Desulfurizing tower

Abstract

The utility model relates to a desulfurizing tower which comprises a tower body, a filler layer, a spray header and a demister which are sequentially distributed in the tower body, a liquid outlet and an exhaust port are respectively arranged at the bottom and the top of the tower body, and a liquid injection port and an air inlet are arranged on the side wall of the tower body; the input end of the infusion pump is communicated with the bottom of the inner cavity of the tower body, and the output end is communicated with the spray header; a flow guide cavity is defined by the flow guide frame and the tower body, a downward air guide pipe is arranged on the bottom face, the flow guide cavity is communicated between the air inlet and a pipe cavity of the air guide pipe, and an air distribution channel is further arranged on the flow guide frame and communicated with an inner cavity of the tower body. According to the desulfurization tower, waste gas entering the tower body is guided by the flow guide frame to flow downwards and then flow upwards, so that the flow path length of the waste gas can be prolonged and the contact time of the waste gas and a desulfurization agent can be prolonged on the premise of not changing the height of the tower body and increasing the length of the tower body, thereby increasing the reaction amount of sulfur dioxide, improving the reaction efficiency and improving the purification effect; and the treatment cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of desulfurization, in particular to a desulfurization tower. Background Art

[0002] Desulfurization tower is a tower-type equipment for desulfurization of industrial waste gas. Its main purpose is to purify harmful gases generated in industrial production activities, especially sulfur dioxide. With the development of industrial production, desulfurization tower has become an important equipment for industrial clean production and has played a key role in environmental protection.

[0003] When the desulfurization tower in the prior art is in operation, after the sulfur dioxide waste gas enters the tower body from the air inlet, it flows directly upward and comes into contact with the packing layer and the desulfurizer sprayed downward by the nozzle. The contact time between the waste gas and the desulfurizer is short, resulting in a low amount of sulfur dioxide reaction. It is usually necessary to increase the height of the desulfurization tower or to pass the purified waste gas into the tower body for purification treatment, which increases the treatment cost and reduces the treatment efficiency. Moreover, the waste gas is unevenly distributed in the tower body, so that the reaction between the waste gas and the desulfurizer varies with the change of position, resulting in the waste gas in some positions not being fully purified, so that the waste gas treatment effect still needs to be improved.

[0004] Therefore, it is necessary to improve the desulfurization tower in the prior art. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the technical problems of high processing cost and low processing efficiency in the prior art.

[0006] In order to solve the above technical problems, the utility model provides a desulfurization tower, which is characterized by comprising:

[0007] A tower body, wherein a packing layer, a spray head and a demister are arranged in sequence from bottom to top in the tower body, a liquid discharge port and an air discharge port are respectively arranged at the bottom and top of the tower body, the liquid discharge port is connected to a liquid discharge valve, a liquid injection port and an air inlet are arranged on the side wall of the tower body, the air inlet is located below the packing layer, and the liquid injection port is detachably connected to a sealing plug;

[0008] An infusion pump, wherein the input end of the infusion pump is connected to the bottom of the inner cavity of the tower body, and the output end of the infusion pump is connected to the sprinkler head;

[0009] A flow guide frame, wherein the flow guide frame is arranged in the tower body and is located below the packing layer, the flow guide frame and the tower body are combined to form a flow guide cavity, the bottom surface of the flow guide frame is provided with an air guide pipe extending downward, the flow guide cavity is connected between the air inlet and the tube cavity of the air guide pipe, and the flow guide frame is also provided with an air distribution channel, the two ends of the air distribution channel respectively extend to the top surface and the bottom surface of the flow guide frame and are connected with the inner cavity of the tower body.

[0010] Preferably, in order to allow the exhaust gas to fully react with the desulfurizer, the air guide pipe and / or the air distribution channel are densely distributed on the guide frame.

[0011] Preferably, in order to increase the uniformity of exhaust gas distribution and ensure uniform distribution of the reaction between exhaust gas and desulfurizer, the air guide pipe and / or the air distribution channel are evenly distributed on the guide frame.

