A LNG exhaust gas purification device

Abstract

The present application relates to the field of LNG exhaust gas purification, and discloses a LNG exhaust gas purification device, which comprises an exhaust gas absorption purification tower, an exhaust gas absorption structure, an ammonia gas release structure and a fan, wherein the exhaust gas absorption purification tower comprises a tower body, a guide plate is arranged at the bottom end of the tower body, a solid particle interception mechanism is rotatably arranged at the bottom end of the guide plate, the solid particle interception mechanism comprises a rotating disc, a plurality of filter elements are arranged on the rotating disc, the guide plate can drive the filter elements to overturn when the rotating disc rotates, and a cleaning device is arranged at the bottom end of the guide plate. The present application realizes double interception through the solid particle interception mechanism: when the exhaust gas is first guided by the guide plate to the filter plate, the filter plate intercepts the solid particles; after the gas passes through, the rotating disc rotates to drive the filter plate to revolve, and the exhaust gas is secondarily intercepted by the filter plate on the other side. At the same time, the filter plate revolves 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 that the fixed filter element is prone to be blocked 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:

[0004] 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;

[0005] 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);

[0006] Water circulation purification: water washing is used to further remove soluble impurities and clean the inside of the filter assembly and the tower body, while realizing the recycling of water resources.

[0007] 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

[0008] The technical problem to be solved by the present application is to overcome the above difficulties and provide a LNG exhaust gas purification device.

[0009] 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 guide plate, the bottom end of guide plate 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, guide plate can drive filter piece overturn, the bottom end of guide plate is equipped with cleaning device that can clean filter piece and simultaneously drive rotating disc rotation.

[0010] As an improvement, the top end of the guide plate is connected to the inner wall of the tower body, and an air inlet pipe is arranged near one end of the tower body close to the guide plate. The guide plate 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.

[0011] 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 guide plate 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 downward. When the tooth plate contacts the arc-shaped tooth pieces, the filter plate overturns.

[0012] 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 at both ends. 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 block 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.

[0013] As an improvement, the cleaning device includes a water pump, a water suction pipe, and two water outlet pipes. A water collection chamber isolated from the tower body is arranged in 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 guide plate. 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 therein.

[0014] As an improvement, the tower body is correspondingly inserted with a solid particle collection piece located at 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 with the box body.

[0015] 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.

[0016] As improvement, the tower body is inserted with a waste gas discharging pipeline at the bottom end, the waste gas discharging 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 absorbing structure and the ammonia gas releasing 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.

[0017] The beneficial effects of the present application compared with the prior art are:

[0018] 1. The solid particle interception mechanism realizes double interception: the waste gas is first guided by the deflector to the filter plate, the filter plate intercepts the solid particles, and after the gas passes through, the filter plate revolves with the rotation of the rotating disc, and the waste gas is intercepted by the other filter plate for the second time. At the same time, the filter plate revolves for one revolution and turns over by 180 degrees, and cooperates with the cleaning device to continuously clean, so as to avoid the filter hole from being blocked, always maintain an efficient filtering state, and solve the problem that the fixed filter element is easy to block.

[0019] 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. When cleaning, the box body can be directly drawn out, the box body opening is made downward by rotating the end cover, and the particles are quickly poured out, without the need to stop the machine, solving the problem of complex operation and the need to stop the machine for traditional cleaning, and realizing continuous cleaning.

[0020] 3. In the present application, the rotating air outlet element of the ammonia gas releasing 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, fully mixed with the waste gas, and after two catalytic reactions of the waste gas absorbing structure, 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

[0021] Figure 1 It is the overall structure schematic diagram of the LNG exhaust gas purification device.

[0022] Figure 2 It is the overall structure sectional view schematic diagram of the LNG exhaust gas purification device.

[0023] Figure 3 It is the overall structure split schematic diagram of the LNG exhaust gas purification device.

[0024] Figure 4It is a solid particle interception mechanism schematic diagram for the LNG exhaust emission purification device of the present application.

[0025] Figure 5 It is a solid particle collection piece schematic diagram for the LNG exhaust emission purification device of the present application.

