CN204327216U - Three grades of Bypass Control System - Google Patents
Three grades of Bypass Control System Download PDFInfo
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- CN204327216U CN204327216U CN201420854391.9U CN201420854391U CN204327216U CN 204327216 U CN204327216 U CN 204327216U CN 201420854391 U CN201420854391 U CN 201420854391U CN 204327216 U CN204327216 U CN 204327216U
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Abstract
The utility model discloses a kind of three grades of Bypass Control System for double reheat power generation sets, this double reheat power generation sets comprises boiler, superheater, single reheat device, secondary reheater, and vapour condenser, these three grades of Bypass Control System comprise high pressure turbine by, intermediate pressure by-pass and low voltage bypass, wherein high pressure turbine by is communicated with single reheat device fluid with superheater, intermediate pressure by-pass is communicated with secondary reheater fluid with single reheat device, and low voltage bypass is communicated with vapour condenser fluid with secondary reheater, 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 operating 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 utility model, the safety reliability that double reheat power generation sets runs greatly can be improved.
Description
Technical field
The utility model relates to field of thermal power, is specifically related to a kind of double reheat power generation sets three grades of Bypass Control System.
Background technique
The system bulky complex of double reheat power generation sets, once invest high, 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 are to the process important role such as the start and stop of unit, normal operation, fault treatment.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 complexity and the difficulty of control are very big.
Model utility content
The purpose of this utility model is to provide a kind of for three grades of Bypass Control System of double reheat power generation sets and the controlling method for these three grades of Bypass Control System, works the problem solving double reheat power generation sets safe and reliable operation.
According to one side of the present utility model, provide a kind of three grades of Bypass Control System for double reheat power generation sets, described double reheat power generation sets comprises boiler, superheater, single reheat device, secondary reheater, and vapour condenser, it is characterized in that: described three grades of Bypass Control System comprise high pressure turbine by, intermediate pressure by-pass and low voltage bypass, wherein said high pressure turbine by is communicated with described single reheat device fluid with described superheater, described intermediate pressure by-pass is communicated with described secondary reheater fluid with described single reheat device, and described low voltage bypass is communicated with described vapour condenser fluid with described secondary reheater, 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 operating modes of intermediate pressure by-pass or low voltage bypass.
Preferably, described high pressure turbine by comprises superheater outlet vapor pressure and detects transmitter, high other spray water valve, high other shut-off valve and high pressure bypass valve and ultra-high pressure cylinder, wherein, described superheater outlet vapor pressure detects transmitter and is used for detecting from described superheater vapor pressure out, and described high pressure bypass valve is used for controlling to enter the steam flow of described ultra-high pressure cylinder.
Preferably, described high pressure turbine by also comprises Temperature Detector, for detecting from superheater vapor (steam) temperature out.
Preferably, described intermediate pressure by-pass comprises middle branch mouth pressure transmitter, middle other shut-off valve, middle other spray water 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 vapor pressure out, and described intermediate pressure by-pass valve is used for controlling to enter the steam flow of described high-pressure cylinder.
Preferably, described intermediate pressure by-pass also comprises Temperature Detector, for detecting from described single reheat device vapor (steam) temperature out.
Preferably, described low voltage bypass comprises low branch mouth pressure transmitter, low other shut-off valve, low other spray water valve and intermediate pressure cylinder and low voltage bypass valve, wherein, described low branch mouth pressure transmitter is used for detecting from described secondary reheater vapor pressure out, and described low voltage bypass valve is used for controlling to enter the steam flow of described low pressure (LP) cylinder.
Preferably, described low voltage bypass also comprises Temperature Detector, for detecting from described secondary reheater vapor (steam) temperature out.
