Waste gas purification device for LNG (Liquefied Natural Gas) emission

Abstract

The invention relates to the field of LNG waste gas purification, and discloses an LNG emission waste gas purification device which comprises a waste gas absorption purification tower, a waste gas absorption structure, an ammonia gas release structure and a fan, the waste gas absorption purification tower comprises a tower body, a flow guide plate is arranged at the bottom end in the tower body, and a solid particle interception mechanism is rotationally arranged at the bottom end of the flow guide plate; the solid particle intercepting mechanism comprises a rotating disc, a plurality of filtering pieces are arranged on the rotating disc, when the rotating disc rotates, the flow guide plate can drive the filtering pieces to turn over, and a cleaning device is arranged at the bottom end of the flow guide plate. After gas passes through, the turntable rotates to drive the filter plates to revolve, and waste gas is secondarily intercepted by the filter plate on the other side. Meanwhile, the filter plate rotates for one circle and turns over for 180 degrees, and is matched with a cleaning device for continuous cleaning, so that filter holes are prevented from being blocked, an efficient filtering state is always kept, and the problem that a fixed filter part is easy to block is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of LNG exhaust gas purification, in particular to a LNG exhaust gas purification device. BACKGROUND

[0002] LNG (liquefied natural gas) is a clean and efficient energy source, which is widely used in LNG transport ships, land storage tanks, filling stations, gas power plants and industrial kilns. During the storage, transportation and use of LNG, exhaust gas will be generated due to evaporation, leakage, etc. Its composition not only contains greenhouse gases such as methane, but also often contains nitrogen oxides (NO x ), sulfides and solid particles (such as dust, rust debris, etc.) formed by pipe wear and impurity deposition. If these exhaust gases are directly discharged, not only will it exacerbate air pollution, but also the solid particles may adhere to the equipment and affect the subsequent processing efficiency, so they need to be treated by a special purification device before being discharged.

[0003] The core purification methods of the existing LNG exhaust gas purification device mainly include: Solid particle pretreatment: solid particles in exhaust gas are intercepted by a filter assembly to prevent them from entering the subsequent reaction system and causing catalyst poisoning or equipment blockage; Nitrogen oxide removal: the selective catalytic reduction technology (SCR) is often used, that is, ammonia (NH3) is sprayed into the exhaust gas, and under the action of the catalyst, the nitrogen oxides and ammonia gas are reduced to generate harmless nitrogen (N2) and water (H2O); Water circulation purification: water washing is used to further remove soluble impurities and clean the inside of the filter assembly and tower body, while realizing the recycling of water resources.

[0004] However, in terms of solid particle treatment, the filter of the existing device is mostly a fixed installation filter screen or filter plate, which is easy to be clogged by solid particles after long-term use, resulting in a significant decrease in filtration efficiency. The treatment steps are usually as follows: exhaust gas passes through a fixed filter plate to intercept particles → manual disassembly of the filter plate after regular shutdown → high-pressure water gun washing or replacement of the filter plate → reinstallation of the cleaned filter plate → restart of the device. This process not only interrupts the purification operation, affecting continuity, but also is tedious and time-consuming for manual operation, increasing maintenance costs. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the above difficulties and provide a LNG exhaust gas purification device.

[0006] The utility model provides a kind of LNG exhaust gas emission purification device, including exhaust absorption purification tower, exhaust absorption structure, ammonia release structure and fan, exhaust absorption purification tower includes tower body, the bottom end of tower body is equipped with deflector, the bottom end of deflector is rotatably equipped with solid particle interception mechanism, solid particle interception mechanism includes rotating disc, rotating disc is equipped with several filter pieces that can intercept solid particles in exhaust gas, when rotating disc rotates, deflector can drive filter piece to overturn, the bottom end of deflector is equipped with cleaning device that can clean filter piece and simultaneously drive rotating disc to rotate.

[0007] As an improvement, the top end of the deflector is connected to the inner wall of the tower body, and the tower body is provided with an air inlet pipe near one end of the deflector. The deflector guides the exhaust gas sprayed from the air inlet pipe onto the solid particle interception mechanism and intercepts the solid particles through the filter pieces on the side close to the air inlet pipe.

