CN110219707A - A kind of control and guard method that double low pressure (LP) cylinder turbine low pressure cylinders zero are contributed - Google Patents
A kind of control and guard method that double low pressure (LP) cylinder turbine low pressure cylinders zero are contributed Download PDFInfo
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- CN110219707A CN110219707A CN201910567321.2A CN201910567321A CN110219707A CN 110219707 A CN110219707 A CN 110219707A CN 201910567321 A CN201910567321 A CN 201910567321A CN 110219707 A CN110219707 A CN 110219707A
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- 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
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a kind of controls and guard method that double low pressure (LP) cylinder turbine low pressure cylinders zero are contributed, belong to the technical field of thermal power steam turbine power generation, the regenerative steam of A low pressure (LP) cylinder and B low pressure (LP) cylinder is subjected to isolation design, using the butterfly valve A and butterfly valve B that can be fully sealed cut off respectively A low pressure (LP) cylinder and B low pressure (LP) cylinder all into vapour, individual cooling steam bypass is respectively set to be passed through a small amount of cooling steam for A low pressure (LP) cylinder and B low pressure (LP) cylinder, generated air blast heat when for taking away the operation of the power output of A low pressure (LP) cylinder zero or the power output operation of B low pressure (LP) cylinder zero, deh control system, which passes through, carries out the aperture that control adjusts different valves, to realize low pressure (LP) cylinder A, low pressure (LP) cylinder B separately or concurrently puts into/exits the power output operation of low pressure (LP) cylinder zero.
Description
Technical field
It is low in particular to a kind of double low pressure (LP) cylinder steam turbines the invention belongs to the technical field of thermal power steam turbine power generation
The control and guard method that cylinder pressure zero is contributed.
Background technique
With the continuous improvement of Living consumption, central heating demand constantly increases, and thermoelectricity thermal power plant unit is as confession
The important source of heat source, the requirement to its heating load is higher and higher, and low pressure (LP) cylinder zero contributes running technology primarily to meeting
The growth requirement in heat supply market utmostly plays the heat capacity of unit, and it is " fixed with heat to change simultaneously most of unit at present
The operational mode of electricity " realizes that unit is especially the peak modulation capacity in heat supply running, to receive more development of renewable energies
Electricity.
Low pressure (LP) cylinder zero contributes running technology primarily to meet the growth requirement in heat supply market, utmostly plays steamer
The heat capacity of unit changes simultaneously the operational mode of most of unit " electricity determining by heat " at present, realizes that Steam Turbine is especially
Peak modulation capacity in heat supply running, to receive more renewable energy power generations.The existing mono- low pressure (LP) cylinder vapour of 300MW domestic before this
The achievement of the power output transformation of turbine low pressure (LP) cylinder zero, and for 600MW and the double low pressure (LP) cylinder Steam Turbines of ratings above, it would be highly desirable to propose four
Control and the protection scheme of double low pressure (LP) cylinder (low pressure (LP) cylinder A and low pressure (LP) cylinder B) low pressure (LP) cylinder zero power output operations are shunted, to solve to be directed to steamer
The growing heat demand of unit limits the status contradicted with structure.
Summary of the invention
In consideration of it, in order to solve the above problems existing in the present technology, the purpose of the present invention is to provide a kind of double low pressure
Purpose of the control and guard method that cylinder turbine low pressure cylinder zero is contributed to reach.
The technical scheme adopted by the invention is as follows: a kind of control method that double low pressure (LP) cylinder turbine low pressure cylinders zero are contributed, packet
Include high pressure cylinder, intermediate pressure cylinder, A low pressure (LP) cylinder, B low pressure (LP) cylinder and the deh control system being set in double low pressure (LP) cylinder steam turbines, the control method
Include:
(1) steam drain of intermediate pressure cylinder is respectively communicated to the air intake of A low pressure (LP) cylinder and B low pressure (LP) cylinder through main pipeline, and each
A butterfly valve and B butterfly valve are respectively equipped on main pipeline；The steam drain of intermediate pressure cylinder is respectively communicated to A low pressure (LP) cylinder through bypass duct and B is low
The air intake of cylinder pressure, and A regulating valve and B regulating valve are respectively equipped on each bypass duct；
Five sections of isolating valves of A low pressure (LP) cylinder and B low pressure (LP) cylinder will be respectively equipped on five sections of suction branch of A low pressure (LP) cylinder and B low pressure (LP) cylinder
The two is simultaneously connected to by five sections of isolating valves；Six sections of A low pressure (LP) cylinder will be respectively equipped on six sections of suction branch of A low pressure (LP) cylinder and B low pressure (LP) cylinder
The two is simultaneously connected to by isolating valve and six sections of isolating valves of B low pressure (LP) cylinder；
Heat supply bleed steam pipework is connected on the steam drain of medium pressure cylinder, heat supply bleed steam pipework is equipped with safety valve, takes out
Vapour check-valves, steam extraction fast valve and the electronic shut-off valve of steam extraction；
(2) it reviews and validate every operating parameter and is in normal condition；
(3) A butterfly valve, five sections of isolating valves of A low pressure (LP) cylinder, A low pressure the power output of A low pressure (LP) cylinder zero operation: are adjusted by deh control system
Six sections of isolating valves of cylinder and B regulating valve are in close state, meanwhile, adjust B butterfly valve, five sections of isolating valves of B low pressure (LP) cylinder, B low pressure (LP) cylinder six
Section isolating valve and A regulating valve are in the open state；
The power output operation of B low pressure (LP) cylinder zero: B butterfly valve, five sections of isolating valves of B low pressure (LP) cylinder, B low pressure (LP) cylinder are adjusted by deh control system
Six sections of isolating valves and A regulating valve are in close state, meanwhile, adjust A butterfly valve, five sections of isolating valves of A low pressure (LP) cylinder, six sections of A low pressure (LP) cylinder
Isolating valve and B regulating valve are in the open state；
The double power output of low pressure (LP) cylinder zero operations: it is cut off by deh control system operation A low pressure (LP) cylinder excision movement and B low pressure (LP) cylinder dynamic
Make, wherein A low pressure (LP) cylinder excision movement are as follows: six sections of adjustment A butterfly valve, five sections of isolating valves of A low pressure (LP) cylinder and A low pressure (LP) cylinder isolating valves are closed
And A regulating valve is opened, B low pressure (LP) cylinder excision movement are as follows: adjustment B butterfly valve, five sections of isolating valves of B low pressure (LP) cylinder and six sections of B low pressure (LP) cylinder isolation
Valve closes and opens B regulating valve.
Further, A low pressure (LP) cylinder excision movement execution synchronous with B low pressure (LP) cylinder excision movement or substep execute in described (3).
Further, in the power output of A low pressure (LP) cylinder zero operation, the aperture for first passing through deh control system adjustment A butterfly valve is
19%-21%, then by the aperture quick closedown of A butterfly valve to 0, and the quick closedown time is less than 20s；
In the power output of B low pressure (LP) cylinder zero operation, the aperture for first passing through deh control system adjustment B butterfly valve is 19%-21%,
Again by the aperture quick closedown of B butterfly valve to 0, and the quick closedown time is less than 20s；
In the power output of double low pressure (LP) cylinders zero operation, synchronous deh control system or substep adjustment A butterfly valve and B butterfly valve are first passed through
Aperture be 19%-21%, then by A butterfly valve is synchronous with the aperture of B butterfly valve or substep quick closedown is to 0, and the quick closedown time
Less than 20s.
