Intensive VOC tail gas washing system

Abstract

The invention discloses an intensive VOC (volatile organic compound) tail gas washing system, relates to the technical field of VOC tail gas treatment, and solves the technical problems that a plurality of devices for tail gas containing alcohol substances occupy a large area, the temperature difference between the tail gas and a water cooler is small, and the water drop condensation effect is influenced. Comprising a water washing tower, wherein a filler section is arranged in the upper end of the water washing tower, and an adsorption heating mechanism located above the filler section is arranged in the water washing tower; by combining the water washing tower, the filler section, the adsorption heating mechanism and the water cooler, the tail gas treatment process can be integrated in one device, the occupied area of multiple devices is reduced, meanwhile, the tail gas passing through the filler section can be subjected to preliminary adsorption treatment, mixed liquid doped in the tail gas is reduced, meanwhile, the overall problem of the tail gas is solved, and the tail gas treatment efficiency is improved. The temperature difference between the tail gas and the water cooler is increased, mixed liquid water drops which are not adsorbed in the tail gas are rapidly condensed, residual mixed liquid water drops in the tail gas are removed to a great extent, tail gas emission is facilitated, and tail gas emission pollution is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of VOC tail gas treatment, and in particular is an intensive VOC tail gas water washing system. Background Art

[0002] Water-soluble media such as alcohols are important chemical raw materials. During the storage and transportation process, VOC tail gas emissions are inevitable. In order to meet the requirements of national standards, the exhaust gas must be treated, so the corresponding tail gas treatment system will be used.

[0003] In the existing exhaust gas treatment containing water-soluble media such as alcohols, the exhaust gas passes through the packing section and water washing steps. The exhaust gas passes through the adsorption liquid in the packing section, and the water-soluble impurities in the exhaust gas are dissolved in the adsorption liquid to form a mixed liquid. When the exhaust gas is discharged upward, it may carry water droplets of the mixed liquid, and the exhaust gas temperature is greatly reduced. The temperature difference at the location where the exhaust gas subsequently reaches the cooling and condensation section is small, and the condensation effect on the mixed solution water droplets carried in the exhaust gas is reduced. The exhaust gas discharge may carry uncondensed mixed liquid water droplets, thereby affecting the environment. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art; to this end, the present invention proposes an intensive VOC tail gas water washing system.

[0005] An intensive VOC tail gas water washing system comprises a water washing tower: a packing section is arranged inside the upper end of the water washing tower, an adsorption heating mechanism located above the packing section is arranged inside the water washing tower, and a water cooler is arranged above the adsorption heating mechanism; The adsorption heating mechanism comprises a guide bucket installed inside the water washing tower, a mounting shaft is vertically arranged inside the guide bucket, a heat release plate is sleeved on the upper end of the mounting shaft, and an air guide cover is arranged between the heat release plate and the guide bucket.

[0006] Preferably, a heating coil is provided at the bottom of the water washing tower.

[0007] Preferably, a drying chamber is provided inside the guide bucket, a heat release chamber is provided inside the heat release plate, and a plurality of guide blades are sleeved on the mounting shaft along its height direction.

[0008] Preferably, a liquid level gauge is provided on the side of the lower end of the water washing tower, a sewage pump is connected to the bottom of the water washing tower, and a second program-controlled valve is provided on the sewage pipe connected to the sewage pump.

[0009] Preferably, two water pipes are arranged on the right side of the lower end of the water washing tower, and low-temperature steam is introduced into the two water pipes and steam condensate is discharged respectively.

[0010] Preferably, a shielding component is provided at the upper end of the mounting shaft, and the shielding component includes a shielding cover located above the mounting shaft, an installation cavity is opened inside the upper end of the mounting shaft, an electric lifting rod is provided in the installation cavity, a plurality of support rods are provided on the circumference of the inner surface of the shielding cover, and a rotating plate is rotatably provided in the middle of the support rods.