[0008] As an improvement, the rotating disc is provided with a plurality of through grooves, and the filter pieces are located in the through grooves. The through grooves are provided with assembly holes at both ends. The filter pieces include filter plates that can move up and down and overturn in the through grooves by cooperating with the assembly holes. The top of one end of the filter plate and the bottom of the other end are both provided with arc-shaped tooth pieces. The arc-shaped tooth pieces are in the same direction as the rotating direction of the rotating disc. The contact position of the deflector and the arc-shaped tooth pieces is provided with a circular arc contact surface. The end of the circular arc contact surface is provided with a tooth plate engaged with the arc-shaped tooth pieces. When the arc-shaped tooth pieces contact the circular arc contact surface, the filter plate moves down. When the tooth plate contacts the arc-shaped tooth pieces, the filter plate overturns.

[0009] As an improvement, the assembly holes include round holes and slot holes. The filter plates are provided with runway-shaped blocks that can move up and down and rotate in the assembly holes. When the runway-shaped blocks are inserted into the slot holes, the filter plates can move up and down. The end of the runway-shaped blocks is rotatably provided with a sliding block. The sliding block is inserted with a sliding rod fixed in the assembly hole. The bottom end of the sliding block is provided with a spring sleeved outside the sliding rod.

[0010] As an improvement, the cleaning device includes a water pump, a water suction pipe, and two water outlet pipes. The tower body is provided with a water collection chamber isolated from the tower body. The water inlet of the water suction pipe is located in the water collection chamber. The two water outlet pipes are distributed on both sides of the deflector. Each of the two water outlet pipes is provided with a water outlet end head one with opposite water outlet directions and an inclined downward water outlet. The water sprayed from the water outlet end head one drives the rotating disc to rotate by impacting the arc-shaped tooth pieces and finally flows back into the tower body. In the process of rotating the rotating disc, the filter plate bottom and the filter hole are washed to remove the solid particles attached to them.

[0011] As an improvement, the tower body is provided with a solid particle collection piece corresponding to the bottom of the rotating disc. The solid particle collection piece includes a box body, a limiting plate, and an end cover. The bottom of the box body is provided with a filter screen that can intercept the solid particles washed down from the filter plate. The limiting plate is rotatably connected to the box body.

[0012] As improvement, the water in the tower body and the water collecting chamber is circulated by the cleaning device and the water circulating device, the water circulating device comprises corrugated pipe one and corrugated pipe two which are communicated with the tower body and the water collecting chamber respectively, the corrugated pipe one and the corrugated pipe two are communicated by a circulating pump, and the corrugated pipe one is provided with a water filtering element which can filter the water drawn from the tower body.

[0013] As improvement, the tower body is inserted with a waste gas exhaust pipeline at the bottom end, the waste gas exhaust pipeline is composed of a vertical section and a horizontal section, the vertical section is located in the tower body and passes through the waste gas absorption structure and the ammonia gas release structure at the same time, and the horizontal section is provided with a water pipe air cooling device which can air cool the corrugated pipe one and the corrugated pipe two and is communicated with a fan at the end.

[0014] Compared with the prior art, the present application has the following beneficial effects: 1. The double interception is realized by the solid particle interception mechanism: the waste gas is first guided by the deflector to the filter plate, the solid particles are intercepted by the filter plate, and then the waste gas is secondly intercepted by the other filter plate after the gas passes through, the filter plate revolves around the center under the rotation of the rotating disc, the filter plate is turned over by 180 degrees in one revolution, and the cleaning device continuously cleans to avoid the filter hole from being blocked, so that the high-efficiency filtering state is maintained, and the problem of easy blocking of the fixed filter element is solved.

[0015] 2. In the present application, the inclined water flow of the cleaning device not only washes the solid particles in the filter plate bottom and the filter hole, but also drives the rotating disc to rotate through the impact of the arc-shaped tooth element, so that the solid particles fall into the box body of the solid particle collecting element with the water flow. During cleaning, the box body can be directly drawn out, the opening of the box body is made downward by rotating the end cover, and the particles are quickly poured out, so that the problem of shutdown and complex operation in the traditional cleaning is solved, and continuous cleaning is realized.

[0016] 3. In the present application, the rotating air outlet element of the ammonia gas release structure is driven to rotate by the ammonia gas ejection reaction force and the waste gas flow, so that the ammonia gas is uniformly distributed in a spiral shape, is fully mixed with the waste gas, and then is subjected to twice catalytic reaction through the waste gas absorption structure, so that the problem of insufficient reaction caused by uneven distribution of ammonia gas in the traditional ammonia gas distribution is solved, and the purification continuity and efficiency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the overall structure schematic diagram of the LNG exhaust gas purification device.

[0018] Figure 2 It is the overall structure sectional view schematic diagram of the LNG exhaust gas purification device.

