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Method for using low-ash-fusing-point coal for catalytic gasification

A technology of ash melting point and catalyst, applied in gasification process, granular/powder fuel gasification, production of combustible gas, etc., can solve problems such as loss of fluidization, difficulty in continuous and stable operation of the reactor, and difficulty in slag discharge.

Inactive Publication Date: 2015-03-25
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of catalytic gasification, it is necessary to add a certain amount of alkali (alkaline earth) salt as a catalyst. These fluxed alkali (alkaline earth) salt catalysts will reduce the melting temperature of coal ash, and will aggravate the agglomeration of coal ash particles at high temperatures slag, in severe cases, it is difficult to discharge slag, or even lose fluidization, etc., making it difficult for the reactor to operate continuously and stably

Method used

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  • Method for using low-ash-fusing-point coal for catalytic gasification
  • Method for using low-ash-fusing-point coal for catalytic gasification
  • Method for using low-ash-fusing-point coal for catalytic gasification

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Effect test

Embodiment 1

[0020] (1) In the Wangjiata coal sample with an ash melting point of 1177°C, the coal sample and K 2 CO 3 The catalyst solution is impregnated and loaded at a volume ratio of 1:1, so that K in the Wangjiata coal sample of the loaded catalyst 2 CO 3 The catalyst loading was 20 wt%.

[0021] (2) Add 10wt% clay additive to the Wangjiata coal sample after loading the catalyst by means of mechanical mixing.

[0022] (3) Put the sample prepared in step (1) in a fluidized bed at a reaction temperature of 650 °C, a reaction pressure of 3 MPa, and a residence time of 1 h. Gasification is carried out under a water vapor atmosphere, and obvious agglomeration occurs. The sintering temperature is 580 °C. °C, the gas composition after gasification is shown in Table 1.

[0023] (4) Put the sample prepared in step (2) in a fluidized bed at a reaction temperature of 650 °C, a reaction pressure of 3 MPa, and a residence time of 1 h. Gasification is carried out under a steam atmosphere, and ...

Embodiment 2

[0025] (1) In the Wangjiata coal sample with an ash melting point of 1177°C, the coal sample and K 2 CO 3 The catalyst solution is impregnated and loaded at a volume ratio of 1:1, so that K in the Wangjiata coal sample of the loaded catalyst 2 CO 3 The catalyst loading was 15 wt%.

[0026] (2) After loading the catalyst, 8wt% of kaolin additives were mixed into the Wangjiata coal sample by mechanical mixing.

[0027] (3) Put the sample prepared in step (1) in a fluidized bed at a reaction temperature of 700 °C, a reaction pressure of 3.5 MPa, and a residence time of 2 h. Gasification is carried out under a water vapor atmosphere, and serious slagging occurs. The sintering temperature is 610 °C. °C, the gas composition after gasification is shown in Table 1.

[0028] (4) Put the sample prepared in step (2) in a fluidized bed at a reaction temperature of 700 °C, a reaction pressure of 3.5 MPa, and a residence time of 2 h. Gasification is carried out under a water vapor atmos...

Embodiment 3

[0030] (1) In the Wangjiata coal sample with an ash melting point of 1177°C, the coal sample and Na 2 CO 3 The catalyst solution is impregnated and loaded according to the volume ratio of 1:1, so that the Na in the Wangjiata coal sample of the loaded catalyst 2 CO 3 The catalyst loading was 8 wt%.

[0031] (2) Add 5wt% diatomite additive to the Wangjiata coal sample after loading the catalyst by means of mechanical mixing.

[0032] (4) Put the sample prepared in step (1) in a fluidized bed at a reaction temperature of 750°C, a reaction pressure of 4MPa, and a residence time of 3h. Gasification is carried out under a steam atmosphere, and severe slagging occurs. The sintering temperature is 685°C , the gas composition after gasification is shown in Table 1.

[0033] (4) Put the sample prepared in step (2) in a fluidized bed at a reaction temperature of 750 °C, a reaction pressure of 4 MPa, and a residence time of 2 h. Gasification is carried out under a steam atmosphere, an...

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Abstract

The invention relates to a method for using low-ash-fusing-point coal for catalytic gasification. The method comprises the following steps of: by taking low-ash-fusing-point coal loaded with a catalyst as a raw material, blending an additive to the raw material for mixing to obtain a sample, wherein the sample comprises the following components in percentage by weight: 90%-95% of the low-ash-fusing-point coal loaded with the catalyst and 5%-10% of the additive; gasifying the prepared sample loaded with the catalyst in a fluidized bed. The method disclosed by the invention has the advantages of being simple and practical, increasing the coal ash fusing point and sintering temperature by regulating the addition amount of the additive as required, and meeting the requirement for application of coal highly loaded with the catalyst in a catalytic gasification process.

Description

technical field [0001] The invention relates to a method for using low ash melting point coal for catalytic gasification. Background technique [0002] China is the world's largest coal producer and consumer, accounting for 1 / 4 of the world's coal production. China's total coal resources are 5.6 trillion tons, and the proven reserves exceed 1 trillion tons, accounting for 11% of the world's total reserves. Coal is the most widely distributed and abundant mineral energy in my country. Today and for a long period of time in the future, coal still plays a dominant role in the production and consumption of primary energy in my country. [0003] In my country, due to the coal-based energy structure and low-efficiency energy utilization, the development, processing and utilization of coal have become the main source of environmental pollutant emissions. SO emissions from coal combustion 2 Accounted for 87% of the total emissions of various pollution sources, dust accounted for ...

Claims

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Application Information

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IPC IPC(8): C10J3/54
CPCC10J3/466C10J2300/0986
Inventor 毕继诚芦涛李克忠张荣
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI