Abstract
A technique was developed to optimize operations of a combined heat and power (CHP) plant taking into account changes in thermal loads. The technique is based on determining the relationship between changes in the price of electricity and changes in the price of heat. The price range is determined, on the basis of which the Pareto-optimal set of decisions is built. This set of solutions helps to find options for technical solutions that ensure the competitiveness of CHP plant relative to single-product heat and power generating plants and the most effective option to choose. It is required to solve three optimization problems to construct a Pareto-optimal set of solutions: the problem of minimizing the price of electricity for a given heat price and the rate of return on investment, the problem of minimizing the energy price to determine the maximum heat price, and the problem of minimizing the exergy price to find the minimum boundary of the heat price range. The technique was tested on the example of a cogeneration gas turbine plant. The cogeneration gas turbine plant has a waste-heat boiler and a contact heat exchanger for heating the make-up network water. The heat price range for the investigated a cogeneration gas turbine plant has been determined. Optimization studies of the operating modes of a cogeneration gas turbine plant were carried out in this range with a certain step. The results obtained can be used to select the optimal technical solutions, select the optimal combination of circuit-parametric solutions that ensure the competitiveness of the products of a cogeneration gas turbine plant.
Highlights
The share of combined heat and power (CHP) plants (CHPP) for energy generation has some growth in the Russian Federation (RF) and some countries
The technique for determining the relationship between the change in the price of electricity of a cogeneration CHPP from the change in the price of heat was developed taking into account changes in heat loads
The Pareto-optimal set of solutions helps to determine the options for technical solutions to ensure the competitiveness of CHPPs relative to single-product heat and power generating CHPPs and to choose the most efficient option
Summary
The share of CHP plants (CHPP) for energy generation has some growth in the Russian Federation (RF) and some countries. CHPPs that work by burning fossil fuels retain their competitiveness, despite the development of alternative energy. The development of optimal technological schemes, including the use of waste gas heat recovery technologies, the operation of units in the cogeneration mode, which, as a rule, provides the highest energy and economic efficiency, increase the competitiveness of CHPPs [1,2,3,4,5]. Energy producers need to know the price range of energy products at which their sale will be profitable, taking into account all the rules and restrictions on the operation of equipment. The heat load of cogeneration CHPPs depends on the climatic characteristics of the region of operation and the prices for the types of energy produced are interrelated. The choice of optimal technical solutions, the selection of the optimal combination of circuit-parametric solutions for CHPP can be done using modern means of mathematical
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