Gas treatment system

Abstract

The utility model provides a gas treatment system which comprises heat exchange equipment provided with a heat exchange device, and the heat exchange device is configured to be capable of reducing the temperature of gas to be treated; the spraying equipment is provided with a spraying pipe, and the spraying pipe is configured to spray water to the gas; and the odor removal equipment is provided with a filtering layer, and the filtering layer is constructed to be capable of filtering gas.

Description

Technical Field

[0001] This disclosure relates to a gas treatment system, and more particularly to a gas treatment system for exhaust gas from tobacco drying equipment. Background Technology

[0002] An airflow-type tobacco drying machine is a commonly used production equipment in cigarette manufacturing. It heats process gases in a combustion furnace, allowing heat transfer between the gases and the tobacco shreds to remove excess moisture and initiate the Maynard reaction to meet process control standards. The combustion furnace used in the drying machine typically uses natural gas or diesel fuel, generating a certain amount of exhaust gas during the heating process. Traditionally, this exhaust gas is discharged outdoors through exhaust pipes.

[0003] The expanded tobacco drying machine possesses the basic characteristics of an airflow drying machine. However, due to the high temperature required for expanding tobacco (generally above 700℃) and the large air volume, the exhaust gas produced by this combustion furnace is also quite hot (around 220℃). Because of this high exhaust gas temperature, if the exhaust gas temperature were to be reduced to below 50℃ using traditional cooling methods before being discharged into the atmosphere, a large heat exchange area would be needed, resulting in a large footprint for the cooling equipment.

[0004] Testing revealed that the exhaust gas contained pollutants such as sulfur dioxide, nitrogen oxides, and particulate matter. According to environmental regulations for atmospheric emissions, these pollutants have strict emission limits, requiring regular monitoring and data reporting to the local environmental protection department. Furthermore, the exhaust gas from the expanded tobacco drying machine also contained a certain amount of tobacco odor. Utility Model Content

[0005] To address at least one of the above problems, according to one aspect of this disclosure, a gas treatment system is provided, characterized in that the gas treatment system comprises: a heat exchange device, the heat exchange device being provided with a heat exchange apparatus configured to reduce the temperature of the gas to be treated; a spray device, the spray device being provided with a spray pipe configured to spray water onto the gas; and a deodorization device, the deodorization device being provided with a filter layer configured to filter the gas.

[0006] Therefore, the gas treatment system according to this disclosure can significantly reduce the concentrations of various pollutants, particulate matter, and odors in exhaust gas, thereby reducing environmental pollution and mitigating the impact of odors on the lives of surrounding residents. Furthermore, the gas treatment system according to this disclosure employs multi-stage cooling of the gas to be treated through heat exchange equipment and spray equipment, allowing for efficient use of space and reducing system size.

[0007] Optionally, the heat exchange device further includes a cooling liquid circuit, and the heat exchange device includes an inlet pipe, an outlet pipe, and multiple heat exchange plates, with the cooling liquid circuit in fluid communication with the heat exchange device.

[0008] Optionally, the cooling liquid circuit includes a cooling tower, which is in fluid communication with the outlet pipe and the cooling liquid source.

[0009] Optionally, the heat exchange device further includes a cleaning device configured to clean the outer surface of the heat exchange device, including a cleaning nozzle.

[0010] Optionally, the inner diameter of the casing of the spraying device gradually increases towards the outlet side.

[0011] Optionally, the bottom surface of the spraying device gradually decreases towards the outlet side.

[0012] Optionally, the spraying device is provided with a guide plate, which is configured to guide the gas to meander within the spraying device.

[0013] Optionally, the spraying equipment is equipped with a temperature sensor configured to detect the temperature of the spraying water.

[0014] Optionally, the gas handling system further includes a fan, which is configured to be frequency-controlled to stabilize the gas flow rate according to the gas pressure.

