TWI846569B - Thermal exhaust gas treatment system - Google Patents

Abstract

A thermal exhaust gas treatment system, which includes an intermediate device, a thermal exhaust gas treatment device, and a gas-liquid mixing device. The intermediate device is capable of conveying thermal exhaust gas and temporarily storing processing liquid. The thermal exhaust gas treatment device is located above the intermediate device, and it purifies the thermal exhaust gas through a filter and liquid spraying device, with the purified gas being discharged through an exhaust device. The conveying pipeline of the gas-liquid mixing device is able to transport the processing liquid stored in the intermediate device to the thermal exhaust gas treatment device. As a result, this invention can reduce or eliminate the production of oil mist, harmful gases, dust, and odors generated during the metal thermal treatment process, thereby reducing or eliminating discomfort and aversion to air odors and pollution for employees in the workplace and surrounding residents.

Description

Hot exhaust gas treatment system

The present invention relates to a treatment system, and more particularly to a hot waste gas treatment system.

The metal materials used in the metal processing industry are usually coated with a layer of anti-rust oil, which is a light yellow liquid with a specific gravity of 0.68-0.85kg/L at room temperature. It has strong anti-rust and salt mist sealing capabilities and can form a dense protective film on the surfaces of different metals such as copper and iron. In the production process, in order to maintain the elasticity of metal materials, they need to undergo heat treatment (normalizing, annealing, quenching, tempering, and surface hardening, etc.) to improve the material structure and enhance the material performance. The heat energy generally uses electricity or gas, so the air pollutants generated in the heat treatment process are not those generated by combustion, but oil mist in vaporized, misty or evaporative form due to high heat.

It is observed that a small number of metal processing companies in the country have installed local exhaust hoods at the source, and then collected and treated the exhaust gas with filtering, electrostatic, or water washing equipment. When using filtering equipment to treat exhaust gas, if there are a lot of oil droplets or water vapor, its service life will be shortened. If the filter material is not replaced in time, it may cause secondary pollution. When using electrostatic equipment to treat waste gas, attention must be paid to the type of solvent in the anti-rust oil. If there is flammable gas, it must be checked whether it is within the explosion limit, and the collector plate must be cleaned regularly, otherwise it will shorten the service life of the collector plate or may cause a fire (explosion). Therefore, electrostatic equipment is only suitable for conditions with low to medium oil smoke or oil smoke particles with larger particle size and low odor. When using water washing equipment to treat waste gas, it is noisy and wastes water resources. Metal processing companies generally only install local exhaust hoods to extract oil mist waste gas outside the factory without installing any treatment equipment. This is even accompanied by excessive pressure loss due to the long pipeline, resulting in insufficient exhaust volume and inability to exert the collection and exhaust functions.

Heat treatment causes the surface anti-rust oil of metal products to produce two major types of volatile organic compounds (VOCs) and gaseous pollutants. It is currently known that VOCs have a great impact on the environment. When the concentration of volatile organic compounds in the environment is too high, it will cause health and safety problems. Health problems include headaches, nausea, vomiting, limb weakness and even convulsions, coma, memory loss, etc. In addition, VOCs are carcinogenic and mutagenic. Exposure to them for more than a certain period of time will harm the liver, kidneys, or central nervous system of the human body. Many countries have set emission standards for volatile organic substances in industrial waste gas; safety issues include pollutants or dust particles being flammable. When exposed to high-temperature heat sources, flames or charged dust particles in the surrounding area, under certain concentration, temperature and pressure conditions, they may cause fire (deflagration) or explosion (gas explosion, dust explosion), posing a threat to safety. Gaseous pollutants are odor source substances, and their main chemical components are carbon, hydrogen, oxygen, etc. Gasoline, diesel and petroleum-based solvents are hydrocarbons, containing unsaturated, aromatic and sulfur-containing compounds. Oxygen-containing hydrocarbons include most organic solvents, such as acetone, isopropyl alcohol, butanone, ethyl acetate, etc., which are mostly aromatic.

There are various substances or methods for removing VOCs, but most of them still have their limitations.

To solve the above problems, the present invention discloses a thermal exhaust gas treatment system, which can reduce or eliminate the oil mist, harmful gases, dust, and odor generated in the metal heat treatment process, thereby reducing or eliminating the discomfort and disgust of employees in the workplace and surrounding residents due to air odor and pollution.

