Beam-pumping unit fire disaster temperature control automatic sand blasting fire extinguishing device and method

Abstract

A compressed gas storage tank, a sand screening device and a fire extinguishing sandbox connected with the sand screening device are arranged, a three-way pipeline is arranged on the compressed gas storage tank, and the far end, connected with the fire extinguishing sandbox, of a first port of the three-way pipeline is connected with a fan-shaped nozzle with a fourth electromagnetic valve; the first port is correspondingly provided with a second electromagnetic valve and a temperature sensor mounted at the wellhead, and when the temperature sensor senses that the wellhead temperature is higher than the alarm temperature, a signal is transmitted to the temperature control center; the temperature control center controls to open electromagnetic valves mounted at a compressed gas storage tank, a sand falling opening of the fire extinguishing sand box and a fan-shaped nozzle according to the fire temperature grade, so that gas drives fire extinguishing sand through a pipeline, and the compressed gas is sprayed to a fire position of a wellhead in an accelerated manner through the pipeline; and a plurality of sand boxes can be arranged in different directions of the wellhead according to actual conditions to enhance the fire extinguishing effect, and the sand blasting fire extinguishing effect can be achieved according to fire disasters with different disaster degrees.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield fire safety and emergency rescue, and in particular relates to a temperature-controlled automatic sand-spraying fire extinguishing device and method for a beam pumping unit fire. Background Art

[0002] Wellhead fires are the primary type of fire occurring on beam pumping units in oil production lines. Therefore, real-time monitoring of wellhead temperature and timely extinguishing of wellhead oil and gas fires are crucial for effectively handling oilfield fire safety incidents, reducing waste of oil and gas resources, preventing loss of life and property, and ensuring safe production. Considering the numerous fire types, oilfield wellhead oil and gas fires are currently extinguished using water or foam fire extinguishing agents. Considering the precious water resources found in and around desert oilfields, sand is also a readily available and abundant material for extinguishing oil and gas fires. However, there is currently no firefighting equipment or method that utilizes sand resources to extinguish oil and gas fires in oilfields.

[0003] In order to achieve better fire extinguishing effect, it is necessary to use airflow screening method to screen the sand particle size, and store the fire extinguishing sand obtained after screening in a sandbox for preservation.

[0004] Therefore, it is urgent to develop a temperature-controlled automatic sandblasting fire extinguishing equipment and method for the wellhead of a beam pumping unit in an oil field in a desert environment, so as to monitor and extinguish small-scale fires at the wellhead in real time, so as to make up for the deficiency of sandblasting fire extinguishing equipment in the desert environment. Summary of the Invention

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and to provide a temperature-controlled automatic sandblasting fire extinguishing device and method for beam pumping unit fires, thereby achieving real-time monitoring and timely extinguishing of small-scale fires at oilfield wellheads.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A temperature-controlled automatic sandblasting fire extinguishing device for a beam pumping unit fire, comprising a compressed gas storage tank, a sand screening device, and a fire extinguishing sand box connected thereto. The compressed gas storage tank is provided with a three-way pipe, the first port of which is connected to the fire extinguishing sand box, and the far end thereof is connected to a fan-shaped nozzle with a fourth solenoid valve, and the first port is also provided with a second solenoid valve. The lower end of the fire extinguishing sand box is also provided with a sand dropout port and a third solenoid valve. The sand dropout port is also connected to a T-shaped pipe, one end of which is connected to the first port of the compressed gas storage tank, and the other end is a sand blasting outlet connected to a fan-shaped nozzle, and the fan-shaped nozzle is arranged at the wellhead position; The fourth solenoid valve and the third solenoid valve are connected to the temperature control system to monitor the wellhead temperature in real time and control the opening and closing through the provided solenoid valves; The second port is connected to the natural sand box and a first solenoid valve is arranged between the two. The other end of the natural sand box is connected to the feed port of the sand screening device, and the discharge port of the sand screening device is connected to the sand feeding port of the fire extinguishing sand box through a pipeline. The fire extinguishing sand box is also equipped with a pressure-sensitive sensor and controls the sand screening device to automatically add sand through a control system.

