JPH0141881B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot air generating furnace, and more particularly, to a hot air generating furnace that is effective when applied to a firing furnace for burning pulverized coal to burn limestone and the like.

As oil prices rose, it became necessary to switch to coal, which is cheaper and has a more stable supply.

However, depending on the application, for example, when coal stone is fired, the fired coal ash may be mixed into the product, reducing quality, or when the temperature is high, the coal ash may cause sticking. Therefore, it became necessary to eliminate coal accumulation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot air generating furnace configured to eliminate coal ash and the like.

The details of the present invention will be explained below along with embodiments shown in the drawings.

FIG. 1 and subsequent figures are for explaining one embodiment of the present invention. In the figures, what is designated as a whole by the reference numeral 1 is a hot blast furnace. In the present invention, the hot blast furnace is constructed as a cyclone type hot blast furnace, and its body is 2 is formed into a funnel shape that becomes narrower toward the lower end, and the lower end is a dust outlet 3, and the lower end of this outlet 3 is an outlet 4 equipped with a damper that can seal gas. .

A tertiary air inlet 5 is provided on the side surface of the upper end of the body 2 and is connected to a fan 7 via a pipe 6.

A hot air outlet 8 having a double hollow tube structure is integrally provided at the upper end of the body 2 of the hot air generating furnace 1, and a middle cylinder 9 is fitted into the hollow part of the hot air outlet 8. .

The body 2 of the hot air generating furnace 1 is lined with bricks, the middle cylinder 9 is also lined with bricks, and a partition plate 10 is appropriately provided inside as shown in FIG. configured to be retrieved.

On the other hand, the tertiary air inlet 5 is arranged tangentially to the body 2 as shown in cross section in FIG. A burner 11 is provided,
This burner 11 is supplied with pulverized coal.

Incidentally, as shown in FIG. 1, one end of the middle cylinder 9 is provided with a cooling air inlet 13 by a fan 12, and the other end is provided with a cooling air outlet 14.
This cooling air outlet 14 is connected to the secondary air intake 11a of the burner 11 via a pipe 15.

A thermometer 16 made of a thermocouple or the like is provided near the outlet end of the hot air outlet 8 to detect the temperature of the hot air outlet.

Next, the operation of this embodiment configured as above will be explained.

A flame of pulverized coal burned by the burner 11 is ejected tangentially to the body 2 of the hot air generating furnace 1. Burner 11 has pulverized coal with an air content
It is blown into the middle cylinder 9 with high pressure air at about 0.1
The cooling air is used as secondary air for combustion.

On the other hand, tertiary air is tangentially fed into the body 2 at a predetermined pressure, and the combusted pulverized coal is subjected to a cyclone effect by the swirling airflow, and is blown toward the inner circumference of the body 2, causing the wall surface to It then descends and collects at the dust outlet 3. Then, it is taken out from the gas-sealed discharge port 4.

Incidentally, since the dust outlet 3 is provided eccentrically with respect to the body 2 as shown in FIG. 1, the structure is such that the accumulated coal ash is not heated by the radiant heat of the hot air stove.

In addition, as another example, what is shown in FIG.
A heat shield 17 is provided above the discharge port 4 to prevent radiant heat from hitting the accumulated coal ash.

This heat shield 17 is located below the inside of the body 2,
This is to prevent radiant heat from being applied to the coal debris deposited on the upper portion of the discharge port 4, and is located above the portion where the coal debris is deposited.
In addition, it is provided in the center of the interior of the body 2 so as not to be a hindrance when the coal ash descends while turning along the inner wall of the body 2.

Furthermore, the combustion gas from the burner is combusted and diluted by tertiary air blown into the furnace. The hot air is taken out from the hot air outlet 8 as an updraft, and its temperature is controlled by a thermometer 16.
If there are fluctuations above or below the set temperature,
This is done by adjusting the amount of pulverized coal blown into the burner 11 and the amount of secondary air supplied.

As is clear from the above explanation, the structure of the hot air generating furnace is a cyclone type, so the coal debris after combustion can be reliably separated and taken out to the outside, so there is less mixing of the coal debris with the product, and the coal debris can be reliably separated. Coal accumulation can be removed. Further, it is possible to prevent dust such as coal debris accumulated at the lower part of the body of the hot air generating furnace from being heated and to prevent it from sticking, and the dust such as coal debris can be smoothly discharged. Therefore, the hot air generating furnace using pulverized coal combustion can be smoothly operated.

[Brief explanation of drawings]

The figure explains one embodiment of the present invention.
The figure is a vertical side view, Figure 2 is a cross-sectional view taken along the line A-A in Figure 1, Figure 3 is an explanatory diagram showing the structure of the inner cylinder, and Figure 4 is a vertical side view of another example of dust extraction. be. 1... Hot air generating furnace, 2... Body, 3... Dust outlet, 4... Discharge port, 5... Tertiary air outlet, 7, 12... Fan, 8... Hot air outlet,
9...middle cylinder, 10...partition wall, 11...burner, 17...heat shield.

Claims (1)

[Claims] 1. In a hot air generating furnace that burns pulverized coal or the like to generate hot air, the shape of the hot air generating furnace is a cyclone type, and a tertiary air intake and a burner for burning the pulverized coal are provided. It is installed so that it is tangential to the head of the hot-air generator, and a dust outlet is provided at the lower end of the body of the hot-air generator in an eccentric manner from the body, so that the dust accumulated at the bottom of the body can be removed. A hot air generating furnace characterized in that it is not heated by the radiant heat of the hot air generating furnace. 2. In a hot air generating furnace that generates hot air by burning pulverized coal, etc., the shape of the hot air generating furnace is a cyclone type, and the tertiary air intake and the burner that burns the pulverized coal are located at the head of the hot air generating furnace. At the same time, a heat shield is installed in the center of the lower part of the body above the outlet at the lower end of the body of the hot-air generating furnace, so that the dust accumulated in the lower part of the body is removed from the hot air. A hot air generating furnace characterized in that it is not heated by the radiant heat of the generating furnace.