Automatic fire extinguishing system and method for liquid sulfur pool and application

Abstract

The invention discloses an automatic fire extinguishing system and method for a liquid sulfur pool and application. The automatic fire extinguishing system comprises a stop valve, at least one temperature transmitter, a gas supply source, a flame detector and a control system, the stop valve, the temperature transmitter and the flame detector are connected with the control system; the temperature transmitter is arranged above the liquid sulfur pool and is used for detecting the temperature in the liquid sulfur pool and transmitting the temperature to the control system; the flame detector is arranged above the liquid sulfur pool and is used for detecting the flame state in the liquid sulfur pool and transmitting the flame state to the control system; the stop valve is communicated with a gas supply source and the liquid sulfur pool through a gas supply pipeline; the control system is used for controlling the cut-off valve to be opened when the temperature value of the at least one temperature transmitter reaches a first set value or the flame detector detects flame; after the flame detector detects that the flame is extinguished and the temperature value of each temperature transmitter is reduced to a second set value, the stop valve is controlled to be closed; the first set value is greater than the second set value. And automatic fire extinguishing can be achieved, response is rapid, fire extinguishing is timely, and the safety degree is high.

Description

Technical Field

[0001] The present invention relates to an automatic fire extinguishing system, method and application of a liquid sulfur pool. Background Art

[0002] Liquid sulfur generated by the sulfur recovery unit is typically stored in a liquid sulfur pool before being formed. Sulfur has an auto-ignition temperature between 252.8°C and 266.1°C and is easily ignited in the presence of oxygen. Sulfur's flash point is between 167.8°C and 187.2°C, so when liquid sulfur is exposed to temperatures above this, the risk of sulfur fire must be considered. Furthermore, liquid sulfur easily accumulates, generating static electricity, which can cause sulfur fires or explosions.

[0003] In the article "Analysis on the Application of Waste Gas Recovery Technology in Liquid Sulfur Pools of Large Sulfur Plants" published in "Oil and Gas Field Surface Engineering", Zhang Lisheng, Cao Yingbin, Pei Aixia and others mentioned that when the liquid sulfur pool catches fire, the waste gas temperature rises abnormally, the medium-pressure steam shut-off valve and the waste gas into the main combustion furnace shut-off valve are immediately closed, and low-pressure steam is used manually on site to extinguish the liquid sulfur pool. Summary of the Invention

[0004] The inventors have discovered that the existing technology uses manual fire extinguishing to extinguish liquid sulfur pools. However, if the fire is not extinguished in a timely manner, manual fire extinguishing can easily create a fire hazard. The present invention aims to provide an automatic fire extinguishing system, method, and application for liquid sulfur pools. This system addresses the issue of manual fire extinguishing, achieving automatic fire extinguishing with a rapid response, effectively resolving the issue of delayed manual fire extinguishing. It also eliminates the need for operators to approach the fire scene, resulting in a high level of safety.

[0005] In a first aspect, an embodiment of the present application provides an automatic fire extinguishing system for a liquid sulfur pool, comprising: a shut-off valve, at least one temperature transmitter, an air supply source, a flame detector, and a control system;

[0006] The shut-off valve, the temperature transmitter and the flame detector are connected to the control system;

[0007] The temperature transmitter is arranged above the liquid sulfur pool, and is used to detect the temperature in the liquid sulfur pool and transmit it to the control system;

[0008] The flame detector is arranged above the liquid sulfur pool and is used to detect the flame state in the liquid sulfur pool and transmit it to the control system;

[0009] The shut-off valve connects the gas supply source and the liquid sulfur pool through a gas supply pipeline;

[0010] The control system is configured to control the shut-off valve to open when the temperature value of the at least one temperature transmitter reaches a first set value or the flame detector detects a flame; and to control the shut-off valve to close when the flame detector detects that the flame is extinguished and the temperature value of each temperature transmitter drops to a second set value; wherein the first set value is greater than the second set value.

[0011] In one or some optional embodiments of the embodiment of the present application, a bursting disc is further included; the bursting disc is arranged in the gas supply pipeline between the shut-off valve and the liquid sulfur pool;

[0012] When the control system controls the shut-off valve to be in an open state, the fire-extinguishing steam in the gas supply source can break the bursting disc and send the fire-extinguishing steam into the liquid sulfur pool.

