A flue gas desulfurization purification device and method for thermal power plants

Abstract

The present invention discloses a flue gas desulfurization purification device for a thermal power plant, which relates to the technical field related to waste gas treatment, including a waste heat exchanger, a bag filter, an electrostatic precipitator, an SCR reactor, an optical magnetic resonator, a desulfurization tower, a fan and a chimney, and the exhaust end of the waste heat exchanger is connected to the air inlet end of the bag filter. The present invention also discloses a flue gas desulfurization purification method for a thermal power plant, which includes the following steps: A: heat recovery, B: primary dust removal, C: secondary dust removal, D: denitration reaction, E: optical magnetic resonance, and F: wet desulfurization. The present invention uses two dust removals of bag filter and electrostatic filter in sequence, which greatly reduces the concentration of impurities in the flue gas, solves the ash blocking problem of subsequent equipment, reduces the harm of heavy metal ions, reduces the concentration of harmful substances in the flue gas, and thus reduces the purification pressure of subsequent equipment, directly accelerates the reaction rate of the SCR reactor, the optical magnetic resonator and the desulfurization tower, and improves the purification effect of the device.

Description

Technical Field

[0001] The present invention relates to the technical field related to waste gas treatment, and in particular to a flue gas desulfurization purification device and method for a thermal power plant. Background Art

[0002] In recent years, with the increasingly stringent environmental regulations and the gradual increase in fuel prices, energy conservation and environmental protection have received widespread attention, and higher requirements have been put forward for the standard emission of high-temperature flue gas in thermal power plants and energy conservation and consumption reduction in flue gas treatment. In particular, the emission of NOx in flue gas has attracted great attention from the society. In addition to traditional dust removal and desulfurization treatment, flue gas also needs to be denitrified to ensure that both SO2 and NOx can meet the emission standards. The existing flue gas desulfurization purification device has a relatively simple function of the heat exchanger. When the internal pipe of the heat exchanger is blocked or leaked, the entire device will not work. The bag filter is inconvenient to install and replace the filter bag, and it is time-consuming and laborious to clean or replace the filter bag after long-term use.

[0003] In the Chinese invention patent application number: CN201110319129.5, a method for dust removal, denitration and desulfurization of flue gas in a thermal power plant is disclosed. The high-temperature raw flue gas is first dusted by a bag filter and then passed into an SCR reactor for selective catalytic reduction and denitration. Then, the flue gas is cooled to 90-100°C by an air preheater and a heat exchanger in sequence, and then enters a desulfurization tower for wet desulfurization. The desulfurized flue gas discharged from the desulfurization tower is heated to 100-105°C by a heat exchanger and then discharged into a chimney. The ash blocking problem that is easy to occur in the equipment in the method for dust removal, denitration and desulfurization of flue gas in a thermal power plant affects the reaction rate of the device, thereby reducing the purification effect of the device.

[0004] Therefore, it is necessary to propose a flue gas desulfurization purification device and method for thermal power plants to solve the above problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a flue gas desulfurization purification device and method for a thermal power plant, which solves the problems of the existing flue gas desulfurization purification device and method. The heat exchanger has a relatively single function. When the internal pipeline of the heat exchanger is blocked or leaks, the entire device will not work. The bag filter is inconvenient to install and replace the filter bags, which is time-consuming and laborious when the filter bags need to be cleaned or replaced after long-term use. The equipment is prone to dust blockage, which affects the reaction rate of the device.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A flue gas desulfurization purification device for a thermal power plant, comprising a waste heat exchanger, a bag filter, an electrostatic precipitator, an SCR reactor, an optical magnetic resonator, a desulfurization tower, a fan and a chimney, wherein the exhaust end of the waste heat exchanger is connected to the air inlet end of the bag filter, the exhaust end of the bag filter is connected to the air inlet end of the electrostatic precipitator, the exhaust end of the electrostatic precipitator is connected to the air inlet end of the SCR reactor, the exhaust end of the SCR reactor is connected to the air inlet end of the optical magnetic resonator, the exhaust end of the optical magnetic resonator is connected to the air inlet end of the desulfurization tower, the exhaust end of the desulfurization tower is connected to the air inlet end of the fan, and the exhaust end of the fan is connected to the air inlet end of the chimney;

[0008] A gas inlet is provided at one end of the waste heat exchanger, a gas outlet is provided at the other side of the waste heat exchanger, and heat exchange tubes are provided at both upper and lower ends of the waste heat exchanger;

[0009] The top of the bag filter is provided with a toothed plate, and the toothed plate is meshed with the toothed plate.

