A low-energy consumption wet desulfurization device and method for thermal power plants

Abstract

The invention discloses a low-energy consumption wet desulfurization device and method for a thermal power plant, and relates to the technical field of wet desulfurization, comprising an oxidation desulfurization component, which is connected to a flue gas conveying system, the flue gas conveying system is connected to a flue gas manufacturing device, the oxidation desulfurization component is also connected to a slurry circulation component and a clean water circulation component, and a flue gas outlet is arranged at the upper end of the oxidation desulfurization component; the oxidation desulfurization component comprises a fixed reaction tower, in which a gas filter plate, a clean water return plate, a slurry drop plate and a closed plate are horizontally fixedly arranged in sequence from top to bottom in the fixed reaction tower, and fixed spray groups are arranged on and below the gas filter plate and below the clean water return plate in the fixed reaction tower; the flue gas treatment efficiency can be further improved, the energy consumption of the device can be reduced, the slurry and water can be recycled, and the treatment cost can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of wet desulfurization, and in particular to a low-energy consumption wet desulfurization device and method for a thermal power plant. Background Art

[0002] Wet desulfurization technology is to use slurry with added absorbent to treat sulfur dioxide in flue gas under wet conditions. This technology can be divided into many types according to the different desulfurization processes, among which the most common and widely used is the limestone-calcium carbonate method. In addition, there are magnesium oxide method, seawater method, etc. The working principle of wet desulfurization equipment is mainly based on absorption method and chemical reaction. Taking the limestone-calcium carbonate method as an example, this process uses limestone as a desulfurization absorbent, and the limestone is crushed and mixed with water through a wet grinding system to make limestone slurry. In the absorption tower, the sulfur dioxide in the flue gas reacts chemically with the calcium carbonate in the slurry and the oxidizing air blown in to generate calcium sulfate, thereby removing sulfur dioxide from the flue gas.

[0003] However, as the reaction proceeds, the slurry concentration in the absorption tower will decrease, thereby reducing the reaction speed and reaction degree, and further reducing the sulfur dioxide treatment efficiency and treatment quality, and to a large extent increasing energy consumption and raising treatment costs. At the same time, the desulfurization product calcium sulfate will not only affect the desulfurization efficiency, but also form scale, causing blockage, thereby increasing treatment costs and even damaging the device.

[0004] Therefore, it is necessary to provide a low-energy consumption wet desulfurization device for a thermal power plant to solve the above problems. Summary of the invention

[0005] To achieve the above object, the present invention provides the following technical solution: a low energy consumption wet desulfurization device for a thermal power plant, comprising:

[0006] An oxidative desulfurization component is connected to a flue gas delivery system, the flue gas delivery system is connected to a flue gas production device, the oxidative desulfurization component is also connected to a slurry circulation component and a clean water circulation component, and a flue gas outlet is provided at the upper end of the oxidative desulfurization component;

[0007] The oxidation desulfurization assembly comprises a fixed reaction tower, in which a gas filter plate, a clean water return plate, a slurry drop plate and a closed plate are fixedly arranged horizontally from top to bottom, and a fixed spray group is arranged above and below the gas filter plate and below the clean water return plate in the fixed reaction tower;

[0008] Further, as a preference, the slurry circulation component includes a fixed support frame, and a used slurry impurity removal component, a slurry configuration component and a slurry carrying tank are fixedly arranged on the upper surface of the bottom of the fixed support frame, and the used slurry impurity removal component, the slurry configuration component and the lower ends of the slurry carrying tank are connected to a water pump, and the output ends of the water pump corresponding to the used slurry impurity removal component and the slurry configuration component are respectively connected to the slurry configuration component and the slurry carrying tank through two groups of circulating water regulating pipes, a used slurry input pipe is arranged on the upper end of the used slurry impurity removal component, and the other end of the used slurry input pipe is arranged at the bottom of the closed reaction space, and the output end of the water pump corresponding to the slurry carrying tank is connected to the fixed spray group below the clean water return plate through an intact slurry output pipe.

[0009] Further, as a preference, a plurality of groups of desulfurization gas output pipes are fixedly provided on the upper surface of the closed plate, a plurality of groups of flue gas input pipes are fixedly provided on the lower surface, and the closed plate is provided with through holes corresponding to the desulfurization gas output pipe and the flue gas input pipe, so that one end of the desulfurization gas output pipe and the flue gas input pipe are arranged in the corresponding through holes, and the other end of the desulfurization gas output pipe passes through the slurry falling plate and the clean water return plate to between the clean water return plate and the fixed spray group below the gas filter plate.

