Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing high-concentration coal-water slurry from lignite through medium-temperature upgrading

A high-concentration water and coal-upgrading technology, which is applied in the direction of combustion methods, block/powder fuel preparation, combustion equipment, etc., can solve the problems that it cannot be used as boiler fuel and coal gasifier raw material, and has not made breakthrough progress, etc. Achieve the effects of excellent performance, low production cost and simple process

Active Publication Date: 2015-03-25
WUHUAN ENG
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For a long time, the technology of preparing high-concentration coal-water slurry from low-rank coal (especially lignite) has not made breakthroughs. The concentration of coal-water slurry prepared after lignite is directly ground is 45%-50%, which cannot be used as boiler fuel and coal gasifier raw material

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing high-concentration coal-water slurry from lignite through medium-temperature upgrading
  • Method for preparing high-concentration coal-water slurry from lignite through medium-temperature upgrading
  • Method for preparing high-concentration coal-water slurry from lignite through medium-temperature upgrading

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1, lignite is pre-broken to below 10mm, the drying temperature is controlled at 150°C in a gauge pressure of 0-0.1MPa and an inert gas environment, the heating rate is at 100-150°C / s, and the residence time is controlled at 40min. After drying Coal is pyrolyzed at medium temperature, the reaction temperature is controlled at 750°C, the heating rate is 100-500°C / s, and the residence time is controlled at 20min. The upgraded coal after cooling uses a ball mill to grind coal for sample preparation. The diameter ratio of the steel balls is 20mm, 12mm and 5mm, and the mass ratio is 20%:50%:30%. The ball mill speed is set at 170r / min. Coal time 3min. The coal samples were sieved with a 1mm sieve, and the coal samples smaller than 1mm were mixed with water evenly, and then stirred with a stirrer with a rotation speed of 1000r / min for 18min, and finally the coal water slurry samples of the examples were prepared. The results are shown in Table 3.

Embodiment 2

[0024] Example 2, the lignite is pre-broken to less than 10mm, the drying temperature is controlled at 280°C under normal pressure and an inert gas environment, the heating rate is 100-150°C / s, the residence time is controlled at 35min, and the dried coal is subjected to medium-temperature pyrolysis , the reaction temperature is controlled at 620°C, the heating rate is at 100-500°C / s, and the residence time is controlled at 25min. The upgraded coal after cooling uses a ball mill to grind coal for sample preparation. The diameter ratio of the steel balls is 20mm, 12mm and 5mm, and the mass ratio is 20%:50%:30%. The ball mill speed is set at 170r / min. Coal time 3min. Coal samples were sieved with a 1mm sieve, and water and additives (lignin, used in an amount of 0.3% of the upgraded coal, wt) were added to coal samples smaller than 1mm and mixed evenly, and then stirred for 15 minutes with a stirrer at a speed of 1000r / min, and finally prepared Become embodiment coal water slur...

Embodiment 3

[0025] Example 3, lignite is pre-broken to less than 10mm, the drying temperature is controlled at 300°C under normal pressure and an inert gas environment, the heating rate is 100-150°C / s, the residence time is controlled at 30min, and the dried coal is subjected to medium-temperature pyrolysis , the reaction temperature is controlled at 600°C, the heating rate is at 100-500°C / s, and the residence time is controlled at 30min. The upgraded coal after cooling uses a ball mill to grind coal for sample preparation. The diameter ratio of the steel balls is 20mm, 12mm and 5mm, and the mass ratio is 20%:50%:30%. The ball mill speed is set at 170r / min. Coal time 3min. Coal samples were sieved with a 1mm sieve, and water and additives were added to coal samples smaller than 1mm (ZM-19 high-efficiency coal-water slurry additive, produced by Changzhou Zhongnan Chemical Co., Ltd., with lignin as the main raw material, and the dosage was 0.3% of the upgraded coal, wt) and mix evenly, the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for preparing high-concentration coal-water slurry from lignite through medium-temperature upgrading. The method is used for solving the problem of the existing low-rank coal that the slurry concentration is low. The method comprises the processes of carrying out deep drying on lignite, carrying out medium-temperature reaction, cooling upgraded coal and grinding the coal to produce slurry, wherein the deep drying and medium-temperature pyrolysis reaction are combined, so as to upgrade the lignite. According to the method, the process is simple, the production cost is low, and the prepared coal-water slurry is high in concentration and excellent in various properties, so that the utilization way of the low-rank coal, particularly the lignite, is expanded; the method is applicable to the preparation of the coal-water slurry for gasification.

Description

technical field [0001] The invention relates to a process for upgrading the quality of coal chemical industry, in particular to a method for preparing high-concentration coal-water slurry through medium-temperature upgrading of lignite. Background technique [0002] In my country, low-rank coal reserves represented by lignite and low-metamorphic bituminous coal account for more than 55% of the total coal resources. Among them, lignite accounts for about 13%, mainly distributed in eastern Inner Mongolia and Yunnan, and a small amount is distributed in Heilongjiang, Liaoning, Shandong, Jilin, and Guangxi; low-metamorphic bituminous coal is mainly distributed in Shaanxi, western Inner Mongolia, and Xinjiang. [0003] As high-metamorphic coals are used less and less, the efficient and clean utilization of low-rank coals is becoming increasingly important. At present, the efficient conversion and utilization method of low-rank coal is pyrolysis after drying. As of 2013, there a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C10L1/32C10L1/10C10L1/192C10B53/04C10B57/10F23K1/02
Inventor 陈钢曾凡虎李泽海杨建国黄学群夏吴
Owner WUHUAN ENG