Marine diesel engine tail gas treatment device for environmental protection engineering

Abstract

The invention discloses a marine diesel engine tail gas treatment device for environmental protection engineering, and belongs to the technical field of tail gas treatment equipment.The marine diesel engine tail gas treatment device comprises a bottom plate, a reduction assembly, a filtering assembly and an adsorption assembly are arranged on the bottom plate, and direct emission or further adsorption treatment can be automatically selected according to the detection result of an ammonia concentration sensor; according to the present invention, the requirements of different emission standards can be flexibly met, the adsorption assembly is arranged so as to adsorb the residual ammonia gas in the flue gas through the zeolite in the plurality of adsorption cylinders, the regeneration of the zeolite and the recovery of the ammonia gas can be achieved through the heating ring plate, and the filtration assembly is arranged so as to filter the particulate matters in the flue gas, and through mutual cooperation of the reduction assembly, the filtering assembly and the adsorption assembly, efficient purification of the tail gas of the marine diesel engine can be achieved, and the strict environment-friendly emission standard is met.

Description

Technical Field

[0001] The invention relates to the technical field of exhaust gas treatment equipment, and in particular to an exhaust gas treatment device for marine diesel engines used in environmental protection projects. Background Art

[0002] With the increasingly stringent global environmental regulations, the problem of ship diesel engine exhaust emissions has become a key governance target in the field of environmental protection engineering. Nitrogen oxides and particulate matter in diesel engine exhaust are the main pollutants, causing serious harm to the atmospheric environment and human health. Selective catalytic reduction technology is the mainstream method for treating nitrogen oxides. By spraying urea solution into the exhaust gas, ammonia is generated as a reducing agent to convert nitrogen oxides into harmless nitrogen and water. However, when spraying urea aqueous solution, if too much urea is sprayed, after the ammonia storage saturation reaches a certain level, ammonia will be directly discharged into the atmosphere, causing ammonia escape. If ammonia escape is to be reduced or prevented, the amount of ammonia sprayed will be reduced, but the possibility of ammonia escape will be reduced and the nitrogen oxide conversion efficiency will also be reduced, which cannot meet the emission requirements. When too much urea is sprayed, the conversion rate of nitrogen oxides can be increased, but the risk of ammonia escape increases, resulting in secondary pollution, and the excessive consumption of urea increases the use cost. That is, the existing treatment device cannot flexibly adjust the treatment mode according to the environmental protection requirements of the emission area, and it is difficult to meet the emission requirements under different standards. Therefore, the present invention provides a ship diesel engine exhaust treatment device for environmental protection engineering. Summary of the invention

[0003] In view of the defects in the prior art, the present invention provides a marine diesel engine exhaust treatment device for environmental protection engineering, which overcomes the problem that the treatment mode cannot be flexibly adjusted according to the environmental protection requirements of the emission area and it is difficult to meet the emission requirements under different standards.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a marine diesel engine exhaust treatment device for environmental protection engineering, comprising a bottom plate, on which a reduction component, a filtering component and an adsorption component are arranged, the reduction component comprising a reduction long cylinder and a liquid storage tank, a plurality of atomizing nozzles are evenly and fixedly arranged on the reduction long cylinder, the filtering component comprising a conical filter bin and a fan-shaped cover plate, a filter chamber is formed between the conical filter bin and the fan-shaped cover plate, a plurality of fan-shaped filter screen plates and a plurality of strip scrapers are evenly arranged on the inner side of the conical filter bin, the strip scrapers are used to scrape off the attachments on the surface of the fan-shaped filter screen plate, the adsorption component comprises a switching ring plate, a yielding circular plate, a straight pipe and a sealing circular plate, the yielding circular plate and the sealing circular plate are symmetrically arranged on both sides of the switching ring plate, six adsorption cylinders are rotatably installed in a circular array on the switching ring plate, and partition screen plates are symmetrically arranged on the adsorption cylinders, zeolites are piled between the adsorption cylinders and the corresponding two partition screen plates, and two U-shaped pipes are arranged on the yielding circular plate and the sealing circular plate, and the U-shaped pipe is used to connect the corresponding two adsorption cylinders.

[0005] Furthermore, the reduction cylinder and the liquid storage tank are both fixedly mounted on the bottom plate, a shunt pipe is fixedly mounted on the reduction cylinder, the atomizing nozzles are all connected to the shunt pipe, a liquid delivery pipe is arranged between the liquid storage tank and the shunt pipe, a liquid replenishing pipe is also arranged on the liquid storage tank, a smoke inlet pipe and an air guide pipe 1 are fixedly mounted on the reduction cylinder, the axes of the reduction cylinder, the smoke inlet pipe and the air guide pipe 1 are in the same straight line, and the air guide pipe 1 is used to connect the reduction cylinder and the filter chamber.

[0006] Furthermore, the fan-shaped cover plate is slidably mounted on the base plate, the conical filter bin is fixedly mounted on the base plate, an expansion screw is rotatably mounted on the base plate, the expansion screw and the fan-shaped cover plate constitute a spiral pair, the fan-shaped filter mesh plates are fixedly mounted inside the conical filter bin, and a plurality of circular rotating plates are rotatably mounted on the conical filter bin in a linear array, the fan-shaped filter mesh plates are respectively fixedly connected to the corresponding circular rotating plates, and the fan-shaped filter mesh plates are used to filter impurities in the flue gas.

