Online baking method for heat insulation type natural gas catalytic oxidation furnace

Abstract

The invention discloses an online baking method for a heat insulation type natural gas catalytic oxidation furnace. The method comprises the steps of 1, injecting oxygen, natural gas and temperature control gas capable of reducing reaction temperature rising rate into the natural gas catalytic oxidation furnace at the same time, wherein the mole ratio of oxygen to natural gas is controlled to be 0.3-0.6 to 1, and the mole ratio of the temperature control gas to feed gas composed of oxygen and natural gas is controlled to be 0.1-7 to 1.3-1.6; 2, preheating the mixed gas to increase temperature gradually to oxidizing reaction triggering temperature; 3, reducing the mole ratio of temperature control gas to feed gas gradually to enable reaction temperature to rise according to the temperature rising rate required by a designed furnace baking curve, and stopping injection of temperature control gas when reaction temperature reaches working temperature. The method solves the problem that temperature rises too quickly during furnace baking, the situation that a heat insulation and refractory material cracks under shock heating is avoided, the natural gas catalytic oxidation furnace is protected, and the natural gas catalytic oxidation furnace can change to the normal operating state stably.

Description

technical field [0001] The invention relates to a catalytic oxidation furnace treatment technology, in particular to an on-line drying method for an adiabatic natural gas catalytic oxidation furnace. Background technique [0002] With the reduction of proven oil reserves and the gradual depletion of exploitable resources, the technology of using coal, natural gas and biomass as raw materials to produce liquid vehicle fuel through indirect conversion is gradually promoted, such as: coal-to-oil technology in South Africa, Malaysia And Qatar's gas-to-oil technology, Shenhua's coal-to-oil technology, etc. With the successful development and large-scale industrial application of shale gas extraction technology, the increase in natural gas production is changing the structure of mineral energy and bringing broad prospects for the comprehensive utilization of natural gas. The comprehensive utilization of natural gas is by first converting it into an intermediate product—synthesis ...

AI Technical Summary

Problems solved by technology

However, as the temperature of the raw material gas entering the adiabatic natural gas catalytic oxidation furnace rises, when the temperature reaches the ignition point of the reaction on the catalyst, the catalytic oxidation reaction will start instantly, and the temperature rises rapidly, making the temperature of the reaction gas instantly reach 800 ° C or even Higher, making it difficult to control the temperature in the adiabatic natural gas catalytic oxidation furnace during the heating stage, and the insulating refractory lining in the adiabatic natural gas catalytic oxidation furnace is usually a brittle material, which is prone to stress when encountering such a severe temperature rise , and then produce cracks, resulting in reduced efficiency or even failure of the oxidation furnace

[0008] At present, the research on catalytic oxidation of natural gas mainly focuses on the screening and preparation of catalysts, such as: US Patent US6946114B2 reports the formulation and reaction performance of catalysts for catalytic oxidation of natural gas, and how to effectively control the temperature in the catalytic oxidation furnace of natural gas, So as to protect the natural gas catalytic oxidation furnace so that it can smoothly transition to the normal operation state, it is still a technical blank

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