CN101762206B - Automatic deicing control method of cooling tower fan - Google Patents
Automatic deicing control method of cooling tower fan Download PDFInfo
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- CN101762206B CN101762206B CN 200910273463 CN200910273463A CN101762206B CN 101762206 B CN101762206 B CN 101762206B CN 200910273463 CN200910273463 CN 200910273463 CN 200910273463 A CN200910273463 A CN 200910273463A CN 101762206 B CN101762206 B CN 101762206B
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Abstract
The invention provides an automatic deicing control method of a cooling tower fan, which comprises the following steps: (1) after the timer of a PLC finishes the preparation work for deicing, starting to detect the operating state of the fan, wherein the operating state comprises a high speed running state, a low speed running state and a stop state; (2) if the operating state is the high speed running state, shutting down the fan, delaying for a period of time, and carrying out the next step; if the operating state is the low speed running state, shutting down the fan, delaying for a period of time, and carrying out the next step; if the operating state is the stop state, directly carrying out the next step; (3) carrying out the low-speed reverse rotation deicing for a period of time by using the control system, and carrying out the next step; (4) shutting down the control system, delaying for a period of time and carrying out the next step; (5) switching the control system to the original operating state, and starting the next step; and (6) and while the timer of the PLC waits for the next deicing, returning to step (1). The method can automatically deice for the cooling tower in cold climate, and has the advantage of low cost for operation and maintenance.
Description
Technical field
The present invention relates to cold district blower fan of cooling tower automated de-icing system.
Background technology
In iron and steel metallurgical industry, cooling tower is requisite heat-exchange apparatus in the circular water treating system.Yet at cold district, particularly in the winter time, the icing phenomenon of its blower fan is serious before the cooling tower operation, all brings many difficulties for safety in production and Operation and Maintenance.At China's cold district, can reach 5 wheat harvesting periods local annual ice period, and minimum temperature reaches subzero 40 ℃.Enter winter, it is serious to freeze at cooling tower air inlet shutter, make whole shutter form the ice curtain, almost sealed inlet and outlet, cause the air inlet/outlet incoming air area to reduce, the turnover air quantity reduces, and affects the cooling effect of tower, ice in addition curtain and may throw away in that motor is in service, also have serious potential safety hazard.In order to guarantee normal operation and the cooling effect of cooling tower, common way is to allow the operator make a hole in the ice, but might damage together with shutter in the process of making a hole in the ice, and has caused the significant wastage of human and material resources.In the coldest, even filler is frozen, after filler freezes, affect the efficient of filler, also affect the cooling effect of tower.What is more, and the loading of the ice that increases after freezing may cause distortion on the cooling tower structure, cave in.The anti-icing method of common cooling tower has the methods such as the anti-freeze pipe of installation, shower in the market, but this all needs to increase construction, the operation and maintenance cost of cooling tower.
Summary of the invention
Technical problem to be solved by this invention is: a kind of automatic deicing control method of cooling tower fan is provided, and can be the cooling tower automatic de-icing under cold climate by this method, and the operation and maintenance cost be low.
The technical solution adopted in the present invention is: automatic deicing control method of cooling tower fan may further comprise the steps:
1) after the timer of PLC is finished the preparation of deicing, begins to detect the blower fan duty, be divided into high-speed cruising, low cruise and stop three kinds of states;
2) if high-speed cruising is then shut down and delayed time a period of time, then enter next step; If low cruise is then shut down and delayed time a period of time, then enter next step; If halted state then directly enters next step;
3) described control system is carried out the low speed and reverse deicing, enters next step after continuing for some time;
4) described control system is shut down, and enters next step after time-delay a period of time;
5) described control system is switched to former duty, then begin next step;
6) timer of PLC is waited for next time deicing, returns step 1).
Advantage of the present invention: after using this method, only need in the selected automatic de-icing mode of operation of HMI (actual effect can be come on-the-spot adjustment by setting the blower fan reversing time), the freezing various impacts that cause just can be eliminated by system.It is the damage of making a hole in the ice and may cause equipment that the people had both been avoided in the application of this cover system, has saved manpower and materials, can also prevent from freezing equipment being caused a series of impacts.Compare with other technologies on the market, this programme is simple, and the deicing effect is comparatively obvious, efficiently solves the situation that winter, exclusive cooling tower seriously froze, and has improved the reliability of cooling tower self-operating.
