CN109460885B - Power generation energy consumption evaluation method for energy balance unit of thermal power plant - Google Patents
Power generation energy consumption evaluation method for energy balance unit of thermal power plant Download PDFInfo
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Abstract
The invention provides a power generation energy consumption evaluation method of an energy balance unit of a thermal power plant, which comprises the following steps: (1) Calculating total fuel energy Q input to an energy balance unit 1 (ii) a (2) Calculating the energy Q of the external steam and high-temperature medium input into the energy balance unit 2 (ii) a (3) Calculating dielectric energy Q outside the output unit of the energy balance unit 3 (ii) a (4) Calculating the standard coal consumption B of the energy balance unit 1 The calculation method is as follows:
calculating power supply standard coal consumption B of energy balance unit 2 The calculation method is as follows:
wherein W f For external power of energy-balancing units, W 1 Generating energy for the output of the energy-balancing unit, W 3 And outputting the on-line electric energy for the energy balance unit. The power plant energy consumption evaluation method adopts an integral energy balance mode, and can calculate the standard coal consumption for power generation and the standard coal consumption for power supply of the energy balance unit only by testing and calculating the energy input and the energy output by the energy balance unit.
Description
Technical Field
The invention relates to a power generation energy consumption evaluation method of an energy balance unit of a thermal power plant.
Background
When a thermal power plant carries out unit performance test at present, the standard coal consumption for power generation and the standard coal consumption for power supply are used as final performance indexes. When the accounting of the standard coal consumption of power generation and power supply of the generator is carried out, the uncertainty is too large because the weighing accuracy of the coal entering the boiler is very low by the positive balance accounting method. After the coal is combusted in the boiler, the heat is transferred to steam, and then the steam enters a steam turbine to do work to drive a generator to generate electricity and output electric energy. The process lasts for a long time, generally, for a large thermal power generating set, at least several minutes are needed from the combustion of pulverized coal to the power generation output of a generator, the instantaneity between the coal and the steam does not exist, and the influence of dynamic change on the result is large. Therefore, when the thermal power plant performs performance tests on the power generation standard coal consumption unit and the power supply standard coal consumption unit, an inverse balance calculation method is adopted.
When the performance of the generator set is calculated by using a conventional counter-balance method, a calculation process from micro to macro is adopted. The method comprises the steps of firstly testing and calculating the efficiency of a boiler, the efficiency of each cylinder body of a steam turbine and the heat consumption rate of the steam turbine, counting the service power consumption rate, estimating the efficiency of a pipeline, and finally calculating the standard coal consumption for power generation and the standard coal consumption for power supply of a generator set by utilizing the heat consumption, the service power consumption rate, the efficiency of the boiler and the efficiency of the pipeline of the steam turbine. In the whole testing process, all relevant detailed indexes of the whole generator set are required to be tested and calculated, and then the final result can be calculated. Because each test has measurement error and calculation error, and after various errors are superposed, the final calculated result deviation of different testers is often very large, and disputes of various accuracies exist.
In addition, when the performance of the generator set is checked by using a conventional counter-balance method, the performance of only a single generator set can be checked, and the performance of a plurality of same generator sets or even the whole plant can not be checked at the same time. But the average performance index of the whole plant can be calculated only after the performance test is carried out on each unit. The test period is long, the measuring points are multiple, the accumulated error in the calculation process is large, the cost for checking performance indexes is high, and the accuracy is low.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for testing and evaluating an energy balance unit of a thermal power plant, which has simple and easy-to-operate process, can quickly and accurately calculate the standard coal consumption for power generation and the standard coal consumption for power supply of the energy balance unit, has no direct correlation between the standard coal consumption for power generation and the standard coal consumption for power supply, and reduces the statistical process of station service power.
