Hazardous chemical substance production plant side wall exhaust fan capable of being started and stopped in interlocking mode

Abstract

The utility model discloses an interlocking start-stop hazardous chemical substance production plant side wall exhaust fan, which relates to the technical field of fire prevention and explosion prevention in petrochemical industry production, and comprises a hazardous chemical substance plant, a hazardous chemical substance production device, a fixed gas detector, a side wall exhaust fan, a central control computer and a PLC (programmable logic controller), a fixed gas detector is mounted at a hazardous chemical substance production device in the hazardous chemical substance plant, a side wall exhaust fan is arranged on the wall of the hazardous chemical substance plant, and the start and stop of the side wall exhaust fan are controlled in an interlocking manner through a PLC (Programmable Logic Controller), the fixed gas detector and a central control computer. The system has the characteristics of real-time monitoring and early warning and automatic start and stop, and is used for solving the problems that the power consumption is too high when the exhaust fan runs for a long time, the material accessories and loss of the fan are high, the side wall exhaust fan is started when the side wall exhaust fan intermittently runs under the condition that the concentration of combustible or poisonous steam in a plant is high, and the risk that an operator enters the plant to start the side wall exhaust fan is large.

Description

Technical Field

[0001] The utility model relates to the technical field of fire prevention and explosion prevention in petrochemical production, in particular to a side wall exhaust fan of a hazardous chemical production plant with interlocked start and stop. Background Art

[0002] In the domestic organic chemical production process, there are many hazardous chemical production units involved. The division of units follows the principle of division by factory building or workshop. In the entire organic chemical production process, most of the raw materials, intermediates and finished products involved are hazardous chemicals. These hazardous chemicals usually have characteristics showing that they are flammable, explosive, toxic and harmful. Especially when hazardous chemicals leak in a relatively sealed production plant, it is very easy to cause fire and explosion of the plant, poisoning and suffocation of workers, and there are major safety hazards.

[0003] To prevent the accumulation of flammable or toxic vapors, flameproof sidewall exhaust fans are installed in all factory buildings in current hazardous chemical leak monitoring safety facilities. These fans consume excessive power when in operation, leading to high wear and tear on fan parts and components. If these fans are configured for intermittent operation and activated when flammable or toxic vapor concentrations are high, there is a significant risk to workers entering the factory building and activating the fans. Utility Model Content

[0004] In response to the above problems, the utility model provides a side wall exhaust fan with interlocked start and stop function in a hazardous chemical production plant, which has the characteristics of real-time monitoring and early warning, and automatic start and stop. It is used to solve the problems of excessive power consumption of the exhaust fan during long-term operation, high loss of fan materials and accessories, intermittent operation when the side wall exhaust fan is started when the concentration of flammable or toxic gas in the plant is high, and high risk of operators entering the plant to start the side wall exhaust fan.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows:

[0006] A side wall exhaust fan with interlocked start and stop for a hazardous chemical production plant, characterized by: a hazardous chemical production device, a fixed gas detector, a side wall exhaust fan, and a PLC controller. The fixed gas detector is installed at the hazardous chemical production device in the hazardous chemical plant, and the side wall exhaust fan is set on the wall of the hazardous chemical plant. The signal output end of the fixed gas detector is connected to the PLC controller, and the PLC controller is connected to the start and stop controller of the side wall exhaust fan.

[0007] The device also includes an audible and visual alarm light, which is connected to the output end of the PLC controller.

[0008] The output end of the PLC controller is connected to the central control computer.

[0009] The beneficial effects of the utility model are:

[0010] (1) When the utility model is in use, when the value displayed by the fixed gas detector is greater than 0, the side wall exhaust fan automatically starts, and the operating status of the side wall exhaust fan can be displayed on the central control computer. When the value of the fixed gas detector is less than 0, the side wall exhaust fan automatically stops after continuing to run for 5 minutes, so that the gas quality in the hazardous chemical plant can be monitored in real time and handled in a timely manner.

