High-temperature sulfur-containing waste gas treatment equipment

Abstract

The utility model discloses high-temperature sulfur-containing waste gas treatment equipment which comprises a venturi tube, a cyclone dust collector, a reverse spraying tube and a spraying tower, waste gas enters from one end of the venturi tube, and a first spraying gun is arranged at a throat tube of the venturi tube; an air inlet is formed in the bottom of the side wall of the cyclone dust collector, an air outlet is formed in the top of the side wall of the cyclone dust collector, and the air inlet is connected with the other end of the Venturi tube; one end of the reverse spraying pipe is connected with the air outlet, and a reverse spraying head is arranged in the reverse spraying pipe; an inner cavity of the spraying tower is communicated with the other end of the reverse spraying pipe, a spraying device is arranged in the spraying tower, and an outlet of the spraying tower is formed in the top of the spraying tower; according to the waste gas treatment device, waste gas can be sequentially treated through the Venturi tube, the cyclone dust collector, the reverse spraying tube and the spray tower, the temperature and the content of harmful substances of the waste gas subjected to three-time pretreatment are effectively reduced, the flash evaporation condition is further avoided, the good condition that the waste gas enters the spray tower to be treated is achieved, and therefore the treatment efficiency of the spray tower is improved.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment equipment, and in particular to a high-temperature sulfur-containing waste gas treatment equipment. Background Technology

[0002] The waste gas generated by the rotary kiln in the existing ferric phosphate roasting workshop has excessively high temperature and sulfur content. Directly feeding it into the desulfurization spray tower would cause flash evaporation of the circulating alkaline solution, generating a large amount of aerosol salt particles that enter the flue gas, leading to excessive particulate matter levels. Furthermore, due to the high flue gas temperature, it is difficult to effectively reduce the temperature of the circulating spray in the spray tower, resulting in low efficiency of the spray tower. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a high-temperature sulfur-containing waste gas treatment device.

[0004] The technical solution of this utility model is as follows: it includes a venturi tube, a cyclone dust collector, a reverse spray pipe, and a spray tower. Exhaust gas enters from one end of the venturi tube, and a first spray gun for spraying liquid is provided at the throat of the venturi tube. An air inlet is provided at the bottom of the side wall of the cyclone dust collector, and an air outlet is provided at the top of the side wall of the cyclone dust collector. The air inlet is connected to the other end of the venturi tube. One end of the reverse spray pipe is connected to the air outlet, and a reverse nozzle for spraying liquid is provided inside the reverse spray pipe. The spray direction of the reverse nozzle is opposite to the airflow direction inside the reverse spray pipe. The inner cavity of the spray tower is connected to the other end of the reverse spray pipe, and the outlet of the spray tower is located at the top of the spray tower. A spraying device is provided inside the spray tower between the other end of the reverse spray pipe and the outlet.

[0005] Furthermore, the spray tower includes a liquid receiving tray connected to its inner wall, which divides the spray tower into a lower primary tower and an upper secondary tower. The other end of the reverse spray pipe is connected to the side wall of the primary tower and communicates with the inner cavity of the primary tower. The outlet is located at the top of the secondary tower. The spraying device includes a second spray gun located in the primary tower and a third spray gun located in the secondary tower. The second spray gun is located above the other end of the reverse spray pipe.

[0006] The liquid receiving tray is provided with several connecting ports that connect the primary tower and the secondary tower, and the waste gas in the primary tower can enter the secondary tower through the connecting ports.

[0007] Furthermore, the first-stage tower is equipped with a first circulating liquid tank, and the liquid in the first circulating liquid tank can be pumped to the reverse nozzle and the second spray gun through pipelines respectively;

[0008] The first circulating liquid tank is located at the other end of the reverse nozzle and below the second spray gun. The reverse nozzle is located above the other end of the reverse nozzle. The liquid sprayed from the reverse nozzle flows into the first circulating liquid tank through the other end of the reverse nozzle. The liquid sprayed from the second spray gun falls into the first circulating liquid tank.

[0009] Furthermore, it also includes a heat exchanger, which is located inside the first circulating liquid tank, and circulating cooling water is circulated through the heat exchanger.

[0010] Furthermore, it also includes a second circulating liquid tank, which is located outside the spray tower. A water-blocking cap is provided above each of the communication ports. The water-blocking cap can prevent the liquid sprayed by the third spray gun from falling into the first-stage tower through the communication port. The liquid receiving tray can receive the liquid sprayed by the third spray gun and can transport it to the second circulating liquid tank through the pipeline. The liquid in the second circulating liquid tank can be pumped to the first spray gun and the third spray gun respectively through the pipeline.

[0011] Furthermore, the outlet of the spray tower is connected to an air outlet pipe, and a condenser and a first demister are installed inside the air outlet pipe. The condenser and the first demister are arranged sequentially along the airflow direction. The air outlet pipe has a water collection section for receiving condensate, and the water collection section is connected to the second circulating liquid tank.

