CN110296572B - Defrosting method and defrosting device applied to outdoor air suction opening of fan in severe cold area - Google Patents
Defrosting method and defrosting device applied to outdoor air suction opening of fan in severe cold area Download PDFInfo
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- CN110296572B CN110296572B CN201910594288.2A CN201910594288A CN110296572B CN 110296572 B CN110296572 B CN 110296572B CN 201910594288 A CN201910594288 A CN 201910594288A CN 110296572 B CN110296572 B CN 110296572B
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- defrosting
- air
- air suction
- fan
- suction resistance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/004—Control mechanisms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/065—Removing frost by mechanical means
Abstract
The invention discloses a defrosting method applied to an outdoor air suction opening of a fan in a severe cold area, which comprises the following steps: detecting the actual temperature T1 of the air suction opening; when the actual temperature T1 is less than or equal to the preset temperature T, detecting the air suction resistance and the air intake of the air duct of the fan; when the air suction resistance detection value is continuously increased and the air intake detection value is continuously decreased, timing is started, the air suction resistance and the air intake of the air duct of the fan are continuously detected, and the continuous detection time is t; and if the detection value of the air suction resistance, the detection value of the air inlet quantity or the changes of the air suction resistance and the air inlet quantity meet the defrosting requirement, controlling the defrosting mechanism to execute one defrosting action. Also discloses a defrosting device, which comprises a fan, a temperature detector, an air suction resistance detector, an air inlet amount detector, a defrosting mechanism, a timer and a controller. The invention realizes effective and intelligent defrosting, achieves good defrosting effect and ensures the reliable operation of the fan, the boiler equipment and the generator set.
Description
Technical Field
The invention relates to the technical field of defrosting, in particular to a defrosting method and a defrosting device applied to an outdoor air suction opening of a fan in a severe cold area.
Background
The air system of the thermal power plant is mainly used for conveying and drying fuel required by boiler combustion, supplying a large amount of air required by fuel combustion, and overcoming system resistance of the air required by fuel combustion in air preheaters, pulverized coal equipment, combustion equipment, air ducts and the like. Therefore, the design of the air system is focused on selecting a fan with proper capacity, optimizing the inlet and outlet flow fields of the fan, reducing adverse conditions on the working operation and performance efficiency of the fan, maintaining reasonable medium flow and flow rate and adopting reasonable smoke air duct arrangement to reduce system resistance. However, in severe cold areas (such as Xinjiang areas), due to specific meteorological environmental conditions, the fan sucks air outdoors in winter, the frosting phenomenon can be generated at the air suction opening, and when the frosting is serious, the local part or even the whole air suction opening is occupied by the frost, so that the air duct is blocked, the air quantity is reduced, and the operation and the safety of the fan and the host machine equipment are directly influenced. Therefore, defrosting of the outdoor suction opening is necessary.
Disclosure of Invention
The invention aims to provide a defrosting method and a defrosting device applied to an outdoor suction opening of a fan in a severe cold area, and solve the problem that the fan opening of an air system of a thermal power plant is frosted.
The technical scheme adopted by the invention for solving the technical problem is as follows: the defrosting method applied to the outdoor air suction opening of the fan in the severe cold area comprises the following steps:
A. detecting the actual temperature T1 of the pipe wall of the air suction inlet of the fan;
B. when the actual temperature T1 is less than or equal to the preset temperature T, detecting the air suction resistance and the air intake of an air duct at the inlet of the fan;
C. when the air suction resistance detection value is continuously increased and the air intake detection value is continuously reduced, timing is started, the air suction resistance and the air intake of the air duct at the inlet of the fan are continuously detected, the continuous detection duration is t, and the change conditions of the air suction resistance and the air intake from the beginning to the end of the continuous detection are recorded;
D. if the detection value of the air suction resistance, the detection value of the air inlet quantity or the changes of the air suction resistance and the air inlet quantity meet the defrosting requirement, controlling a defrosting mechanism to execute a defrosting action, and repeating the steps A to D after executing the defrosting action; and D, if the detection value of the air suction resistance, the detection value of the air intake quantity or the changes of the air suction resistance and the air intake quantity do not meet the defrosting requirement, repeating the steps A to D.
