CN111612308B - General calculation method for evaluating coal consumption index of coal-fired heat supply unit - Google Patents
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Abstract
The invention discloses a general calculation method for evaluating coal consumption indexes of a coal-fired heat supply unit, and relates to the technical field of energy and power production; the method comprises the steps of S1, calculating the thermalization power generation rate of a heat supply unit, S2, calculating the power generation heat consumption of the heat supply unit, S3, calculating the power generation efficiency of the heat supply unit and S4, calculating the power generation coal consumption of the heat supply unit; the coal consumption of the coal-fired heat supply unit is evaluated by the steps of calculating the thermalization power generation rate of the heat supply unit by S1, calculating the power generation heat consumption of the heat supply unit by S2, calculating the power generation efficiency of the heat supply unit by S3, calculating the power generation coal consumption of the heat supply unit by S4 and the like.
Description
Technical Field
The invention relates to the technical field of energy and power production, in particular to a general calculation method for evaluating coal consumption indexes of a coal-fired heat supply unit.
Background
At present, more than half of coal is used for producing electric power in China, the huge consumption of the coal brings serious environmental pressure, in the process of electric power production, the coal consumption index of a thermal power unit is a comprehensive index which represents the technical perfection degree of the energy conversion process of a power plant, and is a quantity index and a quality index, the algorithm is simple, but for a heat supply unit, partial steam which does work in a steam turbine is used for supplying heat to the outside, the quality of two products of heat and power is different, the heat supply quality caused by different heat supply parameters is also different, and the technical perfection degree of the cogeneration production process needs to be comprehensively evaluated urgently found, so that the comparison between a heat supply unit and a heat power plant is facilitated, the comparison between a condensing power plant and the heat power plant is facilitated, and the calculation method is simple and clear. The index can be used for reasonably evaluating the technology, management and operation level of the existing coal-fired power plant, can also be used for guiding the technical parameter selection and equipment type selection of a newly-built unit, promotes the power plant to actively adopt a new energy-saving technology, and greatly improves the heat efficiency of the unit.
Conventionally, in order to calculate various economic indexes of a coal-fired power plant, a calculation method of technical and economic indexes of a thermal power plant (DL/T904-2015) is specially established in the power industry, and a calculation method of various technical and economic indexes of the thermal power plant is provided. The efficiency index eta for evaluating the coal-fired efficiency of the thermal power plant in the standard is established based on the first law of thermodynamics, is a quantity index and a quality index for a straight condensing type generator set, can reflect the fuel utilization rate of the thermal power plant and the energy conversion efficiency of the generator set, is a comprehensive index, and for a heat supply unit, the calculation result is the ratio of the total energy of two products of heat and electricity to the input energy of the coal-fired, the high-grade electric energy is converted into 3600W according to the heat unit and then is added with the low-grade heat supply, the grade difference of the two energy products of heat and electricity cannot be distinguished, and the calculation formula is as follows:
in the formula, W represents the generated energy of the heat supply unit, kWh;
q-heat supply unit heat supply amount, kJ/h;
b-coal consumption of the heat supply unit, kg/h.
The calculation results have three problems:
1. the coal consumption of the same type of units has larger difference under the condition of different heating steam parameters and the same heating load.
2. The same type of unit supplies, and the hot steam parameters are the same, and the coal consumption under different heat supply load is also very different.
3. Even though the most advanced supercritical unit, the coal consumption cannot be compared with the small back pressure unit.
Besides causing unfairness in the evaluation process, the method also has certain influence on the energy efficiency evaluation of a new project of the thermal power generating unit.
