CN109653820A - A kind of high pressure industrial steam supply system and control method - Google Patents
A kind of high pressure industrial steam supply system and control method Download PDFInfo
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- CN109653820A CN109653820A CN201910055756.9A CN201910055756A CN109653820A CN 109653820 A CN109653820 A CN 109653820A CN 201910055756 A CN201910055756 A CN 201910055756A CN 109653820 A CN109653820 A CN 109653820A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Turbines (AREA)
Abstract
The present invention relates to a kind of high pressure industrial steam supply systems, including boiler, steam turbine high-pressure cylinder, Steam Turbine Through IP Admission and hot press, water supply is thermally formed main steam by boiler superheater, cold steam again is discharged after entering steam turbine high-pressure cylinder in the main steam of boiler, cold steam again enters boiler reheater, steam enters Steam Turbine Through IP Admission to heat outputting again after boiler reheater heating, the vapour source of the high-pressure side air intake of hot press derives from main steam, the vapour source of low-pressure side air intake derives from two-way, it is wherein the cold steam again of steam turbine high-pressure cylinder discharge all the way, another way is the hot steam again of boiler reheater output, hot steam again, which enters on the pipeline of hot press, is arranged the first isolating valve, cold steam again, which enters on the pipeline of hot press, is arranged the second isolating valve；The venthole of hot press provides factory steam.The present invention greatly reduces the steam consumption of main steam, improves energy utilization rate, using pitch ginseng regulation system in steam turbine, unit is made integrally to keep greater efficiency.
Description
Technical field
The present invention relates to a kind of high pressure industrial steam supply system and control methods, belong to fired power generating unit application field.
Background technique
The industrial technology means that cogeneration of heat and power is exported as a kind of multi-product are used for work using the low-quality steam after power generation
Industry manufacture or heating, achieve the purpose that energy maximally utilizes.It is this power generation while, also utilize steam turbine pumping
Vapour or steam discharge are that the thermal power plant of user's heat supply is known as steam power plant, and corresponding unit is also referred to as cogeneration units.Traditional large-scale power generation
The generating efficiency of factory is generally 30%~40%, and 60% or more fuel energy is converted to useless heat, is finally discharged into environment
In；And the cascade utilization co-generation unit for passing through the energy improves efficiency of energy utilization from 40% or so of conventional power generating systems
To 80~90%, fuel availability is significantly improved.
The main application of industrial steam has heating, humidification, cleaning, generates power, as driving etc., and parameter is not quite similar,
It is higher for power and driving consumption industrial steam quality requirements.It, can if existing simultaneously kinds of processes demand in production industry
Power output first is converted to using high-quality steam, steam exhaust is used further to low-quality technique production, and such energy cascade utilization meets
Production technology reduces unnecessary energy simultaneously and uses, and reduces production cost, improves the performance of enterprises.Therefore, in recent years, factory steam
Demand quality gradually holds ascendant trend, and high pressure industrial vapour demand is continuously increased.
For cogeneration units, since its thermoelectricity is coupled operation characteristic, transported when unit load changes in sliding pressure
Row, steam turbine are unable to satisfy merely stable high pressure industrial steam production requirement using steam extraction, if directly using main steam desuperheat
Decompression, then steam quality waste is more serious.
In view of above-mentioned, the applicant is actively subject to research and innovation, invents pitch in a kind of steam turbine and participates in control and be based on
The efficient industrial steam supply system and control method that unit efficiency is adjusted can be applicable in the steaming of cogeneration units high pressure industrial
Vapour supply, with more the utility value in industry.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of high pressure industrial steam supply systems, greatly reduce master
The steam consumption of steam improves energy utilization rate, meanwhile, the present invention also uses pitch ginseng regulation system in steam turbine, negative in unit electricity
When lotus and external high pressure industrial air demand change, reheated steam parameter is adjusted, unit is made integrally to keep greater efficiency.
Technical solution of the present invention one is as follows:
A kind of high pressure industrial steam supply system, including boiler, steam turbine high-pressure cylinder, Steam Turbine Through IP Admission and hot press,
Cold steam again is discharged after entering steam turbine high-pressure cylinder in the main steam of boiler, and the cold steam again enters boiler reheater, and boiler is again
Steam enters Steam Turbine Through IP Admission to heat outputting again after hot device heating, and the steam of Steam Turbine Through IP Admission discharge enters steam turbine low-pressure
Cylinder, the hot press include high-pressure side air intake and low-pressure side air intake, and the vapour source of high-pressure side air intake derives from main steam, low
Press side air intake vapour source derive from two-way, wherein be all the way steam turbine high-pressure cylinder discharge cold steam again, be all the way boiler again
The hot steam again of hot device output, the hot steam again, which enters on the pipeline of hot press, is arranged the first isolating valve, the cold steam again
The second isolating valve is set on into the pipeline of hot press；The venthole of the hot press provides factory steam, in the hot press
Needle valve is set in portion's steam admission side mixing chamber, by needle-like valve regulation high-pressure side air intake vapour source into steam flow amount.
