CN202501496U - Coal property correction system of thermal generator set - Google Patents
Coal property correction system of thermal generator set Download PDFInfo
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- CN202501496U CN202501496U CN2012201715690U CN201220171569U CN202501496U CN 202501496 U CN202501496 U CN 202501496U CN 2012201715690 U CN2012201715690 U CN 2012201715690U CN 201220171569 U CN201220171569 U CN 201220171569U CN 202501496 U CN202501496 U CN 202501496U
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Abstract
The utility model provides a coal property correction system of a thermal generator set. The system comprises an RB control loop, a steam turbine generator unit, a coal feeder, a remote control terminal device and an on-line coal property correction device, wherein the on-line coal quality correction device comprises an input device, an electricity meter, a coal meter and an output interface, the input device is sued for inputting statistics period T and coal type corresponding constant K by a user; the electricity meter is used for receiving active power signals, and generating the gross generation in the statistics period T generated according to the active power signals; the coal meter is used for receiving the gross coal quantity signals and generating the gross fire coal quantity in the statistics period T generated according to the gross coal quantity signals; and the output interface is used for outputting the coal property correction parameter X to the RB control loop.
Description
Technical field
The utility model is about thermal power generating technology, particularly about the fast cutback of thermal power generation unit technology, is about a kind of thermal power generation unit coal correction system concretely.
Background technology
When the thermal power generation unit moves under than higher load condition; If cause the part Important Auxiliary equipment trip for a certain reason; When causing unit not continue to keep heavy-duty service; RB (RUNBACK unit fast cutback) control function will be according to the present situation of type, fault degree and the unit operation of tripping operation subsidiary engine; Automatically calculate the peak load of the safe and stable operation that current unit can guarantee, and this is coordinated each control system of unit as target load, reduce unit load apace.
For responding national energy-saving and emission-reduction policy, low, the heavy-polluted small-sized fired power generating unit of power-generating enterprise's efficient will progressively be replaced by 300MW, 600MW, 1000MW grade large electric power plant unit, improve unit generation efficient.In large-scale unit, the meaning of RB test seems more outstanding.Along with the raising of monoblock installed capacity, its security and stability more directly has influence on the safety and stability of monoblock even whole electrical network, and the RB function is exactly in order to satisfy unit carries out security control to unit under improper operating mode critical function.Domestic each thermal power generation unit has all designed the RB function, and formally puts the RB test one of into commercial operation preceding indispensable project as set grid-connection.Simultaneously requirements at the higher level are proposed for unit RB action success rate and RB action back set steady level.
The designer finds to exist at least in the prior art following not enough in the process that realizes the utility model:
In the prior art, following principle is generally followed in the design of thermal power generation unit RB function: for satisfying electrical network AGC load demand for control, present 90% above fired power generating unit is normally moved selection " stove is with machine " and is coordinated control model.After the RB action; The safety and stability of unit with compare even more important to the mains supply quality; Coodination modes switches to " turbine follow " control mode immediately; Promptly main steam pressure is responded faster turbine governor valve and carry out main vapour pressure and regulate, keep main vapour pressure and boiler load and mate and guarantee that unit safety stablizes according to the design curve utilization.Simultaneously the boiler side combustion control system reduces the corresponding coal supply rate of fuel to target load immediately fast, keeps the stable of the combustion system that receives violent disturbance, and ensures that the relevant important control parameter of protection such as unit master stripping temperature is in reasonable control range.The modular design of RB control loop is as shown in Figure 1.
Above-mentioned design is that unit is selected corresponding RB target load automatically according to equipment fault type and degree, is converted to target amount after revising according to fixed constant K then.This method for designing satisfies instructions for use basically, but because the order of accuarcy of target coal supply rate directly influences unit master stripping temperature control level, influences unit safety stable operation.Present domestic most thermal power generation units face that fuel is in short supply, the complicated instability of coal variety, coal burning caloricity just change multiple complex forms such as big.Fig. 1 modular design adopts constant K can not satisfy the control accuracy that ature of coal changes operating mode, when the RB action often takes place because the too high or too low accident such as unit fire extinguishing stopping production that causes of target coal supply rate.
With certain generating set 1000MW ultra supercritical direct current stove is example, and steam turbine is the corresponding design coal 356t/h of operating mode 1000MW at full capacity, and in the actual moving process full load situation to the minimum 310t/h of coal supply rate, the highest 420t/h that but reaches.According to design coal design K=0.356.Because ature of coal changes, RB action back target coal supply rate actual deviation is calculated as follows:
(1) when the at full capacity corresponding 310t/h fuel quantity of unit, 50%Pe RB taking place, is 178t/h by design coal target coal supply rate, and the actual 155t/h that should be, the higher 23t/h of RB action back realistic objective coal supply rate.This moment, unit was slow in RB operating mode decline load speed, caused separate unit subsidiary engine overrun easily, and overtemperature causes the generator protection action easily, influenced the set steady operation.
