CN2655207Y - Temp monitoring alarm for air preheater - Google Patents
Temp monitoring alarm for air preheater Download PDFInfo
- Publication number
- CN2655207Y CN2655207Y CN 200320108237 CN200320108237U CN2655207Y CN 2655207 Y CN2655207 Y CN 2655207Y CN 200320108237 CN200320108237 CN 200320108237 CN 200320108237 U CN200320108237 U CN 200320108237U CN 2655207 Y CN2655207 Y CN 2655207Y
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- China
- Prior art keywords
- rotor
- air preheater
- temperature monitoring
- sensor
- alarming
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Abstract
The utility model relates to a real-time and accurate online temperature monitoring device used for air preheater, in particular to a thermocouple temperature monitoring device with thermal efficiency value as a basis for temperature monitoring and integrated with a rotor speed testing and shutdown alarming system. The utility model comprises two special thermocouple positioned respectively on two sides of the air preheater, a signal pretreatment module, a programmable controller and a touch screen. The rotor speed testing and shutdown alarming device is arranged near the rotor of the air preheater and the rotor speed testing and shutdown alarming device comprises a transmission device, a sensor and a measurement display; the transmission device is arranged on the rotor, the sensor is positioned near the transmission device and connected with the measurement display. Due to the structure adopted, the technical problems such as troubles induced by local temperature rise resulting from over speed of the rotor of air preheater are solved, alarming accuracy is greatly improved and wrong alarming is greatly reduced.
Description
Technical field:
The utility model relate to air preheater carry out in real time, on-line temperature monitoring accurately, particularly a kind of foundation of introducing thermal efficiency value as temperature monitoring is in conjunction with the test the speed electric thermo-couple temperature monitoring device of stop alarming system of rotor.
Background technology:
Historical experience proves that most of air preheaters catch fire, and at first is to take place at primary heater heat transfer element regional area, is to be caused by the imperfect combustion fuel fire that is deposited on the inner heated element of primary heater, particularly oil fuel remnants.If this moment, " focus " of burning can not in time be found, can make local heated element temperature rise to 700～760 ℃, cause the heated element oxidation, metal heated component temperature can rise to 1650 ℃ or higher in the oxidizing process in a few minutes, metal heated element self is blazed up, finally cause primary heater to catch fire, cause irremediable loss.
Wherein, the rotor of primary heater can usually cause local temperature to rise owing to rotating speed is too fast, be the one of the main reasons that causes bad result.
The utility model content
The rotor that the utility model will solve primary heater can usually cause the local temperature rising to cause bad result's technical matters owing to rotating speed is too fast, a kind of novel air preheater temperature monitoring warning device is provided.
A kind of air preheater temperature monitoring warning device, comprise the special electric thermo-couple, signal pre-processing module, programmable controller and the touch-screen that place primary heater two sides respectively, it is characterized in that: be provided with the rotor stppage alarm device that tests the speed near the rotor of this primary heater, this stppage alarm device that tests the speed is made of signal transmitter, sensor and measurement display instrument, signal transmitter is positioned on the rotor, and sensor is positioned at the signal transmitter periphery and is connected to the measurement display instrument.
This sensor adopts protected type near switch.
Near the sensor that three tunnel independence speed measuring functions are arranged the primary heater rotor shaft.
Basic mechanical design feature index of the present invention is compared with the existing technical indicator of home and abroad like product, sees the following form:
| Name of product | The place of production | Groundwork principle, gordian technique | Performance relatively |
| Infrared hot spot detection system | The U.S. | Far infrared thermometry, measurement air out place rotor outer surface temperature, Mechanical Driven form: the driving trolley of belt track | Equipment is huge, and infrared probe rapid wear, Mechanical Driven be often stuck, be easy to generate false alarm. |
| The thermopair fire alarm system | Britain | Thermocouple temperature measurement technology, measurement air out place temperature | Be easy to generate false alarm, dynamic response is slower |
| The infrared hot spot detection system of scan-type | China | Far infrared thermometry, measurement air out place rotor outer surface temperature, Mechanical Driven form: wave the scanning form | Equipment is huge, the infrared probe consumable accessory, is easy to generate false alarm |
| This device | China | The data acquisition of employing multi-point temp, the comparison of thermal effect value, PLC control, rotor tests the speed stppage alarm, touch-screen etc. | Dependable performance improves the accuracy rate of reporting to the police greatly, reduces " false alarm " |
From last table as can be known, the home and abroad has been developed dissimilar safety monitoring assemblies, adopt infrared focus detection or thermopair to survey the temperature that two kinds of forms are monitored heated element surface and near zone mostly, because their thermal response time is fast, and all very sensitive to the slight change of temperature.Alarm parameters can be set, and when recording temperature and exceed setting value, it just triggers alarm equipment alarm,
Although the electric thermo-couple temperature monitoring equipment is than infrared observation equipment, existing very big change on the structure, but their detection base reason all is the temperature of only monitoring air preheater air in place or exit, ignored the influence of the temperature fluctuation of other import everywhere of primary heater to whole air preheater temperature rise, be easy to generate " false alarm ", the reliability that temperature monitoring is reported to the police also can reduce.
