CN112418527A - Optimal coal blending ratio calculation and judgment method based on boiler side index and fuel price - Google Patents

Optimal coal blending ratio calculation and judgment method based on boiler side index and fuel price Download PDF

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CN112418527A
CN112418527A CN202011325947.1A CN202011325947A CN112418527A CN 112418527 A CN112418527 A CN 112418527A CN 202011325947 A CN202011325947 A CN 202011325947A CN 112418527 A CN112418527 A CN 112418527A
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CN112418527B (en
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王智微
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Xian Thermal Power Research Institute Co Ltd
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    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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Abstract

The invention discloses an optimal coal blending proportion calculation and judgment method based on boiler side indexes and fuel prices, which considers the actual influence of coal blending on the operation of a coal fired unit, simplifies a simple analysis method and a simple formula for a target value of the coal blending proportion by using a calculation formula of power supply coal consumption, relates the target value of the optimal coal blending proportion to the boiler efficiency, the plant power rate of equipment at the boiler side and the fuel prices, provides a specific calculation method for the target value of the coal blending proportion, and obtains a specific implementation method of the coal blending proportion based on the lowest cost target of the coal fired unit.

Description

Optimal coal blending ratio calculation and judgment method based on boiler side index and fuel price
Technical Field
The invention relates to the technical field of thermal power generation in the energy and power industry, in particular to a method for calculating and judging the optimal coal blending ratio based on boiler side indexes and fuel price.
Background
The change of coal types in the coal-fired unit inevitably brings the change of the whole efficiency of the unit, meanwhile, the change of fuel price inevitably brings the change of power generation cost, the optimal coal blending proportion of different coal types is determined according to the actual situation of a boiler, and the lowest cost of the coal-fired unit is expected to be achieved under the boundary conditions of safety, environmental protection and the like.
The traditional method for determining the optimal coal blending ratio is generally determined through experiments. The test method comprises the steps of measuring related parameters to calculate the boiler efficiency of the unit through the co-combustion ratio of different coals under a certain stable load condition, and determining the optimal coal blending ratio according to the maximum target value of the boiler efficiency. The test methods only consider the influence of the boiler efficiency, but do not consider the change of the plant power rate of the boiler equipment caused by different blending combustion ratios, and the optimal blending combustion ratio of the coal cannot be objectively evaluated.
And the lowest power supply coal consumption is taken as a target value, the efficiency of the steam turbine needs to be considered, so that the determination of the optimal coal blending proportion is complex, and the analysis result of the optimal coal blending proportion is influenced by the efficiency of the steam turbine, the heat supply of a unit and other factors.
Meanwhile, due to the difference of fuel prices, the blending proportion with the lowest coal consumption is not the optimal blending proportion with the lowest cost, and the change of the fuel prices brings the corresponding change of the optimal blending proportion.
Therefore, a simple and accurate calculation method is needed to determine the optimal blending ratio of the coal.
Disclosure of Invention
In order to solve the technical problem that the determination of the optimal coal blending proportion is more objective or simple at present, the invention aims to provide a method for calculating and judging the optimal coal blending proportion based on boiler side indexes and fuel prices.
In order to achieve the purpose, the technical scheme adopted by the invention and the beneficial effects of the invention are as follows:
a method for calculating and judging the optimal coal blending proportion based on boiler side indexes and fuel prices comprises the following steps;
step 1:
preparing a test according to related standards (GB 10184 power station boiler performance test regulation), selecting a coal-fired unit, and mixing and burning two kinds of coal according to a coal blending ratio x under a certain load1Stable operation;
step 2:
