Research On Thermoelectric Cost-apportion Of The Gas Turbine Combined-cycle Combined Heat And Power Generation Unit Based On Energy Grade

The gas turbine combined-cycle(GTCC)combined heat and power generation unit(CHP)system has the advantages of high energy utilization,reliability,flexibility,and high degree of cleanliness.The construction of GTCC CHP and the central heating system in that require a large amount of steam heat load is an important way for high-quality industrial development.The construction of central heating systems in industrial parks often involves multiple investment entities in the source,network,and other links.The heating cost of the cogeneration unit can be calculated scientifically and accurately to reasonably allocate the heating benefits.This article quantitatively analyzes the utilization value of various energy in the process of gas turbine combined-cycle heat and power cogeneration from the perspective of energy grade.Then it puts forward the concept of energy grade quantitative coefficient,and establishes a thermoelectric cost allocation calculation model that integrates the relationship between energy cascade utilization and thermoelectric load.Using Ebsilon software,this article conducts steadystate modeling analysis and evaluation of cogeneration units,calculate and compare multiple sets of heat and power load combinations using different cost allocation methods.This thermoelectric cost allocation calculation model comprehensively considers the energy cascade utilization relationship of the gas-steam combined cycle and the combined conditions of the heat and power load under specific working conditions.It can reasonably allocate the fuel cost to both heating and power generation,and provide decision-making basis for setting heating and power generation prices.The main research contents are as follows:This article discusses the technology and method of modular modeling method of energy power system,and discusses the mechanism model of compressor,combustor,turbine and other components with gas turbine as an example.According to the thermal balance diagram of the thermal system project model of the gas-steam combined heat and power combined cycle unit,the Ebsilon modeling and simulation platform was used to model the design conditions of the gassteam combined cycle unit,and the error was checked and simulated.The error is controlled within the acceptable range of the study.Based on the checked design model,a variety of derivative operating conditions of the unit were modeled and simulated.A calculation method for the ratio of heat and electricity to the relationship between comprehensive energy cascade utilization and heat and electricity load is proposed.This article discusses the shortcomings of several traditional calculation methods of the heat and power apportionment ratio.The energy cascade utilization method introduces the energy grade quantitative coefficient A.After the energy grade quantitative coefficient is obtained through the data obtained from the modeling,the weight ratio coefficient of the heating and power supply in the gas-steam combined cycle system can be obtained,and the energy loss in the whole process can be obtained.According to the weight ratio coefficient distribution,the final heat and power apportionment ratio is obtained.Based on the working condition data obtained from the Ebsilon simulation model in Chapter 2,this chapter calculates the results of the relationship between the comprehensive energy cascade utilization and the thermoelectric load and the four traditional thermoelectric apportionment ratio methods,and compares them.Compared with the traditional method,the advantage of this method is that it can better embody the principle of energy grade cascade utilization of the gas-steam combined cycle.Using the energy grade-based gas-steam combined cycle cogeneration unit heat and power cost allocation method proposed in this paper,combined with actual cost data,a calculation model is proposed,and the calculation results of load heating costs under multiple working conditions are obtained.Furthermore,by using the calculation results,the load distribution plan of the steam supply in the industrial park can provide the heat supplier or the power generator with an economically optimized plan.