Low-speed diesel engine tail gas pretreatment equipment and method

Abstract

The invention relates to the technical field of tail gas pretreatment equipment, in particular to low-speed diesel engine tail gas pretreatment equipment and method.The low-speed diesel engine tail gas pretreatment equipment comprises a treatment box shell, a pretreatment pipe is installed in the treatment box shell, and the pretreatment pipe is used for being communicated with a diesel engine tail gas exhaust port and inputting tail gas; a particle impurity filtering mechanism is installed in the pretreatment pipe, a reducing agent spraying mechanism is installed in the treatment box shell, a water liquid recycling box is installed in the treatment box shell, and the water liquid recycling box communicates with the pretreatment pipe. Through the structural arrangement of the pretreatment pipe, the particle impurity filtering mechanism, the reducing agent spraying mechanism, the water liquid recycling box, the dehumidification pipe, the drying pipe, the water conveying mechanism and the water supply pipe, solid particle impurities, harmful substances and water in tail gas can be integrally removed, and then the pollution during tail gas emission is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas pretreatment equipment, and in particular to a low-speed diesel engine tail gas pretreatment device and method. Background Art

[0002] As the world pays more and more attention to environmental protection and sustainable development, reducing emissions and improving fuel efficiency have become important goals for the development of diesel engine technology. Low-speed diesel engines are widely used in ships, generator sets, and large machinery due to their efficient combustion characteristics and low unit energy consumption. However, diesel engine emissions, especially nitrogen oxides (NOx) and particulate matter (PM) emissions, are still environmental issues that need to be solved urgently. Therefore, appropriate exhaust pretreatment has become an important link in reducing environmental impact.

[0003] In the prior art, a diesel engine exhaust pretreatment device is disclosed in the patent document with publication number CN202321201197.6. The solution is to pass the exhaust gas generated by the diesel engine body into the filter box through the first connecting pipe, and filter it through two layers of filter screens. The rubber ring has a sealing effect between the filter box and the filter screen. After the filtration is completed, the filter screen can be pulled out and replaced and cleaned. The unburned components enter the heat conduction box through the second connecting pipe for recollection and processing. The filtered gas enters the storage box through the exhaust fan, and then the gas enters the heat dissipation box for treatment.

[0004] In the above technology, when pre-treating the exhaust gas of the diesel engine, the particulate impurities in the exhaust gas are first filtered through a filter, and then the filtered exhaust gas is cooled before being discharged. However, in addition to water, solid particles and other impurities, the exhaust gas also contains a variety of toxic and harmful substances, such as nitrogen oxides and sulfur oxides. Simple filtering cannot remove nitrogen oxides and sulfur oxides in the exhaust gas, resulting in environmental pollution after the exhaust gas is discharged. Summary of the invention

[0005] Technical issues solved

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a low-speed diesel engine exhaust pretreatment device and method, which can solve the problem in the prior art that moisture, impurities, and harmful substances in the exhaust gas cannot be removed simultaneously.

[0007] Technical Solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] The present invention provides a low-speed diesel engine exhaust pretreatment device, comprising a treatment box shell, wherein a pretreatment pipe, a dehumidification pipe, a drying pipe and an exhaust pipe which are connected in sequence are installed inside the treatment box shell, wherein the pretreatment pipe is used to be connected to the exhaust port of the diesel engine, a particle impurity filtering mechanism and a reducing agent spraying mechanism are arranged in the pretreatment pipe, a water liquid recovery box which is connected to the pretreatment pipe and is used to collect water liquid generated by the operation of the reducing agent spraying mechanism is arranged in the treatment box shell, a water absorption mechanism is arranged in the dehumidification pipe, the drying pipe is coaxially sleeved on the outer wall of the pretreatment pipe, and a heat transfer mechanism for transferring heat in the pretreatment pipe to the drying pipe is arranged on the pipe wall of the pretreatment pipe, and the exhaust pipe is used to discharge the treated exhaust gas.

[0010] Furthermore, the pretreatment pipe includes a vertical pipe installed in the treatment box shell, a connected air intake pipe is installed on the vertical pipe, one end of the air intake pipe passes through the interior of the treatment box shell, and the particulate impurity filtering mechanism is installed inside the air intake pipe.

[0011] Furthermore, the particle impurity filtering mechanism includes an insertion shaft inserted and installed in the air intake pipe, the insertion shafts are arranged in a plurality of groups and are linearly distributed, and the surfaces of the insertion shafts are provided with filter plates.

[0012] Furthermore, the air inlet pipe is arranged in a trapezoidal shape, the diameter of the opening of the air inlet pipe gradually increases toward one side of the vertical pipe, and the surface of the filter plate is provided with evenly distributed capture holes.

[0013] Furthermore, one end of the plug shaft passes through the outside of the air inlet pipe, and a sprocket is fixedly connected to the outer end surface of the plug shaft. Two adjacent groups of sprockets are connected by chain transmission. The particulate impurity filtering mechanism also includes a drive motor A installed inside the processing box shell, and the drive motor A is used to drive several groups of filter plates to rotate synchronously. The particulate impurity filtering mechanism also includes a water tank installed under the air inlet pipe, and the water tank is connected to the air inlet pipe.