[0011] Preferably, a mounting ring is sleeved on the mounting shaft, a rectangular hole communicating with the mounting cavity is opened on the surface of the mounting shaft, a fixed protrusion rotatably connected to the lower end of the rotating plate is provided on the circumferential surface of the mounting ring, and a connecting plate is connected to the upper end of the electric lifting rod through the rectangular hole and connected to the inner surface of the mounting ring.

[0012] Preferably, an exhaust port is provided at the upper end of the water washing tower, a water pipe is provided on the side of the upper end of the water washing tower, and a first program-controlled valve is provided on the water pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention combines a water washing tower, a packing section, an adsorption heating mechanism and a water cooler to integrate the exhaust gas treatment process into one device, thereby reducing the space occupied by multiple devices. At the same time, the exhaust gas passing through the packing section can be subjected to preliminary adsorption treatment, thereby reducing the mixed liquid mixed in the exhaust gas and improving the overall problem of the exhaust gas. The temperature difference between the exhaust gas and the water cooler is increased, and the unadsorbed mixed liquid water droplets in the exhaust gas are quickly condensed, thereby removing the residual mixed liquid water droplets in the exhaust gas to a great extent, facilitating the exhaust gas discharge and reducing the exhaust gas emission pollution.

[0014] (2) The shielding component designed in the present invention can shield the conical hole inside the guide bucket, so that the produced water will not enter the guide bucket when falling from top to bottom, which will not affect the adsorption of alcohol substances in the exhaust gas. At the same time, it will not affect the adsorption and heat release of the produced water falling on the heat release plate, which is convenient for better heating of the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the VOC tail gas washing system of the present invention; Figure 2 For the present invention Figure 1 A three-dimensional diagram of the adsorption and heating mechanism; Figure 3 For the present invention Figure 2 A cross-sectional view of the adsorption and heating mechanism; Figure 4 For the present invention Figure 3 A bottom view of the middle shielding member; Figure 5 For the present invention Figure 4 A magnified image of area A; In the figure: 1. water washing tower; 2. adsorption heating mechanism; 21. guide bucket; 22. heat release plate; 23. shielding member; 231. shielding cover; 232. electric lifting rod; 233. support rod; 234. rotating plate; 235. mounting ring; 236. rectangular hole; 237. connecting plate; 238. fixed protrusion; 24. mounting shaft; 25. guide fan blade; 26. drying chamber; 27. air guide cover; 28. heat release chamber; 29. ​​sealing ring; 210. connecting frame; 3. packing section; 4. water cooler; 5. circulating water supply; 6. circulating return water; 7. low-temperature steam; 8. steam condensate; 9. sewage pump; 10. qualified tail gas; 11. produced water; 12. first program-controlled valve; 13. second program-controlled valve; 14. level meter; 15. temperature control valve; 16. flow control valve; 17. alcohol-containing sewage. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Example 1 See also Figure 1 - Figure 3 The present application provides an intensive VOC tail gas water washing system, including a water washing tower 1: a packing section 3 is arranged inside the upper end of the water washing tower 1, and an adsorption heating mechanism 2 located above the packing section 3 is arranged inside the water washing tower 1. By combining the water washing tower 1, the packing section 3, the adsorption heating mechanism 2 and the water cooler 4, the tail gas treatment process can be integrated into one device, reducing the space occupied by multiple devices, and at the same time, the tail gas passing through the packing section 3 can be subjected to preliminary adsorption treatment, reducing the mixed liquid mixed in the tail gas, and at the same time improving the overall problem of the tail gas, increasing the temperature difference between the tail gas and the water cooler 4, allowing the unabsorbed mixed liquid water droplets in the tail gas to condense quickly, greatly removing the residual mixed liquid water droplets in the tail gas, facilitating the exhaust gas discharge, and reducing the exhaust gas emission pollution. A water cooler 4 is arranged above the adsorption heating mechanism 2, and the cooled circulating water 5 is introduced into the left side of the water cooler 4, and the cooled circulating return water 6 is discharged from the right side of the water cooler 4; The adsorption heating mechanism 2 includes a guide bucket 21 installed inside the water washing tower 1. A conical hole is left inside the guide bucket 21 to facilitate the installation of the installation shaft 24, and a connecting frame 210 is set between the installation shaft 24 and the inner wall of the conical hole to increase the installation stability of the installation shaft 24. A plurality of connecting protrusions are set between the circumferential surface of the guide bucket 21 and the inner wall of the water washing tower 1, and a distance is left between the guide bucket 21 and the inner wall of the water washing tower 1 to facilitate the subsequent liquid to flow along the outer surface of the guide bucket 21 to the bottom of the water washing tower 1, and the shape direction of the guide bucket 21 allows the exhaust gas to move upward along the inner wall, and a plurality of fine holes are opened on the inner wall of the guide bucket 21 to facilitate the exhaust gas to enter the drying chamber 26 The guide bucket 21 is in contact with the dry material, and the dry material is used to adsorb the mixed solution doped in the exhaust gas. A mounting shaft 24 is vertically arranged inside the guide bucket 21, and a heat release plate 22 is sleeved on the upper end of the mounting shaft 24. A heat release cavity 28 is opened inside the heat release plate 22, and quicklime is placed in the heat release cavity 28 to facilitate subsequent heat release to further heat up the exhaust gas. The heat release plate 22 is a circular hollow mesh structure with small holes distributed on the surface to facilitate heat release from the heat release cavity 28. An air guide hood 27 is arranged between the heat release plate 22 and the guide bucket 21. The air guide hood 27 is in the shape of an inverted bucket, so that the gas discharged from the guide bucket 21 is guided by the air guide hood 27 to act on the heat release plate 22.

