Converter flue gas pure dry dust removal system
By modifying the converter flue gas dust removal system and adopting a pure dry dust removal system composed of a waste heat boiler and a flexible membrane dust collector, the problem of high water and electricity consumption in the existing process has been solved, and waste heat recovery and low dust emissions from the flue gas have been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA HAIYONG MAGNESIUM TECHNOLOGY CO LTD
- Filing Date
- 2025-09-24
- Publication Date
- 2026-07-28
AI Technical Summary
Existing converter flue gas dust removal processes are water and electricity consuming, and the dust concentration after purification is high, failing to maximize resource efficiency and meet emission standards.
A pure dry dust removal system consisting of an explosion-proof waste heat boiler, a circulating cyclone dust collector, a flexible membrane dust collector, and an AC fan replaces the existing water spray equipment, realizing waste heat recovery from flue gas and energy saving for the fan, while achieving low dust emissions through the flexible membrane dust collector.
It achieves pure dry dust removal of converter flue gas, efficient recovery of waste heat, energy saving of fans, and the dust content of the purified flue gas is less than 10mg/m3, meeting emission standards.
Smart Images
Figure CN224564626U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a dry dust removal system for converter flue gas, belonging to the field of converter flue gas treatment technology. Background Technology
[0002] Steelmaking converter flue gas is the most unique type of flue gas in the metallurgical industry, possessing three main characteristics: high temperature (800–1000℃), high CO content (up to 70%), and high dust concentration (80–150 g / m³). 3 When these three resources are combined, flue gas dust removal becomes a challenge.
[0003] Currently, the wet dust removal processes for converter flue gas used both domestically and internationally all involve water spraying for cooling and purification. These processes include the OG method and the semi-dry method. The difference between these two processes lies in the water spraying method:
[0004] The OG process uses a two-stage Venturi spray system; the semi-dry process uses a spray cooling tower and an annular dust collector. These two processes have different names depending on the state of the furnace dust.
[0005] OG process: Sludge-wastewater state—wet process;
[0006] Semi-dry process: dry powder + sludge / sewage form — semi-dry process.
[0007] The biggest commonality between these two dust removal processes is that they consume water resources and minimize the efficiency of the three major resources of converter flue gas:
[0008] The heat energy of the converter flue gas at 800-1000℃ cannot be recovered; the converter CO gas is converted into water-containing and steam-containing gas; the converter dust loses its original oxide properties and becomes water-containing oxide, which cannot be directly utilized.
[0009] Therefore, the process of dust removal from converter flue gas is a process of wasting valuable converter flue gas resources and a process of consuming water resources.
[0010] This can be expressed mathematically as:
[0011] OG method, semi-dry method = converter flue gas + water = emissions not meeting standards = emissions meeting standards + additional capital investment
[0012] To achieve waste heat recovery from converter flue gas and maximize resource efficiency, a purely dry dust removal process that does not involve water spraying is required.
[0013] The existing problems with dust collectors used in current dust removal processes:
[0014] The dust collectors currently used in the OG process are single-stage and double-stage, which consume a lot of water and electricity, and the dust concentration after purification is >100mg / m³. 3 ;
[0015] The dust collectors used in the current semi-dry process are spray coolers and annular slot dust collectors, which consume a lot of water and electricity, and the dust concentration after purification is 20mg / m³. 3 above.
[0016] Therefore, it is imperative to seek a dust removal system that is water-free, energy-saving, and produces a low dust concentration after purification.
[0017] Currently, the entire steel industry in China is seeking energy conservation, carbon reduction, and emission compliance in converters. For example, using waste heat boilers to cool converter flue gas temperatures can reduce the flue gas temperature from 800–1000℃ to 180–220℃; using flexible membrane dust collectors can achieve highly efficient dust removal, achieving flue gas emissions of <10mg / m³. 3 These advanced technologies meet national emission standards and are protected by patents.
[0018] Due to the special nature of OG and semi-dry dust removal processes, adopting the aforementioned advanced technologies requires replacing the fans with axial flow fans instead of AC fans. Additionally, a gas water cooling system must be configured to ensure that the gas temperature drops below 70°C before entering the gas holder. These factors pose significant obstacles to achieving pure dry cooling of flue gas in OG and semi-dry processes. Summary of the Invention
[0019] The purpose of this invention is to modify and replace the equipment of OG process and semi-dry dust removal process, open up the pure dry flue gas cooling process of OG process and semi-dry process, realize pure dry and clean coal gas collection of OG process and semi-dry process, realize efficient recovery of waste heat of converter flue gas and energy saving of fan, and provide a pure dry dust removal system for converter flue gas.
