Automatic disposal system for inner leakage of sulfuric acid heat exchanger in chlorine drying process

Abstract

The utility model discloses a kind of automatic disposal systems of sulfuric acid heat exchanger inner leakage in chlorine drying process, it includes heat exchanger sulfuric acid import pressure transmitter;Heat exchanger sulfuric acid import pressure transmitter is installed on heat exchanger sulfuric acid import pipeline, heat exchanger circulating water import pipeline is installed with heat exchanger circulating water import pressure transmitter and heat exchanger circulating water import pressure regulating valve;Heat exchanger circulating water import pressure transmitter is electrically connected with the input end of controller, and the output end of controller is electrically connected with heat exchanger circulating water import pressure regulating valve.Advantage: according to the heat exchanger sulfuric acid import pressure monitored by heat exchanger sulfuric acid import pressure transmitter, set heat exchanger circulating water import pressure, require heat exchanger circulating water import pressure lower than heat exchanger sulfuric acid import pressure, reduce the risk that circulating water enters acid system, when heat exchanger inner leakage occurs, circulating acid can enter circulating water, circulating water cannot enter circulating acid, avoid to cause corrosion to equipment.

Description

Technical fields:

[0001] This utility model relates to the technical field of chlorine drying equipment, and in particular to an automatic handling system for internal leakage of sulfuric acid heat exchanger during chlorine drying process. Background technology:

[0002] In industrial production, chlorine gas is typically dried using sulfuric acid supplied from an acid system. During the drying process, the sulfuric acid temperature rises, which is then cooled using a shell-and-tube heat exchanger. The circulating sulfuric acid exchanges heat with the circulating water in the water system within the heat exchanger. If the heat exchanger leaks internally, either circulating water or circulating acid can enter the acid system or the water system. If circulating water enters the acid washing tower in the acid system, the small volume of circulating acid will create a large amount of dilute sulfuric acid, causing severe corrosion to downstream equipment. If circulating acid enters the water system, the large volume of circulating water will cause a short-term decrease in pH, but will not cause severe corrosion to equipment.

[0003] Existing technologies utilize online pH monitoring on the circulating water return pipe to promptly detect internal leaks in the heat exchanger, allowing circulating acid to enter the circulating water. Temperature monitoring on the circulating acid pipe also detects leaks where circulating water enters the acid system, based on the principle that the circulating acid temperature rises upon entering the system. Furthermore, using corrosion-resistant heat exchangers reduces the risk of internal leaks; however, these materials are expensive. The disadvantages of existing technologies are: when an internal leak occurs, the initial entry of circulating acid into the circulating water doesn't cause a significant temperature rise in the acid, sometimes making timely detection difficult; during operation, there is no significant difference between circulating water and circulating acid pressures, meaning either water or acid can enter the water after an internal leak; and the level of automation is low, resulting in long response times after an internal leak occurs. Utility Model Content:

[0004] The purpose of this invention is to provide an automatic system for handling internal leaks in sulfuric acid heat exchangers during the chlorine drying process, which can detect and address internal leaks in heat exchangers in a timely manner.

[0005] This utility model is implemented by the following technical solution: an automatic handling system for internal leakage in a sulfuric acid heat exchanger during chlorine drying, comprising a sulfuric acid circulating pump inlet pipe, a sulfuric acid circulating pump, a heat exchanger sulfuric acid inlet pipe, a heat exchanger, a heat exchanger sulfuric acid outlet pipe, a heat exchanger circulating water inlet pipe, and a heat exchanger circulating water outlet pipe; the inlet of the sulfuric acid circulating pump is connected to the sulfuric acid circulating pump inlet pipe, the outlet of the sulfuric acid circulating pump is connected to the sulfuric acid inlet of the heat exchanger through the heat exchanger sulfuric acid inlet pipe, and the sulfuric acid outlet of the heat exchanger is connected to the heat exchanger sulfuric acid outlet pipe; the circulation of the heat exchanger... The water inlet is connected to the circulating water inlet pipe of the heat exchanger, and the circulating water outlet of the heat exchanger is connected to the circulating water outlet pipe of the heat exchanger; a sulfuric acid inlet pressure transmitter is installed on the sulfuric acid inlet pipe of the heat exchanger, and a circulating water inlet pressure transmitter and a circulating water inlet pressure regulating valve are installed on the circulating water inlet pipe of the heat exchanger; the set value of the circulating water inlet pressure of the heat exchanger is lower than the sulfuric acid inlet pressure of the heat exchanger; the circulating water inlet pressure transmitter is electrically connected to the input terminal of the controller, and the output terminal of the controller is electrically connected to the circulating water inlet pressure regulating valve.

[0006] Furthermore, a heat exchanger circulating water inlet shut-off valve is installed on the heat exchanger circulating water inlet pipe.

[0007] Furthermore, a sulfuric acid outlet temperature transmitter and a sulfuric acid outlet concentration detector are installed on the sulfuric acid outlet pipe of the heat exchanger.

[0008] Furthermore, a heat exchanger circulating water outlet pH value monitor and a heat exchanger circulating water outlet shut-off valve are installed on the heat exchanger circulating water outlet pipe.

[0009] The advantages of this invention are as follows: Based on the circulating acid inlet pressure monitored by the sulfuric acid inlet pressure transmitter of the heat exchanger, the circulating water inlet pressure of the heat exchanger is set. The set value of the circulating water inlet pressure of the heat exchanger is required to be lower than the sulfuric acid inlet pressure of the heat exchanger, which reduces the risk of circulating water entering the acid system. When internal leakage of the heat exchanger occurs, the circulating acid will enter the circulating water, but the circulating water cannot enter the circulating acid, thus avoiding corrosion of the equipment.

[0010] When an internal leak occurs in the heat exchanger, circulating water enters the circulating acid, causing the temperature of the circulating acid to rise and its concentration to decrease after heat exchange. When the circulating acid concentration drops to the set value, the sulfuric acid outlet concentration detector of the heat exchanger will send a signal back to the controller. Alternatively, when the circulating acid temperature rises to the set value, the sulfuric acid outlet temperature transmitter of the heat exchanger will send a signal back to the controller. If either of these situations occurs, it is determined that an internal leak has occurred in the heat exchanger. The controller will then stop the sulfuric acid circulating pump and simultaneously close the circulating water inlet shut-off valve and the circulating water outlet shut-off valve of the heat exchanger, thus enabling timely detection and shutdown of the internal leak.

[0011] When circulating acid enters the circulating water, the pH value of the circulating water decreases. When the pH value of the circulating water drops to the set value, the pH value monitor at the outlet of the heat exchanger will send a signal back to the controller, which will determine that there is an internal leak in the heat exchanger. The controller will then control the sulfuric acid circulating pump to stop and close the inlet and outlet shut-off valves of the heat exchanger circulating water, thus enabling timely detection, timely shutdown, and timely handling. Attached image description:

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the control structure of this utility model.

[0014] The components in the attached diagram are labeled as follows: 1. Sulfuric acid circulating pump inlet pipe; 2. Sulfuric acid circulating pump; 3. Heat exchanger sulfuric acid inlet pipe; 4. Heat exchanger sulfuric acid outlet pipe; 5. Heat exchanger circulating water inlet pipe; 6. Heat exchanger circulating water outlet pipe; 7. Heat exchanger sulfuric acid inlet pressure transmitter; 8. Heat exchanger sulfuric acid outlet temperature transmitter; 9. Heat exchanger sulfuric acid outlet concentration detector; 10. Heat exchanger circulating water inlet pressure transmitter; 11. Heat exchanger circulating water outlet pH monitor; 12. Heat exchanger circulating water inlet pressure regulating valve; 13. Heat exchanger circulating water inlet shut-off valve; 14. Heat exchanger circulating water outlet shut-off valve; 15. Controller; 16. Detailed implementation method:

[0015] 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.