Make a general survey of the overview as the above-mentioned dissimilar safety monitoring device of researching and developing in recent years both at home and abroad, each have their own characteristics from varying degrees, have been alleviated the infringement of fire to air preheater.
These equipment are in security, reliability and all also have some problems on serviceable life, and are easy to generate false alarm but generally.
This device is after combining the relative merits of domestic and international equipment, the technology that adopts is more advanced, more reliable, it has improved the temperature that in the past generally only detects the air out place of air preheater, ignored the influence of the fluctuation of air in place temperature to whole air preheater, and combine the air in place, the temperature variation relation at air out place and gas approach place, introduce primary heater thermal efficiency value and make the monitoring foundation, go back the monitoring of primary heater heated element rotating speed simultaneously as an important control factor, rotating speed to heated element is monitored in real time, and both are in conjunction with the accuracy rate and the minimizing " false alarm " that can improve warning greatly.
Description of drawings:
Fig. 1 is the structure principle chart of air preheater temperature monitoring warning device.
Fig. 2 is the rotor stppage alarm apparatus structure schematic diagram that tests the speed.
Embodiment:
See also Fig. 1, the formation of the utility model air preheater temperature monitoring warning device is mainly by a series of highly sensitive special electric thermo-couples 5, place primary heater 6 two sides, signal pre-processing module 4, rotor to test the speed respectively monitoring equipment that stppage alarm device 3, programmable controller 2 and touch-screen 1 form.
A series of special electric thermo-couple probes 6 that are arranged in primary heater 6 air side and fume side among Fig. 1 when the primary heater rotor turns round, begin the primary heater heated element is carried out temperature monitoring; Simultaneously the rotor stop alarming system 3 that tests the speed also begins the speed of rotor is measured; The millivolt signal that produces by 4 pairs of a series of special electric thermo-couple probes of signal pre-processing module carries out pre-service, is converted to temperature signal, flows to programmable controller 2 and handles; Programmable controller 2 is handled the temperature signal and the rotor speed signal at air in place, gas approach place and the air out place of input, calculate, analyze, compare, at last the result is sent into touch-screen display 1, send no source contact to central station of floating docks such as high temperature, fault simultaneously and use.Touch-screen 1 is mainly used to monitor the medial temperature and the rotor speed measurement near the temperature value of the inner measuring point of air preheater, air preheater thermal efficiency value, whole air preheater air out place, can also carry out necessary setting and carry out necessary modification or the like temperature comparison base value and safe speed of rotation.
This device increases the rotor stppage alarm device (see figure 2) that tests the speed newly, and this device is monitored the situation of change of primary heater internal temperature from another angle.Because when metal heated element overtemperature arrives to a certain degree, metal framework structure meeting expanded by heating, cause malformation and heavy wear primary heater inner radial diaphragm seal and axial seal sheet, the heated element rotating speed descends the first mate or random jump thereupon, until the rotor stall, this all may be the key character that primary heater catches fire.Therefore when the rotating speed of rotor was irregular fluctuation or is lower than safety value (can set), device promptly sent alerting signal and the rotor stppage alarm device that tests the speed is installed is provided a kind of more advanced, more reliable, more effective monitoring means for whole temperature monitoring system.
The rotor stppage alarm device that tests the speed is to adopt the tachometric survey display instrument of onechipmicroprocessor as master chip, is installed near the (see figure 2) primary heater rotor shaft.It has three tunnel independence speed measuring functions, can measure the three paths of independent tach signal respectively to same rotating speed.Any one the tunnel if there is fault in three the tunnel, also can not influence other measurement of two tunnel.This device is mainly formed (see figure 2) by three parts, i.e. signal transmitter 31, sensor 32 and measurement display instrument 33.Signal transmitter 31 is made inductor, weekly 60 pulse signals of sender; Sensor 32 adopts protected type near switch, when sensor 32 receives signal, bright near the switch pilot lamp on the one hand, again level signal is delivered to simultaneously and measured on the display instrument 33, measure display instrument 33 and directly show current rotating speed, and export three groups of 4-20mA normalized current signals simultaneously, and be connected in the temperature monitoring warning device field control cabinet.After three groups of level signals are calculated, handled by programmable controller, pass the signal to touch-screen again and show.Provide 4-20mA output current to the user in addition, show rotating speed for central station of floating dock.