According to another aspect of the present utility model, provide a kind of controlling method for controlling double reheat power generation sets three grades of bypasses, described double reheat power generation sets comprises boiler, superheater, single reheat device, secondary reheater, and vapour condenser, described three grades of bypasses comprise high pressure turbine by, intermediate pressure by-pass, and low voltage bypass, described high pressure turbine by comprises superheater outlet vapor pressure and detects transmitter, ultra-high pressure cylinder and high pressure bypass valve, described intermediate pressure by-pass comprises middle branch mouth pressure transmitter, high-pressure cylinder and intermediate pressure by-pass valve, described low voltage bypass comprises low branch mouth pressure transmitter, intermediate pressure cylinder and low voltage bypass valve, described controlling method comprises following pattern: high septate mode formula, detect superheater outlet pressure and according to the aperture of this detection numerical control high pressure bypass valve, middle septate mode formula, detects from single reheat device single reheat vapor pressure out and according to the aperture of this single reheat Steam pressure control intermediate pressure by-pass valve, and low septate mode formula, to detect from secondary reheater secondary reheater vapor pressure out and according to the aperture of 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 described 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 comprises steam turbine fault under start-up mode, steam turbine operating mode, 15% load or shuts down pressure control mode and blowing out control mode, wherein said start-up mode comprise high other close start-up mode, descend valve position start-up mode and valve position restriction boosting start-up mode most.
Preferably, described high other trigger condition of closing start-up mode is that boiler has fire, and control strategy is that described high pressure bypass valve keeps closing, the trigger condition of described minimum valve position start-up mode is that after 12 minutes or when lighting a fire, superheater outlet pressure is higher than 15.8MPa ~ 16MPa in ignition of the boiler, and control strategy is open described high pressure bypass valve to control 5% ~ 30% by the aperture of described high pressure bypass valve simultaneously, the trigger condition of described valve position restriction boosting start-up mode is that described minimum valve position start-up mode continues after 1 ~ 10 minute or described superheater outlet pressure is greater than maximum red switch pressure, control strategy is: open described high pressure bypass valve, minimum for the valve position of described high pressure bypass valve aperture is limited between 8% ~ 18% simultaneously, maximum opening is limited between 50% ~ 100%, thus makes main steam pressure progressively be promoted to steam turbine red switch pressure, the trigger condition of described steam turbine operating mode is that described high pressure bypass valve is closed completely, 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 keep after complete shut-down, when after the higher 1.4MPa of described ultra-high pressure cylinder vapor pressure, high other overflow is outputed, the trigger condition of the steam turbine fault under described 15% load or shutdown pressure control mode is that load is less than 15%, described high pressure turbine by enters described steam turbine operating 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, thus make described ultra-high pressure cylinder vapor pressure progressively slide to down the pressure of steam turbine red switch again, when slide under described ultra-high pressure cylinder vapor pressure steam turbine again red switch pressure time, keep the valve seat opening of high pressure bypass valve, the trigger condition of described blowing out control mode is ignition of the boiler blackout, control strategy is for opening described high pressure bypass valve, described high pressure bypass valve is closed when sliding to the desired value preset under described ultra-high pressure cylinder vapor pressure, or after opening described high pressure bypass valve, ultra-high pressure cylinder vapor pressure described in Non-follow control.
Preferably, described middle septate mode formula comprises the steam turbine fault under start-up mode, steam turbine operating mode, 15% load or shuts down pressure control mode and blowing out control mode.
Preferably, the trigger condition of described start-up mode is: boiler has fire and described single reheat vapor pressure to be less than 3.5Mpa; Control strategy is: when single reheat vapor pressure is lower than 0.2Mpa, and described intermediate pressure by-pass valve keeps cutting out; When single reheat vapor pressure is higher than 0.2Mpa, described intermediate pressure by-pass valve is opened gradually, and as the aperture >10% of described intermediate pressure by-pass valve, minimum restriction is worked; And along with boiler load rising, the aperture of described intermediate pressure by-pass valve increases gradually, until the aperture of described intermediate pressure by-pass valve is 70%, the aperture of central pressure by-pass valve is increased to after 70%, middle side pressure setting value raises along with the rising of single reheat vapor pressure, aperture is between 70%-10%, until single reheat vapor pressure equals 3.5Mpa; The trigger condition of described steam turbine operating mode is: described intermediate pressure by-pass valve cuts out completely, 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 intermediate pressure by-pass valve, until keep after complete shut-down, when after the higher 0.5MPa of single reheat vapor pressure, middle other overflow is outputed; Under described 15% load, the trigger condition of steam turbine fault or shutdown pressure control mode is: load is less than 15%, intermediate pressure by-pass enters described steam turbine operating mode and digital electro-hydraulic control system sends " all steam taken over by steam turbine " instruction disappearance; Control strategy is: open described intermediate pressure by-pass valve, and the valve seat opening of described intermediate pressure by-pass valve is adjusted to 100%, then the valve seat opening of described intermediate pressure by-pass valve is progressively reduced, thus make single reheat vapor pressure progressively slide to down the pressure of steam turbine red switch again, when sliding to the pressure of steam turbine red switch again under single reheat vapor pressure, keep the valve seat opening of described intermediate pressure by-pass valve; And the trigger condition of described blowing out control mode is: ignition of the boiler blackout; Control strategy is: open described intermediate pressure by-pass valve, and closes described intermediate pressure by-pass valve when sliding to the desired value preset under single reheat vapor pressure, or Non-follow control pressure.