[0012] Furthermore, the condenser includes a condenser tube, and flushing pipes are respectively provided on one side of the condenser and one side of the first demister.

[0013] Furthermore, the secondary tower is provided with a packing layer and a second demister. The packing layer is located between the third spray gun and the liquid receiving tray. The second demister is located above the third spray gun. A backflush pipe is provided between the second demister and the third spray gun. The backflush pipe can spray liquid to clean the second demister.

[0014] Furthermore, the cyclone dust collector is a wet cyclone dust collector, and a dust collection device is connected to the bottom of the cyclone dust collector. The dust that settles in the cyclone dust collector falls into the dust collection device through an electric double-layer flap valve.

[0015] Furthermore, it also includes a high-temperature dust collector, through which the exhaust gas enters the venturi tube; one end of the venturi tube is higher than the other end; the reverse nozzle adopts a large-diameter open nozzle, the diameter of which ranges from 50mm to 100mm.

[0016] The high-temperature sulfur-containing waste gas treatment equipment of this utility model has at least the following technical effects: By incorporating a Venturi tube, a cyclone dust collector, a reverse spray pipe, and a spray tower, the waste gas can be treated sequentially through these components. The Venturi tube provides preliminary treatment of the high-temperature sulfur-containing waste gas via a first spray gun. The cyclone dust collector further desulfurizes and cools the waste gas. The reverse spray pipe ensures close counter-current contact between the waste gas and liquid, rapidly cooling and washing the sulfur dioxide in the waste gas. After these three pretreatment processes, the temperature and harmful substance content of the waste gas are effectively reduced, thus preventing flash evaporation and ensuring proper entry into the system. The favorable conditions for treatment within the spray tower improve its efficiency. The Venturi tube allows liquid to be introduced to remove some acidic gases, reducing the load on the secondary tower. Waste brine from the secondary tower spray can be introduced into the Venturi tube, reducing the brine concentration in the scrubbing tower and alleviating salt buildup. The flue gas treated by the spray tower enters the condenser to condense and precipitate condensate, which is then removed by a subsequent wire mesh demister. The condenser and demister are regularly flushed with flushing pipes to prevent blockage. The condensate recovered from the condenser is piped into the second circulating liquid tank to replenish the evaporation water consumed by the Venturi tube, achieving water recycling and reducing water consumption.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Additional aspects and advantages of this utility model will become apparent and readily understood from the description of the technical solution in conjunction with the following drawings, wherein:

[0019] Figure 1 This is a schematic diagram of the structure of the high-temperature sulfur-containing waste gas treatment equipment according to the present invention.

[0020] Figure 2 This is a schematic diagram of the spray tower structure;

[0021] Figure 3 This is a schematic diagram of the spacing structure between the first and second level towers;

[0022] Figure 4 This is a schematic diagram of the internal structure of the vent pipe.

[0023] Figure reference numerals: Venturi tube 100, first spray gun 110, flue gas inlet expansion joint 120, cyclone dust collector 200, air inlet 210, air outlet 220, dust collection device 230, inspection door 240, dust removal hole 250, electric double-layer flap valve 260, reverse spray pipe 300, reverse spray head 310, spray tower 400, third pipe 401, fourth pipe 402, third pump 403, spray device 410, second spray gun 411, third spray gun 412, liquid receiving tray 420, connecting port 42 1. Water baffle 422, water outlet pipe 423, primary tower 430, first circulating liquid tank 431, secondary tower 440, packing layer 441, second demister 442, backflushing pipe 443, air outlet pipe 450, condenser 451, first demister 452, water collection section 453, flushing pipe 454, first pipeline 460, second pipeline 470, first pump 480, second pump 490, heat exchanger 500, circulating cooling water outlet 510, circulating cooling water inlet 520, second circulating liquid tank 600. Detailed Implementation

[0024] The technical solution of this utility model is described in detail below. Examples of the technical solution are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The technical solution described below with reference to the accompanying drawings is exemplary and is only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0028] Reference Figure 1As shown, the high-temperature sulfur-containing waste gas treatment equipment provided in the embodiment of this utility model includes a venturi tube 100, a cyclone dust collector 200, a reverse spray pipe 300, and a spray tower 400. The waste gas enters from one end of the venturi tube 100, and a first spray gun 110 for spraying liquid is provided at the throat of the venturi tube 100. An air inlet 210 is opened at the bottom of the side wall of the cyclone dust collector 200, and an air outlet 220 is opened at the top of the side wall of the cyclone dust collector 200. The air inlet 210 and the venturi tube... The other end of 100 is connected; one end of the reverse nozzle 300 is connected to the air outlet 220, and the reverse nozzle 300 is provided with a reverse nozzle 310 for spraying liquid. The spraying direction of the reverse nozzle 310 is opposite to the airflow direction in the reverse nozzle 300; the inner cavity of the spray tower 400 is connected to the other end of the reverse nozzle 300, the outlet of the spray tower 400 is located at the top of the spray tower 400, and a spraying device 410 is provided inside the spray tower 400 between the other end of the reverse nozzle 310 and the outlet.