The heat method fully returns the energy-saving and heat-saving economic benefits of cogeneration to the aspect of power generation, so that heat users require high heat supply parameters, the assumption of high heat supply cost is caused, and national energy is wasted. The actual enthalpy drop method fully returns the heat economic benefit of cogeneration to heat supply, and although the difference in the quality of heat supply steam is considered, the heat supply is not equal to work; the researchers propose that the heat loss of the cold source of the thermalization power generation should be shared according to the quality, and the actual enthalpy drop method is corrected. The inventor thinks that the fire is not used, does not consider the action of the fire in heat supply, and the result is favorable for heat supply and is not beneficial to power generation, and is not suitable, and thinks that the fire is not used, either the whole action (in the case of heat method) or the complete non-action (in the case of fire method), so the combined heat and power method is provided. The distribution of Qtp is considered by scholars, so that the heating benefit is improved from the hot end, the cold end (including the grade of heating, the connection mode of a heat user and a heat supply network, heat exchange equipment for heat application and the like) is fully considered, a sharing method for unit consumption of co-production heating is provided, and the artificial regulation is reduced to the minimum limit as much as possible. Many of these documents are not listed, and it can be seen that theoretically discussing the rational distribution of Qtp is still one of the theoretical problems to be solved urgently in developing the heat industry.
Therefore, a new coal index or efficiency calculation method needs to be established for the heat supply unit, the power supply coal consumption of the cogeneration unit is converted into the power supply coal consumption in a corresponding pure condensation state through the method, and the influence of the heat supply amount and the steam extraction parameter of the cogeneration unit on the power supply coal consumption of the unit can be effectively eliminated.
The middle-power-grid-connection science and technology [ 2014 ] 219 & ltnational fire coal unit competition evaluation management method (2014 edition) stipulates that the national fire coal large unit competition evaluation technical scheme is a calculation and correction method aiming at power supply coal consumption of different types of units:
power supply coal consumption = annual standard coal quantity/power supply quantity-72 industrial extraction steam pressure correction coefficient industrial thermoelectric ratio-82.8 heating extraction steam pressure correction coefficient heating thermoelectric ratio
And S4 and S5 are respectively industrial heat supply and heating heat supply steam extraction pressure correction coefficients.
The method is simple and easy to implement in practice, has strong operability and certain theoretical support, but the source of the correction coefficient of the industrial steam extraction and heating steam extraction is lack of reliable theoretical demonstration.
Problems with the prior art and considerations:
how to solve the technical problem of evaluating coal consumption of a coal-fired heat supply unit.
Disclosure of Invention
The invention aims to solve the technical problem of providing a general calculation method for evaluating coal consumption indexes of a coal-fired heat supply unit, which realizes the evaluation of the coal consumption of the coal-fired heat supply unit through the steps of calculating the thermalization power generation rate of the heat supply unit by S1, calculating the power generation heat consumption of the heat supply unit by S2, calculating the power generation efficiency of the heat supply unit by S3, calculating the power generation coal consumption of the heat supply unit by S4 and the like.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a general calculation method for evaluating coal consumption index of a coal-fired heat supply unit comprises the steps of S1 calculating thermalization power generation rate of the heat supply unit, S2 calculating power generation heat consumption of the heat supply unit, S3 calculating power generation efficiency of the heat supply unit and S4 calculating power generation coal consumption of the heat supply unit, in the step of calculating power generation heat consumption of the heat supply unit in S2,
in formula 4: q. q of tp -heat consumption for power generation, kJ/kWh; q tp -unit heat consumption, GJ/h; pe-actual output electric power of the unit, kW; w is a group of h -unit thermalization equivalent power, kW.
The further technical scheme is as follows: in the step of calculating the thermalization power generation rate of the heating unit in S1,
in formula 1: omega-thermalization Generation, kWh/GJ; h is o -new steam enthalpy, kJ/kg; h is h -enthalpy of heat extraction, kJ/kg; h' h-specific enthalpy of return heat supply water, kJ/kg; eta m η g -generator mechanical efficiency,%; e-relative thermalization power generation fraction (%).
The further technical scheme is as follows: where e in formula 1 is the ratio of internal to external thermalization generation,
in formula 2:
-internal thermalization power generation, kW;
-external thermalization power generation, kW; d im The regenerative steam extraction amount is assumed to be kg/h; d h.t -the amount of heat supply extraction, kg/h; h is im -specific enthalpy of heating steam, kJ/kg, for the hypothetical hybrid heater; h' im -hypothetical hybrid heater steam condensate enthalpy, kJ/k; h is fw -enthalpy of feed water, kJ/kg;
-return water enthalpy, kJ/kg.