Further, equipped with the spray desuperheating system cooling to its steam inside on the bypass channel, starting water spray subtracts
Warm system and monitor intermediate pressure cylinder steam drain temperature T1, A low pressure (LP) cylinder air intake temperature T2 and B low pressure (LP) cylinder air intake temperature
T3 should meet: T1-T2 > 50 DEG C, T1-T3 > 50 DEG C.
Further, the power output of A low pressure (LP) cylinder zero operation, the operation of the power output of B low pressure (LP) cylinder zero and double low pressure (LP) cylinders are being executed
Before zero power output operation, the throttle flow of the high pressure cylinder should be reduced to the 45%-55% of its rated steam inlet amount.
Further, the power output of A low pressure (LP) cylinder zero operation, the operation of the power output of B low pressure (LP) cylinder zero and double low pressure (LP) cylinders zero is executed to contribute
The aperture of steam extraction fast valve described in synchronous adjustment is both needed to when operation.
Further, the power output of A low pressure (LP) cylinder zero operation, the operation of the power output of B low pressure (LP) cylinder zero and double low pressure (LP) cylinders zero is executed to contribute
When operation, the condensed water of the heat supply bleed steam pipework is recycled and supplemented.
A kind of guard method that double low pressure (LP) cylinder turbine low pressure cylinders zero are contributed, the guard method are based on above-mentioned double low pressure (LP) cylinder vapour
The control method that turbine low pressure (LP) cylinder zero is contributed comprising:
(1) the steam drain pressure P1 of intermediate pressure cylinder is monitored, if pressure P1 is greater than predetermined value, feedback signal to DEH, which controls, is
System, deh control system individually or simultaneously adjust the aperture of A butterfly valve and B butterfly valve；
(2) three sections of suction branch pressure P2 of intermediate pressure cylinder are monitored and calculate the pressure difference between pressure P2 and pressure P1, if pressure
Difference is greater than predetermined value, then feedback signal to deh control system, and deh control system adjusts A butterfly valve, B butterfly valve or the electronic shutdown of steam extraction
The aperture of valve；
(3) the steam drain temperature T1 of intermediate pressure cylinder is monitored, if temperature T1 is greater than predetermined value, feedback signal to DEH, which controls, is
System reduces the exhaust steam pressure of intermediate pressure cylinder, the aperture of adjustment A butterfly valve or B butterfly valve by deh control system；
(4) the swollen difference of low pressure (LP) cylinder is monitored, if the swollen difference of low pressure (LP) cylinder is greater than preset value and the A low pressure (LP) cylinder zero power output operation, is led to
Cross the aperture of deh control system adjustment A butterfly valve；If difference that low pressure (LP) cylinder is swollen is greater than preset value and the B low pressure (LP) cylinder zero power output operation,
The aperture of B butterfly valve is adjusted by deh control system；
(5) if execute the power output of A low pressure (LP) cylinder zero operation, the second last stage blade temperature T4 and final stage of A low pressure (LP) cylinder are monitored
Leaf temperature T5 adjusts what corresponding bypass channel was arranged by deh control system if temperature T4 or temperature T5 is greater than preset value
Spray desuperheating system opens A butterfly valve；
If execute the power output of B low pressure (LP) cylinder zero operation, the second last stage blade temperature T6 and exhaust stage blade of B low pressure (LP) cylinder are monitored
Temperature T7 adjusts the water spray that corresponding bypass channel is arranged by deh control system if temperature T6 or temperature T7 is greater than preset value
Temperature reducing system opens B butterfly valve.
Further, if execute the power output of A low pressure (LP) cylinder zero operation, B low pressure (LP) cylinder is not more than 30t/h into steam flow amount；
If execute the power output of B low pressure (LP) cylinder zero operation, A low pressure (LP) cylinder is not more than 30t/h into steam flow amount.
Further, if described (3) are in the double power output of low pressure (LP) cylinder zero operations, and temperature T1 is greater than predetermined value, then passes through
Deh control system reduces the exhaust steam pressure of intermediate pressure cylinder or opens A butterfly valve and B butterfly valve simultaneously；
Described if (3) are in the power output operation of A low pressure (LP) cylinder zero, and temperature T1 is greater than predetermined value, then passes through deh control system
It reduces the exhaust steam pressure of intermediate pressure cylinder or opens A butterfly valve；
When described (3) are in the power output operation of B low pressure (LP) cylinder zero, and temperature T1 is greater than predetermined value, then is dropped by deh control system
The exhaust steam pressure of low intermediate pressure cylinder opens B butterfly valve.
The invention has the benefit that
1. the control method of double low pressure (LP) cylinder turbine low pressure cylinders zero power output provided through the invention, low by A low pressure (LP) cylinder and B
The regenerative steam of cylinder pressure carries out isolation design, cuts off A low pressure (LP) cylinder and B low pressure respectively using the butterfly valve A and butterfly valve B that can be fully sealed
Cylinder all into vapour, individual cooling steam bypass is respectively set for A low pressure (LP) cylinder and B low pressure (LP) cylinder to be passed through a small amount of cooling steam
Vapour, generated air blast heat, deh control system when for taking away the operation of the power output of A low pressure (LP) cylinder zero or the power output operation of B low pressure (LP) cylinder zero
The aperture of different valves is adjusted, by carrying out control to realize that low pressure (LP) cylinder A, low pressure (LP) cylinder B separately or concurrently put into/exit low pressure (LP) cylinder zero
Power output operation.
2. the guard method of double low pressure (LP) cylinder turbine low pressure cylinders zero power output provided through the invention, by double low pressure (LP) cylinders
It increases multiple monitoring points in steam turbine operation system newly, and the information of each monitoring point is acquired in real time, through deh control system
After the monitoring data of each monitoring point are compared, corresponding valve switch movement can be controlled, to ensure double low pressure (LP) cylinders
The normal even running of steam turbine.
Detailed description of the invention
Fig. 1 is the system diagram for the control method that double low pressure (LP) cylinder turbine low pressure cylinders zero provided by the invention are contributed；
It is marked in attached drawing as follows:
1-safety valve；2-extraction check valves；3-steam extraction fast valves；The electronic shut-off valve of 4-steam extractions；5-A butterfly valves；6—B
Butterfly valve；7-A regulating valves；8-B regulating valves；9-A steam-flow meters；10-A spray desuperheating systems；11-B steam-flow meters；
12-B spray desuperheating systems；13-five sections of A low pressure (LP) cylinder isolating valves；14-six sections of A low pressure (LP) cylinder isolating valves；15-five sections of B low pressure (LP) cylinders
Isolating valve；16-six sections of B low pressure (LP) cylinder isolating valves；
The middle row's temperature sensor of t1-；The middle row pressure force snesor of p1-；Temperature sensor before t2-A；Pressure passes before p2-A
Sensor；Temperature sensor before t3-B；Pressure sensor before p3-B；Temperature sensor after t4-A；Pressure sensor after p4-A；
Temperature sensor after t5-B；Pressure sensor after p5-B；The left second last stage blade temperature sensor of t6-A；The right penult of t7-A
Leaf temperature sensor；The left second last stage blade temperature sensor of t8-B；The right second last stage blade temperature sensor of t9-B；t10—A
Left exhaust stage blade temperature sensor；The right exhaust stage blade temperature sensor of t11-A；The left exhaust stage blade temperature sensor of t12-B；
The right exhaust stage blade temperature sensor of t13-B；Δ p1-differential pressure indicator；S-exhaust stage blade safety monitoring system.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the embodiment of the present invention, it should be noted that indicating position or positional relationship is based on shown in attached drawings
The orientation or positional relationship invention product using when the orientation or positional relationship usually put or this field
Orientation or positional relationship that technical staff usually understands or the invention product using when the orientation usually put or position close
System, is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must have
Specific orientation is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " the
One ", " second " is only used for distinguishing description, is not understood to indicate or imply relative importance.
