JPS5945394A - Preparation of coal oil mixture - Google Patents

Abstract

PURPOSE:Not to discharge coal oil mixture unsuitable for quality such as particle size, etc., to shorten preparatory time in starting, to raise the utilization efficiency of plant, by grinding and blending coal again by the same device oil mixture fuel obtained by grinding coal in oil, raising the temperature of the mixture, grinding it. CONSTITUTION:The device 1 for grinding and blending is charged with coal and oil in a blending ratio usually to give 50% dry coal concentration, the coal is ground and blended with the oil, the total amount of the coal oil mixture is circulated through the circulation path 9 to the device 1, treatment of grinding and blending is carried out again for a proper time, the circulation is stopped and steady operation is started. At this point, the mixture is raised to the given temperature by accumulative heat of grinding heat, etc., and the coal is ground into the target particle size, to give the desired coal oil mixture fuel. If necessary, a precipitation inhibitor is added to the mixture by the path blender 4, to prevent clogging in the circulation path 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a coal/oil mixed fuel by pulverizing coal in oil.

The above-mentioned coal/oil mixed fuel (Coal Oil Mixt)
The conventional manufacturing method for manufacturing ure is that, using a device as shown in Fig. 1, coal at room temperature and oil heated to 150 to 200°C by a heater not shown are separately fed into a pulverizing and mixing device (1). The coal is ground to a predetermined particle size using the grinding medium (steel balls, etc.) filled in the grinding and mixing device (1), and the coal/oil mixed fuel is heated to a temperature of 70~70°C. The temperature range is set at around 90°C, and the coal/oil mixed fuel passes through a collect tank (2), a pump (3), and a pipe mixer (4). After anti-sedimentation chemicals are added in front of the tank (system diagram omitted), they are strongly mixed by the pipe mixer (4), and in steady state they are supplied to the storage tank (5) and used as fuel. It has become.

However, at the beginning of the operation of the device, the main body of the grinding and mixing device (1) and the grinding media inside are not sufficiently heated up, so the temperature at the outlet side of the grinding and mixing device (1) does not reach a steady state. , sufficient pulverization is not carried out, resulting in a coal/oil mixture with large particle size.

The particle size of the coal/oil mixed fuel (coal) may change depending on the user's conditions, but it is 200 mesh pass (
75 μ or less) 70 to 8.0% is one target value.

When operating at a constant production volume, a coal/oil mixture (of unreliable quality) that does not reach the target particle size is produced in the early stages of operation. ) is led to a separate tank (6) and is not used as a product. The time during which the above-mentioned steady temperature is not reached at the beginning of the operation of the device, that is, the time during which a coal/oil mixture that does not reach the target particle size is formed, may vary somewhat depending on the conditions, but it takes about 1 to 3 hours.

As described above, the conventional production method has the drawback of inevitably producing a coal/oil mixture with an inaccurate coarse particle size.

The present invention was developed in order to eliminate the above-mentioned drawbacks of the conventional method for producing a coal/oil mixed fuel. In a device for producing oil-mixed fuel, the coal processed by the pulverizing and mixing device of the device at the initial stage of operation of the device is
The second invention is characterized in that the oil mixture is circulated to the surface of the pulverization and mixing device, reprocessed, heated to a predetermined temperature, and pulverized to produce a coal/oil mixed fuel. The second invention is characterized in that the coal/oil mixture treated by the pulverizing mixer and the pipe mixer of the apparatus at the initial stage of operation is circulated to the pulverizing and mixing apparatus for reprocessing,
Their purpose is to circulate and reprocess the coal/oil mixture that has not reached the target particle size that occurs during the initial operation of the unit, to reduce the coal/oil mixture, and to A method for producing a coal/oil mixed fuel that further improves the above-mentioned effects by utilizing the crushability of the machine and the crushing heat, allowing the device to reach a steady state in a short time, and significantly improving the utilization efficiency and operating performance of the plant. The point is that it provides

The present invention has the above-mentioned configuration, and in the initial stage of operation of a device for pulverizing coal in oil and producing a coal/oil mixed fuel, the coal processed by the pulverizing and mixing device of the device.
The oil mixture is circulated to the grinding mixer for reprocessing.
The internal temperature of the pulverization and mixing device quickly rises to a predetermined temperature due to the accumulation of pulverization heat, etc., and the entire amount of the circulating coal/oil mixture is pulverized to the target flow rate, eliminating unsuitable products and quickly transitioning to continuous steady operation. As a result, manufacturing efficiency and equipment operating performance are significantly improved.

In addition, in the present invention, the coal/oil mixture processed in the pulverization mixer is strongly mixed by the pipe mixer, and then circulated to the pulverization mixer for reprocessing. is pulverized by the pipe mixer and its pulverization heat is added, thereby accelerating the temperature rise in the pulverization mixer and the pulverization function, so that a steady state can be reached in a shorter time.

Embodiments of the present invention will be described below with reference to the drawings. Second
The figure shows the equipment system used in the first embodiment of the production method of the present invention, and in a steady state, coal is crushed to a target particle size in oil in the crushing mixer (1) and becomes a coal/oil mixed fuel. This coal/oil mixed fuel passes through a collect tank (2) and a pump (3), and a chemical for preventing sedimentation is added just before the pipe mixer (4).
4), and stored in a storage tank (5) to be used as fuel; The coal/oil mixture that has not yet reached the target particle size that is produced when the particle size It is circulated through the pipe (8) to the grinding mixer (
1), it can be fried, heated to a predetermined temperature, and then pulverized.

