Ammonia distillation method for waste heat of coke-oven flue gas

Abstract

The invention discloses an ammonia distillation method for waste heat of coke-oven flue gas and equipment, and belongs to the technical field of ammonia distillation process secondary heating methods and used devices; for solving technical problems, the invention provides the method and the equipment which can effectively use waste heat of coke oven flue gas and meanwhile can reduce waste water discharge amount during an ammonia distillation process; the invention adopts the technical scheme as follows: the ammonia distillation method for waste heat of coke-oven flue gas is carried out according to the following steps: firstly, injecting water, secondly, depositing solid impurities, thirdly, exchanging heat, fourthly, carrying out vapor-liquid separation, and then repeating the steps from the first to the fourth; a reboiler used in the ammonia distillation method for waste heat of coke-oven flue gas comprises an upper casing, a lower casing, an upper pipe plate, a lower pipe plate, a circulation downcomer and a plurality of evaporating pipes; and the upper pipe plate and the upper casing form a vapor-liquid separating chamber, and the lower pipe plate and the lower casing form a water settlement chamber. Due to the invention, amounts of soft water and energy are saved, and the quantity of wastewater discharge is reduced.

Description

technical field [0001] The invention relates to a method for steaming ammonia from waste heat of coke oven flue gas, which belongs to the technical field of secondary heating methods for steaming ammonia and devices used therefor. Background technique [0002] Ammonia distillation is to use steam to steam the ammonia in the raw ammonia water, so that the ammonia content in the treated ammonia water is lower to facilitate the operation of the biochemical device, and at the same time, a higher concentration of ammonia vapor is obtained. The ammonia distillation process is divided into direct ammonia distillation process and indirect ammonia distillation process. The heat transfer between the external water vapor and the waste water falling in the ammonia distillation tower is called direct ammonia distillation process. Water vapor or other heat medium transfers heat to ammonia distillation wastewater through the pipe wall, which is called indirect ammonia distillation process...

AI Technical Summary

Problems solved by technology

[0004] Gas tube furnace heating ammonia distillation wastewater process and heat conduction oil heating ammonia distillation wastewater process both use gas heating to indirectly heat ammonia distillation wastewater, which will consume a lot of energy

[0005] In the steam heating wastewater process, the heating reboiler needs to use soft water to generate heating steam, which requires a large amount of soft water, and also needs to use gas for vaporization, which will consume a lot of energy and also need to use a lot of water

At the same time, the flue gas produced in the coke oven is usually discharged out of the chimney without treatment, resulting in a large waste of flue gas heat

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