NL2033329B1 - System and method for switching steam source of steam-driven feed water pump adapted to deep peak regulation - Google Patents

System and method for switching steam source of steam-driven feed water pump adapted to deep peak regulation Download PDF

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Publication number
NL2033329B1
NL2033329B1 NL2033329A NL2033329A NL2033329B1 NL 2033329 B1 NL2033329 B1 NL 2033329B1 NL 2033329 A NL2033329 A NL 2033329A NL 2033329 A NL2033329 A NL 2033329A NL 2033329 B1 NL2033329 B1 NL 2033329B1
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Netherlands
Prior art keywords
steam
pressure
thermometer
deep peak
small turbine
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NL2033329A
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Dutch (nl)
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NL2033329A (en
Inventor
Bai Peng
Xiao Haifeng
An Lei
Wang Haitao
Lv Chenfeng
Yue Jiaquan
Tan Zengqiang
Niu Guoping
Yin Jiefeng
Jia Linquan
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Xian Xire Boiler Environmental Prot Engineering Co Ltd
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Publication of NL2033329A publication Critical patent/NL2033329A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/08—Adaptations for driving, or combinations with, pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/18—Controlling water feed or water level; Automatic water feeding or water-level regulators for varying the speed or delivery pressure of feed pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/26—Automatic feed-control systems
    • F22D5/32—Automatic feed-control systems influencing the speed or delivery pressure of the feed pumps

Abstract

The invention discloses a system and a method for switching a steam source of a steam—driven feed pump, which are suitable for deep peak regulation. The outlet of the steam inlet pipeline is communicated with the inlet of the steam—driven feed pump, and the outlet of the steam inlet pipeline is communicated with the inlet of the steam—driven feed pump. The system and the method can realize the whole process control of starting, debugging, normal operation and deep peak—shaving low—load working condition operation of the steam—driven feed pump, Improve the operation stability and safety of the steam admission system of the steam feed pump.

Description

SYSTEM AND METHOD FOR SWITCHING STEAM SOURCE OF STEAM-DRIVEN FEED
WATER PUMP ADAPTED TO DEEP PEAK REGULATION
Technical field
The invention belongs to the field of automatic control of a steam-water system of a thermal power plant, and relates to a sys- tem and a method for switching a steam source of a steam-driven feed water pump, which are suitable for deep peak regulation.
Background Technology
In order to accommodate new energy generation, more and more thermal power generating units are flexibly transformed, and with the reduction of deep peak load regulation of the unit, many prob- lems have arisen. Under the deep peak load regulation condition of the unit, the reduction of four-stage steam extraction parameters can not meet the minimum steam inlet parameters of the steam- driven feed pump. In order to solve the operation problem of the steam-driven feed water pump of the unit under the deep peak- shaving working condition and create conditions for further lower- ing the load of the unit, a system and a method are required to be provided to solve the system control problem of the steam-driven feed water pump of the unit under the deep peak-shaving working condition.
Summary of the invention
The invention aims to overcome the defects in the prior art, and provides a system and a method for switching a steam source of a steam-driven feed water pump, which are suitable for deep peak regulation; the system and the method can realize the whole pro- cess control of the steam-driven feed water pump from startup de- bugging, normal operation and deep peak regulation low-load work- ing condition operation, and improve the operation stability and safety of a steam inlet system of the steam-driven fee water pump.
In order to achieve the purpose, the system for switching the steam source of the steam-driven feed water pump suitable for deep peak shaving comprises a small turbine low-pressure steam inlet pipeline, a small turbine debugging steam pipeline, a small tur-
bine deep peak shaving steam pipeline, a steam inlet pipeline and a steam-driven feed water pump;
The outlet of the low pressure steam inlet pipeline of the small turbine, the outlet of the commissioning steam pipeline of the small turbine and the outlet of a deep peak-shaving steam pipeline of a small turbine are all communicated with the inlet of the steam inlet pipeline, and the inlet of the steam inlet pipe- line is communicated with an inlet of a steam-driven feed pump;
A second pressure gauge, a second thermometer, a second elec- tric valve and a first flow met are sequentially arranged on that low-pressure steam inlet pipeline of the small turbine along the circulate direction of a working medium;
A third pressure gauge, a third thermometer and a third elec- tric valve are sequentially arrange on that steam pipeline for the debugging of the small turbine along the flow direction of a work- ing medium;
A fourth pressure gauge, a fourth thermometer, a fourth elec- tric valve, a first regulate valve and a second flow meter are se- quentially arrange on that deep peak regulation steam pipeline of the small turbine along the circulating direction of the working medium;
A first pressure gauge, a first thermometer and a first elec- tric valve are sequentially arrange on that steam inlet pipeline along the circulating direction of the work medium.
