Waste gas purification equipment for green desulfurized gypsum block production

Abstract

The invention relates to the field of waste gas purification, in particular to waste gas purification equipment for green desulfurized gypsum block production, which comprises an inner shell for receiving clear water; a spraying disc is arranged in the inner shell, water is taken from the inner shell by the spraying disc and sprayed out in a mist shape, a spraying area exists between the spraying disc and the clear water level in the vertical direction, a breather pipe for discharging waste gas into the inner shell is vertically arranged in the inner shell, and the lower end of the breather pipe extends to the position below the clear water level in the inner shell. An outer shell communicated with the inner shell is arranged around the periphery of the inner shell, a sodium hydroxide solution is stored in the outer shell, and waste gas is firstly injected into clear water in the inner shell, then is discharged into the outer shell through the spraying area and finally reacts with the sodium hydroxide solution to be discharged. The heat recovery process and the purification treatment process are combined, and the recovery efficiency of waste gas heat is improved.

Description

Technical Field

[0001] The present invention relates to the field of waste gas purification, and particularly to a waste gas purification device for the production of green desulfurized gypsum blocks. Background Art

[0002] During the production process of gypsum blocks, some toxic and pungent gases are usually emitted, mainly sulfur dioxide. These gases emitted into the air will not only cause harm to the bodies of operators, but also pollute the surrounding air environment. At the same time, the gases also contain heat, and the dissipation of this heat into the air will waste heat resources.

[0003] Chinese Patent Publication No. CN215539191U discloses a waste gas purification device for the production of green desulfurized gypsum blocks, including: two support plates; a top plate fixedly installed on the tops of the two support plates; an installation frame disposed on the outer walls of the two support plates close to each other; a fixed box fixedly installed on the inner wall of the top of the installation frame; an air inlet hopper fixedly installed on the inner wall of the installation frame, and the top end of the air inlet hopper is communicated with the fixed box; a collection box fixedly installed on the inner wall of the top of the installation frame; a connecting through groove opened on one inner wall of the collection box and communicated with the fixed box; a filter box fixedly installed on the top of the top plate; a suction fan fixedly installed on the top of the top plate; a guide air pipe fixedly installed on the air inlet of the suction fan, and the other end of the guide air pipe is fixedly connected to the outer wall of one side of the filter box; a heat conduction mechanism disposed on any one of the support plates.

[0004] The above solution only filters sulfur dioxide through activated carbon and a filter plate, resulting in a relatively low filtering effect for sulfur dioxide. At the same time, the residence time of the high-temperature waste gas containing sulfur dioxide in the fixed box is short, and the flowing water cannot fully absorb the heat in the waste gas, resulting in the waste heat energy of the waste gas not being reasonably collected. Moreover, a filter screen is provided before the activated carbon, but there is no device for cleaning the filter screen, which will cause the filter screen to become blocked after long-term use. Summary of the Invention

[0005] To solve the above problems, an exhaust gas purification device for the production of green desulfurized gypsum blocks is provided. By setting an inner shell and an outer shell, injecting clear water into the inner shell, and inserting the ventilation pipe below the water level of the clear water, the exhaust gas discharged into the inner shell will first contact the clear water at the bottom of the inner shell. At this time, part of the dust in the exhaust gas is removed by the clear water, and the heat of the exhaust gas is also initially absorbed. A spray tray is arranged above the water level of the clear water. There is a spray area between the spray tray and the water level of the clear water. When the exhaust gas rises from the clear water to the spray area, the dust in the exhaust gas comes into full contact with the atomized water, the dust is fully removed, and the heat of the exhaust gas is also fully absorbed. Compared with the traditional heat recovery method, the heat recovery efficiency of the present invention is higher. At the same time, the sodium hydroxide stored in the outer shell surrounding the inner shell can react with carbon dioxide and release heat during the reaction. In this way, the outer shell can provide a heat preservation effect for the inner shell, reduce the heat dissipation of the inner shell, and further improve the heat recovery efficiency in the inner shell.

