Process for improving tar quality

Abstract

The invention relates to a process for improving tar quality. The process comprises the following steps of arranging a dosing port in the top part of a slag scraping tank, injecting a demulsifying agent into the dosing port from a dosing barrel through a first dosing pipe and a quantitative dosing pump, and realizing primary separation of ammonia liquor from tar; then feeding slag-removed ammonia liquor and tar into a separating tank from the slag scraping tank so as to carry out secondary separation; arranging two paths of outlets on a side wall part above a separating cylinder of the separating tank, wherein one path of outlet is used for outputting ammonia liquor obtained after separation of ammonia liquor from tar, and the other path of outlet is respectively communicated with an anammonia liquor and tar inlet of the separating tank and an inlet of a tar and ammonia liquor separator; standing for separating an ammonia liquor and tar mixture entering the tar and ammonia liquor separator, and recycling after collecting tar separated in the tar and ammonia liquor separator and tar discharged by a screw augur of the separating tank. According to the process for improving tar quality provided by the invention, continuous dosing is carried out in the separating tank, and the combined application of primary separation and second separation is utilized, so that the ammonia liquor and tar emulsification degree can be effectively controlled, and the separation efficiency of the tar and the ammonia liquor is speeded up.

Description

technical field [0001] The invention relates to a method for recovering tar, which belongs to the field of coal coking production and recovery, and in particular relates to a process for improving the quality of tar. Background technique [0002] In the recovery process of coal coking by-products, the coke oven gas is first sent to the benzene washing tower, and the benzene substances are recovered by washing oil, and then the gas is passed through the sprayed ammonia water to realize the recovery of tar and the removal of harmful substances to recover Useful substances and removal of harmful substances to prevent environmental pollution. [0003] The existing tar recovery process is generally to send the tar and ammonia water mixture separated from the gas-liquid separator into the slag scraping tank to remove the tar residue, and then pass through the tar ammonia water separator to statically separate the ammonia water tar mixture. The fusion of tar and ammonia water is a...

AI Technical Summary

Problems solved by technology

Simply adding a demulsifier to the tar ammonia water separator can reduce the emulsification degree of the tar, but the effect is limited. It will increase the standing time of the tar and ammonia water, and it cannot be processed quickly and efficiently, thus affecting the water content of the tar and the tar content. Naphthalene recovery