[0010] Further, as a preference, the sealing plate and the lower part of the fixed reaction tower constitute a closed reaction space, inside which a first stirring blade is rotatably arranged, the first stirring blade is arranged below the multiple groups of flue gas inlet pipes, and is fixedly assembled on the output shaft of a first drive motor, the first drive motor is fixedly assembled on the lower surface of the fixed reaction tower, the lower surface of the fixed reaction tower is also fixedly assembled with an oxygen generator, and the output end of the oxygen generator is arranged in the closed reaction space.

[0011] Furthermore, preferably, the slurry falling plate is a plate inclined toward the flue gas conveying system side, and a slurry falling pipe is arranged at the lowest point of the inclination of this side, the lower end of the slurry falling pipe passes through a sealed plate and is arranged in a closed reaction space, and there is a flue gas falling gap between the side of the slurry falling plate away from the flue gas conveying system and the fixed reaction tower.

[0012] Further, as a preference, no spray nozzle is provided at the position of the fixed spray group arranged below the clean water return plate corresponding to the flue gas falling gap.

[0013] Further, as a preference, the used slurry impurity removal component includes a slurry impurity removal tank, a scale attachment device is arranged inside the slurry impurity removal tank, the scale attachment device is coaxially fixedly assembled on the lower end of the multi-stage telescopic rod, the upper end of the multi-stage telescopic rod is fixedly assembled on the temperature regulator, the temperature regulator is fixedly assembled on the upper surface of the fixed support frame, and an ultrasonic cleaner is arranged at the lower end of the temperature regulator, and the ultrasonic cleaner is fixedly arranged on the lower surface of the upper end of the fixed support frame.

[0014] Further, as a preference, the slurry configuration component comprises a slurry preparation tank, a second stirring blade is arranged inside the slurry preparation tank, the second stirring blade is coaxially fixedly assembled on the lower end of the transmission shaft, the upper end of the transmission shaft is fixedly assembled on the transmission belt, the other end of the transmission belt is arranged on the upper end of the second drive motor, and the second drive motor is fixedly assembled on the upper surface of the fixed support frame;

[0015] The limestone crusher is fixedly mounted on the fixed support frame, and the output port at the lower end thereof is located just above the feed port opened on the slurry preparation tank.

[0016] Further, preferably, the clean water circulation component comprises:

[0017] A clean water tank, the lower end of which is connected to the input end of a high-pressure water pump, and the output end of the high-pressure water pump is connected to two fixed spray groups arranged above and below the gas filter plate through a clean water output pipe;

[0018] The upper end of the clean water tank is connected to the output end of the water filter, and the input end of the water filter is connected to the reflux hole opened on the lower surface of the clean water reflux plate through a water reflux pipe;

[0019] The upper end of the clean water tank is also connected with a water supply device.

[0020] A low-energy consumption wet desulfurization method for a thermal power plant comprises the following steps:

[0021] S1. According to the injection amount of sulfur-containing flue gas, the slurry is sequentially injected into the closed reaction space through the slurry circulation assembly, the fixed spray group below the clean water return plate, the slurry drop plate and the slurry drop pipe, wherein the slurry height in the closed reaction space is higher than the flue gas inlet pipe;

[0022] S2. The flue gas delivery system inputs sulfur-containing flue gas into the oxidation desulfurization component, and the first drive motor, oxygen generator, slurry circulation component and clean water circulation component are turned on;

[0023] S3. The flue gas enters the fixed reaction tower and reacts with the slurry sprayed by the fixed spray group under the clean water reflux plate, while removing the dust in the flue gas;

[0024] S4. The flue gas that reacts first falls into the closed reaction space with the slurry through the slurry drop plate and the slurry drop pipe in sequence, and the unreacted flue gas passes through the flue gas drop gap and the flue gas input pipe in sequence and directly enters the slurry in the closed reaction space;

[0025] S5. The oxygen generator introduces sufficient oxygen into the slurry, and under the stirring of the first stirring blade, the sulfur dioxide in the flue gas reacts chemically with the calcium carbonate in the slurry and the oxygen blown in to generate calcium sulfate, thereby removing the sulfur dioxide in the flue gas;

