Modification method of three-high coal gasification reaction activity

A reactive and coal gasification technology, which is applied in the gasification process, granular/powdered fuel gasification, and the manufacture of combustible gas, can solve the problems of low effective components of coal gas, low coal conversion rate, low volatile content, etc., and achieve improvement Gasification reactivity, broad application prospects, effect of reduced pressure

Inactive Publication Date: 2020-11-20
GUIZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, dry pulverized coal gasification technology will appear when using "three high coals" (high ash, high ash melting point, and high sulfur content) in Southwest China as raw materials. High content, low volatile matter, poor activity, resulting in low conversion rate of coal, high carbon content in ash, low effective components in gas, etc.

Method used

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  • Modification method of three-high coal gasification reaction activity
  • Modification method of three-high coal gasification reaction activity
  • Modification method of three-high coal gasification reaction activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Select a typical "three-high coal" as raw material, grind and sieve to obtain an experimental sample with a particle size of 74-200 μm, which is recorded as raw coal;

[0019] 2) 20 g of the raw coal obtained in step 1) is taken and placed in a polytetrafluoroethylene beaker, and 400 ml of mass fraction of 68% concentrated nitric acid solution is added in the beaker, after stirring for 24 hours, the coal sample I is collected by filtration; then, the coal sample I Mix with 48% hydrofluoric acid solution at a ratio of 1:20, stir for 24 hours to ensure that the ash on the coal surface is completely removed, and filter to obtain coal sample II; then, wash repeatedly with 400ml of deionized water to ensure that the coal sample is completely removed HF solution in II; finally, dry coal sample II in a drying oven for 24 hours at a drying temperature of 120°C to obtain a modified coal sample.

[0020] 3) Carry out industrial analysis and elemental analysis on raw coal and m...

Embodiment 2

[0025] 1) Carry out the gasification experiment of pulverized coal in a thermogravimetric analyzer. First, place 10 ± 0.5 mg of raw coal and modified coal samples in a thermogravimetric crucible. 2 Heat up to 950°C at 20°C / min; after holding for 10 minutes, switch the gas to CO 2 , keep warm for 90min, stop the experiment; N 2 and CO 2 The flow rate is 50ml / min; record the instantaneous mass of pulverized coal during the reaction at 0, 10, 20, 30, 40, 50, 60, 70, 80, and 90 min, and then calculate the conversion rate of pulverized coal at different times.

[0026] Table 2 Conversion rate of samples during gasification experiment

[0027]

[0028]

[0029] It can be seen from the data in the table that the three-high coal modification method adopted in the patent of the present invention can significantly improve the gasification reaction activity of "three-high coal". When the reaction temperature is 950°C and the reaction time is 10 minutes, the conversion rate of raw...

Embodiment 3

[0031] 1) Carry out the gasification experiment of pulverized coal in a thermogravimetric analyzer. First, place 10 ± 0.5 mg of raw coal and modified coal samples in a thermogravimetric crucible. 2 Heat up to 1050°C at 20°C / min; after holding for 10 minutes, switch the gas to CO 2 , keep warm for 30min, stop the experiment; N 2 and CO 2 The flow rate is 50ml / min; record the instantaneous mass of pulverized coal during the reaction at 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20 minutes, and then calculate the conversion rate of pulverized coal at different times .

[0032] Table 3 Conversion rate of samples during gasification experiment

[0033] Response time (min) 0 10 20 30 40 50 60 70 80 90 Raw coal conversion rate 0 0.34 0.61 0.70 0.83 0.86 0.92 0.95 0.97 1.00 Conversion rate of modified coal 0 0.39 0.65 0.78 0.92 0.94 0.96 1.00 1.00 1.00

[0034] It can be seen from the data in the table that the three-high coal modif...

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Abstract

The invention discloses a modification method of three-high coal gasification reaction activity. The modification method is characterized by comprising the following steps: (1) grinding and screening:grinding a coal sample, and screening to obtain a 74-200 [mu]m sample; (2) HNO3washing: putting the coal sample obtained in the step (1) into a concentrated nitric acid solution, stirring for 24 hours, filtering and collecting the coal sample; (3) HF acid washing: mixing the filtered coal sample with a hydrofluoric acid solution in a ratio of 1: (15-20), stirring for 24 hours, and filtering; (4)washing: repeatedly stirring with deionized water, fully cleaning, filtering, and repeatedly cleaning for more than two times; and (5) drying: drying the washed sample to obtain the modified three-high coal.

Description

technical field [0001] The present invention belongs to the field of utilization of mineral resources, and in particular relates to a method for modifying coal mine resources with "high sulfur, high ash, and high ash melting point" and its application. Background technique [0002] The clean use of coal resources is an inevitable choice for the current domestic economic and social development. In order to meet the current demand for sustainable development, the clean use of coal should be based on the scientific development concept, and modern science and technology should be adopted to open up a new chemical industry road for the development of coal resources. As a key technology for clean coal power generation and coal chemical industry, dry coal powder pressurized gasification technology has the characteristics of low specific oxygen consumption, high cold gas efficiency, low self-consumption work, and low cost of purification system and gas cooler. Therefore, strengthen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/04C10L5/36C10J3/72C10J3/46
CPCC10J3/46C10J3/72C10J2300/0903C10J2300/0906C10J2300/0909C10J2300/093C10L5/04C10L5/366C10L2290/28C10L2290/545
Inventor 刘浪唐安江黄宏升郭俊江葛武杰
Owner GUIZHOU INST OF TECH
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