A bromine metering loading and exhaust gas recovery system

Abstract

This utility model discloses a bromine quantitative loading and exhaust gas recovery process system, including a bromine storage unit, a bromine quantitative loading unit, a compressed air purging unit, a DCS control unit, and an exhaust gas recovery unit. The bromine storage unit, bromine quantitative loading unit, and exhaust gas recovery unit are connected sequentially. A compressed air purging unit is installed on the loading pipeline of the bromine storage unit. The DCS control unit is interlocked with the bromine storage unit, bromine quantitative loading unit, compressed air purging unit, and exhaust gas recovery unit. The DCS control system achieves high-precision, automated, and accurate quantitative loading of bromine. By setting up an exhaust gas recovery and treatment device, the escape of bromine vapor into the environment during loading is completely eliminated, reducing economic losses and avoiding environmental pollution. The addition of a compressed air purging system solves the problem of residual bromine in the pipeline after loading, which currently relies on gravity flow or air pressure for bromine loading.

Description

Technical Field

[0001] This utility model belongs to the field of high-purity bromine treatment technology, specifically relating to a quantitative loading and exhaust gas recovery process system for bromine. Background Technology

[0002] In the current bromine production and storage process, bromine loading mainly relies on two methods: 1. Compressed air pressure delivery: This method artificially increases the internal pressure of a fixed storage tank by filling it with compressed air (or other inert gases such as nitrogen). The resulting pressure difference forces the highly corrosive and volatile liquid bromine through pipelines to the tank truck. This method requires an external air source and pressure control system. 2. Gravity flow: This method relies on the natural elevation difference created by the terrain or equipment layout. The bromine storage tank is positioned above the tank truck opening, and the bromine's own gravity allows it to flow naturally from the tank into the tank truck through connecting pipelines. This method has specific requirements for site planning and equipment installation height. However, whether relying on pneumatic pressure or gravity flow, the start-up, shutdown, and flow control of the loading process are relatively rudimentary. The lack of high-precision online metering instruments and automated loading control systems makes it difficult for operators to accurately monitor the actual amount of bromine loaded into the tank truck in real time, relying mainly on estimation or subsequent weighing on a weighbridge for verification. This can easily lead to overloading or underloading, making it impossible to accurately measure the amount of bromine loaded. Therefore, it not only affects the fairness of trade settlement, but overloading also brings safety hazards during transportation (such as overpressure in tank trucks due to thermal expansion).

[0003] Furthermore, bromine is highly volatile and toxic. During loading, especially when connecting and disconnecting pipes at the tanker opening and when the internal liquid level rises to displace air / inert gas, harmful exhaust gases containing high concentrations of bromine vapor are inevitably generated. Existing simplified loading processes generally lack effective closed-loop collection systems and corresponding exhaust gas purification devices. These highly toxic and corrosive bromine vapors are often directly and unorganizedly released into the atmosphere, posing a serious threat to the health of on-site operators (such as respiratory burns) and causing environmental pollution. Therefore, current bromine loading methods have significant shortcomings in terms of accurate measurement and environmental safety, urgently requiring the introduction of automated, closed-loop loading systems equipped with effective exhaust gas treatment facilities to improve inherent safety and environmental performance. Summary of the Invention

[0004] To improve the above-mentioned technical problems, this utility model provides a bromine quantitative loading and exhaust gas recovery system, including a bromine storage unit, a bromine quantitative loading unit, a compressed air purging unit, a DCS control unit, and an exhaust gas recovery unit. The bromine storage unit, the bromine metering loading unit, and the exhaust gas recovery unit are connected in sequence. The bromine storage unit is equipped with a compressed air purging unit on its loading pipeline. The DCS control unit is interlocked with the control valves and instrument units on each pipeline of the bromine storage unit, bromine metering unit, compressed air purging unit, and exhaust gas recovery unit.

[0005] According to the embodiment of this utility model, the bromine storage unit is provided with a bromine inlet, a first gas phase outlet, a first instrument unit, and a bromine outlet. The bromine inlet is connected to the upstream liquid bromine product production unit through a bromine inlet pipeline; the first gas phase outlet is connected to the tail gas recovery unit; and the bromine outlet is connected to the bromine quantitative loading unit.

[0006] In some implementations, the first instrument unit includes a level gauge and a differential pressure level gauge.

