CN103208035A - Energy-saving dispatching optimization method for sets - Google Patents

Abstract

The invention relates to an energy-saving dispatching optimization method for sets and belongs to power plant set dispatching methods. The energy-saving dispatching optimization method comprises selecting sets with lowest coal consumption for prior calling, obtaining coal consumption superior and inferior values through a consumption difference analysis method, and calculating the coal consumption of a certain set at a certain moment; and when sets with the lowest coal consumption is more than one, adopting the optimal set with superior CO2 emission in the sets. According to the energy-saving dispatching optimization method, through research and testing, energy saving and emission reduction, reduction of coal consumption and optimization dispatching are achieved, and direct and indirect economic benefits are achieved, so that economic benefits of power plant sets are fully improved.

Description

Unit energy-saving distribution optimization method

Technical field

The invention belongs to the Power Plant dispatching method.

Background technology

The comparison morning that western countries carry out for experiment and the research work of unit performance, the software system function that early stage design forms is fairly simple, and is mainly used in guaranteeing unit peace individual character aspect, comprises the supervision of operational factor, the record of historical data, operating index overload alarm etc.Nineteen seventies, western countries such as the U.S., Canada just begin to test the unit heat economy on-line analysis system, adopt thermal deviation analytic approach in-service monitoring and analytical calculation unit hear rate to change, thereby instruct unit to adjust the operation of some controllable parameters, cut down the consumption of energy, as steam turbine power generation unit AID status monitoring and the diagnostic system of U.S.'s Westinghouse Electrical Corp. development.

American-European countries is to the research of power plant optimization aspect and use the stage that has been in comparative maturity.Germany and the U.S. have the experience of more than ten years aspect the optimum management of large thermal power plant on-line operation.Operation optimum management system as German Siemens company can in real time, dynamically instruct the workman to operate, and equipment is moved under the optimization situation.The external advanced software systems that drop into commercial operation have functions such as the on-line analysis of unit economy energy, running status diagnosis, the judgement of equipment component performance decline situation mostly.

It is later that China introduces external large electric power plant unit, slower to the experimental study starting of unit performance aspect.And the work of beginning mainly concentrates on the device security aspect, and the research that relates to overall performance and performance driving economy is less, and simultaneously because the home-made machine assembly is equipped with the defective of early stage DCS system, system's design and installation difficulty is bigger.Up to the beginning of the nineties, along with improving constantly of power station operation level, the security of power station equipment has had enough safeguards, just rises gradually about the research of unit running optimization, and a part is also arisen at the historic moment in conjunction with the operation optimization system of China's fired power generating unit present situation exploitation simultaneously.

The Energy Loss Analysis method of being used widely in the power plant units economic analysis is the power consumption analysis method.Usually adopt net coal consumption rate, heat consumption rate or unit total power production cost as the overall target of estimating unit performance." thermal deviation method " and " power consumption analysis diagnostic method " are the eighties propositions and be applied to produce reality, and its basic thought is that performance driving economy index deviation is decomposed step by step, thereby obtains the energy loss that every deviation causes.

Load at present unit and optimize to divide a timing, usually obscure these two different concepts of unit coa consumption rate and coal consumption amount easily, and then draw some wrong conclusions in application when it is analyzed, this paper has carried out careful elaboration on this question.

Coa consumption rate is an important indicator estimating unit economy, and the unit coa consumption rate is more little, and economy is just more high.The unit coa consumption rate is tried to achieve by coal consumption amount generally speaking.Its relational expression is:

b _i＝F _i/R _i

Wherein: b _i--be the coa consumption rate of unit;

F _i-be the coal consumption amount of unit;

P _i-be the load of unit correspondence.

As everyone knows, the research of energy saving for power plants tuning has 60 years of development history, the efficient method of main theory method, dynamic programming, etc. little gaining rate method etc.There is certain shortcoming in the distribution of domestic many genset energy-saving distribution system according to being the coal consumption curve that draws according to real time data, and is big and many as the desired data amount, and Data Source deficient in stability, accuracy are relatively poor.