[0016] like Figure 1 and Figure 2As shown, this embodiment provides an automatic system for handling internal leakage in a sulfuric acid heat exchanger during chlorine drying. It includes a sulfuric acid circulating pump inlet pipe 1, a sulfuric acid circulating pump 2, a heat exchanger sulfuric acid inlet pipe 3, a heat exchanger 4, a heat exchanger sulfuric acid outlet pipe 5, a heat exchanger circulating water inlet pipe 6, and a heat exchanger circulating water outlet pipe 7. The inlet of the sulfuric acid circulating pump 2 is connected to the sulfuric acid circulating pump inlet pipe 1, and the outlet of the sulfuric acid circulating pump 2 is connected to the sulfuric acid inlet of the heat exchanger 4 via the heat exchanger sulfuric acid inlet pipe 3. The sulfuric acid outlet of the heat exchanger 4 is connected to the heat exchanger sulfuric acid outlet pipe 5. The circulating water inlet of the heat exchanger 4 is connected to the heat exchanger circulating water inlet pipe 6, and the circulating water outlet of the heat exchanger 4 is connected to the heat exchanger circulating water outlet pipe 7. A heat exchanger sulfuric acid inlet pressure transmitter 8 is installed on the heat exchanger sulfuric acid inlet pipe 3 to monitor the pressure of the circulating acid. A heat exchanger circulating water inlet pressure transmitter 11 and a heat exchanger circulating water inlet pressure regulating valve 13 are installed on pipe 6. The heat exchanger circulating water inlet pressure transmitter 11 is used to monitor the inlet pressure of the circulating water, and the heat exchanger circulating water inlet pressure regulating valve 13 is used to regulate the inlet pressure of the circulating water. The heat exchanger circulating water inlet pressure transmitter 11 is electrically connected to the input terminal of the controller 16, and the output terminal of the controller 16 is electrically connected to the heat exchanger circulating water inlet pressure regulating valve 13. A heat exchanger circulating water inlet shut-off valve 14 is installed on the heat exchanger circulating water inlet pipe 6 to shut off the circulating water inlet, and a heat exchanger circulating water outlet shut-off valve 15 is installed on the heat exchanger circulating water outlet pipe 7 to shut off the circulating water outlet. The output terminal of the controller 16 is electrically connected to the heat exchanger circulating water inlet shut-off valve 14, the heat exchanger circulating water outlet shut-off valve 15, and the sulfuric acid circulating pump 2.

[0017] Sulfuric acid in the pickling tower enters the sulfuric acid circulating pump 2 through the sulfuric acid circulating pump inlet pipe 1, and then enters the heat exchanger 4 through the heat exchanger sulfuric acid inlet pipe 3. In the heat exchanger 4, the sulfuric acid and circulating water indirectly exchange heat. After heat exchange, the sulfuric acid returns to the pickling tower through the heat exchanger sulfuric acid outlet pipe 5 to spray and dry chlorine gas. Based on the sulfuric acid inlet pressure of the heat exchanger monitored by the heat exchanger sulfuric acid inlet pressure transmitter 8, the heat exchanger circulating water inlet pressure is set. It is required that the set value of the heat exchanger circulating water inlet pressure is lower than the heat exchanger sulfuric acid inlet pressure. The circulating water inlet pressure is basically kept at the set value by the heat exchanger circulating water inlet pressure transmitter 11, heat exchanger circulating water inlet pressure regulating valve 13, and controller 16. When internal leakage occurs in the heat exchanger 4, the risk of circulating water entering the acid system can be reduced, avoiding corrosion of the equipment.

