Roasting furnace flue gas treatment equipment
By combining SNCR denitrification, metallurgical coke adsorption, RTO regenerative high-temperature combustion, wet desulfurization, and wet electrostatic precipitator, the problem of substandard treatment of VOCs and benzo[a]pyrene in flue gas was solved, achieving ultra-low emission flue gas treatment effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-03-17
AI Technical Summary
Existing flue gas treatment processes are unable to effectively treat VOCs and benzo[a]pyrene, resulting in flue gas emissions failing to meet standards.
The system employs a combination of SNCR denitrification unit, metallurgical coke adsorption unit, RTO regenerative high-temperature combustion unit, wet desulfurization unit, and wet electrostatic precipitator to gradually remove nitrogen oxides, asphalt fumes, VOCs, benzo[a]pyrene, sulfur dioxide, and dust from flue gas through dry denitrification, adsorption, combustion, and wet treatment.
It achieved ultra-low emissions of flue gas, with emission standards of sulfur dioxide <14mg/m3, dust <4mg/m3, asphalt fumes <1mg/m3, VOCs <10mg/m3, and benzo[a]pyrene <0μg/m3, significantly improving the flue gas treatment effect.
Smart Images
Figure CN224004232U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flue gas treatment technology, specifically a flue gas treatment device for a roasting furnace. Background Technology
[0002] During the baking process of prebaked carbon anodes in a baking furnace, a large amount of flue gas containing harmful substances is generated. This flue gas contains sulfur dioxide, dust, asphalt fumes, VOCs, benzo[a]pyrene, etc. Typical flue gas component concentrations are as follows: sulfur dioxide (900-1300 mg / m³). 3 Dust (90-100mg / m³) 3 ), asphalt fumes (100-150mg / m³) 3 VOCs (50-70 mg / m³) 3 ), benzo[a]pyrene (1-1.5 μg / m 3 ).
[0003] The existing flue gas treatment process is: spray tower + electrostatic precipitator + desulfurization + wet electrostatic precipitator. Although the content of sulfur dioxide, dust and asphalt fumes is reduced after flue gas treatment (generally sulfur dioxide <35mg / m³), the results are still relatively low. 3 Dust <10mg / m³ 3 Asphalt fumes <10mg / m³ 3 However, VOCs and benzo[a]pyrene were not treated, resulting in poor treatment effectiveness. Utility Model Content
[0004] To address the aforementioned issues, this application provides a calcining furnace flue gas treatment device that can not only treat sulfur dioxide, dust, and asphalt fumes in the flue gas, but also reduce the content of VOCs and benzo[a]pyrene, effectively improving the flue gas treatment effect and achieving ultra-low emissions.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] A flue gas treatment device for a roasting furnace includes an SNCR denitrification device, a metallurgical coke adsorption device, an RTO regenerative high-temperature combustion device, a wet desulfurization device, a wet electrostatic precipitator, and an induced draft fan. The flue gas passes sequentially through the SNCR denitrification device, the metallurgical coke adsorption device, the RTO regenerative high-temperature combustion device, the wet desulfurization device, and the wet electrostatic precipitator under the suction of the induced draft fan.
[0007] Furthermore, the induced draft fan includes a primary induced draft fan and a secondary induced draft fan. The primary induced draft fan is installed on the pipeline between the metallurgical coke adsorption device and the RTO regenerative high-temperature combustion device, and the secondary induced draft fan is installed on the pipeline between the RTO regenerative high-temperature combustion device and the wet desulfurization device.
[0008] Furthermore, the metallurgical coke adsorption device includes a reactor and a dust collector. The reactor includes a flue gas inlet, a powder inlet, and a mixture outlet. The dust collector includes a mixture inlet and a flue gas outlet. The mixture outlet of the reactor is connected to the mixture inlet of the dust collector. A powder injector for injecting metallurgical coke powder into the reactor is provided on the powder inlet of the reactor.
[0009] Furthermore, the dust collector is provided with a powder outlet at the bottom, and a conveying device for receiving metallurgical coke powder discharged from the powder outlet is provided below the dust collector.
[0010] Furthermore, the reactor includes an outer cylinder, an inner cylinder is disposed inside the outer cylinder, a powder spraying pipe is disposed on the outer cylinder, and the outlet end of the powder spraying pipe extends through the side wall of the outer cylinder into the interior of the outer cylinder and is located downstream of the inner cylinder.
