CN104533549B - Three grades of Bypass Control System and control method thereof - Google Patents
Three grades of Bypass Control System and control method thereof Download PDFInfo
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- CN104533549B CN104533549B CN201410838333.1A CN201410838333A CN104533549B CN 104533549 B CN104533549 B CN 104533549B CN 201410838333 A CN201410838333 A CN 201410838333A CN 104533549 B CN104533549 B CN 104533549B
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Abstract
The invention discloses a kind of three grades of Bypass Control System for double reheat power generation sets and control method, this double reheat power generation sets includes boiler, superheater, single reheat device, secondary reheater, and condenser, these three grades of Bypass Control System include high pressure turbine by, intermediate pressure by-pass and low voltage bypass, wherein high pressure turbine by and superheater and single reheat device fluid communication, intermediate pressure by-pass and single reheat device and secondary reheater fluid communication, and low voltage bypass and secondary reheater and condenser fluid communication, thus meeting high pressure turbine by, during the trigger condition of intermediate pressure by-pass or low voltage bypass, start high pressure turbine by, the different operational modes of intermediate pressure by-pass or low voltage bypass.By three grades of Bypass Control System for double reheat power generation sets of the present invention and control method, it is possible to be greatly improved the security reliability that double reheat power generation sets runs.
Description
Technical field
The present invention relates to field of thermal power, be specifically related to a kind of three grades of Bypass Control System of double reheat power generation sets.
Background technology
The system bulky complex of double reheat power generation sets, once invests height, but unit efficiency is high, is the developing direction of high effect cleaning coal electricity.
But, not yet there be putting into operation of double reheat power generation sets in China, more without ripe double reheat power generation sets Bypass Control System.For modern power station large unit unit, bypath system and control system thereof to process important roles such as the start and stop of unit, properly functioning, troubleshootings.Due to the existence of single reheat device, secondary reheater, double reheat power generation sets must configure high, medium and low three grades of bypasses, three grades of Bypass Control System complexity, and the complexity of control is very big with difficulty.
Summary of the invention
It is an object of the invention to provide a kind of for three grades of Bypass Control System of double reheat power generation sets and the control method for these three grades of Bypass Control System, act the problem solving double reheat power generation sets safe and reliable operation.
According to an aspect of the present invention, provide a kind of three grades of Bypass Control System for double reheat power generation sets, described double reheat power generation sets includes boiler, superheater, single reheat device, secondary reheater, and condenser, it is characterized in that: described three grades of Bypass Control System include high pressure turbine by, intermediate pressure by-pass and low voltage bypass, wherein said high pressure turbine by and described superheater and described single reheat device fluid communication, medium pressure bypass and described single reheat device and described secondary reheater fluid communication, and described low voltage bypass and described secondary reheater and described condenser fluid communication, thus meeting described high pressure turbine by, during the trigger condition of intermediate pressure by-pass or low voltage bypass, start described high pressure turbine by, the different operational modes of intermediate pressure by-pass or low voltage bypass.
Preferably, described high pressure turbine by includes superheater outlet steam pressure detection transmitter, high other water injection valve, high other shut-off valve and high pressure bypass valve and ultra-high pressure cylinder, wherein, described superheater outlet steam pressure detection transmitter is used for detecting from described superheater steam pressure out, and described high pressure bypass valve is used for controlling to enter the quantity of steam of described ultra-high pressure cylinder；Medium pressure bypass includes middle branch mouth pressure transmitter, middle other shut-off valve, middle other water injection valve and high pressure cylinder and intermediate pressure by-pass valve, wherein, described middle branch mouth pressure transmitter is used for detecting from described single reheat device steam pressure out, and medium pressure bypass valve is used for controlling to enter the steam flow of described high pressure cylinder；And described low voltage bypass includes low branch mouth pressure transmitter, low other shut-off valve, low other water injection valve and intermediate pressure cylinder and low voltage bypass valve, described low branch mouth pressure transmitter is used for detecting from described secondary reheater steam pressure out, and described low voltage bypass valve is used for controlling to enter the steam flow of described low pressure (LP) cylinder.
It is preferred that described high pressure turbine by also includes temperature detector, for detecting from superheater vapor (steam) temperature out；Medium pressure bypass also includes temperature detector, for detecting from described single reheat device vapor (steam) temperature out；And described low voltage bypass also includes temperature detector, for detecting from described secondary reheater vapor (steam) temperature out.
According to a further aspect in the invention, provide a kind of control method for controlling double reheat power generation sets three grades bypass, described double reheat power generation sets includes boiler, superheater, single reheat device, secondary reheater, and condenser, described three grades of bypasses include high pressure turbine by, intermediate pressure by-pass, and low voltage bypass, described high pressure turbine by includes superheater outlet steam pressure detection transmitter, ultra-high pressure cylinder and high pressure bypass valve, medium pressure bypass includes middle branch mouth pressure transmitter, high pressure cylinder and intermediate pressure by-pass valve, described low voltage bypass includes low branch mouth pressure transmitter, intermediate pressure cylinder and low voltage bypass valve, described control method includes following pattern: high septate mode formula, detection superheater outlet pressure the aperture according to this detection Data Control high pressure bypass valve；Middle septate mode formula, detects from single reheat device single reheat steam pressure out the aperture according to this single reheat Steam pressure control intermediate pressure by-pass valve；And low septate mode formula, detect from secondary reheater secondary reheater steam pressure out the aperture according to this secondary reheater Steam pressure control low voltage bypass valve；When meeting the trigger condition of described high septate mode formula, middle septate mode formula or low septate mode formula, start the different control strategies for described high septate mode formula, middle septate mode formula or low septate mode formula, and when meeting switch condition, perform present mode conversion.