To solve the technical problem, the invention adopts the following technical scheme:
a power generation energy consumption evaluation method of an energy balance unit of a thermal power plant comprises the following steps:
(1) Calculating the total fuel energy Q input to the energy balance unit 1 The calculation method is as follows:
wherein D gs Is the main water supply flow rate H gs Is the enthalpy of the main feed water, H zq Is the main steam enthalpy value, D zr For hot section reheat steam flow, H zr For the enthalpy of the hot-zone reheat steam, D lzr For cold reheat steam flow, H lzr For cold section reheat steam enthalpy, D zj For reheating attemperation water flow, H zj For reheating desuperheated water enthalpy value, q 2 For boiler exhaust heat loss, q 3 Heat loss due to incomplete combustion of combustible gas, q 4 Heat loss due to incomplete combustion of solids, q 5 Is the physical heat loss of the ash, q 6 Heat dissipation loss for the boiler;
(2) Calculating the energy Q of the external steam and high-temperature medium input into the energy balance unit 2 The calculation method is as follows:
wherein H 0 Is the enthalpy of the condensed water in the thermodynamic system, D qi For input of steam flow, H qi Is the input steam enthalpy value;
(3) Calculating medium energy Q outside the output unit of the energy balance unit 3 The calculation method is as follows:
wherein D oi For output of steam flow, H oi Is the enthalpy value of the output medium;
(4) Calculating the standard coal consumption B of the energy balance unit 1 The calculation method is as follows:
calculating power supply standard coal consumption B of energy balance unit 2 The calculation method is as follows:
wherein W f Is an energy balance unitFrom the electrical energy, W 1 Generating energy for the output of the energy-balancing unit, W 3 And outputting the on-line electric energy for the energy balance unit.
The energy balancing unit can be a unit-made unit or a plurality of units or the whole thermal power plant. Correspondingly, the energy consumption evaluation of a unit-made unit, the energy consumption evaluation of a plurality of units and the energy consumption evaluation of the whole thermal power plant are obtained through calculation.
The principle of the method of the invention is as follows: the total energy input by the generator set is the total energy consumption of the generator set, the total energy is divided by the power of the generator outlet of the generator set into the standard coal consumption for power generation and the power of the generator set on the internet into the standard coal consumption for power supply, and the calculation result of the standard coal consumption for power supply and the standard coal consumption for power generation has no direct relation with the plant power consumption rate of the generator set.
The total energy consumption of the generator set has the following three modes:
1. total energy of fuel
And calculating the boiler efficiency of the generator set under the load condition by using an inverse balance calculation method of the boiler. Calculating the energy absorbed by the main feed water from the boiler by using the flow of the main feed water, and attributing all energy loss and the like caused by leakage of the boiler as the energy absorbed from the boiler; calculating the energy absorbed by the reheating system from the boiler by using the flow of the cold-section reheating steam and the flow of the reheater desuperheating water; the sum of which is the energy absorbed by the steam system from the boiler. The energy absorbed by the steam system is divided by the boiler efficiency, and the total energy of the fuel directly input by the energy body from the outside is calculated.
2. Total energy of steam
The enthalpy difference between the enthalpy values of various types of steam and the enthalpy value of condensed water generated by a steam turbine condenser is the internal energy of unit steam, the input energy of various types of steam is the sum of the steam flow and the internal energy of the unit steam, and the total energy of the steam is calculated.
3. Total amount of electric energy
The generator set indirectly inputs the sum of the total electric energy used for various purposes from the outside.
The power generation energy consumption calculation method is not only suitable for energy consumption calculation of a single generator set; the method is also suitable for accounting the whole energy consumption level of a plurality of similar generating sets and even the whole energy consumption level of the whole thermal power plant by using a plurality of adjacent generating sets and even the whole thermal power plant as a whole energy balance unit.