[0015] Optionally, the deodorization device further includes a water-blocking layer and a water spray pipe. The water-blocking layer is located downstream of the filter layer and the water spray pipe in the gas flow direction and is configured to remove moisture from the gas. The water spray pipe is configured to spray water onto the filter layer, which is formed into a mesh from filaments and includes multiple mesh openings. The filaments and mesh openings are configured to form a water film on the surface of the filter layer.

[0016] Optionally, the water-retaining layer includes multiple zigzag plates, forming zigzag channels between adjacent zigzag plates. Attached Figure Description

[0017] Many aspects of this disclosure will be better understood after reading the following detailed description in conjunction with the accompanying drawings, in which:

[0018] Figure 1 A schematic diagram of a gas handling system according to an embodiment of the present disclosure is shown.

[0019] Figure 2 A schematic diagram of a heat exchange device according to an embodiment of the present disclosure is shown.

[0020] Figure 3 A schematic diagram of a spraying device according to an embodiment of the present disclosure is shown.

[0021] Figure 4 A schematic diagram of a deodorizing device according to an embodiment of the present disclosure is shown. Detailed Implementation

[0022] The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments. Furthermore, the drawings are merely illustrative of embodiments and are not necessarily drawn to scale.

[0023] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. The terminology used in this specification is for describing particular embodiments only and is not intended to limit this disclosure. All terms used in this specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of brevity and / or clarity, well-known functions or structures may not be described in detail.

[0024] The following describes a gas handling system 1 according to an embodiment of the present disclosure.

[0025] like Figure 1 As shown, the gas treatment system 1 according to an embodiment of this disclosure includes a heat exchange device 100, a spray device 200, and a deodorization device 300. The gas treatment system 1 may also include a fan 400. Under the action of the fan 400, the exhaust gas EG, which is the gas to be treated, passes sequentially through the heat exchange device 100, the spray device 200, and the deodorization device 300 as indicated by arrow G, and is discharged from the deodorization device 300 to the atmosphere.

[0026] The following reference Figure 2 Describe the structure of the heat exchanger 100.

[0027] As shown in the figure, the heat exchanger 100 internally includes a heat exchange device 110 and a cooling liquid circuit 120. The heat exchange device 110 is configured to reduce the temperature of the exhaust gas. The heat exchange device 110 can be in the form of a plate heat exchanger, including a set of heat exchange plates 111. Each heat exchange plate 111 is connected to a common inlet pipe 112 and an outlet pipe 113. The cooling liquid in the cooling liquid circuit 120 flows into the heat exchange device 110 from the inlet pipe 112 as indicated by arrow W, flows over the inside of the heat exchange plates 111, and flows out of the heat exchange device 110 from the outlet pipe 113. The exhaust gas EG flows over the outside of the heat exchange plates 111 and exchanges heat with the cooling liquid inside the heat exchange plates 111, thereby reducing the temperature of the exhaust gas.

[0028] The cooling fluid circuit 120 includes a pump 121. The pump 121 causes the cooling fluid to circulate in the cooling fluid circuit 120.

[0029] Optionally, the heat exchange device 110 may include two or more sets of heat exchange plates 111, each set of heat exchange plates including an inlet pipe 112, an outlet pipe 113, and multiple heat exchange plates 111, thereby fully cooling the exhaust gas. In addition, an inspection door 114 may be provided near each set of heat exchange plates 111 to facilitate subsequent inspection and maintenance of the heat exchange plates 111, ensuring the continuous and reliable operation of the system.

[0030] Optionally, the cooling liquid circuit 120 may include a cooling tower 122. After exchanging heat with the exhaust gas to raise its temperature, the cooling liquid flowing from the outlet pipe 113 flows into the cooling tower 122. The cooling tower 122 is in fluid communication with the cooling liquid source WS, and the cooling liquid flowing from the outlet pipe 113 mixes with the freshly replenished cooling liquid in the cooling tower 122 to lower its temperature in preparation for circulation for the next cooling cycle.