A pipeline between the first flow meter and the second elec- tric valve is communicated with the auxiliary steam header through a steam supply pipeline of the auxiliary steam header.
A pipeline between the first flowmeter and the second elec- tric valve is communicated with the deaerator through a steam sup- ply pipeline of the deaerator.
A first pressure gauge, a first thermometer, a first electric valve and a first quick closing check valve are sequentially ar- ranged on the steam inlet pipeline along the circulating direction of a working medium.
A second pressure gauge, a second thermometer, a second quick-closing check valve, a second electric valve, a first flow met and a first check valve are sequentially arranged on that low-
pressure steam inlet pipeline of the small turbine along the cir- culate direction of the working medium.
A fourth pressure gauge, a fourth thermometer, a fourth elec- tric valve, a first regulate valve, a second flowmeter and a sec- ond check valve are sequentially arranged on that deep peak- shaving steam pipeline of the small turbine along the circulate direction of the working medium.
The method for switching the steam source of the steam-driven feed water pump adapted to deep peak regulation comprises the fol- lowing steps of: 1) Set the minimum temperature value t.,;and the minimum pres- sure value P.;at the steam inlet of the steam-driven feedwater pump, set the normal operating temperature value tand the normal operating pressure value P,,, and set the alarm temperature values tysand alarm pressure values Ps; 2) when the unit is in the stage that the steam-driven feed pump is not started for commissioning, opening a third electrical- ly operated valve when the actually measured temperature t;of the commissioning steam detected by a third thermometer is more than or equal to t:sand the pressure P3detected by a third pressure gauge is more than or equal to Py, When the actually measured tem- perature t;iof the steam inlet of the steam-driven feed pump detect- ed by the first thermometer is more than or equal to t.saand the pressure P;idetected by the first pressure gauge is more than or equal to P.4; opening the first electric valve to debug the steam- driven feed pump; The measured temperature t,at the steam inlet of the steam-driven feed water pump detected by the first thermometer and the pressure Pydetected by the first pressure gauge are respec- tively less than the set alarm temperature value ty.and the alarm pressure value Py; When the measured temperature t:of the low pressure steam of the small turbine detected by the second ther- mometer is greater than or equal to t.4and the pressure P.detected by the second pressure gauge is greater than or equal to P.;, go to step 3); 3) after the unit is started, when the actually measured tem- perature t:of the low pressure steam of the small turbine detected by the second thermometer is greater than or equal to tand the pressure P.,detected by the second pressure gauge is greater than or equal to Ps; opening the second electric valve and closing the third electric valve to switch the steam source of the steam- driven feed pump, wherein The measured temperature t:at the steam inlet of the steam-driven feed water pump detected by the first thermometer and the pressure P;detected by the first pressure gauge are respectively less than or equal to the set alarm temperature value ty;and the alarm pressure value Fy; When the load of the unit is reduced, the measured temperature t;of the low pressure steam of the small turbine detected by the second thermometer is close to t:sor the pressure P:detected by the second pressure gauge is close to Pand the load needs to be further reduced, go to step 4);
And 4) when the actually measured temperature t,of the deep peak-shaving steam of the small turbine detected by the fourth thermometer is more than or equal to t.4and the pressure P,detected by the fourth pressure gauge is more than or equal to P.s; opening the fourth electrically operated valve, and regulating the parame- ters of the deep peak-shaving steam of the small turbine through the first regulating valve.
In step 4), when the actually measured temperature t,of the steam for deep peak regulation of the small turbine detected by the fourth thermometer is close to t.jor the pressure Pydetected by the fourth pressure gauge is close to Pa; the steam-driven feed pump does not have the condition for further load reduction.
