CN203296834U - Device for solving problem that vacuum degree in condenser is low in starting process of combined cycle unit - Google Patents
Device for solving problem that vacuum degree in condenser is low in starting process of combined cycle unit Download PDFInfo
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- CN203296834U CN203296834U CN2013203064063U CN201320306406U CN203296834U CN 203296834 U CN203296834 U CN 203296834U CN 2013203064063 U CN2013203064063 U CN 2013203064063U CN 201320306406 U CN201320306406 U CN 201320306406U CN 203296834 U CN203296834 U CN 203296834U
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- reheater
- door operation
- power door
- main steam
- condenser
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Abstract
The utility model relates to a device for solving the problem that the vacuum degree in a condenser is low in the starting process of a combined cycle unit. The device comprises a main steam pipeline and is characterized in that a first reheater, a second reheater, the condenser and a turbine valve are arranged on the main steam pipeline, the fist reheater and the second reheater are sequentially connected to the inlet end of the main steam pipeline in series, the inlet end of the condenser is connected with the outlet end of the main steam pipeline, and the outlet end of the condenser is connected to a turbine through the turbine valve. Two bypasses are arranged on the main steam pipeline, one of the bypasses is connected to a waste heat boiler through a first atmospheric exhaust electrically-operated door and a second atmospheric exhaust electrically-operated door, and the other one of the bypasses is connected to the turbine through a bypass switch and a drainage electrically-operated door. The main steam pipeline is provided with a pressure sensor, the output end of the pressure sensor is connected with the input end of a distributed control system, the output end of the DCS is connected with the input end of the first atmospheric exhaust electrically-operated door, the input end of the second atmospheric exhaust electrically-operated door and the input end of the drainage electrically-operated door.
Description
Technical field:
The utility model relates to a kind of low device of condenser vacuum in the Combined Cycle Unit start-up course that solves, and is applicable to the M701F Combined Cycle Unit in start-up course.Belong to power generation industries and accessory technical field.
Background technique:
In technical field of power generation, the phenomenon that condenser vacuum is low, in start-up course, occurs, the safe operation of grave danger unit in generating Combined Cycle Unit often.Research is found, causing the main cause that the unit vacuum is low is to have sneaked into air in main steam line, and go wrong be mainly due to: (1) is in the unit starting process, in steam turbine side pipe road draining valve and steam turbine, the low voltage bypass door opens, a large amount of air pour in vapour condenser, and the degree of vacuum of vapour condenser is reduced greatly.(2) in start-up course, during less than 0.05MPa, reheater leaves automatically to empty steam discharge power door operation, after unlatching, causes air to blow back into reheater, affects the condenser vacuum of unit when combustion machine igniting and reheated steam pressure.
For example: the supporting Hangzhoupro pot NG-M701F-R exhaust heat boiler of the M701F Combined Cycle Unit that the claimant is applying is in start-up course, and during less than 0.05MPa, reheater leaves automatically to empty steam discharge power door operation when the igniting of combustion machine and reheated steam pressure; After when reheated steam pressure reached 0.1MPa or exhaust heat boiler cold start, reheater left 1 minute to empty steam discharge power door operation, reheater cut out automatically to empty steam discharge power door operation.This control design of reheater to empty steam discharge power door operation, its result does not only have the steam discharge effect, after unlatching, causes on the contrary air to blow back into reheater, affects the condenser vacuum of unit.Therefore, for overcoming said method, cause the too low shortcoming and defect of condenser vacuum, and the requirement of considering power plant's actual production, be necessary to propose a kind of M701F of solution Combined Cycle Unit and open method and the device that in the machine process, condenser vacuum is low.
The model utility content:
The purpose of this utility model is for a kind of low device of condenser vacuum in the Combined Cycle Unit start-up course that solves is provided.That this device has is simple in structure, automaticity is higher, improve the characteristics of safe operation of electric network.