[0006] To solve the problems of the prior art, the present invention provides an exhaust gas purification device for the production of green desulfurized gypsum blocks, which includes an inner shell containing clear water; a spray tray is arranged inside the inner shell. The spray tray takes water from the inner shell and sprays the water in a mist shape. There is a spray area between the spray tray and the water level of the clear water in the vertical direction. A ventilation pipe for discharging exhaust gas into the inner part of the inner shell is vertically arranged in the inner shell. The lower end of the ventilation pipe extends below the water level of the clear water in the inner shell. An outer shell communicating with the inner shell is arranged around the inner shell. Sodium hydroxide solution is stored in the outer shell. The exhaust gas is first injected into the clear water in the inner shell, then passes through the spray area and is discharged into the outer shell, and finally reacts with the sodium hydroxide solution and is discharged.

[0007] Preferably, an injection pipe is communicatively arranged on the outer wall of the inner shell and extends into the sodium hydroxide solution. A sponge is arranged in the inner shell. The exhaust gas passing through the spray area first passes through the sponge and then through the injection pipe.

[0008] Preferably, a sewage discharge shell is horizontally arranged at the bottom of the inner shell. An inlet and an outlet are respectively arranged above and below the sewage discharge shell. The sewage discharge shell is communicated with the inner shell through the inlet. A receiving bin is horizontally movably arranged in the sewage discharge shell. The receiving bin can be communicated with the inlet or the outlet when moving.

[0009] Preferably, a filter screen is arranged at the lower part of the sewage discharge shell and is located between the inlet and the outlet.

[0010] Preferably, an annular partition plate is fixedly arranged along the axis of the inner shell in the inner shell. The partition plate divides the inner shell into a dust collection chamber and a cleaning chamber from the inside to the outside. The dust mixed with the clear water is all located in the dust collection chamber. Filter holes are evenly arranged on the partition plate.

[0011] Preferably, a driving unit for driving the ventilation pipe to rotate around its own axis is provided at the upper part of the ventilation pipe. A scraping rod which is fixedly arranged along the radial direction of the inner shell on the side wall of the ventilation pipe is slidably matched with the inner side wall of the inner ring of the partition plate. The scraping rod rotates synchronously with the ventilation pipe.

[0012] Preferably, a one-way valve is fixedly arranged above the inner shell. A first corrugated pipe is vertically arranged between the one-way valve and the ventilation pipe. Two ends of the first corrugated pipe are respectively connected with the one-way valve and the ventilation pipe. The lower end of the first corrugated pipe is rotationally matched with the ventilation pipe. The one-way valve allows waste gas to flow into the first corrugated pipe. The ventilation pipe intermittently moves up and down in the vertical direction.

[0013] Preferably, a lifting unit for driving the ventilation pipe to move in the vertical direction is arranged above the ventilation pipe. The lifting unit includes a winder arranged at the upper part of the inner shell. A towing rope is wound in the winder. A lifting plate which can drive the ventilation pipe to move up and down synchronously is fixedly arranged at the end of the towing rope. The ventilation pipe is rotationally matched with the lifting plate.

[0014] Preferably, a second corrugated pipe is vertically arranged between the lifting plate and the top of the inner shell. Two ends of the second corrugated pipe are respectively fixedly connected with the lifting plate and the top of the inner shell. The lifting plate is of a circular structure. The diameter of the second corrugated pipe is the same as that of the lifting plate.

[0015] Preferably, a collection box for collecting clear water is arranged below the filter screen. A return pipe is communicated between the collection box and the bottom of the inner shell. A water pump is arranged on the return pipe.

[0016] The beneficial effects of the present invention compared with the prior art are as follows:

[0017] 1. By arranging the inner shell and the outer shell, injecting clear water into the inner shell, and inserting the ventilation pipe below the clear water level at the same time, the waste gas discharged into the inner shell will first contact the clear water at the bottom of the inner shell. At this time, part of the dust in the waste gas is absorbed by the clear water, and the heat of the waste gas is also initially absorbed. A spray tray is arranged above the clear water level. There is a spray area between the spray tray and the clear water level. When the waste gas rises from the clear water to the spray area, the dust in the waste gas fully contacts the atomized water, the dust is fully removed, and the heat of the waste gas is also fully absorbed. Compared with the traditional heat recovery method, the heat recovery efficiency of the present invention is higher. At the same time, the sodium hydroxide stored in the outer shell surrounding the inner shell can react with carbon dioxide and release heat during the reaction. In this way, the outer shell can provide heat preservation for the inner shell, reduce the heat dissipation of the inner shell, and further improve the heat recovery efficiency in the inner shell.

