CN103279658A - Thermal generator set working condition optimizing method - Google Patents
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- CN103279658A CN103279658A CN2013101903275A CN201310190327A CN103279658A CN 103279658 A CN103279658 A CN 103279658A CN 2013101903275 A CN2013101903275 A CN 2013101903275A CN 201310190327 A CN201310190327 A CN 201310190327A CN 103279658 A CN103279658 A CN 103279658A
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Abstract
The invention discloses a thermal generator set working condition optimizing method which comprises the steps that, optimizing working conditions of generator sets of all coal quality zones are obtained according to a data model of preset optimizing working conditions and are stored into a coal quality database; whether a coal quality zone of input coal corresponds to a coal quality zone stored in the coal quality database or not is judged, if yes, whether loads of a current generator set correspond to a load zone recorded in the belonged coal quality zone or not is judged, if not, the coal quality zone is set up; whether a current operation working condition corresponds to the optimizing working condition recorded in the belonged load zone or not is judged, if yes, the optimizing working condition corresponding to the load zone is read in the coal quality database, if not, the belonged load zone of the loads of the current generator set is set up, and the optimizing working condition is calculated according to coal quality testing data. According to the thermal generator set working condition optimizing method, influence factors on optimizing of the work condition of coal quality are fully taken into consideration, and accuracy of an optimizing result of the work condition is high.
Description
Technical field
The present invention relates to the electric power project engineering field, particularly relate to a kind of thermal power generation unit operating mode optimization method.
Background technology
The optimization operation, the energy-saving and emission-reduction that how to realize fired power generating unit are the important topics in thermal power generation field always, at present, for thermal power generation unit operating mode optimization method, do not consider the influence of ature of coal factor, and the influence factor of considering is comparatively single, have bigger gap between the optimum operating condition that obtains thus and the actual optimum operating mode, operating mode optimizing result's accuracy is low.
Summary of the invention
Based on this, be necessary at the problems referred to above, a kind of thermal power generation unit operating mode optimization method is provided.
A kind of thermal power generation unit operating mode optimization method comprises the steps:
The data model of the optimum operating condition that S101, basis are preset obtains the optimum operating condition of the genset of each ature of coal section, and it is saved in the coal data storehouse; Wherein, the data model of described optimum operating condition is made of ature of coal section, load section and optimum operating condition, and described optimum operating condition comprises the optimum excess air coefficient scope of boiler, the optimum sliding pressure definite value of steam turbine and the optimal device array mode of auxiliary equipment system;
S102, obtain the ature of coal section under the ature of coal analysis data of input coal, judge that this ature of coal section is whether corresponding with the ature of coal section preserved in the coal data storehouse, if, enter S104, if not, enter S103;
S103, in the coal data storehouse, set up this ature of coal section according to described data model, enter S105;
Whether S104, the load of judging current genset be corresponding with the load section that recorded in the affiliated ature of coal section, if, enter S106, if not, enter S105;
S105, in the coal data storehouse, set up the load section under the load of current genset according to described data model, enter S108;
S106, judge that current operating condition is whether corresponding with the optimum operating condition that recorded in the affiliated load section, if, enter S107, if not, enter S108;
S107, from described coal data storehouse, read the optimum operating condition of this load section correspondence;
S108, in the coal data storehouse, set up current operating condition according to described data model;
S109, calculate the optimum operating condition in the operating condition under this load section according to described ature of coal analysis data, return S101.
Above-mentioned thermal power generation unit operating mode optimization method, thermal power generation unit operating mode optimization method, take all factors into consideration the factor that ature of coal changes, at first set up data mould and the coal data storehouse of optimum operating condition, the optimum operating condition that obtains is increased in the coal data storehouse, when the operating mode optimizing, the optimum operating condition of preserving in the coal data storehouse is mated optimizing, regulate in conjunction with the genset controllable parameter simultaneously and optimize, the array mode of utility appliance operation, calculate the optimum operating condition of new ature of coal and be increased in the coal data storehouse, this method has taken into full account the influence factor of ature of coal for the operating mode optimizing, operating mode optimizing result's accuracy height.
