VOC waste gas treatment device

Abstract

The utility model discloses a VOC waste gas treatment device, and relates to the technical field of industrial waste gas treatment, the VOC waste gas treatment device comprises a water ring vacuum pump, a gas inlet buffer tank and a gas outlet buffer box, a near-end gas inlet pipe is connected between the gas inlet end of the water ring vacuum pump and the gas inlet buffer tank, the gas inlet buffer tank is provided with a far-end gas inlet pipe, and the gas outlet buffer tank is provided with a gas outlet pipe. The far-end air inlet pipe is used for being connected with an exhaust port of an extruder; a near-end gas outlet pipe is connected between the gas outlet end of the water ring vacuum pump and the gas outlet buffer tank, the gas outlet buffer tank is provided with a far-end gas outlet pipe, and the far-end gas outlet pipe is used for discharging waste gas to a waste gas treatment center; the air inlet buffer tank is provided with a liquid discharge pipe, and the liquid discharge pipe is provided with a switch valve. The gas inlet buffer tank is used for buffering, so that the operation of the waste gas treatment device is more stable, and the influence of the fluctuation of the operation state of the water ring vacuum pump on the VOC waste gas treatment effect is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of industrial waste gas treatment technology, in particular to a VOC waste gas treatment device. BACKGROUND

[0002] VOC small molecule gas is prone to occur in the melt mixing process of thermoplastic elastic members in an extruder, and direct discharge can easily pollute the environment and cause serious threat to the environment and human health. At present, common VOC treatment technologies mainly include adsorption method, combustion method, biological degradation method, photocatalytic oxidation method, etc.

[0003] The waste gas generated by the extruder is usually sucked by a vacuum device. During the operation of the vacuum device, negative pressure fluctuation may occur due to aging, wear or local failure of parts, etc., so that the stability of the vacuum device during operation is affected, thereby affecting the treatment effect of VOC waste gas. CONTENT OF THE UTILITY MODEL

[0004] In order to reduce the influence of the operation of the vacuum device, the present application provides a VOC waste gas treatment device.

[0005] The VOC waste gas treatment device provided by the present application adopts the following technical scheme:

[0006] A VOC waste gas treatment device, comprising a water ring vacuum pump, an inlet buffer tank and an outlet buffer tank, a proximal inlet pipe is connected between the inlet end of the water ring vacuum pump and the inlet buffer tank, the inlet buffer tank is provided with a distal inlet pipe, and the distal inlet pipe is used to connect the exhaust port of the extruder; a proximal outlet pipe is connected between the outlet end of the water ring vacuum pump and the outlet buffer tank, the outlet buffer tank is provided with a distal outlet pipe, and the distal outlet pipe is used to discharge waste gas to a waste gas treatment center; the inlet buffer tank is provided with a liquid discharge pipe, and the liquid discharge pipe is provided with an on-off valve.

[0007] By adopting the above technical scheme, the water ring vacuum pump can uniformly inhale air and stably and reliably operate. When the water ring vacuum pump works, it sucks the waste gas generated by the extruder through negative pressure. The waste gas generated by the extruder first enters the inlet buffer tank through the distal inlet pipe, then enters the water ring vacuum pump through the proximal inlet pipe, and then enters the outlet buffer tank through the proximal outlet pipe, and then is discharged through the distal outlet pipe. Part of the components with relatively high boiling point in the waste gas are condensed in the inlet buffer tank, and the liquid components condensed and stored in the inlet buffer tank can be discharged through the liquid discharge pipe, so that the pre-treatment of part of the components in the VOC waste gas is realized. Moreover, reducing the components in the VOC that are easy to condense can reduce the adverse effects of liquid organic waste on the adsorbent used in the adsorption method. During the operation of the water ring vacuum pump, the inlet buffer tank is used for buffering, which is conducive to making the operation of the waste gas treatment device more stable and reducing the influence of the fluctuation of the operation state of the water ring vacuum pump on the treatment effect of the VOC waste gas.

[0008] Optionally, the distal end gas inlet pipe is provided with a first driven on-off valve, and the distal end gas outlet pipe is provided with a second driven on-off valve.

[0009] By adopting the above technical scheme, during the operation of the water ring vacuum pump, the first driven on-off valve is closed first, and then the second driven on-off valve is closed, so that the gas inlet buffer tank and the gas outlet buffer tank can retain a certain vacuum degree, and thus the water ring vacuum pump can be intermittently operated, and during the interval of two operations of the water ring vacuum pump, the residual negative pressure of the gas inlet buffer tank is used to absorb the exhaust gas of the extrusion.