Description of drawings
Fig. 1 is the power loop circuit diagram.
Fig. 2 is running control circuit figure.
Fig. 3 is state and indicating circuit figure.
Fig. 4 is the I/O of PLC system (input and output) some allocation plan.When at the enterprising line operate of HMI (man-machine interface), finish supervision and and on off control to motor status by the input and output point of PLC.
Native system has been realized high-speed cruising, low cruise, three kinds of methods of operation of low speed and reverse operation of double-speed motor, and carries out start stop operation on control box and the HMI (man-machine interface) at the scene.Among the figure, M: double-speed motor; Q: breaker; K: contactor and auxiliary reclay; F: electrothermal relay; T: current transformer; S: selector switch and button; H: indicator lamp; PA: ammeter.
Fig. 5 is flow chart of the present invention.By timing program, which kind of duty pipe blower was not in originally, can regularly allow blower fan of cooling tower automatically switch to the low speed and reverse operation, was back to voluntarily former running status after deicing is finished.
The specific embodiment
The purpose of using cooling tower is to reduce the temperature of water in the tower.Extract the higher air of temperature in the tower by the blower fan forward during every day use, through transmission of heat by contact and evaporative heat loss, airborne heat is pulled away, and water temperature also decreases.And the also source of our deicing system institute calorific requirement just of these heats, when blower fan reverses, the air of high temperature is not directly taken away in the tower, but depressed to diffusion all around by wind-force, hot blast can be discharged to outside the tower through shutter, similar employing hair dryer purges icicle in the tower, thereby reaches good deicing effect, can remove the ice curtain that generates in the cooling tower.This automatic deicing control system adopts the double-speed motor cooperation with the electric control loop of double speed and reverse function, by corresponding control program, makes blower fan of cooling tower can finish the task of automatic de-icing.
Machine system double-speed motor power loop and control loop circuit diagram are not advanced for machine is other in Fig. 1～4, can satisfy 3 kinds of methods of operation of blower fan of cooling tower: the operation of a. high-speed cruising b. low cruise c. low speed and reverse.High-speed cruising reduces water temperature with the air quantity that low cruise can produce different sizes, and low speed and reverse then is that deicing is special-purpose.
The cooling tower automatic deicing control system mainly is comprised of electric control loop and automatic control program two parts:
(1) electric control loop: the hardware environment that is whole system.As shown in drawings, according to the requirement of heat exchange, blower fan of cooling tower generally adopts double-speed motor, minute high speed and low speed.Be on the basis of double-speed motor at this motor, we design the electric control loop with high-speed cruising, low cruise, low speed and reverse operation function, can satisfy by the machine simultaneously, the function of centralized operation switches.
It comprises double-speed motor, MCC (Motor Control Center, Motor Control Center) switch board, PLC (programmable logic controller (PLC)) cabinet, HMI (man-machine interface), field operation box.
The annexation of each parts is: all electrical controls and protecting component have been installed in the MCC switch board, and K01～04 is the operation contactor, and function is as follows separately for it: when K01 is closed, and low cruise; When K02 and K03 are closed, high-speed cruising; When K04 was closed, the low speed and reverse operation had the electrical interlocks function between each running status, had avoided a plurality of contactors while closures and damage equipment.On-the-spot selector switch, button, indicator lamp etc. are installed in the field operation box, are convenient at the scene double-speed motor be operated.Selector switch can to by the machine, centralized operation switches, and when maintenance or on-the-spot emergency, selector switch is threaded to the other operation of machine, this moment, blower fan of cooling tower was in the other manual state of a control of machine fully, not affected by any of PLC equipment and program.When selector switch is threaded to centralized operation, blower fan of cooling tower can carry out at HMI the operations such as manual start and stop, automatic de-icing.
(2) automatic control program: generally just need to carry out deicing operation in the season of cold every 24 hours.Do not need human intervention for the purpose that reaches automatic de-icing, finish automatic control task with the logic control program of PLC.After selecting the automatic de-icing pattern at HMI, program flow diagram as shown in Figure 5.
