CN105091944A - Thermal power plant set coal-fired calorific value and coal consumption rate index online monitoring method - Google Patents

Abstract

The invention discloses a thermal power plant set coal-fired calorific value and coal consumption rate index online monitoring method. According to the thermal power plant set coal-fired calorific value and coal consumption rate index online monitoring method, based on operating parameters of the normal operation of a set, the coal-fired calorific value and coal consumption rate index of the set in normal operation can be accurately determined through specific calculation methods, and therefore, a difficulty of incapability of monitoring the coal-fired calorific value and coal consumption rate index of the set in normal operation can be eliminated. Field data adopted in the method can be measured with easiness. The monitoring method is simple and feasible and can realize the possibility of accurately monitoring the coal-fired calorific value and coal consumption rate index of the set.

Description

The method of a kind of fuel-burning power plant unit coal-burning calorific capacity and coa consumption rate index on-line monitoring

Technical field

The present invention relates to the method for a kind of fuel-burning power plant unit coal-burning calorific capacity and coa consumption rate index on-line monitoring.

Background technology

In thermal power generation unit, coal-fired calorific capacity and coa consumption rate index are very important monitoring indexes.But because coal-fired calorific capacity needs certain test in laboratory to obtain exact value usually, this brings very large difficulty to this index of real time monitoring, and this Real-Time Monitoring that also directly results in the coa consumption rate index of Power Plant cannot realize.

Therefore in the urgent need to a kind of based on field measurement data, current problems faced can be solved to the method for fuel-burning power plant unit coal-burning calorific capacity and coa consumption rate index on-line monitoring.

Summary of the invention

The object of the invention is, based on the above state of the art, provide the method for a kind of fuel-burning power plant unit coal-burning calorific capacity and coa consumption rate index on-line monitoring.

The present invention adopts following technical scheme:

A method for fuel-burning power plant unit coal-burning calorific capacity and coa consumption rate index on-line monitoring, it comprises the following steps:

(1) correct according to the operational factor of unit performance test method to unit in ASME standard, and set up drift correction value or the correction factor of each primary operating parameter, concrete steps are as follows:

1) according to the Turbine Performance Test code in ASMEPTC6, the primary operating parameter that steamer pusher side participates in heat consumption calculating is corrected, and set up drift correction value or the correction factor of each primary operating parameter, the primary operating parameter that described participation heat consumption calculates comprises:

Steam turbine main steam initial steam pressure and throttle (steam) temperature;

Steam turbine high-pressure cylinder exhaust steam pressure and exhaust temperature;

Steam turbine reheat heat steam initial steam pressure and throttle (steam) temperature;

Feedwater resulting pressure and feed temperature;

The feedwater inflow temperature of each high-pressure heater and feedwater leaving water temperature;

Draw gas initial steam pressure and the throttle (steam) temperature of each high-pressure heater;

The drain temperature of each high-pressure heater;

Oxygen-eliminating device incoming condensing water pressure and condensing water temperature;

The initial steam pressure that oxygen-eliminating device correspondence is drawn gas and throttle (steam) temperature;

The outlet feed temperature of oxygen-eliminating device;

The overheated attemperator attemperation water flow of boiler one-level, desuperheating water temperature;

Boiler secondary superheater attemperator attemperation water flow, desuperheating water temperature; And

Boiler reheating attemperator attemperation water flow, desuperheating water temperature;

2) Turbine Performance Test is carried out according to the Turbine Performance Test code in ASMEPTC6:

A) test flow benchmark adopts oxygen-eliminating device incoming condensing water flow, and flow measuring element is the ASME flow nozzle required in standard;

B) the final feedwater flow adopting test accurate Calculation to obtain corrects the feedwater flow shown in DCS, calculates correction coefficient K _fwf;

$K_{fwf}=\frac{F_{fwASME}}{F_{fwDCS}}$

In formula, K _fwffor the correction coefficient of final feedwater flow; F _fwASMEfor the calculated value of the final accurately feedwater flow according to the acquisition of ASME steam turbine testing standard; F _fwDCSfor the final feedwater flow value of DCS display;

C) according to the computing method in ASMEPTC6, the heat consumption Q of Steam Turbine is calculated _tI, the heat consumption of Steam Turbine and the input heat of steam turbine;

3) according to the boiler controller system performance test code in ASMEPTC4, each primary operating parameter that boiler side participates in boiler efficiency calculating is corrected, set up the drift correction value of each primary operating parameter, the primary operating parameter that described participation boiler efficiency calculates comprises:

Environment temperature, i.e. dry-bulb temperature;

Wet-bulb temperature;

Economizer input gas temperature;

Economizer exit flue-gas temperature;