The invention has the following beneficial effects:
During specific operation, the steam inlet parameters of each steam inlet branch of the steam-driven feed pump are detected in real time and calculated accurately to obtain the steam source se- lection most suitable for the operation of the steam-driven feed pump under the current load, Realize the whole process control of the turbine driven feed water pump from start-up commissioning, normal operation and deep peak load regulation and low load opera- tion, and improve the operation stability and safety of the steam inlet system of the turbine driven feed water pump.
Description of the drawings
Fig. 1 is a system diagram of the present invention;
Among, 1 is a steam-driven feed pump, 2 is a first quick closing check valve, 3 is a first electrically operated valve, 4 is a first thermometer, 5 is the first pressure gauge, 6 is the first check valve, 7 is the first flow meter, 8 is deaerator steam supply pipe, 9 is auxiliary steam header steam supply pipe, 10 is 5 the second electrically operated valve, 11 is the second quick closing check value, 12 is the second thermometer, 13 is second pressure gauge, Reference numeral 14 denotes a third electric valve, 15 a third thermometer, 16 a third pressure gauge, 17 a second check valve, 18 a second flow meter, 19 a first regulating valve, 20 a fourth electric valve, 21 a fourth thermometer, and 22 a fourth pressure gauge.
Detailed description of the invention
In order to enable those in the technical field to better un- derstand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in combination with the drawings in the embodiment of the present invention. obviously, the described em- bodiment is only a part of the embodiment, not a complete embodi- ment, and is not intended to limit the scope disclosed by the pre- sent invention. In addition, in the following description, de- scriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present disclo- sure. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the scope of protection of the present invention.
A schematic diagram of an embodiment accord to that present disclosure is shown in the accompanying drawing. The drawings are not to scale and certain details are exaggerated and may be omit- ted for clarity of presentation. The shapes of various regions and layers and their relative sizes and positions shown in the draw- ings are only examples, and may be deviated due to manufacturing tolerances or technical limitations in practice, and those skilled in the art may additionally design regions/layers with different shapes, sizes and relative positions according to actual needs.
Referring to fig. 1, a steam source switching system of a steam-driven feed water pump adapted to deep peak shaving in the present invention comprises a small turbine low-pressure steam in- let pipeline, a small turbine debugging steam pipeline, a small turbine deep peak shaving steam pipeline, an inlet steam pipeline and a steam-driven feed water pump 1;
The outlet of the low pressure steam inlet pipeline of the small turbine, the outlet of the steam pipeline for debugging the small turbine and the outlet of a steam pipeline for deep peak regulation of the small turbine are all communicated with the in- let of the steam inlet pipeline, and the outlet thereof is commu- nicated with the inlet of a steam-driven feed pump 1; A second pressure gauge 13, a second thermometer 12, a second quick closing check valve 11, a second electric valve 10, a first flowmeter 7 and a first check valve 6 are sequentially arranged on the low- pressure steam inlet pipeline of the small turbine along the cir- culating direction of a working medium, wherein the pipeline be- tween the first flowmeter 7 and the second electric valve 10 is communicated with an auxiliary steam header through an auxiliary steam header steam supply pipeline 9; The pipeline between the first flowmeter 7 and the second electric valve 10 is communicated with the deaerator through the deaerator steam supply pipeline 8.
A third pressure gauge 16, a third thermometer 15 and a third electric door 14 are sequentially arranged on the steam pipeline for commissioning the small turbine along the flowing direction of the working medium;
A fourth manometer 22, a fourth thermometer 21, a fourth electric valve 20, a first regulating valve 19, a second flowmeter 18 and a second check valve 17 are sequentially arranged on the deep peak-shaving steam pipeline of the small turbine along the circulating direction of the working medium;
A first pressure gauge 5, a first thermometer 4, a first electric valve 3 and a first quick closing check valve 2 are se- quentially arranged on the steam inlet pipeline along the circu- lating direction of a working medium;
The first check valve 6 and the second check valve 17 prevent the steam supply systems from being reversed.