[0010] Optionally, there are multiple heat exchange tubes, and the multiple heat exchange tubes are arranged linearly, and a solenoid valve is provided inside the heat exchange tube.

[0011] Optionally, both ends of the heat exchange tube are fixedly connected to the outer side with mounting buckles, and the mounting buckles are composed of two semi-ring bodies, one end of the two semi-ring bodies is hinged, and the other ends of the two semi-ring bodies are connected by locking buckles, and the outer side of one of the semi-ring bodies is fixedly connected to the inner wall of the waste heat exchanger.

[0012] Optionally, one end of the heat exchange tube is connected to a liquid inlet pipe, and the other end of the heat exchange tube is connected to a liquid outlet pipe.

[0013] Optionally, the size of the side door is larger than the size of the filter bag, and the side door is sealed and connected to the bag filter.

[0014] Optionally, there are multiple through holes, and the multiple through holes are distributed in a circular array. The diameter of the through hole is the same as the diameter of the filter cloth at the lower end of the filter bag, and the diameter of the slide groove is the same as the diameter of the fixing ring at the top end of the filter bag.

[0015] Optionally, the filter cloth of the filter bag is a mixed fiber felt formed by cross-laying a PBO fiber mesh and a basalt fiber mesh.

[0016] A method for desulfurization and purification of flue gas for thermal power plants comprises the following steps:

[0017] A: Heat recovery: The sulfur-containing flue gas with a temperature above 350°C generated by the boiler in the thermal power plant is passed into the waste heat exchanger to cool the sulfur-containing flue gas, so that the temperature of the sulfur-containing flue gas is reduced by 70 to 90°C;

[0018] B: Primary dust removal: The sulfur-containing flue gas with a temperature of 70-90°C is introduced into the bag filter for dust removal. The sulfur-containing flue gas passes through the filter bag for primary dust removal.

[0019] C: Secondary dust removal: After being dedusted by the bag filter, the sulfur-containing flue gas is passed into the electrostatic precipitator for dust removal. The electrostatic precipitator uses a high-voltage electric field to ionize the flue gas. The charged dust in the airflow is separated from the airflow under the action of the electric field, and secondary dust removal is performed.

[0020] D: Denitrification reaction: The sulfur-containing flue gas that has been filtered twice is placed in the SCR reactor for selective catalytic reduction denitrification;

[0021] E: Photomagnetic resonance: The sulfur-containing flue gas after denitrification is introduced into the photomagnetic resonator. Under the condition of photomagnetic resonance, the sulfur dioxide molecules in the flue gas undergo energy level transition after being irradiated by the laser, so that the S and O in some sulfur dioxide molecules dissociate and decompose into oxygen and elemental sulfur.

[0022] F: Wet desulfurization: The sulfur-containing flue gas is introduced into the desulfurization tower after optical magnetic resonance. The flue gas and the sodium hydroxide absorption liquid in the desulfurization tower undergo gas-liquid two-phase contact absorption and neutralization reaction. After being purified, the sulfur-containing flue gas is dehydrated and defogged by the defogger plate, and then drawn into the chimney by the fan and discharged into the atmosphere from the chimney.

[0023] The present invention provides a flue gas desulfurization purification device and method for a thermal power plant, which has the following beneficial effects:

[0024] 1. The present invention utilizes a plurality of heat exchange tubes to recover heat from flue gas. With the cooperation of the plurality of heat exchange tubes, on the one hand, not only the temperature and flow rate of the coolant inside the heat exchange tubes can be controlled, but also the number of heat exchange tubes can be selectively opened, so as to control the rate of heat recovery and thus facilitate the control of the exhaust temperature of the flue gas. On the other hand, since the plurality of heat exchange tubes can be selectively opened, the problem of the entire device being unable to work due to pipe blockage or leakage is solved.

