Apparatus for Processing Highly Corrosive Agents

Inactive Publication Date: 2007-10-11
CASALE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016] The technical problem underlying the present invention is therefore that of providing a tube bundle heat exchange apparatus of the type specified above, that allows the quoted drawbacks with reference to the prior art to be overcome

Problems solved by technology

Added to this, as well as such critical operative conditions, the process fluid often also exerts a corrosive and/or erosive action on the surfaces with which it comes into contact due, in particular, to the presence of highly corrosive agents.
These substances exert an aggressive consumption and erosion action of the inner surfaces of such tubes with which they come into contact.
It follows from this that such apparatuses are seriously damaged already after short periods of operation, in some cases even after a few months of activity.
This means having to shut down the whole urea production plant for their repair, but more frequently replacement with new apparatuses, with clear negative effects in terms of loss of production and maintenance costs.
Moreover, frequent stopping and restarting of the plant can cause damage to the other apparatuses or their r

Method used

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  • Apparatus for Processing Highly Corrosive Agents
  • Apparatus for Processing Highly Corrosive Agents

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Embodiment Construction

[0029] With reference to the aforementioned figures, the heat exchange apparatus according to the invention shall be described, purely for indicating and not limiting purposes, with specific reference to a descending film tube bundle heat exchanger 10, with vertical tubes, that has advantageous and specific use as a stripper of a urea production plant, but it is clear that it can be used as a condenser, evaporator, boiler, reactor or similar apparatuses based upon the heat exchange between two fluids.

[0030] In particular, the heat exchanger 10 according to the invention has advantageous and specific use as a stripper or condenser in a high pressure synthesis section of an urea plant, and more precisely of a urea plant of so-called CO2 or ammonia stripping, not represented because it is conventional. Such a section generally comprises at least one synthesis reactor, a stripper for the decomposition of the ammonium carbamate and of the-free ammonia present in the reaction mixture com...

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Abstract

An apparatus for treating highly corrosive agents comprises a tube bundle (14) heat exchanger (10), structured to carry out a heat exchange between two fluids one of which is highly corrosive and flowing inside of said tube bundle (14).

Description

FIELD OF APPLICATION [0001] The present invention, in its most general aspect, refers to apparatuses intended for treating highly corrosive chemical agents, with respect to which a specialized, effective and long-lasting protection is required. [0002] In particular, this invention concerns an apparatus of the aforementioned type, in which the treating of corrosive agents is substantially a heat-treating. [0003] Yet more specifically, the present invention refers to an apparatus of the type considered, comprising or essentially consisting of a tube bundle heat exchanger, structured to carry out a heat exchange between two fluids one of which is highly corrosive. [0004] Heat exchange apparatuses falling within the scope of protection of the present invention are, for example, synthesis, decomposition, condensation or evaporation reactors, stripping apparatuses, boilers, concentrators and similar devices that require the heat exchange between a process fluid and an operating fluid. [00...

Claims

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Application Information

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IPC IPC(8): F28F19/06C01B21/12C01C1/04F28F21/08
CPCF28F21/086F28F19/06B01J12/02B01J14/00F28D7/1623F28F2275/06
Inventor ROMITI, DOMENICO
Owner CASALE SA
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