Multi-working-condition multi-purpose smelting furnace flue gas treatment system

Abstract

The invention discloses a multi-working-condition multipurpose smelting furnace flue gas treatment system which comprises a smelting furnace, the smelting furnace is connected with a settling chamber through a first vaporization flue, the settling chamber is connected with a cyclone dust collector, the cyclone dust collector is connected with an evaporator through a second vaporization flue, and a flue gas outlet of the evaporator is communicated with inlets of two heat insulation flues at the same time. The two heat insulation flues are not communicated with each other and are respectively defined as a first heat insulation flue and a second heat insulation flue, the first heat insulation flue is connected with a coal economizer, a first flue gas baffle valve is arranged on the first heat insulation flue, the coal economizer is connected with a bag-type dust collector, and the bag-type dust collector is connected with a torch incineration system through a first induced draft fan; the second heat insulation flue is connected with an electric dust remover, a second flue gas baffle valve is arranged on the second heat insulation flue, the electric dust remover is connected with an acid making system and a desulfurization system through a second induced draft fan in two ways, and an air blower is arranged at an inlet of the first vaporization flue. The invention has the advantages of energy conservation and environmental protection.

Description

Technical Field

[0001] The present invention relates to the technical fields of energy conservation and environmental protection, boiler design, smoke collection and waste gas incineration, and in particular to a multi-operating-mode and multi-purpose smelting furnace flue gas treatment system for recovering waste heat from high-temperature flue gas in the metal smelting industry. Background Art

[0002] In the metal smelting industry, a large amount of high-temperature dusty toxic and harmful flue gas is often generated, which contains combustible components. At present, the main method is to recover the waste heat of the high-temperature flue gas above 800℃, and then use the flue gas cooling method to cool it down by spraying water, which produces a large amount of wastewater and pollutes the environment. There is a lack of waste heat recovery function for low-temperature flue gas, and the dust collection mainly adopts washing, which consumes huge energy. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-operating-mode and multi-purpose smelting furnace flue gas treatment system which is energy-saving and environmentally friendly and can effectively recycle the waste heat of flue gas.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a multi-mode multi-purpose smelting furnace flue gas treatment system, comprising a smelting furnace, wherein the outlet of the smelting furnace is connected to the inlet of a first vaporization flue, the outlet of the first vaporization flue is connected to the flue gas inlet of a settling chamber, the flue gas outlet of the settling chamber is connected to the inlet of a cyclone dust collector, the outlet of the cyclone dust collector is connected to the inlet of a second vaporization flue, the outlet of the second vaporization flue is connected to the flue gas inlet of an evaporator, the flue gas outlet of the evaporator is simultaneously connected to the inlets of two insulated flues, the two insulated flues are not connected to each other, and the two insulated flues are respectively defined as a first insulated flue and a second insulated flue, The outlet of the first insulated flue is connected to the flue gas inlet of the economizer, a first flue gas damper valve is arranged on the first insulated flue, the flue gas outlet of the economizer is connected to the inlet of the bag filter, and the outlet of the bag filter is connected to the flare incineration system through the first induced draft fan; the smelting furnace, the first vaporization flue, the settling chamber, the cyclone dust collector, the second vaporization flue, the evaporator, the first insulated flue, the first flue gas damper valve, the economizer, the bag filter, the first induced draft fan and the flare incineration system together constitute a flue gas treatment system 1; The outlet of the second adiabatic flue is communicated with the inlet of the electrostatic precipitator, a second flue gas damper valve is arranged on the second adiabatic flue, the outlet of the electrostatic precipitator is communicated with the inlet of the second induced draft fan, the outlet of the second induced draft fan is divided into two paths for connecting the acid making system and the desulfurization system respectively, and a blower for supplying air to the first vaporization flue is arranged at the inlet of the first vaporization flue; the smelting furnace, the first vaporization flue, the blower, the settling chamber, the cyclone dust collector, the second vaporization flue, the evaporator, the second adiabatic flue, the second flue gas damper valve, the electrostatic precipitator and the second induced draft fan together constitute the second flue gas treatment system.

