CN105512800A - Method for determining peak adjustment scheduling of heat supply unit according to mode of ordering power by heat - Google Patents
Method for determining peak adjustment scheduling of heat supply unit according to mode of ordering power by heat Download PDFInfo
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Abstract
The invention discloses a method for determining peak adjustment scheduling of a heat supply unit according to a mode of ordering power by heat. The method comprises the following steps: first of all, performing function fitting on a working condition graph of a researched power supply unit, and performing digitalization to obtain relations between needed variables; then carrying out system correction, i.e., mainly correcting variables affecting a water supply heating system; and finally, performing parameter correction, i.e., mainly correcting major parameters affecting performance of a heat supply type steam turbine. According to the invention, the system correction and the parameter correction are adjusted according to onsite actual operation conditions and values of heat supply amounts. Under the condition that the heat supply amounts are unchanged, the heat supply unit is enabled to realize a minimum generating amount as much as possible so as to contribute to night peak scheduling.
Description
Technical field
The invention provides a kind of easy method determining the minimum generated energy of thermal power plant unit when ensureing that heating load is constant, being applied to the scheduling of electrical network to thermal power plant unit.
Background technology
The top priority of thermal power plant unit bears resident's heat supply, the pattern of electricity determining by heat is adopted when it runs, determine the number of generated energy exactly with the size of thermal load, the thermal load said here is used for commercial production or heating, the basic principle of this Ye Shi China cogeneration of heat and power.Its electric energy sent of this type of unit is equivalent to the accessory substance of heat supply, at this moment while meeting thermal load, just cannot make accurate adjustment to electricity.Consider from the security standpoint of electrical network, each power plant when at a low ebb section of load, should adjust unit output positively, participates in peak load regulation network, or keeps lower load, reduces the impact to electrical network, reduces variable load plant's pressure, coordinates peak regulation; And thermal power plant unit is active participate peak load regulation network hardly in long period of time, but along with the further raising of northern area resident living and commercial production levels, to go into operation thermal power plant unit of certain scale, such unit total volume and proportion are increased further, the electricity produced during heat supply is also increasing, brings some impact to the stability of electrical network; Also dissolving of wind-powered electricity generation can be affected to a certain extent.In addition, the operational mode adopted for cogeneration plant is electricity determining by heat, and this easily occurs that generated energy is superfluous when the network load low ebb phase because of the impact of heat supply, the difficult situation of generated energy deficiency when peak period, and this will worsen the peak-valley difference of network load; In addition the power structure of China also there occurs no small change, and except power load increases considerably, the peak-valley difference duration of electrical network is also more and more longer, and these problems are all urgently to be resolved hurrily.
Peak regulation is participated in for thermal power plant unit, according to the needs of thermal load, optimal operation scheme should be determined, and with the needs meeting thermal load for main target.Area electric administrative department, when formulating this type of power plant's power scheduling curve, must take into full account heating demand curvilinear motion and energy factor, should not limit the external heat supply of cogeneration plant with electricity index, and this type of power plant can not be forced to adopt decompression, desuperheat steam supply.But due to the difference of specialty, power scheduling department is short in understanding to the heating demand curve of various unit and energy factor, lacks related data again, cannot carry out technology confirmation.
In electric power dispatching system, generally only have relevant electric power signal, the heat supply situation of thermal power plant unit cannot be collected.Though work out a scheme between dispatching of power netwoks and heat distribution pipe network run, but need during actual motion to adjust according to the change of power load and thermal load in good time, since present circumstances has shown that thermal power plant unit needs to participate in peak regulation, provide the in good time decision support of technological layer just must to " rational management ".
When electrical network needs peak regulation, thermal power plant unit when ensureing thermal load, should reduce generated energy to coordinate the peak regulation requirement of electrical network as much as possible.But because the method for operation of thermal power plant unit is " electricity determining by heat ", for reducing the consideration of power plant for various reasons of exerting oneself, cause the scheduling of thermal power plant unit electric load not too easily to realize.