The purpose of this utility model can reach by taking following technological scheme:
Solve the low device of condenser vacuum in the Combined Cycle Unit start-up course, comprise main steam line, its structural feature is: on main steam line, be provided with the first reheater, the second reheater, vapour condenser and steam turbine porthole, the first reheater, the second reheater are serially connected in the entry end of main steam line successively, the entry end of vapour condenser connects the outlet end of main steam line, and the outlet end of vapour condenser is connected on steam turbine by the steam turbine porthole; Main steam line is provided with two bypasses, and one of bypass is connected on exhaust heat boiler by first pair of empty exhaust power door operation, second pair of empty exhaust power door operation successively, and two of bypass is connected on steam turbine by by-pass switch and hydrophobic power door operation; At main steam line, be provided with pressure transducer, the signal output part of pressure transducer connects the signal input part of Distributed Control System DCS, and the signal output part of Distributed Control System DCS is connected to the control input end of first pair of empty exhaust power door operation, second pair of empty exhaust power door operation and hydrophobic power door operation; By pressure transducer, detect vapor pressure the discharge pressure signal of main steam line and to Distributed Control System DCS, Distributed Control System DCS, control accordingly the working state of first pair of empty exhaust power door operation, second pair of empty exhaust power door operation and hydrophobic power door operation.
By Distributed Control System DCS, first pair of empty exhaust power door operation and second pair of empty exhaust power door operation are controlled, what prevented from opening machine process Air blows back into main steam line again, and before unit starting, taken the air in main steam line away, prevent that from there is air in main steam line, to solve vapour condenser when the unit starting, the problem that vacuum is low appears.
The purpose of this utility model can also reach by taking following technological scheme:
Further, the input end of described the first reheater is connected with cold reheated steam, described cold reheated steam path is provided with and the by-pass switch interstage valve, and the cold passage interstage valve of reheated steam cold when by-pass switch is opened is opened, cooling the first reheater of cold reheated steam and the second reheater.
The utlity model has following outstanding beneficial effect:
1, the utility model detects the pressure in main steam line by pressure transducer is set, by Distributed Control System, to each power door operation, carried out the control of switch, can facilitate as required the control of modifying of each power door operation, have easy to operate, transformation is simple and the low beneficial effect of cost.
2, the utility model is before Combined Cycle Unit starts, check the vapor pressure of main steam line, if main steam line does not have pressure or vapor pressure lower than setting value, close draining valve and the emptying door of boiler side main steam line to empty exhaust, then open the front hydrophobic power door operation of steam turbine main steam valve, main steam line is vacuumized, taken the air in main steam line away, prevent that from there is air in main steam line, well solve vapour condenser when unit starting, the problem that vacuum is low occurred.
The accompanying drawing explanation
Fig. 1 is for solving the structural representation of the device that in the Combined Cycle Unit start-up course, condenser vacuum is low.
In Fig. 1:
The 1-main steam line; 2-the first reheater; 3-the second reheater; First pair of empty exhaust power door operation of 4-; Second pair of empty exhaust power door operation of 5-; The 6-sensor; 7-Distributed Control System DCS; The 8-by-pass switch; The hydrophobic power door operation of 9-; The 10-vapour condenser; 11-steam turbine porthole.
Fig. 2 and Fig. 3 are for the automatic unlatching logic diagram of M701F Combined Cycle Unit exhaust heat boiler reheater to empty steam discharge power door operation.
Embodiment:
Below in conjunction with drawings and Examples, the utility model is described in further detail:
Specific embodiment 1:
Fig. 1 forms a specific embodiment of the present utility model.