[0026] Figure 6 It is a filter piece schematic diagram for the LNG exhaust emission purification device of the present application.

[0027] Figure 7 It is a waste gas absorption purification tower schematic diagram for the LNG exhaust emission purification device of the present application.

[0028] Figure 8 It is an ammonia gas release structure schematic diagram for the LNG exhaust emission purification device of the present application.

[0029] Figure 9 It is a water filtering piece schematic diagram for the LNG exhaust emission purification device of the present application.

[0030] Figure 10 It is a waste gas absorption structure schematic diagram for the LNG exhaust emission purification device of the present application.

[0031] Figure 11 It is a waste gas absorption structure schematic diagram for the LNG exhaust emission purification device of the present application. Figure 3 The enlarged view of A in the above figure.

[0032] As shown in the figure: 1, waste gas absorption purification tower; 101, tower body; 102, guide plate; 103, tooth plate; 104, water collecting bin; 2, water pipe air cooling device; 3, waste gas discharge pipeline; 4, fan; 5, waste gas absorption structure; 501, sleeve; 502, gas absorption piece one; 503, gas absorption piece two; 6, ammonia gas release structure; 601, air sleeve; 602, rotating air outlet piece; 7, solid particle interception mechanism; 701, rotating disc; 702, through slot; 703, assembly hole; 704, filter piece; 705, filter plate; 706, arc-shaped tooth piece; 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 piece; 901, box body; 902, limiting plate; 903, end cover; 10, water circulation device; 1001, corrugated pipe one; 1002, corrugated pipe two; 1003, water filtering piece; 1004, water inlet end; 1005, water outlet end two; 1006, filter cartridge; 1007, bottom cover. DETAILED DESCRIPTION

[0033] The present application will be further described in detail below with reference to the accompanying drawings.

[0034] The present 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:

[0035] A kind of LNG exhaust gas purification device for exhaust gas absorption purification tower 1, exhaust gas absorption structure 5, ammonia release structure 6 and fan 4, exhaust gas absorption purification tower 1 includes tower body 101, the bottom end of tower body 101 is equipped with guide plate 102, the bottom end of guide plate 102 is rotatably equipped with solid particle interception mechanism 7, solid particle interception mechanism 7 includes rotating disc 701, rotating disc 701 is provided with several filter pieces 704 that can intercept solid particles in exhaust gas, when rotating disc 701 rotates, guide plate 102 can drive filter piece 704 to overturn, the bottom end of guide plate 102 is equipped with cleaning device 8 that can clean filter piece 704 and simultaneously drive rotating disc 701 to rotate, the bottom of rotating disc 701 is inserted with solid particle collection piece 9 in tower body 101, the bottom end of tower body 101 is inserted with exhaust gas discharge pipeline 3, exhaust gas discharge pipeline 3 is equipped with water pipe air cooling device 2, and tower body 101 is communicated with water circulation device 10.

[0036] 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 attached to the bottom of filter piece 704 and the filter holes, the solid particles fall into solid particle collection piece 9 with the water flow and are collected by solid particle collection piece 9, the inclined water flow sprayed by cleaning device 8 can drive rotating disc 701 to rotate by 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 due to long-term transportation of high-temperature water, ammonia release structure 6 is prior art, which sprays ammonia to react with nitrogen oxides in LNG exhaust gas, for example: 4NH3+4NO+O2→4N2+6H2O, exhaust gas absorption structure 5 is prior art, which mainly acts as a catalyst for the reduction reaction of ammonia and nitrogen oxides in LNG exhaust gas, and the material is, for example, V2O5-WO3 / TiO2.

[0037] combined with attached Figure 1 , attached Figure 2 , attached Figure 3 , attached Figure 4 , attached Figure 6 , attached Figure 7As shown:

[0038] 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;

[0039] 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 contact position of the flow guide plate 102 and the arc-shaped tooth piece 706 is provided with a circular arc contact surface, 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;

[0040] The assembly hole 703 comprises a round 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 provided with a sliding block 708, the sliding block 708 is provided with a sliding rod 709 which is fixed in 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.

