| The country has raised its requirements for low-carbon and clean energy in the energy industry,implemented policies such as peak shaving carbon trading,and put forward low-carbon and flexible requirements for coal-fired units.In order to meet the requirements,many units have implemented the "three linkage transformation".Coalfired cogeneration is the main heating method in the northern region of China.In order to promote the integration of new energy into the grid and reduce carbon emissions,the cogeneration units operate at peak hours and participate in carbon trading.During the peak heating period,the units are limited by the principle of "electricity determined by heat" and lack flexibility.To improve the flexibility of the units,the cogeneration units undergo thermoelectric decoupling transformation.After the transformation,the characteristics of the units change,which has an impact on the economic efficiency of the units.The carbon trading market trades carbon dioxide emissions as a commodity.When the unit’s carbon dioxide emissions exceed the quota,it is necessary to purchase the quota to avoid penalties,and vice versa,to sell the quota for profit.Carbon trading enhances the enthusiasm of the power industry to reduce emissions.To participate in carbon trading,cogeneration power plants need to be familiar with unit emission characteristics.This article first introduces the calculation method of carbon emissions and carbon emission quotas as well as carbon trading policies in detail.Based on the case unit,an extraction heating model,a low-pressure cylinder removal model,and an electric boiler model are established using EBSILION simulation software to verify the accuracy of the model.Use EBSILION software and Python program to solve the carbon emission characteristics and economy of the unit.Obtain the carbon emission distribution of three types of heating units under full operating conditions,analyze the carbon emission laws of the units,allocate the carbon emissions of the units’ heating and power supply according to the heat method,and calculate the corresponding carbon emission intensity.Solve the excess region of unit carbon emission intensity based on emission standards,and obtain the excess emission boundary for steam extraction heating units and electric boiler units,providing convenience for power plants to determine the excess carbon emission.Secondly,on the basis of known unit carbon emissions,considering unit carbon trading income,heating income,power supply income,peak shaving income,fuel cost,etc.,calculate and analyze the full operating condition income distribution of the three heating modes of units.Taking a steam extraction heating unit as an example,the proportion of the four types of revenue in the total revenue of the unit under full operating conditions is calculated,and it is concluded that the unit should give priority to power supply revenue and peak shaving revenue.Finally,based on the analysis of the electric heating boundary and the transformation cost of the five reconstruction schemes for the combination of the three heating modes during dual unit operation,the electric heating characteristics and peak shaving range of the computer group are obtained,and it is concluded that the unit should adopt different heating modes in different thermal load ranges.On the basis of considering the total revenue and carbon emissions of the unit,single objective and multi objective load optimization are conducted for the two heating modes,respectively.Single objective optimization obtains the corresponding load distribution principles for units pursuing different objectives.The Pareto frontier curve of carbon emissions and total revenue is obtained from multi-objective optimization.Carbon emissions and total revenue are positively correlated in the context of the text.The small change in carbon emissions has a significant impact on the total revenue of the unit. |
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