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Intermittent sodium removal and purification method for high-sodium coal

A high-sodium coal, intermittent technology, applied in the field of coal cleansing, can solve the problems of reducing the calorific value of coal-fired boilers in the service life of boilers, making it difficult to fully utilize the advantages of Zhundong coal, increasing construction investment and power plant operating costs, etc., to achieve The effect of solving the problem of sodium gasification separation, small investment and safe operation

Inactive Publication Date: 2013-06-05
上海机易电站设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the utilization of Zhundong coal is very limited, and at the same time, local power plants have to purchase high-quality coal from other places, which not only increases the power generation cost of power generation companies, but also brings great difficulties to the development of Zhundong coalfield and the construction of power bases. , so it is difficult to give full play to the advantages of Zhundong Coal
[0006] For the blending method of using Zhundong high-sodium coal for power generation: basically, a, blending a certain amount of silicon; b, aluminum oxide, etc.; c, adding other coals for blending; these methods are all It belongs to the solution of combustion in the furnace. Although it can improve the pollution and slagging problems of the boiler to a certain extent, it also increases the wear and tear of the boiler, affects the service life of the boiler and reduces the calorific value of coal, which is necessary Increase construction investment and operating costs of power plants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The high-sodium coal intermittent desodium purification method of the present embodiment has the following steps:

[0037] S1. Put the high-sodium coal raw coal with a diameter of 3-30mm and the aqueous washing solution into the purification container at the same time. In the purification container, the volume of the aqueous washing solution is 3 times the volume of the high-sodium coal; the aqueous washing solution contains mass 8% hydrochloric acid;

[0038] S2, sealing the purification container;

[0039] S3, adding hot water into the airtight purification container, and raising the temperature of the airtight purification container to 200°C and the pressure to 4Mpa;

[0040] S4, then stabilize for 2 minutes, then cool down to 50°C, and drop the pressure to 0.1Mpa;

[0041] S5. After another 3 minutes, the temperature will be raised to 200°C, and the pressure will be increased to 4Mpa;

[0042] S6, repeat above-mentioned steps S4 and S5 totally 5 times;

[0043] ...

Embodiment 2

[0046] The high-sodium coal intermittent desodium purification method of the present embodiment has the following steps:

[0047] S1. Put the high-sodium coal raw coal with a diameter of 3-30mm and the aqueous washing solution into the purification container at the same time. In the purification container, the volume of the aqueous washing solution is 5 times the volume of the high-sodium coal; the aqueous washing solution contains mass 15% acetic acid;

[0048] S2, sealing the purification container;

[0049] S3, adding steam into the airtight purification container, so that the temperature of the airtight purification container rises to 350°C and the pressure rises to 5Mpa;

[0050] S4, then stabilize for 3 minutes, then cool down to 60°C, and drop the pressure to 0.1Mpa;

[0051] S5. After another 5 minutes, the temperature will be raised to 350°C, and the pressure will be increased to 5Mpa;

[0052] S6. Repeat the above steps S4 and S5 for a total of 8 times.

[0053] ...

Embodiment 3

[0056] The high-sodium coal intermittent desodium purification method of the present embodiment has the following steps:

[0057] S1. Put the high-sodium coal raw coal with a diameter of 3-30mm and the aqueous washing solution into the purification container at the same time. In the purification container, the volume of the aqueous washing solution is 5 times the volume of the high-sodium coal; the aqueous washing solution contains mass 10% hydrochloric acid;

[0058] S2, sealing the purification container;

[0059] S3, adding steam into the airtight purification container, so that the temperature of the airtight purification container rises to 150°C and the pressure rises to 3Mpa;

[0060] S4, then stabilize for 2 minutes, then cool down to 30°C, and drop the pressure to 0.5Mpa;

[0061] S5. After another 5 minutes, the temperature will be raised to 150°C, and the pressure will be increased to 3Mpa;

[0062] S6. Repeat the above steps S4 and S5 for a total of 6 times.

[00...

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Abstract

The invention discloses an intermittent sodium removal and purification method for high-sodium coal. According to the method, the temperature and pressure intensity in a reaction vessel are changed multiple times, so that high-sodium coal is compressed and expanded multiple times in the purification vessel under the action of violent change of the temperature and pressure, the structural balance of the raw coal is destroyed repeatedly, sodium and other alkali metals in the surfaces and capillary bores of the high-sodium coal can quickly migrate and be dissolved, and a large amount of elements (such as alkali metals, including sodium, potassium, mercury and sulfur) and ashes migrate or are dissolved in a water-based washing solution, thereby achieving the purpose of upgrading and purifying the raw coal.

Description

technical field [0001] The invention belongs to the field of coal cleaning, in particular to a high-sodium coal desodium purification method. Background technique [0002] High-sodium coal refers to a special type of coal with a high content of alkali metal compounds in coal. Among all kinds of alkali metal compounds, sodium-based compounds are generally in the majority, so it is called "high-sodium coal". The Zhundong coalfield in the eastern Junggar Basin of Xinjiang has a high content of alkali metals, so it is also a high-sodium coal. [0003] At present, the Zhundong Coalfield has a predicted reserve of 390 billion tons of resources, a proven reserve of 213.6 billion tons of coal resources, and a coal-forming area of ​​14,000 square kilometers. It is currently the largest integrated coal field in my country. Based on the current annual coal production in my country, one Zhundong coalfield can be used nationwide for a hundred years. [0004] The coal quality in Zhundon...

Claims

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Application Information

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IPC IPC(8): C10L9/00
Inventor 施大钟
Owner 上海机易电站设备有限公司
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