Integrated method and device of high temperature coal gas desulfur and dust removing

A technology for desulfurization, dust removal and coal gas, which is applied in the field of high temperature gas purification, can solve the problems of difficulty in full utilization, corrosion of filter plates, and high filtration gas velocity, so as to reduce equipment investment and operating costs, reduce floor space, and overcome problems of low utilization rate. Effect

Inactive Publication Date: 2005-08-03
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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Problems solved by technology

The main advantage of the cross-flow moving bed desulfurization reactor is that the bed resistance is small, the cross section is large, the bed volume utilization rate is high, and the operation is stable; the disadvantage is that the conversion rate of desulfurizer particles is large, and it is difficult to fully utilize
The main advantage of moving particle bed depth filtration is high filtration gas velocity, constant pressure filtration, and no need for backflushing operation; the disadvantage is that the capture rate of fine dust is low, and it is difficult to reach the system purification index
The surface filter has high dust removal efficiency, but requires frequent back blowing operations, and the system structure is complex
Patent CN1236660 discloses a method and equipment that combines the advantages of surface filtration and particle layer depth filtration. It has high efficiency for fine dust collection and does not require backflushing operation. It has a good application prospect, but it cannot remove solid and gaseous pollution at the same time. When dealing with corrosive gases, it is easy to cause corrosion of the filter plate and affect the stable operation of the equipment

Method used

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  • Integrated method and device of high temperature coal gas desulfur and dust removing
  • Integrated method and device of high temperature coal gas desulfur and dust removing
  • Integrated method and device of high temperature coal gas desulfur and dust removing

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The desulfurizer is a granular iron oxide high-temperature desulfurizer with a particle size of 0.5-3mm. The operating conditions are: the operating temperature is 500 to 550°C, and the operating pressure is 1 MPa (gauge pressure). The composition of oxygen / steam blast gas is (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%. The dust concentration in the crude gas is 5.2g / Nm 3 , H 2 S concentration 6000ppmv. First, the iron oxide high temperature gas desulfurizer particles are loaded into the feed hopper 1 and the composite particle bed 4, N 2 Pressurize to 1.0MPa, then introduce high-temperature crude gas from the air inlet 24, control the gas velocity through the bed at about 0.15m / s, start the discharger 6, and control the moving speed of the desulfurizer to be about 36cm / h. The gas enters the lower moving bed through the gas inlet chamber 15, and cross-flow contacts with the desulfuri...

Embodiment 2

[0025] Air / steam blasting produces high temperature gas, the gas composition 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%. The dust concentration in the crude gas is 6.4g / Nm 3 , H 2S concentration 3000ppmv. The moving speed of the desulfurizer is controlled to be about 25 cm / h, and the gas velocity through the bed is controlled to be about 0.1 m / s, and the rest are the same as in Example 1. The dust concentration in the purified gas can be stabilized at 20mg / Nm 3 Below, H 2 S concentration can be stabilized at 30 ~ 100ppmv. All dust with a particle size of 5 μm or more is removed.

Embodiment 3

[0027] The moving speed of the desulfurizer is controlled to be about 18 cm / h, and the rest are the same as in Example 2. The dust concentration in the purified gas can be stabilized at 10mg / Nm 3 Below, H 2 S concentration can be stabilized at 70 ~ 150ppmv. All dust with a particle size of 5 μm or more is removed.

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Abstract

A process for desulfurizing and dusting high-temp gas features that the metallic oxide as desulfurizing agen is used as filter medium, the composite moving particles bed is used as filter, and the particles move downward and gas passes transversely through the particle layer to remove gas-state sulfide and dust. Said composite particles-moving bed has upper and lower layers and the gas passes through the particle layer upward.

Description

Technical field: [0001] The invention belongs to a high-temperature gas purification method and equipment, in particular to a method and equipment for realizing the integration of high-temperature gas desulfurization and dust removal by a composite particle moving bed. Background technique: [0002] Coal-fired power generation is an effective means to achieve efficient and clean utilization of coal. Coal gasification combined cycle power generation (Integrated Gasification Combined Cycle, IGCC) will become a new generation of mainstream power generation technology due to its high efficiency and low pollution. Dust and H are unavoidably present in the fuel gas produced by coal gasification 2 S, COS and other sulfides (H 2 S accounts for about 90%), these components will corrode and wear downstream equipment, causing environmental pollution. Therefore, high temperature gas purification plays an important role in improving the overall power generation efficiency, prolonging ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10K1/30
Inventor 黄戒介赵建涛王泽吴晋沪张尚武
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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