JPS62127388A - Method for regulating moisture of coal or drying coal - Google Patents

Abstract

PURPOSE:To conduct requlation and drying of coal with a small amt. of supply energy, by introducing wet coal into a surpersonic pulse channel to hydrate the coal and guiding the coal into a countercurrent heat exchange unit to heat- exchange with a high-temp. gas. CONSTITUTION:In feeding air and fuel through an air supply aperture 2 and a fuel supply aperture 3, respectively, the fuel is intermittently fed and undergoes combustion, thereby producing a supersonic pulse. In this condition, wet coal is fed from a wet coal supply aperture 5 into a channel 4. Since the speed of the supersonic pulse permeating the wet coal is greater than that of the supersonic pulse passing outside the wet coal, a difference occurs between the pressure within the wet coal and that outside the coal. Due to this pressure difference, the moisture of the wet coal is scattered outside the coal. After this first-step dehydration, the resulting coal is guided into a countercurrent heat exchange unit 6. The coal charged into the countercurrent heat exchange unit 6 is contacted with a waste gas to evaporate the moisture scattered from the coal, thereby completing drying of the coal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling humidity or drying coal to be charged into a coke oven, particularly in a steel manufacturing process.

[Prior art and its problems]

When charging coal into a coke oven, it is known that it is preferable to condition the humidity or dry the coal in advance, and various coal drying methods have been proposed and put into practical use. Of these,
The method of drying coal by burning fuel to create high-temperature gas and exchanging heat between the high-temperature gas and coal has the drawback of requiring a large amount of energy to be supplied. On the other hand, the flash drying method, which uses the sensible heat of coke oven exhaust gas to dry coal, uses exhaust gas from other processes and is therefore effective in terms of energy use. However, coke oven exhaust gas sensible heat alone is not sufficient to dry coal.

On the other hand, humidity control of coal is carried out using factory steam, coke oven exhaust gas sensible heat, or combustion heat of coal fuel, but in principle this is the same as drying and has the same problems.

[Purpose of the invention]

This invention has been made in view of the above circumstances, and its purpose is to provide a method that can control the humidity or dry coal with less supplied energy.

[Structure of the invention]

This invention involves a process of generating ultrasonic pulses with an ultrasonic cycle combustion device and introducing wet coal into the flow path of the ultrasonic pulses to perform the first stage dehydration. This is a method for controlling humidity or drying coal, which includes a second stage of dehydration by leading the wet coal to a countercurrent heat exchange section and exchanging total heat with the wet coal and high-temperature steam.

〔Example〕

The present invention will be described below with reference to all illustrated embodiments.

In the figure, reference numeral 1 indicates a somewhat Luss-based combustion injection, and the air supply port 2 is composed of a Luss-based fuel supply port 3. Then, when air and fuel are supplied from the air supply port 2 and the fuel supply port 3 respectively, fuel is intermittently supplied and combusted.
Create an ultrasonic pulse of about 0 to 30,000 Hz. In other words, high-pressure portions and low-pressure portions are alternately formed in the flow path 4 at the six frequencies described above. When wet coal is supplied from the wet coal supply port 5 to the flow path 4 in this state, the speed of the ultrasonic pulse passing through the wet coal is faster than the speed of the ultrasonic pulse passing outside the wet coal, so the pressure inside the wet coal A difference occurs between the pressure and the external pressure. As a result, the moisture contained in the wet coal is scattered out of the wet coal due to the pressure difference.

The coal that has been subjected to the first stage of dehydration in this manner is guided to the countercurrent heat exchange section 6. This countercurrent heat exchange section 6 has a lower inlet for exhaust gas from other processes, preferably coke oven exhaust gas, at the bottom, an outlet 8 for the exhaust gas at the Y4 section, and a coal input port 9 at the upper side. There is. The coal charged into the countercurrent heat exchange section 6 having this structure is brought into contact with the exhaust gas, and moisture scattered from the coal is evaporated to complete drying of the coal.

〔Effect of the invention〕

According to this invention, the amount of fuel used in the Mars combustion device is small because it is used to generate ultrasonic nozzles, and water may already be separated from the coal in the countercurrent heat exchange section. Fortunately, all you have to do is heat and evaporate only the water. Therefore, the amount of energy required to dry the coal can be reduced. The same thing can be said when controlling the humidity of coal.For example, according to the inventor's experiments, it was found that the amount of fuel used was about ≈ compared to the conventional drying method.

In addition, with the present invention, there is no need to dry coal at high temperatures as in the past, so processing time can be shortened.

[Brief explanation of drawings]

The drawing is an explanatory view showing an example of a coal humidity control or drying apparatus according to the method of the present invention. 1...Pulse combustion device, 2...Air supply port, 3...
・Fuel supply port, 4... Distribution path, 5... Wet coal supply port,
6... Heat exchange part, 7... Inlet, 8... Outlet,
9...Coal input port.

Claims (1)

[Claims] A pulse combustion device with an ultrasonic cycle generates ultrasonic pulses, and wet coal is introduced into the flow path of the ultrasonic pulses.
Coal comprising a step of performing stage dehydration, and a step of leading the wet coal that has been dehydrated in the first stage to a countercurrent heat exchange section and exchanging heat between the wet coal and high-temperature gas to perform second stage dehydration. humidity control or drying method.