CN111928294A - Method for apportioning thermoelectric cost of gas-steam combined cycle unit - Google Patents

Method for apportioning thermoelectric cost of gas-steam combined cycle unit Download PDF

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CN111928294A
CN111928294A CN202010784634.6A CN202010784634A CN111928294A CN 111928294 A CN111928294 A CN 111928294A CN 202010784634 A CN202010784634 A CN 202010784634A CN 111928294 A CN111928294 A CN 111928294A
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power supply
unit
cost
real
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CN111928294B (en
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许凌云
史成宇
郝毅
郝俊峰
孔庆龙
王斌
贾龙
王洪昊
陕梅辰
邵华
王贝尔
李渊
赖菲
吴涛
田吴子健
曹旭
何新
王智微
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Xian Thermal Power Research Institute Co Ltd
Huaneng Taiyuan Dongshan Gas Turbine Thermal Power Co Ltd
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Huaneng Taiyuan Dongshan Gas Turbine Thermal Power Co Ltd
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Abstract

The invention discloses a method for apportioning thermoelectric cost of a gas-steam combined cycle unit, which comprises the steps of fitting a function curve of power supply power and natural gas flow by using a least square method according to historical natural gas flow and corresponding historical power supply power, and bringing the function curve into the natural gas flow of the unit to obtain the power supply power which is supposed to be sent by the unit in a corresponding time period; calculating the flow rate of the generated natural gas consumed by real-time power supply by using the real-time power supply power and the power supply power, and calculating the real-time unit power supply cost according to the current natural gas price; and subtracting the real-time power supply natural gas flow calculated in the last step from the real-time natural gas flow to obtain the real-time heat supply natural gas flow, and obtaining the real-time unit heat supply cost by combining the natural gas price. According to verification, the heat supply cost calculation result obtained by the invention renegotiates the price with the heat supply demand party, so that the loss is reduced, and the profit is obtained.

