Novel high-temperature acid mist dust-containing tail gas treatment device

Abstract

The utility model discloses a dust-containing tail gas treatment device for high-temperature acid mist. The dust-containing tail gas treatment device comprises a dust remover, a primary spraying system, a pipeline heat exchanger, a secondary spraying system, a wire mesh demister and an exhaust funnel, after high-temperature acid mist dust-containing tail gas sequentially passes through the dust remover, the first-stage spraying system, the pipeline heat exchanger, the second-stage spraying system and the wire mesh demister, the temperature and the dust and acid mist content of the high-temperature acid mist dust-containing tail gas are greatly reduced, and the tail gas reaching the emission standard is exhausted through the exhaust funnel. Wherein the first-stage spraying system comprises a first-stage spraying tower, and the second-stage spraying system comprises a second-stage spraying tower. The multi-stage spraying system, the heat exchange system and the demisting system are arranged, so that up-to-standard emission of tail gas is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-temperature tail gas treatment, and particularly relates to a novel high-temperature acid mist and dust-containing tail gas treatment device. Background Art

[0002] In the field of new energy, most companies producing cathode materials need to use rotary kilns for roasting to obtain products that meet the requirements. This process is especially unavoidable in the production of iron phosphate precursors. Due to the high sintering temperature of rotary kilns, iron phosphate products will produce a large amount of dusty and sulfur-containing tail gas during the sintering process. These tail gases need to be treated before they can be discharged into the atmosphere. If the emissions do not meet the qualified indicators, environmental problems will arise, affecting the environment and the company's production.

[0003] In the production process of iron phosphate, the control of tail gas temperature is an important process point. If the tail gas temperature is too high, a large amount of spray water will evaporate, and the salt in the spray water will enter the tail gas system, causing the emission of dust to exceed the standard, and it may also affect the normal operation of equipment and instruments. How to set up a reasonable tail gas treatment system and device is an important issue that needs to be faced in the production of iron phosphate and positive electrode materials. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. The utility model proposes a novel high-temperature acid mist and dust-containing tail gas treatment device, comprising:

[0005] A dust collector, wherein the dust collector is provided with a dust collector air inlet and a dust collector air outlet;

[0006] A primary spray system, the primary spray system comprising a primary spray tower, the primary spray tower being provided with a primary spray tower air inlet and a primary spray tower air outlet, the primary spray tower air inlet being connected to the dust collector air outlet;

[0007] A pipeline heat exchanger, wherein the pipeline heat exchanger is provided with an air inlet of the pipeline heat exchanger and an air outlet of the pipeline heat exchanger, and the air inlet of the pipeline heat exchanger is connected to the air outlet of the first-stage spray tower;

[0008] A secondary spray system, the secondary spray system comprising a secondary spray tower, the secondary spray tower being provided with a secondary spray tower air inlet and a secondary spray tower air outlet, the secondary spray tower air inlet being connected to the air outlet of the pipeline heat exchanger;

[0009] A wire mesh demister, wherein the wire mesh demister is provided with a wire mesh demister air inlet and a wire mesh demister air outlet, and the wire mesh demister air inlet is connected to the secondary spray tower air outlet;

[0010] An exhaust pipe is connected to an air outlet of the wire mesh demister.

[0011] According to some embodiments of the utility model, the first-level spray system also includes an online filter, a first plate heat exchanger and a first power device, the online filter, the first plate heat exchanger and the first power device are arranged outside the first-level spray tower, the first-level spray tower includes a first water collecting tank and a first nozzle, the first water collecting tank is arranged at the bottom of the first-level spray tower, the first nozzle is arranged at the upper part of the first-level spray tower, the first water collecting tank stores spray alkali solution, the first water collecting tank, the online filter, the first plate heat exchanger, the first power device and the first nozzle are connected in sequence through a first spray pipe.

[0012] According to some embodiments of the utility model, the secondary spray system also includes a second plate heat exchanger and a second power device, the second plate heat exchanger and the second power device are arranged outside the secondary spray tower, the secondary spray tower includes a second water collecting tank and a second nozzle, the second water collecting tank is arranged at the bottom of the secondary spray tower, the second nozzle is arranged at the upper part of the secondary spray tower, the second water collecting tank stores the spray alkali solution, the second water collecting tank, the second power device, the second plate heat exchanger and the second nozzle are connected in sequence through a second spray pipe.

[0013] According to some embodiments of the utility model, the dust collector includes a metal filter bag, a blower, a dust collector unloading butterfly valve, a dust collector air bag, a dust collector blow pipe and a remote pressure differential gauge; the dust collector air inlet is arranged at the lower part of the dust collector, the dust collector air outlet is arranged at the upper part of the dust collector, and the metal filter bag is arranged between the dust collector air inlet and the dust collector air outlet; the blower is arranged at the bottom of the dust collector, a discharge pipe is arranged at the bottom of the blower, and the dust collector unloading butterfly valve is arranged on the discharge pipe; the dust collector air bag is arranged at the top of the dust collector, the dust collector air bag is connected to the dust collector blow pipe, and the dust collector blow pipe is installed above the metal filter bag; the remote pressure differential gauge is arranged on the outside of the dust collector.

