Desulfurization system

Abstract

The utility model discloses a desulfurization system, which comprises a main tower, a first slurry storage tank, a second slurry storage tank, a gas inlet, a gas outlet and a gas outlet, the primary circulating spraying device is arranged in the main tower, is positioned between the flue gas inlet and the flue gas outlet, and is communicated with the first slurry storage pool; the first stirring device is arranged on the main tower and is used for stirring the slurry in the first slurry storage pool; and the first driving assembly comprises a first driving piece, and the first driving piece is used for driving the primary circulating spraying device and the first stirring device. According to the desulfurization system disclosed by the utility model, the structure can be simplified, and the production and investment cost can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas emission treatment technical field more particularly, relate to a kind of desulfurization systems. BACKGROUND

[0002] With the increasingly severe environmental situation, the state gradually increases the discharge control requirement of sulfur dioxide of coal-fired power plant, coal-fired power plant is gradually completed by using desulfurization system ultra-low emission efficiency improvement transformation work, realizes the partition control of sulfur dioxide absorption, limestone dissolution, desulfurization by-product oxidation, meets the desulfurization demand required.But, in the related art, because more driving members are used in desulfurization system to realize different driving requirements, the structure of desulfurization system is complex, and the investment cost is increased. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in prior art is solved.For this purpose, one object of the utility model is to provide a kind of desulfurization system, the desulfurization system can simplify structure, be favorable to reduce production and investment cost.

[0004] According to the desulfurization system of the utility model embodiment, the first driving member is used to drive the first circulating spray device and the first stirring device, so that the first driving member can simultaneously realize the driving requirement of the first circulating spray device and the first stirring device, the number of driving members is simplified, thereby the structure of desulfurization system can be simplified, and it is favorable to reduce production and investment cost.

[0005] According to the desulfurization system of the utility model embodiment, the first circulating spray device is communicated with the first slurry storage pool, the slurry in the first slurry storage pool can be sprayed to flue gas by the first circulating spray device, the desulfurization of flue gas is realized, the first stirring device is arranged in the main tower for stirring the slurry in the first slurry storage pool, to prevent slurry from precipitating and caking, and the first driving member is used to drive the first circulating spray device and the first stirring device, so that the first driving member can simultaneously realize the driving requirement of the first circulating spray device and the first stirring device, the number of driving members is simplified, thereby the structure of desulfurization system can be simplified, and it is favorable to reduce production and investment cost.

[0006] In addition, the desulfurization system according to the above embodiment of the utility model can also have the following additional technical features:

[0007] According to some embodiments of the utility model, the desulfurization system further comprises: a secondary tower, the bottom of the secondary tower is provided with a second slurry storage pool; a secondary circulating spray device, the secondary circulating spray device is arranged in the main tower and located between the flue gas outlet and the primary circulating spray device, the secondary circulating spray device is communicated with the second slurry storage pool; a second stirring device, the second stirring device is arranged in the secondary tower and used for stirring the slurry in the second slurry storage pool; and a second driving assembly, the second driving assembly comprises a third driving member, and the third driving member is used for driving the secondary circulating spray device and the second stirring device.

[0008] According to some embodiments of the utility model, the desulfurization system further comprises: a secondary tower, the bottom of the secondary tower is provided with a second slurry storage pool; a secondary circulating spray device, the secondary circulating spray device is arranged in the main tower and located between the flue gas outlet and the primary circulating spray device, the secondary circulating spray device is communicated with the second slurry storage pool; a second stirring device, the second stirring device is arranged in the secondary tower and used for stirring the slurry in the second slurry storage pool; and a second driving assembly, the second driving assembly comprises a third driving member, and the third driving member is used for driving the secondary circulating spray device and the second stirring device.

[0009] According to some embodiments of the utility model, the desulfurization system further comprises: a heat exchange device, the heat exchange device comprises a first heat exchange channel and a second heat exchange channel, the first heat exchange channel is connected in series between the second slurry storage pool and the secondary circulating spray device, cooling liquid flows in the second heat exchange channel, and the cooling liquid in the second heat exchange channel is used for cooling the slurry in the first heat exchange channel.