Preferably; described high septate mode formula includes the steam turbine fault under start-up mode, steam turbine operational mode, 15% load or shuts down pressure control mode and blowing out control model, and wherein said start-up mode includes other start-up mode, minimum valve position start-up mode and the valve position closed of height and limits boosting start-up mode.
It is preferred that the described high other trigger condition closing start-up mode is that boiler has fire, control strategy is that described high pressure bypass valve remains turned-off；The trigger condition of described minimum valve position start-up mode is after ignition of the boiler 12 minutes or superheater outlet pressure is higher than 15.8MPa～16MPa during igniting, and control strategy is open described high pressure bypass valve to control the aperture of described high pressure bypass valve 5%～30% simultaneously；The trigger condition of described valve position restriction boosting start-up mode is after described minimum valve position start-up mode continues 1～10 minute or described superheater outlet pressure is more than maximum red switch pressure, control strategy is: open described high pressure bypass valve, the minimum aperture in valve position of described high pressure bypass valve is limited between 8%～18% simultaneously, maximum opening is limited between 50%～100%, so that main steam pressure steps up to steam turbine red switch pressure；The trigger condition of described steam turbine operational mode is that described high pressure bypass valve completely closes, boiler has been lighted a fire and digital electro-hydraulic control system sends " all steam taken over by steam turbine " instruction, control strategy is: turned down gradually by the valve seat opening of described high pressure bypass valve, until keeping behind full pass, when, after the described higher 1.4MPa of ultra-high pressure cylinder steam pressure, high other overflow is outputed；Steam turbine fault or the trigger condition of shutdown pressure control mode under described 15% load are that load is less than 15%, described high pressure turbine by enters described steam turbine operational mode, and " all steam taken over by steam turbine " instruction that described digital electro-hydraulic control system sends disappears, control strategy is for opening described high pressure bypass valve, and the valve seat opening of described high pressure bypass valve is adjusted to 100%, then the valve seat opening of described high pressure bypass valve is progressively reduced, so that described ultra-high pressure cylinder steam pressure is progressively snapped down to the pressure of steam turbine red switch again, when described ultra-high pressure cylinder steam pressure is snapped down to steam turbine red switch pressure again, keep the valve seat opening of high pressure bypass valve；The trigger condition of described blowing out control model is ignition of the boiler blackout, control strategy is for opening described high pressure bypass valve, described high pressure bypass valve is closed when described ultra-high pressure cylinder steam pressure is snapped down to desired value set in advance, or after opening described high pressure bypass valve, ultra-high pressure cylinder steam pressure described in Non-follow control.
It is preferred that described middle septate mode formula includes the steam turbine fault under start-up mode, steam turbine operational mode, 15% load or shuts down pressure control mode and blowing out control model.
It is preferred that the trigger condition of described start-up mode is: boiler has fiery and described single reheat steam pressure less than 3.5Mpa；Control strategy is: when single reheat steam pressure is lower than 0.2Mpa, medium pressure bypass valve remains turned-off；When single reheat steam pressure higher than 0.2Mpa time, medium pressure bypass valve is opened gradually, when the aperture of medium pressure bypass valve > 10% time, minimum restriction is worked；And along with boiler load raises, the aperture of medium pressure bypass valve is gradually increased, until the aperture of medium pressure bypass valve is 70%, the aperture of central pressure bypass valve increases to after 70%, middle lateral pressure setting value raises along with the rising of single reheat steam pressure, aperture is between 70% 10%, until single reheat steam pressure is equal to 3.5Mpa；The trigger condition of described steam turbine operational mode is: medium pressure bypass valve completely closes, boiler has been lighted a fire and digital electro-hydraulic control system sends " all steam taken over by steam turbine " instruction；Control strategy is: turned down gradually by the valve seat opening of medium pressure bypass valve, until keeping behind full pass, when, after the higher 0.5MPa of single reheat steam pressure, middle other overflow is outputed；Steam turbine fault or shut down the trigger condition of pressure control mode and be under described 15% load: load less than 15%, intermediate pressure by-pass enters described steam turbine operational mode and digital electro-hydraulic control system and sends " all steam taken over by steam turbine " instruction and disappear；Control strategy is: open medium pressure bypass valve, and the valve seat opening of medium pressure bypass valve is adjusted to 100%, then the valve seat opening of medium pressure bypass valve is progressively reduced, so that single reheat steam pressure is progressively snapped down to the pressure of steam turbine red switch again, when single reheat steam pressure is snapped down to the pressure of steam turbine red switch again, keep the valve seat opening of medium pressure bypass valve；And the trigger condition of described blowing out control model is: ignition of the boiler blackout；Control strategy is: opens medium pressure bypass valve, and closes medium pressure bypass valve or Non-follow control pressure when single reheat steam pressure is snapped down to desired value set in advance.
