Automatic filling and discharging execution device for thin oil sealed gas holder

Abstract

The invention relates to an automatic filling and discharging execution device for a thin oil sealed gas holder, which comprises a main electric adjusting type butterfly valve, an auxiliary electric adjusting type butterfly valve I, an auxiliary electric adjusting type butterfly valve II, a valve connecting pipeline, a thin oil sealed gas holder, a gas holder gas pressure sensor, a gas holder front gas pipeline, a gas pressure sensor, a blast furnace gas main pipeline and a PLC (Programmable Logic Controller) control system, a valve control circuit, a low-voltage power distribution cabinet, a valve power circuit and a pressure sensor signal circuit. According to the device, an electric adjusting butterfly valve is arranged on an inlet pipeline (an inlet pipeline and an outlet pipeline are the same pipeline) of the thin oil sealed gas holder, two small electric adjusting butterfly valves are respectively arranged on two sides of the adjusting butterfly valve to form an adjusting valve group, and the opening degree of the valve is adjusted according to a preset control logic according to the position of the gas holder and the pressure of a main pipe. And automatic filling or discharging of the gas holder is realized. The device is simple in structure, automatic gas holder filling and discharging effects are achieved, and it is ensured that the pressure of a gas pipe network is controlled within the required reasonable pressure range.

Description

Technical Field

[0001] This patent application belongs to the technical field of gas holder control equipment, and more specifically, relates to an automatic filling and discharging cabinet execution device for a thin oil sealed gas holder. Background Art

[0002] Leak-oil sealed gasholders, a type of dry gasholder, are widely used in energy recovery and utilization within the steel industry. Leak-oil sealed gasholders are categorized into polygonal and cylindrical types. These types feature high storage pressure, stable operation, and a large gas storage capacity. They are connected to the blast furnace gas main pipeline. When gas is abundant, it is stored in the gasholder, reducing pipeline pressure. When gas is insufficient and pipeline pressure drops, it is replenished to increase pressure. Based on various factors, including the gas pressure requirements of steel mill users and the stable and safe operation of blast furnace gasholders, the blast furnace gas main pressure is stabilized within the 9-12 kPa range to meet user pressure requirements. Operators monitor pressure fluctuations and follow instructions from the production dispatch desk to control the filling and discharge of the gasholder by adjusting the opening of the inlet butterfly valve.

[0003] After screening and analyzing the data, staff discovered that pressure exceeded the standard 32 times in just one month. These large pressure fluctuations significantly impacted user production and threatened the normal operation of blast furnace hot blast stoves and gas-fired power generation. During the operation of the pressure charging and discharging cabinets in the blast furnace gas balancing network, manual adjustments to the opening of the inlet and outlet valves experienced a lag. After the valves reached a certain opening, subsequent tracking and feedback were discontinuous, causing secondary fluctuations in the network pressure, resulting in suboptimal adjustments and high labor intensity for operators. The varying operational proficiency and predictive abilities of the operators also contributed to the fluctuations in the blast furnace gas network pressure. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an automatic filling and discharging actuator for a thin oil sealed gas tank. This actuator can automatically adjust the number of valve openings, the opening ratio, and the opening speed according to the setting requirements and changes of the blast furnace gas main network pressure, control the gas flow of filling or discharging the gas tank, and achieve the effect of accurately balancing the blast furnace gas network pressure.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is: A thin oil sealed gas holder automatic filling and discharging cabinet execution device is arranged on the gas pipeline in front of the thin oil sealed gas holder, comprising a valve group installed on the main pipeline in front of the cabinet, a low-voltage power distribution cabinet electrically connected to the valve group, a PLC control system connected to the valve group, a gas pressure sensor and a gas holder gas pressure sensor connected to the PLC control system, a thin oil sealed gas holder connected to the gas holder gas pressure sensor, the gas holder gas pressure sensor being installed on the gas holder wall panel, the gas pressure sensor being located on the blast furnace gas main pipeline (9), and the blast furnace gas main pipeline being connected to the gas pipe in front of the gas holder; The valve group includes a main electric regulating butterfly valve, an auxiliary electric regulating butterfly valve 1 and an auxiliary electric regulating butterfly valve 2. The main electric regulating butterfly valve is installed on the main pipeline in front of the cabinet. The main electric regulating butterfly valve is connected to the gas pipeline in front of the gas tank and the thin oil sealed gas tank. The auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are installed on the bypass gas pipelines on the left and right sides of the main electric regulating butterfly valve to serve as bypasses for the main electric regulating butterfly valve.

[0006] Furthermore, the PLC control system is connected to the gas pressure sensor and the gas tank gas pressure sensor through the pressure sensor signal line; the PLC control system is connected to the valve group through the valve control line; and the low-voltage distribution cabinet is connected to the valve group through the valve power line.