[0011] Furthermore, the inner cylinder has a conical structure, and the diameter of the inner cylinder gradually decreases along the flow direction of the flue gas.
[0012] Furthermore, the powder spraying pipe is arranged at an angle, and the angle formed between the powder spraying pipe and the upstream end of the outer cylinder is an acute angle.
[0013] Furthermore, a conditioning tower for cooling the flue gas is provided between the SNCR denitrification device and the metallurgical coke adsorption device. The conditioning tower includes a tower body, and a number of spray pipes are provided at the upper end of the tower body. Each spray pipe is equipped with a spray gun, which can atomize water and spray it into the tower body.
[0014] Furthermore, it also includes a first manifold, a second manifold, a third manifold, a fourth manifold, and a fifth manifold;
[0015] Several SNCR denitrification devices are installed on the upstream side of the first manifold, and each SNCR denitrification device is connected to the first manifold through a conditioning tower.
[0016] Several metallurgical coke adsorption devices are installed between the first and second confluence pipes. The flue gas inlet of the metallurgical coke adsorption device is connected to the first confluence pipe, and the flue gas outlet of the metallurgical coke adsorption device is connected to the second confluence pipe.
[0017] Several primary exhaust fans are installed between the second and third manifolds. The inlet of the primary exhaust fan is connected to the second manifold, and the outlet of the primary exhaust fan is connected to the third manifold.
[0018] Several RTO regenerative high-temperature combustion devices are installed between the third and fourth manifolds. The inlet of the RTO regenerative high-temperature combustion device is connected to the third manifold, and the outlet of the RTO regenerative high-temperature combustion device is connected to the fourth manifold.
[0019] Several secondary exhaust fans are installed between the fourth and fifth manifolds. The inlet of the secondary exhaust fan is connected to the fourth manifold, and the outlet of the secondary exhaust fan is connected to the fifth manifold.
[0020] Several wet desulfurization devices are installed on the downstream side of the fifth confluence pipe, and each of the wet desulfurization devices is equipped with a wet electrostatic precipitator at its upper end.
[0021] Furthermore, it also includes a sixth manifold, the outlet of the wet electrostatic precipitator is connected to the sixth manifold, and a chimney is installed on the sixth manifold.
[0022] The beneficial effects of this utility model are:
[0023] This application provides a calcining furnace flue gas treatment device that sequentially includes an SNCR denitrification unit, a metallurgical coke adsorption unit, an RTO regenerative high-temperature combustion unit, a wet desulfurization unit, and a wet electrostatic precipitator. The SNCR denitrification unit removes nitrogen oxides from the flue gas using dry denitrification. The metallurgical coke adsorption unit removes some asphalt fumes and benzo[a]pyrene from the flue gas. The RTO regenerative high-temperature combustion unit removes the remaining asphalt fumes, benzo[a]pyrene, and VOCs from the flue gas. Finally, the wet desulfurization unit and the wet electrostatic precipitator remove sulfur dioxide and dust from the flue gas. The flue gas treated by this system achieves ultra-low emissions (sulfur dioxide < 14 mg / m³). 3 Dust < 4 mg / m³ 3 Asphalt fumes <1mg / m³ 3 VOCs < 10 mg / m³ 3 Benzo[a]pyrene < 0 μg / m 3 This effectively improves the treatment effect of flue gas and achieves energy conservation and emission reduction. Attached Figure Description
[0024] Figure 1 A front view of a calcining furnace flue gas treatment device provided in an embodiment of this application;
[0025] Figure 2 This is a schematic diagram of the internal structure of the reactor;
[0026] Figure 3 for Figure 2 A magnified structural diagram of part A in the middle;
[0027] Figure 4 for Figure 2 A magnified structural diagram of part B in the middle section;
[0028] Figure 5 A top view of a calcining furnace flue gas treatment device provided in an embodiment of this application;
[0029] Figure 6 This is a schematic diagram of the connection structure of the sixth busbar.
[0030] Figure 7 This is a schematic diagram of the three-dimensional structure of the conditioning tower;
[0031] Figure 8 This is a top view of the conditioning tower.
