CN107165686A

CN107165686A - A kind of double reheat fired power generating unit bypass control method and system

Info

Publication number: CN107165686A
Application number: CN201610131162.8A
Authority: CN
Inventors: 牛海明; 黄焕袍; 陈�峰; 李林; 侯新建; 张薇; 杨爽; 安凤栓
Original assignee: BEIJING GUODIAN ZHISHEN CONTROL TECHNOLOGY Co Ltd; China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
Current assignee: China Guodian Corp
Priority date: 2016-03-08
Filing date: 2016-03-08
Publication date: 2017-09-15
Anticipated expiration: 2036-03-08
Also published as: CN107165686B

Abstract

The invention discloses a kind of double reheat fired power generating unit bypass control method and system, including：Machine mode operation is opened with high pressure turbine by when high pressure turbine by reaches default Rule of judgment.The pattern includes：Judge whether boiler export initial pressure is more than unit very hot startup pressure, high lateral pressure regulating valve is opened to the first high other aperture according to judged result, the aperture is maintained until main steam pressure reaches the first desired value and maintains the value constant, high lateral pressure regulating valve maintains the aperture constant when opening to the second high other aperture, main steam pressure is risen to the first red switch pressure；The grid-connected rear high lateral pressure regulating valve of unit red switch is closed, main steam pressure random groups sliding pressure curvilinear motion, and the anti-Opening pressure of high lateral pressure regulating valve is superimposed on sliding pressure curve, when actual main steam pressure fails to maintain high lateral pressure regulating valve fully closed, open overflow operational mode.By the present invention program, the whole process Automated condtrol of double reheat fired power generating unit bypass can be realized.

Description

A kind of double reheat fired power generating unit bypass control method and system

Technical field

The present invention relates to the control technology of fired power generating unit bypass, espespecially a kind of double reheat fired power generating unit bypass Control method and system.

Background technology

Current China starts to greatly develop double reheat extra-supercritical unit, its therrmodynamic system of double reheat power generation sets Structure be different from single reheat unit, its steam turbine composition be respectively ultra-high pressure cylinder, high pressure cylinder, in Cylinder pressure, low pressure (LP) cylinder, it is bypassed in requisition for setting three-level：High pressure turbine by, intermediate pressure by-pass, low voltage bypass. Three-level bypass starts to the normal red switch of unit in unit starting, is incorporated into the power networks or disorderly closedown whole process is sent out Wave important function.Be embodied in reduction steam put to idle discharge, shortens the unit starting time, protect reheater, In terms of the solids erosion for reducing steam turbine throttle, air intake and blade.But due to double reheat power generation sets It is at the early-stage in China, therefore the full flow process automatic control method of a set of three-level bypass is there is no at present.Current state The three-level bypass control method inside used can not be realized since igniting to the normal red switch of unit, be incorporated into the power networks Or disorderly closedown is full-range automatically controls, control manually can not then give full play to bypass effect, especially Rinse in boiler heating boosting, boiler thermal-state, after steam turbine removal of load and main fuel trip (MFT) four There is the problem of can not being connected automatically in individual link, cause bypass to be in manual control mode, to the fast of unit Fast startup, safe operation, troubleshooting have significant impact.

The content of the invention

In order to solve the above-mentioned technical problem, the invention provides a kind of control of double reheat fired power generating unit bypass Method and system processed, can realize the whole process Automated condtrol of double reheat fired power generating unit bypass.

In order to reach the object of the invention, the invention provides a kind of double reheat fired power generating unit Bypass Control side Method, this method includes：

It is high when the high pressure turbine by corresponding with steam turbine super-pressure air cylinder group reaches default Rule of judgment Pressure bypass opens machine mode operation with high pressure turbine by.

Wherein, high pressure turbine by opens machine pattern and comprised the following steps：Judge boiler export initial pressure whether High lateral pressure is adjusted more than the very hot startup pressure of default steam-turbine unit, and according to judged result Valve is opened to the default first high other aperture, and maintains the first high other aperture until main steam pressure force value reaches Default first desired value；Maintain the first desired value constant, make high lateral pressure regulating valve with the combustion of boiler Burning is continued on；When the aperture of high lateral pressure regulating valve reaches the default second high other aperture, maintaining should Second high other aperture is constant；Main steam pressure force value will boost to the first red switch pressure with default first rate； After beginning red switch is grid-connected, high lateral pressure regulating valve is turned down with default second speed until fully closed；Work as height Enter overflow operational mode after lateral pressure regulating valve is fully closed, main steam pressure force value becomes random groups sliding pressure curve Change, and a fixed value is superimposed on sliding pressure curve and set as the anti-Opening pressure of high lateral pressure regulating valve Value, it is described high other when actual main steam pressure fails to maintain high lateral pressure regulating valve to keep full off state Pressure-regulating valve is opened.

Preferably, default Rule of judgment includes following any one or more：Detect any of boiler Oil reservoir is fought and the state is able to maintain that default time span, and detects any mill layer of boiler Run and the state is able to maintain that default very first time length.

Preferably, this method also includes：Judge that loop judges vapour by default four groups of state start-up modes Turbine unit is when high pressure turbine by is opened under machine pattern in cold start pattern, warm starting pattern, hot Any start-up mode in start-up mode and very hot startup pattern.

The determination methods of start-up mode include：In default four groups of state start-up modes judge loop respectively The temperature of rotor of super-pressure cylinder is inputted, steam turbine machine is determined according to default different temperature of rotor scope The start-up mode of group, and reset start-up mode after grid-connected；Wherein, default different rotor Temperature range respectively with cold start pattern, warm starting pattern, hot starting, hot start pattern and very hot startup Pattern is corresponded.

Preferably, this method also includes：

When the start-up mode of steam-turbine unit is cold start pattern, warm starting pattern and hot starting, hot start mould During formula, the default first high other aperture is a%；When the start-up mode of steam-turbine unit is very hot startup During pattern, the default first high other aperture is b%；Wherein, a and b are less than or equal to 100 just Integer, b is less than or equal to a.

When the start-up mode of steam-turbine unit is cold start pattern, the first desired value is default first Pressure value, wherein, x is arithmetic number；When the start-up mode of steam-turbine unit is warm starting pattern and heat During state start-up mode, the first desired value is the boiler pressure value before ignition of the boiler；When opening for steam-turbine unit When dynamic model formula is very hot startup pattern, the first desired value is the first red switch pressure value.

Preferably, judge whether the initial pressure of boiler export is more than the very hot state of default steam-turbine unit Start pressure, and be to the default first high other aperture by the unlatching of high lateral pressure regulating valve according to judged result Refer to：

When the initial pressure of boiler export is more than unit very hot startup pressure, by high lateral pressure regulating valve Opened with default third speed to the default first high other aperture, maintain fixed steam through-current capacity；When When the initial pressure of boiler export is less than or equal to unit very hot startup pressure, opened into high pressure turbine by The initial time of machine pattern, remains turned-off high lateral pressure regulating valve, until boiler starts to open pressure, by height Lateral pressure regulating valve is opened to the default first high other aperture with default fourth rate, maintains fixed steaming Vapour through-current capacity.

Preferably, this method also includes：When high pressure turbine by is not up to default Rule of judgment, by high pressure Run with high pressure turbine by shutdown mode on road.

Wherein, high pressure turbine by shutdown mode comprises the following steps：

In the case where shutting down not blowing out operating mode, open high lateral pressure regulating valve and keep default second time span, After default second time span, high lateral pressure regulating valve is set to be controlled to lead according to default control function Steam pressure；Wherein, steamed based on aperture during high default second time span of lateral pressure regulating valve holding The function of the steam flow amount of vapour, main steam pressure setting value is the function of fuel quantity.

In the case where shutting down blowing out operating mode, high lateral pressure regulating valve is kept to close with pressurize, when with very hot startup Pattern start when, then make high lateral pressure governor valve control main steam pressure with default fourth rate pressure release extremely Default second pressure value；When boiler needs maintenance, then pressure release is to 0Mpa.

Preferably, this method also includes：When the intermediate pressure by-pass corresponding with turbine high-pressure air cylinder group reaches During default Rule of judgment, intermediate pressure by-pass opens machine mode operation with intermediate pressure by-pass.

Wherein, intermediate pressure by-pass opens machine pattern and comprised the following steps：The initial of machine pattern is opened into intermediate pressure by-pass At the moment, middle lateral pressure regulating valve is remained turned-off, opened until high lateral pressure regulating valve and arrive the default 3rd During high other aperture, middle lateral pressure regulating valve is gradually opened into 100% with default 5th speed by 0, During the aperture of central lateral pressure regulating valve reaches default first during other aperture, other aperture in first is limited For aperture lower limit, and single reheat vapour pressure force value is risen into the second desired value with default 6th speed； The aperture of central lateral pressure regulating valve other aperture and single reheat steam pressure is less than in reaching default second During default second red switch pressure, single reheat vapour pressure force value is risen to second with default 7th speed The pressure value of red switch pressure；After beginning red switch is grid-connected, by middle lateral pressure regulating valve with the default 8th speed Rate is turned down until fully closed entrance overflow operational mode, and single reheat vapour pressure force value is maintained into default the Three pressure values, when single reheat vapour pressure force value exceedes default three pressure value, make middle other pressure Force regulating valve is opened.

Preferably, this method also includes：When intermediate pressure by-pass is not up to default Rule of judgment, by middle pressure Run with intermediate pressure by-pass shutdown mode on road.

Wherein, intermediate pressure by-pass shutdown mode comprises the following steps：

In the case where shutting down not blowing out operating mode, by middle lateral pressure governor valve control single reheat steam pressure, make Single reheat vapour pressure force value remains the pressure value of the second red switch pressure.

In the case where shutting down blowing out operating mode, lateral pressure regulating valve is closed with pressurize in holding；If opened with very hot state Dynamic model formula starts, by middle lateral pressure governor valve control single reheat steam pressure, with the default 9th speed Rate pressure release is to the second red switch pressure；When boiler needs maintenance, then pressure release is to 0MPa.

Preferably, this method also includes：When the low voltage bypass corresponding with air cylinder group in steam turbine reaches During default Rule of judgment, low voltage bypass opens machine mode operation with low voltage bypass.