Power consumption analysis claims the energy loss analysis again, is the analytical approach that the operating index deviation is decomposed step by step.Basic ideas be the total departure of unit net coal consumption rate be decomposed into each index deviation influence the item sum; Then at the influence factor of every deviation, further with each minute index the operation deviation be decomposed into various operation bias factors influence the item sum.Finally draw concrete reason, place and scale thereof that the operation energy loss produces.

The distribution of consumption difference

Total coal consumption deviation is in the coal consumption difference of fired power generating unit under actual operating mode and benchmark operating condition.Reasonable distribution to the total consumption of coal deviation is conducive to find out operational factor to coal consumption effect size, and determines respectively to move the occurrence positions of bias factor (operational factor and this operational factor reference value) influence item, is conducive to the expansion that operation is instructed.The operation bias factor influences the difference that item is defined as the coal consumption of unit when the coal consumption under the actual motion value moves under one parameter operation reference value with the supposition unit.Each operational factor is all done about moving the calculating of factor affecting item, and like this, total coal consumption deviation just can implement to the variation of each operational factor, just goes in each influence item.

The power consumption analysis computation model

In order to guarantee operation optimization guidance system real-time, need realization parameter and performance index to the online rapid calculation of unit net coal consumption rate influence degree, introduce the poor coefficient k of consumption _El, will be to consuming poor Δ b ^sCalculating be converted into k _ElCalculating: Δ b ^s=Δ xk _ElB ^Bas, g/KWh.

Wherein: the difference of Δ x--parameter x actual value and reference value;

k _El-consumption difference coefficient is defined as operational factor unit change amount to the contributive rate of unit net coal consumption rate;

b ^Bas-unit net coal consumption rate reference value.

The Δ b here ^sBe expressed as and suppose that when having only a parameter to change, this parameter changes the item that influences to coal consumption.According to following formula, consumption difference coefficient k _ElCalculating can adopt boiler efficiency method, steam turbine hear rate method, equivalent enthalpy drop method and unit power supplying efficiency method etc.

1), boiler efficiency method

The boiler efficiency method is according to boiler efficiency η _ElComputing formula, mainly concentrate on the calculating that boiler side and the relevant operational factor of burning consumption is differed from coefficient.

To boiler efficiency η _ElAnti-EQUILIBRIUM CALCULATION FOR PROCESS formula carries out differentiate and calculates, and then obtains following relationship:

Δ _ηel＝-(Δq ₂+Δq ₃+Δq ₄+Δq ₅+Δq ₆)

Ask for the consumption difference coefficient of the coal consumption influence of parameter carbon monoxide content changes delta CO below:

Under the situation of the influence of only considering carbon monoxide, to inflammable gas incomplete combustion loss Δ q ₃The computing formula differentiate, can obtain:

${\mathrm{\Δq}}_3=\frac{126.36\·V_{\mathrm{gy}}}{Q_r}\mathrm{\ΔCO}$

V wherein _GyBe the dry flue gas volume, the variable quantity that can get carbon monoxide content to the consumption difference coefficient of coal consumption is: In like manner can calculate exhaust gas temperature θ _PyThe consumption difference coefficient that the variable effect coal consumption changes

Here K _PyIt is 1 ° of C thermal loss of the every variation of boiler temperature modified value.Use the boiler efficiency method and can calculate exhaust gas temperature, oxygen amount, unburned carbon in flue dust, the isoparametric consumption difference of carbon monoxide content coefficient.

2), steam turbine hear rate method

Similar with the boiler efficiency method, utilize the basic representation of steam turbine heat consumption rate here:

$q=\frac{{3600T}_H}{(T_H-T_L){\mathrm{\η}}_{\mathrm{oi}}{\mathrm{\η}}_m{\mathrm{\η}}_g}$

Wherein: T _HThe average endothermic temperature of-thermodynamic cycle;

T _LThe average exothermic temperature of-thermodynamic cycle;

η _Oi, η _m, η _g--steam turbine internal efficiency, unit mechanical efficiency, efficiency of generator.