(2) when the at full capacity corresponding 420t/h fuel quantity of unit, 50%Pe RB taking place, is 178t/h by design object coal supply rate, and the actual 210t/h that should be, RB action back realistic objective coal supply rate 32t/h on the low side.Unit this moment actual load under accident conditions can be lower than 50%Pe, even influences low-load combustion-stabilizing, worsens combustion efficiency, burner hearth fire extinguishing easily.
Data analysis shows that the inapplicable unit burning coal of current modular design Fig. 1 scheme is situation of change significantly, causes the unit combustion instability easily after the RB action, even fire-putting-out emergency.Have a strong impact on unit safety stable operation, also can cause greater impact electrical network in case fire-putting-out emergency takes place.Constant K should change variable element into to adapt to the ature of coal situation of change among modular design Fig. 1, could improve the safety and stability level after unit RB moves.
In order to overcome the ature of coal variation issue that occurs among Fig. 1, the coal correction loop has appearred in the prior art, and typical coal correction control loop is as shown in Figure 2, and corrected value X is used for replacing the constant K of Fig. 1.
The typical coal correction strategy of Fig. 2 carries out computation of Period through " the real power/real-time fuel quantity of sending out " ratio; Statistical method itself is not considered dynamic processes such as unit sliding pressure; In unit transformation power setting value process,, factors such as change boiler energy storage stablize the coal supply rate because possibly causing actual coal supply rate to depart from this load correspondence; Ratio (the real power/actual coal supply rate of sending out) itself can not be represented the data of steady working condition, directly influences the reliability of statistics, and final coal correction coefficient X is not accurate enough.In order to improve the accuracy of statistics, just Fig. 2 typical case coal correction strategy requires operating modes such as parameters such as unit steam temperature, vapour pressure are basicly stable, unit load does not change can carry out statistical calculation, the actual motion unit is difficult to satisfy.Requiring to generate electricity by way of merging two or more grid systems such as present grid company, unit AGC control is omnidistance drops into; When unit AGC adjustment mode is set at the control model by the self-regulating BLR of electrical network domain error (ACE) (Base Load Regulated); Unit load instruction frequent movement then; Operate as normal can't be carried out in typical case's coal correction loop, and its accommodation is narrow, practicality is relatively poor.
The utility model content
The utility model provides a kind of thermal power generation unit coal correction system; When response RB moves, to judge the caloric value situation of current burning coal in time, exactly; Proofread and correct RB action back boiler target fuel command, improve unit RB success of the test rate and RB action afterburner combustion system stability.
The utility model provides a kind of thermal power generation unit coal correction system to achieve these goals; This system comprises: RB control loop, Turbo-generator Set, feeder and RTU; It is characterized in that; Described system also comprises: ature of coal on-line correction equipment, and described ature of coal on-line correction equipment comprises: input unit is used for the user and imports statistic period T and the corresponding constant K of coal; Voltameter is used to receive the active power signal, and generates the gross generation in the statistic period T according to said diligent power signal; Coal meter is used to receive total coal amount signal, and generates the total Coal-fired capacity in the statistic period T according to said total coal amount signal; Output interface is used for the coal correction parameter X is exported to described RB control loop.
Further, this ature of coal on-line correction equipment also comprises: first input interface is used for said active power signal is transferred to described voltameter.
Further, this ature of coal on-line correction equipment also comprises: second input interface is used for said total coal amount signal is transferred to described coal meter.
Further, this ature of coal on-line correction equipment also comprises: first divider, and take into account coal meter with described electric weight respectively through interface and be connected, be used to generate the ratio of said gross generation and total Coal-fired capacity; First divider is connected with described first divider and input unit respectively through interface, is used for generating the coal correction parameter X according to said ratio and K.
The useful technique effect of the utility model is; Thermal power generation unit coal correction of the present invention system can judge the caloric value situation of current burning coal in time, exactly when response RB action; Proofread and correct RB action back boiler target fuel command, improved unit RB success of the test rate and RB action afterburner combustion system stability.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.In the accompanying drawings:
Fig. 1 is a thermoelectric generator group RB control loop sketch map in the prior art one;
Fig. 2 is a thermoelectric generator group typical case coal correction control loop sketch map in the prior art two;
Fig. 3 is the structural representation of the utility model embodiment ature of coal on-line correction equipment;
Fig. 4 is the structural representation of the utility model embodiment thermal power generation unit coal correction system.