Wherein, low voltage bypass opens machine pattern and comprised the following steps：The initial of machine pattern is opened into low voltage bypass At the moment, low lateral pressure regulating valve is remained turned-off, opened until high lateral pressure regulating valve and arrive the default 3rd High other aperture, and middle lateral pressure regulating valve is when opening the other aperture in the default 3rd, by low lateral pressure Regulating valve is gradually opened into 100% with default tenth speed by 0, when the aperture of low lateral pressure regulating valve When reaching the default first low other aperture, the first low other aperture is limited it as aperture lower limit, and will be secondary Reheated steam pressure value rises to default 4th pressure value with default 11st speed；When low lateral pressure is adjusted The aperture of section valve reaches the default second low other aperture and double reheat steam pressure is less than default 5th pressure During force value, double reheat vapour pressure force value is risen into default 3rd red switch pressure with default 12nd speed Power；After beginning red switch is grid-connected, low lateral pressure regulating valve is turned down with default 13rd speed until complete Put into overflow operational mode, double reheat vapour pressure force value is maintained into default 6th pressure value, when When double reheat vapour pressure force value exceedes default six pressure value, open low lateral pressure regulating valve.

Preferably, this method also includes：When low voltage bypass is not up to default Rule of judgment, by low pressure Run with low voltage bypass shutdown mode on road.

Wherein, low voltage bypass shutdown mode comprises the following steps：

In the case where shutting down not blowing out operating mode, by low lateral pressure governor valve control double reheat steam pressure, make Double reheat vapour pressure force value remains the pressure value of the 3rd red switch pressure.

In the case where shutting down blowing out operating mode, low lateral pressure regulating valve is set to close with pressurize；If with very hot startup Pattern starts, by low lateral pressure governor valve control double reheat steam pressure, with default tenth four-speed Rate pressure release is to the 3rd red switch pressure；When boiler needs maintenance, then pressure release is to 0MPa.

Preferably, this method also includes：

Opened by height in machine pattern, control loop is rinsed by default boiler thermal-state and detects boiler main steam Temperature and pressure, when detecting main steam increasing temperature and pressure to default first temperature and default 7th pressure During force value, high lateral pressure regulating valve is switched into constant DP control mode, maintains the 7th pressure value constant；And will Preset value is reduced to coal rate, and reduces steam-water separator water level, feedwater discharge capacity is increased, until boiler The water quality of reclaimed water meets default standard value.

Preferably, this method also includes：

In the case where shutting down not blowing out operating mode, when boiler do not stop and when steam turbine or generator failure, if main Vapour pressure force value reaches default 8th pressure value, then triggers default high other switching circuit and generation one Switching command, is sent to default high lateral pressure control loop, when default high lateral pressure control loop connects Receive after the switching command, make high pressure turbine by reenter high pressure turbine by by high pressure turbine by shutdown mode and open machine Boost phase in pattern.

Under the operating mode that steam turbine trips or generator tripping but boiler do not stop, and main steam pressure force value quilt When controlling in the range of default high other target pressure value, then trigger default high other switching circuit and produce One control instruction, is sent to default high lateral pressure control loop, when default high lateral pressure is controlled back Road is received after the control instruction, makes high pressure turbine by reenter high pressure turbine by by high pressure turbine by shutdown mode Open the increasing temperature and pressure stage in machine pattern.

Preferably, this method also includes：

Shut down not blowing out operating mode under, by default lower bound set loop, to high pressure turbine by regulating valve, The regulation aperture of intermediate pressure by-pass regulating valve and low voltage bypass regulating valve carries out lower bound setting；Wherein, high pressure The lower bound setting of bypass valve is determined that intermediate pressure by-pass is adjusted by the respective function of default main steam temperature The lower bound setting of valve and low voltage bypass regulating valve is default fixed aperture.

Preferably, this method also includes：

Loop is set by default pressure definite value, high pressure turbine by, intermediate pressure by-pass and low voltage bypass are existed The vapour pressure force value of different phase is pre-seted, and the elevation rate of the pressure value is pre-seted.

In order to achieve the above object, the invention also provides a kind of double reheat fired power generating unit Bypass Control system System, the system includes：High other control module.

High other control module is used for：When the high pressure turbine by corresponding with steam turbine super-pressure air cylinder group reach it is pre- If Rule of judgment when, control high pressure turbine by machine mode operation is opened with high pressure turbine by.

Wherein, high pressure turbine by opens machine pattern and comprised the following steps：Judge boiler export initial pressure whether High lateral pressure is adjusted more than the very hot startup pressure of default steam-turbine unit, and according to judged result Valve is opened to the default first high other aperture, and maintains the first high other aperture until main steam pressure force value reaches Default first desired value；Maintain the first desired value constant, make high lateral pressure regulating valve with the combustion of boiler Burning is continued on；When the aperture of high lateral pressure regulating valve reaches the default second high other aperture, the is maintained Two high other apertures are constant；Main steam pressure force value is made to boost to the first red switch pressure with default first rate；When After beginning red switch is grid-connected, high lateral pressure regulating valve is made to be turned down with default second speed until fully closed；Work as height After lateral pressure regulating valve is fully closed, into overflow operational mode, the pressure value random groups of main steam pressure are made to slide Curvilinear motion is pressed, and a fixed value is superimposed as the anti-unlatching of high lateral pressure regulating valve on sliding pressure curve Pressure set points, when actual main steam pressure fails to maintain high lateral pressure regulating valve to keep full off state, High lateral pressure regulating valve is opened.

Preferably, the system also judges loop including state start-up mode.

State start-up mode judges that loop is used for：Judge steam-turbine unit when high pressure turbine by is opened under machine pattern Which in cold start pattern, warm starting pattern, hot starting, hot start pattern and very hot startup pattern A kind of start-up mode.

State start-up mode judges that loop includes to the determination methods of start-up mode：In default four groups of states Start-up mode judges to input the temperature of rotor of super-pressure cylinder in loop respectively, turned according to default different Sub- temperature range determines the start-up mode of steam-turbine unit, and resets start-up mode after grid-connected； Wherein, default different temperature of rotor scope respectively with cold start pattern, warm starting pattern, heat State start-up mode and very hot startup pattern are corresponded.

Preferably,

When the start-up mode of steam-turbine unit is cold start pattern, the first desired value is default first Pressure value, wherein, x is arithmetic number；When the start-up mode of steam-turbine unit is the warm starting pattern During with hot starting, hot start pattern, the first desired value is the boiler pressure value before ignition of the boiler；Work as steam-turbine unit Start-up mode be very hot startup pattern when, the first desired value be red switch pressure value.

Preferably, high other control module judges whether the initial pressure of boiler export is more than default steam turbine The very hot startup pressure of unit, and opened high lateral pressure regulating valve to default the according to judged result One high other aperture refers to：

Preferably, high other control module is additionally operable to：When high pressure turbine by is not up to default Rule of judgment, High pressure turbine by is controlled to be run with high pressure turbine by shutdown mode.

In the case where shutting down not blowing out operating mode, open high lateral pressure regulating valve and keep default second time span, After default second time span, high lateral pressure regulating valve is set to control institute according to default control function State main steam pressure；Wherein, aperture during high default second time span of lateral pressure regulating valve holding is The function of the steam flow amount of main steam, main steam pressure force value is the function of fuel quantity.

In the case where shutting down blowing out operating mode, high lateral pressure regulating valve is kept to close with pressurize, when with very hot startup Pattern start when, then make high lateral pressure governor valve control main steam pressure with default fourth rate pressure release extremely Default second pressure value；When boiler needs maintenance, then pressure release is to 0Mpa；Wherein, y is arithmetic number.

Preferably, the system also includes middle other control module；Middle other control module is used for：When with steam turbine When the corresponding intermediate pressure by-pass of high-pressure cylinder group reaches default Rule of judgment, control intermediate pressure by-pass is with middle pressure Machine mode operation is opened in bypass.

Wherein, intermediate pressure by-pass opens machine pattern and comprised the following steps：The initial of machine pattern is opened into intermediate pressure by-pass At the moment, middle lateral pressure regulating valve is remained turned-off, opened until high lateral pressure regulating valve and arrive the default 3rd During high other aperture, middle lateral pressure regulating valve is gradually opened into 100% with default 5th speed by 0, During the aperture of central lateral pressure regulating valve reaches default first during other aperture, other aperture in first is limited For aperture lower limit, and single reheat vapour pressure force value is risen into the second desired value with default 6th speed； The aperture of central lateral pressure regulating valve other aperture and single reheat steam pressure is less than in reaching default second During default second red switch pressure, single reheat vapour pressure force value is risen to second with default 7th speed The pressure value of red switch pressure；After beginning red switch is grid-connected, by middle lateral pressure regulating valve with the default 8th speed Rate is turned down up to fully closed, into overflow operational mode, single reheat vapour pressure force value is maintained default 3rd pressure value, when single reheat vapour pressure force value exceedes default three pressure value, makes middle lateral pressure Regulating valve is opened.

Preferably,

Middle other control module is additionally operable to：When intermediate pressure by-pass is not up to default Rule of judgment, pressed in control Bypass is run with intermediate pressure by-pass shutdown mode.

In the case where shutting down blowing out operating mode, lateral pressure regulating valve is closed with pressurize in holding；If opened with very hot state Dynamic model formula starts, by middle lateral pressure governor valve control main steam pressure, with default 9th speed pressure release To the second red switch pressure；When boiler needs maintenance, then pressure release is to 0MPa.

Preferably, the system also includes low other control module.

Low other control module is used for：When the low voltage bypass corresponding with air cylinder group in steam turbine reach it is default Rule of judgment when, control low voltage bypass machine mode operation is opened with low voltage bypass.