Air preheater inlet air temperature;

Air preheater input gas temperature;

Exhaust gas temperature;

End slag temperature;

Flue dust temperature;

Enter stove fuel temperature;

Coal pulverizer outlet air temperature;

Air preheater fume side outlet oxygen amount;

Air preheater fume side import oxygen amount;

Unburned carbon in flue dust;

Carbon content in the bottom ash;

4) carry out boiler efficiency performance test according to the boiler performance test code of ASMEPTC4, this step and step 2) described in Turbine Performance Test carry out simultaneously, this step is specific as follows:

A) obtain coal sample according to the sampling method in described boiler performance test code, high-order calorific capacity and ultimate analysis are carried out to it;

B) the effective quantity of heat given up Q of boiler is calculated according to the following formula _bO:

$Q_{BO}=\frac{Q_{TI}}{{\mathrm{\η}}_p}\×100$

In formula, Q _bOfor effective quantity of heat given up of boiler, unit kJ/h;

Q _tIfor the heat consumption of Turbine Performance Test, i.e. steam turbine input heat, unit kJ/h;

η _pfor pipeline efficiency, unit %, for capacity 300MW and above unit, gets 99.5%;

C) according to the boiler efficiency computing method in ASMEPTC4, final boiler fired coal amount B is calculated _t;

$B_T=\frac{Q_{BO}}{{\mathrm{\η}}_{BT}\×HHV}\×100$

In formula, B _tfor testing the boiler fired coal amount obtained, units/kg/h;

η _bTfor the boiler efficiency that experiment calculation obtains, unit %;

HHV is steps A) in the high-order calorific capacity that obtains, unit kJ/kg;

D) according to testing the final boiler fired coal amount B obtained _tand the Coal-fired capacity B shown in on-the-spot DCS _dCS, calculate the correction coefficient K of Coal-fired capacity _bF.

$K_{BF}=\frac{B_T}{B_{DCS}};$

In formula, K _bFfor the correction coefficient of Coal-fired capacity; B _tfor the calculated value of the amount of boiler fired coal accurately according to the acquisition of ASME boiler test standard; B _dCSfor the Coal-fired capacity of DCS display.Before boiler carries out formal ASME efficiency test, should first calibrate Coal-fired capacity measurement mechanism such as the belt type weighing formula feeder of DCS display;

(2) the normal operational factor of unit is adopted to carry out the calculating of unit coal-burning calorific capacity and coa consumption rate index;

1) steamer pusher side participates in the correcting process of each primary operating parameter that heat consumption calculates:

In normally running according to unit, steamer pusher side participates in each primary operating parameter that heat consumption calculates, in integrating step (1) the 1st) each parameter error modified value that step obtains, calculate the revised numerical value of each primary operating parameter; The primary operating parameter that described participation heat consumption calculates is with in step (1) the 1st) listed by step, parameter is identical;

2) calculating of thermal loss of steam turbine amount in normally running:

With final feedwater flow for benchmark, calculate normal operating thermal loss of steam turbine amount Q _tI'; Heat consumption adopts the final feedwater flow F of the correction through calibration in calculating _fw'; Thermal loss of steam turbine amount Q _tI' calculating carry out according to the formula provided in Turbine Performance Test standard.

Through the final feedwater flow F of the correction of calibration _fw' adopt following formula to calculate:

F _fw’＝K _fwf×F _fwDCS

In formula, F _fw' be the final feedwater flow of correction through calibration; K _fwffor in step (1) the 2nd) correction coefficient of final feedwater flow that obtains of step; F _fwDCSfor the final feedwater flow value of DCS display;

3) boiler side participates in the correcting process of each primary operating parameter that boiler efficiency calculates:

In normally running according to unit, boiler side participates in each primary operating parameter that boiler efficiency calculates, in integrating step (1) 3) each parameter error modified value that step obtains, calculate the revised numerical value of each primary operating parameter of boiler side; Participating in primary operating parameter that boiler efficiency calculates with in step (1) 3) listed by step, parameter is identical;

4) unit normally run in the calculating of coal burning caloricity HHV ':

A) the normal operating quantity of heat given up Q of boiler _bO' be calculated as follows:

${Q_{BO}}^{,}=\frac{{Q_{TI}}^{,}}{{\mathrm{\η}}_p}\×100;$

In formula, Q _bO' be the normal operating quantity of heat given up of boiler, unit kJ/h; Q _tI' be the heat consumption of steam turbine in normal operation, i.e. steam turbine input heat, unit kJ/h; η _pfor pipeline efficiency, unit %; For capacity 300MW and above unit, get 99.5%;

B) the Coal-fired capacity B that boiler is revised in normally running _t' be calculated as follows:

B _T’＝K _BF×B _DCS’

In formula, B _t' be revised Coal-fired capacity accurately in normal operation; K _bFfor in step (1) 4) the boiler fired coal quantity correction coefficient that obtains in step; B _dCS' be the Coal-fired capacity that in normal operation, DCS shows;

C) coal elements analysis data when boiler up-time efficiency calculates directly adopt coal qualities test Elemental analysis data during performance test, or adopt the coal qualities test Elemental analysis data regularly carried out;

D) unburned carbon in flue dust when boiler up-time efficiency calculates and carbon content in the bottom ash data, as on-the-spot without on-line measurement device time, then directly adopt boiler efficiency performance test time unburned carbon in flue dust and ash content carbon data, or adopt periodic analysis obtain unburned carbon in flue dust and carbon content in the bottom ash data;

When E) calculating coal-fired calorific capacity in normal operation, according to following steps:

A. the high-order calorific capacity HHV of a certain fire coal is supposed _tRYboiler efficiency iterative computation is carried out according to the method for ASMEPTC4 boiler efficiency standard; Comprise according to data: the normal operating quantity of heat given up Q of boiler _bO', the revised numerical value of each primary operating parameter of boiler side, aforementioned in the coal elements that provides analyze data and unburned carbon in flue dust and carbon content in the bottom ash data;

B. according to the boiler up-time efficiency that iteration obtains, the boiler fired coal amount B obtained according to the high-order calorific capacity of the fire coal supposed is calculated _tRY;

$B_{TRY}=\frac{{Q_{BO}}^{,}}{{\mathrm{\η}}_{BTRY}\×{\mathrm{HHV}}_{TRY}}\×100$

In formula, B _tRYfor the boiler fired coal amount obtained according to the coal-fired high-order calorific capacity of hypothesis, units/kg/h;

η _bTRYfor the boiler efficiency obtained according to the coal-fired high-order calorific capacity of hypothesis, unit %;

HHV _tRYthe high-order calorific capacity of fire coal for hypothesis, unit kJ/kg;

C. boiler fired coal amount B is compared _tRYcoal-fired capacity B revised in normally running with boiler _t', as Δ B=|B _tRY-B _t' |≤0.1, then calculate end, normal operating fire coal high-order calorific capacity the HHV '=HHV of boiler _tRY; Otherwise return step a., again suppose HHV _tRYcalculate;

5) unit normally run in coa consumption rate index b _f' calculating

On the basis calculating coal-fired gross calorific value HHV ' in normal operation, calculate gross coal consumption rate index b in normal operation by following formula _f':

${b_f}^{,}=\frac{{B_T}^{,}\×{\mathrm{HHV}}^{,}}{P_G\×{\mathrm{HHV}}_{STD}}\×1000$

In formula, b _f' be unit coa consumption rate index in normal operation, unit g/kW.h;

P _gfor unit generation power, unit kW;

HHV _sTDfor the high-order calorific capacity of the fire coal for calculating based on the standard coal equivalent low heat value of national Specification, be constant, unit kJ/kg.

In calibration steps of the present invention and normally operation, the calculating of boiler efficiency is all carried out based on ASMEPTC4 standard, and the computing method that this standard provides provide the corresponding coupled relation of a kind of boiler quantity of heat given up, boiler efficiency and Coal-fired capacity.

The beneficial effect adopting technique scheme to produce is:

Patent of the present invention is based on the normal operating operational factor of unit, by specifically calibrating and computing method, unit coal-burning calorific capacity and coa consumption rate index in normal operation can be determined exactly, solving the coal-fired calorific capacity of unit in normal operation and unit coa consumption rate index cannot the difficult problem of accurate measurements, for power plant normally run in the coal-fired calorific capacity of on-line monitoring and unit coa consumption rate index provide according to and method, both met the needs that economy of power plant is analyzed, and also can be and realize the energy-saving distribution of electrical network to Power Plant from now on foundation and guidance are provided.

Embodiment

Below in conjunction with specific embodiment, technical scheme of the present invention is described in detail.