To explain in detail the manufacturing method of the first embodiment in the above-mentioned device, when starting the operation of the pulverizing and mixing device (1), coal and oil (heavy oil) are first mixed in the pulverizing and mixing device according to a predetermined mixing ratio (usually a dry coal concentration of 50%). Load only the amount corresponding to the hold amount in (1).

Thereafter, the supply of coal and oil is stopped, and the entire set amount is circulated from the rear of the pump (3) through the circulation path (9) into the crushing and mixing device (1) for reprocessing, that is, crushing and mixing. do.

After circulating for a suitable period of time, when the predetermined temperature and flow rate are reached, the continuous supply of coal and oil is started again, and the circulation through the circulation path (9) is stopped and steady operation begins. The circulating coal/oil mixture at the above point is heated to a predetermined temperature due to heat accumulation such as crushing heat, and is pulverized to the target flow rate to become the desired coal/oil mixture fuel, resulting in an unsuitable product. emissions are almost eliminated.

Furthermore, FIG. 3 shows the equipment system used in the second embodiment, in which the coal-oil mixture is processed by the pulverizing mixer (1) and further strongly mixed by the pipe mixer (1). It is characterized in that the coal is reprocessed by being circulated to the crushing and mixing device (1) via a circulation path (9') branched from the wood pipe (7'). Because the oil mixture is strongly mixed by the pipe mixer,
As the heat of pulverization and pulverization is added due to the mixing, this contributes to the temperature increase and improvement of pulverization in the pulverization mixer (1), allowing the equipment to reach the specified temperature and particle size in a shorter time than the initial amount of operation. , steady-state operating conditions can be reached faster. That is, the preparation time at start-up can be significantly shortened without producing unsuitable products, and the utilization efficiency and operating performance of the plant can be greatly improved.

Further, in the case of the second embodiment, clogging in the circulation path (9') can be prevented by adding an anti-sedimentation chemical if necessary and mixing it with the pipe mixed acid (4).

The above explanation is for the case where the temperature and particle size at the outlet side of the grinding mixer (1) reach a steady state at the same time due to circulation operation, but depending on the set temperature or other conditions, the steady state values may not be satisfied at the same time. .

Normally, the temperature increase rate is slower, so when the coal/oil mixture reaches the set temperature, the particle size may become smaller than the set value. This is not a problem, and the storage tank (
5) No inconvenience will occur even if it is mixed with other mixed coal/oil fuels. If the grain size is coarse, tank. It can accumulate in piping and cause trouble, but in this case it is hardly a problem.

Although it is possible to reach a steady state by reducing the production amount during the initial stage of operation of the equipment, it is necessary to control the supply amount of coal and oil depending on the temperature rise state.
On-line monitoring of particle size is practically impossible for such suspensions.

According to the embodiment of the present invention as described above, the objective can be sufficiently achieved by monitoring the temperature of coal and oil, and there is no problem in terms of drivability.

Specific Example A circulation test according to the second embodiment (FIG. 3) was carried out using an apparatus capable of producing 3 T/H of coal/oil mixed fuel. As shown in Figure 4, the temperature of the coal/oil mixture reached the set temperature of 90°C after about 3 hours, while the particle size was about 90% of the target value (200 mesh pass 80%). It was found that an atomized coal/oil mixed fuel was produced. After 3 hours, the circulation operation was stopped and regular supply of coal and oil was started, but in that case, the predetermined particle size (200 mesh pass 80%) was reached after about 40 minutes. During this time, the oil was maintained at the set temperature, so the temperature of the coal-oil mixed fuel remained at a constant temperature of 90° C. after 3 hours.

By passing through the pipe mixer (4) (30KW) during circulation, the temperature was increased by about 6°C, and the effect of pulverization and temperature increase could be confirmed.

In addition, there was no coal-oil mixture that did not reach the target particle size generated by this experiment, whereas in the conventional production method, it reached 10 to 15 tons, so there was no coal-oil mixture that did not reach the target flow rate. Reduced processing volume, material costs (
The effect of reducing emissions (coal, oil) is remarkable.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Figure 1 is a vertical diagram of a conventional coal/oil mixed fuel manufacturing equipment system.
Fig. 2 is a system diagram of the manufacturing equipment used in the manufacturing method of the first embodiment of the present invention, Fig. 3 is a system diagram of the manufacturing equipment used in the manufacturing method of the second embodiment, and Fig. 4 is a system diagram of the manufacturing equipment used in the manufacturing method of the second embodiment. FIG. 3 is a performance chart showing the results of a circulation test. 1: Grinding and mixing device 2: Collect trunk 3: Pump 4
: Pipe mixer 5: Storage tank 6: Tank 9, 9': Circulation path

Claims (2)

[Claims] (1) In a device that produces a coal/oil mixed fuel by crushing coal in oil, the coal/oil mixture processed by the crushing and mixing device of the device is circulated to the crushing and mixing device during the initial operation of the device. A method for producing a coal/oil mixed fuel, which is characterized in that the coal/oil mixed fuel is produced by reprocessing, raising the temperature to a predetermined temperature, and pulverizing the coal/oil mixed fuel. (2) In an apparatus for producing a coal/oil mixed fuel by pulverizing coal in oil, the coal/oil mixture processed by the pulverizing mixer and the pipe mixer of the apparatus at the initial stage of operation of the apparatus is A method for producing a coal/oil mixed fuel, which is characterized in that the coal/oil mixed fuel is produced by circulating it in a pulverization mixing device, processing it internally, raising the temperature to a predetermined temperature, and pulverizing it.