[0010] Optionally, the gas outlet buffer tank comprises a tank body and a tank cover, and a quick buckle is connected between the tank cover and the tank body.

[0011] By adopting the above technical scheme, the tank cover and the tank body are connected through the quick buckle, so that the gas outlet buffer tank is relatively convenient to disassemble and assemble, thereby facilitating the cleaning of the gas outlet buffer tank.

[0012] Optionally, the proximal end gas inlet pipe is connected to the upper portion of the gas inlet buffer tank, the distal end gas inlet pipe is connected to the lower portion of the gas inlet buffer tank, a spiral plate is arranged on the inner side of the gas inlet buffer tank, the center line of the spiral plate is arranged in the vertical direction, a core column is arranged at the center of the spiral plate, and the spiral plate and the core column divide the inner space of the gas inlet buffer tank to form a spiral flow channel.

[0013] By adopting the above technical scheme, the spiral plate and the core column jointly divide the inner space of the gas inlet buffer tank into a spiral flow channel, which is beneficial to increasing the residence time of the exhaust gas in the gas inlet buffer tank and beneficial to condensing more gas components in the gas inlet buffer tank.

[0014] Optionally, the core column is in a hollow pipe structure, an end plate is arranged at the upper end of the core column, and a height allowance is left between the lower end of the core column and the bottom wall of the gas inlet buffer tank; a plurality of through holes are arranged on the peripheral wall of the core column in the height direction, and the port edge of the through hole away from the center of the core column intersects with the upper surface of the spiral plate.

[0015] By adopting the above technical scheme, when part of the components in the exhaust gas are condensed into liquid droplets on the upper surface of the spiral plate, the condensed liquid droplets can enter the inner side of the core column through the through hole, and then flow downward and converge to the bottom of the gas inlet buffer tank.

[0016] Optionally, the outer spiral edge of the spiral plate is higher than the inner spiral edge.

[0017] By adopting the above technical scheme, the outer spiral edge of the spiral plate is higher than the inner spiral edge, so that the liquid droplets on the upper surface of the spiral plate are more prone to flow to the core column, thereby making the liquid droplets more prone to enter the inner side of the core column through the through hole.

[0018] Optionally, the through hole is a tapered hole, a large end of the tapered hole is away from the center line of the core column, and a small end of the tapered hole is inclined downward.

[0019] By adopting the technical scheme, the through hole is arranged as a tapered hole structure, gas inside the core column is not easy to flow outward through the through hole, and it is beneficial to make the gas in the air intake buffer tank flow along a spiral path as much as possible.

[0020] Optionally, the air intake buffer tank comprises a tank body and a top cover, the top cover is detachably connected with the tank body, an upper end of the core column is connected with the top cover, and an outer spiral edge of the spiral plate abuts against an inner wall of the tank body.

[0021] By adopting the technical scheme, the core column is connected with the top cover, and the spiral plate is connected with the core column, so that the spiral plate can be installed and fixed without being connected with the inner wall of the tank body, thereby making the spiral plate be able to be removed from the tank body and making the cleaning of the inner wall of the tank body and the surface of the spiral plate more convenient.

[0022] Optionally, the top cover is provided with a insertion hole for the core column to pass through, the upper end of the core column passes out of the insertion hole, the upper end of the core column is provided with a limiting ring, the limiting ring is located on the inner side of the top cover, and a sealing gasket is arranged between the limiting ring and the top cover; the upper end of the core column is provided with an external thread, a nut is connected with the core column through the external thread, and the nut abuts against the top cover.

[0023] By adopting the technical scheme, the upper end of the core column passes out of the top cover, when the nut is locked, the nut and the limiting ring jointly clamp the top cover, so that detachable connection is formed between the core column and the top cover. The sealing gasket located between the limiting ring and the top cover can seal the through hole, which is beneficial to guarantee the sealing performance of the air intake buffer tank.

[0024] In summary, the present application has at least one of the following beneficial technical effects:

[0025] 1. The exhaust gas generated by the extruder first enters the air intake buffer tank through the distal end air inlet pipe, then enters the water ring vacuum pump through the proximal end air inlet pipe, and then enters the air outlet buffer tank through the proximal end air outlet pipe, and finally is discharged through the distal end air outlet pipe. Some high-boiling-point components in the exhaust gas are condensed in the air intake buffer tank, and the liquid components condensed and stored in the air intake buffer tank can be discharged through the liquid discharge pipe. The use of the air intake buffer tank for buffering is beneficial to make the operation of the exhaust gas treatment device more stable.