Claims (3)
1, a kind of air preheater temperature monitoring warning device, comprise the special electric thermo-couple, signal pre-processing module, programmable controller and the touch-screen that place primary heater two sides respectively, it is characterized in that: be provided with the rotor stppage alarm device (3) that tests the speed near the rotor of this primary heater, this stppage alarm device (3) that tests the speed is by signal transmitter (31), sensor (32) and measure display instrument (33) formation, signal transmitter (31) is positioned on the rotor, and sensor (32) is positioned at signal transmitter (31) periphery and is connected to measures display instrument (33).
2, air preheater temperature monitoring warning device according to claim 1 is characterized in that: this sensor (32) adopts protected type near switch.
3, air preheater temperature monitoring warning device according to claim 1 is characterized in that: near the sensor (32) that three tunnel independence speed measuring functions are arranged primary heater (3) rotor shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320108237 CN2655207Y (en) | 2003-11-21 | 2003-11-21 | Temp monitoring alarm for air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320108237 CN2655207Y (en) | 2003-11-21 | 2003-11-21 | Temp monitoring alarm for air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2655207Y true CN2655207Y (en) | 2004-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320108237 Expired - Fee Related CN2655207Y (en) | 2003-11-21 | 2003-11-21 | Temp monitoring alarm for air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2655207Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102152771A (en) * | 2011-03-03 | 2011-08-17 | 南京交通职业技术学院 | Automatic escape device of bus in fire disaster |
| CN102243109A (en) * | 2011-06-28 | 2011-11-16 | 高明逊 | Metal wall temperature measurement system for rotary air preheater |
| CN102393262A (en) * | 2011-09-22 | 2012-03-28 | 上海市东方海事工程技术有限公司 | Air preheater optical fiber temperature on-line monitoring system and method |
| CN103116033A (en) * | 2013-01-29 | 2013-05-22 | 哈尔滨博汇达自动化控制技术开发有限公司 | Rotational speed detection and stoppage alarm device of air preheater |
| CN103292924A (en) * | 2012-02-27 | 2013-09-11 | 福建省长汀金龙稀土有限公司 | Temperature measuring equipment and temperature measuring thermocouple for rare earth electrolytic cell |
| CN109443560A (en) * | 2018-10-31 | 2019-03-08 | 洛阳森德石化工程有限公司 | A kind of application method of air preheater temperature detection remote alarming system |
| CN112034782A (en) * | 2020-09-17 | 2020-12-04 | 江阴信和电力仪表有限公司 | Air preheater online state monitoring and fault prediction method |
-
2003
- 2003-11-21 CN CN 200320108237 patent/CN2655207Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102152771A (en) * | 2011-03-03 | 2011-08-17 | 南京交通职业技术学院 | Automatic escape device of bus in fire disaster |
| CN102243109A (en) * | 2011-06-28 | 2011-11-16 | 高明逊 | Metal wall temperature measurement system for rotary air preheater |
| CN102243109B (en) * | 2011-06-28 | 2013-03-13 | 高明逊 | Metal wall temperature measurement system for rotary air preheater |
| CN102393262A (en) * | 2011-09-22 | 2012-03-28 | 上海市东方海事工程技术有限公司 | Air preheater optical fiber temperature on-line monitoring system and method |
| CN103292924A (en) * | 2012-02-27 | 2013-09-11 | 福建省长汀金龙稀土有限公司 | Temperature measuring equipment and temperature measuring thermocouple for rare earth electrolytic cell |
| CN103116033A (en) * | 2013-01-29 | 2013-05-22 | 哈尔滨博汇达自动化控制技术开发有限公司 | Rotational speed detection and stoppage alarm device of air preheater |
| CN109443560A (en) * | 2018-10-31 | 2019-03-08 | 洛阳森德石化工程有限公司 | A kind of application method of air preheater temperature detection remote alarming system |
| CN112034782A (en) * | 2020-09-17 | 2020-12-04 | 江阴信和电力仪表有限公司 | Air preheater online state monitoring and fault prediction method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20041110 Termination date: 20121121 |