[0010] According to some embodiments of the utility model, the secondary circulating spray device is M, M is an integer greater than or equal to 2, the second driving assembly further comprises a fourth driving member, the fourth driving member is M-1, and the desulfurization system further comprises: a communication pipe, one end of the communication pipe is communicated with M secondary circulating spray devices, the other end of the communication pipe is communicated with the third driving member and M-1 fourth driving members, and the first heat exchange channel is located on the communication pipe.

[0011] According to some embodiments of the utility model, the third driving member is a variable frequency pump.

[0012] According to some embodiments of the utility model, the desulfurization system further comprises: a mist removal device, at least one side of the upper side and the lower side of the secondary circulating spray device is provided with the mist removal device, so as to remove the mist of flue gas.

[0013] According to some embodiments of the utility model, the desulfurization system further comprises: a liquid collecting bowl, the liquid collecting bowl is located between the primary circulating spray device and the secondary circulating spray device; and a liquid collecting guide pipe, one end of the liquid collecting guide pipe is communicated with the bottom of the liquid collecting bowl, and the other end is communicated with at least one of the secondary tower and the main tower.

[0014] According to some embodiments of the present invention, a flow guide cone is provided on the inner peripheral wall of the main tower, and the flow guide cone extends along the circumferential direction of the main tower and is located above the liquid collection bowl.

[0015] According to some embodiments of the present invention, the main tower is further provided with a packing layer, which is located between the liquid collection bowl and the secondary circulating spray device. The packing layer contains a plurality of through holes for the flow of flue gas, and the plurality of through holes bend and extend along the thickness direction of the packing layer.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a process flow diagram of the desulfurization system according to an embodiment of the present utility model.

[0019] Figure label:

[0020] 100. Desulfurization system; 200. Flue gas;

[0021] 10. Main tower; 11. Flue gas inlet; 12. Flue gas outlet; 13. First slurry storage tank; 14. Slurry collection bowl; 15. Slurry collection pipe; 16. Packing layer; 17. Guide cone; 18. First air duct network;

[0022] 21. Primary circulating spray system; 22. Secondary circulating spray system;

[0023] 31. First stirring device; 32. Second stirring device;

[0024] 41. First drive assembly; 42. Second drive assembly; 411. First drive element; 412. Second drive element; 421. Third drive element; 422. Fourth drive element;

[0025] 50. Secondary tower; 51. Secondary slurry storage tank; 52. Secondary air duct network;

[0026] 60. Heat exchange device; 61. First heat exchange channel; 62. Second heat exchange channel; 63. Connecting pipe; 621. Coolant inlet; 622. Coolant outlet;

[0027] 70. Demisting device; 71. Process water;

[0028] 80. Slurry tank; 81. Agitator; 82. Slurry supply pump;

[0029] 91. Oxidation blower; 92. Discharge pump. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "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 this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] In the description of this utility model, "first feature" and "second feature" may include one or more of the features, "multiple" means two or more, "first feature above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them, and "first feature above", "above" and "over" the second feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0033] The desulfurization system 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0034] Reference Figure 1 As shown, the desulfurization system 100 according to an embodiment of the present invention may include: a main tower 10, a primary circulating spray device 21, and a first stirring device 31.

[0035] Specifically, the main tower 10 is equipped with a flue gas inlet 11 and a flue gas outlet 12. A first slurry storage tank 13 is located at the bottom of the main tower 10. A primary circulating spray device 21 is installed inside the main tower 10, positioned between the flue gas inlet 11 and the flue gas outlet 12, and connected to the first slurry storage tank 13. Thus, flue gas 200 enters the lower region of the main tower 10 through the flue gas inlet 11 and flows upwards. The flue gas 200 can come into countercurrent contact with the slurry sprayed downwards by the primary circulating spray device 21, allowing the slurry to remove most of the sulfur dioxide (SO2) and dust impurities from the flue gas 200. The washed flue gas 200 is then discharged into the chimney through the flue gas outlet 12, achieving desulfurization of the flue gas 200. The downward-sprayed slurry falls into the first slurry storage tank 13 and is then circulated and sprayed again by the primary circulating spray device 21. Meanwhile, the first stirring device 31 is located in the main tower 10. The first stirring device 31 can stir the slurry in the first slurry storage tank 13 to prevent the slurry from settling and clumping, thus ensuring desulfurization efficiency. For example, the slurry is limestone slurry.

