CN106837880B - Vortex deicing method - Google Patents
Vortex deicing method Download PDFInfo
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- CN106837880B CN106837880B CN201710119180.9A CN201710119180A CN106837880B CN 106837880 B CN106837880 B CN 106837880B CN 201710119180 A CN201710119180 A CN 201710119180A CN 106837880 B CN106837880 B CN 106837880B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/584—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling or heating the machine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/403—Casings; Connections of working fluid especially adapted for elastic fluid pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Mechanical Engineering (AREA)
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Abstract
The invention provides an eddy current deicing system and an eddy current deicing method, relates to the field of eddy current deicing, and comprises a deicing device and a regulation and control device, wherein the deicing device comprises an eddy current heat gun, a compressed air inlet of the eddy current heat gun is connected with a compressed air source through a compressed air pipe, a hot air outlet of the eddy current heat gun is connected with an air blowing device, and an air blowing port of the air blowing device faces an air inlet of a fan. The eddy current deicing method mainly comprises the following steps: pressure judgment, deicing device regulation and control and work feedback. The vortex deicing system utilizes the vortex heat gun to deice, as the working medium is air, the use cost is low and convenient, and as a key component, the vortex heat gun has no any electrical connection, can continuously provide heat only by compressed air, is simple and convenient to maintain, and the source of the on-site compressed air is easy to obtain. The deicing device can be suitable for various industrial fan systems which are placed in the open air and work under the low-temperature condition and various occasions with severe environments, and is high in deicing efficiency.
Description
Technical Field
The invention provides an eddy current deicing method, and relates to the field of eddy current deicing.
Background
The steam generated by the cooling tower of the power plant can not be diffused, so that the air pressure is greatly increased, and the air temperature is low at night, so that the air temperature is lower due to the high air speed at the inlets of the fan devices, the inlets of the devices are frozen and blocked, the system pressure is rapidly reduced, the operation of a crisis system is caused, and the danger of chain trip exists at any time.
The existing method for deicing comprises the steps of replacing a large grid filter screen, manually deicing, electrically heating a field, melting a blast lamp, leading a pipe from a hot air pipe, using a circulating water heat exchanger and the like, but the prior art has the following problems.
1. The filter screen of the large grid is replaced, so that the influence on blocking sundries is caused, and wet and cold air enters a fan and a pipeline and is easy to freeze in the fan and the pipeline.
2. Manual deicing consumes manpower and can not be timely deiced.
3. Most conductors on the electric heating site threaten personnel and equipment, and the quick heating effect of the wind speed is poor.
4. The blowtorch melts, the explosion is caused by the coal powder contained in the air on site, and the heating effect is poor due to the high wind speed.
5. The pipe is led from the hot air pipeline, the cost is high, and hot air leakage caused by poor sealing easily threatens the personal safety and the equipment operation.
6. The circulating water heat exchanger is high in cost, the pipeline is easy to scale and leak, moisture is larger and can be more easily frozen, and the quick heating effect of the wind speed is poor.
Disclosure of Invention
In order to solve the problems, the invention provides a vortex deicing system which can conveniently and effectively deice a fan, increase the system pressure and improve the automation of the deicing system.
The technical scheme of the invention is as follows: the vortex deicing system comprises a deicing device and a regulation and control device, wherein the deicing device comprises a vortex heat gun, a compressed air inlet of the vortex heat gun is connected with a compressed air source through a compressed air pipe, a hot air outlet of the vortex heat gun is connected with a blowing device, and a blowing port of the blowing device faces an air inlet of a fan.
The technical scheme of the invention also comprises: the regulation and control device comprises a control box, the control box is electrically connected with an electromagnetic valve, and the electromagnetic valve is installed on a compressed air pipe.
The technical scheme of the invention also comprises: the regulating and controlling device comprises a pressure sensor, a pressure monitoring module is installed in the control box, the pressure sensor is electrically connected with the pressure monitoring module, and a pressure measuring point of the pressure sensor is installed on the air inlet pipeline to monitor the system pressure.
The technical scheme of the invention also comprises: the regulating and controlling device comprises a temperature and pressure measuring instrument, a temperature and pressure monitoring module is installed in the control box, the temperature and pressure measuring instrument is electrically connected with the temperature and pressure monitoring module, the temperature and pressure measuring instrument is 10 cm-20 cm away from an air inlet of the fan, and the temperature and pressure measuring instrument and the fan are installed at the same height to monitor temperature and pressure.