[0014] Furthermore, a water delivery mechanism and a water supply pipe are installed inside the treatment box shell, the water supply pipe is used to connect the water recovery box and the water tank, the water delivery mechanism is used to deliver the water in the water recovery box to the water tank, the water delivery mechanism includes a drive motor B installed in the treatment box shell, a turntable is fixedly connected to the output shaft of the drive motor B, a connecting shaft is fixedly connected to the non-center surface of the turntable, a connecting rod is hingedly installed on the connecting shaft, and a movable sealing rod is hingedly installed on the other end of the connecting rod through the connecting shaft, the movable sealing rod is inserted in the water supply pipe, and a one-way valve B is installed inside the end of the water supply pipe that is connected to the water recovery box and the particle impurity filtering mechanism.

[0015] Furthermore, the water absorption mechanism includes a water-absorbing material installed on the inner wall of the dehumidification pipe, the lower end surface of the dehumidification pipe is provided with an opening and the opening is located below the water-absorbing material, the water absorption mechanism also includes a fixing rod connected to the lower end surface of the dehumidification pipe, the surface of the fixing rod is fitted with a pressure plate and a spring, the surface of the pressure plate is fixedly connected with a pressure block, the pressure block is fitted and installed in the opening below the dehumidification pipe, an eccentric wheel is fixedly connected to the output shaft of the drive motor B, the eccentric wheel is located below the pressure plate and abuts against the surface of the pressure plate, the dehumidification pipe is arranged as a "V" shape structure, and the lower end of the dehumidification pipe and the connection between the vertical pipe are the lowest end.

[0016] Furthermore, the reducing agent spraying mechanism includes a T-tube installed above the vertical pipe, and the reducing agent spraying mechanism also includes an electric telescopic rod installed on the upper inner wall of the processing box shell, and a piston block is fixedly connected to the piston rod of the electric telescopic rod, and the piston block is inserted into the upper end of the T-tube. The other two ends of the T-tube are respectively connected to the vertical pipe and the medicine box, and the medicine box is installed inside the processing box shell. A one-way nozzle is installed at the end of the T-tube connected to the vertical pipe, and a one-way valve A is installed at the end of the T-tube connected to the medicine box.

[0017] Furthermore, the heat transfer mechanism includes a heat dissipation copper sheet installed on the inner wall of the vertical tube, the heat dissipation copper sheet is arranged in a plurality of groups in a vertical direction, each row of the heat dissipation copper sheets is arranged in a plurality of groups with equal distances from each other in a circular distribution, and the two rows of heat dissipation copper sheets distributed up and down are staggered, and one end of the heat dissipation copper sheet passes through the vertical tube and is inserted into the interior of the drying tube.

[0018] Furthermore, the low-speed diesel engine exhaust pretreatment method comprises the following steps:

[0019] Step 1: Connect the pretreatment pipe to the exhaust port of the diesel engine so that the exhaust gas emitted by the diesel engine enters the pretreatment pipe;

[0020] Step 2: When the exhaust gas flows into the pretreatment pipe, it will pass through the particle impurity filtering mechanism and the reducing agent spraying mechanism in sequence. The particle impurity filtering mechanism will capture the solid particle impurities in the exhaust gas, and the reducing agent will be sprayed into the pretreatment pipe through the reducing agent spraying mechanism, so that the harmful substances in the exhaust gas react with the reducing agent to achieve the removal of the harmful substances. At the same time, the exhaust gas will be cooled;

[0021] Step 3: The water generated in the exhaust gas after the reaction with the reducing agent will enter the water recovery box, and the exhaust gas after the reaction will enter the drying tube through the dehumidification tube. The moisture will be removed when the exhaust gas passes through the dehumidification tube, and it will be further dried when passing through the drying tube, and finally discharged safely through the exhaust pipe.

[0022] Beneficial Effects

[0023] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0024] This solution first connects the pretreatment pipe with the exhaust outlet of the diesel engine, so that the exhaust gas will flow through the inside of the pretreatment pipe before being discharged. The particle impurity filtering mechanism is installed in the pretreatment pipe. The particle impurity filtering mechanism can capture solid particle impurities in the exhaust gas to achieve preliminary filtration of the exhaust gas. Then, the reducing agent is sprayed into the pretreatment pipe through the reducing agent spraying mechanism. The reducing agent reacts with harmful substances in the exhaust gas to remove harmful substances in the exhaust gas. Finally, the exhaust gas enters the drying pipe through the dehumidification pipe and is output, so as to achieve effective clean exhaust gas discharge.

