Process of removing sulfur and ammonia from coke gas to prepare ammonia water

A coke oven gas and ammonia water technology, applied in the chemical industry, can solve problems such as high production management requirements, low sulfur purity, and poor ammonia purification effect, and achieve the effects of reducing waste water discharge, saving steam consumption, and reducing environmental protection pressure

CN106673014AActive Publication Date: 2017-05-17TIANJIN CHUANGJU TECHNOLGOY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-05-17

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Abstract

The invention discloses a process of removing sulfur and ammonia from coke gas to prepare ammonia water. On the basis of existing AS methods, ammonia in the coke gas serves as an alkali source, ammonia water containing solution serves as a medium, the ammonia and hydrogen sulfide in the coke gas are removed by cyclic ammonia / sulfur absorption, desulphurizing, ammonia-washing rich solution pressurization, deabsorption and regeneration process, and meanwhile the remaining ammonia water is processed by a low-pressure ammonia distilling tower which takes remaining heat of a system as a heat source, and 5-20% of ammonia water is byproduct in the process. The process comprises an ammonia and hydrogen sulfide absorption part, an ammonia and hydrogen deabsorption part and remaining ammonia water based ammonia distilling part. Clean gas produced by the process can meet requirements of Admittance Standard of Coking Industry, and the process disclosed by the invention has the advantages of short process flow, low operation cost, good resource utilization and good environmental protection effect.
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Description

technical field

[0001] The invention belongs to the technical field of chemical industry, in particular to a process for preparing ammonia water through desulfurization and deammonification of coke oven gas. Background technique

[0002] At present, domestic coke oven gas desulfurization and deammoniation mainly include the ammonia-sulfur cycle washing method using ammonia as the alkali source (i.e. the AS method) and the wet oxidation method using ammonia as the alkali source (i.e. the HPF method). The reference is: Luan Zhenyu.AS Ammonia desulfurization process and operation by method [J]. Hebei Chemical Industry, 2010, 33(5): 59-60; Wang Jianhua, Li Shuai. Analysis and improvement of AS method gas desulfurization process [J]. Fuel and Chemical Industry, 2008, 39 (4): 49-50; Cui Xiaojun, Li Guang. Application and improvement of HPF desulfurization process [J]. Fuel and Chemical Industry, 2007, 38(3): 53-55; Dong Yanjun, Xu Daoliang, Zheng Xianyong. Coke oven gas HPF Impro...

Examples

Embodiment Construction

[0017] Specific examples of the present invention are given below. The specific embodiments are only used to further describe the present invention in detail, and do not limit the protection scope of the claims of the present application.

[0018] The invention provides a process for preparing ammonia water by desulfurization and deammonification of coke oven gas (see figure 1 ), characterized in that the process comprises the following steps:

[0019] (1) Absorption part of ammonia and hydrogen sulfide: the main equipment of the absorption part includes absorption tower, supporting heat exchanger, storage tank, etc. The absorption tower is composed of desulfurization section, ammonia washing section and alkali washing section from bottom to top. The temperature is 22~25℃, the ammonia content is 6~8g / Nm 3 , hydrogen sulfide content is 6 ~ 8g / Nm 3 The coke oven gas first enters the desulfurization section in the lower part of the absorption tower, and all or part of the amm...