Extruder waste gas treatment system

Abstract

The utility model discloses an extruder waste gas treatment system which comprises a spray cooling tank, a front fan, an absorption tank, a rear fan, an adsorption box and a smoke exhaust pipe which are sequentially connected, and the spray cooling tank is further connected with a liquid collecting tank. A three-stage smoke removal mode is adopted, in the first stage, most of smoke is cooled through the spray cooling tank and combined with vaporific water, and the smoke is enriched in the liquid collection tank after being cooled; in the second stage, harmful substances in the gas are further removed through liquid which is stored in the absorption tank and can react with harmful flue gas or can absorb the harmful flue gas; in the third stage, harmful substances in the airflow are further adsorbed through adsorption substances in the adsorption box. The waste gas treatment system for the extruder has better treatment capacity on waste gas of the extruder, has the characteristics of simple structure and high treatment efficiency, and can effectively reduce the replacement frequency of adsorption substances in the adsorption box.

Description

Technical Field

[0001] The utility model relates to an exhaust gas treatment system, in particular to an exhaust gas treatment system for an extruder. Background Art

[0002] The exhaust gas of a plastic extruder is the organic exhaust gas generated when the extruder melts and granulates plastics. Generally, it consists of complex components such as oil mist, soot, and VOCs. The traditional treatment method is generally adsorption. However, because the adsorption capacity of the activated carbon adsorbed with a large amount of oil and gas gradually weakens, if the activated carbon is not replaced in time, there will still be a large amount of volatile organic compound gases in the tail gas discharged into the atmosphere, resulting in excessive emissions and unpleasant odors in the production site. But frequent replacement of the activated carbon will affect and reduce the production OEE, and the price of the activated carbon is relatively high. If it is replaced frequently, it will cause a large increase in production costs.

[0003] Therefore, it is necessary to provide a new exhaust gas treatment system with strong treatment ability for organic flue gas to solve the above technical problems. Summary of the Utility Model

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide an exhaust gas treatment system for an extruder. The exhaust gas treatment system for an extruder adopts a three-stage smoke removal method. In the first stage, most of the flue gas is cooled by a spray cooling tank and combined with atomized water, and is enriched in a liquid collection tank after cooling; in the second stage, the harmful substances in the gas are further removed by the liquid stored in an absorption tank that can react with or absorb the harmful flue gas; in the third stage, the harmful substances in the air flow are further adsorbed by the adsorption substances in an adsorption box. The exhaust gas treatment system for an extruder in the utility model has good treatment ability for the exhaust gas of the extruder, has the characteristics of simple structure and high treatment efficiency, and can effectively reduce the replacement frequency of the adsorption substances in the adsorption box.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] An exhaust gas treatment system for an extruder includes a spray cooling tank, a liquid collection tank, a pre-positioned fan, an absorption tank, a post-positioned fan, an adsorption box, and an exhaust pipe; the spray cooling tank, the pre-positioned fan, the absorption tank, the post-positioned fan, the adsorption box, and the exhaust pipe are connected in sequence, and the spray cooling tank is connected to the liquid collection tank.

[0007] In the utility model, the spray cooling tank includes an air inlet, a spray port, a perforated plate, a partition plate, and an air outlet; the air inlet and the air outlet are located at the top of the spray cooling tank and are separated by a partition plate in the vertical direction, forming a U-shaped gas channel from top to bottom and then back up; the spray port is located on the side wall of the spray cooling tank, and the spray cooling tank is provided with at least one perforated plate in the horizontal direction.

[0008] In the present utility model, the main body of the spray cooling tank is in the shape of a cube or a cuboid, and the bottom is a conical structure.

[0009] In the present utility model, the tank body of the spray cooling tank is evenly separated by a partition plate in the vertical direction.