In the description of the embodiment of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term
" setting ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally connect
It connects；It can be and be directly connected to, can also be indirectly connected with by intermediary.For the ordinary skill in the art, may be used
The attached drawing in the concrete meaning type embodiment of above-mentioned term in the present invention is understood with concrete condition, in the embodiment of the present invention
Technical solution is clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than complete
The embodiment in portion.The component of embodiments of the present invention, which are generally described and illustrated herein in the accompanying drawings can be with a variety of different configurations
To arrange and design.
Embodiment 1
A kind of control method that double low pressure (LP) cylinder turbine low pressure cylinders zero are contributed is provided in the present embodiment, including is set to double
High pressure cylinder, intermediate pressure cylinder, A low pressure (LP) cylinder, B low pressure (LP) cylinder and deh control system, double low pressure (LP) cylinder steam turbines in low pressure (LP) cylinder steam turbine belong to
Existing equipment in this method is transformed to its local vapour road, with reach can be realized low pressure (LP) cylinder A, low pressure (LP) cylinder B respectively or
The purpose of the power output operation of low pressure (LP) cylinder zero is put into/exits simultaneously, those skilled in the art should know the interior of double low pressure (LP) cylinder steam turbines
Assembly relation between cage structure and high pressure cylinder, intermediate pressure cylinder, A low pressure (LP) cylinder, B low pressure (LP) cylinder and deh control system.
The control method includes:
(1) steam drain of intermediate pressure cylinder is respectively communicated to the air intake of A low pressure (LP) cylinder and B low pressure (LP) cylinder through main pipeline, and each
A butterfly valve 5 and B butterfly valve 6 are respectively equipped on main pipeline, and between the branch point of the main pipeline and the air intake of A low pressure (LP) cylinder and the master
A butterfly valve 5 and B butterfly valve 6 are respectively equipped between the branch point of pipeline and the air intake of B low pressure (LP) cylinder.
By the steam drain of intermediate pressure cylinder through A bypass duct and B bypass duct be respectively communicated to A low pressure (LP) cylinder and B low pressure (LP) cylinder into
Steam ports, and A regulating valve 7 and B regulating valve 8 are respectively equipped on A bypass duct and B bypass duct；That is: by the one of A bypass duct
End is connected to the steam drain of intermediate pressure cylinder, and the other end is connected to the air intake of the A low pressure (LP) cylinder, is successively arranged A on A bypass duct
Regulating valve 7, A steam-flow meter 9 and A spray desuperheating system 10, are successively arranged B regulating valve 8, B steam flow on B bypass duct
Count 11 and B spray desuperheating system 12.It should be noted that being thrown to reduce thermal shock of the cooling steam to low pressure flow passage component
When entering or cutting off cooling steam, temperature rise/temperature drop rate of cooling steam should be rationally controlled.
Five sections of isolating valves 13 of A low pressure (LP) cylinder and B low pressure will be respectively equipped on five sections of suction branch of A low pressure (LP) cylinder and B low pressure (LP) cylinder
The two is simultaneously connected to by five sections of isolating valves 15 of cylinder；A low pressure (LP) cylinder will be respectively equipped on six sections of suction branch of A low pressure (LP) cylinder and B low pressure (LP) cylinder
The two is simultaneously connected to by six sections of isolating valves 14 and six sections of isolating valves 16 of B low pressure (LP) cylinder；Specific connection type: five sections of steam extractions of A low pressure (LP) cylinder
Five sections of suction branch of branch pipe and B low pressure (LP) cylinder are interconnected and the two is respectively equipped with five sections of isolating valves 13 of A low pressure (LP) cylinder and B low pressure (LP) cylinder
Six sections of suction branch of five sections of isolating valves 15, six sections of suction branch of A low pressure (LP) cylinder and B low pressure (LP) cylinder are interconnected and the two is set respectively
There are six sections of isolating valves 16 of six sections of isolating valves 14 of A low pressure (LP) cylinder and B low pressure (LP) cylinder.
Heat supply bleed steam pipework is connected on the steam drain of medium pressure cylinder, heat supply bleed steam pipework is equipped with safety valve 1, takes out
Vapour check-valves 2, steam extraction fast valve 3 and the electronic shut-off valve 4 of steam extraction；Specific connection type is as follows: adding in the steam drain of intermediate pressure cylinder
Steam extraction four-way is communicated with the steam drain of intermediate pressure cylinder, main pipeline, heating extraction line and bypass duct respectively, and A low pressure (LP) cylinder and B
Threeway is equipped at the air intake of low pressure (LP) cylinder, threeway is communicated with main pipeline, the air intake of low pressure (LP) cylinder and bypass duct respectively.
(2) it reviews and validate every operating parameter and is in normal condition；Specifically include the inspection and confirmation of the following contents:
2.1) before executing the power output operation of A low pressure (LP) cylinder zero:
2.1.1) heat supply bleed steam pipework puts into operation；2.1.2 the exhaust stage blade protection of A low pressure (LP) cylinder) is released；
2.1.3) release double low pressure (LP) cylinder steam-turbine units heat supply throttle flow allow investment condition (such as larger than 70% it is specified into
Steam flow amount)；2.1.4 after) confirming that A butterfly valve 5 and 7 activity of A regulating valve are normal, the minimum limit aperture of A butterfly valve 5 is released, confirmation A is adjusted
Valve 7 allows standard-sized sheet；2.1.5 the logic of the low interlocking close A spray desuperheating system 10 of A low pressure (LP) cylinder exhaust temperature) is released (as being lower than 47
DEG C when stop water spray)；2.1.6) confirmation AC/DC oil pump connection opens working properly；2.1.7) check that confirmation A regulating valve 7 is in complete
Open position, A steam-flow meter 9 are shown normally；2.1.8 it) checks and confirms double low pressure (LP) cylinder turbine body vibrations, Wa Wen, axial displacement, swollen
The parameters such as difference, cylinder temperature are shown normally；2.1.9 the shaft seal steam temperature (such as to 130-140 DEG C) of A low pressure (LP) cylinder) is suitably reduced, in advance
It is appropriate to reduce the swollen difference of low pressure (LP) cylinder.
