CN107316104A - The coal mixing combustion forecast system of assessment system after a kind of band - Google Patents

The coal mixing combustion forecast system of assessment system after a kind of band Download PDF

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CN107316104A
CN107316104A CN201710425337.0A CN201710425337A CN107316104A CN 107316104 A CN107316104 A CN 107316104A CN 201710425337 A CN201710425337 A CN 201710425337A CN 107316104 A CN107316104 A CN 107316104A
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蒙毅
李仁义
赵越
姚伟
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Xian Xire Boiler Environmental Protection Engineering Co Ltd
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Abstract

The invention discloses a kind of coal mixing combustion forecast system of assessment system after band, when power plant carries out many coal coal mixing combustions, the burning scheme of mixing of crew qiting Coal rank and mixed-fuel burning proportion is made and judged in advance using the design parameter of the system combination power plant, architectural feature, fuel characteristic data, examination can be reduced to burn experiment, evade environmental protection and security risk, and lift the economy of unit operation.Predict coal mixing combustion whether the scheme of suggestion assesses the checking program after being carried out again to it by actually mixing the service data of burning feasible afterwards.The system can provide science for the mixed coal combustion of research object power plant, simple and effective decision-making technic is supported, theoretical and application foundation has been established for development coal mixing combustion technology.

Description

The coal mixing combustion forecast system of assessment system after a kind of band
Technical field：
The present invention relates to one kind, the invention belongs to thermal power generating technology field, and in particular to assessment system matches somebody with somebody after a kind of band Coal mixes burning forecast system.
Background technology：
The adaptability of coal characteristic and boiler controller system, economical operation safe and environment-friendly to boiler controller system is most important.It is coal-fired Power plant to design coal, check coal and using or mix burning and may use or mix the coal of burning it is necessary to have comprehensive Understanding, grasp their grinding, catch fire, burn, slagging, contamination, environmental protection characteristic, just can ensure that the peace of whole thermal power plant operation Complete and economy.Now, increasing thermal power plant can not obtain enough design coals, can only be mixed many coals Burning is mixed in conjunction.In the epoch surfed the Net at a competitive price in power plant, how to select coal source and provide reliably to use or mix burning scheme and technological guidance, Performance driving economy and security are improved, cost of electricity-generating is reduced, uses one of the problem of more economical fuel is owner's overriding concern. Body series predict many coal coal blendings and mix burning effect, provide unit operation according to the applicability of coal property and boiler plant Safe and environment-friendly, economic optimum coal mixture scheme mixes burning scheme, instructs thermal power plant to carry out the coal management of science and mix burning decision-making, ensures Unit safety, efficient, clean operation, and based on " power plant's SIS systems " real-time data base and fuel whole process management system, Using data mining technology, coal mixing combustion case real-time tracking is evaluated, coal mixing combustion effect assessment and fuel cost is established Analysis and optimization model, constructs coal mixing combustion experience storehouse, realizes and mixes the real-time assessment for burning effect and mix the benign of burning process Closed loop management.
The content of the invention：
It is an object of the invention to provide a kind of coal mixing combustion forecast system of assessment system after band.
To achieve the above object, present invention employs following technical scheme：
The coal mixing combustion forecast system of assessment system after a kind of band, including coal mixing combustion module and rear assessment system module； Wherein, coal mixing combustion module is used to formulate coal mixing combustion scheme, and rear assessment system module is used to verify coal mixing combustion prediction module The correctness of conclusion.
Further improve of the invention is that coal mixing combustion prediction module includes
Coal-fired ature of coal is calculated evaluates submodule with coal, non-for the calculating of mixed coal ature of coal parameter linear model, ature of coal parameter Linear model is calculated and coal is evaluated；
Coal-fired spontaneous combustion predicts submodule with mobility, evaluates what submodule was obtained with coal for being calculated according to coal-fired ature of coal Ature of coal parameter, which is calculated, obtains mixed coal ignition quality, coal-fired mobility prediction；
Pulverized coal preparation system runnability predicts submodule, evaluates what submodule was obtained with coal for being calculated according to coal-fired ature of coal Ature of coal parameter calculates and obtains Mill output, coal dust explosion characteristic, coal pulverizer abrasive article life-span；
Burning, slagging trend prediction submodule, are obtained for being calculated according to coal-fired ature of coal with coal evaluation submodule in stove Ature of coal parameter calculate obtain boiler minimum steady combustion load, uncompleted burned carbon heat loss, burner hearth/screen area slagging trend prediction；
Submodule is predicted in pollutant emission, and the ature of coal ginseng that submodule is obtained is evaluated with coal for being calculated according to coal-fired ature of coal Number calculating obtains NOXDischarge capacity, SO2Discharge capacity, dust discharge amount prediction；
Boiler major pant item adaptive forecasting submodule, is obtained for being calculated according to coal-fired ature of coal with coal evaluation submodule Ature of coal parameter calculate obtain pressure fan, primary air fan, deashing device, residue extraction mechanism adaptive forecasting；
Power plant's performance driving economy prediction submodule, the coal that submodule is obtained is evaluated for being calculated according to coal-fired ature of coal with coal Matter parameter, which is calculated, obtains intrinsic economy, performance driving economy prediction.