Summary of the invention
Goal of the invention: the invention provides one, object is to solve the problem of impacting electrical network when thermal power plant unit participates in peak regulation.
Technical scheme:
According to a method for electricity determining by heat determination thermal power plant unit peak regulation scheduling, it is characterized in that: first the method is carry out Function Fitting to the working condition chart of studied thermal power plant unit, by its digitizing, therefrom obtain the relation between required variable; Then system correction is carried out, mainly for the correction that the variable affecting feed heating system carries out; Finally carry out parameters revision, mainly the major parameter affecting cogeneration turbine performance is revised.System correction and parameters revision are all carry out adjusting according to the practical operation situation at scene and the value of heating load.
For the correction of thermal power plant unit working condition chart, mainly start with from system correction and parameters revision two aspect, by the correction of these two aspects, the error brought when eliminating operating mode offrating;
Simple and efficient in order to what revise, assume that some preconditions when revising, be respectively cogeneration turbine governing stage valve opening remain unchanged, ignore temperature variation at different levels and at different levels groups of internal efficiency ratios in the middle of level group change, suppose shaft seal and door bar leakage rate is constant, extraction line without radiation loss, the through-flow and ability of acting of level is constant.
System correction is mainly for the correction that the variable affecting feed heating system carries out, and then the deviation of elimination feed heating system and backup system is on the impact of Steam Turbine Thermal Property, it is also for parameter provides some preconditions simultaneously, for system correction, its variable mainly revised comprises: the end of feed-water heater is poor, the change of the droop loss of extraction line, system moisture storage capacity, the feed-water enthalpy rise through condensate pump and feed pump, the degree of supercooling of condensate water, boiler desuperheating water, supplementing water flow.
Parameters revision is mainly revised the major parameter affecting cogeneration turbine performance, and parameter important when these parameters are all operations, so must revise when it changes, just can make result more close to actual value; The parameter that parameters revision is mainly revised has: main steam pressure and temperature, reheat steam temperature, heating extraction pressure, low pressure (LP) cylinder exhaust steam pressure.
Advantageous effect:
The object of this invention is to provide a kind of method according to the scheduling of electricity determining by heat determination thermal power plant unit peak regulation, the present invention, according to the working condition chart of thermal power plant unit and with reference to practical operation situation, provides the method for the unit minimum generated energy of a kind of comparatively easy calculating when guarantee heating load is constant.For dispatching of power netwoks is exerted oneself provide reference to thermal power plant unit adjustment electricity, be conducive to the stability of electrical network and the guarantee to heat supply user.
Computing method provided by the invention are simple and efficient, and meet the accuracy requirement in engineering, are convenient to engineering and use.
The present invention is that dispatching of power netwoks provides reference value when participating in peak regulation about thermal power plant unit, making thermal power plant unit when ensureing that heating load is constant, reaching that generated energy is minimum coordinates peak regulation at night as much as possible.
accompanying drawing illustrates:
Fig. 1 is schematic flow sheet of the present invention.
embodiment:below in conjunction with accompanying drawing, the present invention is described further:
As shown in Figure 1, the invention provides a kind of method according to the scheduling of electricity determining by heat determination thermal power plant unit peak regulation, be first that Function Fitting is carried out to the working condition chart of studied thermal power plant unit, by its digitizing, therefrom obtain the relation between required variable; Then system correction is carried out, mainly for the correction that the variable affecting feed heating system carries out; Finally carry out parameters revision, mainly the major parameter affecting cogeneration turbine performance is revised.System correction and parameters revision are all carry out adjusting according to the practical operation situation at scene and the value of heating load.
Due in Practical Project, the use of working condition chart is comparatively frequent, the working condition chart of thermal power plant unit has important effect for the relation determined between electric power and main steam flow and the amount of drawing gas, but the method for inquiry working condition chart operates more loaded down with trivial details, so first carry out working condition chart to carry out Function Fitting, by its digitizing, when meeting heating demand, be convenient to the use in engineering.