[0014] According to some embodiments of the utility model, the air inlet of the first-level spray tower is arranged at the lower part of the first-level spray tower, the air outlet of the first-level spray tower is arranged at the top of the first-level spray tower, the first-level spray tower includes two layers of first-level spray tower fillers, and the first-level spray tower fillers are located between the air inlet of the first-level spray tower and the air outlet of the first-level spray tower; the air inlet of the second-level spray tower is arranged at the lower part of the second-level spray tower, the air outlet of the second-level spray tower is arranged at the top of the second-level spray tower, the second-level spray tower includes a swirl plate and a layer of second-level spray tower fillers, the second-level spray tower fillers are located between the air inlet of the second-level spray tower and the air outlet of the second-level spray tower, and the swirl plate is arranged below the air outlet of the second-level spray tower; the air inlet of the first-level spray tower is provided with a first-level spray tower nozzle, and the air inlet of the second-level spray tower is provided with a second-level spray tower nozzle. According to some embodiments of the utility model, the online filter includes a differential pressure gauge and an online filter drain port, the differential pressure gauge is arranged inside the online filter, the online filter drain port is arranged at the bottom of the online filter, and the online filter drain port is connected to a drain pipe to discharge waste liquid.

[0015] According to some embodiments of the utility model, the air inlet of the pipe heat exchanger and the air outlet of the pipe heat exchanger are respectively located on the left and right sides of the pipe heat exchanger; a cooling water inlet is provided on one side of the upper portion of the pipe heat exchanger, and a cooling water outlet is provided on the side of the lower portion of the pipe heat exchanger away from the cooling water inlet; a spray pipe inlet is provided on the other side of the upper portion of the pipe heat exchanger, a pipe heat exchanger nozzle is provided on the inner top end of the pipe heat exchanger, the pipe heat exchanger nozzle is connected to the spray pipe inlet, and a pipe heat exchanger sewage outlet is provided on the other side of the lower portion of the pipe heat exchanger; the cooling water inlet and the cooling water outlet are connected through a cooling water pipe.

[0016] According to some embodiments of the utility model, the first-level spray tower air inlet is provided with a first-level spray tower air inlet duct structure, and the second-level spray tower air inlet is provided with a second-level spray tower air inlet duct structure; one end of the first-level spray tower air inlet duct structure and the second-level spray tower air inlet duct structure for outputting exhaust gas is bent downward from the horizontal direction.

[0017] According to some embodiments of the utility model, the wire mesh demister includes a wire mesh, and the wire mesh is arranged between the wire mesh demister air inlet and the wire mesh demister air outlet; a wire mesh demister water inlet is provided on one side of the upper part of the wire mesh demister, and a wire mesh demister drain outlet is provided on one side of the lower part of the wire mesh demister away from the wire mesh demister water inlet.

[0018] According to some embodiments of the present utility model, the first-stage spray tower further includes a first differential pressure level gauge and a first online pH meter, and the second-stage spray tower further includes a second differential pressure level gauge and a second online pH meter.

[0019] According to the embodiment of the utility model, a high-temperature acid mist dust-containing tail gas treatment device has at least the following technical effects: by setting up a primary spray system and a pipeline heat exchanger to cool down the high-temperature tail gas, it is prevented that the high-temperature tail gas causes the spray alkali liquid to evaporate in the secondary spray system and generate a large amount of steam, which affects the dust removal effect. At the same time, the multi-stage cooling process can also reduce the probability of equipment and instruments failing due to overheating. At the same time, a wire mesh demister is set in the front section of the exhaust pipe, which can effectively intercept the salt solution droplets entrained in the tail gas to ensure that the tail gas meets the emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is a schematic diagram of a high-temperature acid mist and dust-containing tail gas treatment device of the utility model;

[0022] Figure 2 It is a partial structural schematic diagram of the high-temperature acid mist and dust-containing tail gas treatment device of the utility model;

[0023] Figure 3 It is a structural schematic diagram of a first-level spray tower of the utility model;

[0024] Figure 4 It is a schematic diagram of the structure of the dust collector of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the pipeline heat exchanger of the utility model.

[0026] Reference numerals:

