Online cleaning device for accumulated slag in converter steelmaking tail section flue
By designing an online cleaning device, using the combination of blowing pipe and nitrogen pipe, the flue accumulation in the last section of the converter steelmaking is automatically cleaned, solving the problems of poor flue ventilation and safety hazards, and achieving efficient flue ventilation and reducing fan energy consumption.
Patent Information
- Application Number
- CN202421816266.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-30
AI Technical Summary
During the converter steelmaking process, the flue slag accumulation in the last stage of the flue duct leads to the thinning of the flue pipe, affecting the circulation of flue gas, causing unorganized dust and high energy consumption of the fan, and also poses safety hazards.
An online cleaning device is designed, including a blowing pipe, a nitrogen pipe, a partition and a pulse valve, which can spray slag accumulation through medium-pressure nitrogen, and cool the nitrogen pipe using the water inlet and return water channels to prevent high temperature melting.
Automatic flue slag cleaning is realized, which reduces safety risks, prevents high temperature melting of nitrogen pipes, improves flue ventilation efficiency, and reduces fan energy consumption.
Smart Images
Figure CN222821587U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of flue slag cleaning devices, in particular to an online cleaning device for flue slag at the end of converter steelmaking. Background Art
[0002] Converter steelmaking uses molten iron, scrap steel, and ferroalloys as the main raw materials. The process of steelmaking is completed in the converter by the physical heat of the molten iron itself and the chemical components in it reacting to generate heat. During converter steelmaking, a large amount of flue gas is discharged through the flue. The end of the vaporization flue is a point where flue gas residues are easily accumulated. When the residues accumulate at this point, the flue diameter will become thinner, affecting the circulation of flue gas, and then causing problems such as unorganized dust and high fan energy consumption. Slag accumulation in the end of the flue will also bring safety problems. For example, when the converter is overhauled or the inside of the flue is entered for inspection and maintenance, there is a risk of slag falling, which poses a safety hazard. Therefore, it is necessary to regularly clean the residue in the end of the flue. At present, the cleaning method of the end of the flue mainly relies on the operator to open the manhole of the end of the flue during the converter shutdown time for manual cleaning.
[0003] When cleaning the slag accumulated in the last section of the flue, due to the high temperature of the last section of the flue, there is a risk of high-temperature burns when dismantling the manhole and cleaning it; the residual gas ash in the flue will cause gas poisoning to the operators. Summary of the invention
[0004] The utility model aims to provide an online cleaning device for slag accumulation in the flue of the final stage of converter steelmaking, so as to solve the problems existing in the prior art.
[0005] The utility model adopts the following technical scheme to solve the technical problem: an online cleaning device for slag accumulation in the final flue of converter steelmaking, comprising a final flue, a manhole is arranged on the final flue, a cover body is bolted on the manhole, a mounting pipe is penetrated and welded on the cover body, a blow pipe is sleeved in the mounting pipe and connected through a flange, a nitrogen pipe is sleeved in the blow pipe, a plurality of partitions are welded between the nitrogen pipe and the blow pipe, the nitrogen pipe is connected to an air bag through a pipeline, and a pulse valve is installed on the pipeline.
[0006] Furthermore, one end of the injection pipe is located outside the terminal flue and the other end is located inside the terminal flue, and the space between the injection pipe and the nitrogen pipe is divided into a plurality of water inlet channels and water return channels by a partition, and the water inlet channels and water return channels are distributed at intervals.
[0007] Furthermore, one end of the blowing pipe located inside the terminal flue is welded to the nitrogen pipe, and the water inlet channel and the water return channel are connected at the one end of the blowing pipe located inside the terminal flue.
[0008] Furthermore, an annular cavity is welded to one end of the blowing pipe outside the terminal flue, and the other side of the annular cavity is welded to the nitrogen pipe. The inside of the annular cavity is hollow, and a spacer ring is welded in the annular cavity. The inner edge of the spacer ring is welded to the blowing pipe. The spacer ring divides the annular cavity into a return water chamber and a water inlet chamber. The return water chamber and the water inlet chamber are connected to the return water pipe and the water inlet pipe respectively.
[0009] Furthermore, the water return channel and the water inlet channel are connected to the water return chamber and the water inlet chamber respectively in the annular cavity, and the water return channel and the water inlet channel are not connected in the annular cavity.
[0010] Furthermore, a flange is welded on the outer wall of the middle of the blowing pipe close to the annular cavity.
[0011] The utility model has the following beneficial effects:
[0012] 1. The utility model can automatically blow away the accumulated slag in the terminal flue without manual cleaning, thus reducing potential safety hazards. It can also cool down the nitrogen pipe while blowing to prevent the nitrogen pipe from melting at high temperature.