The technical scheme of the invention also comprises: install temperature control adjustment gate on the vortex heating power rifle, temperature control adjustment gate is connected with the control box electricity, can adjust the hot-blast temperature of vortex heating power rifle convenient and fast ground.
The technical scheme of the invention also comprises: the compressed air pipe is provided with an on-site compressed air interface or is directly communicated with the air compression device, if the construction site has a compressed air source, the compressed air pipe can be butted with the air compression device through the on-site compressed air interface, and if the construction site does not have the compressed air source, the compressed air pipe can compress air through a standby air compression device.
The technical scheme of the invention also comprises the following steps: the air inlet of the fan is arranged on the side face of the tail portion, the air blowing device is of an annular structure, the annular structure is sleeved at the tail end of the tail portion of the fan, the air blowing port is arranged on the inner side of the annular structure, the air blowing port faces the air inlet of the fan, heat energy loss can be reduced, and equipment space is saved.
The calculation is described below by taking a blower of type 9-26-6.3A as an example.
The diameter of the filter screen: d =0.435m screen length: l =0.5m
Frost ice density ρ =880kg/m 3
Thickness of ice formation: δ =0.001m
Melting enthalpy of ice h =335KJ/kg
Heat transfer efficiency: eta =50% -70%
v＝ΠDLδ＝3.14*0.435*0.5*0.001＝6.83*10 -4 m -3
m＝ρV＝880*6.83*10 -4 m -3 ＝0.6kg
Q＝m*h＝0.6*335＝201J
Q 1 ＝Q/η＝201/0.5＝402J
Heat of vortex heat gun: 1cfm is approximately equal to 1.7m 3 /h
The flow rate of the common vortex thermal power gun is as follows: q. q.s v ＝2～8cfm＝3.4～13.6m 3 /h
Temperature T =70 ℃ density: p is a radical of formula k ＝1.029kg/m 3 (commonly-used air density meter)
Air enthalpy value calculation: h = (1.01+1.84d) t +2500d (kj/kg dry air)
In the formula: t-air temperature C
d-moisture content of air kg/kg Dry air
1.01-average constant pressure specific heat of dry air kj/(kg.K)
1.84-average constant pressure specific heat kj/(kg.K) of steam
Latent heat of vaporization kj/kg of water at 2500-0 DEG C
The air pressure d =20% -40% from the swirler
h＝(1.01+1.84*20％)*70+2500*20％＝596.46ki/kg
q 1 ＝h*p k *q v ＝596.46*1.029*3.4＝2086.8kj/h
t＝Q 1 /q 1 ＝0.2h
Even if the device is used for 0.2h =12min, the ice can be removed.
The invention also provides a vortex deicing method, which mainly comprises the following steps: pressure judgment, regulation and control of the deicing device and work feedback; the pressure judging step is mainly that after entering winter, the system pressure P measured by the pressure sensor is obtained 1 Less than a predetermined minimum pressure value P 0 When P is greater than P, the step of regulating and controlling the deicing device is carried out 1 Greater than or equal to P 0 Then the pressure sensor continues to measure the system pressure until P 1 Less than P 0 And then entering the regulating and controlling step of the deicing device.
The deicing device regulation and control steps mainly comprise:
when the temperature t measured by the temperature and pressure measuring instrument 1 Not more than the set freezing temperature t 0 And Pb 1 Not less than the set icing pressure Pb 0 At the same time, the solenoid valve is opened, based on the measured t 1 And Pb 1 Adjusting a temperature control adjusting door to enable the temperature of hot air of the vortex thermal power gun to remove ice coated on the fan, and entering a working feedback step;
when the temperature and pressure measured by the temperature and pressure measuring instrument does not satisfy t 1 ＜＝t 0 And Pb 1 ＞＝Pb 0 Then the temperature and pressure are detected again until the measured temperature t 2 ＜＝t 0 And Pb 2 ＞＝Pb 0 When in use, the electromagnetic valve is opened, the temperature control adjusting door is adjusted to ensure that the hot air temperature of the vortex thermal power gun removes the ice coated on the fan,and entering a working feedback step.
