Sodium hypochlorite production system

Abstract

The utility model provides a sodium hypochlorite production system, and relates to the technical field of waste chlorine treatment, the sodium hypochlorite production system comprises a waste chlorine conveying pipeline, a fresh alkali liquor conveying pipeline, a multi-stage absorption circulation unit, a refining tank and a finished product tank, the waste chlorine conveying pipeline and the fresh alkali liquor conveying pipeline are respectively connected with the multi-stage absorption circulation unit and the refining tank, a first discharge port and a second discharge port are formed in the bottom end of the multi-stage absorption circulating unit, are respectively connected with the refining tank and the finished product tank through discharge pipelines, and are respectively provided with a discharge quick switching valve; according to the device, the continuity and the stability of the production process can be ensured by adopting the multi-stage absorption circulation unit, the effective utilization of waste chlorine and the preparation of sodium hypochlorite are realized, and the manual analysis frequency is reduced by arranging the alkali amount on-line analyzer.

Description

Technical Field

[0001] This application relates to the field of waste chlorine treatment, and more specifically, to a sodium hypochlorite production system. Background Technology

[0002] Waste chlorine gas is generated during the start-up and shutdown process of caustic soda electrolysis, the start-up and shutdown replacement process of hydrochloric acid and hydrogen chloride synthesis, and the packaging of liquid chlorine. In the existing technology, waste chlorine gas is treated and utilized by producing sodium hypochlorite products using waste chlorine gas.

[0003] Currently, the system for producing sodium hypochlorite using waste chlorine gas includes a waste chlorine gas absorption section, an alkaline solution circulation section, and a sodium hypochlorite preparation section. Because the production process involves multiple processing and circulation links, many valves need to be switched, making operation inconvenient. At the same time, frequent sampling and analysis are required to check the reaction degree. Furthermore, during start-up and shutdown, the sodium hypochlorite preparation section often needs to receive a large amount of waste chlorine gas, which can easily lead to the overflow of waste chlorine gas from the production system, causing environmental pollution and safety accidents.

[0004] In view of this, this application aims to provide a sodium hypochlorite production system to better solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this application is to provide a sodium hypochlorite production system that can solve the technical problems of existing waste chlorine gas production systems being inconvenient to operate and posing a risk of waste chlorine gas overflow.

[0006] This application provides a sodium hypochlorite production system, including a waste chlorine gas conveying pipeline, a fresh alkali solution conveying pipeline, a multi-stage absorption and circulation unit, a refining tank, and a finished product tank. The waste chlorine gas conveying pipeline and the fresh alkali solution conveying pipeline are respectively connected to the multi-stage absorption and circulation unit and the refining tank. The multi-stage absorption and circulation unit has a first discharge port and a second discharge port at its bottom end. The first discharge port and the second discharge port are respectively connected to the refining tank and the finished product tank through discharge pipelines, and the first discharge port and the second discharge port are respectively equipped with a quick-cut discharge valve. The refining tank is connected to an online alkali content analyzer.

[0007] Furthermore, the waste chlorine gas transmission pipeline is equipped with an emergency chlorine flow meter, an emergency chlorine regulating valve, and an emergency chlorine quick-cut valve.

[0008] Furthermore, a recovery pump is installed on the waste chlorine gas transmission pipeline, and a check valve is installed at the outlet of the recovery pump.

[0009] Furthermore, the multi-stage absorption and circulation unit is configured as three stages, each stage being equipped with an absorption tower, a circulation tank, and a cooler. The bottom of the absorption tower is provided with a chlorine inlet and an alkaline solution outlet, and the top of the absorption tower is provided with a chlorine outlet and an alkaline solution inlet. The alkaline solution outlet is connected to the circulation tank. The first discharge port and the second discharge port are located at the bottom of the circulation tank, and the cooler is connected to the circulation tank and the alkaline solution inlet, respectively.

[0010] Furthermore, the circulation tank is connected to the alkali inlet of the absorption tower via a bypass pipeline.

[0011] Furthermore, the cooler is configured as a water-cooled plate heat exchanger, and a water flow regulating valve is provided at its cold water inlet.

[0012] Furthermore, the refining tank is equipped with a magnetic level gauge.

[0013] Furthermore, the refining tank is equipped with a pure water replenishment pipeline.

[0014] Furthermore, at least one set of the refining tanks is provided.

