A nitric acid oxidation furnace with greenhouse gas emission reduction effect

Abstract

The invention relates to a nitric acid oxidation furnace with a greenhouse gas emission reduction effect. The nitric acid oxidation furnace is characterized in that an N2O catalyst container with the height of 10cm is added in the oxidation furnace, the N2O catalyst container and the oxidation furnace are made of the same material, the diameter of the N2O catalyst container is 10-cm less than the inner diameter of the oxidation furnace, the bottom of the N2O catalyst container is provided with a wire mesh, and the N2O catalyst container is internally provided with a plurality of partitions vertical to the bottom of the N2O catalyst container; in addition, a high temperature resistant wire mesh is made into a plurality of metal wire small bags with the volume of 75 cubic meters, which can be bent, and catalyst particles are put in the metal wire small bags; and then the metal wire small bags are filled in the N2O catalyst container. The nitric acid oxidation furnace has a relatively good treatment effect on N2O and the advantages that the manual subpackaging is not needed, the loss of the catalyst is avoided, meanwhile, the emission reduction efficiency is improved, and the operating cost is not increased.

Description

technical field [0001] The invention relates to the technical field of reactor application, in particular to a novel nitric acid oxidation furnace with the effect of reducing greenhouse gas emissions. Background technique [0002] The raw materials for industrial production of nitric acid are mainly ammonia and air, which are produced by contact catalytic oxidation of ammonia. The overall reaction is of the formula: [0003] NH 3 +2O 2 =HNO 3 +H 2 o [0004] The first step in the nitric acid production process is to burn the mixture of gaseous ammonia and air on the platinum-rhodium alloy wire mesh in the oxidation furnace to generate high-temperature nitrogen oxide (NOX) gas at 860°C. The main reaction formula is as follows: [0005] 4NH 3 +5O 2 →4NO+6H 2 O(1) [0006] 4NH 3 +3O 2 →2N 2 +6H 2 O(2) [0007] 4NH 3 +4O 2 →2N 2 O+6H 2 O(3) [0008] The NO generated by formula (1) is the main product of this step and is used to produce nitric acid. Formulas (...

AI Technical Summary

Problems solved by technology

[0013] 1. The platinum-rhodium alloy wire mesh needs to be replaced every six months, and the oxidation furnace needs to be overhauled, so the N 2 O The catalyst is removed and reinstalled. In this process, the operator needs to stand on the catalyst and use tools to operate. During the operation, the catalyst will be damaged due to gravity extrusion and tool damage. On the one hand, the generated fines will enter with the airflow In the following process, on the other hand, it will cause catalyst loss, reduce emission reduction efficiency and shorten catalyst life

[0014] 2. After the oxidation furnace is started, 50000Nm 3 / h of process gas will change the N 2 The flatness of the O catalyst laying will cause the intermediate catalyst to transfer to the surrounding, resulting in the thickness of the intermediate catalyst being less than 10 cm and reducing the emission reduction rate