[0029] By incorporating a Venturi tube 100, a cyclone dust collector 200, a reverse spray pipe 300, and a spray tower 400, the exhaust gas can be treated sequentially through these components. The Venturi tube 100 provides preliminary treatment of the high-temperature, sulfur-containing exhaust gas via the first spray gun 110. The cyclone dust collector 200 further desulfurizes and cools the exhaust gas. The reverse spray pipe 300 ensures close counter-current contact between the exhaust gas and liquid, rapidly cooling the sulfur dioxide in both the exhaust gas and the washing exhaust gas. After these three pretreatments, the temperature and harmful substance content of the exhaust gas are effectively reduced, thus preventing flash evaporation and providing favorable conditions for entry into the spray tower 400 for further treatment, thereby improving the treatment efficiency of the spray tower 400. Furthermore, the variable diameter design of the Venturi tube 100 accelerates the flow rate of the exhaust gas, allowing for rapid mixing and contact between the exhaust gas and liquid, thus enhancing the cooling effect.

[0030] The waste gas treated by this invention is the waste gas generated by the roasting of ferric phosphate in the ferric phosphate synthesis workshop. The waste gas treatment equipment of this invention can also treat other high-temperature sulfur-containing waste gases.

[0031] like Figure 1 As shown, during operation:

[0032] The waste gas containing sulfur at 300℃~400℃ is transported to the Venturi tube 100, where the first spray gun 110 sprays it to cool it down quickly.

[0033] After pretreatment by the Venturi tube 100, the exhaust gas enters the cyclone dust collector 200 through the inlet 210. Since the outlet 220 of the cyclone dust collector 200 is located above the inlet 210, the exhaust gas can spiral upward inside the cyclone dust collector 200 and be discharged from the top side of the cyclone dust collector 200, thereby further desulfurizing and cooling the exhaust gas, and removing the particulate matter generated during spraying through centrifugal force, which falls to the bottom of the cyclone dust collector 200 for collection.

[0034] The exhaust gas, cooled by the Venturi tube 100 and the cyclone dust collector 200, is about 220°C. The exhaust gas enters the reverse spray pipe 300, where the reverse spray head 310 sprays liquid to further treat the exhaust gas, so that the exhaust gas and the liquid sprayed by the reverse spray head 310 come into reverse contact, thereby further cooling and washing the exhaust gas.

[0035] After being processed by the Venturi tube 100, cyclone dust collector 200 and reverse spray pipe 300, the temperature of the flue gas has been effectively reduced to about 75°C, which meets the conditions for entering the spray tower 400 for good treatment. After the waste gas enters the spray tower 400, the spray device 410 treats the waste gas, and the treated gas is discharged through the outlet at the top of the spray tower 400.

[0036] Specifically, the Venturi tube 100 includes a head constriction section, a throat section, and a tail diffusion section. Understandably, the Venturi tube 100 is a common type of Venturi tube in the art.

[0037] Specifically, a flue gas inlet expansion joint is provided at one end of the venturi tube 100 to compensate for the thermal deformation of the pipeline, eliminate or reduce the deformation stress of the pipeline, and improve the service life of the pipeline.

[0038] Specifically, the first spray gun 110 can spray liquid, which can be water or lime slurry. While ensuring the cooling of the exhaust gas, the first spray gun 110 can also spray other liquids, such as brine from the spray tower. The liquid source for the first spray gun 110 can be an external storage tank or alkaline circulating water from the spray tower 400.

[0039] Specifically, the Venturi tube 100 is made of carbon steel and has a 200mm thick castable refractory inside. Alternatively, other corrosion-resistant and high-temperature resistant materials can be used, provided that the Venturi tube 100 can safely handle the exhaust gas.

[0040] Specifically, the cyclone dust collector 200 is a wet cyclone dust collector. The brine evaporated inside the Venturi tube 100 can be effectively removed by the wet cyclone dust collector.

[0041] Specifically, such as Figure 1 As shown, the air inlet 210 and the air outlet 220 are located on the left and right side walls of the cyclone dust collector 200, respectively.

[0042] Specifically, the bottom of the cyclone dust collector 200 is provided with an inspection door 240 and a dust removal hole 250; the inspection door 240 facilitates the inspection of the inside of the cyclone dust collector 200; the dust removal hole 250 facilitates the cleaning of dust inside the cyclone dust collector 200.

[0043] Specifically, the material of the reverse nozzle 300 is 316L. While ensuring that the reverse nozzle 300 can safely handle exhaust gas, other corrosion-resistant and high-temperature resistant materials can also be used.

[0044] Specifically, the liquid source for the reverse nozzle 300 can be an external storage tank or the spray liquid inside the spray tower 400.

[0045] Specifically, the inlet of the spray tower 400 is located on the left side of the spray tower 400 and below the air outlet 220. The reverse spray pipe 300 is connected to the inlet.