[0026] S6. Other gases in the flue gas pass through the desulfurized gas output pipe, are sprayed by the fixed spray group below the gas filter plate, filtered by the gas filter plate, and sprayed by the fixed spray group above the gas filter plate, and then are discharged from the device through the flue gas outlet;

[0027] S7. The slurry in the closed reaction space is input into the used slurry impurity removal component through the used slurry input pipe, and the used slurry impurity removal component removes calcium sulfate in the used slurry to decompose and precipitate it;

[0028] S8. The treated used slurry is introduced into the slurry configuration assembly for reconfiguration, and then the configured solution is introduced into the slurry carrying tank so that it can be reused through the intact slurry output pipe;

[0029] S9. The clean water sprayed by the fixed spray groups above and below the gas filter plate passes through the clean water return plate and the clean water output pipe, and is stored in the clean water tank after being filtered by the water filter. During operation, it is input to the corresponding fixed spray group through the high-pressure water pump and the clean water output pipe.

[0030] Compared with the prior art, the present invention provides a low-energy consumption wet desulfurization device and method for a thermal power plant, which has the following beneficial effects:

[0031] In the present invention, an oxidation desulfurization component is provided to remove sulfur dioxide from flue gas, a slurry circulation component can continuously inject slurry of appropriate concentration into the oxidation desulfurization component, and recover the slurry discharged from the oxidation desulfurization component, while ensuring the desulfurization efficiency, further reducing the processing cost, the clean water circulation component can further process the flue gas after desulfurization to prevent it from being entrained in the slurry discharge device and causing pollution to the environment, and at the same time increase the water content of the flue gas so that the air quality can be further improved after it is discharged.

[0032] In the present invention, the sealed plate and the lower part of the fixed reaction tower constitute a closed reaction space. The molding of the closed reaction space can maintain the reaction conditions of the slurry to the greatest extent while preventing the leakage of sulfur-containing gas. In addition, a first stirring blade and an oxygen generator are provided to accelerate the reaction rate of the slurry and sulfur dioxide, thereby improving the processing efficiency and reducing energy consumption.

[0033] In the present invention, the used slurry impurity removal component in the slurry circulation component can remove calcium carbonate in the used slurry, deconstruct and precipitate it, and then achieve the purpose of removing the calcium carbonate concentration in the slurry, prepare for the recovery of the slurry, thereby saving processing costs, and the treated used slurry is introduced into the slurry configuration component through the corresponding water pump for reconfiguration, which can be quantitatively added to the used slurry that has undergone preliminary treatment according to the flue gas introduction efficiency and the sulfur concentration in the flue gas. At the same time, a certain amount of water and PH reagent can be added through an external device to configure a slurry of suitable concentration, further ensuring the reaction rate in the oxidation desulfurization component 1, while improving the processing efficiency, accelerating the reaction speed, and reducing the energy consumption of the device, and a second stirring blade is provided to further ensure the uniformity of the concentration of each component in the slurry, thereby further ensuring the reaction rate and then introducing the configured solution into the slurry holding tank through the corresponding water pump, so that it can be reused through the intact slurry output pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the structure of a low-energy wet desulfurization device in a thermal power plant.

[0035] Figure 2 Schematic diagram of the structure of the oxidation desulfurization component.

[0036] Figure 3 This is a front view of the oxidation desulfurization component structure.

[0037] Figure 4 Schematic diagram of the slurry circulation component structure.

[0038] Figure 5 It is a schematic diagram of the structure of the used slurry impurity removal component.

[0039] Figure 6 Schematic diagram of the slurry configuration component structure.

[0040] Figure 7 This is a schematic diagram of the clean water circulation component structure.

[0041] In the figure: 1. Oxidation desulfurization component; 2. Flue gas delivery system; 3. Slurry circulation component; 4. Clean water circulation component; 5. Flue gas outlet; 11. Fixed reaction tower; 12. Gas filter plate; 13. Clean water return plate; 14. Slurry drop plate; 15. Sealed plate; 16. Fixed spray group; 17. Desulfurization gas output pipe; 18. Flue gas input pipe; 19. First stirring blade; 110. First drive motor; 111. Oxygen generator; 112. Slurry drop pipe; 31. Fixed support frame; 32. Used slurry impurity removal component; 33. Slurry configuration component; 34. Slurry bearing tank; 35, water pump; 36, circulating water regulating pipe; 37, used slurry input pipe; 38, intact slurry output pipe; 321, slurry impurity removal tank; 322, scale attachment device; 323, multi-stage telescopic rod; 324, ultrasonic cleaner; 325, temperature regulator; 331, slurry preparation tank; 332, second stirring blade; 333, transmission shaft; 334, transmission belt; 335, second drive motor; 336, limestone crusher; 337, feed inlet; 41, clean water tank; 42, high-pressure water pump; 43, clean water output pipe; 44, water filter; 45, water return pipe. DETAILED DESCRIPTION