[0007] In some implementations, the bromine inlet is equipped with a feed shut-off valve, which is interlocked with the DCS control unit.

[0008] In some implementations, the bromine outlet is equipped with a discharge shut-off valve, which is interlocked with the DCS control unit.

[0009] In some implementations, a gas phase balance shut-off valve is provided at the first gas phase outlet, and the gas phase balance shut-off valve is interlocked with the DCS control unit.

[0010] According to an embodiment of this utility model, the bromine quantitative loading unit is provided with a tanker inlet and a second gas phase outlet. The tanker inlet is connected to the bromine outlet via a bromine loading pipeline; the second gas phase outlet is connected to a tail gas recovery unit. Preferably, the bromine loading pipeline is equipped with a mass flow meter.

[0011] In some implementations, the bromine loading pipeline is detachably connected to the bromine metering loading unit.

[0012] In some implementations, the tanker truck inlet is equipped with a tanker truck inlet shut-off valve, which is interlocked with the DCS control unit.

[0013] In some implementations, a tanker gas phase shut-off valve is provided at the second gas phase outlet, and the tanker gas phase shut-off valve is interlocked with the DCS control unit.

[0014] In some implementations, the first gas phase outlet and the second gas phase outlet are connected to the exhaust gas recovery unit via pipelines. For example, the pipelines are made of corrosion-resistant PVDF.

[0015] According to the embodiment of this utility model, the compressed air purging unit includes a pressure reducing valve, a safety valve, and a purging shut-off valve arranged in sequence. The pressure reducing valve is connected to the air delivery unit; the purging shut-off valve is connected to the bromine loading pipeline; and the pressure reducing valve, the safety valve, and the purging shut-off valve are all interlocked with the DCS control unit.

[0016] According to an embodiment of the present invention, the exhaust gas recovery unit includes a first absorption unit and a second absorption unit connected in sequence.

[0017] In some embodiments, the first absorption unit is a venting cooling tank (jacket). Preferably, the venting cooling tank is a jacketed steel-lined enamel tank. It is used for preliminary recovery of bromine, and the remaining non-condensable gases enter the second absorption unit.

[0018] In some implementations, the second absorption unit includes a bromine tail gas absorption tower, an absorbent circulation pump, and a second instrument unit. The second instrument unit is installed on the pipeline connecting the bromine tail gas absorption tower and the absorbent circulation pump, and the second instrument unit is interlocked with the DCS control unit.

[0019] In some implementations, the bromine tail gas absorption tower is provided with two layers of packing bed, which are connected to the absorption liquid circulation pump through an upper spray liquid distribution pipe and a lower spray liquid distribution pipe, respectively.

[0020] In this invention, the packing material for the two-layer packing bed can be a Taylor ring packing material made of polyvinylidene fluoride (PVDF).

[0021] In some implementations, the second instrument unit includes a flow meter (e.g., an electromagnetic flow meter) and an online pH meter. The online pH meter monitors the concentration of the alkali solution in real time, and automatically alarms when the pH is <8, requiring the alkali solution to be replaced.

[0022] According to an embodiment of this utility model, the system further includes a level regulating valve, which is connected to the absorbent outlet of the bromine tail gas absorption tower. The alkaline solution after absorption is sent to the bromine extraction process via the level regulating valve for bromine recovery and utilization.

[0023] In this invention, all pipelines are made of flexible metal tubing (lined with fluoropolymer).

[0024] The recovery process system is detachably connected to the bromine quantitative loading unit (liquid bromine tanker) via a metal hose. During loading, the bromine-containing tail gas that escapes first passes through the first absorption unit (the venting cooling tank is a jacketed steel-lined enamel tank). After the bromine-containing gas is condensed by the circulating water in the jacket, the bromine is initially recovered. The remaining non-condensable gas enters the second absorption unit (bromine tail gas absorption tower, which is equipped with two layers of packing bed to achieve full combination of absorbent and tail gas). Through the reaction and absorption of the absorbent, the bromine in the tail gas can be removed, ensuring that the tail gas meets emission standards. The flow rate of the absorbent is controlled and regulated by the absorbent circulation pump and electromagnetic flow meter, and the concentration of the alkali solution is monitored in real time by an online pH meter. When the pH is <8, an automatic alarm is triggered, and the alkali solution is replaced. The alkali solution that has completed absorption is sent to the bromine extraction process for bromine recovery and utilization.