[0007] The sand screening device includes an airflow screen, a grading chamber, and an airflow screen feed port, an airflow screen discharge port, and an airflow screen waste outlet provided on the airflow screen, and the airflow screen adopts a horizontal airflow screen; The inlet of the airflow screen is connected to the natural sand box, and the outlet of the airflow screen is connected to the sand feeding port of the fire extinguishing sand box; The natural sand entering through the air flow screen feed port is sprayed into the grading chamber under the action of the air flow provided by the compressed gas storage tank and the built-in wind wheel, while the sand waste with larger particle size is discharged through the air flow screen waste outlet.

[0008] The compressed gas storage tank is connected to a pipeline and is connected to a natural sand box. A conveyor belt for conveying sand is provided in the natural sand box, and the other end of the natural sand box is connected to the feed inlet of the sand screening device.

[0009] The fire extinguishing sand box is also provided with a stirring system, and the stirring system is controlled by an external electric control system; The fire extinguishing sandbox is also equipped with an exhaust observation port for negative pressure exhaust.

[0010] The stirring system includes a rotating motor and a reamer connected thereto, and the rotating motor is control-connected to an external electric control system.

[0011] A fire extinguishing method for a beam pumping unit fire with a temperature-controlled automatic sandblasting fire extinguishing device comprises the following steps: (1) Connection of temperature-controlled automatic sandblasting fire extinguishing equipment First, the compressed gas in the air compressor is pressure-treated and then transported through a pipeline to a compressed air storage tank and stored. The compressed gas storage tank is connected to a natural sand box through a pipeline. The natural sand box is connected to the feed port of the sand screening device through a pipeline, and its discharge port is connected to the sand filling port of the fire extinguishing sand box. The sand dropout port is connected to the first port of the compressed gas storage tank through a T-shaped pipe at one end, and the other end is a sand blasting outlet; (2) Preparation of fire extinguishing sand Use a horizontal airflow screen to screen the natural sand into particles, and select fire extinguishing sand with a particle size range of 0.3 to 2.5 mm; The sand enters the feed port of the air flow screen through the natural sand box and is driven by compressed air and then rotated and sprayed into the grading chamber; The fire extinguishing sand with smaller particle size is carried by the airflow to the outlet of the airflow screen at the bottom, and the sand waste with larger particle size is discharged through the waste outlet of the airflow screen; (3) Structural setting of fire extinguishing sandbox The feed port above the fire extinguishing sand box is connected to the air flow screen outlet through a pipe, and the exhaust observation port provided on the fire extinguishing sand box maintains negative pressure ventilation; The stirring system in the fire extinguishing sand box is controlled by an external electronic control system, and when the pressure sensor senses that the weight of the fire extinguishing sand is lower than the set value, the sand box is replenished with sand. (4) Temperature control system controls the solenoid valve The temperature control system installed at the wellhead monitors the temperature in real time and transmits it to the temperature controller. The temperature controller converts the signal from the temperature sensor into an electrical signal and transmits it to the second solenoid valve, the third solenoid valve and the fourth solenoid valve, and controls the opening size and the injection range of the fan nozzle accordingly.

[0012] The temperature control system sets three temperature gradient levels according to the wellhead flame temperature, and sets T1=500℃ as the ignition temperature, T2=800℃ as the second-level fire temperature, T3=1200℃ as the third-level fire temperature, and T4=1500℃ as the fourth-level flame temperature.

[0013] The temperature control system is set to stepless change according to the wellhead flame temperature.