[0046] Furthermore, such as Figure 1 , 2 As shown in Figure 3, the spray tower 400 includes a liquid receiving tray 420 connected to its inner wall. The liquid receiving tray 420 divides the spray tower 400 into a primary tower 430 located below and a secondary tower 440 located above. The other end of the reverse spray pipe 300 is connected to the side wall of the primary tower 430 and communicates with the inner cavity of the primary tower 430. The outlet is located at the top of the secondary tower 440. The spray device 410 includes a second spray gun 411 located in the primary tower 430 and a third spray gun 412 located in the secondary tower 440. The second spray gun 411 is located above the other end of the reverse spray pipe 300.

[0047] The liquid receiving tray 420 is provided with several connecting ports 421 that connect the primary tower 430 and the secondary tower 440. The airflow in the primary tower 430 can enter the secondary tower 440 through the connecting ports 421.

[0048] With the liquid receiving tray 420 provided, the gas in the primary column 430 can enter the secondary column 440 through the connecting port 421, and the gas undergoes two treatments through the primary column 430 and the secondary column 440.

[0049] Specifically, such as Figure 1 As shown, the other end of the reverse nozzle 300 extends into the primary tower 430 and faces downwards, thus ensuring that the liquid sprayed by the second spray gun 411 can better treat the exhaust gas. Of course, the other end of the reverse nozzle 300 may not face downwards; for example, it can face horizontally or upwards, and can be arranged reasonably according to needs. The other end of the reverse nozzle 300 may also terminate directly at the connection with the side wall of the spray tower 400 (i.e., the inlet of the spray tower 400) without extending into the interior of the spray tower 400.

[0050] Furthermore, such as Figure 1 As shown, the first-stage tower 430 is equipped with a first circulating liquid tank 431 for collecting the liquid sprayed from the reverse nozzle 310 and the liquid sprayed from the second spray gun 411. The liquid in the first circulating liquid tank 431 can be pumped to the reverse nozzle 310 and the second spray gun 411 respectively.

[0051] The first circulating liquid tank 431 is located at the other end of the reverse nozzle 300 and below the second spray gun 411. The reverse nozzle 310 is located above the other end of the reverse nozzle. The liquid sprayed from the reverse nozzle 310 flows into the first circulating liquid tank 431 through the other end of the reverse nozzle. The liquid sprayed from the second spray gun 411 falls into the first circulating liquid tank 431. The reverse nozzle 310 is a large-diameter open nozzle.

[0052] A first circulating liquid tank 431 is provided so that the reverse nozzle 310 and the second spray gun 411 can share the liquid in the first circulating liquid tank 431 and make full use of the liquid in the first circulating liquid tank 431.

[0053] The reverse nozzle 310 adopts a large-diameter open nozzle with a diameter range of 50mm-100mm. Due to the use of a large-diameter open nozzle, there are no fine droplets generated by atomization in the exhaust gas. After the liquid comes out of the reverse nozzle 310 upward, it comes into contact with the downward flowing exhaust gas to form a foam zone (this highly turbulent standing wave foam zone is generated by the high mass transfer between the droplets and the exhaust gas). This foam zone is a strong turbulent area where the gas and liquid are fully mixed and the liquid contact surface is renewed at high speed. The force of the exhaust gas will cause the liquid to splash in all directions. The turbulent film of the liquid will wrap the dust and gaseous pollutants in the exhaust gas, causing the exhaust gas to cool down suddenly and the acidic gas to be absorbed. The liquid after contact and the treated exhaust gas enter the spray tower 400 through the other end of the reverse nozzle 300.

[0054] Specifically, such as Figure 1 As shown, it also includes a first pipe 460, a second pipe 470, a first pump 480 and a second pump 490. The reverse nozzle 310 is connected to the bottom of the first circulating liquid tank 431 through the first pipe 460. The first pump 480 is installed on the first pipe 460. The second spray gun 411 is connected to the first circulating liquid tank 431 through the second pipe 470. The second pump 490 is installed on the second pipe 470.

[0055] When the reverse nozzle 310 needs to spray, the first pump 480 starts, and the liquid in the first circulating liquid tank 431 is transported to the reverse nozzle 310 through the first pipe 460. The reverse nozzle 310 sprays the liquid upward, and the liquid that falls flows along the reverse nozzle pipe 300 and flows back into the first circulating liquid tank 431.

[0056] When the second spray gun 411 needs to spray, the second pump 490 starts, and the liquid in the first circulating liquid tank 431 is transported to the second spray gun 411 through the second pipe 470.

[0057] Furthermore, such as Figure 1 As shown, it also includes a heat exchanger 500, which is located in the first circulating liquid tank 431. Circulating cooling water is introduced into the heat exchanger to cool the liquid in the first circulating liquid tank 431.

[0058] Since the heat exchange of the exhaust gas mainly takes place in the first-stage tower 430, in order to effectively dissipate the heat accumulated in the first-stage tower 430, a heat exchanger 500 is installed in the first circulating liquid tank 431. The circulating cooling water is used to cool the circulating liquid in the first-stage tower 430, which can reduce the temperature of the circulating liquid by 2℃~3℃, thereby carrying away the heat in the exhaust gas in time.