[0005] Further, the aforementioned multi-mode multi-purpose smelting furnace flue gas treatment system, wherein: includes a steam-water system for generating saturated steam, the steam-water system includes: a first feedwater pump, a steam drum, the inlet of the first feedwater pump is connected to the cooling water source, the outlet of the first feedwater pump is connected to the water inlet of the steam drum through a first pipeline, and a first valve is arranged on the first pipeline; The bottom water outlet of the steam drum is connected to the water inlet of the evaporator through a downcomer, and the steam outlet of the evaporator is connected to the steam inlet of the steam drum through an upcomer; The water inlet of the economizer is connected to the first pipeline before the first valve through the second pipeline, and a second valve is arranged on the second pipeline. The water outlet of the economizer is connected to the first pipeline after the first valve through the third pipeline, and a third valve is arranged on the third pipeline.

[0006] Furthermore, the aforementioned multi-operating-mode and multi-purpose smelting furnace flue gas treatment system, wherein: it also includes a second water supply pump, the inlet of the second water supply pump is connected to the water inlet pipeline through a fourth pipeline, and the outlet of the second water supply pump is connected to the first pipeline between the first valve and the first water supply pump through a fifth pipeline, so that the first water supply pump and the second water supply pump are connected in parallel, and the first water supply pump and the second water supply pump are used in parallel.

[0007] Furthermore, in the aforementioned multi-operating-mode and multi-purpose smelting furnace flue gas treatment system, an ash collecting device is respectively connected to the bottom of the settling chamber, the cyclone dust collector, the evaporator, the economizer, the bag dust collector, and the electrostatic precipitator, and the ash collecting device includes an ash bin, and star-shaped ash unloading valves are provided at the inlet and outlet of the ash bin.

[0008] Furthermore, in the aforementioned multi-operating-mode and multi-purpose smelting furnace flue gas treatment system, a water spraying device for flue gas temperature control in emergency situations is provided at the outlet of the first vaporization flue.

[0009] Furthermore, the aforementioned multi-mode and multi-purpose smelting furnace flue gas treatment system, wherein: the water spraying device includes: a spray pipe and a bypass pipe, one end of the spray pipe extends into the first vaporization flue, the other end of the spray pipe extends out of the first vaporization flue and is connected to the spraying water source through the first stop valve and the regulating valve in sequence, one end of the bypass pipe is connected to the spray pipe before the regulating valve, and the other end of the bypass pipe is connected to the spray pipe after the regulating valve.

[0010] Furthermore, in the aforementioned multi-operating-mode and multi-purpose smelting furnace flue gas treatment system, an explosion-proof pressure relief valve is provided on the second vaporization flue.

[0011] Furthermore, in the aforementioned multi-operating-mode and multi-purpose smelting furnace flue gas treatment system, the evaporator and the economizer both adopt the fire tube type.

