Claus process H2S acid gas catalytic combustion method

A catalytic combustion and acid gas technology, applied in the direction of combustion methods, combustion types, incinerators, etc., can solve problems such as safety hazards, increased side reactions, corrosion, etc., and achieve reduced equipment investment and operating costs, low requirements for device materials, Simple and safe operation

Active Publication Date: 2019-01-01
SHANDONG SUNWAY PETROCHEMICAL ENGINEERING CO LTD
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Problems solved by technology

Ammonia will react with various acidic components in the process gas stream to form ammonium salts, which will form various solid ammonium salt deposits at low temperature parts of the device, increasing the pressure drop of the system, and will block downstream equipment in severe cases
Moreover, ammonia can also cause an increase in the corresponding side reactions of the Claus reaction, reducing the conversion rate and recovery rate of sulfur
In the actual production process, there are also certain problems in the sulfur furnace, mainly: (1) to ensure that the NH 3 The temperature of the sulfur furnace must be maintained above 1200°C. Due to the high reaction temperature, the requirements for the material of the equipment are strict, and there are also great potential safety hazards; (2) In order to ensure the m

Method used

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  • Claus process H2S acid gas catalytic combustion method
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  • Claus process H2S acid gas catalytic combustion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Hexaaluminate composite oxides substituted by different elements (LaB y al 12-y o 19 , B=Mn, Fe, Cu, Co, Zn, Ni) NH on the catalytic material 3 Activity tests for selective catalytic oxidation reactions.

[0028] The preparation method of the hexaaluminate composite oxide catalytic material is described in the patent CN1680020A. NH using a fixed bed reactor 3 For the activity test of selective catalytic oxidation reaction, LaB with a mass of 0.3g and a particle size of 40-60 mesh y al 12-y o 19 The catalyst is placed in a fixed bed reaction tube. Use a mass flow meter to control the flow of the reaction gas, where NH 3 The concentration is 10000ppm; O 2 / NH 3 =0.75; airspeed is 24000h -1 . The gas composition and concentration after the reaction use MultiGas TM 2030 infrared continuous gas analyzer for detection. Catalyst activity in this reaction is controlled by NH 3 conversion rate and N 2 selectivity to represent. in:

[0029] NH 3 The conversion ...

Embodiment 2

[0033] LaCuAl 11 o 19 Hydrocarbons (CH 4 The activity test of the catalytic oxidation reaction.

[0034] CH using a laboratory fixed-bed reactor 4 For the activity test of the catalytic oxidation reaction, the quality is 0.5g, and the particle size is 20-40 mesh LaCuAl 11 o 19 The catalyst is placed in a fixed bed reaction tube. Use a mass flow meter to control the flow rate of the reaction gas, where CH 4 The concentration is 10000ppm; O 2 / CH 4 =2; Airspeed is 24000h -1 . Gas components and concentrations before and after the reaction were detected using gas chromatography. Catalyst activity in this reaction passes through CH 4 The conversion rate is represented. in:

[0035] CH 4 The conversion ratio = (CH in the inlet gas 4 Concentration of gas - residual CH in the outlet gas 4 Concentration of gas) / CH in inlet gas 4 Gas concentration*100%

[0036] image 3 LaCuAl 11 o 19 CH on the catalytic material 4 The conversion rate curve of the catalytic oxidat...

Embodiment 3

[0038] LaCuAl 11 o 19 H on hexaaluminate catalytic materials 2 S, NH 3 and CH 4 Activity test of catalytic oxidation reaction of mixed gas.

[0039] Using a fixed bed reactor for H 2 S, NH 3 and CH 4 For the activity test of the catalytic oxidation reaction of mixed gas, LaCuAl with a mass of 0.3g and a particle size of 40-60 mesh 11 o 19 The catalyst is placed in a fixed bed reaction tube. Use a mass flow meter to control the flow rate of the reaction gas, where H 2 S, NH 3 and CH 4 The concentration is 10000ppm; oxygen is introduced according to the metering ratio; the space velocity is 24000h -1 . Catalyst activity in this reaction is controlled by H 2 S conversion rate and SO 2 Generated to represent. in:

[0040] h 2 The conversion ratio of S=(H in the inlet gas 2 Concentration of S gas - remaining H in the outlet gas 2 Concentration of S gas) / H in the inlet gas 2 Concentration of S gas*100%

[0041] SO 2 The yield of = SO in the outlet gas 2 Forma...

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Abstract

The invention relates to a Claus process H2S acid gas catalytic combustion method, and belongs to the technical field of sulfur resource recovery. The catalytic combustion method comprises the following steps that firstly, H2S raw material gas and air with a certain proportion through a premixing system to realize gas mixing; then the mixed gas passes through a hexaaluminate composite oxide catalytic bed layer maintained in a specific temperature range, under the action of the catalyst, H2S is oxidized into SO2 according to the designed amount, NH3 is efficiently catalytically decomposed intoN2, and the hydrocarbon is catalytically oxidized into CO2; and the purification gas of the catalytic bed layer enters a subsequent process to generate a Claus reaction. According to the Claus processH2S acid gas catalytic combustion method, a catalytic combustion method is adopted, ignition and flame burning are not needed, the combustion temperature, the equipment investment and the operation cost can be effectively reduced, and the operation is simple and safe.

Description

technical field [0001] The present invention relates to a Claus process H 2 The invention discloses a catalytic combustion method for S acid gas, which belongs to the technical field of sulfur resource recovery. Background technique [0002] At present, the industry mainly adopts the Claus process to treat H 2 S acid gas treatment and sulfur resource recovery. The sulfur furnace is the core device of the Claus process. On the one hand, it must not only strictly ensure the H 2 S / SO 2 The molar ratio is equal to or close to 2 to ensure the smooth progress of the subsequent Claus reaction; on the other hand, it is also necessary to ensure that the impurity gas ammonia in the acid gas is completely oxidized and decomposed into N by combustion. 2 and H 2 O, and completely burn impurities such as hydrocarbons, mercaptans, and cyanide into SO 2 , CO 2 、H 2 O et al. Because these impurity gases (NH 3 and HC) can be extremely detrimental to the Claus process, especially amm...

Claims

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Application Information

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IPC IPC(8): F23G7/07
CPCF23G7/07
Inventor 张鑫蒋国霞郝郑平曲思秋高炬
Owner SHANDONG SUNWAY PETROCHEMICAL ENGINEERING CO LTD
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