[0007] Furthermore, auxiliary electric regulating butterfly valves 1 and 2 are installed on either side of the main electric regulating butterfly valve via valve connecting pipes. The valve diameters of these valves are 40% of the valve diameter of the main electric regulating butterfly valve. The main, auxiliary, and auxiliary electric regulating butterfly valves can be automatically controlled in their openings based on signals fed back by a gas pressure sensor on the blast furnace gas main pipeline via a PLC control program.

[0008] Further, the use process of this device is as follows: S1: The gas pressure in the blast furnace gas main pipeline is higher than the pressure inside the oil-sealed gas tank. The program controls the opening of the main electric regulating butterfly valve, auxiliary electric regulating butterfly valve 1, and auxiliary electric regulating butterfly valve 2. The opening speed is controlled by the set proportional parameters. At this time, the pipeline valve in front of the tank opens, the oil-sealed gas tank is filled, the gas reserve in the tank increases, and the gas pressure in the blast furnace gas main pipeline decreases. When the gas pressure in the blast furnace gas main pipeline is lower than the pressure inside the oil-sealed gas holder, the program controls the opening of the main electric regulating butterfly valve, auxiliary electric regulating butterfly valve 1, and auxiliary electric regulating butterfly valve 2. The opening speed is controlled by the set proportional parameters. At this time, the pipeline valve in front of the cabinet opens, the oil-sealed gas holder is discharged, the gas reserve in the cabinet decreases, and the gas pressure in the blast furnace gas main pipeline increases. S2, the PLC control system controls the valve opening and the gas filling and exhaust volume of the oil-sealed gas holder according to the detected blast furnace gas main pipeline pressure and the preset control program, thereby stabilizing the blast furnace gas main network within the required pressure range; S3. Set the four main pressure values of blast furnace gas, HH (high-high), H (high), LL (low-low), and L (low), in advance in the control program of the PLC control system. When the automatic filling and discharging cabinet program is put into operation, the main electric regulating butterfly valve automatically opens to 15%, and the auxiliary electric regulating butterfly valves 1 and 2 simultaneously open to 30%. This is the initial state of the three valves in the valve group after the automatic filling and discharging cabinet is put into operation. During the automatic adjustment period, the main electric regulating butterfly valve remains unchanged at 15% and can be adjusted manually. At the same time, set the upper and lower limit ranges of the cabinet positions allowed for the automatic filling and discharging cabinet program of the gas cabinet in advance in the control program of the PLC control system. S4. When the main pipe pressure of blast furnace gas is lower than L, the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are fine-tuned based on the existing opening (the valve is controlled to open 0.1% of the opening every 0.5 seconds), and the valve action speed is adjusted according to the set proportional parameter until the main pipe pressure is adjusted to L; S5. When the main pressure of blast furnace gas is lower than LL, the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are adjusted simultaneously and quickly, with the opening of 10% each time (the valve adjustment starts and stops as one time). After each adjustment of 10%, there is a pause of 1 second to determine whether the pressure reaches above LL. If it does not reach LL, it continues to open until the opening of the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 reaches 90%; if it reaches LL, the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are fine-tuned based on the existing opening (the valve is controlled to open 0.1% every 0.5 seconds), and the valve action speed is adjusted according to the set proportional parameter until the pressure is adjusted to L; S6, auxiliary electric regulating butterfly valve 1 and auxiliary electric regulating butterfly valve 2 are not adjusted when the main pipe pressure is within the LH range; S7. When the main pipe pressure of blast furnace gas is higher than H, the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are fine-tuned based on the existing opening, and the valve action speed is adjusted according to the set proportional parameter. The valve is controlled to open 0.1% of the opening every 0.5 seconds until the main pipe pressure is adjusted to H; S8. When the main pipe pressure of blast furnace gas is higher than HH, the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are adjusted simultaneously and quickly, with each adjustment being made by opening 10% (the valve adjustment starts and stops as one time). After each adjustment of 10%, there is a pause of 1 second to determine whether the main pipe pressure reaches or exceeds HH. If it does not reach HH, it continues to be opened until the opening of the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 reaches 90%; if it reaches HH, the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are fine-tuned based on the existing opening, and the valve action speed is adjusted according to the set proportional parameter, and the valve is controlled to open 0.1% every 0.5 seconds until the main pipe pressure is adjusted to H; S9. When the gas tank position of the thin oil sealed gas tank is higher than the upper limit of the gas tank position range allowed by the automatic filling and draining program, or lower than the lower limit of the gas tank position range allowed by the automatic filling and draining program, the PLC control system prompts "Cabinet position exceeded, please switch to manual adjustment". At this time, you need to manually click the "Automatic filling and draining" switch button to switch to manual adjustment; S10. After the prompt "Cabinet position exceeds limit, please switch to manual adjustment", if manual adjustment is not intervened in time, for the safety of the gas holder, the control program of the PLC control system performs program control under different working conditions. When the gas holder position is higher than the set upper limit range of the cabinet position allowed for the automatic filling and discharging program of the gas holder and lower than the set lower limit range of the cabinet position allowed for the automatic filling and discharging program of the gas holder, without switching to the manual intervention adjustment mode, the control program of the PLC control system can continue to control the execution of automatic adjustment, so that the gas holder only discharges the cabinet but does not fill it, and only fills the cabinet but does not discharge it, to ensure the safe cabinet position of the gas holder.