The invention has the following beneficial effects:
(1) According to the power plant energy consumption evaluation method, a single power generating unit or a plurality of same types or even the whole thermal power plant is used as an integral energy balance unit in an integral energy balance mode, the power generation standard coal consumption and the power supply standard coal consumption of the energy balance unit can be calculated only by testing and calculating the energy input and the energy output by the energy balance unit, the power generation standard coal consumption and the power supply standard coal consumption do not have a direct incidence relation, and the statistical process of station service power is reduced;
(2) The power plant energy consumption evaluation method adopts a macroscopic calculation method, various different microscopic calculations such as calculation of heat consumption rate of a steam turbine, statistics of plant power consumption rate and the like do not need to be carried out on the whole energy balance unit, error accumulation of various calculation links does not exist in the calculation process, measuring points used in the test are few, the calculation process is short, and the final accuracy of the calculation is more accurate and visual than that of the traditional evaluation method;
(3) When the energy balance unit input energy is calculated, because the calculation error of the total fuel energy is larger, the method adopts a calculation mode of boiler input energy reverse balance, and can accurately calculate the total fuel energy only by calculating the boiler efficiency, the internal energy increase of main water which becomes main steam and the internal energy increase of reheat steam; the total energy of the steam takes the enthalpy difference between the input steam and the low-pressure condensed water as the unit mass energy of the steam, and the total energy of the steam with different mass and quality can be correspondingly calculated; the input electric energy is calculated, the total electric energy which completely enters the unit from the outside of the energy balance unit does not include the electric energy which is used for auxiliary machines of the unit and is taken by the high-plant transformer from the steam turbine generator of the unit.
(4) According to the power plant energy consumption evaluation method, transformer loss, loss in an electric energy transmission process, motor efficiency loss and the like of a generator set in the power generation process are also used as an energy input part in the power generation process, so that the calculation loophole that the direct electric energy consumption of an electric auxiliary machine used in the unit is only counted in the auxiliary power statistics process and the energy consumption of the part is ignored is avoided;
(5) The power plant energy consumption evaluation method can simultaneously carry out performance accounting on a plurality of same units even the whole plant, and has the advantages of short test evaluation period, simple process, high accuracy and low cost.
Drawings
FIG. 1 is a flow chart of the calculation of the input fuel energy of the energy balance unit of the power generation energy consumption evaluation method of the present invention;
FIG. 2 is a flow chart of the calculation of the energy of the high-temperature medium of the energy balance unit according to the evaluation method of the power generation energy consumption;
FIG. 3 is a flow chart of energy consumption calculation of the energy balance unit according to the power generation energy consumption evaluation method of the present invention.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.
The method for evaluating the power generation energy consumption of the 600MW thermal power generator set shown in the figures 1-3 comprises the following steps:
(1) Calculating total fuel energy Q input into the thermal generator set 1 The calculation method is as follows:
wherein D gs Is the main water supply flow rate H gs Is the enthalpy of the main feed water, H zq Is the main steam enthalpy value, D zr For hot section reheat steam flow, H zr For the enthalpy of the hot-zone reheat steam, D lzr For cold reheat steam flow, H lzr For cold section reheat steam enthalpy, D zj For reheating attemperation water flow, H zj Is the enthalpy of the reheated desuperheater, q 2 For boiler exhaust heat loss, q 3 Is combustible for fuelHeat loss due to incomplete combustion of gas, q 4 Heat loss due to incomplete combustion of solids, q 5 Is the physical heat loss of ash, q 6 Heat dissipation loss for the boiler;
(2) Calculating energy Q of external steam and high-temperature medium input into thermal power generator set 2 The calculation method is as follows:
wherein H 0 Is the enthalpy of the condensed water in the thermodynamic system, D qi For input of steam flow, H qi Is the input steam enthalpy value;
(3) Calculating medium energy Q outside output unit of thermal generator set 3 The calculation method is as follows:
wherein D oi For output of steam flow, H oi Is the enthalpy value of the output medium;
(4) Calculating standard coal consumption B of thermal power generator set 1 The calculation method is as follows:
calculating the standard coal consumption B of the energy balance unit 2 The calculation method is as follows:
wherein W f For external power of energy-balancing units, W 1 Generating energy for the output of the energy-balancing unit, W 3 And outputting the on-line electric energy for the energy balance unit.
The related parameters of the generator set in the embodiment, the conventional calculation method and the calculation result of the power generation energy consumption evaluation method are shown in the table 1.
