A flotage plant VOCs gas treatment system

Abstract

The utility model belongs to the industrial and mining tail gas purification equipment technical field, specifically disclose a kind of floatation workshop VOCs gas treatment system, including cyclone tower, mechanical oil mist purifier and activated carbon adsorber, spray liquid and smoke dust reverse contact in cyclone tower, remove large particle in smoke dust, small amount of volatile gas and organic matter, waste gas is exported from the gas outlet of cyclone tower top after preliminary purification, then in turn enter mechanical oil mist purifier and activated carbon adsorber, remove residual particulate matter in waste gas, water vapor, floatation reagent and volatile organic matter and oil class material, finally, the gas after treatment reaches standard is discharged to high altitude through chimney, the spray liquid containing particulate matter and organic matter exported from cyclone tower bottom liquid outlet is handled by oil-water separator and waste residue filtering device, and is pumped to cyclone tower by water pump and is recycled, the utility model floatation workshop VOCs gas treatment system, can effectively treat floatation workshop smoke dust containing waste gas, high efficiency, low energy consumption, process flow is simple.

Description

Technical Field

[0001] This utility model belongs to the technical field of industrial and mining tail gas purification equipment, and specifically discloses a VOCs gas treatment system for flotation workshops. Background Technology

[0002] In the molybdenum and tungsten flotation workshop, a large amount of flotation reagents are used in the flotation process of molybdenum concentrate and tungsten concentrate. Commonly used flotation reagents include butyl xanthate, MOS (fatty acid derivatives), CMC (cellulose derivatives), sulfuric acid, and light diesel oil. Due to the volatilization of flotation reagents and the complex oxidation-reduction reactions that occur in the flotation column during the flotation process, the final emitted exhaust gas contains various pollutants such as volatile organic compounds (VOCs), hydrogen sulfide, mercaptans, sulfides, and dust. This type of exhaust gas containing smoke and dust not only causes a strong odor in the flotation workshop and surrounding environment, seriously affecting the working environment of the plant, but also some of its components can irritate the human respiratory, circulatory, and nervous systems. Long-term exposure to this type of exhaust gas poses a serious threat to human health, and it is very difficult to remove. The production environment needs to be improved. Summary of the Invention

[0003] To address the problems in the background art, this utility model discloses a VOCs gas treatment system for a flotation workshop, including a cyclone tower, a mechanical oil mist purifier, and an activated carbon adsorber, which can effectively treat smoke and dust in the flotation workshop, with high efficiency, low energy consumption, and a simple process flow.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: A VOCs gas treatment system for a flotation workshop includes a gas collection hood with a sealed enclosure outside the flotation column. The gas collection hood's outlet is connected to the inlet of a cyclone tower via a flue. An outlet is located at the top of the cyclone tower, and the outlet is connected in sequence to a mechanical oil mist purifier and an activated carbon adsorber via pipes. The exhaust port of the activated carbon adsorber is connected to the inlet of a chimney via a fan. The treated gas that meets the standards is discharged to the upper atmosphere through the chimney. A liquid outlet is located at the bottom of the cyclone tower, and the liquid outlet is connected to the inlet pipe of an oil-water separator via a pipe. The outlet of the oil-water separator is connected to the inlet of a storage tank. The outlet of the storage tank is connected to a spray head located at the top of the cyclone tower via an inlet pipe and the inlet at the top of the cyclone tower. A water pump is installed at the end of the inlet pipe near the storage tank.

[0005] Furthermore, the VOCs gas treatment system in the flotation workshop includes a waste residue filtration device at the bottom of the storage tank. The waste residue filtration device comprises a multi-layer fine mesh structure. The inlet of the storage tank is located below the waste residue filtration device, and the outlet of the storage tank is located above the waste residue filtration device.

[0006] Furthermore, in the VOCs gas treatment system of the flotation workshop, the lower end of the inlet pipe of the oil-water separator extends to the bottom of the oil-water separator, a first drain outlet is provided at the bottom of the oil-water separator, an oil outlet is provided at the top of the oil-water separator, a water outlet is provided in the middle of the oil-water separator, and stirring blades are provided inside the oil-water separator. The drive shaft of the stirring blades is connected to a motor located above the oil-water separator.