[0018] In this embodiment, preferably, a heating coil is provided at the bottom of the water washing tower 1, and the bottom of the water washing tower 1 is heated by the heating coil to play an antifreeze role and facilitate the discharge of the alcohol-containing wastewater 17.

[0019] In this embodiment, preferably, a drying chamber 26 is provided inside the guide bucket 21, in which materials of the adsorption solution can be placed, and a discharge port is provided at the upper end of the guide bucket 21, in which a sealing ring 29 is provided, and a heat release chamber 28 is provided inside the heat release plate 22, and a plurality of groups of guide blades 25 are sleeved on the mounting shaft 24 along its height direction, a rotatable ring is sleeved on the mounting shaft 24, and guide blades 25 are circumferentially provided on the ring, when the exhaust gas flows upward from the bottom, the exhaust gas will impact the guide blades 25 to rotate them, thereby rotating the exhaust gas circumferentially to flow toward the inner wall of the guide bucket 21.

[0020] In this embodiment, preferably, a liquid level gauge 14 is provided on the side of the lower end of the water washing tower 1. The liquid level gauge 14 is equipped with high and low alarms and interlocks. When the liquid level is low, the interlock stops the pump, and when the liquid level is high, the first program-controlled valve 12 is closed. A sewage pump 9 is connected to the bottom of the water washing tower 1 to facilitate the discharge of alcohol-containing sewage 17. A second program-controlled valve 13 is provided on the sewage pipe connected to the sewage pump 9.

[0021] In this embodiment, preferably, two water pipes are arranged on the right side of the lower end of the water washing tower 1, and low-temperature steam 7 is introduced into the two water pipes and steam condensate 8 is discharged respectively. A temperature control valve 15 is arranged on the water pipe, and the low-temperature steam 7 can be used to cool the solution at the lower end of the water washing tower 1.