[0027] 100. Dust collector; 101. First-stage spray tower; 102. In-line filter; 103. First plate heat exchanger; 104. Pipe heat exchanger; 105. Second-stage spray tower; 106. Wire mesh demister; 107. Exhaust pipe; 108. Metal filter bag; 109. Remote differential pressure gauge; 110. Fan off; 111. Air hammer; 112. First-stage spray tower packing; 113-1. First spray pipeline; 113-2. Second spray pipeline; 114-1. First differential pressure level gauge; 114-2. Second differential pressure level gauge Liquid level meter; 115-1. First online pH meter; 115-2. Second online pH meter; 116-1. First bottom vent; 116-2. Second bottom vent; 117. Online filter drain port; 118. Cooling water inlet; 119. Pipeline heat exchanger drain port; 120. Spray pipe inlet; 121. Cooling water outlet; 122. Pipeline heat exchanger nozzle; 123. Secondary spray tower packing; 124. Cyclone plate; 125. Second plate heat exchanger; 126. Wire mesh demister water inlet; 127. Wire mesh mist eliminator drain outlet; 128. Pressure differential gauge; 129-1. First-stage spray tower nozzle; 129-2. Second-stage spray tower nozzle; 130-1. First-stage spray tower air inlet pipe structure; 130-2. Second-stage spray tower air inlet pipe structure; 131. Dust collector discharge butterfly valve; 132. Dust collector air bag; 133. Dust collector blowing pipe; 134-1. First water collecting tank; 134-2. Second water collecting tank; 135-1. First nozzle; 135-2. Second nozzle; 136. Dust collector air inlet; 1 37. Air outlet of dust collector; 138. Air inlet of primary spray tower; 139. Air outlet of primary spray tower; 140. Air inlet of pipeline heat exchanger; 141. Air outlet of pipeline heat exchanger; 142. Air inlet of secondary spray tower; 143. Air outlet of secondary spray tower; 144. Air inlet of wire mesh demister; 145. Air outlet of wire mesh demister; 146. First power unit; 147. Second power unit; 148-1, 148-2. Upper pipe wall; 149-1, 149-2. Lower pipe wall; 150. Wire mesh. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] The utility model relates to a novel high-temperature acid mist and dust-containing tail gas treatment device, such as Figure 1-5 As shown, it includes a dust collector 100, a primary spray system, a pipeline heat exchanger 104, a secondary spray system, a wire mesh demister 106 and an exhaust pipe 107. High-temperature acid mist dust-containing tail gas is introduced from the dust collector air inlet 136, and leaves from the dust collector air outlet 137 after most of the dust is removed, and then enters the primary spray system. The primary spray system includes a primary spray tower 101, and the tail gas is introduced from the primary spray tower air inlet 138 for spray treatment to reduce the temperature of the tail gas and the content of acidic substances (sulfur dioxide, sulfur trioxide, etc.). Then the tail gas leaves from the primary spray tower air outlet 139, and is introduced into the pipeline heat exchanger 104 from the pipeline heat exchanger air inlet 140 for further cooling. Then the tail gas passes through the pipeline heat exchanger air outlet 141 and enters the secondary spray system. The secondary spray system includes a secondary spray tower 105. The tail gas is introduced from the secondary spray tower air inlet 142 for spray treatment again to further reduce the temperature and the acid content. The tail gas discharged from the secondary spray tower air outlet 143 enters the wire mesh demister 106 through the wire mesh demister air inlet 144. The tail gas after the mixed droplets are removed enters the exhaust pipe 107 through the wire mesh demister air outlet 145. The tail gas that meets the emission standards is discharged to the outside through the exhaust pipe 107. The utility model can effectively reduce the temperature of the high-temperature tail gas through the setting of the multi-stage heat exchange system and the spray system, and can also remove the dust and acid mist in the tail gas, so that it can meet the emission standards.

[0033] In some specific embodiments of the present invention, Figure 2, Figure 3 As shown, the primary spray system includes a primary spray tower 101, an online filter 102, a first plate heat exchanger 103 and a first power device 146, wherein the online filter 102, the first plate heat exchanger 103 and the first power device 146 are located outside the primary spray tower 101. A first water collecting tank 134-1 is provided at the bottom of the primary spray tower 101, a first spray head 135-1 is provided at the upper part of the primary spray tower 101, and the first water collecting tank 134-1 stores spray alkali solution. The first water collecting tank 134-1, the online filter 102, the first plate heat exchanger 103, the first power device 146 and the first spray head 135-1 are sequentially connected through the first spray pipe 113-1. The first-stage spray tower 101 extracts the spray alkali solution in the first water collecting tank 134-1 through the first power device 146 (such as a circulating pump). The spray alkali solution passes through the online filter 102, the first plate heat exchanger 103 and the first power device 146 in sequence and is sprayed out by the first nozzle 135-1 to absorb the tail gas entering from the air inlet 138 of the first-stage spray tower. After absorbing the tail gas, the spray alkali solution falls into the first water collecting tank 134-1 to realize circulation. Among them, the online filter 102 is used to remove dust mixed in the spray alkali solution, and the first plate heat exchanger 103 is used to cool the spray alkali solution after absorbing the high-temperature tail gas to maintain the absorption effect of the spray alkali solution on the tail gas. The tail gas treated by the first-stage spray system basically does not contain dust, and the content and temperature of acidic substances are reduced to a certain extent. Since the dust removal efficiency of the dust collector 100 cannot reach 100%, some particulate matter is still mixed in the exhaust gas entering the primary spray system. As time goes by, the solid content of the spray alkali solution will gradually increase, increasing the load of the first power unit and causing equipment damage. The setting of the online filter 102 can maintain the solid content of the spray alkali solution at a lower value.

[0034] Furthermore, the shell of the online filter 102 is made of 304 stainless steel, which has good temperature resistance. The online filter 102 is also provided with a nozzle and a differential pressure gauge 128. The differential pressure gauge 128 measures the internal and external pressure difference of the filter element of the online filter 102. When the pressure difference reaches a certain value, backblowing is started through the nozzle to clean the attachments on the filter element, thereby achieving the purpose of recycling.

[0035] In some specific embodiments of the present invention, Figure 2As shown, the secondary spray system includes a secondary spray tower 105, a second plate heat exchanger 125 and a second power device 147. The second plate heat exchanger 125 and the second power device 147 are located outside the secondary spray tower 105. A second water collecting tank 134-2 is provided at the bottom of the secondary spray tower 105. A second nozzle 135-2 is provided at the upper part of the secondary spray tower 105. The second water collecting tank 134-2 stores spray alkali solution. The second water collecting tank 134-2, the second power device 147, the second plate heat exchanger 125 and the second nozzle 135-2 are sequentially connected through the second spray pipe 113-2. The secondary spray tower 105 extracts the spray alkali solution in the second water collecting tank 134-2 through the second power device 147 (such as a circulating pump). The spray alkali solution passes through the second power device 147 and the second plate heat exchanger 125 and is sprayed out by the second nozzle 135-2 to absorb the tail gas entering from the air inlet 142 of the secondary spray tower. After absorbing the tail gas, the spray alkali solution falls into the second water collecting tank 134-2 to realize circulation. Since the temperature of the tail gas entering the secondary spray system is still relatively high, the second plate heat exchanger 125 is used to cool the spray alkali solution after absorbing the high-temperature tail gas. The acid content and temperature of the tail gas treated by the secondary spray tower 105 further decrease and are discharged from the air outlet 143 of the secondary spray tower.