[0018] 2. By arranging sponge in the inner shell, after the waste gas passes through the spraying area, it first passes through the sponge and then through the injection pipe. In this way, the water vapor rising with the waste gas in the spraying area will be intercepted by the sponge, and the sponge can reduce the humidity of the waste gas, so that the water vapor will not enter the outer shell along with the waste gas. After long-term use, the sponge still has an interception effect on the water vapor. This is because when the sponge absorbs water to saturation under the influence of water vapor, the water in the sponge will drip into the inner shell by itself. At this time, the temperature of the waste gas is relatively low and cannot heat the sponge, and the water in the sponge will not evaporate, avoiding the reduction of the concentration of the sodium hydroxide solution by water vapor. At the same time, the sponge can also intercept dust, preventing the residual dust in the waste gas from polluting the sodium hydroxide solution after entering the sodium hydroxide solution. Brief Description of the Drawings

[0019] Figure 1 is a three-dimensional schematic diagram of an exhaust gas purification device for the production of green desulfurized gypsum blocks according to the present invention.

[0020] Figure 2 is a side view of an exhaust gas purification device for the production of green desulfurized gypsum blocks according to the present invention.

[0021] Figure 3 is an exhaust gas purification device for the production of green desulfurized gypsum blocks according to the present invention Figure 2 sectional schematic view at A-A in

[0022] Figure 4 is a sectional three-dimensional schematic of an exhaust gas purification device for the production of green desulfurized gypsum blocks according to the present invention Figure 1 .

[0023] Figure 5 is an exhaust gas purification device for the production of green desulfurized gypsum blocks according to the present invention Figure 4 partial enlarged schematic view at B in

[0024] Figure 6 is an exhaust gas purification device for the production of green desulfurized gypsum blocks according to the present invention Figure 4 partial enlarged schematic view at C in

[0025] Figure 7 is a sectional three-dimensional schematic of an exhaust gas purification device for the production of green desulfurized gypsum blocks according to the present invention Figure 2 .

[0026] Figure 8 is an exhaust gas purification device for the production of green desulfurized gypsum blocks according to the present invention Figure 7 partial enlarged schematic view at D in

[0027] Figure 9 is an exhaust gas purification device for the production of green desulfurized gypsum blocks according to the present inventionFigure 7 Partial enlarged schematic view at E in the middle.

[0028] Figure 10 It is a three-dimensional schematic view of an exhaust gas purification device for the production of green desulfurized gypsum blocks of the present invention after removing the outer shell.

[0029] The reference numerals in the figure are:

[0030] 1. Inner shell; 11. Spray tray; 12. Vent pipe; 121. Scraping rod; 122. Driving unit; 1221. Tooth ring; 1222. Gear; 1223. Rotary driver; 13. Sewage shell; 131. Inlet; 132. Outlet; 14. Receiving bin; 141. Filter screen; 142. Collection box; 143. Water pump; 144. Return pipe; 15. Partition board; 151. Dust collection chamber; 152. Cleaning chamber; 16. First corrugated pipe; 17. Check valve; 18. Lifting unit; 181. Traction rope; 182. Reel; 183. Lifting plate; 19. Second corrugated pipe; 2. Outer shell; 21. Injection pipe; 22. Sponge. Detailed implementation manners

[0031] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be described in further detail below in conjunction with the drawings and specific implementation manners.

[0032] Refer to Figures 1 - 4 : An exhaust gas purification device for the production of green desulfurized gypsum blocks, including an inner shell 1 containing clear water; a spray tray 11 is arranged inside the inner shell 1, the spray tray 11 takes water from the inner shell 1 and sprays the water in a mist shape, there is a spray area between the spray tray 11 and the clear water level in the vertical direction, a vent pipe 12 for discharging exhaust gas into the interior of the inner shell 1 is vertically arranged in the inner shell 1, the lower end of the vent pipe 12 extends below the clear water level in the inner shell 1, an outer shell 2 communicating with the inner shell 1 is arranged around the inner shell 1, sodium hydroxide solution is stored in the outer shell 2, the exhaust gas is first injected into the clear water in the inner shell 1, then discharged into the outer shell 2 through the spray area, and finally reacts with the sodium hydroxide solution and is discharged.