The specific embodiment
For the purpose, technical scheme and the advantage that make the utility model embodiment is clearer, the utility model embodiment is explained further details below in conjunction with accompanying drawing.At this, illustrative examples of the utility model and explanation thereof are used to explain the utility model, but not as the qualification to the utility model.
Like Fig. 3 and shown in Figure 4, present embodiment provides a kind of thermal power generation unit coal correction system, and described system comprises: RB control loop, Turbo-generator Set, feeder, RTU and ature of coal on-line correction equipment.
Rectangle frame is represented ature of coal on-line correction equipment among Fig. 3, and ature of coal on-line correction equipment 300 comprises: input unit 301, voltameter 302, coal meter 303, output interface 304 hardware configurations such as grade.
Like Fig. 3 and shown in Figure 4, ature of coal on-line correction equipment also comprises: input interface 305 and input interface 306.Input interface 305 is used for said active power signal is transferred to described voltameter.Input interface 306 is used for said total coal amount signal is transferred to described coal meter.Interface 305 described here and interface 306 can be serial ports or USB mouth etc., and the utility model is not as limit.
Ature of coal on-line correction equipment 300 systems also comprise: divider 307 and divider 308; Divider 307 is connected with described voltameter 302 and coal meter 303 respectively through the built-in interface (not shown), is used to generate the ratio of said gross generation and total Coal-fired capacity.Divider 308 is connected with described divider 307 and input unit 301 respectively through the built-in interface (not shown), is used for generating the coal correction parameter X according to said ratio and K.The RB trigger condition just gets into change-over switch through interface 30, and the coal correction parameter X is carried out coal correction through being input to RB control loop 101 after the change-over switch.
The application's thermal power generation unit coal correction system is based on that conservation of energy principle-because the variation of the energy storage of thermal power generation unit (amount of stored heat) own subtracts when increasing during along with reasons such as unit varying duties, but the total amount of the whole relatively periodical energy transfer process of unit energy storage change absolute value can be ignored in measurement period.Therefore can think that cycle fuel total amount and gross generation ratio can reflect current ature of coal caloric value situation really, and with this ratio as statistics, the accuracy of the correction coefficient of can upgrading.
Significantly variation of coal-fired quality generation when the thermal power generation unit; During the substantial deviation design coal; On basis based on the RB control loop of prior art; Through the accuracy that the control loop (being ature of coal on-line correction equipment 300) of " carrying out coal correction based on conservation of energy principle utilization statistic algorithm " shown in Figure 4 can be upgrade and proofreaied and correct, improved the unit safety coefficient of stability after RB moves, improved the power supply quality of generating set.Illustrate it below:
Certain 1000MW ultra supercritical direct current stove generating set; Design coal coal supply rate is 356t/h at full capacity; Suppose primary air fan RB takes place, require target load to reduce to 500MW, it is 30 minutes that coal correction loop measurement period is set; RB moves that the accumulative total generated energy is 400MW in the previous measurement period, and the coal-fired total amount of accumulative total is 136t.Then according to corrective loop shown in Figure 3, constant
Do not carry out coal correction according to Fig. 1, then RB action back target coal supply rate Y=500 * K=178t/h
Carry out coal correction according to Fig. 4: calculating coal correction coefficient:
calculating RB action back target coal supply rate Y is: Y=500 * K * X=500 * 0.356 * 0.955=169.99t/h;
Target coal supply rate differs 178-169.99 ≈ 8t/h before and after the coal correction.As target coal amount is higher after not proofreading and correct then RB action, influences load down speed.
Can know that by above-mentioned analysis " " control loop of function is revised the constant K of modular design Fig. 1, the accuracy of upgrading and proofreading and correct to carry out coal correction based on conservation of energy principle utilization statistic algorithm through design.The present invention " corrective loop " has the some cycles statistical law, and statistical method is simple, accurate, is highly suitable for ature of coal and changes thermal power generation unit coordination control strategy greatly.
Based on above analysis; Then unit operation condition in the measurement period is not done strict restriction; The unit operation mode can be manual or coodination modes, and destabilizing factors such as the switching of AGC investing method, unit master vapour pressure, steam temperature fluctuation do not have any impact to statistics.
Statistic algorithm-coal correction loop is calculated the interior gross generation of previous measurement period in real time and is calculated current coal correction coefficient X with total fuel ga(u)ge.Measurement period can manually be provided with or select fixed time period by the operations staff through the DCS system configuration.
The work calculation condition of the application's thermal power generation unit coal correction system does not require that unit parameter is stable; Applicability is strong; Statistical signal is representative; Thereby can react the quality of current fire coal really, improve the control accuracy of RB action back boiler target coal supply rate, necessary condition is provided for improving RB action back set steady level.