[0020] To achieve the above objectives, the present invention adopts the following technical solution:
[0021] A converter flue gas pure dry dust removal system includes a flue gas pre-processor, an explosion-proof waste heat boiler, a circulating cyclone dust collector, a flexible membrane dust collector group, a converter flue gas cooler, a fan, a switching station, a gas holder, and a venting tower. The system is characterized in that: the outlet of the flue gas pre-processor is connected to the flue gas inlet of the explosion-proof waste heat boiler; the flue gas outlet of the explosion-proof waste heat boiler is connected to the circulating cyclone dust collector; the circulating cyclone dust collector is connected to the flexible membrane dust collector group; the flexible membrane dust collector group is connected to the converter flue gas cooler; the converter flue gas cooler is connected to the switching station via the fan; the gas outlet of the switching station is connected to the gas holder, and the exhaust gas outlet is connected to the venting tower; the fan is an AC fan.
[0022] The explosion-proof waste heat boiler is a vertical waste heat boiler, and it is equipped with a briquetting machine system.
[0023] The briquetting machine system is connected to an explosion-proof waste heat boiler via a pneumatic ash conveying pipeline.
[0024] The flexible membrane dust collector in the flexible membrane dust collector group is a YT flexible membrane dust collector.
[0025] The converter flue gas cooler is a vertical cooler, including a shell. An explosion-proof device is provided on the upper part of the shell, and multiple sections of stainless steel finned coils are provided from top to bottom below the explosion-proof device inside the shell.
[0026] The advantages of this utility model are: it modifies the equipment of OG process and semi-dry process, replacing the two-stage Venturi spray equipment of OG process or the spray cooling tower spray and annular dust collector spray equipment of semi-dry process with waste heat boiler and other equipment; the fan adopts AC fan, and the equipment connected after the fan remains unchanged, which makes the modification highly feasible and saves space; pure dry dust removal can maintain the original oxide composition of furnace dust; it realizes efficient recovery of waste heat of converter flue gas and fan power saving, flue gas emission meets the standards, and can obtain pure dry and clean coal gas.
[0027] Compared with the OG process and the semi-dry process, this utility model is as follows:
[0028] Attached Figure Description
[0029] Figure 1 This is a schematic diagram of the structure of this utility model;
[0030] Figure 2 This is a schematic diagram of the converter flue gas cooler.
[0031] In the diagram: 1-Converter, 2-Explosion-proof waste heat boiler, 3-Circulating cyclone dust collector, 4-Converter flue gas cooler, 5-Fan, 6-Switching station, 7-Gas holder, 8-Flue gas pre-processor, 9-Flexible membrane dust collector group, 10-Pneumatic ash conveying pipeline, 11-Bulking machine system, 12-Ventilation tower, 41-Shell, 42-Explosion-proof device, 43-Stainless steel finned coil, 44-Stainless steel finned coil inlet, 45-Support, 46-Stainless steel finned coil outlet. Detailed Implementation
[0032] The present invention will be further described below with reference to embodiments, but these do not constitute a limitation on the scope of protection of the present invention:
[0033] Referring to the accompanying drawings, this utility model includes a flue gas pre-processor 8, an explosion-proof waste heat boiler 2, a circulating cyclone dust collector 3, a flexible membrane dust collector group 9, a converter flue gas cooler 4, an AC fan 5, a switching station 6, a gas holder 7, and a venting tower 12. The explosion-proof waste heat boiler 2 is a vertical waste heat boiler equipped with a briquetting machine system 11. The briquetting machine system 11 is connected to the explosion-proof waste heat boiler 2 via a pneumatic ash conveying pipe 10. Shot removal and ash removal are performed; the outlet of the flue gas pre-processor 8 is connected to the flue gas inlet of the explosion-proof waste heat boiler 2 via a pipeline, the flue gas outlet of the explosion-proof waste heat boiler 2 is connected to the circulating cyclone dust collector 3 via a pipeline, the circulating cyclone dust collector 3 is connected to the flexible membrane dust collector group 9, the flexible membrane dust collector group 9 is connected to the converter flue gas cooler 4, the converter flue gas cooler 4 is connected to the switching station 6 via the AC fan 5, the gas outlet of the switching station 6 is connected to the gas holder 7, and the waste gas outlet is connected to the venting tower 12. The flexible membrane dust collector in the flexible membrane dust collector group 9 is a YT flexible membrane dust collector; the converter flue gas cooler 4 is a vertical cooler, including a shell 41, an explosion-proof device 42 is provided on the upper part of the shell 41, and multiple stainless steel finned coils 43 are provided from top to bottom below the explosion-proof device 42 inside the shell 41. The shell 41 is supported by a bracket 45. The water inlet 44 of the stainless steel finned coil 43 is located at the lower part of the stainless steel finned coil, and the water outlet 46 is located at the upper part of the stainless steel finned coil. Both the water inlet 44 and the water outlet 46 of the stainless steel finned coil 43 are connected to a water collection tank, and the water in the water collection tank is driven by a water pump to circulate between the stainless steel finned coil 43 and the water collection tank.
