CN102338395A - Automatic air leakage control device of air preheater - Google Patents
Automatic air leakage control device of air preheater Download PDFInfo
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- CN102338395A CN102338395A CN2011102955494A CN201110295549A CN102338395A CN 102338395 A CN102338395 A CN 102338395A CN 2011102955494 A CN2011102955494 A CN 2011102955494A CN 201110295549 A CN201110295549 A CN 201110295549A CN 102338395 A CN102338395 A CN 102338395A
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- air preheater
- air
- rotor
- controller
- measuring circuit
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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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention discloses an automatic air leakage control device of an air preheater. The automatic control device comprises a coil, a measuring circuit, an operational amplifying circuit and a controller, wherein the coil is arranged above a rotor of the air preheater and is connected with an input end of the measuring circuit through a wire, an output end of the measuring circuit is connected with the controller through the operational amplifying circuit, and the controller can control the rise and fall of the rotor of the air preheater. The device can monitor the rise and fall of the rotor of the air preheater in real time so as to control the air leakage amount.
Description
Technical field
The invention belongs to the technical field of electronic measurement and control and automation control, particularly a kind of device of the rotor of control air preheater automatically up-down situation.
Background technology
In the large power plant, air preheater (abbreviation air preheater) is an equipment of collecting and utilize fume afterheat, and its application can directly reduce the temperature of boiler exhaust gas, reduces intrasystem heat-energy losses.Simultaneously, the fin of air preheater can absorb and conduct heat energy, has been equivalent to increase the heating surface of boiler, improves the thermal efficiency of boiler.
Air preheater has the effect of heating fuel required air in boiler, the use of air preheater can improve the burning condition of high temperature air, reduces non-complete combustion of fuel and the thermal loss that causes.The application of air preheater can also improve temperature in the stove, improves radiant heat transfer level and thermal efficiency.
Air preheater in use, the up-down of its rotor can cause the situation of leaking out, leak out can exert an influence to unit; Like unit load, boiler efficiency etc., when inleakage increases, can reduce boiler output; Improve the exhaust gas heat loss boiler heat loss due to incomplete combustion that becomes estranged; Reduce boiler efficiency, increase the power consumption of power plant's pressure fan, air-introduced machine, primary air fan, be necessary very much and be very important thing so the inleakage of control air preheater just seems.
The inventor promptly is based on above consideration, and the automaton that leaks out that this case provides is developed in design.
Summary of the invention
Technical problem to be solved by this invention is to defective and deficiency in the aforementioned background art, and a kind of air-heater leakage automaton is provided, and it can monitor the up-down situation of air preheater rotor in real time, and then the control inleakage.
The present invention is for solving above technical problem, and the technical scheme that is adopted is:
A kind of air-heater leakage automaton; Comprise coil, measuring circuit, operational amplification circuit and controller; Coil is located at the top of air preheater rotor; It is through the input of lead connection measuring circuit, and the output of measuring circuit then connects controller via operational amplification circuit, by controller the up-down of air preheater rotor is controlled.
After adopting such scheme, the present invention utilizes electromagnetic principle, utilizes the corresponding relation of distance between magnetic field that coil produces and coil, the rotor, knows the up-down situation of air preheater rotor, and then reaches the effect of controlling the changing condition that leaks out.
Description of drawings
Fig. 1 is an integrated stand composition of the present invention;
Fig. 2 is the circuit theory diagrams of measuring circuit among the present invention;
Fig. 3 is the sketch map of voltage-current converter circuit among the present invention.
The specific embodiment
Below will combine accompanying drawing, technical scheme of the present invention will be elaborated.
As shown in Figure 1, the present invention provides a kind of air-heater leakage automaton, comprises coil, measuring circuit, operational amplification circuit and controller, introduces respectively below.
Coil is installed on the air preheater rotor top position, and the distance of itself and rotor is advisable can in the working rotor process, producing magnetic field, as in the present embodiment coil being located at the position of the about 12mm in rotor top, and orientates this position as zero position.
The input of measuring circuit is exported first output voltage through the wire connecting line circle according to the magnetic field that coil produces, and its physical circuit can adopt form shown in Figure 2.
The input of operational amplification circuit connects the output of measuring circuit, and first output voltage that measuring circuit is imported carries out processing and amplifying, obtains second output voltage, sends into controller again.