[0014] The beneficial effects of the present invention are: (1) The present invention discloses a temperature-controlled automatic sandblasting fire extinguishing device and method for a walking beam pumping unit fire. The device comprises a compressed gas storage tank, a sand screening device and a fire extinguishing sand box connected thereto. A three-way pipe is provided on the compressed gas storage tank and a first port thereof is connected to a fan-shaped nozzle with a fourth electromagnetic valve at the far end of the fire extinguishing sand box. A second electromagnetic valve and a temperature sensor installed at the wellhead are also provided at the first port. When the temperature sensor senses that the wellhead temperature is greater than the alarm temperature, the signal is transmitted to the temperature control center. The temperature control center controls the opening of the corresponding electromagnetic valves installed at the compressed gas storage tank, the sand outlet of the fire extinguishing sand box and the fan-shaped nozzle according to the fire temperature level. The gas is driven through the pipe to drive the fire extinguishing sand falling from the fire extinguishing sand box, and the compressed gas in the pipe is accelerated to spray toward the fire position at the wellhead. The sand box can be arranged in multiple locations at different directions of the wellhead according to actual conditions to enhance the fire extinguishing effect. The sandblasting fire extinguishing effect can be achieved according to the fire severity.

[0015] (2) The present invention uses sand in the desert environment instead of water or foam fire extinguishing agent to participate in the extinguishing of oil field well fires, saving the oil field spare water resources in the desert environment and making full use of natural sand resources, realizing the transformation of waste into treasure in the oil field well fire extinguishing materials.

[0016] (3) The present invention combines the monitoring and extinguishing of oilfield well fires, ensuring that the fire at the pumping unit wellhead can be discovered and extinguished in the first place, thereby strengthening the protection of the integration of oilfield well fire safety and emergency rescue.

[0017] (4) The present invention comprehensively considers the influence of natural sand particle size on the fire extinguishing effect, adds a sand screening process, and eliminates the negative impact of sand particles with too large or too small particle size on the device and the fire extinguishing effect; and adds ventilation holes and a stirring system to the design of the sand box to prevent the fire extinguishing sand in the sand box from solidifying due to moisture, accumulation and other factors, which affects the fluidity, thereby ensuring that the sand can smoothly enter the pipeline from the sand drop port.

[0018] (5) In the present invention, oil and gas fires of different disaster levels are divided according to temperature. The wellhead temperature sensor can be divided into three levels, and can also be set to stepless conversion to control three different opening and closing degrees of the solenoid valve. As the wellhead temperature continues to rise, the output pressure of the compressed gas storage tank, the opening size of the sand drop port of the fire extinguishing sand box, and the spray range of the fan-shaped nozzle at the far end of the pipeline will all increase to varying degrees, so as to achieve the purpose of sandblasting fire extinguishing according to the fire level. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural diagram of the fire extinguishing sandbox; Figure 3 It is a flow chart of the temperature-controlled automatic sandblasting fire extinguishing device of the present invention. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0021] The present invention provides a temperature-controlled automatic sand-spraying fire extinguishing device and method for a beam pumping unit fire. Figures 1 to 3 shown.

[0022] A temperature-controlled automatic sandblasting fire extinguishing device for a beam pumping unit fire comprises a compressed gas storage tank 2, a sand screening device, and a fire extinguishing sandbox 6 connected thereto. The compressed gas storage tank 2 is provided with a three-way pipe, and its first port is connected to a fan-shaped nozzle with a fourth solenoid valve 3-4 at the far end of the fire extinguishing sandbox, and a second solenoid valve 3-2 is also provided at the first port. The compressed gas storage tank is externally connected to an air compressor 1, and the compressed gas in the air compressor 1 is pressure-treated and transported by a pipeline to be stored in the compressed air storage tank 2.

[0023] The lower end of the fire extinguishing sand box 6 is also provided with a sand dropout port 6-3 and a third solenoid valve 3-3. The sand dropout port 6-3 is also connected to a T-shaped pipe, one end of which is connected to the first port of the compressed gas storage tank 2, and the other end is a sand blasting outlet connected to a fan-shaped nozzle 3-4, and the fan-shaped nozzle 3-4 is arranged at the wellhead position; the fourth solenoid valve 3-4 and the third solenoid valve 3-3 are connected to a temperature control system to monitor the wellhead temperature in real time and control the opening and closing through the provided solenoid valve.

[0024] The second port is connected to the natural sand box 4 and the first solenoid valve 3-1 is arranged between the two. The other end of the natural sand box 4 is connected to the feed port of the sand screening device, and the discharge port of the sand screening device is connected to the sand adding port of the fire extinguishing sand box 6 through a pipeline; the fire extinguishing sand box 6 is also equipped with a pressure sensitive sensor and the sand screening device is controlled by the control system to automatically add sand.

