Energy-saving type waste gas desulfurization tower with double synergism

Abstract

The utility model discloses a double synergistic energy-saving waste gas desulfurization tower, which belongs to the flue gas wet desulphurization technology, and comprises synergistic devices positioned in the desulfurization tower, the synergistic devices comprise a first synergistic device and a second synergistic device, the first synergistic device comprises a tray, a plurality of sieve pores are arranged on the tray, and the sieve pores are communicated with the first synergistic device and the second synergistic device. The second synergistic device comprises a tube grid assembly, the tube grid assembly comprises a plurality of tube grids which are horizontally arranged in parallel, and gaps are formed among the tube grids. Flue gas in the desulfurization tower is fully purified through the double synergistic devices, the first synergistic device is a tray, sieve pores in the tray serve as gas-liquid rising and liquid-phase falling channels, the second synergistic device is a pipe grid, and spraying liquid flows along the pipe grid to form a liquid film. When the waste gas passes through the liquid film, the physical mass transfer and the chemical reaction are carried out at the same time, and the pollutants and the spraying liquid are in full contact and react. According to the scheme, the purification efficiency of pollutants in smoke dust by the desulfurization tower is improved, and the purification effect is improved.

Description

Technical Field

[0001] The utility model relates to a desulfurization tower, and more specifically, to a double-efficiency-enhancing and energy-saving waste gas desulfurization tower. Background Art

[0002] During the production process of coal-fired boilers, the large amount of coal combustion will produce polluting gases or impurities, leading to environmental problems. Among them, pollutants such as SO2 and H2S can not only directly harm the ecological environment, but also are important precursors for the formation of acid rain and haze. At present, the main technologies for wet desulfurization are limestone-gypsum wet method, magnesium oxide wet method, ammonia method, sodium-calcium double alkali method, single alkali method, and seawater method. The core equipment is the wet desulfurization tower. The traditional wet spray tower uses an empty tower spray. Increasing the liquid-gas ratio can improve the desulfurization efficiency, but a high liquid-gas ratio increases the amount of circulating slurry, increases the power consumption of the circulating pump, and increases the operating cost of desulfurization.

[0003] For example: Chinese patent announcement number CN216744361U, announcement date June 14, 2022, the name of the utility model is a smoke purification tower and a pyrolysis gasification furnace equipped with a smoke purification tower; the application discloses a purification tower structure, a powerful spray head is arranged at the upper end of the inner side of the purification tower body, a smoke purification net composed of multiple layers of fine meshes is arranged in the middle of the inner side of the purification tower body, and a smoke precipitation chamber is arranged at the bottom of the inner side of the purification tower body; this scheme can improve the smoke removal effect and purify the emitted flue gas, but the purification efficiency of this scheme is still low, the energy consumption is high, and the operating cost is relatively high. Utility Model Content

[0004] The utility model overcomes the problems of low purification efficiency and high energy consumption of existing smoke desulfurization towers, and provides a double-efficiency energy-saving exhaust gas desulfurization tower. This scheme improves the purification efficiency of the desulfurization tower for pollutants in the smoke, improves the purification effect, and also reduces the operating cost.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a double-efficiency energy-saving exhaust gas desulfurization tower, including an efficiency-enhancing device located in the desulfurization tower, the efficiency-enhancing device including a first efficiency-enhancing device and a second efficiency-enhancing device, the first efficiency-enhancing device including a tray, the tray is provided with a plurality of sieve holes, the second efficiency-enhancing device including a pipe grid assembly, the pipe grid assembly including a plurality of pipe grids arranged horizontally and in parallel, and gaps are provided between the pipe grids. In this solution, the flue gas inside the desulfurization tower is fully purified by the double efficiency-enhancing device, the first efficiency-enhancing device is a tray, the sieve holes on the tray mountain serve as gas-liquid ascending and liquid phase descending channels, when the gas-liquid two phases pass through the sieve holes, a foam layer is formed on the tray, the bubbles in the foam layer are constantly broken and merged, which can greatly enhance the mass transfer of the gas-liquid two phases, and evenly distribute the exhaust gas flow field in the desulfurization tower, after the exhaust gas passes through this layer of foam, the dirt is adsorbed, and the exhaust gas is purified; the second efficiency-enhancing device is a pipe grid, the spray liquid flows along the pipe grid to form a liquid film. When the exhaust gas passes through the liquid film, the gas-liquid surface contacts fully, physical mass transfer and chemical reaction proceed simultaneously, and the pollutants fully contact and react with the spray liquid. In addition, when the exhaust gas passes through the pipe grid, a strong turbulence is formed, which increases the residence time of the exhaust gas at the pipe grid, thereby improving the purification efficiency.