Description

Method for apportioning thermoelectric cost of gas-steam combined cycle unit
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a method for apportioning thermoelectric cost of a gas-steam combined cycle unit.
Background
The cogeneration of gas turbine power station is a comprehensive production mode which burns primary energy natural gas to release heat, and utilizes the steam which does work in the steam turbine to supply heat to users while producing electric energy. Since the production of both heat and electricity products is carried out simultaneously, the cost accounting naturally involves the cost of each of the heat and electricity products, which creates a problem of how to apportion and rationalize the cost, and this problem is currently still widely controversial. The apportionment of the thermoelectric cost influences the reasonable pricing of heat and electricity to a great extent, the apportionment results obtained by adopting different apportionment methods and standards are greatly different, and the economic benefits of the heat products and the electric products obtained by taking the different apportionment methods as the basis are also greatly different.
The problem of unreasonable thermoelectric cost allocation always troubles thermoelectric enterprises, and the reason for the situation is manifold, policy and regulation, economic law, thermodynamics and theoretical method of thermoelectric cost allocation. The thermoelectric cost is not only related to the benefits of thermoelectric enterprises, but also related to the fairness of the heat users and the fairness of the electricity users in using the products, so that the selection of a scientific and accurate apportionment method for thermoelectric apportionment is the premise of reasonably customizing prices of the heat products and the electricity products.
At present, the heat method is a universal thermoelectric cost allocation method legal in China. The heat method is deduced based on the first law of thermodynamics, the method divides the total heat consumption of the thermal power plant according to the quantity proportion of the produced electric energy and the heat energy, belongs to a 'benefit electricity return method', the apportionment method considers the electric energy and the heat energy to be equivalent, the energy quality difference is ignored, namely no matter new steam of a boiler or partial extracted steam used for heat supply is used, the calculated heat consumption is the same as long as the quantity of the heat is equal, therefore, the power supply coal consumption and the power supply cost during the co-production are greatly reduced compared with the single production, the method is simple, intuitive and convenient to examine, but the method does not reflect the difference of the heat energy and the electric energy quality, does not reflect the difference of different parameters of the heat supply steam in the quality, and finally calculates various irreversible losses in the process of the heat energy to the co-heating user, thereby the heat consumption enthusiasm of the heat user is struck, the method is not fair to heat users, the benefits brought by cogeneration are all attributed to power generation, the power generation coal consumption rate is low, the heat efficiency in the power generation process is higher than that of an ideal Rankine cycle under the same condition, and the second law of thermodynamics is violated; and does not properly reflect the thermoelectric cost, therefore, this apportionment method has a serious drawback in theory.
The heat method, the apportionment method, is extreme. Whether the apportionment method is based on the first law of thermodynamics, the second law of thermodynamics or the economic method, the artificial regulation is inevitable, and only the regulation has the basis of the regulation.
Disclosure of Invention
The invention aims to provide a simple, reasonable and more real method for sharing the thermoelectric cost of a gas-steam combined cycle unit in engineering application aiming at the problems that the conventional heat method deviates from the real power generation cost and the heat supply cost is more.
The invention is realized by adopting the following technical scheme:
a method for sharing thermoelectric cost of a gas-steam combined cycle unit comprises the steps of fitting a function curve of power supply power and natural gas flow by using a least square method according to historical natural gas flow and corresponding historical power supply power, and bringing the function curve into the natural gas flow of the unit to obtain the power supply power which the unit should send in a corresponding time period; calculating the flow rate of the generated natural gas consumed by real-time power supply by using the real-time power supply power and the power supply power, and calculating the real-time unit power supply cost according to the current natural gas price; and subtracting the real-time power supply natural gas flow calculated in the last step from the real-time natural gas flow to obtain the real-time heat supply natural gas flow, and obtaining the real-time unit heat supply cost by combining the natural gas price.
A further improvement of the invention is that the method comprises in particular:
the measured values and some calculated values of the desired measuring points are collected, as shown in tables 1 and 2:
TABLE 1 measurement points to be collected
Figure BDA0002621490480000021
Figure BDA0002621490480000031
TABLE 2 quantities to be metered
Name of survey point Unit of Symbol
Natural gas flow rate for power supply Nm3/h N1
Flow of heating natural gas Nm3/h N2
Unit cost of power supply yuan/(kW h) E1
Unit cost of heat supply Yuan/GJ E2
1) The pure condensing power supply gas consumption curve is obtained by fitting two real-time measuring point data of the unit power supply and the natural gas flow during pure condensing operation by using a least square method, namely the formula (1):
X＝d+c·N+b·N2+a·N3 (1)
n is the natural gas flow during pure condensing operation, and X is the power supply power when the natural gas flow is N;
2) calculating power supply unit cost
Assuming that the power supply power of the unit at this time is X1, the power supply cost per degree of electricity
Figure BDA0002621490480000032
3) Calculating unit cost of heat supply
At the moment, the unit heat supply gas consumption N2 is equal to N-N1, and the unit heat supply cost per GJ
Figure BDA0002621490480000033
The invention is realized by adopting the following technical scheme:
the invention provides a method for sharing the thermoelectric cost of a gas-steam combined cycle unit, which is characterized in that the method for sharing the thermoelectric cost is to scientifically divide the cost of producing electricity and heat by a certain method, calculate the proportion of the cost of an electric product to the total expenditure cost or the proportion of the cost of a heat product to the total expenditure cost, and carry out the cost accounting of a cogeneration enterprise, wherein the general requirement of the cogeneration enterprise on the method for sharing the total cost is as follows: the research of the heat and power cost sharing theory of the cogeneration unit has important theoretical and practical significance as the basis of the performance analysis of the cogeneration unit, and the rationality and the accuracy of the research directly influence the ordered development of the cogeneration enterprises.
Drawings
FIG. 1 is a flow chart of a method for apportioning the thermoelectric cost of a gas-steam combined cycle unit according to the invention.
Detailed Description
The invention is further described below with reference to the following figures and examples.
As shown in fig. 1, according to the method for apportioning the thermoelectric cost of the gas-steam combined cycle unit, firstly, according to historical natural gas flow and corresponding historical power supply power, a function curve of the power supply power and the natural gas flow is fitted by using a least square method, and the natural gas flow is brought into the unit, so that the power supply power which the unit should send in a corresponding period is obtained; calculating the flow rate of the generated natural gas consumed by real-time power supply by using the real-time power supply power and the power supply power, and calculating the real-time unit power supply cost according to the current natural gas price; and subtracting the real-time power supply natural gas flow calculated in the last step from the real-time natural gas flow to obtain the real-time heat supply natural gas flow, and obtaining the real-time unit heat supply cost by combining the natural gas price.
First, the measured values and some calculated values of the desired measuring points are collected, as shown in tables 1 and 2.
TABLE 1 measurement points to be collected
Name of survey point Unit of Symbol
Price of natural gas Yuan/Nm3 p
Natural gas flow Nm3/h N
Power supply of machine set MW X
Heat supply power of machine set GJ m
TABLE 2 quantities to be calculated
Figure BDA0002621490480000041
Figure BDA0002621490480000051
1) The pure condensing power supply gas consumption curve is obtained by fitting two real-time measuring point data of the unit power supply and the natural gas flow during pure condensing operation by using a least square method, namely the formula (1):
X＝d+c·N+b·N2+a·N3 (1)
n is the natural gas flow during pure condensing operation, and X is the power supply power when the natural gas flow is N;
2) calculating power supply unit cost
Assuming that the power supply power of the unit at this time is X1, the power supply cost per degree of electricity
Figure BDA0002621490480000052
3) Calculating unit cost of heat supply
At the moment, the unit heat supply gas consumption N2 is equal to N-N1, and the unit heat supply cost per GJ
Figure BDA0002621490480000053
The examples are as follows, and the collected measurement points are as shown in Table 3.
Table 3 example stations
Name of survey point Unit of Numerical value Symbol
Price of natural gas Element/t 2806 p
Natural gas flow t/h 47.47 N
Natural gas flow rate for power supply t/h 41.98 N1
Flow of heating natural gas t/h 5.49 N2
Power supply of machine set MW 329 X
Heat supply of the unit GJ 158.173 m
Unit cost of power supply yuan/(kW h) 0.487 E1
Unit cost of heat supply Yuan/GJ 97.34 E2
1, fitting two real-time measuring point data of unit power supply and natural gas flow during pure condensing operation by using a least square method to obtain a pure condensing power supply and gas consumption curve which is as follows:
X＝22.98+1.296·N+0.2306·N2-0.002168·N3
at this time, N is 47.47t/h, so X is 372 MW.
2 calculating the unit cost of power supply
At this time, the natural gas flow rate of the power supply is N1 (N · (X1/X) ═ 41.98 t/h.
The power supply cost per degree of electricity
Figure BDA0002621490480000061
3 calculating heat supply unit cost
At this time, the flow rate of the natural gas for supplying heat, N2, N-N1, 47.47-41.98 and t/h, 5.49 t/h.
Heating cost per GJ
Figure BDA0002621490480000062
In a certain combustion engine thermal power plant applied by the method, because the heat supply unit cost of the unit is not clear before a manager, when the manager negotiates with a hot user, the price is determined to be about 83 yuan/GJ, and after the manager is put into the system, the statistical average value of the heat supply unit cost of the unit is about 97 yuan/GJ, which is equivalent to buying and selling under the condition of loss all the time. Therefore, the combustion engine thermal power plant manager renegotiates the price with the heat supply demand party according to the heat supply cost calculation result obtained by the invention, thereby reducing the loss and obtaining the profit.

