| In recent years,greenhouse gas emissions have triggered global climate change,and it is imperative to reduce greenhouse gas emissions.In response to this environmental crisis,my country has proposed the goal of carbon peaking and carbon neutrality.Based on my country’s current energy structure,coal still occupies an important position in my country’s economic development and energy security.Therefore,the clean and efficient use of coal is very important.The coal-based polygeneration system couples the chemical system and the power system,which can realize the comprehensive cascade conversion and utilization of coal material and energy,and improve the energy utilization efficiency of coal.Therefore,under the background of the huge reserves of low-rank coal in my country,the development of coal-based polygeneration systems and poly-generation systems based on coal pyrolysis is an effective measure to achieve clean and efficient use of low-rank coal in a considerable period of time.This paper focuses on the coal-based polygeneration carbon cycle system proposed by the research group,and conducts research from two aspects: performance analysis and energy optimization evaluation.The performance of the coal-based polygeneration carbon cycle system was initially explored.The simulation process of the coal-based polygeneration carbon cycle system was improved by using large-scale chemical process simulation software.The coal-based polygeneration carbon cycle system was simulated using Xinjiang Naomaohu coal as the raw material;the energy utilization efficiency of the system was taken as the goal,The optimal operating parameters of the system to determine the unreacted synthesis gas cycle ratio and the flue gas injection rate of the power unit;under the optimal operating parameters,the system is calculated for material,energy and exergy,and the feasibility of the system operation is explored,and compared with the traditional The co-production system is compared to highlight the advantages of the carbon cycle system;at the same time,the coal-based poly-generation carbon cycle system and the traditional coal-based poly-generation system are compared with energy efficiency and exergy efficiency,and the coal-based poly-generation carbon cycle is compared The relative energy-saving rate of the system is analyzed and calculated by the system and the unit production system.The results show that the coal-based polygeneration carbon cycle system has a better unreacted synthesis gas cycle ratio of 1.05,and a power unit flue gas injection rate of 30,000 kg/h;the exergy loss of the system gasification unit accounts for 83.2% of the total exergy loss of the system,so The exergy efficiency of the gasification unit needs to be further improved;the energy utilization rate of the carbon cycle coal-based polygeneration system is 49.7%,which is higher than that of the traditional coal-based polygeneration system;the energy efficiency of the coal-based polygeneration carbon cycle system The saving rate is 13%,which is equivalent to 18587.3 kg/h of carbon dioxide emission reduction.Carry out energy optimization and performance evaluation of coal-based polygeneration carbon cycle system.Based on the performance analysis of the coal-based polygeneration carbon cycle(CBPCC)system,it is found that the system has the potential to save energy.The new energy-saving technology-self-heating regeneration theory is used to optimize the energysaving of the CBPCC system,and the coal-based polygeneration carbon cycle(PSHR-CBPCC)system optimized for partial self-heating regeneration and the coal-based polygeneration optimized for overall self-heating regeneration are respectively proposed.(ISHR-CBPCC)system;extract the logistics data and analyze the waste heat of the three systems,and obtain the energy-saving potential of each system.Through the energy-saving design of the system,a general technology suitable for the energy-saving optimization of the self-heating regeneration theory of the polygeneration system is established Route;evaluate the performance of the energy,environment and economy of the three systems to form a general method for polygeneration system evaluation.The results show that the coal-based polygeneration system optimized for overall self-heating regeneration has the highest energy utilization efficiency and exergy efficiency,which are 53.9% and 44%,respectively.The total annual cost of the system is better than that of the CBPCC and PSHR-CBPCC systems,and is comparable to the CBPCC system.Compared with this,the carbon dioxide emissions are reduced by 90.1%,and the overall self-heating regeneration optimization is better than the local self-heating regeneration optimization,which provides ideas for energy saving and consumption reduction in the industry. |