[0012] Through the implementation of the above technical scheme, the beneficial effects of the present invention are: (1) the dry method is adopted to collect smoke dust, which is energy-saving and environmentally friendly; (2) the high-temperature flue gas of the smelting furnace can be efficiently recycled for waste heat, and the flue gas flow can be controlled according to the process requirements of different working conditions, so that different flue gas components can go to different process flows, and in the entire flue gas treatment process, it can be sealed and leak-free, with high safety and stability, and can be applicable to situations where the flue gas pressure is negative pressure, positive pressure, etc., and can be applicable to waste heat recovery treatment of toxic and harmful flue gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention provides a schematic diagram of the system flow of a multi-operating-mode and multi-purpose smelting furnace fume treatment system. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] like Figure 1 As shown, the multi-mode multi-purpose smelting furnace flue gas treatment system comprises a smelting furnace 1, the outlet of the smelting furnace 1 is connected to the inlet of the first vaporization flue 2, the outlet of the first vaporization flue 2 is connected to the flue gas inlet of the settling chamber 3, the flue gas outlet of the settling chamber 3 is connected to the inlet of the cyclone dust collector 4, the outlet of the cyclone dust collector 4 is connected to the inlet of the second vaporization flue 5, the outlet of the second vaporization flue 5 is connected to the flue gas inlet of the evaporator 6, the flue gas outlet of the evaporator 6 is simultaneously connected to the inlets of two insulated flues, the two insulated flues are not connected to each other, and the two insulated flues are respectively defined as a first insulated flue 7 and a second insulated flue, The outlet of the first insulated flue 7 is connected to the flue gas inlet of the economizer 9, a first flue gas damper valve 10 is arranged on the first insulated flue 7, the flue gas outlet of the economizer 9 is connected to the inlet of the bag filter 12 through the third insulated flue 11, and the outlet of the bag filter 12 is connected to the flare incineration system through the first induced draft fan; the smelting furnace 1, the first vaporization flue 2, the settling chamber 3, the cyclone dust collector 4, the second vaporization flue 5, the evaporator 6, the first insulated flue 7, the first flue gas damper valve 10, the economizer 9, the third insulated flue 11, the bag filter 12, the first induced draft fan 13 and the flare incineration system 14 together constitute a flue gas treatment system 1; The outlet of the second insulated flue 8 is connected to the inlet of the electrostatic precipitator 15, and a second flue gas damper valve 16 is arranged on the second insulated flue 8. The outlet of the electrostatic precipitator 15 is connected to the inlet of the second induced draft fan 18 through the fourth insulated flue 17. The outlet of the second induced draft fan 18 is divided into two paths for connecting the acid making system 19 and the desulfurization system 20 respectively. A blower 21 for supplying air to the first vaporization flue 2 is arranged at the inlet of the first vaporization flue 2; the smelting furnace 1, the first vaporization flue 2, the blower 21, the settling chamber 3, the cyclone dust collector 4, the second vaporization flue 5, the evaporator 6, the second insulated flue 8, the second flue gas damper valve 16, the electrostatic precipitator 15, the fourth insulated flue 17, and the second induced draft fan 18 together constitute a flue gas treatment system II; In this embodiment, a steam-water system for generating saturated steam is also included, and the steam-water system includes: a first water supply pump 22 and a steam drum 23, wherein the inlet of the first water supply pump 22 is connected to a cooling water source 24 via a water inlet pipeline 26, and the outlet of the first water supply pump 22 is connected to the water inlet of the steam drum 23 via a first pipeline 25, and a first valve 27 is provided on the first pipeline 25; The bottom water outlet of the steam drum 23 is connected to the water inlet of the evaporator 6 through a downcomer 28, and the steam outlet of the evaporator 6 is connected to the steam inlet of the steam drum 23 through an upcomer 29; The water inlet of the economizer 9 is connected to the first pipeline 25 before the first valve 27 through the second pipeline 30, and a second valve 31 is arranged on the second pipeline 30. The water outlet of the economizer 9 is connected to the first pipeline 25 after the first valve 27 through the third pipeline 32, and a third valve 33 is arranged on the third pipeline 32. In this embodiment, a second water supply pump 34 is further included, the inlet of the second water supply pump 34 is connected to the water inlet pipeline 26 through a fourth pipeline 35, and the outlet of the second water supply pump 34 is connected to the first pipeline 25 between the first valve 27 and the first water supply pump 22 through a fifth pipeline 36, so that the first water supply pump 22 and the second water supply pump 34 are connected in parallel, and the first water supply pump 22 and the second water supply pump 34 are used in a standby manner; In this embodiment, an ash collecting device is connected to the bottom of the settling chamber 3, the cyclone dust collector 4, the evaporator 6, the economizer 9, the bag filter 12, and the electrostatic precipitator 15, respectively. The ash collecting device includes: an ash bin, and a star-shaped ash discharge valve is provided at the inlet and outlet of the ash bin; specifically, the bottom of the settling chamber 3 is connected to the top inlet of the first ash bin 371, and a first star-shaped ash discharge valve 381 is provided at the top inlet of the first ash bin 371. The bottom outlet of the cyclone dust collector 4 is provided with a second star-shaped ash unloading valve 391; the bottom of the cyclone dust collector 4 is connected to the top inlet of the second ash bin 372, the top inlet of the second ash bin 372 is provided with a third star-shaped ash unloading valve 382, ​​and the bottom outlet of the second ash bin 372 is provided with a fourth star-shaped ash unloading valve 392; the bottom of the evaporator 6 is connected to the top inlet of the third ash bin 373, the top inlet of the third ash bin 373 is provided with a fifth star-shaped ash unloading valve 383, and the bottom outlet of the third ash bin 373 is provided with a fifth star-shaped ash unloading valve 383. The sixth star-shaped ash unloading valve 393 is provided at the outlet of the economizer 9; the bottom of the economizer 9 is connected to the top inlet of the fourth ash bin 374, the top inlet of the fourth ash bin 374 is provided with a seventh star-shaped ash unloading valve 384, and the bottom outlet of the fourth ash bin 374 is provided with an eighth star-shaped ash unloading valve 394; the bottom of the bag filter 12 is connected to the top inlet of the fifth ash bin 375, the top inlet of the fifth ash bin 375 is provided with a ninth star-shaped ash unloading valve 385, and the top inlet of the fifth ash bin 375 is provided with a ninth star-shaped ash unloading valve 385. The bottom outlet is provided with a tenth star-shaped ash discharge valve 395; the bottom of the electrostatic precipitator 15 is connected to the top inlet of the sixth ash bin 376, the top inlet of the sixth ash bin 376 is provided with an eleventh star-shaped ash discharge valve 386, and the bottom outlet of the sixth ash bin 376 is provided with a twelfth star-shaped ash discharge valve 396; the ash collection device of the present invention adopts the ash bin and star-shaped ash discharge valve design, which can further ensure that there will be no smoke leakage during the ash collection process, so that the entire system is airtight and leak-free; In this embodiment, a water spray device for controlling the flue gas temperature in an emergency is provided at the outlet of the first vaporization flue 2; the water spray device comprises: a spray pipe 40 and a bypass pipe 41, one end of the spray pipe 40 extends into the first vaporization flue 2, the other end of the spray pipe 40 extends out of the first vaporization flue 2 and is connected to a spray water source 44 through a first stop valve 42 and a regulating valve 43 in sequence, one end of the bypass pipe 41 is connected to the spray pipe 40 before the regulating valve 43, and the other end of the bypass pipe 41 is connected to the spray pipe 40 after the regulating valve 43; In this embodiment, an explosion-proof pressure relief valve 45 is provided on the second vaporization flue 5, which can further improve the safety of the system. In this embodiment, the evaporator 6 and the economizer 9 are both of fire tube type.