Preferably, described low septate mode formula to comprise under start-up mode, steam turbine operating mode, 15% load steam turbine fault or shuts down pressure control mode and blowing out control mode.
Preferably, the trigger condition of described start-up mode is: boiler has fire and double reheat vapor pressure to be less than 1.0Mpa; Control strategy is: when double reheat vapor pressure is lower than 0.2Mpa, and described low voltage bypass valve keeps cutting out; When double reheat vapor pressure is higher than 0.2Mpa, described low voltage bypass valve is opened gradually; As described low voltage bypass valve opening >10%, minimum restriction is worked; And along with boiler load rising, 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 is along with the rising of double reheat vapor pressure is by the speed rising calculated, the aperture of described low voltage bypass valve changes between 70%-10%, until double reheat vapor pressure equals 1.0Mpa; The trigger condition of described steam turbine operating mode is: described low voltage bypass valve complete shut-down, boiler have 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 keep after complete shut-down, the pressure set points on low side superposes the amount being no more than 4.32Mpa on original sliding pressure curve, and when after the higher 0.5MPa of double reheat vapor 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: the steam turbine operating mode that load is less than 15%, described low voltage bypass enters described low voltage bypass and digital electro-hydraulic control system send " all steam taken over by steam turbine " instruction and disappear; 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 vapor pressure progressively slides to down the pressure of steam turbine red switch again, when sliding to the pressure of steam turbine red switch again under double reheat vapor pressure, keep the valve seat opening of low voltage bypass valve; And the trigger condition of described blowing out control mode is: ignition of the boiler blackout; Control strategy is: open described low voltage bypass valve, closes described low voltage bypass valve when sliding to the desired value preset under double reheat vapor pressure, or after opening described low voltage bypass valve, Non-follow control pressure.
Owing to the utility model discloses a kind of three grades of Bypass Control System for double reheat power generation sets and having formulated the controlling method for double reheat power generation sets three grades of bypasses of complete set, thus greatly improve the safety reliability of double reheat power generation sets operation.
Accompanying drawing explanation
Fig. 1 is double reheat power generation sets three grades of Bypass Control System schematic diagram.
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 vapor 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 spray water 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 spray water 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 spray water valve of LP-.
Embodiment
Below with reference to accompanying drawing, preferred embodiment of the present utility model is described in detail, understands the purpose of this utility model, feature and advantage so that clearer.It should be understood that embodiment shown in the drawings is not the restriction to the utility model scope, and the connotation just in order to technical solutions of the utility model are described.
As shown in Figure 1, double reheat power generation sets comprises superheater 14, single reheat device 15, secondary reheater 16.Three grades of Bypass Control System comprise high pressure turbine by 11, intermediate pressure by-pass 12 and low voltage bypass 13.High pressure turbine by 11 is communicated with single reheat device 15 fluid with superheater 14, and intermediate pressure by-pass 12 is communicated with secondary reheater 16 fluid with single reheat device 15, and low voltage bypass 13 is communicated with secondary reheater 16 fluid.
Wherein, high pressure turbine by 11 comprises superheater outlet vapor pressure detection transmitter PT11, superheater outlet temperature detection transmitter TE11, high other spray water valve HP, high side 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 high other shut-off valve VH, high other spray water 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 communicated with ultra-high pressure cylinder 113 fluid.