[0042] See also Figure 1 to Figure 7 The present invention provides a low-energy consumption wet desulfurization device for a thermal power plant, comprising:

[0043] The oxidative desulfurization component 1 is connected to a flue gas delivery system 2, the flue gas delivery system 2 is connected to a flue gas production device, the oxidative desulfurization component 1 is also connected to a slurry circulation component 3 and a clean water circulation component 4, and a flue gas outlet 5 is provided at the upper end of the oxidative desulfurization component 1;

[0044] The oxidation desulfurization assembly 1 comprises a fixed reaction tower 11, in which a gas filter plate 12, a clean water return plate 13, a slurry drop plate 14 and a sealing plate 15 are fixedly arranged horizontally from top to bottom in the fixed reaction tower 11, and a fixed spray group 16 is arranged above and below the gas filter plate 12 and below the clean water return plate 13 in the fixed reaction tower 11;

[0045] The slurry circulation component 3 includes a fixed support frame 31, and a used slurry impurity removal component 32, a slurry configuration component 33 and a slurry carrying tank 34 are fixedly arranged on the upper surface of the bottom of the fixed support frame 31, and the lower ends of the used slurry impurity removal component 32, the slurry configuration component 33 and the slurry carrying tank 34 are all connected to a water pump 35, and the output ends of the water pump 35 corresponding to the used slurry impurity removal component 32 and the slurry configuration component 33 are respectively connected to the slurry configuration component 33 and the slurry carrying tank 34 through two groups of circulating water regulating pipes 36, and a used slurry input pipe 37 is arranged on the upper end of the used slurry impurity removal component 32, and the other end of the used slurry input pipe 37 is arranged at the bottom of the closed reaction space, and the output end of the water pump 35 corresponding to the slurry carrying tank 34 is connected to the fixed spray group 16 below the clean water return plate 13 through an intact slurry output pipe 38;

[0046] As a preferred embodiment, the oxidation desulfurization component 1 can remove sulfur dioxide from the flue gas, the slurry circulation component 3 can continuously inject slurry of appropriate concentration into the oxidation desulfurization component 1, and recycle the slurry discharged from the oxidation desulfurization component 1, while ensuring the desulfurization efficiency, further reducing the processing cost, the clean water circulation component 4 can further process the flue gas after desulfurization to prevent it from entraining the slurry discharge device and polluting the environment, and at the same time increase the water content of the flue gas, so that the air quality can be further improved after it is discharged, in actual use, the shape, height and position of the flue gas outlet 5 can be changed to ensure that the discharged flue gas will not cause negative effects, the setting of the gas filter plate 12 can further optimize the purity of the flue gas, thereby improving the treatment quality of the flue gas, the fixed spray group 16 arranged below the gas filter plate 12 can first purify the desulfurized flue gas, and the fixed spray group 16 arranged above can play a certain cleaning role on the gas filter plate 12, while increasing the water content of the flue gas;

[0047] Further, a plurality of groups of desulfurized gas output pipes 17 are fixedly arranged on the upper surface of the sealing plate 15, and a plurality of groups of flue gas input pipes 18 are fixedly arranged on the lower surface, and through holes corresponding to the desulfurized gas output pipes 17 and the flue gas input pipes 18 are arranged on the sealing plate 15, so that one end of the desulfurized gas output pipes 17 and the flue gas input pipes 18 are arranged in the corresponding through holes, and the other end of the desulfurized gas output pipe 17 passes through the slurry drop plate 14 and the clean water return plate 13 to between the clean water return plate 13 and the fixed spray group 16 below the gas filter plate 12;

[0048] As a preferred embodiment, the flue gas inlet pipe 18 and its lower end will always remain below the slurry liquid level and will not affect the operation of the first stirring blade 19, thereby maximizing the reaction time of the flue gas and further ensuring the desulfurization quality.