To achieve the above-mentioned purpose, an embodiment of the present invention provides a hot exhaust gas treatment system, which includes an intermediate device, a hot exhaust gas treatment device and a gas-liquid mixing device. The intermediate device includes a stagnation temporary storage space, an air delivery hole and a water delivery hole. The stagnation temporary storage space includes a hot exhaust gas stagnation area and a treatment liquid temporary storage area. The hot exhaust gas stagnation area is arranged at the top of the stagnation temporary storage space, and the treatment liquid temporary storage area is arranged at the bottom of the stagnation temporary storage space. The air delivery hole is penetrated on one side of the intermediate device and coupled to a hot exhaust gas generating device. The air delivery hole is used to allow the hot exhaust gas generating device to deliver the hot exhaust gas. A hot waste gas is introduced into the hot waste gas retention area, a water delivery hole is penetrated on one side of the middle device and coupled to a water delivery device, and the water delivery hole is used to allow the water delivery device to deliver water to the treatment liquid temporary storage area; the hot waste gas treatment device is arranged above the middle device, and the hot waste gas treatment device includes a hot waste gas treatment space, a plurality of partitions, a plurality of filter elements, a plurality of spray elements, an air inlet, a liquid discharge hole and an exhaust element, and the plurality of partitions are arranged in the hot waste gas treatment space at intervals, and each partition has a flow hole, and the flow holes of two adjacent partitions are arranged diagonally to each other, and the plurality of filter elements and the plurality of The partitions are arranged in a staggered manner, each spraying element is arranged on the top side of each filter element and sprays a treatment liquid, the air inlet is penetrated at the bottom of the hot waste gas treatment device, and allows the hot waste gas to flow from the hot waste gas retention area into the hot waste gas treatment space, the liquid discharge hole is penetrated at the bottom of the hot waste gas treatment device, and allows the treatment liquid to flow from the hot waste gas treatment space into the treatment liquid temporary storage area, and the exhaust element is penetrated at the top of the hot waste gas treatment device; the gas-liquid mixing device includes a gas generator, a transmission pipeline and a pressure pump, the gas generator is arranged at the top of the hot waste gas treatment device, and is used to generate A treatment gas is generated, and the delivery pipeline includes a liquid input part, a liquid output part and a gas input part. The liquid input part is arranged at one end of the delivery pipeline, the liquid input part is coupled to the treatment liquid temporary storage area, and inputs the treatment liquid into the delivery pipeline; the liquid output part is arranged at the other end of the delivery pipeline, the liquid output part is coupled to the spray part, and outputs the treatment liquid to the spray part. The gas input part is arranged between the liquid input part and the liquid output part, and is coupled to the gas generator. The pressure pump is arranged between the liquid input part and the gas input part to pressurize the treatment liquid.

Thus, the present invention can reduce or eliminate the oil mist, harmful gas, dust, and odor generated in the metal heat treatment process, thereby reducing or eliminating the discomfort and disgust of workers in the workplace and surrounding residents with air odor and pollution.

Furthermore, the hot exhaust gas treatment device of the present invention is modularly designed, and the user can adjust the number of filters and the positive ion concentration of the treatment liquid according to the amount of hot exhaust gas generated by the connected hot exhaust gas generating device, thereby improving the flexibility of use and the hot exhaust gas treatment efficiency of the present invention and reducing the hot exhaust gas treatment cost.

In order to facilitate the explanation of the central idea of the present invention in the above-mentioned creative content column, a specific embodiment is used for expression. It should be noted that various objects in the embodiment are drawn in proportions suitable for enumeration and description, rather than in proportions of actual elements.

Please refer to FIG. 1 to FIG. 6 , which disclose a hot exhaust gas treatment system 100 of an embodiment of the present invention, which is connected to a hot exhaust gas generating device 200, and the present invention is used to purify the hot exhaust gas generated by the hot exhaust gas generating device 200. The present invention includes an intermediate device 10, a hot exhaust gas treatment device 20, a gas-liquid mixing device 30 and an electronic control device 40.