[0007] Furthermore, the sealing circular plate is fixedly mounted on the base plate, a switching gear ring is fixedly mounted on the switching ring plate, the switching gear ring is rotatably mounted on the base plate, the giving way circular plate is slidably mounted on the base plate, the straight-row pipe is fixedly mounted on the sealing circular plate, the axes of the switching ring plate and the straight-row pipe are on the same straight line, and the switching ring plate and the giving way circular plate are both movably connected to the straight-row pipe.

[0008] Furthermore, an adsorption chamber is formed between the adsorption cylinder, the yield circular plate and the sealing circular plate, an air inlet pipe is fixedly installed on the sealing circular plate, an exhaust pipe is fixedly installed on the yield circular plate, air guide pipe 2 is fixedly installed on the surface of the conical filter bin farthest from air guide pipe 1, an electric three-way valve is fixedly installed between the straight exhaust pipe, air guide pipe 2 and the air inlet pipe, and an ammonia concentration sensor is fixedly installed on air guide pipe 2.

[0009] Furthermore, a recovery pipe is fixedly installed on the sealing circular plate, a recovery box is fixedly installed on the bottom plate, the recovery pipe is connected to the recovery box, an air supply pipe is arranged between the recovery box and the diversion pipe, a heating ring plate is fixedly installed on the adsorption cylinder, a fan-shaped limit strip plate 2 is fixedly arranged on the inner side of the switching ring plate, an arc-shaped limit block is fixedly installed on the heating ring plate, and an arc-shaped slide groove cooperating with the fan-shaped limit strip plate 2 is arranged on the arc-shaped limit block.

[0010] Furthermore, when one of the six adsorption cylinders is located at the farthest position from the lower surface of the bottom plate, the adsorption cylinder is connected to the diversion pipe, and under the action of the air intake pipe, the exhaust pipe and the four U-shaped tubes, the remaining five of the six adsorption cylinders form a continuous adsorption channel.

[0011] Further, six square long rods are slidably mounted in a circumferential array on the switching ring plate. Separation ring plates are fixedly arranged at the ends of the square long rods closest to the reduction cylinder. The separation ring plates are slidably engaged with the switching ring plate, and the separation ring plates are rotatably connected to the corresponding partition sieve plates. The partition sieve plate closest to the reduction cylinder is slidably engaged with the corresponding adsorption cylinder. Connecting long rods are fixedly arranged between the corresponding two partition sieve plates.

[0012] Further, limit round blocks are fixedly arranged at the ends of the square long rods farthest from the reduction cylinder. A sector limit strip plate I and an adjustment motor are fixedly mounted on the sealing circular plate. Arc-shaped sliding grooves cooperating with the sector limit strip plate I are arranged on the limit round blocks. The sector limit strip plate I and the limit round blocks are used to limit the movement of the square long rods. A separation sliding plate is slidably mounted on the adjustment motor. An arc-shaped strip plate is fixedly arranged on the separation sliding plate. The projections of the arc-shaped strip plate and the sector limit strip plate I on the end face of the switching ring plate form a complete ring plate.

[0013] The beneficial effects of the present invention compared with the prior art are as follows: (1) According to the detection results of the ammonia concentration sensor, the present invention can automatically select direct emission or further adsorption treatment, flexibly meet the requirements of different emission standards, and ensure that the tail gas meets the emission standards whether in the restricted emission area or the non-restricted emission area; (2) By setting the adsorption assembly, the present invention can adsorb the residual ammonia in the flue gas through the zeolite in multiple adsorption cylinders, and realize the regeneration of the zeolite and the recovery of ammonia through the heating ring plate. The recovered ammonia can be reused for the reduction reaction, improving the resource utilization rate and reducing secondary pollution at the same time; (3) By setting the filtration assembly, the present invention can filter the particulate matter in the flue gas, thereby reducing air pollution and preventing particulate matter from adhering to the zeolite and affecting the ammonia adsorption effect of the zeolite; (4) Through the mutual cooperation of the reduction assembly, the filtration assembly, and the adsorption assembly, the present invention can realize the efficient purification of the exhaust gas of ship diesel engines and meet strict environmental protection emission standards. Brief Description of the Drawings

[0014] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure at the liquid storage tank of the present invention; Figure 3 is a top view of the overall structure of the present invention; Figure 4 is a schematic diagram of the internal structure of the conical filter bin of the present invention; Figure 5 is a schematic diagram of the structure at the sealing circular plate of the present invention; Figure 6 is Figure 5 a partial enlarged schematic diagram at A in Figure 7 is a schematic diagram of the structure of the adsorption assembly of the present invention; Figure 8 It is a structural schematic diagram of the circular plate of the present invention; Figure 9 It is a structural schematic diagram of the switching ring plate of the present invention; Figure 10 This is a schematic diagram of the structure of a fan-shaped limiting strip plate of the present invention; Figure 11 for Figure 10 A partial enlarged schematic diagram of point B in the middle; Figure 12 for Figure 10 A partial enlarged schematic diagram of point C in the middle; Figure 13 This is a schematic diagram of the structure of the connection of the long rod of the present invention; Figure 14 It is a structural schematic diagram of the straight pipe of the present invention; Figure 15 for Figure 14 A partial enlarged schematic diagram of point D in the middle.