[0036] Plate heat exchangers are installed in both the primary spray system and the secondary spray system to cool the exhaust gas and avoid equipment and instrument failures caused by excessively high spray alkali solution temperatures. At the same time, as the spray tower absorbs high-temperature exhaust gas, the spray alkali solution temperature will gradually increase, and there may be a problem of large amounts of water evaporation. The setting of the plate heat exchanger can control the spray alkali solution temperature from being too high, reduce water evaporation, and prevent the spray alkali solution from entering the rear exhaust pipe after atomization, causing dust to exceed the standard.

[0037] Furthermore, the first plate heat exchanger 103 and the second plate heat exchanger 125 are both made of 304 stainless steel.

[0038] In some specific embodiments of the present invention, Figure 4As shown, the main body of the dust collector 100 is made of 316L stainless steel, and the outside is wrapped with heat-insulating cotton; a metal filter bag 108 is arranged inside the dust collector 100, located between the dust collector air inlet 136 and the dust collector air outlet 137, and is made of 304 stainless steel. The aperture of the metal filter bag 108 can be selected as needed; the metal filter bag 108 is installed on the flower plate, and a sealing ring is arranged around it. The lower part of the dust collector 100 is a conical silo, and an air hammer 111 is installed outside the conical silo to vibrate the dust collector 100 to make the material fall and prevent the dust from clogging. A dust collector air bag 132 is arranged on the top of the dust collector 100, and a dust collector blowing pipe 133 is arranged on the dust collector air bag 132 to enter the interior of the dust collector 100, which is used for regular backblowing to remove the material on the surface of the metal filter bag 108; the dust collector air bag 132 is also provided with an automatic blowing program. The bottom of the dust collector 100 is provided with a fan 110 made of 304 stainless steel. A discharge pipe is provided at the bottom of the fan 110. A dust collector discharge butterfly valve 131 is provided on the discharge pipe. The dust collector discharge butterfly valve 131 is opened crosswise to form a material seal to prevent back-blowing gas from entering the discharge pipe. The dust collector 100 is equipped with a remote pressure differential gauge 109 to judge the blockage of the metal filter bag by the pressure difference between the inside and outside of the dust collector 100. The dust collector 100 uses a metal filter element, which has greatly improved heat resistance compared to traditional bag dust collectors. Traditional bag dust collectors can withstand a temperature of 250°C, while metal filter elements can withstand a temperature of up to 450°C, which is particularly suitable for the treatment of high-temperature dust-containing tail gas. The dust collector air bag 132 at the top of the dust collector 100 is backblown regularly through the dust collector blowing pipe 133 to remove the surface material of the metal filter bag 108 to prevent blockage.

[0039] Furthermore, the metal filter bag 108, the fan 110, and the discharge pipe are made of 304 stainless steel; the dust collector air inlet 136 is provided with an air supply valve, which is made of 316L stainless steel. The air supply valve is provided with an automatic switch program to adjust the flow of the exhaust gas to prevent the internal temperature from being too high to affect the operation of the equipment and instruments, or the metal filter bag 108 surface from forming a colloid and causing blockage when the temperature is too low. The metal filter bag 108 is made of 304 stainless steel, which has good corrosion resistance and has a good tolerance effect on sulfuric acid dioxide mist in the exhaust gas.

[0040] In some specific embodiments of the present invention, Figure 2 , Figure 3As shown, the first-stage spray tower air inlet 138 and the first-stage spray tower air outlet 139 are respectively arranged at the lower part and the top of the first-stage spray tower 101, and two layers of first-stage spray tower fillers 112 are arranged between the first-stage spray tower air inlet 138 and the first-stage spray tower air outlet 139. Further, the two layers of first-stage spray tower fillers 112 are located between the first-stage spray tower air inlet 138 and the first nozzle 135-1; the second-stage spray tower air inlet 142 and the second-stage spray tower air outlet 143 are respectively arranged at the lower part and the top of the second-stage spray tower 105, and a layer of second-stage spray tower fillers 123 is arranged between the second-stage spray tower air inlet 142 and the second-stage spray tower air outlet 143. Further, the second-stage spray tower fillers 123 are located between the second-stage spray tower air inlet 138 and the second Between the nozzles 135-2, the first-level spray tower filler 112 and the second-level spray tower filler 123 can promote full contact between the exhaust gas and the spray alkali solution, thereby improving the spray absorption effect; the first-level spray tower air inlet 138 is provided with a first-level spray tower nozzle 129-1, and the second-level spray tower air inlet 142 is provided with a second-level spray tower nozzle 129-2. The nozzles at the spray tower air inlet clean the air inlet pipe by regular spraying. The water source adopts the high-temperature condensed water brought by the workshop, which can prevent the salt in the exhaust gas from crystallizing in the pipe and causing blockage; a swirl plate 124 is also provided below the second-level spray tower outlet 143, which is used to preliminarily remove the droplets entrained in the exhaust gas, reduce the concentration of droplets entering the rear end, relieve the working pressure of the wire mesh demister 106, and avoid excessive emissions.

[0041] Furthermore, the first-stage spray tower 101 is made of 316L stainless steel, and the two-layer first-stage spray tower filler 112 is made of 304 stainless steel; the second-stage spray tower 105 is made of PPH (homopolymer polypropylene) material, and the second-stage spray tower filler 123 is made of PPH; the dust collector 100 and the first-stage spray tower 101 are connected by a 316L stainless steel pipe.