[0006] Preferably, the tray includes a plurality of grid plates and a first support frame, and the grid plates are arranged and fixed on the first support frame. The mesh holes on the grid plates are sieve holes for gas and liquid to pass through, and the first support frame is used to support the grid plates so that the grid plates are fixed in the desulfurization tower.

[0007] Preferably, the tube grid assembly further comprises a second support frame, and the tube grid is arranged and fixed on the second support frame. The tube grid assembly is a Venturi bar, and there are gaps between the tube grids so that the spray liquid and exhaust gas can pass through; the support frame is used to support the tube grid assembly so that the tube grid is fixed in the desulfurization tower.

[0008] Preferably, the second efficiency enhancement device comprises at least two layers of tube grid components, and the tube grid components are arranged in a staggered manner. The tube grid components are arranged in multiple layers, so that the spray liquid can form a liquid film through the staggered tube grids, so that the exhaust gas and the spray liquid can be fully contacted, thereby improving the purification effect.

[0009] Preferably, a spray layer is provided above the efficiency enhancement device, and the spray layer is provided with at least two layers. The spray layer can spray out spray liquid, and the spray liquid can react with pollutants in the exhaust gas to eliminate the pollutants in the exhaust gas; the spray layer is provided with multiple layers to ensure that there is enough spray liquid to fully react and contact with the exhaust gas, thereby improving the purification effect.

[0010] Preferably, a slurry pool is provided at the bottom of the desulfurization tower, and the slurry pool is connected to the spray layer through a liquid infusion pipe, and a driver is provided on the liquid infusion pipe. The slurry pool provides a reaction solution for the entire desulfurization tower, and after the driver is in operation, the reaction solution in the slurry pool can be output to the spray layer through the liquid infusion pipe, and sprayed out from the spray layer to form a spray liquid, which purifies the exhaust gas and reacts with the pollutants in the exhaust gas.

[0011] Preferably, a mixer is provided at the output end of the driver, and an absorbent is provided in the mixer. The absorbent is added to the mixer so that the slurry in the mixer is mixed with the absorbent, and the pH value of the reaction solution is adjusted so that the reaction solution transported to the spray layer can continue to react with the exhaust gas. Increasing the pH value can speed up the absorption of acidic substances, thereby improving the purification effect of the desulfurization tower.

[0012] Preferably, a waste gas inlet is provided between the slurry pool and the efficiency enhancement device. Waste gas generated by the combustion of fossil fuels enters between the slurry pool and the efficiency enhancement device through the waste gas inlet, and spray liquid flows down the efficiency enhancement device to preliminarily purify the waste gas, and the spray liquid returns to the slurry pool for recycling.

[0013] Preferably, a demister is arranged above the spray layer, which can eliminate the mist droplets in the saturated exhaust gas passing through the spray layer, converting it into purified exhaust gas, which is then discharged from the desulfurization tower.

[0014] Preferably, the top of the desulfurization tower is a waste gas outlet, which is used to discharge the purified waste gas for subsequent treatment.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows: (1) the dual-efficiency enhancement device greatly enhances the mass transfer of gas-liquid two phases, enhances the gas-liquid contact, uniformly distributes the exhaust gas flow field in the desulfurization tower, increases the residence time of the exhaust gas in the tower, and thus improves the pollutant purification efficiency; (2) the two-stage efficiency enhancement layer reduces the gas-liquid ratio, greatly reduces the flow rate of the circulation pump, reduces energy consumption, can reduce the liquid-gas ratio by 20%-25%, reduce the use of one circulation pump, and reduce power consumption by 15%-20%, thereby achieving energy-saving effects; (3) the absorbent slurry mixer at the outlet of the circulation pump can allow the absorbent to enter the desulfurization tower from the spray layer, adjust and increase the pH of the dual-efficiency enhancement device, thereby improving the purification efficiency of acidic pollutants; (4) the scheme is simple and easy to implement, the cost is not high, and it has high cost performance and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the utility model.

