Separate control gas injection point device and control method thereof

Abstract

This invention discloses a device and method for separating and controlling gas injection points. It mainly consists of a winch system, a sealing system, a power system, and a control system. The gasifying agent is fed into the gasification working face through a continuous tube with a certain degree of flexibility and strength. The first end of the continuous tube is placed inside the gasifier and connected to a nozzle or flamethrower. The second end of the continuous tube passes through the sealing system, exits from the working hole of the gasifier, and connects to the winch system. The second end of the continuous tube is connected to the gasifying agent delivery pipeline. The continuous tube is wound around the winch system. When the gas injection point needs to be retracted, the winch power mechanism drives the continuous tube to move, thereby causing the gas injection point to retract continuously or periodically. During the movement, the sealing system ensures that the outer wall of the continuous tube remains sealed to the wall of the working hole of the gasifier, preventing gas leakage from inside the gasifier.

Description

Technical Field

[0001] This invention belongs to the field of coal and coalbed methane extraction technology, and relates to a control device for fluid injection and mining operations, particularly a device for separating and controlling gas injection points and its control method. Background Technology

[0002] Traditional underground and open-pit coal mining remain the main methods of coal mining in my country. The main problems are the harsh underground mining environment and low recovery rates in mines and mining areas (mine recovery rate less than 50%, generally between 40% and 48%, and mining area recovery rate less than 65%, generally between 50% and 65%). This results in the abandonment of large amounts of coal resources (such as coal pillars, edge coal, thin coal seams, and bottom coal that is difficult to mine, collectively referred to as residual coal and stagnant coal). In Shanxi Province alone, the amount of residual and stagnant coal resources reaches as high as 372.2 billion tons. Domestic and international methods for mining stagnant coal mainly include backfilling mining, limited-thickness mining, and plane-controlled mining. These methods still require manual entry into the coal face, facing mine disasters and risks such as water accumulation in old goafs, accumulation and emission of harmful gases, mine water inrush, and goaf collapse. Re-mining is difficult and the safety risks are high.

[0003] Coal gasification mining, also known as underground coal gasification technology, can convert coal into combustible gas in situ without the need for manual entry into the coal mining face. It mainly utilizes the thermal and chemical reactions between the gasifying agent and the coal to form a gasification reaction face, converting the solid combustible components in the coal into effective gas. Coal gasification mining technology has been applied to the mining of residual and stagnant coal in mines, forming mine gasification methods or underground gasification methods with shafts. The core of these methods is to establish a gasifier using the mine's roadway system. Patents published domestically and internationally, such as CN94111480, CN95103446, CN95111055, CN02125446, CN1298058, CN02158972, CN99125082, and CN98102197, all belong to this type of method. The advantage of this method is that the gasifier can be flexibly arranged by making full use of the existing mine roadway system. The main disadvantages are the lack of effective control measures for the gasification face, poor stability of the calorific value and composition of the coal gas, and large fluctuations in the gasifier's production capacity.

[0004] To improve the effective control of the gasification face, patent CN1112188 proposes a coal seam gasification method with a retractable injection point, using a fusion method to sequentially melt the injection pipeline, achieving periodic retraction of the injection point. Patent CN96106720 employs a pipeline-changing injection point retraction method, placing multiple injection pipelines within the injection channel and using a switching injection pipeline to replace the injection point, thus achieving retraction control. Similar patents include CN200510134205 and CN200520144344, which propose an electrofusion flap-type injection point controller. In this method, injection pipelines are installed within the injection channel, and electrofusion flap-type injection point controllers are spaced along these pipelines. When energized, the electrofusion wire melts, opening the four-way bypass and closing the downstream main line, allowing the injection point to move upwards as the gasification face moves. Furthermore, patents CN200810132905, CN201310327035, and CN201310248666 all involve a fusible control valve and a fusible opening device, the basic principle of which is similar to that of an electrofusion flap-type gas injection point controller. All of these patents involve the retraction operation of the gas injection point. Although different control methods are employed, these methods are overly complex. Because the control device is designed inside the gasifier, once placed, it cannot be continuously moved or removed, thus requiring extremely high reliability. Additionally, they lack mechanized and automated control. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems by proposing a gas injection point separation control device and its control method. This device can manually control the gas injection point to perform continuous and periodic retraction operations via a power mechanism located outside the gasifier; it can also automatically adjust the retraction time and speed of the gas injection point using a frequency conversion and hydraulic feedback control system, based on the gas injection point temperature, thereby achieving continuous, stable, and automatic control of the underground gasification process.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A separate control device for gas injection points mainly consists of a winch system, a sealing system, a power system, and a control system. The gasifying agent is fed into the gasification working face through a continuous tube with a certain flexibility and strength. The first end of the continuous tube is placed inside the gasifier and connected to a nozzle or burner. The last end of the continuous tube passes through the sealing system and is led out from the working hole of the gasifier, and connected to the winch system. The last end of the continuous tube is connected to the gasifying agent delivery pipeline. The continuous tube is wound around the winch system. When the gas injection point needs to be moved back, the winch power mechanism drives the continuous tube to move, thereby making the gas injection point move back continuously or periodically. During the movement, the sealing system can keep the outer wall of the continuous tube sealed with the wall of the working hole of the gasifier, preventing gas from leaking out of the gasifier.

