Acetylene cleaning tower waste acid recovery device

Abstract

The utility model relates to the technical field of acetylene purification equipment, in particular to an acetylene purification tower waste acid recovery device which comprises a purification tower, the inlet end of the filter is connected with the bottom of the cleaning tower, and the outlet end of the filter is sequentially connected with a circulating pump and the cleaning tower; the inlet end of the diaphragm pump is connected with the inlet end of the filter, and the outlet end of the diaphragm pump is connected with a buffer tank and a waste acid treatment device. When the acetylene cleaning tower disclosed by the utility model is overhauled or the filter screen is cleaned, waste acid in the cleaning tower is recycled and is prevented from directly entering a trench and a liquid collecting pit.

Description

Technical Field

[0001] The utility model relates to the technical field of acetylene purification equipment, in particular to a waste acid recovery device for an acetylene purification tower. Background Art

[0002] Acetylene is a colorless and highly flammable gas with a faint floral fragrance. Industrially, acetylene is mainly used as a fuel for welding and cutting metals, and is also used in the production of chemical products such as polyvinyl chloride (PVC), vinyl acetate, and vinyl chloride.

[0003] In the preparation of acetylene by the calcium carbide method, when the sulfuric acid purification tower of the acetylene purification device is under maintenance or the filter screen is cleaned, the waste sulfuric acid will be discharged into the liquid collecting pit through the trench. At the same time, the waste liquid discharged from the trench also includes alkali liquor and waste water, which will mix with the waste acid liquid to generate a large amount of heat. The increase in temperature will damage the trench, increase the risk of acid-base injury to on-site personnel, and the large amount of heat will damage the tetrafluoro lining of the pump and pipeline, ultimately leading to damage to the equipment and pipeline. The waste liquid in the liquid collecting pit is transported by a pump to the clear liquid pool of the pressure filtration device and finally enters the thickening pool. Due to the high concentration of the acid liquid, a large amount of foam will be generated when reacting with calcium hydroxide in the thickening pool, affecting the normal operation of the thickener and increasing the maintenance period of the purification tower, and there are also potential safety hazards at the same time.

[0004] Therefore, those skilled in the art are committed to developing a waste acid recovery device for an acetylene purification tower, which can recover the waste acid in the purification tower when the purification tower is under maintenance or the filter screen is cleaned, and avoid directly entering the trench and the liquid collecting pit. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a waste acid recovery device for an acetylene purification tower, which can recover the waste acid in the purification tower when the purification tower is under maintenance or the filter screen is cleaned, and avoid directly entering the trench and the liquid collecting pit.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] A waste acid recovery device for an acetylene purification tower, comprising

[0008] A purification tower;

[0009] A filter, the inlet end of the filter is connected to the bottom of the purification tower, and the outlet end of the filter is sequentially connected with a circulation pump and the purification tower;

[0010] A diaphragm pump, the inlet end of the diaphragm pump is connected to the inlet end of the filter, and the outlet end of the diaphragm pump is connected with a buffer tank and a waste acid treatment device.

[0011] The beneficial effects of adopting the above scheme are: when the acetylene purification tower is overhauled or the filter screen is cleaned, the diaphragm pump pumps the waste acid that has not passed through the filter into the buffer tank, and then the waste acid is further treated by the waste acid treatment device, avoiding direct discharge of the waste acid into the ditch or the sump, which may cause a large amount of heat or damage to other equipment;

[0012] The diaphragm of the diaphragm pump can isolate the waste acid, reduce the damage of the waste acid to the pump body, and extend the service life of the pump body. At the same time, the diaphragm pump can transport particles and mud of a certain size, which is conducive to the discharge of impurities in the acetylene purification tower.

[0013] On the basis of the above technical solution, the present invention can also be improved as follows.

[0014] Furthermore, the inlet end of the diaphragm pump is connected to the filter via a hose, and a quick connector for connecting to the inlet end of the filter is installed at the end of the hose.

[0015] The beneficial effect of adopting the above further solution is that the connecting hose and the quick connector facilitate rapid connection between the diaphragm pump and the filter inlet end, and the waste acid is quickly transported to the designated area.

[0016] Furthermore, the outlet end of the diaphragm pump is connected to the buffer tank via an intermediate pipe, and a stop valve and a one-way valve are installed on the intermediate pipe near the diaphragm pump.