[0009] Furthermore, when the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are fine-tuned, the valve is controlled to adjust the opening by 0.1% every 0.5 seconds; when the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are quickly adjusted, the valve is adjusted at an opening of 10% each time, and there is a pause of 1 second after each adjustment of 10%.

[0010] Furthermore, in S10, specifically refers to: When the gas tank level is higher than the upper limit of the set gas tank level allowed for automatic filling and draining procedures, and the main pipe pressure is higher than the gas tank pressure, the main electric regulating butterfly valve, auxiliary electric regulating butterfly valve 1, and auxiliary electric regulating butterfly valve 2 are automatically controlled to close; when the main pipe pressure is lower than the gas tank pressure, the valves are adjusted to drain the gas tank, so that the gas tank is only drained but not filled; When the gas tank position is lower than the set lower limit range of the gas tank position allowed for automatic filling and discharging procedures, when the main pipe pressure is lower than the gas tank pressure, the main electric regulating butterfly valve, auxiliary electric regulating butterfly valve 1 and auxiliary electric regulating butterfly valve 2 are automatically controlled to close; when the main pipe pressure is higher than the gas tank pressure, the valve is adjusted to fill the tank, so that the gas tank is only filled and not discharged.

[0011] Furthermore, the gas pressure sensor and the gas cabinet gas pressure sensor are both CXT-SK intelligent pressure transmitters, and of course they can also be other models or types.

[0012] Due to the adoption of the above technical solution, the beneficial effects achieved by the present invention are: This device installs an electric regulating butterfly valve on the inlet pipe of the thin oil sealed gas holder (the inlet and outlet pipes are the same pipe), and a small electric regulating butterfly valve is installed on each side of the regulating butterfly valve to form a regulating valve group. The valve opening is adjusted according to the preset control logic based on the gas holder position and main pipe pressure to realize automatic filling or draining of the gas holder.

[0013] The present invention can automatically adjust the opening of three regulating valves under program control according to the pressure of the blast furnace gas main network, control the air intake or exhaust volume of the gas holder, and achieve the effect of balancing the pressure of the blast furnace gas main network, so that the pressure of the blast furnace gas main network can be stably operated within a predetermined range.

[0014] The present invention features a simple structure and automatically charges and discharges gas tanks, ensuring that gas network pressure remains within the required, reasonable range. It is also flexible, convenient, and highly operable, replacing manual automatic control of valve openings. This allows for rapid and timely valve adjustment, significantly improving blast furnace gas network pressure stability and possessing significant application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a connection diagram of the present invention.

[0016] Among them: main electric regulating butterfly valve 1, auxiliary electric regulating butterfly valve 1 2, auxiliary electric regulating butterfly valve 2 3, valve connecting pipeline 4, thin oil sealed gas tank 5, gas tank gas pressure sensor 6, gas tank front gas pipeline 7, gas pressure sensor 8, blast furnace gas main pipeline 9, PLC control system 10, valve control circuit 11, low-voltage distribution cabinet 12, valve power circuit 13, pressure sensor signal circuit 14. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the embodiments.

[0018] An automatic filling and discharging cabinet actuator for a thin oil sealed gas tank, such as Figure 1, is installed on the gas pipeline in front of the thin oil sealed gas holder, including a valve group installed on the main pipeline in front of the cabinet, a low-voltage distribution cabinet 12 electrically connected to the valve group, a PLC control system 10 controlled by the valve group, a gas pressure sensor 8 and a gas holder gas pressure sensor 6 connected to the PLC control system 10, a thin oil sealed gas holder 5 connected to the gas holder gas pressure sensor 6, the gas holder gas pressure sensor 6 is installed on the gas holder wall panel, the gas pressure sensor 8 is located on the blast furnace gas main pipeline 9, and the blast furnace gas main pipeline 9 is connected to the gas pipeline 7 in front of the gas holder.

[0019] Preferably, the gas pressure sensor 8 and the gas cabinet gas pressure sensor 6 are both CXT-SK intelligent pressure transmitters, and may also be sensors of other types or models.

[0020] The valve group includes a main electric regulating butterfly valve 1, an auxiliary electric regulating butterfly valve 1 2, and an auxiliary electric regulating butterfly valve 2 3. The main electric regulating butterfly valve 1 is installed on the main pipeline in front of the cabinet. The main electric regulating butterfly valve 1 is connected to the gas pipeline 7 in front of the gas tank and the thin oil sealed gas tank 5; the auxiliary electric regulating butterfly valve 1 2 and the auxiliary electric regulating butterfly valve 2 3 are installed on the bypass gas pipelines on the left and right sides of the main electric regulating butterfly valve 1 as bypasses of the main electric regulating butterfly valve.