During operation, open superheater outlet vapor pressure switch PS11, steam flows into high pressure turbine by 11 from superheater 14.Then according to actual conditions, a part of vapor stream also controls by high other spray water valve HP through high collateral branch road 111.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 through high collateral branch road 112 steam flow of ultra-high pressure cylinder 123.After the steam of high-pressure cylinder outflow and the vapor mixing from high collateral branch road 111, then flow to single reheat device 15 together and flow into intermediate pressure by-pass 12.
Intermediate pressure by-pass 12 comprises middle branch mouth pressure transmitter PT21, middle other shut-off valve VI, middle other spray water 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 wherein, collateral branch road 121 is provided with middle other shut-off valve VI, middle other spray water 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 communicated with high-pressure cylinder 123 fluid.
During operation, according to actual service condition, also control by middle other shut-off valve VI from collateral branch road 121 in the steam part flow direction 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 is used for controlling collateral branch road 122 in warp and flows into the steam flow of high-pressure cylinder 123.After the steam of high-pressure cylinder 123 outflow and the vapor mixing from middle collateral branch road 121, then flow to secondary reheater 16 together and flow into low voltage bypass 13.
Low voltage bypass 13 comprises low branch mouth pressure transmitter PT31, low other shut-off valve VI, low other spray water 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 spray water 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 communicated with intermediate pressure cylinder 133, low pressure (LP) cylinder 134 and coagulator 135 fluid.
During operation, according to actual service condition, 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 low pressure (LP) cylinder 133 from low collateral branch road 132.Low voltage bypass valve VIP is used for controlling to flow into through low collateral branch road 132 steam flow of low pressure (LP) cylinder 134.
According to another fermentation of the present utility model, provide a kind of controlling method for controlling double reheat power generation sets three grades of bypasses, described double reheat power generation sets comprises boiler, superheater, single reheat device, secondary reheater, and vapour condenser, described three grades of bypasses comprise high pressure turbine by, intermediate pressure by-pass, and low voltage bypass, described high pressure turbine by comprises superheater outlet vapor pressure and detects transmitter, ultra-high pressure cylinder and high pressure bypass valve, described intermediate pressure by-pass comprises middle branch mouth pressure transmitter, high-pressure cylinder and intermediate pressure by-pass valve, described low voltage bypass comprises low branch mouth pressure transmitter, intermediate pressure cylinder and low voltage bypass valve, described controlling method comprises following pattern:
High septate mode formula, detects superheater outlet pressure and according to the aperture of this detection numerical control high pressure bypass valve;
Middle septate mode formula, detects from single reheat device single reheat vapor pressure out and according to the aperture of this single reheat Steam pressure control intermediate pressure by-pass valve; And
Low septate mode formula, detects from secondary reheater secondary reheater vapor pressure out and according to the aperture of 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, high other start-up mode of closing
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 keeps closing.
The start-up mode of A2, minimum valve position
Trigger condition: any one in meeting the following conditions
(1) after ignition of the boiler 12min
(2) when lighting a fire, ultra-high pressure cylinder vapor pressure PT11 is higher than a certain pressure (15.8MPa)
(3) rear boiler of lighting a fire 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 of A3, valve position restriction boosting
Trigger condition: any one in meeting the following conditions
(1) after A2 mode continue for 1-10min
(2) ultra-high pressure cylinder vapor pressure PT11 has been greater than maximum permission 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, minimum for the valve position of high pressure bypass valve aperture is limited between 8% ~ 18% simultaneously, maximum opening is limited in 50% ~ 100%, makes boiler ultra-high pressure cylinder vapor pressure progressively be promoted to the red switch pressure of steam turbine.The red switch pressure of steam turbine is distinguished according to cold conditions, warm state, hot, very hot state, but is determined according to the temperature of steam turbine ultra-high pressure cylinder rotor no longer rigidly, and must within the specific limits (between 12MPa-16MPa).
B, steam turbine operating mode
Trigger condition: meet the following conditions simultaneously and just trigger
(1) high pressure bypass valve complete shut-down
(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 keep after complete shut-down, high other pressure set points can superpose certain amount (1.4MPa), the highest 35.2MPa that is no more than on original sliding pressure curve, and high side is closed completely.When after the higher 1.4MPa of ultra-high pressure cylinder vapor pressure PT11, high other overflow is outputed.
The pressure control mode of the steam turbine fault under C, 15% load or shutdown etc.
