Ammoxidation furnace formed by novel platinum net brace that is catalyst basket and support structure thereof

Abstract

The invention relates to an ammonia oxidation stove consisting of a novel platinum net bracket-based catalyst frame and a supporting structure thereof; a concrete vertical column is erected at the center of a pipe box in front of an oxidation furnace / waste boiler; furthermore, the upper end of the concrete vertical column supports a bracket which is provided with screens so as to form a CDM catalyst frame; the CDM catalyst is provided with a platinum net; the circumference of the bracket-based catalyst frame is heat-insulated by a ceramic fiber blanket; when the CDM catalyst is not loaded, the screen is canceled and the platinum net is directly arranged on the bracket. The ammonia oxidation stove has the advantages that the bracket is made of high-temperature alloy HP-Nb or HK-40 which generates no high-temperature oxidation even under a use state of high temperature; furthermore, the bracket has enough bending section modulus under the use temperature, has simple structure and smaller manufacture difficulty; furthermore, the ammonia oxidation stove completely meets the requirement of installation of the platinum net and the filling of a catalyst which is used for emission reduction of N2O for the newly increased CDM project, leads the platinum net and the catalyst to be the best condition of horizontal surface when in use, ensures the platinum net and the catalyst to achieve the normal design service life; the ammonia oxidation stove belongs to maintenance-free design, and reduces the shutdown maintenance time of the system, the maintenance expense and the heat dissipation loss of the oxidation stove.

Description

technical field [0001] The invention relates to an ammonia oxidation furnace composed of a novel platinum mesh bracket, a catalyst basket and its supporting structure. The bracket is used to support the catalyst of the ammonia oxidation reaction—platinum mesh, and is used as a CDM emission reduction N 2 The catalyst basket of O belongs to the field of component assembly design and manufacture in the ammonia oxidation furnace of the nitric acid plant. Background technique [0002] At present, in domestic and foreign atmospheric nitric acid production devices, the ammonia oxidation reaction temperature is controlled at 800-860 °C; the platinum mesh support structure in the ammonia oxidation furnace is firstly made of adjustable heat-resistant steel wire, and secondly is made of heat-resistant steel plate (Cr25Ni20 grade Or high-level Incoloy 800H) welding bracket. Although these two structures can maintain normal production at this high temperature, there are obvious problems...

AI Technical Summary

Problems solved by technology

2. Using bionics, the plane of the bracket is designed as a "spider web" shape, combined with the optimally designed cross-sectional shape, to maximize its own rigidity / anti-deformation ability, and to solve the problem of uncoordinated deformation in the background technology, and the welding structure often Problems of cracking and damage at the weld seam

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