The method for switching the steam source of the steam-driven feed water pump adapted to deep peak regulation comprises the fol-
lowing steps of:
1) Set the minimum temperature value t.; and the minimum pres- sure value P‚g at the steam inlet of the steam-driven feed pump 1, set the normal operating temperature value ty, and the normal oper-
ating pressure value P‚, and set the alarm temperature values ty; and alarm pressure values py;
2) when the unit is in the stage of not starting the commis- sioning steam-driven feed pump 1, and when the measured tempera- ture t: of the commissioning steam detected by the third thermome-
ter 15 is greater than or equal to t.,; and the pressure P; detected by the third pressure gauge 16 is greater than or equal to Ps, open the third electrically operated valve 14; When the measured temperature t; at the steam inlet of the steam-driven feedwater pump 1 detected by the first thermometer 4 is greater than or equal to t,; and the pressure P; detected by the first pressure gauge 5 is greater than or equal to P.y; The first electrically op- erated valve 3 is opened for commissioning of the steam feed pump 1, and during the commissioning process, the measured temperature ti at the steam inlet of the steam feed pump 1 detected by the first thermometer 4 and the pressure P; detected by the first pres- sure gauge 5 are respectively less than the set alarm temperature value tp; and the alarm pressure value P;; When the measured tem- perature t, of the low-pressure steam for the small turbine detect- ed by the second thermometer 12 is greater than or equal to t,4 and the pressure P, detected by the second pressure gauge 13 is greater than or equal to P.;, go to step 3);
3) after the unit is started, when the measured temperature t:of the low pressure steam of the small turbine detected by the second thermometer 12 is greater than or equal to t and the pres-
sure P; detected by the second pressure gauge 13 is greater than or equal to P.,, open the second electric valve 10 and close the third electric valve 14 to switch the steam source of the steam-driven feed pump 1; The measured temperature t; at the steam inlet of the steam-driven feedwater pump 1 detected by the first thermometer 4 and the pressure P,; detected by the first pressure gauge 5 are re- spectively less than or equal to the set alarm temperature value ts;and the alarm pressure value Puy.
When the load of the unit de-
creases, the measured temperature t; of the low pressure steam for the small turbine detected by the second thermometer 12 is close to tt; or the pressure P, detected by the second pressure gauge 13 is close to Ps; and the load needs to be further decreased, go to step 4); 4) when the actually measured temperature t, of the steam for deep peak-shaving of the small turbine detected by the fourth thermometer 21 is greater than or equal to t.y and the pressure P, detected by the fourth pressure gauge 22 is greater than or equal to P,, the fourth electric door 20 is opened, and the parameter of the steam for deep peak-shaving of the small turbine is adjusted by the first adjusting valve 19; When the measured temperature t;of the steam for deep peak regulation of the small turbine detected by the fourth thermometer 21 is close to t.; or the pressure P, de- tected by the fourth pressure gauge 22 is close to P.4; the tur- bine-driven feed pump 1 does not have the condition for further lead reduction and needs to be switched to the electric feed pump for operation or shutdown.
Meanwhile, by setting the steam pressure and the temperature of the steam-driven feed pump 1 as system calculation input param- eters, when the unit load changes and the steam inlet parameters change, the steam source is switched in time to ensure the stable operation of the steam-driven feed pump 1.
According to the invention, the steam flow of the steam- driven feed water pump 1 is introduced into the control system, and the flow parameters are regulated by the regulating valve, so that the steam inlet precise control of the deep peak regulation low-load working condition is met.
In that invention, the steam inlet parameter of each steam inlet system of the steam-driven feed pump 1 are detect in real time and calculated accurately to obtain the steam source selec- tion which is most suitable for the operation of the steam driven feed pump 1 under the current load, To ensure long-term stable and safe operation of the unit under deep peak-shaving conditions.