[0012] Preferably, in order to extend the length of the air guide pipe, thereby increasing the contact time between the exhaust gas and the desulfurizer, increasing the reaction volume, and improving the purification efficiency, the bottom of the air guide pipe is gap-matched with the inner bottom wall of the tower body.

[0013] Preferably, in order to increase the contact area between the exhaust gas and the desulfurizer and further improve the exhaust gas purification effect, a guide port is provided at the bottom of the air guide pipe, and the guide port is distributed along the circumference of the air guide pipe.

[0014] Preferably, in order to guide the flow of exhaust gas so that the exhaust gas flows evenly in the tower body and flows downward and then upward, the flow path is extended and the contact time with the desulfurizer is increased, thereby increasing the reaction amount, improving the purification efficiency and reducing the exhaust gas treatment cost, the guide frame includes an upper baffle and a lower baffle which are respectively arranged above and below the air inlet side and fixedly connected to the circumferential inner wall of the tower body, the upper baffle and the lower baffle are fixedly connected through an air distribution pipe, and upper air distribution holes and lower air outlet holes which are connected to the top and bottom ends of the air distribution pipe are respectively provided on the upper baffle and the lower baffle, the lower air outlet hole, the tube cavity of the air distribution pipe and the upper air distribution hole are connected in sequence to form the air distribution channel, and the lower baffle is also provided with air guide holes which are connected to the air guide pipe in a one-to-one correspondence.

[0015] Preferably, in order to further promote the contact reaction between the exhaust gas and the desulfurizer, a sponge layer is further provided in the tower body, the sponge layer is located below the liquid injection port and the circumferential outer edge is connected to the circumferential inner wall of the tower body, and the air duct passes through the sponge layer.

[0016] Preferably, in order to prevent particulate matter from being sucked into the infusion pump, causing blockage of the spray head and the packing layer and affecting the exhaust gas desulfurization reaction, a filter is connected to the input end of the infusion pump.

[0017] Preferably, in order to facilitate discharge and simplify the equipment structure, and to facilitate the infusion pump to extract the desulfurizer that falls from the top to the bottom of the tower body, the discharge port is connected to a discharge pipe, and the discharge pipe includes a discharge section extending downward, and a filter port is provided on the circumferential side wall of the discharge section, and the filter screen is provided in the filter port.

[0018] Preferably, in order to facilitate the detection of the pH value at the bottom of the tower body to determine the remaining amount of the desulfurizer, the tower body is also connected to a pH detector, which includes a pH sensor arranged at the bottom of the tower body and an instrument arranged outside the tower body and electrically connected to the pH sensor.

[0019] Compared with the prior art, the desulfurization tower of the utility model guides the exhaust gas entering the tower body through the guide frame to flow downward first and then upward. Without changing the height of the tower body or increasing the length of the tower body, the flow path length of the exhaust gas can be extended, and the contact time with the desulfurizer can be increased to increase the reaction amount of sulfur dioxide, improve the reaction efficiency, improve the purification effect, and save treatment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein:

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of;

[0023] Figure 3 yes Figure 2 A magnified view of part A;

[0024] Figure 4 yes Figure 1 Explosion diagram of

[0025] Figure 5 yes Figure 4 Schematic diagram of some structures;

[0026] Figure 6 yes Figure 5 Explosion diagram of

[0027] Figure 7 It is a structural schematic diagram of the tower bottom of the utility model;

