CN204046468U - A kind of thermal power plant air preheater control circuit - Google Patents
A kind of thermal power plant air preheater control circuit Download PDFInfo
- Publication number
- CN204046468U CN204046468U CN201420473366.6U CN201420473366U CN204046468U CN 204046468 U CN204046468 U CN 204046468U CN 201420473366 U CN201420473366 U CN 201420473366U CN 204046468 U CN204046468 U CN 204046468U
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- Prior art keywords
- frequency converter
- relay
- air preheater
- pressing plate
- power plant
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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 utility model provides a kind of thermal power plant air preheater control circuit, comprises main closing circuit and from closing circuit, described main closing circuit comprises: the main air preheater be cascaded and frequency converter A, and the relay K S15 be connected with frequency converter A; Comprise from closing circuit: be cascaded from air preheater and frequency converter B, and the relay K S15 ' to be connected with frequency converter B, also comprise two protection pressing plate S5 and S5 ', wherein protect the normally-closed contact of pressing plate S5 and relay K S15 ' and Lian Houzai connects with frequency converter A; The normally-closed contact of protection pressing plate S5 ' and relay K S15 Lian Houzai connects with frequency converter B, realize the normally for subsequent use of two control cubicles by increasing maintenance pressing plate in control circuit, the object that when realizing maintenance one, another guarantee normally works.
Description
Technical field
The utility model belongs to control circuit technical field, particularly a kind of air preheater control circuit.
Background technology
Air preheater is exactly that flue gas in boiler back end ductwork will enter the heating surface of the air preheat before boiler to uniform temperature by inner fin, for improving the heat exchange performance of boiler, and reduction energy ezpenditure.Air preheater whether safe and stable operation directly affects the operation whether whole unit can be stable, has very important relation to the safe operation of unit.In order to reach reasonable effect, generally arrange two air preheaters, one is initiatively run (being main air preheater), a slave operation (being from air preheater).For ensureing its safe operation, devise the main control loop controlling the operation of main air preheater and run auxiliary control loop with controlling from air preheater, and in the control loop of two air preheaters operations, all frequency converter is set, devise chain suppression starting-up later time respectively for main and auxiliary control loop simultaneously, the design principle of chain suppression starting-up later time is: the normally-closed contact being connected in series the operation relay of another frequency converter in the closing circuit of two air preheaters respectively, when an air preheater motor runs, another air preheater motor closing circuit disconnects, and plays the effect of suppression.
If wherein main control loop is broken down, close, now, from air preheater work from air preheater control loop.But when wherein an air preheater carries out control system maintenance, due to the factor of chain suppression, be difficult to main and auxiliary control loop completely isolated, so be easy to cause the air preheater control loop power-off run, air preheater motor is caused to trip (as: because of maintenance, cause suppressing interlock circuit wiring to loosen, changing main control loop relay or relay misoperation etc.), light then cause unit load down, RB action (RUNBACK runback, be called for short RB), process and badly even cause that unit is non-to stop.
Utility model content
In order to overcome in existing control loop, a maintenance, the shortcoming that another cannot be normally for subsequent use, the utility model provides a kind of thermal power plant air preheater control circuit, increase maintenance pressing plate in the line and realize the normally for subsequent use of two control cubicles, when realizing maintenance one, another ensures normal work.The utility model solves the technical scheme that its technical problem adopts: a kind of thermal power plant air preheater control circuit, comprise main closing circuit and from closing circuit, described main closing circuit comprises: the main air preheater be cascaded and frequency converter A, and the relay K S15 be connected with described frequency converter A; Describedly to comprise from closing circuit: be cascaded from air preheater and frequency converter B, and the relay K S15 ' to be connected with described frequency converter B, air preheater control circuit described in the utility model also comprises two protection pressing plate S5 and S5 ', and the normally-closed contact of described protection pressing plate S5 and described relay K S15 ' Lian Houzai connect with described frequency converter A; The normally-closed contact of described protection pressing plate S5 ' and described relay K S15 Lian Houzai connect with described frequency converter B.
Here, described protection pressing plate S5 and S5 ' has two states, drops into state and exit status;
Described main closing circuit and describedly also have two states from closing circuit: operating state and inspecting state,
When described main closing circuit is in inspecting state, described protection pressing plate S5 ' is input state; When described be in inspecting state from closing circuit time, described protection pressing plate S5 is input state.Therefore; when main closing circuit and from closing circuit any frequency converter because of electric loop break down turn maintenance time, section drops into protection pressing plate, plays and does not suppress to start the effect of cascading effect by another frequency converter; eliminate the hidden danger suppressing cascading trip, the maintenance of fault frequency converter can be convenient to.
Thermal power plant of the present invention air preheater control circuit, also comprises main control cabinet and auxiliary control cubicle, and described frequency converter A, relay K S15 and protection pressing plate S5 are positioned at described main control cabinet; Described frequency converter B, relay K S15 ' and protection pressing plate S5 ' are positioned at described auxiliary control cubicle.
Main closing circuit in the utility model also comprises closing relay KS14, and described closing relay KS14 connects with the normally-closed contact of described relay K S15 '; Also comprise closing relay KS14 ' from closing circuit, described closing relay KS14 ' connects with the normally-closed contact of described relay K S15.
Preferably, main control cabinet also comprises 24V DC power supply, and described main closing circuit is connected with described 24V DC power supply.
Preferably, auxiliary control cubicle also comprises 24V DC power supply, is describedly connected from closing circuit with described 24V DC power supply.