The further technical scheme is as follows:
W h ＝Q h ω (3)
in formula 3: w h -thermalization equivalent power, kW; q h -heat supply, GJ/h.
The further technical scheme is as follows: in the step of calculating the generating efficiency of the heating unit S3,
in formula 5: eta tp -generating thermal efficiency,%.
The further technical scheme is as follows: in the step of S4 calculating the coal consumption of the heat supply unit,
in formula 6: b tp -electricity generation coal consumption, g/kWh.
The further technical scheme is as follows: and manually executing the steps of S1 calculating the thermalization power generation rate of the heat supply unit, S2 calculating the power generation heat consumption of the heat supply unit, S3 calculating the power generation efficiency of the heat supply unit and S4 calculating the power generation coal consumption of the heat supply unit.
The further technical scheme is as follows: and operating the computer to calculate the thermalization power generation rate of the heat supply unit by S1, calculating the power generation heat consumption of the heat supply unit by S2, calculating the power generation efficiency of the heat supply unit by S3 and calculating the power generation coal consumption of the heat supply unit by S4.
The further technical scheme is as follows: and displaying the calculation result through a display connected with the computer.
The further technical scheme is as follows: the calculation result is printed by a printer connected to the computer.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the coal consumption of the coal-fired heat supply unit is evaluated by the steps of calculating the thermalization power generation rate of the heat supply unit S1, calculating the power generation heat consumption of the heat supply unit S2, calculating the power generation efficiency of the heat supply unit S3, calculating the power generation coal consumption of the heat supply unit S4 and the like.
See detailed description of the preferred embodiments.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic block diagram of a steam extraction and heat supply generator set;
FIG. 3 is a schematic block diagram of a backpressure heating power generation unit;
fig. 4 is a T-S diagram of the rankine cycle and the heating cycle.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited to the specific embodiments disclosed below.
As shown in fig. 1, the invention discloses a general calculation method for evaluating coal consumption indexes of a coal-fired heat supply unit, which comprises the following specific steps:
s1, calculating the thermalization power generation rate of the heat supply unit
In formula 1:
omega-thermalization Generation, kWh/GJ;
h o -new steam enthalpy, kJ/kg;
h h ——enthalpy of heat supply extraction, kJ/kg;
h' h -specific enthalpy of return heat supply, kJ/kg;
η m η g -generator mechanical efficiency,%;
e-relative thermalization power generation fraction (%).
Where e is the ratio of internal to external thermalization generation.
In formula 2:
D im the regenerative steam extraction amount is assumed to be kg/h;
D h.t -the amount of heat supply extraction, kg/h;
h im -specific enthalpy of heating steam, kJ/kg, for the hypothetical hybrid heater;
h' im -hypothetical hybrid heater steam condensate enthalpy, kJ/k;
h fw -feed water enthalpy, kJ/kg;
W h ＝Q h ω (3)
In formula 3:
W h -thermalization equivalent power, kW;
Q h -heat supply, GJ/h.
S2, calculating the power generation heat consumption of the heat supply unit
In formula 4:
q tp -power generation heat consumption, kJ/kWh;
Q tp -unit heat consumption, GJ/h;
pe-actual output electric power of the unit, kW;
W h -unit thermalization equivalent power, kW.
S3, calculating the power generation efficiency of the heat supply unit
In formula 5:
η tp -generating thermal efficiency,%.
S4, calculating the power generation coal consumption of the heat supply unit
In formula 6:
b tp -electricity generation coal consumption, g/kWh.
The purpose of this application is:
the new coal-fired calculation correction method has both quantity concepts and quality concepts, can comprehensively reflect the technical perfection degree of the energy conversion process of different types of coal-fired steam turbine units, can compare the technical economy of the straight condensing generator set and the heat supply unit by utilizing the index, can accurately evaluate the technical economy of different heat supply units, is convenient for industry standard and index competition and the like, and is simple and convenient and strong in practicability.