Generally, double-speed motor the state of counter-rotating before the deicing nothing more than in high-speed cruising, low cruise, stop three kinds of states.For avoiding that double-speed motor is caused damage, we switch and directly switch can not be at motor rotation the time carrying out rotating, and must shut down first and fully static through the motors such as delay of certain hour after could change again direction and start.When preparation beginning deicing is finished in the program timing; can detect first present motor is in which kind of duty (at a high speed, low speed or stop) and records this duty; then shut down and leave standstill after remaining static fully (at a high speed different with the time of repose of low speed such as motor in operation; can set according to actual conditions); open motor to low speed and reverse, the beginning deicing.Program autostop after deicing in about 30 minutes is finished, and on request motor is switched to former duty.This program is the Automatic Control program, does not need to think intervention fully.After using this control system, only need in the selected automatic de-icing mode of operation of HMI (actual effect can be come on-the-spot adjustment by setting the blower fan reversing time), the freezing various impacts that cause just can be eliminated by system.It is the damage of making a hole in the ice and may cause equipment that the people had both been avoided in the application of this cover system, has saved manpower and materials, can also prevent from freezing equipment being caused a series of impacts.Compare with other technologies on the market, this programme is simple, and the deicing effect is comparatively obvious, efficiently solves the situation that winter, exclusive blower fan of cooling tower blade seriously froze, and has improved effect and the reliability of cooling tower self-operating.
Be described in further detail the present invention below in conjunction with embodiment.
As shown in Figure 1, automatic deicing control system of cooling tower fan comprises double-speed motor M, MCC switch board and PLC; Three-phase electrical source of power (alternating current 380V, phase line L1, L2, L3) is connected to double-speed motor M, and its power loop is equipped with current transformer Ta, Tc and Ta1, Tc1, and MCC is the corresponding ammeter that is equipped with cashier's office in a shop, can show running current cashier's office in a shop at MCC.Electric Machine Control can be divided into the other and concentrated two kinds of control modes of machine, and the other control box of machine is installed in device context, moves by the button control motor on the control box; HMI is placed on the control room, by the operation of PLC control motor.
Three phase line L1, L2 of three-phase electrical source of power, L3 are divided into three the tunnel after by circuit breaker Q 01, and the first via is that contactor K01 often leaves main contact and is connected to double-speed motor M (earth connection PE, three- phase 1U, 1V, 1W), the control low cruise; The second the tunnel is that contactor K04 often leaves main contact and is connected to double-speed motor M (earth connection PE, three- phase 1U, 1V, 1W), the operation of control low speed and reverse; Third Road is controlled to realize by K02 and two contactors of K03, contactor K02 often leaves main contact and is connected to double-speed motor M (earth connection PE, three- phase 2U, 2V, 2W), the K03 contactor is closed simultaneously realizes that the motor internal wiring becomes Y-Y connection by delta connection, thereby realizes the high-speed cruising control of motor.
Be installed in current transformer Ta, Tc on the power loop and Ta1, the Tc1 electric current after with conversion and send into respectively electrothermal relay F01 thermal element, ammeter PA and electrothermal relay F02 thermal element, ammeter PA1, reach the purpose that overload protection and electric current show.
As shown in Figures 2 and 3, two line traffic control power supply (alternating current 220V, phase line L, zero line N) is connected to the MCC switch board by circuit breaker Q 11, comprises low cruise control loop, low speed and reverse operation control loop, high-speed cruising control loop, winding switching controls loop, low speed SBR control loop, high speed SBR control loop, Fault Control loop, indicating fault control loop in the MCC switch board, stop to indicate control loop, low cruise to indicate control loop, low speed and reverse operation indication control loop and high-speed cruising indication control loop.