[0059] Specifically, it also includes a cooling water supply device (not shown in the figure). The cooling water supply device is located outside the spray tower 400. The heat exchanger 500 is connected to the cooling water supply device. The circulating cooling water 431 flows into the heat exchanger 500 from the cooling water supply device. The cooling water flowing out of the heat exchanger 500 can be circulated into the cooling water supply device or discharged directly.

[0060] Specifically, heat exchanger 500 is a coil heat exchanger. However, other heat exchangers can also be used to ensure that the circulating liquid can be cooled.

[0061] Specifically, such as Figure 1 As shown, the heat exchanger 500 has a circulating cooling water outlet 510 and a circulating cooling water inlet 520. Both the circulating cooling water outlet 510 and the circulating cooling water inlet 520 extend outside the spray tower 400 for easy connection to the cooling water supply equipment.

[0062] Furthermore, such as Figure 1 As shown, it also includes a second circulating liquid tank 600, which is located outside the spray tower 400. Each connecting port 421 is provided with a corresponding water baffle cap 422. The water baffle cap 422 can prevent the liquid sprayed by the third spray gun 412 from falling into the first-stage tower 430 through the connecting port 421. The liquid receiving tray 420 can receive the liquid sprayed by the third spray gun 412 and can transport it to the second circulating liquid tank 600 through the pipeline. The liquid in the second circulating liquid tank 600 can be pumped to the first spray gun 110 and the third spray gun 412 respectively.

[0063] By incorporating a second circulating liquid tank 600, the liquid within the secondary tower 440 can be fully utilized to store circulating alkali solution while simultaneously meeting the spraying requirements of the Venturi tube 100 and the third spray gun 412. Since the exhaust gas entering the Venturi tube 100 is initially at a high temperature, the high-salt wastewater that should have been discharged from the second circulating liquid tank 600 can be directly transported to the Venturi tube 100 for treatment. This allows the high-salt wastewater to evaporate directly within the Venturi tube 100 and be recovered by the cyclone dust collector 200, thus treating the high-salt wastewater and cooling the high-temperature exhaust gas. Consequently, some acidic gases can be removed from the exhaust gas within the Venturi tube 100, reducing the load on the secondary tower 440, decreasing the brine concentration within the secondary tower 440, alleviating salt buildup in the spray tower 400, and extending the continuous operating time of the secondary tower 440. Furthermore, the presence of a water baffle cap 422 ensures that the liquid sprayed from the third spray gun 412 does not enter the primary tower 430.

[0064] Specifically, such as Figure 1 As shown, the third spray gun 412 is connected to the second circulating liquid tank 600 through the third pipe 401, and the first spray gun 110 is connected to the third pipe 401 through the fourth pipe 402. The third pump 403 is installed on the third pipe 401.

[0065] The connection point between the fourth pipe 402 and the third pipe 401 is located above the third pump 403, so that the first spray gun 110 and the third spray gun 412 share a third pump 403, or the fourth pipe 402 is directly connected to the second circulating liquid tank 600. The fourth pipe 402 is equipped with a fourth pump, so that the first spray gun 110 and the third spray gun 412 are supplied with liquid respectively.

[0066] Specifically, both the third pipe 401 and the fourth pipe 402 are equipped with valves for controlling the opening and closing of the pipes.

[0067] Specifically, such as Figure 1 As shown, the liquid receiving tray 420 is connected to the second circulating liquid tank 600 through the water outlet pipe 423. When a water baffle cap 422 is provided, the liquid on the liquid receiving tray 420 can be discharged to the second circulating liquid tank 600 through the water outlet pipe 423 and the liquid's own weight, or it can be pumped and transported to the second circulating liquid tank 600.

[0068] It is understandable that a water-blocking cap 422 may not be installed above the connecting port 421, allowing some or all of the liquid sprayed by the third spray gun 412 to fall into the primary tower 430 for recycling, treatment, and circulation.

[0069] Specifically, the water-blocking cap 422 can be configured such that its top cover can block liquid from falling into the primary column 430 through the connecting port 421, but its side (located below the top cover) has a through hole, allowing gas to enter the secondary column 440 from the primary column 430 successively through the connecting port 421 and the through hole. The water-blocking cap 422 can also be configured in other suitable forms, as long as it can block liquid from falling into the primary column 430 through the connecting port 421 while ensuring aeration.

[0070] Furthermore, such as Figure 1 , 4 As shown, the outlet of the spray tower 400 is connected to an air outlet pipe 450. A condenser 451 and a first demister 452 are installed inside the air outlet pipe 450. The condenser 451 and the first demister 452 are arranged sequentially along the airflow direction. The air outlet pipe 450 has a water collection part 453 for receiving condensate. The water collection part 453 is connected to the second circulating liquid tank 600.

