Automatic collection and discharge device for hydrogen chloride condensing acid

Abstract

The utility model discloses a kind of automatic collection, discharge device of hydrogen chloride condensing acid, including condensing acid collection tank and PLC control cabinet, condensing acid collection tank is connected with hydrogen chloride delivery main pipe by condensing acid collection pipe, balance pipe, condensing acid collection pipe is inserted into the bottom of condensing acid collection tank, condensing acid cut-off valve is equipped on condensing acid collection pipe, balance pipe cut-off valve is equipped on balance pipe;Condensing acid collection tank lower portion is equipped with acid discharge pipe, and acid discharge pipe cut-off valve is equipped on acid discharge pipe;Condensing acid cut-off valve, balance pipe cut-off valve, acid discharge pipe cut-off valve are connected with PLC control cabinet respectively.Compared with prior art, the utility model can automatically collect and discharge condensing acid generated in hydrogen chloride delivery process, avoid the condensing acid generated when hydrogen chloride is delivered to be deposited in pipeline;The device operation realizes full-automatic control, avoids the uncertainty of artificial periodic manual acid discharge operation and possible environmental pollution, while reduce the labor intensity of on-site operating personnel.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen chloride synthesis and transportation production technology, and in particular to an automatic collection and discharge device for hydrogen chloride condensate. Background Technology

[0002] The core reaction process in potassium hydroxide production, the electrolysis of potassium chloride brine, produces potassium hydroxide as the main product, along with two byproducts: chlorine and hydrogen. Currently, most chlor-alkali plants process these byproducts (chlorine and hydrogen) and then send them to a hydrogen chloride synthesis furnace for combustion to produce hydrogen chloride. The hydrogen chloride is then absorbed by water to produce hydrochloric acid or sent to downstream processes. Due to the limited market for hydrochloric acid, most of the hydrogen chloride gas is used as a raw material in downstream production facilities.

[0003] When chlorine and hydrogen react in the synthesis furnace, the hydrogen chloride gas produced is saturated with trace amounts of water vapor due to the process requirements of the furnace design and the airtightness of its components. When the hydrogen chloride exits the furnace and is transported to downstream units, these trace amounts of saturated vapor condense and absorb hydrogen chloride as the temperature decreases, forming condensed acid that accumulates in the hydrogen chloride transport pipeline. Over time, this accumulation forms liquid that hinders the transport of hydrogen chloride. If this liquid is not drained in time, it will create significant resistance at the U-shaped section of the pipeline, and in severe cases, it can even cause pipeline vibration, leading to production accidents such as pipeline leaks. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides an automatic collection and discharge device for hydrogen chloride condensate.

[0005] To achieve this technical objective, the present invention adopts the following solution: An automatic collection and discharge device for hydrogen chloride condensed acid includes a condensed acid collection tank and a PLC control cabinet. The condensed acid collection tank is connected to the main hydrogen chloride delivery pipe via a condensed acid collection pipe. The upper end of the condensed acid collection pipe is connected to the bottom of the main hydrogen chloride delivery pipe, and the lower part of the condensed acid collection pipe passes through the top of the condensed acid collection tank and inserts into the bottom of the condensed acid collection tank. A condensed acid shut-off valve is installed on the condensed acid collection pipe. A balance pipe is installed at the top of the condensed acid collection tank and is connected to the main hydrogen chloride delivery pipe. A balance pipe shut-off valve is installed on the balance pipe. An acid discharge pipe is installed at the bottom of the condensed acid collection tank. One end of the acid discharge pipe is connected to the side wall of the condensed acid collection tank, and the other end is connected to the condensed acid storage tank of the synthesis furnace. An acid discharge pipe shut-off valve is installed on the acid discharge pipe. The condensed acid shut-off valve, the balance pipe shut-off valve, and the acid discharge pipe shut-off valve are respectively connected to the PLC control cabinet.

[0006] Furthermore, a manual valve for condensing acid is also installed on the condensing acid collection pipe.

[0007] Furthermore, the upper part of the balance pipe is connected to the top of the hydrogen chloride delivery main pipe, and the lower part of the balance pipe is connected to the top of the condensate collection tank. A manual valve for the balance pipe is also installed on the balance pipe.