[0025] 2. The present invention facilitates the installation and replacement of filter bags by arranging a bag dust collector and coordinating the side doors, support columns, fixed plates, cylinders, push plates, servo motors, gears, mounting plates, through holes, slides, push grooves, gear rings and inner slides. When the filter bags need to be cleaned or replaced after long-term use, it saves time and effort, reduces work difficulty and improves work efficiency.

[0026] 3. The flue gas purification method of the present invention, through two dust removals of bag dust removal and electrostatic dust removal in sequence, greatly reduces the concentration of impurities in the flue gas, solves the ash blockage problem of subsequent equipment and reduces the harm of heavy metal ions, reduces the concentration of harmful substances in the flue gas, and thus reduces the purification pressure of subsequent equipment, directly accelerates the reaction rate of the SCR reactor, optical magnetic resonator and desulfurization tower, and improves the purification effect of the device.

[0027] 4. The present invention utilizes optical magnetic resonance to dissociate sulfur dioxide molecules in flue gas into oxygen and elemental sulfur, thereby reducing sulfur content and improving the processing capacity of the entire system.

[0028] 5. The present invention not only occupies a small area of ​​equipment, but also has good treatment effect and very low operation and maintenance costs, which is conducive to large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the desulfurization purification device of the present invention;

[0030] Figure 2 is a cross-sectional schematic diagram of a waste heat exchanger of the present invention;

[0031] Figure 3 It is a cross-sectional schematic diagram of the bag filter of the present invention;

[0032] Figure 4 It is a top view schematic diagram of the mounting plate structure of the present invention;

[0033] Figure 5 It is a top cross-sectional schematic diagram of the mounting plate structure of the present invention;

[0034] Figure 6 It is a schematic diagram of the process of the desulfurization purification method of the present invention.

[0035] In the figure: 1-waste heat exchanger, 11-gas inlet, 12-gas outlet, 13-heat exchange tube, 14-mounting buckle, 2-bag filter, 21-air inlet, 22-exhaust port, 23-side door, 24-support column, 25-fixed plate, 26-cylinder, 27-push plate, 28-servo motor, 29-gear, 3-electrostatic precipitator, 4-SCR reactor, 5-optical magnetic resonator, 6-desulfurization tower, 7-fan, 8-chimney, 9-mounting plate, 91-through hole, 92-slideway, 93-push slot, 94-filter bag, 95-gear ring, 96-inner slideway. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "left", "right", "top", "bottom", "inside", "outside", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] According to Figure 6 As shown, the present invention provides a technical solution:

[0040] A flue gas desulfurization purification device for a thermal power plant, comprising a waste heat exchanger 1, a bag filter 2, an electrostatic precipitator 3, an SCR reactor 4, an optical magnetic resonator 5, a desulfurization tower 6, a fan 7 and a chimney 8, wherein the exhaust end of the waste heat exchanger 1 is connected to the air inlet end of the bag filter 2, the exhaust end of the bag filter 2 is connected to the air inlet end of the electrostatic precipitator 3, the exhaust end of the electrostatic precipitator 3 is connected to the air inlet end of the SCR reactor 4, the exhaust end of the SCR reactor 4 is connected to the air inlet end of the optical magnetic resonator 5, the exhaust end of the optical magnetic resonator 5 is connected to the air inlet end of the desulfurization tower 6, the exhaust end of the desulfurization tower 6 is connected to the air inlet end of the fan 7, and the exhaust end of the fan 7 is connected to the air inlet end of the chimney 8;

[0041] A gas inlet 11 is provided at one end of the waste heat exchanger 1, and a gas outlet 12 is provided at the other side of the waste heat exchanger 1. Heat exchange tubes 13 are provided at both upper and lower ends of the waste heat exchanger 1. There are multiple heat exchange tubes 13, and the multiple heat exchange tubes 13 are arranged linearly. A solenoid valve is provided inside the heat exchange tube 13. The outer sides of both ends of the heat exchange tube 13 are fixedly connected with mounting buckles 14. The mounting buckle 14 consists of two semi-ring bodies, one end of the two semi-ring bodies is hinged, and the other ends of the two semi-ring bodies are connected by a lock buckle, and the outer side of one of the semi-ring bodies is fixedly connected to the inner wall of the waste heat exchanger 1. One end of the heat exchange tube 13 is connected to a liquid inlet pipe, and the other end of the heat exchange tube 13 is connected to a liquid outlet pipe. The heat of the flue gas is recovered by using multiple heat exchange tubes 13. Under the cooperation of the multiple heat exchange tubes 13, on the one hand, not only the temperature and flow rate of the coolant inside the heat exchange tube 13 can be controlled, but also the number of heat exchange tubes 13 can be selectively opened, so as to control the rate of heat recovery and thus the exhaust temperature of the flue gas. On the other hand, since the multiple heat exchange tubes 13 can be selectively opened, the problem of the entire device being unable to work due to pipe blockage or leakage is solved.