With reference to Fig. 1, the present embodiment comprises main steam line 1, on main steam line 1, be provided with the first reheater 2, the second reheater 3, vapour condenser 10 and steam turbine porthole 11, the first reheater 2, the second reheater 3 are serially connected in the entry end of main steam line 1 successively, the entry end of vapour condenser 10 connects the outlet end of main steam line 1, and the outlet end of vapour condenser 10 is connected on steam turbine by steam turbine porthole 11; Main steam line 1 is provided with two bypasses, and one of bypass is connected on exhaust heat boiler by first pair of empty exhaust power door operation 4, second pair of empty exhaust power door operation 5 successively, and two of bypass is connected on steam turbine by by-pass switch 8 and hydrophobic power door operation 9; At main steam line 1, be provided with pressure transducer 6, the signal output part of pressure transducer 6 connects the signal input part of Distributed Control System DCS7, and the signal output part of Distributed Control System DCS7 is connected to the control input end of first pair of empty exhaust power door operation 4, the second pair of empty exhaust power door operation 5 and hydrophobic power door operation 9; By pressure transducer 6, detect the vapor pressure of main steam lines 1 discharge pressure signal and to Distributed Control System DCS7, Distributed Control System DCS7, control accordingly the working state of first pair of empty exhaust power door operation 4, the second pair of empty exhaust power door operation 5 and hydrophobic power door operation 9.
In the present embodiment:
The input end of described the first reheater 2 is connected with cold reheated steam, described cold reheated steam path is provided with and by-pass switch 8 interstage valves, the cold passage interstage valve of reheated steam cold when by-pass switch 8 is opened is opened, cooling the first reheater 2 of cold reheated steam and the second reheater 3.
Working principle of the present utility model is as follows:
At first, with reference to Fig. 2, when combustion machine igniting 13 and reheated steam outlet conduit pressure transducer 6 recorded pressure less than L=0.05MPa, reheater was 1 to first pair of empty steam discharge power door operation 4, second pair of automatic start signal 14 of empty steam discharge power door operation 5.With reference to Fig. 3, reheater is set as zero to first pair of empty steam discharge power door operation 4, second pair of automatic start signal 14 perseverance of empty steam discharge power door operation 5.By such modification, M701F Combined Cycle Unit exhaust heat boiler reheater just can not opened, thereby avoid air to blow back into reheaing steam pipe first pair of empty steam discharge power door operation 4, second pair of empty steam discharge power door operation 5 in the unit starting process.In the unit starting process, before exhaust heat boiler reheater inlet flue gas temperature reached 371 ℃, steam turbine intermediate pressure by-pass 8 was opened simultaneously, and cold reheated steam 1 just can flow through exhaust heat boiler reheater 2,3 cooling reheaters.
Secondly, with reference to Fig. 1, before the M701F Combined Cycle Unit starts, while confirming that main steam line pressure is zero, confirm that boiler side all draining valves to sky of main steam line and emptying Men Jun close, open steam turbine main inlet throttle-stop valve 11,12 front hydrophobic power door operation 9, the vacuum by vapour condenser 10 vacuumizes main steam line, after the vacuum of vapour condenser 10 is recovered normally, then close hydrophobic power door operation 9 and throw automatically.
Owing to causing unit to open the main cause that in the machine process, vacuum is low, be, in main steam line, air is arranged, therefore before unit starting, if main steam line does not have pressure, should check that the boiler side main steam line closes the hydrophobic and emptying Men Jun of sky, open the front hydrophobic power door operation of steam turbine main inlet throttle-stop valve, main steam line is vacuumized, and after condenser vacuum recovers normally, then before closing the steam turbine main inlet throttle-stop valve, hydrophobic power door operation is also thrown automatically.Like this, the air in the front main steam line of the machine that opens has been taken away in advance, thereby can avoid opening the low phenomenon of vacuum in the machine process.
Under original logic design, combustion machine igniting and reheated steam pressure are during less than 0.05MPa, and reheater can be opened automatically to empty steam discharge power door operation.If during the igniting of combustion machine, main steam line does not have pressure, has large quantity of air and blows back into reheaing steam pipe, offset the front effect that main steam line is vacuumized of the machine that opens.The present embodiment is by Hangzhoupro pot demand of technical standard, and the exhaust heat boiler reheater should lead to steam before inlet flue gas temperature reaches 371 ℃ cooling.And according to the actual startup situation of M701F Combined Cycle Unit, before exhaust heat boiler reheater inlet flue gas temperature reached 371 ℃, the steam turbine intermediate pressure by-pass was all opened, can reach the logical cooling requirement of steam of exhaust heat boiler reheater.Simultaneously, in actual motion, the temperature rise rate of reheated steam also can meet the demands.Therefore, Hangzhoupro pot NG-M701F-R exhaust heat boiler reheater is modified to the logic of empty steam discharge first and second power door operation, make its maintenance normally closed.