measuring and recording the blending combustion ratio x of the blended coal1Calculating the boiler efficiency and the station service power rate of equipment at the boiler side according to the relevant parameters under the condition to obtain the coal blending combustion ratio x1Performance target value OPT of coal blending combustion ratio under conditioncoal,1And cost target value OPTmix,1Obtaining a set of corresponding relations (x) between the cost target value of the blending ratio and the blending ratio1，OPTmin,1)；
And step 3:
other conditions are not changed, and only the blending ratio x of the blended coal is changed1Is x2Repeating the steps 1 and 2 to obtain the cost target value of more than N groups of coal blending proportion and the corresponding data (x) of the coal blending proportion1，OPTmix,1)，…，(xN，OPTmix,N)，N≥3；xNThe blending ratio of the coal blending for the Nth time;
and 4, step 4:
according to the cost target value OPT of each blending coal blending ratio and blending coal blending ratiomixCorresponding to the data, obtaining OPT by least square method, function fitting, etcmixAnd the functional relation with the coal blending combustion ratio x is as follows:
OPTmix＝f(x)
then OPT of the above formulamixThe coal blending proportion x corresponding to the minimum value is the optimal coal blending proportion;
and 5:
and (3) for the blending coal blending ratio under other load conditions, the optimal blending coal blending ratio under any other load conditions of the coal-fired unit can be obtained by only adjusting the load of the coal-fired unit and repeating the steps 1-4.
The blending ratio x of the coal blending in the step 21Performance target value OPT under conditionscoal,1The calculation formula of (a) is as follows:
OPTcoal,1＝ηgl,1(1-ηcyd,gl,1)
in the formula, OPTcoal,1-blending ratio x of coal blending and burning1Performance target value under the conditions, -;
ηgl,1-blending ratio x of coal blending and burning1Boiler efficiency under conditions, -;
ηcyd,gl,1-blending ratio x of coal blending and burning1Plant power rate of the equipment on the boiler side under the condition.
The boiler efficiency can be calculated according to GB 10184 power station boiler performance test regulations, main power consumption equipment of boiler side equipment is a coal mill, a coal feeder, a blower, an induced draft fan and the like, and the ratio of the sum of the power of the equipment to the generating power of a unit is the station service power rate of the boiler side equipment.
Simultaneously calculating the blending ratio x of coal blending and burning1Coal blending price under conditions Pmix,1The following were used:
Figure BDA0002794279050000041
in the formula, Pmix,1-blending ratio x of coal blending and burning1Coal blending price under the condition, meta/t standard coal;
Pithe price of the standard coal of the ith mixed coal is Yuan/t standard coal;
Bcp,i,1-blending ratio x of coal blending and burning1The blending amount of the i-th blended coal under the condition is ton;
Qi,ar,dw-the received base calorific value of the i-th blended coal, kJ/kg;
the blending ratio x of the blended coal can be calculated1The cost target value of the blending ratio of the coal under the condition is as follows:
Figure BDA0002794279050000042
the invention has the beneficial effects that:
the invention considers the actual influence of the blending coal combustion on the operation of the coal-fired unit, and simplifies the simple analysis method and the formula of the target value of the blending coal combustion ratio by using the calculation formula of the power supply coal consumption, so that the evaluation of the optimal blending coal combustion ratio is more accurate and objective. By the method, the traditional method for evaluating the optimal coal blending proportion is complete and simple and is suitable for use, and the analysis result of the optimal coal blending proportion truly reflects the influence on the composition cost of the coal-fired machine.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example (b):
a specific derivation process of the optimal coal blending ratio calculation and judgment method based on boiler side indexes and fuel prices is introduced as follows.
The lowest power supply cost of the coal-fired unit is the cost target value of the coal blending combustion proportion, and the basic formula is as follows:
OPTmix＝Pmixbgd×10-6
in the formula, OPTmix-a cost target value of coal blending combustion ratio, yuan/kWh;
Pmix-coal blending price, yuan/t (standard coal);
bgd-unit power supply coal consumption, g (standard coal)/kWh.
The calculation formula of the coal blending price is as follows:
Figure BDA0002794279050000051
in the formula, PmixThe price of the blended coal for blending and burning the blended coal is Yuan/t standard coal;
Pithe price of the standard coal of the ith mixed coal is Yuan/t standard coal;
Bcp,ithe blending amount of the ith blending coal is ton;
Qi,ar,dw-the received base calorific value of the i th blended coal, kJ/kg.