Wherein, low voltage bypass opens machine pattern and comprised the following steps：The initial of machine pattern is opened into low voltage bypass At the moment, low lateral pressure regulating valve is remained turned-off, opened until high lateral pressure regulating valve and arrive the default 3rd High other aperture, and middle lateral pressure regulating valve is when opening the other aperture in the default 3rd, by low lateral pressure Regulating valve is gradually opened into 100% with default tenth speed by 0, when the aperture of low lateral pressure regulating valve When reaching the default first low other aperture, the first low other aperture is limited it as aperture lower limit, and will be secondary Reheated steam pressure value rises to default 4th pressure value with default 11st speed；When low lateral pressure is adjusted The aperture of section valve reaches the default second low other aperture and double reheat steam pressure is less than the default 5th During pressure value, double reheat vapour pressure force value is risen into default 3rd red switch with default 12nd speed Pressure；When start red switch it is grid-connected after, low lateral pressure regulating valve is turned down with default 13rd speed until It is fully closed, into overflow operational mode, double reheat vapour pressure force value is maintained into default 6th pressure value, When double reheat vapour pressure force value exceedes default six pressure value, open low lateral pressure regulating valve.

Preferably,

Low other control module is additionally operable to：When low voltage bypass is not up to default Rule of judgment, low pressure is controlled Bypass is run with low voltage bypass shutdown mode.

Wherein, low voltage bypass shutdown mode comprises the following steps：

Preferably, the system also includes：Boiler thermal-state rinses control loop.

Boiler thermal-state, which rinses control loop, to be used for：Opened by height in machine pattern, detect the temperature of boiler main steam Degree and pressure, when detecting main steam increasing temperature and pressure to default first temperature and default 7th pressure value When, high lateral pressure regulating valve is switched into constant DP control mode, maintains the 7th pressure value constant；And coal will be given Rate is reduced to preset value, and reduces steam-water separator water level, feedwater discharge capacity is increased, until boiler reclaimed water Water quality meet default standard value.

Preferably, the system also includes high other switching circuit.

High other switching circuit is used for：In the case where shutting down not blowing out operating mode, when boiler does not stop and steam turbine or hair During electrical fault, if main steam pressure force value reaches default 8th pressure value, a switching command is produced, Control module by height is sent to, after control module receives switching command by height, high pressure turbine by is made by height Pressure bypass shutdown mode reenters high pressure turbine by and opens boost phase in machine pattern.

High other switching circuit is additionally operable to：Under the operating mode that steam turbine trips or generator tripping but boiler do not stop, And when main steam pressure force value is controlled in the range of default high other target pressure value, produce a control Instruction, is sent to control module by height, after control module receives control instruction by height, makes by high pressure Route high pressure turbine by shutdown mode reenters high pressure turbine by and opens increasing temperature and pressure stage in machine pattern.

Preferably, the system also includes lower bound setting loop.

Lower bound setting loop is used for：In the case where shutting down not blowing out operating mode, by high pressure turbine by regulating valve, middle pressure The regulation aperture of road regulating valve and low voltage bypass regulating valve carries out lower bound setting；Wherein, high pressure turbine by is adjusted The lower bound setting of section valve determines by the respective function of default main steam temperature, intermediate pressure by-pass regulating valve and low The lower bound setting for pressing bypass valve is default fixed aperture.

Preferably, the system also includes pressure definite value setting loop.

Pressure definite value sets loop to be used for：By default pressure definite value set loop, to high pressure turbine by, Intermediate pressure by-pass and low voltage bypass are pre-seted in the vapour pressure force value of different phase, and to pressure value Elevation rate is pre-seted.

Compared with prior art, the present invention includes：When the high pressure corresponding with steam turbine super-pressure air cylinder group When bypass reaches default Rule of judgment, high pressure turbine by opens machine mode operation with high pressure turbine by.Wherein, it is high Pressure bypass is opened machine pattern and comprised the following steps：Judge whether the initial pressure of boiler export is more than default vapour The very hot startup pressure of turbine unit, and opened high lateral pressure regulating valve to default according to judged result The first high other aperture, and maintain the first high other aperture until main steam pressure force value reaches the default first phase Prestige value；Maintain the first desired value constant, high lateral pressure regulating valve is continued on the burning of boiler； When the aperture of high lateral pressure regulating valve reaches the default second high other aperture, the second high other aperture is maintained It is constant；Main steam pressure force value will boost to the first red switch pressure with default first rate；When start red switch simultaneously After net, high lateral pressure regulating valve is turned down with default second speed until fully closed；When high lateral pressure regulating valve Enter overflow operational mode after fully closed, main steam pressure force value is by random groups sliding pressure curvilinear motion, and in sliding pressure A fixed value is superimposed on curve as the anti-Opening pressure setting value of high lateral pressure regulating valve, as actual master When steam pressure fails to maintain high lateral pressure regulating valve holding full off state, high lateral pressure regulating valve is opened. By the solution of the present invention, the whole process Automated condtrol of double reheat fired power generating unit bypass can be realized.

Other features and advantages of the present invention will be illustrated in the following description, also, partly from froming the perspective of Become apparent, or understood by implementing the present invention in bright book.The purpose of the present invention is excellent with other Point can be realized and obtained by specifically noted structure in specification, claims and accompanying drawing.

Brief description of the drawings

Accompanying drawing is used for providing further understanding technical solution of the present invention, and constitutes one of specification Point, it is used to explain technical scheme together with embodiments herein, does not constitute to the present invention The limitation of technical scheme.

Fig. 1 bypasses double reheat power generation sets system construction drawing for the three-level of the present invention；

Fig. 2 is the high pressure turbine by control flow chart of the double reheat fired power generating unit of the present invention；

Fig. 3 is the intermediate pressure by-pass control flow chart of the double reheat fired power generating unit of the present invention；

Fig. 4 is the low voltage bypass control flow chart of the double reheat fired power generating unit of the present invention；

Fig. 5 is double reheat fired power generating unit Bypass Control System composition frame chart of the invention.

Embodiment

For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing Embodiments of the invention are described in detail.It should be noted that in the case where not conflicting, this Shen Please in embodiment and the feature in embodiment can mutually be combined.

The step of the flow of accompanying drawing is illustrated can such as one group computer executable instructions computer Performed in system.And, although logical order is shown in flow charts, but in some cases, Can be with the step shown or described by being performed different from order herein.

As shown in figure 1, be the double reheat power generation sets system construction drawing for employing three-level bypass of the present invention, can To see high pressure turbine by, intermediate pressure by-pass and low voltage bypass, can be briefly referred to as here other height, middle side and Low side, is arranged in series.

Based on above-mentioned structure chart, in order to reach the object of the invention, the invention provides a kind of double reheat Fired power generating unit bypass control method, as shown in Figures 2 to 4.

The present invention is set to high pressure turbine by by following control strategy first according to steam-turbine unit Booting sequence Meter：It is high when the high pressure turbine by corresponding with steam turbine super-pressure air cylinder group reaches default Rule of judgment Pressure bypass opens machine mode operation with high pressure turbine by, as shown in Figure 2.

Preferably, the default Rule of judgment includes following any one or more：1) boiler is detected Any oil reservoir is fought and the state is able to maintain that default time span, herein, can be taken based on 4 3 principle is detected, i.e. if 4 layers of oil reservoir, can detect whether wherein 3 layers have fire, when So, this is a specific embodiment of the invention, and other principles are also based in other schemes and are entered Row judges.2) detect any mill layer operation of boiler and the state is able to maintain that the default very first time Length.Default time span in above-mentioned two Rule of judgment can be selected 125 seconds, and the time value is By a preferred value of field practice.

High pressure turbine by opens machine pattern and comprised the following steps：Judge whether the initial pressure of boiler export is more than in advance If steam-turbine unit very hot startup pressure, in embodiments of the present invention, the very hot startup pressure It can be 16MPa, and be opened the unlatching of high lateral pressure regulating valve to the default first high side according to judged result Degree, the first high other aperture is related to the start-up mode of steam-turbine unit, will be detailed in following content Introduce several start-up modes, the determination methods of this several start-up mode and the first high side of steam-turbine unit The physical relationship of aperture and this several start-up mode.Open high to default first in high lateral pressure regulating valve After other aperture, the first high other aperture can be maintained until main steam pressure force value reaches default first desired value, And maintain the first desired value constant, high lateral pressure regulating valve is continued on the burning of boiler；Here, First desired value of main steam pressure is related still to the start-up mode of Steam Turbine, and physical relationship will be rear It is discussed in detail in continuous content.With continuing on for high lateral pressure regulating valve, when high lateral pressure regulating valve When aperture reaches the default second high other aperture, maintain the second high other aperture constant, it is preferable that this Two high other apertures can be 30%；Main steam pressure force value will boost to the first red switch pressure with default first rate Power, the first red switch pressure is also related to the start-up mode of above-mentioned Steam Turbine here, and physical relationship will be It is discussed in detail in subsequent content.After beginning red switch is grid-connected, high lateral pressure regulating valve is with the default second speed Rate is gradually turned down until fully closed；Enter overflow operational mode, main steam after high lateral pressure regulating valve is fully closed Pressure value is superimposed a fixed value as pressure by height by random groups sliding pressure curvilinear motion, and on sliding pressure curve The anti-Opening pressure setting value of force regulating valve, it is preferable that the anti-Opening pressure setting value can be 1MPa, When actual main steam pressure fails to maintain high lateral pressure regulating valve to keep full off state, high lateral pressure regulation Valve is opened.

We will be described in detail to the four of steam-turbine unit kinds of start-up modes below.

Four kinds of start-up modes of steam-turbine unit include：It is cold start pattern, warm starting pattern, hot Start-up mode and very hot startup pattern.

Preferably, this method also includes：4 kinds of states startup mould that unit is added in machine pattern is opened by height Formula judges loop, judges that loop judges steam-turbine unit in high pressure by default four groups of state start-up modes Bypass is when opening under machine pattern in cold start pattern, warm starting pattern, hot starting, hot start pattern and very hot Any start-up mode in state start-up mode.The state start-up mode judges 4 groups of loop point, every group of bag Include lower bound monitor and door, NOT gate, impulse generator, RS holding registers, OR gate.

The determination methods of start-up mode include：In default four groups of state start-up modes judge loop respectively The temperature of rotor of super-pressure cylinder is inputted, steam turbine machine is determined according to default different temperature of rotor scope The start-up mode of group, and reset start-up mode after grid-connected；Wherein, default different rotor Temperature range respectively with cold start pattern, warm starting pattern, hot starting, hot start pattern and very hot startup Pattern is corresponded.Preferably, ultra-high pressure cylinder temperature of rotor<200 DEG C are cold start pattern, 200 DEG C ~380 DEG C are warm starting pattern, and 380 DEG C~540 DEG C are hot starting, hot start pattern,>540 DEG C are that very hot state is opened Dynamic model formula.