To the formula differentiate: $\frac{\mathrm{\Δq}}{q}=-\frac{T_L}{(T_H-T_L)T_H}{\mathrm{\ΔT}}_H+\frac{1}{T_H-T_L}{\mathrm{\ΔT}}_L-\frac{1}{{\mathrm{\η}}_{\mathrm{oi}}}\mathrm{\Δ}{\mathrm{\η}}_{\mathrm{oi}}$

Obtain T thus _H, T _L, η _OiConsumption difference coefficient about coal consumption:

$k_{T_H}=-\frac{T_L}{(T_H-T_L)T_H}$

$k_{T_L}=\frac{1}{T_H-T_L}$

$k_{{\mathrm{\η}}_{\mathrm{oi}}}=-\frac{1}{{\mathrm{\η}}_{\mathrm{oi}}}$

To concrete operational factor, can carry out local linearization to the associated change curve of this operational factor variable quantity and above-mentioned three parameters, find out Δ x and Δ T _H, Δ T _LOr Δ η _OiProportionate relationship, find the solution according to formula then.

The main unit parameter of using the calculating of power consumption analysis method mainly comprises: main steam pressure, main steam temperature, reheater crushing, reheat steam temperature, exhaust steam pressure etc.

3), equivalent enthalpy drop method

Equivalent enthalpy drop method is a kind of computing method of partial Quantitative Analysis.The characteristics of equivalent heat drop are: thermal technology's clear concept of local operation, and in full accord with one thermodynamic analysis; Secondly, calculates simple and directly, accurate, conform to suitable zooming with true therrmodynamic system.These characteristics of Equivalent Entropy Drop Method just its on-line monitoring and analysis to the unit economy energy have special significance.Based on the generation of thermal power plant's Quantitative Analysis of Thermal System universal model of Equivalent Entropy Drop Method, make the programing work that adopts Equivalent Entropy Drop Method to carry out on-line monitoring become convenient in recent years.

Utilize equivalent enthalpy drop method can derive the variation of steam turbine heat consumption rate, its expression formula is:

$\frac{\mathrm{\Δq}}{q}=\frac{\mathrm{\Δb}}{b}=\frac{{\mathrm{\ΔQ\η}}_i-{\mathrm{\ΔH}}_o}{H_o}$

In the formula: η _i-steam turbine efficient;

Δ Q-parameter changes the variation of the caloric receptivity that causes;

H _oThe equivalent enthalpy drop of-initial steam;

Δ H _o--the variation of the equivalent enthalpy drop that parameter transformation causes.

Parameter changes caloric receptivity Q and steam equivalent enthalpy drop H _oVariation also can derive by equivalent enthalpy drop method, calculate rendering parameter and Δ Q, Δ H _oRelation curve and curve carried out linearization processing, obtain this operational factor and Δ Q, Δ H _oFunction of first order corresponding relation, substitution following formula are asked for the consumption difference coefficient about this operational factor.

The consumption difference coefficient that adopts equivalent enthalpy drop method to calculate has:

Main, steam and steam turbine again: superheater spray water flux, reheater desuperheating water flow, continuous blowdown flow, high pressure cylinder efficient, intermediate pressure cylinder efficient, low pressure (LP) cylinder efficient, shaft gland steam leakage, secondary air amount;

Water supply system: poor, the at different levels crushing that draws gas of the upper and lower side of feed temperature, high-pressure heaters at different levels, the little steam turbine steam consumption of feed pump;

Condensate system: poor, the at different levels crushing that draws gas of the upper and lower side of condenser supercooling degree, supplementing water flow, low-pressure heaters at different levels;

Changes of operating modes: the high pressure turbine by of the excision of high-pressure heater, water supply system bypass, main steam.

4), unit power supplying efficiency method

The expression formula of unit power supplying efficiency is: ${\mathrm{\η}}_{\mathrm{cp}}^n=\frac{1}{b_s}=\frac{{3600P}_e(1-{\mathrm{\ξ}}_{\mathrm{ap}})}{Q_{\mathrm{cp}}}$

In the formula: R _e-electric power; Q _Cp-unit hear rate; ξ _Ap-station service power consumption rate.

Station service power consumption rate ξ _ApChanging the coal consumption that causes is changed to

Then the consumption difference coefficient about station service power consumption rate is

Using the unit efficiency method can be used for determining: station service power consumption rate or its ingredient (as each blower fan power consumption, coal pulverizer power consumption, water circulating pump power consumption, condensate pump power consumption) are to the influence of net coal consumption rate.