Trigger condition: meet the following conditions simultaneously and just trigger
(1) 15% load is less than
(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, thus make ultra-high pressure cylinder vapor pressure PT11 progressively slide to down the pressure of steam turbine red switch again, when sliding to the pressure of steam turbine red switch again under ultra-high pressure cylinder vapor pressure PT11, keep the valve seat opening of high pressure bypass valve.
The control mode of D, blowing out
Trigger condition: ignition of the boiler blackout
The aperture control strategy of high pressure bypass valve: open high pressure bypass valve, high pressure bypass valve is closed when sliding to desired value (16MPa) that preset under making ultra-high pressure cylinder vapor pressure PT11, or after opening high pressure bypass valve, operations staff's Non-follow control pressure.
Open control soon:
(1) 15% load is greater than and steam turbine trip or generator tripping
(2) ultra-high pressure cylinder vapor 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 vapor 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 other maintenance closedown builds the pressure; When single reheat device pressure P T21 is higher than 0.2Mpa, middle side is opened gradually; In the middle of other aperture >10%, minimum restriction is worked (lower bound is 10%, until grid-connected or MFT just disappears); Along with boiler raises load, middle side is opened to 70%.Central side is opened after 70%, and middle side pressure setting value is along with the rising of single reheat vapor pressure PT21 is by the speed rising calculated, and aperture is between 70%-10%, until single reheat vapor pressure PT21 to 3.5Mpa.
B, steam turbine operating mode
Trigger condition: meet the following conditions simultaneously and just trigger
(1) intermediate pressure by-pass valve complete shut-down
(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 keep after complete shut-down, the pressure set points on middle side can superpose certain amount (0.5MPa), the highest 13.71MPa that is no more than on original sliding pressure curve, and middle side is closed completely.When after the higher 0.5MPa of single reheat vapor pressure, middle other overflow is outputed.
The pressure control mode of the steam turbine fault under C, 15% load or shutdown etc.
Trigger condition: meet the following conditions simultaneously and just trigger
(1) 15% load is less than
(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, thus make single reheat vapor pressure progressively slide to down the pressure of steam turbine red switch again, when sliding to the pressure of steam turbine red switch again under single reheat vapor pressure, keep the valve seat opening of intermediate pressure by-pass valve.
The control mode of D, blowing out
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 sliding to desired value (1.0MPa) that preset under making single reheat vapor pressure, 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) vapour condenser liquid level is high
(3) vapour 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 vapor 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 other maintenance closedown builds the pressure; When secondary reheater pressure P T31 is higher than 0.2Mpa, low side is opened gradually; As low other aperture >10%, minimum restriction is worked (lower bound is 10%, until grid-connected or MFT just disappears); Along with boiler raises load, low side is opened to 70%.When low side is opened after to 70%, low side pressure setting value is along with the rising of double reheat vapor pressure PT31 is by the speed rising calculated, and aperture is between 70%-10%, until double reheat vapor pressure PT31 to 1.0Mpa.
B, steam turbine operating mode
Trigger condition: meet the following conditions simultaneously and just trigger
(1) low voltage bypass valve complete shut-down
(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 keep after complete shut-down, the pressure set points on low side can superpose certain amount (0.5MPa), the highest 4.32MPa that is no more than on original sliding pressure curve, and low side is closed completely.When after the higher 0.5MPa of double reheat vapor pressure PT31, low other overflow is outputed.
The pressure control mode of the steam turbine fault under C, 15% load or shutdown etc.
Trigger condition: meet the following conditions simultaneously and just trigger
(1) 15% load is less than
(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, thus make double reheat vapor pressure progressively slide to down the pressure of steam turbine red switch again, when sliding to the pressure of steam turbine red switch again under double reheat vapor pressure, keep the valve seat opening of low voltage bypass valve.
The control mode of D, blowing out
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 sliding to desired value (1.0MPa) that preset under making double reheat vapor pressure, 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) vapour condenser liquid level is high
(3) vapour condenser temperature is high
(4) low other pressure of desuperheating water PT33 is low
Below described preferred embodiment of the present utility model in detail, but it will be appreciated that, after having read above-mentioned instruction content of the present utility model, those skilled in the art can make various changes or modifications the utility model.These equivalent form of values fall within the application's appended claims limited range equally.
