A novel integrated cascade absorption refrigeration technology by using waste heat in CTG's methanation process

YANG Sheng; LIANG Jianeng; YANG Siyu; QIAN Yu

doi:10.11949/j.issn.0438-1157.20150791

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A novel integrated cascade absorption refrigeration technology by using waste heat in CTG's methanation process

更新时间：2025-12-10

- A novel integrated cascade absorption refrigeration technology by using waste heat in CTG's methanation process
- CIESC Journal Issue 3, Pages: 779-787(2016)
- 作者机构：
  
  华南理工大学化学与化工学院,广东,广州,510640
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150791
  CLC： K115
- Online First：12 January 2016，
  
  Published：12 January 2016
- 稿件说明：
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YANG Sheng, LIANG Jianeng, YANG Siyu, et al. A novel integrated cascade absorption refrigeration technology by using waste heat in CTG's methanation process[J]. CIESC Journal, 2016, (3): 779-787.
DOI：

YANG Sheng, LIANG Jianeng, YANG Siyu, et al. A novel integrated cascade absorption refrigeration technology by using waste heat in CTG's methanation process[J]. CIESC Journal, 2016, (3): 779-787. DOI： 10.11949/j.issn.0438-1157.20150791.

摘要

煤制气甲烷化过程中会产生大量的低温余热

这部分热量直接排放到大气

造成较大的能效损失、经济价值损失。将溴化锂吸收式制冷和氨吸收式制冷的串级制冷工艺集成到甲烷化过程中

利用低品位余热制冷

可制得-40℃的冷量用于低温甲醇洗

以替代部分常规的压缩式制冷。这样能大幅降低电耗

提高能效。以40亿立方米/年的煤制天然气为例

该串级吸收式制冷集成甲烷化过程中的低温余热用于低温甲醇洗单元供冷

减少压缩式制冷负荷16.2%

折合节省标煤1.8万吨/年

动态投资回收期1.7年左右。

Abstract

Methanation process in coal to synthetic natural gas (CTG) produces a large amount of waste heat. It will cause a huge loss of economic value and energy efficiency with this part of heat emitted into the atmosphere directly. LiBr absorption refrigeration and NH3 absorption refrigeration cascade refrigeration technology (CRT) is driven by waste heat from methanation process. CRT can produce-40℃ ammonia used in rectisol which can replace a part of compression refrigeration. Thus

it can reduce power consumption significantly and increase energy utilization efficiency. For example

CRT is integrated with methanation applied in a 4 billion m3·a-1 SNG plant. As a result

16.2% compression refrigeration load is substituted

equivalent to saving 18000 tons standard coal per year. The dynamic payback period is about 1.7 years.

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