[0013] In one or some optional implementations of the embodiment of the present application, an audible and visual alarm is further included, and the control system includes a SIS control system and a DCS control system;

[0014] The SIS control system is connected to the shut-off valve, the temperature transmitter, and the flame detector, and is configured to control the shut-off valve to open when the temperature value of at least one temperature transmitter reaches a first set value or the flame detector detects a flame; and to control the shut-off valve to close when the flame detector detects that the flame is extinguished and the temperature value of each temperature transmitter drops to a second set value;

[0015] The DCS control system is connected to the SIS control system and the sound and light alarm; the SIS control system is configured to send a start alarm message to the DCS control system when the temperature value of the at least one temperature transmitter reaches a first set value or the flame detector detects a flame; and send a stop alarm message to the DCS control system when the flame detector detects that the flame is extinguished and the temperature value of each temperature transmitter drops to a second set value;

[0016] The DCS control system is used to control the sound and light alarm to start the alarm according to the start alarm information, and to control the sound and light alarm to stop the alarm according to the stop alarm information.

[0017] In one or some optional implementations of the embodiment of the present application, a steam jacket flange is provided at the interface between the gas supply pipe and the liquid sulfur pool, and the bursting disc is provided on the steam jacket flange.

[0018] In one or some optional implementations of the embodiment of the present application, the temperature transmitter includes a temperature measuring element and a transmission module;

[0019] The temperature measuring elements are all fixed to the inner wall of the liquid sulfur pool and are arranged above the liquid surface of the liquid sulfur pool;

[0020] The temperature measuring element is connected to the input end of the transmitter module through a wire, and the output end of the transmitter module is connected to the SIS control system.

[0021] In one or some optional implementations of the embodiment of the present application, the temperature measuring element is a thermocouple.

[0022] In one or some optional implementations of the embodiment of the present application, the conductor is a two-wire shielded compensation conductor.

[0023] In one or some optional implementations of the embodiment of the present application, the temperature transmitter includes a first temperature transmitter and a second temperature transmitter.

[0024] In one or some optional implementations of the embodiment of the present application, the first set value is 180-220°C; the second set value is 140-160°C.

[0025] In a second aspect, the present application provides a method for automatically extinguishing a liquid sulfur pool fire, which uses the liquid sulfur pool automatic fire extinguishing system described in the first aspect, including the following methods and steps:

[0026] S1. At least one temperature transmitter detects the temperature in the liquid sulfur pool in real time and transmits it to a control system, and the flame detector detects the flame state in the liquid sulfur pool in real time and transmits it to the control system;

[0027] S2. When the temperature value of the at least one temperature transmitter reaches a first set value or the flame detector detects a flame, the control system controls the shut-off valve to open, so that the gas supply source is connected to the liquid sulfur pool through the gas supply pipeline, and gas is supplied to the liquid sulfur pool for fire extinguishing;

[0028] S3. When the temperature value detected by each temperature transmitter drops to a second set value and the flame detector detects that the flame is extinguished, the control system controls the shut-off valve to close, so that the gas supply source and the liquid sulfur pool are sealed.

[0029] In a third aspect, the present application provides an application of the liquid sulfur pool automatic fire extinguishing system in the first aspect in a liquid sulfur pool.

[0030] The beneficial effects of the above technical solutions provided by the embodiments of the present application include at least:

[0031] The present invention provides an automatic fire extinguishing system, method, and application for liquid sulfur pools. The present invention aims to provide an automatic fire extinguishing system for liquid sulfur pools that solves the problem of manual fire extinguishing, offering more accurate control and convenient operation. This system enables automatic control, achieving automatic fire extinguishing functionality; saves labor costs and improves production efficiency; provides rapid response, effectively addressing the issue of delayed manual fire extinguishing; and offers a high level of safety, eliminating the need for operators to approach the fire scene, thus avoiding the potential HSE risks associated with manual fire extinguishing.