[0033] The waste gas generated during the preparation of desulfurized gypsum blocks mainly consists of carbon dioxide and dust, and the generated waste gas usually has a relatively high temperature and has a certain recoverability of thermal energy. However, in the prior art, the thermal energy recovery efficiency of the waste gas is relatively low. Most of the existing thermal energy recovery is to heat water through the heat of the waste gas. In the prior art, water is usually put into a circulating pipeline, so that the water continuously circulates in the circulating pipeline, and the waste gas flows around the circulating pipeline. In this way, the time for the flowing waste gas to stay around the circulating pipeline is short. Although the waste gas can heat the water in the circulating pipeline, the thermal energy recovery efficiency is low. At the same time, in the prior art, when purifying the sulfur dioxide waste gas containing dust, the thermal energy recovery process and the purification process need to be carried out in two steps. If the thermal energy recovery process is before and the purification process is after, during the initial use, although the thermal energy conversion efficiency of the flowing waste gas is not high, the temperature of the waste gas during thermal energy recovery is relatively high and the thermal energy recovery efficiency is high. However, after using for a period of time, the dust in the waste gas will wrap the outside of the circulating pipeline for the circulating water, resulting in a gradual decrease in the heat transfer efficiency over time; on the contrary, if the purification process is before and the thermal energy recovery process is after, the situation of the circulating pipeline being wrapped by dust can be avoided, but the waste gas needs to go through the purification process before thermal energy recovery, which will cause heat loss and still reduce the thermal energy recovery efficiency.

[0034] In order to avoid the above situation, the structure of the waste gas purification equipment is redesigned so that the waste gas purification equipment combines the thermal energy recovery process and the purification process, that is, during the process of treating the waste gas, the waste gas purification equipment can also synchronously recover the heat in the waste gas, avoiding the reduction of the waste gas heat caused by the traditional separate process treatment. The specific structure and working process of the waste gas purification equipment of the present invention are as follows:

[0035] When treating waste gas, first, the ventilation pipe 12 introduces the waste gas into the inner shell 1. At the same time, the spray tray 11 is started. There is a gap in the vertical direction between the lower end face of the spray tray 11 and the liquid level of the clear water in the inner shell 1. This gap constitutes the spray area. When the waste gas is injected into the clear water in the inner shell 1, part of the dust in the waste gas is adsorbed by the clear water, and the other part rises vertically along with sulfur dioxide. When the sulfur dioxide and the dust not adsorbed by the clear water rise above the liquid level of the clear water and then enter the spray area. Since the water sprayed by the spray tray 11 is in a misty state, the dust rising with sulfur dioxide will be fully adsorbed when passing through the spray area. After the dust is captured and mixed with the misty water, it falls into the lower part of the inner shell 1. During the process of filtering the dust, the waste heat of the waste gas is also fully recovered. When the waste gas just enters the clear water in the inner shell 1, the heat of the waste gas is initially absorbed by the clear water in the inner shell 1. Subsequently, when the waste gas rises and enters the spray area, in addition to removing the dust in the waste gas, the misty water can also come into full contact with the waste gas. Compared with the traditional method of recovering waste heat, directly contacting the water in a misty state with the waste gas greatly improves the absorption efficiency of the heat in the waste gas. When the waste gas passes through the spray area, at this time, the dust in the waste gas has been filtered. When the sulfur dioxide in the waste gas rises to the upper layer of the inner shell 1, it enters the outer shell 2 and reacts with the sodium hydroxide in the outer shell 2. Since the chemical reaction between sulfur dioxide and sodium hydroxide is an exothermic reaction, the outer shell 2 arranged outside the inner shell 1 can also play a role in keeping the clear water in the inner shell 1 warm, reducing the heat dissipation of the inner shell 1, and further improving the heat recovery efficiency.

[0036] By arranging the inner shell 1 and the outer shell 2, injecting clear water into the inner shell 1, and inserting the ventilation pipe 12 below the liquid level of the clear water, the waste gas discharged into the inner shell 1 will first contact the clear water at the bottom of the inner shell 1. At this time, part of the dust in the waste gas is removed by the clear water, and at the same time, the heat of the waste gas is also initially absorbed. There is a spray tray 11 above the liquid level of the clear water. There is a spray area between the spray tray 11 and the liquid level of the clear water. When the waste gas rises from the clear water to the spray area, the dust in the waste gas comes into full contact with the misty water, the dust is fully removed, and the heat of the waste gas will also be fully absorbed. Compared with the traditional heat recovery method, the heat recovery efficiency of the present invention is higher. At the same time, the sodium hydroxide stored in the outer shell 2 arranged around the inner shell 1 can react with carbon dioxide and release heat during the reaction. In this way, the outer shell 2 can provide heat preservation for the inner shell 1, reduce the heat dissipation of the inner shell 1, and further improve the heat recovery efficiency in the inner shell 1.