2.2) before executing the power output operation of B low pressure (LP) cylinder zero:
2.2.1) heat supply bleed steam pipework puts into operation；2.2.2 the exhaust stage blade protection of B low pressure (LP) cylinder) is released；
2.2.3) release double low pressure (LP) cylinder steam-turbine units heat supply throttle flow allow investment condition (such as larger than 70% it is specified into
Steam flow amount)；2.2.4 after) confirming that B butterfly valve 6 and 8 activity of B regulating valve are normal, the minimum limit aperture of B butterfly valve 6 is released, confirmation B is adjusted
Valve 8 allows standard-sized sheet；2.2.5 the logic of the low interlocking close B spray desuperheating system 12 of B low pressure (LP) cylinder exhaust temperature) is released (as being lower than 47
DEG C when stop water spray)；2.2.6) confirmation AC/DC oil pump connection opens working properly；2.2.7) check that confirmation B regulating valve 8 is in complete
Open position, B steam-flow meter 11 are shown normally；2.2.8) check confirm double low pressure (LP) cylinder turbine body vibrations, Wa Wen, axial displacement,
The parameters such as swollen poor, cylinder temperature are shown normally；2.2.9 the shaft seal steam temperature (such as to 130-140 DEG C) for) suitably reducing B low pressure (LP) cylinder, mentions
The swollen difference of preceding appropriate reduction low pressure (LP) cylinder.
2.3) before executing the double power output of low pressure (LP) cylinder zero operations:
2.3.1) heat supply bleed steam pipework puts into operation；2.3.2 the exhaust stage blade protection of A low pressure (LP) cylinder and B low pressure (LP) cylinder) is released；
2.3.3 the heat supply throttle flow for) releasing double low pressure (LP) cylinder steam-turbine units allows investment condition (such as larger than 70% rated steam inlet flow)；
2.3.4 after) confirming A butterfly valve 5,8 activity normally of B butterfly valve 6, A regulating valve 7 and B regulating valve, A butterfly valve 5 and 6 irreducible minimum of B butterfly valve are released
Position aperture confirms that A regulating valve 7 and B regulating valve 8 allow standard-sized sheet；2.3.5 the low interlocking close A spray of A low pressure (LP) cylinder exhaust temperature) is released
The logic of the low interlocking close B spray desuperheating system 12 of logic and B low pressure (LP) cylinder exhaust temperature of water temperature reducing system 10 is (as being lower than 47 DEG C
When stop water spray)；2.3.6) confirmation AC/DC oil pump connection opens working properly；2.3.7 confirmation A regulating valve 7 and B regulating valve) are checked
8 are in standard-sized sheet position, and A steam-flow meter 9 and B steam-flow meter 11 are shown normally；2.3.8 it) checks and confirms double low pressure (LP) cylinder vapour
The parameters such as the vibration of turbine ontology, Wa Wen, axial displacement, swollen poor, cylinder temperature are shown normally；2.3.9 A low pressure (LP) cylinder and B low pressure) are suitably reduced
The shaft seal steam temperature (such as to 130-140 DEG C) of cylinder suitably reduces the swollen difference of low pressure (LP) cylinder in advance.
(3) cylinder operating condition is cut
(3.1) A low pressure (LP) cylinder zero power output operation: by deh control system adjust A butterfly valve 5, five sections of isolating valves 13 of A low pressure (LP) cylinder,
Six sections of isolating valves 14 of A low pressure (LP) cylinder and B regulating valve 8 are in close state, meanwhile, adjust five sections of B butterfly valve 6, B low pressure (LP) cylinder isolating valves
15, six sections of isolating valves 16 of B low pressure (LP) cylinder and A regulating valve 7 are in the open state, and specific rate-determining steps are as follows:
(3.1.1) is when the high pressure cylinder throttle flow of double low pressure (LP) cylinder steam turbines reaches the throttle flow of requirement (as being not less than 50%
Rated steam inlet amount), allow to execute the power output operation of A low pressure (LP) cylinder zero；Preferably, in the present embodiment, first by high pressure cylinder before cutting cylinder
Throttle flow is down to about 50% rated steam inlet amount, then executes the power output operation of A low pressure (LP) cylinder zero, and cutting can be by increasing high pressure cylinder after cylinder is put into
Throttle flow is to further increase heating steam extraction amount；
(3.1.2) looks over one's shoulder oxygen-eliminating device pressure and water level and condenser water level, observe A low pressure (LP) cylinder exhaust stage blade and
The temperature of second last stage blade, every monitoring data should be in normal range (NR)；
Five sections of isolating valves 13 of A low pressure (LP) cylinder and six sections of steam extractions on five sections of suction branch of (3.1.3) slowly closing A low pressure (LP) cylinder
Six sections of isolating valves 14 of A low pressure (LP) cylinder on branch pipe check the pumping on the five sections of suction branch and six sections of suction branch of confirmation A low pressure (LP) cylinder
Drain valve is closed before vapour to low plus non-return valve；
(3.1.4) checks that the spray desuperheating system of confirmation A low pressure (LP) cylinder is normally-open, and according to the exhaust temperature of A low pressure (LP) cylinder
It is adjusted；
The aperture of (3.1.5) adjustment A butterfly valve 5 is reduced to about 20%, confirms that the initial steam pressure of A low pressure (LP) cylinder is minimum what is required
Steam extraction quick closing valve valve opening near pressure value, and on synchronous adjustment heat supply bleed steam pipework；
The aperture quick closing valve of A butterfly valve 5 to 0, quick closedown time < 20s are synchronized out big hot bleed steam pipework by (3.1.6)
On steam extraction fast valve；
(3.1.7) gradually opens A spray desuperheating system 10, makes gradually to drop into temperature in the bypass duct of A low pressure (LP) cylinder
150 DEG C, it should be noted that temperature rise/temperature drop rate avoids generating larger thermal shock to low pressure flow passage component；Start spray desuperheating system simultaneously
The air intake temperature T3 for monitoring air intake temperature T2 and the B low pressure (LP) cylinder of steam drain temperature T1, the A low pressure (LP) cylinder of intermediate pressure cylinder, should meet:
T1-T2 > 50 DEG C, T1-T3 > 50 DEG C；
(3.1.8) is shown under normal circumstances in each parameter of double low pressure (LP) cylinder steam turbines, can using following two mode come
Adjust the heating steam extraction amount of heat supply bleed steam pipework:
(a) aperture of B butterfly valve 6 is gradually reduced, and synchronous adjustment steam extraction quick closing valve valve opening keeps heating extraction pressure to stablize,
Until heating steam extraction amount reaches maximum, each valve on heat supply bleed steam pipework is to standard-sized sheet；It cuts cylinder and occurs pressure oscillation in the process
It can be by adjusting the aperture of B butterfly valve 6, to keep the pressure of heat supply bleed steam pipework to stablize.If above-mentioned measure cannot be such that heat supply takes out
The pressure (exhaust steam pressure of intermediate pressure cylinder) of vapor pipeline is restored to normal operation range, then needs quickly to open the shape to before testing of A butterfly valve 5
State, until the pressure recovery of heat supply bleed steam pipework is to normal operation range.
(b) it is stepped up boiler load, and synchronous adjustment steam extraction quick closing valve valve opening keeps heating extraction pressure to stablize, until
Heating steam extraction amount reaches maximum, and each valve on heat supply bleed steam pipework is to standard-sized sheet；It cuts during cylinder and pressure oscillation occurs and can lead to
Crossing add drop boiler load or heat supply network recirculated water supply water temperature, (wherein, the rate of add drop thermic load is generally no greater than 4~5t/
Min), to keep the stabilization of heating extraction pressure.If above-mentioned measure cannot make heating extraction pressure (the steam discharge pressure of intermediate pressure cylinder
Power) restore to normal operation range, then need quickly to open A butterfly valve 5 to original state, until the pressure recovery of heat supply bleed steam pipework
To normal operation range.
Preferably, the condensed water of the heat supply bleed steam pipework should be recycled and is supplemented, to prevent heating steam extraction from condensing
The leakage and pollution of water.
