Method and device for thermally desulfurizing by synthesis gas dry method and reclaiming sulfur

A synthesis gas and sulfur recovery technology, applied in the direction of sulfur preparation/purification, catalytic conversion gas purification of impurities, etc., can solve the problems of complex desulfurizer regeneration and sulfur recovery operations, unsuitable for continuous industrial production applications, etc., to achieve The process structure is simple and reasonable, the wear is small, and the operation stability is good.

Inactive Publication Date: 2012-11-14
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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Problems solved by technology

During the desulfurization reaction, a small amount of oxygen is added to the reaction atmosphere, and the activated carbon can selectively catalyze and oxidize the sulfide in the synthesis gas into elemental sulfur, which is adsorbed and stored in the pore structure of the activated carbon, but the traditional fixed-bed desulfurization reactor desulfurization Agent regeneration and sulfur recovery operations are complex, not suitable for continuous industrial production applications

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  • Method and device for thermally desulfurizing by synthesis gas dry method and reclaiming sulfur

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Effect test

Embodiment 1

[0026] The fast fluidized bed desulfurization reactor is 16000mm high, the inner diameter of the upper straight pipe section is 50mm, and the inner diameter of the lower expanded section is 80mm. The height of the desulfurizer regeneration reactor is 1500mm, and the inner diameter is 200mm. The desulfurizer is an amorphous activated carbon desulfurizer with a particle size of 150-500μm and a bulk density of 0.65g / ml. Composition of oxygen blast fluidized bed gasification synthesis gas (volume percentage): H 2 content 28%, CO content 25%, N 2 Content 6%, CH 4 Content 1%, CO 2 Content 16%, H 2 O content 24%, H 2 S concentration 2800-3200mg / m 3 , COS concentration 10-20mg / m 3. The operating temperature of the desulfurization reactor is 160-180°C, the pressure is 1.0MPa, the apparent operating gas velocity is 1.0-1.8m / s, the oxygen-sulfur ratio is 0.45-0.55, and the operating temperature of the desulfurization agent regeneration reactor is 380-400°C. First, desulfurizer p...

Embodiment 2

[0028] The desulfurizing agent is an activated carbon desulfurizing agent loaded with iron, the loading amount of iron oxide is 0.5%, the particle size is 200-500 μm, and the bulk density is 0.65 g / ml. Using air blast fluidized bed gasification to produce synthesis gas, the composition of synthesis gas is (volume percentage): H 2 content 15%, CO content 13%, N 2 Content 46%, CH 4 Content 1%, CO 2 Content 10%, H 2 O content 15%, H 2 S concentration 1500-1800mg / m 3 , COS concentration 10-20mg / m 3 . The operating temperature of the desulfurization reactor is 160-180°C, the pressure is 0.6MPa (table), the operating gas velocity is 1.8-2.0m / s, and the oxygen-sulfur ratio is 0.45-0.55. The operating temperature of the desulfurizer regeneration reactor is 420-450°C, with 450°C superheated steam as the regeneration gas, and the rest are the same as in Example 1. After desulfurization and purification, the sulfide content in the syngas is 25-35mg / m 3 , The elemental sulfur con...

Embodiment 3

[0030] The desulfurizing agent is an activated carbon desulfurizing agent loaded with iron, with an iron oxide load of 0.5%, a particle size of 200-500 μm, and a bulk density of 0.65 g / ml. Using air blast fluidized bed gasification to produce synthesis gas, the composition of synthesis gas is (volume percentage): H 2 content 15%, CO content 13%, N 2 Content 46%, CH 4 Content 1%, CO 2 Content 10%, H 2 O content 15%, H 2 S concentration 1500-2000mg / m 3 , COS concentration 10-20mg / m 3 . The operating temperature of the desulfurization reactor is 180-210°C, the pressure is 1.3MPa (table), the operating gas velocity is 1.2-1.5m / s, and the oxygen-sulfur ratio is 0.5-0.6. The operating temperature of the desulfurizer regeneration reactor is 420-450°C, with 450°C superheated steam as the regeneration gas, and the rest are the same as in Example 1. After desulfurization and purification, the sulfide content in the syngas is 45-75mg / m 3 , The elemental sulfur content of desulfu...

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Abstract

The invention relates to a method for thermally desulfurizing by a synthesis gas dry method and reclaiming sulfur, which comprises the following steps: in a temperature range of between 150 and 250 DEG C, in a two-section fluidized bed desulfurizing reactor, using a catalyzed sorption desulfurizing agent to selectively catalyze and oxidize sulfide in synthesis gas into elemental sulfur which is adsorbed in pore structures of the desulfurizing agent; and under the condition that the desulfurizing agent for adsorbing the sulfur is at a temperature of between 300 and 500 DEG C under normal pressure, introducing the regenerated gas to carry out thermal regeneration, and reclaiming the elemental sulfur in the regenerated tail gas so as to recycle the desulfurizing agent. The two-section fluidized bed desulfurizing reactor is divided into an upper section and a lower section by necking, the diameter ratio of the lower expanded section to the upper straight pipe section is 1.5-3.5:1, the gasenters a gas distribution chamber from the bottom of the fluidized bed, the lower part of the reactor keeps a turbulent motion fluid state, and the upper part of the reactor keeps quick fluid state. The gas carrying solid leaves from the top of the desulfurizing reactor; after the gas and solid are separated, a reversing valve controls the flow direction of solid granules, and a part of the desulfurizing agent enters a regeneration reactor to carry out thermal regeneration; and the desulfurizing efficiency is more than 95 percent, and the reclaiming rate of the sulfur is more than 90 percent.The invention has the advantages of compact process, simple regeneration, low energy consumption, continuous operation, large gas processing capability, and the like.

Description

technical field [0001] The invention belongs to a synthesis gas dry thermal desulfurization and sulfur recovery method. Background technique [0002] The development of coal chemical industry and coal gasification power generation technology based on coal gasification, and the realization of the overall optimization of coal, electricity, and chemical systems are important to solve my country's coal pollution and oil shortages, and to achieve overall optimization and sustainable development of resources, energy, and the environment. research direction. Sulfide is one of the main pollutants in gas, which can cause equipment corrosion, catalyst poisoning and environmental pollution. For large-scale coal electrification production process, the use of higher temperature hot gas purification technology can improve system efficiency, simplify process flow and reduce sewage discharge. [0003] The currently developed high-temperature desulfurization technology mainly uses metal oxi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10K1/34C01B17/04
Inventor 赵建涛黄戒介房倚天张永奇王洋
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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