The working feedback step mainly comprises: when the regulation and control step of the deicing device is finished, the working feedback step is carried out, and at the moment, the pressure sensor measures the system pressure P again 2 ；
When P is present 2 Greater than or equal to P 0 When the electromagnetic valve is closed, the regulation is finished, and when P is up 2 Less than P 0 Then, the control step of the deicing device is carried out again until P measured by the pressure sensor 2 Greater than or equal to P 0 And closing the electromagnetic valve to finish the regulation.
The beneficial effects of the invention are as follows: the vortex deicing system utilizes the vortex heat gun to deice, the working medium is air, the use cost is low and convenient, the highest temperature capable of being provided can reach +180 ℃ on the premise of 7Bar and 25 ℃ air, the vortex heat gun is used as a key part, the vortex heat gun does not have any electrical connection, heat can be continuously provided only by compressing air, the installation and the disassembly are convenient, and the maintenance is simple and convenient.
For power plants and other industrial and mining enterprises, the source of the on-site compressed air is easy to obtain. The vortex deicing system has no moving part, can work for a long time without maintenance, and does not cause mechanical vibration and electromagnetic interference. The fan can be suitable for various industrial fan systems which are placed in the open air and work under the low-temperature condition. The deicing device can also be suitable for occasions with severe environments, such as low temperature, high pressure, high pollution, high dust concentration, high noise, high dangerous gas and the like, has high deicing efficiency, and has good practicability and market popularization value.
Drawings
FIG. 1 is a schematic view of the vortex deicing system of the present invention;
FIG. 2 is a schematic view of a pressure determination process according to the present invention;
FIG. 3 is a flow chart of the deicing device control according to the present invention;
FIG. 4 is a schematic diagram of the operational feedback of the present invention;
fig. 5 is a schematic view of an installation position of the blowing device.
The device comprises a field compressed air interface 1, a main valve 2, a solenoid valve 3, a compressed air pipe 4, a vortex heat gun 5, a blowing device 6, a fan 7, a fan 8, a pressure sensor 9, a temperature and pressure measuring instrument 10 and a control box.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples.
Meanwhile, since only some embodiments are described below, the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The vortex deicing system comprises a deicing device and a regulation and control device, wherein the deicing device comprises a vortex heat gun 5, a compressed air inlet of the vortex heat gun 5 is connected with a compressed air source through a compressed air pipe 4, a hot air outlet of the vortex heat gun 5 is connected with a blowing device 6, and a blowing port of the blowing device 6 faces an air inlet of a fan 7.
The regulation and control device comprises a control box 10, the control box 10 is electrically connected with an electromagnetic valve 3, and the electromagnetic valve 3 is installed on a compressed air pipe 4.
The regulation and control device comprises a pressure sensor 8, a pressure monitoring module is installed in the control box 10, the pressure sensor 8 is electrically connected with the pressure monitoring module, and a pressure measuring point of the pressure sensor 8 is installed on the air inlet pipeline to monitor the system pressure.
The regulation and control device comprises a temperature and pressure measuring instrument 9, a temperature and pressure monitoring module is installed in the control box 10, the temperature and pressure measuring instrument 9 is electrically connected with the temperature and pressure monitoring module, the distance between the temperature and pressure measuring instrument 9 and an air inlet of the fan 7 is 10 cm-20 cm, and the temperature and pressure measuring instrument 9 and the fan 7 are installed at the same height to monitor temperature and pressure.
Install temperature control adjustment gate on the vortex heating power rifle 5, temperature control adjustment gate is connected with control box 7 electricity, can adjust vortex heating power rifle 5's hot-blast temperature convenient and fast ground.
The compressed air pipe 4 is provided with an on-site compressed air interface 1 or is directly communicated with an air compression device, if a construction site has a compressed air source, the compressed air can be butted with the on-site compressed air interface 1, and if the construction site does not have the compressed air source, the air can be compressed by a standby air compression device.
The air inlet of the fan 7 is arranged on the side face of the tail portion, the air blowing device 6 is of an annular structure, the annular structure is sleeved at the tail end of the tail portion of the fan 7, an air blowing port is arranged on the inner side of the annular structure, and the air blowing port faces the air inlet of the fan 7, so that heat energy loss can be reduced, and equipment space is saved.