[0032] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present application can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0033] The technical solution of the present application is further described in detail below through the accompanying drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0035] Figure 1 A schematic diagram of the structure of the automatic fire extinguishing system for a liquid sulfur pool provided in an embodiment of the present application;

[0036] Figure 2 This is a structural block diagram of the liquid sulfur pool automatic fire extinguishing system provided in an embodiment of the present application;

[0037] Figure 3 Flowchart of the automatic fire extinguishing system for a liquid sulfur pool provided in an embodiment of the present application;

[0038] Figure 4 A flow chart of the automatic fire extinguishing method for a liquid sulfur pool provided in an embodiment of the present application;

[0039] Description of reference numerals:

[0040] 1 is the shut-off valve; 2 is the temperature transmitter; 3 is the bursting disc; 4 is the flame detector. DETAILED DESCRIPTION

[0041] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0042] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0043] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0044] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0045] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0046] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0047] It should be understood that the size of the serial numbers of the steps in the following embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0048] In order to illustrate the technical solution of the present application, specific embodiments are provided below.

[0049] The inventors have discovered that the existing technology uses manual fire extinguishing to extinguish liquid sulfur pools. This long response time can easily lead to delayed fire extinguishing, resulting in more serious fire hazards. Furthermore, manual fire extinguishing can easily cause harm to personnel, leading to safety accidents. Based on this, the inventors have provided an automatic fire extinguishing system, method, and application for liquid sulfur pools. This system addresses the issue of manual fire extinguishing, achieving automatic fire extinguishing with a fast response, effectively resolving the issue of delayed manual fire extinguishing. It also eliminates the need for operators to approach the fire scene, resulting in a high level of safety.

[0050] Example 1

[0051] See Figure 1 An embodiment of the present application provides an automatic fire extinguishing system for a liquid sulfur pool, comprising: a shut-off valve 1, at least one temperature transmitter 2, an air supply source (not shown in the figure), a flame detector 4, and a control system (not shown in the figure), wherein the shut-off valve 1, the temperature transmitter 2, and the flame detector 4 are all connected to the control system, the temperature transmitter 2 is arranged above the liquid sulfur pool, and is used to detect the temperature in the liquid sulfur pool in real time and transmit it to the control system, the flame detector 4 is arranged above the liquid sulfur pool, and is used to detect the flame state in the liquid sulfur pool in real time and transmit it to the control system, and the shut-off valve 1 connects the air supply source and the liquid sulfur pool through an air supply pipe (not shown in the figure).

[0052] In this embodiment, a plurality of temperature transmitters 2 and flame detectors 4 are provided to detect the temperature and flame state in the liquid sulfur pool in real time. The control system receives and processes the temperature data and flame state signals transmitted by the temperature transmitters 2 and the flame detectors 4. When the temperature value of at least one temperature transmitter 2 reaches a first set value or the flame detector 4 detects a flame, the control system controls the shut-off valve 1 to open, thereby connecting the gas supply source with the liquid sulfur pool, and allowing the fire-extinguishing steam in the gas supply source to be transported to the liquid sulfur pool through the gas supply pipeline to extinguish the fire. When the flame detector 4 detects that the flame is extinguished and the temperature value of each temperature transmitter 2 drops to a second set value (the first set value is greater than the second set value), the control system controls the shut-off valve 1 to close, thereby sealing the gas supply source from the liquid sulfur pool, and the gas supply source no longer provides fire-extinguishing steam to the liquid sulfur pool. This embodiment realizes automatic fire extinguishing of the liquid sulfur pool, detects the temperature and flame data in the liquid sulfur pool in real time, responds quickly and initiates fire extinguishing, and avoids the long response time of manual fire extinguishing in the prior art, which causes the fire to spread further and leads to more serious fires. At the same time, the operator does not need to approach the fire scene, avoiding the HSE risks that may be caused by manual fire extinguishing, and has a high level of safety.

[0053] In one embodiment, see Figure 2 and Figure 3The liquid sulfur pool automatic fire extinguishing system also includes an audible and visual alarm (not shown in the figure). The control system includes an SIS control system and a DCS control system. The SIS control system is connected to the shut-off valve 1, the temperature transmitter 2 and the flame detector 4. The DCS control system is connected to the SIS control system through hard-wired communication, wherein the hard-wired communication method can adopt Modbus communication. The DCS control system is connected to the audible and visual alarm.

