Title:
DEVICE AND METHOD FOR SUPPRESSING CREATION OF HIGH-MELTING POINT PIPING BLOCK SUBSTANCE
Document Type and Number:
Japanese Patent JP2023024849
Kind Code:
A
Abstract:
To provide a device and a method for suppressing creation of a high-melting point piping block substance by promoting hydrolysis of an isocyanic acid and a cyanic acid and reducing a creation amount of a cyanuric acid.SOLUTION: A device for suppressing creation of a high-melting point piping block substance is configured so that a urea water supply pipe 6 for supplying pressurized air and urea water is inserted into piping in which an exhaust gas flows, a urea water spray nozzle 7 is connected to the vicinity of a tip of the urea water supply pipe 6, a mixing part 8 in which the exhaust gas flowing in the piping and spray urea water sprayed from the urea water spray nozzle 7 are mixed is provided, a metal sheet 9 is circumferentially arranged in a band shape entirely or partially at an inner wall face of the piping at a circumference of the mixing part 8, an ammonia is created by promoting hydrolysis of an isocyanic acid (HN=C=O) and a cyanic acid (HOCN) by making the sprayed urea water contact an inner face of the metal sheet 9, a hydrolytic catalyst layer 10 for reducing a creation amount of the cyanuric acid is formed, and a hydrolytic catalyst of the hydrolytic catalyst layer 10 is an Al2O3 catalyst, or an aluminum silicate oxide.SELECTED DRAWING: Figure 1
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Inventors:
Inaba Toshiharu
Nozomi Hattori
Nozomi Hattori
Application Number:
JP2022186696A
Publication Date:
February 17, 2023
Filing Date:
November 22, 2022
Export Citation:
Assignee:
Mitsui e&s machinery Co., Ltd.
International Classes:
F01N3/08; B01D53/94; B01J21/06; F01N3/10; F01N3/28
Attorney, Agent or Firm:
Maruyama Eiichi
Shigeki Maruyama
Tomoki Maruyama
Shigeki Maruyama
Tomoki Maruyama
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