In the present invention, the control targe value of high lateral pressure is provided according to each starting state, it is comprehensively succinct Realize the setting to main steam pressure in control strategy.

Based on the introduction of above-mentioned four kinds of start-up modes, the first high other open circuit being described in detail below in the present invention With the relation of four kinds of start-up modes.

Specifically, when the start-up mode of steam-turbine unit is cold start pattern, warm starting pattern and heat During state start-up mode, the default first high other aperture is a%, it is preferable that the a% can be 8%, this In it should be noted that under these three start-up modes, the first high other aperture can be with identical, can also It is different；When the start-up mode of steam-turbine unit is very hot startup pattern, the default first high other aperture For b%, it is preferable that the b% can be 5%；Wherein, a and b are just whole less than or equal to 100 Number, b is less than or equal to a.

The relation of the first desired value and four kinds of start-up modes in the present invention is described in detail below.

When the start-up mode of steam-turbine unit is cold start pattern, the first desired value is default first Pressure value, it is preferable that the first pressure value can be 0.5MPa；When the start-up mode of steam-turbine unit is When warm starting pattern and hot starting, hot start pattern, the first desired value is the boiler pressure value before ignition of the boiler； When the start-up mode of steam-turbine unit is very hot startup pattern, the first desired value is the first red switch pressure Value.

When the initial pressure of boiler export is more than unit very hot startup pressure, by high lateral pressure regulating valve Opened with default third speed to the default first high other aperture, maintain fixed steam through-current capacity, it is excellent Selection of land, the third speed can be 5%/min；When the initial pressure of boiler export is less than or equal to unit pole During hot starting, hot start pressure, the initial time of machine pattern is being opened into high pressure turbine by, is making high lateral pressure regulating valve Remain turned-off, until boiler starts to open pressure, high lateral pressure regulating valve is opened with default fourth rate and arrived Default first high other aperture, maintains fixed steam through-current capacity, prevents reheater dry combustion method.

In embodiments of the present invention, the four kinds of start-up modes of the fourth rate also with above-mentioned steam-turbine unit It is related.Specifically, when the start-up mode of steam-turbine unit is cold start pattern, the fourth rate is C%/min, it is preferable that c%/min can be 10%/min；When the start-up mode of steam-turbine unit is warm state During start-up mode, the fourth rate is d%/min, it is preferable that d%/min can be 10%/min；When When the start-up mode of steam-turbine unit is hot starting, hot start pattern, the fourth rate is e%/min, it is preferable that E%/min can be 8%/min.

The relation of the first red switch pressure in the present invention and four kinds of start-up modes is described in detail below.

Specifically, when the start-up mode of steam-turbine unit is cold start pattern, the first red switch pressure For fMPa, it is preferable that the fMPa can be 8MPa；When the start-up mode of steam-turbine unit is warm state During start-up mode, the first red switch pressure is jMPa, it is preferable that the jMPa can be 8MPa；； When the start-up mode of steam-turbine unit is hot starting, hot start pattern, the first red switch pressure is hMPa, excellent Selection of land, the hMPa can be 10MPa；When the start-up mode of steam-turbine unit is very hot startup pattern When, the first red switch pressure is iMPa, it is preferable that the iMPa can be 14MPa.

Preferably, this method also includes：When high pressure turbine by is not up to default Rule of judgment, by high pressure Road is run with high pressure turbine by shutdown mode, as shown in Figure 2.

Wherein, high pressure turbine by shutdown mode include shut down not blowing out and shut down two kinds of operating modes of blowing out, this two Plant under operating mode, high pressure turbine by shutdown mode comprises the following steps：

In the case where shutting down not blowing out operating mode, open high lateral pressure regulating valve and keep default second time span, Preferably, second time span can be 5S, after default second time span, make pressure by height Force regulating valve controls main steam pressure according to default control function；Wherein, high lateral pressure regulating valve is kept Aperture during default second time span is the function of the steam flow amount of main steam, main steam pressure setting value For the function of fuel quantity.

In the case where shutting down blowing out (MFT) operating mode, high lateral pressure regulating valve is kept to close with pressurize, when with pole When hot starting, hot start pattern starts, then make high lateral pressure governor valve control main steam pressure with default four-speed Rate pressure release is to default second pressure value, it is preferable that the fourth rate can be 0.2MPa/min, and this Two pressure can be 14MPa；When boiler needs maintenance, then pressure release is to 0Mpa.

Preferably, this method also includes：When the intermediate pressure by-pass corresponding with turbine high-pressure air cylinder group reaches During default Rule of judgment, intermediate pressure by-pass opens machine mode operation with intermediate pressure by-pass, as shown in Figure 3.

Wherein, intermediate pressure by-pass opens machine pattern and comprised the following steps：The initial of machine pattern is opened into intermediate pressure by-pass At the moment, middle lateral pressure regulating valve is remained turned-off, opened until high lateral pressure regulating valve and arrive the default 3rd During high other aperture, the pressure value of single reheat steam pressure is changed into default second desired value, it is preferable that 3rd high other aperture can be 3%, and second desired value can be 0.55MPa；Specifically, by middle side Pressure-regulating valve is gradually opened into 100% with default 5th speed by 0, central lateral pressure regulating valve During aperture reaches default first during other aperture, other aperture in first is defined to aperture lower limit, it is preferable that This in first other aperture can be 10%, and by single reheat vapour pressure force value with default 6th speed liter To the second desired value, it is preferable that the 6th speed can be 0.05MPa/min；Central lateral pressure regulation The aperture of valve other aperture and single reheat steam pressure is less than default second red switch in reaching default second During pressure, single reheat vapour pressure force value is risen to the pressure of the second red switch pressure with default 7th speed Value, it is preferable that this in second other aperture can be 50%, the second red switch pressure can be 2.5MPa, 7th speed can be 0.3MPa/min；After beginning red switch is grid-connected, by middle lateral pressure regulating valve with pre- If the 8th speed turn down until fully closed entrance overflow operational mode, single reheat vapour pressure force value is maintained In default 3rd pressure value, it is preferable that the 3rd pressure value can be 3.5MPa, when single reheat is steamed When vapour pressure force value exceedes the default 3rd pressure value 3.5MPa, open middle lateral pressure regulating valve.

Preferably, this method also includes：When intermediate pressure by-pass is not up to default Rule of judgment, by middle pressure Road is run with intermediate pressure by-pass shutdown mode, as shown in Figure 3.

In the case where shutting down not blowing out operating mode, by middle lateral pressure governor valve control single reheat steam pressure, make Single reheat vapour pressure force value remains the pressure value of the second red switch pressure, here the second red switch pressure The pressure value of power can be default 2.5MPa.

In the case where shutting down blowing out operating mode, lateral pressure regulating valve is closed with pressurize in holding；If opened with very hot state Dynamic model formula starts, by middle lateral pressure governor valve control main steam pressure, with default 9th speed pressure release To the second red switch pressure, it is preferable that the 9th speed can be 0.1MPa/min, the second red switch pressure Can be 2.5MPa；When boiler needs maintenance, then pressure release is to 0MPa.

Preferably, this method also includes：When the low voltage bypass corresponding with air cylinder group in steam turbine reaches During default Rule of judgment, low voltage bypass opens machine mode operation with low voltage bypass, as shown in Figure 4.

Wherein, low voltage bypass opens machine pattern and comprised the following steps：The initial of machine pattern is opened into low voltage bypass At the moment, low lateral pressure regulating valve is remained turned-off, opened until high lateral pressure regulating valve and arrive the default 3rd High other aperture, and middle lateral pressure regulating valve is when opening the other aperture in the default 3rd, it is preferable that should 3rd high other aperture can be that other aperture can be 5% in 3%, the 3rd, by low lateral pressure regulating valve Gradually be opened into 100% by 0 with default tenth speed, when the aperture of low lateral pressure regulating valve reach it is pre- If the first low other aperture when, the first low other aperture is defined to aperture lower limit, it is preferable that this is first low Other aperture can be 10%, and double reheat vapour pressure force value be risen to default 11st speed default The 4th pressure value, it is preferable that the 11st speed can be 0.05MPa/min, the 4th pressure value Can be 0.1MPa；When the aperture of low lateral pressure regulating valve reach the default second low other aperture and it is secondary again When vapours pressure is less than default five pressure value, by double reheat vapour pressure force value with the default tenth Two speed rise to default 3rd red switch pressure, it is preferable that the second low other aperture can be 50%, should 5th pressure value can be 1.0MPa, and the 12nd speed can be 0.01MPa/min, the 3rd red switch Pressure can be 1.0MPa；After beginning red switch is grid-connected, by low lateral pressure regulating valve with the default 13rd Speed is turned down until fully closed entrance overflow operational mode, double reheat vapour pressure force value is maintained default 6th pressure value, it is preferable that the 6th pressure value can be 1.5MPa.When double reheat vapour pressure force value During more than default six pressure value, low lateral pressure regulating valve is opened, into overflow operational mode.

Preferably, this method also includes：When low voltage bypass is not up to default Rule of judgment, by low pressure Road is run with low voltage bypass shutdown mode, as shown in Figure 4.

Wherein, low voltage bypass shutdown mode comprises the following steps：

In the case where shutting down not blowing out operating mode, by low lateral pressure governor valve control double reheat steam pressure, make Double reheat vapour pressure force value remains the pressure value of the 3rd red switch pressure, it is preferable that the 3rd red switch pressure Power can be 1.0MPa.

In the case where shutting down blowing out operating mode, low lateral pressure regulating valve is set to close with pressurize；If with very hot startup Pattern starts, by low lateral pressure governor valve control double reheat steam pressure, with default tenth four-speed Rate pressure release is to the 3rd red switch pressure, it is preferable that the 14th speed can be 0.1MPa/min, the 3rd Red switch pressure can be 1.0MPa；When boiler needs maintenance, then pressure release is to 0MPa.

High pressure turbine by described above open machine pattern, high pressure turbine by shutdown mode, intermediate pressure by-pass open machine pattern, Intermediate pressure by-pass shutdown mode, low voltage bypass open machine pattern, low voltage bypass shutdown mode and have collectively constituted one Double reheat power generation sets three-level bypasses automatic control system.

