A waste gas treatment system

Abstract

This utility model provides a waste gas treatment system, relating to the field of waste gas treatment technology. The system includes a waste gas absorption tower, a spray mechanism housed within the absorption tower, a waste gas inlet pipe connected to the lower part of the absorption tower via the spray mechanism, and an exhaust pipe connected to the top of the absorption tower. An alkaline solution circulation unit is provided between the bottom of the absorption tower and the spray mechanism. This unit includes an alkaline solution circulation tank, a filter, an alkaline solution circulation pump, and a heat exchanger connected in sequence. The circulation tank is connected to the bottom of the absorption tower, and the heat exchanger is connected to the spray mechanism. This utility model filters impurities in the circulating alkaline solution, preventing blockages in pipes or equipment.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, and specifically to a waste gas treatment system. Background Technology

[0002] According to the "General Technical Requirements for Chlorine Safety Facilities in Chlor-Alkali Production" (T / CCASC 1003--2021), chlor-alkali production processes must be equipped with emergency chlorine treatment devices, i.e., waste gas treatment systems. As core safety and environmental protection devices for chlor-alkali enterprises, waste gas treatment systems play a crucial role in the harmless treatment of waste gas.

[0003] Currently, during system operation, due to the complex sources of waste gas and the diverse composition of the mixed gas, long-term circulation easily generates scale and various types of precipitates. The main product of the waste gas absorption process, sodium hypochlorite solution, has a significantly different solubility as the temperature rises. When the saturated liquid cools down, it will crystallize and precipitate. Therefore, crystals and precipitates will accumulate in the pipes or plate heat exchanger plates, causing blockage. Utility Model Content

[0004] The purpose of this invention is to develop a waste gas treatment system that filters impurities in circulating alkaline solution to prevent pipe or equipment blockage.

[0005] This utility model is achieved through the following technical solution:

[0006] An exhaust gas treatment system, comprising:

[0007] Waste gas absorption tower;

[0008] The spraying mechanism is located inside the waste gas absorption tower;

[0009] The exhaust gas inlet pipe is connected to the exhaust gas absorption tower at the bottom of the spraying mechanism;

[0010] The exhaust pipe is connected to the top of the waste gas absorption tower;

[0011] The waste gas absorption tower is equipped with an alkaline solution circulation unit between its bottom and the spraying mechanism. The alkaline solution circulation unit includes an alkaline solution circulation tank, a filter, an alkaline solution circulation pump, and a heat exchanger connected in sequence. The alkaline solution circulation tank is connected to the bottom of the waste gas absorption tower, and the heat exchanger is connected to the spraying mechanism.

[0012] Optionally, the alkali circulation unit includes two alkali circulation tanks and two alkali circulation pumps. The tops of the two alkali circulation tanks are connected to the bottom pipeline of the waste gas absorption tower, and the bottoms of the two alkali circulation tanks are connected to the inlet pipelines of the two alkali circulation pumps. The filter is installed on the pipeline between the alkali circulation tanks and the alkali circulation pumps.

[0013] Optionally, the top of the two alkaline circulation tanks is also provided with a gas pipe that communicates with the middle of the waste gas absorption tower. The connection between the gas pipe and the waste gas absorption tower is located below the spraying mechanism and above the waste gas inlet pipe.

[0014] Optionally, the filter includes a housing, inside which is a cylindrical filter screen. A baffle is provided at the top edge of the filter screen. An inlet pipe and an outlet pipe are respectively connected to the housing on both sides of the baffle. A drain pipe is connected to the bottom of the housing, and a valve is provided on the drain pipe.

[0015] Optionally, the baffle is inclined, the top of the filter screen is obliquely shaped, the shape of the baffle is adapted to the inner wall of the housing, the edge of the baffle contacts the inner wall of the housing, and a support plate is provided on the inner wall of the housing at the bottom of the baffle.

[0016] Optionally, the filter screen has openings at the top and bottom, the upper part of the filter screen is cylindrical and the lower part is a frustum-shaped structure with the smaller diameter end facing down, the bottom inner side of the filter screen is provided with a liftable baffle, the top of the housing is connected to a liquid injection pipe, and valves are provided on the liquid inlet pipe, liquid outlet pipe and liquid injection pipe.

[0017] Optionally, the bottom inner edge of the filter screen is provided with an inwardly extending retaining ring, the bottom edge of the retaining cover is engaged with the retaining ring, and the bottom edge of the retaining ring is provided with a sealing gasket that contacts the retaining ring.