[0021] exist Figure 1 In the figure, the PLC control system 10 is connected to the gas pressure sensor 8 and the gas cabinet gas pressure sensor 6 through the pressure sensor signal line 14; the PLC control system 10 is connected to the valve group through the valve control line 11; the low-voltage distribution cabinet 12 is connected to the valve group through the valve power line 13.

[0022] Auxiliary electric regulating butterfly valves 1 (2) and 2 (3) are installed on the left and right sides of the main electric regulating butterfly valve 1 via valve connection pipes 4. Their valve diameters are 40% of the diameter of the main electric regulating butterfly valve 1. The main, auxiliary, and secondary electric regulating butterfly valves 1 (2) and 2 (3) can automatically control their openings based on signals fed back by gas pressure sensors 8 on the blast furnace gas main pipeline 9 via a PLC control program.

[0023] The specific use process of this thin oil sealed gas cabinet automatic filling and exhaust cabinet actuator is as follows: S1: The gas pressure in the blast furnace gas main pipeline 9 is higher than the pressure inside the oil-sealed gas tank 5. The program controls the opening of the main electric regulating butterfly valve 1, auxiliary electric regulating butterfly valve 1 2, and auxiliary electric regulating butterfly valve 2 3. The opening speed is controlled by the set proportional parameters. At this time, the pipeline valve in front of the tank is opened, the oil-sealed gas tank 5 is filled, the gas reserve in the tank is increased, and the gas pressure in the blast furnace gas main pipeline 9 decreases. The gas pressure in the blast furnace gas main pipeline 9 is lower than the pressure inside the oil-sealed gas tank 5. The program controls the opening of the main electric regulating butterfly valve 1, auxiliary electric regulating butterfly valve 1 2, and auxiliary electric regulating butterfly valve 2 3. The opening speed is controlled by the set proportional parameters. At this time, the pipeline valve in front of the tank opens, the oil-sealed gas tank 5 is discharged, the gas reserve in the tank is reduced, and the gas pressure in the blast furnace gas main pipeline 9 increases. S2, the PLC control system 10 controls the valve opening according to the detected pressure of the blast furnace gas main pipeline 9 and the preset control program, and controls the gas filling and exhaust volume of the oil-sealed gas tank 5, so as to stabilize the blast furnace gas main network within the required pressure range; S3. Set the four blast furnace gas main pressures (HH (high-high), H (high), LL (low-low), and L (low)) in advance in the control program of the PLC control system 10. When the automatic filling and discharging program is put into operation, the main electric regulating butterfly valve 1 automatically opens to 15%, and the auxiliary electric regulating butterfly valves 1 and 2 and 3 simultaneously open to 30%. This is the initial state of the three valves in the valve group after the automatic filling and discharging program is put into operation. During the automatic adjustment period, the main electric regulating butterfly valve 1 remains unchanged at 15%, but can be adjusted manually. At the same time, set the upper and lower limit ranges of the cabinet positions allowed for the automatic filling and discharging program of the gas cabinet in advance in the control program of the PLC control system 10. S4. When the main pipe pressure of blast furnace gas is lower than L, the auxiliary electric regulating butterfly valve 1 2 and the auxiliary electric regulating butterfly valve 2 3 are fine-tuned based on the existing opening. The valve action speed is adjusted according to the set proportional parameter. The valve is controlled to open 0.1% of the opening every 0.5 seconds until the main pipe pressure is adjusted to L. S5. When the main pipe pressure of blast furnace gas is lower than LL, auxiliary electric regulating butterfly valve 1-2 and auxiliary electric regulating butterfly valve 2-3 are adjusted simultaneously and quickly, with the opening of 10% each time (the valve adjustment starts and stops as one time). After each adjustment of 10%, there is a pause of 1 second to determine whether the pressure reaches above LL. If it does not reach LL, it continues to be opened until the opening of auxiliary electric regulating butterfly valve 1-2 and auxiliary electric regulating butterfly valve 2-3 reaches 90%; if it reaches LL, auxiliary electric regulating butterfly valve 1-2 and auxiliary electric regulating butterfly valve 2-3 are fine-tuned based on the existing opening, and the valve action speed is adjusted according to the set proportional parameter, and the valve is controlled to open 0.1% every 0.5 seconds until the pressure is adjusted to L; S6, auxiliary electric regulating butterfly valve 1 2 and auxiliary electric regulating butterfly valve 2 3 are not adjusted when the main pipe pressure is within the LH range; S7. When the main pipe pressure of blast furnace gas is higher than H, the auxiliary electric regulating butterfly valve 1 2 and the auxiliary electric regulating butterfly valve 2 3 are fine-tuned based on the existing opening, and the valve action speed is adjusted according to the set proportional parameter. The valve is controlled to open 0.1% of the opening every 0.5 seconds until the main pipe pressure is adjusted to H; S8. When the main pipe pressure of blast furnace gas is higher than HH, auxiliary electric regulating butterfly valve 1-2 and auxiliary electric regulating butterfly valve 2-3 are adjusted simultaneously and quickly, with each adjustment being made by opening 10% (the valve adjustment starts and stops as one time). After each adjustment of 10%, there is a pause of 1 second to determine whether the main pipe pressure reaches or exceeds HH. If it does not reach HH, it continues to be opened until the opening of auxiliary electric regulating butterfly valve 1-2 and auxiliary electric regulating butterfly valve 2-3 reaches 90%; if it reaches HH, auxiliary electric regulating butterfly valve 1-2 and auxiliary electric regulating butterfly valve 2-3 are fine-tuned based on the existing opening, and the valve action speed is adjusted according to the set proportional parameter, controlling the valve to open 0.1% every 0.5 seconds until the main pipe pressure is adjusted to H; S9: When the gas tank position of the thin oil sealed gas tank 5 is higher than the upper limit of the gas tank position range allowed for the automatic filling and draining program or lower than the lower limit of the gas tank position range allowed for the automatic filling and draining program, the PLC control system 10 prompts "Gas tank position exceeded, please switch to manual adjustment". In this case, you need to manually click the "Automatic filling and draining" switch button to switch to manual adjustment; S10. After the prompt "Cabinet position exceeds limit, please switch to manual adjustment", if manual adjustment is not intervened in time, for the safety of the gas holder, the control program of the PLC control system 10 performs program control under different working conditions. When the gas holder position is higher than the set upper limit range of the cabinet position allowed for the automatic filling and discharging program of the gas holder and lower than the set lower limit range of the cabinet position allowed for the automatic filling and discharging program of the gas holder, without switching to the manual intervention adjustment mode, the control program of the PLC control system 10 can continue to control the execution of automatic adjustment, so that the gas holder only discharges the cabinet but does not fill it, and only fills the cabinet but does not discharge it, to ensure the safe cabinet position of the gas holder.