[0042] An air inlet 21 is provided on one side of the bag-type dust collector 2, a side door 23 is provided on the other side of the bag-type dust collector 2, an exhaust port 22 is provided on the top of the bag-type dust collector 2, a support column 24 is fixedly connected to the middle of the bottom end of the bag-type dust collector 2, a fixed plate 25 is fixedly connected to the top end of the support column 24, a cylinder 26 is fixedly connected to the middle of the top end of the fixed plate 25, a push plate 27 is fixedly connected to the piston rod of the cylinder 26, a servo motor 28 is fixedly connected to one side of the top end of the fixed plate 25, and a gear 29 is fixedly connected to the output shaft of the servo motor 28. A mounting plate 9 is provided on the outer side of the fixed plate 25, and an inner slideway 96 is provided at the inner lower end of the mounting plate 9. The mounting plate 9 is movably connected to the fixed plate 25 through the inner slideway 96. A gear ring 95 is fixedly connected to the inner upper end of the mounting plate 9, and the gear ring 95 is meshed with the gear 29. A through hole 91 is provided in the circumference of the mounting plate 9, and slide grooves 92 are provided on both sides of the through hole 91. A push groove 93 is provided at one end of the through hole 91, and the push groove 93 is adapted to the push plate 27. A filter bag 94 is provided in the slide groove 92. The filter cloth of the filter bag 94 is a mixed fiber felt cross-laid by a PBO fiber mesh and a basalt fiber mesh. The size of the side door 23 is larger than that of the filter bag 94. The side door 23 is sealed and connected to the bag dust collector 2. There are multiple through holes 91, and the multiple through holes 91 are distributed in a ring array. The diameter of the through hole 91 is the same as the diameter of the filter cloth at the lower end of the filter bag 94, and the diameter of the slide groove 92 is the same as the diameter of the fixing ring at the top of the filter bag 94.

[0043] When the filter bag 94 in the bag filter 2 needs to be replaced, the side door 23 is opened, and then the servo motor 28 is started. The servo motor 28 drives the electric mounting plate 9 to rotate through the gear 29 and the gear ring 95. The mounting plate 9 rotates along the fixed plate 25 through the inner slide 96, and the filter bag 94 to be replaced is rotated to correspond to the side door 23. At this time, the push groove 93 corresponds to the push plate 27. The servo motor 28 is stopped, and then the cylinder 26 is started. The cylinder 26 drives the push plate 27 to move. The push plate 27 extends into the push groove 93 to push the filter bag 94 out of the through hole 91 and the slide groove 92, and then passes through the side door. 23, remove the filter bag 94, install the new filter bag 94 into the through hole 91 and the slide groove 92, close the side door 23, and complete the replacement of the filter bag 94. By setting the bag dust collector 2, as well as the side door 23, the support column 24, the fixed plate 25, the cylinder 26, the push plate 27, the servo motor 28, the gear 29, the mounting plate 9, the through hole 91, the slide groove 92, the push groove 93, the gear ring 95 and the inner slide 96, it is convenient to install and replace the filter bag 94. When the filter bag 94 needs to be cleaned or replaced after long-term use, it is more time-saving and labor-saving, reduces the difficulty of work, and improves work efficiency.

