Methods comparison of drying waste wood by waste heat from flue gas of circulating fluidized bed boiler

LI Wei; LYU Guojun; JIANG Xuguang; ZHANG Shaorui; WU Lei; YAN Jianhua; YUAN Weizhong; CHEN Xijiong; LUO Weizhong

doi:10.19666/j.rlfd.201707081

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Methods comparison of drying waste wood by waste heat from flue gas of circulating fluidized bed boiler

Thermal Power Generation Vol. 47, Issue 4, Pages: 9-13(2018)

更新时间：2025-09-28

- Methods comparison of drying waste wood by waste heat from flue gas of circulating fluidized bed boiler
- 作者机构：
  
  1. 浙江大学能源清洁利用国家重点实验室
  2. 浙江浙能长兴发电有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201707081
  CLC： TK115
- Published Online：09 April 2018，
  
  Published：2018
- 稿件说明：
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LI Wei, LYU Guojun, JIANG Xuguang, et al. Methods comparison of drying waste wood by waste heat from flue gas of circulating fluidized bed boiler[J]. Thermal Power Generation, 2018, 47(4): 9-13.
DOI：

LI Wei, LYU Guojun, JIANG Xuguang, et al. Methods comparison of drying waste wood by waste heat from flue gas of circulating fluidized bed boiler[J]. Thermal Power Generation, 2018, 47(4): 9-13. DOI： 10.19666/j.rlfd.201707081.

摘要

为解决浙江某生物质电厂75 t/h循环流化床生物质直燃锅炉运行中存在的排烟温度高达180~190℃带来的效率降低

以及燃料废木材含水率超过45%会导致锅炉熄火的问题

提出利用锅炉尾部烟气余热加热空气、水等不同介质将排烟温度降低至150℃以下

同时利用加热后的介质间接干燥废木材

从而将废木材含水率降低5%左右

达到锅炉对燃料含水率的适应范围要求。同时

通过对不同介质加热废木材的能量平衡和质量平衡计算以及经济性分析

认为利用循环流化床锅炉烟气余热干燥废木材的最佳干燥方式为空气预热器加干燥机方案。

Abstract

In order to solve the problem of the low efficiency brought by the exhaust gas temperature up to 180~ 190 ℃ of a 75 t/h biomass circulating fluidized bed boiler in a biomass power plant in Zhejiang and the boiler flameout brought by the water content of the waste wood higher than 45%

this study presents that

the exhaust gas temperature is reduced to below 150 ℃ by using the boiler waste heat to heat air

water and other different media.And the waste wood moisture content is decreased to 5% by using the heated medium to dry wood waste indirectly to meet the water content requirements of fuel for the boiler.Meanwhile

the energy balance

mass balance and economic efficiency of heating waste wood by different media are calculated.The results show that the method of air preheater plus dryer is considered to be the best drying method of dry waste wood by the waste heat from flue gas of circulating fluidized bed boiler.

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