The working condition chart that but turbine making producer provides just reflects the relation between electric power under specified main steam condition, reheat steam temperature and exhaust steam pressure condition and main steam flow and the amount of drawing gas, and thinks that Steam Turbine Regenerative System Heater Terminal Temperature Difference, the parameters such as crushing of drawing gas are design load.But in fact, in steam turbine operation process, not only steam turbine just, end condition and reheated steam parameter may off-design values, and the state of heat regenerative system also wants off-design value.Now, the working condition chart that turbine making producer provides just accurately can not reflect the relation between current electric power and main steam flow and the amount of drawing gas.So need to revise working condition chart, thus obtain the relation under arbitrary operating mode between thermal power plant unit electric power and main steam flow and the amount of drawing gas.
For the correction of thermal power plant unit working condition chart, mainly start with from system correction and parameters revision two aspect.By the correction of these two aspects, the error brought when eliminating operating mode offrating.
Simple and efficient in order to what revise, assume that some preconditions when revising, be respectively cogeneration turbine governing stage valve opening remain unchanged, ignore temperature variation at different levels and at different levels groups of internal efficiency ratios in the middle of level group change, suppose shaft seal and door bar leakage rate is constant, extraction line without radiation loss, the through-flow and ability of acting of level is constant.
System correction is mainly for the correction that the variable affecting feed heating system carries out, and then the deviation of elimination feed heating system and backup system is on the impact of Steam Turbine Thermal Property, and it is also for parameter provides some preconditions simultaneously.For system correction, its variable mainly revised comprises: the end of feed-water heater is poor, the change of the droop loss of extraction line, system moisture storage capacity, the feed-water enthalpy rise through condensate pump and feed pump, the degree of supercooling of condensate water, boiler desuperheating water, supplementing water flow.
Parameters revision is mainly revised the major parameter affecting cogeneration turbine performance, and parameter important when these parameters are all operations, so must revise when it changes, just can make result more close to actual value.The parameter that parameters revision is mainly revised has: main steam pressure and temperature, reheat steam temperature, heating extraction pressure, low pressure (LP) cylinder exhaust steam pressure.
This invention advantages of simple, practical, be suitable for peak load regulation network, be conducive to alleviating thermal power plant unit and electrical network is impacted, improve the stability of electrical network, easy to utilize.
Claims (5)
1. according to a method for electricity determining by heat determination thermal power plant unit peak regulation scheduling, it is characterized in that: first the method is carry out Function Fitting to the working condition chart of studied thermal power plant unit, by its digitizing, therefrom obtain the relation between required variable; Then system correction is carried out, mainly for the correction that the variable affecting feed heating system carries out; Finally carry out parameters revision, mainly the major parameter affecting cogeneration turbine performance is revised.
2. system correction and parameters revision are all carry out adjusting according to the practical operation situation at scene and the value of heating load.
3. the method according to the scheduling of electricity determining by heat determination thermal power plant unit peak regulation according to claim 1, is characterized in that:
For the correction of thermal power plant unit working condition chart, mainly start with from system correction and parameters revision two aspect, by the correction of these two aspects, the error brought when eliminating operating mode offrating;
Simple and efficient in order to what revise, assume that some preconditions when revising, be respectively cogeneration turbine governing stage valve opening remain unchanged, ignore temperature variation at different levels and at different levels groups of internal efficiency ratios in the middle of level group change, suppose shaft seal and door bar leakage rate is constant, extraction line without radiation loss, the through-flow and ability of acting of level is constant.
4. the method according to the scheduling of electricity determining by heat determination thermal power plant unit peak regulation according to claim 2, it is characterized in that: system correction is mainly for the correction that the variable affecting feed heating system carries out, and then the deviation of elimination feed heating system and backup system is on the impact of Steam Turbine Thermal Property, it is also for parameter provides some preconditions simultaneously, for system correction, its variable mainly revised comprises: the end of feed-water heater is poor, the droop loss of extraction line, the change of system moisture storage capacity, through the feed-water enthalpy rise of condensate pump and feed pump, the degree of supercooling of condensate water, boiler desuperheating water, supplementing water flow.
