Multi-stage water seal and absorption function device for hydrochloric acid storage tank

Abstract

The utility model discloses a hydrochloric acid storage tank multistage water seal and absorption function device, which comprises a circulating pump body, a liquid seal groove, a tail gas emptying and filler pressing plate, one side of the circulating pump body is respectively connected with an absorption liquid outlet pipe and a circulating pipe through pipelines, one side of the circulating pipe is provided with a spray head through a pipeline, and the spray head is connected with the tail gas emptying and filler pressing plate through a pipeline. A filler is arranged at the bottom of the filler pressing plate, a filler support is arranged at the lower end of the filler, and an overflow weir is arranged at the lower end of the filler support. According to the technical scheme, volatilization of hydrochloric acid gas hydrogen chloride is reduced through the multi-stage water seal design, concentration gradient is formed by absorption liquid, standard emission of tail gas is achieved through the absorption function, and compared with a traditional tail gas tower, the device with the multi-stage water seal and the absorption function has the advantages that volatilization of hydrochloric acid tail gas is little, occupied space is small, and cost is low. The method has the advantages of simple operation, low equipment and investment, low operation cost and energy consumption, simplicity in maintenance, static state of tail gas in the storage tank in the storage process and the like.

Description

Technical Field

[0001] This utility model relates to the field of hydrochloric acid and ammonia production technology, specifically to a multi-stage water seal and absorption device for a hydrochloric acid storage tank. Background Technology

[0002] Hydrochloric acid is a strong inorganic acid widely used in the chemical industry. Its main sources are: 1) synthesis from hydrogen and chlorine; and 2) production through chemical reactions such as chlorination and acylation, which are generally byproducts. At high concentrations, hydrochloric acid is highly volatile. The evaporating hydrogen chloride combines with water vapor in the air to form small droplets of hydrochloric acid, creating acid mist. This not only pollutes the surrounding environment but also has a strong corrosive effect on equipment, steel platforms, instruments, and pipelines. However, in existing hydrochloric acid storage processes, the absorption pump continuously circulates the gas, creating negative pressure that causes hydrogen chloride to continuously evaporate from the storage tank. This dynamic release of hydrogen chloride tail gas results in high energy consumption, the use of large amounts of alkaline solution, and the high salt content in the absorption liquid, making it difficult to treat. Utility Model Content

[0003] The purpose of this invention is to provide a multi-stage water seal and absorption device for hydrochloric acid storage tanks, which has the advantage of low hydrochloric acid tail gas volatilization.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage water seal and absorption device for a hydrochloric acid storage tank, comprising a circulating pump body, a liquid seal tank, a tail gas vent, and a packing pressure plate. One side of the circulating pump body is connected to an absorbent outlet pipe and a circulating pipe via pipelines. One side of the circulating pipe is equipped with a spray head via a pipeline. Packing material is provided at the bottom of the packing pressure plate, and a packing support is provided at the lower end of the packing material. An overflow weir is provided at the lower end of the packing support, and a liquid seal baffle is provided at the upper end of the overflow weir. A liquid seal baffle is provided at the upper end of the liquid seal baffle. The system includes a collection plate. A circulation pump inlet pipe is connected to the other side of the circulation pump body via a pipeline. A lower level gauge interface is located on one side of the circulation pump inlet pipe. An upper level gauge interface is located above the lower level gauge interface. A refrigerant inlet is located on one side of the lower level gauge interface. A cooler is located above the refrigerant inlet. A breather valve interface, a tail gas inlet, and a liquid alkali inlet are connected to the upper end of the upper level gauge interface via pipelines. A refrigerant outlet and a circulation tank are located on the right side of the upper level gauge interface. A pH meter interface is located on one side of the liquid seal tank.

[0005] As a preferred embodiment, the air flow rate of the liquid seal tank and the packing is the maximum liquid inlet flow rate, which is 1.5 times the rated flow rate of the unloading pump.

[0006] As a preferred embodiment, the gas flow rate of the liquid seal tank and the packing is one meter per second.

[0007] As a preferred embodiment, the number of spray heads is four, with one each at one-quarter and three-quarters of the diameter, arranged in a cross shape.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] This utility model, through the above-mentioned technical solution, reduces the volatilization of hydrochloric acid gas and hydrogen chloride by using a multi-stage water seal design and forming a concentration gradient in the absorption liquid. Through the absorption function, the exhaust gas achieves the standard emission. Compared with traditional exhaust gas towers, the multi-stage water seal and absorption device has the advantages of less hydrochloric acid exhaust gas volatilization, smaller footprint, less equipment and investment, lower operating costs and energy consumption, simpler maintenance, and the exhaust gas in the storage tank remains static during storage. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] In the diagram: 1. Breathing valve interface; 2. Exhaust gas inlet; 3. Liquid alkali inlet; 4. Refrigerant outlet; 5. Refrigerant inlet; 6. Circulation tank; 7. Liquid seal tank; 8. Overflow weir; 9. Liquid seal baffle; 10. Liquid collection plate; 11. Packing support; 12. Packing pressure plate; 13. Spray head; 14. Exhaust gas vent; 15. Circulation pipe; 16. Circulation pump body; 17. Circulation pump inlet pipe; 18. Absorbent liquid outlet pipe; 19. Lower interface of level gauge; 20. Upper interface of level gauge; 21. pH meter interface; 22. Packing; 23. Cooler. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. Example