[0028] Explanation of the reference numerals in the specification: 1. tower body; 11. tower bottom; 111. drain port; 112. drain valve; 113. injection port; 114. air inlet; 115. sealing plug; 116. support leg; 12. tower body; 121. exhaust port; 122. bolts; 123. nuts; 13. packing layer; 14. spray head; 141. spray pipe; 15. demister; 16. sponge layer; 17. filter; 18. drain pipe; 2. infusion pump; 3. guide frame; 31. air guide pipe; 311. guide port; 32. upper partition; 321. upper air distribution hole; 33. lower partition; 331. lower air outlet; 332. air guide hole; 34. air distribution pipe; 4. pH detector; 41. pH sensor; 42. instrument. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0030] It should be noted that when an element is referred to as being "disposed on" or "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is referred to as being "fixed on" another element, or "fixedly connected" to another element, they may be fixed in a detachable manner or in a non-detachable manner. When an element is considered to be "connected" or "rotatably connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used are for illustrative purposes only and do not represent the only implementation method.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to restrict the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] The terms “first”, “second”, “third” and the like in the present invention do not represent specific quantities and sequences, but are merely used to distinguish names.

[0033] Reference Figure 1-Figure 7 As shown, the desulfurization tower of the utility model comprises:

[0034] A tower body 1, in which a packing layer 13, a spray head 14 and a demister 15 are sequentially arranged from bottom to top, a liquid discharge port 111 and an exhaust port 121 are respectively arranged at the bottom and the top of the tower body 1, the liquid discharge port 111 is connected to a liquid discharge valve 112, a liquid injection port 113 and an air inlet 114 are arranged on the side wall of the tower body 1, the air inlet 114 is located below the packing layer 13, and the liquid injection port 113 is detachably connected to a sealing plug 115;

[0035] An infusion pump 2, the input end of the infusion pump 2 is connected to the bottom of the inner cavity of the tower body 1, and the output end of the infusion pump 2 is connected to the spray head 14;

[0036] The guide frame 3 is arranged in the tower body 1 and is located below the packing layer 13. The guide frame 3 and the tower body 1 enclose a guide cavity. The bottom surface of the guide frame 3 is provided with an air guide pipe 31 extending downward. The guide cavity is connected between the air inlet 114 and the tube cavity of the air guide pipe 31. The guide frame 3 is also provided with an air distribution channel. The two ends of the air distribution channel extend to the top and bottom surfaces of the guide frame 3 respectively and are connected with the inner cavity of the tower body 1.

[0037] Specifically, the tower body 1 includes a tower bottom 11 and a tower body 12 which are arranged in sequence from bottom to top. The top surface of the tower bottom 11 is provided with an upper flange on the circumferential outer edge, and the bottom surface of the tower body 12 is provided with a lower flange on the circumferential outer edge. The upper flange and the lower flange are fixedly connected by threaded bolts 122 and nuts 123, thereby fixing the tower bottom 11 and the tower body 12 together. A support leg 116 is fixed below the tower bottom 11 to support the tower body 1.

[0038] The injection port 113 and the air inlet 114 are both arranged above the circumferential side wall of the tower bottom 11, the discharge port 111 is arranged at the bottom of the tower bottom 11 and is connected with a discharge pipe 18, and the discharge valve 112 is arranged on the discharge pipe 18, wherein the injection port 113 is also connected with an upward injection pipe, and the end of the injection pipe away from the tower bottom 11 is threadedly connected with a sealing plug 115, and the desulfurizer and water are conveniently injected into the tower bottom 11 through the injection pipe 113 and the injection port. It should be noted that the commonly used desulfurizer is mainly a calcium-based desulfurizer, such as lime, slaked lime, carbide slag, limestone and dolomite, etc., and can also be taken from calcium-rich industrial waste residues and raw materials. These desulfurizers are widely available, raw materials are easy to obtain, and the desulfurization efficiency is high. In particular, the limestone desulfurizer, which is one of the most commonly used desulfurizers, is mainly composed of limestone, produces calcium oxide by high-temperature decomposition, and then reacts with sulfur dioxide in the flue gas to generate calcium sulfate. The desulfurizer forms a calcium hydroxide solution at the bottom of the tower bottom 11; the air inlet 114 is used to introduce industrial waste gas containing sulfur dioxide. After the desulfurization is completed, the drain valve 112 can be opened to allow the calcium hydroxide solution and part of the particle sediment to be discharged through the drain pipe 18, and then the drain valve 112 is closed, the sealing plug 115 is opened, and the desulfurizer and water are added to the tower bottom 11 through the injection port 113 and the injection pipe to form a calcium hydroxide solution.