[0017] The beneficial effect of adopting the above further solution is that the stop check valve and the one-way valve prevent the waste acid and impurities in the intermediate pipe from flowing back.

[0018] Furthermore, the intermediate pipe is connected to a nitrogen purge pipe, and a stop check valve is installed on the nitrogen purge pipe.

[0019] The beneficial effect of adopting the above further scheme is that nitrogen is used for purging and replacement, and nitrogen is used for purging and replacement after the waste acid is transported to avoid pipeline blockage.

[0020] Furthermore, the intermediate pipe is also connected to a waste acid storage pipe, and a boundary valve is installed on the waste acid storage pipe.

[0021] The beneficial effect of adopting the above further scheme is that the waste acid in the waste acid storage bin is passed into the buffer tank through the storage waste acid pipe, which is conducive to the unified treatment and recovery of the waste acid.

[0022] Furthermore, the waste acid treatment device includes a filter tower, the bottom of which is connected to the buffer tank, at least one layer of filter components is installed in the filter tower, and the upper layer of the filter tower is connected to the feed storage tank of the waste sulfuric acid recovery cracking furnace through a connecting pipe.

[0023] The beneficial effects of adopting the above further solution are as follows: The filtration component filters out the particulate impurities in the waste acid, which is conducive to further recycling and purification of the waste acid subsequently.

[0024] Furthermore, the bottom of the filtration tower is provided with a waste residue outlet.

[0025] The beneficial effects of adopting the above further solution are as follows: The waste residue outlet is conducive to transporting the waste residue filtered in the filtration tower to a designated area. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of a waste acid recovery device for an acetylene purification tower in a specific embodiment of the present invention.

[0027] In the drawings, the list of components represented by each reference numeral is as follows:

[0028] 1, purification tower; 2, filter; 3, circulation pump; 4, diaphragm pump; 5, buffer tank; 6, hose; 7, quick connector; 8, intermediate pipe; 9, stop valve; 10, check valve; 11, purge nitrogen pipe; 12, stop check valve; 13, storage waste acid pipe; 14, boundary valve; 15, filtration tower; 16, filtration component; 17, feed storage tank; 18, waste residue outlet. Specific Embodiments

[0029] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential direction", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0031] In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figure 1 As shown, an acetylene purification tower waste acid recovery device comprises

[0034] Purification Tower 1;

[0035] Filter 2, the inlet end of filter 2 is connected to the bottom of purification tower 1, and the outlet end of filter 2 is connected to circulation pump 3 and purification tower 1 in sequence;

[0036] The diaphragm pump 4 has an inlet end connected to the inlet end of the filter 2, and an outlet end of the diaphragm pump 4 is connected to a buffer tank 5 and a waste acid treatment device.

[0037] In the utility model, when the acetylene purification tower 1 is overhauled or the filter screen is cleaned, the diaphragm pump 4 pumps the waste acid that has not passed through the filter 2 into the buffer tank 5, and then the waste acid is further treated by the waste acid treatment device, so as to avoid directly discharging the waste acid into the ditch or the sump, which may cause a large amount of heat or damage to other equipment;

[0038] The diaphragm of the diaphragm pump 4 can isolate the waste acid, reduce the damage of the waste acid to the pump body, and extend the service life of the pump body. At the same time, the diaphragm pump 4 can transport particles and mud of a certain size, which is conducive to the discharge of impurities in the acetylene purification tower 1.

[0039] like Figure 1 As shown, in some embodiments, the temperature of the purification tower 1 is generally controlled at 10°C-15°C, and the concentration of sulfuric acid in the purification tower 1 should be maintained at more than 90% to ensure effective removal of impurities such as hydrogen sulfide (H2S) and phosphine (PH3) in acetylene. At the same time, a temperature, pressure, flow and other control systems are installed on the purification tower 1. The concentrated sulfuric acid in the purification tower 1 flows from the bottom of the purification tower 1 to the filter 2. After the filter 2 filters the impurities in the concentrated sulfuric acid, it is pumped into the purification tower 1 through the circulation pump 3 to reduce the mixing of solid impurities in the concentrated sulfuric acid.