[0015] Figure numerals: 101-bottom plate; 102-reduction long cylinder; 103-conical filter bin; 104-recovery box; 105-liquid storage tank; 106-fan-shaped cover plate; 107-switching ring plate; 108-giving way circular plate; 109-straight pipe; 110-recovery pipe; 111-smoke inlet pipe; 112-diverter pipe; 113-air delivery pipe; 114-recovery air pump; 115-air delivery pump; 116-sealing circular plate; 117-liquid delivery pipe; 118-liquid replenishment pipe; 119-liquid delivery pump; 120-liquid replenishment pump; 121-air guide pipe 1; 122-air guide pipe 2; 123-electric three-way valve; 124-ammonia concentration sensor; 125-fan-shaped filter screen plate; 126-circular rotating plate; 127-strip scraper; 128-cleaning motor; 129 - atomizing nozzle; 130- air inlet pipe; 131- unfolding screw rod; 132- unfolding motor; 133- U-shaped tube; 134- fan-shaped limiting strip plate 1; 135- exhaust pipe; 136- switching gear ring; 137- switching motor; 138- switching gear; 139- giving way screw rod; 140- giving way motor; 141- square long rod; 142- limiting round block; 143- fan-shaped limiting strip plate 2; 144- heating ring plate; 145- adsorption cylinder; 146- separation ring plate; 147- separation screen plate; 148- adjusting gear ring; 149- adjusting motor; 150- adjusting gear; 151- arc limiting block; 152- connecting long rod; 153- arc strip plate; 154- separation slide plate; 155- separation screw rod; 156- separation motor. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0017] Example: ReferenceFigures 1 - 15 , a marine diesel engine tail gas treatment device for environmental protection engineering, including a bottom plate 101. A reduction component is arranged on the bottom plate 101. The reduction component includes a reduction long cylinder 102 and a liquid storage tank 105. Both the reduction long cylinder 102 and the liquid storage tank 105 are fixedly installed on the bottom plate 101. A plurality of atomizing nozzles 129 are evenly and fixedly arranged on the reduction long cylinder 102. A shunt pipe 112 is fixedly installed on the reduction long cylinder 102. The atomizing nozzles 129 are all communicated with the shunt pipe 112. A liquid delivery pipe 117 is arranged between the liquid storage tank 105 and the shunt pipe 112. A liquid delivery pump 119 is arranged on the liquid delivery pipe 117. A liquid replenishing pipe 118 is also arranged on the liquid storage tank 105. A liquid replenishing pump 120 is arranged on the liquid replenishing pipe 118. Both the liquid replenishing pump 120 and the liquid delivery pump 119 are fixedly installed on the liquid storage tank 105. An inlet smoke pipe 111 and a first guide air pipe 121 are fixedly arranged on the reduction long cylinder 102. The axes of the reduction long cylinder 102, the inlet smoke pipe 111, and the first guide air pipe 121 are on the same straight line.

[0018] By starting the liquid replenishing pump 120 to control the flow of the liquid replenishing pipe 118, the urea aqueous solution can be replenished to the liquid storage tank 105. Starting the liquid delivery pump 119 causes the liquid delivery pipe 117 to extract the urea aqueous solution in the liquid storage tank 105. The urea aqueous solution enters the shunt pipe 112 along the liquid delivery pipe 117 and finally sprays out from each atomizing nozzle 129, and the atomization of the urea aqueous solution is realized under the action of the atomizing nozzle 129.

[0019] The flue gas after combustion enters the reduction long cylinder 102 along the inlet smoke pipe 111. The urea aqueous solution atomized into the reduction long cylinder 102 along the atomizing nozzle 129 undergoes hydrolysis and pyrolysis under the action of the high-temperature flue gas, generating the required reducing agent ammonia. The nitrogen oxides in the flue gas are converted into nitrogen and water under the action of ammonia.

[0020] A filtering component is arranged on the bottom plate 101. The filtering component includes a conical filtering chamber 103 and a sector-shaped cover plate 106. A filtering chamber is formed between the conical filtering chamber 103 and the sector-shaped cover plate 106. The sector-shaped cover plate 106 is slidably installed on the bottom plate 101. The conical filtering chamber 103 is fixedly installed on the bottom plate 101. An unfolding lead screw 131 is rotatably installed on the bottom plate 101. The unfolding lead screw 131 and the sector-shaped cover plate 106 form a screw pair. An unfolding motor 132 is fixedly installed on the bottom plate 101. The output shaft of the unfolding motor 132 is fixedly connected to the unfolding lead screw 131. Starting the unfolding motor 132 drives the unfolding lead screw 131 to rotate, which makes the sector-shaped cover plate 106 move up and down relative to the bottom plate 101. When the sector-shaped cover plate 106 is at the position farthest from the lower surface of the bottom plate 101, a closed filtering chamber is formed between the conical filtering chamber 103 and the sector-shaped cover plate 106. The first guide air pipe 121 is used to connect the reduction long cylinder 102 and the filtering chamber. Under the action of the first guide air pipe 121, the flue gas reduced by the reduction component enters the filtering chamber along the first guide air pipe 121.

