CN202281243U - Automatic control device for air leakage of air preheater - Google Patents
Automatic control device for air leakage of air preheater Download PDFInfo
- Publication number
- CN202281243U CN202281243U CN2011203749042U CN201120374904U CN202281243U CN 202281243 U CN202281243 U CN 202281243U CN 2011203749042 U CN2011203749042 U CN 2011203749042U CN 201120374904 U CN201120374904 U CN 201120374904U CN 202281243 U CN202281243 U CN 202281243U
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- CN
- China
- Prior art keywords
- air preheater
- air
- rotor
- controller
- measuring circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
Abstract
The utility model discloses an automatic control device for air leakage of an air preheater. The device comprises a coil, a measuring circuit, an operation 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 by the operation amplifying circuit; and lifting of the rotor of the air preheater is controlled by the controller. The device can monitor lifting condition of the rotor of the air preheater in real time so as to control the air leakage.
Description
Technical field
The utility model 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 design people promptly is based on above consideration, and the automaton that leaks out that this case provides is developed in design.
The utility model content
The utility model technical problem to be solved 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 utility model 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 utility model 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 the integrated stand composition of the utility model;
Fig. 2 is the circuit theory diagrams of measuring circuit in the utility model;
Fig. 3 is the sketch map of voltage-current converter circuit in the utility model.
The specific embodiment
Below will combine accompanying drawing, the technical scheme of the utility model will be elaborated.
As shown in Figure 1, the utility model 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 utility model; 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 the technological thought of explanation the utility model; Can not limit the protection domain of the utility model with this; Every technological thought that proposes according to the utility model, any change of on the technical scheme basis, being done all falls within the utility model protection domain.
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 |
|---|---|---|---|
| CN2011203749042U CN202281243U (en) | 2011-09-28 | 2011-09-28 | Automatic control device for air leakage of air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203749042U CN202281243U (en) | 2011-09-28 | 2011-09-28 | Automatic control device for air leakage of air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202281243U true CN202281243U (en) | 2012-06-20 |
Family
ID=46227410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203749042U Expired - Lifetime CN202281243U (en) | 2011-09-28 | 2011-09-28 | Automatic control device for air leakage of air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202281243U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338395A (en) * | 2011-09-28 | 2012-02-01 | 南京创能电力科技开发有限公司 | Automatic air leakage control device of air preheater |
-
2011
- 2011-09-28 CN CN2011203749042U patent/CN202281243U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338395A (en) * | 2011-09-28 | 2012-02-01 | 南京创能电力科技开发有限公司 | Automatic air leakage control device of air preheater |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120620 |
|
| CX01 | Expiry of patent term |