It is preferred that described low septate mode formula includes under start-up mode, steam turbine operational mode, 15% load steam turbine fault or shuts down pressure control mode and blowing out control model.
It is preferred that the trigger condition of described start-up mode is: boiler has fire and double reheat steam pressure less than 1.0Mpa；Control strategy is: when double reheat steam pressure is lower than 0.2Mpa, and described low voltage bypass valve remains turned-off；When double reheat steam pressure is higher than 0.2Mpa, described low voltage bypass valve is opened gradually；When described low voltage bypass valve opening > 10% time, minimum restriction is worked；And along with boiler load raises, described low voltage bypass valve opening increases to 70%, after the aperture of described low voltage bypass valve increases to 70%, the pressure set points of described low voltage bypass valve raises by the speed calculated along with raising of double reheat steam pressure, the aperture of described low voltage bypass valve is change between 70% 10%, until double reheat steam pressure is equal to 1.0Mpa；The trigger condition of described steam turbine operational mode is: described low voltage bypass valve closes entirely, boiler has been lighted a fire and digital electro-hydraulic control system sends " all steam taken over by steam turbine " instruction；Control strategy is: turned down gradually by the valve seat opening of described low voltage bypass valve, until keeping behind full pass, the pressure set points on low side is the superposition amount less than 4.32Mpa on original sliding pressure curve, when, after the higher 0.5MPa of double reheat steam pressure, low other overflow is outputed；Steam turbine fault or shut down the trigger condition of pressure control mode and be under described 15% load: load less than 15%, described low voltage bypass enters the steam turbine operational mode of described low voltage bypass and digital electro-hydraulic control system sends " all steam taken over by steam turbine " instruction and disappears；Control strategy is: open described low voltage bypass valve, and the valve seat opening of described low voltage bypass valve is adjusted to 100%, then the valve seat opening of described low voltage bypass valve is progressively reduced, thus double reheat steam pressure is progressively snapped down to the pressure of steam turbine red switch again, when double reheat steam pressure is snapped down to the pressure of steam turbine red switch again, keep the valve seat opening of low voltage bypass valve；And the trigger condition of described blowing out control model is: ignition of the boiler blackout；Control strategy is: open described low voltage bypass valve, closes described low voltage bypass valve when double reheat steam pressure is snapped down to desired value set in advance, or after opening described low voltage bypass valve, Non-follow control pressure.
Owing to the invention discloses a kind of three grades of Bypass Control System for double reheat power generation sets and having formulated the control method for double reheat power generation sets three grades bypass of complete set, thus greatly improving the security reliability that double reheat power generation sets runs.
Accompanying drawing explanation
Fig. 1 is three grades of Bypass Control System schematic diagrams of double reheat power generation sets.
Number in the figure:
11-high pressure turbine by；12-intermediate pressure by-pass；13-low voltage bypass；14-superheater；15-single reheat device；16-secondary reheater；PS11-superheater outlet steam pressure switch；PT11-superheater outlet steam pressure transmitter；TE11-superheater outlet vapor (steam) temperature；PT12-high branch mouth pressure transmitter；The other outlet temperature of TE12-height；The other shut-off valve of Vh-height；The other water injection valve of HP-height；PT21-single reheat device outlet vapor pressure transmitter；TE21-single reheat device outlet steam temperature；Branch mouth pressure transmitter in PT22-；Other outlet temperature in TE22-；Other shut-off valve in Vi-；Other water injection valve in IP-；PT31-secondary reheater outlet vapor pressure transmitter；TE31-secondary reheater outlet steam temperature；The low other spray flow of FT33-；The low other shut-off valve of Vl-；The low other water injection valve of LP-.
Detailed description of the invention
Below with reference to accompanying drawing, presently preferred embodiments of the present invention is described in detail, in order to become apparent from understanding the purpose of the present invention, feature and advantage.It should be understood that embodiment shown in the drawings is not limitation of the scope of the invention, and simply to illustrate that the connotation of technical solution of the present invention.
As it is shown in figure 1, double reheat power generation sets includes superheater 14, single reheat device 15, secondary reheater 16.Three grades of Bypass Control System include high pressure turbine by 11, intermediate pressure by-pass 12 and low voltage bypass 13.High pressure turbine by 11 is in fluid communication with superheater 14 and single reheat device 15, and intermediate pressure by-pass 12 is in fluid communication with single reheat device 15 and secondary reheater 16, and low voltage bypass 13 and secondary reheater 16 are in fluid communication.
Wherein, high pressure turbine by 11 includes superheater outlet steam pressure detection transmitter PT11, superheater outlet temperature detection transmitter TE11, high other water injection valve HP, high other shut-off valve VH and high pressure bypass valve VHP and ultra-high pressure cylinder 113.High pressure turbine by 11 is provided with high collateral branch road 111 and high collateral branch road 112, and high collateral branch road 111 is provided with the other shut-off valve VH of height, high other water injection valve HP, high branch mouth pressure transmitter PT12, high branch mouth temperature detector TE12.Branch road 112 is provided with high pressure bypass valve VHP and is in fluid communication with ultra-high pressure cylinder 113.
