CN206545526U - A kind of steam turbine variable pressure operation control set for adjusting - Google Patents
A kind of steam turbine variable pressure operation control set for adjusting Download PDFInfo
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- CN206545526U CN206545526U CN201720222642.5U CN201720222642U CN206545526U CN 206545526 U CN206545526 U CN 206545526U CN 201720222642 U CN201720222642 U CN 201720222642U CN 206545526 U CN206545526 U CN 206545526U
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Abstract
The utility model is related to power field, more particularly to a kind of steam turbine variable pressure operation control set for adjusting, including initial steam source, servomotor, steam turbine and generator, the initial steam source connects the input of steam turbine by jet chimney by main inlet throttle-stop valve valve and inlet valve, the servomotor controls the inlet valve of steam turbine, the Steam Turbine Driven generator acting generates electricity, also include control device, the control device includes control module, measurement module, jet chimney and steam turbine after the measurement module connection main inlet throttle-stop valve, for measuring main steam condition and steam turbine operation parameter, the control module connects servomotor, for being controlled to inlet valve valve position.The beneficial effects of the utility model are：Steam energy is made full use of, unnecessary steam energy is stored by steam heat storage device；Ensure steam turbine operation in the pressure limit of safety, by steam heat storage device heat release with supplement steam can deficiency；Turbine admission valve restriction loss is minimum, and performance driving economy is high.
Description
Technical field
The present invention relates to power field, more particularly to a kind of steam turbine variable pressure operation control set for adjusting.
Background technology
Current Generator Set (such as rated power 150MW and more than) all uses " the electric cam institution of distributing gas ", i.e.,
Each inlet valve can realize that " sequence valve " is controlled using a servomotor control by control system, by taking 4 inlet valves as an example,
1,4 valves can first be opened, 3 valves are then turned on, the 4th valve is finally opened, so than and meanwhile 4 valves of unlatching to enter vapour restriction loss small very
It is many.This kind of unit steam admission mode can be changed by control system and selected, and typically all use " unit style " method of operation, i.e.,
The stove of one machine one is run, and steam inlet condition is stablized relatively, the general long-term operation under declared working condition.
It is dynamic using an oil all using the mechanical institution of distributing gas small power generation unit (if rated power is in below 50MW)
Machine controls several inlet valves simultaneously, and inlet valve opening sequence is fixed by mechanical structure, mainly carries board-like and mechanical cam and matches somebody with somebody vapour
Two kinds of forms, servomotor opens inlet valve by lever or cam by permanent order.
There is substantial amounts of heat energy in industries such as petrochemical industry chemical industry, metallurgical and building materials can recycle, most of with steam energy
Based on recycling, mainly there are two kinds to utilize form, a kind of is that certain pressure and the steam of temperature directly are introduced into steam turbine
Acting (or entering other devices using steam energy, not in present invention description)；Another produced necessarily by waste heat boiler
The steam of pressure and temperature is re-introduced into steam turbine acting.This kind of steam turbine power is typically little, and (such as rated power is in 50MW
Following small power generation unit).
It can utilize site of deployment, because upstream operating mode is unstable, cause steam turbine steam inlet condition to change in above-mentioned steam
It is very big, steam turbine is run under off-design behaviour, efficiency reduction can damage unit when serious.
The generating set that can be utilized for this kind of small steam, mainly there is three kinds of control methods at present：Constant DP control, determine work(
Rate control and sliding pressure control etc..
(1) constant DP control method refers to set before steam turbine steam pressure as definite value, when steam pressure is higher than setting value,
Big turbine governor valve is opened, makes to increase into steam flow amount, to reduce steam pressure to setting value；When steam pressure is less than setting value
When, turbine governor valve is turned down, makes to reduce into steam flow amount, to improve steam pressure to setting value.Constant DP control can make steam turbine
Initial steam pressure relatively stablize, but when throttle flow change greatly and it is unstable when, enter vapour restriction loss larger.