[0010] In the present utility model, 4 to 10 porous plates are provided in the horizontal direction inside the tank body of the spray cooling tank;

[0011] Preferably, the porous plates are evenly spaced in the vertical direction perpendicular to the central axis of the tank body of the spray cooling tank;

[0012] More preferably, the aperture of the holes in the porous plates is 1 to 15 mm.

[0013] In the present utility model, the number of spray nozzles inside the tank body of the spray cooling tank is 4 to 10;

[0014] Preferably, the spray nozzles are evenly distributed on the side wall of the spray cooling tank.

[0015] In the present utility model, the bottom of the conical structure of the spray cooling tank is connected to the liquid collection tank;

[0016] Preferably, the liquid collection tank is provided with a ventilation hole at the top and a liquid outlet at the bottom.

[0017] In the present utility model, the absorption tank includes a ventilation hole, an intake diffuser pipe, a liquid discharge port and an air outlet hole; the ventilation hole is located at one end of the top of the absorption tank; the intake diffuser pipe is located at the bottom of the absorption tank at the end with the ventilation hole, and the intake diffuser pipe is connected to the outlet of the pre - placed fan; the air outlet hole is located at the other end of the top of the absorption tank and is connected to the inlet of the post - placed fan; the liquid discharge port is located at the bottom of the absorption tank at the end with the air outlet hole;

[0018] Preferably, the intake diffuser pipe is an intake pipe extending into the absorption tank and having small holes on the pipe wall;

[0019] More preferably, the length of the intake diffuser pipe is 0.8 to 1.5 m, the diameter is 100 to 500 mm, and the aperture of the small holes is 10 to 50 mm.

[0020] In the present utility model, an absorbent is filled in the absorption tank, and the absorbent is selected from liquid reagents that can react with or absorb harmful flue gas.

[0021] In the present utility model, an adsorbent is filled in the adsorption box;

[0022] Preferably, the adsorbent is selected from substances that can adsorb organic gases, preferably any one of activated carbon and filter cotton.

[0023] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0024] The exhaust gas treatment system of the extruder of the utility model adopts a three-stage smoke removal method. In the first stage, most of the flue gas is cooled by a spray cooling tank and combined with atomized water, and is enriched in the liquid collection tank after cooling; in the second stage, the harmful substances in the gas are further removed by the liquid stored in the absorption tank that can react with or absorb the harmful flue gas; in the third stage, the harmful substances in the air flow are further adsorbed by the adsorption substances in the adsorption box.

[0025] When the exhaust gas treatment system of the extruder of the utility model is used to treat the exhaust gas of the extruder, there is less organic gas remaining in the adsorption box after the first-stage and second-stage treatments, which can effectively reduce the replacement frequency of the adsorption substances in the adsorption box. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the exhaust gas treatment system of the extruder of the utility model.

[0027] In the figure, spray cooling tank 1, air inlet 1-1, spray port 1-2, perforated plate 1-3, partition plate 1-4, air outlet 1-5, liquid collection tank 2, ventilation hole 2-1, liquid outlet 2-2, pre-positioned fan 3, absorption tank 4, ventilation hole 4-1, air inlet diffuser pipe 4-2, liquid discharge port 4-3, post-positioned fan 5, adsorption box 6, smoke exhaust pipe 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following further describes the utility model through specific implementation manners. The implementation manners described in the utility model are only for the purpose of explaining the utility model and do not limit the scope of the utility model.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0030] An exhaust gas treatment system for an extruder, the schematic structural diagram is as Figure 1 shown, including a spray cooling tank 1, a liquid collection tank 2, a pre-positioned fan 3, an absorption tank 4, a post-positioned fan 5, an adsorption box 6, and a smoke exhaust pipe 7; the spray cooling tank 1, the pre-positioned fan 3, the absorption tank 4, the post-positioned fan 5, the adsorption box 6, and the smoke exhaust pipe 7 are sequentially connected through pipelines; the bottom of the spray cooling tank 1 is connected to the liquid collection tank 2.