Further improve of the invention is that coal-fired ature of coal is calculated to be evaluated in submodule with coal, using GB/T7562-98 Standard, is evaluated coal, and ature of coal parameter linear model is as follows during coal-fired ature of coal is calculated：
(1) weighted average linear relationship
X=(rAXA+rBXB+rCXC)/(rA+rB+rC) (1)
In formula, X, linear ature of coal parameter；R is mixed coal ratio；
(2) ash content weighted average linear relationship
X=(rAAar,AXA+rBAar,BXB+rCAar,CXC)/(rAAar,A+rBAar,B+rCAar,C) (2)
In formula, Aar is As-received ash content；
Ature of coal parameter non-linear model is as follows：
(1) burning performance parameter nonlinear model
Y=A0+A1 × X1+A2 × X2+ ...+A9 × X9 (3)
It is above-mentioned each influence factor or its group that wherein Y, which represents Ignition Temperature for Blended Coal IT, burn-off rate Bp and slagging index Sc, Xi, Close, Ai is coefficient, each combustibility index and its influence factor are listed in table 1, and regression coefficient is fitted by experiment, and draws each burning Blended Coal Combustion performance evaluation after index, is carried out according to GB/T7562-98 standards；
The recurrence factor of the Blended Coal Combustion index of table 1
Coefficient A A0 A1 A2 A3 A4 A5 A6 A7 A8 A9
Factor Xi C Vdaf Qnet,ar Aar Mt Ratio1 Vdaf/Aar Vdaf/Mt Qnet,ar/Aar Qnet,ar/Mt
Note 1：Ratio, which refers to, to be mixed in burning coal with respect to the coal ratio preferably burnt；
(2) other ature of coal parameter non-linear models
Maximum coal ash ratio resistance R=(10.23+0.0491 × Al2O3-0.0342×Cfh)10 (4)
In formula, Al2O3For mixed coal ash component；CfhFor unburned combustible in fly ash, %；
The mixed coal ature of coal output table of table 2 and ature of coal collect with coal characteristic index calculating method
The present invention, which is further improved, to be,
Mixed coal blast, ignition quality are calculated as follows：
In formula, KdThe index of expolsibility of-coal dust；VdThe drying base volatile matter of-coal, Vd=Vdaf × (100-Mt)/(100- Aar-Mt), %；VVol, queThe lower limit of flammable volatile matter needed for burning, % when-consideration ash and coke；
Vvol=(1260/Qvol)×100 (7)
Qvol=(QNet, v, daf-78.50×4.1816×FCdaf)/Vdaf (8)
FCdaf=1-Vdaf (9)
In formula, Vvol- do not consider ash and during coke flammable volatile matter needed for burning lower limit, %；QvolThe heat of-volatile matter Value, kJ/kg；QNet, v, dafThe dry ash free basis low heat valve of-coal, kJ/kg；FCdafThe dry ash free basis fixed carbon of-coal contains Amount；VdafThe dry ash free basis volatile matter content of-coal；
The index of expolsibility K of experiment coal dust is calculated using above-mentioned formuladValue is bigger, and explosion tendency is more serious, and criterion is as follows：
The index of expolsibility of the coal dust of table 3 and the relation of raw coal spontaneous combustion characteristic
The index of expolsibility of coal dust The explosivity of coal dust The spontaneous combustion tendency of raw coal Raw coal pilling up time
Kd<1.0 It is low It is low Do not limit
1.0<Kd<3.0 In It is medium Do not limit
Kd≥3.0 Easily Easily In 1 month
Coal-fired mobility prediction：
Mf=100 × (Mt-Mad)/(100-Mad), % (10)
MfIt is to the discrimination standard of raw coal mobility：
Mf≤ 8.0% defeated coal is normal
8%<Mf≤ 12.0% is likely to occur run coal bin coal breakage blockage
Mf＞ 12.0% is difficult to safe operation
Mill output is calculated
Flour mill is exerted oneself=Max (BM, BM,d) (11)
(1) B that exerts oneself is groundMCalculate
The modified computing formulae that medium-speed pulverizer grinding is exerted oneself is as follows：
BM=BMO×fH×fR×fM×fA×fg×fe (12)
In formula, BMO- coal pulverizer is exerted oneself substantially, fH、fR、fm、fa、fg、fe- it is respectively grindability, fineness of pulverized coal, raw coal Moisture content, original coal ash part, raw coal size and part of milling are exerted oneself when wearing up to the middle and later periods reduces the correction factor to pulverizer capacity；
(2) drying capacity of pulverizer BM,dCalculate：
The drying capacity of pulverizer of table 5 is calculated
The coal pulverizer abrasive article life-span calculates：
Coal pulverizer abrasive article life-span=137.34 × Ke4–2257×Ke3+13812×Ke2- 38751 × Ke+48703 is small When；
Boiler minimum steady fires carry calculation：
(1) pre- blending is burnt
In formula, IT-breeze airflow ignition temperature, DEG C；Qnet,adThe empty butt low heat valve of-coal sample, MJ/kg；qF= qF is designed- boiler at full capacity under design furnace cross, kW/m2；
Qnet,ad={ (Qnet,ar×1000+25Mt)×(100-Mad)/(100-Mt)-25×Mad/4.1816}/1000 (14)
(2) mill is divided to mix burning
The Dmin of each single fire raw coal is calculated, the index of stability Dminh of mixed coal is calculated when carrying out the mill operation of n platforms as the following formula：
Dminh=(Dmin1×Q1+Dmin2×Q2+......+DminN × Qn)/(Q1+Q2+.....+Qn), %
In formula, Dmin1~DminN-First is milled to n-th coal-fired index of stability that catches fire of mill, is calculated by formula (13)；Q1 ~Qn-First is milled to the coefficient of n-th coal-fired index of stability that catches fire of mill；
Uncompleted burned carbon heat loss is calculated：
(1) pre- blending is burnt
In formula, qV- boiler actual heating load parameter, qV=actual load/BMCR operating modes thermic load × qV,BMCR；qF- pot Stove actual heating load parameter, qF=actual load/BMCR operating modes thermic load × qF,BMCR, B2 is the burn-off rate of operating mode two；
(2) mill is divided to mix burning
Distance of each mill burner away from screen bottom determines the after-flame degree of the coal-grinding coal, mixed coal when calculating the mill operation of n platforms q4h：
Q4h=(q41/L1+q42/L2+ ...+q4n/Ln)/(1/L1+1/L2+ ...+1/Ln), % (16)
In formula, q41~~q4n-First is milled to n-th coal-fired q4 value of mill；L1~Ln-it is respectively first layer and the N-layer burner is milled to the distance at screen bottom；
The slagging trend prediction in burner hearth/screen area：
(1) pre- blending is burnt
Premix mode lower hearth has identical slagging trend with screen area, and Boiler Furnace slagging characteristic is differentiated with slagging index Su, Calculation formula is as follows：
In formula, SU coals- be coal sample slagging index；
qF- negative the kW/m of section of burner hearth heat under the corresponding load of boiler2, qF=actual load/BMCR operating modes thermic load × qF,BMCR；
The ash erosion index and slag formation at platen zone index calculated is by following grade discrimination：
Su More than 5 5-4 4-3 3-2 Less than 2
Differentiate grade Seriously It is high Middle height In It is low
(2) mill is divided to mix burning
Mill is divided to mix under burning mode, the Su that Boiler Furnace slagging index is directly calculated with mixed coal data；And screen during the mill operation of n platforms Area slagging index Suh is calculated as follows：
Suh=(Su1 × Q1+Su2 × Q2+ ...+Sun × Qn)/(Q1+Q2+ ...+Qn) (18)
In formula, Su1~Sun-be milled to n-th coal-fired slagging index value of mill for First；
Q1~Qn-coal-fired influence the coefficient to slag formation at platen zone of difference mill；
NOXDischarge capacity, SO2Discharge capacity, dust discharge amount prediction are calculated；
(1) NOx emission predictive
NOx=(1182.978 × Nar- 0.9338934 × Vdaf×Qnet,ar+0.0063/Vdaf- 17.021/Vdaf/Nar+ 491.9144)×FH×FO2×K,mg/m3 (19)
In formula, FH- it is load correction value；
FO2- it is operation oxygen amount correction value；
K-and it is unit correction value, it is modified by calculated value with actual value gap；
By actual NOx generation amount, predict whether the disposal ability of denitrating system is up to standard, no denitrating system then judges Whether NOx discharge is exceeded；
(2)SO2Forecasting of discharged quantity
From desulfurization degree ηSCalculation formula it is as follows：
ηS=33.31-0.925 × Qnet, ar)+7.62 × Ks,self, % (20)
In formula, Ks,self, the calcium to sulphur mole ratio of coal itself, Ks,self=0.00571 × 0.90 × Aar×CaO/St,ar；
Theoretical SO2Discharge capacity SO2' calculated as the following formula：
SO2'=20000 × St,ar/Vgy,mg/m3 (21)
In formula, Vgy- theory dry flue gas amount, m3/ kg, Vgy=1.866 × (Car+0.375×St,ar)/100+0.79×Vgk +0.4×Vgk；