Description of drawings
Fig. 1 is the thermal power generation unit operating mode optimization method process flow diagram of an embodiment;
Fig. 2 is the structural representation of data model of the optimum operating condition of an embodiment.
Embodiment
Be described in detail below in conjunction with the embodiment of accompanying drawing to thermal power generation unit operating mode optimization method of the present invention.
The kind of coal and character all have a significant impact structure, type selecting, the layout of heating surface and economy and the reliability of operation of boiler of power plant combustion apparatus, and therefore, big-and-middle-sized boiler of power plant all is to design according to certain coal.The ature of coal leading indicator is made of fugitive constituent, ash content, moisture, thermal value etc., burning all can have very big influence and each factor is to unit, if the coal of burning differs too big with the design coal elemental composition, can cause the increase of the decline of unit combustion stability, the reduction of boiler utilization rate, power plant's electricity consumption, usefulness coal, and equipment attrition causes the increase of maintenance cost etc.
The thermal power generation unit operating mode optimization method of this patent, take all factors into consideration the factor that ature of coal changes, in the operating mode optimizing, regulate the array mode of optimization, utility appliance operation etc. in conjunction with the genset controllable parameter, the optimum operating condition that adopts the operating mode optimization method of this patent to obtain makes the operational efficiency of genset higher, economy is more excellent.
Referring to shown in Figure 1, Fig. 1 is the thermal power generation unit operating mode optimization method process flow diagram of an embodiment, mainly comprises the steps:
The data model of the optimum operating condition that S101, basis are preset obtains the optimum operating condition of the genset of each ature of coal section, and it is saved in the coal data storehouse.
Referring to shown in Figure 2, Fig. 2 is the structural representation of data model of the optimum operating condition of an embodiment, this data model is made of ature of coal section, load section and optimum operating condition, and wherein the interval of ature of coal section can be 3000kJ/kg, and the interval of ature of coal section can be 10%.
Concrete, carry out section according to the net calorific value of coal and divide, carry out the section coupling after handling according to the data computation of ature of coal result of laboratory test.For example, the calorific value of every kilogram of standard coal equivalent of China's regulation is 7000 kilocalories (29306kJ), is a section with 3000kJ/kg, then is divided into 5 ature of coal sections from 15000kJ/kg to 30000kJ/kg.
For optimum operating condition, mainly comprise the optimum excess air coefficient scope of boiler, the optimum sliding pressure definite value of steam turbine and the optimal device array mode of auxiliary equipment system, wherein, optimum excess air coefficient scope, optimum sliding pressure definite value are the controllable parameter scope, because the optimization of fired power generating unit is the optimizing process of a multiple goal, multiple constraint, and may there be remarkable, great variation in external environment condition, external condition, therefore, above-mentioned optimum operating condition is set to the range of operation of the best of genset controllable parameter, and adaptability is stronger.
Wherein, main consideration coal pulverizer, pressure fan, induced draft fan, feed pump and condensate pump etc. in the auxiliary equipment system, then the equipment array mode is the array mode of coal pulverizer, pressure fan, induced draft fan, feed pump and condensate pump operation.
S102, obtain the ature of coal section under the ature of coal analysis data of input coal, judge that this ature of coal section is whether corresponding with the ature of coal section preserved in the coal data storehouse, if, enter S104, if not, enter S103.
Concrete, namely pass through the computing to the ature of coal analysis data of input coal, carry out ature of coal section coupling then, judge whether the ature of coal section of input coal has been kept in the coal data storehouse.
S103, in the coal data storehouse, set up this ature of coal section according to described data model, enter S105.
Concrete, it fails to match for the ature of coal section, and the optimum operating condition that does not have this ature of coal section in the coal data storehouse is described, therefore, sets up this ature of coal section in the coal data storehouse, because follow-up operating mode optimizing.
Whether S104, the load of judging current genset be corresponding with the load section that recorded in the affiliated ature of coal section, if, enter S106, if not, enter S105.
Concrete, the match is successful for the ature of coal section, and the optimum operating condition of having preserved this ature of coal section in the coal data storehouse is described, further judges the affiliated load section of load of current genset, carries out next step operating mode optimizing.