[0049] Furthermore, the sealing plate 15 and the lower part of the fixed reaction tower 11 form a closed reaction space, in which a first stirring blade 19 is rotatably arranged, the first stirring blade 19 is arranged below the multiple groups of smoke inlet pipes 18, and is fixedly assembled on the output shaft of the first driving motor 110, the first driving motor 110 is fixedly assembled on the lower surface of the fixed reaction tower 11, and the lower surface of the fixed reaction tower 11 is also fixedly assembled with an oxygen generator 111, and the output end of the oxygen generator 111 is arranged in the closed reaction space;

[0050] As a preferred embodiment, the formation of the closed reaction space can maintain the reaction conditions of the slurry to the greatest extent while preventing the leakage of sulfur-containing gas. The setting of the first stirring blade 19 can accelerate the reaction rate of the slurry and sulfur dioxide, thereby improving the processing efficiency and reducing energy consumption. In actual work, in order to reduce costs, the oxygen generator 111 can be replaced with an air reactor to convert the oxygen introduced thereinto into air.

[0051] Furthermore, the slurry drop plate 14 is a plate inclined toward the flue gas delivery system 2, and a slurry drop pipe 112 is provided at the lowest point of the inclination of the side. The lower end of the slurry drop pipe 112 passes through the sealed plate 15 and is provided in the closed reaction space. There is a flue gas drop gap between the side of the slurry drop plate 14 away from the flue gas delivery system 2 and the fixed reaction tower 11.

[0052] As a preferred embodiment, the shape of the slurry drop plate 14 can ensure that the slurry enters the closed reaction space smoothly and efficiently, and to ensure that the slurry is not affected by the closed reaction space, the lower end of the slurry drop pipe 112 is located slightly below the closed plate 15 and will never be higher than the slurry liquid level (to ensure the smooth discharge of desulfurization flue gas, a certain distance will be maintained between the slurry liquid level and the bottom of the closed plate 15 under any circumstances).

[0053] Furthermore, the fixed spray group 16 disposed below the clean water return plate 13 is not provided with a spray nozzle at the position corresponding to the flue gas falling gap;

[0054] As a preferred embodiment, not setting a nozzle directly above the flue gas falling gap can minimize the inflow of slurry above the closed plate 15, prevent it from affecting the efficiency of the flue gas entering the closed reaction space, thereby affecting the overall processing progress and increasing additional energy consumption.

[0055] Further, the used slurry impurity removal component 32 includes a slurry impurity removal tank 321, a scale attachment device 322 is arranged inside the slurry impurity removal tank 321, the scale attachment device 322 is coaxially fixedly assembled on the lower end of the multi-stage telescopic rod 323, the upper end of the multi-stage telescopic rod 323 is fixedly assembled on the temperature regulator 325, the temperature regulator 325 is fixedly assembled on the upper surface of the fixed support frame 31, and an ultrasonic cleaner 324 is arranged at the lower end of the temperature regulator 325, and the ultrasonic cleaner 324 is fixedly arranged on the lower surface of the upper end of the fixed support frame 31;

[0056] As a preferred embodiment, the temperature regulator 325 can adjust the temperature and transmit it to the scale adherent 322 through the multi-stage telescopic rod 323. The state of calcium sulfate in the slurry will be affected by the temperature. When the temperature is close to its dehydration temperature, the solubility of calcium sulfate decreases, and a supersaturated solution will be formed on the scale adherent 322 and crystals will precipitate, thereby achieving the purpose of removing the calcium sulfate concentration in the slurry, preparing for the recovery of the slurry, thereby saving processing costs. The ultrasonic cleaner 324 can use the cavitation effect, acceleration effect and straight flow effect of high-frequency sound waves in the liquid to impact and vibrate the scale, loosen it and fall off from the surface of the scale adherent 322, so that the scale adherent 322 can be used repeatedly.

[0057] Further, the slurry configuration component 33 includes a slurry preparation tank 331, and a second stirring blade 332 is arranged inside the slurry preparation tank 331. The second stirring blade 332 is coaxially fixedly assembled at the lower end of the transmission shaft 333, and the upper end of the transmission shaft 333 is fixedly assembled on the transmission belt 334. The other end of the transmission belt 334 is arranged at the upper end of the second drive motor 335, and the second drive motor 335 is fixedly assembled on the upper surface of the fixed support frame 31;

[0058] The limestone crusher 336 is fixedly mounted on the fixed support frame 31, and its lower end output port is located directly above the feed port 337 opened on the slurry preparation tank 331;

[0059] As a preferred embodiment, the limestone crusher 336 can crush the incoming limestone and add it quantitatively to the used slurry that has been preliminarily treated according to the flue gas introduction efficiency and the sulfur concentration in the flue gas. At the same time, a certain amount of water and PH reagent can be added through external equipment to configure a slurry of suitable concentration, thereby further ensuring the reaction efficiency in the oxidation desulfurization component 1, improving the processing efficiency, accelerating the reaction speed, and reducing the energy consumption of the device. The setting of the second stirring blade 332 can further ensure the uniformity of the concentration of each component in the slurry, thereby further ensuring the reaction rate.