[0008] The present invention achieves the retraction of the gas injection point by a winch system set outside the gasifier. It can move continuously or periodically, is flexible in operation and simple in structure, solves the problem of complicated retraction operation procedures in existing patents, and can ensure the safety and reliability of the operation process.

[0009] In this invention, the winch system mainly includes a guide tube device, a drum device, and a pipe-laying device; the drum device is used to wind the continuous tube; the guide tube device is used to clamp and straighten the continuous tube and drive the continuous tube to be injected and pulled out; the pipe-laying device is connected to the drum device to enable the pulled-out continuous tube to be neatly wound onto the drum device; the drum device includes a drum shaft, a drum disc, a core, a drive mechanism, and a support; the drum shaft, drum disc, and core are integrally connected together; the core and drum disc are used to wind the continuous tube; the drum shaft can rotate around the support; and the drive mechanism is movably connected to the drum shaft. The drive mechanism rotates the drum shaft to control the winding and unwinding of the continuous tube. The drive mechanism can be a hydraulic motor, electric motor, or diesel engine, with the motor being explosion-proof or explosion-proof isolated. The movable connection is a chain connection, toothed connection, or belt connection. The drum shaft is vertical, perpendicular to the horizontal plane, and the drum disc is parallel to the horizontal plane. The guide tube device includes a guide device, a drive mechanism, a clamping and straightening device, and a support. The guide device is hinged to the support and is arc-shaped, allowing it to change the bending direction of the continuous tube and coordinate with the winding and unwinding of the drum device. A pin-type force sensor and a pulling force sensor are installed at the support shaft of the continuous tube and guide device to monitor changes in tension on the continuous tube. The clamping and straightening device is a wheel structure, including a driving wheel and a driven wheel, which are arranged in pairs, generally with more than two pairs. Both the driving and driven wheels have an annular groove in the middle that can fit against the outer wall of the continuous tube. The distance between the bottom of the annular groove of the driving wheel and the bottom of the annular groove of the driven wheel is equal to the outer diameter of the continuous tube. The tube laying device includes a guide wheel, a drive mechanism, a moving device, and a bracket, wherein the guide wheel is connected to the moving device. The drive unit and the moving unit are mounted on the bracket. The drive mechanism and the moving unit are movably connected. The moving unit is a lead screw and nut. A hydraulic rotary reducer drives the lead screw to rotate. The lead screw nut and the guide wheel on the lead screw move together in a reciprocating linear motion on the lead screw. The pipe laying device drive mechanism is fixed on the drum shaft and shares a hydraulic motor with the drum device drive mechanism. A continuous pipe length encoder is installed on the guide wheel of the pipe laying device. The length of the oil pipe injected or pulled out is detected according to the speed of the encoder. The pipe laying device bracket is a movable bracket, which is driven by an electric push rod mechanism.

[0010] In this invention, the sealing system includes a control valve and a continuous pipe sealing device. An automatic control valve is installed on the working hole of the gasifier. The valve is then connected to the sealing device, which should be equipped with at least a static seal and / or a dynamic seal.

[0011] The primary function of static seals is to tighten or loosen the coiled tubing, maintaining a certain level of sealing performance with the gasifier's working orifice during movement and pressurized operations to prevent gas leakage. Dynamic seals primarily seal the coiled tubing orifice, suspended tubing, sheared tubing, and provide a complete well shut-in, including sealing components, suspension components, shearing components, and a complete sealing component. Static and dynamic seals are existing, well-known technologies. Static seals can utilize blowout preventers (BOPs), while dynamic seals can employ BOPs. The sealing device is characterized by using a hydraulically controlled multi-way valve (main valve) to control opening and closing, with the main valve controlled by an electrically controlled pilot valve. For safe operation of the sealing device, its status needs to be monitored during opening and closing. This system installs a clamping pressure sensor on the clamping hydraulic circuit of the sealing device to detect the closing status. When the closing pressure reaches the upper limit of the set value, it is considered reliably closed; during closure, if the pressure falls below the lower limit of the set value, the system alarms.

[0012] Furthermore, the present invention also includes a power system, comprising a hydraulic source, a hydraulic pump, an accumulator, and a power frequency converter; the accumulator is installed between the hydraulic source and the hydraulic output pipeline, and the power frequency converter sends power to the hydraulic pump motor and the electric push rod mechanism of the pipe laying device respectively. A hydraulic pressure sensor is installed in the accumulator circuit. During use, the hydraulic pump pressurizes the accumulator. When the accumulator pressure is lower than the lower limit of the set value, the motor is automatically started to open the accumulator charging / discharging valve to replenish the pressure. When the upper limit of the set value is reached, the hydraulic pump unloading valve opens, and the pressure replenishment ends.

