Automatic flushing device for air cooling radiator tube bundle

Abstract

The utility model belongs to the technical field of radiator cleaning, and provides an automatic flushing device for an air cooling radiator tube bundle, which comprises a truss cart and a flushing trolley, the truss cart is driven by a truss cart stepping motor and can reciprocate along a radiator tube bundle frame track, and truss cart limit switches are respectively mounted at two ends of the radiator tube bundle frame track; the washing trolley is arranged on the truss cart, the washing trolley is driven by a washing trolley stepping motor and can move back and forth along a trolley track on the truss cart, and washing trolley limiting switches are installed at the two ends of the trolley track respectively; the flushing trolley is also connected with a flushing water pipe; stepping motors of the truss cart and the washing trolley are electrically connected with a circuit control system in the control box through stepping motor drivers respectively; according to the device, the programmable controller is adopted to control the stepping motor to drive the truss cart and the flushing trolley, the automation level of the flushing device is improved, and all-directional full-automatic flushing operation on the air cooling radiator tube bundle is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of radiator cleaning, and relates to a fully automatic positioning operation washing device, in particular to a fully automatic positioning operation washing device for an air-cooled radiator tube bundle. Background Art

[0002] The air-cooling island of the steam turbine generator set is the main device for air cooling in the power plant. It is mainly used in the coal-rich and water-scarce areas in the north. Direct air cooling technology has the advantages of water saving and small footprint. The air-cooling island is exposed to the air for a long time. The fine sand, dust in the air, and impurities such as debris generated by strong winds accumulate on the fins of the radiator tube bundle, resulting in a decrease in the heat exchange capacity of the air-cooling island, a decrease in the efficiency of condensing exhaust steam into water after the turbine works, an increase in the vacuum degree of the exhaust port, and a decrease in the turbine work efficiency. In serious cases, it affects the safe production of the normal unit.

[0003] In order to improve the efficiency of air cooling operation and maintain the normal operation of the air cooling island, the radiator tube bundle of the air cooling island must be flushed normally to improve the heat exchange efficiency of the air cooling island; the traditional cleaning operation of the air cooling island requires on-site tracking and operation by personnel. After the operator controls the position of the flushing cart and the small cart on site, the flushing valve is opened to realize the flushing operation. Due to the low degree of automation, the flushing cart and the small cart are driven by AC motors, and there is no position feedback. They can only be operated manually, and the operation efficiency is low. Some flushing work is even performed entirely by hand. Not only is the work efficiency low, but the operators also work in high temperature and high altitude environments for a long time, which poses a great safety hazard.

[0004] At the same time, a certain number of air-cooling fans are generally arranged under the radiator tube bundle of the air-cooling island. During the operation of the unit, if the heat dissipation tube bundle of the air-cooling island is cleaned, the flushing water dripping may damage the fan motor. Therefore, when cleaning the radiator tube bundle of the air-cooling island, it is necessary to stop the operation of the air-cooling fan below the air-cooling island first, take waterproof measures, and then run the flushing cart to the area above the air-cooling fan to perform positioning and flushing operations on the air-cooling hot fins. Utility Model Content

[0005] The purpose of the utility model is to provide an automatic flushing device for an air-cooled radiator tube bundle, to realize fully automatic and positionable cleaning operations of the air-cooled radiator, to automatically adapt to the operation of the air-cooled island to perform positioning flushing of the upper radiator tube bundle after a single air-cooled fan is shut down, thereby greatly improving work efficiency, reducing safety hazards for operators, ensuring the heat exchange efficiency of the air-cooled island, reducing the exhaust vacuum of the turbine, improving the overall working efficiency of the turbine, and realizing the production capacity efficiency of the generator set.

[0006] The technical solution adopted by the utility model to achieve the above-mentioned purpose is:

[0007] The invention discloses an automatic flushing device for an air-cooled radiator tube bundle, comprising a travelling carriage, a flushing trolley, a travelling carriage stepping motor, a flushing trolley stepping motor, a travelling carriage limit switch, a flushing trolley limit switch and a control box.

