JPH0431953B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coal silo that prevents coal from freezing by utilizing the heat generated by mixing coal with air (oxidation heat of stored coal). It is something.

[Conventional technology]

Silos are used as facilities for storing large amounts of coal, grain, etc. A silo that adopts a first-in, first-out dispensing system is configured so that stored materials are brought in from above the silo and stored, and then sequentially dispensed from a dispensing port provided at the bottom using a conveyor.

Since oil shock, coal has been reconsidered as an alternative energy source to oil worldwide. Along with these environmental changes, coal silos for storing coal are being constructed in areas with more diverse environments and conditions than ever before.

[Problem that the invention seeks to solve]

Depending on the region, the stored material in the silo may freeze and form clumps during the winter, especially during the severe cold season, making it impossible to handle (dispense) the stored material, resulting in problems in which the stored material cannot be removed when needed. It was hot. Conventionally, in order to prevent such stored materials from freezing, it has been common to use heat insulating means, and for grain silos, this heat insulating means alone has been sufficient. However, in coal silos in cold regions, even if ordinary insulation measures are used, the coal will freeze inside the silo, and the results of experiments have shown that using only conventional insulation measures is insufficient.

In a coal silo that adopts a first-in, first-out system, the coal along the silo body begins to freeze at the top, and the coal at the discharge opening at the bottom begins to freeze. It is believed that freezing will occur. For this reason, a method of installing a heater around the dispensing opening at the bottom has been considered so far. However, it has been found that this method has drawbacks, such as high energy costs and the inability to prevent the coal from freezing at the top, which poses a problem when discharging the entire amount at once.

The present invention is based on the above considerations, and includes:
The object of the present invention is to provide a coal silo that can economically and efficiently prevent coal from freezing throughout the silo by utilizing stored carbonation heat.

[Means for solving problems]

To this end, the coal silo of the present invention that utilizes stored heat of carbonation to prevent freezing utilizes the phenomenon of heat generation when coal mixes with air.
In a coal silo for storing coal, air is formed between an insulating wall arranged inside the periphery of the bottom of the silo, and between the insulating wall and the inner wall of the silo, and is supplied from the bottom of the inner peripheral wall of the silo to cool the area around the bottom. An insulating space that feeds the coal into the stored coal from the upper end of the insulating wall after passing through, an air suction means that sucks air from the upper part of the inner peripheral wall of the silo, and controls the exhaust and outside air intake as well as the air volume to adjust the temperature. The air circulation control means is equipped with an air circulation control means that recirculates the air sucked from the air suction means to the bottom of the silo, and the air is fed into the coal from the bottom of the silo through the insulation space, sucked from the air suction means, and refluxed. The invention is characterized in that it is configured to prevent freezing of the water.

[Effect]

In the coal silo of the present invention, which prevents freezing by utilizing the stored heat of carbonation, air circulation control means supplies temperature-controlled air to the bottom of the silo and sends it into the coal through the heat insulating space. At this time, the temperature of the air is transferred to and warms the coal at the bottom of the silo through the insulating wall. At the same time, the insulation space isolates the coal at the bottom of the silo from the cooling heat of the outside air. Moreover, since air is sent into the coal from the bottom of the silo through the heat insulating space and sucked in from the top of the silo by the air suction means, it acts as a catalyst for heat generation in the coal and promotes heat generation in the coal. In other words, the overall effect is to prevent the coal from freezing by promoting heat generation in the coal by mixing air, and by circulating the air that has absorbed this heat back into the insulation space from the bottom of the silo, the area around the bottom of the silo, which is particularly prone to freezing, can be prevented from freezing. This is to prevent coal from freezing.

[Embodiments of the invention]

FIG. 1 is a diagram showing the configuration of one embodiment of the coal silo of the present invention, and FIG. 2 is a diagram illustrating the air flow cycle in the coal silo shown in FIG. 1. In the figure, 1 is the silo body, 2 is the suction chamber, and 3
is the fan, 4 is the filter, 5 is the duct, 6 is the outlet, 7 is the insulation wall, 8 is the insulation space, D _1
3 and D3 indicate a volume damper, and T indicates a temperature sensor, respectively.