[0008] Furthermore, a high-level switch and a low-level switch are installed on the side wall of the condensate collection tank, and the high-level switch and the low-level switch are respectively connected to the PLC control cabinet.

[0009] Furthermore, an electric contact pressure gauge is installed on the top of the condensate collection tank, and the electric contact pressure gauge is connected to the PLC control cabinet.

[0010] Furthermore, a nitrogen pipe is connected to the upper side wall of the condensate collection tank. The nitrogen pipe is equipped with a nitrogen shut-off valve, a nitrogen pressure reducing valve, and a nitrogen manual valve. The nitrogen shut-off valve is connected to the PLC control cabinet.

[0011] Furthermore, the acid drain pipe is also equipped with a one-way valve and a manual valve.

[0012] The condensed acid produced in the hydrogen chloride delivery pipeline flows automatically into the condensed acid collection tank by gravity. Over time, the liquid level in the collection tank gradually rises. When the tank level reaches the height of the high-level switch, the high-level switch sends a closing signal to the PLC control cabinet. The PLC control cabinet then sends a closing signal to close the shut-off valves on the condensed acid collection pipe and the balance pipe, while simultaneously opening the shut-off valve on the acid discharge pipeline. After the feedback signals from the two shut-off valves (closing and opening) and the acid discharge pipeline (opening) are transmitted back to the PLC control cabinet, the PLC control cabinet sends a signal to open the nitrogen shut-off valve to the condensed acid collection tank. Nitrogen gas is added, and as the pressure inside the condensed acid collection tank increases, the condensed acid is forced into the condensed acid storage tank of the synthesis furnace. When the liquid level in the condensed acid tank drops below the low-level switch, the low-level switch sends a disconnect signal to the PLC control cabinet. Upon receiving the disconnect signal from the low-level switch, the PLC control cabinet immediately sends signals to close the shut-off valves on the acid discharge pipeline and the nitrogen shut-off valve on the nitrogen pipeline. After receiving the feedback signals from the two shut-off valves, the PLC control cabinet sends signals to open the shut-off valves on the condensed acid collection pipe and the balance pipe, and the condensed acid collection tank enters the next collection and discharge cycle. To ensure the safety of the device, the PLC control cabinet will forcibly close all shut-off valves if the pressure inside the condensed acid collection tank exceeds the set alarm value of the electric contact pressure gauge at any time.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention enables the automatic collection and discharge of condensed acid generated during hydrogen chloride transportation. It avoids the accumulation of condensed acid in the pipeline, and the device has a compact design and very small footprint. It is installed at the lowest point of different transportation sections according to the hydrogen chloride pipeline route. The device operates with fully automatic control, ensuring safety and reliability. It eliminates the uncertainty and potential environmental pollution caused by manual acid discharge at regular intervals, while also reducing the labor intensity of frontline operators. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the automatic collection and discharge device for hydrogen chloride condensate in an embodiment of this utility model.

[0015] The following are marked in the diagram: 1. Condensed acid collection tank; 2. High-level switch; 3. Low-level switch; 4. Electrical contact pressure gauge; 5. Condensed acid collection pipe; 6. Condensed acid shut-off valve; 7. Condensed acid manual valve; 8. Balance pipe; 9. Balance pipe shut-off valve; 10. Balance pipe manual valve; 11. Acid discharge pipe; 12. Acid discharge pipe shut-off valve; 13. Acid discharge pipe check valve; 14. Acid discharge pipe manual valve; 15. Nitrogen pipe; 16. Nitrogen shut-off valve; 17. Nitrogen pressure reducing valve; 18. Nitrogen manual valve; 19. PLC control cabinet; 20. Hydrogen chloride delivery main pipe. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0017] Please see Figure 1 This utility model provides an automatic collection and discharge device for hydrogen chloride condensate, including a condensate collection tank 1, a high-level switch 2, a low-level switch 3, an electrical contact pressure gauge 4, a condensate collection pipe 5, a condensate shut-off valve 6, a condensate manual valve 7, a balance pipe 8, a balance pipe shut-off valve 9, a balance pipe manual valve 10, an acid discharge pipe 11, an acid discharge pipe shut-off valve 12, an acid discharge pipe check valve 13, an acid discharge pipe manual valve 14, a nitrogen pipe 15, a nitrogen shut-off valve 16, a nitrogen pressure reducing valve 17, a nitrogen manual valve 18, and a PLC control cabinet 19.