[0042] In some specific embodiments of the present invention, Figure 2 As shown, the primary spray system is provided with an online filter 102, which filters the dust-containing spray alkali solution after absorbing the tail gas in the primary spray tower 101 to prevent the first nozzle 135-1 from being blocked by foreign matter; a pressure differential gauge 128 is provided inside the online filter 102 to measure the internal and external pressure difference of the filter element of the online filter 102; an online filter drain port 117 is provided at the bottom of the online filter 102 to connect the drain pipe to discharge the waste liquid. The online filter 102 is provided with a self-cleaning system. When the pressure difference reaches the set value, backwashing is started to remove the particles adsorbed on the surface of the filter screen to achieve the purpose of recycling; the online filter drain port 117 is connected to a solenoid valve, which is opened when online cleaning is performed, and the sludge is discharged to the ground pool through the pipe connected to the online filter drain port 117.

[0043] Furthermore, the shell material of the online filter 102 is 304 stainless steel.

[0044] In some specific embodiments of the present invention, Figure 2 , Figure 5 As shown, the pipeline heat exchanger 104 is arranged between the primary spray tower 101 and the secondary spray tower 105, and its function is to further cool the tail gas to prevent the high temperature tail gas from evaporating the spray alkali solution in the secondary spray tower 105 and forming water mist. A cooling water inlet 118 is provided on one side of the upper part of the pipe heat exchanger 104, and a cooling water outlet 121 is provided on the side of the lower part of the pipe heat exchanger 104 away from the cooling water inlet 118. The cooling water inlet 118 and the cooling water outlet 121 are connected through a cooling water pipe for heat exchange with the high-temperature exhaust gas. The cooling water is mainly cooled and circulated through a cooling tower installed in the factory or workshop; a spray pipe inlet 120 is provided on the other side of the upper part of the pipe heat exchanger 104, and a pipe heat exchanger sewage outlet 119 is provided on the other side of the lower part. A pipe heat exchanger nozzle 122 is provided on the top of the pipe heat exchanger 104. Spray water for cleaning enters the interior through the spray pipe inlet 120, and is sprayed out through the pipe heat exchanger nozzle 122 to flush the interior of the pipe heat exchanger 104. The waste liquid after flushing is discharged through the pipe heat exchanger sewage outlet 119. The temperature of the exhaust gas after passing through the primary spray tower 101 is still relatively high. Adding a pipeline heat exchanger 104 in the air duct can effectively reduce the exhaust gas temperature and avoid generating a large amount of steam in the secondary spray tower 105, which affects the dust removal effect. In addition, when the exhaust gas passes through the primary spray tower 101, the spray alkali solution will evaporate, causing the exhaust gas to be mixed with a large amount of water vapor. When the exhaust gas is cooled by the pipeline heat exchanger 104, the water vapor liquefies to form droplets, which are effectively removed in the secondary spray tower 105, avoiding the droplets carrying sodium sulfate solution into the exhaust gas detection system, causing the particulate matter monitoring to exceed the standard. The spray pipeline inlet 120 is connected to the steam condensation water tank, and the pipeline heat exchanger 104 is flushed by regular water supply to prevent its heat exchange efficiency from decreasing.

[0045] Furthermore, the main body of the pipe heat exchanger 104 is made of 304 stainless steel and is wrapped with 304 stainless steel.

[0046] In some specific embodiments of the present invention, Figure 2 , Figure 3As shown, the first-stage spray tower air inlet 138 is provided with a first-stage spray tower air inlet pipe structure 130-1, and the second-stage spray tower air inlet 142 is provided with a second-stage spray tower air inlet pipe structure 130-2. One end of the first-stage spray tower air inlet pipe structure 130-1 and the second-stage spray tower air inlet pipe structure 130-2 outputting exhaust gas is bent downward from the horizontal direction. Taking the first-stage spray tower air inlet pipe structure 130-1 as an example, its upper pipe wall 148-1 is longer than the lower pipe wall 149-1, which can prevent the spray alkali solution from flowing into the air inlet pipe and causing the pipe to be blocked by crystallization, and at the same time, it can prevent the spray alkali solution from staying at the air inlet pipe mouth for a long time to form crystals. The structure of the second-stage spray tower air inlet pipe structure 130-2 is the same as that of the first-stage spray tower air inlet pipe structure 130-1.

[0047] Furthermore, the air inlet pipes of the first-stage spray tower 101 and the second-stage spray tower 105 are variable in diameter and thickened along the exhaust gas flow direction. This structure can prevent the sprayed alkali solution from flowing back to the air inlet pipe, causing air flow obstruction.

[0048] In some specific embodiments of the present invention, Figure 2 As shown, the wire mesh 150 of the wire mesh demister 106 is located between the wire mesh demister air inlet 144 and the wire mesh demister air outlet 145, and its function is to further demister the tail gas, reduce the droplet content in the tail gas, and prevent the salt-containing droplets from entering the rear end, causing the online detection system to alarm and the particulate matter emission to exceed the standard; the wire mesh demister 106 is provided with a wire mesh demister water inlet 126 on one side of the upper part, and a wire mesh demister drain outlet 127 is provided on the lower side away from the wire mesh demister water inlet 126. The wire mesh demister 106 is provided in the front section of the exhaust pipe 107 to remove the remaining droplets in the tail gas, and the salt solution droplets entrained therein can be effectively intercepted, further ensuring that the particulate matter in the tail gas emission will not exceed the standard; the wire mesh demister 106 is provided with a cleaning system, and the water inlet of the wire mesh demister 106 adopts the steam condensate from the workshop to clean the wire mesh 150, remove the adhered salt, and the waste liquid is discharged from the wire mesh demister drain outlet 127.