[0036] In addition, such as Figure 1 As shown, the desulfurization system 100 also includes a first drive assembly 41, which includes a first drive element 411. The first drive element 411 can drive the primary circulating spray device 21 and the first stirring device 31, so that the first drive element 411 can simultaneously meet the driving requirements of the primary circulating spray device 21 and the first stirring device 31, simplifying the number of drive elements and thus simplifying the structure of the desulfurization system 100, which is beneficial to reducing production and investment costs. For example, the first stirring device 31 performs jet stirring, and the first drive element 411 can also act as a jet pump while driving the primary circulating spray device 21 to spray slurry, so that the first drive element 411 can provide power for jet stirring and meet the required driving requirements.

[0037] In some embodiments, such as Figure 1 As shown, the outlet of the first driving component 411 is connected to the primary circulating spray device 21 and the first stirring device 31, so that the first driving component 411 can drive the slurry from the outlet of the first driving component 411 to the primary circulating spray device 21 and the first stirring device 31, thereby achieving the required spraying and jet stirring.

[0038] According to the embodiment of the utility model, the desulfurization system 100 is connected to the first slurry storage tank 13 through a primary circulating spray device 21. The slurry in the first slurry storage tank 13 can spray the flue gas 200 through the primary circulating spray device 21 to achieve desulfurization of the flue gas 200. The first stirring device 31 is provided on the main tower 10 to stir the slurry in the first slurry storage tank 13 to prevent slurry sedimentation and agglomeration. The first driving component 411 is used to drive the primary circulating spray device 21 and the first stirring device 31, so that the first driving component 411 can simultaneously meet the driving requirements of the primary circulating spray device 21 and the first stirring device 31, simplifying the number of driving components, thereby simplifying the structure of the desulfurization system 100 and helping to reduce production and investment costs.

[0039] In some embodiments, such as Figure 1 As shown, there are N primary circulating spray devices 21, where N is an integer greater than or equal to 2. The first driving member 411 drives one of the primary circulating spray devices 21, so that the first driving member 411 can simultaneously meet the driving requirements of the primary circulating spray device 21 and the first stirring device 31.

[0040] In addition, such as Figure 1 As shown, the first drive assembly 41 also includes a second drive element 412, of which there are N-1 units. Each second drive element 412 corresponds one-to-one with one of the N-1 primary circulating spray devices 21, meaning the N primary circulating spray devices 21 can be configured as a unit. By driving the N-1 primary circulating spray devices 21 with the N-1 second drive elements 412, better desulfurization of the flue gas 200 can be ensured, and it is convenient to control the N primary circulating spray devices 21 individually to meet different desulfurization requirements. For example, based on the boiler load and sulfur dioxide concentration fluctuations of the coal-fired power plant, by adjusting the number and frequency of the operating drive elements within the first drive assembly 41, the desulfurization system 100 can be ensured to meet emission standards.

[0041] Based on ultra-low emission standards, and with further stringent requirements for emission limits, the SO2 emission concentration of desulfurization systems must be ≤25 mg / Nm³. 3 Or SO2 emission concentration ≤20mg / Nm 3 (Ultra-low emissions), therefore, coal-fired power plants in the corresponding regions are required to take this into consideration in advance when upgrading their desulfurization systems.

[0042] Therefore, in some embodiments, the first drive component 411 can be a variable frequency pump. The variable frequency pump can control the flow rate and head required by the primary circulating spray device 21 and the first stirring device 31, enabling more flow rate combinations for variable load conditions and achieving precise spray adjustment. This is beneficial for energy-saving operation of the system and can meet different usage requirements. Thus, while meeting SO2 emission requirements, the desulfurization system 100 can operate flexibly, efficiently, economically, and stably under different load conditions, achieving high and stable desulfurization efficiency and good economy under a wide range of load conditions.