TABLE 1 conventional calculation method for generating energy consumption of generator set and calculation result of generating energy consumption evaluation method of the invention
As can be seen from Table 1, the power generation energy consumption method of the thermal power generator set can accurately calculate the power generation standard coal consumption and the power supply standard coal consumption of the power generator set, and compared with the conventional calculation method, the power generation standard coal consumption and the power supply standard coal consumption do not have a direct correlation, so that the statistical process of station service power is reduced.
Claims (5)
1. A method for evaluating the power generation energy consumption of an energy balance unit of a thermal power plant is characterized by comprising the following steps:
(1) Calculating total fuel energy Q input to an energy balance unit 1 ；
(2) Calculating the energy Q of the external steam and high-temperature medium input into the energy balance unit 2 ；
(3) Calculating dielectric energy Q outside the output unit of the energy balance unit 3 ；
(4) Calculating the standard coal consumption B of the energy balance unit 1 The calculation method is as follows:
calculating power supply standard coal consumption B of energy balance unit 2 The calculation method thereofThe following were used:
wherein W f For external power of energy-balancing units, W 1 Generating energy for the output of the energy-balancing unit, W 3 And outputting the on-line electric energy for the energy balance unit.
2. Method for evaluating the energy consumption of a thermal power plant in terms of energy balance unit generation according to claim 1, characterized in that in step (1) Q 1 The calculation method is as follows:
wherein D gs Is the main water supply flow rate H gs Is the enthalpy of the main feed water, H zq Is the main steam enthalpy value, D zr For hot section reheat steam flow, H zr For the enthalpy of the hot-zone reheat steam, D lzr For cold reheat steam flow, H lzr For cold section reheat steam enthalpy, D zj For reheating attemperation water flow, H zj For reheating desuperheated water enthalpy value, q 2 For boiler exhaust heat loss, q 3 Heat loss due to incomplete combustion of combustible gas, q 4 Heat loss due to incomplete combustion of solids, q 5 Is the physical heat loss of the ash, q 6 Is the heat loss of the boiler.
3. The method for evaluating the power consumption of a thermal power plant energy balance unit according to claim 1, wherein Q in step (2) 2 The calculation method is as follows:
wherein H 0 For coagulation in thermodynamic systemsEnthalpy of bonded water, D qi For input of steam flow, H qi Is the input steam enthalpy value.
4. The method for evaluating the power consumption of a thermal power plant energy balance unit according to claim 1, wherein Q in step (3) 3 The calculation method is as follows:
wherein D oi For output of steam flow, H oi To output the enthalpy of the medium.
5. Method for evaluating the energy consumption of a thermal power plant in an energy balance unit according to any of claims 1-4, wherein the energy balance unit is a unit or several units or the whole thermal power plant.
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| JPH11229820A (en) * | 1998-02-10 | 1999-08-24 | Tokyo Electric Power Co Inc:The | Thermal efficiency diagnosis and device of thermal power plant |
| CN104732451A (en) * | 2015-03-10 | 2015-06-24 | 国家电网公司 | Low-pressure economizer energy saving assessment method applied to power plant thermal system |
| CN105956370A (en) * | 2016-04-22 | 2016-09-21 | 上海发电设备成套设计研究院 | Method for coal-fired power plant to calculate coal consumption and other economic indicators in real time |
| WO2017050207A1 (en) * | 2015-09-21 | 2017-03-30 | 华北电力科学研究院有限责任公司 | Method for analyzing energy efficiency of generator set |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11229820A (en) * | 1998-02-10 | 1999-08-24 | Tokyo Electric Power Co Inc:The | Thermal efficiency diagnosis and device of thermal power plant |
| CN104732451A (en) * | 2015-03-10 | 2015-06-24 | 国家电网公司 | Low-pressure economizer energy saving assessment method applied to power plant thermal system |
| WO2017050207A1 (en) * | 2015-09-21 | 2017-03-30 | 华北电力科学研究院有限责任公司 | Method for analyzing energy efficiency of generator set |
| CN105956370A (en) * | 2016-04-22 | 2016-09-21 | 上海发电设备成套设计研究院 | Method for coal-fired power plant to calculate coal consumption and other economic indicators in real time |
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