[0022] In summary, the VOC tail gas containing water-soluble media such as alcohols enters the bottom of the water scrubber 1, passes through the packing section 3 from bottom to top, and is absorbed by the reflux liquid in the packing section 3 to form a mixed liquid. The tail gas passing through the packing section 3 may carry water droplets of the mixed liquid. The tail gas will first enter the guide bucket 21 upward, and the tail gas impacts the guide blades 25 to make it rotate. The rotating guide blades 25 will diffuse the tail gas to the surrounding and pass through the inner wall of the guide bucket 21 to be adsorbed. The adsorbed tail gas continues to move upward, and water falls on the heat release plate 22 to release heat. The tail gas moves upward through the heat after heat release. The tail gas carries the temperature through the gap between the shielding cover 231 and the inner wall of the water scrubber 1 and continues to move upward. The tail gas and the water The cooler 4 forms a large temperature difference, and the mixed liquid water droplets remaining in the exhaust gas quickly condense and drip downward, thereby removing the residual mixed liquid water droplets in the exhaust gas to a great extent, reducing the impact and pollution on the surrounding environment, and finally meeting the discharge standards. The production water 11 washes the exhaust gas from the top of the water washing tower 1, and the production water 11 after absorbing the alcohol is refluxed at the bottom of the water washing tower 1 by the sewage pump 9, and enters the top of the water washing tower 1 together with the supplemented production water 11 as the reflux liquid of the system, and absorbs the exhaust gas from top to bottom again. During normal operation, the sewage pump 9 is only used for reflux, and the waste water is not discharged. When the reflux liquid reaches a certain concentration, the second programmable valve 13 is opened to intermittently discharge the system for treatment.

[0023] Example 2 Reference Figure 4 and Figure 5 , which is the second embodiment of the present invention, and this embodiment is different from the previous embodiment.

[0024] In this embodiment, preferably, a shielding member 23 is provided at the upper end of the mounting shaft 24. The shielding member 23 can be used to shield the tapered hole inside the guide bucket 21, so that the produced water 11 will not enter the guide bucket 21 when falling from top to bottom, and will not affect the adsorption of alcohol substances in the tail gas. At the same time, it will not affect the adsorption and heat release of the produced water 11 falling on the heat release plate 22, so as to better heat the tail gas. The shielding member 23 includes a shielding cover 231 located above the mounting shaft 24, and a mounting cavity is opened inside the upper end of the mounting shaft 24. An electric lifting rod 232 is provided in the mounting cavity. The rod inside the electric lifting rod 232 can change the height of the mounting ring 235 by telescoping. A plurality of support rods 233 are provided on the circumference of the inner surface of the shielding cover 231 to support the shielding cover 231. The shielding cover 231 is made of waterproof soft material, which is convenient for unfolding and folding to a certain extent for storage. A rotating plate 234 is rotatably arranged in the middle of the support rod 233, and a mounting ring 235 is sleeved on the mounting shaft 24. The upper end of the mounting shaft 24 can extend to the lower surface of the center of the shielding cover 231, and the inner end of the support rod 233 is rotatably connected to the upper end of the mounting shaft 24. A rectangular hole 236 communicating with the mounting cavity is opened on the surface of the mounting shaft 24, and a fixed protrusion 238 rotatably connected to the lower end of the rotating plate 234 is arranged on the circumferential surface of the mounting ring 235. As the mounting ring 235 rises and falls, the rotating plate 234 is convenient to rotate and change the angle with the vertical direction. The upper end of the electric lifting rod 232 is connected with a connecting plate 237 that passes through the rectangular hole 236 and is connected to the inner surface of the mounting ring 235.

[0025] In this embodiment, preferably, an exhaust port is provided at the upper end of the water washing tower 1 to facilitate the discharge of the exhaust gas 10 that meets the standards, a water pipe is provided on the side of the upper end of the water washing tower 1, and a first programmable valve 12 is provided on the water pipe. The water pipe can be passed into the production water 11, and the production water 11 acts on the exhaust gas from top to bottom, and can absorb alcohol substances in the exhaust gas and fall to the bottom of the water washing tower 1. A flow control valve 16 is provided between the water pipe and the sewage pipe for controlling the liquid flow inside the two.