(3.2) B low pressure (LP) cylinder zero power output operation: by deh control system adjust B butterfly valve 6, five sections of isolating valves 15 of B low pressure (LP) cylinder,
Six sections of isolating valves 16 of B low pressure (LP) cylinder and A regulating valve 7 are in close state, meanwhile, adjust five sections of A butterfly valve 5, A low pressure (LP) cylinder isolating valves
13, six sections of isolating valves 14 of A low pressure (LP) cylinder and B regulating valve 8 are in the open state；Its specific rate-determining steps can refer to A low pressure (LP) cylinder zero and go out
Power operation, details are not described herein again.
(3.3) the double power output of low pressure (LP) cylinder zero operations: A low pressure (LP) cylinder excision movement is run by deh control system and B low pressure (LP) cylinder is cut
Except movement, wherein A low pressure (LP) cylinder excision movement are as follows: adjustment A butterfly valve 5, five sections of isolating valves 13 of A low pressure (LP) cylinder and six sections of A low pressure (LP) cylinder isolation
A regulating valve 7, B low pressure (LP) cylinder excision movement are closed and opened to valve 14 are as follows: five sections of adjustment B butterfly valve 6, B low pressure (LP) cylinder isolating valves 15 are low with B
Six sections of isolating valves 16 of cylinder pressure, which are closed, simultaneously opens B regulating valve 8, when executing the double power output of low pressure (LP) cylinders zero operations, there are two types of control mode,
A low pressure (LP) cylinder excision movement is synchronous with B low pressure (LP) cylinder excision movement in by described in (3) executes, or first carries out the excision of A low pressure (LP) cylinder and move
Make, then execute B low pressure (LP) cylinder excision movement, completes the switching contributed to double low pressure (LP) cylinders zero in such a way that substep executes.
It is specific as follows by taking the synchronous specific rate-determining steps executed as an example:
(3.3.1) is when the high pressure cylinder throttle flow of double low pressure (LP) cylinder steam turbines reaches the throttle flow of requirement (as being not less than 50%
Rated steam inlet amount), allow to execute the double power output of low pressure (LP) cylinder zero operations；Preferably, in the present embodiment, first by high pressure cylinder before cutting cylinder
Throttle flow is down to about 50% rated steam inlet amount, then executes the double power output of low pressure (LP) cylinder zero operations, and cutting can be by increasing high pressure after cylinder is put into
Cylinder throttle flow is to further increase heating steam extraction amount；
(3.3.2) looks over one's shoulder oxygen-eliminating device pressure and water level and condenser water level, observes the final stage leaf of A low pressure (LP) cylinder respectively
The temperature of the temperature of piece and second last stage blade, the exhaust stage blade of B low pressure (LP) cylinder and second last stage blade, every monitoring data should be at just
In normal range；
Five sections of isolating valves 13 of A low pressure (LP) cylinder and six sections of steam extractions on five sections of suction branch of (3.3.3) slowly closing A low pressure (LP) cylinder
Six sections of isolating valves 14 of A low pressure (LP) cylinder on branch pipe check the pumping on the five sections of suction branch and six sections of suction branch of confirmation A low pressure (LP) cylinder
Drain valve is closed before vapour to low plus non-return valve；Meanwhile five sections of B low pressure (LP) cylinder on five sections of suction branch of slowly closing B low pressure (LP) cylinder
Six sections of isolating valves 16 of B low pressure (LP) cylinder on isolating valve 15 and six sections of suction branch, check confirmation B low pressure (LP) cylinder five sections of suction branch and
Drain valve is closed before steam extraction to low plus non-return valve on six sections of suction branch；
(3.3.4) checks that the spray desuperheating system of confirmation A low pressure (LP) cylinder and B low pressure (LP) cylinder is normally-open, and according to A low pressure (LP) cylinder and
The exhaust temperature (respectively by temperature sensor t3 temperature collection data before temperature sensor t2 and B before A) of B low pressure (LP) cylinder is adjusted
The spray desuperheating system opening degree；
The aperture of (3.3.5) adjustment A butterfly valve 5 and B butterfly valve 6 is reduced to about 20%, confirms A low pressure (LP) cylinder and B low pressure (LP) cylinder
Initial steam pressure near desired minimal pressure force value (respectively by A after after pressure sensor p4 and B pressure sensor p5 acquire pressure
Data), and the steam extraction quick closing valve valve opening on synchronous adjustment heat supply bleed steam pipework；
(3.3.6) is synchronous by the aperture quick closing valve of A butterfly valve 5 and B butterfly valve 6 to 0, quick closedown time < 20s, and synchronizes out
Steam extraction fast valve on big hot bleed steam pipework；
(3.3.7) is synchronous gradually to open A spray desuperheating system 10 and B spray desuperheating system 12, makes A low pressure (LP) cylinder and B low pressure
Cooling steam temperature gradually drops to 150 DEG C in bypass duct corresponding to cylinder, it should be noted that temperature rise/temperature drop rate is avoided to low pressure
Passage component generates larger thermal shock；Start A spray desuperheating system 10 and B spray desuperheating system 12 and the steam discharge for monitoring intermediate pressure cylinder
Air intake temperature T2 and the B low pressure (LP) cylinder of mouthful temperature T1, A low pressure (LP) cylinder air intake temperature T3 (respectively by temperature sensor t4 after A and
Temperature sensor t5 is acquired temperature information after B), it should meet: T1-T2 > 50 DEG C, T1-T3 > 50 DEG C；
(3.3.8) is shown under normal circumstances in each parameter of double low pressure (LP) cylinder steam turbines, can using following two mode come
Adjust the heating steam extraction amount of heat supply bleed steam pipework:
(a) it is stepped up boiler load, and synchronous adjustment steam extraction quick closing valve valve opening keeps heating extraction pressure to stablize, until
Heating steam extraction amount reaches maximum, and each valve on heat supply bleed steam pipework is to standard-sized sheet；It cuts during cylinder and pressure oscillation occurs and can lead to
Crossing add drop boiler load or heat supply network recirculated water supply water temperature, (wherein, the rate of add drop thermic load is generally no greater than 4~5t/
Min), to keep the stabilization of heating extraction pressure.If above-mentioned measure cannot make heating extraction pressure (the steam discharge pressure of intermediate pressure cylinder
Power) restore to normal operation range, then need quickly to open A butterfly valve 5 and B butterfly valve 6 to original state, up to heat supply bleed steam pipework
Pressure recovery is to normal operation range.
Preferably, the condensed water of the heat supply bleed steam pipework should be recycled and is supplemented, to prevent heating steam extraction from condensing
The leakage and pollution of water.