More preferably, the main steam, which enters, is arranged regulating valve on the pipeline of hot press.
More preferably, the hot steam again, which enters, is arranged pitch in steam turbine on the pipeline of Steam Turbine Through IP Admission.
The present invention also provides a kind of control methods of high pressure industrial steam supply system.
Technical solution of the present invention two is as follows:
A kind of control method of high pressure industrial steam supply system, including step S1:
When S1, unit operate normally, the first isolating valve is closed, and regulating valve and the second isolating valve is opened, according to unit load
And factory steam amount, main steam enter hot press high-pressure side air intake and steam turbine high-pressure cylinder simultaneously, main steam is as hot press
High voltage power vapour source, steam turbine high-pressure cylinder output cold steam again enter hot press low-pressure side air intake as low pressure vapour source,
Cold steam again is converted to heat steam again also into boiler reheater simultaneously, and steam enters Steam Turbine Through IP Admission to heat again；Hot press is logical
It crosses and adjusts its internal needle valve, output meets the high pressure industrial steam of user demand.
More preferably, when factory steam flow is by small increase, the control method further includes step S2:
S2, with factory steam flow increase, flow into hot press high-pressure side air intake main steam flow increase, flow into heat
The cold quantity of steam again of press low-pressure side air intake increases simultaneously, and the cold amount of steam extraction again of steam turbine, which gradually increases so that, flows into boiler reheating
The cold steam flow again of device is gradually reduced, boiler reheater temperature increase, when hot press low-pressure side air intake low pressure vapour source into
When vapour amount reaches the switching threshold of setting, control system issues instruction, and the first isolating valve is gradually opened, and the second isolating valve gradually closes
It closes, the vapour source of hot press low-pressure side air intake switches to heat steam again, hot low pressure of the steam as hot press again by cold steam again
Vapour source, steam is also delivered to Steam Turbine Through IP Admission to heat simultaneously again；When the low pressure vapour source throttle flow of hot press low-pressure side air intake is low
When the switching threshold of setting, control system issues instruction, and the first isolating valve progressively closes off, and the second isolating valve is gradually opened, heat
By heat, steam switches back into cold steam again to the vapour source of press low-pressure side air intake again；The different corresponding switching thresholds of unit electric load
Also different, unit electric load and switching threshold correspond
More preferably, the switching threshold passes through Q0=f (Pe, t) and it determines, in which: Q0For the low of hot press low-pressure side air intake
Press vapour source throttle flow, f (Pe, t) and it is low pressure vapour source throttle flow and unit electric load PeWith the relationship of boiler reheater temperature limit t
Function is obtained according to unit actual motion characteristic by testing fitting, specifically, it is determined that current unit electric load Pe, system adopts
Use cold steam again as low pressure vapour source, in following two condition, when reaching any wherein condition, by current hot press low-pressure side into
The low pressure vapour source throttle flow of steam ports is as switching threshold, and condition one: the cold amount of steam extraction again of hot press low-pressure side air intake reaches limit
When value, condition two: boiler reheater reaches temperature limit.
More preferably, when unit during normal operation, after hot press investment, execute energy saving regulating step S3:
S3, according to unit heat consumption formula
q0=(D0×h0-Dfw×hfw-Drcw×hrcw+Drh×hrh-Drc×hrc-Drhw×hrhw)/Pe, obtain current unit
Overall thermal water consumption it is flat, adjust pitch in steam turbine, change reheated steam parameter；After reheated steam parameter change, into hot pressing
The high steam of machine and the ratio of low-pressure steam change, and hot press carries out main steam flow adjustment by the needle valve,
Keep external evaporation capacity for engine constant；Continuously cooperated by pitch in steam turbine and carry out the adjustment of reheated steam parameter, consumes hot press
High steam accounting reduces, to make unit overall thermal water consumption put down minimum while meeting external evaporation capacity for engine, wherein
q0For unit heat consumption rate；D0For main steam flow；h0For main steam enthalpy；DfwFor main feedwater flow；hfwFor main Enthalpy of Feed Water；
DrcwFor desuperheating water of superheater flow；hrcwFor desuperheating water of superheater enthalpy；DrhFor reheated steam flow；hrkFor reheated steam enthalpy
Value；DrcFor high pressure cylinder exhaust steam flow；hrcFor high pressure cylinder steam discharge enthalpy；DrhwFor boiler reheater attemperation water flow；hrhwFor boiler
Reheater desuperheating water enthalpy；PeFor unit electric load.