[0049] Furthermore, a nozzle is provided at the water inlet 126 of the wire mesh demister, and the nozzle is connected to the steam condensate water tank through a pipeline, so as to regularly rinse the crystallized salt adsorbed on the wire mesh 150, and the degree of automation is relatively high.

[0050] Furthermore, the outer shell of the wire mesh demister 106 is made of PPH material; a temperature probe is provided at the air inlet 144 of the wire mesh demister.

[0051] In some specific embodiments of the present invention, Figure 2 , Figure 3As shown, the first-stage spray tower 101 is provided with a first differential pressure level gauge 114-1 and a first online pH meter 115-1 on the outside, which are used to transmit the liquid level signal and detect the actual pH value of the sprayed alkali solution, respectively. Since the air inlet temperature of the first-stage spray tower 101 is relatively high, there is a large amount of evaporation in the sprayed alkali solution, and the liquid level will drop over time. It is necessary to set up a liquid level interlock control program to automatically replenish water and alkali when the liquid level is low, and automatically drain water when the liquid level is high, thereby reducing the number of human operations. The second-stage spray tower 105 is provided with a second differential pressure level gauge 114-2 and a second online pH meter 115-2 on the outside, and their functions are the same as those of the first differential pressure level gauge 114-1 and the first online pH meter 115-1, respectively. The online pH meter is used to detect the pH value of the spray alkali solution in real time. Since the pH value of the spray alkali solution will gradually decrease during the process of absorbing the exhaust gas containing acid mist, when it is detected that the pH of the spray alkali solution is lower than a certain value, alkali replenishment is required to maintain the absorption effect of the spray alkali solution; at the same time, since the high temperature of the exhaust gas will cause a large amount of water in the spray alkali solution to evaporate, the liquid level in the water collecting tank will gradually decrease. In order to avoid affecting the absorption effect, when the differential pressure level gauge detects that the liquid level in the water collecting tank is lower than a certain value, water replenishment is required.

[0052] Furthermore, both the primary spray tower 101 and the secondary spray tower 105 are provided with an automatic alkali replenishment program, an automatic drainage program and an automatic water replenishment program; the bottoms of the primary spray tower 101 and the secondary spray tower 105 are provided with a first bottom vent 116-1 and a second bottom vent 116-2, respectively. The setting of the automatic alkali replenishment program, the automatic drainage program and the automatic water replenishment program makes the primary spray tower 101 and the secondary spray tower 105 have a high degree of automation. In order to avoid the enrichment of particulate matter and salt in the spray alkali solution, the primary spray tower 101 and the secondary spray tower 105 are provided with a special drainage program. When the pH drops to a low value, the water replenishment operation is performed first. After the water is replenished to a certain liquid level, the water replenishment program is run after the water is drained through the first bottom vent 116-1 and the second bottom vent 116-2, respectively, to replace the spray alkali solution and enhance the spraying effect.

[0053] In some specific embodiments of the present invention, Figure 2 As shown, the material of the exhaust pipe 107 is PPH, and the exhaust gas is discharged to the outside through the exhaust pipe 107.

[0054] Furthermore, an online dust detector is provided in the exhaust chimney 107 .

[0055] According to some specific embodiments of the utility model, after the device is modified in the above manner, the high-temperature acid mist dust-containing tail gas enters the dust collector 100 from the rotary kiln outlet through the tail gas pipeline and the dust collector air inlet 136, and the dust is intercepted on the surface of the metal filter bag 108. Under the action of the back-blowing gas, the dust particles fall into the silo of the dust collector 100 and enter the collection bag through the fan 110 and the dust collector unloading butterfly valve 131. Since the dust collector unloading butterfly valve 131 is opened at intervals, the high-pressure back-blowing gas will not directly enter the collection bag. The tail gas passing through the metal filter bag 108 flows out from the dust collector outlet 137, passes through the stainless steel pipe and enters the first-level spray tower 101; the first-level spray tower 101 has a variable diameter inlet duct, and the pipe inside the tower is provided with a wedge-shaped first-level spray tower inlet pipe structure 130-1, the upper pipe wall 148-1 is longer than the lower pipe wall 149-1, and the outlet end of the internal pipe is provided with a curved shape, so as to avoid the sprayed alkali solution staying in the inlet duct for a long time to form crystals; secondly, a first-level spray tower nozzle 129-1 is provided at the inlet duct, and a timed spray is set to regularly flush the accumulated salt at the first-level spray tower inlet 138 to avoid crystallization; the first-level spray of the tail gas The tower 101 is sprayed with the first-level spray tower filler 112 (which can be a ball ring filler) and alkali solution, and the sulfur dioxide and sulfuric acid trioxide mist are absorbed, and the tail gas is discharged into the rear end through the first-level spray tower outlet 139; the first-level spray system is provided with a first power device 146 (which can be a circulating pump) to drive the spray alkali solution to flow in the first spray pipe 113-1. After the tail gas passes through the first-level spray tower 101, a large amount of heat and dust particles are absorbed by the spray alkali solution. The high-temperature spray alkali solution passes through the online filter 102 to remove internal particles, and then enters the first plate heat exchanger 103 for cooling, so that the temperature of the spray alkali solution drops, and the temperature of the tail gas entering the rear end is reduced. The online filter 102 is provided with a differential pressure gauge 128, which automatically flushes after reaching a certain pressure, and flushes impurities into the ground pool; the circulating water of the first plate heat exchanger 103 is connected to the workshop cooling tower and circulates regularly. The spray alkali liquid of the first-level spray tower 101 is provided with an automatic alkali replenishment and drainage program. When the pH value is lower than a certain value, the system automatically replenishes alkali and drains water. At the same time, due to the large amount of evaporation of water, the liquid level of the first-level spray tower 101 will gradually decrease. In order to avoid affecting the absorption effect, an automatic water replenishment program is provided. In order to avoid the enrichment of particulate matter and salt, the first-level spray tower 101 is provided with a special drainage program. When the pH value drops to a low value, the first-level spray tower 101 is firstly replenished with water. After replenishing to a certain liquid level, the water replenishment program is run after drainage is carried out through the first bottom vent 116-1 to replace the spray alkali liquid and enhance the spraying effect.