[0025] When the particle impurity filter mechanism captures the solid particle impurities in the exhaust gas, the particle impurity filter mechanism can achieve self-cleaning through water, thereby ensuring the solid particle impurity capturing effect of the particle impurity filter mechanism;

[0026] When the reducing agent reacts with harmful substances in the exhaust gas, water liquid is generated, which is collected by a water liquid recovery tank and then transported to the particle impurity filtering mechanism through a water supply pipe for self-cleaning of the particle impurity filtering mechanism, thereby realizing the water liquid recycling of the device and improving the functionality of the device;

[0027] When the reducing agent reacts with harmful substances in the exhaust gas, water is generated, which can be used to cool the exhaust gas and further achieve heat dissipation of the exhaust gas.

[0028] In summary, the present invention can remove solid particulate impurities, harmful substances and moisture in exhaust gas in an integrated manner through the structural settings of the pretreatment pipe, particulate impurity filtering mechanism, reducing agent spraying mechanism, water recovery box, dehumidification pipe, drying pipe, water delivery mechanism and water supply pipe, thereby reducing the pollution of exhaust gas emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 Schematic diagram of the internal structure of the processing box shell in an embodiment of the present invention;

[0031] Figure 2 Schematic diagram of the external structure of the processing box shell in an embodiment of the present invention;

[0032] Figure 3 Schematic diagram of the internal structure of the processing box shell in the embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of the installation structure of the particle impurity filtering mechanism in an embodiment of the present invention;

[0034] Figure 5 Schematic diagram of the filter plate structure in an embodiment of the present invention;

[0035] Figure 6 It is a schematic diagram of the structural installation of the reducing agent spraying mechanism in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the installation of the dehumidification pipe structure in an embodiment of the present invention;

[0037] Figure 8 It is a schematic diagram of the internal structure of the drying tube in the embodiment of the present invention;

[0038] Fig. 9 It is a schematic diagram of the installation structure of the water delivery mechanism in an embodiment of the present invention;

[0039] Fig.10 It is a schematic diagram of the internal structure installation of the dehumidification tube in an embodiment of the present invention.

[0040] The numbers in the figure represent: 1. treatment box shell; 2. pretreatment pipe; 201. vertical pipe; 202. air intake pipe; 203. heat dissipation copper sheet; 3. particle impurity filtering mechanism; 301. plug shaft; 302. filter plate; 303. sprocket; 304. chain; 305. drive motor A; 306. capture hole; 307. water tank; 4. reducing agent spraying mechanism; 401. T-tube; 402. medicine box; 403. electric telescopic rod; 404. piston block; 405. one-way nozzle; 406. one-way valve A ; 407, limit block; 408, pressure sensor; 5, water recovery box; 6, dehumidification pipe; 601, water absorbing material; 602, fixing rod; 603, pressure plate; 604, pressure block; 605, spring; 7, drying tube; 701, exhaust pipe; 8, water delivery mechanism; 801, driving motor B; 802, eccentric wheel; 803, turntable; 804, connecting shaft; 805, connecting rod; 806, movable sealing rod; 9, water supply pipe; 901, one-way valve B; 10, fixing frame; 11, catalyst storage tube. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0042] The present invention will be further described below in conjunction with the embodiments.

[0043] Example:

[0044] Please refer to the attached Figure 1-10 This solution proposes a low-speed diesel engine exhaust pretreatment device. The interior of the treatment box shell 1 is set to be hollow and a cover shell is set on the surface. The interior of the treatment box shell 1 is used to seal and install various mechanisms for exhaust pretreatment, thereby ensuring the stability of various mechanisms during operation and avoiding external influences from the installation environment, which may cause equipment operation to be obstructed or cause structural damage.

[0045] Specifically, a pretreatment pipe 2 is installed inside the treatment box shell 1. One end of the pretreatment pipe 2 passes through the interior of the treatment box shell 1 and is used to communicate with the exhaust gas exhaust port of the diesel engine, so as to realize the discharge of exhaust gas from the diesel engine to the inside of the pretreatment pipe 2, and further enable the exhaust gas emitted by the diesel engine to directly enter the treatment box shell 1 to wait for subsequent pretreatment operations, thereby integrating the removal of solid particle impurities and harmful substances in the exhaust gas.

[0046] Specifically, the pretreatment pipe 2 includes a vertical pipe 201 installed in the treatment box housing 1, and the surface of the vertical pipe 201 is fixedly connected with an intake pipe 202. The vertical pipe 201 and the intake pipe 202 are arranged in an "L" shape, and the vertical pipe 201 and the intake pipe 202 are internally connected. One end of the intake pipe 202 passes through the interior of the treatment box housing 1 and is used to connect with the exhaust port of the diesel engine. A particle impurity filtering mechanism 3 is installed on the intake pipe 202, and the particle impurity filtering mechanism 3 is used to filter the exhaust gas entering the intake pipe 202, so as to capture solid particle impurities in the exhaust gas, thereby achieving preliminary filtering and pretreatment of the exhaust gas and reducing the emission pollution of the exhaust gas. A reducing agent spraying mechanism 4 is also installed inside the treatment box shell 1. The reducing agent spraying mechanism 4 is located above the vertical pipe 201. The reducing agent spraying mechanism 4 is used to spray the reducing agent into the vertical pipe 201. The reducing agent reacts with the nitrogen oxides in the exhaust gas to further remove the nitrogen monoxide and nitrogen dioxide in the exhaust gas, thereby further reducing the pollution of the exhaust gas emissions.