[0017] Figure 2 It is a schematic diagram of the first efficiency-enhancing device of the utility model.

[0018] Figure 3 This is a schematic diagram of the first support frame of the utility model.

[0019] Figure 4 It is a schematic diagram of the second efficiency-enhancing device of the utility model.

[0020] Figure 5 It is a schematic elevation view of the second efficiency-enhancing device of the utility model.

[0021] In the figure: 1. desulfurization tower, 2. first efficiency enhancement device, 3. second efficiency enhancement device, 4. tray, 5. sieve hole, 6. pipe grid assembly, 7. pipe grid, 8. first support frame, 81. ring body, 82. support rod, 83. support member, 9. grid plate, 10. second support frame, 101. second ring body, 102. second support rod, 11. spray layer, 111. first desulfurization spray layer, 112. second desulfurization spray layer, 113. third desulfurization spray layer, 12. slurry pool, 13. driver, 14. mixer, 15. exhaust gas inlet, 16. demister, 17. exhaust gas outlet, 18. first connecting piece, 19. second connecting piece, 20. infusion pipe. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Example 1: Figure 1 A double-efficiency energy-saving waste gas desulfurization tower shown in the figure includes a desulfurization tower 1. A slurry pool 12, an efficiency-enhancing device, a spray layer 11 and a demister 16 are arranged in sequence from bottom to top inside the desulfurization tower 1. A waste gas inlet 15 is opened between the slurry pool 12 and the efficiency-enhancing device and on the side wall of the desulfurization tower 1. The waste gas generated by combustion enters the desulfurization tower 1 through the waste gas inlet 15; a waste gas outlet 17 is arranged above the demister 16, that is, at the top of the desulfurization tower 1, and the waste gas outlet 17 is also arranged on one side of the desulfurization tower 1.

[0024] Furthermore, the efficiency enhancing device includes a first efficiency enhancing device 2 and a second efficiency enhancing device 3. The first efficiency enhancing device 2 is located at the lower side of the second efficiency enhancing device 3. The first efficiency enhancing device 2 is a tray 4 and a first support frame 8 fixedly connected to the tray 4. The tray 4 is composed of a plurality of grid plates 9.

[0025] like Figure 2As shown, the grid plate 9 is a modular structure, and a number of small rectangular sieve holes 5 are arranged on the grid plate 9. In this embodiment, the tray 4 composed of the grid plates 9 is circular and adapted to the cylindrical cavity inside the desulfurization tower 1. The grid plates 9 are arranged symmetrically about the diameter of the tray 4, and the grid plates 9 on both sides of the diameter are connected together by the first connecting member 18. Specifically, the first connecting member 18 can adopt a bolt structure or a snap-on structure, and two identical grid plates 9 are arranged relative to each other. Grid plates 9 of different sizes are arranged in a direction perpendicular to the diameter, and all grid plates 9 are combined into a circle to form a tray 4. Grid plates 9 of different sizes (grid plates 9 adjacent to each other in the figure) also need to be fixed by connecting members. Similarly, the connecting members can be fixed by bolts or snap-on parts, and assembled with some sieve hole 5 structures; in order to prevent the acid solution inside the desulfurization tower 1 from corroding the connecting members (including the first connecting member 18), plastic parts can be preferably used as connecting members. Among them, the opening rate of the tray 4 is generally controlled at about 40%, and the opening aperture is 2 to 4 cm. The tray 4 has a thickness of 2.5-3 mm and is made of 2205 stainless steel.

[0026] like Figure 2 or Figure 3 As shown, the first support frame 8 includes a circular ring body 81 and three support rods 82 arranged in parallel on the ring body 81. The support rods 82 and the ring body 81 are fixed by welding, so that the first support frame 8 has high stability, wherein both ends of the support rods 82 protrude from the edges of the ring body 81. It should be noted that an annular trough structure (not shown in the figure) is provided on the inner wall of the desulfurization tower 1, and the support rods 82 of the first support frame 8 protrude from the ring body 81, so that the protruding part of the support rods 82 can be stuck in the trough structure, that is, the first support frame 8 is limited inside the desulfurization tower 1 to prevent it from falling to the bottom of the desulfurization tower 1 due to the action of the spray liquid. In order to better fix the tray 4 on the first support frame 8, a number of support members 83 are evenly arranged circumferentially on the ring body 81 of the first support frame 8, such as Figure 2 As shown, the support member 83 is a rectangular plastic sheet structure, one end of the support member 83 is welded to the ring body 81, and the other end of the support member 83 extends a short distance toward the center of the ring body 81. The radial dimension of the tray 4 is adapted to the dimension of the ring body 81, so that the tray 4 will abut against the support member 83 and can be stably fixed on the first support frame 8.

