CN107679018A - A kind of poor computational methods of coal-burning power plant limit coal unit price - Google Patents
A kind of poor computational methods of coal-burning power plant limit coal unit price Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 208
- 238000000205 computational method Methods 0.000 title claims abstract description 19
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000005864 Sulphur Substances 0.000 claims abstract description 23
- 238000012423 maintenance Methods 0.000 claims abstract description 14
- 230000008439 repair process Effects 0.000 claims abstract description 11
- 230000006866 deterioration Effects 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 19
- 239000011593 sulfur Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 230000008859 change Effects 0.000 claims description 16
- 238000006477 desulfuration reaction Methods 0.000 claims description 12
- 230000023556 desulfurization Effects 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 11
- 239000003546 flue gas Substances 0.000 claims description 10
- 230000004907 flux Effects 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 9
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 7
- 239000010440 gypsum Substances 0.000 claims description 7
- 229910052602 gypsum Inorganic materials 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 6
- 235000019738 Limestone Nutrition 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 5
- ONUFESLQCSAYKA-UHFFFAOYSA-N iprodione Chemical compound O=C1N(C(=O)NC(C)C)CC(=O)N1C1=CC(Cl)=CC(Cl)=C1 ONUFESLQCSAYKA-UHFFFAOYSA-N 0.000 claims description 5
- 239000006028 limestone Substances 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000013215 result calculation Methods 0.000 claims description 2
- 241000790917 Dioxys <bee> Species 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 claims 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 claims 1
- 238000002474 experimental method Methods 0.000 claims 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 5
- 230000002349 favourable effect Effects 0.000 abstract description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000005201 scrubbing Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011234 economic evaluation Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
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Abstract
The invention discloses a kind of poor computational methods of coal-burning power plant limit coal unit price.Use low calorific value coal and high sulphur content coal is common method that power plant reduces fuel cost, reduced with fuel cost on the contrary, burning inferior coal can cause the increase of power plant's operating cost；There has been no reliable method at present to calculate influence of the ature of coal deterioration to power plant's operating cost.Net coal consumption rate, the increase of desulphurization system cost when the present invention is according to the raw coal unit price after ature of coal deterioration, raw coal caloric value, crew base net coal consumption rate, unit burning inferior coal, the increase of denitrating system cost, the increase of repair and maintenance cost calculate that marginal coal unit price is poor, so as to draw influence of the ature of coal deterioration to power plant's operating cost.If marginal coal unit price difference, which is more than mark coal procurement price, reduces amplitude, burning inferior coal is unfavorable to economy of power plant；If marginal coal unit price difference, which is less than mark coal procurement price, reduces amplitude, burning inferior coal is favourable to economy of power plant.
Description
Technical field
The invention belongs to coal-burning power plant coal combustion technology field, it is related to coal-burning power plant and grades poor quality from low heat value, high-sulfur
Economy computational methods during coal, the specifically a kind of poor computational methods of coal-burning power plant limit coal unit price.
Background technology
With being significantly increased for regenerative resource installed capacity in recent years, the year generating hourage of coal-burning power plant year by year under
Drop, coal-burning power plant face cost rise, and survival pressure becomes the problem of big.To improve economy of power plant benefit, many power plant actively fire
With colm to reduce fuel cost.
The leading indicator for influenceing coal price is caloric value and sulfur content, it is however generally that caloric value is lower, and it marks coal unit price
Also can be lower；And sulfur content raises, it is marked coal unit price and can reduced.Therefore, it is that power plant reduces to use low calorific value coal and high sulphur content coal
The common method of fuel cost.
But coal-fired calorific value, which reduces, can influence unit output, while boiler efficiency can be caused to decline, station service power consumption rate rises,
So that net coal consumption rate rises；In addition, Coal-fired capacity can be increased by using low calorific value coal, standby mill may need to be enabled, add inspection
Repair maintenance cost.Sulphur content increase can cause former sulfur dioxide in flue gas content to rise in coal, so that unit scrubbing CO_2
The increase of investment operation expense, in addition, the aggravation of sulphur content rise the problems such as causing high temperature corrosion, can also increase unit inspection
Repair maintenance cost.Therefore, reduced with fuel cost on the contrary, burning inferior coal can cause the increase of power plant's operating cost.