[0044] According to Figure 1-5 As shown, the present invention provides a technical solution:

[0045] A method for desulfurization and purification of flue gas for thermal power plants comprises the following steps:

[0046] A: Heat recovery: The sulfur-containing flue gas with a temperature above 350°C generated by the boiler in the thermal power plant is passed into the waste heat exchanger to cool the sulfur-containing flue gas, so that the temperature of the sulfur-containing flue gas is reduced by 80°C;

[0047] B: Primary dust removal: The sulfur-containing flue gas with a temperature of 80°C is introduced into the bag filter for dust removal. The sulfur-containing flue gas passes through the filter bag for primary dust removal.

[0048] C: Secondary dust removal: After being dedusted by the bag filter, the sulfur-containing flue gas is passed into the electrostatic precipitator for dust removal. The electrostatic precipitator uses a high-voltage electric field to ionize the flue gas. The charged dust in the airflow is separated from the airflow under the action of the electric field, and secondary dust removal is performed.

[0049] D: Denitrification reaction: The sulfur-containing flue gas that has been filtered twice is placed in the SCR reactor for selective catalytic reduction denitrification;

[0050] E: Photomagnetic resonance: The sulfur-containing flue gas after denitrification is introduced into the photomagnetic resonator. Under the condition of photomagnetic resonance, the sulfur dioxide molecules in the flue gas undergo energy level transition after being irradiated by the laser, so that the S and O in some sulfur dioxide molecules dissociate and decompose into oxygen and elemental sulfur.

[0051] F: Wet desulfurization: The sulfur-containing flue gas is introduced into the desulfurization tower after optical magnetic resonance. The flue gas and the sodium hydroxide absorption liquid in the desulfurization tower undergo gas-liquid two-phase contact absorption and neutralization reaction. After being purified, the sulfur-containing flue gas is dehydrated and defogged by the defogger plate, and then drawn into the chimney by the fan and discharged into the atmosphere from the chimney.

[0052] In summary: the flue gas desulfurization purification method used in the thermal power plant, through two dust removals of bag dust removal and electrostatic dust removal in sequence, greatly reduces the concentration of impurities in the flue gas, solves the ash blockage problem of subsequent equipment and reduces the harm of heavy metal ions, reduces the concentration of harmful substances in the flue gas, and thus reduces the purification pressure of subsequent equipment, directly accelerates the reaction rate of the SCR reactor 4, the optical magnetic resonator 5 and the desulfurization tower 6, improves the purification effect of the device, and utilizes the optical magnetic resonance method to dissociate the sulfur dioxide molecules in the flue gas into oxygen and elemental sulfur, thereby reducing the sulfur content and improving the processing capacity of the entire system. The present invention not only has a small equipment footprint, but also has good processing effect and low operation and maintenance costs, which is conducive to large-scale promotion and application.

[0053] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flue gas desulfurization purification device for a thermal power plant, comprising a waste heat exchanger (1), a bag filter (2), an electrostatic precipitator (3), an SCR reactor (4), an optical magnetic resonator (5), a desulfurization tower (6), a fan (7) and a chimney (8), characterized in that: The exhaust end of the waste heat exchanger (1) is connected to the air inlet end of the bag filter (2), the exhaust end of the bag filter (2) is connected to the air inlet end of the electrostatic precipitator (3), the exhaust end of the electrostatic precipitator (3) is connected to the air inlet end of the SCR reactor (4), the exhaust end of the SCR reactor (4) is connected to the air inlet end of the optical magnetic resonator (5), the exhaust end of the optical magnetic resonator (5) is connected to the air inlet end of the desulfurization tower (6), the exhaust end of the desulfurization tower (6) is connected to the air inlet end of the fan (7), and the exhaust end of the fan (7) is connected to the air inlet end of the chimney (8); A gas inlet (11) is provided at one end of the waste heat exchanger (1), a gas outlet (12) is provided at the other side of the waste heat exchanger (1), and heat exchange tubes (13) are provided at both upper and lower ends of the waste heat exchanger (1); An air inlet (21) is provided on one side of the bag filter (2), a side door (23) is provided on the other side of the bag filter (2), an exhaust port (22) is provided at the top of the bag filter (2), a support column (24) is fixedly connected to the middle of the bottom end of the bag filter (2), a fixed plate (25) is fixedly connected to the top end of the support column (24), a cylinder (26) is fixedly connected to the middle of the top end of the fixed plate (25), a piston rod of the cylinder (26) is fixedly connected to a push plate (27), a servo motor (28) is fixedly connected to one side of the top end of the fixed plate (25), a gear (29) is fixedly connected to the output shaft of the servo motor (28), a mounting plate (9) is provided on the outer side of the fixed plate (25), and an inner slideway (96) is provided at the inner lower end of the mounting plate (9). The mounting plate (9) is movably connected to the fixed plate (25) via an inner slideway (96); a gear ring (95) is fixedly connected to the inner upper end of the mounting plate (9); the gear ring (95) is meshingly connected to the gear (29); a through hole (91) is provided in the circumferential direction of the mounting plate (9); slide grooves (92) are provided on both sides of the through hole (91); a push groove (93) is provided at one end of the through hole (91); the push groove (93) is matched with the push plate (27); a filter bag (94) is provided in the slide groove (92); there are a plurality of heat exchange tubes (13), the plurality of heat exchange tubes (13) are linearly arranged, and a solenoid valve is provided inside the heat exchange tube (13); one end of the heat exchange tube (13) is connected to a liquid inlet pipe, and the other end of the heat exchange tube (13) is connected to a liquid outlet pipe.