Vgk- theory dry air amount, m3/ kg, Vgk=0.089 × (Car+0.375 × St,ar)+0.265×Har-0.0333 ×Oar；
Then actual SO2Discharge capacity is：
SO2=(100- ηS)/100×SO2', mg/m3 (22)
Pass through actual SO2Growing amount, predicts whether the disposal ability of desulphurization system is up to standard；
(3) dust discharge amount is predicted
Actual ash quantity A=Aar × 0.90 × Coal-fired capacity (23)
In formula, the percentage of Aar-mixed coal ash quantity；
Dust collection efficiency：η c=[1-exp (- A × K1×K2×K3)]×(KY×Kt)×100 (24)
In formula, η c are the efficiency of dust collection after correction；
A designs numerical constant for deduster；
K1, K2, K3 are respectively sulphur content, ash content, the correction coefficient of ratio resistance；
Dust emission concentration=0.9 × ash content Aar/100 × 106× (100- dust collection efficiencies)/100/ exhaust gas volumn, mg/m3 (25)
Pressure fan adaptive computation：
VPF=primary air ratio × Vk (26)
V in formulaPFFor air quantity, VkTo give amount of actual air for combustion；
The primary air flow that calculating is obtained is compared with primary air fan design load, judges the adaptability of blower fan；
Pressure fan adaptive computation：
VPF=(1- primary air ratios) × Vk × enters stove fuel quantity (27)
The air output that calculating is obtained is compared with pressure fan design load, judges the adaptability of blower fan；
Ash discharge residue extraction mechanism adaptive computation：
Slag amount=total lime-ash amount × (100- μ)/100 (28)
Table slag amount ratio μ and the relation of actual slagging in stove
Sequence number Calculation formula Adapt to interval
1 μ=10% Actual slagging index Su in stove:<3.0
2 μ=(5 × Su-5) % Actual slagging index Su in stove:≥3.0
The slag amount that calculating is obtained is compared with design load, judges the adaptability of ash discharge residue extraction mechanism adaptability；
Intrinsic its economic prediction：
Intrinsic economy is tried to achieve by the weighted average of each single coal coal price in proportion：
Mh=X1/100·M1+X2/100·M2+…… (29)
MhThe actual coal price of-mixed coal, yuan/ton；
M1、M2...-feed coal 1,2 ... actual coal price, yuan/ton；
X1、X2...-feed coal 1,2 ... ratio, %；
The standard coal price for mixing burning coal and mixed coal is then tried to achieve as follows：
M1b=M1·29.27/(Qnet,ar)1(29)
M2b=M2·29.27/(Qnet,ar)2(29)
......
Mhb=Mh·29.27/(Qnet,ar)h(29)
In formula, M1b、M2b、MhbThe standard coal price of-feed coal 1,2 and mixed coal, yuan/ton；
(Qnet,ar)1、(Qnet,ar)2、(Qnet,ar)hThe low heat valve of-feed coal 1,2 and mixed coal, MJ/kg；
Performance driving economy is predicted；
Only in boiler accommodation, the change of ature of coal parameter is to the maximum boiler efficiency of economic influence and main auxiliary Electromechanics consumption change carries out coal consumption variation prediction；
Δ MH=Δs MHglxl+ΔMHfjdh (30)
Wherein, Δ MHglxlInfluence of the boiler efficiency to coal consumption：
In formula, MHGross coal consumption rateFor design gross coal consumption rate, Δ MHfjdhInfluence of the subsidiary engine power consumption to coal consumption；
Considering the power consumption change of boiler major pant item includes：Coal pulverizer, pressure fan, air-introduced machine, primary air fan and desulfurization The change of system boost blower fan power consumption；
Cost of electricity-generating refers to the cost that electricity is often spent in output, specific as follows：
Cost of electricity-generating=mixed coal coal price × 10-6× coal consumption/100, kw h/ members (32)
Further improve of the invention is that rear assessment system module includes,
Security evaluation submodule, is assessed for metal pipe-wall temperature, ash erosion and fouling characteristics；
Submodule is assessed in environmental protection, for the assessment of the NOx feature of environmental protection, SO2The feature of environmental protection is assessed and the flue dust feature of environmental protection is assessed；
Economic evaluation submodule, for boiler efficiency, coal consumption assessment, main boiler accessory machinery power consumption, desulfurization and denitrating system Operating cost is assessed.
Further improve of the invention is, with the system in rear assessment system collection SIS in Thermal Power PlantQ Whether corresponding real time data evaluation scheme is feasible, firstly evaluates the safety and the feature of environmental protection of the program, if not meeting power plant's mark Accurate situation is determined as infeasible scheme, and burning experience storehouse failure case is mixed in typing；Scheme foundation to meeting safety and the feature of environmental protection Power plant's standard continues to judge its economy, and the scheme poor to economy is determined as basic feasible solution scheme, outstanding to economy Scheme is determined as proposed projects, and burning experience storehouse successful case is mixed in the equal typing of both the above scheme.
The present invention has following beneficial effect：
The 1st, coal mixing combustion safe operation suggestion can be provided for unit, and assess unit safety operation level in real time, it is ensured that The operation of unit long-term safety；
2nd, coal source channel is widened, coal market is adapted to for greater flexibility, the utilization rate of economic coal is effectively improved, fuel is reduced Cost；
3rd, Power Plant Fuel managerial skills are improved, Optimized Coal Blending mixes the burning method of operation, is that unit improves economic operation level, carries For effective technological guidance；
4th, by Rational mixed coal, can effectively it reduce and management and control atmosphere pollution SO2、NOxAnd the discharge of dust, it is ensured that machine Group environmental protection operation.
Brief description of the drawings：
Fig. 1 coal mixing combustion forecasting system flow charts；
Fig. 2 mixes burning scheme evaluation flow chart online.
Embodiment：
The present invention is described in detail with reference to the accompanying drawings and examples.
As shown in figure 1, the pre- flow gauge of coal mixing combustion：
1. start coal mixing combustion prediction, first from Chinese steam coal database selection 1-3 kind lists coal input coal data.
2. selection mix the boiler plant information of burning, and inputs service condition.
3. selection mixes burning mode to premix or divide a mill to mix burning.
4. automatic assignment is carried out to chlorine adding ratio using the method for exhaustion.
5. call coal-fired ature of coal to calculate mixed coal ature of coal is calculated and made an appraisal with coal evaluation submodule.
6. calculating the 2-8 modules of coal mixing combustion prediction respectively under the conditions of the chlorine adding ratio, and result of calculation is recorded with commenting Valency conclusion.
7. circulation is calculated until the calculating of all chlorine adding ratios is finished.
8. pair all chlorine adding ratio schemes judge, it is every do not meet that safety should be determined as with the scheme of the feature of environmental protection can not Row scheme.To existing compared with minor issue, such as combustion stability is general, unit on-load ability is poor, mixed coal abrasiveness height Scheme is determined as basic feasible solution scheme.Proposed projects is determined as to the scheme without any problem.Afterwards in proposed projects The minimum scheme of selection cost of electricity-generating is defined as preferred plan.
As shown in Fig. 2 after line mixes burning scheme estimation flow：
1. it is selected it is predicted that preferred plan or basic feasible solution scheme it is commented according to power plant's SIS system operation datas Estimate.
2. the historical period of selection scheme operation and the operational factor for gathering the period.
3. assessment system submodule 1-2 assesses the safety and the feature of environmental protection of the program after investigation, if there is non-compliant feelings Condition is determined as infeasible scheme, and burning experience storehouse failure case is mixed in typing.