[0041] 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 of blockage in the subsequent exhaust gas treatment process is effectively avoided;

[0042] 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, when passing through the filter plate 705 on the other side, at this time, 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 state as shown in the attached Figure 3At the position shown in the middle, the bottom end of the other side flow guide plate 102 is only provided with a circular arc contact surface capable of extruding the lower movement of the filter element 704, that is, the filter plate 705 rotates one time per one rotation, and the specific overturning process is as follows:

[0043] As shown in the accompanying drawings, Figure 2 When the arc-shaped tooth element 706 contacts the circular arc contact surface, the arc-shaped tooth element 706 is extruded by the circular arc contact surface due to the height difference between the two, so that the arc-shaped tooth element 706 drives the filter plate 705 to move downward, and the degree of downward movement is that the runway-shaped fitting block 707 is separated from the slot hole and moves to 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 element 706 passes through the circular arc contact surface and contacts the tooth plate 103, the arc-shaped tooth element 706 and the tooth plate 103 are in rolling engagement, so that the arc-shaped tooth element 706 can roll on the tooth plate 103, at this time, the filter plate 705 is overturned, 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 element 706 rolls and is separated from the tooth plate 103, the filter plate 705 is in an incomplete overturning 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 upward to contact the connection between the circular hole and the slot hole and slide under the action of the spring 710, that is, the runway-shaped fitting block 707 moves upward along the connection between the circular hole and the slot hole and continues to overturn, until the runway-shaped fitting block 707 moves upward to be inserted into the slot hole, at this time, the filter plate 705 is overturned by 180 degrees, that is, overturned to the position;

[0044] The filter plate 705 rotates one time per one revolution and overturns by 180 degrees, and the cleaning device 8 can continuously filter solid particles in the exhaust gas, and at the same time, the cleaning device 8 can continuously clean the solid particles attached to the filter plate 705, so as to continuously maintain the filtering efficiency of the exhaust gas.

[0045] As shown in the accompanying drawings, Figure 1 , the accompanying drawings, Figure 2 , the accompanying drawings, Figure 3 , the accompanying drawings, Figure 4 , the accompanying drawings, Figure 6 , the accompanying drawings, Figure 7 , the accompanying drawings, Figure 11 As shown in the accompanying drawings,

[0046] The cleaning device 8 includes a water pump 801, a water pumping pipe 802, and two water outlet pipes 803. A water collection chamber 104 isolated from the tower body 101 is provided inside the tower body 101. The water inlet of the water pumping pipe 802 is located inside the water collection chamber 104. The two water outlet pipes 803 are distributed on both sides of the guide plate 102. The two water outlet pipes 803 are respectively provided with water outlet heads 804 with opposite water outlet directions and downward tilted outlets. The water sprayed from the water outlet head 804 drives the turntable 701 to rotate through the impact arc-shaped toothed member 706 and finally flows back into the tower body 101. During the rotation of the turntable 701, the solid particles attached to the bottom of the filter plate 705 and the filter holes are washed.

[0047] To ensure that the filtration efficiency of the filter plate 705 does not decrease due to clogging during the filtration process, this invention provides two water outlet pipes 803. As the filter plate 705 revolves and flips, the two water outlet pipes 803 alternately clean the front and back surfaces of the filter plate 705. The specific process is as follows:

[0048] During initial operation, the cleaning device 8 starts working. When the exhaust gas passes through the filter plate 705, the filter plate 705 continues to rotate. When the exhaust gas passes through the bottom of the filter plate 705, the water outlet pipe 803 on that side can flush away the solid particles at the bottom of the filter plate 705. When the filter plate 705 flips over for the first time, the water outlet pipe 803 on the other side can clean and flush away the solid particles that were intercepted by the exhaust gas that passed through the filter plate 705 last time. Since the filter plate 705 flips once for one revolution, the actual cleaning object when the exhaust gas passes through one end face of the filter plate 705 is the solid particles that were intercepted when the exhaust gas passed through one end face of the filter plate 705 last time. That is, the solid particles attached to the filter plate 705 will be washed twice after the filter plate 705 rotates once.