Further, the preset temperature T is 0 ℃.
Further, in the step C, the duration t of the continuous detection of the air suction resistance and the intake air amount is 30 min.
Further, in the step D, when the detection value of the air suction resistance is 10% of the pressure head of the fan, a defrosting action is executed; when the detection value of the air inlet quantity is 10% of the air quantity of the fan, a defrosting action is executed; and if the air suction resistance is continuously increased and the air intake is continuously reduced from the beginning to the end of the continuous detection, executing a defrosting action.
Furthermore, the defrosting mechanism is a vibrating mechanism, and the vibrating mechanism vibrates for 5min during defrosting each time.
Be applied to defroster of outdoor inlet scoop of severe cold area fan, including fan, thermodetector, air suction resistance detector, intake detector, defrosting mechanism, time-recorder and controller, thermodetector, air suction resistance detector and intake detector all install in the inlet scoop of fan, and thermodetector, air suction resistance detector and intake detector, defrosting mechanism and time-recorder all link to each other with the controller.
Furthermore, the defrosting mechanism is a vibration mechanism, and the vibration mechanism is installed on the outer wall of the air duct at the inlet of the fan.
Furthermore, the air suction resistance detector is a pressure sensor, and the air intake detector is a flow sensor.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, by recording and detecting the defrosting influence parameters and reasonably setting the defrosting conditions, when the defrosting influence parameters meet the preset defrosting conditions, the defrosting mechanism acts, so that false defrosting and frequent defrosting can be avoided, and the defrosting period under the severe frosting environment is shortened, thus effective and intelligent defrosting is realized, a good defrosting effect is achieved, and reliable operation of a fan, boiler equipment and a generator set is ensured.
Drawings
FIG. 1 is a schematic flow diagram of a defrosting method;
FIG. 2 is a schematic view of a defrosting apparatus;
reference numerals: 1-a temperature detector; 2-a suction resistance detector; 3-an intake detector; 4-a defrosting mechanism; 5, a controller; 6, a timer; 100-fan inlet duct.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The invention discloses a defrosting method applied to an outdoor suction opening of a fan in a severe cold area, which comprises the following steps as shown in figure 1:
A. and detecting the actual temperature T1 of the pipe wall of the air suction opening of the fan. After the blower is started up, the actual temperature T1 of the pipe wall of the air suction opening can be detected. The detection of actual temperature T1 adopts temperature detector 1, specifically can be present various temperature sensor, and temperature detector 1 installs in the wind channel of fan, and the distance is about 200mm from the inlet scoop. When the temperature of the external environment is higher and obviously higher than the frosting temperature, the frosting phenomenon basically does not exist, and the temperature detector 1 can be closed to save energy consumption; when the external environment decreases, the temperature detector 1 is turned on to perform detection.
B. When the actual temperature T1 is less than or equal to the preset temperature T, the suction resistance and the intake air volume of the fan inlet duct 100 are detected. When the external environment is reduced, the possibility of frost formation is increased, generally speaking, when the temperature of the pipe wall of the air suction inlet is lower than the dew point temperature, condensed water is generated on the pipe wall, and if the temperature of the pipe is further lower than the dew point temperature, the condensed water is changed into frost to be attached to the pipe wall. The dew point temperature is generally about 0 degrees celsius, and therefore, the preset temperature T is set to 0 degrees celsius, but of course, the preset temperature T may also be set to be slightly higher than 0 degrees celsius or lower than 0 degrees celsius according to local geographical conditions. When the actual temperature T1 is reduced to the preset temperature T, a frosting phenomenon may occur at the air suction port of the fan, and at this time, a defrosting preparation needs to be made. After frosting, the air suction resistance of the air duct 100 at the fan inlet is increased, and at the same time, the air intake is reduced, and the air suction resistance and the air intake are also important indexes influencing the performance of the fan, so that the invention adopts two parameters of the air suction resistance and the air intake as the judgment basis for judging whether defrosting is needed.