[0031] Among them, the spray cooling tank 1 includes an air inlet 1-1, a spray port 1-2 (for example, 6 pieces), a porous plate 1-3 (for example, 6 pieces, with a pore size of 5 mm), a partition 1-4, and an air outlet 1-5; the liquid collecting tank 2 includes an air vent 2-1 and a liquid outlet 2-2; the absorption tank 4 includes an air vent 4-1, an air inlet diffuser 4-2, and a liquid discharge port 4-3, and there is also an air outlet (not marked) connected to the inlet of the rear fan 5.

[0032] Among them, the main body of the spray cooling tank 1 is a cube or a rectangular parallelepiped, and the bottom is a conical structure. The bottom of the conical structure is connected to the liquid collecting tank, so that most of the flue gas in the spray cooling tank 1 is cooled and combined with mist water, and enriched in the liquid collecting tank 2 after cooling.

[0033] The air inlet 1-1 of the spray cooling tank 1 is located on one side of the top of the spray cooling tank, and the air outlet 1-5 is located on the other side of the top of the spray cooling tank; the middle of the spray cooling tank body is evenly separated by a partition 1-4 to separate the air inlet 1-1 and the air outlet 1-5, so that the smoke entering the spray cooling tank 1 first goes down from one side of the air inlet 1-1, passes through the bottom of the tank and then goes up along one side of the air outlet 1-5, forming a U-shaped smoke channel.

[0034] The spray cooling tank body is provided with at least one porous plate to evenly separate the tank body along the vertical direction, preferably 4 to 10 pieces, for example 4, 5, 6, 7, 8, 9, 10 pieces, the porous plate is similar to the sieve plate of the distillation tower, providing a place for gas-liquid contact and improving mass transfer; the porous plate preferably has evenly distributed small holes, the pore size of the small holes is 1 to 15 mm, for example 1 mm, 2 mm, 3 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, etc.

[0035] The side wall of the spray cooling tank body is preferably provided with a plurality of spray openings, and the number of the spray openings is preferably 4 to 10, for example 4, 5, 6, 7, 8, 9, 10. The plurality of spray openings are evenly spaced and the spray openings spray mist water to make it contact with the flue gas and cool the flue gas.

[0036] Among them, the liquid contained in the absorption tank can react with the harmful flue gas or absorb the harmful flue gas. The absorbent contained in the absorption tank is, for example, an aqueous sodium hydroxide solution with a mass concentration of 5%. To make the absorption more sufficient, it is preferable to introduce the flue gas into the absorption tank by means of an intake diffuser pipe. The intake diffuser pipe is an intake pipe that extends into the absorption tank with a certain length and has small holes on the surface of the pipe wall. Among them, the length of the intake diffuser pipe (i.e., the length extending into the absorption tank) is 0.8 - 1.5 m, such as 0.9 m, 1 m, 1.1 m, 1.2 m, 1.3 m, 1.4 m, etc., the diameter of the intake diffuser pipe is 100 - 500 mm, such as 100 mm, 200 mm, 300 mm, 400 mm, 500 mm, etc., and the aperture of the small holes on the intake diffuser pipe is 10 - 50 mm, such as 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, etc.

[0037] Among them, the adsorption box is filled with an adsorbent that can adsorb organic gases. The adsorbent is, for example, activated carbon, filter cotton, etc., to further adsorb and process the harmful substances in the air flow.

[0038] The working process of the exhaust gas treatment system of the extruder in this embodiment is as follows:

[0039] The flue gas of the extruder enters the spray cooling tank 1 through the air inlet 1 - 1. The flue gas is cooled by the misty water sprayed from the spray nozzle 1 - 2 and combines with the misty water to form a liquid. Moreover, the flue gas is cooled layer by layer through the porous plate 1 - 3. The liquid formed by the combination of the flue gas and the misty water enters the liquid collection tank 2. The uncooled flue gas, driven by the wind, passes through the intake diffuser pipe 4 - 2 under the action of the front - stage fan 3 and enters the absorption tank 4. The flue gas is adsorbed by the liquid in the absorption tank or reacts with the liquid in the tank. The remaining small amount of flue gas, driven by the wind, enters the adsorption box 6 under the action of the rear - stage fan 5. After being adsorbed by the adsorption substance in the adsorption box, the clean gas enters the atmosphere through the exhaust pipe 7.

