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A method and system for recovering insoluble alkali metal catalyst in catalytic gasification ash

A recovery method and technology of a recovery system are applied in the field of recovery of insoluble alkali metal catalysts in catalytic gasification ash and slag, and can solve the problems of poor solubility, low recovery efficiency and high economic cost

Active Publication Date: 2018-09-18
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the recovery process of insoluble alkali metal catalysts is usually: adding a large amount of digestion agents, such as calcium oxide, calcium hydroxide, etc., to the ash containing insoluble potassium metal catalysts, and ion exchange occurs under high temperature and pressure Reaction makes potassium ions exist in the form of soluble potassium salt, and it is recovered. However, due to the poor solubility of the digester in water, the exchange rate of ion exchange with the insoluble potassium metal catalyst is small. In practical applications, in order to increase The solubility of the digestion agent requires relatively harsh reaction conditions, complex operation, high economic cost and low recovery efficiency.

Method used

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  • A method and system for recovering insoluble alkali metal catalyst in catalytic gasification ash
  • A method and system for recovering insoluble alkali metal catalyst in catalytic gasification ash
  • A method and system for recovering insoluble alkali metal catalyst in catalytic gasification ash

Examples

Experimental program
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Effect test

Embodiment 1

[0077] Obtain insoluble alkali metal ash:

[0078] The coal catalytic gasification ash is subjected to water washing treatment, and the solid-liquid separation is carried out to obtain insoluble alkali metal ash and water washing liquid.

[0079] To recover the catalyst in the insoluble alkali metal ash:

[0080] 001) Detect the potassium ion content in the insoluble alkali metal ash, weigh a certain amount of digestant (calcium hydroxide), so that the molar ratio of calcium ion to potassium ion is 2, and add to the calcium hydroxide 1.5% polymer dispersant, and the mixture is ground in a wet mill until the particle size is less than or equal to 350 mesh.

[0081] 002) Inject the digester powder obtained in step 001) into a spray gun, and use the high-pressure airflow generated by a nitrogen compressor to entrain the digester powder with water vapor (the mass ratio of the water vapor to the insoluble alkali metal ash The mixture of 2) flows through the plasma charging unit in the pla...

Embodiment 2

[0085] The insoluble alkali metal ash used in the embodiment 2) is the same as that in the embodiment 1);

[0086] To recover the catalyst in the insoluble alkali metal ash:

[0087] 001) Detect the potassium ion content in the insoluble alkali metal ash, weigh a certain amount of digestant (calcium hydroxide) so that the molar ratio of calcium ion to potassium ion is 0.6, and add to the calcium hydroxide 0.5% polymer dispersant, and grind the mixture in a wet mill until the particle size is less than or equal to 350 mesh.

[0088] 002) Inject the digester powder obtained in step 001) into a spray gun, and use the high-pressure airflow generated by a nitrogen compressor to entrain the digester powder with water vapor (the mass ratio of the water vapor to the insoluble alkali metal ash The mixture of 3.9) flows through the plasma charging unit in the plasma generator at high speed, and the temperature of the plasma is controlled to 180°C.

[0089] 003) The mixture flowing through the ...

Embodiment 3

[0092] The insoluble alkali metal ash used in the embodiment 3) is the same as that in the embodiment 1);

[0093] To recover the catalyst in the insoluble alkali metal ash:

[0094] 001) Detect the potassium ion content in the insoluble alkali metal ash, weigh a certain amount of digestant (calcium hydroxide) so that the molar ratio of calcium ion to potassium ion is 1.95, and add to the calcium hydroxide 1% polymer dispersant, and grind the mixture in a wet mill until the particle size is less than or equal to 350 mesh.

[0095] 002) The digestion agent powder obtained in step 001) is injected into the spray gun, and the high-pressure air flow generated by the air compressor is used to entrain the digestion agent powder with water vapor (the mass ratio of the water vapor and the insoluble alkali metal ash The mixture of 0.5) flows through the plasma charging unit in the plasma generator at a high speed, and the temperature of the plasma is controlled to 160°C.

[0096] 003) The mix...

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Abstract

The invention relates to the technical field of catalyst recovery, in particular to a recovery method and system for an insoluble alkali metal catalyst in catalytic gasification ash. The method has simple process and low cost, and can also improve the recovery efficiency of the insoluble alkali metal catalyst. The invention overcomes the defects in the prior art that the poor solubility of the digestion agent in water makes the process conditions harsh, the cost is high, and the recovery efficiency of the insoluble alkali metal catalyst is low. A method for recovering insoluble alkali metal catalyst in catalytic gasification ash, comprising: step 1) washing catalytic gasification ash with water and performing solid-liquid separation to obtain insoluble alkali metal ash; step 2) digesting The activated digestion agent is obtained by plasma treatment to obtain the activated digestion agent; step 3) the activated digestion agent is mixed with the insoluble alkali metal ash in the presence of plasmaized water vapor, so that the digestion reaction occurs and the solid-liquid separation is carried out .

Description

Technical field [0001] The invention relates to the technical field of catalyst recovery, in particular to a method and system for recovering insoluble alkali metal catalysts in catalytic gasification ash. Background technique [0002] In the catalytic gasification process, the addition of a catalyst can effectively reduce the reaction temperature, increase the reaction rate, and increase the methane yield. In the existing coal catalytic gasification process, potassium carbonate has the best catalytic activity, but its cost Higher, it is necessary to recover the catalyst in the ash generated by the catalytic gasification reaction of coal to reduce the cost. [0003] In the existing coal catalytic gasification process, the existence of the catalyst is related to the coal quality (ash content, ash composition), gasification process (temperature, atmosphere, residence time), ash carbon conversion rate, etc. The coal ash content is high, The ash contains high Al and Si content, high g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/92B01J38/48B01J38/64B01J38/74
CPCB01J23/92B01J38/48B01J38/64B01J38/74
Inventor 毛燕东刘雷李克忠
Owner ENN SCI & TECH DEV
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