[0047] More specifically, the particle impurity filtering mechanism 3 includes an insert shaft 301 inserted and installed in the intake pipe 202. The insert shaft 301 is arranged in a plurality of groups and is linearly distributed. The surface of each group of insert shafts 301 is fixedly connected with a filter plate 302, and the filter plate 302 is rotatably installed inside the intake pipe 202. When the exhaust gas enters the intake pipe 202, the exhaust gas will contact the surface of the filter plate 302, and further the solid particles in the exhaust gas will adhere to the surface of the filter plate 302, thereby achieving the removal of solid particle impurities in the exhaust gas. In addition, by arranging a plurality of groups of filter plates 302 inside the intake pipe 202, the contact area between the solid particle impurities in the exhaust gas and the filter plate 302 can be increased, thereby improving the filtering effect. The intake pipe 202 is set to be in a trapezoidal shape, and the diameter of the opening of the intake pipe 202 gradually increases toward the side of the vertical pipe 201, so that the exhaust gas will reduce the flow rate after entering the intake pipe 202, so that the solid particle impurities in the exhaust gas are more easily settled on the surface of the filter plate 302 under the condition of low flow rate, thereby improving the filtering effect of the particle impurity filtering mechanism 3 on the solid particle impurities in the exhaust gas. In addition, the surface of the filter plate 302 is provided with evenly distributed capture holes 306, and the capture holes 306 can increase the roughness of the surface of the filter plate 302, further increasing the capture effect of the filter plate 302 on the particle impurities.

[0048] The reducing agent spraying mechanism 4 includes a T-tube 401 installed above the vertical tube 201, the lower end of the T-tube 401 is connected to the vertical tube 201, the horizontal end of the T-tube 401 is connected to the medicine box 402, and the medicine box 402 is installed inside the treatment box housing 1. The reducing agent spraying mechanism 4 also includes an electric telescopic rod 403 installed on the upper inner wall of the treatment box housing 1, and a piston block 404 is fixedly connected to the piston rod of the electric telescopic rod 403, and the piston block 404 is inserted inside the upper end of the T-tube 401. The electric telescopic rod 403 is opened to drive the piston block 404 to slide inside the T-tube 401, and the reducing agent in the medicine box 402 can be input from the T-tube 401 to the vertical tube 201 through pressure control, so that the reducing agent can react with harmful substances in the exhaust gas in the vertical tube 201, thereby achieving the removal of harmful substances in the exhaust gas.

[0049] A one-way nozzle 405 is installed at one end of the T-tube 401 connected to the vertical tube 201. The one-way nozzle 405 allows one-way flow from the T-tube 401 to the vertical tube 201. A one-way valve A406 is installed at one end of the T-tube 401 connected to the medicine box 402. The one-way valve A406 allows one-way flow from the medicine box 402 to the T-tube 401. Two sets of limit blocks 407 are fixedly connected to the inner wall of the vertical end of the T-tube 401. Pressure sensors 408 are installed on both sets of limit blocks 407. The piston block 404 is inserted between the two sets of limit blocks 407. The initial position of the piston block 404 is located at the lower position between the two sets of limit blocks 407. When the reducing agent spraying mechanism 4 needs to input the reducing agent into the pretreatment tube 2, the electric telescopic rod 403 is turned on and operated, and the electric telescopic rod 403 drives the piston block 404 to slide upward in the T-tube 401, further forming a negative pressure inside the T-tube 401, so that the negative pressure in the T-tube 401 will absorb the reducing agent from the medicine box 402 through the one-way valve A406, and the piston block 404 slides upward and contacts the pressure sensor 408 installed on the surface of the upper limit block 407, and the electric telescopic rod 403 will be controlled through an electrical signal to change the driving direction of the piston block 404, and the piston block 404 will be further controlled to slide down in the T-tube 401, squeezing the reducing agent absorbed in the T-tube 401, so that the reducing agent will be sprayed into the vertical pipe 201 through the one-way nozzle 405, so that the reducing agent and the exhaust gas in the vertical pipe 201 can fully react, thereby achieving the removal of harmful substances in the exhaust gas. When the piston block 404 slides down and triggers the pressure sensor 408 below, the electric telescopic rod 403 will be controlled to drive the piston block 404 to move upward again, and then the above steps will be repeated, so that the reducing agent spraying mechanism 4 can continuously add reducing agent to the pretreatment pipe 2, thereby increasing the exhaust pretreatment effect in the pretreatment pipe 2.

[0050] The reducing agent sprayed by the reducing agent spraying mechanism 4 can be replaced according to the type of harmful substances in the exhaust gas. For example, ammonia or urea can be used as a reducing agent to reduce nitrogen oxides into nitrogen and water.