C. Continuously detecting the air suction resistance and the air intake of the air duct 100 at the inlet of the fan, wherein under the condition of no frost formation or no increase of the frost formation, the air suction resistance and the air intake can be kept stable and the fluctuation is small, when the temperature is low and the frost formation is increased gradually, the air suction resistance can be continuously increased and the air intake can be continuously reduced, therefore, the judgment is carried out according to the detection result, when the air suction resistance and the air intake are kept stable and the fluctuation is small, the air suction opening of the fan is not frosted or the frost formation is not increased, when the air suction resistance detection value is continuously increased and the air intake detection value is continuously reduced, the frost formation is continuously increased, at the moment, the timing is started, the air suction resistance and the air intake of the air duct 100 at the inlet of the fan are continuously detected, the continuous detection time is t, and the change conditions of the air suction resistance and the air intake from, specifically, a curve of the variation of the air suction resistance and the air intake with the detection time within the continuous detection duration t can be drawn. The continuous detection duration t is determined according to the local air temperature change, and may be 10min, 20min, 30min, 40min, 50min, and the like.
D. If the detection value of the air suction resistance, the detection value of the air inlet amount or the changes of the air suction resistance and the air inlet amount reach the defrosting requirement, the defrosting mechanism is controlled to execute a defrosting action, and the defrosting requirement can be that:
1. when the detection value of the air suction resistance is 10% of the pressure head of the fan, one defrosting action is executed. When the actual temperature T1 equals to the preset temperature T, the air suction resistance of the fan inlet air duct 100 starts to be detected, and in the detection process, no matter which moment, no matter whether the detection value of the air suction resistance fluctuates, as long as the detection value of the air suction resistance is 10% of the fan pressure head, the defrosting action is executed. When the suction resistance reaches 10% of the blower head, the efficiency of the blower is seriously affected, and the load of the blower is increased, so that the defrosting needs to be performed immediately to reduce the resistance.
2. When the detection value of the air intake is 10% of the air volume of the fan, a defrosting action is executed. When the actual temperature T1 is equal to the preset temperature T, the air intake of the fan starts to be detected, and in the detection process, no matter which moment, no matter whether the detection value of the air intake fluctuates, the defrosting action is executed as long as the detection value of the air intake is 10% of the air volume of the fan. When the detection value of the air intake is 10% of the air volume of the fan, the frosting phenomenon is very serious, and the air volume of the fan cannot meet the requirement, so that the defrosting must be carried out immediately.
3. And if the air suction resistance is continuously increased and the air intake is continuously reduced from the beginning to the end of the continuous detection, executing a defrosting action. If the air suction resistance is continuously increased and the air intake is continuously reduced, the frosting amount is continuously increased within the continuous detection duration time t, and if the air supply without the fan is continuously increased, the defrosting can be carried out.
Among the above 3 defrosting requirements, the defrosting requirements 1 and 2 are for the condition that the air suction opening of the fan has a large amount of frost before starting, or the amount of frost after starting the fan is increased rapidly and needs to be defrosted immediately. The defrosting requirement 3 is for the condition that the frosting speed is not fast after the fan is started. It is understood that defrosting may also be performed during the execution of steps B and C, and thus steps B, C and D are executed in conjunction with each other, not in sequence.
After the defrosting action is executed once, the steps A to D are repeated, so that continuous detection and defrosting can be realized, a good defrosting effect is ensured, the operation load of the fan is reduced, and the reliable operation of the fan is ensured.
And similarly, if the detection value of the air suction resistance, the detection value of the air intake or the changes of the air suction resistance and the air intake do not meet the defrosting requirement, repeating the steps A to D to realize continuous detection and defrosting.
The defrosting mechanism is a vibrating mechanism, and the vibrating mechanism vibrates for 5min each time defrosting is carried out. The vibration mechanism vibrates according to certain frequency, can shake off the frost of inlet scoop. In addition, the defrosting mechanism can be a mechanism for providing hot air, such as a hot air fan, and the hot air fan generates hot air after being electrified, so that the hot air is blown to an air suction port of the fan to promote the melting of frost.