[0013] Furthermore, the present invention also includes a control system, comprising a controller, a human-machine interface element, and a control switch. The controller is connected to a pin-type tension sensor, a pulling force sensor, a continuous tube length encoder, a continuous tube layer number sensing device, a clamping pressure sensor, and a hydraulic pressure sensor signal.

[0014] Furthermore, this invention incorporates a thermocouple or resistance temperature detector (RTD) inside the continuous tube, with the temperature measuring point located at the nozzle head. Using the nozzle head temperature as an indicator, a feedback control system automatically adjusts the continuous tube's retraction time and speed, achieving continuous retraction and circulating gasification, thereby ensuring the continuity and stability of the underground gasification process.

[0015] Furthermore, the present invention includes a remote control center, which communicates with the control system via wired or wireless communication. This remote control center is capable of remotely controlling the winch system, sealing system, and power system. It is also capable of displaying, recording, and storing parameters of each system device (injection speed, tubing length, pulling force, clamping force, tubing tension, etc.).

[0016] Furthermore, the control method of the control system of the present invention is as follows: when it is necessary to retract the gas injection point, the retraction distance of the gas injection point is set to L. The control system sends a local control signal to the controller through the human-machine interaction element or sends a control signal to the control system controller through the remote control center. The controller collects the clamping pressure sensor signal of the sealing device, detects the status of the sealing device, and sends a control signal to the electromagnetic pilot valve of the sealing device to realize the opening and closing of each sealing component of the sealing device.

[0017] At the same time, the controller outputs a control signal to the power frequency converter, which sends the power supply to the hydraulic pump of the power system, and the hydraulic pump charges the accumulator; at the same time, it collects the signal from the hydraulic pressure sensor of the accumulator, detects the status of the accumulator, and sends a control signal to the accumulator charging / discharging valve to provide hydraulic power to the sealing device.

[0018] After each sealing component of the sealing device completes its opening and closing operation, the controller sends a control signal to the electromagnetic pressure regulating valve of the guide tube device motor, adjusting the hydraulic motor spindle to reverse, driving the active wheel of the clamping and straightening device to reverse. Both the active wheel and the driven wheel have annular grooves in the middle that can fit against the outer wall of the continuous tube, realizing the clamping, straightening and pulling out of the continuous tube.

[0019] At the same time, the controller sends a control signal to the reversing valve of the drum hydraulic motor, the drum reverses, and synchronously drives the guide wheel and the nut to make reciprocating linear motion on the screw, winding the continuous tube and making the pulled continuous tube neatly arranged on the drum device.

[0020] At the same time, the controller collects signals from the continuous tube length encoder and the continuous tube layer number sensing device to detect the length of the continuous tube winding and determine whether the continuous tube winding is full. After the full layer is reached, the controller sends a control signal to the electric push rod mechanism to automatically extend and retract for a fixed period of time to ensure that the tube laying device is not subjected to additional force.

[0021] Simultaneously, the controller acquires signals from the pin-type tension sensor and sends control signals to the reversing valve of the drum hydraulic motor to adjust the speed of the drum assembly until the tension value on the continuous tube is restored to its initial value. The pulling force sensor measures the change in tension on the continuous tube and participates in system control, thereby controlling the working speed of the drum assembly and the guide tube assembly, ensuring a constant tension between the drum assembly and the guide tube assembly and the working speed of the continuous tube, and ensuring the safe and effective operation of automatic continuous tube lifting and lowering.

[0022] When the continuous tube length encoder detects that the continuous tube has retracted by a length L, the controller sends a control signal to the solenoid pressure regulating valve of the guide tube device motor, causing the guide tube device to stop working and return to standby mode. Simultaneously, the controller acquires the signal from the pin-type tension sensor and sends a control signal to the reversing valve of the drum hydraulic motor to stop the drum device from rotating and return it to standby mode. The controller also acquires the signal from the accumulator hydraulic pressure sensor to detect the accumulator status and sends a control signal to the accumulator charging / discharging valve to provide hydraulic power to the sealing device for the opening and closing of its various sealing components. The retraction operation is then complete.

[0023] Beneficial effects of the present invention

[0024] 1. The retraction of the gas injection point is achieved by a winch system set outside the gasifier. It can move continuously or periodically, is flexible in operation and simple in structure, solves the problem of the complicated retraction operation procedure of existing patents, and can ensure the safety and reliability of the operation process.

[0025] 2. The procedure for continuous tube retraction has been simplified, facilitating remote and centralized control. The use of feedback control enables automatic retraction based on monitoring signals, thereby improving the intelligence level of the device.

[0026] 3. It adopts an explosion-proof design, which can be used in mines, especially high-gas mines. The main power system is located outside the gasifier, which is easy to maintain and repair.

[0027] 4. The continuous tube can withstand a smaller gravity load, which reduces the system's power consumption. Attached Figure Description

[0028] The separation control gas injection point device of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Figure 1 This is a top view schematic diagram of the overall structure of the separation control gas injection point device of the present invention;

[0030] Figure 2 This is a schematic diagram of the winch system drum device structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the winch guide device of the present invention;

[0032] Figure 4 This is a schematic diagram of the sealing device structure of the sealing system of the present invention;

[0033] Figure 5 This is a schematic diagram of the automatic control process of the present invention.