Claims (8)

CONCLUSIESCONCLUSIONS 1. Door een stoomaanvoerpomp aangedreven stoombronschakelsysteem aangepast aan diepe piekregeling, omvattende een lagedrukstoomin- laatleiding van de kleine turbine, een stoomleiding voor inbe- drijfstelling van de kleine turbine, een stoomleiding voor diepe piekregeling van de kleine turbine, een stoominlaatleiding en een stoomaanvoerpomp (1); de uitlaat van de lagedrukstoominlaatleiding van de kleine turbi- ne, de uitlaat van de stoompijpleiding voor de inbedrijfstelling van de kleine turbine en de uitlaat van een stoompijpleiding voor de diepe-piekregeling van de kleine turbine zijn alle verbonden met de inlaat van de stoominlaatleiding; een tweede drukmeter (13), een tweede thermometer (12), een tweede elektrische klep (10) en een eerste debietmeter (7) zijn achter- eenvolgens aangebracht op die lagedrukstoominlaatleiding van de kleine turbine langs de circulatierichting van een werkmedium; een derde manometer (16), een derde thermometer (15) en een derde elektrische klep (14) zijn achtereenvolgens geplaatst op die stoomleiding voor de inbedrijfstelling van de kleine turbine langs de stroomrichting van een werkmedium; Een vierde manometer (22), een vierde thermometer (21), een vierde elektrische klep (20), een eerste regelklep (19) en een tweede de- bietmeter (18) zijn achtereenvolgens geplaatst op die diepe piek- regelingstoompijpleiding van de kleine turbine langs de circula- tierichting van het werkmedium; een eerste drukmeter (5), een eerste thermometer (4) en een eerste elektrische deur (3) worden achtereenvolgens geplaatst op die stoominlaatleiding langs de circulatierichting van het werkmedium.1. Steam supply pump driven steam source switching system adapted to deep peak control, comprising a low pressure steam inlet line from the small turbine, a steam line for commissioning the small turbine, a steam line for deep peak control of the small turbine, a steam inlet line and a steam supply pump (1 ); the outlet of the small turbine low pressure steam inlet line, the outlet of the small turbine commissioning steam pipeline and the outlet of a small turbine deep peak control steam pipeline are all connected to the inlet of the steam inlet line; a second pressure gauge (13), a second thermometer (12), a second electric valve (10) and a first flow gauge (7) are arranged sequentially on said low-pressure steam inlet pipe of the small turbine along the circulation direction of a working fluid; a third pressure gauge (16), a third thermometer (15) and a third electric valve (14) are arranged sequentially on said steam pipe for operating the small turbine along the flow direction of a working medium; A fourth pressure gauge (22), a fourth thermometer (21), a fourth electric valve (20), a first control valve (19) and a second flow meter (18) are arranged sequentially on said deep peak control steam pipeline of the small turbine along the direction of circulation of the working medium; a first pressure gauge (5), a first thermometer (4) and a first electric door (3) are sequentially placed on said steam inlet pipe along the circulation direction of the working medium. 2. Stoombronschakelsysteem voor een door stoom aangedreven voe- dingswaterpomp aangepast aan diepe piekscheiding volgens conclusie 1, waarin een pijpleiding tussen de eerste debietmeter (7) en de tweede elektrische klep (10) in verbinding staat met een hulp- stoomheader via een hulpstoomtoevoerleiding (9).A steam source switching system for a steam driven feed water pump adapted to deep peak separation according to claim 1, wherein a pipeline between the first flow meter (7) and the second electric valve (10) communicates with an auxiliary steam header via an auxiliary steam supply line (9 ). 3. Stoombronschakelsysteem voor een door stoom aangedreven voe- dingspomp aangepast aan diepe piekscheiding volgens conclusie 1, waarin een leiding tussen de eerste debietmeter (7) en de tweede elektrische klep (10) in verbinding staat met de luchtafscheider via een stoomtoevoerleiding voor de luchtafscheider (8).A steam source switching system for a steam driven feed pump adapted to deep peak separation according to claim 1, wherein a conduit between the first flowmeter (7) and the second electric valve (10) communicates with the air separator via a steam supply line for the deaerator ( 8). 4. Stoombronschakelsysteem voor een door stoom aangedreven voe- dingspomp aangepast aan diepe piekscheiding volgens conclusie 1, waarin een eerste manometer (5), een eerste thermometer (4), een eerste elektrische klep (3) en een eerste snelsluitende terugslag- klep (2) achtereenvolgens zijn aangebracht op de stoominlaat langs de circulatierichting van het werkmedium.A steam source switching system for a steam driven feed pump adapted to deep peak separation according to claim 1, wherein a first pressure gauge (5), a first thermometer (4), a first electric valve (3) and a first quick closing check valve (2 ) are successively arranged on the steam inlet along the circulation direction of the working medium. 