More preferably, when unit is in heavy-duty service, the main steam throughput of boiler is greatly increased, and main steam enters vapour
Pressure that pressure and main steam in the pipeline of turbine high pressure cylinder enter in the pipeline of hot press high-pressure side air intake while increasing,
The control method also executes step S4:
S4, the aperture for adjusting regulating valve, are in the pressure of hot press high-pressure side air intake within the scope of its pressure-bearing, guarantee heat
Press exports stable high pressure industrial steam.
The invention has the following beneficial effects:
1, in industrial steam supply system of the present invention, hot press uses steam turbine main steam injection reheated steam, shape of converging
At high pressure industrial steam, compared with tradition is using the direct pressure and temperature reducing of main steam, avoids excessively throttling and using desuperheating water, have
Higher economy.
2, in industrial steam supply system of the present invention, hot press uses cold steam again and heat steam two-way injection vapour source again,
Cold steam again is preferentially used, can be switched over according to steam turbine operation situation and steam consumption demand, there is good flexible operation
Property and customer charge adaptability.
3, in industrial steam supply system of the present invention, according to unit practical operation situation, pitch is pressed to join using in steam turbine
Tune mode adjusts hot press vapour source parameter based on entire unit economy, compared to traditional simple pursuit hot press own efficiency
Control method further promotes the energy saving space.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of high pressure industrial steam supply system of the present invention.
Appended drawing reference indicates in figure are as follows:
1, hot press；2, boiler；3, steam turbine high-pressure cylinder；4, Steam Turbine Through IP Admission, 5, regulating valve, the 6, first isolating valve；
7, the second isolating valve；8, middle pitch；9, boiler reheater；10, turbine low pressure cylinder；11, high-pressure side air intake；12, low-pressure side
Air intake；13, superheater.
Specific embodiment
It is next in the following with reference to the drawings and specific embodiments that the present invention will be described in detail.
Embodiment one
Referring to Fig. 1, a kind of high pressure industrial steam supply system, including hot press 1, boiler 2, steam turbine high-pressure cylinder 3, vapour
Cold steam again is discharged after entering steam turbine high-pressure cylinder 3 in turbine intermediate pressure cylinder 4, the main steam of boiler 2, and the cold steam again enters boiler
Reheater 9, steam enters Steam Turbine Through IP Admission 4 to 9 heat outputting of boiler reheater again, and the steam that Steam Turbine Through IP Admission 4 is discharged enters
Turbine low pressure cylinder 10, the hot press 1 include high-pressure side air intake 11 and low-pressure side air intake 12, high-pressure side air intake 11
Vapour source derives from main steam, and the vapour source of low-pressure side air intake 12 derives from two-way, wherein being that steam turbine high-pressure cylinder 3 is discharged all the way
Cold steam again is the hot steam again that boiler reheater 9 exports all the way, and the venthole of the hot press 1 provides factory steam, described
Needle valve is set in 1 inside steam admission side mixing chamber of hot press, by needle-like valve regulation high-pressure side air intake 11 vapour source into steam flow
Amount.
Steam enters on the pipeline of hot press 1 the first isolating valve 6 is arranged the heat again, and the cold steam again enters hot press
Second isolating valve 7 is set on 1 pipeline.Switch 1 low-pressure side air intake of hot press by the first isolating valve 6 and the second isolating valve 7
12 low pressure vapour source, when the first isolating valve 6 is closed, and the second isolating valve 7 is opened, low-pressure steam of the cold steam again as hot press 1
Source, when the first isolating valve 6 is opened, and the second isolating valve 7 is closed, low pressure vapour source of the cold steam again as hot press 1,
The main steam, which enters, is arranged regulating valve 5 on the pipeline of hot press 1.When unit is in heavy-duty service, boiler 2
Main steam throughput greatly increase, the pressure and main steam that main steam enters in the pipeline of steam turbine high-pressure cylinder 3 enter hot pressing
Pressure in the pipeline of 1 high-pressure side air intake 11 of machine increases simultaneously, adjusts the aperture of regulating valve 5, makes 1 high-pressure side of hot press into vapour
The pressure of mouth 11 is within the scope of its pressure-bearing,Pressure-bearing range is the characterisitic parameter that hot press 1 has itself, is generally said in its product
It is explained in bright book, stablizes the pressure of 1 high-pressure side air intake 11 of hot press, guarantee that hot press 1 exports stable high pressure industrial
Steam.
The hot steam again, which enters, is arranged pitch 8 in steam turbine on the pipeline of Steam Turbine Through IP Admission 4.Pass through pitch in adjusting
8 aperture reaches unit overall thermal water consumption and equals minimum purpose.