[0040] The above - mentioned is only the preferred embodiment of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the method of the present utility model, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present utility model.

Claims

1. An extruder waste gas treatment system, characterized in that, It includes a spray cooling tank, a liquid collection tank, a pre - blower, an absorption tank, a post - blower, an adsorption box, and a smoke exhaust pipe; the spray cooling tank, the pre - blower, the absorption tank, the post - blower, the adsorption box, and the smoke exhaust pipe are connected in sequence, and the spray cooling tank is connected to the liquid collection tank; The spray cooling tank includes an air inlet, a spray port, a perforated plate, a partition plate, and an air outlet; the air inlet and the air outlet are located at the top of the spray cooling tank and are separated by a vertically - arranged partition plate, forming a U - shaped gas passage that goes from top to bottom and then back up; the spray port is located on the side wall of the spray cooling tank, and the spray cooling tank is provided with at least one perforated plate in the horizontal direction; The absorption tank includes a ventilation hole, an air inlet diffuser pipe, a liquid discharge port, and an air outlet hole; the ventilation hole is located at one end of the top of the absorption tank; the air inlet diffuser pipe is located at the bottom of the absorption tank at the end with the ventilation hole, and the air inlet diffuser pipe is connected to the outlet of the pre - blower; the air outlet hole is located at the other end of the top of the absorption tank and is connected to the inlet of the post - blower; the liquid discharge port is located at the bottom of the absorption tank at the end with the air outlet hole; The absorption tank is filled with an absorbent, and the absorbent is selected from liquid reagents that can react with harmful flue gas or absorb harmful flue gas; The adsorption box is filled with an adsorbent, and the adsorbent is selected from substances that can adsorb organic gases.

2. The extruder waste gas treatment system according to claim 1, wherein The main body of the spray cooling tank is in the shape of a cube or a cuboid, and the bottom is a conical structure.

3. The extruder waste gas treatment system according to claim 1, characterized in that The tank body of the spray cooling tank is evenly separated by a vertically - arranged partition plate.

4. The extruder waste gas treatment system according to claim 1, wherein, There are 4 - 10 perforated plates arranged in the horizontal direction inside the tank body of the spray cooling tank.

5. The extruder waste gas treatment system according to claim 4, wherein, The perforated plates are evenly spaced along the vertical direction of the central axis of the tank body of the spray cooling tank.

6. The extruder waste gas treatment system according to claim 5, wherein, The aperture of the holes in the perforated plate is 1 - 15 mm.

7. The extruder waste gas treatment system according to claim 1, wherein, The number of spray ports inside the tank body of the spray cooling tank is 4 - 10.

8. The extruder waste gas treatment system according to claim 7, characterized in that, The spray ports are evenly distributed on the side wall of the spray cooling tank.

9. The extruder waste gas treatment system according to claim 2, wherein, The conical bottom of the spray cooling tank is connected to the liquid collection tank.

10. The extruder waste gas treatment system according to claim 9, characterized in that, The liquid collection tank is provided with a ventilation hole at the top and a liquid outlet at the bottom.

11. The extruder waste gas treatment system according to claim 1, wherein, The air inlet diffuser pipe is an inlet pipe with small holes extending into the absorption tank.

12. The extruder waste gas treatment system according to claim 11, wherein, The length of the air inlet diffuser pipe is 0.8 - 1.5 m, the diameter is 100 - 500 mm, and the aperture of the small holes is 10 - 50 mm.

13. The extruder waste gas treatment system according to claim 1, characterized in that, The adsorbent is any one of activated carbon and filter cotton.

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