Heat supply unit thermoelectric ratio calculation method considering energy quality coefficient

Abstract

The invention discloses a heat supply unit thermoelectric ratio calculation method considering an energy quality coefficient, and relates to the technical field of thermal power plant heat supply unitoperation. The method comprises the following steps: calculating the external heat supply amount of a heat supply unit, the heat supply energy quality coefficient of a steam turbine, the heat energyquality coefficient of a heat user, the heat consumption of the heat user and the energy quality coefficient ratio of steam turbine heat supply by adopting a heat method and an actual enthalpy drop method, and finally obtaining the heat supply unit thermoelectric ratio considering the energy quality coefficient. According to the method, firstly, the heat supply unit thermoelectric ratio calculation method considering the energy quality coefficient is provided, the utilization effect of a thermodynamic system is better reflected, and the method has important significance in improving the operation heat economy of the heat supply unit and saving energy and reducing emission in the thermal power industry.

Description

Technical field [0001] The invention relates to the technical field of the operation of heat supply units in thermal power plants, in particular to a method for calculating the heat-to-electricity ratio of heat supply units in consideration of energy quality coefficients. Background technique [0002] In order to ensure the sustainable development of the economy and society, higher requirements have been put forward for improving the comprehensive utilization of energy, reducing energy costs, and reducing air pollutant emissions. As an advanced form of energy utilization, central heating by combined heat and power uses the waste heat of combined heat and power units to meet the cooling and heating needs of industries and households in nearby areas. It has the advantages of high comprehensive energy utilization efficiency, energy conservation and environmental protection, and adaptability to future energy development trends. , Is one of the main ways to solve the problems of unreas...

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Problems solved by technology

At present, there are many methods for calculating the heat-to-electricity ratio, each with its advantages and disadvantages: the heat method is to distribute the total heat consumption according to the proportion of the heat used for heating and power supply. The biggest advantage of this method is that it is simple and easy to implement, but it is only considered from the perspective of quantity For energy distribution, the heat supply of steam with different parameters is treated as equivalent, so that the heat sharing ratio is too large, and the economic benefits brought by cogeneration are all attributed to power generation, and heat users cannot be encouraged to improve the heat utilization process to use as low as possible. Heat of energy quality coefficient; Actual enthalpy drop method distributes the total heat consumption according to the ratio of the actual enthalpy drop of extracted steam to the actual enthalpy drop of fresh steam, taking into account the difference in grade of heating steam, which can encourage heat users Use as much heat as possible with a low energy quality coefficient, but it allocates the loss of the cold source to the power generation, and attributes the economic benefits brought by the combined heat and power to the heating; The analysis method is based on the heat supply and extraction of the steam turbine with Xinqi The proportion of the total heat consumption is allocated to reflect the difference in energy quality, but only the convertible part of the energy is considered— Utilization of energy, but ignores the non-transformable part of the energy—Utilization of Wu, completely using To measure the difference in energy quality, the calculation result is also beneficial to heat users and not conducive to power generation.

Analytical method due to lack of vapor property diagrams The parameters are inconvenient to use. At present, the more common calculation methods for heat-to-electricity ratio in China are calorimetric method (benefits return to electricity method) and actual enthalpy drop method (benefits are returned to heat method), but the calculation results obtained by these two calculation methods are used to judge thermal power units. The thermal energy utilization rate and energy saving degree have a certain one-sidedness

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