1 system of hot press, high voltage power vapour source are connected with low-pressure steam on the pipeline of hot press 1, optionally
Setting isolation valve group, thermometer, pressure gauge, flowmeter etc., can show vapour source parameter and system running state, heat may be implemented
The components such as non-return flap are optionally arranged in the isolation of press vapour source, steam to 1 pipeline of hot press.Hot press 1 is a kind of typical quality
Pump has very big volume to contribute, bore various different sizes etc. from DN1000 to DN4000 when conveying low-density working medium
Grade comprising middle pressure steam exports after power steam input terminal, low-pressure steam input terminal, mixing.The power steam input terminal
Elevated pressures fluid is inputted, forms high negative, injection low pressure vapour source in hot press mixing chamber.Electrodeless adjustable hot press is dynamic
Power steam input terminal increases needle-like valving mechanisms, can be changed according to customer charge, flexibly change the cross-section area of nozzle, reach flat
It is sliding to adjust flow purpose.Low-pressure steam input terminal, formed negative pressure, can be used for vacuumizing, the upgrading of low parameter steam, evaporation, refrigeration,
Aeration, mixing.Middle pressure steam exports after mixing, can be used for heating, factory steam etc..Hot press principle is logical using working steam
Cross nozzle injection generate high speed steam flow, by jetting steam caused sucking, make its pressure and temperature improve, and the pressure of high steam and
Temperature reduces, to generate target component steam for users to use.
Working principle of the present invention is: when unit operates normally, the first isolating valve 6 is closed, and opens regulating valve 5 and the second isolation
Valve 7, according to unit load and factory steam amount, main steam enters 1 high-pressure side air intake 11 of hot press and turbine high-pressure simultaneously
Cylinder 3, high voltage power vapour source of the main steam as hot press 1, steam turbine high-pressure cylinder 3 export cold steam again as low pressure vapour source into
Enter 1 low-pressure side air intake 12 of hot press, while cold steam again is converted to heat steam again, hot steam again also into boiler reheater 9
Into Steam Turbine Through IP Admission 4；Hot press 1 exports the high pressure industrial steaming for meeting user demand by adjusting the needle valve of its inside
Vapour.
When factory steam flow is by small increase, the main steam flow for flowing into 1 high-pressure side air intake 11 of hot press increases, stream
Enter the cold quantity of steam again of 1 low-pressure side air intake 12 of hot press while increasing, the cold amount of steam extraction again of steam turbine gradually increases so that inflow
The cold steam flow again of boiler reheater 9 is gradually reduced, and 9 temperature of boiler reheater increases, when 1 low-pressure side air intake 12 of hot press
Low pressure vapour source throttle flow when reaching the switching threshold of setting, control system issues instruction, and the first isolating valve 6 is gradually opened, the
Two isolating valves 7 progressively close off, and the vapour source of 1 low-pressure side air intake 12 of hot press switches to heat steam again by cold steam again, and heat is steamed again
Low pressure vapour source of the vapour as hot press 1, steam is also delivered to Steam Turbine Through IP Admission 4 to heat simultaneously again；When 1 low-pressure side of hot press is into vapour
When the low pressure vapour source throttle flow of mouth 12 is lower than the switching threshold set, control system issues instruction, and the first isolating valve 6 gradually closes
It closes, the second isolating valve 7 is gradually opened, and by heat, steam switches back into cold steam again to the vapour source of 1 low-pressure side air intake 12 of hot press again；No
The same corresponding switching threshold of unit electric load is also different, and unit electric load and switching threshold correspond.The switching threshold
Pass through determination, in which: Q0It is low pressure vapour source throttle flow and machine for the low pressure vapour source throttle flow of 1 low-pressure side air intake 12 of hot press
Group electric load PeWith the relation function of 9 temperature limit t of boiler reheater, it is fitted according to unit actual motion characteristic by test
Out, specifically, it is determined that current unit electric load Pe, system as low pressure vapour source, in following two condition, reached using cold steam again
When any wherein condition, using the low pressure vapour source throttle flow of current 1 low-pressure side air intake 12 of hot press as switching threshold, condition
One: when the cold amount of steam extraction again of 1 low-pressure side air intake 12 of hot press reaches limit value, condition two: boiler reheater 9 reaches temperature limit
Value.For example, rated capacity is 300MW unit in 30% rate of load condensate, unit boiler reheater metal temperature limit value is 620 DEG C,
By test, when meeting boiler reheater temperature limit condition, the steam extraction maximum stream flow of cold steam again is 80t/h, then this electricity is negative