[0026] 2. The tank cover and the tank body are connected through a quick buckle, so that the air outlet buffer tank is more convenient to disassemble and assemble, thereby facilitating the cleaning of the air outlet buffer tank. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of embodiment 1.

[0028] Figure 2 is a structural schematic diagram of the intake buffer tank of Example 2.

[0029] Figure 3 is Figure 2 is an enlarged view at A in

[0030] Figure 4 is Figure 2 is an enlarged view at B in

[0031] Figure 5 is a whole structural schematic diagram of Example 3.

[0032] BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 1, water ring vacuum pump; 2, intake buffer tank; 21, tank body; 22, top cover; 221, jack; 23, spiral plate; 24, core column; 241, end plate; 242, limiting ring; 243, through hole; 25, sealing washer; 26, nut; 3, exhaust buffer box; 31, box body; 32, box cover; 33, sealing gasket; 34, quick buckle; 41, proximal end intake pipe; 42, distal end intake pipe; 43, first driven on-off valve; 51, proximal end exhaust pipe; 52, distal end exhaust pipe; 53, second driven on-off valve; 6, liquid discharge pipe; 61, on-off valve; 7, semiconductor refrigeration sheet. DETAILED DESCRIPTION

[0034] The following will be described in detail in combination with the accompanying Figures 1-5 The application is further described in detail.

[0035] Example 1

[0036] The application discloses a VOC waste gas treatment device. Referring to Figure 1 , the VOC waste gas treatment device comprises a water ring vacuum pump 1, an intake buffer tank 2 and an exhaust buffer box 3, a proximal end intake pipe 41 is connected between an intake end of the water ring vacuum pump 1 and the intake buffer tank 2, the intake buffer tank 2 is provided with a distal end intake pipe 42, and the distal end intake pipe 42 is used for connecting an exhaust port of an extruder; a proximal end exhaust pipe 51 is connected between an exhaust end of the water ring vacuum pump 1 and the exhaust buffer box 3, the proximal end exhaust pipe 51 is connected to an upper portion of the exhaust buffer box 3, the exhaust buffer box 3 is provided with a distal end exhaust pipe 52, and the distal end exhaust pipe 52 is used for discharging waste gas to a waste gas treatment center.

[0037] The exhaust buffer box 3 has a cubic structure, the exhaust buffer box 3 comprises a box body 31 and a box cover 32, a sealing gasket 33 is arranged between the box body 31 and the box cover 32, quick buckles 34 are connected between the box cover 32 and the box body 31, four quick buckles 34 are arranged, two groups of the quick buckles 34 are arranged oppositely, the distal end exhaust pipe 52 is connected to the box cover 32, and the proximal end exhaust pipe 51 is connected to a side wall of the box body 31.

[0038] The air inlet buffer tank 2 is in a cylindrical structure, and is vertically installed. The air inlet buffer tank 2 comprises a tank body 21 and a top cover 22. A sealing gasket 33 is arranged between the tank body 21 and the top cover 22. The top cover 22 is detachably connected to the tank body 21 by a threaded fastener. A proximal end air inlet pipe 41 and a distal end air inlet pipe 42 are both connected to the tank body 21.

[0039] The tank body 21 of the air inlet buffer tank 2 is provided with a liquid discharge pipe 6 at the bottom. The upper portion of the air outlet buffer tank 3 is provided with a water inlet pipe. The lower portion of the air outlet buffer tank 3 is provided with a water discharge pipe. The water inlet pipe, the water outlet pipe and the liquid discharge pipe 6 are all provided with an on-off valve 61. The water inlet pipe can supply water to the air outlet buffer tank 3. The water in the air outlet buffer tank 3 can enter the water ring vacuum pump 1 through the air outlet proximal end pipe to supply water to the water ring vacuum pump 1.