[0024] In this step: When the gas tank level is higher than the upper limit of the set gas tank level allowed for automatic filling and draining procedures, and the main pipe pressure is higher than the gas tank pressure, the main electric regulating butterfly valve 1, auxiliary electric regulating butterfly valve 1 2, and auxiliary electric regulating butterfly valve 2 3 are automatically closed. When the main pipe pressure is lower than the gas tank pressure, the valves are adjusted to drain the gas tank, so that the gas tank is only drained but not filled. When the gas tank position is lower than the set lower limit range of the gas tank position allowed for automatic filling and discharging procedures, when the main pipe pressure is lower than the gas tank pressure, the main electric regulating butterfly valve 1, auxiliary electric regulating butterfly valve 1 2 and auxiliary electric regulating butterfly valve 2 3 are automatically controlled to close; when the main pipe pressure is higher than the gas tank pressure, the valves are adjusted to fill the tank, so that the gas tank is only filled and not discharged.

[0025] In the corresponding execution details, when the auxiliary electric regulating butterfly valve 1 2 and the auxiliary electric regulating butterfly valve 2 3 are fine-tuned, the valve is controlled to adjust the opening by 0.1% every 0.5 seconds; when the auxiliary electric regulating butterfly valve 1 2 and the auxiliary electric regulating butterfly valve 2 3 are quickly adjusted, the valve is adjusted at an opening of 10% each time, and there is a pause of 1 second after each adjustment of 10%. Example

[0026] An automatic filling and discharging actuator for a thin oil sealed gas tank, the connection relationship is as follows Figure 1 , Figure 1 As shown in the figure, the present invention is installed on the gas pipeline in front of the thin oil sealed gas cabinet. It consists of three electric regulating butterfly valves to form a valve group. The main electric regulating butterfly valve 1 is installed on the main pipeline in front of the cabinet, and two auxiliary electric regulating butterfly valves (auxiliary electric regulating butterfly valve 1 2 and auxiliary electric regulating butterfly valve 2 3) are installed on the left and right sides of the main electric regulating butterfly valve 1 to serve as bypass of the main electric regulating butterfly valve 1.

[0027] Figure 1 As shown in FIG, the power supply of the three electric regulating butterfly valves of the present invention is distributed from the low voltage distribution cabinet 12. The control lines of the three electric regulating butterfly valves are connected to the PLC control system 10.

[0028] Figure 1 As shown in the figure, the blast furnace gas main network is equipped with a gas pressure sensor 8, which is connected to the PLC control system 10 via a signal line. The blast furnace gas cabinet is equipped with a gas tank gas pressure sensor 6, which monitors the pressure of the blast furnace gas main network and the gas pressure in the gas tank in real time and feeds the signal back to the PLC control system.

[0029] The use process of the present invention is as follows: When the blast furnace gas main pressure is higher than the pressure inside the oil-sealed gas holder, the oil-sealed gas holder will be filled when the pipe valve in front of the holder is opened, increasing the gas reserve inside the holder and decreasing the blast furnace gas main pressure. When the blast furnace gas main pressure is lower than the pressure inside the oil-sealed gas holder, the pipe valve in front of the holder will be opened, causing the oil-sealed gas holder to be drained, decreasing the gas reserve inside the holder and increasing the blast furnace gas main pressure.