Be connected between two lines of two line traffic control power supplys:
Drawing a branch road between the contact 5 with the button S3 of normally closed interlock and universal seclector S6 in the low cruise control loop is connected to contactor K04 and often opens auxiliary contact, draw a branch road between the contact 2 of universal seclector S6 and the button S1 with normally open contact and be connected to button S2 with normally open contact, draw a branch road between the contact 6 of universal seclector S6 and relay K 20 normally open contacts and be connected to relay K 21 normally open contacts, after converging, pass through successively again these three branch roads the normally closed auxiliary contact of contactor K01, contactor K04 coil, control loop is moved as low speed and reverse in this loop;
With the button S1 of normally open contact, with the button S2 of normally open contact, with the button S3 of normally closed interlock, with the button S4 of normally open contact, be positioned at field operation box with button S5, the universal seclector S6 of normally closed interlock;
Draw a branch road between the normally closed auxiliary contact of contactor K04 of high-speed cruising control loop and the contactor K02 coil and be connected to contactor K03 coil, this loop is as winding switching controls loop;
Circuit breaker Q 01 auxiliary contact 0F, electrothermal relay F01 normally closed interlock, relay K 11 coils of connecting successively, this loop is as the lower-speed state control loop;
Draw a branch road between the circuit breaker Q 01 auxiliary contact 0F of lower-speed state control loop and the electrothermal relay F01 normally closed interlock, this branch road is connected to electrothermal relay F02 normally closed interlock, relay K 12 coils successively, and this loop is as the fast state control loop;
Circuit breaker Q 01 Alarm contactor SD, electrothermal relay F01 normally open contact, electrothermal relay F02 normally open contact in parallel are connected to relay K 10 coils after these three branch roads converge again, and this loop is as the Fault Control loop;
Then the normally closed auxiliary contact of contactor K01, the normally closed auxiliary contact of K02, the normally closed auxiliary contact of K04 of series connection are connected to indicator lamp H1 and H2 in parallel, and this loop is as stopping to indicate control loop;
Contactor K01 often leaves auxiliary contact and is connected to indicator lamp H2 and H3 in parallel, and control loop is indicated as low cruise in this loop;
Contactor K04 often leaves auxiliary contact and is connected to indicator lamp H3 and H4 in parallel, and this loop is as low speed and reverse operation indication control loop;
The contactor K02 of series connection often leaves auxiliary contact, K03 and often opens auxiliary contact, is connected to indicator lamp H4 and H5 in parallel again, and control loop is indicated as high-speed cruising in this loop;
Indicator lamp H1, H2, H3 and H4 are positioned at field operation box.
As shown in Figure 4, PLC comprises two modules (Siemens PLC C input/output module-ASI module) ASI1 and ASI2.NC1 among the figure～normally closed pin of 3 expressions, C1～3 expression common pin, pin is often opened in N01～3 expressions, IN1～4 expression signal input pins.
The pin 14 and 15 of modules A SI1 is connected to relay K 20 coils, pin 17 and 18 is connected to relay K 21 coils, pin 19 and 20 is connected to relay K 22 coils, be connected to relay relay K 10 normally open contacts between the pin 2 and 8, be connected to contactor K01 between the pin 3 and 9 and often open auxiliary contact, be connected to contactor K04 between the pin 5 and 11 and often open auxiliary contact, the contactor K02 that is connected to series connection between the pin 6 and 12 often opens auxiliary contact, K03 and often opens auxiliary contact;
The pin 8 and 9 of modules A SI2 is connected to relay K 23 coils, and pin 10 and 11 is connected to relay K 24 coils, is connected to relay K 11 normally open contacts between the pin 5 and 2, is connected to relay K 12 normally open contacts between the pin 6 and 3.
As shown in Figure 5, the using method of automatic deicing control system of cooling tower fan may further comprise the steps:
1) after the timer of PLC is finished the preparation of deicing, begins to detect the blower fan duty, be divided into high-speed cruising, low cruise and stop three kinds of states;
2) if high-speed cruising is then shut down and delayed time a period of time, then enter next step; If low cruise is then shut down and delayed time a period of time, then enter next step; If halted state then directly enters next step;
3) described control system is carried out the low speed and reverse deicing, enters next step after continuing for some time;
4) described control system is shut down, and enters next step after time-delay a period of time;
5) described control system is switched to former duty, then begin next step;
6) timer of PLC is waited for next time deicing, returns step 1).