[0056] After the tail gas comes out of the first-stage spray tower 101, it enters the pipeline heat exchanger 104, and the tail gas temperature further drops from 80-90°C to 40-50°C; the pipeline heat exchanger 104 is provided with a spray flushing system, and the flushing water is set to the high-temperature steam condensate of the workshop, and the enriched salt is regularly flushed to avoid crystallization blockage.

[0057] The tail gas after cooling enters the secondary spray tower 105, passes through the spray system, and the residual acid mist is absorbed. Part of the atomized droplets are liquefied and enriched in the secondary spray tower 105, causing the liquid level of the secondary spray tower 105 to rise. The secondary spray tower 105 is equipped with an automatic drainage and alkali replenishment program. When the liquid level is higher than a certain value, it will automatically drain, and when the pH is lower than a certain value, it will automatically replenish alkali. Its drainage and alkali replenishment program is the same as the first-level spray tower 101. The spray alkali solution in the secondary spray tower 105 is driven by the second power device 147 (which can be a circulating pump) and flows in the second spray pipe 113-2. The second plate heat exchanger 125 is installed on the second spray pipe 113-2, and the operation mode is consistent with the first plate heat exchanger 103 of the first-level spray tower 101.

[0058] After passing through the secondary spray tower 105, the acid mist in the tail gas has been fully absorbed, and after being discharged from the secondary spray tower outlet 143, it enters the rear-end wire mesh demister 106, and the residual salt droplets in the tail gas are adsorbed. After defogged, the tail gas enters the exhaust pipe 107 and is discharged to the outside. The wire mesh demister 106 is provided with a spray system, and the wire mesh demister 106 is regularly flushed with high-temperature steam condensate to avoid clogging.

[0059] It can be seen that the high-temperature acid mist and dust-containing exhaust gas treatment device of the utility model is combined with a multi-stage filtration system, a spray system, a heat exchange system, and a defogger system, so that the treated exhaust gas can meet the emission standards; and each device is made of high-temperature resistant and corrosion-resistant materials, which is particularly suitable for exhaust gas treatment in the new energy field; at the same time, it is also equipped with automatic cleaning, automatic water and alkali replenishment, and automatic drainage systems, with a high degree of automation.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A new type of high-temperature acid mist and dusty tail gas treatment device, characterized in that: include: A dust collector (100), wherein the dust collector (100) is provided with a dust collector air inlet (136) and a dust collector air outlet (137); A primary spray system, the primary spray system comprising a primary spray tower (101), the primary spray tower (101) being provided with a primary spray tower air inlet (138) and a primary spray tower air outlet (139), the primary spray tower air inlet (138) being connected to the dust collector air outlet (137); A pipeline heat exchanger (104), wherein the pipeline heat exchanger (104) is provided with a pipeline heat exchanger air inlet (140) and a pipeline heat exchanger air outlet (141), and the pipeline heat exchanger air inlet (140) is connected to the first-stage spray tower air outlet (139); A secondary spray system, the secondary spray system comprising a secondary spray tower (105), the secondary spray tower (105) being provided with a secondary spray tower air inlet (142) and a secondary spray tower air outlet (143), the secondary spray tower air inlet (142) being connected to the air outlet (141) of the pipeline heat exchanger; A wire mesh demister (106), wherein the wire mesh demister (106) is provided with a wire mesh demister air inlet (144) and a wire mesh demister air outlet (145), and the wire mesh demister air inlet (144) is connected to the secondary spray tower air outlet (143); An exhaust pipe (107), wherein the exhaust pipe (107) is connected to the air outlet (145) of the wire mesh demister.

2. The novel high-temperature acid mist and dust-containing tail gas treatment device according to claim 1 is characterized in that: The primary spray system further comprises an online filter (102), a first plate heat exchanger (103) and a first power device (146), wherein the online filter (102), the first plate heat exchanger (103) and the first power device (146) are arranged outside the primary spray tower (101); the primary spray tower (101) comprises a first water collecting tank (134-1) and a first spray head (135-1), wherein the first water collecting tank (134-1) is arranged at the bottom of the primary spray tower (101), and the first spray head (135-1) is arranged at the top of the primary spray tower (101), and the first water collecting tank (134-1) stores spray alkali solution, and the first water collecting tank (134-1), the online filter (102), the first plate heat exchanger (103), the first power device (146) and the first spray head (135-1) are sequentially connected through a first spray pipe (113-1).