The invention concept of the application is as follows:
the essence of the thermal power plant is energy conversion, i.e. chemical energy in the fuel is converted into heat energy of steam by combustion in a boiler, and is converted into mechanical energy by the rotation of a steam turbine, and finally is converted into required electric energy by a generator. The thermal power plant in China adopts a heat method to quantitatively evaluate the heat economy, and the commonly used heat economy indexes mainly comprise energy consumption measured in each hour and each year, including steam consumption, heat consumption and coal consumption; energy consumption rates measured per kW · h or MW · h, including steam consumption rate, heat consumption rate and coal consumption rate; thermal efficiency, measured in percent, is measured for a turbo-generator set or for the entire power plant.
The standard coal consumption rate is a technical perfection degree reflecting the energy conversion process of a power plant or a generating set, is a comprehensive index reflecting the management level and the operation level of the power plant or the generating set, and is one of important indexes for assessment of inter-plant economic evaluation and inter-team economic evaluation, national large-unit competition in the power industry and the like.
As shown in fig. 2 and 3, there are two production forms of thermal power plants: the method is characterized in that a condensing steam type power plant generates electricity to supply power to the outside, and industrial boilers or heating hot water boilers or even civil stoves produce heat energy to supply heat to heat users, and is also called single energy production, namely, only one type of energy, electric energy or heat energy is supplied. The combined heat and power generation is called as combined heat and power generation or thermalization for short, and converts chemical energy of fuel into high-grade heat energy for power generation, and simultaneously uses the low-grade heat energy which is generated by partial work in a heat supply steam turbine or is generated by thermalization for external heat supply.
As shown in FIG. 4, which is a thermodynamic cycle enthalpy-entropy diagram of a straight condensing power generation unit and a heating power generation unit, the left (a) is a Rankine cycle, and the left (b) is a heating cycle, it can be seen that eta of the heating cycle is th And η ih Are all 1 because not only the ideal exhaust heat q ha And the irreversible heat loss delta qh of the steam work is completely used for supplying heat to the outside, and the heat loss of a cold source like Rankine cycle is completely avoided, so that the heat economy of the thermal power plant can be greatly improved, and the heat consumption rate and the coal consumption rate are correspondingly greatly reduced. The calculation shows that the heat supply unit eta calculated according to the heat method tp (e) The value is far higher than the Rankine cycle thermal efficiency under the same parameter.
The heat supply type steam turbine has different forms such as a single-extraction C type or double-extraction CC type condensing steam turbine, a back pressure type B type or extraction back type CB type and the like. It is emphasized that, in the steam extraction mode, only the heating steam Dh for generating electricity and then supplying heat belongs to cogeneration, and the condensing steam Dc thereof still belongs to separate generation of electricity. The definition of the european union for cogeneration is: from a kinetic point of view, cogeneration is the sequential production of two or more forms of energy from a primary energy system.
According to the traditional definition, the economic efficiency of the heat supply unit and the thermal power plant needs to be evaluated by adopting a series of comprehensive indexes, including a fuel utilization coefficient, a thermalization power generation rate, a thermoelectric ratio, power generation coal consumption, power supply coal consumption, heat supply coal consumption and the like, wherein the standard coal consumption is only a quantity index, and the required coal consumption index is a comprehensive index which represents the technical perfection degree of the energy conversion process of the power plant, namely the quantity index and the quality index.
The heat consumption of the generator set is basically defined as follows:
in the formula:
q-Power Heat consumption, kJ/kWh;
q is the heat consumption of the unit, GJ/h;
p is the output electric power of the unit, kW.
In the heat consumption rate of the heat supply unit calculated by the heat method, because the heat supply amount is subtracted from the heat consumption of the whole unit and is replaced by the sum of pure condensing steam flow and heat supply steam flow energy without cold source loss, the benefits of cogeneration are totally attributed to power generation.
The method is characterized in that the equivalent coal consumption of the heat supply unit is calculated by utilizing the heat supply steam flow according to the perfection degree of the unit and the power generation capacity of thermodynamic cycle, namely the equivalent heating power.
The equivalent coal consumption index considers the influence of different heat supply parameter qualities and work capacity on the coal consumption on the basis of the second law of thermodynamics.