[0071] By incorporating a condenser 451, a water collection section 453, and a first demister 452, water vapor contained in the flue gas can be recovered to replenish the water consumed by the evaporation of the venturi tube 100, thereby achieving water recycling and reducing water consumption.

[0072] During operation, the treated waste gas is discharged through the outlet of the spray tower 400 and enters the outlet pipe 450. The waste gas moves along the outlet pipe 450 and is discharged through the outlet pipe 450. When the waste gas passes through the condenser 451, cooling circulating water is introduced into the condenser 451. The condenser 451 exchanges heat with the waste gas to reduce the temperature of the waste gas, causing the water vapor contained in the waste gas to condense and precipitate. Then the waste gas is discharged after being treated by the first demister 452. The condensate water after condensation in the condenser 451 is received by the water collection section 453 and recycled to the second circulating liquid tank 600 to replenish the water consumed by the evaporation of the venturi tube 100, realize the recycling of water and reduce water consumption.

[0073] Specifically, the exhaust pipe 450 includes a straight section, and the condenser 451 and the water collection part 453 are both disposed in the straight section. The straight section has a downwardly recessed recess, and the water collection part 453 is located in the recess.

[0074] Specifically, the condensate in the water collection section 453 can be discharged to the second circulating liquid tank 600 through pipes and the weight of the liquid, or it can be pumped and transported to the second circulating liquid tank 600.

[0075] Furthermore, such as Figure 4 As shown, the condenser 451 includes a condenser tube, and flushing pipes 454 are respectively provided on one side of the condenser 451 and one side of the first demister 452 to realize timed flushing and prevent blockage.

[0076] Specifically, flushing pipe 454 is connected to the workshop's production water source.

[0077] Furthermore, such as Figure 2 As shown, the secondary tower 440 is provided with a packing layer 441 and a second demister 442. The packing layer 441 is located between the third spray gun 412 and the liquid receiving tray 420. A backflush pipe 443 is provided between the second demister 442 and the third spray gun 412. The backflush pipe 443 can spray liquid to clean the second demister 442.

[0078] The filler layer 441 is provided to increase the residence time of the exhaust gas; the third spray gun 412 is provided to circulate and spray alkaline solution to effectively remove sulfur-containing substances from the flue gas; and the second demister 442 is provided to remove sulfuric acid mist and other particulate matter.

[0079] Specifically, the packing layer 441 being located between the third spray gun 412 and the liquid receiving tray 420 means that the packing layer 441 is higher than the liquid receiving tray 420, and the third spray gun 412 is higher than the packing layer 441.

[0080] Specifically, the height of the packing layer 441 is determined according to the design. The longer the required waste gas residence time, the higher the packing layer 441 should be. The material of the packing layer 441 is PP Pall rings.

[0081] Specifically, both the first demister 452 and the second demister 442 are wire mesh layers.

[0082] Furthermore, such as Figure 1 As shown, the cyclone dust collector 200 is a wet cyclone dust collector 200. The bottom of the cyclone dust collector 200 is connected to a dust collection device 230. The dust that settles in the cyclone dust collector 200 falls into the dust collection device 230 through an electric double-layer flap valve 260.

[0083] The dust collection device 230 is provided for easy dust collection; the settled dust falls into the dust collection device 230 through the electric double-layer flap valve 260, which has good air-locking performance.

[0084] Specifically, the dust collection device 230 is a dust storage container.

[0085] Furthermore, it also includes a high-temperature dust collector (not shown in the figure), through which the exhaust gas enters the venturi tube 100 for dust removal pretreatment; specifically, the high-temperature dust collector is a metal filter bag high-temperature dust collector.

[0086] Furthermore, one end of the Venturi tube 100 is higher than the other end of the Venturi tube 100; provided that the Venturi tube 100 can pre-treat the exhaust gas, other configuration methods can also be adopted for the configuration of one end of the Venturi tube 100 and the other end of the Venturi tube 100.

[0087] Furthermore, such as Figure 1As shown, a backwash pipe 443 is provided inside the secondary tower 440. The backwash pipe 443 is located between the second demister 442 and the third spray gun 412. The outlet of the backwash pipe 443 faces the second demister 442 to achieve timed flushing and prevent blockage.

[0088] like Figure 1 , 2 As shown in Figures 3 and 4, the first spray gun 110 and the third spray gun 412 share a third pump 403. When the high-temperature sulfur-containing waste gas treatment equipment is working:

[0089] After the high-temperature dust collector with metal filter bags pre-treats the exhaust gas, the exhaust gas containing sulfur at 300℃~400℃ is transported to the Venturi tube 100. The third pump 403 is started and pumps the liquid in the second circulating liquid tank 600 to the third pipe 401 and the fourth pipe 402. The first spray gun 110 and the third spray gun 412 spray the liquid. The liquid sprayed by the first spray gun 110 cools the exhaust gas and is also evaporated by the exhaust gas. The liquid sprayed by the third spray gun 412 falls onto the liquid receiving tray 420 and flows back to the second circulating liquid tank 600 through the water outlet pipe 423.