[0051] A fixing frame 10 is fixedly connected to the inner wall of the vertical pipe 201, a catalyst storage tube 11 is fixedly connected to the surface of the fixing frame 10, a catalyst is stored in the catalyst storage tube 11, and an opening is provided on the surface of the catalyst storage tube 11 to expose the catalyst to the inner space of the vertical pipe 201. When the exhaust gas enters the vertical pipe 201 and reacts with the reducing agent, the catalyst in the catalyst storage tube 11 can accelerate the reaction efficiency, thereby further improving the efficiency of the exhaust gas pretreatment of the device.

[0052] The lower end of the vertical pipe 201 is fixedly connected to a water recovery tank 5, and a dehumidification pipe 6 is installed on the lower surface of the vertical pipe 201, and the dehumidification pipe 6 is located above the water recovery tank 5. When the nitrogen oxides in the tail gas are reduced to nitrogen and water, the water will flow into the water recovery tank 5 to be collected, and the nitrogen will enter the drying pipe 7 through the dehumidification pipe 6, and further discharged through the drying pipe 7, so that the solid particle impurities and harmful substances in the tail gas are removed and safely discharged, effectively protecting environmental safety.

[0053] The difference is that one end of the plug shaft 301 passes through the outside of the air inlet pipe 202, and the outer end surface of the plug shaft 301 is fixedly connected with a sprocket 303, and two adjacent groups of sprockets 303 are connected by a chain 304. The particle impurity filtering mechanism 3 also includes a driving motor A305 installed inside the treatment box housing 1, and a sprocket 303 is installed on the output shaft of the driving motor A305, and is connected to one group of sprockets 303 by a chain 304. When the particle impurity filtering mechanism 3 is filtering solid particle impurities in the exhaust gas, the driving motor A305 is turned on to run, and the driving motor A305 drives several groups of plug shafts 301 to rotate synchronously through the sprocket 303 and the chain 304, and further controls the plug shaft 301 to rotate in connection with the filter plate 302, so that the solid particle impurities in the exhaust gas are in uniform contact with the surface of the filter plate 302, thereby improving the filtering effect of the surface of the filter plate 302 on the solid particle impurities in the exhaust gas. The particle impurity filtering mechanism 3 also includes a water tank 307 installed below the air intake pipe 202. The water tank 307 is connected to the air intake pipe 202. The filter plate 302 will be inserted into the water tank 307 during rotation. By filling the water tank 307 with water, the solid particle impurities adhered to the surface of the filter plate 302 will be washed away after entering the water, thereby achieving self-cleaning of the surface of the filter plate 302 and improving the filter plate 302's effect of capturing solid particle impurities in the exhaust gas.

[0054] At the same time, the rotation speeds of the plurality of sprockets 303 are the same, but the initial installation angles of the plurality of filter plates 302 are different, thereby controlling the plurality of filter plates 302 to form a staggered distribution when rotating synchronously, thereby ensuring the filtering effect of solid particle impurities in the exhaust gas when the exhaust gas flows in the intake pipe (202).

[0055] It is worth noting that a water supply pipe 9 is installed inside the treatment box housing 1, and the water supply pipe 9 is used to transport the water in the water recovery box 5 to the particle impurity filtering mechanism 3, further realizing the reuse of the collected water, thereby reducing the consumption of water. A pipe body is provided on the water tank 307, which is used to remove the sewage after internal cleaning, and further enables the water supply pipe 9 to transport new water to the particle impurity filtering mechanism 3, which can improve the self-cleaning effect of the particle impurity filtering mechanism 3 and further increase the particle impurity filtering mechanism 3 The filtering effect of solid particulate impurities in the exhaust gas.

[0056] A water delivery mechanism 8 is installed inside the treatment box housing 1. The water delivery mechanism 8 is used to control the water in the water recovery box 5 to enter the water supply pipe 9, and enter the particle impurity filtering mechanism 3 through the water supply pipe 9. The water delivery mechanism 8 includes a driving motor B801 installed in the treatment box housing 1. A rotating disk 803 is fixedly connected to the output shaft of the driving motor B801. A connecting shaft 804 is fixedly connected to the non-center of the surface of the rotating disk 803, and a connecting rod 805 is hingedly installed through the connecting shaft 804. The other end of the connecting rod 805 is hingedly installed with a movable sealing plug 806 through the connecting shaft 804. The movable sealing plug 806 is inserted inside the water supply pipe 9. A one-way valve B901 is installed inside the end of the water supply pipe 9 that is connected to the water recovery box 5 and the particle impurity filtering mechanism 3. The one-way valve B901 can only allow the water in the water recovery box 5 to enter the water supply pipe 9 in one direction, and enter the particle impurity filtering mechanism 3 in one direction through the water supply pipe 9. When the water in the particle impurity filtering mechanism 3 needs to be replenished, the driving motor B801 is turned on and runs. The driving motor B801 drives the turntable 803 to rotate and drives the connecting rod 805 to rotate, and further pulls the movable sealing rod 806 through the connecting rod 805 to slide linearly in the one-way valve B901. When the one-way valve B901 slides to the side away from the water recovery tank 5, the water in the water recovery tank 5 will be drawn into the one-way valve B901 through the negative pressure. When the movable sealing rod 806 slides to the side close to the water recovery tank 5, the water in the one-way valve B901 will be squeezed into the particle impurity filtering mechanism 3, thereby further realizing the water in the water recovery tank 5 to be transported to the particle impurity filtering mechanism 3.