[0021] A plurality of fan-shaped filter screens 125 and a plurality of strip scrapers 127 are evenly arranged on the inner side of the conical filter bin 103. The strip scrapers 127 are used to scrape off the attachments on the surface of the fan-shaped filter screens 125. The fan-shaped filter screens 125 are fixedly installed inside the conical filter bin 103. The fan-shaped filter screens 125 and the strip scrapers 127 are arranged at intervals. A plurality of circular rotating plates 126 are rotatably installed in a linear array on the conical filter bin 103. The fan-shaped filter screens 125 are fixedly connected to the corresponding circular rotating plates 126 respectively. The fan-shaped filter screens 125 are used to filter impurities in the flue gas. A cleaning motor 128 is fixedly installed on the conical filter bin 103. The circular rotating plates 126 are fixedly connected to the output shaft of the cleaning motor 128. The strip scrapers 127 are in contact with the surfaces of the corresponding fan-shaped filter screens 125 respectively.

[0022] The smoke enters the filter chamber along the air duct 121, and the particulate matter in the smoke is filtered under the action of multiple fan-shaped filter screens 125. The particulate matter is easy to adhere to the surface of the fan-shaped filter screen 125, which can easily affect the flow capacity of the fan-shaped filter screen 125. Therefore, the cleaning motor 128 is started regularly to drive the circular rotating plate 126 to rotate synchronously, so that the strip scraper 127 rotates. Under the action of the strip scraper 127, the attachments accumulated on the surface of the fan-shaped filter screen 125 are scraped off, and the scraped attachments are accumulated on the fan-shaped cover 106. The expansion motor 132 is started regularly to move the fan-shaped cover 106 downward, and then the particulate matter accumulated on the fan-shaped cover 106 is cleaned.

[0023] The bottom plate 101 is provided with an adsorption assembly, which includes a switching ring plate 107, a yielding circular plate 108, a straight pipe 109, and a sealing circular plate 116. The yielding circular plate 108 and the sealing circular plate 116 are symmetrically arranged on both sides of the switching ring plate 107. The surface of the switching ring plate 107 closest to the sealing circular plate 116 and the surface of the sealing circular plate 116 closest to the switching ring plate 107 are on the same plane. The sealing circular plate 116 is fixedly mounted on the bottom plate 101. A switching gear ring 136 is fixedly mounted on the switching ring plate 107. The switching gear ring 136 It is rotatably mounted on the base plate 101, and a switching motor 137 is rotatably mounted on the base plate 101. A switching gear 138 is fixedly mounted on the output shaft of the switching motor 137. The switching gear 138 and the switching gear ring 136 are meshed to form a gear pair. The yielding circular plate 108 is slidably mounted on the base plate 101, and a yielding screw rod 139 is rotatably mounted on the base plate 101. The yielding screw rod 139 and the yielding circular plate 108 form a spiral pair. A yielding motor 140 is fixedly mounted on the base plate 101, and the output shaft of the yielding motor 140 and the yielding screw rod 139 are fixedly connected.

[0024] In the initial position, the giving way circular plate 108 is located at the position closest to the switching ring plate 107. At this time, the surface of the switching ring plate 107 closest to the giving way circular plate 108 and the surface of the giving way circular plate 108 closest to the switching ring plate 107 are on the same plane. Starting the giving way motor 140 to drive the giving way screw 139 to rotate can make the giving way circular plate 108 move away from the switching ring plate 107. Starting the switching motor 137 to drive the switching gear 138 to rotate can make the switching gear ring 136 rotate, and then the switching ring plate 107 rotates synchronously, and the switching ring plate 107 rotates relative to the giving way circular plate 108 and the sealing circular plate 116.

[0025] Six adsorption cylinders 145 are installed in the rotating circular array on the switching ring plate 107. There is friction between the adsorption cylinder 145 and the switching ring plate 107. The adsorption cylinder 145 will not rotate when not subjected to external force. When the yielding circular plate 108 and the sealing circular plate 116 are both located at the position closest to the switching ring plate 107, an adsorption chamber is formed among the adsorption cylinder 145, the yielding circular plate 108 and the sealing circular plate 116.

[0026] A sector-shaped limiting strip plate 143 is fixedly provided on the inner side of the switching ring plate 107, an arc-shaped limiting block 151 is fixedly installed on the heating ring plate 144, and an arc-shaped sliding groove cooperating with the sector-shaped limiting strip plate 143 is provided on the arc-shaped limiting block 151. The notch on the sector-shaped limiting strip plate 143 is positioned directly above the bottom plate 101, and a positioning gear ring 148 is fixedly installed on the adsorption cylinder 145. A positioning motor 149 is fixedly installed on the switching ring plate 107, and a positioning gear 150 is fixedly installed on the output shaft of the positioning motor 149. When the positioning gear 150 and the positioning gear ring 148 are engaged, a gear pair is formed.