[0018] The condensed acid collection tank 1 is connected to the hydrogen chloride delivery main pipe 20 via a condensed acid collection pipe 5. The upper end of the condensed acid collection pipe 5 is connected to the bottom of the hydrogen chloride delivery main pipe 20, and the lower part of the condensed acid collection pipe 5 passes through the top of the condensed acid collection tank 1 and is inserted into the bottom of the condensed acid collection tank 1. A condensed acid shut-off valve 6 and a condensed acid manual valve 7 are installed on the condensed acid collection pipe 5.

[0019] A balance pipe 8 is installed at the top of the condensed acid collection tank 1. The upper part of the balance pipe 8 is connected to the top of the hydrogen chloride delivery main pipe 20, and the lower part of the balance pipe 8 is connected to the top of the condensed acid collection tank 1. A balance pipe shut-off valve 9 and a balance pipe manual valve 10 are installed on the balance pipe 8. By setting up the balance pipe 8, the condensed acid in the hydrogen chloride delivery main pipe 20 can flow smoothly into the condensed acid collection tank 1.

[0020] A high-level switch 2 and a low-level switch 3 are installed on one side wall of the condensed acid collection tank 1 to detect the liquid level inside the condensed acid collection tank 1. An electric contact pressure gauge 4 is installed on the top of the condensed acid collection tank 1.

[0021] A nitrogen pipe 15 is connected to the upper part of the side wall on the other side of the condensed acid collection tank 1. A nitrogen shut-off valve 16, a nitrogen pressure reducing valve 17, and a nitrogen manual valve 18 are installed on the nitrogen pipe 15.

[0022] A discharge pipe 11 is provided at the lower part of the condensed acid collection tank 1. One end of the discharge pipe 11 is connected to the side wall of the condensed acid collection tank 1, and the other end is connected to the condensed acid storage tank of the synthesis furnace. A discharge pipe shut-off valve 12, a discharge pipe check valve 13, and a discharge pipe manual valve 14 are installed on the discharge pipe 11.

[0023] The condensate shut-off valve 6, the balance pipe shut-off valve 9, the high-level material level switch 2, the low-level material level switch 3, the electric contact pressure gauge 4, the nitrogen shut-off valve 16, and the acid discharge pipe shut-off valve 12 are respectively connected to the PLC control cabinet 19. The PLC control cabinet 19 executes the logic control of the relevant valves according to the feedback process signal to realize the automatic collection and discharge of acid.

[0024] The working process of this utility model's automatic collection and discharge device for hydrogen chloride condensate is as follows: First, the condensed acid generated in the hydrogen chloride delivery main pipe 20 flows by gravity through the condensed acid collection pipe 5 into the condensed acid collection tank 1. As time goes by, the liquid level in the condensed acid collection tank 1 gradually rises. When the liquid level in the tank rises to the high level switch 2, the high level switch 2 is triggered to send a closing signal to the PLC control cabinet 19.

[0025] After receiving the closing signal from the high-level material level switch 2, the PLC control cabinet 19 sends a closing signal through the instrument line to automatically close the condensate cut-off valve 6 and the balance pipe cut-off valve 9, while simultaneously opening the acid discharge pipe cut-off valve 12 on the acid discharge pipe 11.

[0026] When the feedback signals of the two shut-off valves, namely the condensate shut-off valve 6 and the balance pipe shut-off valve 9, and the feedback signal of the open valve on the acid discharge pipe shut-off valve 12, are transmitted back to the PLC control cabinet 19, the PLC control cabinet 19 sends a signal to open the nitrogen shut-off valve 16 to add nitrogen into the condensate collection tank 1.