S105, in the coal data storehouse, set up the load section under the load of current genset according to described data model, enter S108.
Concrete, it fails to match for the load section, illustrates in the coal data storehouse, do not have the optimum operating condition of this load section in the affiliated ature of coal section, therefore, sets up this load section in the coal data storehouse, because follow-up operating mode optimizing.
S106, judge that current operating condition is whether corresponding with the optimum operating condition that recorded in the affiliated load section, if, enter S107, if not, enter S108.
Concrete, the match is successful for the load section, the optimum operating condition of this load section has been preserved in explanation in the coal data storehouse, further judge in the current auxiliary equipment system operational process the equipment array mode whether with the coal data storehouse in the equipment array mode coupling of preserving, thereby carry out next step operating mode optimizing.
S107, from described coal data storehouse, read the optimum operating condition of this load section correspondence;
Concrete, the match is successful for the utility appliance array mode, explanation is in the coal data storehouse, the complete optimum operating condition of this load section has been preserved in explanation in the coal data storehouse, therefore, read the optimum operating condition of this load section correspondence from the coal data storehouse, comprise optimum excess air coefficient scope, optimum sliding pressure definite value and optimal device array mode, this optimum operating condition is the optimized operation operating mode of current genset.
S108, in the coal data storehouse, set up current operating condition according to described data model.
Concrete, it fails to match for the equipment array mode, explanation is in the coal data storehouse, also be somebody's turn to do the complete optimum operating condition of load section, at this moment, the current device array mode need be kept in the coal data storehouse, under this load section, carry out optimizing according to the ature of coal analysis data then, obtain complete optimum operating condition.
S109, calculate the optimum operating condition in the operating condition under this load section according to described ature of coal analysis data, return S101.
Concrete, described ature of coal analysis data uses unit performance experimental standard regulation and associated hot theory of mechanics to calculate, obtain the complete optimum operating condition of this load section, be saved in the coal data storehouse according to the optimum operating condition of data model with the genset under this ature of coal section then.
Thermal power generation unit operating mode optimization method of the present invention, at first set up data model and the coal data storehouse of optimum operating condition, utilize then this data model district obtain each known ature of coal section genset optimum operating condition and be kept in the coal data storehouse, when carrying out the operating mode optimizing, by in the coal data storehouse, ature of coal result of laboratory test to the input coal is mated the ature of coal section of having preserved, according to the ature of coal section, load section and operating condition, successively mate, in the coal data storehouse, there is corresponding ature of coal section, when load section and operating condition, read the optimum operating condition of having preserved, be the optimum operating condition of current genset, if there is no corresponding ature of coal section, load section and operating condition, then successively carry out newly-built according to the optimizing path, then according to the ature of coal analysis data, genset performance test standard and associated hot theory of mechanics are calculated cost of electricity-generating, obtain optimum operating condition in conjunction with genset operational efficiency and economic index analysis-by-synthesis.
In searching process, the optimizing result is kept at and is used in the coal data storehouse calling calculating, and the optimizing result in the coal data storehouse will be on the increase along with the increase of various operating modes and the equipment method of operation.
In one embodiment, calculate the method for the optimum operating condition in the operating condition under this load section among the step S109 according to described ature of coal analysis data, can comprise the steps:
(1) under described load section, calculate the boiler efficiency of group of motors operation according to the ature of coal analysis data, obtain the optimum excess air coefficient scope of described boiler efficiency boiler when the highest.
Concrete, the boiler efficiency computing method can adopt positive balance method or counter balancing method, and the positive balance method is namely calculated boiler efficiency with known fuel consumption and effective utilization, and counter balancing method namely calculates boiler thermal output by the every thermal loss of boiler.In the adjustment of actual power unit operation, flue gas oxygen content is the key that realizes the combustion process optimal control, by the oxygen content α in the excess air coefficient α of the boiler furnace outlet place control flue gas generally in 1.15～1.25 scope, at boiler thermal output during high scope, calculate the α value variation range of optimum flue gas oxygen content scope correspondence, can determine optimum excess air coefficient scope.
(2) under described load section, gather the real-time running data of genset peak regulation, calculate the highest sliding pressure definite value of economic index according to the ature of coal analysis data.
