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

A technology of catalytic oxidation and oven method, applied in chemical instruments and methods, carbon monoxide, inorganic chemistry, etc., can solve the problems of reduced oxidation furnace efficiency, difficult temperature control, easy to generate stress, etc., to achieve controllable heating curve and avoid cracking , the effect of reducing the fluctuation range of temperature rise

Active Publication Date: 2015-06-10
WUHAN KAIDI ENG TECH RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0033] First, feed N into the natural gas catalytic oxidation furnace that has been dried and filled with precious metal catalysts. 2 , natural gas and oxygen, wherein, the natural gas contains >99.9% methane, and the natural gas flow rate is 1 kmol / h; the oxygen purity is >99.9%, and the oxygen flow rate is 0.6 kmol / h; the nitrogen gas purity is >99.9%, and the nitrogen gas flow rate is 7 kmol / h; , preheat the mixture formed by the above-mentioned nitrogen, natural gas and oxygen, and gradually increase the temperature of the mixture until it is heated to 300°C to trigger the catalytic oxidation reaction, then stop the preheating and gradually reduce the flow rate of the mixed nitrogen until the nitrogen The flow rate is reduced to 0, so that the reaction temperature rises at a heating rate that meets the requirements of the oven curve of the adiabatic refractory material in the natural gas catalytic oxidation furnace, and smoothly transitions to the normal operating condition...

Embodiment 2

[0036] First, feed He, natural gas and oxygen into the natural gas catalytic oxidation furnace that has been dried and filled with precious metal catalysts, wherein the natural gas contains >99.9% methane, and the flow rate of natural gas is 1 kmol / h; the purity of oxygen is >99.9%, and the flow rate of oxygen 0.3kmol / h; the He purity is >99.9%, and the He flow rate is 7kmol / h; then, preheat the mixed gas made of the above-mentioned He, natural gas and oxygen, and gradually increase the temperature of the mixed gas until it is heated to 550 After the catalytic oxidation reaction is triggered at ℃, stop preheating and gradually reduce the mixed He flow rate until the He flow rate drops to 0, so that the reaction temperature rises at a heating rate that meets the requirements of the oven curve of the insulating refractory material in the natural gas catalytic oxidation furnace. Transition to the normal operating condition of 760°C, the oven curve of the insulating refractory mate...

Embodiment 3

[0039] First, feed CO into the natural gas catalytic oxidation furnace that has been dried and filled with precious metal catalysts. 2 , natural gas and oxygen, wherein, natural gas contains >99.9% methane, and the flow rate of natural gas is 1 kmol / h; the purity of oxygen is >99.9%, and the flow rate of oxygen is 0.4 kmol / h; CO 2 >99.9% pure, CO 2 The flow rate is 7kmol / h; then, for the above CO 2 , the mixture of natural gas and oxygen is preheated, and the temperature of the mixture is gradually increased until it is heated to 600°C to trigger the catalytic oxidation reaction, then the preheating is stopped and the mixed CO is gradually reduced. 2 flow, until CO 2 The flow rate is reduced to 0, so that the reaction temperature rises at a heating rate that meets the requirements of the oven curve of the adiabatic refractory material in the natural gas catalytic oxidation furnace, and smoothly transitions to the normal operating condition of 760 ° C. The oven of the adiabat...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/38C01B31/18C01B32/40
CPCC01B32/40C01B3/386C01B2203/1614C01B2203/169C01B2203/0261C01B2203/1241C01B3/36C01B3/38C01B2203/1623C01B3/40C01B2203/1017C01B2203/1082
Inventor 陈义龙张岩丰蒯平宇田文堂王大祥
Owner WUHAN KAIDI ENG TECH RES INST CO LTD
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