The index can be used for reasonably evaluating the technology, management and operation level of the existing power plant, can also be used for guiding the technical parameter selection and equipment type selection of a newly-built unit, promotes the power plant to actively adopt a new energy-saving technology, and greatly improves the heat efficiency of the unit.
The technical contribution of the application is as follows:
a general calculation method for evaluating coal consumption indexes of a coal-fired heat supply unit specifically comprises the following steps:
1. firstly, calculating the thermalization power generation rate of a heat supply unit:
the thermalization power generation rate is the thermalization power generation amount per GJ, represents the technical perfection degree of cogeneration, is only related to heat and electricity of a cogeneration part, and calculates the thermalization equivalent power of a unit through the thermalization power generation rate, namely, the heat supply energy is converted into the realizable power generation amount.
In formula 1:
omega-thermalization Generation, kWh/GJ;
h o -new steam enthalpy, kJ/kg;
h h -enthalpy of heat extraction, kJ/kg;
h' h -specific enthalpy of return heat supply water, kJ/kg;
η m η g -generator mechanical efficiency,%;
e-relative thermalization power generation fraction (%).
Where e is the ratio of internal to external thermalization generation.
In formula 2:
D im the regenerative steam extraction amount is assumed to be kg/h;
D h.t -the amount of heat supply extraction, kg/h;
h im -specific enthalpy of heating steam, kJ/kg, for the hypothetical hybrid heater;
h' im -assuming steam condensate enthalpy, kJ/k, for the hybrid heater;
h fw -feed water enthalpy, kJ/kg;
W h ＝Q h ω (3)
In formula 3:
W h -thermalization equivalent power, kW;
Q h -heat supply, GJ/h.
2. And then calculating the power generation heat consumption of the heat supply unit:
in formula 4:
q tp -power generation heat consumption, kJ/kWh;
Q tp -unit heat consumption, GJ/h;
pe-actual output electric power of the unit, kW;
W h -unit thermalization equivalent power, kW.
3. And then calculating the generating efficiency of the heat supply unit:
in formula 5:
η tp -generating thermal efficiency,%.
4. And finally, calculating the power generation coal consumption of the heat supply unit:
in formula 6:
b tp -electricity generation coal consumption, g/kWh.
The concept of thermalization equivalent power is introduced into the calculation method, in the traditional calculation method, even if the parameters of heat supply steam of units of the same type are the same, the calculated coal consumption of power supply is greatly different due to different heat supply quantities, and the calculation result cannot really reflect the technical level and the management level of actual equipment of a power plant. Besides unfairness in the evaluation process, certain influence is also caused on the energy efficiency evaluation of a new project of the thermal power generating unit.
The actual generating power Pe of the unit is Pe + W h After replacement, because the thermalization power generation rate omega is the thermalization of each giga of coke based on the heating cycle, namely the cogeneration power generation, the calculation index shows the technical perfection degree of the cogeneration.
The traditional heat method totally integrates the benefits of cogeneration into the aspect of power generation, the actual enthalpy drop method totally integrates the benefits into the aspect of heat supply, although the work capacity method is between the two methods, the difference between the exhaust steam temperature of a heat supply turbine and the ambient temperature is smaller, the heat supply coal consumption obtained by calculation through the sequential method is close to the actual enthalpy drop method, most of the benefits of cogeneration are also integrated into heat supply, the power generation coal consumption rate of a heat supply unit is still higher than that of a power system for replacing a condensing steam unit, a heat distribution method cannot be accepted by a heat enterprise, the development of cogeneration utilities is not facilitated, the national energy conservation is not facilitated, and the ecological environment is improved.
Description of the technical solution:
by extracting parameters such as coal, electricity, steam, water and the like in the production process of a power generation enterprise or a generator set, the real-time coal consumption of a single device can be calculated, and year and month statistical analysis and calculation of the whole plant or the single device can be carried out to obtain an average power generation or power supply coal consumption value.