[0025] The sand screening device includes an airflow screen 5, a grading chamber, and an airflow screen feed port 5-1, an airflow screen discharge port 5-2, and an airflow screen waste outlet 5-3 opened on the airflow screen 5, and the airflow screen 5 adopts a horizontal airflow screen 5; the airflow screen feed port 5-1 is connected to the natural sand box 4, and the airflow screen discharge port 5-2 is connected to the sand adding port of the fire extinguishing sand box 6.

[0026] The natural sand entering through the air flow screen feed port 5-1 is sprayed into the classification chamber under the action of the air flow provided by the compressed gas storage tank 2 and the built-in wind wheel, while the sand waste with larger particle size is discharged through the air flow screen waste outlet 5-3.

[0027] The compressed gas storage tank 2 is connected to a pipeline and is connected to a natural sand box 4. A conveyor belt 4-1 for conveying sand is provided in the natural sand box 4, and the other end of the natural sand box 4 is connected to the feed port of the sand screening device.

[0028] The fire extinguishing sand box 6 is further provided with a stirring system 6-4, and the stirring system 6-4 is controlled by an external electric control system; and the fire extinguishing sand box 6 is further provided with an exhaust observation port 6-2 for negative pressure exhaust.

[0029] In this embodiment, the stirring system 6 - 4 includes a rotating motor and a reamer connected thereto, and the rotating motor is control-connected to an external electric control system.

[0030] A fire extinguishing method for a beam pumping unit fire using a temperature-controlled automatic sandblasting fire extinguishing device, characterized by comprising the following steps: (1) Connection of temperature-controlled automatic sandblasting fire extinguishing equipment First, the compressed gas in the air compressor 1 is pressure-treated and then transported through a pipeline to the compressed air storage tank 2 and stored. The compressed gas storage tank 2 is connected to the natural sand box 4 through a pipeline. The natural sand box 4 is connected to the feed port of the sand screening device through a pipeline, and its discharge port is connected to the sand feeding port 6-1 of the fire extinguishing sand box 6; One end of the sand dropout port 6 - 3 is connected to the first port of the compressed gas storage tank 2 through a T-shaped pipe, and the other end is a sand blasting outlet connected to the fan-shaped nozzle 8 .

[0031] (2) Preparation of fire extinguishing sand Use horizontal airflow screen 5 to screen the natural sand into particles, and select fire extinguishing sand with a particle size range of 0.3 to 2.5 mm; The sand enters the air flow screen feed port 5-1 through the natural sand box 4 and is driven by compressed air and then rotates and sprayed into the grading chamber; The fire-extinguishing sand with smaller particle size is carried by the airflow to the airflow screen outlet 5-2 at the bottom, and the sand waste with larger particle size is discharged through the airflow screen waste outlet 5-3.

[0032] (3) Structural setting of fire extinguishing sandbox The feed port 6-1 above the fire extinguishing sand box 6 is connected to the air flow screen discharge port 5-2 through a pipe, and the exhaust observation port 6-2 provided on the fire extinguishing sand box 6 maintains negative pressure ventilation; The stirring system in the fire extinguishing sand box 6 is controlled by an external electric control system, and when the pressure sensitive sensor 6-7 senses that the weight of the fire extinguishing sand is lower than the set value, the natural sand box 4 is started to replenish sand.

[0033] (4) Temperature control system controls the solenoid valve The temperature control system installed at the wellhead monitors in real time and transmits the signal to the temperature controller. The temperature controller converts the signal from the temperature sensor into an electrical signal and transmits it to the second solenoid valve 3-2, the third solenoid valve 3-3 and the fourth solenoid valve 3-4, and controls the opening size and the injection range of the fan nozzle 8 accordingly.

[0034] The temperature control system sets multiple temperature gradient levels according to the wellhead flame temperature, and sets T1=500℃ as the ignition temperature, T2=800℃ as the second-level fire temperature, T3=1200℃ as the third-level fire temperature, and T4=1500℃ as the fourth-level flame temperature.

