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Method for preparing coal water slurry from low-rank coal

A technology for low-rank coal and coal-water slurry, which is applied to the preparation of coal-water slurry for boiler combustion and pre-gasifier pulping, and the preparation of high-concentration coal-water slurry from low-rank coal, can solve the problem of complex pulping process and high operating cost. , high temperature and high pressure and other problems, to achieve the effect of simple process, simple and efficient method, and reduced requirements

Inactive Publication Date: 2015-10-07
中国东方电气集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of pulping process is also relatively complicated, requiring high temperature and high pressure, large investment and high operating cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing coal-water slurry from low-rank coal, comprising the following steps:

[0028] Step 1: sending lignite into a crusher for crushing to a particle size of 5 mm, and sending the crushed fine coal into a screw extrusion device;

[0029] Step 2: The fine-grained coal fed into the screw extrusion device is sheared and extruded under a pressure of 5 MPa. After destroying the inner pores of the fine coal particles, the moisture in the fine coal particles is precipitated to obtain wet caking coal , the precipitated water accounts for about 10% of the total water;

[0030] Step 3: Send the wet caking coal obtained in Step 2 into a mill, add additives and water at the same time, and grind it into a coal-water slurry with a concentration of 53%.

[0031] In the present invention, the water content in the lignite accounts for 18.95%, the volatile matter content is 35.13%, and the oxygen element content is 16.42%.

[0032] In the present invention, the additi...

Embodiment 2

[0035] A method for preparing coal-water slurry from low-rank coal, comprising the following steps:

[0036] Step 1: sending the lignite into the crusher for crushing until the particle size is 4mm, and sending the crushed fine coal into the screw extrusion device;

[0037] Step 2: The fine-grained coal fed into the screw extrusion device is sheared and extruded under a pressure of 25 MPa. After destroying the inner pores of the fine coal particles, the moisture in the fine coal particles is precipitated to obtain wet caking coal , the precipitated water accounts for about 40% of the total water;

[0038] Step 3: Send the wet caking coal obtained in Step 2 into a mill, add additives and water at the same time, and grind it into a coal-water slurry with a concentration of 55%.

[0039] In the present invention, in the step 1, the crushed fine-grained coal is preheated in the collection pipeline at the outlet of the crusher, and the preheating temperature is 50°C, and then sent...

Embodiment 3

[0044] A method for preparing coal-water slurry from low-rank coal, comprising the following steps:

[0045] Step 1: sending lignite into a crusher for crushing to a particle size of 3 mm, and sending the crushed fine coal into a screw extrusion device;

[0046] Step 2: The fine-grained coal fed into the screw extrusion device is sheared and extruded under a pressure of 40MPa. After destroying the inner pores of the fine coal particles, the moisture in the fine coal particles is precipitated to obtain wet caking coal , the precipitated water accounts for about 60% of the total water;

[0047] Step 3: Send the wet caking coal obtained in Step 2 into a mill, add additives and water at the same time, and grind it into a coal-water slurry with a concentration of 58%.

[0048] In the present invention, in the step 1, the crushed fine-grained coal is preheated in the collection pipe at the outlet of the crusher, and the preheating temperature is 100°C, and then sent to the screw ex...

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Abstract

The invention discloses a method for preparing coal water slurry from low-rank coal. The method is characterized by comprising the following steps: step 1: conveying the low-rank coal into a crusher to be crushed until the granularity is smaller than or equal to 5mm; conveying the crushed fine coal grains into a spiral extruding device; step 2: shearing and extruding the fine coal grains which are conveyed into the spiral extruding device under the pressure of 5 to 40MPa; after damaging inner pores in the fine coal grains, separating moisture in the fine coal grains to obtain wet sticky coal, wherein the separated moisture accounts for 10 percent to 60 percent of the total moisture; and step 3: conveying the wet sticky coal obtained by the step 2 into a mill and simultaneously adding an additive and water, and grinding the mixture into the coal water slurry with the concentration of 53 percent to 65 percent. The method for preparing the coal water slurry from the low-rank coal is extremely simple; waste heat is used for pre-heating brown coal and the brown coal is re-compacted, so that the pores of the low-rank coal can be effectively damaged and the surface properties of the low-rank coal are changed; the method has the advantages of low energy consumption, high efficiency and high slurry preparation concentration, and can be widely applied to preparation of the high-concentration coal water slurry by all types of the low-rank coal.

Description

technical field [0001] The invention belongs to the field of clean utilization of coal, and in particular relates to a method for preparing relatively high-concentration coal-water slurry from low-rank coal, which can be widely used in the preparation of coal-water slurry for boiler combustion and the pulping in front of a gasifier. Background technique [0002] Coal water slurry technology is a kind of clean coal technology. After decades of development in our country, it has become increasingly perfect. It is widely used in industrial boilers and kilns. At the same time, coal water slurry is used as a feed material for coal water slurry gasification. It has also been greatly used in the field. In recent years, with the increase of proven reserves of low-rank coal in my country, the industry has paid more and more attention to the utilization of low-rank coal. The development of low-rank coal pulping technology is not only the demand of the coal chemical industry, but also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32
Inventor 杨纯王晓亮陈慧徐莹璐赵庆吴家桦
Owner 中国东方电气集团有限公司
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