During operation, opening superheater outlet vapor pressure switch PS11, steam flows into high pressure turbine by 11 from superheater 14.Then according to practical situation, a part of steam flows through high collateral branch road 111 and is controlled by high other water injection valve HP.Another part flows into ultra-high pressure cylinder 113 through high collateral branch road 112.High pressure bypass valve VHP is used for controlling to flow into the steam flow of ultra-high pressure cylinder 113 through high collateral branch road 112.From the steam of high pressure cylinder outflow with after the steam on high collateral branch road 111, another rising flows to single reheat device 15 and flows into intermediate pressure by-pass 12.
Intermediate pressure by-pass 12 includes middle branch mouth pressure transmitter PT21, middle other shut-off valve VI, middle other water injection valve IP and intermediate pressure by-pass valve VIP and high pressure cylinder 123.Intermediate pressure by-pass 12 is provided with middle collateral branch road 121 and middle collateral branch road 122, and in wherein, collateral branch road 121 is provided with middle other shut-off valve VI, middle other water injection valve IP, middle branch mouth pressure transmitter PT22, middle branch mouth temperature detector TE22.Middle collateral branch road 122 is provided with intermediate pressure by-pass valve VHP and is in fluid communication with high pressure cylinder 123.
During operation, according to actually used situation, collateral branch road 121 being controlled by shut-off valve VI by middle in flowing to from the steam part of single reheat device 15, in another part warp, collateral branch road 122 flows in high pressure cylinder 123.Intermediate pressure by-pass valve VHP be used for controlling through in collateral branch road 122 flow into the quantity of steam of high pressure cylinder 123.From the steam of high pressure cylinder 123 outflow with after the steam on middle collateral branch road 121, another rising flows to secondary reheater 16 and flows into low voltage bypass 13.
Low voltage bypass 13 includes low branch mouth pressure transmitter PT31, low other shut-off valve VI, low other water injection valve LP and intermediate pressure cylinder 133, low voltage bypass valve VIP, low other spray flow detector FT33 and low other irrigation pressure detector FT33.Low voltage bypass 13 is provided with low collateral branch road 131 and low collateral branch road 132.Wherein, low collateral branch road 131 is provided with low other shut-off valve VI, low other water injection valve LP, low other spray flow detector FT33 and low other irrigation pressure detector FT33, and low collateral branch road 132 is provided with low voltage bypass valve VIP and is in fluid communication with intermediate pressure cylinder 133, low pressure (LP) cylinder 134 and coagulator 135.
During operation, according to actually used situation, the steam part from secondary reheater 16 flows into low collateral branch road 131 and flows through low other shut-off valve VI, and another part flows in intermediate pressure cylinder 133 from low collateral branch road 132.Low voltage bypass valve VIP is used for controlling to flow into the quantity of steam of intermediate pressure cylinder 133 through low collateral branch road 132.
Another fermentation according to the present invention, provide a kind of control method for controlling double reheat power generation sets three grades bypass, described double reheat power generation sets includes boiler, superheater, single reheat device, secondary reheater, and condenser, described three grades of bypasses include high pressure turbine by, intermediate pressure by-pass, and low voltage bypass, described high pressure turbine by includes superheater outlet steam pressure detection transmitter, ultra-high pressure cylinder and high pressure bypass valve, medium pressure bypass includes middle branch mouth pressure transmitter, high pressure cylinder and intermediate pressure by-pass valve, described low voltage bypass includes low branch mouth pressure transmitter, intermediate pressure cylinder and low voltage bypass valve, described control method includes following pattern:
High septate mode formula, detection superheater outlet pressure the aperture according to this detection Data Control high pressure bypass valve；
Middle septate mode formula, detects from single reheat device single reheat steam pressure out the aperture according to this single reheat Steam pressure control intermediate pressure by-pass valve；And
Low septate mode formula, detects from secondary reheater secondary reheater steam pressure out the aperture according to this secondary reheater Steam pressure control low voltage bypass valve；
When meeting the trigger condition of high pressure turbine by, intermediate pressure by-pass or low voltage bypass, start the different control strategies of high pressure turbine by, intermediate pressure by-pass or low voltage bypass, and when meeting switch condition, perform present mode conversion.
One: high septate mode formula
A1, the high other start-up mode closed
Trigger condition: boiler has fire
Switch condition: any one in meeting the following conditions
(1) boiler has fiery blackout
(2) high pressure turbine by enters A2 pattern
(3) high pressure turbine by enters A3 pattern
(4) high pressure turbine by enters B-mode
(5) high pressure turbine by enters C mode
(6) generator connecting in parallel with system
The aperture control strategy of high pressure bypass valve: high pressure bypass valve remains turned-off.
