基于Aspen Plus的煤炭空气部分气化联合循环发电系统模拟  

Simulation of combined-cycle power system of coal/air partial gasification based on Aspen Plus

作　　者：叶超 王勤辉[1] 俞利锋 方梦祥[1] 唐健 骆仲泱 YE Chao;WANG Qinhui;YU Lifeng;FANG Mengxiang;TANG Jian;LUO Zhongyang(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;Huadian Power International Corporation Limited Zhejiang Branch,Hangzhou 310016,China)

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027 [2]华电国际电力股份有限公司浙江分公司,浙江杭州310016

出　　处：《热力发电》2018年第9期63-68,共6页Thermal Power Generation

基　　金：国家重点研发计划项目(2016YFE0102500-05)~~

摘　　要：煤炭空气部分气化联合循环发电技术采用循环流化床反应器作为气化炉和燃烧炉,煤由给料装置送入气化炉中与空气发生反应,产生燃气然后送入燃气轮机中发电;反应剩余的半焦则送入循环流化床燃烧炉中燃烧发电。本文采用甘肃华亭煤为设计煤种,利用Aspen Plus软件对煤炭空气部分气化联合循环发电技术进行模拟研究,得出了空气煤比、碳转化率对气化温度、燃气组分、燃气热值、气化效率、发电效率等因素的影响。结果表明:随着空气煤比的增大,气化温度升高,燃气热值、发电效率及气化效率降低;随着碳转化率增大,燃气的热值提高,气化效率及发电效率均增加;系统发电效率随着碳转化率增加而增加,然而当碳转化率大于80%时,发电效率的增加幅度大幅减小,因此将碳转化率选为80%较为合适,此时的发电效率约为57%,这相较于现有的煤粉燃烧发电系统有极大的提高。Combined-cycle power generation technology of coal/air partial gasification uses the circulating fluidized bed(CFB)reactor as a gasifier and a combustion furnace.Coal is fed into the gasifier by the feed device and reacts with the air to produce gas which is then sent to the gas turbine for power generation.And the remaining semicoke is then fed to the circulating fluidized bed combustion furnace for combustion and power generation.This study uses Gansu Huating coal as design coal.And a simulation study on combined-cycle power generation technology of coal/air partial gasification is conducted by using Aspen Plus.The effects of air-coal ratio,carbon conversion rate on factors such as gasification temperature,gas composition,gas calorific value,gasification efficiency and power generation efficiency are studied.The results show that,when the air-coal ratio increases,gasification temperature increases and the gas calorific value,power generation efficiency and gasification efficiency decreases.Both the gasification efficiency and power generation efficiency increases when the carbon conversion rate increases.The system power generation efficiency increases with the increasing of the carbon conversion rate.However,the carbon conversion rate is greater than 80%,the increment of power generation efficiency is reduced dramatically.Therefore,it is appropriate to select the carbon conversion as 80%,and at this time the power generation efficiency is around 57%,which is much more than the efficiency of the existing pulverized coal-fired power generation plant.

关 键 词：煤炭 部分气化 联合循环发电 循环流化床 ASPEN PLUS 

分 类 号：TQ523.6[化学工程—煤化学工程]