Coal slime non-quantification process for classifying and selecting viscous and wet power coal

Abstract

The invention belongs to the technical field of power coal separation and coal slime non-quantification, and discloses a coal slime non-quantification process for classifying and selecting viscous and wet power coal. The system comprises a raw coal screening and grading module, a lump coal separation module, a slack coal deep powder removal module, a slack coal separation module, a coal slime dehydration module, a drying module and a blending module which are arranged in the coal flow direction. The method can effectively realize grading separation of lump coal and slack coal, improves the raw coal separation rate and separation precision, reduces the separation lower limit, and improves the clean coal yield. The problem that sticky and wet fine coal adheres to the inner wall of the coal bunker, and consequently the coal bunker catches fire is solved. The economic value of the coal slime product is greatly improved, coal slime emission is not quantized, the economic benefit of a coal preparation plant is maximized, and environmental protection, energy conservation and emission reduction are facilitated.

Description

technical field

[0001] The patent of the invention belongs to the technical field of steam coal separation and coal slime non-quantification, and specifically relates to a coal slime non-quantification process for viscous-wet steam coal classification and selection. Background technique

[0002] Coal is an important primary energy source in my country and plays an important role in the development of the national economy. Coal sorting is the key link to realize the clean and efficient utilization of coal, which is of great significance to energy saving, emission reduction and environmental protection.

[0003] At present, thermal coal preparation plants mostly use 13mm or 6mm classification, > 6 (13) mm raw coal is sorted through a shallow tank dense medium separator, < 6 mm raw coal is directly sold as a product, and the coal slime is sold directly after dehydration, resulting in raw coal Low selection rate, poor sorting accuracy, high sorting lower limit, low clean ...

Examples

Embodiment 1

[0042] Raw coal screening and grading module: such as image 3 As shown, the raw coal is classified by the raw coal grading sieve, the material larger than the sieve size becomes the oversize material, and the material smaller than the sieve size becomes the undersize material, the oversize material enters the lump coal separation module, and the undersize material enters the fine coal depth Powder removal module. The screen surface can be a rigid screen surface, or a rigid-flexible coupling elastic screen surface, and the mesh size of the raw coal grading screen can be selected from one of 50mm, 25mm, and 13mm;

[0043] Lump coal separation module: such as Figure 4 As shown, the material entering this module is the raw coal > 50 (or 25 or 13) mm on the raw coal sieve in the raw coal sieving and grading module, and the > 50 (or 25 or 13) mm raw coal enters the lump coal shallow groove for dense medium separation Sorting is carried out in the sorting machine, and the light p...

Embodiment 2

[0052] The difference between this embodiment and embodiment 1 is that the drying module and the blending module, other modules are all the same as in embodiment 1, and the specific implementation methods are as follows:

[0053] Drying module: When the moisture content of the pulverized coal entering the fine coal drying module is low, it can be directly sold as a product without drying; the coal slime from the coal slime dehydration module enters the drying module for drying. Crushing is carried out, and then dried, and the dried product enters the blending module. The drying equipment used in the drying module may be one of a rotor dryer and a rotary drum dryer.

[0054] Blending module: The coal slime from the drying module is transported by the belt, and all of it is blended into lump clean coal and fine coal products as products for sale, or directly blended into pulverized coal as products for sale; a part of it can also be blended into lump coal Part of clean coal and...

technical field

[0001] The patent of the invention belongs to the technical field of steam coal separation and coal slime non-quantification, and specifically relates to a coal slime non-quantification process for viscous-wet steam coal classification and selection. Background technique

[0002] Coal is an important primary energy source in my country and plays an important role in the development of the national economy. Coal sorting is the key link to realize the clean and efficient utilization of coal, which is of great significance to energy saving, emission reduction and environmental protection.

[0003] At present, thermal coal preparation plants mostly use 13mm or 6mm classification, > 6 (13) mm raw coal is sorted through a shallow tank dense medium separator, < 6 mm raw coal is directly sold as a product, and the coal slime is sold directly after dehydration, resulting in raw coal Low selection rate, poor sorting accuracy, high sorting lower limit, low clean ...

Examples

Embodiment 1

[0042] Raw coal screening and grading module: such as image 3 As shown, the raw coal is classified by the raw coal grading sieve, the material larger than the sieve size becomes the oversize material, and the material smaller than the sieve size becomes the undersize material, the oversize material enters the lump coal separation module, and the undersize material enters the fine coal depth Powder removal module. The screen surface can be a rigid screen surface, or a rigid-flexible coupling elastic screen surface, and the mesh size of the raw coal grading screen can be selected from one of 50mm, 25mm, and 13mm;

[0043] Lump coal separation module: such as Figure 4 As shown, the material entering this module is the raw coal > 50 (or 25 or 13) mm on the raw coal sieve in the raw coal sieving and grading module, and the > 50 (or 25 or 13) mm raw coal enters the lump coal shallow groove for dense medium separation Sorting is carried out in the sorting machine, and the light p...

Embodiment 2

[0052] The difference between this embodiment and embodiment 1 is that the drying module and the blending module, other modules are all the same as in embodiment 1, and the specific implementation methods are as follows:

[0053] Drying module: When the moisture content of the pulverized coal entering the fine coal drying module is low, it can be directly sold as a product without drying; the coal slime from the coal slime dehydration module enters the drying module for drying. Crushing is carried out, and then dried, and the dried product enters the blending module. The drying equipment used in the drying module may be one of a rotor dryer and a rotary drum dryer.

[0054] Blending module: The coal slime from the drying module is transported by the belt, and all of it is blended into lump clean coal and fine coal products as products for sale, or directly blended into pulverized coal as products for sale; a part of it can also be blended into lump coal Part of clean coal and...

Images