[0027] In the initial position, one of the six adsorption cylinders 145 is located at the farthest position from the lower surface of the base plate 101, the arc-shaped limit block 151 on the adsorption cylinder 145 is disengaged from and engaged with the sector-shaped limit strip 143, and the adjustment tooth ring 148 and the adjustment gear 150 on the adsorption cylinder 145 are in a meshing state, and the arc-shaped limit blocks 151 of other adsorption cylinders 145 are in an engaged state with the sector-shaped limit strip 143. Under the action of the sector-shaped limit strip 143 and the arc-shaped limit block 151, other adsorption cylinders 145 cannot rotate relative to the switching ring plate 107. At this time, the adjustment motor 149 is started to drive the adjustment gear 150 to rotate, and under the action of the adjustment tooth ring 148, the adsorption cylinder 145 farthest from the lower surface of the base plate 101 rotates.

[0028] When it is necessary to rotate other adsorption cylinders 145, the positioning motor 149 is started to drive the adsorption cylinder 145 farthest from the base plate 101 to rotate, so that the arc-shaped limit block 151 on the adsorption cylinder 145 moves to the position farthest from the base plate 101, and then the switching ring plate 107 is driven to rotate, and the arc-shaped limit block 151 on the adsorption cylinder 145 engages with the second fan-shaped limit strip 143. Under the action of the second fan-shaped limit strip 143, the adsorption cylinder 145 cannot rotate. Rotating the switching ring plate 107 can rotate the required adsorption cylinder 145 to the position farthest from the base plate 101. Under the action of the friction between the adsorption cylinder 145 and the switching ring plate 107, the adsorption cylinder 145 will not rotate when it rotates relative to the axis of the switching ring plate 107.

[0029] The adsorption cylinder 145 is symmetrically provided with partition sieve plates 147, and zeolite is piled up between the adsorption cylinder 145 and the corresponding two partition sieve plates 147. A heating ring plate 144 is fixedly installed on the adsorption cylinder 145, and a connecting long rod 152 is fixedly provided between the corresponding two partition sieve plates 147. The corresponding two partition sieve plates 147 are fixedly connected by the connecting long rod 152, and the partition sieve plate 147 closest to the reduction cylinder 102 is slidably matched with the corresponding adsorption cylinder 145.

[0030] Two U-shaped tubes 133 are provided on the yielding circular plate 108 and the sealing circular plate 116. The U-shaped tubes 133 are used to connect the corresponding two adsorption cylinders 145. The straight-row tubes 109 are fixedly installed on the sealing circular plate 116. The axes of the switching ring plate 107 and the straight-row tubes 109 are on the same straight line. The switching ring plate 107 and the yielding circular plate 108 are movably connected to the straight-row tubes 109. When the switching ring plate 107 rotates relative to the bottom plate 101, the switching ring plate 107 rotates relative to the straight-row tubes 109. When the yielding circular plate 108 slides relative to the bottom plate 101, the yielding circular plate 108 slides relative to the straight-row tubes 109.

[0031] An air intake pipe 130 is fixedly mounted on the sealing circular plate 116, an exhaust pipe 135 is fixedly mounted on the giving way circular plate 108, an air guide pipe 2 122 is fixedly mounted on the surface of the conical filter bin 103 farthest from the air guide pipe 1 121, an electric three-way valve 123 is fixedly mounted between the straight pipe 109, the air guide pipe 2 122 and the air intake pipe 130, an ammonia concentration sensor 124 is fixedly mounted on the air guide pipe 2 122, a recovery pipe 110 is also fixedly mounted on the sealing circular plate 116, a recovery air pump 114 is mounted on the recovery pipe 110, a recovery box 104 is fixedly mounted on the bottom plate 101, the recovery pipe 110 is connected to the recovery box 104, an air supply pipe 113 is arranged between the recovery box 104 and the diverter pipe 112, an air supply pipe 113 is arranged on the air supply pipe 113, and both the recovery air pump 114 and the air supply pump 115 are fixedly mounted on the recovery box 104.

[0032] When one of the six adsorption cylinders 145 is at the position farthest from the lower surface of the bottom plate 101, this adsorption cylinder 145 communicates with the shunt pipe 112, and under the action of the intake pipe 130, the exhaust pipe 135, and the four U-shaped pipes 133, the remaining five adsorption cylinders 145 among the six adsorption cylinders 145 form a continuous adsorption channel.

[0033] In the non-limited emission area or when the ammonia concentration sensor 124 detects that the ammonia concentration in the flue gas flowing through the second guide pipe 122 meets the emission requirements, the electric three-way valve 123 is activated to connect the second guide pipe 122 and the direct discharge pipe 109, so that the flue gas after passing through the reduction component and the filtration component is directly discharged from the direct discharge pipe 109.

