Use of duplex stainless steel in an stripper of ammonia-stripping or self-stripping urea plants and method for revamping the urea plants

Use of duplex stainless steel in an stripper of ammonia-stripping or self-stripping urea plants and method for revamping the urea plants

  • CN 105,377,394 A
  • Filed: 05/05/2014
  • Published: 03/02/2016
  • Est. Priority Date: 05/10/2013
  • Status: Active Application
First Claim
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1. a shell-tube type stripper, for the ammonia stripping apparatus of urea synthesizing or the application in stripping apparatus, wherein said stripper comprises a shell and a beam tube, and be configured to by heating and as pipe described in stripping fluid, the carbamate solution of supply be provided to described pipe by ammonia alternatively, it is characterized in that, described pipe is made up of the one in following two phase stainless steel:

  • A) steel, i.e. 29Cr-6.5Ni-2Mo-N, it is also specified by ASME specification 2295-3 and UNSS32906, Or;

    B) DP28W tMsteel, i.e. 27Cr-7.6Ni-1Mo-2.3W-N, it is also specified by ASME specification example 2496-1 and UNSS32808.

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