[0007] Furthermore, in the VOCs gas treatment system of the flotation workshop, the liquid stored in the storage tank is water or an alkaline solution, wherein the alkaline solution is an aqueous solution of sodium hydroxide, an aqueous solution of potassium hydroxide, an aqueous solution of sodium carbonate, an aqueous solution of potassium carbonate, or ammonia.

[0008] Furthermore, in the VOCs gas treatment system of the flotation workshop, the activated carbon adsorber is filled with activated carbon particles and / or activated carbon fibers.

[0009] Furthermore, the VOCs gas treatment system in the flotation workshop is equipped with an observation tube outside the oil-water separator that communicates with the inside of the oil-water separator. The height of the connection point between the observation tube and the inside of the oil-water separator is lower than the height of the outlet of the oil-water separator. The separation of the oil layer and the water layer inside the oil-water separator can be observed through the observation tube.

[0010] Compared with the prior art, the beneficial effects of this utility model are: This utility model discloses a VOCs gas treatment system for a flotation workshop, including a cyclone tower, a mechanical oil mist purifier, and an activated carbon adsorber. In the cyclone tower, the spray liquid comes into counter-current contact with the flue gas, removing large particles, small amounts of volatile gases, and organic matter. After preliminary purification, the exhaust gas is discharged from the outlet at the top of the cyclone tower and then sequentially enters the mechanical oil mist purifier and activated carbon adsorber to remove residual particles, water vapor, oily substances such as flotation reagents, and volatile organic compounds. Finally, the treated gas that meets the standards is discharged into the high atmosphere through a chimney. The spray liquid containing particles and organic matter discharged from the outlet at the bottom of the cyclone tower is treated by an oil-water separator and a waste residue filter before being pumped back to the cyclone tower for recycling. This utility model's VOCs gas treatment system for a flotation workshop can effectively treat flue gas containing smoke and dust, with high efficiency, low energy consumption, and a simple process flow. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the gas flow direction of the VOCs gas treatment system of this utility model; Figure 2 This is a schematic diagram of the VOCs gas treatment system of this utility model; Figure 3 This is a three-dimensional structural diagram of the waste residue filtration device in this utility model; In the above diagram: 1-Gas collection hood; 2-Swirl tower; 3-Spray head; 4-Mechanical oil mist purifier; 5-Activated carbon adsorber; 6-Fan; 7-Chimney; 8-Oil-water separator; 9-Stirring blades; 10-Observation tube; 11-Liquid storage tank; 12-Waste residue filtration device; 13-Water pump. Detailed Implementation

[0012] To better understand this utility model, the following embodiments further illustrate the content of this utility model, but the content of this utility model is not limited to the following embodiments.

[0013] Combined with appendix Figure 1-3 This invention provides a detailed description of a VOCs gas treatment system for a flotation workshop, comprising a gas collection hood 1 enclosed outside the flotation column, the gas collection hood 1 having its outlet connected to the air inlet at the bottom of a cyclone tower 2 via a flue, an outlet at the top of the cyclone tower 2, the outlet being connected in sequence to a mechanical oil mist purifier 4 and an activated carbon adsorber 5 via pipes, the exhaust port of the activated carbon adsorber 5 being connected to the air inlet of a chimney 7 via a fan 6, the treated gas being discharged to the high altitude via the chimney 7, a liquid outlet at the bottom of the cyclone tower 2 being connected to the liquid inlet pipe of an oil-water separator 8 via a pipe, the water outlet of the oil-water separator 8 being connected to the water inlet of a storage tank 11, the water outlet of the storage tank 11 being connected to a spray head 3 located at the top of the cyclone tower 2 via a water inlet pipe and the liquid inlet at the top of the cyclone tower 2, and a water pump 13 being installed at one end of the water inlet pipe near the storage tank 11; It should be noted that the mechanical oil mist purifier 4 is an existing device. This utility model adopts an M8000-V three-stage filtration mechanical oil mist purifier. Gas is drawn in through the air inlet at the bottom of the purifier and passes sequentially through a stainless steel wire filter, a pre-filter, and an S-type self-cleaning filter. Oil mist particles in the gas move on the steel wires and fibers and agglomerate into larger droplets. The larger droplets are dragged along the oil discharge channel by the airflow to the filter media outlet and flow out of the filter layer under gravity, thus achieving oil mist filtration and purification. When the pre-filter and S-type filter reach saturation, the dripping return liquid is discharged through the filter and can be used for recirculation. This purifier is equipped with a differential pressure display, which prompts the filter to be replaced when the pressure of the filter drops to a specified value. During operation, the spray liquid sprayed from the top spray head 3 of the cyclone tower 2 comes into counter-current contact with the flue gas containing smoke and dust entering from the lower air inlet of the cyclone tower 2, removing large particulate matter, a small amount of volatile gases and organic matter from the flue gas. After preliminary purification, the flue gas is discharged from the air outlet at the top of the cyclone tower 2, and then enters the mechanical oil mist purifier 4 and the activated carbon adsorber 5 in sequence to remove residual particulate matter, water vapor, oily substances such as flotation agents and volatile organic compounds from the flue gas.