[0034] When the ammonia concentration sensor 124 detects that the ammonia concentration in the flue gas flowing through the second guide pipe 122 is greater than the emission requirement, the electric three-way valve 123 is activated to connect the second guide pipe 122 and the intake pipe 130. In the initial position, one of the six adsorption cylinders 145 is at the position farthest from the bottom plate 101. The flue gas enters the corresponding adsorption cylinder 145 of the intake pipe 130 along the second guide pipe 122 and the intake pipe 130. Under the action of the zeolite in the adsorption cylinder 145, the ammonia in the flue gas is adsorbed. The zeolite in the adsorption cylinder 145 is prevented from falling under the action of the partition sieve plates 147 on both sides. The flue gas entering the corresponding adsorption cylinder 145 of the intake pipe 130 enters the corresponding U-shaped pipe 133 of this adsorption cylinder 145 after passing through this adsorption cylinder 145, and then enters the adjacent adsorption cylinder 145 along this U-shaped pipe 133. Under the action of the four U-shaped pipes 133, the flue gas continuously enters the five adsorption cylinders 145. The flue gas finally enters the adsorption cylinder 145 corresponding to the exhaust pipe 135, and finally, after being adsorbed by the zeolite in the five adsorption cylinders, the flue gas is discharged from the exhaust pipe 135.

[0035] After the adsorption assembly runs for a set period, the switching ring plate 107 is driven to rotate, so that the adsorption cylinder 145 farthest from the bottom plate 101 rotates to the position connected to the exhaust pipe 135. At this time, the adsorption cylinder 145 connected to the intake pipe 130 rotates to the position farthest from the bottom plate 101, and then continues to adsorb ammonia in the flue gas. At this time, the heating ring plate 144 on the adsorption cylinder 145 farthest from the bottom plate 101 is started to heat the inside of the adsorption cylinder 145, and the ammonia adsorbed on the zeolite is heated. After being heated, the ammonia enters the recovery box 104 along the recovery pipe 110, and the ammonia in the adsorption cylinder 145 is extracted by the recovery air pump 114, that is, the storage of the ammonia adsorbed on the zeolite is realized, so as to facilitate the subsequent reuse of the ammonia. The ammonia enters the recovery box 104, and by starting the air supply pump 115, the ammonia is sprayed out from the atomizing nozzle 129 along the air supply pipe 113 and the diversion pipe 112, and then enters the reduction cylinder 102 to reduce the nitrogen oxides again, that is, the reuse of the ammonia is realized.

[0036] When the adsorption cylinder 145 is heated by the heating ring plate 144, the positioning motor 149 is started to drive the adsorption cylinder 145 to rotate, so that the zeolite in the adsorption cylinder 145 rolls, thereby improving the heating effect on the zeolite and avoiding insufficient heating effect at the position where the zeolites contact each other.

[0037] By repeating the above steps, the ammonia adsorbed on the zeolite in the adsorption cylinder 145 can be continuously recovered and utilized, and by controlling the rotation direction of the switching ring plate 107, the ammonia adsorption amount of the zeolite in the adsorption cylinder 145 between the exhaust pipe 135 and the intake pipe 130 can be set from small to large, thereby improving the utilization rate of the zeolite.

[0038] Six rectangular long rods 141 are slidably mounted in a circular array on the switching ring plate 107. The ends of the rectangular long rods 141 closest to the reduction cylinder 102 are fixedly provided with separation ring plates 146. The separation ring plates 146 and the switching ring plates 107 are slidably matched. The separation ring plates 146 and the corresponding separation screen plates 147 are rotatably connected. In the initial position, the separation ring plates 146 are located at the position closest to the sealing circular plate 116. At this time, the separation ring plates 146 are closest to the surface of the yielding circular plate 108. The surface of the yielding circular plate 108 which is closest to the switching ring plate 107 is on the same plane, a limiting circular block 142 is fixedly provided at the end of the square long rod 141 which is farthest from the restoring long cylinder 102, a fan-shaped limiting strip 134 and a positioning motor 149 are fixedly installed on the sealing circular plate 116, and an arc-shaped sliding groove cooperating with the fan-shaped limiting strip 134 is provided on the limiting circular block 142, and the fan-shaped limiting strip 134 and the limiting circular block 142 are used to limit the movement of the square long rod 141.

[0039] A separation slide 154 is slidably mounted on the positioning motor 149, and an arc-shaped strip 153 is fixedly arranged on the separation slide 154. The projections of the arc-shaped strip 153 and the fan-shaped limiting strip 134 on the end face of the switching ring plate 107 form a complete ring plate. A separation screw rod 155 is rotatably mounted on the positioning motor 149. The separation screw rod 155 and the separation slide 154 form a spiral pair. A separation motor 156 is fixedly mounted on the positioning motor 149, and the output shaft of the separation motor 156 is fixedly connected to the separation screw rod 155.

[0040] In the initial position, the separation slide 154 is located at the position closest to the separation motor 156. At this time, the fan-shaped limit strip 134 and the arc strip 153 are combined to form a complete ring plate, and the limit round blocks 142 are combined with the ring plate formed by the fan-shaped limit strip 134 and the arc strip 153. Under the action of the fan-shaped limit strip 134 and the arc strip 153, the positions of the partition screen plate 147 and the separation ring plate 146 will not move. When the adsorption cylinder 145 is driven to rotate relative to the switching ring plate 107, the corresponding partition screen plate 147 rotates relative to the separation ring plate 146.