[0025] This invention uses a compressed air purging system and a DCS control system to automatically transport bromine from the bromine storage unit to the bromine metering loading unit, and uses an exhaust gas recovery unit to recover the bromine vapor that escapes during the loading process.

[0026] The present invention provides a method for quantitative loading of bromine onto vehicles and exhaust gas recovery, comprising the following steps: (1) When the bromine storage unit is fed, the DCS control system opens the feed shut-off valve and the gas phase balance shut-off valve. Bromine enters the bromine storage unit through the bromine feed pipeline and the feed shut-off valve. The tail gas generated during feeding enters the tail gas recovery unit through the gas phase balance shut-off valve. The level gauge and differential pressure level gauge detect the liquid level in the bromine storage unit online. When the liquid level is too high, the feed shut-off valve is interlocked and closed, and the bromine storage unit completes feeding. (2) Bromine quantitative loading unit loading process: On-site operators connect the bromine loading pipeline and gas phase pipeline to the bromine quantitative loading unit through metal hoses (fluorine-lined); the tank truck feed shut-off valve, tank truck gas phase shut-off valve and discharge shut-off valve are opened in sequence through the DCS control system, and the bromine enters the bromine quantitative loading unit through the discharge shut-off valve, bromine loading pipeline and tank truck feed shut-off valve; the exhaust gas generated during loading enters the exhaust gas recovery unit through the tank truck gas phase shut-off valve; the loaded bromine is accurately measured by the mass flow meter, and when the accumulated value reaches the set value, the interlock tank truck feed shut-off valve and discharge shut-off valve are closed; the tank truck gas phase shut-off valve is closed in sequence in the DCS control system, and the tank truck feed shut-off valve and purging shut-off valve are opened to purge and recover the bromine remaining in the bromine loading pipeline and mass flow meter, and the purged exhaust gas enters the exhaust gas recovery system for treatment; after purging, the purging shut-off valve, tank truck feed shut-off valve and tank truck gas phase shut-off valve are closed in sequence to complete the quantitative loading of bromine; (3) Tail gas recovery process: The bromine-containing tail gas that escapes during loading and feeding first passes through the first absorption unit (venting cooling tank, which is a jacketed steel-lined enamel tank, where the bromine-containing gas is condensed by circulating water in the jacket), and the condensed bromine is recovered to the bromine storage unit; the remaining non-condensable gas enters the second tail gas recovery unit (bromine tail gas absorption tower, which is made of fiberglass lined with PPH; the bromine tail gas absorption tower is equipped with two layers of packing bed, and the two layers of packing are fed through the upper spray liquid distribution pipe and the lower spray liquid distribution pipe respectively, which can realize the full combination of the absorbent liquid and the tail gas). Through full reaction and absorption with the absorbent liquid, the bromine in the tail gas can be removed, ensuring that the tail gas meets the emission standards; the flow rate of the absorbent liquid is controlled and regulated by the absorbent liquid circulation pump and the electromagnetic flow meter, and the concentration of the alkali liquid is monitored in real time by the online pH meter. When the pH < 8, an automatic alarm is triggered and the alkali liquid is replaced; the alkali liquid that has been absorbed is sent to the bromine extraction process for bromine recovery and utilization.

[0027] The beneficial effects of this utility model are: (1) This utility model provides a bromine quantitative loading and exhaust gas recovery system. The system realizes the automated loading of bromine through a DCS control system and installs a corrosion-resistant mass flow meter on the bromine conveying pipeline to realize the "mass flow meter + DCS interlock" control mode for bromine loading. This achieves high-precision, automated, and accurate quantitative loading of bromine, significantly reduces measurement errors, and realizes accurate measurement of bromine. At the same time, this utility model realizes the full enclosure of the loading process and is equipped with an efficient and reliable exhaust gas recovery and treatment device to completely eliminate the escape of bromine vapor into the environment during the loading process, reduce economic losses, and avoid environmental pollution.

[0028] (2) By adding a compressed air purging system, the residual bromine in the pipeline and equipment is purged to the liquid bromine tanker for recycling, which solves the problem that the current bromine loading relies on gravity flow or air pressure, resulting in residual bromine in the pipeline after loading.