[0043] In some specific embodiments, such as Figure 1 As shown, there are three primary circulating spray devices 21. A first drive unit 411 drives one of these devices. The first drive assembly 41 also includes two second drive units 412, each corresponding to one of the other two primary circulating spray devices 21. The operating mode of the first drive unit 411 and the two second drive units 412 is adjusted according to the desulfurization load changes of the desulfurization system 100. The first drive unit 411 always operates at a variable frequency to meet the required desulfurization demand.

[0044] Under high desulfurization load, the first drive unit 411 and both second drive units 412 are fully operational. When the desulfurization load decreases slightly, the first drive unit 411 is controlled to operate at a reduced frequency. When the desulfurization load decreases excessively, one of the second drive units 412 is stopped. Thus, by controlling the number of operating second drive units 412 and adjusting the frequency of the first drive unit 411, the flow combination of multiple primary circulating spray devices 21 can be significantly increased, enabling precise adjustment of multiple primary circulating spray devices 21, which is beneficial for the energy-saving operation of the desulfurization system 100.

[0045] In some embodiments of this utility model, such as Figure 1 As shown, the desulfurization system 100 also includes a secondary tower 50, a secondary circulating spray device 22, and a second stirring device 32. The bottom of the secondary tower 50 is provided with a second slurry storage tank 51. The secondary circulating spray device 22 is located inside the main tower 10, between the flue gas outlet 12 and the primary circulating spray device 21. The secondary circulating spray device 22 is connected to the second slurry storage tank 51, enabling the desulfurization system 100 to form a single-tower, double-circulation desulfurization system. The second stirring device 32 is located in the secondary tower 50 and can stir the slurry in the second slurry storage tank 51 to prevent slurry sedimentation and agglomeration, ensuring desulfurization efficiency.

[0046] Thus, flue gas 200 enters the lower region of the main tower 10 through flue gas inlet 11 and flows upward. Flue gas 200 can come into countercurrent contact with the slurry sprayed from top to bottom by the primary circulating spray device 21, so that the slurry sprayed by the primary circulating spray device 21 can remove most of the sulfur dioxide (SO2) and dust impurities in flue gas 200. Flue gas 200 continues to flow upward, and flue gas 200 can come into countercurrent contact with the slurry sprayed from top to bottom by the secondary circulating spray device 22, completing secondary desulfurization and ensuring good desulfurization effect on flue gas 200. The washed flue gas 200 is discharged into the chimney from flue gas outlet 12, completing the desulfurization of flue gas 200. The downward sprayed slurry can fall into the first slurry storage tank 13 and then be circulated and sprayed by the primary circulating spray device 21.

[0047] The desulfurization system 100 can separate the oxidation zone and the absorption zone. Flue gas 200 undergoes two SO2 removal processes, involving two stages of slurry circulation. Each stage has an independent circulating slurry tank and spray device, and each stage has different operating parameters according to its function. By controlling the different pH values ​​of the first slurry storage tank 13 and the second slurry storage tank 51, independent pH control of the main tower 10 and the secondary tower 50 can be achieved, ensuring efficient operation of the SO2 absorption and calcium sulfite (CaSO3) oxidation processes in flue gas 200, and achieving high removal efficiency. Therefore, the desulfurization system 100, through the regulation of core parameters such as the pH value and density of the slurry in the dual-circulation loop, achieves zoned control of SO2 absorption, limestone dissolution, and desulfurization by-product oxidation, achieving a desulfurization efficiency of over 99% and meeting the requirement of ultra-low SO2 emissions.

[0048] In addition, such as Figure 1 As shown, the desulfurization system 100 also includes a second drive assembly 42, which includes a third drive component 421. The third drive component 421 can drive the secondary circulating spray device 22 and the second stirring device 32, so that the third drive component 421 can simultaneously meet the driving requirements of the secondary circulating spray device 22 and the second stirring device 32, simplifying the number of drive components, thereby simplifying the structure of the desulfurization system 100 and helping to reduce production and investment costs.