Calculation example 1:
a certain thermal power plant is provided with a C50-8.83/0.118 type single steam extraction heat supply type unit p o ＝8.83MPa，t o ＝535℃，h o ＝3475.04kJ/kg，S o =6.7801 kJ/(kg.k). Heating regulation steam extraction pressure p h =0.118MPa, actual specific enthalpy of extraction h h =2620.52kJ/kg, backwater specific enthalpy h' h ＝334.94kJ/kg(80℃)，S h =7.1410 kJ/(kg.k), backwater rate φ =100%, η hs =0.97. Minimum condensed steam flow Dc =17000kg/h, actual exhaust specific enthalpy hc =2391.5kJ/kg, feed water specific enthalpy 315.7kJ/kg, and condensed water specific enthalpy h c '＝97.3kJ/kg，η' b ＝η b η p ＝0.88，η mg ＝η m η g =0.98. Annual heating load utilization hour ζ =4000h, ten =273.15k.
And solving the power generation coal consumption of the unit.
1. Steam consumption D o ＝(3600P e /η mg -D c (h h -h c )/(h o -h h )＝(3600*5000/0.98-17000*(2620.52-2391.5)/(3475.04-2620.52)＝210387kg/h。
2. Heating steam extraction = D o -D c ＝210387-17000＝193387kg/h。
3. Total heat consumption Q tp ＝(D o (h o -h fw ))/(η b η p *10 6 )＝755.31GJ/h。
4. Heat supply Q h ＝D h (h h -h' h )*10 -6 ＝193387*(2620.52-334.94)*10 -6 ＝442GJ/h。
5. Thermalization power generation rate ω =278 (h) o -h h )η mg /(h h -h' h )＝278(3475.04-2620.52)*0.98/(2620.52-334.94)＝101.86kWh/GJ。
6. Thermalization generated power W h ＝442*101.86＝45022.12kW。
7. Generated heat loss = Q tp /(P+W h )＝755.31/(50000+45022.12)＝7948.79kJ/kW。
8. Efficiency of electric power generation eta tp ＝3600/7948.9＝45.29％。
9. Coal consumption for power generation b tp ＝123/η tp ＝123/0.4529＝271.58g/kWh。
As shown in Table 1, the result obtained by calculation by the method is between a heat method and a power-doing capacity method, the heat method returns electricity, the technical degree of cogeneration and the heat supply quality are not fully reflected, the calculated power generation coal consumption is low, the development of the cogeneration industry can be stimulated, the further technical upgrading and energy-saving potential of the cogeneration unit are not facilitated, the power generation and supply coal consumption can be reduced only by greatly increasing the heat supply, and fair competition is also not facilitated.
Table 1: calculation results of thermal economic indexes by using three traditional distribution methods
Calculation example 2:
a300 MW cogeneration steam turbine unit has the unit model of C330/258-16.7/0.55/537/537, annual coal consumption 931851t, average low heat value 19771kJ/kg of coal, annual heat supply 2577570GJ, power generation 186591 ten thousand kWh, power supply 173885 ten thousand kWh, heating parameters: the heating extraction pressure/temperature is 0.43MPa/264.3 ℃, the heating supply/return water temperature is 84 ℃ and 65 ℃, and the supply and return water pressure is 0.8/0.2MPa respectively.
And (3) calculating the result:
(1) competition stipulations for large unit of medium-power and electric power
Electricity generation coal consumption = annual standard coal amount/electricity generation amount-72 × industrial extraction steam pressure correction coefficient-82.8 × heating extraction steam pressure correction coefficient-19771/(29310 × 1856910000) -82.8 × 1.45 × 2570/(186591 × 36) =290.83kg/kWh.
(2) Heat quantity method
Power generation coal consumption = (931851000 19771/29310-2577570: 40)/1865910000 =281.6g/kWh.
(3) Equivalent power method
Thermalization power generation ratio =278 (3394.12-2993.01) × 0.98/(2993.01-272.17) =40.16kWh/GJ.
Power generation coal consumption = (931851000 × 19771/29310)/(1865910000 +2577570 × 40.16) =319g/kWh.
