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A method for drying and dehydrating lignite at normal temperature

A technology for drying and lignite at room temperature, applied in drying solid materials, drying solid materials without heating, drying, etc., can solve the problems of high energy consumption, large equipment investment, large amount of dust, etc., and achieve low energy consumption and safety. Reliable, environmentally friendly results

Inactive Publication Date: 2015-09-30
DATANG INT CHEM TECH RESINST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, the purpose of the present invention is to overcome the deficiencies in the existing lignite drying and dehydration process, such as high energy consumption, large equipment investment, and large amount of dust, and provide a safe, reliable, high environmental protection performance, low energy consumption, and simple process. Method for normal temperature drying and dehydration of lignite

Method used

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  • A method for drying and dehydrating lignite at normal temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This example is used to illustrate the method of lignite drying and dehydration at room temperature. The method includes the following steps:

[0049] (1) sending raw lignite with a moisture content of 39.7% by weight into the crusher 2 through the coal feeder 1 for crushing, and crushing into particles with an average particle size of less than 13 mm;

[0050] (2) Put 1.24kg of pulverized lignite into soaking tank 3 equipped with 1.28kg of soaking liquid and soak for 0.5h, wherein the soaking liquid is an aqueous solution containing sodium hypochlorite and sodium lauryl alcohol polyoxyethylene ether carboxylate, The concentrations of sodium hypochlorite and sodium lauryl alcohol polyoxyethylene ether carboxylate are respectively 0.005% by weight and 0.010% by weight;

[0051](3) Send the soaked lignite to the dewatering screen 4 for filtering, the dewatering screen 4 includes a first dewatering screen and a second dewatering screen, the aperture of the first dewaterin...

Embodiment 2

[0058] This example is used to illustrate the method of lignite drying and dehydration at room temperature. The method includes the following steps:

[0059] (1) sending raw lignite with a moisture content of 39.7% by weight into the crusher 2 through the coal feeder 1 for crushing, and crushing into particles with an average particle size of less than 8 mm;

[0060] (2) Put 1.21 kg of pulverized lignite into soaking tank 3 equipped with 2.10 kg of soaking liquid for soaking for 2 hours, wherein the soaking liquid is an aqueous solution containing ferrous chloride and sodium lauryl sulfate, ferrous chloride and sodium lauryl sulfate concentration are respectively 0.081% by weight and 0.243% by weight;

[0061] (3) Send the soaked lignite to the dewatering screen 4 for filtering, the dewatering screen 4 includes a first dewatering screen and a second dewatering screen, the aperture of the first dewatering screen is 0.5mm, and the aperture of the second dewatering screen is 0.5...

Embodiment 3

[0068] This example is used to illustrate the method of lignite drying and dehydration at room temperature. The method includes the following steps:

[0069] (1) sending raw lignite with a moisture content of 39.7% by weight into the crusher 2 through the coal feeder 1 for crushing, and crushing into particles with an average particle size of less than 6 mm;

[0070] (2) Put 1.26 kg of pulverized lignite into soaking tank 3 equipped with 3.08 kg of soaking liquid for soaking for 4 hours, wherein the soaking liquid is an aqueous solution containing dichloramine and sodium lauryl polyoxyethylene ether sulfate, dichloro The concentrations of amine and sodium laureth sulfate are 0.112% by weight and 0.418% by weight, respectively;

[0071] (3) Send the soaked lignite to the dewatering screen 4 for filtering, the dewatering screen 4 includes a first dewatering screen and a second dewatering screen, the aperture of the first dewatering screen is 0.5mm, and the aperture of the secon...

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Abstract

The invention provides a method of drying and dewatering brown coal at the normal temperature. The method includes the steps of 1, crushing raw brown coal; 2, soaking the crushed brown coal in soak solution; 3, filtering the soaked brown coal with a dewatering screen; 4, further dewatering the filtered brown coal in a dewatering machine. The soak solution is aqueous solution containing dewatering agent; the dewatering agent contains first dewatering agent and second dewatering agent; the first dewatering agent is made from one or multiple of ferrite, hypochlorite, chloramine compound and chlorine oxide; the dewatering agent in the soak solution is 0.01-1wt% in concentration; the weight ratio of the first dewatering agent to the second dewatering agent is 1:1-5. The method is safe, reliable, high in environment friendliness and low in energy consumption, the process is simple, and industrial application is facilitated.

Description

technical field [0001] The invention belongs to the field of coal processing, in particular to a method for drying and dehydrating lignite, in particular to a method for drying and dehydrating lignite at normal temperature. Background technique [0002] my country is very rich in coal resources. According to statistics at the end of the 20th century, the country has proven lignite reserves of 130 billion tons, accounting for about 13% of the country's total coal reserves. According to the results of the third national coal resource forecast, there are another 190.3 billion tons of predicted lignite resources in the country, accounting for 4.18% of the national predicted coal resources. However, due to the high water content of lignite, generally about 30% to 50% by weight, it directly leads to its low calorific value and small transportation radius, which restricts the efficient comprehensive utilization of lignite. Therefore, if the rational utilization of lignite resource...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B5/00F26B5/16
Inventor 刘立志孙果然李春启康善娇齐永丽牛瑞生杨明顺刘卫兵
Owner DATANG INT CHEM TECH RESINST