[0018] Optionally, the baffle is conical with the tapered part facing upwards, and a pull rod is connected to the center of the top of the baffle. The pull rod is slidably and sealingly connected to the top of the housing, and the top of the pull rod is outside the housing and connected to a pull ring.

[0019] Optionally, a spring is connected to the inner wall of the top of the housing and sleeved around the pull rod. A support plate is provided at the bottom end of the spring and the support plate is connected to the pull rod.

[0020] Optionally, the top flange of the housing is connected to a sealing plate, the injection tube is disposed on the sealing plate, the pull rod is slidably and sealingly connected to the sealing plate, and the spring is disposed at the bottom of the sealing plate.

[0021] The beneficial effects of this utility model are:

[0022] This invention filters the alkaline solution during the alkaline solution circulation process, preventing impurities from entering the pipes and equipment and causing blockages. The filter can quickly clean impurities without disassembly, and the cleaning operation is simple, greatly improving the impurity cleaning efficiency and allowing the filter to be put into use as soon as possible. This significantly extends the time required to remove the sealing plate for cleaning the inside of the housing, thus increasing the effective service life of the filter. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural diagram of the present utility model;

[0025] Figure 2 This is a diagram of the filter structure.

[0026] Figure 3 This is a diagram of the bottom structure of the sealing plate;

[0027] Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0028] Reference numerals in the attached drawings: 1. Alkali circulation tank; 2. Filter; 21. Shell; 22. Inlet pipe; 23. Outlet pipe; 24. Drain pipe; 25. Baffle; 26. Support plate; 27. Filter screen; 28. Tie rod; 29. ​​Pull ring; 210. Injection pipe; 211. Sealing plate; 212. Support plate; 213. Spring; 214. Baffle; 215. Baffle ring; 216. Sealing gasket; 3. Alkali circulation pump; 4. Heat exchanger; 5. Gas pipe; 6. Exhaust pipe; 7. Waste gas inlet pipe; 8. Waste gas absorption tower. Detailed Implementation

[0029] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0031] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0032] like Figures 1-4 As shown, this utility model discloses a waste gas treatment system, including a waste gas absorption tower 8, a spraying mechanism in the upper part of the waste gas absorption tower 8, a waste gas inlet pipe 7 in the middle of the waste gas absorption tower 8, and an exhaust pipe 6 at the top of the waste gas absorption tower 8.

[0033] An alkaline solution circulation unit is installed between the bottom of the waste gas absorption tower 8 and the spraying mechanism. After the alkaline solution sprayed by the spraying mechanism comes into contact with the waste gas, it enters the alkaline solution circulation unit from the bottom of the waste gas absorption tower 8. The alkaline solution circulation unit filters the alkaline solution and then returns it to the spraying mechanism for continued spraying.

[0034] The alkali circulation unit includes two alkali circulation tanks 1 and two alkali circulation pumps 3. The tops of the two alkali circulation tanks 1 are connected to the bottom of the waste gas absorption tower 8 via pipelines. The tops of the two alkali circulation tanks 1 are also equipped with gas pipes 5 that connect to the middle of the waste gas absorption tower 8. The connection point between the gas pipes 5 and the waste gas absorption tower 8 is located below the spray mechanism and above the waste gas inlet pipe 7. The volatile gases from the alkali in the alkali circulation tanks 1 enter the waste gas absorption tower 8 through the gas pipes 5. The bottoms of both alkali circulation tanks 1 are connected to the inlet pipelines of the two alkali circulation pumps 3. A filter 2 is installed on the pipeline between the alkali circulation tanks 1 and the alkali circulation pumps 3. The alkali output from the alkali circulation tanks 1 is filtered by the filter 2 before entering the alkali circulation pumps 3.

[0035] The filter 2 includes a housing 21. A sealing plate 211 is connected to the top flange of the housing 21. A liquid injection pipe 210 is provided on the sealing plate 211, communicating with the interior of the housing 21. A valve is provided on the liquid injection pipe 210. An inlet pipe 22 and an outlet pipe 23 are connected to the side wall of the housing 21, and both the inlet pipe 22 and the outlet pipe 23 are provided with valves. A drain pipe 24 is connected to the bottom of the housing 21, and a valve is provided on the drain pipe 24.