[0060] Further, the clean water circulation component 4 includes:

[0061] A clean water tank 41, the lower end of which is connected to the input end of a high-pressure water pump 42, and the output end of the high-pressure water pump 42 is connected to two fixed spray groups 16 arranged above and below the gas filter plate 12 through a clean water output pipe 43;

[0062] The upper end of the clean water tank 41 is connected to the output end of the water filter 44, and the input end of the water filter 44 is connected to the reflux hole opened on the lower surface of the clean water reflux plate 13 through a water reflux pipe 45;

[0063] The upper end of the clean water tank 41 is also connected to a water supply device;

[0064] As a preferred embodiment, the water filter 44 can clean the impurities in the reflux water to prevent them from gradually accumulating and causing pipeline blockage, thereby affecting the flue gas treatment efficiency. The setting of the high-pressure water pump 42 can give sufficient pressure to the two groups of fixed spray groups 16 connected to it, so that they can effectively remove other impurities in the flue gas and ensure the treatment quality. The water supply equipment externally connected to the upper end of the clean water tank 41 is the main water supply equipment. The oxidation desulfurization component 1 will continuously consume water (a large amount of water will adhere to the flue gas and be discharged from the device, thereby effectively improving the air quality). The reflux setting can save resources to the greatest extent, and the external water supply equipment effectively guarantees the operation of the device. The clean water sprayed by the fixed spray groups 16 above and below the gas filter plate 12 will pass through the clean water reflux plate 13 and the clean water output pipe 43, and will be stored in the clean water tank 41 after being filtered by the water filter 44, and will be input to the corresponding fixed spray group 16 through the high-pressure water pump 42 and the clean water output pipe 43 during operation.

[0065] A low-energy consumption wet desulfurization method for a thermal power plant comprises the following steps:

[0066] S1. According to the injection amount of sulfur-containing flue gas, the slurry is sequentially injected into the closed reaction space through the slurry circulation component 3, the fixed spray group 16 below the clean water return plate 13, the slurry drop plate 14 and the slurry drop pipe 112, wherein the slurry height in the closed reaction space is higher than the flue gas inlet pipe 18;

[0067] S2. The flue gas delivery system 2 inputs sulfur-containing flue gas into the oxidative desulfurization component 1, and the first drive motor 110, the oxygen generator 111, the slurry circulation component 3 and the clean water circulation component 4 are turned on;

[0068] S3. The flue gas enters the fixed reaction tower 11 and reacts with the slurry sprayed from the fixed spray group 16 below the water reflux plate 13, while removing dust from the flue gas;

[0069] S4. The flue gas that reacts first with the slurry sequentially passes through the slurry drop plate 14 and the slurry drop pipe 112 and falls into the closed reaction space, and the unreacted flue gas sequentially passes through the flue gas drop gap and the flue gas inlet pipe 18 directly into the slurry in the closed reaction space;

[0070] S5. The oxygen generator 111 introduces sufficient oxygen into the slurry, and under the stirring of the first stirring blade 19, the sulfur dioxide in the flue gas reacts chemically with the calcium carbonate in the slurry and the oxygen blown in to generate calcium sulfate, thereby removing the sulfur dioxide in the flue gas;

[0071] S6. Other gases in the flue gas pass through the desulfurized gas output pipe 17, are sprayed by the fixed spray group 16 below the gas filter plate 12, filtered by the gas filter plate 12, and sprayed by the fixed spray group 16 above the gas filter plate 12, and then are discharged from the device through the flue gas outlet 5;

[0072] S7. The slurry in the closed reaction space is input into the used slurry impurity removal component 32 through the used slurry input pipe 37, and the used slurry impurity removal component 32 removes calcium sulfate in the used slurry to decompose and precipitate it;

[0073] S8. The treated used slurry is introduced into the slurry configuration assembly 33 for reconfiguration, and then the configured solution is introduced into the slurry holding tank 34 so that it can be reused through the intact slurry output pipe 38;

[0074] S9. The clean water sprayed by the fixed spray groups 16 above and below the gas filter plate 12 passes through the clean water return plate 13 and the clean water output pipe 43, and is stored in the clean water tank 41 after being filtered by the water filter 44. During operation, it is input to the corresponding fixed spray group 16 through the high-pressure water pump 42 and the clean water output pipe 43.