The below is described in further detail its using method.
At first with circuit breaker Q 01, Q11 main contact closure, system's energising; Then enter step 1);
Step 1) method of system high-speed operation is divided into centralized operation and the other operation of machine; The method of centralized operation is: the contact 11 of universal seclector S6,12 is connected, with relay K 23 coil electricities of PLC modules A SI2, if must stop then relay K 24 coil electricities with PLC modules A SI2; The method of the other operation of machine is: the contact 7,8 of universal seclector S6 connected, then will be closed with the button S4 of normally open contact, and if must stop then button S4 to be disconnected, the shutdown delay time of high-speed cruising is 600s.
The method of system's low cruise is divided into centralized operation and the other operation of machine; The method of centralized operation is: the contact 5 of universal seclector S6,6 is connected, with relay K 20 coil electricities of PLC modules A SI1, if must stop then relay K 22 coil electricities with PLC modules A SI1; The method of the other operation of machine is: first the contact 1,2 of universal seclector S6 connected, again will be closed with the button S1 of normally open contact, and if must stop then button S1 to be disconnected, the shutdown delay time of low cruise is 300s.
Step 2) method of low speed and reverse operation is divided into centralized operation and the other operation of machine; The method of centralized operation is: the contact 5 of universal seclector S6,6 is connected, with relay K 21 energisings of PLC modules A SI1, if must stop then relay K 22 coil electricities with PLC modules A SI1; The method of the other operation of machine is: the contact 1,2 of universal seclector S6 connected, and again that button S2 is closed, then button S2 is disconnected if must stop.
Step 3) duration of low speed and reverse deicing is 1800s.
Step 4) shutting down delay time is 300s.
Claims (3)
1. automatic deicing control method of cooling tower fan is characterized in that may further comprise the steps:
1) after the timer of PLC is finished the preparation of deicing, begins to detect the blower fan duty, be divided into high-speed cruising, low cruise and stop three kinds of states;
2) if high-speed cruising is then shut down and delayed time a period of time, then enter next step; If low cruise is then shut down and delayed time a period of time, then enter next step; If halted state then directly enters next step;
3) automatic deicing control system of cooling tower fan carries out the low speed and reverse deicing, enters next step after continuing for some time;
4) automatic deicing control system of cooling tower fan is shut down, and enters next step after time-delay a period of time;
5) automatic deicing control system of cooling tower fan is switched to former duty, then begin next step;
6) timer of PLC is waited for next time deicing, returns step 1).
2. method according to claim 1, it is characterized in that: the method is used at automatic deicing control system of cooling tower fan, and this system comprises double-speed motor M, MCC switch board and PLC; The three-phase electrical source of power is connected to double-speed motor M, also is connected to the MCC switch board by current transformer on the powered wire between three-phase electrical source of power and the double-speed motor M, is connected to field operation box and PLC on the MCC switch board;
Three phase line L1, L2 of described three-phase electrical source of power, L3 are divided into two-way after by circuit breaker Q 01, the contactor K01 of leading up to often opens main contact and is connected to double-speed motor M, another road is often opened main contact by contactor K02 and is connected to double-speed motor M, also is connected to respectively current transformer T on this two-way powered wire
a, T
cAnd T
A1, T
C1, the two ends of contactor K01 are connected to the reverse contactor K04 of three-phase and often open main contact, and contactor K01 often leaves and also is connected to the three contactor K03 that are connected together between main contact and the double-speed motor M and often opens main contact;
Described current transformer T
a, T
cBe connected to MCC switch board, T by electrothermal relay F01 thermal element, ammeter PA
A1, T
C1Be connected to the MCC switch board by electrothermal relay F02 thermal element, ammeter PA1;
Two line traffic control power supplys are connected to the MCC switch board by circuit breaker Q 11, comprise low cruise control loop, low speed and reverse operation control loop, high-speed cruising control loop, winding switching controls loop, low speed SBR control loop, high speed SBR control loop, Fault Control loop, indicating fault control loop in the MCC switch board, stop to indicate control loop, low cruise to indicate control loop, low speed and reverse operation indication control loop and high-speed cruising indication control loop;