[0049] Since the two water outlet pipes 803 are respectively equipped with water outlet heads 804 with opposite water outlet directions and downward tilted water outlets, the water output from the water outlet head 804 drives the turntable 701 to rotate through the impact arc-shaped toothed member 706, and washes the filter plate 705 while the turntable 701 is rotating.

[0050] Combined with appendix Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 5 Appendix Figure 6 Appendix Figure 7 As shown:

[0051] The solid particle collector 9 includes a box body 901, a limiting plate 902, and an end cap 903. The bottom of the box body 901 is equipped with a filter screen, which can intercept solid particles rushing down from the filter plate 705. The limiting plate 902 is rotatably connected to the box body 901 in an arc shape and its diameter is equal to the inner wall diameter of the tower body 101.

[0052] The specific operation process of the solid particle collector 9 is as follows: The box 901 mainly collects solid particles washed down by the water flow from the filter plate 705. When it is necessary to clean the solid particles in the box 901, the staff manually pulls the box 901 outward quickly through the end cap 903 until the limiting plate 902 is in contact with the inner wall of the tower body 101. At this time, in order to avoid the leakage of exhaust gas, it is still necessary to continue to pull the box 901 to keep the limiting plate 902 in close contact with the tower body 101. Then, while pulling outward, rotate the end cap 903 so that the opening of the box 901 faces downward. At this time, the solid particles can be cleaned by tapping or washing. After cleaning, rotate the end cap 903 so that the opening of the box 901 faces upward. Then, quickly push the end cap 903 to return the box 901 to its original position. Finally, the end cap 903 is fixed to the tower body 101 with bolts or other locking tools. The solid particles are processed quickly and conveniently during the process.

[0053] Combined with appendix Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 7 Appendix Figure 8 Appendix Figure 9 Appendix Figure 10 As shown:

[0054] The water inside the tower body 101 and the water collection tank 104 is circulated through the cleaning device 8 and the water circulation device 10. The water circulation device 10 includes a corrugated pipe 1001 and a corrugated pipe 1002 that are respectively connected to the tower body 101 and the water collection tank 104. The corrugated pipe 1001 and the corrugated pipe 1002 are connected by a circulation pump. The corrugated pipe 1001 is provided with a water filter element 1003 that can filter the water drawn out from the tower body 101.

[0055] The water filter element 1003 includes an inlet end 1004 and an outlet end 1005. The outlet end 1005 is located inside the inlet end 1004 and the outlet end passes through the inlet end 1004. A filter cartridge 1006 is provided at the bottom of the outlet end 1005. A bottom cover 1007 is provided at the bottom of the inlet end 1004 and is fitted over the filter cartridge 1006. Water enters the bottom cover 1007 from the inlet end of the inlet end 1004 and is output from the outlet end 1005 through the filter cartridge 1006. During the process, the filter cartridge 1006 can intercept solid particles in the water.

[0056] The exhaust gas discharge pipe 3 consists of a vertical section and a horizontal section. The vertical section is located inside the tower body 101 and passes through the exhaust gas absorption structure 5 and the ammonia release structure 6. The horizontal section is equipped with a water pipe cooling device 2 that can cool the corrugated pipe 1001 and the corrugated pipe 2002, and its end is connected to the fan 4.

[0057] The water circulating device 10 mainly functions to transport the water in the tower body 101 to the water collecting bin 104, and in the process, the solid particles in the water are filtered by the water filtering element 1003 and transported to the water collecting bin 104 by the circulating pump;

[0058] The exhaust gas absorption structure 5 comprises upper and lower distribution of the sleeve 501, two sleeve 501 are respectively inserted with a plurality of gas absorption piece one 502 and gas absorption piece two 503, the gas absorption piece one 502 is meshed, the gas absorption piece two 503 is grooved and the inside can place the spherical catalyst.

