Tube furnace ammonia distilling process

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.

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...

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Problems solved by technology

This process needs to consume a large amount of steam, and the treatment cost remains high. Moreover, the process is greatly restricted by direct steam. Many manufacturers have the problem that the direct steam pressure and stability are not guaranteed. In addition, the fixed ammonium salt in the wastewater cannot be directly steamed. Evaporated, the efficiency of the ammonia distillation process is not high, and the problem of excessive ammonia content in the discharged waste ammonia water often occurs, which seriously affects the subsequent biochemical treatment

[0006] On the other hand, coke oven gas, blast furnace gas and other combustible gases are common in coking and iron and steel industries. Many manufacturers directly use torches to disperse them, resulting in waste of resources and environmental pollution.

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