[0032] In the diagram: 1. SNCR denitrification unit;
[0033] 2. Metallurgical coke adsorption device; 21. Reactor; 211. Outer cylinder; 2111. Flue gas inlet; 2112. Mixture outlet; 212. Inner cylinder; 2121. End plate; 213. Powder injection pipe; 2131. Powder inlet; 214. First support; 215. Second support; 22. Dust collector; 221. Mixture inlet; 222. Powder outlet; 223. Flue gas outlet; 23. Conveying device;
[0034] 3. Regenerative Thermal Oxidizer (RTO) high-temperature combustion device;
[0035] 4. Wet desulfurization unit;
[0036] 5. Wet electrostatic precipitator;
[0037] 61. Primary induced draft fan; 62. Secondary induced draft fan;
[0038] 7. Conditioning tower; 71. Tower body; 72. Nozzle;
[0039] 81. First manifold; 82. Second manifold; 83. Third manifold; 84. Fourth manifold; 85. Fifth manifold; 86. Sixth manifold; 87. Chimney. Detailed Implementation
[0040] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings. The described embodiments are merely a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort should fall within the protection scope of this application.
[0041] like Figure 1 As shown, a flue gas treatment device for a roasting furnace includes an SNCR denitrification unit 1, a metallurgical coke adsorption unit 2, an RTO regenerative high-temperature combustion unit 3, a wet desulfurization unit 4, a wet electrostatic precipitator 5, and an induced draft fan. The SNCR denitrification unit 1 removes nitrogen oxides from the flue gas. The metallurgical coke adsorption unit 2 removes some asphalt fumes and some benzo[a]pyrene from the flue gas. The RTO regenerative high-temperature combustion unit 3 removes the remaining asphalt fumes, benzo[a]pyrene, and VOCs from the flue gas. The wet desulfurization unit 4 and the wet electrostatic precipitator 5 remove sulfur dioxide and dust from the flue gas. Under the suction of the induced draft fan, the flue gas sequentially passes through the SNCR denitrification unit 1, the metallurgical coke adsorption unit 2, the RTO regenerative high-temperature combustion unit 3, the wet desulfurization unit 4, and the wet electrostatic precipitator 5, thereby removing nitrogen oxides, sulfur dioxide, dust, asphalt fumes, VOCs, and benzo[a]pyrene from the flue gas.
[0042] In one specific implementation, the induced draft fan in this embodiment includes a primary induced draft fan 61 and a secondary induced draft fan 62. The primary induced draft fan 61 is installed on the pipeline between the metallurgical coke adsorption device 2 and the RTO regenerative high-temperature combustion device 3, and the secondary induced draft fan 62 is installed on the pipeline between the RTO regenerative high-temperature combustion device 3 and the wet desulfurization device 4.
[0043] like Figure 1 As shown, the metallurgical coke adsorption device 2 includes a reactor 21 and a dust collector 22. The reactor 21 includes a flue gas inlet 2111, a powder inlet 2131, and a mixture outlet 2112. The dust collector 22 includes a mixture inlet 221, a powder outlet 222, and a flue gas outlet 223. The mixture outlet 2112 of the reactor 21 is connected to the mixture inlet 221 of the dust collector 22. A powder injector (not shown in the figure) for injecting metallurgical coke powder into the reactor 21 is provided on the powder inlet 2131 of the reactor 21.
[0044] During operation, the denitrified flue gas enters the reactor 21 through the flue gas inlet 2111 and mixes with the metallurgical coke powder injected by the powder injector to form a mixture. The mixture enters the dust collector 22 under the suction of the induced draft fan. At this time, some of the asphalt fumes and benzo[a]pyrene in the flue gas are adsorbed on the metallurgical coke powder and discharged from the powder outlet 222 of the dust collector 22 along with the metallurgical coke powder. The remaining flue gas is discharged from the flue gas outlet 223 of the dust collector 22.
[0045] like Figure 2 , Figure 3 ,and Figure 4As shown, the reactor 21 includes an outer cylinder 211 open at both ends, and an inner cylinder 212 with a conical structure is disposed inside the outer cylinder 211, with the diameter of the inner cylinder 212 gradually decreasing along the flow direction of the flue gas. The inner cylinder 212 is coaxially arranged with the outer cylinder 211 and is fixedly connected to the outer cylinder 211 by a connecting structure. A powder injection pipe 213 is disposed on the outer cylinder 211, the inlet end of which is the powder inlet 2131, and the outlet end of which extends through the side wall of the outer cylinder 211 into the interior of the outer cylinder 211 and is located downstream of the inner cylinder 212. The powder injection pipe 213 is arranged at an angle, and the angle formed by the powder injection pipe 213 and the upstream end of the outer cylinder 211 is an acute angle.