[0049] In some embodiments, the second stirring device 32 can realize jet stirring, and the third driving member 421 can also act as a jet pump while driving the secondary circulating spraying device 22 to spray slurry, so that the third driving member 421 can provide power for jet stirring and meet the required driving requirements.

[0050] In some embodiments, such as Figure 1As shown, the outlet of the third driving component 421 is connected to the secondary circulating spray device 22 and the second stirring device 32, so that the third driving component 421 can drive the slurry from the outlet of the third driving component 421 to the secondary circulating spray device 22 and the second stirring device 32, thereby achieving the required spraying and jet stirring.

[0051] In some embodiments, such as Figure 1 As shown, the desulfurization system 100 also includes a slurry tank 80 and a slurry supply pump 82. The slurry tank 80 is connected to the first slurry storage tank 13 and the second slurry storage tank 51. The slurry supply pump 82 is located between the slurry tank 80 and the first slurry storage tank 13 and the second slurry storage tank 51. The freshly prepared slurry is sent to the first slurry storage tank 13 and the second slurry storage tank 51 respectively via the slurry supply pump 82 to adjust the pH value of different slurries. For example, the pH of the slurry in the first slurry storage tank 13 is controlled at 4.6-5.0 to ensure good CaSO3 oxidation effect in an acidic environment, which is beneficial to gypsum crystallization; the pH of the slurry in the second slurry storage tank 51 is controlled at 5.8-6.4. In a high pH environment, SO2 absorption is enhanced while the amount of slurry required by the secondary circulating spray device 22 is greatly reduced.

[0052] In some embodiments, such as Figure 1 As shown, the desulfurization system 100 also includes an agitator 81, which can agitate the slurry in the slurry tank 80 to prevent slurry sedimentation and clumping, and ensure smooth slurry flow.

[0053] In some embodiments, the secondary circulating spray device 22 includes multiple low-flow nozzles. The dense arrangement of the low-flow nozzles enables the high-pH slurry to be processed and a small amount of SO2 to be removed, thus making the energy-saving effect of the third drive unit 421 even better.

[0054] In some embodiments, such as Figure 1 As shown, the desulfurization system 100 also includes an oxidation fan 91, a first air duct network 18, a second air duct network 52, and a discharge pump 92. The first air duct network 18 is located inside the main tower 10, and the second air duct network 52 is located inside the secondary tower 50. The oxidation fan 91 is connected to the first air duct network 18 and the second air duct network 52. Discharge pumps 92 are connected to both the main tower 10 and the secondary tower 50. Air can be sent by the oxidation fan 91 to the first air duct network 18 and the second air duct network 52 respectively to oxidize the CaSO3 generated during desulfurization into gypsum. The gypsum at the bottom of the main tower 10 and the secondary tower 50 is sent to the gypsum dehydration system via the discharge pump 92 to achieve the discharge of the gypsum.

[0055] In related technologies, during actual operation, desulfurization systems face difficulties in economic and stable operation due to changes in the sulfur content of coal, blending of coal, co-firing of coal slime, and sudden load changes caused by peak shaving. Furthermore, the use of wet desulfurization technology in desulfurization systems leads to an increase in the moisture content of flue gas after desulfurization. If the desulfurized flue gas is directly discharged into the atmosphere through the chimney, a large amount of saturated water vapor carried in the flue gas will drift into the atmosphere with the flue gas, easily causing white smoke to be emitted from the chimney.

[0056] Therefore, in some embodiments of this utility model, such as Figure 1 As shown, the desulfurization system 100 also includes a heat exchange device 60, which includes a first heat exchange channel 61 and a second heat exchange channel 62. The first heat exchange channel 61 is connected in series between the second slurry storage tank 51 and the secondary circulating spray device 22. Cooling liquid flows through the second heat exchange channel 62, and the cooling liquid in the second heat exchange channel 62 can cool the slurry in the first heat exchange channel 61.