[0075] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low energy consumption wet desulfurization device for a thermal power plant, characterized in that: The invention comprises an oxidation desulfurization component (1), which is connected to a flue gas delivery system (2), the flue gas delivery system (2) is connected to a flue gas production device, the oxidation desulfurization component (1) is also connected to a slurry circulation component (3) and a clean water circulation component (4), and a flue gas discharge outlet (5) is arranged at the upper end of the oxidation desulfurization component (1); The oxidation desulfurization component (1) comprises a fixed reaction tower (11), wherein a gas filter plate (12), a clean water return plate (13), a slurry drop plate (14) and a sealing plate (15) are horizontally fixedly arranged in order from top to bottom in the fixed reaction tower (11), and a fixed spray group (16) is arranged above and below the gas filter plate (12) and below the clean water return plate (13) in the fixed reaction tower (11); The slurry circulation component (3) comprises a fixed support frame (31), and a used slurry impurity removal component (32), a slurry configuration component (33) and a slurry carrying tank (34) are fixedly arranged on the upper surface of the bottom of the fixed support frame (31), and the lower ends of the used slurry impurity removal component (32), the slurry configuration component (33) and the slurry carrying tank (34) are all connected to a pumping pump (35), and the pumping pumps (35) corresponding to the used slurry impurity removal component (32) and the slurry configuration component (33) are connected to the lower ends of the used slurry impurity removal component (32), the slurry configuration component (33) and the slurry carrying tank (34) are connected to the lower ends of the used slurry impurity removal component (32) and the slurry configuration component (33). The output end of the used slurry is connected to the slurry configuration component (33) and the slurry carrying tank (34) respectively through a circulating water regulating pipe (36); a used slurry input pipe (37) is provided at the upper end of the used slurry impurity removal component (32); the other end of the used slurry input pipe (37) is provided at the bottom of the closed reaction space; the output end of the water pump (35) corresponding to the slurry carrying tank (34) is connected to the fixed spray group (16) below the clean water return plate (13) through a good slurry output pipe (38); A plurality of groups of desulfurized gas output pipes (17) are fixedly arranged on the upper surface of the sealing plate (15), and a plurality of groups of flue gas input pipes (18) are fixedly arranged on the lower surface, and through holes corresponding to the desulfurized gas output pipes (17) and the flue gas input pipes (18) are arranged on the sealing plate (15), so that one end of the desulfurized gas output pipe (17) and the flue gas input pipe (18) is arranged in the corresponding through holes, and the other end of the desulfurized gas output pipe (17) passes through the slurry drop plate (14) and the clean water return plate (13) to between the clean water return plate (13) and the fixed spray group (16) below the gas filter plate (12); The sealing plate (15) and the lower part of the fixed reaction tower (11) form a closed reaction space, wherein a first stirring blade (19) is rotatably arranged inside the space. The first stirring blade (19) is arranged below the plurality of smoke inlet pipes (18) and is fixedly mounted on the output shaft of a first drive motor (110). The first drive motor (110) is fixedly mounted on the lower surface of the fixed reaction tower (11). An oxygen generator (111) is also fixedly mounted on the lower surface of the fixed reaction tower (11), and the output end of the oxygen generator (111) is arranged in the closed reaction space. The slurry drop plate (14) is a plate inclined toward the flue gas conveying system (2), and a slurry drop pipe (112) is arranged at the lowest point of the inclination of the side. The lower end of the slurry drop pipe (112) passes through the sealing plate (15) and is arranged in the closed reaction space. A flue gas drop gap exists between the side of the slurry drop plate (14) away from the flue gas conveying system (2) and the fixed reaction tower (11).

2. A low-energy consumption wet desulfurization device for a thermal power plant according to claim 1, characterized in that: The fixed spray group (16) arranged below the clean water return plate (13) is not provided with a spray nozzle at a position corresponding to the smoke falling gap.