[0014] As an optional design, the VOCs gas treatment system in the flotation workshop is preferably equipped with a waste residue filter device 12 at the bottom of the storage tank 11. The waste residue filter device 12 includes a multi-layer fine mesh structure. The waste residue filter device 12 can filter out residual particulate matter in the spray liquid that has been initially separated by the oil-water separator 8, which is beneficial to improving the spraying effect of the cyclone tower and the operating efficiency of the entire system. The water inlet of the storage tank 11 is located below the waste residue filter device 12, and the water outlet of the storage tank 11 is located above the waste residue filter device 12. The supernatant after being filtered by the waste residue filter device 12 is pumped to the cyclone tower 2 by the water pump 13 for recycling. A second drain outlet is also provided at the bottom of the storage tank 11. When the spray liquid in the storage tank 11 needs to be replaced, it is discharged from the second drain outlet.

[0015] As an optional design, the VOCs gas treatment system in the flotation workshop is preferred. The lower end of the inlet pipe of the oil-water separator 8 extends to the bottom of the oil-water separator 8. A first drain outlet is provided at the bottom of the oil-water separator 8, an oil outlet is provided at the top of the oil-water separator 8, and a water outlet is provided in the middle of the oil-water separator 8. A stirring blade 9 is provided inside the oil-water separator 8, and the drive shaft of the stirring blade 9 is connected to a stirring motor located above the oil-water separator 8. Under gravity, the oil-water mixture in the oil-water separator 8 floats due to the density difference between oil and water; the lighter oil phase floats. On the water surface, the heavier water phase settles at the bottom. Since the lower end of the inlet pipe of the oil-water separator 8 extends to the bottom of the oil-water separator 8, the oil and water enter the oil-water separator 8 and play a role in stirring and turbulence. At the same time, under the intermittent stirring of the stirring motor, the liquid in the oil-water separator 8 is fully stirred to avoid emulsification and to ensure that the oil and water are fully separated. Meanwhile, the particulate matter settles under the action of gravity. After working for a period of time, the upper oil layer accumulates and is discharged from the upper oil outlet, the middle water layer is discharged from the middle water outlet into the storage tank 11, and the lower layer containing sediment is discharged from the lower first sewage outlet.

[0016] As an optional design, the VOCs gas treatment system in the flotation workshop is preferred, wherein the liquid stored in the storage tank 11 is water or an alkaline solution, and the alkaline solution is an aqueous solution of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, or ammonia. When the concentration of VOCs gas in the flue dust is low, water is selected as the spray liquid, and when the concentration of VOCs gas in the flue dust is high, an alkaline spray liquid is selected.

[0017] As an optional design, the VOCs gas treatment system in the flotation workshop is preferred, wherein the activated carbon adsorber 5 is filled with activated carbon particles and / or activated carbon fibers to fully adsorb various organic components in the waste gas.

[0018] As an optional design, the VOCs gas treatment system in the flotation workshop is preferably provided with an observation tube 10 connected to the inside of the oil-water separator 8. The height of the connection point between the observation tube 10 and the inside of the oil-water separator 8 is lower than the height of the outlet of the oil-water separator 8. Utilizing the principle of connection, the separation of the oil layer and the water layer inside the oil-water separator 8 can be observed through the observation tube 10. The oil-water separation status inside the oil-water separator 8 can be easily observed without opening the top cover of the oil-water separator 8.

