A recovery pretreatment structure for coke oven tail gas treatment

Abstract

The present invention discloses a recovery and pretreatment structure applied to the treatment of coke oven tail gas, comprising a spray tower, a supporting base is arranged at the bottom of the spray tower, a water flooding guide is arranged inside the spray tower, a coke condensation and separation tower is arranged at the top of the spray tower, a plurality of scraper frames are sleeved on the top of the water flooding guide, and a filter ring is arranged at the bottom of the water flooding guide; the present invention realizes primary, deep and tertiary treatment through designs such as arc grooves, spray mist discs, condensation spiral rings, etc., ensures the tail gas purification quality layer by layer, effectively separates tar and extracts and recovers it with the help of oil pipelines, thereby improving economic benefits and environmental protection value; it also uses the flue gas pressure to drive the impeller to rotate, drives the related components to work together, reduces energy consumption, and is equipped with a spare motor to switch modes as needed, flexibly adapts to working conditions, ensures stable operation of equipment, and reduces costs.

Description

Technical Field

[0001] The invention relates to the technical field of coke oven tail gas treatment, in particular to a recovery pretreatment structure applied to coke oven tail gas treatment. Background Art

[0002] At present, due to the increase in flue gas volume, accompanied by the increase in the service life of coke ovens and the decline in the use capacity of coke ovens, the total amount of coke oven flue gas has increased year by year, and has exceeded the maximum flue gas volume designed to withstand the device. At the same time, with the access of desulfurization waste liquid, VOCS and other media to the coke oven flue gas for combustion treatment, not only the flue gas volume has increased significantly, but the concentration of pollutants has also increased exponentially, resulting in serious lack of processing capacity of traditional environmental protection equipment, overload operation of equipment such as induced draft fans and filter tube reactors, which brings great risks and safety hazards to the normal production of coke ovens, and has a great impact on the normal production of coke ovens.

[0003] In conjunction with the above content, it should be noted that: Announcement No. A Chinese patent discloses a device for recovering and treating tail gas from a coke oven gas purification device, which is to centrally recover and utilize the toxic and harmful tail gas discharged from each storage tank in the gas purification area under closed conditions. However, there is a lack of linkage treatment for the recovered and stored gas, and combined with continuous production, the tail gas is continuously collected and accumulated, making it difficult to treat.

[0004] In view of the above technical defects, a solution is now proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a recovery pretreatment structure applied to coke oven tail gas treatment to solve the proposed problem.

[0006] To achieve the above object, the present invention provides the following technical solution: a recovery pretreatment structure applied to coke oven tail gas treatment, comprising a spray tower, a support base is arranged at the bottom of the spray tower, a water flooding guide frame is arranged inside the spray tower, a coking separation tower is arranged at the top of the spray tower, a plurality of scraper frames are sleeved on the top of the water flooding guide frame, and a filter ring is arranged at the bottom of the water flooding guide frame;

[0007] A cooling tower is arranged on the top of the coke separation tower, a double-driven top frame is arranged on the top of the cooling tower, a spray mist disk facing the inside of the spray tower is arranged at the bottom of the coke separation tower, and a condensation spiral ring facing the inside of the coke separation tower is arranged inside the cooling tower.

[0008] Furthermore, an inner cone is provided in the middle of the inner wall of the spray tower, a suction pipe valve penetrating the spray tower is provided above the inner cone, and a plurality of smoke pipes penetrating the spray tower are provided at the bottom of the inner cone.

[0009] Furthermore, a top supporting ring attached to the bottom of the inner cone is provided on the top of the flooding guide frame, a limiting groove for slidingly sleeved with the scraper is recessed on the inner wall of the flooding guide frame, and the top of the scraper frame cooperates with the inner cone and the bottom wall of the top supporting ring to slide.

[0010] Furthermore, a support tube connected to a support base is provided at the bottom of the flood guide frame, a middle shaft sleeve connected to a scraper frame is provided at the top of the support tube, an outer wall of the support tube below the middle shaft sleeve is connected to a filter ring, and a drain valve is provided through the inner wall of the support base.

[0011] Furthermore, a flow guide hood is provided at the top edge of the coke separation tower, an oil collecting trough is provided in the central depression on the top of the coke separation tower, an oil discharge ring pipe is provided at the outer periphery of the coke separation tower, a plurality of branch pipes penetrating the coke separation tower and extending to the oil collecting trough are provided on the inner wall of the oil discharge ring pipe, and a flue gas duct connecting the flow guide hood and the spray tower is provided on the outer side of the coke separation tower.