[0040] In another embodiment, the inlet end of the diaphragm pump 4 is connected to the filter 2 via a hose 6, and a quick connector 7 for connecting to the inlet end of the filter 2 is installed at the end of the hose 6. The quick connector 7 facilitates the connection between the diaphragm pump 4 and the filter 2 to transport the waste acid to a designated area.

[0041] The outlet end of the diaphragm pump 4 is connected to the buffer tank 5 through an intermediate pipe 8. A stop valve 9 and a check valve 10 are installed on the intermediate pipe 8 near the diaphragm pump 4. The intermediate pipe 8 is connected to a purging nitrogen pipe 11, and a stop check valve 12 is installed on the purging nitrogen pipe 11. The intermediate pipe 8 is also connected to a storage waste acid pipe 13, and a boundary valve 14 is installed on the storage waste acid pipe 13. The high-pressure nitrogen blown out from the purging nitrogen pipe 11 is used for purging and replacement. After the waste acid transportation is completed, nitrogen is used for purging and replacement to avoid pipeline blockage. At the same time, the waste acid in the waste acid storage bin is introduced into the buffer tank 5 through the storage waste acid pipe 13, which is conducive to the unified treatment and recovery of the waste acid.

[0042] In other embodiments, the waste acid treatment device includes a filtration tower 15. The bottom of the filtration tower 15 has a waste residue outlet 18. The bottom of the filtration tower 15 is communicated with the buffer tank 5. At least one layer of filtration components 16 is installed in the filtration tower 15. The waste residue outlet 18 is used to discharge the solid impurities filtered in the filtration tower 15 to a designated area for further treatment. The upper layer of the filtration tower 15 is connected to the feed storage tank 17 of the waste sulfuric acid recovery cracking furnace through a connecting pipe.

[0043] In some embodiments, in the feed storage tank 17 of the waste sulfuric acid recovery cracking furnace, the waste sulfuric acid is cracked into flue gas mainly composed of sulfur dioxide at a temperature of 1000 - 1100 °C, converted into sulfur trioxide under the action of a vanadium pentoxide catalyst, and then absorbed by 98% sulfuric acid. After adding desalted water to balance the acid concentration, clean concentrated sulfuric acid is obtained.

[0044] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0045] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An acetylene purification tower waste acid recovery device, characterized in that: include Purification Tower (1); A filter (2), wherein the inlet end of the filter (2) is connected to the bottom of the purification tower (1), and the outlet end of the filter (2) is connected to a circulation pump (3) and the purification tower (1) in sequence; A diaphragm pump (4), wherein the inlet end of the diaphragm pump (4) is connected to the inlet end of the filter (2), and the outlet end of the diaphragm pump (4) is connected to a buffer tank (5) and a waste acid treatment device.

2. The acetylene purification tower waste acid recovery device according to claim 1, characterized in that: The inlet end of the diaphragm pump (4) is connected to the filter (2) via a hose (6), and a quick connector (7) for connecting to the inlet end of the filter (2) is installed at the end of the hose (6).

3. The acetylene purification tower waste acid recovery device according to claim 1, characterized in that: The outlet end of the diaphragm pump (4) is connected to the buffer tank (5) via an intermediate pipe (8), and a stop valve (9) and a one-way valve (10) are installed on the intermediate pipe (8) near the diaphragm pump (4).

4. The acetylene purification tower waste acid recovery device according to claim 3 is characterized in that: The intermediate pipe (8) is connected to a nitrogen purge pipe (11), and a stop check valve (12) is installed on the nitrogen purge pipe (11).

5. The acetylene purification tower waste acid recovery device according to claim 3 is characterized in that: The intermediate pipe (8) is also connected to a waste acid storage pipe (13), and a boundary valve (14) is installed on the waste acid storage pipe (13).

6. The acetylene purification tower waste acid recovery device according to claim 1, characterized in that: The waste acid treatment device comprises a filter tower (15), the bottom of the filter tower (15) is communicated with the buffer tank (5), at least one layer of filter components (16) is installed in the filter tower (15), and the upper layer of the filter tower (15) is connected to a feed storage tank (17) of a waste sulfuric acid recovery cracking furnace through a connecting pipe.

7. The acetylene purification tower waste acid recovery device according to claim 6, characterized in that: The bottom of the filtering tower (15) is provided with a waste residue outlet (18).

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