[0059] The exhaust gas absorption structure 5 is prior art, mainly as ammonia and LNG exhaust gas nitrogen oxides reduction reaction catalyst, material such as V2O5-WO3 / TiO2, when nitrogen oxides and ammonia gas mixed through the spherical catalyst, nitrogen oxides and ammonia gas can occur first chemical reaction, and mixed gas through the spherical catalyst, due to the irregular arrangement of a plurality of spherical catalyst, nitrogen oxides and ammonia gas can be mixed more fully in the process of reaction, when mixed gas through the meshed gas absorption piece one 502, can occur second chemical reaction, due to the mixing of nitrogen oxides and ammonia gas is more fully, then the remaining nitrogen oxides and ammonia gas chemical reaction is more fully thorough.

[0060] The ammonia gas release structure 6 comprises a ventilation sleeve 601 sleeved on the exhaust gas discharge pipeline 3, the upper and lower ends of the ventilation sleeve 601 are rotatably connected with the rotating gas outlet piece 602, the rotating gas outlet piece 602 comprises a plurality of inclined rectangular gas outlet pipes, and the ammonia gas outlet direction of the gas outlet of the rectangular gas outlet pipe is opposite to the rotating direction of the rotating gas outlet piece 602.

[0061] When releasing ammonia gas, the ammonia gas is output from the gas outlet of the rectangular gas outlet pipe on the rotating gas outlet piece 602 by the ventilation sleeve 601, and since the ammonia gas outlet direction of the gas outlet of the rectangular gas outlet pipe is opposite to the rotating direction of the rotating gas outlet piece 602, the ammonia gas output from the gas outlet can provide a rotating force for the rotating gas outlet piece 602 under the relative force, and in the process of flowing on the exhaust gas, the exhaust gas flow also provides a rotating force for the rotating gas outlet piece 602, and under the action of the two forces, the rotating gas outlet piece 602 can rotate and output 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 ammonia gas is in a spiral shape, and under the state of the plurality of gas outlets simultaneously outputting ammonia gas, the distribution of the ammonia gas in the tower body 101 is more uniform than that in the prior art, and the ammonia gas is more easily mixed with the exhaust gas.

[0062] In the specific implementation of the present application, the LNG exhaust gas enters through the gas inlet pipe on the tower body 101, is guided by the flow guide plate 102 to the filter plate 705 of the solid particle interception mechanism 7, the filter plate 705 intercepts the solid particles in the exhaust gas, and the gas passes through; the cleaning device 8 is started to draw water from the water collecting chamber 104, and the water is sprayed out 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 at 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 with the water flow, and are intercepted and collected by the filter screen at the bottom of the box body 901, and the water flow finally returns to the tower body 101; during the rotation of the rotating disc 701, the arc-shaped tooth piece 706 of the filter plate 705 moves under the contact of the circular arc contact surface of the flow guide plate 102, and then meshes with the toothed plate 103 to realize overturning, so that the adhered solid particles are turned 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 out the water at the bottom of the tower body 101, filters the water through the water filtering mechanism 1003, and then conveys the water to the water collecting chamber 104, the water pipe air cooling device 2 blows air to cool the corrugated pipe; the ammonia gas releasing structure 6 outputs ammonia gas and uniformly distributes the ammonia gas in a spiral shape, and the nitrogen oxides in the exhaust gas are reduced under the action of the catalyst, and finally the purified exhaust gas is discharged through the exhaust gas discharge pipe 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.

[0063] 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 purpose of the present application, without creating a similar structure and embodiment, which should belong to the protection scope of the present application.

