Desulfurization, denitration and dust removal device for heating furnace
By introducing heat exchangers and mixing chambers into the flue gas treatment components of the heating furnace, the high-temperature waste gas is used to heat the flue gas, which solves the problems of temperature limitation and high energy consumption in the desulfurization, denitrification and dust removal of the heating furnace, and achieves efficient flue gas treatment and heat recovery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG TUNA ENVIRONMENTAL SCI & TECH
- Filing Date
- 2025-06-11
- Publication Date
- 2026-05-26
AI Technical Summary
In existing desulfurization, denitrification and dust removal processes for heating furnaces, SDS desulfurization is limited by temperature, fixed-bed desulfurization has a large pressure drop and high energy consumption, limited capacity to handle high sulfur loads, and requires frequent maintenance.
The flue gas treatment assembly includes first and second heat exchangers, a third heat exchanger, and a mixing chamber. It is connected to the SCR and SDS reaction towers through pipelines. The high-temperature waste gas is used to heat the flue gas. Combined with a bag filter and a fan, the flue gas temperature is increased and heat is recovered.
It effectively increased the flue gas temperature, avoided the risk of CO combustion and explosion, improved desulfurization and denitrification efficiency, reduced energy consumption, and optimized equipment maintenance frequency.
Smart Images
Figure CN224285479U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flue gas treatment technology, and more specifically, to a desulfurization, denitrification and dust removal device for a heating furnace. Background Technology
[0002] The steel rolling heating furnace is a key piece of equipment required in the steel rolling process. The main pollutants are dust, NOx, and SO2 produced from the combustion of coal gas. The flue gas temperature of the heating furnace is low, typically 70-100℃. Currently, desulfurization, denitrification, and dust removal in heating furnaces often employ SCR denitrification + SDS desulfurization + bag filter dust collection, or SCR denitrification + fixed-bed desulfurization. For the first process, SDS desulfurization is temperature-limited; if the flue gas temperature is too low, the desulfurization effect will significantly decrease. For the second process, the fixed-bed desulfurization bed has a large pressure drop, high energy consumption at high flow rates, high costs for desulfurizing agent replacement or regeneration, and limited capacity to handle high sulfur loads, requiring frequent maintenance.
[0003] Therefore, a new solution is needed to address the above problems. Utility Model Content
[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a desulfurization, denitrification and dust removal device for heating furnaces.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A desulfurization, denitrification, and dust removal device for a heating furnace includes a coal smoke outlet and an air exhaust outlet installed on the heating furnace. The coal smoke outlet and the air exhaust outlet are connected to a flue gas treatment component, which is connected to a chimney. The flue gas treatment component includes a first heat exchanger, a second heat exchanger, a third heat exchanger, and a mixing chamber. The coal smoke outlet is connected to the first and third heat exchangers in sequence via pipes, and the first and third heat exchangers are used to heat the coal smoke exhaust gas before a first SCR reaction tower. The air exhaust outlet is connected to the second heat exchanger and the mixing chamber in sequence via pipes, and the second heat exchanger and the mixing chamber are used to heat the air exhaust gas before a second SDS reaction tower. The third heat exchanger is connected to the mixing chamber via a pipe, and the high-temperature waste gas in the third heat exchanger flows into the mixing chamber.
[0007] Furthermore, the flue gas treatment assembly also includes a first SDS reaction tower, a first bag filter, a first SCR reaction tower, and a first fan. The first inlet of the first heat exchanger is connected to the coal smoke outlet through a pipeline. The first outlet of the first heat exchanger is sequentially connected to the first SDS reaction tower, the first bag filter, the third heat exchanger, and the first SCR reaction tower through pipelines. The outlet of the first SCR reaction tower is connected to the second inlet of the first heat exchanger through a pipeline. The second outlet of the first heat exchanger is connected to the first fan through a pipeline. The first fan is connected to the chimney through a pipeline.
[0008] Furthermore, the flue gas treatment assembly also includes a second SDS reaction tower, a second bag filter, a second SCR reaction tower, and a second fan. The first air inlet of the second heat exchanger is connected to the flue gas outlet through a pipe. The first air outlet of the second heat exchanger is connected in sequence through a pipe to the mixing chamber, the second SDS reaction tower, the second bag filter, and the second SCR reaction tower. The air outlet of the second SCR reaction tower is connected to the second air inlet of the second heat exchanger through a pipe. The second outlet of the second heat exchanger is connected to the second fan through a pipe. The second fan is connected to the chimney through a pipe.