[0057] Therefore, the heat exchanger 60 can cool the slurry in the secondary circulating spray device 22. The cooled slurry is sprayed from the secondary circulating spray device 22 and comes into counter-current contact with the flue gas 200. While absorbing SO2 from the flue gas 200, the slurry can also lower the temperature of the flue gas 200, thereby releasing some of the moisture in the flue gas 200, effectively reducing the moisture content of the flue gas 200, improving the dehumidification effect of the flue gas 200, and effectively reducing and alleviating the phenomenon of white smoke from the chimney. For example, the heat exchanger can be a plate heat exchanger.

[0058] In some embodiments, such as Figure 1 As shown, the second heat exchange channel 62 has a coolant inlet 621 and a coolant outlet 622. The coolant can enter the second heat exchange channel 62 through the coolant inlet 621, so that the coolant can cool the slurry in the first heat exchange channel 61, and flow out through the coolant outlet 622 to realize the circulation of the coolant and ensure good cooling effect on the slurry in the first heat exchange channel 61.

[0059] According to some embodiments of this utility model, such as Figure 1 As shown, there are M secondary circulating spray devices 22, where M is an integer greater than or equal to 2. By using M secondary circulating spray devices 22, a better desulfurization effect on flue gas 200 can be ensured.

[0060] In addition, such as Figure 1As shown, the second drive assembly 42 also includes a fourth drive element 422, of which there are M-1 fourth drive elements 422. The desulfurization system 100 also includes a connecting pipe 63, one end of which is connected to M secondary circulating spray devices 22, and the other end of which is connected to a third drive element 421 and M-1 fourth drive elements 422. This allows the third drive element 421 to simultaneously drive both the primary circulating spray device 21 and the first stirring device 31. The addition of fourth drive elements 422 ensures reliable driving of the slurry and facilitates separate control of the third and fourth drive elements 421 and 422 to meet different desulfurization requirements. For example, based on the boiler load and sulfur dioxide concentration fluctuations of the coal-fired power plant, the number and frequency of operation of the drive elements in the second drive assembly 42 can be adjusted to ensure that the desulfurization system 100 meets emission standards.

[0061] At the same time, such as Figure 1 As shown, the first heat exchange channel 61 is located on the connecting pipe 63, which facilitates the cooling of the slurry in the M secondary circulating spray devices 22 by the heat exchange device 60, ensures a compact structure, reduces the use of the device, and helps to reduce production costs.

[0062] In some embodiments, the first drive assembly 41 has two or more drive units, and the number of operating drive units in the second drive assembly 42 is selected according to the load and the sulfur content of the coal. For example, under the design sulfur content, a "2+1" mode is used at low load, a "2+2" mode is used at medium load, and a "3+1" or "3+2" mode is used at high load. However, due to changes in the sulfur content of the coal, blending of coal or even co-firing of coal slime, and sudden load changes caused by peak shaving, difficulties arise in the economic and stable operation of the system. For example, under low load and low sulfur content conditions, even with the "2+1" operation mode, the spray volume is still too large, resulting in unnecessary energy waste; under high load, high sulfur content, and SO2 emission standards of ultra-low, even with the "3+2" operation mode, emission exceedances still occur.

[0063] Therefore, in this invention, the third driving component 421 is a variable frequency pump. The variable frequency pump can control the flow rate and head required by the secondary circulating spray device 22 and the second stirring device 32, enabling more flow rate combinations for varying load conditions and precise spray adjustment. This is beneficial for energy-saving operation of the system and can meet different usage needs. Thus, while meeting SO2 emission requirements, the desulfurization system 100 achieves flexible, efficient, economical, and stable operation under different load conditions, achieving high and stable desulfurization efficiency and good economy across a wide range of load conditions.

[0064] In some embodiments of this utility model, such as Figure 1As shown, the desulfurization system 100 also includes a demister 70. At least one side of the secondary circulating spray device 22, either the upper or lower side, is equipped with a demister 70. The demister 70 can demist the flue gas 200, effectively preventing or reducing white smoke emission from the chimney. For example, the demister 70 located on the lower side of the secondary circulating spray device 22 can be a plate demister, and the demister 70 located on the upper side of the secondary circulating spray device 22 can be a ridge demister, both meeting the required demisting needs.