There has been no reliable method at present to calculate influence of the ature of coal deterioration to power plant's operating cost.
The content of the invention
In view of the above-mentioned problems of the prior art, the present invention provides a kind of coal-burning power plant limit coal unit price poor calculating side
Method, to calculate influence of the ature of coal deterioration to power plant's operating cost.
Therefore, the present invention is realized by following technical proposals：A kind of calculating side of coal-burning power plant limit coal unit price difference
Method, it passes through the raw coal unit price of colm, raw coal caloric value, mark calorific value of coal, unit benchmark net coal consumption rate, unit burning inferior coal
When net coal consumption rate, desulphurization system cost value added, denitrating system cost value added and repair and maintenance cost value added calculate combustion
With influence of the colm to power plant's operating cost, calculation formula such as following formula：
In formula, a is that marginal coal unit price is poor, i.e., the mark coal price lattice converted for operating cost increase caused by being deteriorated as ature of coal
Value added, unit are member/t；p1For the raw coal unit price of colm, unit is member/t；QsTo mark the net calorific value as received basis of coal,
That is 29270kJ/kg；Q1For the net calorific value as received basis of raw coal, unit kJ/kg；bg0Powered for unit rated load benchmark
Coal consumption, i.e. the rated load net coal consumption rate under conventional coal, unit g/kwh；bg1For burning inferior coal when unit power supply
Coal consumption, unit g/kwh；X is coal consumption rate of change correction factor, Δ asRepresent desulphurization system cost value added, Δ anFor denitration system
System cost value added, Δ afFor repair and maintenance cost value added.
Further, the index of the ature of coal deterioration includes the caloric value reduction of coal and sulphur content improves.
Further, bg1According to performance test, tested and tied by boiler thermal output, turbine heat rate rate and coal-burning power plant's power consumption rate
Fruit is calculated.
Further, the value added b of net coal consumption rate after ature of coal deterioratesg1-bg0Only consider boiler efficiency change, spray water flux
Change and three big blower fan and coal pulverizer power consumptions change the influence to net coal consumption rate, are shown below：
In formula, Δ ηbFor the difference of boiler efficiency changing value, the i.e. boiler efficiency of burning inferior coal and benchmark boiler efficiency；
ηb1For the boiler efficiency of burning inferior coal；ΔqiFor spray water flux changing value, including superheater at different levels and reheater spray water flux,
Unit is t/h；xiFactor of influence for spray water flux to coal consumption；ΔζiFor the changing value of every subsidiary engine station service power consumption rate, mainly include
The power consumption of three big blower fans and coal pulverizer, %；ζ0For unit benchmark station service power consumption rate, %.
Further, when unit actual load is close to rated load, x takes 1；When unit actual load and rated load
When deviation is larger, the correction factor is determined according to result of the test, and the calculation formula of marginal coal unit price difference is modified.
Further, described Δ asCompared to the increased desulphurization cost of conventional coal is used after being deteriorated for ature of coal, refer to
Sulfur content in coal amount increase causes the increase of the investment operation expense of unit scrubbing CO_2, wherein, the sulphur content in coal is near
Seemingly think the sulfur dioxide being completely converted into flue gas.
Further, when sulfur content in coal amount is constant, Δ asFor 0.
Further, when desulphurization system is conventional desulfurization by lime gypsum method system, taken off caused by ature of coal sulphur content increase
Shown in the increased computational methods following formula of sulphur cost：
In formula, the Δ as,caoWithThe incrementss of lime stone and water respectively needed for desulfurization slurry raw material, Δ
as,cFor the increase of catalyst cost, i.e., catalyst is added when sulphur content content is higher in ature of coal, it is necessary in slurries to increase desulfurization
Efficiency, the Δ as,PDesulphurization system power consumption increase caused by being deteriorated for ature of coal, mainly include the increase of slurry circulating pump power consumption, increase
Pressure fan power consumption increases and desulphurization system other power consumptions increase.