[0041] When the zeolite in the adsorption cylinder 145 needs to be replaced, the switching ring plate 107 is driven to rotate, so that the adsorption cylinder 145 of the zeolite to be replaced rotates to the position closest to the lower surface of the bottom plate 101. At this time, the limiting round block 142 corresponding to the adsorption cylinder 145 is engaged with the arc strip plate 153, and the limiting round block 142 is separated from the contact with the fan-shaped limiting strip plate 143, and then the yielding motor 140 is started to make the yielding circular plate 108 move to the position farthest from the switching ring plate 107, and then the separation motor 156 is started to drive the separation screw rod 155 to rotate. , that is, the arc strip 153 and the separation slide plate 154 are moved synchronously in the direction away from the separation motor 156, and then the limiting round block 142 corresponding to the adsorption cylinder 145 is moved in the direction away from the separation motor 156, that is, the square long rod 141, the separation ring plate 146, and the partition screen plate 147 are moved synchronously in the direction away from the separation motor 156, and the zeolite in the adsorption cylinder 145 is pushed out of the adsorption cylinder 145 under the action of the partition screen plate 147, and the above steps are performed in reverse, and new zeolite is added to the adsorption cylinder 145.

[0042] By repeating the above steps, the zeolite in each adsorption cylinder 145 can be replaced.

[0043] Working principle: Flue gas enters the reduction cylinder 102 along the smoke inlet pipe 111, atomizes and sprays the urea aqueous solution in the liquid storage tank 105 from the atomizing nozzle 129 to generate ammonia gas, or injects the ammonia gas stored in the recovery tank 104 from the atomizing nozzle 129 into the reduction cylinder 102. Under the action of ammonia gas, the reduction of nitrogen oxides in the flue gas is realized. The flue gas after removing nitrogen oxides enters the filtration chamber along the first guide pipe 121, and is filtered under the action of multiple sector-shaped filter mesh plates 125, avoiding impurities in the flue gas from entering the adsorption cylinder 145 and adhering to the surface of zeolite, thus affecting the adsorption effect of zeolite on ammonia gas.

[0044] The flue gas after passing through the filtration component enters the electric three-way valve 123 along the second guide pipe 122. When it is located in a non-restricted emission area or the ammonia gas concentration sensor 124 detects that the ammonia gas concentration in the flue gas meets the emission requirements, under the action of the electric three-way valve 123, the second guide pipe 122 is connected to the direct discharge pipe 109, that is, the flue gas is discharged from the direct discharge pipe 109.

[0045] When it is located in a restricted emission area or the ammonia gas concentration sensor 124 detects that the ammonia gas concentration in the flue gas does not meet the emission requirements, under the action of the electric three-way valve 123, the second guide pipe 122 is connected to the inlet pipe 130, that is, the flue gas enters the adsorption component. Under the action of zeolite in multiple adsorption cylinders 145, the ammonia gas concentration in the flue gas is reduced, and finally the ammonia gas is discharged from the exhaust pipe 135. And under the action of the recovery pipe 110 and the heating ring plate 144, the ammonia gas adsorbed on the zeolite is recovered.

[0046] The present invention is not limited to the above specific embodiments. Those skilled in the art can make various changes starting from the above concepts without creative labor, and all fall within the protection scope of the present invention.

Claims

1. An exhaust gas treatment device for a marine diesel engine used in environmental protection engineering, including a bottom plate (101), characterized in that: The bottom plate (101) is provided with a reduction component, a filtering component, and an adsorption component. The reduction component comprises a reduction cylinder (102) and a liquid storage tank (105). A plurality of atomizing nozzles (129) are evenly and fixedly arranged on the reduction cylinder (102). The filtering component comprises a conical filtering chamber (103) and a fan-shaped cover plate (106). A filtering chamber is formed between the conical filtering chamber (103) and the fan-shaped cover plate (106). A plurality of fan-shaped filter screens (125) and a plurality of strip-shaped scrapers (127) are evenly arranged on the inner side of the conical filtering chamber (103). The strip-shaped scrapers (127) are used to scrape off the attached matter on the surface of the fan-shaped filter screens (125). The adsorption component comprises a switching ring plate (1 07), a clearance circular plate (108), a straight pipe (109), and a sealing circular plate (116). The clearance circular plate (108) and the sealing circular plate (116) are symmetrically arranged on both sides of the switching ring plate (107). Six adsorption cylinders (145) are rotatably installed in a circular array on the switching ring plate (107). The adsorption cylinders (145) are symmetrically provided with partition sieve plates (147). Zeolite is piled between the adsorption cylinders (145) and the corresponding two partition sieve plates (147). Two U-shaped tubes (133) are arranged on the clearance circular plate (108) and the sealing circular plate (116). The U-shaped tubes (133) are used to connect the corresponding two adsorption cylinders (145).

2. The exhaust gas treatment device for a marine diesel engine used in environmental protection engineering according to claim 1, characterized in that: The reduction cylinder (102) and the liquid storage tank (105) are both fixedly mounted on the bottom plate (101); a shunt pipe (112) is fixedly mounted on the reduction cylinder (102); the atomizing nozzles (129) are all in communication with the shunt pipe (112); a liquid delivery pipe (117) is provided between the liquid storage tank (105) and the shunt pipe (112); a liquid replenishing pipe (118) is also provided on the liquid storage tank (105); a smoke inlet pipe (111) and an air guide pipe (121) are fixedly mounted on the reduction cylinder (102); the axes of the reduction cylinder (102), the smoke inlet pipe (111) and the air guide pipe (121) are in the same straight line; the air guide pipe (121) is used to connect the reduction cylinder (102) and the filter chamber.