Determining of initial baseline value

The initial baseline value has comprised each performance index and the operational factor of current optimized running situation.Determining based on design load and reference test value of initial value, (partial parameters value variable working condition weighted calculation obtains, and finally forms the initial value data storehouse).Every index and operational factor are done following classification according to definite method:

Design load: poor, the at different levels crushing that draws gas of the upper and lower end of main steam temperature, reheater crushing, shaft-packing leakage amount, secondary air amount, high-pressure heaters at different levels, condenser supercooling degree, supplementing water flow, the crushing that draws gas at different levels, EAT etc.

Trial value: net coal consumption rate, steam turbine hear rate, station service power consumption rate, main steam pressure, reheat steam temperature, superheater spray water flux, high pressure cylinder efficient, intermediate pressure cylinder efficient, low pressure (LP) cylinder efficient, feed temperature, the little steam turbine steam consumption of feed pump, condensate pump power consumption, exhaust gas temperature, oxygen amount, unburned carbon in flue dust, carbon monoxide content, each blower fan power consumption, coal pulverizer power consumption etc.

Major parameter calculates net coal consumption rate

If the variable quantity of a certain parameter is Δ M, the coal consumption of boiler benchmark is b before changing, and keeps other parameter constants, calculates every thermal loss and thermal efficiency b+ Δ b after changing, therefore wherein Δ b is caused by Δ M, and can obtain this parameter unit change amount influences amplitude, ao b/ Δ M to the unit coal consumption.Adopting uses the same method can obtain all parameters variations to the amplitude that influences of net coal consumption rate.

Based on CO ₂Method is calculated the discharge capacity energy-saving distribution

Carbon dioxide comprises 1 carbon atom and 2 oxygen atoms, and molecular weight is 44 (C-l2, O-16).It is a kind of colorless and odorless gas that carbon dioxide is depressed at the normal temperature band, contains 1% carbon dioxide of having an appointment in the air.Liquid carbon and solid carbon are the chief components of biosome (component of animals and plants) and mineral fuel (rock gas, oil and coal).(molecular weight of C is that the molecular weight of 12, CO2 is 44,44/12=3.67) to produce about 3.67 tons of carbon dioxide after one ton of carbon burns in oxygen.

Having only generating electricity from manpower factory is the fossil energy of burning, just can produce carbon dioxide, and China be based on generating electricity from manpower country (according to statistics, whole nation generating total amount 2.83 trillion kWh in 2006, wherein people's electricity accounts for 83.2%, and water power accounts for 14.7%), simultaneously, the basic top of employed fuel, fuel-burning power plant is coal (big right gas and oil that fraction is arranged), and 49% of national consumption of coal total amount is used for generating.

Current, China's power generation dispatching is to send out [2007] No. 53 literary compositions " energy-saving power generation dispatching way " according to the Office of the State Council to carry out, and unit generation tagmeme table thermal power generation unit of the same type sorts energy conservation priority from low to high according to energy consumption level; When energy consumption level is identical, sort from low to high according to pollutant emission level.

CO2 emissions calculate

Carbon consumption is calculated in the coal-burning power plant, and establishing the electricity volume of being sent out every day the coal-burning power plant is P, and every big coal amount that consumes is B, converts the rate of standard coal consumption that can draw every degree electricity under the standard thermal value according to its net calorific value.Owing in the coal various elements are arranged, carbon content is just a part of, by industrial ultimate analysis, all is benchmark with the as received basis.Must reject the content that just draws carbon behind the various elements such as full moisture content contained in the coal, ash, fugitive constituent, element sulphur when calculating its carbon content.Because constituent contents such as hydrogen, nitrogen, oxygen are lower, easy to draw formula as follows after ignoring its influence in order to analyze herein

Carbon content=100-(moisture+ash content+volatile matter)-sulfur content.(1)

The carbon dioxide volume that produces

According to Theory of Combustion, the perfect combustion reaction equation of carbon is

C+O ₂＝CO ₂，

Namely will to produce volume be T to 1 mole of (12kg) carbon ₀* R/p ₀=22.4 (m ³) carbon dioxide (T ₀And P ₀Be gas absolute temperature and the pressure under the standard state; R is ideal gas constant).