Claims (7)
1. three grades of Bypass Control System for double reheat power generation sets, described double reheat power generation sets comprises boiler, superheater, single reheat device, secondary reheater, and vapour condenser, it is characterized in that: described three grades of Bypass Control System comprise high pressure turbine by, intermediate pressure by-pass and low voltage bypass, wherein said high pressure turbine by is communicated with described single reheat device fluid with described superheater, described intermediate pressure by-pass is communicated with described secondary reheater fluid with described single reheat device, and described low voltage bypass is communicated with described vapour condenser fluid with described secondary reheater, 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 operating modes of intermediate pressure by-pass or low voltage bypass.
2. three grades of Bypass Control System according to claim 1, it is characterized in that: described high pressure turbine by comprises superheater outlet vapor pressure and detects transmitter, high other spray water valve, high other shut-off valve and high pressure bypass valve and ultra-high pressure cylinder, wherein, described superheater outlet vapor pressure detects transmitter and is used for detecting from described superheater vapor pressure out, and described high pressure bypass valve is used for controlling to enter the steam flow of described ultra-high pressure cylinder.
3. three grades of Bypass Control System according to claim 2, is characterized in that: described high pressure turbine by also comprises Temperature Detector, for detecting from superheater vapor (steam) temperature out.
4. three grades of Bypass Control System according to claim 1, it is characterized in that: described intermediate pressure by-pass comprises middle branch mouth pressure transmitter, middle other shut-off valve, middle other spray water 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 vapor pressure out, and described intermediate pressure by-pass valve is used for controlling to enter the steam flow of described high-pressure cylinder.
5. three grades of Bypass Control System according to claim 4, is characterized in that: described intermediate pressure by-pass also comprises Temperature Detector, for detecting from described single reheat device vapor (steam) temperature out.
6. three grades of Bypass Control System according to claim 1, it is characterized in that: described low voltage bypass comprises low branch mouth pressure transmitter, low other shut-off valve, low other spray water valve and intermediate pressure cylinder and low voltage bypass valve, wherein, described low branch mouth pressure transmitter is used for detecting from described secondary reheater vapor pressure out, and described low voltage bypass valve is used for controlling to enter the steam flow of described low pressure (LP) cylinder.
7. three grades of Bypass Control System according to claim 6, is characterized in that: described low voltage bypass also comprises Temperature Detector, for detecting from described secondary reheater vapor (steam) temperature out.
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| CN201420854391.9U CN204327216U (en) | 2014-12-25 | 2014-12-25 | Three grades of Bypass Control System |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104533549A (en) * | 2014-12-25 | 2015-04-22 | 中国电力工程顾问集团华东电力设计院 | Three-level bypass control system and control method thereof |
| CN108104887A (en) * | 2017-12-07 | 2018-06-01 | 中国神华能源股份有限公司 | The therrmodynamic system of double reheat |
| CN113324599A (en) * | 2021-04-21 | 2021-08-31 | 广西电网有限责任公司电力科学研究院 | Bypass capacity test system of FCB function thermal power generating unit |
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2014
- 2014-12-25 CN CN201420854391.9U patent/CN204327216U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104533549A (en) * | 2014-12-25 | 2015-04-22 | 中国电力工程顾问集团华东电力设计院 | Three-level bypass control system and control method thereof |
| CN104533549B (en) * | 2014-12-25 | 2016-06-29 | 中国电力工程顾问集团华东电力设计院有限公司 | Three grades of Bypass Control System and control method thereof |
| CN108104887A (en) * | 2017-12-07 | 2018-06-01 | 中国神华能源股份有限公司 | The therrmodynamic system of double reheat |
| CN108104887B (en) * | 2017-12-07 | 2020-10-16 | 中国神华能源股份有限公司 | Thermodynamic system with double reheating |
| CN113324599A (en) * | 2021-04-21 | 2021-08-31 | 广西电网有限责任公司电力科学研究院 | Bypass capacity test system of FCB function thermal power generating unit |
| CN113324599B (en) * | 2021-04-21 | 2022-06-24 | 广西电网有限责任公司电力科学研究院 | FCB function thermal power generating unit bypass capacity test system |
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