Further, desulphurization system cost value added Δ asBy following formula approximate estimation, Δ as=y Δs S, the y are desulfurization system
System cost factor, unit are member/(t*1% sulfur content)；Δ S be sulfur content in coal amount changing value, unit %.
Further, denitrating system cost value added Δ anFor compared to using, conventional coal is increased to be taken off after coal varitation
Nitre cost, it is contemplated that nitrogen oxide emission influence of the coal varitation on former flue gas is relatively small, takes Δ anEqual to 0.
The coal-burning power plant limit coal unit price difference that the present invention is calculated is marked coal procurement price after being deteriorated with ature of coal and reduced
Amplitude compares；If marginal coal unit price difference, which is more than mark coal procurement price, reduces amplitude, burning inferior coal is to economy of power plant
It is unfavorable；If marginal coal unit price difference, which is less than mark coal procurement price, reduces amplitude, burning inferior coal is favourable to economy of power plant.
The present invention is the economic evaluation when grading colm from low heat value, high-sulfur to coal-burning power plant, draws ature of coal
Deteriorate the influence to power plant's operating cost.
Embodiment
The present invention is described in detail below by embodiment, but the present invention is not limited solely to following examples.
Embodiment
A kind of computational methods of coal-burning power plant limit coal unit price difference, the raw coal unit price after the deterioration of Main Basiss ature of coal, original
Net coal consumption rate, the increase of desulphurization system cost when calorific value of coal, crew base net coal consumption rate, unit burning inferior coal, denitration system
The items such as the increase of system cost, the increase of repair and maintenance cost calculate, as shown in (1) formula：
(1) in formula, a represents that marginal coal unit price is poor, i.e., the mark converted for operating cost increase caused by being deteriorated as ature of coal
The increase of coal price lattice, unit is member/t.
(1) in formula, p1For the raw coal unit price of colm, unit is member/t.
(1) in formula, QsTo mark the net calorific value as received basis of coal, i.e. 29270kJ/kg.
(1) in formula, Q1For the net calorific value as received basis of raw coal, unit kJ/kg.
(1) in formula, bg0For unit rated load benchmark net coal consumption rate, i.e., the rated load power supply coal under conventional coal
Consumption, unit g/kwh.
(1) in formula, bg1For burning inferior coal when unit net coal consumption rate, unit g/kwh.bg1Can according to performance test,
Obtained by boiler thermal output, turbine heat rate rate and station service power consumption rate test result calculations.
Preferably, ature of coal deterioration after net coal consumption rate value added bg1-bg0Boiler efficiency change, desuperheating water can only be considered
Amount change and three big blower fan and coal pulverizer power consumptions change the influence to net coal consumption rate, as shown in (2) formula.
(2) in formula, Δ ηbFor the difference of boiler efficiency changing value, the i.e. boiler efficiency of burning inferior coal and benchmark boiler efficiency
Value；ηb1For the boiler efficiency of burning inferior coal；ΔqiFor spray water flux changing value, including superheater at different levels and reheater desuperheating water
Amount, unit t/h；xiFactor of influence for spray water flux to coal consumption；ΔζiFor the changing value of every subsidiary engine station service power consumption rate, mainly
Include the power consumption of three big blower fans and coal pulverizer, %；ζ0For unit benchmark station service power consumption rate, %.
(1) in formula, x is coal consumption rate of change correction factor.When unit actual load is close to rated load, x takes 1；When
When unit actual load and larger rated load deviation, the correction factor can be determined according to result of the test, and (1) formula is repaiied
Just.
(1) in formula, Δ asRepresent desulphurization cost value added, i.e., it is increased de- compared to conventional coal is used after ature of coal deterioration
Sulphur cost, typically referring to sulfur content in coal amount increase causes the increase of investment operation expense of unit scrubbing CO_2.Its
In, the sulphur content in coal can be approximately considered the sulfur dioxide being completely converted into flue gas.