Concrete, normal in service in order to satisfy the demand of power supply, the large electric power plant unit often carries out peak regulation, steam turbine producer can provide the sliding pressure definite value of declared working condition or several typical conditions according to inlet pressure-hear rate generally speaking, but owing to the different factor of ature of coal, the accuracy of sliding pressure curve and ageing just being difficult to are guaranteed in actual motion.
Therefore, by in the peak regulation process, gathering the peak regulation related data in real time, genset is carried out the calculating of thermodynamic property and economic performance index, under the load of setting, be preferably principle according to economy, constantly result of calculation is compared, obtain optimum sliding pressure operation operating mode under the same load, form the genset sliding pressure line of one group of optimum, then this genset sliding pressure line is the highest sliding pressure definite value of economic index, in actual applications, can consider to allow certain deviation range, the force value that can accept in the deviation range on genset sliding pressure line then can be as more excellent force value.
(3) under described load section, calculate the coa consumption rate under the various utility appliance array modes, and obtain the minimum utility appliance array mode of coa consumption rate.
Concrete, in subsidiary engine equipment, mainly consider the array mode of subsidiary engine equipment operations such as coal pulverizer, pressure fan, induced draft fan, feed pump, condensate pump.
For example, the total N platform coal pulverizer of general every unit, the performance of every coal pulverizer self plays decisive influence to exerting oneself, so under the identical unit load condition, because the coal pulverizer difference of operation can cause the unit efficiency difference, this sentences the classification of equipment array mode, with carrying out optimizing on a kind of basis of equipment array mode.
In genset, condenser vacuum is an important parameter that influences the genset performance driving economy, and the method for operation of condensate pump is bigger to the influence of indexs such as condenser vacuum and station service power consumption rate.In theory, increase circulating water flow and can reduce the unit back pressure, improve unit efficiency, but the power consumption of condensate pump is increased, thereby net coal consumption rate is increased.
Therefore in the judge method of economic index of the condensate pump method of operation of certain environment temperature and steam turbine load condition be:
ΔP=ΔP
tur-ΔP
pmp
Wherein, Δ P
TurBe the steam turbine power increment, Δ P
PmpBe water circulating pump power consumption increment; As Δ P〉0 the time, illustrate that to increase the both economical property of condensate pump platform number index higher, otherwise economic index is lower.
In one embodiment, before step S101 obtains the optimum operating condition of genset of each ature of coal section, can also comprise the steps:
Judge whether described optimum operating condition meets the data area that sets in safety standards, stability criterion and the feature of environmental protection standard, if then enter step S101.
Particularly, judge whether described optimum operating condition meets the data area in the safety standards, judge whether described optimum operating condition meets actual load, target load, instruction load and the load changing rate scope in the stability criterion, judge whether described optimum operating condition meets the requirement of feature of environmental protection standard, after meeting above-mentioned safety standards, stability criterion and feature of environmental protection standard, just preserve this optimum operating condition.
For the factor that influences the operating condition quality, security, stability and the feature of environmental protection are the factors that power plant or unit operation need be considered, should get rid of outside optimum operating condition for the operating mode that does not satisfy safety standards, stability criterion and feature of environmental protection standard.
Also as the precondition of evaluation optimum operating condition, when operating mode is under the security parameter overrun condition, economic benefit can not think well that again it is more excellent operating mode, does not carry out the operating mode record in security.Get rid of outside optimum operating condition without exception for unsteady operating conditions, operating mode stability is judged by actual load, target load, instruction load, four indexs of load changing rate, as the absolute value of the difference of target load and instruction load less than load changing rate, then carry out next step judgement, otherwise think that the current time is unstable period; If actual load has been caught up with target load, think that then the current time is steady working condition, otherwise think that the current time is unstable period.Simultaneously, meeting above-mentioned safety standards, stability criterion, judging the feature of environmental protection standard of unit again, just evaluating when having only being emitted on of unit to meet environmental administration's relevant regulations emission standard.