2. The flue gas desulfurization purification device for a thermal power plant according to claim 1, characterized in that: The outer sides of both ends of the heat exchange tube (13) are fixedly connected with mounting buckles (14), and the mounting buckles (14) are composed of two semi-ring bodies, one end of the two semi-ring bodies is hinged, and the other ends of the two semi-ring bodies are connected by a lock buckle, and the outer side of one of the semi-ring bodies is fixedly connected to the inner wall of the waste heat exchanger (1).

3. The flue gas desulfurization purification device for a thermal power plant according to claim 1, characterized in that: The size of the side door (23) is larger than the size of the filter bag (94), and the side door (23) is sealedly connected to the bag filter (2).

4. The flue gas desulfurization purification device for a thermal power plant according to claim 1, characterized in that: There are a plurality of through holes (91), which are distributed in a ring array. The diameter of the through holes (91) is the same as the diameter of the filter cloth at the lower end of the filter bag (94), and the diameter of the slide groove (92) is the same as the diameter of the fixing ring at the top end of the filter bag (94).

5. The flue gas desulfurization purification device for a thermal power plant according to claim 1, characterized in that: The filter cloth of the filter bag (94) is a mixed fiber felt formed by cross-laying a PBO fiber mesh and a basalt fiber mesh.

6. A method for desulfurization and purification of flue gas for thermal power plants, using a flue gas desulfurization and purification device for thermal power plants as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: A: Heat recovery: The sulfur-containing flue gas with a temperature above 350°C generated by the boiler in the thermal power plant is passed into the waste heat exchanger to cool the sulfur-containing flue gas, so that the temperature of the sulfur-containing flue gas is reduced by 70 to 90°C; B: Primary dust removal: The sulfur-containing flue gas with a temperature of 70-90°C is introduced into the bag filter for dust removal. The sulfur-containing flue gas passes through the filter bag for primary dust removal. C: Secondary dust removal: After being dedusted by the bag filter, the sulfur-containing flue gas is passed into the electrostatic precipitator for dust removal. The electrostatic precipitator uses a high-voltage electric field to ionize the flue gas. The charged dust in the airflow is separated from the airflow under the action of the electric field, and secondary dust removal is performed. D: Denitrification reaction: The sulfur-containing flue gas that has been filtered twice is placed in the SCR reactor for selective catalytic reduction denitrification; E: Photomagnetic resonance: The sulfur-containing flue gas after denitrification is introduced into the photomagnetic resonator. Under the condition of photomagnetic resonance, the sulfur dioxide molecules in the flue gas undergo energy level transition after being irradiated by the laser, so that the S and O in some sulfur dioxide molecules dissociate and decompose into oxygen and elemental sulfur. F: Wet desulfurization: The sulfur-containing flue gas is introduced into the desulfurization tower after optical magnetic resonance. The flue gas and the sodium hydroxide absorption liquid in the desulfurization tower undergo gas-liquid two-phase contact absorption and neutralization reaction. After being purified, the sulfur-containing flue gas is dehydrated and defogged by the defogger plate, and then drawn into the chimney by the fan and discharged into the atmosphere from the chimney.

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