Based on above-mentioned control strategy, present invention adds extra control loop, aid in above-mentioned 6 Control model preferably completes automatically controlling for double reheat power generation sets three-level bypass, the extra control loop Except judging that loop, in addition to boiler thermal-state are rinsed control loop, cut including above-mentioned state start-up mode Gain road, lower bound setting loop and pressure definite value and loop is set, below will be to these loops in the present invention Control operation method be described in detail.

The present invention is opened by height adds a boiler thermal-state flushing control loop in machine pattern, in unit heating Hot pre-washing function can be realized during boosting rectifier control automatically, automatically by main steam pressure control default In value, such as 0.9MPa.If main vapour pressure at that time exceedes the preset value, big high lateral pressure regulating valve is opened Aperture, aperture that is on the contrary then reducing high lateral pressure regulating valve realizes level pressure needs during hot flushing.

Specifically, the control method includes：Open in machine pattern, rushed by default boiler thermal-state by height The temperature and pressure of control loop detection boiler main steam are washed, when detecting main steam increasing temperature and pressure to default The first temperature and default seven pressure value when, it is preferable that first temperature can be 190 DEG C, should 7th pressure value can be 0.9MPa, and high lateral pressure regulating valve is switched into default constant DP control mode, tie up Hold the 7th pressure value constant；And preset value will be reduced to coal rate, it is preferable that the preset value can be 5t/h, And steam-water separator water level is reduced, feedwater discharge capacity is increased, until the water quality of boiler reclaimed water meets default Standard value.

The boiler thermal-state rinse control loop comprising RS holding registers, high limit monitor, OR gate, with Door, KB buttons, impulse generator.With reference to above-mentioned control strategy, separated during increasing temperature and pressure Device inlet temperature, which is gradually increasing, reaches 190 DEG C and when main vapour pressure reaches 0.9MPa, RS holding registers It is 1 to put hot flushes instructions position, and high lateral pressure regulating valve now switchs to constant DP control mode, main steam pressure Force value is 0.9MPa, at the same also to perform reduction give coal rate, by reduce steam-water separator water level increase to Water discharge capacity, realizes the function of the hot flushing of big flow.The qualified rear operations staff of water quality can also move back manually Go out hot flushing.

The present invention adds a switching circuit in three-level bypass control loop, and switching circuit, which can be realized, to stop Machine quickly is opened in the case of machine not blowing out, bypass need not be now cut to control manually, and just automatic realization is shut down Pattern improves the automaticity of Bypass Control to the conversion for opening machine pattern.Switching circuit includes subtraction Device, high lower bound monitor, NOT gate and door.High pressure turbine by, intermediate pressure by-pass, low voltage bypass have respectively respectively Self-corresponding high other switching circuit, middle other switching circuit, low other switching circuit.

Specifically, the control method of switching circuit includes：

Under the operating mode that steam turbine trips or generator tripping but boiler do not stop, and main steam pressure force value quilt When controlling in the range of default high other target pressure value, then trigger default high other switching circuit and produce One control instruction, is sent to default high lateral pressure control loop, when default high lateral pressure is controlled back Road is received after the control instruction, makes high pressure turbine by reenter high pressure turbine by by high pressure turbine by shutdown mode Open the increasing temperature and pressure stage in machine pattern, it is preferable that the other target pressure value scope of above-mentioned height can be set For 0MPa~1MPa.

Do not stop under the operating mode of (no MFT) in steam turbine tripping operation or generator tripping but boiler, single reheat When steam pressure is controlled to (0MPa~1MPa) in the range of middle other target pressure value, in escribe and gain Road sends control instruction, intermediate pressure by-pass is switched to intermediate pressure by-pass again by intermediate pressure by-pass shutdown mode and opens machine mould The increasing temperature and pressure stage of formula.

Do not stop under the operating mode of (no MFT) in steam turbine tripping operation or generator tripping but boiler, double reheat When steam pressure is controlled to (0MPa~1MPa) in the range of low other target pressure value, low other switching circuit Control instruction is sent, low voltage bypass is switched to low voltage bypass again by low voltage bypass shutdown mode and opens machine pattern The increasing temperature and pressure stage.

The present invention adds a lower bound setting loop in three-level bypass control loop, and specifically, lower bound is set Determining the control method in loop includes：

Shut down not blowing out operating mode under, by default lower bound set loop, to high pressure turbine by regulating valve, The regulation aperture of intermediate pressure by-pass regulating valve and low voltage bypass regulating valve carries out lower bound setting；Wherein, high pressure The lower bound setting of bypass valve is determined that intermediate pressure by-pass is adjusted by the respective function of default main steam temperature The lower bound setting of valve and low voltage bypass regulating valve is default fixed aperture, e.g., 5%.

In embodiments of the present invention, this loop can be in boiler heating boosting and steam-turbine unit removal of load The lower bound of generation control instruction, increasing temperature and pressure lower bound, e.g., and 10%, removal of load lower bound, e.g., and 5%, have Reheater protection is lost (medium/low to press bypass valve fully closed and the medium/low pressure of steam turbine when effect avoids removal of load Main inlet throttle-stop valve is fully closed) caused by blowing out accident, make boiler transition transient running stable, improve start it is special Property reduce unit life consumption.Lower bound setting loop includes T switch, high lower bound setting apparatus.One (two It is secondary) secondary reheating vapour increasing temperature and pressure (low) other control valve opening in>When 10%, its lower bound 10% is set； When steam-turbine unit removal of load by T switch, (low) other control valve opening lower bound 5% in setting.

The present invention adds a pressure definite value in three-level bypass control loop and sets loop, by default Pressure definite value set loop, to high pressure turbine by, intermediate pressure by-pass and low voltage bypass different phase steam Pressure value is pre-seted, and the elevation rate of the pressure value is pre-seted.

The pressure definite value sets loop to realize bypass and set in the main steam pressure of different phase, especially machine Stewing stove function of the group after main fuel trip, provides pressure setting for very hot startup, is conducive to shortening to open The dynamic time.Pressure definite value sets loop to include T switch, adder, function generator, definite value setting Device, speed limiting device.The loop realizes bypass by T switch and set in each staged pressure automatically The automatic setting of value, sets automatically while through-rate limiter is realized to the elevation rate of pressure set points Put, the no-harass switch that bypass is manual and automatically controls also is realized by T switch.

In order to achieve the above object, the invention also provides a kind of double reheat fired power generating unit Bypass Control system System 01, as shown in figure 5, the system includes：High other control module 02.

High other control module 02 is used for：When the high pressure turbine by corresponding with steam turbine super-pressure air cylinder group reaches During default Rule of judgment, control high pressure turbine by opens machine mode operation with high pressure turbine by.

Wherein, high pressure turbine by opens machine pattern and comprised the following steps：Judge boiler export initial pressure whether High lateral pressure is adjusted more than the very hot startup pressure of default steam-turbine unit, and according to judged result Valve is opened to the default first high other aperture, and maintains the first high other aperture until main steam pressure force value reaches Default first desired value；Maintain the first desired value constant, make high lateral pressure regulating valve with the combustion of boiler Burning is continued on；When the aperture of high lateral pressure regulating valve reaches the default second high other aperture, the is maintained Two high other apertures are constant；Main steam pressure force value is made to boost to the first red switch pressure with default first rate；When After beginning red switch is grid-connected, high lateral pressure regulating valve is made to be turned down with default second speed until fully closed；Work as height After lateral pressure regulating valve is fully closed, into overflow operational mode, main steam pressure force value random groups sliding pressure curve is made Change, and one fixed value of superposition is set as the anti-Opening pressure of high lateral pressure regulating valve on sliding pressure curve Definite value, when actual main steam pressure fails to maintain high lateral pressure regulating valve to keep full off state, high other pressure Force regulating valve is opened.

Preferably, default Rule of judgment includes：Any oil reservoir for detecting boiler is fought and the state It is able to maintain that default time span, or detects any mill layer operation of boiler and the state can Maintain default very first time length.

Preferably, the system also judges loop 05 including state start-up mode.

State start-up mode judges that loop 05 is used for：Judge that steam-turbine unit is opened under machine pattern in high pressure turbine by When in cold start pattern, warm starting pattern, hot starting, hot start pattern and very hot startup pattern Any start-up mode.

State start-up mode judges that loop 05 includes to the determination methods of start-up mode：In default four groups of shapes State start-up mode judges to input the temperature of rotor of super-pressure cylinder in loop respectively, according to default different Temperature of rotor scope determines the start-up mode of steam-turbine unit, and resets start-up mode after grid-connected； Wherein, default different temperature of rotor scope respectively with cold start pattern, warm starting pattern, heat State start-up mode and very hot startup pattern are corresponded.

Preferably,

When the start-up mode of steam-turbine unit is cold start pattern, the first desired value is default first Pressure value；When the start-up mode of steam-turbine unit is the warm starting pattern and hot starting, hot start pattern, First desired value is the boiler pressure value before ignition of the boiler；When the start-up mode of steam-turbine unit is very hot state During start-up mode, the first desired value is red switch pressure value.

Preferably, high other control module 02 judges whether the initial pressure of boiler export is more than default steamer The very hot startup pressure of machine unit, and opened high lateral pressure regulating valve to default according to judged result First high other aperture refers to：

Preferably, high other control module 02 is additionally operable to：When high pressure turbine by is not up to default Rule of judgment, High pressure turbine by is controlled to be run with high pressure turbine by shutdown mode.

Preferably, the system also includes middle other control module 03；Middle other control module 03 is used for：When with When the corresponding intermediate pressure by-pass of turbine high-pressure air cylinder group reaches default Rule of judgment, intermediate pressure by-pass is controlled Machine mode operation is opened with intermediate pressure by-pass.