[0012] Furthermore, a plurality of rings connected to the coking separation tower are arranged in the middle of the spray mist disk, a slide embedded in the bottom wall of the coking separation tower is arranged at the top edge of the spray mist disk, and a water pipe penetrating the coking separation tower and extending outward is arranged at the top of the spray mist disk through a slip ring.

[0013] Furthermore, a connecting plate is provided on the inner wall of the top of the cooling tower barrel, a cold medium pipe valve penetrating the cooling tower barrel is provided on the top of the connecting plate, and the bottom of the cold medium pipe valve is connected to the condensation spiral ring, a cold medium pipe valve penetrating the coking separation tower barrel and extending outward is provided at the bottom of the condensation spiral ring, and an air vent connected to the inside of the double-drive top frame is provided on the edge of the connecting plate.

[0014] Furthermore, an impeller is sleeved inside the double-driven top frame, a transmission shaft penetrating the cooling tower, the coking separation tower and the spray tower is arranged in the middle of the impeller, and a plurality of sets of shaft sleeves are arranged on the surface of the transmission shaft, a backup motor is arranged on the top of the double-driven top frame, and a smoke exhaust port is arranged on the frame of the double-driven top frame away from the air vent.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention uses a unique arc groove design to inject and squeeze spray water into the flue gas, so that the flue gas is aerated and rolled in the spray water, adhering to and mixing with impurities, and is initially purified; the secondary treatment is to spray water lines through a rotating spray mist disk to flush flue gas impurities, break bubbles and create water mist, and cooperate with a demister to intercept the water mist to deeply purify the flue gas; the tertiary treatment relies on a condensing spiral ring to cool the tar to liquefy and collect it, and each link is progressive and complementary to ensure the quality of tail gas purification.

[0017] 2. The present invention can effectively separate the tar components and use the oil pipeline composed of an oil discharge ring pipe and supporting pipe fittings to regularly extract tar from the oil collecting tank and transport it to external oil extraction equipment, thereby realizing the recovery and reuse of tar resources and improving the economic benefits and environmental value of coke oven tail gas treatment.

[0018] 3. The present invention utilizes the flue gas's own pressure to drive the impeller to rotate, and drives the transmission shaft, spray mist disk and scraper frame in turn through the coupling to construct a linkage mechanism and reduce additional power consumption; at the same time, it is equipped with a spare motor, which can be switched to active rotation mode as needed to achieve negative pressure extraction and active mixing, flexibly adapt to different working conditions, ensure stable and continuous operation of the equipment, and reduce operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the spray tower of the present invention;

[0022] Figure 3 It is a schematic diagram of the connection structure of the water flooding guide frame, the spray tower and the support base of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the water flooding guide frame of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the coking separation tower of the present invention;

[0025] Figure 6 It is a schematic diagram of the connection structure between the coking separation tower and the spray mist disk of the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the cooling tower of the present invention;

[0027] Figure 8 It is a schematic diagram of the internal structure of the cooling tower tube of the present invention.

[0028] Figure numerals: 1. spray tower; 101. inner cone; 2. cooling tower; 201. connecting plate; 202. air vent; 203. condensation spiral ring; 3. supporting base; 4. coking separation tower; 401. guide cover; 402. oil collecting tank; 403. oil discharge ring pipe; 5. double drive top frame; 501. spare motor; 502. impeller; 503. transmission shaft; 6. water flooding guide frame; 601. scraper frame; 602. top support ring; 603. middle shaft sleeve; 604. support cylinder; 605. filter ring; 7. spray mist disk; 701. slide frame. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figure 1 - Figure 8 As shown, this embodiment is a recovery pretreatment structure applied to coke oven tail gas treatment, comprising a spray tower 1, a support base 3 is arranged at the bottom of the spray tower 1, a water flooding guide frame 6 is arranged inside the spray tower 1, a coking separation tower 4 is arranged at the top of the spray tower 1, a plurality of scraper frames 601 are sleeved on the top of the water flooding guide frame 6, and a filter ring 605 is arranged at the bottom of the water flooding guide frame 6.

[0031] The tail gas generated by the coke oven during continuous operation is collected and treated with waste heat to obtain low-temperature flue gas. The flue gas is connected to the flue pipe on the recovery pretreatment equipment through the pipeline of the relevant equipment, and the flue gas is forced to enter the spray tower 1 along the flue pipe. The flue gas is first concentrated along the flue pipe and sprayed into the arc groove between the top support ring 602, the inner cone 101 and the spray tower 1.