[0011] (2) When the utility model is used, when the side wall exhaust fan automatically starts, the sound and light alarm light in the central control room displays and emits an alarm prompt sound, the single side wall exhaust fan automatically stops, and the sound and light alarm light stops the alarm. The sound and light alarm light can promptly report the gas quality status in the hazardous chemical factory and provide a safe maintenance environment.

[0012] (3) When the utility model is in use, the central control computer displays the fixed gas detector value and the exhaust fan start and stop status in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the present utility model.

[0014] Figure numerals: hazardous chemicals factory 1, hazardous chemicals production equipment 2, fixed gas detector 3, side wall exhaust fan 4, central control computer 5, sound and light alarm lights 6, PLC controller 7. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] like Figure 1 As shown, a side wall exhaust fan with interlocked start and stop for a hazardous chemical production plant is characterized by: a hazardous chemical production device 2, a fixed gas detector 3, a side wall exhaust fan 4, and a PLC controller 7. The fixed gas detector 3 is installed at the hazardous chemical production device 2 in the hazardous chemical plant 1, and the side wall exhaust fan 4 is arranged on the wall of the hazardous chemical plant 1. The signal output end of the fixed gas detector 3 is connected to the PLC controller 7, and the PLC controller 7 is connected to the start and stop controller of the side wall exhaust fan 4.

[0017] like Figure 1 As shown, the sound and light alarm lamp 6 is connected to the output end of the PLC controller 7.

[0018] like Figure 1As shown, the output end of the PLC controller 7 is connected to the central control computer 5.

[0019] When the present invention is used, the installation location of the fixed gas detector 3 should be selected near the valve, pipe interface, air outlet or leak-prone part of the hazardous chemical production device 2. When the fixed gas detector 3 detects combustible gas or toxic gas with a specific gravity greater than that of air (such as benzene, methane), its installation height should be 0.3-0.6m from the ground (or floor); when detecting combustible gas or toxic gas with a specific gravity less than that of air (such as carbon monoxide, ammonia, hydrogen), its installation height should be 0.5-2m higher than the release source. When installing the fixed gas detector 3, the probe should be facing downward to avoid blockage caused by dust or mucus. The side wall exhaust fan 4 is connected to the fixed gas detector 3 through the Through the PLC controller 7 and the central control computer 5 interlocking, when the fixed gas detector 3 displays a value greater than 0, the PLC controller 7 controls the side wall exhaust fan 4 to start automatically, and at the same time the sound and light alarm light 5 in the central control room displays and issues an alarm prompt sound. When the value of the fixed gas detector 3 is less than 0, the side wall exhaust fan 4 will automatically stop after continuing to run for 5 minutes, the sound and light alarm light 5 will stop the alarm, and the central control computer 5 will display the fixed gas detector value and the exhaust fan start and stop status in real time. Through the above automatic control, the automatic start and stop of the side wall exhaust fan 4 can be realized, reducing the risk of leakage in the production process of hazardous chemicals, reducing energy consumption, and reducing the risk of operators entering the factory to turn on the side wall exhaust fan.

[0020] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A side wall exhaust fan for hazardous chemicals production plant with interlocked start and stop, characterized by: A hazardous chemical production device (2), a fixed gas detector (3), a side wall exhaust fan (4), and a PLC controller (7), wherein the fixed gas detector (3) is installed at the hazardous chemical production device (2) in a hazardous chemical plant (1), the side wall exhaust fan (4) is arranged on the wall of the hazardous chemical plant (1), the signal output end of the fixed gas detector (3) is connected to the PLC controller (7), and the PLC controller (7) is connected to the start / stop controller of the side wall exhaust fan (4).

2. The interlocked start-stop exhaust fan for hazardous chemicals production plants according to claim 1, characterized in that: It also includes an audible and visual alarm lamp (6), which is connected to the output end of the PLC controller (7).

3. The interlocked start-stop exhaust fan for hazardous chemicals production plants according to claim 1 is characterized by: The output end of the PLC controller (7) is connected to the central control computer (5).

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