4. the scheme of pair safety and the feature of environmental protection continues to judge its economy, the scheme poor to economy is judged to substantially may be used Row scheme, the scheme outstanding to economy is determined as proposed projects, and burning experience storehouse successful case is mixed in the equal typing of both the above scheme.
Specifically, after a kind of band of the invention assessment system coal mixing combustion forecast system, including coal mixing combustion module with Assessment system module afterwards；Wherein, coal mixing combustion module is used to formulate coal mixing combustion scheme, and rear assessment system module is matched somebody with somebody for checking Coal mixes the correctness for burning prediction module conclusion.
Further, coal mixing combustion prediction module includes coal-fired ature of coal calculating and coal evaluation submodule, for mixed coal ature of coal Parameter linear model is calculated, ature of coal parameter non-linear model is calculated and coal is evaluated；
Coal-fired spontaneous combustion predicts submodule with mobility, evaluates what submodule was obtained with coal for being calculated according to coal-fired ature of coal Ature of coal parameter, which is calculated, obtains mixed coal ignition quality, coal-fired mobility prediction；
Pulverized coal preparation system runnability predicts submodule, evaluates what submodule was obtained with coal for being calculated according to coal-fired ature of coal Ature of coal parameter calculates and obtains Mill output, coal dust explosion characteristic, coal pulverizer abrasive article life-span；
Burning, slagging trend prediction submodule, are obtained for being calculated according to coal-fired ature of coal with coal evaluation submodule in stove Ature of coal parameter calculate obtain boiler minimum steady combustion load, uncompleted burned carbon heat loss, burner hearth/screen area slagging trend prediction；
Submodule is predicted in pollutant emission, and the ature of coal ginseng that submodule is obtained is evaluated with coal for being calculated according to coal-fired ature of coal Number calculating obtains NOXDischarge capacity, SO2Discharge capacity, dust discharge amount prediction；
Boiler major pant item adaptive forecasting submodule, is obtained for being calculated according to coal-fired ature of coal with coal evaluation submodule Ature of coal parameter calculate obtain pressure fan, primary air fan, deashing device, residue extraction mechanism adaptive forecasting；
Power plant's performance driving economy prediction submodule, the coal that submodule is obtained is evaluated for being calculated according to coal-fired ature of coal with coal Matter parameter, which is calculated, obtains intrinsic economy, performance driving economy prediction.
Coal-fired ature of coal is calculated to be evaluated in submodule with coal, and using GB/T7562-98 standards, coal is evaluated, fired Ature of coal parameter linear model is as follows during coal ature of coal is calculated：
(1) weighted average linear relationship
X=(rAXA+rBXB+rCXC)/(rA+rB+rC) (1)
In formula, X, linear ature of coal parameter；R is mixed coal ratio；
(2) ash content weighted average linear relationship
X=(rAAar,AXA+rBAar,BXB+rCAar,CXC)/(rAAar,A+rBAar,B+rCAar,C) (2)
In formula, Aar is As-received ash content；
Ature of coal parameter non-linear model is as follows：
(1) burning performance parameter nonlinear model
Y=A0+A1 × X1+A2 × X2+ ...+A9 × X9 (3)
It is above-mentioned each influence factor or its group that wherein Y, which represents Ignition Temperature for Blended Coal IT, burn-off rate Bp and slagging index Sc, Xi, Close, Ai is coefficient, each combustibility index and its influence factor are listed in table 1, and regression coefficient is fitted by experiment, and draws each burning Blended Coal Combustion performance evaluation after index, is carried out according to GB/T7562-98 standards；
The recurrence factor of the Blended Coal Combustion index of table 1
Coefficient A A0 A1 A2 A3 A4 A5 A6 A7 A8 A9
Factor Xi C Vdaf Qnet,ar Aar Mt Ratio1 Vdaf/Aar Vdaf/Mt Qnet,ar/Aar Qnet,ar/Mt
Note 1：Ratio, which refers to, to be mixed in burning coal with respect to the coal ratio preferably burnt；
(2) other ature of coal parameter non-linear models
Maximum coal ash ratio resistance R=(10.23+0.0491 × Al2O3-0.0342×Cfh)10 (4)
In formula, Al2O3For mixed coal ash component；CfhFor unburned combustible in fly ash, %；
The mixed coal ature of coal output table of table 2 and ature of coal collect with coal characteristic index calculating method
Mixed coal blast, ignition quality are calculated as follows：
In formula, KdThe index of expolsibility of-coal dust；VdThe drying base volatile matter of-coal, Vd=Vdaf × (100-Mt)/(100- Aar-Mt), %；VVol, queThe lower limit of flammable volatile matter needed for burning, % when-consideration ash and coke；
Vvol=(1260/Qvol)×100 (7)
Qvol=(QNet, v, daf-78.50×4.1816×FCdaf)/Vdaf (8)
FCdaf=1-Vdaf (9)
In formula, Vvol- do not consider ash and during coke flammable volatile matter needed for burning lower limit, %；QvolThe heat of-volatile matter Value, kJ/kg；QNet, v, dafThe dry ash free basis low heat valve of-coal, kJ/kg；FCdafThe dry ash free basis fixed carbon of-coal contains Amount；VdafThe dry ash free basis volatile matter content of-coal；
The index of expolsibility K of experiment coal dust is calculated using above-mentioned formuladValue is bigger, and explosion tendency is more serious, and criterion is as follows：
The index of expolsibility of the coal dust of table 3 and the relation of raw coal spontaneous combustion characteristic
The index of expolsibility of coal dust The explosivity of coal dust The spontaneous combustion tendency of raw coal Raw coal pilling up time
Kd<1.0 It is low It is low Do not limit
1.0<Kd<3.0 In It is medium Do not limit
Kd≥3.0 Easily Easily In 1 month
Coal-fired mobility prediction：
Mf=100 × (Mt-Mad)/(100-Mad), % (10)
MfIt is to the discrimination standard of raw coal mobility：
Mf≤ 8.0% defeated coal is normal
8%<Mf≤ 12.0% is likely to occur run coal bin coal breakage blockage
Mf＞ 12.0% is difficult to safe operation
Mill output is calculated
Flour mill is exerted oneself=Max (BM, BM,d) (11)
(1) B that exerts oneself is groundMCalculate
The modified computing formulae that medium-speed pulverizer grinding is exerted oneself is as follows：
BM=BMO×fH×fR×fM×fA×fg×fe (12)
In formula, BMO- coal pulverizer is exerted oneself substantially, fH、fR、fm、fa、fg、fe- it is respectively grindability, fineness of pulverized coal, raw coal Moisture content, original coal ash part, raw coal size and part of milling are exerted oneself when wearing up to the middle and later periods reduces the correction factor to pulverizer capacity；