[0035] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1-3 As shown, the present invention provides a fire extinguishing method for beam-type pumping unit wellhead automatic temperature control sandblasting fire extinguishing equipment, comprising the following steps: S1. Connection of automatic temperature-controlled sandblasting fire extinguishing equipment: The structural connection diagram of the preparation device is as follows Figure 1As shown, the compressed gas in the air compressor 1 is transported by a pipeline after pressure treatment and stored in a compressed air storage tank 2. The compressed gas storage tank is connected to a natural sand box 4 through a pipeline. The natural sand box 4 is connected to the feed port 5-1 above the horizontal air flow screen 5 through a pipeline. Its discharge port 5-2 is connected to the sand inlet 6-1 above the fire extinguishing sand box 6. Its sand drop port 6-3 is connected to the high-pressure airflow output port of the compressed gas storage tank through a T-shaped pipe at one end, and the other end is a sand blasting outlet.

[0037] The setting of the solenoid valves in this automatic temperature-controlled sandblasting fire extinguishing device: 3-1 The solenoid valve at the compressed gas storage tank and the natural sand box is installed at the end of the compressed gas storage tank and the pipe connecting the natural sand box close to the gas tank; 3-2 The solenoid valve at the compressed gas storage tank output is installed at the end of the compressed gas storage tank and the pipe connecting the fire extinguishing sand box close to the gas tank; 3-3 The solenoid valve at the sand falling opening of the fire extinguishing sand box is installed at the junction of the sand falling opening of the fire extinguishing sand box and the pipe; 3-4 The solenoid valve at the fan-shaped nozzle is installed on the fan-shaped nozzle at the outlet of the far-end sandblasting pipe.

[0038] S2. Preparation of fire extinguishing sand: The fire-fighting sand used in the automatic temperature-controlled sandblasting fire extinguisher is primarily derived from screened natural sand. The preparation method utilizes an airflow screening method, which primarily consists of an airflow screen and an air source. Given the particle size range of fire-fighting sand, which ranges from 0.3 to 2.5 mm, a horizontal airflow screen 5 is used to screen the natural sand. The horizontal airflow screen 5 comprises a feed port 5-1, a grading chamber, a discharge port 5-2, and a waste port 5-3. The sand enters the feed port 5-1 via a conveyor belt 4-1 and compressed air in the natural sand bin 4. The sand is then evenly sprayed into the grading chamber through a rotating pipe. The airflow in the grading chamber is provided by a compressed gas storage tank 2 and an integrated impeller. The airflow is injected into the grading chamber through the feed port, carrying the natural sand upwards. Gravity then causes the sand to fall, ultimately separating the larger sand particles. The fire extinguishing sand with smaller particle size is carried by the air flow to the lower discharge port 5-2, which is connected to the upper feed port 6-1 of the fire extinguishing sand box.

[0039] S3. Sandbox structure: A feed inlet 6-1 is provided above the fire extinguishing sand box 6, which is connected to the discharge port 5-2 of the air flow screen through a pipe, and the exhaust observation port 6-2 maintains negative pressure ventilation to extract the humid air that may exist in the fire extinguishing sand box 6 to prevent the sand from solidifying due to moisture and affecting its fluidity. A rotating motor is provided inside the fire extinguishing sand box 6 and is connected to a reamer. The rotating motor is powered by an external power supply 6-5 to form a stirring system 6-4 in the fire extinguishing sand box. The start of the external power supply is automatically controlled by the temperature control system in S1. The setting of the stirring system 6-4 is also to prevent the sand from solidifying and enhance its fluidity. A pressure-sensitive sensor 6-7 is provided at the bottom of the fire extinguishing sand box 6. When it senses that the weight of the fire extinguishing sand is less than a certain level, it will send a signal to start the conveyor belt 4-1 and the air flow screen 5 in the natural sand box 4 to prepare and replenish the fire extinguishing sand. A sand drop port 6-3 is provided at the bottom of the fire extinguishing sand box, which is connected to the outlet pipe of the compressed gas storage tank through a pipe.