The calculation formula of the coal consumption of the coal-fired unit for supplying power is as follows:
Figure BDA0002794279050000052
in the formula, bgd-unit power supply coal consumption, g (standard coal)/kWh;
HR-turbine heat loss, kJ/kWh;
ηgl-boiler efficiency, -;
ηcyd-plantPower consumption, -;
ηgd-pipe efficiency, -;
ηdj-unit generator efficiency, -a.
Because only the influence of the blending ratio on the boiler efficiency and the plant power consumption of equipment on the boiler side is considered, the calculation formula of the unit coal consumption target value of the blending ratio is simplified as follows:
OPTcoal＝ηgl(1-ηcyd，gl-ηcyd，qt)
in the formula, OPTcoal-a performance target value for the coal blending firing ratio, -;
ηcyd，gl-the plant power rate of the boiler side equipment-;
ηcyd，qt-plant power consumption of equipment other than the boiler-;
the plant power consumption rate of the unit is 0.03-0.05, the plant power consumption rate of the boiler side equipment is 0.02-0.04, and the following can be assumed:
1-ηcyd，qt≈1
target value OPT of performance of coal blending combustion ratiocoalCan be further simplified into:
OPTcoal＝ηgl(1-ηcyd，g1)
thus, the cost target value of the blending ratio of the coal is simplified as follows:
Figure BDA0002794279050000061
namely OPTmixThe minimum value is the optimal blending ratio of the coal.
The specific implementation steps are as follows;
step 1:
preparing a test according to related standards (GB 10184 power station boiler performance test regulation), selecting a coal-fired unit, and mixing and burning two kinds of coal according to a coal blending ratio x under a certain load1Stable operation;
step 2:
measuring and recording the blending combustion ratio x of the blended coal1Calculating the boiler efficiency and the station service power rate of equipment at the boiler side according to the relevant parameters under the condition to obtain the coal blending combustion ratio x1Performance target value OPT of coal blending combustion ratio under conditioncoal，1And cost target value OPTmix，1Obtaining a set of corresponding relations (x) between the cost target value of the blending ratio and the blending ratio1，OPTmix，1)。
Blending ratio x of coal and combustion1Performance target value OPT under conditionscoal，1The calculation formula of (a) is as follows:
OPTcoal，1＝ηgl，1(1-ηcyd，gl，1)
in the formula, OPTcoal，1-blending ratio x of coal blending and burning1Performance target value under the conditions, -;
ηgl，1-blending ratio x of coal blending and burning1Boiler efficiency under conditions, -;
ηcyd，gl，1-blending ratio x of coal blending and burning1Plant power rate of the equipment on the boiler side under the condition.
The boiler efficiency can be calculated according to GB 10184 power station boiler performance test regulations, main power consumption equipment of boiler side equipment is a coal mill, a coal feeder, a blower, an induced draft fan and the like, and the ratio of the sum of the power of the equipment to the generating power of a unit is the station service power rate of the boiler side equipment.
Simultaneously calculating the blending ratio x of coal blending and burning1Coal blending price under conditions Pmix，1The following were used:
Figure BDA0002794279050000071
in the formula, Pmix，1-blending ratio x of coal blending and burning1Coal blending price under the condition, meta/t standard coal;
Pithe price of the standard coal of the ith mixed coal is Yuan/t standard coal;
Bcp，i，1-blending ratio x of coal blending and burning1The blending amount of the i-th blended coal under the condition is ton;
Qi，ar，dw-the received base calorific value of the i th blended coal, kJ/kg.
The blending ratio x of the blended coal can be calculated1The cost target value of the blending ratio of the coal under the condition is as follows:
Figure BDA0002794279050000081
and step 3:
other conditions are not changed, and only the blending ratio x of the blended coal is changed1Is x2Repeating the steps 1 and 2 to obtain the cost target value of more than N groups of coal blending proportion and the corresponding data (x) of the coal blending proportion1，OPTmix，1)，...，(xN，OPTmix，N)，N≥3；xNThe blending ratio of the coal blending for the Nth time.
And 4, step 4:
according to the cost target value OPT of each blending coal blending ratio and blending coal blending ratiomixCorresponding to the data, obtaining OPT by least square method, function fitting, etcmixAnd the functional relation with the coal blending combustion ratio x is as follows:
OPTmix＝f(x)
then OPT of the above formulamixAnd the coal blending proportion x corresponding to the minimum value is the optimal coal blending proportion.
And 5:
and (3) for the blending coal blending ratio under other load conditions, the optimal blending coal blending ratio under any other load conditions of the coal-fired unit can be obtained by only adjusting the load of the coal-fired unit and repeating the steps 1-4.