[0037] Refer to Figure 4 : An injection pipe 21 is connected and arranged on the outer wall of the inner shell 1. The injection pipe 21 extends into the sodium hydroxide solution. A sponge 22 is arranged in the inner shell 1. The waste gas passing through the spray area first passes through the sponge 22 and then through the injection pipe 21.

[0038] When the waste gas passes through the spraying area, the dust in the waste gas will be adsorbed by the atomized water. However, this will cause the humidity in the waste gas to rise. And after the waste gas passes through the spraying area, there must still be a small amount of dust in the waste gas. Thus, when the waste gas is directly injected into the sodium hydroxide solution through the injection pipe 21, the moisture in the waste gas reduces the concentration of the sodium hydroxide solution, and the residual dust in the waste gas will also contaminate the sodium hydroxide solution, resulting in a decrease in the reaction efficiency of the sodium hydroxide solution. After the sponge 22 is provided, the waste gas must pass through the sponge 22 for filtration before entering the injection pipe 21. The sponge 22 can not only intercept the dust but also adsorb the moisture in the waste gas. Moreover, the sponge 22 still has the above two functions after long-term use. This is because the water vapor in the waste gas is mainly obtained from the spraying area, and the atomized water vapor is adsorbed by the sponge 22 when passing through the sponge 22. The atomized water vapor can moisten the sponge 22 but cannot pass through the sponge 22. And at this time, the heat of the waste gas has been absorbed, and the waste gas cannot heat the sponge 22, causing the moisture in the sponge 22 to evaporate into water vapor and enter the injection pipe 21 together with the waste gas. It should be noted that the sodium hydroxide solution in the outer shell 2 needs to be replaced regularly, and the specific replacement cycle needs to be determined according to the actual situation.

[0039] Refer to Figure 4 and Figure 6 : A sewage discharge shell 13 is horizontally arranged at the bottom of the inner shell 1. An inlet 131 and an outlet 132 are respectively arranged above and below the sewage discharge shell 13. The sewage discharge shell 13 is communicated with the inner shell 1 through the inlet 131. A receiving bin 14 is horizontally movably arranged in the sewage discharge shell 13. When the receiving bin 14 moves, it can be communicated with the inlet 131 or the outlet 132.

[0040] When the receiving bin 14 moves to the end of the sewage discharge shell 13 where the inlet 131 is arranged, the receiving bin 14 is communicated with the inlet 131 at this time, and the receiving bin 14 is disconnected from the outlet 132. The receiving bin 14 moves from the inlet 131 to the direction of the outlet 132 according to the rated time. When the receiving bin 14 is below the inlet 131, the dust mixed in the clear water of the inner shell 1 falls into the receiving bin 14 through the inlet 131. The dust gradually precipitates in the receiving bin 14. When the receiving bin 14 is below the inlet 131 and reaches the rated time, the receiving bin 14 moves towards the outlet 132. The receiving bin 14 drives the precipitated dust and part of the clear water to move to the outlet 132, so that the filtered dust is discharged from the outlet 132. The receiving bin 14 can be driven by a hydraulic drive type, an electric drive type, a rope traction type or other drive methods, and the specific drive method needs to be selected according to the actual situation.

[0041] Refer to Figure 6 : A filter screen 141 is arranged at the lower part of the sewage discharge shell 13. The filter screen 141 is located between the inlet 131 and the outlet 132.

[0042] Since the dust precipitate in the receiving bin 14 contains some clear water, the filter screen 141 provided between the inlet 131 and the outlet 132 can ensure that when the receiving bin 14 passes through the filter screen 141, the clear water in the receiving bin 14 passes through the filter screen 141, while the dust continues to move towards the outlet 132 with the receiving bin 14, avoiding a large amount of clear water being discharged from the outlet 132.

[0043] Refer to Figure 3 and Figure 4 : An annular partition plate 15 is fixedly arranged along the axis of the inner shell 1 in the inner shell 1. The partition plate 15 divides the inner shell 1 into a dust collection chamber 151 and a cleaning chamber 152 from the inside to the outside. The dust mixed with clear water is located in the dust collection chamber 151, and filter holes are evenly formed in the partition plate 15.