[0026] In summary, when in use, when it is not necessary to heat the exhaust gas, the rod inside the electric lifting rod 232 extends, which will drive the connecting plate 237 to move upward in the rectangular hole 236, drive the mounting ring 235 to move upward, and the rotating plate 234 rotates outward as the mounting ring 235 moves upward, thereby driving the support rod 233 and the shielding cover 231 to expand outward. The expansion diameter of the shielding cover 231 is larger than the diameter of the upper end of the heat release plate 22 and the guide bucket 21, so that the production water 11 will not act on the heat release plate 22 when falling downward, but will fall downward along the outer surface of the guide bucket 21. When it is necessary to heat the exhaust gas, the rod inside the electric lifting rod 232 is retracted, and the shielding cover 231 is expanded outward. The movable mounting ring 235 moves downward, and the angle between the rotating plate 234 and the vertical direction gradually decreases, driving the shielding cover 231 to be gradually retracted, and the diameter gradually decreases, until it is smaller than the diameter of the heat release plate 22 and still larger than the diameter of the upper end of the guide bucket 21, water falls on the heat release plate 22 to release heat, and the exhaust gas discharged upward from the guide bucket 21 will pass through the heat release plate 22, and the exhaust gas is further heated by the heat released by the heat release plate 22, so that the exhaust gas moves upward to the water cooler 4, and the high-temperature exhaust gas will quickly condense when it contacts the low-temperature water cooler 4, so that the water droplets of the mixed solution carried in the exhaust gas will condense and be removed, and the exhaust gas without the water droplets can meet the emission standards, thereby reducing pollution to the surrounding environment.

[0027] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. An intensive VOC tail gas washing system, characterized in that: It comprises a water washing tower (1): a packing section (3) is arranged inside the upper end of the water washing tower (1), an adsorption heating mechanism (2) located above the packing section (3) is arranged inside the water washing tower (1), and a water cooler (4) is arranged above the adsorption heating mechanism (2); The adsorption temperature-raising mechanism (2) comprises a guide bucket (21) installed inside the water washing tower (1), a mounting shaft (24) being vertically arranged inside the guide bucket (21), a heat release plate (22) being sleeved on the upper end of the mounting shaft (24), and an air guide cover (27) being arranged between the heat release plate (22) and the guide bucket (21).

2. The intensive VOC tail gas water washing system according to claim 1, characterized in that: A heating coil is provided at the bottom of the water washing tower (1).

3. The intensive VOC tail gas water washing system according to claim 1, characterized in that: A drying chamber (26) is provided inside the guide bucket (21), a heat release chamber (28) is provided inside the heat release plate (22), and a plurality of groups of guide blades (25) are sleeved on the mounting shaft (24) along its height direction.

4. The intensive VOC tail gas water washing system according to claim 1, characterized in that: A liquid level meter (14) is provided on the side of the lower end of the water washing tower (1), a sewage pump (9) is connected to the bottom of the water washing tower (1), and a second programmable valve (13) is provided on the sewage pipe connected to the sewage pump (9).

5. The intensive VOC tail gas washing system according to claim 1, characterized in that: Two water pipes are arranged on the right side of the lower end of the water washing tower (1), and low-temperature steam (7) is introduced into the two water pipes and steam condensate (8) is discharged respectively.

6. The intensive VOC tail gas water washing system according to claim 1, characterized in that: A shielding component (23) is arranged at the upper end of the installation shaft (24), the shielding component (23) comprising a shielding cover (231) located above the installation shaft (24), a mounting cavity is provided inside the upper end of the installation shaft (24), an electric lifting rod (232) is arranged in the mounting cavity, a plurality of support rods (233) are arranged on the circumference of the inner surface of the shielding cover (231), and a rotating plate (234) is rotatably arranged in the middle of the support rod (233).

7. The intensive VOC tail gas water washing system according to claim 6, characterized in that: A mounting ring (235) is sleeved on the mounting shaft (24); a rectangular hole (236) communicating with the mounting cavity is formed on the surface of the mounting shaft (24); a fixing protrusion (238) rotatably connected to the lower end of the rotating plate (234) is formed on the circumferential surface of the mounting ring (235); and a connecting plate (237) is connected to the upper end of the electric lifting rod (232) and passes through the rectangular hole (236) and is connected to the inner surface of the mounting ring (235).

8. The intensive VOC tail gas water washing system according to claim 1, characterized in that: An exhaust port is provided at the upper end of the water washing tower (1), a water pipe is provided on the side of the upper end of the water washing tower (1), and a first programmable valve (12) is provided on the water pipe.

Images