[0009] Furthermore, the second air inlet of the third heat exchanger is connected to the exhaust gas outlet of the hot air furnace via a pipe, and the second air outlet of the third heat exchanger is connected to the second air inlet of the mixing chamber via a pipe.
[0010] Furthermore, both sides of the mixing chamber are provided with baffles that are inclined downward and outward, and the baffles on both sides are alternately arranged.
[0011] The beneficial effects of this utility model are:
[0012] 1. In this utility model, by setting up a first heat exchanger and a third heat exchanger, the combination of the first heat exchanger and the third heat exchanger can not only raise the temperature of the coal flue gas to the temperature required for SDS desulfurization and SCR denitrification, but also avoid the risk of combustion and explosion due to the high CO content in the coal flue gas; by setting up a second heat exchanger and a mixing chamber, the combination of the second heat exchanger and the mixing chamber can raise the temperature of the air flue gas to the temperature required for SDS desulfurization and SCR denitrification.
[0013] 2. In this utility model, the third heat exchanger is connected to the mixing chamber. On the one hand, the heat in the high-temperature waste gas from the hot air furnace can be recovered to heat the flue gas in front of the first SCR reaction tower. On the other hand, the high-temperature waste gas can be flowed into the mixing chamber to heat the air in front of the second SDS reaction tower using the heat in the high-temperature waste gas. By using the heat in the high-temperature waste gas to heat both the flue gas and the air, the heat in the high-temperature waste gas can be fully recovered and utilized. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of a structure of the desulfurization, denitrification and dust removal device for the heating furnace in this embodiment.
[0015] Figure reference numerals: 1. Coal smoke outlet; 2. Air smoke outlet; 3. Flue gas treatment assembly; 301. First heat exchanger; 302. Second heat exchanger; 303. Third heat exchanger; 304. Mixing chamber; 3041. Baffle; 305. Pipeline; 306. First SDS reaction tower; 307. First bag filter; 308. First SCR reaction tower; 309. Second SDS reaction tower; 310. Second bag filter; 311. Second SCR reaction tower; 309. Second fan; 310. Chimney; 4. Exhaust gas outlet; 5. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] Example: A desulfurization, denitrification, and dust removal device for a heating furnace, such as Figure 1 As shown, this invention addresses the issue of temperature-limited SDS desulfurization in the existing SCR denitrification + SDS desulfurization + bag filter dust collection process. It includes a coal smoke outlet 1 and a flue gas outlet 2 installed on the heating furnace. The coal smoke outlet 1 is used to discharge the coal smoke after blast furnace gas combustion, and the flue gas outlet 2 is used to discharge the flue gas after blast furnace gas combustion. The coal smoke outlet 1 and the flue gas outlet 2 are connected to a flue gas treatment component 3, which is connected to a chimney 4.
[0018] The flue gas treatment component 3 includes a first heat exchanger 301, a second heat exchanger 302, a third heat exchanger 303, and a mixing chamber 304. The coal smoke outlet 1 is connected to the first heat exchanger 301 and the third heat exchanger 303 in sequence through a pipe 305, and the first heat exchanger 301 and the third heat exchanger 303 are used to heat the coal smoke flue gas before the first SCR reaction tower 308. The air smoke outlet 2 is connected to the second heat exchanger 302 and the mixing chamber 304 in sequence through a pipe 305, and the second heat exchanger 302 and the mixing chamber 304 are used to heat the air smoke flue gas before the second SDS reaction tower 310. The third heat exchanger 303 is connected to the mixing chamber 304 through a pipe 305, and the high-temperature waste gas in the third heat exchanger 303 is flowed into the mixing chamber 304.
[0019] When the above-mentioned device performs desulfurization, denitrification, and dust removal, for the treatment of coal flue gas, the first heat exchanger 301 is used to raise the temperature of the coal flue gas before the first SDS reaction tower 306 to reach the temperature required for SDS desulfurization, and the third heat exchanger 303 is used to raise the temperature of the coal flue gas before the first SCR reaction tower 308 to reach the temperature required for SCR denitrification. By setting the first heat exchanger 301 and the third heat exchanger 303, on the one hand, the coal flue gas is raised using the first heat exchanger 301 and the third heat exchanger 303, and on the other hand, the risk of combustion and explosion due to the high CO content of the coal flue gas can be avoided.
[0020] For the treatment of flue gas, the high-temperature waste gas in the third heat exchanger 303 is flowed into the mixing chamber 304 and mixed with the flue gas. The flue gas in front of the second SDS reaction tower 310 is heated by the second heat exchanger 302 and the mixing chamber 304 to reach the temperature required for SDS desulfurization and SCR denitrification.