[0015] The beneficial effects of this utility model are:

[0016] The sodium hypochlorite production system provided by this utility model includes a waste chlorine gas conveying pipeline, a fresh alkali solution conveying pipeline, a multi-stage absorption and circulation unit, a refining tank, and a finished product tank. The waste chlorine gas conveying pipeline and the fresh alkali solution conveying pipeline are respectively connected to the multi-stage absorption and circulation unit and the refining tank. The bottom of the multi-stage absorption and circulation unit is provided with a first discharge port and a second discharge port. The first discharge port and the second discharge port are respectively connected to the refining tank and the finished product tank through discharge pipelines, and the first discharge port and the second discharge port are respectively equipped with discharge quick-cut valves. The refining tank is connected to an online alkali content analyzer. This utility model has a simple structure and reasonable design. By adopting a multi-stage absorption and circulation unit, the continuity and stability of the production process can be ensured, the effective utilization of waste chlorine gas and the preparation of sodium hypochlorite can be realized, and the frequency of manual analysis can be reduced by setting up an online alkali content analyzer. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 These are schematic diagrams of the structure in some embodiments of this utility model;

[0019] Figure 2 This is a schematic diagram showing the connection of a set of refining tanks in some embodiments of this utility model.

[0020] The reference numerals in the attached figures are as follows:

[0021] 1. Waste chlorine gas conveying pipeline; 2. Fresh alkali solution conveying pipeline; 3. Multi-stage absorption and circulation unit; 3. Absorption tower; 31. Circulation tank; 32. Cooler; 33. Bypass pipeline; 34. Refining tank; 4. Pure water replenishment pipeline; 41. Finished product tank; 5. First discharge port; 6. Second discharge port; 7. Discharge pipeline; 8. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] See Figures 1-2 As shown, the sodium hypochlorite production system described in this embodiment includes a waste chlorine gas conveying pipeline 1, a fresh alkali solution conveying pipeline 2, a multi-stage absorption and circulation unit 3, a refining tank 4, and a finished product tank 5. The waste chlorine gas conveying pipeline 1 and the fresh alkali solution conveying pipeline 2 are respectively connected to the multi-stage absorption and circulation unit 3 and the refining tank 4. The bottom end of the multi-stage absorption and circulation unit 3 is provided with a first discharge port 6 and a second discharge port 7. The first discharge port 6 and the second discharge port 7 are respectively connected to the refining tank 4 and the finished product tank 5 through discharge pipelines 8. The first discharge port 6 and the second discharge port 7 are respectively equipped with discharge quick-cut valves. The refining tank 4 is connected to an online alkali content analyzer.

[0029] This embodiment has a simple structure and reasonable design. By adopting a multi-stage absorption and circulation unit 3, the continuity and stability of the production process can be ensured, the effective utilization of waste chlorine gas and the preparation of sodium hypochlorite can be realized, and the frequency of manual analysis can be reduced by setting up an online alkali analyzer.

[0030] Specifically, in this embodiment, the first discharge port 6 and the second discharge port 7 are used to discharge qualified sodium hypochlorite and unqualified sodium hypochlorite, respectively. The qualified sodium hypochlorite is directly transported to the finished product tank 5, while the unqualified sodium hypochlorite is transported to the refining tank 4. After refining, qualified sodium hypochlorite products are produced.

[0031] In this embodiment, the preparation and production principle is a conventional and mature principle in the prior art, and this embodiment only improves the device part.

[0032] In some embodiments, the waste chlorine gas transmission pipeline 1 is equipped with an emergency chlorine flow meter, an emergency chlorine regulating valve, and an emergency chlorine quick-cut valve.

[0033] In this embodiment, by installing an emergency chlorine flow meter, an emergency chlorine regulating valve, and an emergency chlorine quick-cut valve (not shown in the attached diagram) on the waste chlorine gas transmission pipeline 1, the safety of the system is improved. In an emergency, the flow rate of waste chlorine gas can be controlled to prevent accidents and protect the environment and personnel safety.

[0034] In some embodiments, a recovery pump is installed on the waste chlorine gas transmission pipeline 1, and a check valve is installed at the outlet of the recovery pump.

[0035] In this embodiment, by installing a recovery pump and a check valve (not shown in the attached figure) on the waste chlorine gas delivery pipeline 1, the stable delivery of waste chlorine gas is ensured. The recovery pump provides power so that the waste chlorine gas can smoothly enter the multi-stage absorption and circulation unit 3, while the check valve prevents the backflow of waste chlorine gas, ensuring the unidirectional flow and stability of the system.

[0036] In some embodiments, the multi-stage absorption and circulation unit 3 is configured as three stages, each stage being an absorption tower 31, a circulation tank 32, and a cooler 33. The bottom end of the absorption tower 31 is provided with a chlorine inlet and an alkaline solution outlet, and the top end of the absorption tower 31 is provided with a chlorine outlet and an alkaline solution inlet. The alkaline solution outlet is connected to the circulation tank 32. The first discharge port 6 and the second discharge port 7 are located at the bottom end of the circulation tank 32. The cooler 33 is connected to the circulation tank 32 and the alkaline solution inlet, respectively.

