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Dispersion method for preparing stable coal-oil slurry and stability evaluation method

An evaluation method and oil-coal slurry technology, applied in the field of oil-coal slurry, can solve the problem of inability to accurately judge the sedimentation of pulverized coal

Pending Publication Date: 2019-10-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is based on the fact that the density of barite in the drilling fluid is much greater than that of the drilling gel, and the density and color of coal powder and heavy oil in the oil-coal slurry are similar, so the method of measuring the density difference and observing it cannot be accurately judged Sedimentation of pulverized coal

Method used

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  • Dispersion method for preparing stable coal-oil slurry and stability evaluation method
  • Dispersion method for preparing stable coal-oil slurry and stability evaluation method
  • Dispersion method for preparing stable coal-oil slurry and stability evaluation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]According to the above process, combined with specific raw coal and raw oil, the preparation of stable oil coal slurry and the evaluation of stability are carried out, the specific conditions are as follows: raw coal is Xinjiang lignite (XJ), dry coal moisture content 2.03%, ash content 5.49% , the raw material oil is a mixed oil (M:F=1:1) with a mass ratio of catalytic cracking oil slurry (FCCS) / Ma Rui normal residue (MRAR) / Ma Rui normal residue (MRAR) to catalytic cracking oil slurry (FCCS) at a mass ratio of 1:1, The viscosity is 173 / 1806 / 312mpa s, the mass flow ratio of coal:oil is 1:3 / 21:29, the particle size of coal powder is 150μm, the stirring speed is 30rpm, the dispersion time is 1h, and the stirring temperature is 120°C. The specific test data are shown in Table 1:

[0044]

[0045] Table 1

[0046] Repeat the above raw materials and conditions, and the specific data of some tests are as follows in Table 2:

[0047]

[0048] Table 2

Embodiment 2

[0050] According to the above process, combined with specific raw coal and raw oil, the preparation of stable oil coal slurry and the evaluation of stability are carried out, the specific conditions are as follows: raw coal is Xinjiang lignite (XJ), dry coal moisture content 2.03%, ash content 5.49% , the raw material oil is a mixed oil (M:F=1:1) with a mass ratio of MRAR and FCCS (FCCS), the viscosity is 312mpa s, and the mass flow ratio of coal:oil is 21: 29. Coal powder particle size is 150μm, stirring rate is 30 / 100rpm, dispersion time is 1 / 3h, stirring temperature is 120 / 160°C, the test data are as follows in Table 3:

[0051]

[0052] table 3

[0053] As can be seen from Example 1 and Example 2, the dispersion method adopted in the present invention can make the relative deviation of the supernatant of the oil-coal slurry less than 10%, effectively improving the stability of the oil-coal slurry system, and the repetition of solid content measurement The experimental ...

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Abstract

The invention discloses a dispersion method for preparing stable coal-oil slurry and a stability evaluation method. The dispersion method comprises the following steps: crushing and screening raw material coal by using an ultrafine grinder, and drying fine-particle pulverized coal by using a rotary kiln; preheating the raw oil by using a preheating furnace; respectively conveying dried coal with proper moisture content and ash content and the preheated oil with proper viscosity into a stirring kettle according to a certain mass flow ratio, uniformly mixing the two raw materials at a certain stirring rate, and continuously dispersing for a period of time; according to the dispersion method for preparing the stable coal-oil slurry and the stability evaluation method provided by the invention, the coal-oil slurry with relatively good stability can be prepared, and the stability of the prepared coal-oil slurry is evaluated.

Description

technical field [0001] The invention relates to the technical field of oil-coal slurry, in particular to a dispersion method and a stability evaluation method for preparing stable oil-coal slurry. Background technique [0002] The oil-coal slurry is a binary heterogeneous system, and the coal powder will naturally settle due to gravity, resulting in solid-liquid phase separation of the oil-coal slurry and reducing the stability of the system. In the coal / oil hydrogenation co-refining process, the deposition of pulverized coal in the pipeline and the check valve of the coal slurry pump will cause serious consequences such as pipeline blockage, equipment damage and even a sudden increase in bed pressure, resulting in long-term equipment failure. There are potential safety hazards in the continuous operation of the cycle, which greatly restricts the promotion and development of the process. In addition, in view of the complex mechanism of action between coal and oil, there is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/44G01N1/38G01N5/04
CPCG01N1/28G01N1/286G01N1/38G01N1/44G01N5/04
Inventor 邓文安李传王兴兆罗辉杜峰李庶峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)