[0029] (3) This utility model realizes the full enclosure of the loading process and is equipped with an efficient and reliable exhaust gas recovery and treatment device to completely eliminate the escape of bromine vapor into the environment during the loading process, ensure that the treated exhaust gas meets the environmental protection emission requirements, and increase the economic benefits of the device. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the process system of this utility model; Numbering in the diagram: 1-Bromine feed line; 2-Feed shut-off valve; 3-Gas phase balance shut-off valve; 4-Bromine storage unit; 5-Level gauge; 6-Discharge shut-off valve; 7-Bromine loading line; 8-Mass flow meter; 9-Tank truck feed shut-off valve; 12-Tank truck gas phase shut-off valve; 13-Tail gas main pipe; 14-First absorption unit; 15-Pressure reducing valve; 16-Safety valve; 17-Purge shut-off valve; 18-Bromine tail gas absorption tower; 19-Absorbent circulating pump; 20-Electromagnetic flow meter; 21-Upper spray liquid distribution pipe; 22-Lower spray liquid distribution pipe; 23-Online pH meter; 24-Level regulating valve; 25-Differential pressure level gauge. Detailed Implementation

[0031] The technical solution of this utility model will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are only illustrative and explanatory of this utility model, and should not be construed as limiting the scope of protection of this utility model. All technologies implemented based on the above content of this utility model are covered within the scope of protection intended by this utility model.

[0032] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0033] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The term "connection" in this application, unless otherwise specified, includes both direct and indirect connections.

[0034] Example 1 Reference Figure 1 A bromine metering loading and exhaust gas recovery system includes a bromine storage unit 4, a bromine metering loading unit, a compressed air purging unit, a DCS control unit, and an exhaust gas recovery unit. The bromine storage unit 4, the bromine metering loading unit, and the exhaust gas recovery unit are connected in sequence; A compressed air purging unit is installed on the loading pipeline of bromine storage unit 4; The DCS control unit is interlocked with the control valves and instrument units on each pipeline of the bromine storage unit 4, the bromine quantitative loading unit, the compressed air purging unit, and the exhaust gas recovery unit.

[0035]

Bromine Storage Unit 4

[0036] The first instrument unit includes a level gauge 5 (a radar level gauge) and a differential pressure level gauge 25.

[0037] A feed shut-off valve 2 is provided on the bromine feed inlet, and the feed shut-off valve 2 is interlocked with the DCS control unit.

[0038] A discharge shut-off valve 6 is installed at the bromine discharge port, and the discharge shut-off valve 6 is interlocked with the DCS control unit.

[0039] A gas phase balance shut-off valve 3 is provided at the first gas phase outlet, and the gas phase balance shut-off valve 3 is interlocked with the DCS control unit.

[0040] [Bromine quantitative loading unit] The bromine quantitative loading unit is equipped with a tanker inlet and a second gas phase outlet. The tanker inlet is connected to the bromine outlet via the bromine loading pipeline 7; the second gas phase outlet is connected to the tail gas recovery unit. Preferably, the bromine loading pipeline is equipped with a mass flow meter.

[0041] The bromine loading pipeline 7 is detachably connected to the bromine metering loading unit.

[0042] The tank truck inlet is equipped with a tank truck inlet shut-off valve 9, which is interlocked with the DCS control unit.

[0043] The second gas phase outlet is equipped with a tank truck gas phase cut-off valve 12, which is interlocked with the DCS control unit.

[0044] The first gas phase outlet and the second gas phase outlet are connected to the exhaust gas recovery unit via pipelines. For example, the pipelines are made of corrosion-resistant PVDF.

[0045]

Compressed Air Purging Unit

[0046] [Exhaust Gas Recovery Unit] The exhaust gas recovery unit includes a first absorption unit 14 and a second absorption unit connected in sequence.

[0047] The first absorption unit 14 is a venting cooling tank (jacket). Preferably, the venting cooling tank is a jacketed steel-lined enamel tank. It is used for the initial recovery of bromine, and the remaining non-condensable gas enters the second absorption unit.

[0048] The second absorption unit includes a bromine tail gas absorption tower 18, an absorbent circulation pump 19, and a second instrument unit. The second instrument unit is installed on the pipeline connecting the bromine tail gas absorption tower 18 and the absorbent circulation pump 19. The second instrument unit is interlocked with the DCS control unit.