[0046] In one specific embodiment, the two ends of the inner cylinder 212 are fixedly connected to the outer cylinder 211 via a first bracket 214 and a second bracket 215, respectively. The outer end of the first bracket 214 is fixedly connected to the outer cylinder 211 by welding. An annular end plate 2121 is fixedly provided at the larger diameter end of the inner cylinder 212, and the inner end of the first bracket 214 is fixedly connected to the end plate 2121 by screws. The outer end of the second bracket 215 is fixedly connected to the outer cylinder 211 by welding, and the inner end of the second bracket 215 is fixedly connected to the side wall of the inner cylinder 212 by screws.
[0047] In one specific embodiment, a plurality of first supports 214 are provided between the outer cylinder 211 and the inner cylinder 212, and the plurality of first supports 214 are evenly arranged along the circumferential direction. For example, three first supports 214 are provided between the outer cylinder 211 and the inner cylinder 212.
[0048] In one specific embodiment, a plurality of second supports 215 are provided between the outer cylinder 211 and the inner cylinder 212, and the plurality of second supports 215 are evenly arranged along the circumferential direction. For example, three second supports 215 are provided between the outer cylinder 211 and the inner cylinder 212.
[0049] In one specific embodiment, the outer cylinder 211 is provided with a plurality of powder spraying pipes 213, and the plurality of powder spraying pipes 213 are evenly arranged along the circumferential direction. For example, the outer cylinder 211 is provided with two powder spraying pipes 213.
[0050] In one specific embodiment, the outer cylinder 211 includes a first conical segment, a second conical segment, and a connecting segment for connecting the first and second conical segments. The first conical segment, the second conical segment, and the connecting segment are arranged coaxially. The first conical segment is located upstream of the connecting segment, and its diameter gradually increases in the direction away from the connecting segment. The second conical segment is located downstream of the connecting segment, and its diameter also gradually increases in the direction away from the connecting segment. The inner cylinder 212 is located within the first conical segment, and the outlet end of the powder spraying pipe 213 extends through the sidewall of the first conical segment into the first conical segment.
[0051] In one embodiment, the powder injector described in this example is a blower, that is, during operation, the blower blows metallurgical coke powder from the powder injection pipe 213 into the reactor 21.
[0052] Furthermore, the powder outlet 222 of the dust collector 22 is located at the bottom of the dust collector 22, and a conveying device 23 is provided below the dust collector 22. The metallurgical coke powder discharged from the powder outlet 222 of the dust collector 22 falls onto the conveying device 23 and is conveyed to the silo (not shown in the figure) by the conveying device 23. The metallurgical coke powder recovered from the dust collector 22 can be used to make pellets, and the pellets can be reused in the roasting furnace as metallurgical coke.
[0053] In one specific implementation, the conveying device 23 described in this embodiment is a screw conveyor 23.
[0054] Furthermore, since the temperature at the flue gas outlet 223 of the roasting furnace is between 90-220°C, the asphalt fumes in the flue gas are in a gaseous state above 100°C. At this temperature, the adsorption capacity between the flue gas and metallurgical coke powder is relatively small, which is not conducive to ensuring ultra-low emission standards. To ensure optimal adsorption effect, the flue gas temperature needs to be controlled at 90-100°C. Therefore, as follows... Figure 1 As shown, a conditioning tower 7 for cooling the flue gas is provided between the SNCR denitrification device 1 and the metallurgical coke adsorption device 2.
[0055] like Figure 7 and Figure 8 As shown, the conditioning tower 7 includes a tower body 71. Several nozzles 72 are evenly distributed along the circumference of the upper end of the tower body 71, and each nozzle 72 is equipped with a spray gun (not shown in the figure). The inlet of the spray gun is connected to a water pump (not shown in the figure) via a pipeline, and the outlet of the spray gun is connected to the nozzle 72. The spray gun can atomize water and spray it into the tower body 71, thereby cooling the flue gas and improving the cooling effect.
[0056] In one specific embodiment, five nozzles 72 are evenly distributed along the circumferential direction at the upper end of the tower body 71 in this embodiment.