Preferably, when sulfur content in coal amount is constant, Δ asFor 0.
Preferably, by taking the desulfurization by lime gypsum method system of routine as an example, desulphurization cost caused by ature of coal sulphur content increase
Increased computational methods are as shown in (3) formula.
(3) formula, the Δ as,caoWithThe incrementss of lime stone and water respectively needed for desulfurization slurry raw material.
(3) formula, the Δ as,cIncrease for catalyst cost, i.e., when sulphur content content is higher in ature of coal, it is necessary in slurries
Catalyst is added to increase desulfuration efficiency.
(3) formula, the Δ as,PDesulphurization system power consumption increase caused by being deteriorated for ature of coal, mainly include slurry circulating pump electricity
Consumption increase, the increase of booster fan power consumption and desulphurization system other power consumptions increase.Other power consumptions of above-mentioned desulphurization system mainly include but
It is not limited only to limestone slurry liquid pump, lime stone slurry agitator, oxidation fan, gypsum excavationg pump, sulfur removal technology water pump, demister
Flush water pump, desulfurization reuse water pump, calcium plaster liquid pump, gypsum dehydration vavuum pump, gypsum dehydration flush water pump and gypsum dehydration area
The power consumption of domain slurry pool stirrer.
Preferably, desulphurization cost increase Δ asCan be by (4) formula approximate estimation, Δ as=y Δs S. (4)
Preferably, (4) formula, the y is the desulphurization cost factor, and unit is member/(t*1% sulfur content)；Δ S is to contain in coal
The changing value of sulfur content, unit %.
(1) formula, the denitration cost value added Δ anFor after coal varitation compared to using the increased denitration of conventional coal
Cost.Volatile matter content and the nitrogen element content change of coal can influence the discharged nitrous oxides of former flue gas, so as to cause to remove nitrogen
The change of the investment operation expense of oxide.
Preferably, relatively small, ordinary circumstance is influenceed on the nitrogen oxide emission of former flue gas in view of coal varitation
Under take Δ anEqual to 0.
Preferably, by taking selective catalytic reduction (SCR) denitrating flue gas of routine as an example, the increased calculating of denitration cost
Method is as shown in (5) formula.
Denitration cost increase=ammoniacal liquor consumption increase+spray ammonia system power consumption increase (5)
(1) formula, the Δ afFor the increase of repair and maintenance cost, i.e., ature of coal it is bad after it is increased compared to when using conventional coal
Repair and maintenance cost.After ature of coal is bad, easily cause heating surface wear aggravation, Boiler Furnace slagging and enable standby coal pulverizer etc. to ask
Topic, can increase repair and maintenance cost.
Application examples
By taking the subcritical coal units of certain 660MW as an example, analysis respectively uses low heat value colm and high sulphur content colm
Economy.
The unit net coal consumption rate is 319g/kWh, and when the unit uses low calorific value coal, coal burning caloricity often declines
100kcal/kg, net coal consumption rate increase 0.43g/kWh, mark coal unit price is with 700 yuan/ton of calculating；In addition, when coal burning caloricity declines
Standby coal pulverizer may need to be enabled, cause the increase of unit maintenance cost, often decline the inspection of 100kcal/kg units with coal burning caloricity
Accomplish 0.5 yuan/t of this increase calculating, then the monovalent difference of marginal coal caused by caloric value reduces 100kcal/kg is 1.44 yuan/t.Root
Counted according to 2014-2016 yearly correlations, caloric value often declines 100kcal/kg, and mark coal unit price fall is between 0.8-4 members/t
Fluctuation.When mark coal unit price fall is poor more than marginal coal unit price, uses low heat value coal and be advantageous to improve Unit Economic
Property；Otherwise it is unfavorable to unit economy to use low heat value coal.