[0034] The codes in the attached diagram are as follows:

[0035] Ⅰ. Winch system; Ⅱ. Sealing system; Ⅲ. Power system; Ⅳ. Control system; Ⅴ. Remote control center;

[0036] 1. Gasifier inlet side roadway or chamber; 2. Working hole set in the roadway; 3. Continuous pipe; 4. Nozzle or flamethrower (with temperature measuring point); 5. Control valve; 6. Continuous pipe sealing device; 7. Conduit device; 8. Drum device; 9. Pipe laying device; 10. Gasification agent delivery pipeline.

[0037] 11. Drum shaft; 12. Drum reel; 13. Core; 14. Drive mechanism; 15. Support.

[0038] 21. Guiding device; 22. Drive mechanism; 23. Clamping and straightening device; 24. Bracket; 25. Pin-type force sensor; 26. Pulling force sensor; 27. Drive wheel; 28. Driven wheel; 29. ​​Motor solenoid pressure regulating valve.

[0039] 31. Including guide wheel, 32. drive mechanism, 33. moving device, 34. bracket, 35. continuous tube length encoder, 36. electric push rod mechanism, 37. continuous tube layer number sensing device;

[0040] 41. Static seal; 42. Dynamic seal; 43. Clamping pressure sensor; 44. Electrically controlled pilot valve.

[0041] 51. Hydraulic source; 52. Hydraulic pump; 53. Accumulator; 54. Power frequency converter; 55. Hydraulic pressure sensor; 56. Accumulator charging / discharging valve; 57. Hydraulic pump unloading valve.

[0042] 61. Controller; 62. Human-machine interface element; 63. Control switch. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings.

[0044] like Figure 1 , 2As shown in Figures 3 and 4, a separate control gas injection point device includes: a winch system (Ⅰ), a sealing system (Ⅱ), a power system (Ⅲ), and a control system (Ⅳ). The main function of the winch system (Ⅰ) is to drive the rotating shaft (11) of the winding coiled tube (3) to rotate and straighten the coiled tube on the drum, so that the coiled tube moves axially to realize the function of injecting and pulling out the coiled tube; the main function of the sealing system (Ⅱ) is to maintain a certain sealing performance with the working hole (2) of the gasifier during the movement of the coiled tube to prevent gas leakage in the furnace; at the same time, it can seal the coiled tube orifice, suspend the oil pipe, shear the oil pipe, and fully seal the well to ensure the safety of the pressurized operation process; the main function of the power system (Ⅲ) is to provide driving force for the winch system and the sealing system; the main function of the control system (Ⅳ) is to operate and control the winch system, the sealing system, and the power system, and can also monitor the operating status of each system.

[0045] When in use, the separation control gas injection point device is installed in the gas inlet side roadway or chamber (1) of the gasifier. The first end of the continuous pipe (3) with certain flexibility and strength is placed in the gasifier, and the first end is connected to the nozzle or flamethrower (4) as the gas injection point for the gasification process. The tail end of the continuous pipe passes through the working hole (2) of the gasifier, the control valve (5) on the sealing system (II), and the continuous pipe sealing device (6) in sequence. It is led out from the gasifier and after passing through the guide pipe device (7) of the winch system (I), it is wound on the winch system drum device (8). The tail end of the continuous pipe is connected to the gasifying agent delivery pipeline (10).

[0046] like Figure 1 As shown, the winch system (I) includes a guide tube device (7), a drum device (8), and a pipe laying device (9). The drum device (8) is used to wind the continuous tube (3); the guide tube device (7) is used to clamp and straighten the continuous tube (3) and drive the continuous tube to be injected and pulled out; the pipe laying device (9) is connected to the drum device (8) so that the pulled-out continuous tube (3) is neatly wound onto the drum device (8).

[0047] like Figure 1 , 2As shown, the winding device (8) includes a winding shaft (11), a winding disc (12), a core (13), a drive mechanism (14), and a bracket (15). The winding shaft (11), winding disc (12), core (13), and drive mechanism (14) are mounted on the bracket (15). The winding shaft (11), winding disc (12), and core (13) are connected together as a whole. The core and winding disc are used to wind the continuous tube (3). The winding shaft (11) is a vertical shaft type, with the shaft perpendicular to the horizontal plane, and the winding disc (12) is parallel to the horizontal plane. The winding shaft (11) can rotate around the bracket (15). The drive mechanism (14) is movably connected to the winding shaft (11). The drive mechanism can drive the winding shaft to rotate, thereby controlling the winding and unwinding of the continuous tube (3). The drive mechanism (14) can be a hydraulic motor, an electric motor, a diesel engine, etc. In this embodiment, it is a hydraulic motor. The motor is explosion-proof or has been treated with explosion-proof isolation. The movable connection here can be a chain connection, a toothed connection, a transmission belt connection, etc. In this embodiment, it is a chain connection. The hydraulic motor drives the shaft to rotate forward and backward through the reversing valve and the chain.