[0031] Optionally, the heat exchanger 100 also includes a cleaning device 130. The cleaning device 130 is configured to clean the outer surface of the heat exchanger and includes a cleaning nozzle 131 located above the heat exchanger 110. When the gas handling system is shut down, the cleaning nozzle 131 periodically sprays cleaning liquid CW onto the heat exchanger plates 111 to clean the outer surface of the heat exchanger plates 111, thereby preventing particles carried in the exhaust gas from adhering to the outer surface of the heat exchanger plates 111 and causing a decrease in heat exchange efficiency.

[0032] Alternatively, at least one of the cooling liquid and the cleaning liquid can be water, thereby reducing maintenance costs and preventing secondary pollution.

[0033] The following reference Figure 3 Describe the structure of the spraying equipment 200.

[0034] like Figure 3 As shown, the spraying device 200 internally includes a spray pipe 210, a water tank 220, and a pump 230. The spray pipe 210 is configured to spray water onto the gas. The spray pipe 210 is located at the top of the spraying device 200 and may include multiple atomizing nozzles 211. The water tank 220 is located at the bottom of the spraying device 200. Water flows from the water tank 220 to the spray pipe 210 under the action of the pump 230, and is sprayed down onto the exhaust gas from the atomizing nozzles 211, thereby continuously cooling the exhaust gas while removing most of the pollutants and soot particles from it.

[0035] Optionally, the casing of the spray device 200 is configured such that its inner diameter gradually increases towards the outlet side, thereby gradually increasing the volume of the spray device 200 towards the outlet side. This configuration causes the exhaust gas velocity to gradually decrease towards the outlet side, increasing the spraying time and improving the cooling and dust removal effect on the exhaust gas. Furthermore, the increased volume helps balance system pressure changes, preventing increased local resistance caused by spraying from affecting the stability of the flue gas flow. Optionally, the bottom surface of the spray device 200 gradually decreases towards the outlet side. This configuration, while gradually increasing the volume, also facilitates the collection of sprayed water, preventing water accumulation at the bottom.

[0036] Optionally, the spraying device 200 further includes one or more guide plates 240. The guide plates 240 are disposed inside the spraying device 200 and configured to guide the exhaust gas to meander within the spraying device 200, increasing the spraying time of the exhaust gas and further improving the cooling and dust removal effect on the exhaust gas. Optionally, the guide plates 240 may be arranged vertically.

[0037] Optionally, the spraying equipment 200 is equipped with a temperature sensor 250, which is used to detect the temperature of the circulating water. When the water temperature is too high, the spraying water is replaced by draining and replenishing water to maintain the cooling and dust removal effect.

[0038] The exhaust gas flowing from the spray device 200 flows into the deodorization device 300 via the fan 400. A pressure detector can be installed in the exhaust gas duct to detect the pressure of the exhaust gas. Based on the difference between the preset pressure value and the detected pressure value, the fan 400 is frequency-controlled to keep the exhaust gas flow in the duct stable.

[0039] The following reference Figure 4 Describe the structure of the deodorization device 300.

[0040] like Figure 4 As shown, the deodorizing device 300 internally comprises a filter layer 310, a water-blocking layer 320, a water tank 330, a water pump 340, a water spray pipe 350, an air inlet 360, and an air outlet 370. The filter layer 310 is positioned above the air inlet 360, the water spray pipe 350 is positioned above the filter layer 310, the water-blocking layer 320 is positioned above the water spray pipe 350, and the air outlet 370 is positioned above the water-blocking layer 320. The water tank 330 is located at the bottom of the deodorizing device 300. Water flows from the water tank 330 to the water spray pipe 350 under the action of the water pump 340, is sprayed from the water spray pipe 350 onto the filter layer 310, passes through the filter layer 310, and then flows into the water tank 330 at the bottom of the deodorizing device 300 for circulation.

