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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 difficult full utilization, corrosion of filter plates, high filtration gas velocity, etc., to reduce equipment investment and operating costs, reduce floor space, and overcome the problems of low utilization rate Effect

Inactive Publication Date: 2004-03-03
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Description
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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: operating temperature 500-550°C, operating pressure 1MPa (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%. Dust concentration in crude gas 5.2g / Nm 3 , H 2 S concentration 6000ppmv. First, put the iron oxide high temperature gas desulfurizer particles 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 bed gas velocity at about 0.15m / s, start the discharger 6, and control the moving rate of the desulfurizer to about 36cm / h. The gas enters the moving bed at the lower layer through the gas inlet chamber 15, and cross-flow contacts with the desulfurizing agent particles moving down to complet...

Embodiment 2

[0025] Air / steam blowing produces high-temperature gas, and the composition of the 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%. The dust concentration in crude gas is 6.4g / Nm 3 , H2 S concentration 3000ppmv. Control the desulfurizer moving rate to about 25cm / h, and control the bed gas velocity at about 0.1m / 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 The S concentration can be stabilized at 30-100ppmv. All dust with a particle size of 5 μm or more is removed.

Embodiment 3

[0027] Control the moving speed of desulfurizer to about 18cm / h, and the rest are the same as Example 2. The dust concentration in the purified gas can be stabilized at 10mg / Nm 3 Below, H 2 The 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 method and equipment for purifying high-temperature gas, in particular to a method and equipment for realizing the integration of high-temperature gas desulfurization and dust removal by a moving bed of composite particles. Background technique: [0002] Coal-fired power generation is an effective means to realize 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 unavoidable 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, wear downstream equipment, and cause environmental pollution. Therefore, high-temperature gas purification plays an important role in improving the overall power generation efficiency, prolonging the ...

Claims

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Application Information

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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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