[0057] Furthermore, such as Figure 1 and Figure 5 As shown, a calcining furnace flue gas treatment device also includes a first manifold 81, a second manifold 82, a third manifold 83, a fourth manifold 84, and a fifth manifold 85.
[0058] Several SNCR denitrification devices 1 are installed on the upstream side of the first manifold 81. Each SNCR denitrification device 1 is equipped with a conditioning tower 7 on the downstream side. The outlet of the SNCR denitrification device 1 is connected to the inlet of the corresponding conditioning tower 7 through a pipeline. The outlets of several conditioning towers 7 are all connected to the first manifold 81 through pipelines.
[0059] A plurality of metallurgical coke adsorption devices 2 are provided between the first manifold 81 and the second manifold 82. The flue gas inlet 2111 of the metallurgical coke adsorption device 2 is connected to the first manifold 81 through a pipeline, and the flue gas outlet 223 of the metallurgical coke adsorption device 2 is connected to the second manifold 82 through a pipeline.
[0060] Several primary exhaust fans 61 are installed between the second manifold 82 and the third manifold 83. The inlet of the primary exhaust fan 61 is connected to the second manifold 82 through a pipeline, and the outlet of the primary exhaust fan 61 is connected to the third manifold 83 through a pipeline.
[0061] Several RTO (Regenerative Thermal Oxidizer) high-temperature combustion devices 3 are installed between the third manifold 83 and the fourth manifold 84. The inlet of the RTO high-temperature combustion device 3 is connected to the third manifold 83 through a pipeline, and the outlet of the RTO high-temperature combustion device 3 is connected to the fourth manifold 84 through a pipeline.
[0062] Several secondary exhaust fans 62 are installed between the fourth manifold 84 and the fifth manifold 85. The inlet of the secondary exhaust fan 62 is connected to the fourth manifold 84 through a pipeline, and the outlet of the secondary exhaust fan 62 is connected to the fifth manifold 85 through a pipeline.
[0063] Several wet desulfurization devices 4 are installed on the downstream side of the fifth manifold 85. The inlet of the wet desulfurization device 4 is connected to the fifth manifold 85 through a pipeline, and a wet electrostatic precipitator 5 is installed at the upper end of each wet desulfurization device 4.
[0064] In one specific implementation, in this embodiment, two SNCR denitrification devices 1 are installed upstream of the first manifold 81, three metallurgical coke adsorption devices 2 are installed between the first manifold 81 and the second manifold 82, three primary induced draft fans 61 are installed between the second manifold 82 and the third manifold 83, three RTO regenerative high-temperature combustion devices 3 are installed between the third manifold 83 and the fourth manifold 84, three secondary induced draft fans 62 are installed between the fourth manifold 84 and the fifth manifold 85, and two wet desulfurization devices 4 are installed downstream of the fifth manifold 85.
[0065] Furthermore, such as Figure 6 As shown, a calcining furnace flue gas treatment device also includes a sixth manifold 86, and the outlet of the wet electrostatic precipitator 5 is connected to the sixth manifold 86 through pipelines. A chimney 87 is installed on the sixth manifold 86.
[0066] Other embodiments obtained by those skilled in the art based on the embodiments provided in this application by combining, splitting, or reorganizing the embodiments of this application do not exceed the protection scope of this application.
[0067] The above detailed embodiments have provided a detailed explanation of the purpose, technical solutions, and beneficial effects of the embodiments of this application. The above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. That is, any modifications, equivalent substitutions, improvements, etc., made on the basis of the embodiments of this application should be included within the protection scope of the embodiments of this application.
Claims
1. A calciner flue gas treatment plant, characterized by: The flue gas passes through the SNCR denitration device (1), the metallurgical coke adsorption device (2), the RTO heat accumulating high-temperature combustion device (3), the wet desulfurization device (4), the wet electric dust removal device (5) and the induced draft fan in sequence under the suction of the induced draft fan.
2. A calciner flue gas treatment apparatus according to claim 1, characterised in that: The induced draft fan comprises a first induced draft fan (61) and a second induced draft fan (62), the first induced draft fan (61) is arranged on the pipeline between the metallurgical coke adsorption device (2) and the RTO heat accumulating high-temperature combustion device (3), and the second induced draft fan (62) is arranged on the pipeline between the RTO heat accumulating high-temperature combustion device (3) and the wet desulfurization device (4).