A method for fuel-burning power plant unit coal-burning calorific capacity and coa consumption rate index on-line monitoring, it comprises the following steps:

(1) correct according to the operational factor of unit performance test method to unit in ASME standard, and set up drift correction value or the correction factor of each primary operating parameter, concrete steps are as follows:

1) according to the Turbine Performance Test code in ASMEPTC6, the primary operating parameter that steamer pusher side participates in heat consumption calculating is corrected, and set up drift correction value or the correction factor of each primary operating parameter, the primary operating parameter that described participation heat consumption calculates comprises:

Steam turbine main steam initial steam pressure and throttle (steam) temperature;

Steam turbine high-pressure cylinder exhaust steam pressure and exhaust temperature;

Steam turbine reheat heat steam initial steam pressure and throttle (steam) temperature;

Feedwater resulting pressure and feed temperature;

The feedwater inflow temperature of each high-pressure heater and feedwater leaving water temperature;

Draw gas initial steam pressure and the throttle (steam) temperature of each high-pressure heater;

The drain temperature of each high-pressure heater;

Oxygen-eliminating device incoming condensing water pressure and condensing water temperature;

The initial steam pressure that oxygen-eliminating device correspondence is drawn gas and throttle (steam) temperature;

The outlet feed temperature of oxygen-eliminating device;

The overheated attemperator attemperation water flow of boiler one-level, desuperheating water temperature;

Boiler secondary superheater attemperator attemperation water flow, desuperheating water temperature; And

Boiler reheating attemperator attemperation water flow, desuperheating water temperature;

2) Turbine Performance Test is carried out according to the Turbine Performance Test code in ASMEPTC6:

A) test flow benchmark adopts oxygen-eliminating device incoming condensing water flow, and flow measuring element is the ASME flow nozzle required in standard;

B) the final feedwater flow adopting test accurate Calculation to obtain corrects the feedwater flow shown in DCS, calculates correction coefficient K _fwf;

$K_{fwf}=\frac{F_{fwASME}}{F_{fwDCS}}$

In formula, K _fwffor the correction coefficient of final feedwater flow; F _fwASMEfor the calculated value of the final accurately feedwater flow according to the acquisition of ASME steam turbine testing standard; F _fwDCSfor the final feedwater flow value of DCS display;

C) according to the computing method in ASMEPTC6, the heat consumption Q of Steam Turbine is calculated _tI, the heat consumption of Steam Turbine and the input heat of steam turbine;

Certain 600MW unit, has carried out the test of operating mode at full capacity in Turbine Performance Test, and verifies steam turbine side important parameter.

According to ASME principle of measurement, the heat consumption calculating steam turbine is Q _tI=4.6760E+09kJ/h.

3) according to the boiler controller system performance test code in ASMEPTC4, each primary operating parameter that boiler side participates in boiler efficiency calculating is corrected, set up the drift correction value of each primary operating parameter, the primary operating parameter that described participation boiler efficiency calculates comprises:

Environment temperature, i.e. dry-bulb temperature;

Wet-bulb temperature;

Economizer input gas temperature;

Economizer exit flue-gas temperature;

Air preheater inlet air temperature;

Air preheater input gas temperature;

Exhaust gas temperature;

End slag temperature;

Flue dust temperature;

Enter stove fuel temperature;

Coal pulverizer outlet air temperature;

Air preheater fume side outlet oxygen amount;

Air preheater fume side import oxygen amount;

Unburned carbon in flue dust;

Carbon content in the bottom ash;

4) carry out boiler efficiency performance test according to the boiler performance test code of ASMEPTC4, this step and step 2) described in Turbine Performance Test carry out simultaneously, this step is specific as follows:

A) obtain coal sample according to the sampling method in described boiler performance test code, high-order calorific capacity and ultimate analysis are carried out to it;

B) the effective quantity of heat given up Q of boiler is calculated according to the following formula _bO:

$Q_{BO}=\frac{Q_{TI}}{{\mathrm{\η}}_p}\×100$

In formula, Q _bOfor effective quantity of heat given up of boiler, unit kJ/h;

Q _tIfor the heat consumption of Turbine Performance Test, i.e. steam turbine input heat, unit kJ/h;

η _pfor pipeline efficiency, unit %, for capacity 300MW and above unit, gets 99.5%;

According to Q _tI=4.6760E+09kJ/h, can calculate Q _bO=4.7E+09kJ/h.

C) according to the boiler efficiency computing method in ASMEPTC4, final boiler fired coal amount B is calculated _t;

$B_T=\frac{Q_{BO}}{{\mathrm{\η}}_{BT}\×HHV}\×100$

In formula, B _tfor testing the boiler fired coal amount obtained, units/kg/h;

η _bTfor the boiler efficiency that experiment calculation obtains, unit %;

HHV is steps A) in the high-order calorific capacity that obtains, unit kJ/kg;

The boiler efficiency calculated in boiler test is 89.062%, and in test, the high-order calorific capacity of coal sample is 26645.13kJ/kg, can calculate boiler fired coal amount B _t=198039.492kg/h.

D) according to testing the final boiler fired coal amount B obtained _tand the Coal-fired capacity B shown in on-the-spot DCS _dCS, calculate the correction coefficient K of Coal-fired capacity _bF.