Under lotus, Q0Value is determined as 80t/h.Rated capacity is 300MW unit in 50% rate of load condensate, 9 metal temperature of boiler reheater limit
Value is 620 DEG C, and by test, the steam extraction of cold steam again reaches flow when being 100t/h, cannot extract more cold steam again out again,
Although 9 metal temperature of boiler reheater is 590 DEG C at this time, and not up to limit value, under this electric load, by Q0Value is determined as
100t/h。
When unit during normal operation, hot press 1 put into after, energy saving adjusting can also be carried out, specifically: according to unit heat
Consume formula q0=(D0×h0-Dfw×hfw-Drcw×hrcw+Drh×hrh-Drc×hrc-Drhw×hrhw)/Pe, obtain current unit
Overall thermal water consumption is flat, adjusts pitch 8 in steam turbine, changes reheated steam parameter；After reheated steam parameter change, into hot press
1 high steam and the ratio of low-pressure steam change, and hot press 1 carries out main steam flow adjustment by the needle valve,
Keep external evaporation capacity for engine constant；By pitch 8 in steam turbine, continuously cooperation carries out the adjustment of reheated steam parameter, and hot press 1 is made to disappear
It consumes high steam accounting to reduce, to make unit overall thermal water consumption put down minimum while meeting external evaporation capacity for engine, wherein its
In, q0For unit heat consumption rate, kJ/kWh；D0For main steam flow, MW；h0For main steam enthalpy, kJ/kg；DfwBased on give water flow
Amount, t/h；hfwFor main Enthalpy of Feed Water, kJ/kg；DrcwFor superheater, (superheater is set in boiler, and water supply is thermally formed
Main steam) attemperation water flow, t/h；hrcwFor desuperheating water of superheater enthalpy, kJ/kg；DrhFor reheated steam flow, t/h；hrkFor
Reheated steam enthalpy, kJ/kg；DrcFor 3 exhaust steam flow of high pressure cylinder, t/h；hrcFor 3 steam discharge enthalpy of high pressure cylinder, kJ/kg；DrhwFor pot
9 attemperation water flow of furnace reheater, t/h；hrhwFor 9 desuperheating water enthalpy of boiler reheater, kJ/kg；PeFor unit electric load, kW.Example
Such as, when unit electric load declines, hot press pump gas ablity declines therewith, under identical steam supply flow, high-pressure steam source injection low pressure
Vapour source ratio reduces, and transition consumes high-quality steam, calculates unit heat consumption q at this time01；Middle pressure pitch is opened after middle pressure pitch ginseng is adjusted
Degree reduces, and since throttling action makes reheated steam pressure rise, hot press pump gas ablity increases at this time, low pressure vapour source injection ratio
Increase, hot press reduces high-pressure steam source steam consumption automatically and maintains external steam supply flow constant, calculates unit heat consumption q at this time02, control
Systematic comparison q01With q02, automatically guide unit and adjust to the lower operating condition of heat consumption.
When meeting user's factory steam demand, by pitch 8 in adjusting, change the parameter of reheated steam, it is cold again
Steam pressure changes again for steam and heat, and 1 high-pressure steam source of hot press, low pressure vapour source use ratio change, and then unit
Practical heat consumption changes.Steam supply adjustment is participated in by middle pitch 8,8 open range of pitch in best is determined, makes to meet extraneous confession
Simultaneously, unit entirety heat consumption is in minimum state to vapour amount.
In the present invention, hot press 1 is high voltage power vapour source using steam turbine main steam, and steam turbine reheated steam is as injection
Low-pressure steam, confluence form the high pressure industrial vapour for meeting user demand, greatly reduce the steam consumption of main steam, improve energy benefit
With rate.The reheated steam of 1 injection of hot press includes the cold steam again of 3 steam discharge of high pressure cylinder and the heat by boiler reheater 9
Steam again.Meanwhile the present invention also uses the ginseng of pitch 8 regulation system in steam turbine, supplies in unit electric load and external high pressure industrial
When amount changes, reheated steam parameter is adjusted, unit is made integrally to keep greater efficiency.
Embodiment two
Referring to Fig. 1, a kind of control method of high pressure industrial steam supply system, includes the following steps:
S1: when unit operates normally, the first isolating valve 6 is closed, and opens regulating valve 5 and the second isolating valve 7, negative according to unit
Lotus and factory steam amount, main steam enter 1 high-pressure side air intake 11 of hot press and steam turbine high-pressure cylinder 3, main steam conduct simultaneously
The high voltage power vapour source of hot press 1, the cold steam again that steam turbine high-pressure cylinder 3 exports enter 1 low pressure of hot press as low pressure vapour source
Side air intake 12, while cold steam again is converted to heat steam again also into boiler reheater 9, hot steam again, which enters in steam turbine, presses
Cylinder 4；Hot press 1 exports the high pressure industrial steam for meeting user demand by adjusting the needle valve of its inside.