[0090] After being treated by the Venturi tube 100, the exhaust gas enters the cyclone dust collector 200 through the air inlet 210. The exhaust gas moves upward spirally in the cyclone dust collector 200. The particulate matter generated during spraying is removed by centrifugal force and falls into the ash collection device 230. The exhaust gas is also further desulfurized and cooled in the cyclone dust collector 200. The desulfurized and cooled exhaust gas enters the reverse spray pipe 300 through the air outlet 220.

[0091] The exhaust gas, cooled by the Venturi tube 100 and cyclone dust collector 200, is about 220°C. The exhaust gas moves downward along the reverse spray pipe 300. The first pump 480 starts, and the washing liquid in the first circulating liquid tank 431 is transported to the reverse nozzle 310 through the first pipe 460. The reverse nozzle 310 sprays the washing liquid upward to make reverse contact with the downward moving exhaust gas. The force of the exhaust gas will cause the washing liquid to splash in all directions. The turbulent film of the washing liquid wraps the dust and gaseous pollutants in the exhaust gas, which cools the exhaust gas suddenly and absorbs the acidic gas.

[0092] After contact, the liquid and treated waste gas enter the primary tower 430 through the other end of the reverse nozzle 300. Due to gravity, the liquid separates from the waste gas, the waste gas moves upward, and the liquid falls into the first circulating liquid tank 431. Then, the first pump 480 can circulate and deliver the washing liquid to the reverse nozzle 310. When the waste gas moves upward, the second pump 490 starts, and the liquid in the first circulating liquid tank 431 is delivered to the second spray gun 411 through the second pipe 470. The second spray gun 411 sprays the washing liquid downward to cool the waste gas and perform desulfurization pretreatment, reducing the load on the secondary tower 440. A heat exchanger 500 is installed in the first circulating liquid tank 431, which also exchanges heat with the washing liquid, further reducing the temperature of the waste gas.

[0093] The exhaust gas treated by the second spray gun 411 enters the secondary tower 440 through the connecting port 421. The exhaust gas passes through the packing layer 441, the third spray gun 412, and the second demister 442 in sequence. The packing layer 441 increases the residence time of the exhaust gas. The third spray gun 412 circulates and sprays liquid to effectively remove sulfur-containing substances from the flue gas. The second demister 442 removes sulfuric acid mist and other particulate matter.

[0094] The treated exhaust gas is discharged through the outlet of the spray tower 400 and enters the exhaust pipe 450. The exhaust gas moves along the exhaust pipe 450 and is discharged through the exhaust pipe 450. When the exhaust gas passes through the condenser 451, cooling circulating water is introduced into the condenser 451. The condenser 451 exchanges heat with the flue gas to reduce the temperature of the exhaust gas, causing the water vapor contained in the exhaust gas to condense and precipitate. Then the exhaust gas is discharged after being treated by the first demister 452. The condensate generated by the operation of the condenser 451 is received by the water collection part 453 and discharged to the second circulating liquid tank 600 through the pipeline to replenish the evaporation water consumption of the venturi tube 100, realize the recycling of water and reduce water consumption.

[0095] This invention allows waste gas to pass sequentially through a Venturi tube 100, a cyclone dust collector 200, and a reverse spray pipe 300 before entering the spray tower 400. This three-stage pretreatment ensures the waste gas is partially treated and cooled before entering the spray tower 400, guaranteeing it enters the tower at a suitable temperature and thus improving its processing efficiency. The first spray gun 110 of the Venturi tube 100 uses liquid from the secondary tower 440 to further cool the waste gas and also... High-salt wastewater is treated to evaporate; a heat exchanger 500 is installed in the first circulating liquid tank 431, which can exchange heat with the washing liquid and further reduce the temperature of the exhaust gas; the outlet of the spray tower 400 is connected to an exhaust pipe 450, which is equipped with a condenser 451 and a first demister 452, which can condense the condensate in the exhaust gas and transport it to the second circulating liquid tank 600 to replenish the evaporation water consumed by the venturi tube 100, realize water recycling, and reduce water consumption.

[0096] Although the technical solutions of this utility model have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these technical solutions without departing from the principles and spirit of this utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-temperature sulfur-containing exhaust gas treatment apparatus characterized by comprising: The application relates to a waste gas treatment device, which comprises the following components: a Venturi tube (100), wherein waste gas enters one end of the Venturi tube (100), and a first spray gun (110) for spraying liquid is arranged at the throat of the Venturi tube (100); a cyclone dust collector (200), wherein an air inlet (210) is arranged at the bottom of the sidewall of the cyclone dust collector (200), and an air outlet (220) is arranged at the top of the sidewall of the cyclone dust collector (200), and the air inlet (210) is connected with the other end of the Venturi tube (100); a reverse spray pipe (300), wherein one end of the reverse spray pipe (300) is connected with the air outlet (220), and a reverse spray head (310) for spraying liquid is arranged in the reverse spray pipe (300), and the spraying direction of the reverse spray head (310) is opposite to the airflow direction in the reverse spray pipe (300); a spray tower (400), wherein the inner cavity of the spray tower (400) is communicated with the other end of the reverse spray pipe (300), the outlet of the spray tower (400) is arranged at the top of the spray tower (400), and a spraying device (410) is arranged in the spray tower (400) between the other end of the reverse spray pipe (300) and the outlet.