$K_{BF}=\frac{B_T}{B_{DCS}};$

In formula, K _bFfor the correction coefficient of Coal-fired capacity; B _tfor the calculated value of the amount of boiler fired coal accurately according to the acquisition of ASME boiler test standard; B _dCSfor the Coal-fired capacity of DCS display.Before boiler carries out formal ASME efficiency test, should first calibrate Coal-fired capacity measurement mechanism such as the belt type weighing formula feeder of DCS display;

(2) the normal operational factor of unit is adopted to carry out the calculating of unit coal-burning calorific capacity and coa consumption rate index;

1) steamer pusher side participates in the correcting process of each primary operating parameter that heat consumption calculates:

In normally running according to unit, steamer pusher side participates in each primary operating parameter that heat consumption calculates, in integrating step (1) the 1st) each parameter error modified value that step obtains, calculate the revised numerical value of each primary operating parameter; The primary operating parameter that described participation heat consumption calculates is with in step (1) the 1st) listed by step, parameter is identical;

2) calculating of thermal loss of steam turbine amount in normally running:

With final feedwater flow for benchmark, calculate normal operating thermal loss of steam turbine amount Q _tI'; Heat consumption adopts the final feedwater flow F of the correction through calibration in calculating _fw'; Thermal loss of steam turbine amount Q _tI' calculating carry out according to the formula provided in Turbine Performance Test standard.

Through the final feedwater flow F of the correction of calibration _fw' adopt following formula to calculate:

F _fw’＝K _fwf×F _fwDCS

In formula, F _fw' be the final feedwater flow of correction through calibration; K _fwffor in step (1) the 2nd) correction coefficient of final feedwater flow that obtains of step; F _fwDCSfor the final feedwater flow value of DCS display;

Above-mentioned 600MW unit, during steam turbine normally runs, according to ASME principle of measurement, according to the feedwater flow after correction and other operational factor, the heat consumption calculating steam turbine in normal operation is Q _tI'=4.7267E+09kJ/h.

3) boiler side participates in the correcting process of each primary operating parameter that boiler efficiency calculates:

In normally running according to unit, boiler side participates in each primary operating parameter that boiler efficiency calculates, in integrating step (1) 3) each parameter error modified value that step obtains, calculate the revised numerical value of each primary operating parameter of boiler side; Participating in primary operating parameter that boiler efficiency calculates with in step (1) 3) listed by step, parameter is identical;

4) unit normally run in the calculating of coal burning caloricity HHV ':

A) the normal operating quantity of heat given up Q of boiler _bO' be calculated as follows:

${Q_{BO}}^{,}=\frac{{Q_{TI}}^{,}}{{\mathrm{\η}}_p}\×100;$

In formula, Q _bO' be the normal operating quantity of heat given up of boiler, unit kJ/h; Q _tI' be the heat consumption of steam turbine in normal operation, i.e. steam turbine input heat, unit kJ/h; η _pfor pipeline efficiency, unit %; For capacity 300MW and above unit, get 99.5%;

According to Q _tI'=4.7267E+09kJ/h, can calculate Q _bO'=4.7504E+09kJ/h.

B) the normal operating Coal-fired capacity B of boiler _t' be calculated as follows:

B _T’＝K _BF×B _DCS’

In formula, B _t' be revised Coal-fired capacity accurately in normal operation; K _bFfor in step (1) 4) the boiler fired coal quantity correction coefficient that obtains in step; B _dCS' be the Coal-fired capacity that in normal operation, DCS shows;

According to the correction coefficient calculated in aligning step, calculate the revised B of Coal-fired capacity accurately in normal operation _t'=201852kg/h.

C) coal elements analysis data when boiler up-time efficiency calculates directly adopt coal qualities test Elemental analysis data during performance test, or adopt the coal qualities test Elemental analysis data regularly carried out;

D) unburned carbon in flue dust when boiler up-time efficiency calculates and carbon content in the bottom ash data, as on-the-spot without on-line measurement device time, then directly adopt boiler efficiency performance test time unburned carbon in flue dust and ash content carbon data, or adopt periodic analysis obtain unburned carbon in flue dust and ash content carbon data;

When E) calculating coal-fired calorific capacity in normal operation, according to following steps:

A. the high-order calorific capacity HHV of a certain fire coal is supposed _tRY, carry out boiler efficiency iterative computation according to the method for ASMEPTC4 boiler efficiency standard; Comprise according to data: the normal operating quantity of heat given up Q of boiler _bO', the revised numerical value of each primary operating parameter of boiler side, aforementioned in the coal elements that provides analyze data and unburned carbon in flue dust and carbon content in the bottom ash data;