[0030] The PLC control system controls the valve opening and the gas filling and exhaust volume of the gas holder according to the detected blast furnace gas main pressure and the preset control program, thereby stabilizing the blast furnace gas main network within a certain pressure range.

[0031] Set the four blast furnace gas main pressures (HH (High High), H (High), LL (Low Low), and L (Low)) in advance in the PLC control program. Once the automatic charging and discharging cabinet program is operational, the main electric regulating butterfly valve automatically opens to 15%, while auxiliary electric regulating butterfly valves 1 and 2 simultaneously open to 30%. This is the initial state of the three valves in the valve group after the automatic charging and discharging cabinet is operational. During automatic adjustment, the main electric regulating butterfly valve remains at 15%, but manual adjustment is possible.

[0032] When the main line pressure falls below LL, the auxiliary electric regulating butterfly valves 1 and 2 are simultaneously and rapidly adjusted, adjusting their opening by 10% at a time. After each 10% adjustment, there is a 1-second pause to determine whether the pressure has reached or exceeded LL. If not, the valves continue to open until the opening of the auxiliary electric regulating butterfly valves 1 and 2 reaches 90%. If LL is reached, the auxiliary electric regulating butterfly valves 1 and 2 are fine-tuned based on the existing opening, and the valve actuation speed is adjusted according to the set proportional parameters until the pressure is adjusted to L.

[0033] The auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are not adjusted within the main pipe pressure LH range.

[0034] When the main pressure exceeds HH, the auxiliary electric regulating butterfly valves 1 and 2 are adjusted simultaneously and rapidly, adjusting the opening by 10% at a time. After each 10% adjustment, there is a 1-second pause to determine whether the pressure has reached or exceeded HH. If not, the valves continue to open until the opening of the auxiliary electric regulating butterfly valves 1 and 2 reaches 90%. If HH is reached, the auxiliary electric regulating butterfly valves 1 and 2 are fine-tuned based on the existing opening, and the valve actuation speed is adjusted according to the set proportional parameters until the pressure is adjusted to H.

[0035] If the gas tank level is higher than or lower than the set upper limit for automatic adjustment, the PLC control system will prompt: "Gas tank level exceeded, please switch to manual adjustment." In this case, you need to manually click the "Automatic Filling and Discharging" switch button to switch to manual adjustment.

[0036] If the "Automatic Filling and Discharging" switch button is not clicked in time and manual adjustment is required, the PLC program will perform the following program control to ensure the safety of the gas cabinet: 1. When the gas tank level is higher than the set upper limit for automatic adjustment: (1) When the main pressure is higher than the gas pressure in the gas tank, the program controls the closing of the main electric regulating butterfly valve, auxiliary electric regulating butterfly valve 1, and auxiliary electric regulating butterfly valve 2. The closing speed is controlled by the set proportional parameters, and the opening is adjusted by 10% each time. There is a 1S pause after each 10% adjustment. If the main pressure is lower than the gas pressure in the gas tank during the valve closing process, the main electric regulating butterfly valve, auxiliary electric regulating butterfly valve 1, and auxiliary electric regulating butterfly valve 2 stop adjusting. If the pressure continues to be higher than the gas pressure in the gas tank during the valve closing process, the main electric regulating butterfly valve, auxiliary electric regulating butterfly valve 1, and auxiliary electric regulating butterfly valve 2 will all close.

[0037] (2) When the main pipe pressure is lower than L, the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are fine-tuned based on the existing opening, and the valve action speed is adjusted according to the set proportional parameters. The valve is controlled to adjust the opening by 0.1% every 0.5 seconds until the pressure is adjusted to L. If the pressure is lower than LL, the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are adjusted quickly at the same time, and the opening is adjusted by 10% each time. After each adjustment of 10%, there is a pause of 1S to determine whether the pressure reaches above LL. If it does not reach LL, it continues to open until the opening of the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 reaches 90%.

[0038] 2. When the gas tank position is lower than the set lower limit for automatic adjustment: 1. When the main pressure drops below the gas pressure inside the gas tank, the program controls the closing of the main electric regulating butterfly valve, auxiliary electric regulating butterfly valve 1, and auxiliary electric regulating butterfly valve 2. The closing speed is controlled by a set proportional parameter, with the opening adjusted in 10% increments, followed by a 1-second pause between each 10% adjustment. If the main pressure drops below the gas pressure inside the gas tank during the valve closing process, the main electric regulating butterfly valve, auxiliary electric regulating butterfly valve 1, and auxiliary electric regulating butterfly valve 2 will stop adjusting. If the pressure continues to drop below the gas pressure inside the gas tank during the valve closing process, the main electric regulating butterfly valve, auxiliary electric regulating butterfly valve 1, and auxiliary electric regulating butterfly valve 2 will all close.