[0013] 2. Cool down the nitrogen pipe through the water inlet channel and the water return channel to prevent the nitrogen pipe from being melted by high temperature.
[0014] 3. Use the pulse valve to blow the accumulated slag from the air bag in a pulse manner to loosen it. After it falls, it enters the evaporative cooler system driven by the wind of the dust removal fan, and then follows the discharge system of the evaporative cooler scraper, thereby achieving the purpose of automatically cleaning the accumulated slag.
[0015] 4. The water inlet channel and the water return channel are spaced apart, so the water in the water inlet channel cools down the nitrogen pipe while also cooling down the water in the water return pipe, effectively preventing the nitrogen pipe and the water return pipe from being melted by high temperature.
[0016] 5. The partition also has the function of heat transfer, increasing the heat exchange area. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of the utility model.
[0018] Figure 2 It is a schematic diagram of the connection structure of the blowing pipe and the nitrogen pipe of the utility model.
[0019] Figure 3 This utility model Figure 2 Schematic diagram of the disassembled structure at point A in the middle.
[0020] Figure 4 This utility model Figure 2 Schematic diagram of the cross-sectional structure at point B in the middle.
[0021] Figure 5It is a schematic diagram of the cross-sectional structure of the annular cavity of the utility model.
[0022] Among them: 1. The last section of the flue; 2. The manhole; 3. The cover; 4. The installation pipe; 5. The injection pipe; 6. The nitrogen pipe; 7. The partition; 8. The pipeline; 9. The air bag; 10. The pulse valve; 11. The water inlet channel; 12. The water return channel; 13. The annular cavity; 14. The partition ring; 15. The water inlet cavity; 16. The water return cavity; 17. The water inlet pipe; 18. The water return pipe; 19. The flange. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0024] like Figure 1-5 As shown, an online cleaning device for slag accumulation in the final flue 1 of converter steelmaking comprises a final flue 1, a manhole 2 is provided on the final flue 1, a cover body 3 is bolted to the manhole 2, a mounting pipe 4 is welded through the cover body 3, a blow pipe 5 is sleeved inside the mounting pipe 4 and connected to it through a flange 19, a nitrogen pipe 6 is sleeved inside the blow pipe 5, a plurality of partitions 7 are welded between the nitrogen pipe 6 and the blow pipe 5, the nitrogen pipe 6 is connected to an air bag 9 through a pipe 8, and a pulse valve 10 is installed on the pipe 8.
[0025] The pulse valve 10 is used to pulse-blow the accumulated slag from the air bag 9 to loosen and drop the slag. The slag is then driven by the wind of the dust removal fan to enter the evaporative cooler system and then discharged from the evaporative cooler scraper. The nitrogen pipe 6 is cooled by water inlet pipe 17 and water outlet pipe 18 to prevent the nitrogen pipe 6 from being melted by high temperature.
[0026] One end of the injection pipe 5 is located outside the terminal flue and the other end is located inside the terminal flue. The space between the injection pipe 5 and the nitrogen pipe 6 is divided into a plurality of water inlet channels 11 and water return channels 12 by the partition 7. The water inlet channels 11 and the water return channels 12 are arranged at intervals. Therefore, the water in the water inlet channel 11 cools the nitrogen pipe 6 and also cools the water in the water return pipe 18, effectively preventing the nitrogen pipe 6 and the water return pipe 18 from being melted by high temperature. At the same time, the partition 7 also has the function of heat transfer, increasing the heat exchange area.
[0027] One end of the blowing pipe 5 located inside the terminal flue is welded to the nitrogen pipe 6, and the water inlet channel 11 and the water return channel 12 are connected at the end of the blowing pipe 5 located inside the terminal flue. One end of the water inlet channel 11 inside the terminal flue is connected with the water return channel 12, so water enters the water return channel 12, and enters the water return chamber 16 through the water return channel 12, and then is discharged from the water return pipe 18, thereby achieving the purpose of cooling.
[0028] An annular cavity 13 is welded to one end of the blowing pipe 5 located outside the terminal flue, and the other side of the annular cavity 13 is welded to the nitrogen pipe 6. The inside of the annular cavity 13 is hollow, and a partition ring 14 is welded inside the annular cavity 13. The inner edge of the partition ring 14 is welded to the blowing pipe 5. The partition ring 14 divides the annular cavity 13 into a return water chamber 16 and a water inlet chamber 15. The return water chamber 16 and the water inlet chamber 15 are connected to a return water pipe 18 and a water inlet pipe 17 respectively.
[0029] The return water channel 12 and the inlet water channel 11 are connected to the return water chamber 16 and the inlet water chamber 15 respectively in the annular cavity 13 , and the return water channel 12 and the inlet water channel 11 are not connected in the annular cavity 13 .