B. according to the boiler up-time efficiency that iteration obtains, the boiler fired coal amount B obtained according to the high-order calorific capacity of the fire coal supposed is calculated _tRY;

$B_{TRY}=\frac{{Q_{BO}}^{,}}{{\mathrm{\η}}_{BTRY}\×{\mathrm{HHV}}_{TRY}}\×100$

In formula, B _tRYfor the boiler fired coal amount obtained according to the coal-fired high-order calorific capacity of hypothesis, units/kg/h;

η _bTRYfor the boiler efficiency obtained according to the coal-fired high-order calorific capacity of hypothesis, unit %;

HHV _tRYthe high-order calorific capacity of fire coal for hypothesis, unit kJ/kg;

C. boiler fired coal amount B is compared _tRYcoal-fired capacity B revised in normally running with boiler _t', as Δ B=|B _tRY-B _t' |≤0.1, then calculate end, normal operating fire coal high-order calorific capacity the HHV '=HHV of boiler _tRY; Otherwise return step a., again suppose HHV _tRYcalculate;

Assuming that coal-fired high-order high heat value is 26447.74kJ/kg, it is 88.9836% that establishing criteria calculates boiler efficiency, the normal operating quantity of heat given up 4.7504E+09kJ/h of boiler, can calculate boiler fired coal amount corresponding under this supposes high-order calorific capacity is 201852.86kg/h.And the revised B of Coal-fired capacity accurately in normally running _t'=201852kg/h, both meet control overflow at deviation.Therefore, high-order high heat value coal-fired in final normal operation is 26447.74kJ/kg.

5) unit normally run in coa consumption rate index b _f' calculating

On the basis calculating coal-fired gross calorific value HHV ' in normal operation, calculate gross coal consumption rate index b in normal operation by following formula _f':

${b_f}^{,}=\frac{{B_T}^{,}\×{\mathrm{HHV}}^{,}}{P_G\×{\mathrm{HHV}}_{STD}}\×1000$

In formula, b _f' be unit coa consumption rate index in normal operation, unit g/kW.h;

P _gfor unit generation power, unit kW;

HHV _sTDfor the high-order calorific capacity of the fire coal for calculating based on the standard coal equivalent low heat value of national Specification, be constant, unit kJ/kg.

In national standard, specified standard coal low heat value is 29308kJ/kg, and according to ASME standard, between high-order calorific capacity and low heat value, conversion formula is:

LHV＝HHV-24.416*(H2×8.937+H2O)

In formula, LHV is coal-fired low heat value, kJ/kg; HHV is coal-fired high-order calorific capacity, kJ/kg; H2 is hydrogen richness in coal-fired ultimate analysis, %; H2O is liquid water content in coal-fired ultimate analysis, %.

In the present embodiment, H2=4.315, H2O=10.05 in the ultimate analysis of ature of coal, therefore based on the high-order calorific capacity HHV of fire coal that the standard coal equivalent low heat value of national Specification calculates _sTD=30494.94kJ/kg.

During unit normally runs, actual motion load is 601352kW, therefore gross coal consumption rate index b in normal operation _f' be:

${b_f}^{,}=\frac{{B_T}^{,}\×{\mathrm{HHV}}^{,}}{P_G\×{\mathrm{HHV}}_{STD}}\×1000=\frac{201852\×26447.74}{601352\×30494.94}\×1000=291.115g/kW.h.$

Claims (1)

1. a method for fuel-burning power plant unit coal-burning calorific capacity and coa consumption rate index on-line monitoring, is characterized in that comprising the following steps:

(1) correct according to the operational factor of unit performance test method to unit in ASME standard, and set up drift correction value or the correction factor of each primary operating parameter, concrete steps are as follows:

1) according to the Turbine Performance Test code in ASMEPTC6, the primary operating parameter that steamer pusher side participates in heat consumption calculating is corrected, and set up drift correction value or the correction factor of each primary operating parameter, the primary operating parameter that described participation heat consumption calculates comprises:

Steam turbine main steam initial steam pressure and throttle (steam) temperature;

Steam turbine high-pressure cylinder exhaust steam pressure and exhaust temperature;

Steam turbine reheat heat steam initial steam pressure and throttle (steam) temperature;

Feedwater resulting pressure and feed temperature;

The feedwater inflow temperature of each high-pressure heater and feedwater leaving water temperature;

Draw gas initial steam pressure and the throttle (steam) temperature of each high-pressure heater;

The drain temperature of each high-pressure heater;

Oxygen-eliminating device incoming condensing water pressure and condensing water temperature;

The initial steam pressure that oxygen-eliminating device correspondence is drawn gas and throttle (steam) temperature;

The outlet feed temperature of oxygen-eliminating device;