Claims (2)

1. A method for apportioning thermoelectric cost of a gas-steam combined cycle unit is characterized in that the method comprises the steps of fitting a function curve of power supply power and natural gas flow by using a least square method according to historical natural gas flow and corresponding historical power supply power, and bringing the function curve into the natural gas flow of the unit to obtain the power supply power which should be sent by the unit in a corresponding time period; calculating the flow rate of the generated natural gas consumed by real-time power supply by using the real-time power supply power and the power supply power, and calculating the real-time unit power supply cost according to the current natural gas price; and subtracting the real-time power supply natural gas flow calculated in the last step from the real-time natural gas flow to obtain the real-time heat supply natural gas flow, and obtaining the real-time unit heat supply cost by combining the natural gas price.
2. The method for the thermoelectric cost sharing of the gas-steam combined cycle unit according to claim 1, is characterized by comprising the following steps:
the measured values and some calculated values of the desired measuring points are collected, as shown in tables 1 and 2:
TABLE 1 measurement points to be collected
Name of survey point Unit of Symbol Price of natural gas Yuan/Nm3 p Natural gas flow Nm3/h N Power supply of machine set MW X Heat supply power of machine set GJ m
TABLE 2 quantities to be calculated
Name of survey point Unit of Symbol Natural gas flow rate for power supply Nm3/h N1 Flow of heating natural gas Nm3/h N2 Unit cost of power supply yuan/(kW h) E1 Unit cost of heat supply Yuan/GJ E2
1) The pure condensing power supply gas consumption curve is obtained by fitting two real-time measuring point data of the unit power supply and the natural gas flow during pure condensing operation by using a least square method, namely the formula (1):
X＝d+c·N+b·N2+a·N3 (1)
n is the natural gas flow during pure condensing operation, and X is the power supply power when the natural gas flow is N;
2) calculating power supply unit cost
Assuming that the power supply power of the unit at this time is X1, the power supply cost per degree of electricity
Figure FDA0002621490470000021
3) Calculating unit cost of heat supply
At the moment, the unit heat supply air consumption N2= N-N1, and the unit heat supply cost per GJ
Figure FDA0002621490470000022
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CN112668110A (en) * 2020-12-15 2021-04-16 浙江大学 Heat supply fuel cost apportionment method of gas-steam combined cycle cogeneration unit based on process division
CN114696691A (en) * 2022-05-31 2022-07-01 华能太原东山燃机热电有限责任公司 Safety control method and system for generator of gas turbine power plant

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