[0039] 2. When the main pipe pressure is higher than H, the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are fine-tuned based on the existing opening. The valve action speed is adjusted according to the set proportional parameters. The valve is controlled to adjust the opening by 0.1% every 0.5 seconds until the pressure is adjusted to H. If the pressure is higher than HH, the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 are adjusted simultaneously and quickly, each time by 10%. After each adjustment of 10%, there is a pause of 1 second to determine whether the pressure reaches or exceeds HH. If it does not reach HH, it continues to open until the opening of the auxiliary electric regulating butterfly valve 1 and the auxiliary electric regulating butterfly valve 2 reaches 90%.

[0040] An embodiment of the present invention is as follows: Main electric regulating butterfly valve 1 Nominal diameter DN3000mm Auxiliary electric regulating butterfly valve 1200mm nominal diameter Auxiliary electric regulating butterfly valve 23 Nominal diameter DN1200mm Valve connecting pipe 4 Nominal diameter DN1200mm / DN3000mm Gas cabinet gas pressure sensor 6 CXT-SK intelligent pressure transmitter (0-20mA) Gas pressure sensor 8 CXT-SK intelligent pressure transmitter (0-20mA).

Claims

1. An automatic filling and discharging actuator for a thin oil sealed gas tank, which is arranged on the gas pipeline in front of the thin oil sealed gas tank, and is characterized by: The invention comprises a valve group installed on the main pipeline in front of the cabinet, a low-voltage power distribution cabinet (12) electrically connected to the valve group, a PLC control system (10) connected to the valve group control, a gas pressure sensor (8) and a gas cabinet gas pressure sensor (6) connected to the PLC control system (10), and a thin oil sealed gas cabinet (5) connected to the gas cabinet gas pressure sensor (6), the gas cabinet gas pressure sensor (6) being installed on the gas cabinet wall panel, the gas pressure sensor (8) being located on the blast furnace gas main pipeline (9), and the blast furnace gas main pipeline (9) being connected to the gas cabinet front gas pipeline (7); The valve group includes a main electric regulating butterfly valve (1), an auxiliary electric regulating butterfly valve 1 (2), and an auxiliary electric regulating butterfly valve 2 (3). The main electric regulating butterfly valve (1) is installed on the main pipeline in front of the cabinet. The main electric regulating butterfly valve (1) is connected to the gas pipeline (7) in front of the gas cabinet and the oil-sealed gas cabinet (5). The auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are installed on the bypass gas pipelines on the left and right sides of the main electric regulating butterfly valve (1).

2. The automatic filling and discharging actuator for a thin oil sealed gas tank according to claim 1 is characterized in that: The PLC control system (10) is connected to the gas pressure sensor (8) and the gas tank gas pressure sensor (6) via the pressure sensor signal line (14); the PLC control system (10) is connected to the valve group via the valve control line (11); and the low-voltage distribution cabinet (12) is connected to the valve group via the valve power line (13).

3. The automatic filling and discharging actuator of a thin oil sealed gas tank according to claim 1 is characterized in that: The auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are installed on the left and right sides of the main electric regulating butterfly valve (1) through the valve connecting pipe (4). The valve diameters of the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are 40% of the valve diameter of the main electric regulating butterfly valve (1).