[0048] like Figure 1 , 3 As shown, the conduit assembly (7) includes: a guide device (21), a drive mechanism (22), a clamping and straightening device (23), and a support (24). The guide device (21), drive mechanism (22), and clamping and straightening device (23) are mounted on the support (24) in a nearly horizontal direction, with the guide device (21) hinged to the support (24). The guide device (21) is arc-shaped and can change the bending direction of the continuous tube (3), cooperating with the winding device (8) to wind and release the continuous tube (3). At the support shaft of the guide device (21), a pin-type force sensor (25) and a pulling force sensor (26) are installed to monitor the change in tension on the continuous tube (3). The clamping and straightening device (23) is a wheel structure, including a driving wheel (27) and a driven wheel (28). The driving and driven wheels are arranged in pairs, and the number is generally greater than or equal to two pairs. Both the driving and driven wheels have annular grooves (not shown) in the middle that can fit against the outer wall of the continuous tube (3). The distance between the bottom of the annular groove of the driving wheel (27) and the bottom of the annular groove of the driven wheel (28) is equal to the outer diameter of the continuous tube (3).

[0049] The drive mechanism (22) can be a hydraulic motor, an electric motor, a diesel engine, etc. In this embodiment, it is a hydraulic motor, which is explosion-proof or explosion-proof isolated. The drive mechanism (22) is connected to the drive shaft of the drive wheel through a coupling, which can drive the drive wheel (27) to rotate, thereby clamping and straightening the continuous tube. During use, the continuous tube (3) is placed between the annular grooves of the drive wheel (27) and the driven wheel (28), and then the rotation direction of the hydraulic motor spindle is adjusted by the motor solenoid pressure regulating valve (29), thereby controlling the forward and reverse rotation of the drive wheel, and thus realizing the clamping, straightening, injection and pulling out of the continuous oil tube.

[0050] like Figure 1 , 2 As shown in Figure 3, the pipe-laying device (9) includes a guide wheel (31), a drive mechanism (32), a moving device (33), and a bracket (34). The guide wheel (31) is connected to the moving device (33), and the drive mechanism (32) and the moving device (33) are mounted on the bracket (34). The drive mechanism (32) and the moving device (33) are movably connected, such as by a chain, a toothed connection, or a transmission belt connection. In this embodiment, it is a chain connection. The drive mechanism (32) can be a hydraulic rotary reducer, a geared motor, etc. In this embodiment, it is a hydraulic rotary reducer. The moving device (33) can be any form of screw drive mechanism. In this embodiment, it is a lead screw and nut. The hydraulic rotary reducer drives the lead screw to rotate, and the lead screw nut and the guide wheel (31) together make reciprocating linear motion on the lead screw. This allows the pulled-out flamethrowers (4) to be neatly arranged on the drum device (8). The pipe laying device drive mechanism (32) is fixed on the drum shaft (11) and shares a hydraulic motor with the drum device (8) drive mechanism.

[0051] A continuous tube length encoder (35) is installed on the guide wheel (31) of the tube laying device to detect the length of the oil tube injected or pulled out according to the speed of the encoder. The tube laying device support (34) is a movable support, which can be hydraulically driven or electrically driven. In this embodiment, it is driven by an electric push rod mechanism (36), which realizes the lifting and lowering action of the push rod by changing the direction of the motor. The lifting and lowering of the electric push rod is automatically controlled by the continuous tube layer number sensing device (37). When the number of oil tube layers changes, the electric push rod automatically extends and retracts for a fixed period of time to ensure that the tube laying device is not subjected to additional force.

[0052] like Figure 1As shown, the sealing system (II) includes a control valve (5) and a continuous tube sealing device (6). The control valve (5) is installed on the working hole (2) of the gasifier, and automatic control valves are preferred. The valve is then connected to the sealing device (6). The sealing device (6) should be equipped with at least a static seal (41) and / or a dynamic seal (42). The sealing device is equipped with a clamping pressure sensor (43). The main function of the static seal (41) is to clamp or loosen the continuous tube so that the continuous tube maintains a certain sealing performance with the working hole (2) of the gasifier during the movement process and the pressurized operation process, so as to prevent gas leakage in the furnace. The main function of the dynamic seal (42) is to seal the continuous tube orifice, suspend the tubing, shear the tubing, and fully seal the well. It includes a sealing assembly, a suspension assembly, a shearing assembly, and a full sealing assembly (not shown in the figure). Static seal and dynamic seal are existing known technologies. The static seal can use a blowout preventer box, and the dynamic seal can use a blowout preventer. The sealing device (6) is controlled by a hydraulic multi-way valve (main valve). The main valve is controlled by an electrically controlled pilot valve (44). For the sealing device (6) to operate safely, its status needs to be detected during opening and closing. This system installs a clamping pressure sensor (43) on the clamping hydraulic oil line of the sealing device (6) to detect the closing status. When the closing pressure reaches the upper limit of the set value, it is considered to be reliably closed; during the closing period, if the pressure is lower than the lower limit of the set value, the system alarms.