[0040] S4. Temperature control system controls the solenoid valve A temperature sensor 9, mounted at the wellhead 10, senses temperature signals in real time and transmits them to a temperature controller. The temperature controller converts the sensor signal into an electrical signal with three levels (or can be configured for stepless conversion), which is then transmitted to a relay. The relay, based on the three different electrical signals, controls the opening and closing of the second solenoid valve 3-2 at the compressed gas storage tank output, the third solenoid valve 3-3 at the sandbox opening, and the fourth solenoid valve 3-4 at the fan-shaped nozzle. Furthermore, three temperature gradient levels are set based on the flame temperature range of oil and gas fires: T1 = 500°C for the ignition temperature, T2 = 800°C for the second level, T3 = 1200°C for the third level, and T4 = 1500°C for the fourth level. As the wellhead temperature rises, the compressed gas storage tank's output pressure, the sandbox opening size, and the fan-shaped nozzle's spray range at the far end of the pipeline all increase to varying degrees, achieving sandblasting firefighting capabilities tailored to the severity of the fire.

[0041] Working principle: When the temperature sensor installed at the wellhead of the walking beam pumping unit senses that the wellhead temperature is greater than the set alarm temperature, it transmits the signal to the temperature control center. The temperature control center controls the opening of the corresponding solenoid valves installed at the compressed gas storage tank, the sand dropout port of the fire extinguishing sand box and the fan-shaped nozzle according to the fire temperature level, so that the gas drives the fire extinguishing sand falling from the fire extinguishing sand box through the pipeline, and the compressed gas in the pipeline is accelerated to spray toward the fire location at the wellhead. The sand box can be set in multiple locations at different directions of the wellhead according to actual conditions to enhance the fire extinguishing effect.

[0042] The opening and closing of the power supply of the stirring device is connected in series with the third solenoid valve at the sand outlet of the fire extinguishing sand box. When the third solenoid valve 3-3 at the sand outlet of the fire extinguishing sand box is energized, the power supply of the stirring device in series is powered to start stirring the sand in the fire extinguishing sand box to prevent it from solidifying due to moisture, accumulation, etc.; the pressure-sensitive sensor controls the power supply of the first solenoid valve at the pipeline between the compressed gas storage tank and the natural sand box, the conveyor belt in the natural sand box and the bedroom air flow screen through signals, thereby realizing the opening and closing of the solenoid valve and the opening of the conveyor belt and the air flow valve.

[0043] If the terms "first" and "second" are used in this patent to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of describing the present invention and simplifying the description, and the above terms have no special meaning.

[0044] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications are possible without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the claimed invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0045] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "center", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the protection content of the present invention.

Claims

1. A temperature-controlled automatic sandblasting fire extinguishing device for a beam pumping unit fire, characterized by: It includes a compressed gas storage tank, a sand screening device and a fire extinguishing sand box connected thereto. The compressed gas storage tank is equipped with a three-way pipe, and its first port is connected to the fan-shaped nozzle with a fourth solenoid valve at the far end of the fire extinguishing sand box, and the first port is also correspondingly equipped with a second solenoid valve. The lower end of the fire extinguishing sand box is also provided with a sand dropout port and a third solenoid valve. The sand dropout port is also connected to a T-shaped pipe, one end of which is connected to the first port of the compressed gas storage tank, and the other end is a sand blasting outlet connected to a fan-shaped nozzle, and the fan-shaped nozzle is arranged at the wellhead position; The fourth solenoid valve and the third solenoid valve are connected to the temperature control system to monitor the wellhead temperature in real time and control the opening and closing through the provided solenoid valves; The second port is connected to the natural sand box and a first solenoid valve is arranged between the two. The other end of the natural sand box is connected to the feed port of the sand screening device, and the discharge port of the sand screening device is connected to the sand feeding port of the fire extinguishing sand box through a pipeline. The fire extinguishing sand box is also equipped with a pressure-sensitive sensor and controls the sand screening device to automatically add sand through a control system.