5. Stoombronschakelsysteem voor een door stoom aangedreven voe- dingspomp aangepast aan diepe piekscheiding volgens conclusie 4, waarin En een tweede manometer (13), een tweede thermometer (12), een tweede snelsluitende terugslagklep (11), de tweede elektrische klep (10), de eerste debietmeter (7) en de eerste terugslagklep {6) achtereenvolgens zijn geplaatst op de lagedrukstoominlaatlei- ding van de kleine turbine langs de circulatierichting van een werkmedium.A steam source switching system for a steam driven feed pump adapted to deep peak separation according to claim 4, wherein E comprises a second pressure gauge (13), a second thermometer (12), a second quick-closing check valve (11), the second electric valve (10) , the first flow meter (7) and the first check valve {6) are arranged sequentially on the low-pressure steam inlet pipe of the small turbine along the circulation direction of a working medium. 6. Stoombronschakelsysteem voor een door stoom aangedreven voe- dingspomp aangepast aan diepe piekscheiding volgens conclusie 5, waarin een vierde manometer (22), een vierde thermometer (21), een vierde elektrisch bediende klep (20), een eerste regelklep (19), de tweede debietmeter (18) en een tweede terugslagklep (17) ach- tereenvolgens zijn geplaatst op de stoomleiding voor diepe piekre- geling van de kleine turbine langs de circulatierichting van het werkmedium.A steam source switching system for a steam driven feed pump adapted to deep peak separation according to claim 5, wherein a fourth pressure gauge (22), a fourth thermometer (21), a fourth electrically operated valve (20), a first control valve (19), the second flow meter (18) and a second check valve (17) are arranged sequentially on the deep peak control steam line of the small turbine along the circulation direction of the working medium. 7. Werkwijze voor het omschakelen van de stoombron van een stoom- gevoede voedingswaterpomp aangepast aan diepe piekscheiding, om- vattende de volgende stappen: 1) stel de minimumtemperatuurwaarde t.; en de minimumdrukwaarde Pzdat de stoominlaat van de stoomgedreven voedingswaterpomp (1), stel de normale bedrijfstemperatuurwaarde t, en de normale be-A method of switching the steam source of a steam fed feed water pump adapted to deep peak separation, comprising the steps of: 1) setting the minimum temperature value t.; and the minimum pressure value Pzthat the steam inlet of the steam driven feed water pump (1), set the normal operating temperature value t, and the normal operating drijfsdrukwaarde Py, in, en stel de alarmtemperatuurwaarden t:; en de alarmdrukwaarden Py; in; 2) wanneer de eenheid zich in de fase bevindt waarin de door stoom aangedreven voedingspomp (1) niet wordt gestart en de door de der- de thermometer (15) gemeten temperatuur t3 van de debugstoom hoger is dan of gelijk is aan t,; en de door de derde manometer (16) ge- meten druk P; hoger is dan of gelijk is aan P.4, wanneer de werke- lijk gemeten temperatuur tl aan de stoominlaat van de stoomaan- voerpomp (1), gemeten door de eerste thermometer (4), hoger is dan of gelijk is aan t,4 en de druk P,, gemeten door de eerste manome- ter (5), hoger is dan of gelijk is aan Ps, wordt de eerste elek- trische klep (3) geopend om de stoomaanvoerpomp (1) te debuggen, en tijdens het debuggingsproces zijn de gemeten temperatuur t: aan de stoominlaat van de stoomtoevoerpomp (1), gedetecteerd door de eerste thermometer (4), en de druk P;, gedetecteerd door de eerste manometer (5), respectievelijk lager dan de ingestelde alarmtempe- ratuurwaarde t;; en de alarmdrukwaarde Py; wanneer de werkelijk ge- meten temperatuur t: van de lagedrukstoom van de kleine turbine, gemeten door de tweede thermometer (12), groter is dan of gelijk is aan t,; en de druk P,, gemeten door de tweede manometer (13), groter is dan of gelijk is aan P‚4, ga dan naar stap 3); 3) nadat het apparaat is gestart, wanneer de gemeten temperatuur t- van de lagedrukstoom van de kleine turbine, gedetecteerd door de tweede thermometer (12}, groter is dan of gelijk is aan t.,; en de druk P:, gedetecteerd door de tweede manometer (13), groter is dan of gelijk is aan Py, het openen van de tweede elektrisch bediende deur (10), de derde elektrische klep (14) wordt gesloten om de stoombron van de stoomtoevoerpomp (1) te schakelen, de gemeten temperatuur t; aan de stoominlaat van de stoomtoevoerpomp (1), ge- detecteerd door de eerste thermometer (4), en de druk P;, gedetec- teerd door de eerste manometer (5), zijn respectievelijk lager dan of gelijk aan een ingestelde alarmtemperatuurwaarde t,; en een alarmdrukwaarde Py; wanneer de belasting van de eenheid afneemt, de door de tweede thermometer (12) gemeten temperatuur t, van de lagedrukstoom van de kleine turbine dicht bij tt ligt, of de door de tweede manometer (13) gemeten druk P, dicht bij P, ligt, en de belasting verder moet worden verminderd, ga dan naar stap 4);driving pressure value Py, and set the alarm temperature values t:; and the alarm pressures Py; in; 2) when the unit is in the stage where the steam-driven feed pump (1) is not started and the temperature t3 of the debug steam measured by the third thermometer (15) is greater than or equal to t1; and the pressure P measured by the third manometer (16); is higher than or equal to P.4, when the actual measured temperature tl at the steam inlet of the steam supply pump (1), measured by the first thermometer (4), is higher than or equal to t,4 and the pressure P, measured by the first pressure gauge (5), is greater than or equal to Ps, the first electric valve (3) is opened to debug the steam supply pump (1), and during the debugging process the measured temperature t: at the steam inlet of the steam supply pump (1), detected by the first thermometer (4), and the pressure P;, detected by the first pressure gauge (5), are respectively lower than the set alarm temperature value t; ; and the alarm pressure value Py; when the actual measured temperature t: of the low-pressure steam from the small turbine, measured by the second thermometer (12), is greater than or equal to t1; and the pressure P, measured by the second pressure gauge (13), is greater than or equal to P, then go to step 3); 3) after the device is started, when the measured temperature t of the low-pressure steam of the small turbine, detected by the second thermometer (12}, is greater than or equal to t., and the pressure P:, detected by the second pressure gauge (13), is greater than or equal to Py, the opening of the second electrically operated door (10), the third electrical valve (14) is closed to switch the steam source of the steam supply pump (1), the measured temperature t; at the steam inlet of the steam supply pump (1), detected by the first thermometer (4), and the pressure P;, detected by the first pressure gauge (5), are respectively lower than or equal to a set alarm temperature value t,; and an alarm pressure value Py; when the unit load decreases, the temperature t, measured by the second thermometer (12), of the low-pressure steam from the small turbine is close to tt, or the temperature measured by the second pressure gauge (13 ) measured pressure P is close to P, and the load needs to be reduced further, go to step 4); 4) wanneer de werkelijk gemeten temperatuur t4 van de stoom voor de diepe piekregeling van de kleine turbine, gemeten door de vierde thermometer (21), groter is dan of gelijk is aan t.; en de druk Pg, gemeten door de vierde manometer (22), groter is dan of gelijk is aan P.4, de vierde elektrisch bediende klep (20) openen en de para- meters van de stoom voor de diepe piekregeling van de kleine tur- bine regelen via de eerste regelklep (19).4) when the actual measured temperature t4 of the steam for the deep peak control of the small turbine, measured by the fourth thermometer (21), is greater than or equal to t.; and the pressure Pg, measured by the fourth pressure gauge (22), is greater than or equal to P.4, the fourth electrically operated valve (20) opens, and the parameters of the steam for the deep peak control of the small tur - regulate bin via the first control valve (19). 8. Werkwijze voor het omschakelen van de stoombron van de stoomge- voede voedingswaterpomp aangepast aan diepe piekscheiding volgens conclusie 7, waarbij in stap 4), wanneer de werkelijk gemeten tem- peratuur t« van de stoom voor diepe piekregeling van de kleine tur- bine, gedetecteerd door de vierde thermometer (21), dicht bij tag ligt of de druk P;, gedetecteerd door de vierde manometer (22), dicht bij Ps ligt, de stoomgevoede voedingspomp (1) niet de voor- waarde heeft voor verdere belastingvermindering.The method of switching the steam source of the steam-supplied feed water pump adapted to deep peak separation according to claim 7, wherein in step 4), when the actual measured temperature t< of the steam for deep peak control of the small turbine , detected by the fourth thermometer (21), is close to tag or the pressure P i , detected by the fourth manometer (22), is close to Ps, the steam-powered feed pump (1) does not have the condition for further load reduction.
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