Be applied in the typical RB control loop, can reduce, improve the reliability of unit safety stable operation, satisfy the technical requirement of electrical network and power monitoring department, strengthen the economic benefit of thermal power generation unit operation because ature of coal changes the potential safety hazard that causes.
The conceptual design of the application's thermal power generation unit coal correction system is simple; Workable; Unconditionally limit in the statistical calculation loop, applied widely, can effectively solve the coal-fired quality variation of current fired power generating unit and cause the unit inferior problem of control automatically more greatly.
Above-described specific embodiment; Purpose, technical scheme and beneficial effect to the utility model have carried out further explain, it should be understood that the above is merely the specific embodiment of the utility model; And be not used in the protection domain that limits the utility model; All within the spirit and principle of the utility model, any modification of being made, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (4)
1. thermal power generation unit coal correction system; Described system comprises: RB control loop, Turbo-generator Set, feeder and RTU; It is characterized in that described system also comprises: ature of coal on-line correction equipment, described ature of coal on-line correction equipment comprises:
Input unit is used for the user and imports statistic period T and the corresponding constant K of coal;
Voltameter is used to receive the active power signal, and generates the gross generation in the statistic period T according to said diligent power signal;
Coal meter is used to receive total coal amount signal, and generates the total Coal-fired capacity in the statistic period T according to said total coal amount signal;
Output interface is used for the coal correction parameter X is exported to described RB control loop.
2. system according to claim 1 is characterized in that, described ature of coal on-line correction equipment also comprises:
First input interface is used for said active power signal is transferred to described voltameter.
3. system according to claim 1 is characterized in that, described ature of coal on-line correction equipment also comprises:
Second input interface is used for said total coal amount signal is transferred to described coal meter.
4. system according to claim 1 is characterized in that, described ature of coal on-line correction equipment also comprises:
First divider is taken into account coal meter with described electric weight respectively through interface and is connected, and is used to generate the ratio of said gross generation and total Coal-fired capacity;
First divider is connected with described first divider and input unit respectively through interface, is used for generating the coal correction parameter X according to said ratio and K.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104654269A (en) * | 2014-12-18 | 2015-05-27 | 山东中实易通集团有限公司 | Method for automatically adjusting RB (runback) target value by heat value correction coefficient in thermal power generating unit |
| CN104699064A (en) * | 2015-03-20 | 2015-06-10 | 东南大学 | Coal quality self-correcting and predictive control method for coordinated control system of thermal power generating unit |
| CN104932310A (en) * | 2015-06-05 | 2015-09-23 | 山东电力研究院 | Self-adaptive coal quality adjustment system and method in RUNBACK (RB) process |
| CN109785187A (en) * | 2019-03-14 | 2019-05-21 | 国网山东省电力公司电力科学研究院 | A kind of electric set electric supply coal consumption detection data bearing calibration |
-
2012
- 2012-04-20 CN CN2012201715690U patent/CN202501496U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104654269A (en) * | 2014-12-18 | 2015-05-27 | 山东中实易通集团有限公司 | Method for automatically adjusting RB (runback) target value by heat value correction coefficient in thermal power generating unit |
| CN104654269B (en) * | 2014-12-18 | 2016-08-24 | 山东中实易通集团有限公司 | The method that in thermal power generation unit, calorific value correction coefficient adjusts RB desired value automatically |
| CN104699064A (en) * | 2015-03-20 | 2015-06-10 | 东南大学 | Coal quality self-correcting and predictive control method for coordinated control system of thermal power generating unit |
| CN104699064B (en) * | 2015-03-20 | 2017-03-08 | 东南大学 | A kind of ature of coal self-tuning model method of fired power generating unit coordinated control system |
| CN104932310A (en) * | 2015-06-05 | 2015-09-23 | 山东电力研究院 | Self-adaptive coal quality adjustment system and method in RUNBACK (RB) process |
| CN109785187A (en) * | 2019-03-14 | 2019-05-21 | 国网山东省电力公司电力科学研究院 | A kind of electric set electric supply coal consumption detection data bearing calibration |
| CN109785187B (en) * | 2019-03-14 | 2020-10-16 | 国网山东省电力公司电力科学研究院 | Method for correcting power supply coal consumption detection data of generator set |
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Owner name: NORTH CHINA POWER SCIENCE RESEARCH INST., CO., LTD Effective date: 20131030 Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: NORTH CHINA POWER SCIENCE RESEARCH INST., CO., LTD. Effective date: 20131030 |
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Effective date of registration: 20131030 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: North China Electrical Power Research Institute LLC Address before: 100045 Beijing Fuxingmenwai Di Zang an Nan Xiang No. Patentee before: North China Electrical Power Research Institute LLC |
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