[0053] like Figure 1 As shown, the power system (Ⅲ) mainly provides hydraulic power and electricity to the winch system (Ⅰ) and sealing system (Ⅱ), including a hydraulic source (51), a hydraulic pump (52), an accumulator (53), and a power frequency converter (54). The accumulator (53) is installed between the hydraulic source (51) and the power frequency converter (54) to stabilize the hydraulic output pressure and ensure the smooth operation of the hydraulic power equipment. A hydraulic pressure sensor (55) is installed in the accumulator (53) circuit. During use, the hydraulic pump (52) pressurizes the accumulator (53). When the accumulator pressure is lower than the lower limit of the set value, the motor is automatically started to open the accumulator charging / discharging valve (56) to replenish the pressure. When the upper limit of the set value is reached, the hydraulic pump unloading valve (57) opens, and the pressure replenishment ends. The power frequency converter (54) sends the power to the hydraulic pump motor and the electric push rod mechanism of the pipe laying device.

[0054] like Figure 1 , 4As shown, the control system (Ⅳ) operates and controls the winch system (Ⅰ), sealing system (Ⅱ), and power system (Ⅲ), and can also monitor the operating status of each system. It includes a controller (61), a human-machine interface element (62), and a control switch (63). The controller (61) collects signals from the pin tension sensor (25), the lifting force sensor (26), the continuous tube length encoder (35), the continuous tube layer number sensing device (37), the clamping pressure sensor (43), and the hydraulic pressure sensor (55). It also receives local operation commands and remote operation commands, and communicates with the human-machine interface element (62) and the control switch (63). The human-machine interface element (62) can display local working parameters and input and modify control parameters; the control switch (63) can switch the manual operation control of movable parts. After analyzing and calculating the collected signals and received instructions, the controller (61) outputs control signals to control the hydraulic pump unloading valve (57), accumulator charging / discharging valve (56), conduit device motor solenoid pressure regulating valve (29), sealing device electric pilot valve (44), and drum hydraulic motor reversing valve (16) to start and stop the hydraulic pump station; open and close the sealing device; start and stop the conduit device; adjust the injection and pull-out speed; start and stop the drum device; adjust the winding and release speed; and adjust the pipe laying device height and compensation, etc.

[0055] Furthermore, by feedback control with the burner (4) or the gas components at the gasifier outlet, the separation control gas injection point device can automatically control the retraction operation of the gas injection point. Taking a thermocouple as an example, the burner (4) located at the beginning of the continuous tube (3) transmits the temperature of the nozzle end of the gasification working face to the controller (61). When the temperature is higher than the set value, the program to pull out the burner (4) is started. The control system (Ⅳ) issues a control command, and the winch system (Ⅰ), sealing system (Ⅱ), and power system (Ⅲ) will retract the continuous tube (3) by a set length according to the set program to realize the separation and control of the gas injection point. After waiting for a period of time, if the temperature is within the safe range, the device returns to the standby state, and the coal seam continues to burn and gasify at this position.

[0056] Furthermore, a remote control center (V) can be set up. The remote control center and the control system (IV) use wired or wireless communication to remotely control the winch system (I), sealing system (II), and power system (III). It can display, record, and store the equipment parameters of each system (injection speed, tubing length, pulling force, clamping force, tubing tension, etc.).

[0057] like Figure 1 , 2 As shown in Figures 3 and 4, in this embodiment, the control procedure for separating and controlling the gas injection point is as follows:

[0058] When it is necessary to move the gas injection point backward, the backward distance of the gas injection point is set to L. The control system (Ⅳ) sends a local control signal to the controller (61) through the human-machine interaction element (62) or the remote control center (Ⅴ) sends a control signal to the control system (Ⅳ) controller (61). The controller (61) collects the signal of the clamping pressure sensor (43) of the sealing device (6), detects the status of the sealing device, and sends a control signal to the electric pilot valve (44) of the sealing device to realize the opening and closing of each sealing component of the sealing device.

[0059] At the same time, the controller (61) outputs a control signal to the power inverter (54) to send the power supply to the hydraulic pump (52) of the power system (Ⅲ), and the hydraulic pump fills the accumulator (53) with liquid; at the same time, it collects the signal of the hydraulic pressure sensor (55) of the accumulator (53), detects the status of the accumulator, and sends a control signal to the accumulator charging / discharging valve (56) to provide hydraulic power to the sealing device.

[0060] After the sealing components of the sealing device complete the opening and closing operation, the controller (61) sends a control signal to the electromagnetic pressure regulating valve (29) of the conduit device motor to adjust the hydraulic motor spindle to reverse, and drive the driving wheel (27) of the clamping and straightening device (23) to reverse. The middle of the driving wheel (27) and the driven wheel (28) both have annular grooves that can fit with the outer wall of the flamethrower (4) to realize the clamping, straightening and pulling out of the continuous tube.

[0061] At the same time, the controller (61) sends a control signal to the reversing valve (16) of the drum hydraulic motor, the drum reverses, and synchronously drives the guide wheel (31) and the nut to make reciprocating linear motion on the screw, winding the continuous tube (3), and making the pulled continuous tube (3) neatly arranged on the drum device (8).