And a main valve 2 is installed on the compressed air pipe 4. When the air conditioner is not used in summer, the main valve 2 is closed, and when the air conditioner enters winter (the air temperature is lower than 5 ℃), the main valve 2 is opened.
As shown in fig. 2 to 4, the regulation and control of the system mainly comprises three steps of pressure judgment, deicing device regulation and control and work feedback, wherein the pressure judgment step mainly comprises the step of measuring the system pressure P by the pressure sensor 8 1 Less than a predetermined minimum pressure value P 0 When P is greater than P, the deicing device is regulated and controlled 1 Greater than or equal to P 0 At this time, the pressure sensor 8 continues to measure the system pressure until P 1 Less than P 0 And then entering the step of regulating and controlling the deicing device. Wherein P is 0 For the minimum pressure allowed by the system, the system trip is automatically performed after the pressure is lower than the minimum pressure, and a 1000MW boiler dilution fan is taken as an example P 0 ＝5kpa。
The deicing device comprises the following main steps: and judging whether the inlet is frozen according to the temperature and the pressure of the external environment at the inlet measured by the temperature and pressure sensor 8, wherein the freezing temperature and the freezing pressure are shown in a table I.
Table one: freezing temperature and pressure gauge
| Ambient temperature t (. Degree. C.) | Pressure of the surroundings Pb (kPa) |
| -20 | -- |
| -15 | 0.191 |
| -10 | 0.286 |
| -5 | 0.421 |
| 0.00989 | 0.610 |
| +20 | 2.338 |
| +100 | 101.3 |
| 374 | 2.204x104 |
When the temperature t measured by the temperature and pressure measuring instrument 9 1 Not more than a set freezing temperature t 0 And Pb 1 Not less than the set icing pressure Pb 0 At this time, the solenoid valve 3 is opened, based on the measured t 1 And Pb 1 Regulating temperature controls regulating gateThe icing on the fan 7 is removed by the hot air temperature of the vortex thermal gun 5, and the work feedback step is carried out; when the temperature and pressure measured by the temperature and pressure measuring instrument 9 does not satisfy t 1 ＜＝t 0 And Pb 1 ＞＝Pb 0 Then the temperature and pressure are detected again until the measured temperature t 2 ＜＝t 0 And Pb 2 ＞＝Pb 0 When the vortex thermal power gun is started, the electromagnetic valve 3 is opened, the temperature control adjusting door is adjusted to enable the hot air temperature t' of the vortex thermal power gun to be removed, and the working feedback step is carried out.
t' and t 0 The corresponding table of (2) is shown in table two.
Table two: t and t' correspondence table
The working feedback step mainly comprises: when the regulation and control step of the deicing device is finished, the working feedback step is carried out, and at the moment, the pressure sensor 8 measures the system pressure P again 2 (ii) a When P is 2 Greater than or equal to P 0 When the electromagnetic valve 3 is closed, the regulation is finished, and when P is reached 2 Less than P 0 Then, the control step of the deicing device is carried out again until P is detected by the pressure sensor 8 2 Greater than or equal to P 0 And then the electromagnetic valve 3 is closed to finish the regulation.
Wherein, the time can be reasonably set by the electromagnetic valve 3 for timing purging, and the time interval can be set according to the weather condition about the time setting.