After the application runs secretly for a period of time, the feedback of field technicians has the advantages that:
the calculation method is simple, convenient and practical, a unified reference is established for the economic comparison of different types of thermal power generating units, the huge difference of the power generation coal consumption and the power supply coal consumption between a pure condensation type generating unit and a heat supply generating unit is particularly reduced, the economic comparison between a heat supply unit group, a thermal power plant, a condensing type generating unit and the heat supply unit group is facilitated, and power generation enterprises are stimulated to improve the comprehensive utilization rate of energy sources by means of cogeneration, pay attention to technical progress and improve the conversion efficiency of thermal power. In particular, in recent years, in large steam turbine units developed throughout the country, the high efficiency of cogeneration units in energy utilization needs to be considered, the heating load needs to be properly embodied, and the power generation and supply coal consumption index cannot be reduced by simply increasing the heating load.
Claims (7)
1. A general calculation method for evaluating coal consumption indexes of a coal-fired heat supply unit is characterized by comprising the following steps: comprises the steps of S1 calculating the thermalization power generation rate of the heat supply unit, S2 calculating the power generation heat consumption of the heat supply unit, S3 calculating the power generation efficiency of the heat supply unit and S4 calculating the power generation coal consumption of the heat supply unit,
in the step of calculating the thermalization power generation rate of the heating unit in S1,
in formula 1: omega-thermalization Generation, kWh/GJ; h is a total of o -new steam enthalpy, kJ/kg; h is h -enthalpy of heat extraction, kJ/kg; h' h -specific enthalpy of return heat supply, kJ/kg; eta m η g -generator mechanical efficiency,%; e-relative thermalization power generation fraction,%;
in the step of calculating the power generation heat consumption of the heat supply unit S2,
in formula 4: q. q.s tp -power generation heat consumption, kJ/kWh; q tp -unit heat consumption, GJ/h; pe-actual output electric power of the unit, kW; w is a group of h -unit thermalization equivalent power, kW;
in the step of calculating the generating efficiency of the heating unit S3,
in formula 5: eta tp -generating thermal efficiency,%;
in the step of calculating the coal consumption of the heat supply unit in S4,
in formula 6: b tp -electricity generation coal consumption, g/kWh.
2. The general calculation method for evaluating the coal consumption index of the coal-fired heat supply unit according to claim 1, characterized by comprising the following steps: where e in formula 1 is the ratio of internal to external thermalization generation,
in formula 2:
-internal thermalization power generation, kW;
-external thermalization power generation, kW; d im The regenerative steam extraction amount is assumed to be kg/h; d h.t -the amount of heat supply extraction, kg/h; h is a total of im -specific enthalpy of heating steam, kJ/kg, for the hypothetical hybrid heater; h is i ' m -assuming steam condensate enthalpy, kJ/k, for the hybrid heater; h is fw -feed water enthalpy, kJ/kg;
-return water enthalpy, kJ/kg.
3. The general calculation method for evaluating the coal consumption index of the coal-fired heat supply unit according to claim 1, characterized by comprising the following steps: w h ＝Q h ω(3)
In formula 3: w is a group of h -thermalization equivalent power, kW; q h -heat supply, GJ/h.
4. The general calculation method for evaluating the coal consumption index of the coal-fired heat supply unit according to claim 1, characterized by comprising the following steps: and manually executing the steps of S1 calculating the thermalization power generation rate of the heat supply unit, S2 calculating the power generation heat consumption of the heat supply unit, S3 calculating the power generation efficiency of the heat supply unit and S4 calculating the power generation coal consumption of the heat supply unit.
5. The general calculation method for evaluating the coal consumption index of the coal-fired heat supply unit according to claim 1, characterized by comprising the following steps: and operating the computer to calculate the thermalization power generation rate of the heat supply unit by S1, calculating the power generation heat consumption of the heat supply unit by S2, calculating the power generation efficiency of the heat supply unit by S3 and calculating the power generation coal consumption of the heat supply unit by S4.
6. The general calculation method for evaluating the coal consumption index of the coal-fired heat supply unit according to claim 5, is characterized in that: and displaying the calculation result through a display connected with the computer.
7. The general calculation method for evaluating the coal consumption index of the coal-fired heat supply unit according to claim 5, is characterized in that: the calculation result is printed by a printer connected to the computer.
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