A2, minimum valve position start-up mode
Trigger condition: any one in meeting the following conditions
(1) after ignition of the boiler 12min
(2) during igniting, ultra-high pressure cylinder steam pressure PT11 is higher than a certain pressure (15.8MPa)
(3) after igniting, boiler adds up to boost and exceedes certain amount (about 0.1-1.4MPa)
Switch condition: any one in meeting the following conditions
(1) ignition of the boiler blackout
(2) high pressure turbine by enters A3 pattern
(3) high pressure turbine by enters B-mode
(4) high pressure turbine by enters C mode
The aperture control strategy of high pressure bypass valve: open high pressure bypass valve, with the valve seat opening of limit high pressure bypass valve, is limited in 5%～30% by the valve seat opening of high pressure bypass valve.
The start-up mode that A3, the restriction of valve position are boosted
Trigger condition: any one in meeting the following conditions
(1) after A2 mode continue for 1-10min
(2) ultra-high pressure cylinder steam pressure PT11 is more than maximum allowable red switch pressure (16MPa)
Switch condition: any one in meeting the following conditions
(1) ignition of the boiler blackout
(2) high pressure turbine by enters B-mode
(3) high pressure turbine by enters C mode
The aperture control strategy of high pressure bypass valve: open high pressure bypass valve, the minimum aperture in valve position of high pressure bypass valve is limited between 8%～18% simultaneously, maximum opening is limited in 50%～100%, makes boiler ultra-high pressure cylinder steam pressure step up the red switch pressure to steam turbine.The red switch pressure of steam turbine is distinguished according to cold conditions, temperature state, state hot, very hot no longer rigidly, but the temperature according to steam turbine ultra-high pressure cylinder rotor is determined, and must within the specific limits (between 12MPa 16MPa).
B, steam turbine operational mode
Trigger condition: meet the following conditions simultaneously and just trigger
(1) high pressure bypass valve closes entirely
(2) boiler is lighted a fire
(3) digital electro-hydraulic control system sends steam turbine and takes over all steam
Switch condition: any one in meeting the following conditions
(1) steam turbine tripping operation
(2) generator tripping
(3) high pressure turbine by enters C mode
The aperture control strategy of high pressure bypass valve: the valve seat opening of high pressure bypass valve is turned down gradually, until keeping behind full pass, high other pressure set points can superposition is certain on original sliding pressure curve amount (1.4MPa), the highest less than 35.2MPa, make to completely close by height.When, after the ultra-high pressure cylinder higher 1.4MPa of steam pressure PT11, high other overflow is outputed.
The pressure control mode of steam turbine fault or shutdown etc. under C, 15% load
Trigger condition: meet the following conditions simultaneously and just trigger
(1) less than 15% load
(2) high pressure turbine by enters B-mode
(3) digital electro-hydraulic control system sends steam turbine and takes over the disappearance of all vapor signal
Switch condition: digital electro-hydraulic control system sends steam turbine and takes over all steam
The aperture control strategy of high pressure bypass valve: open high pressure bypass valve, and the valve seat opening of high pressure bypass valve is adjusted to 100%, then the valve seat opening of high pressure bypass valve is progressively reduced, so that ultra-high pressure cylinder steam pressure PT11 is progressively snapped down to the pressure of steam turbine red switch again, when ultra-high pressure cylinder steam pressure PT11 is snapped down to the pressure of steam turbine red switch again, keep the valve seat opening of high pressure bypass valve.
D, blowing out control model
Trigger condition: ignition of the boiler blackout
The aperture control strategy of high pressure bypass valve: open high pressure bypass valve, closes high pressure bypass valve when making ultra-high pressure cylinder steam pressure PT11 be snapped down to desired value set in advance (16MPa), or after opening high pressure bypass valve, operations staff's Non-follow control pressure.
Open control soon:
(1) more than 15% load and steam turbine trip or generator tripping
(2) ultra-high pressure cylinder steam pressure PS11 is more than 35.2MPa
Two: middle septate mode formula
A, start-up mode
Trigger condition: meet the following conditions simultaneously and just trigger
(1) boiler has fire
(2) single reheat steam pressure PT21 is less than 3.5MPa
Switch condition: any one in meeting the following conditions
(1) intermediate pressure by-pass enters B-mode
(2) intermediate pressure by-pass enters C mode
(3) generator connecting in parallel with system
The aperture control strategy of intermediate pressure by-pass valve: when single reheat device pressure P T21 is lower than 0.2Mpa, middle side remains turned-off and builds the pressure；When single reheat device pressure P T21 is higher than 0.2Mpa, middle side is opened gradually；Central other aperture > 10%, (lower bound is 10%, just disappears) is worked in minimum restriction until grid-connected or MFT；Along with boiler raises load, middle side is opened to 70%.In the middle of other open after 70%, middle lateral pressure setting value raises by the speed calculated along with raising of single reheat steam pressure PT21, and aperture is between 70% 10%, until single reheat steam pressure PT21 to 3.5Mpa.