[0019] Figure 3 It is the overall structure split schematic diagram of the LNG exhaust gas purification device.

[0020] Figure 4It is a schematic view of the solid particle interception mechanism of the LNG exhaust gas emission purification device.

[0021] Figure 5 It is a schematic view of the solid particle collection mechanism of the LNG exhaust gas emission purification device.

[0022] Figure 6 It is a schematic view of the filter of the LNG exhaust gas emission purification device.

[0023] Figure 7 It is a schematic view of the exhaust gas absorption purification tower of the LNG exhaust gas emission purification device.

[0024] Figure 8 It is a schematic view of the ammonia gas release structure of the LNG exhaust gas emission purification device.

[0025] Figure 9 It is a schematic view of the water filter of the LNG exhaust gas emission purification device.

[0026] Figure 10 It is a schematic view of the exhaust gas absorption structure of the LNG exhaust gas emission purification device.

[0027] Figure 11 It is a schematic view of the Figure 3 enlarged view of A in the above figure.

[0028] As shown in the figure: 1, exhaust gas absorption purification tower; 101, tower body; 102, guide plate; 103, tooth plate; 104, water collection bin; 2, water pipe air cooling device; 3, exhaust gas discharge pipeline; 4, fan; 5, exhaust gas absorption structure; 501, sleeve; 502, gas absorption part one; 503, gas absorption part two; 6, ammonia gas release structure; 601, air sleeve; 602, rotating air outlet part; 7, solid particle interception mechanism; 701, rotating disc; 702, through slot; 703, assembly hole; 704, filter; 705, filter plate; 706, arc tooth part; 707, runway type matching block; 708, sliding block; 709, sliding rod; 710, spring; 8, cleaning device; 801, water pump; 802, water suction pipe; 803, water outlet pipe; 804, water outlet end one; 9, solid particle collection mechanism; 901, box body; 902, limiting plate; 903, end cover; 10, water circulation device; 1001, corrugated pipe one; 1002, corrugated pipe two; 1003, water filter; 1004, water inlet end; 1005, water outlet end two; 1006, filter cartridge; 1007, bottom cover. DETAILED DESCRIPTION

[0029] The application will be further described in detail below with reference to the accompanying drawings.

[0030] The application will be further described in detail below with reference to the accompanying drawings.Figure 1 , attached Figure 2 , attached Figure 3 , attached Figure 4 as shown: A LNG exhaust gas purification device, comprising exhaust gas absorption purification tower 1, exhaust gas absorption structure 5, ammonia release structure 6 and fan 4, exhaust gas absorption purification tower 1 comprises tower body 101, the bottom end of tower body 101 is provided with guide plate 102, the bottom end of guide plate 102 is rotatably provided with solid particle interception mechanism 7, solid particle interception mechanism 7 comprises rotating disc 701, a plurality of filter pieces 704 capable of intercepting solid particles in exhaust gas are arranged on rotating disc 701, when rotating disc 701 rotates, guide plate 102 can drive filter piece 704 to overturn, the bottom end of guide plate 102 is provided with cleaning device 8 capable of cleaning filter piece 704 and simultaneously driving rotating disc 701 to rotate, solid particle collecting piece 9 located at the bottom of rotating disc 701 is inserted on tower body 101, exhaust gas discharge pipeline 3 is inserted at the bottom end of tower body 101, water pipe air cooling device 2 is provided on exhaust gas discharge pipeline 3, and water circulation device 10 is communicated on tower body 101.

[0031] The working principle of the present application is as follows: when exhaust gas enters tower body 101, guide plate 102 guides the exhaust gas, when the exhaust gas is guided to filter piece 704 on solid particle interception mechanism 7, filter piece 704 can intercept solid particles in the exhaust gas, and the gas can pass through, cleaning device 8 sprays filtered water to filter piece 704 to remove solid particles adhered to the bottom of filter piece 704 and the filter holes, the solid particles fall into solid particle collecting piece 9 along with the water flow and are collected by solid particle collecting piece 9, the inclined water flow sprayed by cleaning device 8 can drive rotating disc 701 to rotate through filter piece 704, when rotating disc 701 rotates, when filter piece 704 moves to the bottom of guide plate 102, guide plate 102 can drive filter piece 704 to overturn, at this time, the solid particles on filter piece 704 are located at the bottom of filter piece 704, at this time, cleaning device 8 can spray the solid particles, water circulation device 10 can pump out and filter the water at the bottom of tower body 101, and at the same time, water pipe air cooling device 2 can cool the pumped-out water to avoid damage to the water pump caused by long-term conveying of high-temperature water, ammonia release structure 6 is prior art, ammonia gas is sprayed to react with nitrogen oxides in LNG exhaust gas, for example: 4NH3+4NO+O2→4N2+6H2O, exhaust gas absorption structure 5 is prior art, mainly as a catalyst for the reduction reaction of ammonia gas and nitrogen oxides in LNG exhaust gas, the material is, for example, V2O5-WO3 / TiO2.