4. The automatic filling and discharging actuator for a thin oil sealed gas tank according to claim 1 is characterized in that: The usage process is as follows: S1, the gas pressure of the blast furnace gas main pipeline (9) is higher than the pressure in the thin oil sealed gas tank (5), and the program controls the opening of the main electric regulating butterfly valve (1), the auxiliary electric regulating butterfly valve 1 (2), and the auxiliary electric regulating butterfly valve 2 (3), and the opening speed is controlled by the set proportional parameter; at this time, the pipeline valve in front of the tank is opened, the thin oil sealed gas tank (5) is filled, the gas reserve in the tank increases, and the gas pressure of the blast furnace gas main pipeline (9) decreases; The gas pressure of the blast furnace gas main pipeline (9) is lower than the pressure inside the thin oil sealed gas tank (5), and the program controls the opening of the main electric regulating butterfly valve (1), the auxiliary electric regulating butterfly valve 1 (2), and the auxiliary electric regulating butterfly valve 2 (3). The opening speed is controlled by the set proportional parameter. At this time, the pipeline valve in front of the tank is opened, the thin oil sealed gas tank (5) is discharged, the gas reserve in the tank is reduced, and the gas pressure of the blast furnace gas main pipeline (9) increases. S2, the PLC control system (10) controls the valve opening according to the detected pressure of the blast furnace gas main pipeline (9) and the preset control program, and controls the gas filling and exhaust volume of the oil-sealed gas tank (5), thereby stabilizing the blast furnace gas main network within the required pressure range; S3. The four values of the main pressure of the blast furnace gas, HH, H, LL, and L, are set in advance in the control program of the PLC control system (10). When the automatic filling and discharging cabinet program is put into operation, the main electric regulating butterfly valve (1) automatically opens to 15%, and the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are synchronously opened to 30%. This is the initial state of the three valves of the valve group after the automatic filling and discharging cabinet is put into operation; during the automatic adjustment period, the main electric regulating butterfly valve (1) remains unchanged at 15% and can be adjusted manually; at the same time, the upper limit range and lower limit range of the cabinet position allowed to be used by the automatic filling and discharging cabinet program of the gas cabinet are set in advance in the control program of the PLC control system (10); S4. When the main pipe pressure of blast furnace gas is lower than L, the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are fine-tuned based on the existing opening, and the valve action speed is adjusted according to the set proportional parameter until the main pipe pressure is adjusted to L; S5. When the main pressure of blast furnace gas is lower than LL, the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are adjusted simultaneously and quickly, and are adjusted by opening 10% each time. After each adjustment of 10%, there is a pause of 1S to judge whether the pressure reaches above LL. If it does not reach LL, it continues to open until the opening of the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) reaches 90%; if it reaches LL, the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are fine-tuned based on the existing opening, and the valve action speed is adjusted according to the set proportional parameter until the pressure is adjusted to L; S6, auxiliary electric regulating butterfly valve 1 (2) and auxiliary electric regulating butterfly valve 2 (3) are not adjusted within the main pipe pressure range of LH; S7. When the main pipe pressure of blast furnace gas is higher than H, the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are fine-tuned based on the existing opening, and the valve action speed is adjusted according to the set proportional parameter until the main pipe pressure is adjusted to H; S8. When the main pipe pressure of blast furnace gas is higher than HH, the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are adjusted quickly at the same time, and are adjusted by opening 10% each time. After each adjustment of 10%, there is a pause of 1S to judge whether the main pipe pressure reaches HH or above. If it does not reach HH, it continues to open until the opening of the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) reaches 90%; if it reaches HH, the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are fine-tuned based on the existing opening, and the valve action speed is adjusted according to the set proportional parameter until the main pipe pressure is adjusted to H; S9, when the gas tank position of the thin oil sealed gas tank (5) is higher than the upper limit range of the gas tank position that is allowed to be used by the automatic filling and draining program of the gas tank or lower than the lower limit range of the gas tank position that is allowed to be used by the automatic filling and draining program of the gas tank, the PLC control system (10) prompts "The tank position is out of limit, please switch to manual adjustment". At this time, it is necessary to manually click the "Automatic filling and draining" switch button to switch to manual adjustment; S10. After the prompt "Cabinet position exceeds the limit, please switch to manual adjustment", if manual adjustment is not intervened in time, for the safety of the gas cabinet, the control program of the PLC control system (10) performs program control under different working conditions. When the gas cabinet position is higher than the upper limit range of the cabinet position allowed for the automatic filling and discharging program of the gas cabinet and lower than the lower limit range of the cabinet position allowed for the automatic filling and discharging program of the gas cabinet, without switching to the manual intervention adjustment mode, the control program of the PLC control system (10) can continue to control the execution of automatic adjustment, so that the gas cabinet only discharges the cabinet but does not fill it, and only fills the cabinet but does not discharge it, thereby ensuring the safe cabinet position of the gas cabinet.

5. The automatic filling and discharging cabinet actuator of a thin oil sealed gas tank according to claim 4 is characterized in that: When the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are fine-tuned, the valve is controlled to adjust the opening by 0.1% every 0.5 seconds; when the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are quickly adjusted, the valve is adjusted by 10% of the opening each time, and there is a pause of 1 second after each adjustment of 10%.

6. The automatic filling and discharging actuator for a thin oil sealed gas tank according to claim 4 is characterized in that: In S10, specifically: When the gas tank position is higher than the upper limit of the gas tank position allowed by the automatic filling and discharging program, when the main pipe pressure is higher than the gas tank pressure, the main electric regulating butterfly valve (1), the auxiliary electric regulating butterfly valve 1 (2) and the auxiliary electric regulating butterfly valve 2 (3) are automatically controlled to close; when the main pipe pressure is lower than the gas tank pressure, the valve is adjusted to discharge the gas tank, so that the gas tank is only discharged but not filled; When the gas tank position is lower than the lower limit of the gas tank position set for the automatic filling and draining program, when the main pipe pressure is lower than the gas tank pressure, the main electric regulating butterfly valve (1), auxiliary electric regulating butterfly valve 1 (2) and auxiliary electric regulating butterfly valve 2 (3) are automatically controlled to close. When the main pipe pressure is higher than the gas tank pressure, the valve is adjusted to fill the tank, so that the gas tank is only filled but not drained.

7. The automatic filling and discharging actuator for a thin oil sealed gas tank according to any one of claims 1 to 6, characterized in that: The gas pressure sensor (8) and the gas cabinet gas pressure sensor (6) are both CXT-SK intelligent pressure transmitters.

Images