[0037] Specifically, the circulation tank 32 is connected to the alkali inlet of the absorption tower 31 via a bypass pipe 34.

[0038] In this embodiment, multi-stage absorption can more effectively utilize waste chlorine gas and alkaline solution, thereby improving reaction efficiency. The configuration of circulation tank 32 and cooler 33 ensures the stability and controllability of the reaction process. In addition, circulation tank 32 is connected to the alkaline solution inlet of absorption tower 31 through bypass pipe 34. When needed, the flow rate and temperature of alkaline solution can be adjusted through bypass pipe 34 to meet the needs of different production conditions.

[0039] In some embodiments, the cooler 33 is configured as a water-cooled plate heat exchanger, and a water flow regulating valve is provided at its cold water inlet.

[0040] In this embodiment, the cooler 33 is configured as a water-cooled plate heat exchanger, and a water flow regulating valve is provided at its cold water inlet, which improves the cooling effect and energy-saving performance of the system. The water flow regulating valve can adjust the flow rate of cooling water according to actual needs to achieve energy saving and consumption reduction.

[0041] In some embodiments, the refining tank 4 is equipped with a magnetic level gauge.

[0042] In this embodiment, by equipping the refining tank 4 with a magnetic float level gauge, operators can conveniently monitor the liquid level in the refining tank 4 in real time. At the same time, the magnetic float level gauge has the advantages of intuitive readings, accuracy and reliability, providing a strong guarantee for the safe operation of the system.

[0043] In some embodiments, the refining tank 4 is provided with a pure water replenishment pipeline 41.

[0044] In this embodiment, a pure water replenishment pipeline 41 is provided to facilitate the replenishment of pure water based on the reaction process.

[0045] In some embodiments, the refining tank 4 is provided with at least one set.

[0046] In this embodiment, at least one set of refining tanks 4 is provided, which improves the production capacity and flexibility of the system. When a set of refining tanks 4 encounters problems or needs maintenance during the production process, it can be switched to another set of refining tanks 4 to continue production, ensuring the continuity and stability of production.

[0047] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A sodium hypochlorite production system, characterized in that: The system includes a waste chlorine gas conveying pipeline, a fresh alkali solution conveying pipeline, a multi-stage absorption and circulation unit, a refining tank, and a finished product tank. The waste chlorine gas conveying pipeline and the fresh alkali solution conveying pipeline are respectively connected to the multi-stage absorption and circulation unit and the refining tank. The multi-stage absorption and circulation unit has a first discharge port and a second discharge port at its bottom. The first discharge port and the second discharge port are respectively connected to the refining tank and the finished product tank through discharge pipelines. The first discharge port and the second discharge port are respectively equipped with quick-cut discharge valves. The refining tank is connected to an online alkali content analyzer.

2. The sodium hypochlorite production system according to claim 1, characterized in that: The waste chlorine gas transmission pipeline is equipped with an emergency chlorine flow meter, an emergency chlorine regulating valve, and an emergency chlorine quick-cut valve.

3. The sodium hypochlorite production system according to claim 1, characterized in that: A recovery pump is installed on the waste chlorine gas transmission pipeline, and a check valve is installed at the outlet of the recovery pump.

4. The sodium hypochlorite production system according to claim 1, characterized in that: The multi-stage absorption and circulation unit is configured as three stages, each stage having an absorption tower, a circulation tank, and a cooler. The bottom of the absorption tower has a chlorine inlet and an alkaline outlet, and the top of the absorption tower has a chlorine outlet and an alkaline inlet. The alkaline outlet is connected to the circulation tank. The first discharge port and the second discharge port are located at the bottom of the circulation tank. The cooler is connected to the circulation tank and the alkaline inlet, respectively.

5. The sodium hypochlorite production system according to claim 4, characterized in that: The circulation tank is connected to the alkali inlet of the absorption tower via a bypass pipeline.

6. The sodium hypochlorite production system according to claim 4, characterized in that: The cooler is a water-cooled plate heat exchanger, and a water flow regulating valve is provided at its cold water inlet.

7. The sodium hypochlorite production system according to claim 1, characterized in that: The refining tank is equipped with a magnetic level gauge.

8. The sodium hypochlorite production system according to claim 1, characterized in that: The refining tank is equipped with a pure water replenishment pipeline.

9. The sodium hypochlorite production system according to claim 1, characterized in that: The refining tank is provided in at least one set.

Images