[0044] Since the clear water in the inner shell 1 needs to be pumped out for use after being heated by the waste gas, and the clear water in the inner shell 1 is in direct contact with the waste gas when absorbing heat from the waste gas, resulting in a large amount of dust being mixed into the clear water. Thus, if the clear water mixed with dust is directly pumped out for use, it will cause the pipeline for pumping water to be blocked, and the clear water mixed with dust will greatly affect the scope of reuse. Therefore, by arranging the partition plate 15, the inner shell 1 is divided into a dust collection chamber 151 and a cleaning chamber 152. The dust sucked out from the waste gas is located in the dust collection chamber 151, and the cleaning chamber 152 does not contain dust. When the water in the inner shell 1 needs to be pumped out, the water is pumped out from the cleaning chamber 152, ensuring that the pumped-out water does not contain dust.

[0045] Refer to Figure 5 、 Figure 7 and Figure 8 : A driving unit 122 for driving the ventilation pipe 12 to rotate around its own axis is arranged at the upper part of the ventilation pipe 12. A scraping rod 121 that is slidably engaged with the inner ring side wall of the partition plate 15 is fixedly arranged on the side wall of the ventilation pipe 12 in the radial direction of the inner shell 1. The scraping rod 121 rotates synchronously with the ventilation pipe 12.

[0046] Since the partition plate 15 is provided with filter holes, there will be a situation where the dust mixed into the clear water adheres to the side wall of the partition plate 15. At the same time, some dust will also block the filter holes. By driving the ventilation pipe 12 to rotate through the driving unit 122, the scraping rod 121 arranged on the ventilation pipe 12 scrapes the dust adhering to the inner ring side wall of the partition plate 15, realizing the self-cleaning function of the partition plate 15. The driving unit 122 includes a toothed ring 1221, a gear 1222, and a rotary driver 1223. The toothed ring 1221 is fixedly arranged at the upper end of the ventilation pipe 12. A gear 1222 is engaged on one side of the toothed ring 1221. A rotary driver 1223 for driving the gear 1222 to rotate is arranged at the upper end of the gear 1222. The rotary driver 1223 is preferably a servo motor.

[0047] Reference Figure 5 and Figure 9 : A one-way valve 17 is fixedly arranged above the inner shell 1. A first corrugated pipe 16 is vertically arranged between the one-way valve 17 and the ventilation pipe 12. Two ends of the first corrugated pipe 16 are respectively connected with the one-way valve 17 and the ventilation pipe 12, and the lower end of the first corrugated pipe 16 is rotationally matched with the ventilation pipe 12. The one-way valve 17 allows waste gas to flow into the first corrugated pipe 16, and the ventilation pipe 12 intermittently moves up and down in the vertical direction.

[0048] Since the one-way valve 17 is fixedly arranged on the upper part of the inner shell 1, the height of the one-way valve 17 remains unchanged all the time. When the waste gas enters the inner shell 1, it successively passes through the one-way valve 17, the first corrugated pipe 16 and the ventilation pipe 12 from top to bottom. The lower end of the ventilation pipe 12 is of a radial structure, so that the discharged waste gas can contact the clear water more evenly. Some dust in the waste gas will adhere to the inner wall of the ventilation pipe 12 when passing through the ventilation pipe 12. After long-term use, the flow rate of the ventilation pipe 12 will decrease. In order to enable the ventilation pipe 12 to clean itself regularly, the ventilation pipe 12 intermittently moves up and down in the vertical direction. When self-cleaning is carried out, the injection of waste gas into the inner shell 1 stops. The ventilation pipe 12 first rises in the vertical direction. At this time, the waste gas in the first corrugated pipe 16 is squeezed out. After the ventilation pipe 12 rises to the highest position, the ventilation pipe 12 descends, and the first corrugated pipe 16 stretches and restores. A negative pressure is generated during the restoration process of the first corrugated pipe 16, so that the clear water in the inner shell 1 is pumped into the ventilation pipe 12. The clear water can soak and soften the dust adhering to the inner part of the ventilation pipe 12. Then, waste gas is re-introduced, so that the softened dust is discharged from the ventilation pipe 12 together with the clear water. It should be noted that the volume difference during the expansion and contraction of the first corrugated pipe 16 is smaller than the internal volume of the injection pipe 21, avoiding the accidental inhalation of the sodium hydroxide solution into the inner shell 1.