When factory steam flow is by small increase, step S2 can also carry out
S2: when factory steam flow is by small increase, the main steam flow for flowing into 1 high-pressure side air intake 11 of hot press increases
Add, the cold quantity of steam again for flowing into 1 low-pressure side air intake 12 of hot press increases simultaneously, and the cold amount of steam extraction again of steam turbine gradually increases so that
The cold steam flow again for flowing into boiler reheater 9 is gradually reduced, and 9 temperature of boiler reheater increases, when 1 low-pressure side of hot press is into vapour
When the low pressure vapour source throttle flow of mouth 12 reaches the switching threshold of setting, control system issues instruction, and the first isolating valve 6 is gradually opened
It opens, the second isolating valve 7 progressively closes off, and the vapour source of 1 low-pressure side air intake 12 of hot press switches to heat steam again, heat by cold steam again
Low pressure vapour source of the steam as hot press 1 again, steam is also delivered to Steam Turbine Through IP Admission 4 to heat simultaneously again；When 1 low-pressure side of hot press
When the low pressure vapour source throttle flow of air intake 12 is lower than the switching threshold set, control system issues instruction, and the first isolating valve 6 is gradually
It closes, the second isolating valve 7 is gradually opened, and by heat, steam switches back into cold steam again to the vapour source of 1 low-pressure side air intake 12 of hot press again；
The different corresponding switching thresholds of unit electric load is also different, and unit electric load and switching threshold correspond.The conversion threshold
Value passes through Q0=f (Pe, t) and it determines, in which: Q0It is low-pressure steam for the low pressure vapour source throttle flow of 1 low-pressure side air intake 12 of hot press
Source throttle flow and unit electric load PeIt is logical according to unit actual motion characteristic with the relation function of 9 temperature limit t of boiler reheater
Overtesting fitting obtains, specifically, it is determined that current unit electric load Pe, system uses cold steam again as low pressure vapour source, following
In two conditions, when reaching any wherein condition, using the low pressure vapour source throttle flow of current 1 low-pressure side air intake 12 of hot press as
Switching threshold, condition one: when the cold amount of steam extraction again of 1 low-pressure side air intake 12 of hot press reaches limit value, condition two: boiler reheater
9 reach temperature limit.For example, rated capacity is 300MW unit in 30% rate of load condensate, unit boiler reheater metal temperature limit
Value is 620 DEG C, and by test, when meeting 9 temperature limit condition of boiler reheater, the steam extraction maximum stream flow of cold steam again is 80t/
H, then under this electric load, Q0Value is determined as 80t/h.Rated capacity is 300MW unit in 50% rate of load condensate, boiler reheater 9
Metal temperature limit value is 620 DEG C, and by test, the steam extraction of cold steam again reaches flow when being 100t/h, cannot be extracted out again more
Cold steam again, although 9 metal temperature of boiler reheater is 590 DEG C at this time, and not up to limit value, under this electric load, by Q0
Value is determined as 100t/h.
When unit during normal operation, hot press 1 put into after, energy saving regulating step S3 can also be carried out, specifically:
S3: according to unit heat consumption formula
q0=(D0×h0-Dfw×hfw-Drcw×hrcw+Drh×hrh-Drc×hrc-Drhw×hrhw)/Pe, obtain current unit
Overall thermal water consumption it is flat, adjust pitch 8 in steam turbine, change reheated steam parameter；After reheated steam parameter change, into hot pressing
The high steam of machine 1 and the ratio of low-pressure steam change, and hot press 1 carries out main steam flow tune by the needle valve
It is whole, keep external evaporation capacity for engine constant；By pitch 8 in steam turbine, continuously cooperation carries out the adjustment of reheated steam parameter, makes hot press 1
It consumes high steam accounting to reduce, to make unit overall thermal water consumption put down minimum while meeting external evaporation capacity for engine, wherein
Wherein, q0For unit heat consumption rate, kJ/kWh；D0For main steam flow, MW；h0For main steam enthalpy, kJ/kg；DfwFor main water supply
Flow, t/h；hfwFor main Enthalpy of Feed Water, kJ/kg；DrcwFor desuperheating water of superheater flow, (superheater is set in boiler, will
Water supply is thermally formed main steam), t/h；hrcwFor desuperheating water of superheater enthalpy, kJ/kg；DrhFor reheated steam flow, t/h；hrk
For reheated steam enthalpy, kJ/kg；DrcFor 3 exhaust steam flow of high pressure cylinder, t/h；hrcFor 3 steam discharge enthalpy of high pressure cylinder, kJ/kg；DrhwFor
9 attemperation water flow of boiler reheater, t/h；hrhwFor 9 desuperheating water enthalpy of boiler reheater, kJ/kg；PeFor unit electric load, kW.
For example, hot press pump gas ablity declines therewith, and under identical steam supply flow, high-pressure steam source injection is low when the decline of unit electric load
Vapour source ratio is pressed to reduce, transition consumes high-quality steam, calculates unit heat consumption q at this time01；Middle pressure pitch after middle pressure pitch ginseng is adjusted
Aperture reduces, and since throttling action makes reheated steam pressure rise, hot press pump gas ablity increases at this time, low pressure vapour source injection ratio
Example increases, and hot press reduces high-pressure steam source steam consumption automatically and maintains external steam supply flow constant, calculates unit heat consumption q at this time02, control
Systematic comparison q processed01With q02, automatically guide unit and adjust to the lower operating condition of heat consumption.