(2) drying capacity of pulverizer BM,dCalculate：
The drying capacity of pulverizer of table 5 is calculated
The coal pulverizer abrasive article life-span calculates：
Coal pulverizer abrasive article life-span=137.34 × Ke4–2257×Ke3+13812×Ke2- 38751 × Ke+48703 is small When；
Boiler minimum steady fires carry calculation：
(1) pre- blending is burnt
In formula, IT-breeze airflow ignition temperature, DEG C；Qnet,adThe empty butt low heat valve of-coal sample, MJ/kg；qF= qF is designed- boiler at full capacity under design furnace cross, kW/m2；
Qnet,ad={ (Qnet,ar×1000+25Mt)×(100-Mad)/(100-Mt)-25×Mad/4.1816}/1000 (14)
(2) mill is divided to mix burning
The Dmin of each single fire raw coal is calculated, the index of stability Dminh of mixed coal is calculated when carrying out the mill operation of n platforms as the following formula：
Dminh=(Dmin1×Q1+Dmin2×Q2+......+DminN × Qn)/(Q1+Q2+.....+Qn), %
In formula, Dmin1~DminN-First is milled to n-th coal-fired index of stability that catches fire of mill, is calculated by formula (13)；Q1 ~Qn-First is milled to the coefficient of n-th coal-fired index of stability that catches fire of mill；
Uncompleted burned carbon heat loss is calculated：
(1) pre- blending is burnt
In formula, qV- boiler actual heating load parameter, qV=actual load/BMCR operating modes thermic load × qV,BMCR；qF- pot Stove actual heating load parameter, qF=actual load/BMCR operating modes thermic load × qF,BMCR, B2 is the burn-off rate of operating mode two；
(2) mill is divided to mix burning
Distance of each mill burner away from screen bottom determines the after-flame degree of the coal-grinding coal, mixed coal when calculating the mill operation of n platforms q4h：
Q4h=(q41/L1+q42/L2+ ...+q4n/Ln)/(1/L1+1/L2+ ...+1/Ln), % (16)
In formula, q41~~q4n-First is milled to n-th coal-fired q4 value of mill；L1~Ln-it is respectively first layer and the N-layer burner is milled to the distance at screen bottom；
The slagging trend prediction in burner hearth/screen area：
(1) pre- blending is burnt
Premix mode lower hearth has identical slagging trend with screen area, and Boiler Furnace slagging characteristic is differentiated with slagging index Su, Calculation formula is as follows：
In formula, SU coals- be coal sample slagging index；
qF- negative the kW/m of section of burner hearth heat under the corresponding load of boiler2, qF=actual load/BMCR operating modes thermic load × qF,BMCR；
The ash erosion index and slag formation at platen zone index calculated is by following grade discrimination：
Su More than 5 5-4 4-3 3-2 Less than 2
Differentiate grade Seriously It is high Middle height In It is low
(2) mill is divided to mix burning
Mill is divided to mix under burning mode, the Su that Boiler Furnace slagging index is directly calculated with mixed coal data；And screen during the mill operation of n platforms Area slagging index Suh is calculated as follows：
Suh=(Su1 × Q1+Su2 × Q2+ ...+Sun × Qn)/(Q1+Q2+ ...+Qn) (18)
In formula, Su1~Sun-be milled to n-th coal-fired slagging index value of mill for First；
Q1~Qn-coal-fired influence the coefficient to slag formation at platen zone of difference mill；
NOXDischarge capacity, SO2Discharge capacity, dust discharge amount prediction are calculated；
(1) NOx emission predictive
NOx=(1182.978 × Nar- 0.9338934 × Vdaf×Qnet,ar+0.0063/Vdaf- 17.021/Vdaf/Nar+ 491.9144)×FH×FO2×K,mg/m3 (19)
In formula, FH- it is load correction value；
FO2- it is operation oxygen amount correction value；
K-and it is unit correction value, it is modified by calculated value with actual value gap；
By actual NOx generation amount, predict whether the disposal ability of denitrating system is up to standard, no denitrating system then judges Whether NOx discharge is exceeded；
(2)SO2Forecasting of discharged quantity
From desulfurization degree ηSCalculation formula it is as follows：
ηS=33.31-0.925 × Qnet, ar)+7.62 × Ks,self, % (20)
In formula, Ks,self, the calcium to sulphur mole ratio of coal itself, Ks,self=0.00571 × 0.90 × Aar×CaO/St,ar；
Theoretical SO2Discharge capacity SO2' calculated as the following formula：
SO2'=20000 × St,ar/Vgy,mg/m3 (21)
In formula, Vgy- theory dry flue gas amount, m3/ kg, Vgy=1.866 × (Car+0.375×St,ar)/100+0.79×Vgk +0.4×Vgk；
Vgk- theory dry air amount, m3/ kg, Vgk=0.089 × (Car+0.375 × St,ar)+0.265×Har-0.0333 ×Oar；
Then actual SO2Discharge capacity is：
SO2=(100- ηS)/100×SO2', mg/m3 (22)
Pass through actual SO2Growing amount, predicts whether the disposal ability of desulphurization system is up to standard；
(3) dust discharge amount is predicted
Actual ash quantity A=Aar × 0.90 × Coal-fired capacity (23)
In formula, the percentage of Aar-mixed coal ash quantity；
Dust collection efficiency：η c=[1-exp (- A × K1×K2×K3)]×(KY×Kt)×100 (24)
In formula, η c are the efficiency of dust collection after correction；
A designs numerical constant for deduster；
K1, K2, K3 are respectively sulphur content, ash content, the correction coefficient of ratio resistance；
Dust emission concentration=0.9 × ash content Aar/100 × 106× (100- dust collection efficiencies)/100/ exhaust gas volumn, mg/m3 (25)
Pressure fan adaptive computation：
VPF=primary air ratio × Vk (26)
V in formulaPFFor air quantity, VkTo give amount of actual air for combustion；
The primary air flow that calculating is obtained is compared with primary air fan design load, judges the adaptability of blower fan；
Pressure fan adaptive computation：
VPF=(1- primary air ratios) × Vk × enters stove fuel quantity (27)
The air output that calculating is obtained is compared with pressure fan design load, judges the adaptability of blower fan；
Ash discharge residue extraction mechanism adaptive computation：
Slag amount=total lime-ash amount × (100- μ)/100 (28)
Table slag amount ratio μ and the relation of actual slagging in stove
Sequence number Calculation formula Adapt to interval
1 μ=10% Actual slagging index Su in stove:<3.0
2 μ=(5 × Su-5) % Actual slagging index Su in stove:≥3.0
The slag amount that calculating is obtained is compared with design load, judges the adaptability of ash discharge residue extraction mechanism adaptability；
Intrinsic its economic prediction：
Intrinsic economy is tried to achieve by the weighted average of each single coal coal price in proportion：
Mh=X1/100·M1+X2/100·M2+…… (29)
MhThe actual coal price of-mixed coal, yuan/ton；
M1、M2...-feed coal 1,2 ... actual coal price, yuan/ton；
X1、X2...-feed coal 1,2 ... ratio, %；
The standard coal price for mixing burning coal and mixed coal is then tried to achieve as follows：
M1b=M1·29.27/(Qnet,ar)1(29)
M2b=M2·29.27/(Qnet,ar)2(29)
......