Be connected between two lines of described two line traffic control power supplys:
Relay K 10 normally closed interlocks, the normally closed auxiliary contact of contactor K03, relay K 11 normally open contacts, the K22 normally closed interlock of contacting successively; Then be connected to field operation box, at first be by the button S3 with normally closed interlock, then be divided into three the tunnel, one the tunnel is connected to contactor K01 often opens auxiliary contact, another road is connected to the contact 1,2 and with the button S1 of normally open contact of universal seclector S6, Third Road is connected to the contact 5,6 and relay K 20 normally open contacts of universal seclector S6, this three the tunnel converge after more successively by the normally closed auxiliary contact of contactor K04, contactor K01 coil, this loop is as the low cruise control loop;
Drawing a branch road between the contact 5 with the button S3 of normally closed interlock and universal seclector S6 in the low cruise control loop is connected to contactor K04 and often opens auxiliary contact, draw a branch road between the contact 2 of universal seclector S6 and the button S1 with normally open contact and be connected to button S2 with normally open contact, draw a branch road between the contact 6 of universal seclector S6 and relay K 20 normally open contacts and be connected to relay K 21 normally open contacts, after converging, pass through successively again these three branch roads the normally closed auxiliary contact of contactor K01, contactor K04 coil, control loop is moved as low speed and reverse in this loop;
Relay K 10 normally closed interlocks, draw a branch road between the normally closed auxiliary contact of contactor K03, again successively by relay K 12 normally open contacts, the K24 normally closed interlock, be divided into three the tunnel behind the button S5 with normally closed interlock, one the tunnel is connected to contactor K02 often opens auxiliary contact, another road is connected to the contact 7 of universal seclector S6 successively, 8 and with the button S4 of normally open contact, Third Road is connected to the contact 11 of universal seclector S6 successively, 12 and relay K 23 normally open contacts, this three the tunnel converge after more successively by the normally closed auxiliary contact of contactor K01, the normally closed auxiliary contact of contactor K04, contactor K02 coil, this loop is as the high-speed cruising control loop;
With the button S1 of normally open contact, with the button S2 of normally open contact, with the button S3 of normally closed interlock, with the button S4 of normally open contact, be positioned at field operation box with button S5, the universal seclector S6 of normally closed interlock;
Draw a branch road between the normally closed auxiliary contact of contactor K04 of high-speed cruising control loop and the contactor K02 coil and be connected to contactor K03 coil, this loop is as winding switching controls loop;
Circuit breaker Q 01 auxiliary contact OF, electrothermal relay F01 normally closed interlock, relay K 11 coils of connecting successively, this loop is as the lower-speed state control loop;
Draw a branch road between the circuit breaker Q 01 auxiliary contact OF of lower-speed state control loop and the electrothermal relay F01 normally closed interlock, this branch road is connected to electrothermal relay F02 normally closed interlock, relay K 12 coils successively, and this loop is as high speed SBR control loop;
Circuit breaker Q 01 Alarm contactor SD, electrothermal relay F01 normally open contact, electrothermal relay F02 normally open contact in parallel are connected to relay K 10 coils after these three branch roads converge again, and this loop is as the Fault Control loop;
Relay K 10 normally open contacts, the indicator lamp H1 of series connection, this loop is as the indicating fault control loop;
Then the normally closed auxiliary contact of contactor K01, the normally closed auxiliary contact of K02, the normally closed auxiliary contact of K04 of series connection are connected to indicator lamp H1 and H2 in parallel, and this loop is as stopping to indicate control loop;
Contactor K01 often leaves auxiliary contact and is connected to indicator lamp H2 and H3 in parallel, and control loop is indicated as low cruise in this loop;
Contactor K04 often leaves auxiliary contact and is connected to indicator lamp H3 and H4 in parallel, and this loop is as low speed and reverse operation indication control loop;
The contactor K02 of series connection often leaves auxiliary contact, K03 and often opens auxiliary contact, is connected to indicator lamp H4 and H5 in parallel again, and control loop is indicated as high-speed cruising in this loop;