[0057] A heat transfer mechanism is installed on the vertical pipe 201, and the heat transfer mechanism includes a heat dissipation copper sheet 203 installed on the inner wall of the vertical pipe 201. The heat dissipation copper sheet 203 is arranged in a plurality of groups in a vertical direction, and each row of heat dissipation copper sheets 203 is arranged in a plurality of groups with equal distances and circumferential distribution, and the two rows of heat dissipation copper sheets 203 distributed up and down are staggered. When the exhaust gas is discharged from the diesel engine, it has a relatively high temperature. When the exhaust gas is filtered by the particle impurity filtering mechanism 3 inside the intake pipe 202, water will adhere to the surface of the filter plate 302 during the self-cleaning process, thereby achieving a preliminary cooling of the exhaust gas. When the exhaust gas enters the vertical pipe 201 and reacts with the reducing agent sprayed by the reducing agent spraying mechanism 4, the heat dissipation copper sheet 203 can further absorb heat from the exhaust gas through the arrangement of a large number of heat dissipation copper sheets 203 inside the vertical pipe 201, thereby achieving a rapid cooling of the exhaust gas. The heat dissipation copper sheet 203 is arranged to be tilted downward from the outside to the inside, so that when the harmful substances in the tail gas react with the reducing agent to generate water, the water will flow downward along the heat dissipation copper sheet 203 and finally be collected in the water recovery box 5. The staggered arrangement of the heat dissipation copper sheet 203 can ensure that the flow of the water is not disturbed. At the same time, when the water flows on the surface of the heat dissipation copper sheet 203, the surface of the heat dissipation copper sheet 203 becomes wet. Since the specific heat capacity of water is high, it can absorb more heat, so that the temperature of the surface of the heat dissipation copper sheet 203 after absorbing heat is more uniform, thereby improving the cooling effect of the heat dissipation copper sheet 203 on the tail gas.

[0058] When the exhaust gas passes through the pretreatment pipe 2 and enters the dehumidification pipe 6, the harmful substances and solid particle impurities in the exhaust gas are removed, but the exhaust gas absorbs water in the vertical pipe 201 to increase the humidity. A water absorption mechanism is installed inside the dehumidification pipe 6, and the water absorption mechanism includes a water absorption material 601 installed on the inner wall of the dehumidification pipe 6, so that when the exhaust gas passes through the water absorption material 601 and enters the drying pipe 7, it will pass through the water absorption material 601, and the water in the exhaust gas can be absorbed by the water absorption material 601, so as to further achieve the drying treatment of the exhaust gas and reduce the moisture in the exhaust gas when it is discharged.

[0059] The lower end surface of the dehumidification tube 6 is provided with an opening and the opening is located below the water-absorbing material 601. Two groups of fixed rods 602 are fixedly connected to the lower end surface of the dehumidification tube 6. The two groups of fixed rods 602 are located on both sides of the opening below the dehumidification tube 6. The surfaces of the two groups of fixed rods 602 are fitted with a pressing plate 603. The surface of the pressing plate 603 is fixedly connected with a pressing block 604. The pressing block 604 is fitted and installed in the opening below the dehumidification tube 6. When the water-absorbing material 601 dries the exhaust gas passing through, it absorbs the water in the exhaust gas and becomes moist. An eccentric wheel 802 is fixedly connected to the output shaft of the driving motor B801. The eccentric wheel 802 is located below the pressing plate 603 and contacts the surface of the pressing plate 603. When the driving motor B801 is turned on, the driving motor B801 will drive the eccentric wheel 802 to rotate, further pushing the pressing plate 603 to slide on the fixed rod 602, so that the pressing plate 603 will be inserted into the interior of the dehumidification tube 6 and squeeze the water-absorbing material 601, so as to discharge the water absorbed in the water-absorbing material 601, thereby resetting the water absorption capacity of the water-absorbing material 601 and improving the drying effect of the dehumidification tube 6 on the tail gas. In addition, the thickness of the pressing block 604 is greater than the inner diameter thickness of the dehumidification tube 6, so that when the pressing block 604 is inserted into the dehumidification tube 6, the opening below the dehumidification tube 6 will not leak the water squeezed out of the water-absorbing material 601. The dehumidification tube 6 is set to a "V"-shaped structure, and the lower end of the dehumidification tube 6 and the connection point of the vertical pipe 201 are the lowest ends, and gradually extend upward, so that after the water in the water-absorbing material 601 is squeezed out, it will flow back into the vertical pipe 201 and merge into the water recovery box 5 to collect the water. A spring 605 is sleeved on the surface of the fixed rod 602, one end of the spring 605 is connected to the lower end surface of the dehumidification tube 6, and the other end of the spring 605 is connected to the upper surface of the pressing plate 603. When the fixed rod 602 rotates, it pushes the pressing plate 603 to slide linearly on the fixed rod 602 and squeeze the spring 605. The displacement of the pressing plate 603 can be reset by the elastic force of the spring 605, so as to prevent the pressing block 604 from squeezing the water-absorbing material 601 excessively, thereby blocking the passage of the exhaust gas in the dehumidification tube 6.

