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Energy-saving device and method for dissolving solid urea in production of melamine

A technology of melamine and dissolved solids, applied in chemical instruments and methods, melting, chemical/physical processes, etc., can solve problems such as large steam consumption and increase production costs, and achieve the effects of reducing production costs, maintaining material balance, and saving energy

Pending Publication Date: 2018-11-06
辛集市九元化工有限责任公司
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Problems solved by technology

[0003] The common practice is: to feed low-pressure steam of 0.35-0.4Mpa into the equipment tube side of the "urea melting tank", put solid urea into the shell side of the "urea melting tank", and the heat of the steam is transferred to the solid through the heat exchange tube. It is melted in urea, and the molten urea after melting is collected at the bottom of the "urea melting tank", and is transported to the liquid urine system of the melamine device by using a potential difference or a pump. Using this method to dissolve solid urea will consume a large amount of steam, which increases production costs

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  • Energy-saving device and method for dissolving solid urea in production of melamine

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Embodiment Construction

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0023] like figure 1 As shown, the present invention proposes an energy-saving device and method for dissolving solid urea in the production of melamine.

[0024] For the one-step melamine production process, the role of "liquid urine washing tower 2" is to cool and purify the 210°C high-temperature process gas from the finished product laying system with a small amount of melamine powder into the 140°C pure process gas required by the production process .

[002...

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Abstract

The invention belongs to the technical field of solid urea melting equipment, and provides an energy-saving device for dissolving solid urea in production of melamine. The energy-saving device comprises a urea melting tank and a liquid urine washing tower, wherein a middle sealing head is arranged in the liquid urine washing tower; a middle tower reactor is arranged on the middle sealing head in the liquid urine washing tower; a bottom tower reactor is arranged at a bottom end of the liquid urine washing tower; a liquid urine spraying head and a high temperature process gas inlet are formed ina top end of the liquid urine washing tower; the bottom tower reactor is connected with the urea melting tank, and is further communicated with the liquid urine spraying head by a liquid urine circulation pump; one side of the middle tower reactor is communicated with the bottom tower reactor by a gas-liquid separator; a molten urea lead-out pipeline is arranged on the middle sealing head; and the middle tower reactor is communicated with the urea melting tank by the molten urea lead-out pipeline. The energy-saving device and method provided by the invention solve technical problems that dissolution of solid urea consumes a large amount of steam and the production costs are increased.

Description

technical field [0001] The invention belongs to the technical field of solid urea melting equipment, and relates to an energy-saving device and method for dissolving solid urea in melamine production. Background technique [0002] For the one-step melamine production process without a supporting urea plant, dissolving the purchased solid urea into molten liquid urea is an essential link. [0003] The common practice is: to feed low-pressure steam of 0.35-0.4Mpa into the equipment tube side of the "urea melting tank", put solid urea into the shell side of the "urea melting tank", and transfer the heat of the steam to the solid through the heat exchange tube. It is melted in urea, and the molten urea after melting is collected at the bottom of the "urea melting tank", and is transported to the liquid urine system of the melamine device by using a potential difference or a pump. Using this method to dissolve solid urea will consume a large amount of The steam increases the pro...

Claims

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Application Information

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IPC IPC(8): B01J6/00
CPCB01J6/005
Inventor 何淼刘健郑鸿飞李可大马德义和会光
Owner 辛集市九元化工有限责任公司
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