Wherein, intermediate pressure by-pass opens machine pattern and comprised the following steps：The initial of machine pattern is opened into intermediate pressure by-pass At the moment, middle lateral pressure regulating valve is remained turned-off, opened until high lateral pressure regulating valve and arrive the default 3rd During high other aperture, middle lateral pressure regulating valve is gradually opened into 100% with default 5th speed by 0, During the aperture of central lateral pressure regulating valve reaches default first during other aperture, other aperture in first is limited For aperture lower limit, and single reheat vapour pressure force value is risen into the second desired value with default 6th speed； The aperture of central lateral pressure regulating valve other aperture and single reheat steam pressure is less than in reaching default second During default second red switch pressure, single reheat vapour pressure force value is risen to second with default 7th speed The pressure value of red switch pressure；After beginning red switch is grid-connected, by middle lateral pressure regulating valve with the default 8th speed Rate is turned down up to fully closed, single reheat vapour pressure force value is maintained into default 3rd pressure value, when once When reheated steam pressure value exceedes default three pressure value, open middle lateral pressure regulating valve.

Preferably, middle other control module 03 is additionally operable to：When intermediate pressure by-pass is not up to default Rule of judgment When, control intermediate pressure by-pass is run with intermediate pressure by-pass shutdown mode.

Preferably, the system also includes low other control module 04.

Low other control module 04 is used for：When the low voltage bypass corresponding with air cylinder group in steam turbine reach it is pre- If Rule of judgment when, control low voltage bypass machine mode operation is opened with low voltage bypass.

Wherein, low voltage bypass opens machine pattern and comprised the following steps：The initial of machine pattern is opened into low voltage bypass At the moment, low lateral pressure regulating valve is remained turned-off, opened until high lateral pressure regulating valve and arrive the default 3rd High other aperture, and middle lateral pressure regulating valve is when opening the other aperture in the default 3rd, by low lateral pressure Regulating valve is gradually opened into 100% with default tenth speed by 0, when the aperture of low lateral pressure regulating valve When reaching the default first low other aperture, the first low other aperture is limited it as aperture lower limit, and will be secondary Reheated steam pressure value rises to default 4th pressure value with default 11st speed；When low lateral pressure is adjusted The aperture of section valve reaches the default second low other aperture and double reheat steam pressure is less than the default 5th During pressure value, double reheat vapour pressure force value is risen into default 3rd red switch with default 12nd speed Pressure；When start red switch it is grid-connected after, low lateral pressure regulating valve is turned down with default 13rd speed until It is fully closed, double reheat vapour pressure force value is maintained into default 6th pressure value, when double reheat vapour pressure When force value exceedes default six pressure value, low lateral pressure regulating valve is set to open overflow operational mode.

Preferably,

Low other control module 04 is additionally operable to：When low voltage bypass is not up to default Rule of judgment, control low Pressure bypass is run with low voltage bypass shutdown mode.

Wherein, low voltage bypass shutdown mode comprises the following steps：

Preferably, the system also includes：Boiler thermal-state rinses control loop 06.

Boiler thermal-state, which rinses control loop 06, to be used for：Opened by height in machine pattern, detection boiler main steam Temperature and pressure, when detecting main steam increasing temperature and pressure to default first temperature and default 7th pressure During value wMPa, high lateral pressure regulating valve is switched into constant DP control mode, maintains the 7th pressure value constant； And preset value will be reduced to coal rate, and steam-water separator water level is reduced, feedwater discharge capacity is increased, until The water quality of boiler reclaimed water meets default standard value.

Preferably, the system also includes high other switching circuit 07.

High other switching circuit 07 is used for：Shut down not blowing out operating mode under, when boiler do not stop and steam turbine or During generator failure, if main steam pressure force value reaches default 8th pressure value, produce a switching and refer to Order, is sent to control module by height, after control module receives switching command by height, makes high pressure turbine by High pressure turbine by is reentered by high pressure turbine by shutdown mode and opens boost phase in machine pattern.

High other switching circuit 07 is additionally operable to：In the operating mode that steam turbine trips or generator tripping but boiler do not stop Under, and main steam pressure force value is when being controlled in the range of default high other target pressure value, produces one Control instruction, is sent to control module by height, after control module receives control instruction by height, and order is high Pressure bypass reenters high pressure turbine by by high pressure turbine by shutdown mode and opens increasing temperature and pressure stage in machine pattern.

Preferably, the system also includes lower bound setting loop 08.

Lower bound setting loop 08 is used for：In the case where shutting down not blowing out operating mode, to high pressure turbine by regulating valve, middle pressure The regulation aperture of bypass valve and low voltage bypass regulating valve carries out lower bound setting；Wherein, high pressure turbine by Regulating valve lower bound setting is determined by the respective function of default main steam temperature, intermediate pressure by-pass regulating valve with The lower bound setting of low voltage bypass regulating valve is default fixed aperture.

Preferably, the system also includes pressure definite value setting loop 09.

Pressure definite value sets loop 09 to be used for：By default pressure definite value set loop, to high pressure turbine by, Intermediate pressure by-pass and low voltage bypass are pre-seted in the vapour pressure force value of different phase, and to pressure value Elevation rate is pre-seted.

The present invention is due to taking above technical scheme, and it has advantages below：

1st, three-level Bypass Control System is divided into by the present invention by unit technological process opens machine pattern and shutdown mould Formula, control targe is relatively independent, and control method is easily realized, sets four intelligence to return according to service requirement Road completes to open machine pattern, shutdown mode inside and mutual switching, realizes the automatic control of full-range bypass System.For being controlled by height, machine pattern is opened after ignition of the boiler, it is unit starting rank to open the 1st section of machine pattern Section；High side valve is fully closed and set grid-connection after startup stage switch to open the 2nd section of steam turbine pressure regulation rank of machine pattern automatically Section, high side now remains turned-off the defencive function with overflow after superpressure；After steam turbine or generator failure, When steam can not fully enter steam turbine, into shutdown mode, say shutdown mode from full-range angle 3 stages started meter, and the 3rd stage was steam turbine or generator failure stage, this stage high other main vapour pressure of regulation Power；Enter the 4th stage unit MFT after main fuel trip, bypass as fully closed stewing oven-like state；When need inspection When repairing, operations staff can be manually selected into the 5th stage, and now bypass is pressure release state, basic to contain The all processes covered in technological process.

2nd, the present invention opens one unit starting mode decision loop of addition in machine pattern by height, and this loop can With according to ultra-high pressure cylinder temperature of rotor judge unit residing for starting state (cold start, warm starting, Hot starting, hot start, very hot startup), the control targe value of high lateral pressure is provided according to each starting state, entirely Face succinctly realize the setting in control strategy to main vapour pressure.

3rd, the present invention is opened by height adds a boiler thermal-state flushing control loop in machine pattern, in unit liter Hot pre-washing function can be realized during warm boosting rectifier control automatically, main Steam Pressure Control of Circulated exists automatically 0.9MPa.Open big high lateral pressure regulating valve if main vapour pressure at that time is more than 0.9MPa, it is on the contrary then subtract Small high lateral pressure regulating valve, realizes level pressure needs during hot flushing.

4th, the present invention adds a switching circuit in bypass control loop, and switching circuit can realize shutdown Machine quickly is opened in the case of not blowing out, bypass need not be now cut to control manually, and just mould is shut down in automatic realization Formula improves the automaticity of Bypass Control to the conversion for opening machine pattern.

5th, the present invention increases a lower bound loop in bypass control loop, and this loop is boosted in boiler heating And the instruction of aperture lower bound is produced during load rejection, it effectively prevent increasing temperature and pressure stage reheater through-current capacity Blowing out accident caused by reheater protection action, makes boiler transition transient running during too small and removal of load It is stable, improve the life consumption that starting characteristic reduces unit.

6th, the present invention increases a pressure definite value setting loop in bypass control loop, it is possible to achieve bypass Set in the main vapour pressure of different phase, the stewing stove function especially after main fuel trip, is very hot state Start and pressure setting is provided, be conducive to shortening the startup time.In summary, the present invention not only makes by three-level Road realize it is full-range automatically control, and consider the situation under unit each start-up mode comprehensively, While expansion dangerous in the case of avoiding steam turbine failure, makes boiler transition transient running stable, reaches Start and on-load characteristic to improving, reduce the life consumption of unit, improve the security and economy of operation Property.Can be when steam turbine breaks down using the method for operation for shutting down not blowing out；Or adopted in electric network fault Unit house load operation is used, is conducive to restoring electricity as early as possible, accident scope is reduced.High other control and regulation Valve has opens function soon, can shorten the startup time on the premise of steam turbine life-span is ensured, again can be in vapour Replace the effect of boiler safety door during machine rapid-transport line.One is provided for three-level bypass whole-process automatic control Individual example.

Although disclosed herein embodiment as above, described content is only to readily appreciate the present invention And the embodiment used, it is not limited to the present invention.Technology people in any art of the present invention Member, do not depart from disclosed herein spirit and scope on the premise of, can be in the form of implementation and thin Any modification and change, but the scope of patent protection of the present invention are carried out on section, still must be with appended right The scope that claim is defined is defined.

Claims

1. a kind of double reheat fired power generating unit bypass control method, it is characterised in that methods described includes：

When the high pressure turbine by corresponding with steam turbine super-pressure air cylinder group reaches default Rule of judgment, institute State high pressure turbine by and machine mode operation is opened with high pressure turbine by；

Wherein, the high pressure turbine by opens machine pattern and comprised the following steps：Judge the initial pressure of boiler export Whether the very hot startup pressure of default steam-turbine unit is more than, and according to judged result by high lateral pressure Regulating valve is opened to the default first high other aperture, and maintains the described first high other aperture until main steam pressure Force value reaches default first desired value；Maintain first desired value constant, adjust the high lateral pressure Section valve is continued on the burning of boiler；When the aperture of high lateral pressure regulating valve reaches that default second is high During other aperture, maintain the described second high other aperture constant；The main steam pressure force value will be with default first speed Rate boosts to the first red switch pressure；After beginning red switch is grid-connected, the high lateral pressure regulating valve is with default Second speed is turned down until fully closed；Enter overflow operational mode after the high lateral pressure regulating valve is fully closed, The main steam pressure force value is by random groups sliding pressure curvilinear motion, and one fixed value of superposition on sliding pressure curve As the anti-Opening pressure setting value of high lateral pressure regulating valve, when actual main steam pressure fails to remain described When high lateral pressure regulating valve keeps full off state, the high lateral pressure regulating valve is opened.

2. double reheat fired power generating unit bypass control method as claimed in claim 1, it is characterised in that The default Rule of judgment includes following any one or more：Detecting any oil reservoir of boiler has fire And the state is able to maintain that default time span, and detect boiler the operation of any mill layer and The state is able to maintain that default very first time length.