Owing to substantially all change into carbon dioxide after the carbon burning, in addition, also have a spot of carbon imperfect combustion generation CO gas in stove to enter atmosphere with flue gas effusion boiler in the fuel.But consider that these carbon monoxide finally will be oxidized to carbon dioxide, therefore, this paper also is included into this a spot of carbon in the carbon amount of boiler combustion generation carbon dioxide.So the carbon dioxide volume that the carbon consumption of unit quantity of electricity is discharged is

$V_{{\mathrm{CO}}_2}=\frac{22.4}{12}{\mathrm{Bm}}_{\mathrm{Car}}(m^3/h),---\left(2\right)$

In the formula: m _CarBe the carbon content in the coal.

Consider heat loss due to incomplete combustion's correction

By Theory of Boiler Combustion as can be known, there is the heat loss due to incomplete combustion in the boiler coal burning.The carbon that enters boiler not exclusively exists because of oxidizing fire, fail fully to be converted to carbon dioxide, and still taken out of burner hearth and enter furnace hopper by flue gas with the form of carbon granule, there is inaccuracy so formula (2) directly consumes carbon amount calculating emission amount of carbon dioxide according to unit, should rejects this part in the actual metered.

Unburnt carbon total amount in the ashes (comprising slag and flying dust)

Theoretical dust burdening in the coal is

m _A＝B×/m _Aar

In the formula: m _ABe the theoretical total content of ash in the coal, t.

According to the grey balance principle as can be known: the total grey amount in the burner hearth fuel of entering should equal the ash amount sum in flying dust and the lime-ash.By the empirical data of actual measurement, the ratio that produces flying dust after the boiler combustion accounts for 90% of lime-ash total amount, and the slag content that produces accounts for 10% of lime-ash total amount, and unburned carbon in flue dust and ash content carbon refer to simple mass ratio.Flying dust carbon containing, lime-ash carbon containing should be pure carbons, and flying dust and grey quantity of slag sum should be the total content of ash in the coal, namely

m _A＝m _Af+m _Az

In the formula: m _AfBe flying dust amount, t; m _AzBe the grey quantity of slag, t.

Unburned carbon in flue dust is

$M_{\mathrm{Fc}}=\frac{m_{\mathrm{cf}}}{{\mathrm{BA}}_f+m_{\mathrm{cf}}}$

Ash content carbon is

$m_{\mathrm{Zc}}=\frac{m_{\mathrm{lz}}}{{\mathrm{BA}}_z+m_{\mathrm{lz}}}$

In the formula: m _LzBe lime-ash carbon containing total amount, t; m _CfBe the carbon containing total amount in the flying dust, t.

Total carbon content is in the ash

$m_{C_1}\≈m_{\mathrm{lf}}+m_{\mathrm{lz}}$

Namely $m_{C_1}=\frac{{\mathrm{BA}}_f{m}_{\mathrm{Fc}}}{1-m_{\mathrm{Fc}}}+\frac{{\mathrm{BA}}_z{m}_{\mathrm{Zc}}}{1-m_{\mathrm{Zc}}}---\left(3\right)$

The calculating of unburned carbon in flue dust and ash content carbon

Because boiler design and combustion conditions are different, the unburned carbon in flue dust of every boiler and ash content carbon are all different because ash content carbon can not onlinely detect, manual analysis not only lag behind and also the cycle longer.And by the on-line monitoring unburned carbon in flue dust, it is little to fluctuate substantially when operating condition is stablized.According to list of references [7]: to a certain concrete boiler, as the Q of boiler ₂, Q ₃, Q ₅, Q ₆4 thermal loss with Σ Q _iWhen equaling some special values, boiler is the amount of carbon dioxide and the mechanical imperfect combustion thermal loss Q that discharge of the unit's of confessing net heat whenever ₄Irrelevant, only be decided by the ratio of the fuel used carbon content of this boiler and net calorific value.So unburned carbon in flue dust, ash content carbon can be chosen the mean value of historical record.