The heat insulating wall 7 is provided around the outlet 6 and the bottom of the silo, and forms a heat insulating space 8 between it and the inner wall of the silo body 1. The bottom portion is connected to the air supply section B, and the top end is provided with an air supply port A. The suction damper 2 is installed in the upper part of the silo main body 1, and sucks the air sent into the coal from the air supply port A through the heat insulation space 8. The air sucked here is sent by the fan 3 through the filter 4 to the air supply section B at the bottom. Volume dampers D ₁ to D ₃ control the supply of exhaust gas EX and outside air OA.
So, for example, if you close volume damper D ₁ and volume damper D ₂ , open volume damper D ₃ only, and operate fan 3,
The air is all returned, and is sent into the coal from the filter 4, through the fan 3, the duct 5, and the heat insulating space 8, as shown in FIG. The coal generates heat when mixed with air, and the air that has absorbed the heat is sucked by the suction chamber 2 and returned to the filter 4 and fan 3. Therefore,
When this air is further circulated through the duct 5 and into the insulation space 8, the air heated by the heat generated by the coal is sent into the insulation space 8.
The heat insulating wall 7 is heated by this air. In this way, air is mixed with the coal in the silo to promote heat generation of the coal, and the air heated by this heat generation is further utilized to utilize the outlet port 6, which is particularly prone to freezing.
By heating the nearby heat insulating wall 7, it is possible to prevent the coal from freezing evenly throughout the bottom and top of the silo. When the material of the insulation wall 7 is stainless steel, for example, it has a high thermal conductivity and can effectively transfer the heat of the air passing through the insulation space 8 to the coal. It can make the flow smoother.

The volume dampers D ₁ to D ₂ are for temperature control, and by increasing the supply of exhaust gas EX and outside air OA, the temperature of the air to be circulated can be lowered. Further, by making the fan 3 variable speed, the air volume can be adjusted by reducing the speed, for example, when a large amount of air is mixed. For temperature control and air volume control, a temperature sensor T is installed.
It goes without saying that various methods can be adopted, for example, by setting reference values and comparing them. Furthermore, insulation space 8
The air outlet that sends air into the coal can also be divided into several stages, as shown in the dashed line in Figure 1A, or the air outlet can be extended inward (not shown) so that the air can flow through the coal. It may be deformed so that it is fed into the coal on average.

Since coal has the risk of spontaneous combustion, it goes without saying that sufficient measures must be taken to prevent it from igniting. To prevent ignition, for example,
As shown in Figure 1, a temperature sensor T and other various sensors are installed to constantly monitor the presence or absence of a risk of ignition, and the volume damper and fan can be controlled in advance to adjust the amount of air supplied. Possible countermeasures include adjusting the temperature of the air, operating conventional water spray equipment, etc.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the ``phenomenon of heat generation when coal mixes with air'', which was conventionally promoted by bad elements as a cause of spontaneous combustion, is utilized to ignite the air. The coal is circulated to generate heat, and the air that absorbs that heat is used to warm the coal, so it only requires the power to drive the fan, making it more economical than installing a heater.
In addition, it is possible to efficiently prevent the coal in the silo from freezing, and the energy saving effect is also large.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of one embodiment of the coal silo of the present invention, and FIG. 2 is a diagram illustrating the air flow cycle in the coal silo shown in FIG. 1. 1...Silo body, 2...Suction chamber, 3...Fan, 4...Filter, 5...Duct, 6...Discharge port, 7...Internal insulation wall, 8...Insulation space, D ₁
Or D ₃ ...Volume damper, T...Temperature sensor.

[Claims]

1 In a coal silo for storing coal, an air supply means having a suction chamber installed at the top of the silo and a plurality of air supply ports extending downward into the silo and feeding air into the coal, and an air supply means that sucks air from the top of the silo. A suction means, and an air circulation means that controls the exhaust and outside air intake, controls the air volume, adjusts the temperature, and circulates the air sucked from the air suction means to the air supply means, and supplies air from the air supply port to the coal. 1. A coal silo which prevents freezing by utilizing stored heat of carbonation, characterized in that the coal is prevented from freezing by sucking the air into the silo from an air suction means and circulating it.