3. double reheat fired power generating unit bypass control method as claimed in claim 1, it is characterised in that Methods described also includes：Judge that loop judges the steam turbine machine by default four groups of state start-up modes Group when the high pressure turbine by is opened under machine pattern in cold start pattern, warm starting pattern, hot open Any start-up mode in dynamic model formula and the very hot startup pattern；

The determination methods of the start-up mode include：Judge back in default four groups of state start-up modes The temperature of rotor of super-pressure cylinder is inputted in road respectively, is determined according to default different temperature of rotor scope The start-up mode of steam-turbine unit, and reset the start-up mode after grid-connected；Wherein, it is described Default different temperature of rotor scope respectively with the cold start pattern, warm starting pattern, hot Start-up mode and very hot startup pattern are corresponded.

4. double reheat fired power generating unit bypass control method as claimed in claim 3, it is characterised in that Methods described also includes：

When the start-up mode of steam-turbine unit is the cold start pattern, warm starting pattern and hot opened During dynamic model formula, the default first high other aperture is a%；When the start-up mode of steam-turbine unit is institute When stating very hot startup pattern, the default first high other aperture is b%；Wherein, a and b are small In or equal to 100 positive integer, b be less than or equal to a；

When the start-up mode of steam-turbine unit is the cold start pattern, first desired value is pre- If first pressure value；When the start-up mode of steam-turbine unit is the warm starting pattern and described hot During start-up mode, first desired value is the boiler pressure value before ignition of the boiler；When steam-turbine unit When start-up mode is the very hot startup pattern, first desired value is the first red switch pressure value.

5. double reheat fired power generating unit bypass control method as claimed in claim 1, it is characterised in that Whether the initial pressure for judging boiler export is more than the very hot startup pressure of default steam-turbine unit Power, and referred to the unlatching of high lateral pressure regulating valve to the default first high other aperture according to judged result：

When the initial pressure of the boiler export is more than unit very hot startup pressure, high lateral pressure is adjusted Save valve to open to the default first high other aperture with default third speed, maintain fixed steam through-current capacity； It is described entering when the initial pressure of the boiler export is less than or equal to unit very hot startup pressure High pressure turbine by opens machine pattern initial time, remains turned-off the high lateral pressure regulating valve, until boiler is opened Beginning opens pressure, and the high lateral pressure regulating valve is opened with the default fourth rate and arrives described default the One high other aperture, maintains fixed steam through-current capacity.

6. double reheat fired power generating unit bypass control method as claimed in claim 1, it is characterised in that Methods described also includes：When the high pressure turbine by is not up to the default Rule of judgment, the high pressure Bypass is run with high pressure turbine by shutdown mode；

Wherein, the high pressure turbine by shutdown mode comprises the following steps：

In the case where shutting down not blowing out operating mode, open the high lateral pressure regulating valve and kept for default second time Length, after default second time span, makes the high lateral pressure regulating valve according to default Control function controls the main steam pressure；Wherein, the high lateral pressure regulating valve keeps default second Aperture during time span is the function of the steam flow amount of main steam, and the main steam pressure setting value is fuel The function of amount；

In the case where shutting down blowing out operating mode, the high lateral pressure regulating valve is kept to close with pressurize, when with very hot state When start-up mode starts, then make main steam pressure described in the high lateral pressure governor valve control with default the Four speed pressure releases are to default second pressure value；When the boiler needs maintenance, then pressure release is to 0Mpa.

7. double reheat fired power generating unit bypass control method as claimed in claim 1, it is characterised in that Methods described also includes：When the intermediate pressure by-pass corresponding with turbine high-pressure air cylinder group reach it is described default During Rule of judgment, medium pressure bypass opens machine mode operation with intermediate pressure by-pass；

Wherein, medium pressure bypass is opened machine pattern and comprised the following steps：Qi Jimo is bypassed into medium pressure The initial time of formula, remains turned-off middle lateral pressure regulating valve, until the high lateral pressure regulating valve is opened During to the default 3rd high other aperture, by the middle lateral pressure regulating valve with default 5th speed by 0% 100% is gradually opened into, the other aperture in the aperture of the middle lateral pressure regulating valve reaches default first When, other aperture in described first is defined to aperture lower limit, and by the single reheat vapour pressure force value with Default 6th speed rises to second desired value；When the aperture of the middle lateral pressure regulating valve reach it is pre- If second in other aperture and the single reheat steam pressure when being less than default second red switch pressure, will The single reheat vapour pressure force value rises to the pressure of the second red switch pressure with default 7th speed Value；When start red switch it is grid-connected after, the middle lateral pressure regulating valve is turned down with default 8th speed until Fully closed entrance overflow operational mode, default 3rd pressure is maintained by the single reheat vapour pressure force value Value, when the single reheat vapour pressure force value exceedes default three pressure value, makes the middle side Pressure-regulating valve is opened.

8. double reheat fired power generating unit bypass control method as claimed in claim 7, it is characterised in that

Methods described also includes：It is described when medium pressure bypass is not up to the default Rule of judgment Intermediate pressure by-pass is run with intermediate pressure by-pass shutdown mode；

Wherein, medium pressure bypass shutdown mode comprises the following steps：

In the case where shutting down not blowing out operating mode, by single reheat steam pressure described in middle lateral pressure governor valve control, The single reheat vapour pressure force value is set to remain the pressure value of the second red switch pressure；

In the case where shutting down blowing out operating mode, the middle lateral pressure regulating valve is kept to close with pressurize；If with very hot State start-up mode starts, by main steam pressure described in the middle lateral pressure governor valve control, with default 9th speed pressure release is to the second red switch pressure；When the boiler needs maintenance, then pressure release is extremely 0MPa。

9. double reheat fired power generating unit bypass control method as claimed in claim 7, it is characterised in that

Methods described also includes：When the low voltage bypass corresponding with air cylinder group in steam turbine reach it is described pre- If Rule of judgment when, the low voltage bypass opens machine mode operation with low voltage bypass；

Wherein, the low voltage bypass opens machine pattern and comprised the following steps：Machine mould is opened into the low voltage bypass The initial time of formula, remains turned-off low lateral pressure regulating valve, until the high lateral pressure regulating valve is opened To the default 3rd high other aperture, and the middle lateral pressure regulating valve is opened in the default 3rd During other aperture, the low lateral pressure regulating valve is gradually opened into default tenth speed by 0% 100%, when the aperture of the low lateral pressure regulating valve reaches the default first low other aperture, by described the One low other aperture limits it as aperture lower limit, and by double reheat vapour pressure force value with the default 11st speed Rate rises to default 4th pressure value；When the aperture of the low lateral pressure regulating valve reaches that default second is low When other aperture and the double reheat steam pressure are less than default five pressure value, by the double reheat Vapour pressure force value rises to default 3rd red switch pressure with default 12nd speed；When starting, red switch is grid-connected Afterwards, the low lateral pressure regulating valve is turned down with default 13rd speed until fully closed entrance overflow is run Pattern, default 6th pressure value is maintained by the double reheat vapour pressure force value, when it is described it is secondary again When vapours pressure value exceedes default six pressure value, open the low lateral pressure regulating valve.

10. double reheat fired power generating unit bypass control method as claimed in claim 9, it is characterised in that

Methods described also includes：It is described when the low voltage bypass is not up to the default Rule of judgment Low voltage bypass is run with low voltage bypass shutdown mode；

Wherein, the low voltage bypass shutdown mode comprises the following steps：

In the case where shutting down not blowing out operating mode, by double reheat steam pressure described in low lateral pressure governor valve control, The double reheat vapour pressure force value is set to remain the pressure value of the 3rd red switch pressure；

In the case where shutting down blowing out operating mode, the low lateral pressure regulating valve is set to close with pressurize；If with very hot state Start-up mode starts, by double reheat steam pressure described in the low lateral pressure governor valve control, with pre- If the 14th speed pressure release to the 3rd red switch pressure；When the boiler needs maintenance, then pressure release To 0MPa.

11. double reheat fired power generating unit bypass control method as claimed in claim 1, it is characterised in that Methods described also includes：

Opened by the height in machine pattern, control loop is rinsed by default boiler thermal-state and detects boiler main The temperature and pressure of steam, when detecting the main steam increasing temperature and pressure to default first temperature and default Seven pressure values when, the high lateral pressure regulating valve is switched into constant DP control mode, the described 7th is maintained Pressure value is constant；And preset value will be reduced to coal rate, and steam-water separator water level is reduced, increase feedwater Discharge capacity, until the water quality of boiler reclaimed water meets default standard value.

12. double reheat fired power generating unit bypass control method as claimed in claim 1, it is characterised in that Methods described also includes：

Under the shutdown not blowing out operating mode, when boiler do not stop and when steam turbine or generator failure, such as Really described main steam pressure force value reaches default 8th pressure value, then triggers default high other switching circuit simultaneously A switching command is produced, default high lateral pressure control loop is sent to, when the default high other pressure Power control loop is received after the switching command, makes the high pressure turbine by shut down mould by the high pressure turbine by Formula reenters the high pressure turbine by and opens boost phase in machine pattern；

Under the operating mode that steam turbine trips or generator tripping but boiler do not stop, and the main steam pressure When value is controlled in the range of default high other target pressure value, then the default height is triggered and escribes gaining Road simultaneously produces a control instruction, the default high lateral pressure control loop is sent to, when described default High lateral pressure control loop receive after the control instruction, make the high pressure turbine by by the high pressure Road shutdown mode reenters the high pressure turbine by and opens increasing temperature and pressure stage in machine pattern.

13. double reheat fired power generating unit bypass control method as claimed in claim 1, it is characterised in that Methods described also includes：

Under the shutdown not blowing out operating mode, loop is set by default lower bound, to the high pressure turbine by The regulation aperture of regulating valve, intermediate pressure by-pass regulating valve and low voltage bypass regulating valve carries out lower bound setting；Its In, the lower bound setting of the high pressure turbine by regulating valve is determined by the respective function of default main steam temperature, The lower bound setting of medium pressure bypass valve and low voltage bypass regulating valve is default fixed aperture.