When not considering to leak coal and other heat loss due to combustibles in refuses, can draw its mean value according to above-mentioned 3 formulas.

Revise the calculating of back carbon emission total amount

Can get actual carbon amount of burning in the furnace coal weight according to formula (1) and formula (3)

For

$m_{C_2}={\mathrm{Bm}}_{\mathrm{Car}}-m_{C_1}=B(m_{\mathrm{Car}}-\frac{m_{\mathrm{Af}}{m}_{\mathrm{Fc}}}{1-m_{\mathrm{Fc}}}-\frac{m_{\mathrm{Az}}{m}_{\mathrm{Zc}}}{1-m_{\mathrm{Zc}}})$

The carbon dioxide volume that produces is

${C_{C{O}_2}}^{\′}=\frac{22.4}{12}{m}_{C_2}=\frac{22.4B}{12}(m_{\mathrm{Car}}-\frac{m_{\mathrm{Af}}{m}_{\mathrm{Fc}}}{1-m_{\mathrm{Fc}}}-\frac{m_{\mathrm{Az}}{m}_{\mathrm{Zc}}}{1-m_{\mathrm{Zc}}})$

The discharge capacity of unit quantity of electricity carbon dioxide is

${\stackrel{\‾}{V}}_{{\mathrm{CO}}_2}=\frac{{V_{{\mathrm{CO}}_2}}^{\′}}{P_{\mathrm{rd}1}}$

In the formula,

Carbon emission amount for unit quantity of electricity.Expectation carbon emission total amount during dispatching of power netwoks unit is

${V_{{\mathrm{CO}}_2}}^{\′\′}={\stackrel{\‾}{V}}_{{\mathrm{CO}}_2}\×P_e.---\left(4\right)$

The machine unit scheduling mode exists a lot of weak points simultaneously in the frequency quality that improves electrical network at present, it is careful inadequately namely the economic performance difference between each unit to be considered, when needing increasing and decreasing load because of frequency modulation its instruction increment adjustable allowance between the distribution between each unit is often according to each Power Plant allocate voluntarily, principle distribution load such as the deviation of year generating completion rate, actual load and plan load, contract electricity price, scheduling is then because the economic performance data of each unit of shortage and can not effectively accomplish economy, energy-conservation scheduling.

Reducing coa consumption rate is the needs of fuel-burning power plant existence, produces, enhances productivity, optimizes allocation of resources in order to keep considerable competitive power to press for optimization, and its meaning is very great.

Summary of the invention

The invention provides a kind of unit energy-saving distribution optimization method, poor to solve the energy-saving effect that exists in the present unit energy-saving distribution, reach the problem that pollutant emission is not optimized.

The technical scheme that the present invention takes is: comprise the following steps:

One, select the minimum unit of coal consumption preferentially to call, obtain the good and bad value of coal consumption by the power consumption analysis method, influence the coal consumption parameters calculated and take following 12 parameters: main steam temperature, main steam pressure, reheat steam temperature, reheated steam pressure, unburned carbon in flue dust, hot desuperheating water mass rate, overheated desuperheating water mass rate, generator power, station service power consumption rate, exhaust gas temperature, oxygen content in exhaust smoke, feed temperature again, according to the influence degree of these 12 parameters of calculating to coal consumption, thereby calculate the coal consumption amount that certain unit is carved at a time;

Two, when the minimum unit of coal consumption amount surpasses one, then take CO in the unit ₂The optimum unit of discharge capacity.

By using the present invention, can carry out unit energy saving optimizing scheduling mode at any time, carry out distribution load according to qualifications, how the optimal allocation load is made certain technological guidance for the dispatcher.Make operations staff and dispatcher break away from a large amount of, loaded down with trivial details data statistics and analytical work, and can analyze the rationality that network load distributes fully and effectively, indirect economic benefit is very considerable.

Patent of the present invention is tested after deliberation, has realized energy-saving and emission-reduction, reduces coal consumption, optimizes the purpose of scheduling, has obtained directly and indirect economic benefit; Make the economic benefit of Power Plant be able to sufficient raising; and make the management and running personnel full of confidence to how to optimize distribution load; make the dispatcher collect the most real unit coal consumption parameter in real time; simultaneously for implementing national energy-saving and emission-reduction strategy; improve unit efficiency; reduce CO2 emission, promote environmental protection.Enforcement of the present invention makes scheduling in optimization monitoring market proven technique support more arranged, and has increased stability and the reliability of machine unit scheduling distribution load simultaneously, and method is provided for unit is energy-saving and cost-reducing.