[0049] The bromine tail gas absorption tower 18 is equipped with two layers of packing bed (the packing is made of polyvinylidene fluoride (PVDF) material Taylor ring packing), and the two layers of packing bed are connected to the absorption liquid circulation pump 19 through the upper spray liquid distribution pipe 21 and the lower spray liquid distribution pipe 22 respectively.

[0050] The second instrument unit includes a flow meter (e.g., electromagnetic flow meter 20) and an online pH meter 23. The online pH meter 23 monitors the concentration of the alkaline solution in real time, and automatically alarms when the pH is <8, requiring the alkaline solution to be replaced.

[0051] The system also includes a level regulating valve 24, which is connected to the absorbent outlet of the bromine tail gas absorption tower 18. The alkaline solution after absorption is sent to the bromine extraction process via the level regulating valve for bromine recovery and reuse.

[0052] In this embodiment, all pipelines are made of flexible metal tubing (lined with fluoropolymer).

[0053] The recovery process system is detachably connected to the bromine quantitative loading unit (liquid bromine tanker) via a metal hose. During loading, the bromine-containing tail gas that escapes first passes through the first absorption unit (the venting cooling tank is a jacketed steel-lined enamel tank). After the bromine-containing gas is condensed by the circulating water in the jacket, the bromine is initially recovered. The remaining non-condensable gas enters the second absorption unit (bromine tail gas absorption tower 18, which is equipped with two layers of packing bed to achieve full combination of absorbent and tail gas). Through the reaction and absorption of the absorbent, the bromine in the tail gas can be removed, ensuring that the tail gas meets emission standards. The flow rate of the absorbent is regulated by the absorbent circulation pump 19 and the electromagnetic flow meter 20, and the concentration of the alkali solution is monitored in real time by the online pH meter 23. When the pH < 8, an automatic alarm is triggered, and the alkali solution is replaced. The alkali solution that has completed absorption is sent to the bromine extraction process for bromine recovery and utilization.

[0054] The method for quantitative loading of bromine and exhaust gas recovery in the above system includes the following steps: (1) When the bromine storage unit 4 is fed, the DCS control system opens the feed shut-off valve 2 and the gas phase balance shut-off valve 3. Bromine enters the bromine storage unit 4 through the bromine feed pipeline 1 and the feed shut-off valve 2. The tail gas generated during feeding enters the tail gas recovery unit through the gas phase balance shut-off valve 3. The level gauge 5 and the differential pressure level gauge 6 detect the liquid level in the bromine storage unit 4 online. When the liquid level reaches 80%, the feed shut-off valve 2 is interlocked and closed, and the bromine storage unit 4 completes feeding. (2) Bromine quantitative loading unit loading process: On-site operators connect the bromine loading pipeline 7 and the gas phase pipeline to the bromine quantitative loading unit through metal hoses (fluoropolymer lined); the DCS control system sequentially opens the tanker gas phase shut-off valve 12, the tanker feed shut-off valve 9, and the discharge shut-off valve 6, and the bromine enters the bromine quantitative loading unit through the discharge shut-off valve 6, the bromine loading pipeline 7, and the tanker feed shut-off valve 9; the exhaust gas generated during loading enters the exhaust gas recovery unit through the tanker gas phase shut-off valve 12; the loaded bromine is accurately measured by the mass flow meter 8, and when the cumulative amount is... When the load reaches 15 tons (generally, a tank truck can be loaded with 15 tons, but the specific value can be modified according to the loading capacity of the tank truck), the interlocked tank truck inlet shut-off valve 9 and outlet shut-off valve 6 are closed; in the DCS control system, the tank truck gas phase shut-off valve 12 is closed in sequence, and the tank truck inlet shut-off valve 9 and purging shut-off valve 17 are opened to purge and recover the bromine remaining in the bromine loading pipeline 7 and mass flow meter 8. The purge exhaust gas enters the exhaust gas recovery system for treatment; after the purging is completed, the purging shut-off valve 17, the tank truck inlet shut-off valve 9 and the tank truck gas phase shut-off valve 12 are closed in sequence to complete the quantitative loading of bromine; (3) Tail gas recovery process: The bromine-containing tail gas that escapes during loading and feeding first passes through the first absorption unit 14 (venting cooling tank, which is a jacketed steel-lined enamel tank, and the bromine-containing gas is condensed by circulating water in the jacket). The condensed bromine is recovered to the bromine storage unit 4. The remaining non-condensable gas enters the second tail gas recovery unit (bromine tail gas absorption tower 18, which is made of fiberglass lined with PPH; the bromine tail gas absorption tower 18 is equipped with two layers of packing bed, and the two layers of packing are fed through the upper spray liquid distribution pipe 21 and the lower spray liquid distribution pipe 22 respectively, so as to achieve full combination of absorption liquid and tail gas). Through full reaction and absorption with absorption liquid, the bromine in the tail gas can be removed to ensure that the tail gas meets the emission standards. The flow rate of absorption liquid is controlled and regulated by the absorption liquid circulation pump (which is a variable frequency pump) and electromagnetic flow meter. The online pH meter monitors the concentration of alkali solution in real time. When pH < 8, an automatic alarm is triggered and the alkali solution is replaced. The alkali solution that has been absorbed is sent to the bromine extraction process to recover and utilize the bromine.

