Converter Residual Heat Boiler |
| CN210891594U (en) * | 2019-11-01 | 2020-06-30 | 四川东华锅炉工程技术有限公司 | Positive pressure vertical water pipe waste heat boiler |
| CN213895906U (en) * | 2020-12-07 | 2021-08-06 | 北京立化科技有限公司 | Converter gas dust removal and waste heat recovery system |
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Application publication date: 20210309 |