The overheated attemperator attemperation water flow of boiler one-level, desuperheating water temperature;

Boiler secondary superheater attemperator attemperation water flow, desuperheating water temperature; And

Boiler reheating attemperator attemperation water flow, desuperheating water temperature;

2) Turbine Performance Test is carried out according to the Turbine Performance Test code in ASMEPTC6:

A) test flow benchmark adopts oxygen-eliminating device incoming condensing water flow, and flow measuring element is the ASME flow nozzle required in ASMEPTC6 standard;

B) the final feedwater flow adopting test accurate Calculation to obtain corrects the feedwater flow shown in DCS, calculates correction coefficient K _fwf;

$K_{fwf}=\frac{F_{fwASME}}{F_{fwDCS}}$

In formula, K _fwffor the correction coefficient of final feedwater flow; F _fwASMEfor the calculated value of the final accurately feedwater flow according to the acquisition of ASME steam turbine testing standard; F _fwDCSfor the final feedwater flow value of DCS display;

C) according to the computing method in ASMEPTC6, the heat consumption Q of Steam Turbine is calculated _tI, the heat consumption of Steam Turbine and the input heat of steam turbine;

3) according to the boiler controller system performance test code in ASMEPTC4, each primary operating parameter that boiler side participates in boiler efficiency calculating is corrected, set up the drift correction value of each primary operating parameter, the primary operating parameter that described participation boiler efficiency calculates comprises:

Environment temperature, i.e. dry-bulb temperature;

Wet-bulb temperature;

Economizer input gas temperature;

Economizer exit flue-gas temperature;

Air preheater inlet air temperature;

Air preheater input gas temperature;

Exhaust gas temperature;

End slag temperature;

Flue dust temperature;

Enter stove fuel temperature;

Coal pulverizer outlet air temperature;

Air preheater fume side outlet oxygen amount;

Air preheater fume side import oxygen amount;

Unburned carbon in flue dust;

Carbon content in the bottom ash;

4) carry out boiler efficiency performance test according to the boiler performance test code of ASMEPTC4, this step and step 2) described in Turbine Performance Test carry out simultaneously, this step is specific as follows:

A) obtain coal sample according to the sampling method in described boiler performance test code, high-order calorific capacity and ultimate analysis are carried out to it;

B) the effective quantity of heat given up Q of boiler is calculated according to the following formula _bO:

$Q_{BO}=\frac{Q_{TI}}{{\mathrm{\η}}_p}\×100$

In formula, Q _bOfor effective quantity of heat given up of boiler, unit kJ/h;

Q _tIfor the heat consumption of Turbine Performance Test, i.e. steam turbine input heat, unit kJ/h;

η _pfor pipeline efficiency, unit %, for capacity 300MW and above unit, gets 99.5%;

C) according to the boiler efficiency computing method in ASMEPTC4, final boiler fired coal amount B is calculated _t;

$B_T=\frac{Q_{BO}}{{\mathrm{\η}}_{BT}\×HHV}\×100$

In formula, B _tfor testing the boiler fired coal amount obtained, units/kg/h;

η _bTfor the boiler efficiency that experiment calculation obtains, unit %;

HHV is steps A) in the high-order calorific capacity that obtains, unit kJ/kg;

D) according to testing the final boiler fired coal amount B obtained _tand the Coal-fired capacity B shown in on-the-spot DCS _dCS, calculate the correction coefficient K of Coal-fired capacity _bF.

$K_{BF}=\frac{B_T}{B_{DCS}};$

In formula, K _bFfor the correction coefficient of Coal-fired capacity; B _tfor the calculated value of the amount of boiler fired coal accurately according to the acquisition of ASME boiler test standard; B _dCSfor the Coal-fired capacity of DCS display.Before boiler carries out formal ASME efficiency test, should first calibrate Coal-fired capacity measurement mechanism such as the belt type weighing formula feeder of DCS display;

(2) the normal operational factor of unit is adopted to carry out the calculating of unit coal-burning calorific capacity and coa consumption rate index;

1) steamer pusher side participates in the correcting process of each primary operating parameter that heat consumption calculates:

In normally running according to unit, steamer pusher side participates in each primary operating parameter that heat consumption calculates, in integrating step (1) the 1st) each parameter error modified value that step obtains, calculate the revised numerical value of each primary operating parameter; The primary operating parameter that described participation heat consumption calculates is with in step (1) the 1st) listed by step, parameter is identical;

2) thermal loss of steam turbine amount Q in normal operation _tI' calculating:

With final feedwater flow for benchmark, calculate normal operating thermal loss of steam turbine amount Q _tI'; Heat consumption adopts the final feedwater flow F of the correction through calibration in calculating _fw'; Thermal loss of steam turbine amount Q _tI' calculating carry out according to the formula provided in Turbine Performance Test standard.