[0016] When the smoke treatment system 1 is used, the first smoke damper valve 10 is opened, and the second smoke damper valve 16 is closed; the blower 21 is closed; the first valve 27 is closed, the second valve 31 is opened, and the third valve 33 is opened; During operation, the high-temperature, dusty, and CO-containing flue gas generated by the smelting furnace 1 is cooled by the first vaporization flue 2, and the flue dust is settled in the settling chamber 3. The flue dust in the settling chamber 3 is discharged through the first star-shaped ash discharge valve 381, the first ash bin 371, and the second star-shaped ash discharge valve 391. After being settled in the settling chamber 3, the flue gas enters the high-temperature cyclone dust collector 4. After being dedusted by the high-temperature cyclone dust collector 4, the flue gas enters the evaporator 6 through the second vaporization flue 5. The flue dust collected by the high-temperature cyclone dust collector 4 is discharged through the third star-shaped ash discharge valve 382, ​​the second ash bin 372, and the fourth star-shaped ash discharge valve 392. The flue gas entering the shell side of the evaporator 6 exchanges heat with the cold water in the tube side of the evaporator 6, and then enters the economizer 9 through the first flue gas damper valve 10 and the first adiabatic flue 7. The The smoke is discharged through the fifth star-shaped ash discharge valve 383, the third ash bin 373 and the sixth star-shaped ash discharge valve 393; the smoke entering the shell side of the economizer 9 exchanges heat with the cold water in the tube side of the economizer 9, and then enters the bag filter 12 through the third adiabatic flue 11. The smoke collected in the shell side during the heat exchange of the economizer 9 is discharged through the seventh star-shaped ash discharge valve 384, the fourth ash bin 374 and the eighth star-shaped ash discharge valve 394; the smoke entering the bag filter 12 is dedusted by the bag filter 12, and then discharged into the flare incineration system 14 through the first induced draft fan 13. The smoke collected by the bag filter 12 is discharged through the ninth star-shaped ash discharge valve 385, the fifth ash bin 375 and the tenth star-shaped ash discharge valve 395; and after the smoke enters the flare incineration system 14, the flare incineration system 14 fully burns the smoke and then discharges it; During the operation of system 1, the first water supply pump 22 will continuously pump out cold water from the cooling water source 24, and pass the cold water into the economizer 9 pipe side through the water inlet pipe 26, the first pipe 25, the second valve 31, and the second pipe 30 in turn. The cold water passed into the economizer 9 pipe side is converted into hot water or a steam-water mixture after heat exchange with the flue gas passing through its shell side. The hot water or the steam-water mixture then enters the steam drum 23 through the third pipe 32, the third valve 33, and the first pipe 25 in turn. The lower layer of water in the steam drum 23 will continuously enter the pipe side of the evaporator 6 through the downcomer 28. The water passed into the evaporator 6 pipe side is converted into steam after heat exchange with the flue gas passing through its shell side. The water evaporates and is then passed into the steam drum 23 through the riser 29, thereby continuously generating saturated steam during the flue gas treatment process.