[0008] The trolley is arranged above the radiator tube bundle, and the trolley can reciprocate along the radiator tube bundle frame track. The trolley is driven by the trolley stepper motor, and the trolley stepper motor is electrically connected to the circuit control system through the trolley stepper motor driver, and the trolley limit switches are respectively installed at both ends of the radiator tube bundle frame track; the flushing trolley is arranged on the trolley, and can reciprocate along the trolley track on the trolley, and the flushing trolley is driven by the flushing trolley stepper motor, and the flushing trolley stepper motor is electrically connected to the circuit control system through the flushing trolley stepper motor driver, and the flushing trolley limit switches are respectively installed at both ends of the trolley track; the flushing trolley is also connected to a flushing water pipe, and a flushing water control solenoid valve is provided to realize automatic control of the injection and stop of the flushing water according to demand during the positioning and flushing operation of the radiator tube bundle.

[0009] The circuit control system is set in the control box, including power circuit breaker, PLC controller, stepper motor driver for the carriage, stepper motor driver for the flushing trolley, flushing water control solenoid valve, control conversion switch, button, switch power supply and touch screen. The PLC controller is electrically connected with the stepper motor driver for the carriage, stepper motor driver for the flushing trolley, flushing water control solenoid valve, control conversion switch, button, limit switch and touch screen respectively. The power circuit breaker serves as the main switch of the AC220V power supply of the control box, and the switch power supply provides 24V control power supply for the PLC controller.

[0010] Among them, the PLC controller adopts Siemens PLC200 288-1ST40-0AA0, the stepper motor of the carriage and the stepper motor of the flushing carriage adopt 130BYG2502, the stepper motor driver of the carriage adopts RC2208 and the stepper motor driver of the flushing carriage adopts 20822M, the flushing water control solenoid valve adopts XP-05, the switching power supply adopts 24V switching power supply, and the touch screen adopts Siemens touch screen.

[0011] The beneficial effects of the utility model are:

[0012] This device can efficiently remove dust and stains accumulated in the air-cooled radiator tube bundle, enhance the heat dissipation efficiency of the air-cooled radiator tube bundle, improve the steam turbine extraction vacuum parameters, improve the steam turbine working efficiency and operating stability, reduce the failure rate and increase the service life of the unit; the device adopts a programmable controller to control the stepper motor to drive the gantry trolley and the flushing trolley, which improves the automation level of the flushing device and realizes all-round and fully automatic flushing operations on the air-cooled radiator tube bundle. Through program control, local positioning flushing of the air-cooled radiator tube bundle can also be achieved to avoid water damage to the running motor under the air-cooled radiator tube bundle. Automatic flushing can also reduce the on-site tracking intensity of operators and eliminate the safety hazards of operators working outdoors at high altitudes. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a schematic diagram of the circuit control system of the utility model;

[0015] Figure 3 This is a schematic diagram of the running track of the flushing trolley for flushing all the air-cooled radiator tube bundles according to the utility model;

[0016] Figure 4 It is a schematic diagram of the running track of a flushing trolley for flushing a radiator tube bundle on the upper side of a certain air-cooling fan according to the utility model;

[0017] In the figure, 1, the carriage; 2, the flushing trolley; 3, the stepper motor of the carriage; 4, the stepper motor of the flushing trolley; 5, the limit switch of the carriage; 6, the limit switch of the flushing trolley; 7, the control box; 8, the radiator tube bundle; 9, the frame track; 10, the trolley track; 11, the flushing water pipe; 12, the flushing water solenoid valve; 13, the PLC controller; 14, the stepper motor driver of the carriage; 15, the stepper motor driver of the flushing trolley; 16, the control conversion switch, the button and the limit switch. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the embodiments and drawings:

[0019] like Figure 1 As shown, an automatic flushing device for air-cooled radiator tube bundles includes a traveling carriage 1, a flushing trolley 2, a traveling carriage stepping motor 3, a flushing trolley stepping motor 4, a traveling carriage limit switch 5, a flushing trolley limit switch 6 and a control box 7;

[0020] The carriage 1 is arranged above the air-cooled radiator tube bundle 8, and the carriage 1 can reciprocate along the radiator tube bundle frame track 9. The carriage 1 is driven by the carriage stepper motor 3, and the carriage stepper motor 3 is electrically connected to the circuit control system in the control box 7 through the carriage stepper motor driver, and the carriage limit switches 5 are respectively installed at both ends of the radiator tube bundle frame track 9; the flushing trolley 2 is arranged on the carriage 1, and can reciprocate along the trolley track 10 on the carriage 1, and the flushing trolley 2 is driven by the flushing trolley stepper motor 4, and the flushing trolley stepper motor 4 is electrically connected to the circuit control system in the control box 7 through the flushing trolley stepper motor driver, and the flushing trolley limit switches 6 are respectively installed at both ends of the trolley track 10; the flushing trolley 2 is also connected to a flushing water pipe 11 and a flushing water control solenoid valve 12 for controlling the on and off of the flushing water;