[0034] The converter flue gas pure dry dust removal system of this utility model connects the flue gas outlet of converter 1 to the vaporization flue via a hood, and the vaporization flue is connected to the flue gas pre-processor 8. The flue gas treatment process is as follows:
[0035] The converter outlet flue gas temperature is approximately 1600℃, which is cooled to 800-1000℃ after passing through the hood and vaporization flue. The dust concentration in the flue gas is 80-150 g / m³. 3 The flue gas enters the flue gas pre-processor 8 to remove large particulate matter. Then, the flue gas enters the explosion-proof waste heat boiler 2 to be cooled to 170–220°C, simultaneously generating 75–80 kg / t of steam. The flue gas then passes through the circulating cyclone dust collector 3 for dust removal, reducing the dust content to 28–35 g / m³. 3 The flue gas is then treated by a flexible membrane dust collector group 9, and the temperature is reduced to below 70℃ by a converter flue gas cooler 4. The flue gas is then sent to a switching station 6 by an AC fan 5, where it is switched to obtain pure dry coal gas, which is then sent to a gas holder 7. The dust content of the treated flue gas is reduced to less than 10 mg / m³. 3 It fully meets the emission standards and is sent to the venting tower 12 for discharge. Example:
[0036] The converter flue gas pure dry dust removal system of this utility model was tested in the No. 4 converter of a steel plant. The initial test was conducted in 57 heats, and 200 heats were produced in formal production. The operation status all met the ideal design indicators.
Claims
1. A converter flue gas pure dry dust removal system, comprising a flue gas pre-processor, an explosion-proof waste heat boiler, a circulating cyclone dust collector, a flexible membrane dust collector group, a converter flue gas cooler, a fan, a switching station, a gas holder, and a venting tower, characterized in that: The flue gas pretreatment outlet is connected to the flue gas inlet of the explosion-proof waste heat boiler, the flue gas outlet of the explosion-proof waste heat boiler is connected to a circulating cyclone dust collector, the circulating cyclone dust collector is connected to a flexible membrane dust collector group, the flexible membrane dust collector group is connected to a converter flue gas cooler, the converter flue gas cooler is connected to a switching station via a fan, the gas outlet of the switching station is connected to a gas holder, and the waste gas outlet is connected to a venting tower; the fan is an AC fan.
2. The converter flue gas pure dry dust removal system according to claim 1, characterized in that: The explosion-proof waste heat boiler is a vertical waste heat boiler, and it is equipped with a briquetting machine system.
3. The converter flue gas pure dry dust removal system according to claim 2, characterized in that: The briquetting machine system is connected to an explosion-proof waste heat boiler via a pneumatic ash conveying pipeline.
4. The converter flue gas pure dry dust removal system according to claim 1, characterized in that: The flexible membrane dust collector in the flexible membrane dust collector group is a YT flexible membrane dust collector.
5. The converter flue gas pure dry dust removal system according to claim 1, characterized in that: The converter flue gas cooler is a vertical cooler, including a shell. An explosion-proof device is provided on the upper part of the shell, and multiple sections of stainless steel finned coils are provided from top to bottom below the explosion-proof device inside the shell.