Be applied to defroster of outdoor inlet scoop of severe cold district fan, as shown in fig. 2, including fan, thermodetector 1, induced draft resistance detector 2, intake rate detector 3, defrosting mechanism 4, time-recorder 6 and controller 5, thermodetector 1, induced draft resistance detector 2 and intake rate detector 3 all install in the inlet scoop of fan, and thermodetector 1, induced draft resistance detector 2 and intake rate detector 3, defrosting mechanism 4 and time-recorder 6 all link to each other with controller 5.
The temperature detector 1 is used for detecting the actual temperature T1 of the pipe wall of the air suction opening of the fan, and can be various existing temperature sensors, and the temperature detector 1 is installed in an air duct 100 of the air inlet of the fan and is about 200mm away from the air suction opening. The air suction resistance detector 2 is used for detecting air suction resistance of the fan, a pressure sensor can be adopted, the air intake detector 3 is used for detecting air intake of the fan, a flow sensor can be adopted, and the air suction resistance detector 2 and the air intake detector 3 are arranged in the fan inlet air duct 100. The defrosting mechanism 4 is used for defrosting, and may be a vibration mechanism, such as a vibration motor, and the vibration mechanism is installed on the outer wall of the fan inlet air duct 100 and is 500 to 1000mm away from the air suction opening.
The temperature detector 1 transmits the detected actual temperature T1 to the controller 5, the controller 5 compares the actual temperature T1 with the preset temperature T, when the actual temperature T1 is less than or equal to the preset temperature T, the air suction resistance detector 2 and the air intake detector 3 are controlled to be electrified, the air suction resistance detector 2 detects air suction resistance and transmits a detection result to the controller 5, the air intake detector 3 detects air intake and transmits the detection result to the controller 5, the controller 5 receives and processes the detection result, when the air suction resistance is continuously increased and the air intake is continuously increased, the timer 6 is controlled to start timing, and meanwhile, the air suction resistance detector 2 and the air intake detector 3 continuously detect.
In the process, as long as the detection value of the air suction resistance is 10% of the pressure head of the fan, or the detection value of the air intake is 10% of the air volume of the fan, the controller 5 controls the vibration mechanism to vibrate for 5min according to a certain frequency, the timer 6 and other detection data are cleared after vibration, and the temperature detector 1 starts to detect the actual temperature T1 again.
The timer 6 starts to count time to finish timing, if the defrosting action is not executed, the controller 5 analyzes the change rule of the air suction resistance and the air intake in the time period counted by the timer 6, if the air suction resistance is continuously increased and the air intake is continuously reduced, the controller 5 controls the vibration mechanism to vibrate for 5min according to a certain frequency, the timer 6 and other detection data are cleared after vibration, and the temperature detector 1 starts to detect the actual temperature T1 again.
The orientation and the shape of the air suction inlet of the fan meet the following requirements: the frost can drop to subaerial after being shaken off, avoids the frost to fall into in fan entry wind channel 100. Specifically, the air suction opening may be directed downward.
Claims (7)
1. The defrosting method applied to the outdoor air suction opening of the fan in the severe cold area is characterized by comprising the following steps of:
A. detecting the actual temperature T1 of the pipe wall of the air suction inlet of the fan;
B. when the actual temperature T1 is less than or equal to the preset temperature T, detecting the air suction resistance and the air intake of the air duct of the fan;
C. when the air suction resistance detection value is continuously increased and the air intake detection value is continuously reduced, timing is started, the air suction resistance and the air intake of the air duct of the fan are continuously detected, the continuous detection duration is t, and the change conditions of the air suction resistance and the air intake from the start to the end of the continuous detection are recorded;
D. if the detection value of the air suction resistance, the detection value of the air inlet quantity or the changes of the air suction resistance and the air inlet quantity meet the defrosting requirement, the defrosting mechanism is controlled to execute a defrosting action: when the detection value of the air suction resistance is 10% of the pressure head of the fan, executing a defrosting action; when the detection value of the air inlet quantity is 10% of the air quantity of the fan, a defrosting action is executed; from the beginning to the end of the continuous detection, if the air suction resistance is continuously increased and the air intake is continuously reduced, a defrosting action is executed; repeating the steps A to D after a defrosting action is executed once; and D, if the detection value of the air suction resistance, the detection value of the air intake quantity or the changes of the air suction resistance and the air intake quantity do not meet the defrosting requirement, repeating the steps A to D.