The intermediate device 10 includes a stagnation temporary storage space 11, an air delivery hole 12, and a water delivery hole 13. The stagnation temporary storage space 11 includes a hot exhaust gas stagnation area 111 and a treatment liquid temporary storage area 112. The hot exhaust gas stagnation area 111 is arranged at the top of the stagnation temporary storage space 11. The hot exhaust gas stagnation area 111 can be used for the excess hot exhaust gas to stay; the treatment liquid temporary storage area 112 is arranged at the bottom of the stagnation temporary storage space 11. The treatment liquid temporary storage area 112 can temporarily store the treatment liquid. The treatment liquid carries positive ions and can be used To purify the hot exhaust gas; an air delivery hole 12 is provided on one side of the intermediate device 10 and coupled to the hot exhaust gas generating device 200, and the air delivery hole 12 is used to allow the hot exhaust gas generating device 200 to input the hot exhaust gas to the hot exhaust gas retention area 111; a water delivery hole 13 is provided on one side of the intermediate device 10 and coupled to a water delivery device 300, and the water delivery hole 13 is used to allow the water delivery device 300 to deliver water to the treatment liquid temporary storage area 112.

As shown in FIGS. 2 to 4 , in the embodiment of the present invention, the intermediate device 10 further includes a first cover plate 14, and the first cover plate 14 selectively closes the stagnant temporary storage space 11. When the hot exhaust gas treatment system 100 is in a closed state, the user can open the first cover plate 14 to check the use status of the stagnant temporary storage space 11 and clean the stagnant temporary storage space 11.

As shown in FIG. 2 to FIG. 4 , in the embodiment of the present invention, the intermediate device 10 further includes a row of drainage holes 15 , and the drainage holes 15 are disposed through the bottom of the intermediate device 10 . When the user cleans the stagnant temporary storage space 11 , pollutants in the stagnant temporary storage space 11 can be discharged through the drainage holes 15 .

As shown in FIGS. 2 to 4 , in the embodiment of the present invention, the intermediate device 10 further includes a liquid level detector 16, which is disposed in the treatment liquid temporary storage area 112 and coupled to the electronic control device 40. The liquid level detector 16 is used to detect the height of the treatment liquid in the treatment liquid temporary storage area 112. When the height of the treatment liquid is lower than a standard height, the liquid level detector 16 will send a shutdown signal to the electronic control device 40 to shut down the hot exhaust gas treatment system 100 and allow the user to control the water supply device 300 to replenish the treatment liquid temporary storage area 112 with water. In addition, in other embodiments, the liquid level detector 16 can also send a liquid level warning signal to the electronic control device 40, and the electronic control device 40 sends a water replenishment signal to the water delivery device 300, so that the water delivery device 300 automatically replenishes the treatment liquid temporary storage area 112 with water.

The hot waste gas treatment device 20 is arranged above the intermediate device 10. The hot waste gas treatment device 20 includes a hot waste gas treatment space 21, a plurality of partitions 22, a plurality of filter elements 23, a plurality of spray elements 24, an air inlet 25, a liquid discharge hole 26 and an exhaust element 27. The plurality of partitions 22 are arranged in the hot waste gas treatment space 21 at intervals, and each partition 22 has a flow hole 221. The flow holes 221 of two adjacent partitions 22 are arranged diagonally to each other, so as to prolong the flow time of the hot waste gas in the hot waste gas treatment space 21, so that the hot waste gas can be discharged in the hot waste gas treatment space 21. The hot exhaust gas is indeed purified; a plurality of filters 23 and a plurality of baffles 22 are arranged in a staggered manner, and the filters 23 filter the hot exhaust gas. The number of filters 23 can be increased or decreased according to user needs; each sprayer 24 is correspondingly arranged on the top side of each filter 23, and sprays the treatment liquid so that the treatment liquid purifies the hot exhaust gas.

The main purpose of the filter 23 is to allow the treatment liquid sprayed by the spray element 24 to form a water curtain, so as to purify the hot exhaust gas by the treatment liquid in the shape of a water curtain, and the filter 23 itself can also further filter the hot exhaust gas to improve the purification efficiency of the hot exhaust gas. The filter 23 is a high-density distributed multi-angle filter material, which can be a three-dimensional structure made of paper, plastic, glass fiber, metal plate or ceramic filling material.