B, steam turbine operational mode
Trigger condition: meet the following conditions simultaneously and just trigger
(1) intermediate pressure by-pass valve closes entirely
(2) boiler is lighted a fire
(3) digital electro-hydraulic control system sends steam turbine and takes over all steam
Switch condition: any one in meeting the following conditions
(1) steam turbine tripping operation
(2) generator tripping
(3) intermediate pressure by-pass enters C mode
The aperture control strategy of intermediate pressure by-pass valve: the valve seat opening of intermediate pressure by-pass valve is turned down gradually, until keeping behind full pass, the pressure set points on middle side can superposition is certain on original sliding pressure curve amount (0.5MPa), the highest less than 13.71MPa, make middle side completely close.When, after the higher 0.5MPa of single reheat steam pressure, middle other overflow is outputed.
The pressure control mode of steam turbine fault or shutdown etc. under C, 15% load
Trigger condition: meet the following conditions simultaneously and just trigger
(1) less than 15% load
(2) intermediate pressure by-pass enters B-mode
(3) digital electro-hydraulic control system sends steam turbine and takes over the disappearance of all vapor signal
Switch condition: digital electro-hydraulic control system sends steam turbine and takes over all steam
The aperture control strategy of intermediate pressure by-pass valve: open intermediate pressure by-pass valve, and the valve seat opening of intermediate pressure by-pass valve is adjusted to 100%, then the valve seat opening of intermediate pressure by-pass valve is progressively reduced, so that single reheat steam pressure is progressively snapped down to the pressure of steam turbine red switch again, when single reheat steam pressure is snapped down to the pressure of steam turbine red switch again, keep the valve seat opening of intermediate pressure by-pass valve.
D, blowing out control model
Trigger condition: ignition of the boiler blackout
The aperture control strategy of intermediate pressure by-pass valve: open intermediate pressure by-pass valve, closes intermediate pressure by-pass valve when making single reheat steam pressure be snapped down to desired value set in advance (1.0MPa), or after opening intermediate pressure by-pass valve, operations staff's Non-follow control pressure.
Open control soon:
(1) high side is opened soon
Fast valving control:
(1) condenser vacuum is high
(2) condenser liquid level is high
(3) condenser temperature is high
(4) in, other pressure of desuperheating water PT23 is low
Three: low septate mode formula
A, start-up mode
Trigger condition: meet the following conditions simultaneously and just trigger
(1) boiler has fire
(2) double reheat steam pressure PT31 is less than 1.0MPa
Switch condition: any one in meeting the following conditions
(1) low voltage bypass enters B-mode
(2) low voltage bypass enters C mode
(3) generator connecting in parallel with system
The aperture control strategy of low voltage bypass valve: when secondary reheater pressure P T31 is lower than 0.2Mpa, low side remains turned-off and builds the pressure；When secondary reheater pressure P T31 is higher than 0.2Mpa, low side is opened gradually；When low other aperture > 10%, (lower bound is 10%, just disappears) is worked in minimum restriction until grid-connected or MFT；Along with boiler raises load, low side is opened to 70%.After low side is opened to 70%, low lateral pressure setting value raises by the speed calculated along with raising of double reheat steam pressure PT31, and aperture is between 70% 10%, until double reheat steam pressure PT31 to 1.0Mpa.
B, steam turbine operational mode
Trigger condition: meet the following conditions simultaneously and just trigger
(1) low voltage bypass valve closes entirely
(2) boiler is lighted a fire
(3) digital electro-hydraulic control system sends steam turbine and takes over all steam
Switch condition: any one in meeting the following conditions
(1) steam turbine tripping operation
(2) generator tripping
(3) low voltage bypass enters C mode
The aperture control strategy of low voltage bypass valve: the valve seat opening of low voltage bypass valve is turned down gradually, until keeping behind full pass, the pressure set points on low side can superposition is certain on original sliding pressure curve amount (0.5MPa), the highest less than 4.32MPa, make low side completely close.When, after the double reheat higher 0.5MPa of steam pressure PT31, low other overflow is outputed.
The pressure control mode of steam turbine fault or shutdown etc. under C, 15% load
Trigger condition: meet the following conditions simultaneously and just trigger
(1) less than 15% load
(2) low voltage bypass enters B-mode
(3) digital electro-hydraulic control system sends steam turbine and takes over the disappearance of all vapor signal
Switch condition: digital electro-hydraulic control system sends steam turbine and takes over all steam
The aperture control strategy of low voltage bypass valve: open low voltage bypass valve, and the valve seat opening of low voltage bypass valve is adjusted to 100%, then the valve seat opening of low voltage bypass valve is progressively reduced, so that double reheat steam pressure is progressively snapped down to the pressure of steam turbine red switch again, when double reheat steam pressure is snapped down to the pressure of steam turbine red switch again, keep the valve seat opening of low voltage bypass valve.
D, blowing out control model
Trigger condition: ignition of the boiler blackout
The aperture control strategy of low voltage bypass valve: open low voltage bypass valve, closes low voltage bypass valve when making double reheat steam pressure be snapped down to desired value set in advance (1.0MPa), or after opening low voltage bypass valve, operations staff's Non-follow control pressure.