Thermal power generation unit operating mode optimization method of the present invention, in the middle of actual motion, through the typing of long ature of coal result of laboratory test and the calculating of optimizing, can access the optimum operating condition under the situation that ature of coal changes, the range of operation and the equipment array mode that comprise the best of genset controllable parameter, this optimum operating condition can be realized the purpose that the genset operation is optimized as the genset operational efficiency in this ature of coal section, the best operating mode of economy.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (6)
1. a thermal power generation unit operating mode optimization method is characterized in that, comprising:
The data model of the optimum operating condition that S101, basis are preset obtains the optimum operating condition of the genset of each ature of coal section, and it is saved in the coal data storehouse; Wherein, the data model of described optimum operating condition is made of ature of coal section, load section and optimum operating condition, and described optimum operating condition comprises the optimum excess air coefficient scope of boiler, the optimum sliding pressure definite value of steam turbine and the optimal device array mode of auxiliary equipment system;
S102, obtain the ature of coal section under the ature of coal analysis data of input coal, judge that this ature of coal section is whether corresponding with the ature of coal section preserved in the coal data storehouse, if, enter S104, if not, enter S103;
S103, in the coal data storehouse, set up this ature of coal section according to described data model, enter S105;
Whether S104, the load of judging current genset be corresponding with the load section that recorded in the affiliated ature of coal section, if, enter S106, if not, enter S105;
S105, in the coal data storehouse, set up the load section under the load of current genset according to described data model, enter S108;
S106, judge that current operating condition is whether corresponding with the optimum operating condition that recorded in the affiliated load section, if, enter S107, if not, enter S108;
S107, from described coal data storehouse, read the optimum operating condition of this load section correspondence;
S108, in the coal data storehouse, set up current operating condition according to described data model;
S109, calculate the optimum operating condition in the operating condition under this load section according to described ature of coal analysis data, return S101.
2. thermal power generation unit operating mode optimization method according to claim 1 is characterized in that, the described step of calculating the optimum operating condition in the operating condition under this load section according to described ature of coal analysis data comprises:
Under described load section, calculate the boiler efficiency of group of motors operation according to the ature of coal analysis data, obtain the optimum excess air coefficient scope of described boiler efficiency boiler when the highest;
Under described load section, gather the real-time running data of genset peak regulation, calculate the highest sliding pressure definite value of economic index according to the ature of coal analysis data;
Under described load section, calculate the coa consumption rate under the various utility appliance array modes, and obtain the minimum utility appliance array mode of coa consumption rate.
3. thermal power generation unit operating mode optimization method according to claim 1 is characterized in that, also comprises before step S101:
Judge whether described optimum operating condition meets the data area that sets in safety standards, stability criterion and the feature of environmental protection standard, if then enter step S101.
4. thermal power generation unit operating mode optimization method according to claim 1 is characterized in that, described ature of coal section be spaced apart 3000kJ/kg.
5. thermal power generation unit operating mode optimization method according to claim 1 is characterized in that, described ature of coal section be spaced apart 10%.
6. thermal power generation unit operating mode optimization method according to claim 1 is characterized in that, described equipment array mode is the array mode of coal pulverizer, pressure fan, induced draft fan, feed pump and condensate pump operation.
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| CN108595821A (en) * | 2018-04-19 | 2018-09-28 | 内蒙古电力勘测设计院有限责任公司 | A kind of design method and device of power plant chemistry system |
| CN109919516A (en) * | 2019-03-28 | 2019-06-21 | 国网山东省电力公司电力科学研究院 | One kind being based on coal varitation peak load regulation judgment method |
| CN110782365A (en) * | 2019-09-26 | 2020-02-11 | 中国神华能源股份有限公司国华电力分公司 | Parameter optimization interval configuration method and device, electronic equipment and storage medium |
| CN110782365B (en) * | 2019-09-26 | 2022-04-29 | 中国神华能源股份有限公司国华电力分公司 | Parameter optimization interval configuration method and device, electronic equipment and storage medium |
| CN110989360A (en) * | 2019-12-23 | 2020-04-10 | 武汉博晟信息科技有限公司 | Thermal power generating unit steady-state history optimizing method based on full data |
| CN116244916A (en) * | 2022-12-29 | 2023-06-09 | 北京京桥热电有限责任公司 | Working condition optimizing method for gas generator set |
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