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A method and device for increasing the concentration of low-rank coal-water slurry by pipeline hydrothermal treatment

A hydrothermal treatment and coal-water slurry technology, which is applied in liquid carbon-containing fuels, petroleum industry, fuels, etc., can solve the problems of high requirement of raw coal, poor concentration effect, dust pollution and explosion, etc., and achieve the effect of full recycling.

Active Publication Date: 2019-02-15
DATANG INT CHEM TECH RESINST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high internal water content and many voids of low-rank coal, its slurry concentration is low, generally 30-50%, which limits its use in coal-water slurry gasification, a mature and stable gasification method.
[0004] At present, there are many technologies for increasing the slurry concentration of low-rank coal at home and abroad, but all of them have certain shortcomings, such as high processing cost, high energy consumption, technical risks such as dust pollution and explosion, poor concentration effect, raw material High coal requirements

Method used

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  • A method and device for increasing the concentration of low-rank coal-water slurry by pipeline hydrothermal treatment
  • A method and device for increasing the concentration of low-rank coal-water slurry by pipeline hydrothermal treatment
  • A method and device for increasing the concentration of low-rank coal-water slurry by pipeline hydrothermal treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] refer to figure 1 , this embodiment is used to illustrate the device for increasing the concentration of low-rank coal-water slurry, which includes: multi-stage exhaust steam preheating system E, further preheating casing heat exchanger F, tubular reactor G, multi-stage flash evaporation System I, filtration plant K and pulping plant L.

[0117] Among them, the multi-stage exhaust steam preheating system E includes a plurality of exhaust steam preheating casing heat exchangers connected in series. For example, the multi-stage exhaust steam preheating system E includes 4 or 10 exhaust steam preheating casing heat exchangers connected in series. At this time, the multi-stage exhaust steam preheating system E is correspondingly a 4-stage exhaust steam preheating system Or 10-stage exhaust steam preheating system.

[0118] Further preheating The casing heat exchanger F is configured to heat the coal-water slurry preheated by the multi-stage exhaust steam preheating system...

Embodiment 2

[0124] refer to figure 2 , This embodiment further illustrates the device for increasing the concentration of low-rank coal-water slurry. In addition to the structures listed in Embodiment 1, the device also includes a plurality of condensed water tanks J.

[0125] Among them, the number of condensed water tanks J is the same as the number of exhaust steam preheating casing heat exchangers in the multi-stage exhaust steam preheating system E, and each condensate water tank is connected to each exhaust steam preheating casing heat exchanger , so as to collect the flash gas condensate (eg, condensed water) after heat exchange through the exhaust steam preheating sleeve heat exchanger. Wherein, the bottoms of each condensed water tank except the last-stage condensed water tank are connected to the next-stage condensed water tank, and the tops of each condensed water tank are connected to the exhaust corresponding to the reverse flow of the condensed water tank step by step. Th...

Embodiment 3

[0127] refer to image 3 , This embodiment further illustrates the device for increasing the concentration of low-rank coal-water slurry. In addition to the devices listed in Example 2, the device also includes: a pulse buffer H arranged between the tubular reactor G and the multistage flash system I.

[0128] Wherein, the coal-water slurry inlet of the pulse buffer H is connected with the coal-water slurry outlet of the tubular reactor G, and the coal-water slurry outlet of the pulse buffer H is connected with the first-stage flash tank in the multi-stage flash system I CWS inlet connection.

[0129] In addition, if Figure 1-3 As shown in , the device for increasing the concentration of low-rank coal-water slurry may also include crusher A, coal mill B, coal slurry tank C and coal slurry pump D. Among them, the crusher A is configured to crush the raw coal 1 into coal particles, the coal mill B is configured to wet-grind the coal particles to make low-rank coal-water slur...

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Abstract

The invention provides a method for increasing the water-coal-slurry concentration of low-rank coal through pipeline hydro-thermal treatment. The method comprises the steps of feeding to-be-treated water-coal-slurry of the low-rank coal into a multistage dead steam preheating system comprising a plurality of dead steam preheating casing pipe heat exchangers to perform stage-by-stage dead steam preheating, further heating to hydro-thermal treatment temperature and performing hydro-thermal treatment in a tubular reactor; feeding the obtained modified water-coal-slurry into a multistage flash steam system comprising a plurality of flash steam tanks to perform stage-by-stage flash steam to obtain temperature-reduced and pressure-reduced modified water-coal-slurry, and feeding the flashing steam, serving as dead steam, of each flash steam tank into the dead steam preheating casing pipe heat exchanger in countercurrent stage-by-stage correspondence with the flash steam tank to perform stage-by-stage dead steam preheating, wherein the number of the flash steam tanks is as same as that of the dead steam preheating casing pipe heat exchangers; and dehydrating part of the water-coal-slurry concentration of the low-rank coal to prepare high-concentration water-coal-slurry. By the method provided by the invention, the water-coal-slurry concentration can be increased from 30-50 percent to 55-65 percent, and energy can be completely recycled. The invention also provides a device for implementing the method.

Description

technical field [0001] The invention relates to the technical field of coal treatment, in particular to a method and a device for increasing the concentration of low-rank coal-water slurry through pipeline hydrothermal treatment. Background technique [0002] my country's "coal-rich, oil-poor, and gas-poor" energy structure determines that coal is the most important source of energy production and utilization in my country. For a long period of time in the future, China's primary energy production and consumption structure dominated by coal will be difficult. Change. my country's coal resources are relatively complete in variety, but there are few high-quality resources, and the quantity distribution is extremely uneven. Low-rank coals such as lignite and long-flame coal are relatively large, accounting for about 55% of the proven resource reserves, mainly distributed in eastern Inner Mongolia and Yunnan. Due to the low calorific value of low-rank coal and the flammability ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/32
CPCC10L1/326C10L2290/06C10L2290/141C10L2290/543C10L2290/547
Inventor 李春启刘卫兵康善娇梅长松齐永丽杨明顺刘鑫
Owner DATANG INT CHEM TECH RESINST