[0032] combined with attached Figure 1 , attached Figure 2 , attached Figure 3 , attached Figure 4 , attached Figure 6 , attached Figure 7 as shown: The top end of the flow guide plate 102 is connected with the inner wall of the tower body 101, the tower body 101 is provided with an air inlet pipe near one end of the flow guide plate 102, the flow guide plate 102 guides the exhaust gas sprayed by the air inlet pipe to the solid particle interception mechanism 7 and intercepts the solid particles through the filter piece 704 near the air inlet pipe side; The rotating disc 701 is provided with a plurality of through grooves 702, the filter piece 704 is located in the through groove 702, the through groove 702 is provided with an assembly hole 703 at both ends, the filter piece 704 comprises a filter plate 705 which can move up and down and turn in the through groove 702 by cooperating with the assembly hole 703, the filter plate 705 is provided with an arc-shaped tooth piece 706 at the top of one end and the bottom of the other end, the arc-shaped tooth piece 706 is in the same direction as the rotating direction of the rotating disc 701, the flow guide plate 102 is provided with a circular arc contact surface at the contact position of the arc-shaped tooth piece 706, the end of the circular arc contact surface is provided with a tooth plate 103 which is engaged with the arc-shaped tooth piece 706, when the arc-shaped tooth piece 706 contacts the circular arc contact surface, the filter plate 705 moves downward, when the tooth plate 103 contacts the arc-shaped tooth piece 706, the filter plate 705 turns over; The assembly hole 703 comprises a circular hole and a slot hole, the filter plate 705 is provided with a runway-shaped matching block 707 which can move up and down and rotate in the assembly hole 703 at both ends, when the runway-shaped matching block 707 is inserted into the slot hole, the filter plate 705 can move up and down, the end of the runway-shaped matching block 707 is rotatably provided with a sliding block 708, the sliding block 708 is provided with a sliding rod 709 which is fixedly connected with the assembly hole 703, the bottom end of the sliding block 708 is provided with a spring 710 which is sleeved on the sliding rod 709.

[0033] The working principle of the solid particle interception mechanism 7 is as follows: when the exhaust gas is guided by the flow guide plate 102 to the filter plate 705, the filter plate 705 can intercept the solid particles existing in the exhaust gas, which is the first interception, the exhaust gas passing through the filter plate 705 on one side of the flow guide plate 102 enters the bottom of the rotating disc 701, then the exhaust gas passes through the filter plate 705 on the other side from bottom to top, and the solid particles in the exhaust gas are continuously intercepted by the filter plate 705 on the other side, so that the content of the solid particles in the exhaust gas is greatly reduced, and the situation that the exhaust gas is blocked in the subsequent treatment process is effectively avoided; When the exhaust gas passes through the filter plate 705, the solid particles are generally attached to the end face which is first contacted by the exhaust gas and the filter plate 705, that is, the exhaust gas guided by the flow guide plate 102 and passing through the filter plate 705, at this time, the solid particles are attached to the upper end face of the filter plate 705 and the filter hole, and when passing through the filter plate 705 on the other side, the solid particles are attached to the lower end face of the filter plate 705 and the filter hole, in the present application, the tooth plate 103 is in the position as shown in the accompanying Figure 3 When the exhaust gas passes through the filter plate 705, the solid particles are generally attached to the end face which is first contacted by the exhaust gas and the filter plate 705, that is, the exhaust gas guided by the flow guide plate 102 and passing through the filter plate 705, at this time, the solid particles are attached to the upper end face of the filter plate 705 and the filter hole, and when passing through the filter plate 705 on the other side, the solid particles are attached to the lower end face of the filter plate 705 and the filter hole, in the present application, the tooth plate 103 is in the position as shown in the accompanying Figure 2 ​As shown, when the arc-shaped tooth piece 706 is in contact with the circular arc contact surface, the arc-shaped tooth piece 706 is lowered under the action of the circular arc contact surface due to the height difference between the arc-shaped tooth piece 706 and the circular arc contact surface, and the degree of lowering is that the runway-shaped fitting block 707 is separated from the slot hole and moves into the circular hole, at this time, the runway-shaped fitting block 707 can rotate in the circular hole and the spring 710 is in a compressed state, when the arc-shaped tooth piece 706 passes through the circular arc contact surface and is in contact with the tooth plate 103, the arc-shaped tooth piece 706 rolls on the tooth plate 103 under the cooperation of the rolling engagement, at this time, the filter plate 705 is turned over, the connection between the circular hole and the slot hole in the assembly hole 703 in the present application is provided with a round corner, that is, at the moment when the arc-shaped tooth piece 706 rolls and is separated from the tooth plate 103, the filter plate 705 is in an incomplete turning over state, that is, in an inclined state, and the circular end surface of the runway-shaped fitting block 707 is in a non-contact state with the connection between the circular hole and the slot hole, at this time, the runway-shaped fitting block 707 is quickly moved up to the connection between the circular hole and the slot hole under the action of the spring 710 and slides, that is, the runway-shaped fitting block 707 moves up along the connection between the circular hole and the slot hole and continues to turn over, until the runway-shaped fitting block 707 moves up to be inserted into the slot hole, at this time, the filter plate 705 is turned over by 180 degrees, that is, turned over to the position. The filter plate 705 is turned over by 180 degrees in one revolution and cooperates with the cleaning device 8 to continuously filter solid particles in the exhaust gas and clean the solid particles attached to the filter plate 705, so that the filtering efficiency of the exhaust gas can be continuously maintained.

