A Calculation Method of Heat-to-Electric Ratio of Heating Unit Considering Energy Quality Coefficient

Abstract

The invention discloses a calculation method for the heat-to-electricity ratio of a heating unit considering the energy quality coefficient, and relates to the technical field of the operation of the heating unit in a thermal power plant, including the external heat supply of the heating unit calculated by using the calorimetry method and the actual enthalpy drop method, and the steam turbine supply Calculation of heat energy quality coefficient, heat energy quality coefficient for heat users, energy quality coefficient ratio of heat user heat and steam turbine heat supply, and finally obtain heat-to-electricity ratio of heating unit considering energy quality coefficient. The present invention firstly proposes a calculation method of the heat-to-electricity ratio of the heating unit considering the energy quality coefficient, which better reflects the utilization effect of the exergy of the thermal system, and is of great significance for improving the thermal economy of the heating unit operation and for the energy saving and emission reduction of the thermal power industry .

Description

technical field [0001] The invention relates to the technical field of operation of a heat supply unit in a thermal power plant, in particular to a calculation method for heat-to-electricity ratio of a heat supply unit considering the energy quality coefficient. Background technique [0002] In order to ensure the sustainable development of the economy and society, higher requirements are put forward for improving the comprehensive utilization rate of energy, reducing the cost of energy use, and reducing the emission of air pollutants. As an advanced form of energy utilization, combined heat and power central heating uses the waste heat generated by cogeneration 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 saving and environmental protection, and can adapt to future energy development trends. It 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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