[0017] When the second flue gas treatment system is used, the first flue gas damper valve 10 is closed, and the second flue gas damper valve 16 is opened; the blower 21 is turned on; the first valve 27 is opened, the second valve 31 is closed, and the third valve 33 is closed; During operation, the high-temperature, dusty, sulfur-containing flue gas of the smelting furnace 1 is fully burned by the blower 21 at the entrance of the first vaporization flue 2. After cooling in the first vaporization flue 2, the flue dust is settled in the settling chamber 3. The flue dust in the settling chamber 3 is discharged through the first star-shaped ash discharge valve 381, the first ash bin 371 and the second star-shaped ash discharge valve 391. After settling in the settling chamber 3, the flue gas enters the high-temperature cyclone dust collector 4. After dust removal in the high-temperature cyclone dust collector 4, the flue gas enters the evaporator 6 through the second vaporization flue 5. The flue dust collected by the high-temperature cyclone dust collector 4 is discharged through the third star-shaped ash discharge valve 382, ​​the second ash bin 372 and the fourth star-shaped ash discharge valve 392. After the flue gas in the shell side of the evaporator 6 exchanges heat with the cold water in the tube side of the evaporator 6, it enters the electrostatic precipitator 15 through the second flue gas damper valve 16 and the second insulated flue 8. The smoke collected in the shell side during the heat exchange process of the evaporator 6 is discharged through the fifth star-shaped ash discharge valve 383, the third ash bin 373 and the sixth star-shaped ash discharge valve 393; the smoke collected in the electrostatic precipitator 15 is discharged through the eleventh star-shaped ash discharge valve 386, the sixth ash bin 376 and the twelfth star-shaped ash discharge valve 396; the flue gas after dust removal by the electrostatic precipitator 15 enters the second induced draft fan 18 through the fourth insulated flue 17, and enters the acid making system 19 and the desulfurization system 20 in two ways at the end of the second induced draft fan 18; During the operation of system two, the first water supply pump 22 will continuously pump out cold water from the cooling water source 24, and enter the steam drum 23 through the water inlet pipe 26 and the first pipe 25 in turn. The lower layer of water in the steam drum 23 will continuously enter the tube side of the evaporator 6 through the downcomer 28. The water entering the tube side of the evaporator 6 will be converted into steam after heat exchange with the flue gas passing through its shell side. The water will evaporate and then be passed into the steam drum 23 through the riser 29, thereby continuously generating saturated steam during the flue gas treatment process.

[0018] The advantages of the present invention are: (1) it adopts a dry method to collect smoke dust, which is energy-saving and environmentally friendly; (2) it can efficiently recover the waste heat of the high-temperature flue gas of the smelting furnace, control the flue gas flow according to the process requirements of different working conditions, and realize that different flue gas components go to different process flows. In addition, during the entire flue gas treatment process, it can be sealed and leak-free, with high safety and stability. It can be applicable to situations where the flue gas pressure is negative pressure, positive pressure, etc., and can be applicable to the waste heat recovery treatment of toxic and harmful flue gases.