Continuing from the above, the air inlet 25 is provided at the bottom of the hot waste gas treatment device 20, and allows the hot waste gas to flow from the hot waste gas retention area 111 into the hot waste gas treatment space 21 for subsequent purification treatment. The air inlet 25 protrudes upward to a certain height, thereby preventing the treatment liquid from flowing out of the air inlet 25; the liquid leakage hole 26 is provided at the bottom of the hot waste gas treatment device 20, The treatment liquid is allowed to flow from the hot waste gas treatment space 21 into the treatment liquid temporary storage area 112 so that the treatment liquid can be continuously used. The treatment liquid will have a basic water level at the bottom of the hot waste gas treatment space 21 to prevent the hot waste gas from entering from the liquid leakage hole 26. The exhaust member 27 is installed on the top of the hot waste gas treatment device 20 to discharge the purified gas. Among them, the exhaust member 27 is a negative pressure exhaust member. The exhaust member 27 can make the hot waste gas continuously flow from the hot waste gas retention area 111 into the hot waste gas treatment space 21 for purification through the pressure difference, and discharge the purified gas.

As shown in Figures 2, 3 and 5, in the embodiment of the present invention, a plurality of drainage portions 222 are recessed at the bottom of each partition 22, and the plurality of drainage portions 222 are arranged at intervals. The drainage portions 222 can assist and accelerate the speed at which the treatment liquid flows from the hot exhaust gas treatment space 21 into the treatment liquid temporary area 112, thereby preventing the treatment liquid from being retained in the hot exhaust gas treatment space 21.

As shown in FIG. 2 , FIG. 3 and FIG. 5 , in the embodiment of the present invention, a pad 28 is provided at the bottom of each filter element 23 , and the pad 28 can raise the filter element 23 so that the treatment liquid can be discharged smoothly from the filter element 23 and increase the speed at which the treatment liquid leaves the filter element 23 .

As shown in FIG. 2 , FIG. 3 and FIG. 5 , in the embodiment of the present invention, the hot exhaust gas treatment device 20 further includes a second cover plate 29 , which selectively closes the hot exhaust gas treatment space 21 . The user can selectively remove the second cover plate 29 to replace the filter element 23 in the hot exhaust gas treatment space 21 .

The gas-liquid mixing device 30 includes a gas generator 31, a delivery pipeline 32 and a pressure pump 33. The gas generator 31 is disposed at the top of the hot exhaust gas treatment device 20 and is used to generate a treatment gas, which can be mixed with a liquid to form the treatment liquid, wherein the treatment gas is ozone or chlorine dioxide; the delivery pipeline 32 includes a liquid input part 321, a liquid output part 322 and a gas input part 323, the liquid input part 321 is disposed at one end of the delivery pipeline 32, the liquid input part 321 is coupled to the treatment liquid temporary storage area 112, and inputs the treatment liquid into the gas input part 323. The treatment liquid is delivered to the delivery pipeline 32; the liquid output part 322 is arranged at the other end of the delivery pipeline 32, the liquid output part 322 is coupled to the spray part 24, and outputs the treatment liquid to the spray part 24; the gas input part 323 is arranged between the liquid input part 321 and the liquid output part 322, and is coupled to the gas generator 31, the gas input part 323 inputs the treatment gas into the delivery pipeline 32, so that the treatment gas and the liquid in the delivery pipeline 32 are mixed with each other.

Continuing from the above, the pressure pump 33 is disposed between the liquid input part 321 and the gas input part 323, and the pressure pump 33 is used to pressurize the processing liquid so that the processing liquid can be transported to the spraying part 24 and sprayed into the hot exhaust gas processing space 21. In this embodiment of the present invention, there are a plurality of pressure pumps 33, and the plurality of pressure pumps 33 can pressurize the processing liquid in turn to avoid the problem of overload of a single pressure pump 33.