[0014] Please see Figure 1As shown, this utility model provides a multi-stage water seal and absorption device for a hydrochloric acid storage tank, including a circulating pump body 16, a liquid seal tank 7, a tail gas vent 14, and a packing pressure plate 12. One side of the circulating pump body 16 is connected to an absorbent outlet pipe 18 and a circulating pipe 15 via pipelines. A spray head 13 is installed on one side of the circulating pipe 15 via a pipeline. Packing material 22 is installed at the bottom of the packing pressure plate 12, and a packing support 11 is installed at the lower end of the packing material 22. An overflow weir 8 is installed at the lower end of the packing support 11, and a liquid seal baffle 9 is installed at the upper end of the overflow weir 8. A liquid collection plate 1 is installed at the upper end of the liquid seal baffle 9. 0. The other side of the circulating pump body 16 is connected to the circulating pump inlet pipe 17 via a pipeline. A liquid level gauge lower interface 19 is provided on one side of the circulating pump inlet pipe 17. A liquid level gauge upper interface 20 is provided at the upper end of the liquid level gauge lower interface 19. A refrigerant inlet 5 is provided on one side of the liquid level gauge lower interface 19. A cooler 23 is provided at the upper end of the refrigerant inlet 5. A breather valve interface 1, a tail gas inlet 2, and a liquid alkali inlet 3 are respectively connected to the upper end of the liquid level gauge upper interface 20 via pipelines. A refrigerant outlet 4 and a circulating tank 6 are respectively provided on the right side of the liquid level gauge upper interface 20. A pH meter interface 21 is provided on one side of the liquid seal tank 7.

[0015] This technical solution, through the above-mentioned technical approach, reduces the volatilization of hydrochloric acid gas and hydrogen chloride by using a multi-stage water seal design and creates a concentration gradient in the absorption liquid. Through the absorption function, the exhaust gas achieves the standard emission. Compared with traditional exhaust gas towers, the multi-stage water seal and absorption device has advantages such as less hydrochloric acid exhaust gas volatilization, smaller footprint, less equipment and investment, lower operating costs and energy consumption, simpler maintenance, and the exhaust gas in the storage tank remains static during storage. Example

[0016] Based on Embodiment 1, this utility model is as follows: Figure 1 As shown, the air flow rate of the liquid seal tank 7 and the packing 22 is the maximum liquid inlet flow rate, which is 1.5 times the rated flow rate of the unloading pump. The gas flow rate of the liquid seal tank 7 and the packing 22 is 1 meter per second. There are four spray heads 13, one at each of the one-quarter and three-quarters diameters, distributed in a cross shape.

[0017] The working principle of this utility model is as follows: Open the alkali feed valve, increase the liquid level to 100mm, then open the water inlet valve and add tap water to 1250mm, preparing an 8% alkali solution for absorption. Then, start the circulation pump body 16 to pump the absorption liquid into the liquid seal tank 7, filling the 4-stage liquid seal tank 7 with absorption liquid. After the liquid seal tank 7 is full, stop the circulation pump body 16, then open the tail gas inlet valve 2 to allow the tail gas to enter the multi-stage water seal and absorption device for liquid sealing of the hydrochloric acid storage tank tail gas. When the hydrochloric acid storage tank is in operation, unloading is performed. First, turn on the circulating pump body 16 to circulate the alkaline absorbent liquid and absorb the exhaust gas expelled from the hydrochloric acid storage tank during unloading. When the tank is unloaded, turn off the circulating pump body 16. When the pH meter detects a value of 8, transfer the absorbent liquid to environmental wastewater treatment or put it into a drum. The multi-stage water seal and absorption function device reabsorbs the liquid. The breather valve interface 1 is kept unobstructed with the pipeline of the storage circulation tank 6 during hydrochloric acid storage. When the hydrochloric acid storage tank is pumped to the workshop and the temperature drops, outside air enters the storage tank through the breather valve inlet.

[0018] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0019] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A multi-stage water seal and absorption device for a hydrochloric acid storage tank, comprising a circulating pump body (16), a liquid seal tank (7), a tail gas vent (14), and a packing pressure plate (12), characterized in that: One side of the circulating pump body (16) is connected to the absorbent outlet pipe (18) and the circulating pipe (15) respectively via pipelines. A spray head (13) is installed on one side of the circulating pipe (15) via a pipeline. The bottom of the packing pressure plate (12) is provided with packing (22). The lower end of the packing (22) is provided with a packing support (11). The lower end of the packing support (11) is provided with an overflow weir (8). The upper end of the overflow weir (8) is provided with a liquid seal baffle (9). The upper end of the liquid seal baffle (9) is provided with a liquid collection plate (10). The other side of the circulating pump body (16) is connected to the circulating pump inlet pipe (17) via a pipeline. A liquid level gauge lower interface (19) is provided on one side of the circulating pump inlet pipe (17). A liquid level gauge upper interface (20) is provided at the upper end of the liquid level gauge lower interface (19). A refrigerant inlet (5) is provided on one side of the liquid level gauge lower interface (19). A cooler (23) is provided at the upper end of the refrigerant inlet (5). A breather valve interface (1), a tail gas inlet (2), and a liquid alkali inlet (3) are respectively connected to the upper end of the liquid level gauge upper interface (20) through pipelines. A refrigerant outlet (4) and a circulating tank (6) are respectively provided on the right side of the liquid level gauge upper interface (20). A pH meter interface (21) is provided on one side of the liquid seal tank (7).

2. The multi-stage water seal and absorption device for a hydrochloric acid storage tank according to claim 1, characterized in that: The air flow rate of the liquid seal tank (7) and the packing (22) is the maximum liquid inlet flow rate, which is 1.5 times the rated flow rate of the unloading pump.

3. The multi-stage water seal and absorption device for a hydrochloric acid storage tank according to claim 1, characterized in that: The gas flow rate of the liquid seal tank (7) and the packing (22) is one meter per second.

4. The multi-stage water seal and absorption device for a hydrochloric acid storage tank according to claim 1, characterized in that: The number of spray heads (13) is four, one at each of the one-quarter and three-quarters of the diameter, arranged in a cross shape.

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