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Method for calculating heat supply coal consumption and power supply coal consumption of a combined heat and power generation unit

A technology for combined heat and power generation units and coal consumption for power supply, which can be used in calculations, complex mathematical operations, and joint combustion mitigation, etc., and can solve problems such as inaccurate coal consumption for power generation, cost deviation, and high heating costs.

Active Publication Date: 2021-05-18
XIAN THERMAL POWER RES INST CO LTD
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  • Application Information

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Problems solved by technology

[0007] Coal consumption for heating and power generation calculated based on real-time data is inaccurate and fluctuates greatly
Therefore, the calculated cost deviates from the real cost of power generation and heating cost. In engineering applications, a simple, reasonable and closer to the real coal consumption allocation method for power generation and heating of cogeneration units is needed.

Method used

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  • Method for calculating heat supply coal consumption and power supply coal consumption of a combined heat and power generation unit
  • Method for calculating heat supply coal consumption and power supply coal consumption of a combined heat and power generation unit
  • Method for calculating heat supply coal consumption and power supply coal consumption of a combined heat and power generation unit

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Embodiment

[0103] The relevant parameters of a power plant are shown in Table 2:

[0104] Table 2. Full Load Calculation Parameters

[0105]

[0106]

[0107] 1. Taking a cogeneration unit as an example, the pure condensing power of the unit is 670MW, and the corresponding main steam flow rate is 1865.5t / h. According to the low-pressure cylinder flow rate corresponding to the low-pressure cylinder efficiency in the steam turbine thermal characteristics book, the low-pressure cylinder efficiency curve is fitted as follows:

[0108] n l =(1.89503e-5F 2 +0.05062F+54.56328) / 100

[0109]2. Calculate the product of mechanical efficiency and generator power generation efficiency under 100%, 75%, 50%, and 40% load according to formula (3), expressed as η m n g They are: 0.981971813, 0.983555922, 0.980771111, 0.978230725, then fit η m n g The relationship curve with power generation load is:

[0110] n m n g =(8.07676e-6P 2 +0.00849P+96.13123) / 100)

[0111] 3. Therefore, accordi...

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Abstract

The invention discloses a method for calculating heat supply coal consumption and power supply coal consumption of a combined heat and power generation unit. The method comprises the following steps: 1, fitting a relation curve of low-pressure cylinder efficiency and low-pressure cylinder flow according to a thermal characteristic book of a steam turbine; 2, according to a pure condensing working condition test report, calculating data points of corresponding working conditions by utilizing a calculation formula of steam turbine shaft end generated power, and fitting a relation curve of the steam turbine shaft end power and a product of mechanical efficiency and generator efficiency; step 3, respectively calculating the generated power under the given main steam flow during pure condensation and the generated power under different heat supply powers; 4, calculating power generation heat consumption, and calculating a power generation coal consumption rate according to the power generation heat consumption; and 5, calculating the heat supply coal consumption rate. According to the invention, the relatively real and accurate heat supply coal consumption rate and power generation coal consumption rate can be calculated at the same time, and the calculation result has relatively good reliability and stability.

Description

technical field [0001] The invention belongs to the technical field of cogeneration of heat and power in coal-fired power plants, and in particular relates to a method for calculating coal consumption for heating and power supply of a cogeneration unit. Background technique [0002] Cogeneration of heat and power refers to the production mode in which the power plant not only produces electric energy, but also uses the steam done by the steam turbine generator to provide heat to the user, that is, the process of producing electric energy and heat energy at the same time, which saves fuel compared with the production of electricity and heat energy separately. . Since heat and electricity are produced at the same time, the cost of heat and electricity will naturally be involved in the cost calculation, and the cost calculation is closely related to the coal consumption of heating and power supply, which leads to the allocation of coal consumption. and allocation accuracy issu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06G06F17/18
CPCG06Q10/06393G06Q50/06G06F17/18Y02E20/14
Inventor 吴涛赖菲徐创学薛晗光王智微何新
Owner XIAN THERMAL POWER RES INST CO LTD
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