2. The method for defrosting an outdoor suction opening of a fan in a severe cold region according to claim 1, wherein the preset temperature T is 0 ℃.
3. The method for defrosting an outdoor air suction opening of a fan in a severe cold area according to claim 1, wherein in the step C, the duration t of the continuous detection of the air suction resistance and the air intake is 30 min.
4. The defrosting method applied to the outdoor air suction opening of the fan in the severe cold region according to claim 1, wherein the defrosting mechanism is a vibrating mechanism, and the vibrating mechanism vibrates for 5min each time defrosting is performed.
5. The defrosting device for the defrosting method applied to the outdoor air suction inlet of the fan in the severe cold area according to any one of claims 1 to 4 is characterized by comprising a fan inlet air duct (100), a temperature detector (1), an air suction resistance detector (2), an air inlet amount detector (3), a defrosting mechanism (4), a timer (6) and a controller (5), wherein the temperature detector (1), the air suction resistance detector (2) and the air inlet amount detector (3) are all installed in the air suction inlet of the fan inlet air duct (100), and the temperature detector (1), the air suction resistance detector (2), the air inlet amount detector (3), the defrosting mechanism (4) and the timer (6) are all connected with the controller (5).
6. The defrosting device applied to the outdoor air suction opening of the fan in the severe cold area according to claim 5, wherein the defrosting mechanism (4) is a vibrating mechanism, and the vibrating mechanism is installed on the outer wall of the air duct (100) of the fan inlet.
7. The defrosting device applied to the outdoor air suction opening of the fan in the severe cold region according to claim 5, wherein the air suction resistance detector (2) is a pressure sensor, and the air intake detector (3) is a flow sensor.
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| CN201910594288.2A CN110296572B (en) | 2019-07-03 | 2019-07-03 | Defrosting method and defrosting device applied to outdoor air suction opening of fan in severe cold area |
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| CN201910594288.2A CN110296572B (en) | 2019-07-03 | 2019-07-03 | Defrosting method and defrosting device applied to outdoor air suction opening of fan in severe cold area |
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| CN104422064A (en) * | 2013-08-22 | 2015-03-18 | 广东美的制冷设备有限公司 | Air conditioning defrosting control method and device |
| CN106196480A (en) * | 2016-07-28 | 2016-12-07 | 珠海格力电器股份有限公司 | Defrosting control method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005037052A (en) * | 2003-07-15 | 2005-02-10 | Matsushita Electric Ind Co Ltd | Air conditioner |
| CN102519190B (en) * | 2011-12-31 | 2014-06-18 | 青岛海尔空调电子有限公司 | Air cooling unit defrosting control method and system |
| CN105091442B (en) * | 2015-08-31 | 2017-11-07 | 宁波奥克斯电气股份有限公司 | The intelligent defrosting method of multi-connected machine |
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- 2019-07-03 CN CN201910594288.2A patent/CN110296572B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104422064A (en) * | 2013-08-22 | 2015-03-18 | 广东美的制冷设备有限公司 | Air conditioning defrosting control method and device |
| CN106196480A (en) * | 2016-07-28 | 2016-12-07 | 珠海格力电器股份有限公司 | Defrosting control method and device |
| CN106288560A (en) * | 2016-08-15 | 2017-01-04 | 深圳市派沃新能源科技股份有限公司 | A kind of net for air-source heat pump units Defrost method |
| CN107289693A (en) * | 2017-07-11 | 2017-10-24 | 上海理工大学 | A kind of Defrost method |
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