Embodiment

One, select the minimum unit of coal consumption preferentially to call, obtain the good and bad value of coal consumption by the power consumption analysis method, influence the coal consumption parameters calculated and take following 12 parameters: main steam temperature, main steam pressure, reheat steam temperature, reheated steam pressure, unburned carbon in flue dust, hot desuperheating water mass rate, overheated desuperheating water mass rate, generator power, station service power consumption rate, exhaust gas temperature, oxygen content in exhaust smoke, feed temperature again, according to the influence degree of these 12 parameters of calculating to coal consumption, thereby calculate the coal consumption amount that certain unit is carved at a time;

Two, when the minimum unit of coal consumption amount surpasses one, then take CO in the unit ₂The optimum unit of discharge capacity.

Applicable cases:

The Datang Changchun second thermoelectric Ltd 4, No. 5 boilers are the Harbin Boiler Plant HG-670/13.7-YM9 type UHV (ultra-high voltage) of producing, resuperheat Natural Circulation, dry ash extraction pulverized coal firing boiler.4, every stove of No. 5 boilers is furnished with warehouse formula ball mill pulverizing systems in the middle of 2 covers, and combustion system adopts four jiaos, two circle of contact, single flow combustion system.

2012, for studying the power generation dispatching mode in existing Jilin Province, carry out the energy-saving power generation dispatching research work, our factory cooperates Jilin Electric Power Supply Company China Electric Power Research Institute actively to carry out energy-saving and emission-reduction scheduling research, with regard to 2012,4, No. 5 units are dispatched generating according to the coal consumption level, the low unit of coal consumption is multiple, the high unit of coal consumption is sent out less or is not sent out, monitoring CO when adopting the low unit of coal consumption ₂Discharge capacity through the operation practice, has obtained good economic benefits and social benefit.

As calculated with statistics, No. 4 average net coal consumption rates of stove are 292.499/kWh (average load 12.5lMW), No. 5 average net coal consumption rates of stove are 302.339/kWh (average load 12.56MW), No. 4 relative No. 5 stoves of stove coal consumption level omit, therefore, according to machine unit scheduling technical research method, No. 4 low units of coal consumption should be multiple with respect to No. 5 units that are all 2OOMW, therefore, use this project, under little situation, No. 4 unit whole year operation hourage reaches 5391.55h in load difference, No. 5 unit whole year operation hourage reaches 4194.13h, be compared to unit No. 5, No. 4 unit has moved 1197.42h more, has obtained good economical operation effect.Unit Study on energy saving project provides reference and foundation for energy-saving power generation dispatching, the different coal consumption difference between the identical unit of analysis capacity and the justice of carrying out, just energy-saving distribution generating to seek to reduce coal consumption, energy-saving power generation dispatching research has great importance.The research of this project has improved economic benefit and the social benefit of genset greatly.Simultaneously, the present invention can direct scheduling concretely and the operations staff carries out selection generating with good conditionsi between the same capability unit, and effectively energy savings makes the set optimization scheduling become possibility.

Claims (1)

1. a unit energy-saving distribution optimization method comprises the following steps:

(1), select the minimum unit of coal consumption preferentially to call, obtain the good and bad value of coal consumption by the power consumption analysis method, influence the coal consumption parameters calculated and take following 12 parameters: main steam temperature, main steam pressure, reheat steam temperature, reheated steam pressure, unburned carbon in flue dust, hot desuperheating water mass rate, overheated desuperheating water mass rate, generator power, station service power consumption rate, exhaust gas temperature, oxygen content in exhaust smoke, feed temperature again, according to the influence degree of these 12 parameters of calculating to coal consumption, thereby calculate the coal consumption amount that certain unit is carved at a time;

(2), when the minimum unit of coal consumption amount surpasses one, then take CO in the unit ₂The optimum unit of discharge capacity.