When the unit uses high sulphur content colm, counted according to service data, sulfur content in coal amount often increases by 0.1%, desulfurization
SO in system entry flue gas2Concentration increase about 243mg/Nm3.Thus generator set desulfurization system increase can be calculated according to (3) formula
Cost be converted into mark coal price be 2.83-3.33 members/t；After coal sulphur content increase, if desulphurization system needs extra unlatching slurries
Circulating pump, marginal coal unit price difference increase is more, on the contrary then less.Simultaneously because the increase of sulfur content in coal amount, boiler heating surface
It is more prone to slagging, dust stratification, situations such as high and low temperature heating surface is also easier to that high temperature corrosion, low-temperature corrosion occurs, so as to cause
More equipment losses and boiler maintenance amount, calculated, then closed with 0.3 yuan/t of every increase by 0.1% sulphur content increase unit maintenance cost
The monovalent difference of marginal coal caused by counting sulfur content increase by 0.1% is 3.13-3.63 members/t.According to related system between 2014~2016 years
Meter, sulphur content often improve 0.1%, and mark coal unit price declines 2-6 members/t.When mark coal unit price fall is poor more than marginal coal unit price
When, use high sulphur content coal and be advantageous to improve unit economy；It is on the contrary then unfavorable to unit economy.
Claims (10)
1. the computational methods of a kind of coal-burning power plant limit coal unit price difference, it is characterised in that pass through the raw coal unit price of colm, original
Net coal consumption rate, desulphurization system cost when calorific value of coal, mark calorific value of coal, unit benchmark net coal consumption rate, unit burning inferior coal increase
Value added, denitrating system cost value added and repair and maintenance cost value added calculate shadow of the burning inferior coal to power plant's operating cost
Ring, calculation formula such as following formula：
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In formula, a is that marginal coal unit price is poor, i.e., the mark coal price lattice for operating cost increase conversion caused by being deteriorated as ature of coal increase
Value, unit is member/t；p1For the raw coal unit price of colm, unit is member/t；QsTo mark the net calorific value as received basis of coal, i.e.,
29270kJ/kg；Q1For the net calorific value as received basis of raw coal, unit kJ/kg；bg0For unit rated load benchmark power supply coal
Consumption, i.e. the rated load net coal consumption rate under conventional coal, unit g/kwh；bg1For burning inferior coal when unit power coal
Consumption, unit g/kwh；X is coal consumption rate of change correction factor, Δ asRepresent desulphurization system cost value added, Δ anFor denitrating system
Cost value added, Δ afFor repair and maintenance cost value added.
2. the computational methods of coal-burning power plant limit as claimed in claim 1 coal unit price difference, it is characterised in that the ature of coal is bad
The caloric value that the index of change includes coal reduces and sulphur content raising.
3. the computational methods of coal-burning power plant limit as claimed in claim 1 coal unit price difference, it is characterised in that bg1According to performance
Experiment, is obtained by boiler thermal output, turbine heat rate rate and coal-burning power plant's power consumption rate test result calculations.
4. the computational methods of coal-burning power plant limit as claimed in claim 1 coal unit price difference, it is characterised in that after ature of coal deterioration
The value added b of net coal consumption rateg1-bg0Only consider that boiler efficiency change, spray water flux change and three blower fans and coal pulverizer power consumption greatly become
Change the influence to net coal consumption rate, be shown below：
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<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
</munderover>
<msub>
<mi>&Delta;q</mi>
<mi>i</mi>
</msub>
<msub>
<mi>x</mi>
<mi>i</mi>
</msub>
<mo>+</mo>
<msub>
<mi>b</mi>
<mrow>
<mi>g</mi>
<mn>0</mn>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mfrac>
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<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
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<msub>
<mi>&Delta;&zeta;</mi>
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<msub>
<mi>&zeta;</mi>
<mn>0</mn>
</msub>
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<mo>)</mo>
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In formula, Δ ηbFor the difference of boiler efficiency changing value, the i.e. boiler efficiency of burning inferior coal and benchmark boiler efficiency；ηb1For
The boiler efficiency of burning inferior coal；ΔqiFor spray water flux changing value, including superheater at different levels and reheater spray water flux, unit
For t/h；xiFactor of influence for spray water flux to coal consumption；ΔζiIt is main big including three for the changing value of every subsidiary engine station service power consumption rate
The power consumption of blower fan and coal pulverizer, %；ζ0For unit benchmark station service power consumption rate, %.
