JPS6164791A - Upgrading of low-grade coal - Google Patents

Abstract

PURPOSE:To produce continuously and efficiently a high-grade coal of stable quality, by continuously cooling a low grade coal dried and rendered hydrophobic, adsorbing tar, and recooling a reformed coal. CONSTITUTION:A low-grade coal 1 is dried i a drying step 2 and is then carbonized at about 250-450 deg.C to be rendered hydrophobic in a carbonization step 3. In a cooling step 4, the carbonized coal is cooled to a temperature not lower than 70 deg.C (preferably 70-100 deg.C). In an adsorption step 5, the tar produced in the carbonization step 3 is adsorbed by the carbonized coal. In a recooling step 6, the reformed coal thus obtained is cooled to a temperature of 50 deg.C or lower to give a high-quality reformed coal 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for improving the quality of low-rank coal.

(Background of !l Ming) As a method to prevent spontaneous combustion and moisture absorption by attaching oil to dry charcoal, R, CoElm Hataken, etc. (+--
--,H,H@,,1. T1+pwlns of
1. tsw Tl5nkWestern Coa
After oil spraying as described in LM, after cooling on a conveyor and then performing a freight car transportation test, or as introduced in the Coal Enrichment System catalog, after cooling with air in a fluidized bed cooler. There are examples of oil spraying inside paddle mixers. Also,
Chem is a method of cooling carbonized coal using cooling water.
ical Englaering (197B-3
Koppelmi as introduced by -27)
An example is n processes.

As mentioned above, there are some examples of oil coating and cooling, but it is possible to cool the carbonized coal while adsorbing the tar generated from the carbonized coal, and further raise the temperature to a temperature that can prevent spontaneous combustion. There is no description of a consistent system for obtaining reformed coal after controlling it.

Purpose of C5i Light] The purpose of the present invention is to consistently perform cooling of dry and hydrophobized low-rank coal, adsorption of tar, and re-cooling of reformed coal, thereby producing stable modified coal and improving its color. The objective is to provide a high-quality method for producing low-rank coal.

△ [Summary of the invention] The present invention uses dry, hydrophobized low-rank coal (hereinafter referred to as "low-rank coal").

The carbonized coal (abbreviated as carbonized coal) is cooled to a temperature of 70°C or higher, and the tar distilled from the low-rank coal during hydrophobization of the low-rank coal is adsorbed to the carbonized coal cooled to that temperature, and then the reformed coal is heated to a temperature of 70°C or higher. 50℃
It is characterized by the following recooling: cooling of carbonized coal, adsorption of tar to the cooled carbonized coal, and recooling of reformed coal.

The cooling of the carbonized coal for tar adsorption and the re-cooling of the reformed coal storage tank are related, and stable reformed coal can be produced.

[Embodiments of the Invention] An embodiment of the present invention will be described below with reference to Figures 9J1 to %3.

Figure 'lJ1 is a flowchart showing the steps of the process for improving the quality of low-rank coal according to the present invention, in which low-rank coal 1 is dried in drying step 2 and then carbonized in carbonization step 3 to be hydrophobized. Then in cooling step 4.

It is cooled to a temperature suitable for adsorbing the tar generated from carbonization step 3, and then it is continued in adsorption step 5! Adsorb e-tar and J! In a re-cooling step 6, the coal is re-cooled to a temperature that does not cause spontaneous combustion even if it is stacked as it is, to produce reformed coal 7.

The present invention relates to the process between cooling step 4 and recooling step 6 in this flow.

First, the conditions for cooling step 4 are carbonized coal that has been carbonized at a temperature between 250 and 450°C, and heated to a temperature of 70°C, which is suitable for tar adsorption.
As mentioned above, it is preferable to cool to a temperature around 7G-100°C.

The conditions for the adsorption step 5 are to adsorb the supplied tar onto the carbonized coal as efficiently as possible.

The conditions for re-cooling step 6 are such that when the reformed coal with tar adsorbed is loaded, the temperature will rise and spontaneous combustion will occur. 5 charcoal
Keep the temperature below 0℃.

! l! Figure 2 is a structural diagram of an apparatus incorporating the method of the present invention, in which co-fed carbonized coal 8 is sent sequentially by a screw s9,
After the steps of cooling, adsorption, and recooling, the reformed coal 10 is discharged. Cooling water for cooling is supplied from the water supply port 11,
Water is drained from the drain port 13 via the inside of the jacket.

The same goes for cooling water for re-cooling.

Water supply port 14. Jacket 15. Take the route of the drain 16.

Tar enters through the inlet 1 or 4 and is adsorbed to carbonized coal 8 in the feeder chamber. Then, excess tar is discharged from the outlet 19. The screw 9 is composed of sections 20 to 23 made of curved plates and ribbon-shaped sections 24 to 26 having only an outer periphery. Carbonated charcoal 8
The line 4 degrees passes through a section made of a curved plate at a filling rate of 10 to 20 degrees, and a ribbon-shaped section at a filling rate close to 100 degrees. 4 in the figure, tar enters from the inlet 17 and is adsorbed by the carbonized coal while passing through the carbonized coal filled part 27. And the excess tar is exit 1
It is discharged from 9.

In this embodiment, the following effects can be obtained.

(Since cooling of the 11# recoal, tar adsorption to the cooled carbonized coal, and cooling of the reformed coal are performed consistently, stable reformed coal can be produced.

(2) Cooling of carbonized coal, tar adsorption to the cooled carbonized coal, and bath cooling of reformed coal can be performed continuously in -at.

【Effect of the invention〕

According to the present invention, tar generated during carbonization can be efficiently adsorbed onto carbonized coal, and furthermore, after that, J! Because reformed coal can be produced in a cooled state.

This has the effect of producing stable modified coal.

[Brief explanation of the drawing]

! l! Figure 1 is a process flow diagram showing an example of the method for improving the quality of low-rank coal of the present invention, and Figure 2 is a wLIj used in the cooling step, adsorption step, and recooling step of Figure 1.
Fig. 3 is a schematic diagram showing the state of coal filling in the apparatus of 2). 4... Cooling step, 5... Adsorption step, 6 Re-cooling step

Claims (1)

[Claims] 1. In the method of producing modified coal by drying and hydrophobizing low-rank coal, and then adsorbing the tar distilled from the low-rank coal during the hydrophobization into the dry and hydrophobized low-rank coal, The dry and hydrophobized low-rank coal is cooled to a temperature of 70°C or higher, and the tar is adsorbed to the dry and hydrophobized low-rank coal that has been cooled to the temperature, and then the modified coal is cooled to a temperature of 50°C. A method for improving the quality of low-rank coal, which is characterized by recooling as follows.