[0060] The drying tube 7 is sleeved and installed on the outer surface of the vertical pipe 201. The surface of the drying tube 7 is fixedly connected with the exhaust pipe 701, and one end of the exhaust pipe 701 passes through the interior of the treatment box shell 1. When the exhaust gas enters the drying tube 7 through the dehumidification pipe 6, it will eventually be discharged from the exhaust pipe 701. One end of the heat dissipation copper sheet 203 passes through the vertical pipe 201 and is inserted into the interior of the drying tube 7. When the heat dissipation copper sheet 203 absorbs heat in the exhaust gas, the heat dissipation copper sheet 203 will transfer the heat to the drying tube 7, further achieving drying in the drying tube 7. When the exhaust gas dried in the dehumidification pipe 6 enters the drying tube 7, it will be further dried, thereby achieving full removal of moisture in the exhaust gas.

[0061] The exhaust pipe 701 is set to be circular, and the intake pipe 202 is set to be square, so as to facilitate the input and output discrimination of the exhaust gas outside the processing box shell 1.

[0062] Based on the above-mentioned low-speed diesel engine exhaust pretreatment equipment, this scheme also proposes a low-speed diesel engine exhaust pretreatment method, comprising the following steps:

[0063] Step 1: Connect the pretreatment pipe 2 to the exhaust port of the diesel engine so that the exhaust gas emitted by the diesel engine enters the pretreatment pipe 2;

[0064] Step 2: When the exhaust gas flows into the pretreatment pipe 2, it will pass through the particle impurity filtering mechanism 3 and the reducing agent spraying mechanism 4 in sequence. The particle impurity filtering mechanism 3 can capture the solid particle impurities in the exhaust gas, and the reducing agent spraying mechanism 4 can spray the reducing agent into the pretreatment pipe 2, so that the harmful substances in the exhaust gas react with the reducing agent to achieve the removal of the harmful substances, and the exhaust gas will be cooled at the same time;

[0065] Step 3: The water generated in the tail gas after the reaction with the reducing agent will enter the water recovery tank 5, and the tail gas after the reaction will enter the drying tube 7 through the dehumidification tube 6. The water will be removed when the tail gas passes through the dehumidification tube 6, and will be further dried when passing through the drying tube 7, and finally discharged safely through the exhaust pipe 701;

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-speed diesel engine exhaust pretreatment device, comprising a treatment box housing (1), characterized in that: The treatment box shell (1) is internally installed with a pretreatment pipe (2), a dehumidification pipe (6), a drying pipe (7) and an exhaust pipe (701) which are connected in sequence, wherein the pretreatment pipe (2) is used to communicate with the exhaust port of the diesel engine, the pretreatment pipe (2) is provided with a particle impurity filtering mechanism (3) and a reducing agent spraying mechanism (4), the treatment box shell (1) is provided with a water liquid recovery tank (5) which is connected with the pretreatment pipe (2) and is used to collect water liquid generated by the operation of the reducing agent spraying mechanism (4), the dehumidification pipe (6) is provided with a water absorption mechanism, the drying pipe (7) is coaxially sleeved on the outer wall of the pretreatment pipe (2), and a heat transfer mechanism for transferring heat in the pretreatment pipe (2) to the drying pipe (7) is provided on the pipe wall of the pretreatment pipe (2), and the exhaust pipe (701) is used to discharge the treated exhaust gas.

2. The low-speed diesel engine exhaust pretreatment equipment according to claim 1, characterized in that: The pretreatment pipe (2) comprises a vertical pipe (201) installed in the treatment box shell (1), a connected air intake pipe (202) is installed on the vertical pipe (201), one end of the air intake pipe (202) passes through the interior of the treatment box shell (1), and the particle impurity filtering mechanism (3) is installed inside the air intake pipe (202).

3. The low-speed diesel engine exhaust pretreatment device according to claim 2, characterized in that: The particle impurity filtering mechanism (3) comprises an insertion shaft (301) inserted and installed in the air intake pipe (202), the insertion shaft (301) being arranged in a plurality of groups and distributed linearly, and the surfaces of the insertion shafts (301) are all provided with filtering plates (302).

4. The low-speed diesel engine exhaust pretreatment device according to claim 3, characterized in that: The air inlet pipe (202) is arranged in a trapezoidal shape, the opening of the air inlet pipe (202) gradually becomes larger in diameter toward one side of the vertical pipe (201), and the surface of the filter plate (302) is provided with evenly distributed capture holes (306).