[0027] As nitrogen is added, the pressure inside the condensate collection tank 1 gradually increases. The condensate stored in the condensate collection tank 1 is forced into the condensate storage tank of the synthesis furnace through the acid discharge pipe 11. When the liquid level in the condensate collection tank 1 drops below the low level switch 3, the low level switch 3 sends a disconnect signal to the PLC control cabinet 19. After receiving the disconnect signal from the low level switch 3, the PLC control cabinet 19 sends a signal to close the acid discharge pipe shut-off valve 12 on the acid discharge pipe 11 and the nitrogen shut-off valve 16 on the nitrogen pipeline 15, thus closing the two shut-off valves.

[0028] Upon receiving feedback signals from the closed acid drain pipe shut-off valve 12 and nitrogen shut-off valve 16, PLC control cabinet 19 sends signals to open the condensate shut-off valve 6 and balance pipe shut-off valve 9, allowing the automatic collection and discharge device for hydrogen chloride condensate to enter the next collection and discharge cycle. To ensure device safety, PLC control cabinet 19 will forcibly close all shut-off valves if the pressure inside the condensate collection tank 1 exceeds the set alarm value of the electrical contact pressure gauge 4 at any time.

[0029] 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 it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. If these modifications and variations fall within the scope of the claims of this utility model and their equivalents, they should be considered to be within the protection scope of this utility model.

Claims

1. An automatic collection and discharge device for hydrogen chloride condensate, comprising a condensate collection tank (1) and a PLC control cabinet (19), characterized in that, A condensate collection tank (1) is connected to a hydrogen chloride delivery main pipe (20) via a condensate collection pipe (5). The upper end of the condensate collection pipe (5) is connected to the bottom of the hydrogen chloride delivery main pipe (20), and the lower part of the condensate collection pipe (5) passes through the top of the condensate collection tank (1) and is inserted into the bottom of the condensate collection tank (1). A condensate shut-off valve (6) is installed on the condensate collection pipe (5). A balance pipe (8) is installed on the top of the condensate collection tank (1), and the balance pipe (8) is connected to the hydrogen chloride delivery main pipe (20). The main pipe (20) is connected, and the balance pipe (8) is equipped with a balance pipe shut-off valve (9); the lower part of the condensate collection tank (1) is provided with an acid drain pipe (11), one end of the acid drain pipe (11) is connected to the side wall of the condensate collection tank (1), and the other end is connected to the condensate storage tank of the synthesis furnace. The acid drain pipe (11) is equipped with an acid drain pipe shut-off valve (12); the condensate shut-off valve (6), the balance pipe shut-off valve (9), and the acid drain pipe shut-off valve (12) are respectively connected to the PLC control cabinet (19).

2. The automatic collection and discharge device for hydrogen chloride condensate as described in claim 1, characterized in that, A manual valve (7) for condensing acid is also installed on the condensing acid collection pipe (5).

3. The automatic collection and discharge device for hydrogen chloride condensate as described in claim 1, characterized in that, The upper part of the balance pipe (8) is connected to the top of the hydrogen chloride delivery main pipe (20), and the lower part of the balance pipe (8) is connected to the top of the condensate collection tank (1). A balance pipe manual valve (10) is also installed on the balance pipe (8).

4. The automatic collection and discharge device for hydrogen chloride condensate as described in claim 1, characterized in that, A high-level material level switch (2) and a low-level material level switch (3) are installed on the side wall of the condensed acid collection tank (1). The high-level material level switch (2) and the low-level material level switch (3) are respectively connected to the PLC control cabinet (19).

5. The automatic collection and discharge device for hydrogen chloride condensate as described in claim 1, characterized in that, An electric contact pressure gauge (4) is installed on the top of the condensed acid collection tank (1), and the electric contact pressure gauge (4) is connected to the PLC control cabinet (19).

6. The automatic collection and discharge device for hydrogen chloride condensate as described in claim 1, characterized in that, A nitrogen pipe (15) is connected to the upper side wall of the condensate collection tank (1). A nitrogen shut-off valve (16), a nitrogen pressure reducing valve (17) and a nitrogen manual valve (18) are installed on the nitrogen pipe (15). The nitrogen shut-off valve (16) is connected to the PLC control cabinet (19).

7. The automatic collection and discharge device for hydrogen chloride condensate as described in claim 1, characterized in that, The acid drain pipe (11) is also equipped with an acid drain pipe check valve (13) and an acid drain pipe manual valve (14).

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