(2) constant dc power control method refers to set generated output as definite value, when actual power is less than setting value, opens big vapour
Turbine regulating valve, makes to increase into steam flow amount, to improve generated output to setting value；When actual power is more than setting value, then close
Small turbine regulating valve, makes to reduce into steam flow amount, to reduce generated output to setting value.Constant dc power control method only considered machine
The stabilization of group power output, it is larger on steam inlet condition change influence, so seldom being applied in steam energy UTILIZATION OF VESIDUAL HEAT IN occasion.
(3) sliding pressure operation control method is by turbine governor valve standard-sized sheet, it is ensured that steam turbine all enters vapour, and this method can
To make full use of the steam energy that process upstream is produced, but as process upstream changes, initial steam pressure is also continually changing, when entering vapour pressure
When power is less than the minimum safe initial steam pressure that steam turbine allows, Turbine Safety operation can be impacted.Sliding pressure operation is controlled
Can be more using applications in steam waste heat.
Above control method does not consider the optimized operation efficient point of unit.Therefore need to invent a kind of steam turbine and set non-
The control method run under meter operating mode, to reduce the restriction loss that steam turbine enters steam control valve, improves the economy of steam turbine operation
Property and security.
The content of the invention
For the shortcoming of such scheme, the present invention proposes that one kind can be carried effectively using steam energy (or accumulation of heat steam energy)
The economy of high steam turbine operation and the steam turbine variable pressure operation control set for adjusting of security.
The technical scheme is that：A kind of steam turbine variable pressure operation control set for adjusting, including initial steam source, servomotor,
Steam turbine and generator, the initial steam source connect the input of steam turbine by jet chimney by main inlet throttle-stop valve valve and inlet valve
End, the servomotor controls the inlet valve of steam turbine, and the Steam Turbine Driven generator acting generates electricity, in addition to control device,
The control device includes the jet chimney and steamer after control module, measurement module, the measurement module connection main inlet throttle-stop valve
Machine, for measuring main steam condition and steam turbine operation parameter, the control module connects servomotor, for inlet valve valve
Position is controlled.
It is preferred that, the control device also include ramp generator, comparator, keep module, ratio module, integrator,
Adder and subtracter, the ramp generator, comparator difference link control module input, the control module output
End is sequentially connected holding module, ratio module, integrator and servomotor, and the adder and subtracter connect control mould respectively
The output end of block output end, adder and subtracter connects servomotor respectively.
It is preferred that, in addition to steam heat storage device, the input of the steam heat storage device passes through that ventilating valve connection is new to steam
Source output terminal is played, the output end of steam heat storage device is sequentially connected exhaust steam valve and non-return valve, and the ventilating valve and exhaust steam valve connect
Connect control module.
The beneficial effects of the invention are as follows：As main vapour pressure P0More than steam turbine initial steam pressure ceiling value PHWhen, automatically control out
Big inlet valve, to make full use of steam energy, while storing unnecessary steam energy by steam heat storage device；As main vapour pressure P0It is small
In steam turbine initial steam pressure lower limit value PLWhen, automatically control and turn down inlet valve, to ensure pressure model of the steam turbine operation in safety
In enclosing, at the same by steam heat storage device heat release with supplement steam can deficiency；As main vapour pressure P0Enter vapour pressure between steam turbine
Power ceiling value PHWith lower limit value PLWhen, using variable-pressure operation mode, automatically control inlet valve gate valve position F to steam turbine specific power h most
Corresponding valve position setting value F when bigSet, so that turbine admission valve restriction loss is minimum, performance driving economy highest.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is the system structure diagram of the embodiment of the present invention；
Fig. 2 is the curve synoptic diagram between steam turbine specific power h and inlet valve gate valve position F in the embodiment of the present invention；
Fig. 3 is the workflow schematic diagram of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme is further described, but the present invention is not limited to these realities
Apply example.