[0036] The housing 21 contains a filter screen 27, which is cylindrical with openings at the top and bottom. The upper part of the filter screen 27 is cylindrical, while the lower part is a frustum-shaped cone with the smaller diameter end facing downwards. A baffle 25 is connected to the outer edge of the top of the filter screen 27, and the baffle 25 is inclined, corresponding to the beveled opening at the top of the filter screen 27. The shape of the baffle 25 is adapted to the inner wall of the housing 21, and the edge of the baffle 25 contacts the inner wall of the housing 21. The inlet pipe 22 and the outlet pipe 23 are located on opposite sides of the baffle 25. Liquid entering the housing 21 through the inlet pipe 22 must pass through the filter screen 27 to enter the outlet pipe 23. A support plate 26 is provided on the inner wall of the housing 21 at the bottom of the baffle 25. The filter screen 27 can be moved upwards to remove the housing 21. After the filter screen 27 is placed back into the housing 21, the baffle 25 rests against the support plate 26.

[0037] The filter screen 27 has an inwardly extending retaining ring 215 at its bottom inner edge, and a liftable retaining cover 214 on the bottom inner side of the filter screen 27. The retaining cover 214 is a cone shape with the cone facing upward. The bottom edge of the retaining cover 214 fits with the retaining ring 215. The bottom edge of the retaining ring 215 is also provided with a sealing gasket 216. The retaining cover 214 presses on the retaining ring 215, and the sealing gasket 216 at the bottom edge of the retaining cover 214 is in close contact with the retaining ring 215 to achieve a seal.

[0038] A pull rod 28 is connected to the center of the top of the cover 214. The pull rod 28 is vertically positioned and slidably sealed to the sealing plate 211. The top of the pull rod 28 is located outside the housing 21, and a pull ring 29 is provided at the top of the pull rod 28. The pull rod 28 can be manually pulled through the pull ring 29 to slide, thereby raising and lowering the cover 214. A spring 213 is connected to the bottom of the sealing plate 211 and is sleeved around the pull rod 28. A support plate 212 is provided at the bottom of the spring 213 and is connected to the pull rod 28. When no external force is applied, the elastic force of the spring 213 causes the support plate 212 to be pushed downward, which, through the pull rod 28, causes the cover 214 to press against the retaining ring 215. Pulling the pull ring 29 raises the pull rod 28, compresses the spring 213, and allows the cover 214 to move upward and disengage from the retaining ring 215.

[0039] An observation window (not shown in the figure) is provided on the outer wall of the housing 21. The observation window is made of transparent material, and the condition of the filter screen 27 can be observed through the observation window to obtain the accumulation of impurities in the filter screen 27.

[0040] The outlet ends of the two alkali circulation pumps 3 are connected to the spray mechanism pipeline, and a heat exchanger 4 is installed on the pipeline. The alkali solution transported by the alkali circulation pump 3 is cooled by the heat exchanger 4 and then sent to the spray mechanism for spraying. In the heat exchanger 4, the alkali solution exchanges heat with the circulating cooling water to achieve cooling.

[0041] In operation, the alkaline solution circulates to treat the waste gas. When the alkaline solution circulates to filter 2, the precipitates and crystals in the alkaline solution are filtered out in filter 2, preventing them from entering the pipes or equipment of the alkaline solution circulation unit and causing blockage. In filter 2, the impurities filtered by filter screen 27 accumulate on baffle 214. When cleaning filter 2 periodically, the valves on inlet pipe 22 and outlet pipe 23 can be temporarily closed, while the valve on drain pipe 24 remains closed. Then, the valve on injection pipe 210 is opened, and cleaning solution (water) is injected into housing 21 through injection pipe 210. Then, the valve on drain pipe 24 is opened, and at the same time, the pull ring 29 is pulled upwards, causing baffle 214 to rise and no longer be in close contact with baffle ring 215, allowing the cleaning solution to be released. The wastewater is discharged through the drain pipe 24. During this process, because the lower part of the filter screen 27 is frustoconical, as the baffle 214 rises, the gap between the edge of the baffle 214 and the filter screen 27 continuously increases. The baffle 214 is also conical. Impurities on the baffle 214 and inside the filter screen 27 are washed away by the cleaning fluid. The impurities are discharged through the drain pipe 24 with the cleaning fluid. Then, the valve of the drain pipe 24 can be closed again, and the housing 21 can be filled with cleaning fluid for repeated rinsing. The number of rinsing times can be selected by observing the condition of the filter screen 27 through the observation window. After rinsing, the cleaning fluid in the housing 21 is drained, the valves on the injection pipe 210 and the drain pipe 24 are closed, and then the valves on the inlet pipe 22 and the outlet pipe 23 are opened, allowing the filter 2 to filter. When the filter screen 27 has been used for a long time and stubborn impurities that are difficult to rinse are attached to it, the sealing plate 211 can be opened to remove the filter screen 27 for cleaning.