Pass through said method, under the prerequisite that meets the exhaust heat boiler technical specification, before unit starting, taken the air in main steam line away, and revise that logic prevented from opening machine process Air again blow back into main steam line, thereby solved the low problem of condenser vacuum in the machine process that opens.
The above; it is only preferably specific embodiment of the utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the scope that the utility model discloses; according to the technical solution of the utility model and model utility design thereof, be equal to replacement or changed, all being belonged to protection domain of the present utility model.
Claims (2)
1. solve the low device of condenser vacuum in the Combined Cycle Unit start-up course, comprise main steam line (1), it is characterized in that: on main steam line (1), be provided with the first reheater (2), the second reheater (3), vapour condenser (10) and steam turbine porthole (11), the first reheater (2), the second reheater (3) are serially connected in the entry end of main steam line (1) successively, the entry end of vapour condenser (10) connects the outlet end of main steam line (1), and the outlet end of vapour condenser (10) is connected on steam turbine by steam turbine porthole (11); Main steam line (1) is provided with two bypasses, one of bypass is connected on exhaust heat boiler by first pair of empty exhaust power door operation (4), second pair of empty exhaust power door operation (5) successively, and two of bypass is connected on steam turbine by by-pass switch (8) and hydrophobic power door operation (9); At main steam line (1), be provided with pressure transducer (6), the signal output part of pressure transducer (6) connects the signal input part of Distributed Control System DCS (7), and the signal output part of Distributed Control System DCS (7) is connected to the control input end of first pair of empty exhaust power door operation (4), second pair of empty exhaust power door operation (5) and hydrophobic power door operation (9); By pressure transducer (6), detect vapor pressure the discharge pressure signal of main steam line (1) and to Distributed Control System DCS (7), Distributed Control System DCS (7), control accordingly the working state of first pair of empty exhaust power door operation (4), second pair of empty exhaust power door operation (5) and hydrophobic power door operation (9).
2. the low device of condenser vacuum in solution Combined Cycle Unit start-up course according to claim 1, it is characterized in that: the input end of described the first reheater (2) is connected with cold reheated steam, described cold reheated steam path is provided with and by-pass switch (8) interstage valve, when by-pass switch (8) while opening the cold passage interstage valve of cold reheated steam open, cooling the first reheater of cold reheated steam (2) and the second reheater (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203064063U CN203296834U (en) | 2013-05-30 | 2013-05-30 | Device for solving problem that vacuum degree in condenser is low in starting process of combined cycle unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203064063U CN203296834U (en) | 2013-05-30 | 2013-05-30 | Device for solving problem that vacuum degree in condenser is low in starting process of combined cycle unit |
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| Publication Number | Publication Date |
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| CN203296834U true CN203296834U (en) | 2013-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013203064063U Expired - Fee Related CN203296834U (en) | 2013-05-30 | 2013-05-30 | Device for solving problem that vacuum degree in condenser is low in starting process of combined cycle unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267425A (en) * | 2013-05-30 | 2013-08-28 | 深圳市广前电力有限公司 | Method and device for solving condenser low vacuum in combined cycle unit starting process |
-
2013
- 2013-05-30 CN CN2013203064063U patent/CN203296834U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267425A (en) * | 2013-05-30 | 2013-08-28 | 深圳市广前电力有限公司 | Method and device for solving condenser low vacuum in combined cycle unit starting process |
| CN103267425B (en) * | 2013-05-30 | 2015-05-13 | 深圳市广前电力有限公司 | Method and device for solving condenser low vacuum in combined cycle unit starting process |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131120 Termination date: 20160530 |