2. The temperature-controlled automatic sandblasting fire extinguishing device for a beam pumping unit fire according to claim 1, characterized in that: The sand screening device includes an airflow screen, a grading chamber, and an airflow screen feed port, an airflow screen discharge port, and an airflow screen waste outlet provided on the airflow screen, and the airflow screen adopts a horizontal airflow screen; The inlet of the airflow screen is connected to the natural sand box, and the outlet of the airflow screen is connected to the sand feeding port of the fire extinguishing sand box; The natural sand entering through the air flow screen feed port is sprayed into the grading chamber under the action of the air flow provided by the compressed gas storage tank and the built-in wind wheel, while the sand waste with larger particle size is discharged through the air flow screen waste outlet.

3. The temperature-controlled automatic sandblasting fire extinguishing device for a beam pumping unit fire according to claim 2, characterized in that: The compressed gas storage tank is connected to a pipeline and is connected to a natural sand box. A conveyor belt for conveying sand is provided in the natural sand box, and the other end of the natural sand box is connected to the feed inlet of the sand screening device.

4. The temperature-controlled automatic sandblasting fire extinguishing device for a beam pumping unit fire according to claim 2, characterized in that: The fire extinguishing sand box is also provided with a stirring system, and the stirring system is controlled by an external electric control system; The fire extinguishing sandbox is also equipped with an exhaust observation port for negative pressure exhaust.

5. The temperature-controlled automatic sand-spraying fire extinguishing device for a beam pumping unit fire according to claim 4, characterized in that: The stirring system includes a rotating motor and a reamer connected thereto, and the rotating motor is control-connected to an external electric control system.

6. A fire extinguishing method based on a temperature-controlled automatic sandblasting fire extinguishing device for a beam pumping unit fire according to any one of claims 2 to 5, characterized in that: The following steps are involved: (1) Connection of temperature-controlled automatic sandblasting fire extinguishing equipment First, the compressed gas in the air compressor is pressure-treated and then transported through a pipeline to a compressed air storage tank and stored. The compressed gas storage tank is connected to a natural sand box through a pipeline. The natural sand box is connected to the feed port of the sand screening device through a pipeline, and its discharge port is connected to the sand filling port of the fire extinguishing sand box. The sand dropout port is connected to the first port of the compressed gas storage tank through a T-shaped pipe at one end, and the other end is a sand blasting outlet; (2) Preparation of fire extinguishing sand Use a horizontal airflow screen to screen the natural sand into particles, and select fire extinguishing sand with a particle size range of 0.3 to 2.5 mm; The sand enters the feed port of the air flow screen through the natural sand box and is driven by compressed air and then rotated and sprayed into the grading chamber; The fire extinguishing sand with smaller particle size is carried by the airflow to the outlet of the airflow screen at the bottom, and the sand waste with larger particle size is discharged through the waste outlet of the airflow screen; (3) Structural setting of fire extinguishing sandbox The feed port above the fire extinguishing sand box is connected to the air flow screen outlet through a pipe, and the exhaust observation port provided on the fire extinguishing sand box maintains negative pressure ventilation; The stirring system in the fire extinguishing sand box is controlled by an external electronic control system, and when the pressure sensor senses that the weight of the fire extinguishing sand is lower than the set value, the sand box is replenished with sand. (4) Temperature control system controls the solenoid valve The temperature control system installed at the wellhead monitors the temperature in real time and transmits it to the temperature controller. The temperature controller converts the signal from the temperature sensor into an electrical signal and transmits it to the second solenoid valve, the third solenoid valve and the fourth solenoid valve, and controls the opening size and the injection range of the fan nozzle accordingly.

7. The fire extinguishing method of a beam pumping unit fire temperature-controlled automatic sandblasting fire extinguishing device according to claim 6, characterized in that: The temperature control system sets three temperature gradient levels according to the wellhead flame temperature, and sets T1=500℃ as the ignition temperature, T2=800℃ as the second-level fire temperature, T3=1200℃ as the third-level fire temperature, and T4=1500℃ as the fourth-level flame temperature.

8. The fire extinguishing method of a beam pumping unit fire temperature-controlled automatic sandblasting fire extinguishing device according to claim 6, characterized in that: The temperature control system is set to stepless change according to the wellhead flame temperature.

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