Study on the effect of calcium oxide addition on generation characteristics of tar in sludge pyrolysis system coupled with molten salt energy storage

LIU Shuai; CHEN Zhuo; ZHANG Wenjing; LONG Yanbo; ZUO Yuanjun; CAO Chengyang; HU Hongyun

doi:10.19666/j.rlfd.202210253

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Study on the effect of calcium oxide addition on generation characteristics of tar in sludge pyrolysis system coupled with molten salt energy storage

更新时间：2025-09-28

- Study on the effect of calcium oxide addition on generation characteristics of tar in sludge pyrolysis system coupled with molten salt energy storage
- Thermal Power Generation Vol. 52, Issue 2, Pages: 119-125(2023)
- 作者机构：
  
  1. 高效清洁火力发电技术湖南省重点实验室(国网湖南省电力有限公司电力科学研究院)
  2. 华中科技大学煤燃烧国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202210253
  CLC： X703
- Published：2023
- 稿件说明：
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LIU Shuai, CHEN Zhuo, ZHANG Wenjing, et al. Study on the effect of calcium oxide addition on generation characteristics of tar in sludge pyrolysis system coupled with molten salt energy storage[J]. Thermal power generation, 2023, 52(2): 119-125.
DOI：

LIU Shuai, CHEN Zhuo, ZHANG Wenjing, et al. Study on the effect of calcium oxide addition on generation characteristics of tar in sludge pyrolysis system coupled with molten salt energy storage[J]. Thermal power generation, 2023, 52(2): 119-125. DOI： 10.19666/j.rlfd.202210253.

摘要

熔盐储能耦合污泥热解是一种污泥新型热处理方法

通过构建快速、均匀的热解环境有望同步实现污泥减量处置和热解焦油回收。通过高精度宽升温速率热解实验台架模拟了熔盐储能耦合污泥热解过程高升温速率热解环境

解析了升温速率、CaO掺杂比对污泥快速热解焦油产物生成特性的影响。结果表明:升温速率在低热解温度下对污泥热解焦油产率影响较大

热解温度为350℃时

升温速率从60℃/min提升到6 000℃/min

焦油产率相对增加了约14%;同时

CaO的掺杂会使焦油产率大幅下降

掺杂质量分数10%的CaO会致使焦油产率下降约39%～43%;CaO掺杂比对焦油内多组分相对质量分数影响显著

这主要是由于CaO可以在热解过程中充当催化剂和传热阻滞剂。研究成果有助于熔盐储能耦合污泥热解技术热解工况调控

获取高附加值污泥热解焦油产品。

Abstract

A sludge pyrolysis system coupled with molten salt storage is an emerging novel thermal treatment technique for sludge disposal

which can simultaneously realize reduction and tar recovery by constructing rapid and homogeneous pyrolysis conditions. The effects of heating rate and calcium oxide(CaO) addition on the production characteristics of tar during sludge pyrolysis coupled with molten salt storage system were investigated via a high-precision optical wide heating rate pyrolysis apparatus. The results show that

the heating rate affected the tar yield at low pyrolysis temperatures. The tar yield increased by 14% at 350 ℃ when the heating rate increased from 60 ℃/min to 6 000 ℃/min. Meanwhile

the CaO addition could result in a sharp decrease in tar yield

an 39%～43% decrease could be observed with 10% CaO addition. Also

the CaO addition significantly affected the relative content of the compounds in tar

which was attributed to the fact that CaO could act as a catalyst and heat transfer retardant. The results are helpful to the pyrolysis condition regulation and high value-added tar obtain for the sludge pyrolysis system coupled with molten salt storage.

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