Mhb=Mh·29.27/(Qnet,ar)h(29)
In formula, M1b、M2b、MhbThe standard coal price of-feed coal 1,2 and mixed coal, yuan/ton；
(Qnet,ar)1、(Qnet,ar)2、(Qnet,ar)hThe low heat valve of-feed coal 1,2 and mixed coal, MJ/kg；
Performance driving economy is predicted；
Only in boiler accommodation, the change of ature of coal parameter is to the maximum boiler efficiency of economic influence and main auxiliary Electromechanics consumption change carries out coal consumption variation prediction；
Δ MH=Δs MHglxl+ΔMHfjdh (30)
Wherein, Δ MHglxlInfluence of the boiler efficiency to coal consumption：
In formula, MHGross coal consumption rateFor design gross coal consumption rate, Δ MHfjdhInfluence of the subsidiary engine power consumption to coal consumption；
Considering the power consumption change of boiler major pant item includes：Coal pulverizer, pressure fan, air-introduced machine, primary air fan and desulfurization The change of system boost blower fan power consumption；
Cost of electricity-generating refers to the cost that electricity is often spent in output, specific as follows：
Cost of electricity-generating=mixed coal coal price × 10-6× coal consumption/100, kw h/ members (32)
Further, rear assessment system module includes security evaluation submodule, for metal pipe-wall temperature, ash erosion with being stained with Dirty characteristic evaluation；
Submodule is assessed in environmental protection, for the assessment of the NOx feature of environmental protection, SO2The feature of environmental protection is assessed and the flue dust feature of environmental protection is assessed；
Economic evaluation submodule, for boiler efficiency, coal consumption assessment, main boiler accessory machinery power consumption, desulfurization and denitrating system Operating cost is assessed.
Wherein, rear assessment system collection SIS in Thermal Power PlantQ (Supervisory Information System in Plant Level, abbreviation SIS) in real time data evaluation scheme corresponding with the system it is whether feasible, comment first Estimate the safety and the feature of environmental protection of the program, if there is the situation for not meeting power plant's standard to be determined as infeasible scheme, burning experience is mixed in typing Storehouse failure case；The scheme for meeting safety and the feature of environmental protection is continued to judge its economy according to power plant's standard, it is poor to economy Scheme be determined as basic feasible solution scheme, the scheme outstanding to economy is determined as proposed projects, the equal typing of both the above scheme Mix burning experience storehouse successful case.

Claims (6)

1. the coal mixing combustion forecast system of assessment system after a kind of band, it is characterised in that including coal mixing combustion module and rear assessment System module；Wherein, coal mixing combustion module is used to formulate coal mixing combustion scheme, and rear assessment system module is used to verify coal mixing combustion The correctness of prediction module conclusion.
2. according to claim 1 after a kind of band assessment system coal mixing combustion forecast system, it is characterised in that coal mixing combustion Prediction module includes
Coal-fired ature of coal is calculated evaluates submodule with coal, for the calculating of mixed coal ature of coal parameter linear model, ature of coal parametrical nonlinearity Model is calculated and coal is evaluated；
Coal-fired spontaneous combustion predicts submodule with mobility, and the ature of coal that submodule is obtained is evaluated with coal for being calculated according to coal-fired ature of coal Parameter, which is calculated, obtains mixed coal ignition quality, coal-fired mobility prediction；
Pulverized coal preparation system runnability predicts submodule, and the ature of coal that submodule is obtained is evaluated with coal for being calculated according to coal-fired ature of coal Parameter calculates and obtains Mill output, coal dust explosion characteristic, coal pulverizer abrasive article life-span；
Burning, slagging trend prediction submodule, the coal that submodule is obtained is evaluated for being calculated according to coal-fired ature of coal with coal in stove Matter parameter, which is calculated, obtains boiler minimum steady combustion load, uncompleted burned carbon heat loss, the slagging trend prediction in burner hearth/screen area；
Submodule is predicted in pollutant emission, based on the ature of coal parameter obtained with coal evaluation submodule is calculated according to coal-fired ature of coal Calculation obtains NOXDischarge capacity, SO2Discharge capacity, dust discharge amount prediction；
Boiler major pant item adaptive forecasting submodule, the coal that submodule is obtained is evaluated for being calculated according to coal-fired ature of coal with coal Matter parameter calculates and obtains pressure fan, primary air fan, deashing device, residue extraction mechanism adaptive forecasting；
Power plant's performance driving economy prediction submodule, the ature of coal ginseng that submodule is obtained is evaluated for being calculated according to coal-fired ature of coal with coal Number calculating obtains intrinsic economy, performance driving economy prediction.
3. according to claim 2 after a kind of band assessment system coal mixing combustion forecast system, it is characterised in that coal-fired ature of coal Calculate and evaluated with coal in submodule, using GB/T7562-98 standards, coal is evaluated, ature of coal during coal-fired ature of coal is calculated Parameter linear model is as follows：
(1) weighted average linear relationship
X=(rAXA+rBXB+rCXC)/(rA+rB+rC) (1)
In formula, X, linear ature of coal parameter；R is mixed coal ratio；
(2) ash content weighted average linear relationship
X=(rAAar,AXA+rBAar,BXB+rCAar,CXC)/(rAAar,A+rBAar,B+rCAar,C) (2)
In formula, Aar is As-received ash content；
Ature of coal parameter non-linear model is as follows：
(1) burning performance parameter nonlinear model
Y=A0+A1 × X1+A2 × X2+ ...+A9 × X9 (3)
Wherein Y represents Ignition Temperature for Blended Coal IT, burn-off rate Bp and slagging index Sc, and Xi is above-mentioned each influence factor or its combination, Ai is coefficient, and each combustibility index and its influence factor are listed in table 1, and regression coefficient is fitted by experiment, and is drawn each burning and referred to Blended Coal Combustion performance evaluation after mark, is carried out according to GB/T7562-98 standards；
The recurrence factor of the Blended Coal Combustion index of table 1
Coefficient A A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 Factor Xi C Vdaf Qnet,ar Aar Mt Ratio1 Vdaf/Aar Vdaf/Mt Qnet,ar/Aar Qnet,ar/Mt
Note 1：Ratio, which refers to, to be mixed in burning coal with respect to the coal ratio preferably burnt；
(2) other ature of coal parameter non-linear models
Maximum coal ash ratio resistance R=(10.23+0.0491 × Al2O3-0.0342×Cfh)10 (4)
In formula, Al2O3For mixed coal ash component；CfhFor unburned combustible in fly ash, %；