[0021] Furthermore, the second inlet of the third heat exchanger 303 is connected to the exhaust outlet 5 of the hot blast stove via pipe 305, and the second outlet of the third heat exchanger 303 is connected to the second inlet of the mixing chamber 304 via pipe 305. By channeling the high-temperature exhaust gas from the hot blast stove combustion to the third heat exchanger 303, on the one hand, heat in the high-temperature exhaust gas can be recovered to raise the temperature of the flue gas before the first SCR reaction tower 308; on the other hand, by connecting the third heat exchanger 303 and the mixing chamber 304, the high-temperature exhaust gas is channeled into the mixing chamber 304, where the heat in the high-temperature exhaust gas is used to raise the temperature of the air flue gas before the second SDS reaction tower 310. By setting up the third heat exchanger 303 and the mixing chamber 304, both the flue gas and the air flue gas can be heated, allowing for the full recovery and utilization of heat in the high-temperature exhaust gas. The high-temperature exhaust gas is CO2 gas.
[0022] Furthermore, both sides of the mixing chamber 304 are provided with downwardly and outwardly inclined baffles 3041, and the baffles 3041 on both sides are alternately arranged. By setting the baffles 3041, the heat in the high-temperature exhaust gas can fully heat up the flue gas, so as to ensure the temperature rise of the flue gas.
[0023] Furthermore, the flue gas treatment assembly 3 also includes a first SDS reaction tower 306, a first bag filter 307, a first SCR reaction tower 308, and a first fan 309. The first inlet of the first heat exchanger 301 is connected to the coal smoke outlet 1 via a pipe 305. The first outlet of the first heat exchanger 301 is connected to the inlet of the first SDS reaction tower 306 via a pipe 305. The outlet of the first SDS reaction tower 306 is connected to the inlet of the first bag filter 307 via a pipe 305. The outlet of the dust collector 307 is connected to the first inlet of the third heat exchanger 303 via pipe 305. The first outlet of the third heat exchanger 303 is connected to the inlet of the first SCR reaction tower 308 via pipe 305. The outlet of the first SCR reaction tower 308 is connected to the second inlet of the first heat exchanger 301 via pipe 305. The second outlet of the first heat exchanger 301 is connected to the input end of the first fan 309 via pipe 305. The output end of the first fan 309 is connected to the chimney 4 via pipe 305.
[0024] The flue gas treatment assembly 3 also includes a second SDS reaction tower 310, a second bag filter 311, a second SCR reaction tower 309, and a second fan 310. The first inlet of the second heat exchanger 302 is connected to the air outlet 2 via a pipe 305. The first outlet of the second heat exchanger 302 is connected to the first inlet of the mixing chamber 304 via a pipe 305. The outlet of the mixing chamber 304 is connected to the inlet of the second SDS reaction tower 310 via a pipe 305. The second SDS reaction tower 310... The outlet of the second bag filter 311 is connected to the inlet of the second bag filter 311 via pipe 305. The outlet of the second bag filter 311 is connected to the inlet of the second SCR reaction tower 309 via pipe 305. The outlet of the second SCR reaction tower 309 is connected to the second inlet of the second heat exchanger 302 via pipe 305. The second outlet of the second heat exchanger 302 is connected to the input end of the second fan 310 via pipe 305. The output end of the second fan 310 is connected to the chimney 4 via pipe 305.
[0025] When the above-mentioned device performs desulfurization, denitrification, and dust removal, for the treatment of coal flue gas, after the coal flue gas is discharged from the coal flue gas outlet 1, it exchanges heat with the flue gas from the first SCR reaction tower 308 through the first heat exchanger 301, so that the coal flue gas temperature is raised to the temperature required for SDS desulfurization. The first SDS reaction tower 306 and the first bag filter 307 respectively perform SDS desulfurization and dust removal on the coal flue gas. The desulfurized and dust-removed coal flue gas exchanges heat with the high-temperature exhaust gas from the hot air furnace through the third heat exchanger 303, so that the desulfurized and dust-removed coal flue gas temperature is raised to the temperature required for SCR denitrification. The first SCR reaction tower 308 performs SCR denitrification on the desulfurized and dust-removed coal flue gas. The desulfurized, denitrified, and dust-removed flue gas exchanges heat with the coal flue gas from the coal flue gas outlet 1 through the first heat exchanger 301, so that the desulfurized, denitrified, and dust-removed flue gas temperature is lowered, and then discharged to the chimney under the action of the first fan 309.