As shown in FIGS. 1 to 6 , the following is an explanation of the actual operation sequence of the present invention: (1) the water delivery device 300 delivers appropriate water to the treatment liquid temporary storage area 112, and the hot exhaust gas generating device 200 delivers the hot exhaust gas to the hot exhaust gas retention area 111; (2) the pressure pump 33 delivers water to the delivery pipeline 32, and the gas generator 31 delivers the treatment gas to the delivery pipeline 32, so that the water and the treatment gas are mixed to form the treatment liquid; (3) the treatment liquid is The hot exhaust gas is transported to the spraying element 24 through the transport pipeline 32 and sprayed into the hot exhaust gas treatment space 21. The hot exhaust gas flows from the hot exhaust gas retention area 111 into the hot exhaust gas treatment space 21 through the pressure difference generated by the exhaust element 27, thereby purifying the hot exhaust gas through the treatment liquid and the filter element 23. (4) The exhaust element 27 discharges the purified gas, and the treatment liquid flows into the treatment liquid temporary storage area 112 through the liquid discharge hole 26, so that the treatment liquid can be circulated.

Among them, although the positive ion concentration of the treatment liquid will decrease after the purification of the hot exhaust gas, the treatment liquid can be mixed with the treatment gas again in the transport pipeline 32 to increase the positive ion concentration. Therefore, the treatment liquid can continue to purify the hot exhaust gas, thereby achieving the effect of recycling water resources.

The electronic control device 40 is coupled to the exhaust component 27 , the gas generator 31 and the pressure pump 33 . The electronic control device 40 is used to control the operation of the exhaust component 27 , the gas generator 31 and the pressure pump 33 .

In addition, the present invention can be further provided with a liquid level alarm and a gas generation abnormality alarm coupled to the electronic control device 40. The electronic control device 40 can receive and transmit the liquid level alarm signal to the liquid level alarm, so that the liquid level alarm issues an alarm and reminds the user; the electronic control device 40 can detect the operating status of the gas generator 31. If the gas generator 31 is abnormal, the electronic control device 40 can transmit a gas generation abnormality alarm signal to the gas generation abnormality alarm, so that the gas generation abnormality alarm issues an alarm and reminds the user.

Thus, the present invention has the following advantages:

1. The present invention can reduce or eliminate the oil mist, harmful gases, dust, and odor generated during the metal heat treatment process, thereby reducing or eliminating the discomfort and disgust of employees in the workplace and surrounding residents with air odor and pollution.

2. The hot exhaust gas treatment device 20 of the present invention is modularly designed, and the user can adjust the number of filters 23 and the positive ion concentration of the treatment liquid according to the amount of hot exhaust gas generated by the connected hot exhaust gas generating device 200, thereby improving the flexibility of the present invention and the hot exhaust gas treatment efficiency and reducing the hot exhaust gas treatment cost.

3. The treatment liquid of the present invention can be continuously circulated and reused in the system through the gas-liquid mixing device 30 to enhance the environmental friendliness of the present invention.

Although the present invention is described with a preferred embodiment, those skilled in the art can make various changes without departing from the spirit and scope of the present invention. The above embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. All modifications or changes that do not violate the spirit of the present invention are within the scope of the patent application of the present invention.

100: hot exhaust gas treatment system 200: hot exhaust gas generating device 300: water delivery device 10: intermediate device 11: stagnation temporary storage space 111: hot exhaust gas stagnation area 112: treatment liquid temporary storage area 12: air delivery hole 13: water delivery hole 14: first cover plate 15: drainage hole 16: liquid level detection element 20: hot exhaust gas treatment device 21: hot exhaust gas treatment space 22: partition plate 221: flow hole 222: drainage part 23: filter element 24: spray element 25: air inlet hole 26: liquid discharge hole 27: exhaust element 28: Heightening part 29: Second cover plate 30: Gas-liquid mixing device 31: Gas generator 32: Transport pipeline 321: Liquid input part 322: Liquid output part 323: Gas input part 33: Pressure pump 40: Electronic control device

[Figure 1] is a schematic diagram of the connection block between the hot exhaust gas treatment system of the embodiment of the present invention and the hot exhaust gas generating device and the water delivery device. [Figure 2] is a schematic diagram of the three-dimensional appearance of the hot exhaust gas treatment system of the embodiment of the present invention. [Figure 3] is a schematic diagram of the three-dimensional appearance of the hot exhaust gas treatment system of the embodiment of the present invention from another perspective. [Figure 4] is a partial cross-sectional view of the hot exhaust gas treatment system of the embodiment of the present invention, which is used to present the component distribution position inside the intermediate device. [Figure 5] is a partial cross-sectional view of the hot exhaust gas treatment system of the embodiment of the present invention, which is used to present the component distribution position inside the hot exhaust gas treatment device. [Figure 6] is a schematic diagram of the flow of hot exhaust gas in the hot exhaust gas treatment device of the embodiment of the present invention, which is used to show that the hot exhaust gas flows in a diagonal direction through the flow holes.