[0027] The tray 4 is provided with sieve holes 5 as gas-liquid ascending and liquid-phase descending channels. When the gas and liquid phases pass through the sieve holes 5, a foam layer is formed on the sieve plate 5. The bubbles in the foam layer are constantly broken, merged, and regenerated, which can greatly enhance the mass transfer of the gas and liquid phases and evenly distribute the exhaust gas flow field in the desulfurization tower 1. After the exhaust gas passes through this layer of foam, the pollutants are adsorbed and the exhaust gas is purified.

[0028] The second efficiency enhancement device 3 includes a tube grid assembly 6 and a second support frame 10 fixedly connected to the tube grid assembly 6. The tube grid assembly 6 includes a plurality of tube grids 7. The tube grids 7 are symmetrically and parallelly arranged to form a circular structure, such as Figure 3 As shown, the tube grids 7 on the tube grid assembly 6 are arranged symmetrically up and down; taking the tube grid 7 on the upper side as an example, the adjacent tube grids 7 are parallel and have different lengths, and the tube grid 7 on the upper side forms a semicircular structure, with a certain gap between the tube grids 7, and the adjacent tube grids 7 are fixed by the second connecting member 19, and the connection position is located near the outer circular end of the tube grid 7. In the figure, the tube grids 7 on the upper and lower sides are also fixed together to form a circular structure. Among them, the diameter of the tube grid 7 is φ63, the horizontal center distance is 90mm, the vertical center distance is 80mm, and the total height of the module is 360mm. The material of the tube grid 7 can be PP or fiberglass.

[0029] The structure of the second support frame 10 is consistent with that of the first support frame 8. For the purpose of distinction, they are respectively defined as the second ring body 101 and the second support rod 102. It should be noted that the arrangement of the tube grid 7 is perpendicular to the second support rod 102. Only in this way can the second support rod 102 support the tube grid assembly 6.

[0030] like Figure 5 As shown, in this embodiment, the tube grid assembly 6 is provided with four layers, the tube grid assembly 6 is a Venturi bar, and the tube grid assemblies 6 of two adjacent layers are staggered, so that the upper and lower tube grids 7 are not in the same vertical direction, that is, the gaps between the tube grids 7 are not in the same vertical direction. The gas-liquid two-phase passing through the tube grid assembly 6 can generate turbulence, thereby improving the purification effect of the exhaust gas.

[0031] like Figure 1 As shown, a spray layer 11 is also provided above the second efficiency enhancement device 3, and an infusion port is provided at the bottom of the slurry pool 12, and an infusion pipe 20 is connected to the infusion port to communicate with the spray layer 11. Specifically, the spray layer 11 includes three layers, and is sequentially spaced from bottom to top as a first desulfurization spray layer 111, a second desulfurization spray layer 112, and a third desulfurization spray layer 113. A plurality of nozzles are distributed inside each spray layer 11, and a driver 13 is also provided on the infusion pipe 20. The driver 13 is specifically a circulating pump, which can pump the slurry or reaction solution at the bottom of the slurry pool 12 into the infusion pipe 20, and then spray it out from the spray layer 11, so as to purify the exhaust gas at the bottom.

[0032] The second efficiency-enhancing device 3 is a tube grid 7, and four layers of tube grids 7 are arranged in a staggered manner. The spray liquid is sprayed on the tube grid 7 from top to bottom and flows along the tube grid 7 to form a liquid film. When the exhaust gas passes through the liquid film, the gas-liquid surface is fully in contact, physical mass transfer and chemical reaction are carried out simultaneously, and the pollutants are fully in contact with and react with the spray liquid. In addition, when the exhaust gas passes through the tube grid 7, a strong turbulence will be formed, which increases the residence time of the exhaust gas at the tube grid 7, thereby improving the purification efficiency. At the same time, during the horizontal movement of the exhaust gas, there is no need to overcome the gravity of the slurry itself when contacting and penetrating the liquid film, thereby reducing the resistance of the exhaust gas system operation and achieving the effect of pollutant washing and purification under low resistance.