Indicator lamp H1, H2, H3 and H4 are positioned at field operation box;
Described PLC comprises PLC input/output module ASI1 and ASI2;
The pin 14 and 15 of modules A SI1 is connected to relay K 20 coils, pin 17 and 18 is connected to relay K 21 coils, pin 19 and 20 is connected to relay K 22 coils, be connected to relay K 10 normally open contacts between the pin 2 and 8, be connected to contactor K01 between the pin 3 and 9 and often open auxiliary contact, be connected to contactor K04 between the pin 5 and 11 and often open auxiliary contact, the contactor K02 that is connected to series connection between the pin 6 and 12 often opens auxiliary contact, K03 and often opens auxiliary contact;
The pin 8 and 9 of modules A SI2 is connected to relay K 23 coils, and pin 10 and 11 is connected to relay K 24 coils, is connected to relay K 11 normally open contacts between the pin 5 and 2, is connected to relay K 12 normally open contacts between the pin 6 and 3;
Described automatic deicing control method of cooling tower fan is at first with circuit breaker Q 01, Q11 main contact closure, system's energising; Then enter step 1);
The method of step 1) system high-speed operation is divided into centralized operation and the other operation of machine; The method of centralized operation is: the contact 11 of universal seclector S6,12 is connected, with relay K 23 coil electricities of PLC modules A SI2, if must stop then relay K 24 coil blackouts with PLC modules A SI2; The method of the other operation of machine is: the contact 7,8 of universal seclector S6 connected, then will be closed with the button S4 of normally open contact, and if must stop then button S4 to be disconnected, again the contact 9,10 of universal seclector S6 is connected;
The method of step 1) system low cruise is divided into centralized operation and the other operation of machine; The method of centralized operation is: the contact 5 of universal seclector S6,6 is connected, with relay K 20 coil electricities of PLC modules A SI1, if must stop then relay K 22 coil blackouts with PLC modules A SI1; The method of the other operation of machine is: first the contact 1,2 of universal seclector S6 connected, again will be closed with the button S1 of normally open contact, and if must stop then button S1 to be disconnected, again the contact 3,4 of universal seclector S6 is connected;
The method of step 3) low speed and reverse operation is divided into centralized operation and the other operation of machine; The method of centralized operation is: the contact 5 of universal seclector S6,6 is connected, with relay K 21 energisings of PLC modules A SI1, if must stop then relay K 22 coil blackouts with PLC modules A SI1; The method of the other operation of machine is: the contact 1,2 of universal seclector S6 connected, and again that button S2 is closed, if must stop then button S2 to be disconnected, again the contact 3,4 of universal seclector S6 is connected.
3. method according to claim 1 and 2 is characterized in that: step 2) the shutdown delay time of high-speed cruising is 600s, the shutdown delay time of low cruise is 300s; The duration of step 3) low speed and reverse deicing is 1800s; It is 300s that step 4) is shut down delay time.
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| CN 200910273463 CN101762206B (en) | 2009-12-29 | 2009-12-29 | Automatic deicing control method of cooling tower fan |
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| CN 200910273463 CN101762206B (en) | 2009-12-29 | 2009-12-29 | Automatic deicing control method of cooling tower fan |
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| CN102338591B (en) * | 2010-07-29 | 2012-12-12 | 河南省电力勘测设计院 | Automatic deicing device of natural draft cooling tower and deicing method thereof |
| CN114216049B (en) * | 2021-11-18 | 2023-09-22 | 中核检修有限公司 | Gas insulation medium filling device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1532483A (en) * | 2003-03-18 | 2004-09-29 | 维 储 | Defrosting device of air heat exchanger |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1532483A (en) * | 2003-03-18 | 2004-09-29 | 维 储 | Defrosting device of air heat exchanger |
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| Publication number | Publication date |
|---|---|
| CN101762206A (en) | 2010-06-30 |
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Effective date of registration: 20151119 Address after: 226251, Jiangsu, Nantong, Qidong City, Hopewell Town, sea bridge Patentee after: CAO SHUQIN Address before: 430223 Hubei city of Wuhan province East Lake New Technology Development Zone, University Road No. 33 Patentee before: WISDRI Engineering & Research Incorporation Limited |
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