Fig. 1 is the system structure diagram of the embodiment of the present invention, as shown in figure 1, a kind of steam turbine variable pressure operation regulation control
Device processed, including initial steam source 107, servomotor 104, steam turbine 101, generator 102, control device 105 and steam accumulation of heat
Device 106, the initial steam source connects the input of steam turbine by jet chimney by main inlet throttle-stop valve valve 111 and inlet valve 103
End, the servomotor controls the inlet valve of steam turbine, and the Steam Turbine Driven generator acting generates electricity, and the control device includes
Control module 201, measurement module 202, ramp generator 203, comparator 204, holding module 205, ratio module 206, integration
Device 207, adder 208 and subtracter 209, the control module connect servomotor, for being controlled to inlet valve valve position
Jet chimney and steam turbine after system, the measurement module connection main inlet throttle-stop valve, the ramp generator, comparator are connected respectively
Control module input, the control module output end is sequentially connected holding module, ratio module, integrator and servomotor,
It is dynamic that the output end of the adder and subtracter difference link control module output end, adder and subtracter connects oil respectively
Machine, the input of the steam heat storage device connects initial steam source output terminal, the output of steam heat storage device by ventilating valve 108
End is sequentially connected exhaust steam valve 109 and non-return valve 110, and the ventilating valve and exhaust steam valve are all connected with control module.
Measurement module is used to measure main steam condition and steam turbine operation parameter, and main steam condition includes Stream temperature degree
T0, main vapour pressure P0, main steam flow Q0, steam turbine operation parameter include generated output KW.
Steam turbine is run in relative efficiency peak, first have to detection and determine steam turbine relative efficiency, be defined below
Specific power h characterizes the relative efficiency of steam turbine：
Wherein, KW is generated output, and KWmax is maximum power generation, and Q is actual steam flow, and Qmax is maximum steam
Flow, f (P) is steam pressure correction function.Wherein generated output KW, main vapour pressure P0With steam flow Q all to be actual easy
The parameter of measurement.
Specific power h is bigger, shows that the power of unit throttle flow output is bigger, steam turbine relative efficiency is higher.Correspondingly lead to
Specific power h and steam turbine oil motivation stroke F corresponding relation can be determined by crossing many experiments, as shown in Fig. 2.When servomotor row
When journey F reaches the position for making inlet valve restriction loss minimum, specific power h value is maximum, at this moment the relative efficiency highest of steam turbine,
The position is inlet valve valve position setting value FSet。
The low setting value P of steam turbine initial steam pressureLWith the high setting value P of steam turbine initial steam pressureHAccording to steam turbine steam inlet condition model
Enclose to set.Comparator is by main steam pressure P0With PLAnd PHValue compares, by comparative result, determines three kinds of operation control models：
Variable-pressure operation control model (PL<P0<PH), pressure low limit control model (P0< PL), pressure height limitation control model (P0>
PH)。
As shown in figure 3, in variable-pressure operation control model, control module is by the valve position setting value after ramp generator
F’SetCompared with valve position feedback value Fpv, resulting deviation delta F is most oily at last by keeping module, ratio module, integrator
The F controls of motivation valve position navigate to target valve position setting value FSet.The effect of ramp generator is to prevent target valve position setting value FSet
Change is too fast, and turbine body can be impacted.Measurement module measures Stream temperature degree T respectively0, main vapour pressure P0, main steam flow
Q0, calculate obtain warm variability RT respectivelyT, buckling rate RTP, flow change rate RTQ, it is contemplated that, can be right when steam inlet condition rate of change is big
Turbine body is impacted, therefore sets warm variability RT respectivelyT, buckling rate RTP, flow change rate RTQLimits value a, b and
C, works as RTT>A, or RTP>B, or RTQ>During c, module is kept to keep actual valve position temporarily constant, when steam inlet condition rate of change is small
When limits value, keep releasing.Ratio module amplifying valve position deviation delta F outputs, control module can be set according to actual conditions
Proportionality coefficient, integrator accumulation valve position deviation delta F outputs, realizes the non differential regulation of control of valve position.During this, control module
Ventilating valve, exhaust steam valve is controlled to close.