The mixed coal ature of coal output table of table 2 and ature of coal collect with coal characteristic index calculating method
4. according to claim 3 after a kind of band assessment system coal mixing combustion forecast system, it is characterised in that
Mixed coal blast, ignition quality are calculated as follows：
<mrow> <msub> <mi>K</mi> <mi>d</mi> </msub> <mo>=</mo> <mfrac> <msub> <mi>V</mi> <mi>d</mi> </msub> <msub> <mi>V</mi> <mrow> <mi>v</mi> <mi>o</mi> <mi>l</mi> <mo>,</mo> <mi>q</mi> <mi>u</mi> <mi>e</mi> </mrow> </msub> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>5</mn> <mo>)</mo> </mrow> </mrow> 2
In formula, KdThe index of expolsibility of-coal dust；VdThe drying base volatile matter of-coal, Vd=Vdaf × (100-Mt)/(100-Aar- Mt), %；VVol, queThe lower limit of flammable volatile matter needed for burning, % when-consideration ash and coke；
<mrow> <msub> <mi>V</mi> <mrow> <mi>v</mi> <mi>o</mi> <mi>l</mi> <mo>,</mo> <mi>q</mi> <mi>u</mi> <mi>e</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>V</mi> <mrow> <mi>v</mi> <mi>o</mi> <mi>l</mi> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>+</mo> <mfrac> <mrow> <mn>100</mn> <mo>-</mo> <msub> <mi>V</mi> <mi>d</mi> </msub> </mrow> <msub> <mi>V</mi> <mi>d</mi> </msub> </mfrac> <mo>)</mo> </mrow> </mrow> <mrow> <mn>100</mn> <mo>+</mo> <msub> <mi>V</mi> <mrow> <mi>v</mi> <mi>o</mi> <mi>l</mi> </mrow> </msub> <mfrac> <mrow> <mn>100</mn> <mo>-</mo> <msub> <mi>V</mi> <mi>d</mi> </msub> </mrow> <msub> <mi>V</mi> <mi>d</mi> </msub> </mfrac> </mrow> </mfrac> <mn>100</mn> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>6</mn> <mo>)</mo> </mrow> </mrow>
Vvol=(1260/Qvol)×100 (7)
Qvol=(QNet, v, daf-78.50×4.1816×FCdaf)/Vdaf (8)
FCdaf=1-Vdaf (9)
In formula, Vvol- do not consider ash and during coke flammable volatile matter needed for burning lower limit, %；QvolThe calorific value of-volatile matter, kJ/ kg；QNet, v, dafThe dry ash free basis low heat valve of-coal, kJ/kg；FCdafThe dry ash free basis of-coal fixes carbon content；Vdaf- The dry ash free basis volatile matter content of coal；
The index of expolsibility K of experiment coal dust is calculated using above-mentioned formuladValue is bigger, and explosion tendency is more serious, and criterion is as follows：
The index of expolsibility of the coal dust of table 3 and the relation of raw coal spontaneous combustion characteristic
The index of expolsibility of coal dust The explosivity of coal dust The spontaneous combustion tendency of raw coal Raw coal pilling up time Kd<1.0 It is low It is low Do not limit 1.0<Kd<3.0 In It is medium Do not limit Kd≥3.0 Easily Easily In 1 month
Coal-fired mobility prediction：
Mf=100 × (Mt-Mad)/(100-Mad), % (10)
MfIt is to the discrimination standard of raw coal mobility：
Mf≤ 8.0% defeated coal is normal
8%<Mf≤ 12.0% is likely to occur run coal bin coal breakage blockage
Mf＞ 12.0% is difficult to safe operation
Mill output is calculated
Flour mill is exerted oneself=Max (BM, BM,d) (11)
(1) B that exerts oneself is groundMCalculate
The modified computing formulae that medium-speed pulverizer grinding is exerted oneself is as follows：
BM=BMO×fH×fR×fM×fA×fg×fe (12)
In formula, BMO- coal pulverizer is exerted oneself substantially, fH、fR、fm、fa、fg、fe- it is respectively grindability, fineness of pulverized coal, raw coal water Part, original coal ash part, raw coal size and part of milling are exerted oneself when wearing up to the middle and later periods reduces the correction factor to pulverizer capacity；
(2) drying capacity of pulverizer BM,dCalculate：
The drying capacity of pulverizer of table 5 is calculated
The coal pulverizer abrasive article life-span calculates：
Coal pulverizer abrasive article life-span=137.34 × Ke4–2257×Ke3+13812×Ke2- 38751 × Ke+48703, hour；
Boiler minimum steady fires carry calculation：
(1) pre- blending is burnt
<mrow> <msub> <mi>D</mi> <mi>min</mi> </msub> <mo>=</mo> <mfrac> <mrow> <mn>25.61</mn> <mo>&amp;times;</mo> <msup> <mi>IT</mi> <mn>2.1825</mn> </msup> </mrow> <mrow> <msup> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>q</mi> <mi>F</mi> </msub> <mo>&amp;times;</mo> <mn>1000</mn> </mrow> <mn>0.287</mn> </mfrac> <mo>)</mo> </mrow> <mn>1.2164</mn> </msup> <mo>&amp;times;</mo> <msup> <msub> <mi>Q</mi> <mrow> <mi>n</mi> <mi>e</mi> <mi>t</mi> <mo>,</mo> <mi>a</mi> <mi>d</mi> </mrow> </msub> <mn>0.5636</mn> </msup> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>13</mn> <mo>)</mo> </mrow> </mrow>
In formula, IT-breeze airflow ignition temperature, DEG C；Qnet,adThe empty butt low heat valve of-coal sample, MJ/kg；qF= qF is designed- boiler at full capacity under design furnace cross, kW/m2；
Qnet,ad={ (Qnet,ar×1000+25Mt)×(100-Mad)/(100-Mt)-25×Mad/4.1816}/1000 (14)
(2) mill is divided to mix burning
The Dmin of each single fire raw coal is calculated, the index of stability Dminh of mixed coal is calculated when carrying out the mill operation of n platforms as the following formula：
Dminh=(Dmin1×Q1+Dmin2×Q2+......+DminN × Qn)/(Q1+Q2+.....+Qn), %
In formula, Dmin1~DminN-First is milled to n-th coal-fired index of stability that catches fire of mill, is calculated by formula (13)；Q1~ Qn-First is milled to the coefficient of n-th coal-fired index of stability that catches fire of mill；
Uncompleted burned carbon heat loss is calculated：
(1) pre- blending is burnt
<mrow> <msub> <mi>q</mi> <mn>4</mn> </msub> <mo>=</mo> <mfrac> <mrow> <msup> <msub> <mi>q</mi> <mi>v</mi> </msub> <mn>1.9291</mn> </msup> <mo>&amp;times;</mo> <msup> <mn>10</mn> <mn>16</mn> </msup> <mo>&amp;times;</mo> <msup> <mi>RI</mi> <mn>1.4337</mn> </msup> </mrow> <mrow> <msup> <msub> <mi>q</mi> <mi>F</mi> </msub> <mn>2.4550</mn> </msup> <mo>&amp;times;</mo> <msup> <msub> <mi>B</mi> <mn>2</mn> </msub> <mn>9.48</mn> </msup> <mo>&amp;times;</mo> <msup> <msub> <mi>Q</mi> <mrow> <mi>n</mi> <mi>e</mi> <mi>t</mi> <mo>,</mo> <mi>a</mi> <mi>d</mi> </mrow> </msub> <mn>2.0921</mn> </msup> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>15</mn> <mo>)</mo> </mrow> </mrow>
In formula, qV- boiler actual heating load parameter, qV=actual load/BMCR operating modes thermic load × qV,BMCR；qF- boiler is real Border thermic load parameter, qF=actual load/BMCR operating modes thermic load × qF,BMCR, B2 is the burn-off rate of operating mode two；
(2) mill is divided to mix burning
Distance of each mill burner away from screen bottom determines the after-flame degree of the coal-grinding coal, the q4h of mixed coal when calculating the mill operation of n platforms：
Q4h=(q41/L1+q42/L2+ ...+q4n/Ln)/(1/L1+1/L2+ ...+1/Ln), % (16)
In formula, q41~~q4n-First is milled to n-th coal-fired q4 value of mill；L1~Ln-it is respectively first layer and n-th layer Burner is milled to the distance at screen bottom；
The slagging trend prediction in burner hearth/screen area：
(1) pre- blending is burnt
Premix mode lower hearth has identical slagging trend with screen area, and Boiler Furnace slagging characteristic is differentiated with slagging index Su, calculates Formula is as follows：
In formula, SU coals- be coal sample slagging index；
qF- negative the kW/m of section of burner hearth heat under the corresponding load of boiler2, qF=actual load/BMCR operating modes thermic load × qF,BMCR；