[0049] Reference Figure 4 and Figure 9 : A lifting unit 18 for driving the ventilation pipe 12 to move in the vertical direction is arranged above the ventilation pipe 12. The lifting unit 18 includes a winder 182 arranged on the upper part of the inner shell 1. A towing rope 181 is wound in the winder 182. A lifting plate 183 capable of driving the ventilation pipe 12 to rise and fall synchronously is fixedly arranged at the end of the towing rope 181. The ventilation pipe 12 is rotationally matched with the lifting plate 183.

[0050] A driving unit 122 is arranged on the lifting plate 183. When the winder 182 winds up the towing rope 181, the lifting plate 183 drives the driving unit 122 and the ventilation pipe 12 to rise synchronously. When the winder 182 releases the towing rope 181, the driving unit 122 and the ventilation pipe 12 descend synchronously.

[0051] Reference Figure 7: A second bellows 19 is vertically arranged between the lifting plate 183 and the top of the inner shell 1. The two ends of the second bellows 19 are respectively fixedly connected to the lifting plate 183 and the top of the inner shell 1. The lifting plate 183 is of a circular structure, and the diameter of the second bellows 19 is the same as that of the lifting plate 183.

[0052] The second bellows 19 can prevent the waste gas in the inner shell 1 from overflowing between the lifting plate 183 and the upper part of the inner shell 1.

[0053] Refer to Figure 7 and Figure 10 : A collection box 142 for collecting clear water is arranged below the filter screen 141. A return pipe 144 is connected between the collection box 142 and the bottom of the inner shell 1, and a water pump 143 is arranged on the return pipe 144.

[0054] By arranging the collection box 142, the clear water filtered out by the filter screen 141 can be collected by the collection box 142, and then the water pump 143 pumps the water in the collection box 142 back into the inner shell 1 through the return pipe 144.

[0055] Working principle: When treating waste gas, first, the ventilation pipe 12 introduces the waste gas into the inner shell 1. At the same time, the spray disc 11 is started. There is a gap in the vertical direction between the lower end surface of the spray disc 11 and the liquid level of the clear water in the inner shell 1, and the gap forms a spray area. When the waste gas is injected into the clear water in the inner shell 1, part of the dust in the waste gas is adsorbed by the clear water, and the other part rises along the vertical direction with sulfur dioxide. When the sulfur dioxide drives the dust not adsorbed by the clear water to rise above the clear water liquid level, it enters the spray area. Since the water sprayed by the spray disc 11 is in a mist state, the dust rising with sulfur dioxide will be fully adsorbed when passing through the spray area. After the dust is mixed with the misty water, it falls into the lower part of the inner shell 1. During the process of filtering the dust, the heat of the waste gas is also fully recovered. When the waste gas just enters the clear water in the inner shell 1, the heat of the waste gas is initially absorbed by the clear water in the inner shell 1. Then, when the waste gas rises and enters the spray area, in addition to removing dust from the waste gas, the misty water can also be in full contact with the waste gas. Compared with the traditional method of recovering the heat of waste gas, directly contacting the water in a mist state with the waste gas greatly improves the absorption efficiency of the heat in the waste gas. When the waste gas passes through the spray area, at this time, the dust in the waste gas has been filtered. When the sulfur dioxide in the waste gas rises to the upper layer of the inner shell 1, it enters the outer shell 2 and reacts with the sodium hydroxide in the outer shell 2. Since the chemical reaction between sulfur dioxide and sodium hydroxide is an exothermic reaction, the outer shell 2 arranged outside the inner shell 1 can also play a role in keeping the clear water in the inner shell 1 warm, reducing the heat dissipation of the inner shell 1, and further improving the heat energy recovery efficiency.

[0056] The above embodiments merely represent one or several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. A waste gas purification device for green desulfurized gypsum block production, comprising an inner shell (1) containing clean water; It is characterized in that A spray plate (11) is arranged inside the inner shell (1). The spray plate (11) takes water from the inner shell (1) and sprays the water in the form of mist. A spray area exists between the spray plate (11) and the clean water surface in the vertical direction. A vent pipe (12) is vertically arranged in the inner shell (1) to discharge waste gas into the inner shell (1). The lower end of the vent pipe (12) extends below the clean water surface in the inner shell (1). An outer shell (2) is arranged around the outer shell (1) and is in communication with the inner shell (1). A sodium hydroxide solution is stored in the outer shell (2). The waste gas is first injected into the clean water in the inner shell (1), then discharged into the outer shell (2) through the spray area, and finally reacts with the sodium hydroxide solution and is discharged.