5. The low-speed diesel engine exhaust pretreatment equipment according to claim 3, characterized in that: One end of the plug shaft (301) passes through the outside of the air inlet pipe (202), and a sprocket (303) is fixedly connected to the outer end surface of the plug shaft (301). Two adjacent groups of sprockets (303) are connected by a chain (304). The particle impurity filtering mechanism (3) also includes a drive motor A (305) installed inside the treatment box shell (1), and the drive motor A (305) is used to drive a plurality of groups of filter plates (302) to rotate synchronously. The particle impurity filtering mechanism (3) also includes a water tank (307) installed below the air inlet pipe (202), and the water tank (307) is connected to the air inlet pipe (202).

6. The low-speed diesel engine exhaust pretreatment device according to claim 5, characterized in that: A water delivery mechanism (8) and a water supply pipe (9) are installed inside the treatment box housing (1). The water supply pipe (9) is used to connect the water recovery box (5) and the water tank (307). The water delivery mechanism (8) is used to deliver the water in the water recovery box (5) to the water tank (307). The water delivery mechanism (8) includes a drive motor B (801) installed in the treatment box housing (1). A rotating disk (803) is fixedly connected to the output shaft of the drive motor B (801). The rotating disk A connecting shaft (804) is fixedly connected to a non-center portion of the surface of (803); a connecting rod (805) is hingedly mounted on the connecting shaft (804); a movable sealing plug rod (806) is hingedly mounted on the other end of the connecting rod (805) through the connecting shaft (804); the movable sealing plug rod (806) is inserted into the interior of the water supply pipe (9); and a one-way valve B (901) is installed inside one end of the water supply pipe (9) that is connected to the water recovery tank (5) and the particle impurity filtering mechanism (3).

7. The low-speed diesel engine exhaust pretreatment device according to claim 6, characterized in that: The water absorbing mechanism comprises a water absorbing material (601) installed on the inner wall of the dehumidification pipe (6); the lower end surface of the dehumidification pipe (6) is provided with an opening and the opening is located below the water absorbing material (601); the water absorbing mechanism also comprises a fixing rod (602) connected to the lower end surface of the dehumidification pipe (6); a pressing plate (603) and a spring (605) are installed in a sleeve matching the surface of the fixing rod (602); the surface of the pressing plate (603) is fixedly connected to the spring (605). A pressing block (604) is connected, and the pressing block (604) is inserted and installed in the opening below the dehumidification pipe (6). An eccentric wheel (802) is fixedly connected to the output shaft of the driving motor B (801), and the eccentric wheel (802) is located below the pressing plate (603) and abuts against the surface of the pressing plate (603). The dehumidification pipe (6) is configured as a "V"-shaped structure, and the lower end of the dehumidification pipe (6) and the connection point with the vertical pipe (201) are the lowest end.

8. The low-speed diesel engine exhaust pretreatment device according to claim 2, characterized in that: The reducing agent spraying mechanism (4) comprises a T-shaped tube (401) installed above the vertical tube (201), and the reducing agent spraying mechanism (4) also comprises an electric telescopic rod (403) installed on the upper inner wall of the treatment box housing (1), a piston block (404) is fixedly connected to the piston rod of the electric telescopic rod (403), and the piston block (404) is inserted into the upper end of the T-shaped tube (401), and the other two ends of the T-shaped tube (401) are respectively connected to the vertical tube (201) and the medicine box (402), and the medicine box (402) is installed inside the treatment box housing (1), and a one-way nozzle (405) is installed at one end of the T-shaped tube (401) connected to the vertical tube (201), and a one-way valve A (406) is installed at one end of the T-shaped tube (401) connected to the medicine box (402).

9. The low-speed diesel engine exhaust pretreatment device according to claim 8, characterized in that: The heat transfer mechanism comprises a heat dissipation copper sheet (203) mounted on the inner wall of the vertical tube (201); the heat dissipation copper sheet (203) is arranged in a plurality of groups arranged in a vertical direction; each row of the heat dissipation copper sheets (203) is arranged in a plurality of groups arranged in a circular distribution with equal distances; and two rows of the heat dissipation copper sheets (203) arranged in an upper and lower manner are arranged in a staggered manner; one end of the heat dissipation copper sheet (203) passes through the vertical tube (201) and is inserted into the interior of the drying tube (7).

10. The treatment method according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: connecting the pretreatment pipe (2) to the exhaust outlet of the diesel engine, so that the exhaust gas discharged by the diesel engine enters the pretreatment pipe (2); Step 2: When the exhaust gas flows into the pretreatment pipe (2), it will pass through the particle impurity filtering mechanism (3) and the reducing agent spraying mechanism (4) in sequence. The solid particle impurities in the exhaust gas are captured by the particle impurity filtering mechanism (3), and the reducing agent is sprayed into the pretreatment pipe (2) by the reducing agent spraying mechanism (4), so that the harmful substances in the exhaust gas react with the reducing agent to achieve the removal of the harmful substances. At the same time, the exhaust gas will be cooled; Step 3: The water generated in the tail gas after the reaction with the reducing agent will enter the water recovery box (5), and the tail gas after the reaction will enter the drying tube (7) through the dehumidification tube (6). The water will be removed when the tail gas passes through the dehumidification tube (6), and will be further dried when passing through the drying tube (7), and finally discharged safely through the exhaust pipe (701).

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