Evaporator and process for continuously producing 38-58% liquid calcium chloride

Abstract

An evaporator and its continuous production process of 38-58% calcium chloride liquid, the process flow is the use of forced circulation of steam with low enthalpy value and multi-effect evaporation in a special liquid feeding mode. The heating chamber is made of titanium or stainless steel. The U-shaped pipe of the upper circulation pipe is a variable diameter pipe. The outlet of the circulating liquid is drawn from the center of the separation chamber. In the upper part of the descending section, the liquid inlet of the separation chamber is 1.8-6.5m away from the demister, the volume below the liquid inlet is 55-95% of the system volume, and the finished liquid outlet is at the bottom of the separation chamber. The invention has the advantages of less investment, short process, simple operation and good energy-saving effect. Applicable to ammonia and alkali plants, salt chemical industry, paper making, etc. 4 In the scarring process.

Description

technical field [0001] The invention belongs to an inorganic salt chemical production process and its special equipment, in particular to an evaporator and its new process for continuously producing 38%-58% calcium chloride liquid. Background technique [0002] At present, the technological process of producing calcium chloride by using Solvay's alkali-making waste liquid is as follows: the ammonia distillation waste liquid is pumped into the clarifier tank, and the raw material solution containing about 8% to 11% of calcium chloride passes through the overflow pipe After entering the storage tank, the raw material liquid is pumped into the I-effect evaporator to be heated and concentrated to 15-20% and then sent to the II effect. In the II effect, it is evaporated to 32-39% under negative pressure and sent to the desalination system as the finished liquid. Finally, use III effect or IV effect (some use other types of evaporators) to evaporate to 38-58% calcium chloride. Ho...

AI Technical Summary

Problems solved by technology

Scarring will reduce heat transfer efficiency, increase energy consumption, and cannot be continuously produced. Generally, the evaporator can only run for 5 to 9 days, and the production efficiency is low.

The following three traditional solutions also have different shortcomings: ① Two evaporators are used, one for the other

This method needs to requisition or rent a large amount of land, so it has certain limitations, and when the beach is exposed to 27-33Be°, there are still a small amount of scale components in the brine, which will also affect the evaporation rate in the future.

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