[0033] A demister 16 is also provided above the spray layer 11. The demister 16 is located between the exhaust gas outlet 17 and the spray layer 11. The demister 16 can eliminate the mist droplets in the saturated exhaust gas passing through the spray layer 11 to form purified exhaust gas, which is then discharged through the desulfurization tower.

[0034] Example 2: Figure 1 A double-efficiency energy-saving waste gas desulfurization tower shown in the figure includes a desulfurization tower 1. A slurry pool 12, an efficiency-enhancing device, a spray layer 11 and a demister 16 are arranged in sequence from bottom to top inside the desulfurization tower 1. A waste gas inlet 15 is opened between the slurry pool 12 and the efficiency-enhancing device and on the side wall of the desulfurization tower 1. The waste gas generated by combustion enters the desulfurization tower 1 through the waste gas inlet 15; a waste gas outlet 17 is arranged above the demister 16, that is, at the top of the desulfurization tower 1, and the waste gas outlet 17 is also arranged on one side of the desulfurization tower 1.

[0035] Furthermore, the efficiency enhancing device includes a first efficiency enhancing device 2 and a second efficiency enhancing device 3. The first efficiency enhancing device 2 is located at the lower side of the second efficiency enhancing device 3. The first efficiency enhancing device 2 is a tray 4 and a first support frame 8 fixedly connected to the tray 4. The tray 4 is composed of a plurality of grid plates 9.

[0036] like Figure 2As shown, the grid plate 9 is a modular structure, and a number of small rectangular sieve holes 5 are arranged on the grid plate 9. In this embodiment, the tray 4 composed of the grid plates 9 is circular and adapted to the cylindrical cavity inside the desulfurization tower 1. The grid plates 9 are arranged symmetrically about the diameter of the tray 4, and the grid plates 9 on both sides of the diameter are connected together by the first connecting member 18. Specifically, the first connecting member 18 can adopt a bolt structure or a snap-on structure, and two identical grid plates 9 are arranged relative to each other. Grid plates 9 of different sizes are arranged in a direction perpendicular to the diameter, and all grid plates 9 are combined into a circle to form a tray 4. Grid plates 9 of different sizes (grid plates 9 adjacent to each other in the figure) also need to be fixed by connecting members. Similarly, the connecting members can be fixed by bolts or snap-on parts, and assembled with some sieve hole 5 structures; in order to prevent the acid solution inside the desulfurization tower 1 from corroding the connecting members (including the first connecting member 18), plastic parts can be preferably used as connecting members. Among them, the opening rate of the tray 4 is generally controlled at about 40%, and the opening aperture is 2 to 4 cm. The tray 4 has a thickness of 2.5-3 mm and is made of 2205 stainless steel.

[0037] like Figure 2 or Figure 3 As shown, the first support frame 8 includes a circular ring body 81 and three support rods 82 arranged in parallel on the ring body 81. The support rods 82 and the ring body 81 are fixed by welding, so that the first support frame 8 has high stability, wherein both ends of the support rods 82 protrude from the edges of the ring body 81. It should be noted that an annular trough structure (not shown in the figure) is provided on the inner wall of the desulfurization tower 1, and the support rods 82 of the first support frame 8 protrude from the ring body 81, so that the protruding part of the support rods 82 can be stuck in the trough structure, that is, the first support frame 8 is limited inside the desulfurization tower 1 to prevent it from falling to the bottom of the desulfurization tower 1 due to the action of the spray liquid. In order to better fix the tray 4 on the first support frame 8, a number of support members 83 are evenly arranged circumferentially on the ring body 81 of the first support frame 8, such as Figure 2 As shown, the support member 83 is a rectangular plastic sheet structure, one end of the support member 83 is welded to the ring body 81, and the other end of the support member 83 extends a short distance toward the center of the ring body 81. The radial dimension of the tray 4 is adapted to the dimension of the ring body 81, so that the tray 4 will abut against the support member 83 and can be stably fixed on the first support frame 8.

[0038] The tray 4 is provided with sieve holes 5 as gas-liquid ascending and liquid-phase descending channels. When the gas and liquid phases pass through the sieve holes 5, a foam layer is formed on the sieve plate 5. The bubbles in the foam layer are constantly broken, merged, and regenerated, which can greatly enhance the mass transfer of the gas and liquid phases and evenly distribute the exhaust gas flow field in the desulfurization tower 1. After the exhaust gas passes through this layer of foam, the pollutants are adsorbed and the exhaust gas is purified.