[0065] When a demister 70 is installed above the secondary circulating spray device 22, the flue gas 200 after desulfurization by the secondary circulating spray device 22 can have droplets removed from it by the demister 70 before being discharged into the chimney through the main tower 10 outlet flue, effectively preventing or reducing white smoke from the chimney. When a demister 70 is installed below the secondary circulating spray device 22, the flue gas 200 after desulfurization by the primary circulating spray device 21 can enter the secondary circulating spray device 22 after passing through the demister 70, which helps reduce the excessive entry of impurities from the flue gas 200 into the secondary circulating slurry, keeping the concentration of the secondary circulating slurry and Cl- ions at a low level, thus reducing... The scouring and corrosion of the flow parts and equipment of the secondary circulating spray device 22 can effectively improve the service life of the desulfurization system 100 and ensure the safe and stable operation of the desulfurization system 100. This enables primary demisting of the wet flue gas 200 after the primary circulating spray, reducing the impact of the flue gas 200 carrying slurry into the secondary circulation on the secondary circulating slurry. When demisting devices 70 are installed on both the upper and lower sides of the secondary circulating spray device 22, primary demisting of the wet flue gas 200 after the primary circulating spray can be performed, reducing the impact of the flue gas 200 carrying slurry into the secondary circulation on the secondary circulating slurry, and ensuring reliable removal of droplets carried in the flue gas 200, effectively avoiding or slowing down the emission of white smoke from the chimney.

[0066] In some embodiments, the desulfurization system 100 further includes a process water tank and a flushing water pump. The process water tank is connected to the demister 70, and the process water 71 in the process water tank can be sent to the flushing pipeline of the demister 70 via the flushing water pump to flush the demister 70, ensuring that the demister 70 is free of scale and that the demister 70 has reliable demisting capabilities. For example, the flushing water pump can be controlled to automatically flush the demister 70 at regular intervals.

[0067] According to some embodiments of this utility model, such as Figure 1As shown, the desulfurization system 100 also includes a collection bowl 14 and a collection inlet pipe 15. The collection bowl 14 is located between the primary circulating spray device 21 and the secondary circulating spray device 22. One end of the collection inlet pipe 15 is connected to the bottom of the collection bowl 14, and the other end of the collection inlet pipe 15 is connected to at least one of the secondary tower 50 and the main tower 10. That is, the other end of the collection inlet pipe 15 is connected to the secondary tower 50, or the other end of the collection inlet pipe 15 is connected to the main tower 10, or the other end of the collection inlet pipe 15 is connected to both the secondary tower 50 and the main tower 10. Thus, the slurry sprayed downward by the secondary circulating spray device 22 can fall into the collection bowl 14, and the collection bowl 14 can collect the slurry. The slurry in the collection bowl 14 can be discharged through the collection inlet pipe 15 to at least one of the secondary tower 50 and the main tower 10, that is, the slurry can enter the first slurry storage tank 13 or the second slurry storage tank 51, which facilitates circulating spraying and meets the required slurry circulation needs.

[0068] Meanwhile, by utilizing the height difference between the collection bowl and the main tower 10 or the secondary tower 50, the secondary circulating slurry flows into the first slurry storage tank 13 or the second slurry storage tank 51. This allows for the replenishment of the first slurry storage tank 13 or the second slurry storage tank 51 by the secondary circulating slurry and pH adjustment without energy consumption, saving the need for a slurry flow pump and reducing investment costs.

[0069] According to some embodiments of this utility model, such as Figure 1 As shown, a guide cone 17 is provided on the inner peripheral wall of the main tower 10. The guide cone 17 extends along the circumferential direction of the main tower 10 and is located above the collection bowl 14. The guide cone 17 guides the slurry sprayed downward by the secondary circulating spray device 22, facilitating the slurry to enter the collection bowl 14. The end of the guide cone 17 away from the inner peripheral wall of the main tower 10 is located on the inner side of the outer peripheral wall of the collection bowl 14. This prevents the slurry from flowing through the gap between the guide cone 17 and the collection bowl 14 into the first slurry storage tank 13, thus avoiding any impact on the pH of the first slurry storage tank 13 and ensuring the reliable operation of the desulfurization system 100.