Embodiment 2
The stable operation that double low pressure (LP) cylinder steam turbines are promoted for progress also discloses a kind of double low on the basis of embodiment 1
The guard method that cylinder pressure turbine low pressure cylinder zero is contributed, the guard method are based on above-mentioned double low pressure (LP) cylinder turbine low pressure cylinders zero and contribute
Control method comprising:
(1) the steam drain pressure P1 (being detected by middle row pressure force snesor p1) for monitoring intermediate pressure cylinder, if pressure P1 is greater than
Predetermined value, then feedback signal to deh control system, deh control system individually or simultaneously adjust the aperture of A butterfly valve 5 and B butterfly valve 6；
Specific step is as follows:
(1.1) the steam drain pressure P1 of intermediate pressure cylinder is in level-one early warning
1) if the double power outputs of low pressure (LP) cylinders zero of execution run lower heat supply bleed steam pipeworks progress heating extraction for heat supply, and A water spray subtracts
Warm system 10 and B spray desuperheating system 12 are not put under operating condition, are opened A butterfly valve 5 and B butterfly valve 6 and are cut to minimum aperture with exiting
Double low pressure (LP) cylinder operating conditions；
If 2) execute the power output operation of A low pressure (LP) cylinder zero, heat supply bleed steam pipework carries out heating extraction for heat supply, increases B low pressure (LP) cylinder
On 6 aperture of B butterfly valve, if B butterfly valve 6 has reached maximum opening, pressure is also high, need to exit A low pressure (LP) cylinder zero contribute operating condition (in A
Spray desuperheating system 10, which is not put under operating condition, opens A butterfly valve 5 to minimum aperture)；Guarantor when executing the power output operation of B low pressure (LP) cylinder zero
Maintaining method is similar, and details are not described herein again；
If 3) cut cylinder heating extraction for heat supply operating condition routinely non-, big A butterfly valve 5 and B butterfly valve 6 or adjustment heat supply bleed steam pipework are opened
On steam extraction quick closing valve valve opening, or increase heat supply bleed steam pipework heating steam extraction amount, reduce unit load.
(1.2) the steam drain pressure P1 of intermediate pressure cylinder is in second level early warning
Safety valve 1 on heat supply bleed steam pipework is switched to breakdown action, and A butterfly valve 5 and B butterfly valve 6 switch to full-gear.
(2) three sections of suction branch pressure P2 of intermediate pressure cylinder are monitored and calculate the pressure difference between pressure P2 and pressure P1, if pressure
Difference is greater than predetermined value, then feedback signal to deh control system, and deh control system adjusts A butterfly valve 5, B butterfly valve 6 or the electronic pass of steam extraction
The aperture of disconnected valve, the specific steps are as follows:
(2.1) if differential pressure is in level-one early warning
If 1) be in the non-steam extraction fast valve cut cylinder operating condition, turn down on heat supply bleed steam pipework；
If 2) in double low pressure (LP) cylinder operating conditions are cut, using the steam extraction fast valve turned down on heat supply bleed steam pipework；
If 3) single low pressure (LP) cylinder cuts off operating condition, turns down normally-open butterfly valve (A butterfly valve 5 or B butterfly valve 6) or turn down heat supply pumping
Steam extraction fast valve on vapor pipeline；
4) by the way of reducing main vapour throttle flow or reheating vapour throttle flow.
(2.2) if differential pressure is in second level early warning
Further decrease main vapour throttle flow or reheating vapour throttle flow.
(3) the steam drain temperature T1 for monitoring intermediate pressure cylinder (is detected by middle row's temperature sensor t1, and is fed back to DEH control
System processed), if temperature T1 is greater than predetermined value, feedback signal to deh control system reduces intermediate pressure cylinder by deh control system
Exhaust steam pressure, adjustment A butterfly valve 5 or B butterfly valve 6 aperture；
Described if (3) are in the double power output of low pressure (LP) cylinders zero operations, and temperature T1 is greater than predetermined value, then is by DEH control
System reduces the exhaust steam pressure of intermediate pressure cylinder or opens A butterfly valve 5 and B butterfly valve 6 simultaneously, and steps are as follows for specific protection:
1) the steam drain temperature T1 of intermediate pressure cylinder is in level-one early warning, pays close attention to the exhaust temperature variation tendency of intermediate pressure cylinder,
And heating extraction pressure is reduced by increasing the steam extraction quick closing valve valve opening on heat supply bleed steam pipework or reducing boiler load, in turn
Reduce the exhaust temperature of intermediate pressure cylinder；
2) the steam drain temperature T1 of intermediate pressure cylinder is in second level early warning, exits the heating extraction for heat supply work that double low pressure (LP) cylinders zero are contributed
Condition opens A butterfly valve 5 and B butterfly valve 6 (more than butterfly valve minimum aperture), restore A low pressure (LP) cylinder and B low pressure (LP) cylinder into vapour, to press in maintaining
The exhaust temperature of cylinder is in normal operation range；
3) the steam drain temperature T1 of intermediate pressure cylinder, which is in, shuts down early warning, and A butterfly valve 5 and B butterfly valve 6 standard-sized sheet, then directly stops
Machine.
Described if (3) are in the power output operation of A low pressure (LP) cylinder zero, and temperature T1 is greater than predetermined value, then passes through deh control system
It reduces the exhaust steam pressure of intermediate pressure cylinder or opens A butterfly valve 5, specific guard method is as follows:
1) the steam drain temperature T1 of intermediate pressure cylinder is in level-one early warning, pays close attention to the exhaust temperature variation tendency of intermediate pressure cylinder,
And by increasing the steam extraction quick closing valve valve opening on heat supply bleed steam pipework or adjusting the aperture of B butterfly valve 6, and then reduce intermediate pressure cylinder
Exhaust temperature；
2) the steam drain temperature T1 of intermediate pressure cylinder is in second level early warning, exits the power output operating condition of A low pressure (LP) cylinder zero, opens A butterfly
Valve 5 restores the A low pressure (LP) cylinder of excision into vapour, to maintain the exhaust temperature of intermediate pressure cylinder in normal operation range；
3) the steam drain temperature T1 of intermediate pressure cylinder, which is in, shuts down early warning, and the standard-sized sheet of A butterfly valve 5, then directly shutdown.
When described (3) are in the power output operation of B low pressure (LP) cylinder zero, and temperature T1 is greater than predetermined value, then is dropped by deh control system
The exhaust steam pressure of low intermediate pressure cylinder opens B butterfly valve 6, when specific guard method is referring to the above-mentioned power output operation in A low pressure (LP) cylinder zero
, details are not described herein again.
(4) the swollen difference of low pressure (LP) cylinder is monitored, if the swollen difference of low pressure (LP) cylinder is greater than preset value and the A low pressure (LP) cylinder zero power output operation, is led to
Cross the aperture of deh control system adjustment A butterfly valve 5；If difference that low pressure (LP) cylinder is swollen is greater than preset value and the B low pressure (LP) cylinder zero power output operation
When, the aperture of B butterfly valve 6 is adjusted by deh control system；
(5) if execute the power output of A low pressure (LP) cylinder zero operation, the second last stage blade temperature T4 and final stage of A low pressure (LP) cylinder are monitored
Leaf temperature T5 is (respectively by the right left final stage of second last stage blade temperature sensor t7, A of left second last stage blade temperature sensor t6, the A of A
The right exhaust stage blade temperature sensor t11 of leaf temperature sensor t10 and A acquires data), it is preset if temperature T4 or temperature T5 is greater than
Value then adjusts the spray desuperheating system or open A butterfly valve 5 that corresponding bypass channel is arranged by deh control system, specific to protect
Method is as follows:
(5.1) if the exhaust stage blade temperature T5 of A low pressure (LP) cylinder
1) the A spray desuperheating system 10 of A low pressure (LP) cylinder is opened in the excessively high level-one early warning of exhaust stage blade temperature T5；
2) the A spray desuperheating system 10 of the excessively high second level early warning of exhaust stage blade temperature T5, A low pressure (LP) cylinder is adjusted to greatest extent；
3) the power output operation of A low pressure (LP) cylinder zero is exited in the excessively high three-level early warning of exhaust stage blade temperature T5, and opening A butterfly valve 5, (butterfly valve is most
It is more than small guide vane), restore A low pressure (LP) cylinder into vapour；
4) the excessively high level Four early warning of exhaust stage blade temperature T5 is shut down.
