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Method for electrolysis, reduction and desulfurization of coal water slurry

A technology of coal water slurry and coal slurry, which is applied in the petroleum industry, solid fuel, fuel, etc., can solve the problems of low utilization rate, harsh conditions, coal quality destruction cost, etc., and achieve energy saving, mild reaction, reduction of material consumption and The effect of side effects

Inactive Publication Date: 2012-07-04
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned traditional chemical desulfurization process that requires high temperature and high pressure, harsh conditions, damage to coal quality, high cost, low utilization rate and other defects, and provides a method for desulfurization by electrolytic reduction of coal water slurry

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  • Method for electrolysis, reduction and desulfurization of coal water slurry
  • Method for electrolysis, reduction and desulfurization of coal water slurry
  • Method for electrolysis, reduction and desulfurization of coal water slurry

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Embodiment 1

[0036] The diagram of the deep desulfurization device for electrolytic reduction of coal water slurry is shown in Fig. figure 1 As shown, the process flow and schematic diagram of the deep desulfurization process and principle of coal-water slurry electrolytic reduction are shown in figure 2 As shown, using sodium metaborate as the electrolyte, sodium metaborate is converted into sodium borohydride through cathodic reduction reaction, and the sulfur in coal-water slurry is finally reduced to volatile hydrogen sulfide gas or S 2- , and then through filtration and elution to achieve desulfurization of coal water slurry before combustion. The graphite plate in the anode electrolysis cell 6 is the anode electrode 2, and the lead plate in the cathode electrolysis cell 3 is the cathode electrode 4. The generated hydrogen sulfide passes through the air duct and is finally introduced into the anolyte, where soluble sulfate is finally formed and absorbed. Add sodium metaborate and s...

Embodiment 2

[0038] Experimental method is as shown in embodiment 1, under the situation that does not add nickel chloride metal catalyst, it is 5g / L to get supporting electrolyte sodium metaborate concentration in the cathode electrolytic cell, and sodium hydroxide concentration is 1g / L and coal-water slurry concentration is 30g / L (particle size 120 mesh, sulfur content 0.5%), stir evenly, stirring speed is 300rpm; add sodium hydroxide solution concentration to 1g / L in the anode electrolytic cell; V, at the same time, turn on the magnetic stirrer to stir the solution in the electrolytic cell at a constant speed of 400rpm, and carry out the electrolytic reaction for 1h; after the electrolytic reaction is completed, filter and wash the product in the cathode electrolytic cell to obtain a low-sulfur and low-ash coal-water slurry solid. After the electrolysis is completed, the desulfurization rate of the coal water slurry is about 16.5%.

Embodiment 3

[0040]Experimental method is as shown in embodiment 1, under the situation of adding nickel chloride metal catalyst 2mmol / L, get supporting electrolyte sodium metaborate 20g / L in the cathode electrolytic cell, sodium hydroxide concentration 1g / L and coal-water slurry concentration are 10g / L (particle size 80 mesh, sulfur content ≥ 0.5%), stir evenly, stirring speed is 400rpm; add sodium hydroxide solution concentration to 5g / L in the anode electrolytic cell; feed the voltage 2.5V into the anode and cathode electrolytic cell At the same time, turn on the magnetic stirrer to stir the solution in the electrolytic cell at a constant speed of 300rpm, and carry out the electrolytic reaction for 3 hours; after the electrolytic reaction is completed, filter and wash the product in the cathode electrolytic cell to obtain a low-sulfur and low-ash coal-water slurry solid. After the electrolysis is completed, the desulfurization rate of the coal-water slurry is 48%, and about 24ml of hydr...

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Abstract

The invention relates to a method for electrolysis, reduction and desulfurization of coal water slurry, which comprises the following steps: a, adding sodium metaborate and sodium hydroxide solution into a cathode electrolysis cell, adding raw coal water slurry powder, and uniformly mixing; b, adding sodium hydroxide solution into an anode electrolysis cell; c, leading the voltage into the anode electrolysis cell and the cathode electrolysis cell, and simultaneously mixing the solution in the electrolysis cells for electrolysis; and d, filtering and washing products in the cathode electrolysis cell after the electrolysis, thus completing the electrolysis, reduction and desulfurization of the coal water slurry. The sodium metaborate is used as the main electrolyte, a small amount of sodium hydroxide is added as the auxiliary electrolyte, the electrochemical reduction reaction is carried out under alkaline conditions, the sulfur in the coal water slurry is converted into hydrogen sulfide, and the hydrogen sulfide is absorbed by alkali solution in the anode cell. Meanwhile, a small amount of metal Ni2+ catalyst is added into the cathode electrolysis cell, so that the desulfurization effect can be improved greatly. The reaction of the green electrochemical desulfurization process is mild, the operation is simple, the desulfurization efficiency is high, and the cost is low.

Description

technical field [0001] The invention relates to the fields of fuel treatment and environmental chemistry, in particular to a method for deep desulfurization of coal-water slurry by electrochemical catalytic reduction in the field of environmental chemical technology. Background technique [0002] SO from coal combustion x It is one of the main sources of atmospheric acid rain. Regardless of safety, environment, or economic considerations, coal must be pre-desulfurized. Coal desulfurization is mainly divided into pre-combustion desulfurization, desulfurization during combustion and post-combustion desulfurization (flue gas desulfurization). There are many problems in post-combustion desulfurization of coal, such as the wet limestone / gypsum method widely used in China. This method requires large capital investment, complex process system, high requirements for equipment materials, easy fouling and blockage of the system, and difficult disposal of the generated desulfurized g...

Claims

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Application Information

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IPC IPC(8): C10L9/02
Inventor 孙同华沈亚飞贾金平杨学丽张宏波
Owner SHANGHAI JIAO TONG UNIV
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