2. The high temperature sulfur-containing off-gas treatment apparatus according to claim 1, characterized by: The spray tower (400) comprises a liquid receiving disc (420) connected with the inner wall of the spray tower (400), the spray tower (400) is divided into a primary tower (430) located at the lower side and a secondary tower (440) located at the upper side by the liquid receiving disc (420), the other end of the reverse spray pipe (300) is connected with the sidewall of the primary tower (430) and communicated with the inner cavity of the primary tower (430), and the outlet is arranged at the top of the secondary tower (440); the spraying device (410) comprises a second spray gun (411) arranged in the primary tower (430) and a third spray gun (412) arranged in the secondary tower (440), and the second spray gun (411) is located above the other end of the reverse spray pipe (300); a plurality of communication openings (421) are arranged on the liquid receiving disc (420) and communicated with the primary tower (430) and the secondary tower (440), and the airflow in the primary tower (430) can enter the secondary tower (440) through the communication openings (421).

3. The high temperature sulfur-containing off-gas treatment apparatus according to claim 2, characterized by: a first circulating liquid tank (431) is arranged in the primary tower (430), and the liquid in the first circulating liquid tank (431) can be pumped to the reverse spray head (310) and the second spray gun (411) through pipelines respectively; the first circulating liquid tank (431) is located below the other end of the reverse spray pipe (300) and the second spray gun (411), the reverse spray head (310) is arranged above the other end of the reverse spray pipe (300), the liquid sprayed by the reverse spray head (310) flows into the first circulating liquid tank (431) through the other end of the reverse spray pipe (300), and the liquid sprayed by the second spray gun (411) falls into the first circulating liquid tank (431).

4. The high temperature sulfur-containing off-gas treatment apparatus according to claim 3, characterized by: Further comprising a heat exchanger (500) arranged in the first circulating liquid tank (431), and circulating cooling water is introduced into the heat exchanger.

5. The high temperature sulfur-containing off-gas treatment apparatus according to claim 2, characterized by: Further comprising a second circulating liquid tank (600) arranged outside the spray tower (400); A water blocking cap (422) is arranged above each of the communication ports (421), and the water blocking cap (422) can block the liquid sprayed by the third spray gun (412) from falling to the primary tower (430) through the communication port (421), and the liquid receiving disc (420) can receive the liquid sprayed by the third spray gun (412) and can deliver the liquid to the second circulating liquid tank (600) through a pipeline. The liquid in the second circulating liquid tank (600) can be pumped to the first spray gun (110) and the third spray gun (412) through pipelines, respectively.

6. The high temperature sulfur-containing off-gas treatment apparatus according to claim 5, characterized by: An air outlet pipe (450) is connected to the outlet of the spray tower (400), a condenser (451) and a first mist eliminator (452) are arranged in the air outlet pipe (450), the condenser (451) and the first mist eliminator (452) are arranged in sequence along the airflow direction, and the air outlet pipe (450) has a water collecting part (453) for receiving condensed water, and the water collecting part (453) is communicated with the second circulating liquid tank (600).

7. The high temperature sulfur-containing off-gas treatment apparatus according to claim 6, characterized by: The condenser (451) comprises a condensing pipe, and a flushing pipe (454) is arranged on one side of the condenser (451) and one side of the first mist eliminator (452), respectively.

8. The high temperature sulfur-containing off-gas treatment apparatus according to claim 2, characterized by: A filler layer (441) and a second mist eliminator (442) are arranged in the secondary tower (440), the filler layer (441) is located between the third spray gun (412) and the liquid receiving disc (420), the second mist eliminator (442) is located above the third spray gun (412), a backflushing pipe (443) is arranged between the second mist eliminator (442) and the third spray gun (412), and the backflushing pipe (443) can spray liquid to clean the second mist eliminator (442).

9. The high temperature sulfur-containing off-gas treatment apparatus according to claim 1, characterized by: The cyclone dust collector (200) is a wet type cyclone dust collector (200), and a dust collecting device (230) is connected to the bottom of the cyclone dust collector (200), and the dust settled in the cyclone dust collector (200) falls into the dust collecting device (230) through an electric double-layer flap valve (260).

10. The high temperature sour off-gas treatment plant according to claim 1, characterized in that: Further comprising a high temperature dust collector, the waste gas passes through the high temperature dust collector and then enters the venturi (100), one end of the venturi (100) is higher than the other end of the venturi (100), the reverse spray head (310) adopts a large-diameter open spray head, and the diameter of the large-diameter open spray head ranges from 50 mm to 100 mm.

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