The ash erosion index and slag formation at platen zone index calculated is by following grade discrimination：
Su More than 5 5-4 4-3 3-2 Less than 2 Differentiate grade Seriously It is high Middle height In It is low
(2) mill is divided to mix burning
Mill is divided to mix under burning mode, the Su that Boiler Furnace slagging index is directly calculated with mixed coal data；And n platforms mill operation Shi Ping areas knot Slagging index Suh is calculated as follows：
Suh=(Su1 × Q1+Su2 × Q2+ ...+Sun × Qn)/(Q1+Q2+ ...+Qn) (18)
In formula, Su1~Sun-be milled to n-th coal-fired slagging index value of mill for First；
Q1~Qn-coal-fired influence the coefficient to slag formation at platen zone of difference mill；
NOXDischarge capacity, SO2Discharge capacity, dust discharge amount prediction are calculated；
(1) NOx emission predictive
NOx=(1182.978 × Nar- 0.9338934 × Vdaf×Qnet,ar+0.0063/Vdaf- 17.021/Vdaf/Nar+ 491.9144)×FH×FO2×K,mg/m3 (19)
In formula, FH- it is load correction value；
FO2- it is operation oxygen amount correction value；
K-and it is unit correction value, it is modified by calculated value with actual value gap；
By actual NOx generation amount, predict whether the disposal ability of denitrating system is up to standard, no denitrating system then judges that NOx is arranged It is high-volume whether exceeded；
(2)SO2Forecasting of discharged quantity
From desulfurization degree ηSCalculation formula it is as follows：
ηS=33.31-0.925 × Qnet, ar)+7.62 × Ks,self, % (20)
In formula, Ks,self, the calcium to sulphur mole ratio of coal itself, Ks,self=0.00571 × 0.90 × Aar×CaO/St,ar；
Theoretical SO2Discharge capacity SO2' calculated as the following formula：
SO2'=20000 × St,ar/Vgy,mg/m3 (21)
In formula, Vgy- theory dry flue gas amount, m3/ kg, Vgy=1.866 × (Car+0.375×St,ar)/100+0.79×Vgk+0.4 ×Vgk；
Vgk- theory dry air amount, m3/ kg, Vgk=0.089 × (Car+0.375 × St,ar)+0.265×Har-0.0333×Oar；
Then actual SO2Discharge capacity is：
SO2=(100- ηS)/100×SO2', mg/m3 (22)
Pass through actual SO2Growing amount, predicts whether the disposal ability of desulphurization system is up to standard；
(3) dust discharge amount is predicted
Actual ash quantity A=Aar × 0.90 × Coal-fired capacity (23)
In formula, the percentage of Aar-mixed coal ash quantity；
Dust collection efficiency：η c=[1-exp (- A × K1×K2×K3)]×(KY×Kt)×100 (24)
In formula, η c are the efficiency of dust collection after correction；
A designs numerical constant for deduster；
K1, K2, K3 are respectively sulphur content, ash content, the correction coefficient of ratio resistance；
Dust emission concentration=0.9 × ash content Aar/100 × 106× (100- dust collection efficiencies)/100/ exhaust gas volumn, mg/m3 (25)
Pressure fan adaptive computation：
VPF=primary air ratio × Vk (26)
V in formulaPFFor air quantity, VkTo give amount of actual air for combustion；
The primary air flow that calculating is obtained is compared with primary air fan design load, judges the adaptability of blower fan；
Pressure fan adaptive computation：
VPF=(1- primary air ratios) × Vk × enters stove fuel quantity (27)
The air output that calculating is obtained is compared with pressure fan design load, judges the adaptability of blower fan；
Ash discharge residue extraction mechanism adaptive computation：
Slag amount=total lime-ash amount × (100- μ)/100 (28)
Table slag amount ratio μ and the relation of actual slagging in stove
Sequence number Calculation formula Adapt to interval 1 μ=10% Actual slagging index Su in stove:<3.0 2 μ=(5 × Su-5) % Actual slagging index Su in stove:≥3.0
The slag amount that calculating is obtained is compared with design load, judges the adaptability of ash discharge residue extraction mechanism adaptability；
Intrinsic its economic prediction：
Intrinsic economy is tried to achieve by the weighted average of each single coal coal price in proportion：
Mh=X1/100·M1+X2/100·M2+…… (29)
MhThe actual coal price of-mixed coal, yuan/ton；
M1、M2...-feed coal 1,2 ... actual coal price, yuan/ton；
X1、X2...-feed coal 1,2 ... ratio, %；
The standard coal price for mixing burning coal and mixed coal is then tried to achieve as follows：
M1b=M1·29.27/(Qnet,ar)1(29)
M2b=M2·29.27/(Qnet,ar)2(29)
......
Mhb=Mh·29.27/(Qnet,ar)h(29)
In formula, M1b、M2b、MhbThe standard coal price of-feed coal 1,2 and mixed coal, yuan/ton；
(Qnet,ar)1、(Qnet,ar)2、(Qnet,ar)hThe low heat valve of-feed coal 1,2 and mixed coal, MJ/kg；
Performance driving economy is predicted；
Only in boiler accommodation, the change of ature of coal parameter is to the maximum boiler efficiency of economic influence and major pant item electricity Consumption change carries out coal consumption variation prediction；
Δ MH=Δs MHglxl+ΔMHfjdh (30)
Wherein, Δ MHglxlInfluence of the boiler efficiency to coal consumption：
In formula, MHGross coal consumption rateFor design gross coal consumption rate, Δ MHfjdhInfluence of the subsidiary engine power consumption to coal consumption；
Considering the power consumption change of boiler major pant item includes：Coal pulverizer, pressure fan, air-introduced machine, primary air fan and desulphurization system The change of booster fan power consumption；
Cost of electricity-generating refers to the cost that electricity is often spent in output, specific as follows：
Cost of electricity-generating=mixed coal coal price × 10-6× coal consumption/100, kw h/ members (32)
5. according to claim 2 after a kind of band assessment system coal mixing combustion forecast system, it is characterised in that it is rear to assess system System module includes,
Security evaluation submodule, is assessed for metal pipe-wall temperature, ash erosion and fouling characteristics；
Submodule is assessed in environmental protection, for the assessment of the NOx feature of environmental protection, SO2The feature of environmental protection is assessed and the flue dust feature of environmental protection is assessed；
Economic evaluation submodule, for the operation of boiler efficiency, coal consumption assessment, main boiler accessory machinery power consumption, desulfurization and denitrating system Assessment of cost.
6. according to claim 5 after a kind of band assessment system coal mixing combustion forecast system, it is characterised in that it is rear to assess system Whether real time data evaluation scheme corresponding with the system is feasible in system collection SIS in Thermal Power PlantQ, firstly evaluates The safety and the feature of environmental protection of the program, if there is the situation for not meeting power plant's standard to be determined as infeasible scheme, burning experience storehouse is mixed in typing Failure case；The scheme for meeting safety and the feature of environmental protection is continued to judge its economy according to power plant's standard, it is poor to economy Scheme is determined as basic feasible solution scheme, and the scheme outstanding to economy is determined as proposed projects, and the equal typing of both the above scheme is mixed Burning experience storehouse successful case.
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