[0055] 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 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 spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A bromine metering loading and exhaust gas recovery system, characterized in that, It includes a bromine storage unit, a bromine metering unit, a compressed air purging unit, a DCS control unit, and an exhaust gas recovery unit; The bromine storage unit, the bromine metering loading unit, and the exhaust gas recovery unit are connected in sequence. The bromine storage unit is equipped with a compressed air purging unit on its loading pipeline. The DCS control unit is interlocked with the control valves and instrument units on each pipeline of the bromine storage unit, bromine metering unit, compressed air purging unit, and exhaust gas recovery unit.

2. The system of claim 1, wherein, The bromine storage unit is equipped with a bromine inlet, a first gas phase outlet, a first instrument unit, and a bromine outlet. The bromine inlet is connected to the upstream liquid bromine product production unit through a bromine inlet pipeline; the first gas phase outlet is connected to the tail gas recovery unit; and the bromine outlet is connected to the bromine quantitative loading unit.

3. The system of claim 2, wherein, The first instrument unit includes a level gauge and a differential pressure level gauge; And / or, the bromine inlet is provided with a feed shut-off valve, which is interlocked with the DCS control unit; And / or, the bromine outlet is provided with a discharge shut-off valve, which is interlocked with the DCS control unit.

4. The system of claim 2, wherein, A gas phase balance shut-off valve is provided on the first gas phase outlet, and the gas phase balance shut-off valve is interlocked with the DCS control unit.

5. The system of any of claims 2-4, wherein, The bromine quantitative loading unit is equipped with a tanker inlet and a second gas phase outlet. The tanker inlet is connected to the bromine outlet via a bromine loading pipeline. The second gas phase outlet is connected to the tail gas recovery unit.

6. The system of claim 5, wherein, The bromine loading pipeline is equipped with a mass flow meter; The bromine loading pipeline and the bromine quantitative loading unit are detachably connected. The tanker truck inlet is equipped with a tanker truck inlet shut-off valve, which is interlocked with the DCS control unit; The second gas phase outlet is equipped with a tank truck gas phase cut-off valve, which is interlocked with the DCS control unit; The first gas phase outlet and the second gas phase outlet are respectively connected to the exhaust gas recovery unit through pipelines.

7. The system of any one of claims 1-4, wherein, The compressed air purging unit includes a pressure reducing valve, a safety valve, and a purging shut-off valve arranged in sequence. The pressure reducing valve is connected to the air delivery unit; the purging shut-off valve is connected to the bromine loading pipeline; and the pressure reducing valve, safety valve, and purging shut-off valve are all interlocked with the DCS control unit.

8. The system according to any one of claims 1-4, characterized in that, The exhaust gas recovery unit includes a first absorption unit and a second absorption unit connected in sequence. The first absorption unit is a venting cooling tank; The second absorption unit includes a bromine tail gas absorption tower, an absorbent circulation pump, and a second instrument unit. The second instrument unit is installed on the pipeline connecting the bromine tail gas absorption tower and the absorbent circulation pump, and the second instrument unit is interlocked with the DCS control unit.

9. The system of claim 8, wherein, The bromine tail gas absorption tower is equipped with two layers of packing bed, which are connected to the absorption liquid circulation pump through the upper spray liquid distribution pipe and the lower spray liquid distribution pipe, respectively.

10. The system of any one of claims 1-4, wherein, The system also includes a level regulating valve, which is connected to the absorbent outlet of the bromine tail gas absorption tower.

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