Open control soon:
(1) high side is opened soon
Fast valving control:
(1) condenser vacuum is high
(2) condenser liquid level is high
(3) condenser temperature is high
(4) low other pressure of desuperheating water PT33 is low
Below presently preferred embodiments of the present invention has been described in detail, it is understood that after the above-mentioned teachings having read the present invention, the present invention can be made various changes or modifications by those skilled in the art.These equivalent form of values fall within the application appended claims limited range equally.
Claims (5)
1. the control method being used for controlling double reheat power generation sets three grades bypass, it is characterized in that, described double reheat power generation sets includes boiler, superheater, single reheat device, secondary reheater, and condenser, described three grades of bypasses include high pressure turbine by, intermediate pressure by-pass, and low voltage bypass, described high pressure turbine by includes superheater outlet steam pressure detection transmitter, ultra-high pressure cylinder and high pressure bypass valve, medium pressure bypass includes middle branch mouth pressure transmitter, high pressure cylinder and intermediate pressure by-pass valve, described low voltage bypass includes low branch mouth pressure transmitter, intermediate pressure cylinder and low voltage bypass valve, described control method includes following pattern:
High septate mode formula, detects from superheater steam pressure out the aperture according to this detection Data Control high pressure bypass valve；
Middle septate mode formula, detects from single reheat device single reheat steam pressure out the aperture according to this single reheat Steam pressure control intermediate pressure by-pass valve；And
Low septate mode formula, detects from secondary reheater secondary reheater steam pressure out the aperture according to this secondary reheater Steam pressure control low voltage bypass valve；
When meeting the trigger condition of described high septate mode formula, middle septate mode formula or low septate mode formula, start the different control strategies for described high septate mode formula, middle septate mode formula or low septate mode formula, and when meeting switch condition, perform present mode conversion；And
Described high septate mode formula includes the steam turbine fault under start-up mode, steam turbine operational mode, 15% load or shuts down pressure control mode and blowing out control model, and wherein said start-up mode includes other start-up mode, minimum valve position start-up mode and the valve position closed of height and limits boosting start-up mode；Wherein
The described high other trigger condition closing start-up mode is that boiler has fire, and control strategy is that described high pressure bypass valve remains turned-off；
If the trigger condition of described minimum valve position start-up mode is after ignition of the boiler 12 minutes or superheater outlet pressure is higher than 15.8MPa～16MPa during igniting, control strategy is open described high pressure bypass valve to control the aperture of described high pressure bypass valve 5%～30% simultaneously；
The trigger condition of described valve position restriction boosting start-up mode is after described minimum valve position start-up mode continues 1～10 minute or described superheater outlet pressure is more than maximum red switch pressure, control strategy is: open described high pressure bypass valve, the minimum aperture in valve position of described high pressure bypass valve is limited between 8%～18% simultaneously, maximum opening is limited between 50%～100%, so that main steam pressure steps up to steam turbine red switch pressure；
The trigger condition of described steam turbine operational mode is that described high pressure bypass valve completely closes, boiler has been lighted a fire and digital electro-hydraulic control system sends " all steam taken over by steam turbine " instruction, control strategy is: turned down gradually by the valve seat opening of described high pressure bypass valve, until keeping behind full pass, when, after the described higher 1.4MPa of ultra-high pressure cylinder steam pressure, high other overflow is outputed；
Steam turbine fault or the trigger condition of shutdown pressure control mode under described 15% load are that load is less than 15%, described high pressure turbine by enters described steam turbine operational mode, and " all steam taken over by steam turbine " instruction that described digital electro-hydraulic control system sends disappears, control strategy is for opening described high pressure bypass valve, and the valve seat opening of described high pressure bypass valve is adjusted to 100%, then the valve seat opening of described high pressure bypass valve is progressively reduced, so that described ultra-high pressure cylinder steam pressure is progressively snapped down to the pressure of steam turbine red switch again, when described ultra-high pressure cylinder steam pressure is snapped down to steam turbine red switch pressure again, keep the valve seat opening of high pressure bypass valve；
The trigger condition of described blowing out control model is ignition of the boiler blackout, control strategy is for opening described high pressure bypass valve, described high pressure bypass valve is closed when described ultra-high pressure cylinder steam pressure is snapped down to desired value set in advance, or after opening described high pressure bypass valve, ultra-high pressure cylinder steam pressure described in Non-follow control.
2. control method according to claim 1, it is characterised in that: described middle septate mode formula includes the steam turbine fault under start-up mode, steam turbine operational mode, 15% load or shuts down pressure control mode and blowing out control model.
