Research on centralized sulfur resource recovery from waste sulfuric acid and acid gas

Petroleum Refinery Engineering ›› 2025, Vol. 55 ›› Issue (1): 24-28.

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Research on centralized sulfur resource recovery from waste sulfuric acid and acid gas

Hu Jia

SINOPEC Nanjing Engineering Co., Ltd., Nanjing, Jiangsu 210046

Received:2024-08-11 Online:2025-01-16 Published:2025-02-08

废硫酸和酸性气中硫资源集中回收方案研究

胡佳

中国石化南京工程有限公司，江苏省南京市 210046

作者简介:胡佳，高级工程师，硕士研究生，2010年毕业于大连理工大学化学工程与技术专业，主要研究方向为硫资源处理制硫酸。联系电话：13621587972，E-mail：279790007@qq.com。

Abstract

Abstract:

In order to thoroughly treat the waste sulfuric acid and hydrogen sulfide-containing acidic gas generated by refining enterprises, a dry acid production process scheme using waste sulfuric acid and hydrogen sulfide-containing acidic gas as feedstock has been proposed. The waste acid is cracked and regenerated at high temperatures, and part of the acid gas is incinerated to provide heat for the cracking of the waste acid. The excess acid gas is treated using a wet acid production process. In this scheme, air preheating can reduce the amount of fuel required for waste acid cracking and the amount of dilute acid discharged from the purification process. The integrated process of desulfurization and denitrification with hydrogen peroxide is simple, with low investment, no external wastewater discharge, and meets the emission requirements (the mass concentration of SO₂ is not greater than 30 mg/m³, the mass concentration of sulfuric acid mist is not greater than 5 mg/m³, and the mass concentration of NOₓ is not greater than 50 mg/m³). It is optimal to install a selective catalytic reduction (SCR) denitrification unit before the converter, which can prevent NOₓ from transferring to the product acid and affecting its quality. This scheme runs stably and can maximize the recovery of heat, making it an excellent centralized sulfur resource recovery solution.

Key words: waste sulfuric acid, acid gas, sulfur resource, sulfuric acid by dry process, air preheating, hydrogen peroxide, desulfurization and denitrification, SCR

摘要：

某炼化企业为了彻底处理产生的废硫酸和含硫化氢酸性气，提出了以废硫酸和含硫化氢酸性气为原料的废酸裂解干法制酸工艺方案。废酸在高温下裂解再生，焚烧部分酸性气为废酸裂解提供热量，多余的酸性气采用湿法制酸工艺处理。在废酸裂解干法制酸方案中：空气预热可以减少废酸裂解所需燃料量及净化工序外排稀酸量；双氧水脱硫脱硝一体化工艺流程简单，投资低，无外排废水，满足超低排放要求（SO₂质量浓度不大于30 mg/m³，硫酸雾质量浓度不大于5 mg/m³，NOₓ质量浓度不大于50 mg/m³）；在转化器前设置选择性催化还原（SCR）脱硝单元是最优的，可避免NOₓ转移到产品酸中从而影响产品酸质量。该方案运行稳定，可最大化回收热量，是很好的硫资源集中回收方案。

关键词: 废硫酸, 酸性气, 硫资源, 干法制酸, 空气预热, 双氧水, 脱硫脱硝, SCR

Hu Jia. Research on centralized sulfur resource recovery from waste sulfuric acid and acid gas[J]. Petroleum Refinery Engineering, 2025, 55(1): 24-28.

胡佳. 废硫酸和酸性气中硫资源集中回收方案研究[J]. 炼油技术与工程, 2025, 55(1): 24-28.

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Research on centralized sulfur resource recovery from waste sulfuric acid and acid gas

废硫酸和酸性气中硫资源集中回收方案研究

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