[0019] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A multi-mode and multi-purpose smelting furnace flue gas treatment system, characterized by: The invention comprises a smelting furnace, wherein the outlet of the smelting furnace is connected to the inlet of a first vaporization flue, the outlet of the first vaporization flue is connected to the flue gas inlet of a settling chamber, the flue gas outlet of the settling chamber is connected to the inlet of a cyclone dust collector, the outlet of the cyclone dust collector is connected to the inlet of a second vaporization flue, the outlet of the second vaporization flue is connected to the flue gas inlet of an evaporator, the flue gas outlet of the evaporator is connected to the inlets of two insulated flues at the same time, the two insulated flues are not connected to each other, and the two insulated flues are respectively defined as a first insulated flue and a second insulated flue, The outlet of the first insulated flue is connected to the flue gas inlet of the economizer, a first flue gas damper valve is arranged on the first insulated flue, the flue gas outlet of the economizer is connected to the inlet of the bag filter, and the outlet of the bag filter is connected to the flare incineration system through the first induced draft fan; the smelting furnace, the first vaporization flue, the settling chamber, the cyclone dust collector, the second vaporization flue, the evaporator, the first insulated flue, the first flue gas damper valve, the economizer, the bag filter, the first induced draft fan and the flare incineration system together constitute a flue gas treatment system 1; The outlet of the second adiabatic flue is communicated with the inlet of the electrostatic precipitator, a second flue gas damper valve is arranged on the second adiabatic flue, the outlet of the electrostatic precipitator is communicated with the inlet of the second induced draft fan, the outlet of the second induced draft fan is divided into two paths for connecting the acid making system and the desulfurization system respectively, and a blower for supplying air to the first vaporization flue is arranged at the inlet of the first vaporization flue; the smelting furnace, the first vaporization flue, the blower, the settling chamber, the cyclone dust collector, the second vaporization flue, the evaporator, the second adiabatic flue, the second flue gas damper valve, the electrostatic precipitator and the second induced draft fan together constitute the second flue gas treatment system.

2. The multi-mode and multi-purpose smelting furnace flue gas treatment system according to claim 1 is characterized in that: A steam-water system for generating saturated steam is included, the steam-water system comprising: a first feedwater pump and a steam drum, the inlet of the first feedwater pump is connected to a cooling water source, the outlet of the first feedwater pump is connected to a water inlet of the steam drum through a first pipeline, and a first valve is arranged on the first pipeline; The bottom water outlet of the steam drum is connected to the water inlet of the evaporator through a downcomer, and the steam outlet of the evaporator is connected to the steam inlet of the steam drum through an upcomer; The water inlet of the economizer is connected to the first pipeline before the first valve through the second pipeline, and a second valve is arranged on the second pipeline. The water outlet of the economizer is connected to the first pipeline after the first valve through the third pipeline, and a third valve is arranged on the third pipeline.

3. The multi-mode and multi-purpose smelting furnace flue gas treatment system according to claim 2 is characterized in that: It also includes a second water supply pump, the inlet of the second water supply pump is connected to the water inlet pipeline through a fourth pipeline, and the outlet of the second water supply pump is connected to the first pipeline between the first valve and the first water supply pump through a fifth pipeline, so that the first water supply pump and the second water supply pump are connected in parallel, and the first water supply pump and the second water supply pump are used in parallel.

4. The multi-mode and multi-purpose smelting furnace flue gas treatment system according to claim 1 is characterized in that: An ash collecting device is respectively connected to the bottom of the settling chamber, the cyclone dust collector, the evaporator, the economizer, the bag dust collector, and the electrostatic precipitator. The ash collecting device includes an ash bin, and star-shaped ash discharge valves are arranged at the inlet and outlet of the ash bin.

5. The multi-mode and multi-purpose smelting furnace flue gas treatment system according to claim 1 is characterized in that: A water spray device for controlling the flue gas temperature in emergency situations is arranged at the outlet of the first vaporization flue.

6. The multi-mode and multi-purpose smelting furnace flue gas treatment system according to claim 5 is characterized in that: The water spraying device includes: a spray pipe and a bypass pipe, one end of the spray pipe extends into the first vaporization flue, the other end of the spray pipe extends out of the first vaporization flue and is connected to a spray water source through a first stop valve and a regulating valve in sequence, one end of the bypass pipe is connected to the spray pipe in front of the regulating valve, and the other end of the bypass pipe is connected to the spray pipe after the regulating valve.

7. The multi-mode and multi-purpose smelting furnace flue gas treatment system according to claim 1 is characterized by: An explosion-proof pressure relief valve is provided on the second vaporization flue.

8. The multi-mode and multi-purpose smelting furnace flue gas treatment system according to claim 1 is characterized by: The evaporator and economizer are of fire tube type.

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