[0039] The exhaust port 121 is arranged at the top of the tower body 12, and the packing layer 13, the spray head 14 and the demister 15 are sequentially distributed in the tower body 12 from bottom to top; the spray head 14 is downward and the top is connected with a spray pipe 141, and the infusion pump 2 is located outside the tower body 1, and its input end is connected with the bottom of the inner cavity of the tower bottom 11, and the output end is connected with the spray pipe 141. Among them, the packing layer 13 is made of porous materials such as ceramic balls or plastic fillers. Its function is to increase the contact area between the flue gas and the desulfurizer and improve the desulfurization efficiency; the spray head 14 is used to spray the desulfurizer (such as limestone slurry, calcium hydroxide solution, etc.) evenly and low into the incoming sulfur dioxide waste gas, and the spray pipe 141 is used to fix the spray head 14 to ensure that it is in the correct position and angle to achieve the best spraying effect; the demister 15 is used to remove droplets in the exhaust gas to prevent the desulfurizer from being discharged with the flue gas, thereby reducing the impact on the environment; the infusion pump 2 is used to extract the desulfurizer at the bottom of the tower 11 and transport it to the spray head 14, so that the desulfurizer is sprayed downward to contact with sulfur dioxide, and finally falls into the tower bottom 11 to form a circulating flow.

[0040] Different from the prior art, the utility model is further provided with a guide frame 3 in the tower bottom 11, and the guide frame 3 and the circumferential inner wall of the tower bottom 11 enclose a guide cavity and have a gas distribution channel. After the exhaust gas passes through the air inlet 114, it first enters the guide cavity, and then flows downward through the air guide pipe 31. After flowing downward from the bottom of the air guide pipe 31, the exhaust gas flows upward, flows upward through the gas distribution channel, and then passes through the packing layer 13, the spray head 14 and the demister 15 in sequence. That is, the exhaust gas first flows downward, and then flows upward, so that the flow path length of the exhaust gas is increased, thereby extending the contact time between the exhaust gas and the desulfurizer, increasing the amount of sulfur dioxide reaction in the exhaust gas, and improving the exhaust gas purification efficiency and purification amount without increasing the length of the tower body 1 and the number of tower bodies 1, and reducing the processing cost.

[0041] A further improvement is that the air guide pipes 31 and / or air distribution channels are densely distributed on the guide frame 3. Specifically, the air guide pipes 31 are densely distributed on the guide frame 3, so that the exhaust gas passes through the densely distributed air guide pipes 31 downward and is densely distributed in the lower part of the inner cavity of the tower bottom 11, ensuring full contact with the desulfurizer in the lower part of the inner cavity of the tower bottom 11, increasing the reaction amount and improving the reaction efficiency; and the air distribution channels are densely distributed on the guide frame 3, so that the exhaust gas passing through the air distribution channels can fully contact with the desulfurizer above the guide frame 3 to increase the reaction amount.

[0042] A further improvement is that the air guide pipe 31 and / or the air distribution channel are evenly distributed on the guide frame 3. Specifically, the air guide pipe 31 and the air distribution channel are evenly distributed on the guide frame 3, so that the exhaust gas can be evenly distributed in the tower body 1 and evenly contact the desulfurizer in the tower body 1, reducing the difference in the degree of reaction at each location, so as to improve the exhaust gas purification effect.

[0043] A further improvement is that the bottom of the air duct 31 is gap-matched with the inner bottom wall of the tower body 1. Specifically, the bottom of the air duct 31 is fixedly connected to the inner bottom wall of the tower body 1, and the bottom of the air duct 31 is provided with a guide port 311, which is distributed along the circumference of the air duct 31.