[0034] The drawings are combined Figure 1 , the drawings are combined Figure 2 , the drawings are combined Figure 3 , the drawings are combined Figure 4 , the drawings are combined Figure 6 , the drawings are combined Figure 7 , the drawings are combined Figure 11 As shown: The cleaning device 8 comprises a water suction pump 801, a water suction pipe 802 and two water outlet pipes 803, the tower body 101 is provided with a water collecting chamber 104 which is isolated from the tower body 101, the water inlet of the water suction pipe 802 is located in the water collecting chamber 104, the two water outlet pipes 803 are distributed on the two sides of the flow guide plate 102, the two water outlet pipes 803 are respectively provided with water outlet end heads 804 which are opposite in water outlet direction and have inclined downward water outlets, the water sprayed by the water outlet end heads 804 drives the rotating disc 701 to rotate by impacting the arc-shaped tooth piece 706 and finally flows back into the tower body 101, and the solid particles attached to the bottom of the filter plate 705 and the filter hole are washed in the process of rotation of the rotating disc 701.

[0035] In order to prevent the filtering effect of the filter plate 705 from being reduced due to clogging during the filtering process, the present application is correspondingly provided with two water outlet pipes 803, which can alternately clean the front and back surfaces of the filter plate 705 when the filter plate 705 revolves and turns over, and the specific process is as follows: When the cleaning device 8 starts working, the filter plate 705 continuously revolves when the exhaust gas passes through the filter plate 705, and when the exhaust gas passes through the bottom of the filter plate 705, the water outlet pipe 803 on the side can flush away the solid particles on the bottom of the filter plate 705, and when the filter plate 705 first flips, the water outlet pipe 803 on the other side can flush away the solid particles intercepted by the exhaust gas passing through the filter plate 705 last time. Since the filter plate 705 revolves one turn at a time, the actual cleaning object when the exhaust gas passes through one end face of the filter plate 705 is the solid particles intercepted by the exhaust gas passing through one end face of the filter plate 705 last time, that is, the solid particles attached to the filter plate 705 will be flushed twice after the filter plate 705 revolves one turn; Since the two water outlet pipes 803 are respectively provided with water outlet end heads 804 with opposite water outlet directions and inclined downward, at this time the water output by the water outlet end heads 804 drives the rotating disc 701 to rotate through the impact arc-shaped tooth pieces 706, and flushes the filter plate 705 while the rotating disc 701 rotates.

[0036] As shown in the accompanying drawings: Figure 1 , the accompanying drawings: Figure 2 , the accompanying drawings: Figure 3 , the accompanying drawings: Figure 5 , the accompanying drawings: Figure 6 , the accompanying drawings: Figure 7 As shown in the accompanying drawings: The solid particle collecting piece 9 includes a box body 901, a limiting plate 902, and an end cover 903. The box body 901 is provided with a filter screen at the bottom, which can intercept the solid particles flushed down from the filter plate 705, and the limiting plate 902 is rotationally connected to the box body 901 in an arc shape with a diameter equal to the inner wall diameter of the tower body 101.