11: Temporary storage space is retained

12: Air supply hole

13: Water delivery hole

21: Hot exhaust gas treatment space

22: Partition

23: Filters

24: Spraying parts

25: Air inlet

26: Leakage hole

27: Exhaust parts

28: Raised parts

31: Gas generator

40:Electronic control device

Claims (10)

A hot waste gas treatment system, comprising: an intermediate device, comprising: a stagnation temporary storage space, comprising: a hot waste gas stagnation zone, which is arranged at the top of the stagnation temporary storage space; and a treatment liquid temporary storage zone, which is arranged at the bottom of the stagnation temporary storage space; an air delivery hole, which is arranged through one side of the intermediate device and coupled to a hot waste gas generating device, the air delivery hole is used to allow the hot waste gas generating device to input a hot waste gas to the hot waste gas stagnation zone; and a water delivery hole, which is arranged through one side of the intermediate device and coupled to a water delivery device, the water delivery hole is used to allow the water delivery device to deliver water to the treatment liquid temporary storage zone; A hot waste gas treatment device is arranged above the intermediate device, and the hot waste gas treatment device includes: A hot waste gas treatment space; A plurality of partitions, which are arranged in the hot waste gas treatment space at intervals, each of which has a flow hole, and the flow holes of two adjacent partitions are arranged diagonally to each other; A plurality of filters, which are arranged staggered with the partitions; A plurality of sprayers, each of which is arranged on the top side of each filter and sprays a treatment liquid; An air inlet, which is penetrated at the bottom of the hot waste gas treatment device and allows the hot waste gas to flow from the hot waste gas retention area into the hot waste gas treatment space; A liquid drain hole is provided at the bottom of the hot waste gas treatment device, and allows the treatment liquid to flow from the hot waste gas treatment space into the treatment liquid temporary storage area; and An exhaust member is provided at the top of the hot waste gas treatment device; and A gas-liquid mixing device, which includes: A gas generator is provided at the top of the hot waste gas treatment device and is used to generate a treatment gas; A delivery pipeline, which includes: A liquid input part is provided at one end of the delivery pipeline, the liquid input part is coupled to the treatment liquid temporary storage area, and inputs the treatment liquid into the delivery pipeline; A liquid output part, which is arranged at the other end of the delivery pipeline, is coupled to the spray parts and outputs the processing liquid to the spray parts; and A gas input part, which is arranged between the liquid input part and the liquid output part and is coupled to the gas generator; and A pressurizing pump, which is arranged between the liquid input part and the gas input part and is used to pressurize the processing liquid. A hot waste gas treatment system as described in claim 1, wherein the intermediate device further includes a first cover plate, and the first cover plate selectively closes the retention temporary storage space. A hot waste gas treatment system as described in claim 1, wherein the intermediate device further comprises a row of sewage holes, and the row of sewage holes is penetrated through the bottom of the intermediate device. A hot waste gas treatment system as described in claim 1, wherein the intermediate device further comprises a liquid level detector, which is arranged in the processing liquid temporary storage area. As described in claim 1, the hot exhaust gas treatment system, wherein the bottom of each partition is recessed with a plurality of drainage portions, and the drainage portions are arranged at intervals. A hot exhaust gas treatment system as described in claim 1, wherein a raising member is provided at the bottom of each filter element. A hot waste gas treatment system as described in claim 1, wherein the hot waste gas treatment device further includes a second cover plate, and the second cover plate selectively closes the hot waste gas treatment space. The hot waste gas treatment system as described in claim 1 further includes an electronic control device, which is coupled to the exhaust component, the gas generator and the pressurizing pump, and is used to control the operation of the exhaust component, the gas generator and the pressurizing pump. A hot waste gas treatment system as described in claim 1, wherein the number of the pressurizing pumps is plural and the pressurizing pumps pressurize the treatment liquid in turn. A thermal exhaust gas treatment system as described in claim 1, wherein the treatment gas is ozone or chlorine dioxide.

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