[0018] A sulfuric acid outlet temperature transmitter 9 and a sulfuric acid outlet concentration detector 10 are installed on the sulfuric acid outlet pipe 5 of the heat exchanger, and are electrically connected to the input terminal of the controller 16. The sulfuric acid outlet temperature transmitter 9 is used to monitor the temperature of the circulating acid, and the sulfuric acid outlet concentration detector 10 is used to monitor the concentration of the circulating acid after heat exchange. When the heat exchanger 4 has an internal leak, circulating water enters the circulating acid, and the temperature of the circulating acid after heat exchange rises and the concentration decreases. When the circulating acid concentration drops to the set value, the sulfuric acid outlet concentration detector 10 feeds back the signal to the controller 16, or when the circulating acid temperature rises to the set value, the sulfuric acid outlet temperature transmitter 9 feeds back the signal to the controller 16. When the above situations occur, it is determined that the heat exchanger 4 has an internal leak. The controller 16 controls the sulfuric acid circulating pump 2 to stop, and at the same time controls the heat exchanger circulating water inlet shut-off valve 14 and the heat exchanger circulating water outlet shut-off valve 15 to close, so as to realize timely detection of internal leaks and timely shutdown.

[0019] A pH monitor 12 for the circulating water outlet of the heat exchanger is installed on the circulating water outlet pipe 7 and is electrically connected to the input terminal of the controller 16. The pH monitor 12 is used to monitor the pH value of the circulating water outlet. When the heat exchanger 4 has an internal leak, circulating acid enters the circulating water, and the pH value of the circulating water drops. When the pH value of the circulating water drops to the set value, the pH monitor 12 sends a signal back to the controller 16, which determines that the heat exchanger 4 has an internal leak. The controller 16 controls the sulfuric acid circulating pump 2 to stop and controls the heat exchanger circulating water inlet shut-off valve 14 and the heat exchanger circulating water outlet shut-off valve 15 to close, so as to realize timely detection, timely shutdown and timely handling.

[0020] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic system for handling internal leaks in a sulfuric acid heat exchanger during chlorine drying, characterized in that, It includes the sulfuric acid circulating pump inlet pipe, sulfuric acid circulating pump, sulfuric acid inlet pipe of heat exchanger, heat exchanger, sulfuric acid outlet pipe of heat exchanger, circulating water inlet pipe of heat exchanger, and circulating water outlet pipe of heat exchanger. The inlet of the sulfuric acid circulating pump is connected to the sulfuric acid circulating pump inlet pipe, the outlet of the sulfuric acid circulating pump is connected to the sulfuric acid inlet of the heat exchanger through the sulfuric acid inlet pipe of the heat exchanger, and the sulfuric acid outlet of the heat exchanger is connected to the sulfuric acid outlet pipe of the heat exchanger. The circulating water inlet of the heat exchanger is connected to the circulating water inlet pipe of the heat exchanger, and the circulating water outlet of the heat exchanger is connected to the circulating water outlet pipe of the heat exchanger. A sulfuric acid inlet pressure transmitter is installed on the sulfuric acid inlet pipe of the heat exchanger, and a circulating water inlet pressure transmitter and a circulating water inlet pressure regulating valve are installed on the circulating water inlet pipe of the heat exchanger. The set value of the circulating water inlet pressure is lower than the sulfuric acid inlet pressure. The circulating water inlet pressure transmitter is electrically connected to the input terminal of the controller, and the output terminal of the controller is electrically connected to the circulating water inlet pressure regulating valve.

2. The automatic leakage handling system for sulfuric acid heat exchanger during chlorine drying process according to claim 1, characterized in that, A heat exchanger circulating water inlet shut-off valve is installed on the heat exchanger circulating water inlet pipe.

3. An automatic leak handling system for sulfuric acid heat exchangers during chlorine drying, as described in claim 1 or 2, is characterized in that... The sulfuric acid outlet pipe of the heat exchanger is equipped with a sulfuric acid outlet temperature transmitter and a sulfuric acid outlet concentration detector.

4. The automatic leakage handling system for sulfuric acid heat exchanger during chlorine drying process according to claim 3, characterized in that, The heat exchanger circulating water outlet pipe is equipped with a heat exchanger circulating water outlet pH value monitor and a heat exchanger circulating water outlet shut-off valve.

Images