[0042] This invention filters the alkaline solution during the alkaline solution circulation process, preventing impurities from entering the pipes and equipment and causing blockages. The filter 2 can quickly clean impurities without disassembly, and the cleaning operation is simple, greatly improving the impurity cleaning efficiency and allowing the filter 2 to be put into use as soon as possible. This significantly extends the time required to remove the sealing plate 211 to clean the inside of the housing 21, thus increasing the effective service life of the filter 2.

[0043] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A waste gas treatment system, characterized in that, include: Waste gas absorption tower; The spraying mechanism is located inside the waste gas absorption tower; The exhaust gas inlet pipe is connected to the exhaust gas absorption tower at the bottom of the spraying mechanism; The exhaust pipe is connected to the top of the waste gas absorption tower; The waste gas absorption tower is equipped with an alkaline solution circulation unit between its bottom and the spraying mechanism. The alkaline solution circulation unit includes an alkaline solution circulation tank, a filter, an alkaline solution circulation pump, and a heat exchanger connected in sequence. The alkaline solution circulation tank is connected to the bottom of the waste gas absorption tower, and the heat exchanger is connected to the spraying mechanism.

2. The waste gas treatment system according to claim 1, characterized in that, The alkali circulation unit includes two alkali circulation tanks and two alkali circulation pumps. The tops of the two alkali circulation tanks are connected to the bottom pipes of the waste gas absorption tower, and the bottoms of the two alkali circulation tanks are connected to the inlet pipes of the two alkali circulation pumps. The filter is located on the pipe between the alkali circulation tanks and the alkali circulation pumps.

3. The waste gas treatment system according to claim 2, characterized in that, The top of the two alkaline circulation tanks is also provided with a gas pipe that communicates with the middle of the waste gas absorption tower. The connection between the gas pipe and the waste gas absorption tower is located below the spraying mechanism and above the waste gas inlet pipe.

4. The waste gas treatment system according to any one of claims 1 to 3, characterized in that, The filter includes a housing, inside which is a cylindrical filter screen. A baffle is provided at the top edge of the filter screen. An inlet pipe and an outlet pipe are respectively connected to the housing on both sides of the baffle. A drain pipe is connected to the bottom of the housing, and a valve is provided on the drain pipe.

5. The waste gas treatment system according to claim 4, characterized in that, The baffle is inclined, the top of the filter screen is obliquely shaped, the shape of the baffle is adapted to the inner wall of the shell, the edge of the baffle is in contact with the inner wall of the shell, and a support plate is provided on the inner wall of the shell at the bottom of the baffle.

6. The waste gas treatment system according to claim 4, characterized in that, The filter screen has openings at the top and bottom. The upper part of the filter screen is cylindrical and the lower part is a frustum-shaped structure with the smaller diameter end facing down. The bottom inner side of the filter screen is provided with a liftable baffle. The top of the housing is connected to a liquid injection pipe. Valves are provided on the liquid inlet pipe, liquid outlet pipe, and liquid injection pipe.

7. The waste gas treatment system according to claim 6, characterized in that, The filter screen has an inwardly extending retaining ring at its bottom inner edge. The bottom edge of the retaining cover mates with the retaining ring, and the bottom edge of the retaining ring has a sealing gasket that contacts the retaining ring.

8. The waste gas treatment system according to claim 7, characterized in that, The baffle is conical with its cone-shaped portion facing upwards. A pull rod is connected to the center of the top of the baffle. The pull rod is slidably and sealed to the top of the housing. The top of the pull rod is outside the housing and is connected to a pull ring.

9. The waste gas treatment system according to claim 8, characterized in that, A spring is connected to the inner wall of the top of the housing and sleeved around the pull rod. A support plate is provided at the bottom of the spring and the support plate is connected to the pull rod.

10. The waste gas treatment system according to claim 9, characterized in that, The top flange of the housing is connected to a sealing plate, the injection tube is located on the sealing plate, the pull rod is slidably and sealingly connected to the sealing plate, and the spring is located at the bottom of the sealing plate.

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