3. control method according to claim 2, it is characterised in that:
The trigger condition of described start-up mode is: boiler has fiery and described single reheat steam pressure less than 3.5Mpa；
Control strategy is:
When single reheat steam pressure is lower than 0.2Mpa, medium pressure bypass valve remains turned-off；
When single reheat steam pressure higher than 0.2Mpa time, medium pressure bypass valve is opened gradually, when the aperture of medium pressure bypass valve > 10% time, minimum restriction is worked；And
Along with boiler load raises, the aperture of medium pressure bypass valve is gradually increased, until the aperture of medium pressure bypass valve is 70%, the aperture of central pressure bypass valve increases to after 70%, middle lateral pressure setting value raises along with the rising of single reheat steam pressure, aperture is between 70% 10%, until single reheat steam pressure is equal to 3.5Mpa；
The trigger condition of described steam turbine operational mode is: medium pressure bypass valve completely closes, boiler has been lighted a fire and digital electro-hydraulic control system sends " all steam taken over by steam turbine " instruction；Control strategy is: turned down gradually by the valve seat opening of medium pressure bypass valve, until keeping behind full pass, when, after the higher 0.5MPa of single reheat steam pressure, middle other overflow is outputed；
Steam turbine fault or shut down the trigger condition of pressure control mode and be under described 15% load: load less than 15%, intermediate pressure by-pass enters described steam turbine operational mode and digital electro-hydraulic control system and sends " all steam taken over by steam turbine " instruction and disappear；Control strategy is: open medium pressure bypass valve, and the valve seat opening of medium pressure bypass valve is adjusted to 100%, then the valve seat opening of medium pressure bypass valve is progressively reduced, so that single reheat steam pressure is progressively snapped down to the pressure of steam turbine red switch again, when single reheat steam pressure is snapped down to the pressure of steam turbine red switch again, keep the valve seat opening of medium pressure bypass valve；And
The trigger condition of described blowing out control model is: ignition of the boiler blackout；Control strategy is: opens medium pressure bypass valve, and closes medium pressure bypass valve or Non-follow control pressure when single reheat steam pressure is snapped down to desired value set in advance.
4. control method according to claim 1, it is characterised in that: described low septate mode formula includes under start-up mode, steam turbine operational mode, 15% load steam turbine fault or shuts down pressure control mode and blowing out control model.
5. control method according to claim 4, it is characterised in that:
The trigger condition of described start-up mode is: boiler has fire and double reheat steam pressure less than 1.0Mpa；Control strategy is:
When double reheat steam pressure is lower than 0.2Mpa, described low voltage bypass valve remains turned-off；
When double reheat steam pressure is higher than 0.2Mpa, described low voltage bypass valve is opened gradually；
When described low voltage bypass valve opening > 10% time, minimum restriction is worked；And
Along with boiler load raises, described low voltage bypass valve opening increases to 70%, after the aperture of described low voltage bypass valve increases to 70%, the pressure set points of described low voltage bypass valve raises by the speed calculated along with raising of double reheat steam pressure, the aperture of described low voltage bypass valve is change between 70% 10%, until double reheat steam pressure is equal to 1.0Mpa；
The trigger condition of described steam turbine operational mode is: described low voltage bypass valve closes entirely, boiler has been lighted a fire and digital electro-hydraulic control system sends " all steam taken over by steam turbine " instruction；Control strategy is: turned down gradually by the valve seat opening of described low voltage bypass valve, until keeping behind full pass, the pressure set points on low side is the superposition amount less than 4.32Mpa on original sliding pressure curve, when, after the higher 0.5MPa of double reheat steam pressure, low other overflow is outputed；
Steam turbine fault or shut down the trigger condition of pressure control mode and be under described 15% load: load less than 15%, described low voltage bypass enters the steam turbine operational mode of described low voltage bypass and digital electro-hydraulic control system sends " all steam taken over by steam turbine " instruction and disappears；Control strategy is: open described low voltage bypass valve, and the valve seat opening of described low voltage bypass valve is adjusted to 100%, then the valve seat opening of described low voltage bypass valve is progressively reduced, thus double reheat steam pressure is progressively snapped down to the pressure of steam turbine red switch again, when double reheat steam pressure is snapped down to the pressure of steam turbine red switch again, keep the valve seat opening of low voltage bypass valve；And
The trigger condition of described blowing out control model is: ignition of the boiler blackout；Control strategy is: open described low voltage bypass valve, closes described low voltage bypass valve when double reheat steam pressure is snapped down to desired value set in advance, or after opening described low voltage bypass valve, Non-follow control pressure.
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| CN105156161A (en) * | 2015-09-22 | 2015-12-16 | 湖南创元铝业有限公司 | Main reheat steam and main reheat steam bypass system |
| CN105673101B (en) * | 2016-01-07 | 2017-12-01 | 山西漳泽电力股份有限公司电力技术研究中心 | A kind of steam turbine and therrmodynamic system with depth peak regulating function |
| CN107165686B (en) * | 2016-03-08 | 2020-03-31 | 中国国电集团公司 | Secondary reheating thermal power generating unit bypass control method and system |
| CN107559056B (en) * | 2017-08-30 | 2023-09-08 | 联合瑞升（北京）科技有限公司 | Steam turbine increasing system with AGC function and adjusting method |
| CN108104881B (en) * | 2017-12-01 | 2020-02-18 | 中国神华能源股份有限公司 | High-voltage bypass control method, system and machine-readable storage medium |
| CN108301882B (en) * | 2018-03-12 | 2024-03-05 | 西安热工研究院有限公司 | Three-stage series-parallel bypass system of generator set and adjusting method thereof |
| CN111828110B (en) * | 2020-07-22 | 2023-02-24 | 西安热工研究院有限公司 | Control method for automatic steam protection of secondary reheating unit boiler MFT rear auxiliary steam |
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