3. The exhaust gas treatment device for a marine diesel engine used in environmental protection engineering according to claim 2, characterized in that: The fan-shaped cover plate (106) is slidably mounted on the bottom plate (101), the conical filter chamber (103) is fixedly mounted on the bottom plate (101), an expansion screw rod (131) is rotatably mounted on the bottom plate (101), the expansion screw rod (131) and the fan-shaped cover plate (106) form a spiral pair, the fan-shaped filter screen plates (125) are all fixedly mounted inside the conical filter chamber (103), a plurality of circular rotating plates (126) are rotatably mounted in a linear array on the conical filter chamber (103), the fan-shaped filter screen plates (125) are respectively fixedly connected to corresponding circular rotating plates (126), and the fan-shaped filter screen plates (125) are used to filter impurities in the smoke.

4. The exhaust gas treatment device for a marine diesel engine used in environmental protection engineering according to claim 3, characterized in that: The sealing circular plate (116) is fixedly installed on the bottom plate (101). A switching gear ring (136) is fixedly installed on the switching ring plate (107). The switching gear ring (136) is rotatably installed on the bottom plate (101). The relief circular plate (108) is slidably installed on the bottom plate (101). The straight exhaust pipe (109) is fixedly installed on the sealing circular plate (116). The axes of the switching ring plate (107) and the straight exhaust pipe (109) are on the same straight line. Both the switching ring plate (107) and the relief circular plate (108) are movably connected to the straight exhaust pipe (109).

5. The exhaust gas treatment device for a marine diesel engine used in environmental protection engineering according to claim 4, characterized in that: An adsorption chamber is formed among the adsorption cylinder (145), the relief circular plate (108), and the sealing circular plate (116). An air inlet pipe (130) is fixedly installed on the sealing circular plate (116). An exhaust pipe (135) is fixedly installed on the relief circular plate (108). A second air guide pipe (122) is fixedly arranged on the surface of the conical filter chamber (103) that is farthest from the first air guide pipe (121). An electric three-way valve (123) is fixedly arranged among the straight exhaust pipe (109), the second air guide pipe (122), and the air inlet pipe (130). An ammonia concentration sensor (124) is fixedly arranged on the second air guide pipe (122).

6. The exhaust gas treatment device for a marine diesel engine used in environmental protection engineering according to claim 5, characterized in that: A recovery pipe (110) is also fixedly arranged on the sealing circular plate (116). A recovery box (104) is fixedly installed on the bottom plate (101). The recovery pipe (110) is communicated with the recovery box (104). An air supply pipe (113) is arranged between the recovery box (104) and the shunt pipe (112). Heating ring plates (144) are fixedly installed on the adsorption cylinders (145). Sector-shaped limiting strip plates II (143) are fixedly arranged on the inner side of the switching ring plate (107). Arc-shaped limiting blocks (151) are fixedly installed on the heating ring plates (144). Arc-shaped sliding grooves that cooperate with the sector-shaped limiting strip plates II (143) are arranged on the arc-shaped limiting blocks (151).

7. The exhaust gas treatment device for a marine diesel engine used in environmental protection engineering according to claim 6, characterized in that: When one of the six adsorption cylinders (145) is located at the position farthest from the lower surface of the bottom plate (101), this adsorption cylinder (145) is communicated with the shunt pipe (112). And under the action of the air inlet pipe (130), the exhaust pipe (135), and the four U-shaped pipes (133), the remaining five adsorption cylinders (145) among the six adsorption cylinders (145) form a continuous adsorption channel.

8. The exhaust gas treatment device for a marine diesel engine used in environmental protection engineering according to claim 7, characterized in that: Six square long rods (141) are slidably installed in a circumferential array on the switching ring plate (107). Separation ring plates (146) are fixedly arranged at the ends of the square long rods (141) closest to the reduction cylinder (102). The separation ring plates (146) are slidably matched with the switching ring plate (107). The separation ring plates (146) are rotatably connected to the corresponding partition sieve plates (147). The partition sieve plates (147) closest to the reduction cylinder (102) are slidably matched with the corresponding adsorption cylinders (145). Connecting long rods (152) are fixedly arranged between the corresponding two partition sieve plates (147).

9. The exhaust gas treatment device for a marine diesel engine used in environmental protection engineering according to claim 8, characterized in that: A limiting circular block (142) is fixedly arranged at the end of the square long rod (141) farthest from the restoring cylinder (102). A sector-shaped limiting strip plate I (134) and an adjusting motor (149) are fixedly installed on the sealing circular plate (116). Arc-shaped sliding grooves cooperating with the sector-shaped limiting strip plate I (134) are arranged on the limiting circular block (142). The sector-shaped limiting strip plate I (134) and the limiting circular block (142) are used to limit the movement of the square long rod (141). A separating sliding plate (154) is slidably installed on the adjusting motor (149). An arc-shaped strip plate (153) is fixedly arranged on the separating sliding plate (154). The projections of the arc-shaped strip plate (153) and the sector-shaped limiting strip plate I (134) on the end face of the switching ring plate (107) form a complete ring plate.

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