2. The waste gas purification equipment for producing green desulfurized gypsum blocks according to claim 1 is characterized in that: An injection pipe (21) is arranged on the outer wall of the inner shell (1) and extends into the sodium hydroxide solution. A sponge (22) is arranged in the inner shell (1). The exhaust gas after passing through the spraying area first passes through the sponge (22) and then passes through the injection pipe (21).

3. The waste gas purification equipment for producing green desulfurized gypsum blocks according to claim 1 is characterized in that: A sewage shell (13) is horizontally arranged at the bottom of the inner shell (1), and an inlet (131) and a discharge outlet (132) are respectively arranged above and below the sewage shell (13). The sewage shell (13) is connected to the inner shell (1) through the inlet (131), and a receiving bin (14) is horizontally movably arranged in the sewage shell (13). The receiving bin (14) can be connected to the inlet (131) or the discharge outlet (132) when moving.

4. The waste gas purification equipment for producing green desulfurized gypsum blocks according to claim 3 is characterized in that: A filter screen (141) is provided at the lower part of the sewage discharge housing (13), and the filter screen (141) is located between the inlet (131) and the outlet (132).

5. The waste gas purification equipment for producing green desulfurized gypsum blocks according to claim 1 is characterized in that: An annular partition plate (15) is fixedly arranged in the inner shell (1) along the axis of the inner shell (1), and the partition plate (15) divides the inner shell (1) into a dust collecting chamber (151) and a cleaning chamber (152) from the inside to the outside. Dust mixed with clean water is located in the dust collecting chamber (151), and filter holes are evenly opened on the partition plate (15).

6. The waste gas purification equipment for producing green desulfurized gypsum blocks according to claim 1 is characterized in that: A driving unit (122) for driving the ventilation pipe (12) to rotate around its own axis is arranged at the upper part of the ventilation pipe (12), and a scraping rod (121) is fixedly arranged on the side wall of the ventilation pipe (12) along the radial direction of the inner shell (1) and is slidably matched with the inner ring side wall of the partition plate (15), and the scraping rod (121) rotates synchronously with the ventilation pipe (12).

7. The waste gas purification equipment for producing green desulfurized gypsum blocks according to claim 1 is characterized in that: A one-way valve (17) is fixedly arranged above the inner shell (1), and a first bellows (16) is vertically arranged between the one-way valve (17) and the vent pipe (12). The two ends of the first bellows (16) are respectively connected to the one-way valve (17) and the vent pipe (12), and the lower end of the first bellows (16) is rotatably matched with the vent pipe (12). The one-way valve (17) allows exhaust gas to flow into the first bellows (16), and the vent pipe (12) intermittently rises and falls in the vertical direction.

8. The waste gas purification equipment for producing green desulfurized gypsum blocks according to claim 1 is characterized in that: A lifting unit (18) is arranged above the ventilation pipe (12) for driving the ventilation pipe (12) to move in a vertical direction. The lifting unit (18) comprises a winding machine (182) arranged on the upper part of the inner shell (1). A traction rope (181) is wound in the winding machine (182). A lifting plate (183) capable of driving the ventilation pipe (12) to rise and fall synchronously is fixedly arranged on the end of the traction rope (181). The ventilation pipe (12) and the lifting plate (183) are rotatably matched.

9. The waste gas purification equipment for producing green desulfurized gypsum blocks according to claim 8 is characterized in that: A second bellows (19) is vertically arranged between the lifting plate (183) and the top of the inner shell (1), and two ends of the second bellows (19) are respectively fixedly connected to the lifting plate (183) and the top of the inner shell (1), the lifting plate (183) is a circular structure, and the diameter of the second bellows (19) is the same as the diameter of the lifting plate (183).

10. The waste gas purification equipment for green desulfurization gypsum block production according to claim 4, characterized in that: A collection box (142) for collecting clean water is provided below the filter screen (141), a return pipe (144) is connected between the collection box (142) and the bottom of the inner shell (1), and a water pump (143) is provided on the return pipe (144).

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