[0054] See Figure 3 An embodiment using two temperature transmitters 2 is provided. When in use, the SIS control system receives detection data from the temperature transmitter 2 and the flame detector 4. When the temperature value of the temperature transmitter 2 (i.e., TT0001A / TT0001B shown in the figure) reaches a first set value or the temperature value of the flame detector 4 (i.e., BE0001B shown in the figure), the SIS control system controls the shut-off valve 1 (i.e., XV-0001 shown in the figure) to open, connecting the gas supply source with the liquid sulfur pool, so that the fire extinguishing steam in the gas supply source is transported to the liquid sulfur pool through the gas supply pipeline to extinguish the fire, and sends a start alarm message to the DCS control system. The DCS control system controls the sound and light alarm to start the alarm based on the start alarm message. After the flame detector 4 detects that the flame is extinguished and the temperature value of each temperature transmitter 2 drops to a second set value, the SIS control system controls the shut-off valve 1 to close, so that the gas supply source is no longer connected to the liquid sulfur pool, and sends a stop alarm message to the DCS control system. The DCS control system controls the sound and light alarm to stop the alarm based on the stop alarm message. The SIS control system and DCS control system can detect the temperature and flame data in the liquid sulfur pool in real time. When a fire occurs in the liquid sulfur pool, the gas supply source is automatically started to connect with the liquid sulfur pool and deliver fire extinguishing steam to extinguish the fire. The staff are alerted through the sound and light alarm. During the entire process, there is no need for staff to participate in the fire extinguishing work, which can avoid the safety risks that may be caused by manual fire extinguishing. The automatic fire extinguishing process responds quickly and can extinguish the fire in time to avoid worsening the fire.

[0055] In one embodiment, see Figure 1The automatic fire extinguishing system for the liquid sulfur pool also includes a bursting disc 3, which is installed in the air supply pipe between the shut-off valve 1 and the liquid sulfur pool. Specifically, a steam-jacketed flange (not shown) is provided at the interface between the air supply pipe and the liquid sulfur pool, and the bursting disc 3 is mounted on the steam-jacketed flange. During operation, the control system maintains the shut-off valve 1 in an open state, connecting the air supply source to the liquid sulfur pool. The fire-extinguishing steam within the air supply source can break the bursting disc 3, sending the fire-extinguishing steam into the liquid sulfur pool. The presence of the bursting disc 3 effectively blocks the sulfur vapor within the liquid sulfur pool from flowing into the air supply pipe, thereby preventing the sulfur vapor from condensing and clogging the pipe, preventing the fire-extinguishing steam from entering the liquid sulfur pool and causing the automatic fire extinguishing system to fail. Therefore, by installing the bursting disc 3, the fire-extinguishing steam can enter the liquid sulfur pool smoothly in the event of a fire, extinguishing the fire promptly and quickly, and improving the efficiency of the automatic fire extinguishing system.

[0056] In other embodiments, a pressure regulating valve and a pressure gauge can be set between the gas supply source and the shut-off valve 1, and the pressure gauge is installed downstream of the pressure regulating valve. The gas pressure in the gas supply pipeline can be controlled by the pressure regulating valve, and the gas pressure value can be displayed in real time by the pressure gauge to ensure that the gas supply volume can meet the fire prevention and fire extinguishing requirements, and the gas supply process is safe and reliable.

[0057] In other embodiments, the gas supply pipeline includes a gas supply main and a gas supply branch pipe, and the shut-off valve 1 is installed on the gas supply main. One end of the gas supply main is connected to the gas supply source, and one end of one or more gas supply branches are respectively connected to the other end of the gas supply main. The other ends of one or more gas supply branches are respectively connected to the liquid sulfur pool and are evenly distributed over the liquid sulfur pool. The number of gas supply branches can be adjusted according to the area of ​​the liquid sulfur pool so that the gas supply range formed by each gas supply branch covers the liquid sulfur pool. This facilitates the flow of fire extinguishing steam from each gas supply branch pipe to the liquid sulfur pool during subsequent fire extinguishing operations. The fire extinguishing steam can quickly act on the entire liquid sulfur pool, achieving efficient fire prevention and fire extinguishing effects.

[0058] In one embodiment, see Figure 1-Figure 3 The temperature transmitter 2 includes a temperature measuring element (not shown) and a transmission module (not shown). The temperature measuring element is fixed to the inner wall of the liquid sulfur tank and located above the liquid level. The temperature measuring element is connected to the input of the transmission module via a wire, and the output of the transmission module is connected to the SIS control system. The temperature measuring element can be a thermocouple, and the wire can be a two-wire shielded compensating wire to ensure signal data transmission.