[0032] After the flue gas is continuously injected, the spray water inside the arc groove is squeezed, part of it rises along the middle ring mouth of the inner cone disk 101, and part of the flue gas rises along the ring mouth simultaneously, causing the flue gas to be aerated and rolled inside the spray water, some impurities directly adhere to the bottom wall of the inner cone disk 101, and some impurities are mixed into the spray water, thereby realizing the initial treatment of the flue gas.

[0033] A plurality of rings connected to the coking separation tower 4 are arranged in the middle of the spray mist disc 7, a slide 701 embedded in the bottom wall of the coking separation tower 4 is arranged on the top edge of the spray mist disc 7, a water pipe penetrating the coking separation tower 4 and extending outward is arranged on the top of the spray mist disc 7 through a slip ring, and the flue gas treated by aeration and rising enters between the inner cone disc 101 and the spray mist disc 7, and a connecting ring and a water slip ring are arranged on the ring at the top of the spray mist disc 7, which are sleeved with the transmission shaft 503 through the connecting ring, and the spray mist disc 7 is connected to the bottom wall of the coking separation tower 4 on the slide 701;

[0034] Driven by the rotation of the transmission shaft 503, the spray mist disk 7 is caused to rotate on the top of the spray tower 1, and the water slip ring is connected to the outer periphery of the connecting ring. A water pipe is arranged on the top of the water slip ring, which penetrates the coking separation tower 4 and the spray tower 1 and is connected to the water supply equipment. A plurality of groups of injection ports are arranged on the bottom surface of the spray mist disk 7, and a branch pipe connecting the injection port and the water slip ring is arranged inside the spray mist disk 7, thereby guiding water to be vertically pressurized and sprayed toward the inner cone 101 through the injection port, so that most of the impurities in the flue gas are contacted by the water line and flushed into the spray water collected inside the spray tower 1.

[0035] At the same time, the blast of the water line causes the aerated flue gas bubbles to burst quickly, and produces continuously splashing water droplets, further subjecting the newly exploded flue gas to multiple covering water immersion treatments. In this process, part of the water line contacts the spray tower 1 and the inner wall of the inner cone 101 to produce water mist, which diffuses inside the spray tower 1, and a plurality of groups of demisters are arranged inside the flue gas flow to intercept the water mist in the flue gas and realize secondary treatment of the water mist.

[0036] A support tube 604 connected to the support base 3 is provided at the bottom of the flood guide frame 6, and a central shaft sleeve 603 sleeved with the scraper 601 is provided on the top of the support tube 604. The outer wall of the support tube 604 below the central shaft sleeve 603 is sleeved with the filter ring 605. A drain valve is provided through the inner wall of the support base 3. The spray water is collected in the bottom area of ​​the spray tower 1. Most of the impurities are affected by the continuous upwelling of flue gas aeration and the erosion of water line jets and gathered at the top of the inner cone 101. It is connected to the pipeline flange of the external wastewater treatment equipment through the suction pipe valve, and then the spray water gathered on the surface of the inner cone 101 is regularly extracted. At the same time, the drain valve at the bottom of the support base 3 is connected to the pipeline flange of the external wastewater treatment equipment, and the spray water is regularly extracted.

[0037] An inner cone 101 is arranged in the middle of the inner wall of the spray tower 1 , a suction pipe valve penetrating the spray tower 1 is arranged above the inner cone 101 , and a plurality of smoke pipes penetrating the spray tower 1 are arranged at the bottom of the inner cone 101 .

[0038] A top supporting ring 602 attached to the bottom of the inner cone 101 is provided on the top of the flooding guide frame 6, and a limiting groove for slidingly sleeved with the scraper 601 is recessed on the inner wall of the flooding guide frame 6, and the top of the scraper 601 cooperates with the inner cone 101 and the bottom wall of the top supporting ring 602 to slide.

[0039] A flow guide hood 401 is arranged at the top edge of the coke separation tower 4, an oil collecting tank 402 is arranged in a depression at the center of the top of the coke separation tower 4, an oil discharge ring pipe 403 is arranged at the outer periphery of the coke separation tower 4, and a plurality of branch pipes penetrating the coke separation tower 4 and extending to the inside of the oil collecting tank 402 are arranged on the inner wall of the oil discharge ring pipe 403, and a flue gas duct connecting the flow guide hood 401 and the spray tower 1 is arranged on the outer side of the coke separation tower 4.