[0030] A flange 19 is welded on the outer wall of the middle of the blowing pipe 5 close to the annular cavity.
[0031] The working principle of the utility model is:
[0032] When in use, the blowing pipe 5 is connected to the mounting pipe 4 through the flange 19, so that the outlet end of the nitrogen pipe 6 is aligned with the place where the slag is easily gathered in the terminal flue, and the water source on site is connected to the water inlet pipe 17 with a water pipe, and a solenoid valve is installed on the water inlet pipe 17, and the pulse valve 10 is set to start at a timer, and the solenoid valve is linked to the pulse valve 10.
[0033] After the pulse valve 10 is started, the medium-pressure nitrogen in the air bag 9 enters the nitrogen pipe 6 from the pipeline 8, and the accumulated slag is sprayed from the outlet end of the nitrogen pipe 6. The accumulated slag is loosened and falls under the action of the spraying, and then enters the evaporative cooler system driven by the wind force of the dust removal fan, and then enters the discharge system of the evaporative cooler scraper.
[0034] At the same time, the solenoid valve and the pulse valve 10 are started in conjunction, and water enters the water inlet chamber 15 from the water pipe via the water inlet pipe 17, and then enters each water inlet channel 11 from the water inlet chamber 15. The water inlet channel 11 is connected with the return water channel 12 at one end inside the terminal flue. Therefore, water enters the return water channel 12, and enters the return water chamber 16 via the return water channel 12, and then is discharged from the return water pipe 18, thereby achieving the purpose of cooling.
[0035] Due to the high temperature in the terminal flue, the jacket-type cooling method with water inlet at one end and water outlet at the other end cannot be used. Otherwise, the water in the return pipe 18 will have a high temperature after heat exchange, and the high temperature in the terminal flue will easily cause the return pipe to melt at high temperature. The only way to cool it is to have water inlet and outlet at the same end and outside the terminal flue. The water inlet channel 11 and the return water channel 12 are spaced apart, so the water in the water inlet channel 11 cools the nitrogen pipe 6 while also cooling the water in the return water pipe 18, effectively preventing the nitrogen pipe 6 and the return water pipe 18 from melting at high temperature. At the same time, the partition 7 also has the function of heat transfer, which increases the heat exchange area.
[0036] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention shall fall within the scope of protection of the present invention.
[0037] The technology, shape and structure parts not described in detail in the present invention are all known technologies.
Claims
1. An online cleaning device for slag accumulation in the final flue of converter steelmaking, comprising a final flue, wherein a manhole is provided on the final flue, and a cover is bolted to the manhole, wherein: A mounting tube is welded through the cover body, a blowing tube is sleeved inside the mounting tube and connected via a flange, a nitrogen tube is sleeved inside the blowing tube, a number of partitions are welded between the nitrogen tube and the blowing tube, the nitrogen tube is connected to an air bag via a pipeline, and a pulse valve is installed on the pipeline.
2. The on-line cleaning device for slag accumulation in the flue of the final stage of converter steelmaking according to claim 1 is characterized in that: One end of the injection pipe is located outside the terminal flue and the other end is located inside the terminal flue. The space between the injection pipe and the nitrogen pipe is divided into a plurality of water inlet channels and water return channels by a partition. The water inlet channels and water return channels are distributed at intervals.
3. The on-line cleaning device for slag accumulation in the flue of the final stage of converter steelmaking according to claim 2 is characterized in that: One end of the blowing pipe located inside the terminal flue is welded to the nitrogen pipe, and the water inlet channel and the water return channel are connected at the end of the blowing pipe located inside the terminal flue.
4. The on-line cleaning device for slag accumulation in the flue of the final stage of converter steelmaking according to claim 2 is characterized in that: An annular cavity is welded to one end of the blowing pipe outside the terminal flue, and the other side of the annular cavity is welded to the nitrogen pipe. The inside of the annular cavity is hollow, and a partition ring is welded in the annular cavity. The inner edge of the partition ring is welded to the blowing pipe. The partition ring divides the annular cavity into a return water cavity and a water inlet cavity. The return water cavity and the water inlet cavity are connected to a return water pipe and a water inlet pipe respectively.
5. The on-line cleaning device for slag accumulation in the flue of the final stage of converter steelmaking according to claim 4 is characterized in that: The water return channel and the water inlet channel are respectively connected with the water return chamber and the water inlet chamber in the annular cavity, and the water return channel and the water inlet channel are not connected in the annular cavity.
6. The on-line cleaning device for slag accumulation in the flue of the final stage of converter steelmaking according to claim 4 is characterized in that: A flange is welded on the outer wall of the middle of the blowing pipe close to the annular cavity.