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Ultrasonic loading method of calcium-based desulfurizing agent for coal burning or gasificating desulphurization

A technology of desulfurization agent and coal combustion, which is applied in fuel, solid fuel, petroleum industry, etc. It can solve the problems of limiting the practical application of ion exchange method and loss of calorific value, and achieves good commercial application prospects, no secondary pollution, and simple principle Effect

Inactive Publication Date: 2009-01-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pulverized coal oxidation will lose calorific value, for example, when Ca / S reaches 1.3, it needs to lose 10-20% of calorific value. This oxidation method limits the practical application of ion exchange method

Method used

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  • Ultrasonic loading method of calcium-based desulfurizing agent for coal burning or gasificating desulphurization
  • Ultrasonic loading method of calcium-based desulfurizing agent for coal burning or gasificating desulphurization
  • Ultrasonic loading method of calcium-based desulfurizing agent for coal burning or gasificating desulphurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix 2g of Illinois#6 bituminous coal with a particle size range of 300-1000μm and analytically pure calcium oxide fine particles (<75um) according to Ca / S=0.5, 1, 1.5, 2.4, put the mixture into 100ml deionized water, and put the sample at room temperature Ultrasonic treatment for 2 hours, ultrasonic power 150W, frequency 20kHz, then filter the calcium-containing coal powder mixture, and dry in a constant temperature oven at 60°C for 12 hours under the protection of nitrogen to obtain a calcium-containing coal powder sample. 200 mg of different samples were taken respectively and put into a fixed bed reactor, the reactor air flow was 10% (volume fraction) oxygen+nitrogen, and the samples were burned under slow heating conditions. The reactor was heated from room temperature with a heating rate of 10°C / min, the final temperature was 800°C, and the holding time was 30 minutes.

[0030] Experimental desulfurization effect as figure 1 , the experiment compared the desulfuri...

Embodiment 2

[0033] Mix 2g of Illinois#6 bituminous coal with a particle size range of 300-1000μm and analytically pure calcium oxide fine particles (<75um) according to Ca / S=0.5, 1.5, 2.4, put the mixture into 100ml deionized water, and ultrasonicate the sample at room temperature 2h, ultrasonic power 300W, frequency 30kHz, then filter the calcium-containing coal powder mixture, and dry it in a constant temperature drying oven at 90°C for 18 hours under the protection of nitrogen to prepare a calcium-containing coal powder sample. 200 mg of different samples were taken respectively, and put into a fixed-bed reactor with the same atmosphere as described in Example 1, and the temperature of the reactor was maintained at 800°C. The sample burns rapidly in the reactor for a duration of 15 minutes.

[0034] Experimental desulfurization effect as image 3 , the experiment compared the desulfurization effect of the ultrasonic calcium-based loading method and the mechanical stirring hydration meth...

Embodiment 3

[0036] Mix Illinois#6 bituminous coal and calcium oxide fine particles according to Ca / S=1.5, put the mixture into 100ml deionized water, and treat the sample with ultrasonic at room temperature, ultrasonic power 150W, frequency 40kHz, treatment time 1h, 2h and 3h respectively. Then the calcium-containing coal powder mixture was filtered, and dried in a constant temperature drying oven at 75° C. for 15 hours under the protection of nitrogen to obtain a calcium-containing coal powder sample. 200 mg of different samples were taken respectively, put into a fixed-bed reactor, and burned under the same slow heating conditions as described in Example 1. The desulfurization efficiencies of the samples tested at different treatment times were 59% (1h), 61% (2h), and 71% (3h).

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Abstract

The invention relates to a calcium-based desulfurizer ultrasound loading method for coal burning or gas desulphurization in the chemical technology field. The steps are as follows: coal dust and calcium-based desulfurizer are mixed based on the calcium sulfur molar ratio that Ca / S equals to 0.5-3.5. The mixture is added to the water and processed ultrasound treatment under normal temperature. The treated sample is processed filtration and dried under the inert atmosphere. At last the coal dust contained with calcium is made. The invention uses the ultrasound treatment method, which not only makes the desulfurizer and the coal dust sufficiently mixed, the more important is that the surface of the coal dust is oxidized by using the chemical reaction of ultrasound cavitation, and the oxygen contained functional group is produced which can process ion exchange with the calcium ion in the solution, and the loading of the calcium is realized. The calcium bases are more evenly distributed on the surface of the coal dust, and the form that the fine calcium-based particle packs the coal dust is formed, at the same time, the highest desulfurization rate is achieved. The utilization rate of the desulfurizer is high. The energy consumption of the equipment is low. The treatment time is greatly reduced. The heat valve loss of the coal dust can not be caused.

Description

technical field [0001] The invention relates to a desulfurization method in the technical field of chemical industry, in particular to a calcium-based desulfurizer ultrasonic loading method for coal combustion or gasification desulfurization. Background technique [0002] China is a country rich in coal resources. At present, coal accounts for about 70% of primary energy consumption. The energy consumption structure dominated by coal and the use of high-sulfur coal have brought serious pollution problems to our country. More than 95% of sulfur is SO 2 released into the atmosphere, causing severe acid rain and ecological damage. Current control SO 2 There are two main technologies for sulfide emissions: desulfurization during combustion or gasification (in-furnace desulfurization) and post-combustion desulfurization (flue gas desulfurization). Compared with flue gas desulfurization, the furnace desulfurization technology has the advantages of convenient and flexible transf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/10C10L5/04
Inventor 范浩杰肖佳元袁军方曹明
Owner SHANGHAI JIAO TONG UNIV
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