[0070] In some embodiments of this utility model, such as Figure 1 As shown, the main tower 10 also includes a packing layer 16, which is located between the liquid collection bowl 14 and the secondary circulating spray device 22. The packing layer 16 contains multiple through holes to facilitate the flow of flue gas 200. The multiple through holes are located along the thickness direction of the packing layer 16 (e.g., ...). Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 The bending and extension (as shown in the vertical direction) through the flue gas 200 through multiple through-holes can enhance the contact between the flue gas 200 and the secondary circulating spray slurry, which is beneficial to improving the desulfurization effect of the flue gas 200.

[0071] Other configurations and operations of the desulfurization system 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0072] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0073] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," and "example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A desulfurization system, characterized in that, include: The main tower is provided with a flue gas inlet and a flue gas outlet, and a first slurry storage tank is provided at the bottom of the main tower. A primary circulating spray device is provided inside the main tower and located between the flue gas inlet and the flue gas outlet, and the primary circulating spray device is connected to the first slurry storage tank; A first stirring device is installed in the main tower for stirring the slurry in the first slurry storage tank. The first driving component includes a first driving member, which is used to drive the primary circulating spray device and the first stirring device.

2. The desulfurization system according to claim 1, characterized in that, The first-stage circulating spray device consists of N units, where N is an integer greater than or equal to 2. The first driving component drives one of the first-stage circulating spray devices. The first driving component also includes a second driving component, of which there are N-1 units. Each of the second driving components corresponds one-to-one with one of the N-1 first-stage circulating spray devices. And / or, the first drive unit is a variable frequency pump.

3. The desulfurization system according to claim 1, characterized in that, Also includes: The secondary tower has a second slurry storage tank at its bottom; A secondary circulating spray device is provided inside the main tower and located between the flue gas outlet and the primary circulating spray device. The secondary circulating spray device is connected to the second slurry storage tank. The second stirring device is located in the secondary tower and is used to stir the slurry in the second slurry storage tank. The second drive assembly includes a third drive member, which is used to drive the secondary circulating spray device and the second stirring device.

4. The desulfurization system according to claim 3, characterized in that, Also includes: A heat exchange device, comprising a first heat exchange channel and a second heat exchange channel, wherein the first heat exchange channel is connected in series between the second slurry storage tank and the secondary circulating spray device, and a cooling liquid flows through the second heat exchange channel, the cooling liquid in the second heat exchange channel being used to cool the slurry in the first heat exchange channel.

5. The desulfurization system according to claim 4, characterized in that, The secondary circulating spray device comprises M units, where M is an integer greater than or equal to 2. The second drive assembly further includes a fourth drive component, which comprises M-1 units. The desulfurization system also includes: A connecting pipe is provided, one end of which is connected to M of the secondary circulating spray devices, and the other end of which is connected to the third driving element and M-1 of the fourth driving elements. The first heat exchange channel is located on the connecting pipe.

6. The desulfurization system according to any one of claims 3-5, characterized in that, The third driving component is a variable frequency pump.

7. The desulfurization system according to claim 3, characterized in that, Also includes: A demisting device is provided on at least one side of the upper and lower sides of the secondary circulating spray device for demisting flue gas.

8. The desulfurization system according to claim 3, characterized in that, Also includes: A liquid collection bowl, located between the primary circulating spray device and the secondary circulating spray device; A liquid collection inlet pipe, one end of which is connected to the bottom of the liquid collection bowl and the other end of which is connected to at least one of the secondary tower and the main tower.

9. The desulfurization system according to claim 8, characterized in that, The inner circumferential wall of the main tower is provided with a flow guide cone, which extends along the circumferential direction of the main tower and is located above the liquid collection bowl.

10. The desulfurization system according to claim 8, characterized in that, The main tower is also provided with a packing layer, which is located between the liquid collection bowl and the secondary circulating spray device. The packing layer contains a plurality of through holes for the flow of flue gas, and the plurality of through holes bend and extend along the thickness direction of the packing layer.

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