When meeting user's factory steam demand, by pitch 8 in adjusting, change the parameter of reheated steam, it is cold again
Steam pressure changes again for steam and heat, and 1 high-pressure steam source of hot press, low pressure vapour source use ratio change, and then unit
Practical heat consumption changes.Steam supply adjustment is participated in by middle pitch 8,8 open range of pitch in best is determined, makes to meet extraneous confession
Simultaneously, unit entirety heat consumption is in minimum state to vapour amount.
In the present invention, hot press 1 is high voltage power vapour source using steam turbine main steam, and steam turbine reheated steam is as injection
Low-pressure steam, confluence form the high pressure industrial vapour for meeting user demand, greatly reduce the steam consumption of main steam, improve energy benefit
With rate.The reheated steam of 1 injection of hot press includes the cold steam again of 3 steam discharge of high pressure cylinder and the heat by boiler reheater 9
Steam again.Meanwhile the present invention also uses the ginseng of pitch 8 regulation system in steam turbine, supplies in unit electric load and external high pressure industrial
When amount changes, reheated steam parameter is adjusted, unit is made integrally to keep greater efficiency.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (8)
1. a kind of high pressure industrial steam supply system, including boiler (2), steam turbine high-pressure cylinder (3) and Steam Turbine Through IP Admission (4),
The main steam of boiler (2) enters steam turbine high-pressure cylinder (3) and cold steam again is discharged afterwards, and the cold steam again enters boiler reheater
(9), steam enters Steam Turbine Through IP Admission (4) boiler reheater (9) heat outputting again, Steam Turbine Through IP Admission (4) discharge steam into
Enter turbine low pressure cylinder (10), it is characterised in that: further include a hot press (1) comprising high-pressure side air intake (11) and low pressure
The vapour source of side air intake (12), high-pressure side air intake (11) derives from main steam, and the vapour source of low-pressure side air intake (12) derives from
Two-way is that the heat of boiler reheater (9) output is steamed again all the way wherein being the cold steam again of steam turbine high-pressure cylinder (3) discharge all the way
Vapour, steam enters on the pipeline of hot press (1) and is arranged the first isolating valve (6) heat again, and the cold steam again enters hot press
(1) the second isolating valve (7) are set on pipeline；The venthole of the hot press (1) provides factory steam.
2. a kind of high pressure industrial steam supply system according to claim 1, it is characterised in that: the main steam enters heat
Regulating valve (5) are set on the pipeline of press (1).
3. a kind of high pressure industrial steam supply system according to claim 1, it is characterised in that: steam enters the heat again
Pitch (8) in steam turbine is set on the pipeline of Steam Turbine Through IP Admission (4).
4. a kind of control method of high pressure industrial steam supply system, steams including a kind of high pressure industrial described in claims 1 to 3
Vapour supply system, which is characterized in that the control method includes step S1:
When S1, unit operate normally, the first isolating valve (6) is closed, and regulating valve (5) and the second isolating valve (7) is opened, according to unit
Load and factory steam amount, main steam enter hot press (1) high-pressure side air intake (11) and steam turbine high-pressure cylinder (3) simultaneously, main
The cold steam again of high voltage power vapour source of the steam as hot press (1), steam turbine high-pressure cylinder (3) output enters as low pressure vapour source
Hot press (1) low-pressure side air intake (12), while cold steam again is converted to heat steam again also into boiler reheater (9), heat is again
Steam enters Steam Turbine Through IP Admission (4)；Hot press (1) exports the height for meeting user demand by adjusting the needle valve of its inside
Press industrial steam.
5. according to right want 4 described in a kind of control method of high pressure industrial steam supply system, which is characterized in that when industrial
When steam flow amount is by small increase, the control method further includes step S2:
S2, with factory steam flow increase, flow into hot press (1) high-pressure side air intake (11) main steam flow increase, stream
Enter the cold quantity of steam again of hot press (1) low-pressure side air intake (12) while increasing, the cold amount of steam extraction again of steam turbine gradually increases so that
The cold steam flow again for flowing into boiler reheater (9) is gradually reduced, and boiler reheater (9) metal temperature increases, when hot press (1)
When the low pressure vapour source throttle flow of low-pressure side air intake (12) reaches the switching threshold of setting, control system issue instruction, first every
It is gradually opened from valve (6), the second isolating valve (7) progressively closes off, and the vapour source of hot press (1) low-pressure side air intake (12) is steamed again by cold
Steam cutting shifts to heat steam again, and low pressure vapour source of the steam as hot press (1), hot steam again are also delivered in steam turbine heat simultaneously again
Cylinder pressure (4)；When switching threshold of the low pressure vapour source throttle flow of hot press (1) low-pressure side air intake (12) again below setting,
Control system issues instruction, and the first isolating valve (6) progressively closes off, and the second isolating valve (7) is gradually opened, hot press (1) low-pressure side
By heat, steam switches back into cold steam again to the vapour source of air intake (12) again；The different corresponding switching thresholds of unit electric load is not yet
Together, unit electric load and switching threshold correspond。
6. a kind of control method of high pressure industrial steam supply system according to claim 5, it is characterised in that: described turn
It changes threshold value and passes through Q0=f (Pe, t) and it determines, in which: Q0For the low pressure vapour source throttle flow of hot press (1) low-pressure side air intake (12), f
(Pe, t) and it is low pressure vapour source throttle flow and unit electric load PeWith the relation function of boiler reheater (9) temperature limit t, according to machine
Group actual motion characteristic is obtained by testing fitting, specifically, it is determined that current unit electric load Pe, system is using cold steam again work
For low pressure vapour source, in following two condition, when reaching any wherein condition, by current hot press (1) low-pressure side air intake (12)
Low pressure vapour source throttle flow as switching threshold, condition one: the cold amount of steam extraction again of hot press (1) low-pressure side air intake (12) reaches
When limit value, condition two: boiler reheater (9) reaches temperature limit.