[0040] The flue gas collected at the top of the spray tower 1 is pushed by the flue gas continuously injected subsequently, and is pressurized along the flow flue to enter the guide hood 401, and flows along the inner wall of the guide hood 401, and finally blows into the oil collecting tank 402, so that the flue gas that initially enters the coking separation tower 4 is gathered and contacted, and is synchronously guided by multiple groups of flow flues, so that the gathered flue gas is caused to explode upward after contact, and then contact with multiple groups of condensation spiral rings 203, and the tar component in the flue gas is cooled and liquefied, and flows downstream along the surface of the condensation spiral ring 203 until it is collected in the oil collecting tank 402. An oil pipeline connected to the external oil pumping equipment is arranged on the outside of the oil discharge ring pipe 403. Under the suction generated by the operation of the external oil pumping equipment, the tar gathered in the oil collecting tank 402 is regularly extracted, so that the tar enters the external oil pumping equipment along the branch pipe, the oil discharge ring pipe 403, and the oil pipeline, and the above-mentioned pipes are connected by flanges to form an oil pipeline.

[0041] Embodiment 2: This embodiment is a recovery pretreatment structure applied to the treatment of coke oven tail gas, comprising a cooling tower 2 disposed on the top of a coke condensation separation tower 4, a double-drive top frame 5 disposed on the top of the cooling tower 2, a spray mist disk 7 facing the inside of the spray tower 1 disposed at the bottom of the coke condensation separation tower 4, and a condensation spiral ring 203 facing the inside of the coke condensation separation tower 4 disposed inside the cooling tower 2;

[0042] The spray water collection area is connected to the external wastewater treatment equipment through the suction pipe valve and the bottom drain valve. The flange connection is used to facilitate the regular extraction of wastewater and cleaning of impurities. The installation direction and spiral angle of key components such as the condensation spiral ring 203 can be flexibly adjusted as needed, which is conducive to equipment maintenance and parameter optimization, extending the service life of the equipment and ensuring the overall exhaust gas treatment process to operate efficiently, stably and durably.

[0043] A connection plate 201 is provided on the inner wall of the top of the cooling tower 2. A cold medium pipe valve penetrating the cooling tower 2 is provided on the top of the connection plate 201. The bottom of the cold medium pipe valve is connected to the condensation spiral ring 203. A cold medium pipe valve penetrating the coking separation tower 4 and extending outward is provided at the bottom of the condensation spiral ring 203. An air vent 202 communicating with the inside of the double-drive top frame 5 is provided at the edge of the connection plate 201.

[0044] The top of the condensing spiral ring 203 is connected to the pipeline flange of the external cooling medium storage equipment through the upper and lower cold medium pipe valves to form a cold medium transmission line. The condensing spiral ring 203 is a spiral metal pipe. The spiral angle and installation direction are adjusted according to actual needs and are not limited to those shown in the drawings. The flue gas treated by the condensing spiral ring 203 is collected at the top of the cooling tower 2 and enters the double-drive top frame 5 along the vent 202, forming three treatments of the flue gas.

[0045] An impeller 502 is sleeved inside the double-drive top frame 5, a transmission shaft 503 penetrating the cooling tower 2, the coking separation tower 4 and the spray tower 1 is arranged in the middle of the impeller 502, and a plurality of sets of shaft sleeves are arranged on the surface of the transmission shaft 503, a spare motor 501 is arranged on the top of the double-drive top frame 5, and a smoke exhaust port is arranged on the frame body of the double-drive top frame 5 away from the air leakage port 202;

[0046] When the smoke enters the double-driven top frame 5 along the air vent 202, the pressure between some blades of the impeller 502 is rapidly increased. Affected by the size of the opening between the impeller 502 and the air vent 202 and the structure of the blades, the impeller 502 is driven to rotate under the pressure of the continuous injection of smoke until the smoke between the blades is discharged out along the smoke exhaust port. The shape of the impeller 502 and the size of the opening between the impeller 502 and the air vent 202 are adjusted according to actual production needs and are not limited to those shown in the drawings. The smoke enters the next step along the smoke exhaust port and completes the preliminary treatment process of the smoke.

[0047] At the same time, the flue gas is used to drive the impeller 502 to rotate. The impeller 502 drives the transmission shaft 503 to rotate through the coupling. The transmission shaft 503 drives the spray mist disk 7 and the scraper 601 to rotate through related accessories, forming a linkage process in the flue gas treatment process. According to actual needs, the standby motor 501 drives the transmission shaft 503 and the impeller 502 to actively rotate through the coupling and other related accessories, forming a negative pressure extraction and active mixing operation process.