[0041] The filter layer 310 is configured to filter exhaust gas. In this embodiment, the filter layer 310 is composed of filaments 311 arranged in a mesh. The filaments 311 form a plurality of mesh openings 312. The plurality of mesh openings 312 are connected to each other by the filaments 311. The mesh openings 312 can be hexagonal or other shapes such as circles, polygons, etc. The size and number of the filaments 311 and mesh openings 312 are designed such that when water is sprayed from the spray pipe 350 onto the filter layer 310, a water film is formed on the surface of the filter layer 310. Optionally, the filaments 311 are made of plastic to reduce weight and save costs; however, the filaments 311 can also be made of other materials such as metal.

[0042] Optionally, the water spray pipe 350 may also be equipped with atomizing nozzles to enhance the film-forming effect of water on the surface of the filter layer 310.

[0043] Optionally, the water spray pipe 350 can be set on the lower side or the upper and lower sides of the filter layer 310. The water spray pipe 350 set on the lower side of the filter layer 310 sprays water upward toward the filter layer 310 to facilitate the formation of a water film on the lower surface of the filter layer 310.

[0044] The water-retaining layer 320 is configured to remove moisture from the exhaust gas. In this embodiment, the water-retaining layer 320 includes multiple zigzag (e.g., Z-shaped) plates, forming zigzag channels between adjacent zigzag plates. As the exhaust gas passes through the zigzag channels, the water vapor contained in the exhaust gas condenses into tiny water droplets upon encountering the plates and falls off the water-retaining layer 320. Therefore, the moisture content of the exhaust gas passing through the water-retaining layer 320 is significantly reduced.

[0045] Alternatively, the water barrier 320 can be made of a breathable, absorbent material to absorb moisture from the exhaust gas. However, in such a configuration, the absorbent material needs to be replaced periodically, increasing maintenance costs.

[0046] The working process of gas handling system 1 is described below.

[0047] Under the action of the fan 400, the exhaust gas EG, which is the gas to be treated, flows into the heat exchange device 100 as shown by arrow G. After passing through the heat exchange device 110, it exchanges heat with the cooling liquid in the heat exchange plate 111 at each group of heat exchange plates 111, which reduces the temperature of the exhaust gas. Then the exhaust gas flows into the spray device 200.

[0048] Inside the spraying device 200, the exhaust gas EG is washed by water sprayed from the spray pipe 210, which further reduces the temperature of the exhaust gas, and most of the pollutants and dust particles carried in the exhaust gas are removed by the spraying water. Then the exhaust gas flows into the deodorization device 300.

[0049] After the exhaust gas flows into the deodorization device 300 through the inlet 360, it rises due to its higher temperature and passes through the filter layer 310. There, the gas molecules in the exhaust gas come into full contact with the water molecules in the water film on the filter layer 310, causing pollutants and odor components in the exhaust gas to dissolve in the water. The odor-removed exhaust gas continues to flow upwards through the water-blocking layer 320, where the water vapor carried in the exhaust gas is removed. Finally, the odor-removed exhaust gas is discharged into the atmosphere through the outlet 370.

[0050] According to the gas processing system disclosed herein, the gas to be processed is cooled in multiple stages through heat exchange equipment and spray equipment, making reasonable use of space layout and reducing system size.

[0051] After the exhaust gas passes through the gas treatment system disclosed herein, the concentrations of various pollutants, particulate matter, and odors in the exhaust gas are greatly reduced, which can reduce environmental pollution and mitigate the impact of odors on the lives of surrounding residents.

[0052] The embodiments of this disclosure have been described above, but it should be understood that this disclosure is not limited thereto. Various modifications will be conceived by those skilled in the art without departing from the scope of this disclosure.

[0053] For example, in the embodiments described above, the heat exchange device 110 uses a plate heat exchanger; however, it is conceivable that the heat exchange device 110 may use other forms of heat exchangers, such as coil heat exchangers, mixing heat exchangers, etc.