[0039] The second efficiency enhancement device 3 includes a tube grid assembly 6 and a second support frame 10 fixedly connected to the tube grid assembly 6. The tube grid assembly 6 includes a plurality of tube grids 7. The tube grids 7 are symmetrically and parallelly arranged to form a circular structure, such as Figure 3 As shown, the tube grids 7 on the tube grid assembly 6 are arranged symmetrically up and down; taking the tube grid 7 on the upper side as an example, the adjacent tube grids 7 are parallel and have different lengths, and the tube grid 7 on the upper side forms a semicircular structure, with a certain gap between the tube grids 7, and the adjacent tube grids 7 are fixed by the second connecting member 19, and the connection position is located near the outer circular end of the tube grid 7. In the figure, the tube grids 7 on the upper and lower sides are also fixed together to form a circular structure. Among them, the diameter of the tube grid 7 is φ63, the horizontal center distance is 90mm, the vertical center distance is 80mm, and the total height of the module is 360mm. The material of the tube grid 7 can be PP or fiberglass.

[0040] The structure of the second support frame 10 is consistent with that of the first support frame 8. For the purpose of distinction, they are respectively defined as the second ring body 101 and the second support rod 102. It should be noted that the arrangement of the tube grid 7 is perpendicular to the second support rod 102. Only in this way can the second support rod 102 support the tube grid assembly 6.

[0041] like Figure 5 As shown, in this embodiment, the tube grid assembly 6 is provided with four layers, the tube grid assembly 6 is a Venturi bar, and the tube grid assemblies 6 of two adjacent layers are staggered, so that the upper and lower tube grids 7 are not in the same vertical direction, that is, the gaps between the tube grids 7 are not in the same vertical direction. The gas-liquid two-phase passing through the tube grid assembly 6 can generate turbulence, thereby improving the purification effect of the exhaust gas.

[0042] like Figure 1 As shown, a spray layer 11 is also provided above the second efficiency enhancement device 3, and an infusion port is provided at the bottom of the slurry pool 12, and an infusion pipe 20 is connected to the infusion port to communicate with the spray layer 11. Specifically, the spray layer 11 includes three layers, and is sequentially spaced from bottom to top as a first desulfurization spray layer 111, a second desulfurization spray layer 112, and a third desulfurization spray layer 113. A plurality of nozzles are distributed inside each spray layer 11, and a driver 13 is also provided on the infusion pipe 20. The driver 13 is specifically a circulating pump, which can pump the slurry or reaction solution at the bottom of the slurry pool 12 into the infusion pipe 20, and then spray it out from the spray layer 11, so as to purify the exhaust gas at the bottom.

[0043] The second efficiency-enhancing device 3 is a tube grid 7, and four layers of tube grids 7 are arranged in a staggered manner. The spray liquid is sprayed on the tube grid 7 from top to bottom and flows along the tube grid 7 to form a liquid film. When the exhaust gas passes through the liquid film, the gas-liquid surface is fully in contact, physical mass transfer and chemical reaction are carried out simultaneously, and the pollutants are fully in contact with and react with the spray liquid. In addition, when the exhaust gas passes through the tube grid 7, a strong turbulence will be formed, which increases the residence time of the exhaust gas at the tube grid 7, thereby improving the purification efficiency. At the same time, during the horizontal movement of the exhaust gas, there is no need to overcome the gravity of the slurry itself when contacting and penetrating the liquid film, thereby reducing the resistance of the exhaust gas system operation and achieving the effect of pollutant washing and purification under low resistance.

[0044] A demister 16 is also provided above the spray layer 11. The demister 16 is located between the exhaust gas outlet 17 and the spray layer 11. The demister 16 can eliminate the mist droplets in the saturated exhaust gas passing through the spray layer 11 to form purified exhaust gas, which is then discharged through the desulfurization tower.

[0045] It should be noted that a mixer 14 is also provided on the infusion tube 20. The mixer 14 is located on the infusion tube 20 between the driver 13 and the spray layer 11. The slurry or reaction solution in the infusion tube 20 will flow through the mixer 14, and the mixer 14 is also connected to a pharmaceutical device (not shown in the figure). The pharmaceutical device will transport the absorbent into the mixer 14, so that the absorbent in the mixer 14 will be integrated into the slurry or reaction solution.

