Method for catalytic-oxidation purification and energy utilization of low-calorific-value industrial exhaust gas and device

Abstract

The invention relates to a method for complete catalytic-oxidation purification and heat utilization of low-calorific-value industrial exhaust gas and a device. The device consists of an air compressor, a heat exchanger, a startup heater, a multistage-structure catalytic reactor, a catalyst, a dedusting purifier, an exhaust-heat boiler, heat utilization equipment, an assorted static mixer and detection and control components and parts. The low-calorific-value and low-concentration industrial exhaust gas is mixed with compressed air, then, the mixture enters the multistage-structure catalytic reactor, repeated catalytic-oxidation reactions are carried out through the catalytic action of the catalyst to purify the mixture, and heat and energy recovery is separately carried out according to differences of heat and exhaust gas pressures generated by the oxidation reactions. The low-calorific-value and low-concentration industrial exhaust gas is subjected to catalytic oxidation purification completely and then is exhausted into the atmosphere. According to the method and the device, the problems in the purification and heat utilization of the low-calorific-value and low-concentration industrial exhaust gas are effectively solved, the industrial exhaust gas can be discharged in an environment-friendly manner after reaching standards, the efficient utilization of low-grade resources is achieved, and thus, good harvests in both environmental protection and economy are finally achieved.

Description

technical field [0001] The invention belongs to the fields of environmental protection and utilization of low-grade resources. The industrial tail gas with low calorific value (contains combustible components, but the concentration is low, generally less than 15%) is discharged after complete catalytic oxidation and purification, and its energy is fully recycled to achieve the purpose of emission reduction and energy saving. Background technique [0002] For industrial tail gas with high calorific value and high concentration, it can be reused after being pressurized and returned to the system, or used as raw material for other chemical industries, or used directly as fuel. [0003] However, for low calorific value and low concentration industrial tail gas, it is of little significance to pressurize and reuse it or use it as a raw material. And because of its low calorific value, it cannot be ignited directly or although it can be ignited directly, it cannot achieve stable ...

AI Technical Summary

Problems solved by technology

As disclosed in CN102974216A "Carbon Catalytic Reduction Treatment Method for Nitrous Oxide in Industrial Tail Gas" and "A Continuous Dearsenic Carbonization Agent and Preparation Method for Industrial Tail Gas Purification" disclosed in CN104624223A, still fail to solve the problem of low calorific value, Catalytic Purification and Energy Utilization of Low Concentration Industrial Exhaust Gas

In addition, the catalytic purification method is used to treat low calorific value and low concentration industrial exhaust gas. The granular catalyst in the prior art is not resistant to wear, has a short life (only about 3 years), high resistance, and low space velocity (5000h -1 Within), the catalyst is under the condition of anoxic condition, and the carbon deposition problem shortens the life of the catalyst, and the catalyst regeneration process to deal with the carbon deposition problem complicates the catalytic combustion process, increases the investment, and the adaptability of the catalyst is relatively weak, and the tail gas The combustible components in it cannot be effectively oxidized

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