3. A calciner flue gas treatment apparatus according to claim 1, characterized in that: The metallurgical coke adsorption device (2) comprises a reactor (21) and a dust collector (22), the reactor (21) comprises a flue gas inlet (2111), a powder inlet (2131) and a mixture outlet (2112), the dust collector (22) comprises a mixture inlet (221) and a flue gas outlet (223), the mixture outlet (2112) of the reactor (21) is connected with the mixture inlet (221) of the dust collector (22), and a powder injector for injecting metallurgical coke powder into the reactor (21) is arranged on the powder inlet (2131) of the reactor (21).
4. A calciner flue gas treatment apparatus according to claim 3, characterised in that: A powder outlet (222) is arranged at the bottom of the dust collector (22), and a conveying device (23) for receiving the metallurgical coke powder discharged from the powder outlet (222) is arranged below the dust collector (22).
5. A calciner flue gas treatment apparatus according to claim 3, characterised in that: The reactor (21) comprises an outer cylinder (211), an inner cylinder (212) is arranged in the outer cylinder (211), a powder injection pipe (213) is arranged on the outer cylinder (211), the outlet end of the powder injection pipe (213) extends to the inside of the outer cylinder (211) through the side wall of the outer cylinder (211) and is located on the downstream side of the inner cylinder (212).
6. A calciner flue gas treatment apparatus according to claim 5, characterised in that: The inner cylinder (212) is in a conical structure, and the diameter of the inner cylinder (212) gradually decreases along the flow direction of the flue gas.
7. A calciner flue gas treatment apparatus according to claim 5, characterised in that: The powder injection pipe (213) is arranged obliquely, and the included angle between the powder injection pipe (213) and the upstream end of the outer cylinder (211) is an acute angle.
8. A calciner flue gas treatment apparatus according to claim 1, characterized in that: A conditioning tower (7) for cooling the flue gas is arranged between the SNCR denitration device (1) and the metallurgical coke adsorption device (2), the conditioning tower (7) comprises a tower body (71), a plurality of spray pipes (72) are arranged on the upper end of the tower body (71), a spray gun is arranged on each spray pipe (72), and the spray gun can spray water mist into the tower body (71) after atomization.
9. A calciner flue gas treatment apparatus according to claim 8, characterised in that: The first, second, third, fourth and fifth collecting pipelines (81, 82, 83, 84 and 85) are further arranged. The upstream side of the first collecting pipe (81) is provided with several SNCR denitration devices (1), each of which is connected with the first collecting pipe (81) through a conditioning tower (7); The first collecting pipe (81) and the second collecting pipe (82) are provided with several metallurgical coke adsorption devices (2), the flue gas inlet (2111) of the metallurgical coke adsorption device (2) is connected with the first collecting pipe (81), and the flue gas outlet (223) of the metallurgical coke adsorption device (2) is connected with the second collecting pipe (82); The second collecting pipe (82) and the third collecting pipe (83) are provided with several primary induced draft fans (61), the inlet of the primary induced draft fan (61) is connected with the second collecting pipe (82), and the outlet of the primary induced draft fan (61) is connected with the third collecting pipe (83); The third collecting pipe (83) and the fourth collecting pipe (84) are provided with several RTO heat accumulating high-temperature combustion devices (3), the inlet of the RTO heat accumulating high-temperature combustion device (3) is connected with the third collecting pipe (83), and the outlet of the RTO heat accumulating high-temperature combustion device (3) is connected with the fourth collecting pipe (84); The fourth collecting pipe (84) and the fifth collecting pipe (85) are provided with several secondary induced draft fans (62), the inlet of the secondary induced draft fan (62) is connected with the fourth collecting pipe (84), and the outlet of the secondary induced draft fan (62) is connected with the fifth collecting pipe (85); The downstream side of the fifth collecting pipe (85) is provided with several wet desulfurization devices (4), and the upper end of each wet desulfurization device (4) is provided with a wet electric dust removal device (5).
10. A calciner flue gas treatment apparatus according to claim 9, characterised in that: A sixth collecting pipe (86) is further included, the outlet of the wet electric dust removal device (5) is connected with the sixth collecting pipe (86), and a chimney (87) is arranged on the sixth collecting pipe (86).