5. the method according to the scheduling of electricity determining by heat determination thermal power plant unit peak regulation according to claim 2, is characterized in that:
Parameters revision is mainly revised the major parameter affecting cogeneration turbine performance, and parameter important when these parameters are all operations, so must revise when it changes, just can make result more close to actual value; The parameter that parameters revision is mainly revised has: main steam pressure and temperature, reheat steam temperature, heating extraction pressure, low pressure (LP) cylinder exhaust steam pressure.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107103178A (en) * | 2017-03-10 | 2017-08-29 | 天津市电力科技发展有限公司 | Primary regulation is evacuated combined cycle thermal power plant unit peak modulation capacity computational methods |
| CN108182206A (en) * | 2017-12-14 | 2018-06-19 | 国电南瑞科技股份有限公司 | A kind of thermodynamic conditions thermodynamic property method for monitoring and analyzing |
| CN108319131A (en) * | 2017-12-27 | 2018-07-24 | 国网山东省电力公司电力科学研究院 | Peak load regulation capability assessment method based on data mining |
| CN109063890A (en) * | 2018-06-21 | 2018-12-21 | 国网山东省电力公司电力科学研究院 | One kind being based on the maximized Load Distribution method of the full factory's peak modulation capacity of steam power plant |
| CN109377018A (en) * | 2018-09-27 | 2019-02-22 | 国网河北省电力有限公司电力科学研究院 | Thermal power plant unit peak modulation capacity appraisal procedure |
| CN110348164A (en) * | 2019-07-18 | 2019-10-18 | 国网山东省电力公司电力科学研究院 | A kind of thermoelectricity unit is designed for the modification method of thermal condition figure |
| CN110783008A (en) * | 2019-11-15 | 2020-02-11 | 广西防城港核电有限公司 | Method for rapidly confirming power generation capacity of nuclear power plant |
| CN115833163A (en) * | 2022-08-23 | 2023-03-21 | 大唐泰州热电有限责任公司 | Control method of power supply unit and power supply unit |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107103178A (en) * | 2017-03-10 | 2017-08-29 | 天津市电力科技发展有限公司 | Primary regulation is evacuated combined cycle thermal power plant unit peak modulation capacity computational methods |
| CN108182206A (en) * | 2017-12-14 | 2018-06-19 | 国电南瑞科技股份有限公司 | A kind of thermodynamic conditions thermodynamic property method for monitoring and analyzing |
| CN108319131A (en) * | 2017-12-27 | 2018-07-24 | 国网山东省电力公司电力科学研究院 | Peak load regulation capability assessment method based on data mining |
| CN109063890A (en) * | 2018-06-21 | 2018-12-21 | 国网山东省电力公司电力科学研究院 | One kind being based on the maximized Load Distribution method of the full factory's peak modulation capacity of steam power plant |
| CN109063890B (en) * | 2018-06-21 | 2020-12-15 | 国网山东省电力公司电力科学研究院 | Thermal load distribution method based on thermal power plant whole-plant peak shaving capacity maximization |
| CN109377018A (en) * | 2018-09-27 | 2019-02-22 | 国网河北省电力有限公司电力科学研究院 | Thermal power plant unit peak modulation capacity appraisal procedure |
| CN110348164A (en) * | 2019-07-18 | 2019-10-18 | 国网山东省电力公司电力科学研究院 | A kind of thermoelectricity unit is designed for the modification method of thermal condition figure |
| CN110348164B (en) * | 2019-07-18 | 2022-12-16 | 国网山东省电力公司电力科学研究院 | Correction method for designed heat supply working condition diagram of thermoelectric unit |
| CN110783008A (en) * | 2019-11-15 | 2020-02-11 | 广西防城港核电有限公司 | Method for rapidly confirming power generation capacity of nuclear power plant |
| CN110783008B (en) * | 2019-11-15 | 2022-02-08 | 广西防城港核电有限公司 | Method for rapidly confirming power generation capacity of nuclear power plant |
| CN115833163A (en) * | 2022-08-23 | 2023-03-21 | 大唐泰州热电有限责任公司 | Control method of power supply unit and power supply unit |
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