Energy-saving continuous sulfur melting process without waste liquid discharge

Abstract

The invention discloses an energy-saving continuous sulfur melting process without waste liquid discharge, and belongs to the technical field of chemical processes. The process is carried out in a continuous sulfur melting tank, wherein at least one of sulfur paste, sulfur foam or sulfur slurry is mixed with the clear liquid discharged from the clear liquid outlet in the slurry tank to obtain a mixed slurry, and the mixed slurry is fed into In the heat exchange tubes of the kettle body, in the first heat exchange zone, the heat exchange is strengthened with the clear liquid passing through the baffle plate, and in the second heat exchange zone, the heat exchange is strengthened with the liquid passing through the damping plate to complete the slurry temperature rise process. The obtained heated slurry descends into the sulfur settling zone to separate the sulfur particles and liquid. The sulfur particles melt sulfur in the sulfur melting zone to obtain liquid sulfur and discharge it out of the kettle body. The liquid rises into the second heat exchange zone and is enriched under the action of damping baffles. Sulfur particles make the liquid become clear liquid and continue to rise into the first heat exchange zone, and then the clear liquid is recovered to the slurry tank or desulfurization system from the clear liquid outlet. The clear liquid obtained by the process method has a lower temperature, can be recycled for pulping, and is conducive to realizing a clean process without waste liquid discharge.

Description

technical field [0001] The invention relates to a process for refining sulfur, belonging to the technical field of chemical technology, in particular to an energy-saving continuous sulfur melting process method without waste liquid discharge. Background technique [0002] Wet desulfurization is widely used because of its low desulfurization cost and high desulfurization efficiency. The sulfur products obtained by wet desulfurization include sulfur foam, sulfur slurry or filtered sulfur paste. sulfur. In the early days, intermittent sulfur melting kettles were commonly used for sulfur melting, but due to the defects of poor on-site environment, low sulfur output, high energy consumption, and difficult operation and management, they have been replaced by continuous sulfur melting kettles. [0003] In recent years, people are constantly improving the defects of continuous sulfur melting kettle. The sulfur melting kettle that relies on jacket heating has the problem of imperme...

AI Technical Summary

Problems solved by technology

Due to the limited range of radiation heat transfer in the sulfur melting kettle with jacket heating, there is a problem that sulfur cannot be melted through. Chinese patents 2011202144038 and 2012203024911 propose to add coils and inner jacket heaters at the bottom of the kettle to solve the problem, so as to improve Sulfur melting effect, but the temperature of the clear liquid discharged from the sulfur melting kettle is relatively high, and a heat exchanger is required to continue cooling the clear liquid. The essence is to transfer the energy of the heating steam to the cooling medium for the clear liquid, wasting heat energy ; Chinese patents 2006201275407, 2011202144038, 2015204541285 and 2016207465095 all use tube heat exchange devices, but there are sulfur particles in the slurry deposited on the partition outside the tubes, resulting in low heat exchange efficiency, and steam heating the slurry also heats the connecting pipe and The clear liquid in the ascending pipe increases the steam consumption and uses cooling water to cool the clear liquid, so that the heat energy of the clear liquid is not fully utilized; Chinese patent 2013204131173 also uses tube heat exchange for heat exchange between slurry and clear liquid , but it controls the outlet temperature of the clear liquid between 80 and 90°C, and there is a problem that the heat energy of the clear liquid is not fully utilized

At the same time, the direct discharge of clear liquid may also cause environmental pollution

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