[0059] In this embodiment, the number of temperature transmitters 2 can be adjusted according to the area of ​​the liquid sulfur pool to ensure that the temperature measurement range formed by each temperature transmitter 2 covers the liquid sulfur pool. Each temperature transmitter 2 includes a temperature measuring element and a transmission module. Figure 3An embodiment is provided in which two temperature transmitters 2 are provided. The temperature transmitters 2 include a first temperature transmitter (i.e., TT0001A in the figure) and a second temperature transmitter (i.e., TT0001B in the figure). Both the first and second temperature transmitters include the aforementioned temperature measuring elements and transmitter modules. During use, each temperature measuring element placed in the liquid sulfur pool monitors the temperature in real time, converts the monitored temperature into a respective temperature sensing signal (voltage signal), and transmits it to the corresponding transmitter module. Each transmitter module converts the temperature sensing signal into a temperature signal (current signal), transmits the temperature signal to the SIS control system, and processes the temperature signal. When the temperature value corresponding to the temperature signal exceeds a first set value, the SIS control system opens the shut-off valve 1 and sends a start alarm message to the DCS control system. The DCS control system controls the sound and light alarm to activate the alarm based on the start alarm message. When the temperature value corresponding to the temperature signal falls below a second set value, the shut-off valve 1 is controlled to close, disconnecting the gas supply source from the liquid sulfur pool, and sends a stop alarm message to the DCS control system. The DCS control system controls the sound and light alarm to stop the alarm based on the stop alarm message.

[0060] In a specific embodiment, since the auto-ignition temperature of sulfur is between 252.8°C and 266.1°C, it is easy to ignite when oxygen is present in the environment. The flash point of sulfur is between 167.8°C and 187.2°C. When the liquid sulfur is higher than this temperature, there is a risk of sulfur ignition. Therefore, the first set value can be set to 180°C to 220°C, and the second set value can be set to 140°C to 160°C. There is no risk of self-ignition in the liquid sulfur pool.

[0061] Example 2

[0062] See Figure 4 The present application provides a method for automatically extinguishing a liquid sulfur pool fire. The method adopts the liquid sulfur pool automatic fire extinguishing system of Example 1 and includes the following methods and steps:

[0063] Step S1, at least one temperature transmitter detects the temperature in the liquid sulfur pool in real time and transmits it to the control system, and a flame detector detects the flame state in the liquid sulfur pool in real time and transmits it to the control system.

[0064] Step S2: When the temperature value of at least one temperature transmitter reaches a first set value or the flame detector detects a flame, the control system controls the shut-off valve to open, so that the gas supply source is connected to the liquid sulfur pool through the gas supply pipeline, and gas is supplied to the liquid sulfur pool for fire extinguishing.

[0065] Step S3: When the temperature value detected by each temperature transmitter drops to the second set value and the flame detector detects that the flame is extinguished, the control system controls the shut-off valve to close, so that the gas supply source and the liquid sulfur pool are sealed.

[0066] Example 3

[0067] The present application provides the application of the liquid sulfur pool automatic fire extinguishing system in Example 1 in a liquid sulfur pool. A temperature transmitter and a flame detector are used to monitor the temperature and flame status in the liquid sulfur pool in real time and transmit them to the control system. The control system determines whether the liquid sulfur pool is on fire based on the temperature and flame status. When the temperature value of at least one temperature transmitter reaches a first set value or the flame detector detects a flame, the control system controls the shut-off valve to open, connecting the gas supply source with the liquid sulfur pool, and allowing the fire extinguishing steam in the gas supply source to be transported to the liquid sulfur pool through the gas supply pipeline to extinguish the fire. When the flame detector detects that the flame is extinguished and the temperature value of each temperature transmitter drops to a second set value, the control system controls the shut-off valve to close, sealing the gas supply source from the liquid sulfur pool, and the gas supply source no longer provides fire extinguishing steam to the liquid sulfur pool. The liquid sulfur pool automatic fire extinguishing system can effectively prevent and extinguish fires, with a rapid fire extinguishing response and a high degree of safety. The operator does not need to approach the fire scene, avoiding the HSE risks that may be caused by manual fire extinguishing.