[0040] The working principle of the VOC waste gas treatment device in the embodiment of the present application is as follows: when the water ring vacuum pump 1 is working, the waste gas generated by the extruder is sucked by the negative pressure. The waste gas generated by the extruder first enters the air inlet buffer tank 2 through the distal end air inlet pipe 42, then enters the water ring vacuum pump 1 through the proximal end air inlet pipe 41, and then enters the air outlet buffer tank 3 through the proximal end air outlet pipe 51, and finally is discharged through the distal end air outlet pipe 52. Part of the components with relatively high boiling points in the waste gas are condensed in the air inlet buffer tank 2. The liquid components condensed and stored in the air inlet buffer tank 2 can be discharged through the liquid discharge pipe 6, so as to realize the pre-treatment of part of the components in the VOC waste gas. During the operation of the water ring vacuum pump 1, the air inlet buffer tank 2 is used for buffering, which is beneficial to make the operation of the waste gas treatment device more stable and reduce the influence of the fluctuation of the operation state of the water ring vacuum pump 1 on the treatment effect of the VOC waste gas.

[0041] Embodiment 2

[0042] The difference between the present embodiment and the embodiment 1 is that the structure of the air inlet buffer tank 2 is different from that of the embodiment 1.

[0043] With reference to Figure 2 , a spiral plate 23 is arranged inside the air inlet buffer tank 2. The center line of the spiral plate 23 is arranged in the vertical direction. A core column 24 is fixedly arranged at the center of the spiral plate 23. The spiral plate 23 and the core column 24 divide the inside space of the air inlet buffer tank 2 to form a spiral flow channel. The proximal end air inlet pipe 41 is connected to the upper portion of the air inlet buffer tank 2. The distal end air inlet pipe 42 is connected to the lower portion of the air inlet buffer tank 2.

[0044] The waste gas generated by the extruder enters the air inlet buffer tank 2 through the distal end air inlet pipe 42, and then flows along the spiral path from bottom to top in the air inlet buffer tank 2, so as to prolong the residence time of the waste gas in the air inlet buffer tank 2, thereby forming more liquid droplets in the air inlet buffer tank 2.

[0045] With reference to Figure 2 and Figure 3The core column 24 is a hollow tube structure, and an upper end of the core column 24 is provided with an end plate 241; the top cover 22 is provided with a plug hole 221 for the core column 24 to pass through, the upper end of the core column 24 passes out of the plug hole 221, and the upper end of the core column 24 is sleeved with a limiting ring 242, the limiting ring 242 is located on the inner side of the top cover 22, and a sealing washer 25 is arranged between the limiting ring 242 and the top cover 22; the upper end of the core column 24 is provided with an external thread, and the core column 24 is connected with a nut 26 through the external thread, when the nut 26 is locked, the limiting ring 242 and the top cover 22 clamp the sealing washer 25 together. The outer spiral edge of the spiral plate 23 abuts against the inner wall of the tank body 21.

[0046] The combined structure of the spiral plate 23 and the core column 24 can be disassembled and separated from the inside of the air inlet buffer tank 2, so that the spiral plate 23 and the air inlet buffer tank 2 can be easily cleaned.

[0047] Referring to Figure 2 and Figure 4 , a height allowance is left between the lower end of the core column 24 and the bottom wall of the air inlet buffer tank 2; a plurality of through holes 243 are arranged at intervals along the height direction of the peripheral wall of the core column 24, and the port edge of the through hole 243 away from the center of the core column 24 intersects with the upper surface of the spiral plate 23. The through hole 243 is a tapered hole, the large end of the tapered hole is away from the center line of the core column 24, and the small end of the tapered hole is inclined downward.

[0048] The outer spiral edge of the spiral plate 23 is higher than the inner spiral edge, so that the liquid droplets condensed on the upper surface of the spiral plate 23 are more easily flowed in the direction close to the core column 24, then enter the inside of the core column 24 through the through hole 243, and then drip along the inner wall of the core column 24 to the bottom of the air inlet buffer tank 2.

[0049] Referring to Figure 2 , the upper surface of the end plate 241 is provided with a semiconductor refrigeration sheet 7, the refrigeration sheet can cool the core column 24, thereby indirectly cooling the spiral plate 23, to promote the condensation of part of the gas components with relatively high boiling points in the exhaust gas. In addition, the outer surface of the air outlet buffer tank 3 can also be provided with a semiconductor refrigeration sheet 7, so as to accelerate the condensation of water molecules in the air outlet buffer tank 3.