3. The novel high-temperature acid mist and dust-containing tail gas treatment device according to claim 1 is characterized in that: The secondary spray system further comprises a second plate heat exchanger (125) and a second power device (147), wherein the second plate heat exchanger (125) and the second power device (147) are arranged outside the secondary spray tower (105); the secondary spray tower (105) comprises a second water collecting tank (134-2) and a second spray head (135-2), wherein the second water collecting tank (134-2) is arranged at the bottom of the secondary spray tower (105), and the second spray head (135-2) is arranged at the upper part of the secondary spray tower (105); the second water collecting tank (134-2) stores spray alkali solution, and the second water collecting tank (134-2), the second power device (147), the second plate heat exchanger (125) and the second spray head (135-2) are sequentially connected through a second spray pipe (113-2).

4. The novel high-temperature acid mist and dust-containing tail gas treatment device according to claim 1 is characterized in that: The dust collector (100) comprises a metal filter bag (108), a blower (110), a dust collector discharge butterfly valve (131), a dust collector air bag (132), a dust collector blowing pipe (133) and a remote pressure differential gauge (109); the dust collector air inlet (136) is arranged at the lower part of the dust collector (100), the dust collector air outlet (137) is arranged at the upper part of the dust collector (100), and the metal filter bag (108) is arranged between the dust collector air inlet (136) and the dust collector air outlet (137); the blower (110) is arranged at the lower part of the dust collector (100), and the dust collector air inlet (136) is arranged at the upper part of the dust collector (100). The fan (110) is arranged at the bottom of the dust collector (100), a discharge pipe is arranged at the bottom of the fan (110), and the dust collector discharge butterfly valve (131) is arranged on the discharge pipe; the dust collector air bag (132) is arranged at the top of the dust collector (100), the dust collector air bag (132) is connected to the dust collector blowing pipe (133), and the dust collector blowing pipe (133) is installed above the metal filter bag (108); the remote pressure differential gauge (109) is arranged outside the dust collector (100).

5. The novel high-temperature acid mist and dust-containing tail gas treatment device according to claim 1 is characterized in that: The first-stage spray tower air inlet (138) is arranged at the lower part of the first-stage spray tower (101), and the first-stage spray tower air outlet (139) is arranged at the top of the first-stage spray tower (101); the first-stage spray tower (101) comprises two layers of first-stage spray tower fillers (112), and the first-stage spray tower fillers (112) are located between the first-stage spray tower air inlet (138) and the first-stage spray tower air outlet (139); the second-stage spray tower air inlet (142) is arranged at the lower part of the second-stage spray tower (105), and the second-stage spray tower air outlet (143) is arranged at the top of the second-stage spray tower (105); The top of a secondary spray tower (105), the secondary spray tower (105) comprising a swirl plate (124) and a layer of secondary spray tower filler (123), the secondary spray tower filler (123) being located between the secondary spray tower air inlet (142) and the secondary spray tower air outlet (143), the swirl plate (124) being arranged below the secondary spray tower air outlet (143); a primary spray tower nozzle (129-1) being arranged at the primary spray tower air inlet (138), and a secondary spray tower nozzle (129-2) being arranged at the secondary spray tower air inlet (142).

6. The novel high-temperature acid mist and dust-containing tail gas treatment device according to claim 2 is characterized in that: The online filter (102) comprises a pressure differential gauge (128) and an online filter sewage outlet (117); the pressure differential gauge (128) is arranged inside the online filter (102); the online filter sewage outlet (117) is arranged at the bottom of the online filter (102); the online filter sewage outlet (117) is connected to a sewage pipe to discharge waste liquid.

7. The novel high-temperature acid mist and dust-containing tail gas treatment device according to claim 1 is characterized in that: The pipe heat exchanger air inlet (140) and the pipe heat exchanger air outlet (141) are respectively located on the left and right sides of the pipe heat exchanger (104); a cooling water inlet (118) is provided on one side of the upper part of the pipe heat exchanger (104), and a cooling water outlet (121) is provided on the lower side of the pipe heat exchanger (104) away from the cooling water inlet (118); a spray pipe inlet (120) is provided on the other side of the upper part of the pipe heat exchanger (104), a pipe heat exchanger nozzle (122) is provided at the top end of the inner part of the pipe heat exchanger (104), and the pipe heat exchanger nozzle (122) is connected to the spray pipe inlet (120); a pipe heat exchanger sewage outlet (119) is provided on the other side of the lower part of the pipe heat exchanger (104); the cooling water inlet (118) and the cooling water outlet (121) are connected through a cooling water pipe.

8. The novel high-temperature acid mist and dust-containing tail gas treatment device according to claim 1 is characterized in that: The first-stage spray tower air inlet (138) is provided with a first-stage spray tower air inlet pipe structure (130-1), and the second-stage spray tower air inlet (142) is provided with a second-stage spray tower air inlet pipe structure (130-2); one end of the first-stage spray tower air inlet pipe structure (130-1) and the second-stage spray tower air inlet pipe structure (130-2) for outputting exhaust gas is bent downward from the horizontal direction.

9. The novel high-temperature acid mist and dust-containing tail gas treatment device according to claim 1 is characterized in that: The wire mesh demister (106) comprises a wire mesh (150), and the wire mesh (150) is arranged between the wire mesh demister air inlet (144) and the wire mesh demister air outlet (145); a wire mesh demister water inlet (126) is provided on one side of the upper part of the wire mesh demister (106), and a wire mesh demister drain outlet (127) is provided on the lower side of the wire mesh demister (106) away from the wire mesh demister water inlet (126).

10. The novel high-temperature acid mist and dust-containing tail gas treatment device according to claim 1 is characterized in that: The first-stage spray tower (101) further comprises a first differential pressure level gauge (114-1) and a first online pH meter (115-1), and the second-stage spray tower (105) further comprises a second differential pressure level gauge (114-2) and a second online pH meter (115-2).

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