(5.2) if the second last stage blade temperature T4 of A low pressure (LP) cylinder
1) the excessively high level-one alarm of second last stage blade temperature T4, by improving low pressure (LP) cylinder steam discharge desuperheating water pitch aperture and condensation
Water pump discharge pressure increases low pressure (LP) cylinder steam discharge attemperation water flow, and suitably increases low pressure (LP) cylinder cooling steam bypass valve aperture,
Low pressure (LP) cylinder cooling steam bypass flow is improved, until temperature restores normal level after low pressure (LP) cylinder penult movable vane；
2) the excessively high secondary alarm of second last stage blade temperature T4 exits the power output operation of A low pressure (LP) cylinder zero, opens 5 (butterfly valve of A butterfly valve
It is more than minimum aperture), restore A low pressure (LP) cylinder into vapour；
3) the excessively high three-level alarm of second last stage blade temperature T4, shuts down.
If execute the power output of B low pressure (LP) cylinder zero operation, the second last stage blade temperature T6 and exhaust stage blade of B low pressure (LP) cylinder are monitored
Temperature T7 is (respectively by the right left exhaust stage blade of second last stage blade temperature sensor t9, B of left second last stage blade temperature sensor t8, the B of B
The right exhaust stage blade temperature sensor t13 of temperature sensor t12 and B acquires data), if temperature T6 or temperature T7 is greater than preset value,
The spray desuperheating system or open B butterfly valve 6 that corresponding bypass channel is arranged, specific protection side are then adjusted by deh control system
Method can refer to the power output operating condition of A low pressure (LP) cylinder zero, and details are not described herein again.
In the present embodiment, if execute the power output of A low pressure (LP) cylinder zero operation, B low pressure (LP) cylinder is not more than into steam flow amount
30t/h；If execute the power output of B low pressure (LP) cylinder zero operation, A low pressure (LP) cylinder is not more than 30t/h into steam flow amount.
In the present embodiment, it when heat supply bleed steam pipework is in normal heating, is pressed after the valve of A butterfly valve 5 and B butterfly valve 6
Power (acquiring pressure data information by pressure sensor p3 before pressure sensor p2 and B before A respectively) is not less than desired minimum
(such as 0.25MPa), to guarantee to be enough cooling flow by A low pressure (LP) cylinder and B low pressure (LP) cylinder, it is ensured that the exhaust stage blade of low pressure (LP) cylinder and time
Exhaust stage blade safe operation.
The present invention is not limited to above-mentioned optional embodiment, anyone can show that other are various under the inspiration of the present invention
The product of form, however, make any variation in its shape or structure, it is all to fall into the claims in the present invention confining spectrum
Technical solution, be within the scope of the present invention.
Claims (10)
1. a kind of control method that double low pressure (LP) cylinder turbine low pressure cylinders zero are contributed, including the high pressure being set in double low pressure (LP) cylinder steam turbines
Cylinder, intermediate pressure cylinder, A low pressure (LP) cylinder, B low pressure (LP) cylinder and deh control system, which is characterized in that the control method includes: (1) by intermediate pressure cylinder
Steam drain the air intake of A low pressure (LP) cylinder and B low pressure (LP) cylinder is respectively communicated to through main pipeline, and A butterfly is respectively equipped on each main pipeline
Valve and B butterfly valve；The steam drain of intermediate pressure cylinder is respectively communicated to the air intake of A low pressure (LP) cylinder and B low pressure (LP) cylinder through bypass duct, and each
A regulating valve and B regulating valve are respectively equipped on bypass duct；
Five sections of isolating valves of A low pressure (LP) cylinder and five sections of B low pressure (LP) cylinder will be respectively equipped on five sections of suction branch of A low pressure (LP) cylinder and B low pressure (LP) cylinder
The two is simultaneously connected to by isolating valve；Six sections of A low pressure (LP) cylinder isolation will be respectively equipped on six sections of suction branch of A low pressure (LP) cylinder and B low pressure (LP) cylinder
The two is simultaneously connected to by valve and six sections of isolating valves of B low pressure (LP) cylinder；
Heat supply bleed steam pipework is connected on the steam drain of medium pressure cylinder, heat supply bleed steam pipework is equipped with safety valve, steam extraction stops
Return valve, steam extraction fast valve and the electronic shut-off valve of steam extraction；
(2) it reviews and validate every operating parameter and is in normal condition；
(3) A butterfly valve, five sections of isolating valves of A low pressure (LP) cylinder, A low pressure (LP) cylinder six power output of A low pressure (LP) cylinder zero operation: are adjusted by deh control system
Section isolating valve and B regulating valve are in close state, meanwhile, adjustment B butterfly valve, five sections of isolating valves of B low pressure (LP) cylinder, six sections of B low pressure (LP) cylinder every
It is in the open state from valve and A regulating valve；
The power output operation of B low pressure (LP) cylinder zero: B butterfly valve, five sections of isolating valves of B low pressure (LP) cylinder, six sections of B low pressure (LP) cylinder are adjusted by deh control system
Isolating valve and A regulating valve are in close state, meanwhile, adjustment A butterfly valve, five sections of isolating valves of A low pressure (LP) cylinder, six sections of A low pressure (LP) cylinder isolation
Valve and B regulating valve are in the open state；
The double power output of low pressure (LP) cylinder zero operations: running A low pressure (LP) cylinder excision movement by deh control system and the excision of B low pressure (LP) cylinder act,
In, A low pressure (LP) cylinder excision movement are as follows: six sections of adjustment A butterfly valve, five sections of isolating valves of A low pressure (LP) cylinder and A low pressure (LP) cylinder isolating valves are closed and opened
A regulating valve, B low pressure (LP) cylinder excision movement are as follows: six sections of adjustment B butterfly valve, five sections of isolating valves of B low pressure (LP) cylinder and B low pressure (LP) cylinder isolating valves are closed
And open B regulating valve.
2. the control method that double low pressure (LP) cylinder turbine low pressure cylinders zero according to claim 1 are contributed, which is characterized in that described
(3) A low pressure (LP) cylinder excision movement execution synchronous with B low pressure (LP) cylinder excision movement or substep execute in.
3. the control method that double low pressure (LP) cylinder turbine low pressure cylinders zero according to claim 1 are contributed, which is characterized in that described
In the power output operation of A low pressure (LP) cylinder zero, the aperture for first passing through deh control system adjustment A butterfly valve is 19%-21%, then opening A butterfly valve
Quick closedown is spent to 0, and the quick closedown time is less than 20s；
In the B low pressure (LP) cylinder zero power output operation, the aperture for first passing through deh control system adjustment B butterfly valve is 19%-21%, then by B
The aperture quick closedown of butterfly valve is to 0, and the quick closedown time is less than 20s；
In double low pressure (LP) cylinders zero power output operation, opening for synchronous deh control system or substep adjustment A butterfly valve and B butterfly valve is first passed through
Degree is 19%-21%, then by A butterfly valve is synchronous with the aperture of B butterfly valve or substep quick closedown is to 0, and the quick closedown time is less than
20s。
4. the control method that double low pressure (LP) cylinder turbine low pressure cylinders zero according to claim 1 are contributed, which is characterized in that each institute
It states on bypass channel equipped with the spray desuperheating system cooling to its steam inside, starts spray desuperheating system and monitor intermediate pressure cylinder
The air intake temperature T3 of air intake temperature T2 and the B low pressure (LP) cylinder of steam drain temperature T1, A low pressure (LP) cylinder, should meet: T1-T2 > 50 DEG C,
T1-T3>50℃。
5. the control method that double low pressure (LP) cylinder turbine low pressure cylinders zero according to claim 1 are contributed, which is characterized in that holding
Before the row power output of A low pressure (LP) cylinder zero operation, the operation of the power output of B low pressure (LP) cylinder zero and the power output operation of double low pressure (LP) cylinders zero, it should reduce
The throttle flow of the high pressure cylinder to its rated steam inlet amount 45%-55%.