[0021] The circuit control system in the control box 7 is as follows: Figure 2 As shown, it includes a PLC controller 13, a stepper motor driver for a carriage 14, a stepper motor driver for a flushing trolley 15, a flushing water control solenoid valve 12, and a control conversion switch, a button, and a limit switch 16. The PLC controller is electrically connected to the stepper motor driver for the carriage 14, the stepper motor driver for the flushing trolley 15, the flushing water pipe control solenoid valve 12, the control conversion switch, the button, and the limit switch 16 respectively.

[0022] Control switch, button and limit switch 16 as Figure 2 As shown, buttons 110 to 117 respectively control automatic start, automatic stop, manual up, manual down, manual left, manual right, manual automatic conversion, automatic left and right conversion; control conversion switches 120 and 121 control fast and slow conversion; limit switches 122 and 123 are connected to the frame trolley limit switch 5 to control the left and right limits of the frame trolley; limit switches 124 and 125 are connected to the flushing trolley limit switch 6 to control the upper and lower limits of the flushing trolley.

[0023] The touch screen communicates with the PLC controller 13 via a network cable to achieve data exchange, set the control mode, and monitor the operation of the PLC controller and the display of the operating process.

[0024] Among them, the PLC controller 13 adopts Siemens PLC200 288-1ST40-0AA0, the frame trolley stepper motor 3 and the flushing trolley stepper motor 4 adopt 130BYG2502, the frame trolley stepper motor driver 14 adopts RC2208 and the flushing trolley stepper motor driver 15 adopts 20822M, the flushing water control solenoid valve 12 adopts XP-05, the switching power supply adopts 24V switching power supply, and the touch screen adopts Siemens touch screen.

[0025] This device uses the PLC controller motion library instruction output pulse to control the stepper motor driver, thereby controlling the running speed and direction of the stepper motor.

[0026] The programming control in the PLC controller mainly uses the runtime library instructions to realize the stepper motor drive control. After power is supplied, the PLC is powered on, the frame trolley and the washing trolley automatically return to zero position, the frame trolley operation start and stop, the operation direction and speed are controlled, the frame trolley automatically moves and the washing trolley automatically moves back and forth, and the radiator tube bundle on the upper side of the selected air-cooling fan is positioned. The logic is as follows:

[0027] 1) Use runtime library instructions to realize stepper motor drive control;

[0028] Use the motion library instruction AXIS0_MAN in PLC200 to output pulses to Q0.0 to complete the speed control of the stepper motor controller of the carriage, and use M1.3 and Q0.2 to control its running direction. M1.2 is used to control the operation of the motion library instruction AXIS0_MAN, and VD32 controls the number of pulses output by Q0.0 to control the travel speed of the carriage.

[0029] Use the motion library instruction AXIS1_MAN in PLC200 to output pulses to Q0.1 to complete the speed control of the stepper motor controller of the flushing trolley, and use M11.3 and Q0.7 to control its running direction. M11.2 is used to control the running of the motion library instruction AXIS1_MAN, and VD132 controls the number of pulses output by Q0.1 to control the running speed of the flushing trolley.

[0030] Some parameters in the PLC controller motion library:

[0031] The C_Pos parameter contains the current position of the motion axis in pulses (DINT) or engineering units (REAL), depending on the selected measurement unit.

[0032] The VD24 value is the position of the current row rack. For example, if there are 3 air-cooling fans in a row and they move from left to right, the pulse number is 2400. The first fan radiator tube bundle area is 0-800, the second fan radiator tube bundle area is 800-1600, and the third fan radiator tube bundle area is 1600-2400.

[0033] The value of VD124 is the current position of the flushing trolley. The flushing trolley moves from bottom to top throughout the entire process, the number of pulses occurs 880, and the upper and lower areas of the radiator tube bundle are 0-880.