Claims

1. A device for purifying LNG exhaust gas, comprising an exhaust gas absorption and purification tower (1), an exhaust gas absorption structure (5), an ammonia release structure (6), and a fan (4), characterized in that: The exhaust gas absorption and purification tower (1) includes a tower body (101). A guide plate (102) is provided at the bottom of the tower body (101). A solid particle interception mechanism (7) is rotatably provided at the bottom of the guide plate (102). The solid particle interception mechanism (7) includes a turntable (701). Several filter elements (704) capable of intercepting solid particles in the exhaust gas are provided on the turntable (701). When the turntable (701) rotates, the guide plate (102) can drive the filter elements (704) to flip. A cleaning device (8) is provided at the bottom of the guide plate (102) to clean the filter elements (704) and drive the turntable (701) to rotate at the same time. A number of through slots (702) are provided on the turntable (701). The filter element (704) is located in the through slot (702). Assembly holes (703) are provided at both ends of the through slot (702). The filter element (704) includes a filter plate (705) that can move up and down and flip in the through slot (702) by cooperating with the assembly hole (703). The top of one end of the filter plate (705) and the bottom of the other end are provided with arc-shaped teeth (706). The arc-shaped teeth (706) face the same direction as the turntable (701). A circular arc contact surface is provided at the contact point between the guide plate (102) and the arc-shaped teeth (706). The end of the circular arc contact surface is provided with a toothed plate (103) that meshes with the arc-shaped teeth (706). When the arc-shaped teeth (706) contacts the circular arc contact surface, the filter plate (705) moves down. When the toothed plate (103) contacts the arc-shaped teeth (706), the filter plate (705) flips. The assembly hole (703) includes a round hole and a slot. The filter plate (705) has racetrack-shaped mating blocks (707) at both ends that can move up and down and rotate within the assembly hole (703). When the racetrack-shaped mating block (707) is inserted into the slot, the filter plate (705) can move up and down. The end of the racetrack-shaped mating block (707) is provided with a slider (708) that rotates. A slide rod (709) fixed in the assembly hole (703) is inserted through the slider (708). A spring (710) is provided at the bottom of the slider (708) that is sleeved on the slide rod (709).

2. The LNG exhaust gas purification device according to claim 1, characterized in that: The top of the guide plate (102) is connected to the inner wall of the tower body (101). An air inlet pipe is provided at one end of the tower body (101) near the guide plate (102). The guide plate (102) guides the exhaust gas ejected from the air inlet pipe to the solid particle interception mechanism (7) and intercepts solid particles through the filter element (704) on the side near the air inlet pipe.

3. The LNG exhaust gas purification device according to claim 1, characterized in that: The cleaning device (8) includes a water pump (801), a water pumping pipe (802) and two water outlet pipes (803). The tower body (101) is equipped with a water collection chamber (104) isolated from the tower body (101). The water inlet of the water pumping pipe (802) is located in the water collection chamber (104). The two water outlet pipes (803) are distributed on both sides of the guide plate (102). The two water outlet pipes (803) are respectively equipped with water outlet heads (804) with opposite water outlet directions and downward tilted outlets. The water sprayed from the water outlet head (804) drives the turntable (701) to rotate through the impact arc-shaped toothed piece (706) and eventually flows back into the tower body (101). During the rotation of the turntable (701), the solid particles attached to the bottom of the filter plate (705) and the filter holes are washed.

4. The LNG exhaust gas purification device according to claim 1, characterized in that: A solid particle collector (9) located at the bottom of the turntable (701) is inserted into the tower body (101). The solid particle collector (9) includes a box body (901), a limiting plate (902), and an end cap (903). A filter screen is provided at the bottom of the box body (901). The filter screen can intercept solid particles that rush down from the filter plate (705). The limiting plate (902) is rotatably connected to the box body (901).

5. The LNG exhaust gas purification device according to claim 3, characterized in that: The water inside the tower body (101) and the water collection tank (104) is circulated through the cleaning device (8) and the water circulation device (10). The water circulation device (10) includes a corrugated pipe one (1001) and a corrugated pipe two (1002) that are respectively connected to the tower body (101) and the water collection tank (104). The corrugated pipe one (1001) and the corrugated pipe two (1002) are connected by a circulation pump. The corrugated pipe one (1001) is provided with a water filter element (1003) that can filter the water drawn out from the tower body (101).

6. The LNG exhaust gas purification device according to claim 5, characterized in that: The bottom of the tower body (101) is connected to a waste gas discharge pipe (3). The waste gas discharge pipe (3) consists of a vertical section and a horizontal section. The vertical section is located inside the tower body (101) and passes through the waste gas absorption structure (5) and the ammonia release structure (6) at the same time. The horizontal section is equipped with a water pipe cooling device (2) that can cool the first corrugated pipe (1001) and the second corrugated pipe (1002) and its end is connected to the fan (4).

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