5. the computational methods of coal-burning power plant limit as claimed in claim 1 coal unit price difference, it is characterised in that when unit is actual
When load is close to rated load, x takes 1；When unit actual load and larger rated load deviation, determined according to result of the test
The correction factor, and the calculation formula of marginal coal unit price difference is modified.
6. the computational methods of coal-burning power plant limit as claimed in claim 1 coal unit price difference, it is characterised in that described Δ as
Compared to the increased desulphurization cost of conventional coal is used after being deteriorated for ature of coal, refer to that sulfur content in coal amount increase causes unit to remove two
The increase of the investment operation expense of sulfur oxide, wherein, the sulphur content in coal is approximately considered the dioxy being completely converted into flue gas
Change sulphur.
7. the computational methods of coal-burning power plant limit as claimed in claim 6 coal unit price difference, it is characterised in that work as sulfur content in coal
When measuring constant, Δ asFor 0.
8. the computational methods of coal-burning power plant limit as claimed in claim 1 coal unit price difference, it is characterised in that desulphurization system is
During the desulfurization by lime gypsum method system of routine, the increased computational methods following formula institute of desulphurization cost caused by ature of coal sulphur content increase
Show：
<mrow>
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</msub>
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<mi>&Delta;a</mi>
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</mrow>
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<mo>,</mo>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>&Delta;a</mi>
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<mi>c</mi>
</mrow>
</msub>
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</mrow>
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In formula, the Δ as,caoWithThe incrementss of lime stone and water respectively needed for desulfurization slurry raw material, Δ as,cFor
The increase of catalyst cost, the Δ as,PDesulphurization system power consumption increase caused by being deteriorated for ature of coal.
9. coal-burning power plant limit as claimed in claim 1 coal unit price difference computational methods, it is characterised in that desulphurization system into
This value added Δ asBy following formula approximate estimation, Δ as=y Δs S, the y are the desulphurization cost factor, and unit is member/(t*1% sulfur-bearings
Amount)；Δ S be sulfur content in coal amount changing value, unit %.
10. the computational methods of coal-burning power plant limit as claimed in claim 1 coal unit price difference, it is characterised in that denitrating system
Cost value added Δ anFor after coal varitation compared to using the increased denitration cost of conventional coal, it is contemplated that coal varitation is to original
The nitrogen oxide emission influence of flue gas is relatively small, takes Δ anEqual to 0.
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| CN115034082B (en) * | 2022-06-29 | 2024-03-05 | 西安热工研究院有限公司 | Oxidation fan electricity consumption correction calculation method in station service electricity consumption calculation of thermal power generating unit |
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| CN110070387A (en) * | 2019-03-19 | 2019-07-30 | 武汉华中思能科技有限公司 | A kind of electric power frequency modulation price quoting method and system based on marginal cost |
| CN111720178A (en) * | 2020-06-11 | 2020-09-29 | 浙江浙能技术研究院有限公司 | Cold end optimization statistical analysis method for coal-fired generator set based on correlation between power supply coal consumption and investment yield |
| CN113378405A (en) * | 2021-06-29 | 2021-09-10 | 国能南京电力试验研究有限公司 | Economizer outlet NOXConcentration economic value determination method |
| CN113378405B (en) * | 2021-06-29 | 2024-01-16 | 国能南京电力试验研究有限公司 | Outlet NO of coal economizer X Concentration economic value determining method |
| CN115034082B (en) * | 2022-06-29 | 2024-03-05 | 西安热工研究院有限公司 | Oxidation fan electricity consumption correction calculation method in station service electricity consumption calculation of thermal power generating unit |
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