The utility model greatly improves unit reliability after being optimized arranging air preheater control loop, and after a control cubicle fault, drop into maintenance pressing plate and overhaul, another is reliable for subsequent use, improves economy and the stability of unit.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, a kind of thermal power plant described in the utility model air preheater control circuit is specifically described.
Fig. 1 is air preheater control circuit connection diagram of the present utility model;
Fig. 2 is the circuit connection diagram of the control loop of this practical information;
Fig. 3 is the circuit connection diagram (unprotect pressing plate) of the control loop of prior art;
Fig. 4 is the annexation of frequency converter A and relay K S15;
Fig. 5 is the annexation of frequency converter B and relay K S15.
Embodiment
As illustrated in fig. 1 and 2, a kind of thermal power plant air preheater control and optimize circuit, in main control loop (KS14 closing relay), increases by a protection pressing plate S5 and KS15 ' relay normally-closed contact and connects; From in control loop (KS14 ' closing relay); increase by one protect pressing plate S5 ' with KS15 relay normally-closed contact and connect; when sky, from control loop; any frequency converter because of electric loop break down turn maintenance time; drop into protection pressing plate, play the effect not suppressing to start cascading effect by another frequency converter.Eliminate the hidden danger suppressing cascading trip, the maintenance of fault frequency converter can be convenient to.
Preferably, in the utility model, frequency converter A and frequency converter B are ACS800, and relay K S15 is connected with the X26 pin of frequency converter A; Relay K S15 ' is connected with the X26 pin of frequency converter B.
The above is only preferred embodiment of the present utility model, not any pro forma restriction is done to the utility model, although the utility model discloses as above with preferred embodiment, but and be not used to limit the utility model, any technical staff being familiar with this patent is not departing within the scope of technical solutions of the utility model, make a little change when the technology contents of above-mentioned prompting can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solutions of the utility model, according to any simple modification that technical spirit of the present utility model is done above embodiment, equivalent variations and modification, all still belong in the scope of the utility model scheme.
Claims (9)
1. thermal power plant's air preheater control circuit, comprises main closing circuit and from closing circuit, described main closing circuit comprises: the main air preheater be cascaded and frequency converter A, and the relay K S15 be connected with described frequency converter A; Describedly to comprise from closing circuit: be cascaded from air preheater and frequency converter B, and the relay K S15 ' be connected with described frequency converter B,
It is characterized in that: also comprise two protection pressing plate S5 and S5 ', the normally-closed contact of described protection pressing plate S5 and described relay K S15 ' Lian Houzai connect with described frequency converter A; The normally-closed contact of described protection pressing plate S5 ' and described relay K S15 Lian Houzai connect with described frequency converter B.
2. thermal power plant according to claim 1 air preheater control circuit, is characterized in that, described protection pressing plate S5 and S5 ' comprises operating state, and when described protection pressing plate S5 is operating state, described protection pressing plate S5 is for dropping into; When described protection pressing plate S5 ' is for operating state, described protection pressing plate S5 ' is for dropping into.
3. thermal power plant according to claim 1 and 2 air preheater control circuit, is characterized in that, also comprises main control cabinet and auxiliary control cubicle, and described frequency converter A, relay K S15 and protection pressing plate S5 are positioned at described main control cabinet; Described frequency converter B, relay K S15 ' and protection pressing plate S5 ' are positioned at described auxiliary control cubicle.
4. thermal power plant according to claim 3 air preheater control circuit, is characterized in that, described main closing circuit also comprises closing relay KS14, and described closing relay KS14 connects with the normally-closed contact of described relay K S15 '.
5. thermal power plant according to claim 3 air preheater control circuit, is characterized in that, describedly also comprises closing relay KS14 ' from closing circuit, and described closing relay KS14 ' connects with the normally-closed contact of described relay K S15.
6. thermal power plant according to claim 4 air preheater control circuit, it is characterized in that, described main control cabinet also comprises 24V DC power supply, and described main closing circuit is connected with described 24V DC power supply.
7. thermal power plant according to claim 5 air preheater control circuit, is characterized in that, described auxiliary control cubicle also comprises 24V DC power supply, is describedly connected from closing circuit with described 24V DC power supply.
8. the thermal power plant's air preheater control circuit according to claim 1-2 and any one of 4-7, it is characterized in that, described frequency converter A and described frequency converter B are ACS800, described relay K S15 is connected with the X26 pin of described frequency converter A; Described relay K S15 ' is connected with the X26 pin of described frequency converter B.
9. thermal power plant according to claim 3 air preheater control circuit, is characterized in that, described frequency converter A and described frequency converter B are ACS800, and described relay K S15 is connected with the X26 pin of described frequency converter A; Described relay K S15 ' is connected with the X26 pin of described frequency converter B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420473366.6U CN204046468U (en) | 2014-08-21 | 2014-08-21 | A kind of thermal power plant air preheater control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420473366.6U CN204046468U (en) | 2014-08-21 | 2014-08-21 | A kind of thermal power plant air preheater control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204046468U true CN204046468U (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420473366.6U Active CN204046468U (en) | 2014-08-21 | 2014-08-21 | A kind of thermal power plant air preheater control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525148A (en) * | 2018-11-19 | 2019-03-26 | 宁波华星科技有限公司 | A kind of winding workshop up- coiler frequency conversion drive increases power supply sharing means |
-
2014
- 2014-08-21 CN CN201420473366.6U patent/CN204046468U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525148A (en) * | 2018-11-19 | 2019-03-26 | 宁波华星科技有限公司 | A kind of winding workshop up- coiler frequency conversion drive increases power supply sharing means |
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| GR01 | Patent grant |