[0037] The specific operation process of the solid particle collecting piece 9 is as follows: the box body 901 mainly collects the solid particles flushed down from the filter plate 705 by the water flow. When it is necessary to clean the solid particles in the box body 901, the worker manually pulls the box body 901 outward through the end cover 903 until the limiting plate 902 is in close contact with the inner wall of the tower body 101. At this time, in order to avoid exhaust gas leakage, the worker still needs to continuously pull the box body 901 to make the limiting plate 902 continuously and closely contact with the tower body 101. Then, while pulling outward, the worker rotates the end cover 903 to make the opening of the box body 901 face downward. At this time, the worker can clean the solid particles by knocking or cleaning. After cleaning, the worker rotates the end cover 903 to make the opening of the box body 901 face upward, and then quickly pushes the end cover 903 to make the box body 901 return to the original position. Finally, the worker fixes the end cover 903 on the tower body 101 by bolts or other locking tools. The process of handling the solid particles is fast and convenient.

[0038] As shown in the accompanying drawings: Figure 1 , the accompanying drawings: Figure 2 , the accompanying drawings: Figure 3 , the accompanying drawings: Figure 7 , the accompanying drawings: Figure 8, attached Figure 9 , attached Figure 10 as shown: The tower body 101 and the water inside the water collecting chamber 104 are circulated by the cleaning device 8 and the water circulating device 10, and the water circulating device 10 includes corrugated pipe one 1001 and corrugated pipe two 1002 which are respectively connected with the tower body 101 and the water collecting chamber 104, and the corrugated pipe one 1001 and the corrugated pipe two 1002 are connected by a circulating pump, and the corrugated pipe one 1001 is provided with a water filtering element 1003 which can filter the water drawn from the tower body 101; The water filtering element 1003 includes a water inlet end 1004 and a water outlet end two 1005, the water outlet end two 1005 is located in the water inlet end 1004 and the water outlet end passes through the water inlet end 1004, the bottom of the water outlet end two 1005 is provided with a filter cartridge 1006, and the bottom of the water inlet end 1004 is provided with a bottom cover 1007 which is sleeved outside the filter cartridge 1006, the water enters the bottom cover 1007 from the water inlet end of the water inlet end 1004 and is output from the water outlet end two 1005 through the filter cartridge 1006, and the filter cartridge 1006 can intercept the solid particles in the water during the process; The waste gas discharge pipeline 3 is composed of a vertical section and a horizontal section, the vertical section is located in the tower body 101 and passes through the waste gas absorption structure 5 and the ammonia gas release structure 6 at the same time, and the horizontal section is provided with a water pipe air cooling device 2 which can air cool the corrugated pipe one 1001 and the corrugated pipe two 1002 and is connected with the fan 4 at the end.

[0039] The main function of the water circulating device 10 is to transport the water in the tower body 101 to the water collecting chamber 104, and the solid particles in the water are filtered by the water filtering element 1003 during the process and are transported to the water collecting chamber 104 by the circulating pump; The waste gas absorption structure 5 includes upper and lower distribution sleeve shells 501, and the two sleeve shells 501 are respectively inserted with a plurality of gas absorption elements one 502 and gas absorption elements two 503, the gas absorption elements one 502 are provided in a mesh shape, and the gas absorption elements two 503 are provided in a groove shape and can place spherical catalysts inside.

[0040] The waste gas absorption structure 5 is a prior art, mainly as a catalyst for the reduction reaction of nitrogen oxides in ammonia gas and LNG waste gas, and the material is V2O5-WO3 / TiO2, etc., when the nitrogen oxides and ammonia gas pass through the spherical catalysts in turn after mixing, the nitrogen oxides and ammonia gas can have a first chemical reaction, and when the mixed gas passes through the spherical catalysts, due to the irregular arrangement of a plurality of spherical catalysts, the nitrogen oxides and ammonia gas can be mixed more fully in the reaction process, and when the mixed gas passes through the mesh-shaped gas absorption elements one 502, a second chemical reaction can occur, and since the mixing of nitrogen oxides and ammonia gas is more sufficient at this time, the chemical reaction of the remaining nitrogen oxides and ammonia gas is more sufficient and thorough.