[0046] The pH of the desulfurization tower 1 can be adjusted by adjusting the amount of absorbent added in the mixer 14. In the slurry pool 12 of the desulfurization tower 1, the pH value of the slurry is adjusted to about 5.5, which can prevent the desulfurization tower 1 from scaling and ensure safe and reliable operation of the system. The absorbent enters the spray layer 11 after passing through the mixer 14, which can increase the pH value of the slurry of the first efficiency enhancement device 2 and the second efficiency enhancement device 3. In the tray 4 and the pipe grid 7, the pH of the slurry or reaction solution is about 6.3. Increasing the pH value can accelerate the absorption rate of acidic substances, thereby improving the purification effect of the desulfurization tower 1.

[0047] The specific environment of this embodiment is as follows: a 180t / h coal-fired boiler, a flue gas volume of 330,000m3 / h, a flue gas temperature of 135°C, an original SO2 concentration of <2500mg / Nm3, a limestone-gypsum wet desulfurization process, and a desulfurization efficiency of ≥98.6%. The diameter of the desulfurization tower is 6.6m. After the efficiency enhancement device is set, due to its uniform distribution effect, the distribution of flue gas in the tower is significantly improved, the high-speed airflow zone disappears, and the gas-liquid contact is improved. The tube constituting the second efficiency enhancement device is round, with a smooth surface, and it is not easy to adhere to solids. The flow velocity at the gap is large, and the flow effect of the gradual contraction and expansion between the two tubes forms a strong gas-liquid two-phase turbulence. The flue gas passes through the gap between adjacent tubes at high speed, constantly flushing the tube grid, which can avoid scaling. Install 4 circulating pumps, and put 2 circulating pumps into use to meet the desulfurization efficiency. Reduce the liquid-gas ratio by 25%, saving 160 kWh of electricity consumption.

Claims

1. A double-efficiency energy-saving exhaust gas desulfurization tower, characterized in that: It includes an efficiency-enhancing device located in a desulfurization tower, the efficiency-enhancing device includes a first efficiency-enhancing device and a second efficiency-enhancing device, the first efficiency-enhancing device includes a tray, the tray is provided with a plurality of sieve holes, the second efficiency-enhancing device includes a pipe grid assembly, the pipe grid assembly includes a plurality of pipe grids arranged horizontally and in parallel, and gaps are provided between the pipe grids.

2. The double-efficiency energy-saving exhaust gas desulfurization tower according to claim 1 is characterized in that: The tray comprises a plurality of grid plates and a first support frame, and the grid plates are arranged and fixed on the first support frame.

3. The double-efficiency energy-saving exhaust gas desulfurization tower according to claim 1 is characterized in that: The tube grid assembly also includes a second support frame, and the tube grid is arranged and fixed on the second support frame.

4. The double-efficiency energy-saving exhaust gas desulfurization tower according to claim 3 is characterized in that: The second efficiency enhancement device includes at least two layers of tube grid assemblies, and the tube grid assemblies are staggered.

5. A double-efficiency energy-saving exhaust gas desulfurization tower according to any one of claims 1 to 4, characterized in that: A spray layer is arranged above the efficiency enhancement device, and the spray layer is provided with at least two layers.

6. The double-efficiency energy-saving exhaust gas desulfurization tower according to claim 5 is characterized in that: A slurry pool is arranged at the bottom of the desulfurization tower. The slurry pool is connected to the spray layer through a liquid infusion pipe, and a driver is arranged on the liquid infusion pipe.

7. The double-efficiency energy-saving exhaust gas desulfurization tower according to claim 6 is characterized in that: The output end of the driver is provided with a mixer, and an absorbent is arranged in the mixer.

8. The double-efficiency energy-saving exhaust gas desulfurization tower according to claim 6 is characterized in that: A waste gas inlet is arranged between the slurry pool and the efficiency enhancement device.

9. The double-efficiency energy-saving exhaust gas desulfurization tower according to claim 5 is characterized in that: A demister is arranged above the spray layer.

10. A double-efficiency energy-saving exhaust gas desulfurization tower according to any one of claims 1 to 4, characterized in that: The top of the desulfurization tower is a waste gas outlet.

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