[0034] The C_Speed ​​parameter contains the current speed of the motion axis. Depending on the selected measurement unit, this value is either pulses per second (DINT) or engineering units per second (REAL).

[0035] The C_Dir parameter indicates the current direction: signal state 0 = forward, signal state 1 = reverse.

[0036] 2) After power is supplied, the PLC is powered on, and the carriage and flushing trolley automatically return to zero position;

[0037] When in use, power is supplied to the circuit control system, the PLC is powered on, the PLC controller motion library initiates the return to origin instruction, and controls the frame trolley 1 and the flushing trolley 2 to automatically return to their original positions. Figure 1 As shown, the trolley returns to the leftmost side and the trolley limit switch 5 is activated; the flushing trolley returns to the bottom and the flushing trolley limit switch 6 is activated to calibrate that the trolley and the flushing trolley are at zero position. The values ​​of VD24 and VD124 are both 0 when in the zero position state.

[0038] 3) Then, the start and stop, running direction and speed of the trolley are controlled according to the flushing requirements. The control procedure is as follows:

[0039] The trolley running direction control program: When the trolley starts to the left, M1.0 is 1, and has not started to the right, M1.1 is 0, it is judged that the trolley is moving to the left, M1.3 is 1, which is the positive direction control; M1.3 is 0, which is the reverse direction control.

[0040] When the trolley starts to the left, M1.0 is 1, or starts to the right, M1.1 is 1, then it is judged that the trolley is started, M1.2 is 1, and the control runtime library instruction AXIS0_MAN is running; when the trolley does not start to the left, M1.0 is 0, and does not start to the right, M1.1 is 0, the trolley travel control is stopped.

[0041] Flushing trolley running direction control program: When the flushing trolley starts upward, M11.0 is 1, and does not start downward, M11.1 is 0, then it is judged that the flushing trolley is moving upward, M11.3 is 1, which is positive direction control; in the opposite direction, M11.3 is 0, which is reverse direction control.

[0042] When the flushing trolley starts upward, M11.0 is 1, or starts downward, M11.1 is 1, then it is judged that the flushing trolley is started, M11.2 is 1, and its control runtime library instruction AXIS1_MAN runs; when the flushing trolley does not start upward, M11.0 is 0, and does not start downward, M11.1 is 0, then the flushing trolley movement control is stopped.

[0043] 4) Automatic movement of the carriage and automatic round trip control of the washing trolley;

[0044] When automatic is selected and input I1.0 is automatically started, the automatic movement of the carriage and the automatic round trip control logic of the washing trolley are carried out, and the S0.1 selection logic is entered first.

[0045] Selection logic S0.1: first set M2.0 to 1, execute the rightward control of the carriage, and control the carriage to move right to the next flushing area by time T38. When it is in the flushing area, switch to selection logic S0.2 and stop the movement of the carriage.

[0046] Selection logic S0.2: First, set M2.6 to 1, execute the upward control of the flushing trolley, and determine the uppermost end of the movement based on the position data V124 of the flushing trolley: when V124>880, switch to selection logic S0.3 and stop the movement of the flushing trolley.

[0047] Selection logic S0.3: first set M2.1 to 1, execute the rightward control of the carriage, and control the carriage to move rightward to the flushing area next to it by time T37. When it is in the flushing area, switch to selection logic S0.4 and stop the movement of the carriage.

[0048] Selection logic S0.4: first set M2.4 to 1, execute the downward control of the flushing trolley, and determine the lowest end of movement based on the position data V124 of the flushing trolley: when V124 is less than 0, switch to selection logic S0.1 and stop the movement of the flushing trolley.

[0049] The above four steps are repeated until the flushing area is completely flushed and the loop logic execution is stopped. The left loop flushing operation is the same as above.

[0050] 5) Positioning control of the radiator tube bundle on the upper side of the selected air-cooling fan;

[0051] When positioning and controlling the heat dissipation tube bundle on the upper side of the selected air-cooling fan, taking a row of three air-cooling fans as an example, the touch screen in the control box can be used to set the maintenance full flushing, 1# fan area flushing, 2# fan area flushing, and 3# fan area flushing. The corresponding intermediate quantities of the PLC controller are M5.0, M5.1, M5.2, and M5.3.