Controller is according to the numerical value change of second output voltage; Convert magnitude of voltage into current value through voltage-current converter circuit (can cooperate shown in Figure 3); Calculate the distance relation between coil and the air preheater rotor again, thereby obtain the up-down situation of air preheater rotor, for instance; Suppose that the change in current amount is shown as 4 ~ 20mA, the up-down amount of air preheater rotor is 0 ~ 16mm; Then when the measurement magnitude of current is 4mA,, be equivalent to zero-bit corresponding to 0mm; When the measurement magnitude of current is 20mA,, arrive highest order corresponding to 16mm; Then can obtain the corresponding proportionate relationship between the two, thereby know the up-down situation of rotor, and in real time to the rotor control of going up and down, and then the control inleakage.
In sum; A kind of air-heater leakage automaton of the present invention; Focus on utilizing the measuring distance between coil and the air preheater rotor to come the variable quantity of corresponding current; Reflect the up-down situation of air preheater rotor with this, and then the inleakage of control air preheater, defective such as the efficient that causes of avoiding leaking out is low, power consumption height.
Above embodiment is merely explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought that proposes according to the present invention, and any change of on the technical scheme basis, being done all falls within the protection domain of the present invention.
Claims (1)
1. air-heater leakage automaton; It is characterized in that: comprise coil, measuring circuit, operational amplification circuit and controller; Coil is located at the top of air preheater rotor; It is through the input of lead connection measuring circuit, and the output of measuring circuit then connects controller via operational amplification circuit, by controller the up-down of air preheater rotor is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102955494A CN102338395A (en) | 2011-09-28 | 2011-09-28 | Automatic air leakage control device of air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102955494A CN102338395A (en) | 2011-09-28 | 2011-09-28 | Automatic air leakage control device of air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102338395A true CN102338395A (en) | 2012-02-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102955494A Pending CN102338395A (en) | 2011-09-28 | 2011-09-28 | Automatic air leakage control device of air preheater |
Country Status (1)
| Country | Link |
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| CN (1) | CN102338395A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110530303A (en) * | 2019-08-28 | 2019-12-03 | 深圳东方锅炉控制有限公司 | The gap control system and its control method of pneumatic regenerative air heater |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4047559A (en) * | 1974-12-06 | 1977-09-13 | Ab Svenska Maskinverken | Regenerative air preheater installation |
| CN2611751Y (en) * | 2003-04-01 | 2004-04-14 | 上海东方机电科技公司 | Return air reheater gap sensor for boiler of power station |
| JP2007315696A (en) * | 2006-05-26 | 2007-12-06 | Toshiba Corp | Diagnosis device and diagnosis method for air preheater |
| CN101126622A (en) * | 2007-09-25 | 2008-02-20 | 深圳东方锅炉控制有限公司 | High temperature non-contact type eddy current displacement sensor |
| CN201680812U (en) * | 2010-05-25 | 2010-12-22 | 上海市东方海事工程技术有限公司 | Adjustable eddy current sensor for air leakage control system of air preheater |
| CN202281243U (en) * | 2011-09-28 | 2012-06-20 | 南京创能电力科技开发有限公司 | Automatic control device for air leakage of air preheater |
-
2011
- 2011-09-28 CN CN2011102955494A patent/CN102338395A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4047559A (en) * | 1974-12-06 | 1977-09-13 | Ab Svenska Maskinverken | Regenerative air preheater installation |
| CN2611751Y (en) * | 2003-04-01 | 2004-04-14 | 上海东方机电科技公司 | Return air reheater gap sensor for boiler of power station |
| JP2007315696A (en) * | 2006-05-26 | 2007-12-06 | Toshiba Corp | Diagnosis device and diagnosis method for air preheater |
| CN101126622A (en) * | 2007-09-25 | 2008-02-20 | 深圳东方锅炉控制有限公司 | High temperature non-contact type eddy current displacement sensor |
| CN201680812U (en) * | 2010-05-25 | 2010-12-22 | 上海市东方海事工程技术有限公司 | Adjustable eddy current sensor for air leakage control system of air preheater |
| CN202281243U (en) * | 2011-09-28 | 2012-06-20 | 南京创能电力科技开发有限公司 | Automatic control device for air leakage of air preheater |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110530303A (en) * | 2019-08-28 | 2019-12-03 | 深圳东方锅炉控制有限公司 | The gap control system and its control method of pneumatic regenerative air heater |
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Application publication date: 20120201 |