Second stage evaporative separator

Abstract

The invention relates to an evaporation system and discloses a two-section evaporation separator which comprises a volute (1), wherein an entrainment separation zone (2) is arranged at the inner side wall of the volute (1), each end of the entrainment separation zone (2) forms a 40-180-degree included angle with the circle center of the volute (1); the entrainment separation zone (2) comprises fins; a first fixed plate (24) is arranged at the lower sides of the fins; a second fixed plate (25) is arranged at the upper sides of the fins; the fins are divided into first fin (21) and second fin (22); the included angles between the first fin (21) and the corresponding second fins (22) are the same; six liquid phase guide zones (3) are formed at the lower side of the volute (1); the liquid phase guide zones (3) are connected with the entrainment separation zone (2). The two-section evaporation separator is mainly divided into the entrainment separation zone and the liquid phase guide zones; by virtue of the entrainment separation zone provided with the fins, the urea entrainment amount in a gas phase can be effectively lowered and the generation of side reaction is thoroughly avoided; the liquid phase guide zones are mainly used for distributing urine, so that the urine can be uniformly distributed in the volute; by virtue of the liquid phase guide zones, the retention of the urine in the volute can be prevented, and thus the generation of a large amount of condensate is prevented.

Description

technical field [0001] The invention relates to an evaporation system, in particular to a second-stage evaporation separator. Background technique [0002] The task of the second-stage evaporative separator in the urea production system is to evaporate and separate about 5% of the internal water from about 95% of the urine from the first-stage evaporative separator after heating, so that the concentration reaches 99.5%. Above, then sent to the prilling tower for granulation. The current two-stage evaporative separator has the following problems: first, condensation products are easily produced above the internal mist separator, resulting in poor evaporation effect, resulting in high moisture content in the finished product, which affects product quality; second, the gas phase of the second-stage evaporative separator High urea entrainment. The amount of urea in the gas phase of the current separator is about 6% (weight ratio), and the 6% urea returns to the system for deco...

AI Technical Summary

Problems solved by technology

The current two-stage evaporative separator has the following problems: first, condensation products are easily generated above the internal mist separator, resulting in poor evaporation effect, resulting in high moisture content in the finished product, which affects product quality; second, the gas phase of the second-stage evaporative separator Entrained urea high

The amount of urea in the gas phase of the current separator is about 6% (weight ratio), and the 6% urea returns to the system for decomposition and synthesis, and then enters the evaporation system again, which wastes the decomposition steam and occupies the capacity of the synthesis, decomposition, and evaporation systems. Form a vicious circle and reduce production efficiency

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