Claims (2)

1. A method for calculating and judging the optimal coal blending proportion based on boiler side indexes and fuel prices is characterized by comprising the following steps;
step 1:
preparing a test according to related standards (GB 10184 power station boiler performance test regulation), selecting a coal-fired unit, and mixing and burning two kinds of coal according to a coal blending ratio x under a certain load1Stable fortuneA row;
step 2:
measuring and recording the blending combustion ratio x of the blended coal1Calculating the boiler efficiency and the station service power rate of equipment at the boiler side according to the relevant parameters under the condition to obtain the coal blending combustion ratio x1Performance target value OPT of coal blending combustion ratio under conditioncoal，1And cost target value OPTmix，1Obtaining a set of corresponding relations (x) between the cost target value of the blending ratio and the blending ratio1，OPTmix，1)；
And step 3:
other conditions are not changed, and only the blending ratio x of the blended coal is changed1Is x2Repeating the steps 1 and 2 to obtain the cost target value of more than N groups of coal blending proportion and the corresponding data (x) of the coal blending proportion1，OPTmix，1)，...，(xN，OPTmix，N)，N≥3；xNThe blending ratio of the coal blending for the Nth time;
and 4, step 4:
according to the cost target value OPT of each blending coal blending ratio and blending coal blending ratiomixCorresponding to the data, obtaining OPT by least square method, function fitting, etcmixAnd the functional relation with the coal blending combustion ratio x is as follows:
OPTmix＝f(x)
then OPT of the above formulamixThe coal blending proportion x corresponding to the minimum value is the optimal coal blending proportion;
and 5:
and (3) for the blending coal blending ratio under other load conditions, the optimal blending coal blending ratio under any other load conditions of the coal-fired unit can be obtained by only adjusting the load of the coal-fired unit and repeating the steps 1-4.
2. The method for calculating and judging the optimal coal blending ratio based on the boiler side index and the fuel price as claimed in claim 1, wherein the coal blending ratio x in the step 21Performance target value OPT under conditionscoal，1The calculation formula of (a) is as follows:
OPTcoal，1＝ηgl，1(1-ηcyd，gl，1)
in the formula, OPTcoal，1-blending ratio x of coal blending and burning1Performance target value under the conditions, -;
ηgl，1-blending ratio x of coal blending and burning1Boiler efficiency under conditions, -;
ηcyd，gl，1-blending ratio x of coal blending and burning1Plant power rate of the equipment on the boiler side under the condition.
The boiler efficiency can be calculated according to GB 10184 power station boiler performance test regulations, main power consumption equipment of boiler side equipment is a coal mill, a coal feeder, a blower, an induced draft fan and the like, and the ratio of the sum of the power of the equipment to the generating power of a unit is the station service power rate of the boiler side equipment.
Simultaneously calculating the blending ratio x of coal blending and burning1Coal blending price under conditions Pmix，1The following were used:
Figure FDA0002794279040000021
in the formula, Pmix，1-blending ratio x of coal blending and burning1Coal blending price under the condition, meta/t standard coal;
Pithe price of the standard coal of the ith mixed coal is Yuan/t standard coal;
Bcp，i，1-blending ratio x of coal blending and burning1The blending amount of the i-th blended coal under the condition is ton;
Qi，ar，dw-the received base calorific value of the i-th blended coal, kJ/kg;
the blending ratio x of the blended coal can be calculated1The cost target value of the blending ratio of the coal under the condition is as follows:
Figure FDA0002794279040000031
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