[0019] The working process of this utility model is as follows: Based on the concentration of VOCs in the flue gas, a neutral or alkaline scrubbing liquid is selected. During operation, the scrubbing liquid in the cyclone tower 2 comes into countercurrent contact with the flue gas, removing large particles, small amounts of volatile gases, and organic matter from the flue gas. After preliminary purification, the exhaust gas is discharged from the outlet at the top of the cyclone tower 2, and then sequentially enters the mechanical oil mist purifier 4 and the activated carbon adsorber 5 to remove residual particles, water vapor, oily substances such as flotation reagents, and volatile organic compounds from the exhaust gas. Finally, the treated gas that meets the standards is discharged to the high altitude through the chimney 7. The scrubbing liquid containing particles and organic matter discharged from the bottom outlet of the cyclone tower 2 is treated by the oil-water separator 8 and the waste residue filter 12, and then pumped back to the cyclone tower 2 by the water pump 13 for recycling. Using this utility model of VOCs gas treatment system for flotation workshops, harmful flue gas in flotation workshops can be effectively treated with high efficiency, low energy consumption, and a simple process flow.

[0020] The above description is only an application implementation of this utility model, but the protection scope of this utility model is not limited thereto and cannot be used to limit the scope of rights of this utility model. Any equivalent changes made according to the technical solution of this utility model should be included within the protection scope of this utility model.

Claims

1. A floating plant VOCs gas abatement system characterized by: The system includes a gas collection hood with a sealed enclosure outside the flotation column. The gas outlet of the gas collection hood is connected to the air inlet of the cyclone tower via a flue. An air outlet is located at the top of the cyclone tower. The air outlet is connected to a mechanical oil mist purifier and an activated carbon adsorber via pipes. The exhaust port of the activated carbon adsorber is connected to the air inlet of the chimney via a fan. The treated gas is discharged to the upper atmosphere through the chimney. A liquid outlet is located at the bottom of the cyclone tower. The liquid outlet is connected to the liquid inlet pipe of an oil-water separator via a pipe. The water outlet of the oil-water separator is connected to the water inlet of a storage tank. The water outlet of the storage tank is connected to a spray head located at the top of the cyclone tower via a water inlet pipe and the liquid inlet at the top of the cyclone tower. A water pump is installed at the end of the water inlet pipe near the storage tank.

2. The VOCs gas treatment system for flotation workshop according to claim 1, characterized in that: A waste residue filtration device is installed at the bottom of the liquid storage tank. The waste residue filtration device includes a multi-layer fine mesh structure. The water inlet of the liquid storage tank is located below the waste residue filtration device, and the water outlet of the liquid storage tank is located above the waste residue filtration device.

3. The VOCs gas treatment system for the flotation workshop according to claim 2, characterized in that: The lower end of the inlet pipe of the oil-water separator extends to the bottom of the oil-water separator. A first drain outlet is provided at the bottom of the oil-water separator, an oil outlet is provided at the top of the oil-water separator, and a water outlet is provided in the middle of the oil-water separator. A stirring blade is provided inside the oil-water separator, and the drive shaft of the stirring blade is connected to a motor located above the oil-water separator.

4. The VOCs gas treatment system for flotation workshop according to claim 3, characterized in that: liquid storage... The liquid stored in the box is water or an alkaline solution, wherein the alkaline solution is an aqueous solution of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, or ammonia.

5. The VOCs gas treatment system for the flotation workshop according to claim 3, characterized in that: The activated carbon adsorber is filled with activated carbon particles and / or activated carbon fibers.

6. The VOCs gas treatment system for the flotation workshop according to claim 3, characterized in that: in An observation tube connected to the inside of the oil-water separator is also installed on the outside of the oil-water separator. The height of the connection point between the observation tube and the inside of the oil-water separator is lower than the height of the water outlet of the oil-water separator. The separation of the oil layer and the water layer inside the oil-water separator can be observed through the observation tube.

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