[0054] For example, in the embodiments described above, the heat exchanger 100 has an internal cooling liquid circuit. However, it is conceivable that cooling liquid can be supplied to the heat exchanger 100 through a cooling liquid circuit located outside the gas processing system.

[0055] For example, in the embodiments described above, both the spraying device 200 and the deodorizing device 300 have their own internal water sources. However, it is conceivable that the spraying device 200 and the deodorizing device 300 could be supplied with water by a water source located outside the gas treatment system.

[0056] For example, in the embodiments described above, the filter layer 310, the water spray pipe 350, and the water barrier layer 320 are used to remove odor components contained in the exhaust gas. However, it is conceivable that the odor components could be removed by using a filter layer made of an adsorbent material such as activated carbon, thereby eliminating the need for the water spray pipe 350 and the water barrier layer 320. However, this would require periodic replacement of the adsorbent material, increasing maintenance costs.

[0057] For example, it is conceivable to install various valves and sensors in the heat exchanger 100, the spraying equipment 200, and the deodorizing equipment 300, and to automatically control them through a control system. For example, temperature sensors could be installed in the heat exchanger 100 and the spraying equipment 200 to monitor the temperature of the circulating water, and to replace the sensors when the water temperature exceeds a threshold, in order to ensure the cooling effect.

[0058] For example, in the embodiments described above, the gas flows upward in the deodorizing device 300. However, it is conceivable that the gas may also flow in other directions (e.g., to the right), as long as the water-blocking layer is located downstream of the filter layer and the spray pipe in the direction of gas flow.

[0059] Those skilled in the art will understand that various changes and modifications can be made to the exemplary embodiments of this disclosure without departing from the spirit and scope of this disclosure. Therefore, all changes and modifications are included within the scope of protection of this disclosure as defined by the claims. This disclosure is defined by the appended claims, and equivalents of those claims are also included.

Claims

1. A gas treatment system, characterized by, The gas treatment system comprises: a heat exchange device configured to reduce the temperature of the gas to be treated; a spraying device configured to spray water to the gas; an odor removal device configured to filter the gas, wherein the heat exchange device further comprises a cleaning device configured to clean the outer surface of the heat exchange device.

2. The gas treatment system of claim 1, wherein, The heat exchange device further comprises a cooling liquid circuit, and the heat exchange device comprises an inlet pipe, an outlet pipe and a plurality of heat exchange plates, and the cooling liquid circuit is in fluid communication with the heat exchange device.

3. The gas treatment system of claim 2, wherein, The cooling liquid circuit comprises a cooling tower in fluid communication with the outlet pipe and a cooling liquid source.

4. The gas treatment system of claim 1, wherein, The inner diameter of the housing of the spraying device gradually increases towards the outlet side.

5. The gas treatment system of claim 4, wherein, The bottom surface of the spraying device gradually decreases towards the outlet side.

6. The gas treatment system of claim 1, wherein, The spraying device is provided with a flow guide plate configured to guide the gas to flow in a meandering manner inside the spraying device.

7. The gas treatment system of claim 1, wherein, The spraying device is provided with a temperature sensor configured to detect the temperature of the water for spraying.

8. The gas treatment system of claim 1, wherein, The gas treatment system further comprises a fan configured to be frequency-adjusted according to the gas pressure to stabilize the flow of the gas.

9. The gas treatment system of claim 1, wherein, The odor removal device further comprises a water blocking layer and a water spraying pipe, the water blocking layer is located downstream of the filter layer and the water spraying pipe in the gas flow direction and is configured to remove the water in the gas, the water spraying pipe is configured to spray water to the filter layer, the filter layer is formed into a mesh shape by wires and comprises a plurality of mesh holes, and the wires and the mesh holes are configured to form a water film on the surface of the filter layer.

10. The gas treatment system of claim 9, wherein, The water blocking layer comprises a plurality of fold line-shaped plates, and a fold line-shaped channel is formed between adjacent fold line-shaped plates.

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