In pressure height limitation control model, as main vapour pressure P0Setting value P high more than steam turbine initial steam pressureHAnd system without
Failure, when valve opening is less than ceiling value, control module is opened greatly by subtracter with certain speed control valve.When main vapour
Pressure P0Setting value P high more than steam turbine initial steam pressureHWhen condition is unsatisfactory for, pressure height limitation control model is automatically exited from.Together
When, control module control breather valve is opened, and exhaust steam valve is closed, and steam heat storage device carries out the storage of excess steam.
In pressure low limit control model, as main vapour pressure P0Setting value P low less than steam turbine initial steam pressureLAnd system without
When failure and valve opening are more than lower limit value, by adder, turned down with certain speed control valve.As main vapour pressure P0It is small
In the low setting value P of steam turbine initial steam pressureLWhen condition is unsatisfactory for, pressure low limit control model is automatically exited from.Meanwhile, control mould
Block control breather valve is closed, while exhaust steam valve is opened, steam heat storage device carries out the supplement of steam.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (3)
1. a kind of steam turbine variable pressure operation control set for adjusting, including initial steam source, servomotor, steam turbine and generator, institute
The input that initial steam source connects steam turbine by jet chimney by main inlet throttle-stop valve valve and inlet valve is stated, the servomotor controls vapour
The inlet valve of turbine, the Steam Turbine Driven generator acting generates electricity, it is characterised in that also including control device, the control
Device includes the jet chimney and steam turbine after control module, measurement module, the measurement module connection main inlet throttle-stop valve, for surveying
Main steam condition and steam turbine operation parameter are measured, the control module connects servomotor, for being controlled to inlet valve valve position
System.
2. steam turbine variable pressure operation control set for adjusting according to claim 1, it is characterised in that the control device is also
Including ramp generator, comparator, module, ratio module, integrator, adder and subtracter are kept, the slope occurs
Device, comparator difference link control module input, the control module output end be sequentially connected holding module, ratio module,
Integrator and servomotor, the adder and subtracter difference link control module output end, adder and subtracter it is defeated
Go out end and connect servomotor respectively.
3. steam turbine variable pressure operation control set for adjusting according to claim 1, it is characterised in that also including steam accumulation of heat
Device, the input of the steam heat storage device has newly steamed source output terminal, the output of steam heat storage device by ventilating valve connection
End is sequentially connected exhaust steam valve and non-return valve, and the ventilating valve and exhaust steam valve are all connected with control module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720222642.5U CN206545526U (en) | 2017-03-09 | 2017-03-09 | A kind of steam turbine variable pressure operation control set for adjusting |
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| CN201720222642.5U CN206545526U (en) | 2017-03-09 | 2017-03-09 | A kind of steam turbine variable pressure operation control set for adjusting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109488394A (en) * | 2018-10-19 | 2019-03-19 | 哈尔滨汽轮机厂有限责任公司 | The control method that million nuclear steam turbine control system machine heaps are coordinated |
| CN109782584A (en) * | 2019-01-21 | 2019-05-21 | 杭州澎康自动化科技有限公司 | A kind of pumping back type steam turbine self-adjusting control |
-
2017
- 2017-03-09 CN CN201720222642.5U patent/CN206545526U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109488394A (en) * | 2018-10-19 | 2019-03-19 | 哈尔滨汽轮机厂有限责任公司 | The control method that million nuclear steam turbine control system machine heaps are coordinated |
| CN109782584A (en) * | 2019-01-21 | 2019-05-21 | 杭州澎康自动化科技有限公司 | A kind of pumping back type steam turbine self-adjusting control |
| CN109782584B (en) * | 2019-01-21 | 2022-05-17 | 杭州澎康自动化科技有限公司 | Self-tuning control method for back-extraction steam turbine |
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| GR01 | Patent grant | ||
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| CB03 | Change of inventor or designer information |
Inventor after: Ji Yunfeng Inventor before: Ji Yunfeng Inventor before: Tu Changfeng |