[0068] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A liquid sulfur pool automatic fire extinguishing system, characterized in that: include: a shut-off valve, at least one temperature transmitter, a gas supply, a flame detector, and a control system; The shut-off valve, the temperature transmitter and the flame detector are connected to the control system; The temperature transmitter is arranged above the liquid sulfur pool, and is used to detect the temperature in the liquid sulfur pool and transmit it to the control system; The flame detector is arranged above the liquid sulfur pool, and is used to detect the flame state in the liquid sulfur pool and transmit it to the control system; The shut-off valve is connected to the gas supply source and the liquid sulfur pool through a gas supply pipeline; The control system is used to control the shut-off valve to open when the temperature value of at least one temperature transmitter reaches a first set value or the flame detector detects a flame; and to control the shut-off valve to close after the flame detector detects that the flame is extinguished and the temperature value of each temperature transmitter drops to a second set value; wherein the first set value is greater than the second set value.

2. The liquid sulfur pool automatic fire extinguishing system according to claim 1, characterized in that: It also includes a bursting disc; the bursting disc is arranged in the gas supply pipeline between the cut-off valve and the liquid sulfur pool; When the control system controls the cut-off valve to be in an open state, the fire-extinguishing steam in the gas supply source can break the bursting disc and send the fire-extinguishing steam into the liquid sulfur pool.

3. The liquid sulfur pool automatic fire extinguishing system according to claim 1 or 2, characterized in that: It also includes an audible and visual alarm, and the control system includes a SIS control system and a DCS control system; The SIS control system is connected to the cut-off valve, the temperature transmitter and the flame detector, and is used to control the cut-off valve to open when the temperature value of at least one temperature transmitter reaches a first set value or the flame detector detects a flame; and to control the cut-off valve to close after the flame detector detects that the flame is extinguished and the temperature value of each temperature transmitter drops to a second set value; The DCS control system is connected to the SIS control system and the sound and light alarm; the SIS control system is used to send a start alarm message to the DCS control system when the temperature value of the at least one temperature transmitter reaches a first set value or the flame detector detects a flame; and send a stop alarm message to the DCS control system after the flame detector detects that the flame is extinguished and the temperature value of each temperature transmitter drops to a second set value; The DCS control system is used to control the sound and light alarm to start the alarm according to the start alarm information, and to control the sound and light alarm to stop the alarm according to the stop alarm information.

4. The liquid sulfur pool automatic fire extinguishing system according to claim 3 is characterized in that: A steam jacket flange is provided at the interface between the gas supply pipeline and the liquid sulfur pool, and the bursting disc is provided on the steam jacket flange.

5. The liquid sulfur pool automatic fire extinguishing system according to claim 1 or 3, characterized in that: The temperature transmitter includes a temperature measuring element and a transmission module; The temperature measuring elements are all fixed to the inner wall of the liquid sulfur pool and arranged above the liquid surface of the liquid sulfur pool; The temperature measuring element is connected to the input end of the transmitter module through a wire, and the output end of the transmitter module is connected to the SIS control system.

6. The liquid sulfur pool automatic fire extinguishing system according to claim 5, characterized in that: The temperature measuring element is a thermocouple.

7. The automatic fire extinguishing system for liquid sulfur pool according to claim 5 or 6, characterized in that: The conductor is a two-wire shielded compensation conductor.

8. The automatic fire extinguishing system for a liquid sulfur pool according to any one of claims 1 to 7, characterized in that: The temperature transmitter includes a first temperature transmitter and a second temperature transmitter.

9. The liquid sulfur pool automatic fire extinguishing system according to claim 7, characterized in that: The first setting value is 180-220°C; the second setting value is 140-160°C.

10. A method for automatic fire extinguishing in a liquid sulfur pool, characterized in that: The liquid sulfur pool automatic fire extinguishing system according to any one of claims 1 to 9 comprises the following methods and steps: S1, at least one temperature transmitter detects the temperature in the liquid sulfur pool in real time and transmits it to the control system, and the flame detector detects the flame state in the liquid sulfur pool in real time and transmits it to the control system; S2. When the temperature value of the at least one temperature transmitter reaches a first set value or the flame detector detects a flame, the control system controls the shut-off valve to open, so that the gas supply source is connected to the liquid sulfur pool through the gas supply pipeline, and gas is supplied to the liquid sulfur pool for fire extinguishing; S3. When the temperature value detected by each temperature transmitter drops to the second set value and the flame detector detects that the flame is extinguished, the control system controls the shut-off valve to close, so that the gas supply source and the liquid sulfur pool are sealed.

11. Use of the liquid sulfur pool automatic fire extinguishing system according to any one of claims 1 to 9 in a liquid sulfur pool.

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