3. A low energy consumption wet desulfurization device for a thermal power plant according to claim 1, characterized in that: The used slurry impurity removal component (32) comprises a slurry impurity removal tank (321), a scale attachment device (322) is arranged inside the slurry impurity removal tank (321), the scale attachment device (322) is coaxially fixedly assembled on the lower end of a multi-stage telescopic rod (323), the upper end of the multi-stage telescopic rod (323) is fixedly assembled on a temperature regulator (325), the temperature regulator (325) is fixedly assembled on the upper surface of a fixed support frame (31), and an ultrasonic cleaner (324) is arranged at the lower end of the temperature regulator (325), and the ultrasonic cleaner (324) is fixedly arranged on the lower surface of the upper end of the fixed support frame (31).

4. A low energy consumption wet desulfurization device for a thermal power plant according to claim 1, characterized in that: The slurry configuration component (33) comprises a slurry preparation tank (331), a second stirring blade (332) is arranged inside the slurry preparation tank (331), the second stirring blade (332) is coaxially fixedly assembled on the lower end of the transmission shaft (333), the upper end of the transmission shaft (333) is fixedly assembled on the transmission belt (334), the other end of the transmission belt (334) is arranged on the upper end of the second drive motor (335), and the second drive motor (335) is fixedly assembled on the upper surface of the fixed support frame (31); The limestone crusher (336) is fixedly mounted on the fixed support frame (31), and its lower end output port is located directly above the feed port (337) opened on the slurry preparation tank (331).

5. A low energy consumption wet desulfurization device for a thermal power plant according to claim 1, characterized in that: The clean water circulation assembly (4) comprises: A clean water tank (41), the lower end of which is connected to the input end of a high-pressure water pump (42), and the output end of the high-pressure water pump (42) is connected to two fixed spray groups (16) arranged above and below the gas filter plate (12) through a clean water output pipe (43); The upper end of the clean water tank (41) is connected to the output end of the water filter (44), and the input end of the water filter (44) is connected to the reflux hole formed on the lower surface of the clean water reflux plate (13) through a water reflux pipe (45); The upper end of the clean water tank (41) is also connected to a water supply device.

6. A low-energy consumption wet desulfurization method for a thermal power plant, which uses the low-energy consumption wet desulfurization device for a thermal power plant as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1. According to the injection amount of sulfur-containing flue gas, the slurry is injected into the closed reaction space through the slurry circulation component (3), the fixed spray group (16) below the clean water return plate (13), the slurry drop plate (14) and the slurry drop pipe (112) in sequence, and the slurry height in the closed reaction space is higher than the flue gas input pipe (18); S2. The flue gas delivery system (2) inputs sulfur-containing flue gas into the oxidation desulfurization component (1), and the first drive motor (110), the oxygen generator (111), the slurry circulation component (3) and the clean water circulation component (4) are turned on; S3. The flue gas enters the fixed reaction tower (11) and reacts with the slurry sprayed by the fixed spray group (16) below the clean water reflux plate (13) to remove dust in the flue gas; S4. The flue gas that reacts first falls into the closed reaction space along with the slurry through the slurry drop plate (14) and the slurry drop pipe (112), and the flue gas that does not react passes through the flue gas drop gap and the flue gas input pipe (18) directly into the slurry in the closed reaction space; S5. The oxygen generator (111) introduces sufficient oxygen into the slurry, and under the stirring of the first stirring blade (19), the sulfur dioxide in the flue gas reacts chemically with the calcium carbonate in the slurry and the oxygen blown in to generate calcium sulfate, thereby removing the sulfur dioxide in the flue gas; S6. Other gases in the flue gas pass through the desulfurized gas output pipe (17), are sprayed by the fixed spray group (16) below the gas filter plate (12), filtered by the gas filter plate (12), and sprayed by the fixed spray group (16) above the gas filter plate (12), and are discharged from the device through the flue gas outlet (5); S7. The slurry in the closed reaction space is input into the used slurry impurity removal component (32) through the used slurry input pipe (37), and the used slurry impurity removal component (32) removes calcium sulfate in the used slurry to decompose and precipitate it; S8. The treated used slurry is introduced into the slurry configuration component (33) for reconfiguration, and then the configured solution is introduced into the slurry holding tank (34) so ​​that it can be reused through the intact slurry output pipe (38); S9. The clean water sprayed by the fixed spray groups (16) above and below the gas filter plate (12) passes through the clean water return plate (13) and the clean water output pipe (43), and is filtered by the water filter (44) and stored in the clean water tank (41). When working, it is input to the corresponding fixed spray group (16) through the high-pressure water pump (42) and the clean water output pipe (43).

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