[0044] The bottom of the air guide pipe 31 is fixedly connected to the inner bottom wall of the tower bottom 11, so that the length of the air guide pipe 31 is extended, thereby extending the length of the path for the exhaust gas to flow downward, further increasing the contact reaction amount between the exhaust gas and the desulfurizer, and improving the reaction effect; and a plurality of guide ports 311 distributed in a circular array are arranged at the bottom position of the air guide pipe 31, so that after the exhaust gas flows out through the guide ports 311, a plurality of tiny bubbles are formed, thereby increasing the contact area between the exhaust gas and the desulfurizer at the bottom of the tower bottom 11, thereby further increasing the reaction amount, improving the reaction efficiency and improving the purification effect.

[0045] A further improvement is that the guide frame 3 includes an upper partition 32 and a lower partition 33 which are respectively arranged above and below the side of the air inlet 114 and fixedly connected to the circumferential inner wall of the tower body 1. The upper partition 32 and the lower partition 33 are fixedly connected through an air distribution pipe 34. The upper partition 32 and the lower partition 33 are respectively provided with upper air distribution holes 321 and lower air outlet holes 331 which are connected to the top and bottom ends of the air distribution pipe 34. The lower air outlet holes 331, the tube cavity of the air distribution pipe 34 and the upper air distribution holes 321 are connected in sequence to form an air distribution channel. The lower partition 33 is also provided with air guide holes 332 which are connected to the air guide pipes 31 one by one.

[0046] The specific structure of the guide frame 3 can be referred to Figure 2 , Figure 3 and Figure 6 As shown, a guide cavity is formed by combining the bottom surface of the upper partition 32, the top surface of the lower partition 33, the circumferential outer wall of the air distribution pipe 34 and the circumferential inner wall of the tower bottom 11; the air guide hole 332 of the lower partition 33 is connected between the guide cavity and the air guide pipe 31, so that after the exhaust gas enters the guide cavity, it flows downward along the air guide hole 332 and the air guide pipe 31 in turn, and then flows upward after emerging from the guide port 311, and the exhaust gas is formed by the air distribution channel formed by the lower air outlet hole 331, the tube cavity of the air distribution pipe 34 and the upper air distribution hole 321 connected in turn, thereby ensuring a sufficient and uniform reaction between the exhaust gas and the desulfurizer.

[0047] A further improvement is that a sponge layer 16 is further provided in the tower body 1 . The sponge layer 16 is located below the liquid injection port 113 and its circumferential outer edge is connected to the circumferential inner wall of the tower body 1 . The air guide pipe 31 passes through the sponge layer 16 .

[0048] The sponge layer 16 is a porous structure, and the sponge layer 16 is immersed in the solution formed by the desulfurizer. The sponge layer 16 is located above the guide port 311, so that the sponge layer 16 can further increase the contact reaction time between the small bubbles of exhaust gas in the desulfurizer solution and the desulfurizer, thereby promoting sufficient reaction and ensuring the purification effect of the exhaust gas.

[0049] A further improvement is that the input end of the infusion pump 2 is connected with a filter 17; in order to simplify the structure, the discharge pipe 18 includes a discharge section extending downward, a filter port is provided on the circumferential side wall of the discharge section, and the filter 17 is provided in the filter port. The filter 17 can filter out particulate impurities in the reaction solution to prevent the infusion pump 2 from being transported to the spray head 14, causing blockage of the spray head 14 and the packing layer 13, and affecting the desulfurization of the exhaust gas.

[0050] A further improvement is that the tower body 1 is further connected to a PH detector 4 , which includes a PH sensor 41 arranged at the bottom of the tower body 1 and a meter 42 arranged outside the tower body 1 and electrically connected to the PH sensor 41 .

[0051] Specifically, the pH sensor 41 is fixed in the tower bottom 11. The pH value of the desulfurizer solution is detected by the pH sensor 41 to detect the concentration of hydroxide ions, and the concentration is displayed by the instrument 42, so as to judge the concentration of the desulfurizer in the tower bottom 11. When the concentration is lower than a predetermined value (the specific value can be adjusted and set according to the needs of the user), the sealing plug 115 is opened and the desulfurizer is added through the injection port 113 to ensure the purification effect of the sulfur dioxide waste gas.