6. the control method that double low pressure (LP) cylinder turbine low pressure cylinders zero according to claim 1 are contributed, which is characterized in that execute
It is both needed to described in synchronous adjustment when the power output of A low pressure (LP) cylinder zero operation, the operation of the power output of B low pressure (LP) cylinder zero and the power output operation of double low pressure (LP) cylinders zero
The aperture of steam extraction fast valve.
7. the control method that double low pressure (LP) cylinder turbine low pressure cylinders zero according to claim 1 are contributed, which is characterized in that execute
When the power output of A low pressure (LP) cylinder zero operation, the operation of the power output of B low pressure (LP) cylinder zero and the power output operation of double low pressure (LP) cylinders zero, to the heat supply steam extraction
The condensed water of pipeline is recycled and is supplemented.
8. a kind of guard method that double low pressure (LP) cylinder turbine low pressure cylinders zero are contributed, which is characterized in that the guard method is applied to power
Benefit requires the control method that double low pressure (LP) cylinder turbine low pressure cylinders zero are contributed described in 1-7 any one comprising:
(1) monitor intermediate pressure cylinder steam drain pressure P1, if pressure P1 be greater than predetermined value, feedback signal to deh control system,
Deh control system individually or simultaneously adjusts the aperture of A butterfly valve and B butterfly valve；
(2) three sections of suction branch pressure P2 of intermediate pressure cylinder are monitored and calculate the pressure difference between pressure P2 and pressure P1, if pressure difference is big
In predetermined value, then feedback signal to deh control system, deh control system adjust A butterfly valve, B butterfly valve or the electronic shut-off valve of steam extraction
Aperture；
(3) the steam drain temperature T1 of intermediate pressure cylinder is monitored, if temperature T1 is greater than predetermined value, feedback signal to deh control system is led to
Crossing deh control system reduces the aperture of the exhaust steam pressure of intermediate pressure cylinder, adjustment A butterfly valve or B butterfly valve；
(4) the swollen difference of low pressure (LP) cylinder is monitored, if the swollen difference of low pressure (LP) cylinder is greater than preset value and the A low pressure (LP) cylinder zero power output operation, passes through DEH
The aperture of control system adjustment A butterfly valve；If difference that low pressure (LP) cylinder is swollen is greater than preset value and the B low pressure (LP) cylinder zero power output operation, pass through
The aperture of deh control system adjustment B butterfly valve；
(5) if execute the power output of A low pressure (LP) cylinder zero operation, the second last stage blade temperature T4 and exhaust stage blade of A low pressure (LP) cylinder are monitored
Temperature T5 adjusts the water spray that corresponding bypass channel is arranged by deh control system if temperature T4 or temperature T5 is greater than preset value
Temperature reducing system opens A butterfly valve；
If execute the power output of B low pressure (LP) cylinder zero operation, the second last stage blade temperature T6 and exhaust stage blade temperature of B low pressure (LP) cylinder are monitored
T7 adjusts the spray desuperheating that corresponding bypass channel is arranged by deh control system if temperature T6 or temperature T7 is greater than preset value
System opens B butterfly valve.
9. the guard method that double low pressure (LP) cylinder turbine low pressure cylinders zero according to claim 8 are contributed, which is characterized in that if holding
When the row power output of A low pressure (LP) cylinder zero is run, B low pressure (LP) cylinder is not more than 30t/h into steam flow amount；If executing the B low pressure (LP) cylinder zero to go out
When power is run, A low pressure (LP) cylinder is not more than 30t/h into steam flow amount.
10. the guard method that double low pressure (LP) cylinder turbine low pressure cylinders zero according to claim 8 are contributed, which is characterized in that if
When described (3) are in the double power output of low pressure (LP) cylinders zero operations, and temperature T1 is greater than predetermined value, then by pressing in deh control system reduction
The exhaust steam pressure of cylinder opens A butterfly valve and B butterfly valve simultaneously；
Described if (3) are in the power output operation of A low pressure (LP) cylinder zero, and temperature T1 is greater than predetermined value, then is reduced by deh control system
The exhaust steam pressure of intermediate pressure cylinder opens A butterfly valve；
When described (3) are in the power output operation of B low pressure (LP) cylinder zero, and temperature T1 is greater than predetermined value, then by deh control system reduction
The exhaust steam pressure of cylinder pressure opens B butterfly valve.
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| CN201910567321.2A CN110219707B (en) | 2019-06-27 | 2019-06-27 | Control and protection method for zero output of low pressure cylinder of double-low pressure cylinder steam turbine |
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| CN113404563B (en) * | 2021-06-18 | 2022-08-02 | 东方电气集团东方汽轮机有限公司 | Low-pressure cylinder cutting heat supply unit low-heating and back-heating system |
| CN113404563A (en) * | 2021-06-18 | 2021-09-17 | 东方电气集团东方汽轮机有限公司 | Low-pressure cylinder cutting heat supply unit low-heating and back-heating system |
| CN114112411B (en) * | 2021-10-30 | 2023-09-08 | 国家能源集团华北电力有限公司廊坊热电厂 | Steam turbine shaft seal system state monitoring system and method |
| CN114112411A (en) * | 2021-10-30 | 2022-03-01 | 国家能源集团华北电力有限公司廊坊热电厂 | Steam turbine shaft seal system state monitoring system and method |
| CN114198802B (en) * | 2021-12-13 | 2022-12-27 | 西安热工研究院有限公司 | Heating system and method of low-pressure cylinder zero-output coupling absorption heat pump |
| CN114198802A (en) * | 2021-12-13 | 2022-03-18 | 西安热工研究院有限公司 | Heating system and method of low-pressure cylinder zero-output coupling absorption heat pump |
| CN114483235A (en) * | 2021-12-28 | 2022-05-13 | 杭州华电能源工程有限公司 | Heating system for switching pumping condensation into low-pressure cylinder with zero output and working method thereof |
| CN114483235B (en) * | 2021-12-28 | 2023-09-15 | 杭州华电能源工程有限公司 | Heat supply system switched from extraction and condensation to zero output of low-pressure cylinder and working method thereof |
| CN114704340A (en) * | 2022-05-06 | 2022-07-05 | 中国船舶重工集团公司第七0三研究所 | Double-low-pressure-cylinder zero-output steam turbine set regenerative system and operation method |
| CN114704340B (en) * | 2022-05-06 | 2023-12-08 | 中国船舶重工集团公司第七0三研究所 | Double-low-pressure cylinder zero-output steam turbine unit regenerative system and operation method |
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