[0026] For flue gas treatment, after the flue gas is discharged from the flue gas outlet 2, it exchanges heat with the flue gas from the second SCR reaction tower 309 through the second heat exchanger 302, which raises the temperature of the flue gas. The heated flue gas is then mixed with the high-temperature waste gas from the third heat exchanger 303 in the mixing chamber 304, which further raises the temperature of the flue gas to the temperature required for SDS desulfurization and SCR denitrification. The second SDS reaction tower 310, the second bag filter 311, and the second SCR reaction tower 309 respectively perform SDS desulfurization, dust removal, and SCR denitrification on the flue gas. The flue gas after desulfurization, denitrification, and dust removal exchanges heat with the flue gas from the flue gas outlet 2 through the second heat exchanger 302, which cools the flue gas after desulfurization, denitrification, and dust removal, and it is then discharged to the chimney 4 by the action of the second fan 310.
[0027] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.
Claims
1. A desulfurization, denitrification, and dust removal device for a heating furnace, comprising a coal smoke outlet (1) and a flue gas outlet (2) disposed on the heating furnace, characterized in that, The coal smoke outlet (1) and the air smoke outlet (2) are connected to a flue gas treatment assembly (3), and are connected to a chimney (4) through the flue gas treatment assembly (3). The flue gas treatment assembly (3) includes a first heat exchanger (301), a second heat exchanger (302), a third heat exchanger (303), and a mixing chamber (304). The coal smoke outlet (1) is connected to the first heat exchanger (301) and the third heat exchanger (303) in sequence through a pipe (305), and utilizes the first heat exchanger (301) and the third heat exchanger (303). The flue gas in front of the first SCR reaction tower (308) is heated. The flue gas outlet (2) is connected to the second heat exchanger (302) and the mixing chamber (304) in sequence through the pipe (305). The flue gas in front of the second SDS reaction tower (310) is heated by the second heat exchanger (302) and the mixing chamber (304). The third heat exchanger (303) is connected to the mixing chamber (304) through the pipe (305). The high-temperature waste gas in the third heat exchanger (303) is flowed into the mixing chamber (304).
2. The desulfurization, denitrification, and dust removal device for a heating furnace according to claim 1, characterized in that, The flue gas treatment assembly (3) further includes a first SDS reaction tower (306), a first bag filter (307), a first SCR reaction tower (308), and a first fan (309). The first inlet of the first heat exchanger (301) is connected to the coal smoke outlet through a pipe (305). The first outlet of the first heat exchanger (301) is connected in sequence to the first SDS reaction tower (306), the first bag filter (307), the third heat exchanger (303), and the first SCR reaction tower (308) through a pipe (305). The outlet of the first SCR reaction tower (308) is connected to the second inlet of the first heat exchanger (301) through a pipe (305). The second outlet of the first heat exchanger (301) is connected to the first fan (309) through a pipe (305). The first fan (309) is connected to the chimney (4) through a pipe (305).
3. The desulfurization, denitrification, and dust removal device for a heating furnace according to claim 1, characterized in that, The flue gas treatment assembly (3) further includes a second SDS reaction tower (310), a second bag filter (311), a second SCR reaction tower (309), and a second fan (310). The first air inlet of the second heat exchanger (302) is connected to the air outlet through a pipe (305). The first air outlet of the second heat exchanger (302) is connected in sequence through a pipe (305) to a mixing chamber (304), a second SDS reaction tower (310), a second bag filter (311), and a second SCR reaction tower (309). The air outlet of the second SCR reaction tower (309) is connected to the second air inlet of the second heat exchanger (302) through a pipe (305). The second outlet of the second heat exchanger (302) is connected to the second fan (310) through a pipe (305). The second fan (310) is connected to the chimney (4) through a pipe (305).
4. The desulfurization, denitrification, and dust removal device for a heating furnace according to claim 1, characterized in that, The second air inlet of the third heat exchanger (303) is connected to the exhaust gas outlet (5) of the hot air furnace through a pipe (305), and the second air outlet of the third heat exchanger (303) is connected to the second air inlet of the mixing chamber (304) through a pipe (305).
5. The desulfurization, denitrification, and dust removal device for a heating furnace according to claim 1, characterized in that, Both sides of the inner cavity of the mixing chamber (304) are provided with baffles (3041) that are inclined downward and outward, and the baffles (3041) on both sides are alternately arranged.