[0041] The ammonia releasing structure 6 comprises a ventilation sleeve 601 sleeved on the exhaust gas discharge pipeline 3, and rotating communication rotating gas outlets 602 are arranged on the upper and lower ends of the ventilation sleeve 601, wherein the rotating gas outlets 602 comprise a plurality of inclined rectangular gas outlets, and the ammonia gas ejection direction of the gas outlets on the rectangular gas outlets is opposite to the rotating direction of the rotating gas outlets 602.

[0042] When the ammonia gas is released, the ammonia gas is output from the gas outlets on the rectangular gas outlets of the rotating gas outlets 602 through the ventilation sleeve 601, and since the ammonia gas ejection direction of the gas outlets on the rectangular gas outlets is opposite to the rotating direction of the rotating gas outlets 602, at this time, the ammonia gas output from the gas outlets can provide a rotating force for the rotating gas outlets 602 under the relative force, and meanwhile, the exhaust gas flow can also provide a rotating force for the rotating gas outlets 602 in the process of flowing on the exhaust gas, and under the action of the two forces, the rotating gas outlets 602 can rotate and output the ammonia gas in the rotating process, and the ammonia gas moves upward under the action of the exhaust gas flow, that is, the state of the single gas outlet continuously outputting the ammonia gas is in a spiral shape, and in the state of the multiple gas outlets simultaneously outputting the ammonia gas, the ammonia gas distribution in the tower body 101 has the beneficial effects that the ammonia gas output is more uniform and is more easily mixed with the exhaust gas compared with the fixed ammonia gas output in the prior art.

[0043] In the specific implementation of the present application, the LNG exhaust gas enters the tower body 101 through the gas inlet pipe, is guided by the guide plate 102 to the filter plate 705 of the solid particle interception mechanism 7, the solid particles in the exhaust gas are intercepted by the filter plate 705, and the gas passes through; the cleaning device 8 is started to draw water from the water collecting bin 104, and the inclined water flow is sprayed through the water outlet end head one 804 of the two water outlet pipes 803, the water flow impacts the arc-shaped tooth piece 706 to drive the rotating disc 701 to rotate, and at the same time, the water flow washes the solid particles in the bottom of the filter plate 705 and in the filter hole, the solid particles fall into the box body 901 of the solid particle collecting mechanism 9 along with the water flow, are intercepted and collected by the filter screen at the bottom of the box body 901, and finally, the water flow returns to the tower body 101; in the rotating process of the rotating disc 701, the arc-shaped tooth piece 706 of the filter plate 705 moves downward under the contact of the circular arc contact surface of the guide plate 102, and then meshes with the tooth plate 103 to realize overturning, so that the adhered solid particles are diverted to the bottom for easy cleaning, and after overturning, the arc-shaped tooth piece 706 is reset under the action of the spring 710; the water circulating device 10 draws the water at the bottom of the tower body 101 out, filters the water through the water filtering piece 1003, and then conveys the water to the water collecting bin 104, the water pipe air cooling device 2 blows and cools the corrugated pipe; the ammonia releasing structure 6 outputs the ammonia gas and uniformly distributes the ammonia gas in a spiral shape, the nitrogen oxides in the exhaust gas react under the action of the catalyst, the exhaust gas after the final purification is discharged through the exhaust gas discharge pipeline 3 by the fan 4, the solid particle collecting mechanism 9 can be drawn out through the end cover 903 for cleaning, and the whole process realizes efficient interception and cleaning of the solid particles in the exhaust gas, full mixing reaction of the ammonia gas and the exhaust gas, and stable operation of the water circulation.

[0044] The above describes the present application and its embodiments, which are not limited, and the drawings only show one of the embodiments of the present application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired thereby, without departing from the spirit of the present application, without creating a similar structure and embodiment of the technical solution, which should belong to the protection scope of the present application.

Claims

1. A LNG exhaust gas purification device, comprising an exhaust gas absorption purification tower (1), an exhaust gas absorption structure (5), an ammonia gas release structure (6) and a fan (4), characterized in that: The waste gas absorption purification tower (1) comprises a tower body (101), a guide plate (102) is arranged at the bottom end of the tower body (101), a solid particle interception mechanism (7) is rotatably arranged at the bottom end of the guide plate (102), the solid particle interception mechanism (7) comprises a rotating disc (701), a plurality of filter pieces (704) capable of intercepting solid particles in waste gas are arranged on the rotating disc (701), when the rotating disc (701) rotates, the guide plate (102) can drive the filter pieces (704) to overturn, and the bottom end of the guide plate (102) is provided with a cleaning device (8) capable of cleaning the filter pieces (704) and driving the rotating disc (701) to rotate.