7. a kind of control method of high pressure industrial steam supply system according to claim 4, it is characterised in that: work as unit
During normal operation, after hot press (1) investment, energy saving regulating step S3 is executed:
S3, according to unit heat consumption formula
q0=(D0×h0-Dfw×hfw-Drcw×hrcw+Drh×hrh-Drc×hrc-Drhw×hrhw)/Pe, obtain the entirety of current unit
Heat consumption is horizontal, adjusts pitch (8) in steam turbine, changes reheated steam parameter；After reheated steam parameter change, into hot press
(1) ratio of high steam and low-pressure steam changes, and hot press (1) carries out main steam flow tune by the needle valve
It is whole, keep external evaporation capacity for engine constant；By pitch in steam turbine (8), continuously cooperation carries out the adjustment of reheated steam parameter, makes hot pressing
Machine (1) consumes high steam accounting and reduces, thus put down unit overall thermal water consumption minimum while meeting external evaporation capacity for engine,
Wherein, wherein q0For unit heat consumption rate；D0For main steam flow；h0For main steam enthalpy；DfwFor main feedwater flow；hfwBased on
Enthalpy of Feed Water；DrcwFor desuperheating water of superheater flow；hrcwFor desuperheating water of superheater enthalpy；DrhFor reheated steam flow；hrkFor again
Hot steam enthalpy；DrcFor high pressure cylinder exhaust steam flow；hrcFor high pressure cylinder steam discharge enthalpy；DrhwFor boiler reheater (9) desuperheat water flow
Amount；hrhwFor boiler reheater (9) desuperheating water enthalpy；PeFor unit electric load.
8. a kind of control method of high pressure industrial steam supply system according to claim 4, it is characterised in that: work as unit
When in heavy-duty service, the main steam flow of boiler (2) is greatly increased, and main steam enters the pipeline of steam turbine high-pressure cylinder (3)
Pressure that interior pressure and main steam enters in the pipeline of hot press (1) high-pressure side air intake (11) while increasing, the control
Method also executes step S4:
S4, the aperture for adjusting regulating valve (5), are in the pressure of hot press (1) high-pressure side air intake (11) within the scope of its pressure-bearing,
Guarantee that hot press (1) exports stable high pressure industrial steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910055756.9A CN109653820A (en) | 2019-01-22 | 2019-01-22 | A kind of high pressure industrial steam supply system and control method |
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| CN201910055756.9A CN109653820A (en) | 2019-01-22 | 2019-01-22 | A kind of high pressure industrial steam supply system and control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396158A (en) * | 2020-03-05 | 2020-07-10 | 上海舟虹电力工程技术中心 | Use method of high-temperature high-pressure steam energy-saving mixing |
| CN111457450A (en) * | 2020-05-06 | 2020-07-28 | 大唐环境产业集团股份有限公司 | Thermoelectric decoupling system and working method |
| CN113266435A (en) * | 2021-07-02 | 2021-08-17 | 华北电力科学研究院有限责任公司 | Method and device for adjusting high exhaust pressure by using medium-pressure adjusting door |
-
2019
- 2019-01-22 CN CN201910055756.9A patent/CN109653820A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396158A (en) * | 2020-03-05 | 2020-07-10 | 上海舟虹电力工程技术中心 | Use method of high-temperature high-pressure steam energy-saving mixing |
| CN111457450A (en) * | 2020-05-06 | 2020-07-28 | 大唐环境产业集团股份有限公司 | Thermoelectric decoupling system and working method |
| CN113266435A (en) * | 2021-07-02 | 2021-08-17 | 华北电力科学研究院有限责任公司 | Method and device for adjusting high exhaust pressure by using medium-pressure adjusting door |
| CN113266435B (en) * | 2021-07-02 | 2023-06-06 | 华北电力科学研究院有限责任公司 | Method and device for adjusting high discharge pressure by medium-pressure regulating door |
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Application publication date: 20190419 |