[0050] Embodiment 3

[0051] The difference between this embodiment and embodiment 1 is that, referring to Figure 5 , the distal end air inlet pipe 42 is provided with a first driven on-off valve 43, and the distal end air outlet pipe 52 is provided with a second driven on-off valve 53. The specific structure form of the first electric on-off valve 61 and the second electric on-off valve 61 can be a ball valve or a butterfly valve, the transmission structure of the first electric on-off valve 61 and the second electric on-off valve 61 is specifically a turbine worm assembly, and the opening degree of the first electric on-off valve 61 and the second electric on-off valve 61 can be adjusted as needed.

[0052] During the operation of the water ring vacuum pump 1, the first driving on-off valve 43 is closed first, and then the second driving on-off valve 53 is closed, so that the air inlet buffer tank 2 and the air outlet buffer tank 3 can keep a certain vacuum degree. In this way, the water ring vacuum pump 1 can be intermittently operated. During the interval between two operations of the water ring vacuum pump 1, the exhaust gas of the extrusion gas is absorbed by the residual negative pressure of the air inlet buffer tank 2.

[0053] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, equivalent changes made on the basis of the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A VOC exhaust treatment device, characterized by: The application relates to a water ring vacuum pump (1), an air inlet buffer tank (2) and an air outlet buffer tank (3), a proximal air inlet pipe (41) is connected between the air inlet end of the water ring vacuum pump (1) and the air inlet buffer tank (2), the air inlet buffer tank (2) is provided with a distal air inlet pipe (42), the distal air inlet pipe (42) is used for connecting the exhaust port of an extruder; a proximal air outlet pipe (51) is connected between the air outlet end of the water ring vacuum pump (1) and the air outlet buffer tank (3), the air outlet buffer tank (3) is provided with a distal air outlet pipe (52), the distal air outlet pipe (52) is used for discharging waste gas to a waste gas treatment center; the air inlet buffer tank (2) is provided with a liquid discharge pipe (6), and the liquid discharge pipe (6) is provided with an on-off valve (61).

2. The VOC exhaust treatment device of claim 1, wherein: The distal air inlet pipe (42) is provided with a first driven on-off valve (43), and the distal air outlet pipe (52) is provided with a second driven on-off valve (53).

3. The VOC exhaust treatment device of claim 1, wherein: The air outlet buffer tank (3) comprises a tank body (31) and a tank cover (32), and a quick buckle (34) is connected between the tank cover (32) and the tank body (31).

4. The VOC exhaust treatment device of claim 2, wherein: The proximal air inlet pipe (41) is connected to the upper portion of the air inlet buffer tank (2), the distal air inlet pipe (42) is connected to the lower portion of the air inlet buffer tank (2), the inner side of the air inlet buffer tank (2) is provided with a spiral plate (23), the center line of the spiral plate (23) is arranged in the vertical direction, the center of the spiral plate (23) is provided with a core column (24), and the spiral plate (23) and the core column (24) divide the inner side space of the air inlet buffer tank (2) to form a spiral flow channel.

5. The VOC exhaust treatment device of claim 4, wherein: The core column (24) is a hollow pipe structure, the upper end of the core column (24) is provided with an end plate (241), and a height allowance is left between the lower end of the core column (24) and the bottom wall of the air inlet buffer tank (2); a plurality of through holes (243) are arranged on the peripheral wall of the core column (24) in the height direction, and the port edge of the through hole (243) away from the center of the core column (24) intersects with the upper surface of the spiral plate (23).

6. The VOC exhaust treatment device of claim 5, wherein: The outer spiral edge of the spiral plate (23) is higher than the inner spiral edge.

7. The VOC exhaust treatment device of claim 5, wherein: The through hole (243) is a taper hole, the large end of the taper hole is away from the center line of the core column (24), and the small end of the taper hole is inclined downward.

8. The VOC exhaust treatment device of claim 4, wherein: The air inlet buffer tank (2) comprises a tank body (21) and a top cover (22), the top cover (22) is detachably connected with the tank body (21); the upper end of the core column (24) is connected with the top cover (22), and the outer spiral edge of the spiral plate (23) abuts against the inner wall of the tank body (21).

9. The VOC exhaust treatment device of claim 8, wherein: The top cover (22) is provided with a insertion hole (221) for the core column (24) to pass through, the upper end of the core column (24) passes out of the insertion hole (221), the upper end of the core column (24) is provided with a limiting ring (242), the limiting ring (242) is located on the inner side of the top cover (22), and the limiting ring (242) and the top cover (22) are provided with a sealing washer (25); the upper end of the core column (24) is provided with an external thread, the core column (24) is connected with a nut (26) through the external thread, and the nut (26) abuts against the top cover (22).

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