Drying kinetics of sewage sludge and simulation of its co-generation system with biomass co-gasification

REN Shaohui; XIANG Jiatao; ZHANG Shihong; GUO Peng

doi:10.19666/j.rlfd.202309149

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Drying kinetics of sewage sludge and simulation of its co-generation system with biomass co-gasification

更新时间：2025-09-28

- Drying kinetics of sewage sludge and simulation of its co-generation system with biomass co-gasification
- Thermal Power Generation Vol. 53, Issue 3, Pages: 1-13(2024)
- 作者机构：
  
  1. 华中科技大学能源与动力工程学院煤燃烧国家重点实验室
  2. 华中农业大学工学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202309149
  CLC： TK6;TM61;X703
- Published：2024
- 稿件说明：
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REN Shaohui, XIANG Jiatao, ZHANG Shihong, et al. Drying kinetics of sewage sludge and simulation of its co-generation system with biomass co-gasification[J]. Thermal power generation, 2024, 53(3): 1-13.
DOI：

REN Shaohui, XIANG Jiatao, ZHANG Shihong, et al. Drying kinetics of sewage sludge and simulation of its co-generation system with biomass co-gasification[J]. Thermal power generation, 2024, 53(3): 1-13. DOI： 10.19666/j.rlfd.202309149.

摘要

对城市污泥进行高效干燥预处理及气化资源化利用是实现城市绿色可持续发展的重要途径之一。首先，利用热重反应器研究了污泥的干燥动力学特性；其次，基于Fluent数值模拟软件明晰了高温低速烟气和低温高速烟气对污泥干燥过程的影响；最后通过Aspen Plus构建了新型的污泥与生物质共气化热电联产系统，并讨论了系统的热力性能。结果表明：污泥在热重反应器中的干燥过程分为升速阶段、第一降速阶段和第二降速阶段，以降速阶段为主；SW-60、SW-80的水分扩散系数范围分别为6.34×10~(–6)～3.72×10~(–5) m~2/s和3.69×10~(–5)～2.60×10~(–4) m~2/s；初始含水率的提高会增加污泥干燥活化能，SW-60、SW-80的干燥活化能分别为9.55 k J/mol和28.25 k J/mol；干燥床中高温低速烟气的干燥效率大约为低温高速烟气的2.67倍；在热电联产系统中，随着生物质掺混比例的增加，输入热量、空气流量、合成气低位热值、合成气产率和热电联产潜力均随之增加，然而电效率、热效率和系统效率会缓慢下降；当生物质掺混质量比为20%时，每千克30%含水率干污泥与生物质的共混物可以产生电能与热能潜力分别为0.61 k W·h和4.212 MJ。

Abstract

The efficient drying pre-treatment and gasification resource utilization of sewage sludge is one of the important ways to realize green and sustainable city development.Firstly

the thermogravimetric reactor was used to study the drying kinetics of sludge.Then

the influence of high temperature-low speed flue gas and low temperature-high speed flue gas on the sludge drying process was clarified based on Fluent numerical simulation.Finally

a new type of sludge and biomass co-gasification co-generation system was established by Aspen Plus

and the thermodynamic performance of the system was discussed.The results show that

the drying process of sludge in thermogravimetric reactor can be divided into the ascending stage

the first decreasing stage and the second decreasing stage

and the decreasing stage is the main stage.The water diffusion coefficients of SW-60 and SW-80 ranged from 6.34×10~(–6) to 3.72×10~(–5) m~2/s and 3.69×10~(–5) to 2.60×10~(–4) m~2/s

respectively.The drying activation energy of SW-60 and SW-80 was 9.55 k J/mol and 28.25 k J/mol

respectively

with the increase of initial moisture content.In the drying bed

the drying efficiency of high temperature-low speed flue gas is about 2.67times that of low temperature-high speed flue gas.In the co-generation system

as the biomass blending ratio increases

the input heat

air flow

low heating value of syngas

yield of syngas and potential of co-generation all increase.However

the electrical efficiency

thermal efficiency and system efficiency will decrease slowly.When the biomass blending ratio is 20%

the blend of 30%moisture dry sludge and biomass can produce electrical energy potential and thermal energy potential of 0.61 k W·h and 4.212 MJ per kg

respectively.

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