灰化温度和热解气氛对污泥灰热力学特性的影响

穆林 1; 赵晨 1; 徐芷凌 1; 陈灿若 1; 尚妍 1; 赵亮 1; 2; 杨竹强 1; 2

doi:10.7652/xjtuxb201905011

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灰化温度和热解气氛对污泥灰热力学特性的影响

更新时间：2025-07-09

- 灰化温度和热解气氛对污泥灰热力学特性的影响
- Effects of Ashing Temperature and Pyrolysis Atmosphere on Thermodynamic Properties of Sewage Sludge Ash
- 西安交通大学学报 2019年53卷第5期页码：73-81
- 作者机构：
  
  1. 大连理工大学能源与动力学院,辽宁,大连,116024
  2. 大连理工大学海洋能源利用与节能教育部重点实验室,辽宁,大连,116024
- 作者简介：
- 基金信息：
  
  : 2018-10-15。作者简介: 穆林(1982—),男,副教授;杨竹强(通信作者),男,讲师。基金项目: 国家自然科学基金资助项目(51406025);中央高校基本科研业务费专项资金资助项目(DUT15RC(4)17,DUT18JC25)
- DOI：10.7652/xjtuxb201905011
  中图分类号： TK6
- 网络首发：2019-05-10，
  
  纸质出版：2019
- 稿件说明：
移动端阅览
穆林 1, 赵晨 1, 徐芷凌 1, 等. 灰化温度和热解气氛对污泥灰热力学特性的影响[J]. 西安交通大学学报, 2019,53(5):73-81.

Effects of Ashing Temperature and Pyrolysis Atmosphere on Thermodynamic Properties of Sewage Sludge Ash[J]. 2019, 53(5): 73-81.
穆林 1, 赵晨 1, 徐芷凌 1, 等. 灰化温度和热解气氛对污泥灰热力学特性的影响[J]. 西安交通大学学报, 2019,53(5):73-81. DOI： 10.7652/xjtuxb201905011.

Effects of Ashing Temperature and Pyrolysis Atmosphere on Thermodynamic Properties of Sewage Sludge Ash[J]. 2019, 53(5): 73-81. DOI： 10.7652/xjtuxb201905011.

摘要

通过对污泥灰样微观形貌、化学组成、矿物质转化、热力学特性以及加热过程中潜在的物理化学变化进行分析和探讨

获得了灰化温度以及热解气氛等对污泥灰样理化特性及热力学特性的影响规律。实验结果表明

污泥灰样呈典型的多孔特性

在热处理过程中易发生变形、烧结和熔融。灰样的主要化学成分为SiO

、Al

、P

、CaO、Fe

和MgO

并以石英、硬石膏、白磷钙石、磷酸钙、磷酸铁钙、硅线石以及钙长石等矿物质形式存在。污泥灰样中的含磷矿物质及其转化过程对污泥灰矿物质演变和热力学特性影响显著

过量的磷酸盐离子会优先结合硬石膏中原本与硫酸根离子结合的钙离子

形成高熔点的白磷钙石和易分解的硫酸铝

从而导致硬石膏的分解并以SO

或SO

的形式释放S元素。同步热分析实验表明

污泥灰样A在空气气氛条件下经历了4个热力过程

分别为外在水分蒸发

白云母脱羟基和结晶水析出

白云石、方解石和白云母分解以及矿物质熔融和硬石膏分解

而污泥灰样B则表现为3个热力过程

分别为外在水分蒸发

以晶体转化、非晶体或无定形物质形成为主的微质量损失过程以及硬石膏分解和气相产物释放。灰样在氮气气氛中的热力学特性与空气气氛中相似

但总质量损失低于空气气氛中的总质量损失。

Abstract

Microscopic morphology

mineral evolution

thermodynamic properties and potential physicochemical changes of sewage sludge ashes were analyzed in order to investigate the effects of ashing temperatures and atmospheres on the physicochemical and thermodynamic properties of sewage sludge ashes. Results showed that sewage sludge ash has the typical porous structure

which is prone to deform and melt during thermal treatment. The major chemical compositions of the ash samples include Si

CaO

and MgO. The main crystalline phases in the ash samples are quartz

anhydrite

whitlochite

calcium aluminum phosphate

calcium iron phosphate

sillimanite and anorthite. Phosphorus in ash samples has an important effect on mineral evolution. An excess of phosphate may contend for calcium ions chemically combined with sulphate in the anhydrite

forming calcium phosphate with high melting point and readily decomposable aluminium sulphate

thereby causing decomposition of anhydrite and release of sulphur in the form of SO

or SO

. The thermal behavior of ash sample A in air atmosphere includes four thermal processes: evaporation of external moisture; dehydroxylation of muscovite and crystal water loss; decomposition of dolomite

calcite and muscovite; and mineral melting and decomposition of anhydrite. While ash sample B illustrates three thermal processes: evaporation of external moisture; crystal transformation or amorphous substance formation; and decomposition of anhydrite and gaseous product release. The thermal behaviors of the ash samples in N

atmosphere are similar with those in air atmosphere

while the weight loss in air atmosphere is more significant than in N

atmosphere.

关键词

Keywords

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