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Method for concentrating thin urine using falling film type evaporation heater

A heater and falling film technology, applied in the field of concentration, can solve problems such as unfavorable energy saving, and achieve the effects of independent working conditions, significant energy saving effect, and significant promotion significance.

Active Publication Date: 2007-06-20
SICHUAN LUTIANHUA
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Problems solved by technology

The urea plant with a daily output of 2,700 tons of other domestic companies also uses a rising-film urine pre-concentration system with temperature-adjusted water as a heat source. The rising-film evaporation must have a high vacuum condition to obtain a low-density high-speed airflow, thereby ensuring The liquid film flow state in the pipe, therefore, the setting of the jet pump is indispensable, which is not conducive to energy saving

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  • Method for concentrating thin urine using falling film type evaporation heater

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention will be further described: As shown in Figure 1, this embodiment is applied to daily production of 1620 tons of CO 2 The process flow of the stripping urea plant, from the circulation system, the urine with a concentration of about 72% and a temperature of 95°C enters the first chamber of the urine storage tank, and is transported to the annular liquid inlet chamber at the lower part of the separator through a urine pump. Urine flow control is achieved by a manual regulator set on the outlet line. The urine, which is pre-divided by the bidirectional symmetrical liquid inlet method, descends to the upper tube plate of the heater along the periphery of the separator wall. At this position, an intercalated distributor is installed on the top of each tube. The four tangential holes distribute the urine to each tube of the evaporation heater, and form a liquid film on the inner wall of the tube, and the wa...

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Abstract

The present invention discloses method of concentrating thin urea liquid with falling film type evaporation heater. In the urea producing apparatus on CO2 vaporizing extract process, the falling film type evaporation heater is set behind circulation section and before the evaporation section, and urea liquid through the liquid distributor flows along the inner walls of the tube array from up to down to evaporate partial water and raise concentration, with the vacuum condition of the pre-concentration system being maintained with the surface condenser and the first section evaporation jetting pump. The present invention has the advantages of eliminating bottle neck in the evaporation system, independent and stable evaporation condition, and utilization of afterheat of the high pressure washer to save energy.

Description

Technical field [0001] The invention relates to a concentration method, in particular to a method for concentrating dilute urine by using a falling film evaporation heater. technical background [0002] In the process of evaporating and concentrating urine, when the temperature of the urine is close to or higher than the melting point of urea (132.6°C), some side reactions will occur, mainly isomerization condensation reaction, hydrolysis reaction and decomposition reaction of urea. The existence of these side reactions will lead to a reduction in urea production rate or an increase in steam consumption; it will also affect the quality of urea products. [0003] 1) Generation of a side reaction biuret [0004] The main products of the condensation reaction of urea are biuret, cyanuric acid, melamine, etc. Under the operating conditions in the urea evaporation process, the main reaction is the formation of biuret. According to relevant studies, biuret can be generated not ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C273/16B01D1/00
Inventor 周寅仪茅启昌刘勇李勇
Owner SICHUAN LUTIANHUA
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