The above description is only exemplary of the present invention and should not be taken as limiting the invention in any way, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A method of vortex deicing, characterized by:
the vortex deicing system is used and comprises a deicing device and a regulating device, wherein the deicing device comprises a vortex heat gun, a compressed air inlet of the vortex heat gun is connected with a compressed air source through a compressed air pipe, a hot air outlet of the vortex heat gun is connected with an air blowing device, and an air blowing port of the air blowing device faces an air inlet of a fan; the regulating device comprises a control box, the control box is electrically connected with an electromagnetic valve, and the electromagnetic valve is arranged on a compressed air pipe; the vortex thermal power gun is provided with a temperature control adjusting door which is electrically connected with the control box; the regulating device comprises a pressure sensor, a pressure monitoring module is installed in the control box, the pressure sensor is electrically connected with the pressure monitoring module, and a pressure measuring point of the pressure sensor is installed on the air inlet pipeline; the regulating device comprises a temperature and pressure measuring instrument, a temperature and pressure monitoring module is installed in the control box, the temperature and pressure measuring instrument is electrically connected with the temperature and pressure monitoring module, the temperature and pressure measuring instrument is 10 cm-20 cm away from an air inlet of the fan, and the temperature and pressure measuring instrument and the fan are installed at the same height;
the vortex deicing method mainly comprises the following steps: pressure judgment, regulation and control of the deicing device and work feedback; the method comprises a pressure judging step and a deicing device regulating step, wherein the pressure judging step mainly comprises the steps of performing the deicing device regulating step after entering winter when the system pressure P1 measured by a pressure sensor is smaller than a preset minimum pressure value P0, continuously measuring the system pressure by the pressure sensor when the P1 is larger than or equal to the P0 until the system pressure enters the deicing device regulating step after the P1 is smaller than the P0, opening an electromagnetic valve when the temperature t1 measured by a temperature and pressure measuring instrument is smaller than or equal to a set icing temperature t0 and the Pb1 is larger than or equal to a set icing pressure Pb0, regulating a temperature control regulating valve according to the measured t1 and Pb1 to enable the hot air temperature of the thermal vortex gun to remove ice coated on a fan, and entering a working feedback step.
2. A method of vortex deicing as set forth in claim 1 wherein: and the compressed air pipe is provided with an on-site compressed air interface or is directly communicated with an air compression device.
3. A method of vortex deicing as claimed in claim 1 wherein: the air blowing device is characterized in that an air inlet of the fan is formed in the side face of the tail portion, the air blowing device is of an annular structure, the annular structure is sleeved at the tail end of the tail portion of the fan, an air blowing port is formed in the inner side of the annular structure, and the air blowing port faces the air inlet of the fan.
4. A method of vortex deicing as set forth in claim 1 wherein: the deicing device regulation and control steps mainly comprise:
when the temperature and pressure measured by the temperature and pressure measuring instrument does not satisfy t1 < = t0 and Pb1 > = Pb0, the temperature and pressure are detected again until the measured temperature t2 < = t0 and Pb2 > = Pb0, the electromagnetic valve is opened, the temperature control adjusting door is adjusted to enable the hot air temperature of the vortex heat gun to remove the ice coating on the fan, and the operation feedback step is carried out.
5. A method of vortex deicing as claimed in claim 1 or 4, wherein: the working feedback step mainly comprises the following steps: when the deicing device regulation step is finished, the working feedback step is carried out, and the pressure sensor measures the system pressure P2 again at the moment; and when the P2 is more than or equal to the P0, closing the electromagnetic valve to finish the regulation, and when the P2 is less than the P0, restarting the regulation step of the deicing device until the P2 measured by the pressure sensor is more than or equal to the P0, closing the electromagnetic valve to finish the regulation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102235361A (en) * | 2010-04-20 | 2011-11-09 | 上海工程技术大学 | Method and device for constant pressure control of screw air compressor |
| CN201826276U (en) * | 2010-04-23 | 2011-05-11 | 阳碁动力节能科技股份有限公司 | Spraying, deicing and snow-removing device |
| CN101916108B (en) * | 2010-08-31 | 2012-07-04 | 上海交通大学 | Automation device for use in civil aircraft environment control system function test |
| CN203890939U (en) * | 2014-04-23 | 2014-10-22 | 南京铁道职业技术学院 | Automotive non-contact type snow sweeping deicing device for road |
| CN203890938U (en) * | 2014-04-23 | 2014-10-22 | 南京铁道职业技术学院 | Ice road deicing cleaning machine |
| CN203890941U (en) * | 2014-04-23 | 2014-10-22 | 南京铁道职业技术学院 | Non-contact snow sweeping and ice removing device of railway track |
| US20150345390A1 (en) * | 2014-05-29 | 2015-12-03 | General Electric Company | Systems and methods for de-icing inlet screens and dehumidifying inlet air filters for gas turbine engines |
| CN204285918U (en) * | 2014-12-09 | 2015-04-22 | 苟仲武 | A kind of evaporimeter potentiating and anti-caking frost device |
| CN206626021U (en) * | 2017-03-01 | 2017-11-10 | 许超 | One kind vortex deicing system |
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