Through the final feedwater flow F of the correction of calibration _fw' adopt following formula to calculate:

F _fw’＝K _fwf×F _fwDCS

In formula, F _fw' be the final feedwater flow of correction through calibration; K _fwffor in step (1) the 2nd) correction coefficient of final feedwater flow that obtains of step; F _fwDCSfor the final feedwater flow value of DCS display;

3) boiler side participates in the correcting process of each primary operating parameter that boiler efficiency calculates:

In normally running according to unit, boiler side participates in each primary operating parameter that boiler efficiency calculates, in integrating step (1) 3) each parameter error modified value that step obtains, calculate the revised numerical value of each primary operating parameter of boiler side; Participating in primary operating parameter that boiler efficiency calculates with in step (1) 3) listed by step, parameter is identical;

4) unit normally run in the calculating of coal burning caloricity HHV ':

A) the normal operating quantity of heat given up Q of boiler _bO' be calculated as follows:

${Q_{BO}}^{,}=\frac{{Q_{TI}}^{,}}{{\mathrm{\η}}_p}\×100;$

In formula, Q _bO' be the normal operating quantity of heat given up of boiler, unit kJ/h; Q _tI' be the heat consumption of steam turbine in normal operation, i.e. steam turbine input heat, unit kJ/h; η _pfor pipeline efficiency, unit %, for capacity 300MW and above unit, gets 99.5%;

B) the Coal-fired capacity B that boiler is revised in normally running _t' be calculated as follows:

B _T’＝K _BF×B _DCS’

In formula, B _t' be revised Coal-fired capacity accurately in normal operation; K _bFfor in step (1) 4) the boiler fired coal quantity correction coefficient that obtains in step; B _dCS' be the Coal-fired capacity that in normal operation, DCS shows;

C) coal elements analysis data when boiler up-time efficiency calculates directly adopt coal qualities test Elemental analysis data during performance test, or adopt the coal qualities test Elemental analysis data regularly carried out;

D) unburned carbon in flue dust when boiler up-time efficiency calculates and carbon content in the bottom ash data, as on-the-spot without on-line measurement device time, then directly adopt boiler efficiency performance test time unburned carbon in flue dust and carbon content in the bottom ash data, or adopt periodic analysis obtain unburned carbon in flue dust and ash content carbon data;

When E) calculating coal-fired calorific capacity in normal operation, according to following steps:

A. the high-order calorific capacity HHV of a certain fire coal is supposed _tRY, carry out boiler efficiency iterative computation according to the method for ASMEPTC4 boiler efficiency standard; Comprise according to data: the normal operating quantity of heat given up Q of boiler _bO', the revised numerical value of each primary operating parameter of boiler side, aforementioned in the coal elements that provides analyze data and unburned carbon in flue dust and carbon content in the bottom ash data;

B. according to the boiler up-time efficiency that iteration obtains, the boiler fired coal amount B obtained according to the high-order calorific capacity of the fire coal supposed is calculated _tRY;

$B_{TRY}=\frac{{Q_{BO}}^{,}}{{\mathrm{\η}}_{BTRY}\×{\mathrm{HHV}}_{TRY}}\×100$

In formula, B _tRYfor the boiler fired coal amount obtained according to the coal-fired high-order calorific capacity of hypothesis, units/kg/h;

η _bTRYfor the boiler efficiency obtained according to the coal-fired high-order calorific capacity of hypothesis, unit %;

HHV _tRYthe high-order calorific capacity of fire coal for hypothesis, unit kJ/kg;

C. boiler fired coal amount B is compared _tRYrevised Coal-fired capacity B in normally running with boiler _t', as Δ B=|B _tRY-B _t' |≤0.1, then calculate end, normal operating fire coal high-order calorific capacity the HHV '=HHV of boiler _tRY; Otherwise return step a., again suppose HHV _tRYcalculate;

5) unit normally run in coa consumption rate index b _f' calculating

On the basis calculating coal-fired high-order calorific capacity HHV ' in normal operation, calculate gross coal consumption rate index b in normal operation by following formula _f':

${b_f}^{,}=\frac{{B_T}^{,}\×{\mathrm{HHV}}^{,}}{P_G\×{\mathrm{HHV}}_{STD}}\×1000$

In formula, b _f' be unit coa consumption rate index in normal operation, unit g/kW.h;

P _gfor unit generation power, unit kW;

HHV _sTDfor the high-order calorific capacity of the fire coal calculated based on the standard coal equivalent low heat value of national Specification, be constant, unit kJ/kg.