2. The LNG exhaust gas purification device according to claim 1, wherein: The top end of the guide plate (102) is connected with the inner wall of the tower body (101), an air inlet pipe is arranged at one end of the tower body (101) close to the guide plate (102), and the guide plate (102) guides the waste gas sprayed from the air inlet pipe to the solid particle interception mechanism (7) and intercepts the solid particles through the filter pieces (704) on the side close to the air inlet pipe.

3. The LNG exhaust gas purification device according to claim 1, wherein: A plurality of through grooves (702) are arranged on the rotating disc (701), the filter pieces (704) are located in the through grooves (702), assembly holes (703) are arranged at the two ends of the through grooves (702), the filter pieces (704) comprise filter plates (705) capable of moving up and down and overturning in the through grooves (702) through cooperation with the assembly holes (703), arc-shaped tooth pieces (706) are arranged at one end top and the other end bottom of the filter plates (705), the arc-shaped tooth pieces (706) are arranged in the same direction as the rotating direction of the rotating disc (701), a circular arc contact surface is arranged at the contact position of the guide plate (102) and the arc-shaped tooth pieces (706), a tooth plate (103) is arranged at the end of the circular arc contact surface and engaged with the arc-shaped tooth pieces (706), the filter plates (705) move downward when the arc-shaped tooth pieces (706) contact the circular arc contact surface, and the filter plates (705) overturn when the tooth plate (103) contacts the arc-shaped tooth pieces (706).

4. The LNG exhaust gas purification device according to claim 3, wherein: The assembly holes (703) comprise round holes and slot holes, racetrack-shaped cooperation blocks (707) capable of moving up and down and rotating in the assembly holes (703) are arranged at the two ends of the filter plates (705), the filter plates (705) can move up and down when the racetrack-shaped cooperation blocks (707) are inserted into the slot holes, sliding blocks (708) are rotatably arranged at the ends of the racetrack-shaped cooperation blocks (707), sliding rods (709) fixedly arranged in the assembly holes (703) are inserted through the sliding blocks (708), and springs (710) are arranged around the sliding rods (709) at the bottom ends of the sliding blocks (708).

5. The LNG exhaust gas purification device according to claim 4, wherein: The cleaning device (8) comprises a water pump (801), a water suction pipe (802) and two water outlet pipes (803), the tower body (101) is internally provided with a water collecting bin (104) which is isolated from the tower body (101), the water inlet of the water suction pipe (802) is located in the water collecting bin (104), the two water outlet pipes (803) are distributed on the two sides of the guide plate (102), the two water outlet pipes (803) are respectively provided with water outlet end heads (804) which are opposite in water outlet direction and inclined downward, the water sprayed by the water outlet end heads (804) drives the rotating disc (701) to rotate by impacting the arc-shaped toothed piece (706) and finally flows back to the tower body (101), and the solid particles attached to the bottom of the filter plate (705) and the filter hole are washed in the process of rotation of the rotating disc (701).

6. The LNG exhaust gas purification device according to claim 3, wherein: The tower body (101) is correspondingly inserted with a solid particle collecting piece (9) located at the bottom of the rotating disc (701), the solid particle collecting piece (9) comprises a box body (901), a limiting plate (902) and an end cover (903), the bottom of the box body (901) is provided with a filter screen which can intercept the solid particles washed down from the filter plate (705), and the limiting plate (902) is rotationally connected with the box body (901).

7. The LNG exhaust gas purification device according to claim 5, wherein: The water in the tower body (101) and the water collecting bin (104) is circulated by the cleaning device (8) and a water circulation device (10), the water circulation device (10) comprises corrugated pipes (1001) and (1002) which are respectively communicated with the tower body (101) and the water collecting bin (104), the corrugated pipes (1001) and (1002) are communicated by a circulating pump, and the corrugated pipe (1001) is provided with a water filtering piece (1003) which can filter the water pumped out from the tower body (101).

8. The LNG exhaust gas purification device according to claim 7, wherein: The bottom end of the tower body (101) is inserted with an exhaust gas discharge pipeline (3), the exhaust gas discharge pipeline (3) is composed of a vertical section and a horizontal section, the vertical section is located in the tower body (101) and simultaneously penetrates the exhaust gas absorption structure (5) and the ammonia gas release structure (6), the horizontal section is provided with a water pipe air cooling device (2) which can air cool the corrugated pipes (1001) and (1002) and is communicated with a fan (4) at the end.

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