[0062] At the same time, the controller (61) collects signals from the continuous tube length encoder (35) and the continuous tube layer number sensing device (37), detects the length of the continuous tube winding, and determines whether the continuous tube winding is full. After the full layer is reached, it sends a control signal to the electric push rod mechanism (36) to automatically extend and retract for a fixed time period to ensure that the tube laying device is not subjected to additional force.

[0063] Simultaneously, the controller (61) acquires the signal from the pin-type tension sensor (25) and sends a control signal to the reversing valve (16) of the drum hydraulic motor to adjust the rotation speed of the drum device (8) until the tension value on the continuous tube (3) is as it was initially. The lifting force sensor (26) measures the change in tension of the continuous tube and participates in the system control, thereby controlling the working speed of the drum device (8) and the guide tube device (7), ensuring a certain constant tension and working speed of the continuous tube between the drum device (8) and the guide tube device (7), and ensuring the safe and effective operation of the automatic lifting and lowering of the continuous tube.

[0064] When the continuous tube length encoder (35) detects that the continuous tube has retreated to a length of L, the controller (61) sends a control signal to the solenoid pressure regulating valve (29) of the guide tube device motor, and the guide tube device (7) stops working and returns to the standby state; the controller (61) simultaneously collects the signal from the pin tension sensor (25) and sends a control signal to the reversing valve (16) of the drum hydraulic motor, and the drum device (8) stops rotating and returns to the standby state; the controller (61) simultaneously collects the signal from the accumulator (53) hydraulic pressure sensor (55), detects the accumulator status, and sends a control signal to the accumulator charging / discharging valve (56) to provide hydraulic power to the sealing device for the opening and closing of each sealing component of the sealing device. The retreat operation ends.

Claims

1. A device for separating and controlling gas injection points, characterized in that: The device consists of a winch system, a sealing system, a power system, and a control system. The gasifying agent is fed into the gasification working face through a continuous tube with a certain degree of flexibility and strength. The first end of the continuous tube is placed inside the gasifier and connected to a nozzle or flamethrower. The second end of the continuous tube passes through the sealing system and is led out from the working hole of the gasifier, and is connected to the winch system. The second end of the continuous tube is connected to the gasifying agent delivery pipeline. The continuous tube is wound around the winch system. When the gas injection point needs to be moved back, the winch power mechanism drives the continuous tube to move, so that the gas injection point moves back continuously or periodically. During the movement, the sealing system can keep the outer wall of the continuous tube sealed with the wall of the working hole of the gasifier, preventing gas from leaking out of the gasifier. The winch system mainly includes a guide tube assembly, a drum assembly, and a tube arrangement assembly; the drum assembly is used to wind the continuous tube; the guide tube assembly is used to clamp and straighten the continuous tube and drive the continuous tube to be injected and pulled out; the tube arrangement assembly is connected to the drum assembly to enable the pulled-out continuous tube to be neatly wound onto the drum assembly. The winding device includes a winding shaft, a winding disc, a core, a drive mechanism, and a support. The winding shaft, winding disc, and core are integrally connected together. The core and winding disc are used to wind a continuous tube. The winding shaft can rotate around the support. The drive mechanism is movably connected to the winding shaft. The drive mechanism can drive the winding shaft to rotate, thereby controlling the winding and unwinding of the continuous tube. The drive mechanism is a hydraulic motor, an electric motor, or a diesel engine. The motor is explosion-proof or has undergone explosion-proof isolation treatment. The movable connection here is a chain connection, a toothed connection, or a transmission belt connection. The winding shaft is a vertical shaft type, with the shaft perpendicular to the horizontal plane and the winding disc parallel to the horizontal plane. The sealing system includes control valves and a continuous pipe sealing device. An automatic control valve is installed on the working port of the gasifier. The valves are then connected to the sealing device, which should be equipped with at least a static seal and / or a dynamic seal. The control system includes a controller, human-machine interface components, and control switches. The controller is connected to pin-type tension sensors, pulling force sensors, continuous tube length encoders, continuous tube layer number sensing devices, clamping pressure sensors, and hydraulic pressure sensor signals.

2. The device for separating and controlling the gas injection point as described in claim 1, characterized in that: The guide tube assembly includes a guide device, a drive mechanism, a clamping and straightening device, and a support. The guide device is hinged to the support and is arc-shaped, which can change the bending direction of the continuous tube and cooperate with the winding device to wind and release the continuous tube. A pin-type force sensor and a pulling force sensor are installed at the support shaft of the guide device to monitor the tension change on the continuous tube. The clamping and straightening device is a wheel structure, including a driving wheel and a driven wheel. The driving and driven wheels are arranged in pairs, and the number is greater than or equal to 2 pairs. The middle of the driving and driven wheels has an annular groove that can fit against the outer wall of the continuous tube. The distance between the bottom of the annular groove of the driving wheel and the bottom of the annular groove of the driven wheel is equal to the outer diameter of the continuous tube.