[0052] Determination of the flushing area of ​​the radiator tube bundle of the air cooling island:

[0053] When full flushing for inspection is selected, M5.0 is 1, and the rack position VD24 is between 0-2400;

[0054] When the 1# fan zone flushing is selected, M5.1 is 1, and the rack position VD24 is between 0-800;

[0055] When the 2# fan zone flushing is selected, M5.2 is 1, and the rack position VD24 is between 800-1600;

[0056] When the 3# fan zone flushing is selected, M5.3 is 1, and the rack position VD24 is between 1600-2400;

[0057] When one of the above 4 requirements is met, it is determined that the flushing device is in the flushing area, M6.0 is 1, and the automatic movement of the frame trolley and the automatic round-trip control program logic of the flushing trolley are executed.

[0058] The air cooling island radiator tube bundle is not a flushing area.

[0059] When the 1# fan area flushing is selected, M5.1 is 1, and the rack position VD24 is between 800-2400, it is judged that the flushing device is not in the radiator tube bundle area on the upper side of fan 1;

[0060] When the 2# fan area flushing is selected, M5.2 is 1, and the rack position VD24 is between 0-800 or 1600-2400, it is judged that the flushing device is not in the radiator tube bundle area on the upper side of fan 2;

[0061] When the 3# fan area flushing is selected, M5.3 is 1, and the rack position VD24 is between 0-1600, it is judged that the flushing device is not in the radiator tube bundle area on the upper side of fan 3;

[0062] When one of the above 3 is met, the flushing device is judged to be not in the flushing area, and M6.1 is 1. The carriage should always move to the right (left).

[0063] Due to the automatic movement of the carriage and the automatic reciprocating control program logic of the flushing cart, the step program for switching from the carriage to the flushing cart increases the flushing area judgment M6.0 condition. When in the flushing area, M6.0=1, and the reciprocating logic of the carriage and the flushing cart is executed; when not in the flushing area, M6.0=0, and the logic S0.2 is not switched, and the carriage movement right (left) instruction is executed until the carriage moves to the flushing area, and then the reciprocating logic of the carriage and the flushing cart is executed to implement the cleaning operation.

[0064] All air-cooled radiator tube bundles are flushed, and the position trajectory of the flushing trolley is as follows Figure 3 As shown in the figure, if the radiator tube bundle on the upper side of a certain air-cooling fan is flushed, the position trajectory of the flushing trolley is as follows Figure 4 shown.

Claims

1. An automatic flushing device for air-cooled radiator tube bundle, characterized in that: Including the frame trolley, flushing trolley, frame trolley stepper motor, flushing trolley stepper motor, frame trolley limit switch, flushing trolley limit switch and control box; The trolley is arranged above the radiator tube bundle, and can move back and forth along the radiator tube bundle frame track. The trolley is driven by a trolley stepper motor, and the trolley stepper motor is electrically connected to the circuit control system through the trolley stepper motor driver. The trolley limit switches are respectively installed at both ends of the radiator tube bundle frame track. The flushing trolley is arranged on the carriage and can reciprocate along the trolley track on the carriage. The flushing trolley is driven by a flushing trolley stepper motor. The flushing trolley stepper motor is electrically connected to the circuit control system through the flushing trolley stepper motor driver. The two ends of the trolley track are respectively installed with flushing trolley limit switches; the flushing trolley is also connected to a flushing water pipe; A circuit control system is arranged in the control box, and the circuit control system includes a power circuit breaker, a PLC controller, a stepper motor driver for a carriage, a stepper motor driver for a flushing trolley, a flushing water control solenoid valve, a control conversion switch, buttons, limit switches and a touch screen. The PLC controller is electrically connected to the stepper motor driver for the carriage, the stepper motor driver for the flushing trolley, the flushing water control solenoid valve, the control conversion switch, buttons, limit switches and the touch screen respectively.

2. The automatic flushing device for air-cooled radiator tube bundle according to claim 1 is characterized in that: The PLC controller adopts Siemens PLC200 288-1ST40-0AA0, the stepper motor of the carriage and the stepper motor of the flushing carriage adopt 130BYG2502, the stepper motor driver of the carriage adopts RC2208 and the stepper motor driver of the flushing carriage adopts 20822M, the flushing water control solenoid valve adopts XP-05, the switching power supply adopts 24V switching power supply, and the touch screen adopts Siemens touch screen.

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