[0052] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A desulfurization tower, characterized in that: include: A tower body (1), wherein a packing layer (13), a spray head (14) and a demister (15) are arranged in sequence from bottom to top in the tower body (1), a liquid discharge port (111) and an air discharge port (121) are respectively arranged at the bottom and top of the tower body (1), the liquid discharge port (111) is connected to a liquid discharge valve (112), a liquid injection port (113) and an air inlet (114) are arranged on a side wall of the tower body (1), the air inlet (114) is located below the packing layer (13), and the liquid injection port (113) is detachably connected to a sealing plug (115); an infusion pump (2), wherein an input end of the infusion pump (2) is connected to the bottom of the inner cavity of the tower body (1), and an output end of the infusion pump (2) is connected to the spray head (14); A flow guide frame (3), the flow guide frame (3) being arranged in the tower body (1) and below the packing layer (13), the flow guide frame (3) and the tower body (1) enclosing a flow guide cavity, the bottom surface of the flow guide frame (3) being provided with an air guide pipe (31) extending downward, the flow guide cavity being connected between the air inlet (114) and the tube cavity of the air guide pipe (31), the flow guide frame (3) being further provided with an air distribution channel, the two ends of the air distribution channel respectively extending to the top surface and the bottom surface of the flow guide frame (3) and being connected to the inner cavity of the tower body (1).

2. The desulfurization tower according to claim 1, characterized in that: The air guide pipes (31) and / or the air distribution channels are densely distributed on the air guide frame (3).

3. The desulfurization tower according to claim 1, characterized in that: The air guide pipe (31) and / or the air distribution channel are evenly distributed on the air guide frame (3).

4. The desulfurization tower according to claim 1, characterized in that: The bottom of the air guide pipe (31) is clearance-matched with the inner bottom wall of the tower body (1).

5. The desulfurization tower according to claim 4, characterized in that: The bottom of the air guide pipe (31) is provided with a flow guide port (311), and the flow guide port (311) is distributed along the circumference of the air guide pipe (31).

6. The desulfurization tower according to claim 1, characterized in that: The guide frame (3) comprises an upper baffle (32) and a lower baffle (33) which are respectively arranged above and below the air inlet (114) and fixedly connected to the circumferential inner wall of the tower body (1); the upper baffle (32) and the lower baffle (33) are fixedly connected via an air distribution pipe (34); the upper baffle (32) and the lower baffle (33) are respectively provided with an upper air distribution hole (321) and a lower air outlet hole (331) which are connected to the top and bottom ends of the air distribution pipe (34); the lower air outlet hole (331), the tube cavity of the air distribution pipe (34) and the upper air distribution hole (321) are connected in sequence to form the air distribution channel; the lower baffle (33) is also provided with an air guide hole (332) which is connected to the air guide pipe (31) in a one-to-one correspondence.

7. The desulfurization tower according to claim 1, characterized in that: A sponge layer (16) is also provided in the tower body (1), the sponge layer (16) is located below the liquid injection port (113) and the circumferential outer edge is connected to the circumferential inner wall of the tower body (1), and the air guide tube (31) passes through the sponge layer (16).

8. The desulfurization tower according to claim 1, characterized in that: The input end of the infusion pump (2) is connected to a filter screen (17).

9. The desulfurization tower according to claim 8, characterized in that: The liquid discharge port (111) is connected to a liquid discharge pipe (18), the liquid discharge pipe (18) comprises a liquid discharge section extending downward, a filter port is arranged on a circumferential side wall of the liquid discharge section, and the filter screen (17) is arranged in the filter port.

10. The desulfurization tower according to claim 1, characterized in that: The tower body (1) is also connected to a pH detector (4), which comprises a pH sensor (41) arranged at the bottom of the tower body (1) and a meter (42) arranged outside the tower body (1) and electrically connected to the pH sensor (41).

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