3. The device for separating and controlling the gas injection point as described in claim 1, characterized in that: The pipe laying device includes a guide wheel, a drive mechanism, a moving device, and a support. The guide wheel is connected to the moving device, and the drive mechanism and the moving device are mounted on the support. The drive mechanism and the moving device are movably connected. The moving device is a lead screw and nut. A hydraulic rotary reducer drives the lead screw to rotate. The lead screw nut and the guide wheel together perform reciprocating linear motion on the lead screw. The pipe laying device drive mechanism is fixed on the drum shaft and shares a hydraulic motor with the drum device drive mechanism. A continuous pipe length encoder is installed on the guide wheel of the pipe laying device. The length of the oil pipe injected or pulled out is detected according to the speed of the encoder. The pipe laying device support is a movable support, which is driven by an electric push rod mechanism.

4. The device for separating and controlling the gas injection point as described in claim 1, characterized in that: The power system includes a hydraulic power source, a hydraulic pump, an accumulator, and a power frequency converter. The accumulator is installed between the hydraulic power source and the hydraulic output pipeline. The power frequency converter sends power to the hydraulic pump motor and the electric push rod mechanism of the pipe laying device. A hydraulic pressure sensor is installed in the accumulator circuit. When in use, the hydraulic pump pressurizes the accumulator. When the accumulator pressure is lower than the lower limit of the set value, the motor is automatically started to open the accumulator charging / discharging valve to replenish the pressure. When the upper limit of the set value is reached, the hydraulic pump unloading valve opens, and the pressure replenishment ends.

5. The device for separating and controlling the gas injection point as described in claim 1, characterized in that: Thermocouples or resistance thermometers are installed inside the continuous tube, and the temperature measuring point is located on the nozzle.

6. The control method for a separate control gas injection point device as described in claim 1, characterized in that: The control method is as follows: When it is necessary to retract the air injection point, the retraction distance of the air injection point is set to L. The control system sends a local control signal to the controller through the human-machine interface element or sends a control signal to the control system controller through the remote control center. The controller collects the clamping pressure sensor signal of the sealing device, detects the status of the sealing device, and sends a control signal to the electromagnetic pilot valve of the sealing device to realize the opening and closing of each sealing component of the sealing device.

7. The control method for a separate control gas injection point device as described in claim 6, characterized in that: The controller synchronously outputs a control signal to the power frequency converter, which sends the power supply to the hydraulic pump of the power system, and the hydraulic pump charges the accumulator. At the same time, it collects the signal from the hydraulic pressure sensor of the accumulator, detects the status of the accumulator, and sends a control signal to the accumulator charging / discharging valve to provide hydraulic power to the sealing device.

8. The control method for a separate control gas injection point device as described in claim 6, characterized in that: After each sealing component of the sealing device completes its opening and closing operation, the controller sends a control signal to the electromagnetic pressure regulating valve of the guide tube device motor, adjusting the hydraulic motor spindle to reverse, driving the active wheel of the clamping and straightening device to reverse. Both the active wheel and the driven wheel have annular grooves in the middle that can fit against the outer wall of the continuous tube, realizing the clamping, straightening and pulling out of the continuous tube.

9. The control method for a separate control gas injection point device as described in claim 6, characterized in that: The controller synchronously sends a control signal to the reversing valve of the drum hydraulic motor, causing the drum to reverse and synchronously drive the guide wheel and the nut to perform reciprocating linear motion on the screw, winding the continuous tube and making the pulled continuous tube neatly arranged on the drum device.

10. The control method of the separation control gas injection point device as described in claim 6, characterized in that: The controller synchronously acquires signals from the continuous tube length encoder and the continuous tube layer number sensing device, detects the length of the continuous tube winding, and determines whether the continuous tube winding is full. Once full, it sends a control signal to the electric push rod mechanism to automatically extend and retract for a fixed time period to ensure that the tube laying device is not subjected to additional force.

11. The control method of the separation control gas injection point device as described in claim 6, characterized in that: The controller synchronously acquires signals from the pin-type tension sensor and sends control signals to the reversing valve of the drum hydraulic motor to adjust the speed of the drum device until the tension value on the continuous tube is restored to its initial value. The pulling force sensor measures the change in tension of the continuous tube and participates in the system control, thereby controlling the working speed of the drum device and the guide tube device, ensuring a certain constant tension between the drum device and the guide tube device and the working speed of the continuous tube, and ensuring the safe and effective operation of automatic continuous tube lifting and lowering.

12. The control method of the separation control gas injection point device as described in claim 6, characterized in that: When the continuous tube length encoder detects that the continuous tube has retreated to a length of L, the controller sends a control signal to the solenoid pressure regulating valve of the guide tube device motor, and the guide tube device stops working and returns to the standby state. At the same time, the controller collects the signal from the pin tension sensor and sends a control signal to the reversing valve of the drum hydraulic motor to stop the drum device from rotating and return it to the standby state. At the same time, the controller collects the signal from the accumulator hydraulic pressure sensor, detects the accumulator status, and sends a control signal to the accumulator charging / discharging valve to provide hydraulic power to the sealing device to open and close the sealing components of the sealing device, and the retreat operation ends.

Images