[0048] Combining Example 1 and Example 2, it can be seen that the present invention has many advantages in treating coke oven exhaust gas: first, through the design of arc grooves, spray mist disk 7, condensation spiral ring 203, etc., primary, deep and tertiary treatments are achieved, and the exhaust gas purification quality is guaranteed layer by layer; second, tar is effectively separated and extracted and recovered with the help of oil pipelines, thereby improving economic benefits and environmental protection value; third, the flue gas pressure is used to drive the impeller 502 to rotate, driving the linkage of related components to reduce energy consumption, and the spare motor 501 is equipped to switch modes as needed, flexibly adapt to working conditions, ensure stable operation of equipment, and reduce costs.

[0049] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A recovery pretreatment structure for coke oven tail gas treatment, comprising a spray tower (1), characterized in that: A support base (3) is provided at the bottom of the spray tower (1), a water flooding guide frame (6) is provided inside the spray tower (1), a coking separation tower (4) is provided at the top of the spray tower (1), a plurality of scraper frames (601) are sleeved on the top of the water flooding guide frame (6), and a filter ring (605) is provided at the bottom of the water flooding guide frame (6); A cooling tower (2) is arranged on the top of the coke separation tower (4); a double-drive top frame (5) is arranged on the top of the cooling tower (2); a spray mist disk (7) facing the inside of the spray tower (1) is arranged on the bottom of the coke separation tower (4); and a condensing spiral ring (203) facing the inside of the coke separation tower (4) is arranged inside the cooling tower (2); An inner cone (101) is provided in the middle of the inner wall of the spray tower (1), a suction pipe valve penetrating the spray tower (1) is provided above the inner cone (101), and a plurality of smoke pipes penetrating the spray tower (1) are provided at the bottom of the inner cone (101); The top of the water flooding guide frame (6) is provided with a supporting ring (602) attached to the bottom of the inner cone (101); a limiting groove for slidingly sleeved with the scraper frame (601) is recessed on the inner wall of the water flooding guide frame (6); and the top of the scraper frame (601) is in contact with and slides with the inner cone (101) and the bottom wall of the supporting ring (602); The bottom of the water flooding guide frame (6) is provided with a support cylinder (604) connected to the support base (3); the top of the support cylinder (604) is provided with a middle shaft sleeve (603) sleeved with the scraper frame (601); the outer wall of the support cylinder (604) below the middle shaft sleeve (603) is sleeved with a filter ring (605); and a drainage valve is provided through the inner wall of the support base (3); An impeller (502) is sleeved inside the double-drive top frame (5), and a transmission shaft (503) is provided in the middle of the impeller (502) and passes through the cooling tower (2), the coking separation tower (4) and the spray tower (1).

2. A recovery pretreatment structure for coke oven tail gas treatment according to claim 1, characterized in that: The top edge of the coke separation tower (4) is provided with a flow guide hood (401), the top center of the coke separation tower (4) is recessed with an oil collecting trough (402), the outer periphery of the coke separation tower (4) is provided with an oil drain ring pipe (403), the inner wall of the oil drain ring pipe (403) is provided with a plurality of branch pipes penetrating the coke separation tower (4) and extending to the inside of the oil collecting trough (402), and the outer side of the coke separation tower (4) is provided with a flue gas duct connecting the flow guide hood (401) and the spray tower (1).

3. A recovery pretreatment structure for coke oven tail gas treatment according to claim 2, characterized in that: A plurality of groups of rings connected to the coking separation tower (4) are arranged in the middle of the spray mist disc (7), and a slide (701) embedded in the bottom wall of the coking separation tower (4) is arranged at the top edge of the spray mist disc (7).

4. The recovery pretreatment structure for coke oven tail gas treatment according to claim 1, characterized in that: A connecting plate (201) is arranged on the inner wall of the top of the cooling tower barrel (2); a cold medium pipe valve penetrating the cooling tower barrel (2) is arranged on the top of the connecting plate (201); the bottom of the cold medium pipe valve is connected to the condensation spiral ring (203); a cold medium pipe valve penetrating the coking separation tower barrel (4) and extending outward is arranged on the bottom of the condensation spiral ring (203); and an air vent (202) communicating with the inside of the double-drive top frame (5) is arranged on the edge of the connecting plate (201).

5. A recovery pretreatment structure for coke oven tail gas treatment according to claim 4, characterized in that: A plurality of sets of shaft sleeves are arranged on the surface of the transmission shaft (503), a spare motor (501) is arranged on the top of the double-drive top frame (5), and a smoke exhaust port is arranged on the frame body of the double-drive top frame (5) on the side away from the air leakage port (202).

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