Tube furnace ammonia distilling process

A kind of tube furnace, technology of process

CN102086038AInactive Publication Date: 2011-06-08上海同特化工科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-06-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a novel ammonia distilling process and relates to a method for combining tube furnace heating with direct steam heating and strengthening ammonia distilling effect by directly adding alkali in the ammonia distilling process. Redundant coke oven gas, blast-furnace gas in steel works and other recyclable combustible gases are taken as fuels, and the method comprises the following steps of: performing tube furnace heating on circulating waste ammonia water at the bottom of a tower to a certain temperature, introducing the ammonia water into an ammonia distilling tower, replacing or partially replacing direct steam, and providing a heat source for distilling ammonia water on the top of the tower for an alkali reaction; directly adding quantitative alkali into the tower according to fixed ammonium salt content, reacting, decomposing the fixed ammonium salt in the ammonia water on the top of the tower, separating the fixed ammonium salt and free ammonia, condensing on the top of the tower to obtain stronger ammonia water, pumping a part of purified waste ammonia water into a tube furnace for heating and circulating by employing a pump, and delivering the other part of waste ammonia water to a wastewater biochemical treatment station.
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Description

technical field

[0001] The invention relates to the field of coking production, in particular to a method of using surplus coke oven gas, steel plant blast furnace gas, and other flammable gases as fuels, using combined use of tube furnace heating and direct steam heating, and direct addition of alkali for strengthening A new ammonia distillation process with ammonia distillation effect. Background technique

[0002] The ammonia distillation system is an important part of the coking production system. On the one hand, it meets the needs of environmental protection. The remaining ammonia water has complex components, and the concentration of ammonia nitrogen and COD is high. If the biochemical treatment is carried out directly, the microorganisms will not be able to withstand it, which is a huge impact on the environment. On the other hand, it provides the necessary raw materials for the production of ammonium sulfate, and the ammonia distillation system provides ammonia vapo...

Examples

Embodiment Construction

[0015] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments. These examples should be understood as only for illustrating the present invention but not for limiting the protection scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent changes and modifications also fall within the scope defined by the claims of the present invention.

[0016] Ammonia distillation system transformation of 25T / h ammonia water treatment capacity of Shanxi Metallurgical Coking Chemical Co., Ltd. The plant originally had a 25T / h ammonia distillation system, such as figure 1 As shown, a set of tubular furnaces is added to the ammonia distillation system, and a gas delivery system is added to connect the surplus coke oven gas of the plant. Specific steps are as follows:

[0017] 1. T...