14. double reheat fired power generating unit bypass control method as claimed in claim 1, it is characterised in that Methods described also includes：

15. a kind of double reheat fired power generating unit Bypass Control System, it is characterised in that the system includes： High other control module；

The high other control module is used for：When the high pressure turbine by corresponding with steam turbine super-pressure air cylinder group reaches During to default Rule of judgment, the high pressure turbine by is controlled to open machine mode operation with high pressure turbine by；

Wherein, the high pressure turbine by opens machine pattern and comprised the following steps：Judge the initial pressure of boiler export Whether the very hot startup pressure of default steam-turbine unit is more than, and according to judged result by high lateral pressure Regulating valve is opened to the default first high other aperture, and maintains the described first high other aperture until main steam pressure Force value reaches default first desired value；Maintain first desired value constant, adjust the high lateral pressure Section valve is continued on the burning of boiler；When the aperture of high lateral pressure regulating valve reaches that default second is high During other aperture, maintain the described second high other aperture constant；The main steam pressure force value is made with default first speed Rate boosts to the first red switch pressure；After beginning red switch is grid-connected, the high lateral pressure regulating valve is made with default The second speed turn down until fully closed；After the high lateral pressure regulating valve is fully closed, mould is run into overflow Formula, makes the main steam pressure force value random groups sliding pressure curvilinear motion, and is superimposed one admittedly on sliding pressure curve Definite value as high lateral pressure regulating valve anti-Opening pressure setting value, when the actual main steam pressure fails When maintaining the high lateral pressure regulating valve holding full off state, the high lateral pressure regulating valve is opened.

16. double reheat fired power generating unit Bypass Control System as claimed in claim 15, it is characterised in that The default Rule of judgment includes following any one or more：Detecting any oil reservoir of boiler has fire And the state is able to maintain that default time span, and detect boiler the operation of any mill layer and The state is able to maintain that default very first time length.

17. double reheat fired power generating unit Bypass Control System as claimed in claim 15, it is characterised in that The system also judges loop including state start-up mode；

The state start-up mode judges that loop is used for：Judge the steam-turbine unit in the high pressure turbine by In cold start pattern, warm starting pattern, hot starting, hot start pattern and described very hot when opening under machine pattern Any start-up mode in state start-up mode；

The state start-up mode judges that loop includes to the determination methods of the start-up mode：Described pre- If four groups of state start-up modes judge to input the temperature of rotor of super-pressure cylinder in loop respectively, according to pre- If different temperature of rotor scopes determine the start-up mode of steam-turbine unit, and by institute after grid-connected State start-up mode reset；Wherein, the default different temperature of rotor scope is opened with the cold conditions respectively Dynamic model formula, warm starting pattern, hot starting, hot start pattern and very hot startup pattern are corresponded.

18. double reheat fired power generating unit Bypass Control System as claimed in claim 17, it is characterised in that

When the start-up mode of steam-turbine unit is the cold start pattern, first desired value is pre- If first pressure value, wherein, x is arithmetic number；When the start-up mode of steam-turbine unit is the temperature state When start-up mode and the hot starting, hot start pattern, first desired value is the boiler pressure before ignition of the boiler Value；When the start-up mode of steam-turbine unit is the very hot startup pattern, first desired value is The first red switch pressure value.

19. double reheat fired power generating unit bypass control method as claimed in claim 15, it is characterised in that The high other control module judges whether the initial pressure of boiler export is more than the pole of default steam-turbine unit Hot starting, hot start pressure, and opened the unlatching of high lateral pressure regulating valve to the default first high side according to judged result Degree refers to：

20. double reheat fired power generating unit Bypass Control System as claimed in claim 15, it is characterised in that The high other control module is additionally operable to：When the high pressure turbine by is not up to the default Rule of judgment, The high pressure turbine by is controlled to be run with high pressure turbine by shutdown mode；

In the case where shutting down not blowing out operating mode, open the high lateral pressure regulating valve and kept for default second time Length, after default second time span, makes the high lateral pressure regulating valve according to default Control function controls the main steam pressure；Wherein, the high lateral pressure regulating valve keeps default second Aperture during time span is the function of the steam flow amount of main steam, and the main steam pressure force value is fuel quantity Function；

21. double reheat fired power generating unit Bypass Control System as claimed in claim 15, it is characterised in that The system also includes middle other control module；The middle other control module is used for：When with turbine high-pressure gas When the corresponding intermediate pressure by-pass of cylinder group reaches the default Rule of judgment, control medium pressure bypass is in Machine mode operation is opened in pressure bypass；

Wherein, medium pressure bypass is opened machine pattern and comprised the following steps：Qi Jimo is bypassed into medium pressure The initial time of formula, remains turned-off middle lateral pressure regulating valve, until the high lateral pressure regulating valve is opened During to the default 3rd high other aperture, by the middle lateral pressure regulating valve with default 5th speed by 0 by 100% is gradually opened into, when other aperture during the aperture of the middle lateral pressure regulating valve reaches default first, Other aperture in described first is defined to aperture lower limit, and by the single reheat vapour pressure force value with default The 6th speed rise to second desired value；When the aperture of the middle lateral pressure regulating valve reach it is default Other aperture and when the single reheat steam pressure is less than default second red switch pressure in second, will be described Single reheat vapour pressure force value rises to the pressure value of the second red switch pressure with default 7th speed；When Start red switch it is grid-connected after, the middle lateral pressure regulating valve is turned down until fully closed with default 8th speed, Into overflow operational mode, the single reheat vapour pressure force value is maintained into default 3rd pressure value, When the single reheat vapour pressure force value exceedes default three pressure value, make the middle lateral pressure Regulating valve is opened.

22. double reheat fired power generating unit Bypass Control System as claimed in claim 21, it is characterised in that

The middle other control module is additionally operable to：When medium pressure bypass is not up to the default Rule of judgment When, control medium pressure bypass is run with intermediate pressure by-pass shutdown mode；

Wherein, medium pressure bypass shutdown mode comprises the following steps：

23. double reheat fired power generating unit Bypass Control System as claimed in claim 21, it is characterised in that The system also includes low other control module；

The low other control module is used for：When the low voltage bypass corresponding with air cylinder group in steam turbine reaches During the default Rule of judgment, the low voltage bypass is controlled to open machine mode operation with low voltage bypass；

Wherein, the low voltage bypass opens machine pattern and comprised the following steps：Machine mould is opened into the low voltage bypass The initial time of formula, remains turned-off low lateral pressure regulating valve, until the high lateral pressure regulating valve is opened To the default 3rd high other aperture, and the middle lateral pressure regulating valve is opened in the default 3rd During other aperture, the low lateral pressure regulating valve is gradually opened into 100% with default tenth speed by 0, When the aperture of the low lateral pressure regulating valve reaches the default first low other aperture, by the described first low side Aperture limits it as aperture lower limit, and double reheat vapour pressure force value is risen to default 11st speed Default 4th pressure value；When the aperture of the low lateral pressure regulating valve reaches the default second low other aperture And the double reheat steam pressure be less than default five pressure value when, by the double reheat vapour pressure Force value rises to default 3rd red switch pressure with default 12nd speed；, will after beginning red switch is grid-connected The low lateral pressure regulating valve is turned down up to fully closed with default 13rd speed, into overflow operational mode, The double reheat vapour pressure force value is maintained into default 6th pressure value, when the double reheat steam When pressure value exceedes default six pressure value, open the low lateral pressure regulating valve.

24. double reheat fired power generating unit Bypass Control System as claimed in claim 23, it is characterised in that

The low other control module is additionally operable to：When the low voltage bypass is not up to the default Rule of judgment When, control the low voltage bypass to be run with low voltage bypass shutdown mode；

Wherein, the low voltage bypass shutdown mode comprises the following steps：

25. double reheat fired power generating unit Bypass Control System as claimed in claim 15, it is characterised in that The system also includes：Boiler thermal-state rinses control loop；

The boiler thermal-state, which rinses control loop, to be used for：Opened by the height in machine pattern, detect boiler main The temperature and pressure of steam, when detecting the main steam increasing temperature and pressure to default first temperature and default Seven pressure values when, the high lateral pressure regulating valve is switched into constant DP control mode, the described 7th is maintained Pressure value is constant；And preset value will be reduced to coal rate, and steam-water separator water level is reduced, increase feedwater Discharge capacity, until the water quality of boiler reclaimed water meets default standard value.

26. double reheat fired power generating unit bypass control method as claimed in claim 15, it is characterised in that The system also includes high other switching circuit；

The high other switching circuit is used for：Under the shutdown not blowing out operating mode, when boiler does not stop and vapour When turbine or generator failure, if the main steam pressure force value reaches default 8th pressure value, produce One switching command, is sent to the high other control module, when the high other control module receive it is described After switching command, the high pressure turbine by is made to be reentered by the high pressure turbine by shutdown mode by the high pressure Boost phase in Lu Qiji patterns；

The high other switching circuit is additionally operable to：In the work that steam turbine trips or generator tripping but boiler do not stop Under condition, and the main steam pressure force value is when being controlled in the range of default high other target pressure value, production A raw control instruction, is sent to the high other control module, when the high other control module receives institute State after control instruction, make the high pressure turbine by reenter the high pressure by the high pressure turbine by shutdown mode The increasing temperature and pressure stage in machine pattern is opened in bypass.

27. double reheat fired power generating unit Bypass Control System as claimed in claim 15, it is characterised in that The system also includes lower bound and sets loop；

The lower bound setting loop is used for：Under the shutdown not blowing out operating mode, the high pressure turbine by is adjusted The regulation aperture for saving valve, intermediate pressure by-pass regulating valve and low voltage bypass regulating valve carries out lower bound setting；Wherein, The lower bound setting of the high pressure turbine by regulating valve is determined by the respective function of default main steam temperature, described The lower bound setting of intermediate pressure by-pass regulating valve and low voltage bypass regulating valve is default fixed aperture.

28. double reheat fired power generating unit Bypass Control System as claimed in claim 15, it is characterised in that The system also includes pressure definite value and sets loop；

The pressure definite value sets loop to be used for：Loop is set by default pressure definite value, by high pressure Road, intermediate pressure by-pass and low voltage bypass are pre-seted in the vapour pressure force value of different phase, and to described The elevation rate of pressure value is pre-seted.