JPS629294Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an exhaust heat recovery device for a glass melting furnace.

Tank-type glass melting furnaces, which are currently widely used, are equipped with a heat storage chamber, and the structure is such that the thermal energy of the exhaust gas emitted from the glass melting furnace is recovered by a checker block inside the heat storage chamber. The exhaust gas that leaves the heat storage chamber and is sent to the chimney is still at a temperature of 500 degrees or more.
The temperature of the exhaust gas was 600 degrees, and the energy contained in the exhaust gas was wasted and was wasted into the atmosphere.

In order to solve this problem, the present inventor recovers the thermal energy of the exhaust gas by stacking firebricks in a lattice pattern inside the flue that connects the heat storage chamber and the exchanger installed at the base of the chimney. I tried that. However, the work of stacking refractory bricks inside the flue of an existing glass melting furnace requires a long period of time because the work must be done during a short period of about 20 minutes when the flue is on the ventilation side. It was also found that if the lower bricks were damaged due to thermal stress, the entire structure would collapse and block the flue, which would actually worsen the combustion efficiency of the furnace.

The present invention was developed in order to solve these conventional problems.The present invention was developed by installing a hollow tubular body made of refractory material inside the flue that connects the left and right heat storage chambers and the exchanger of the glass melting furnace. This system is characterized by stacking a large number of such gases and recovering the thermal energy of the exhaust gas that exits the heat storage chamber.

The present invention will be explained in more detail below with reference to illustrated embodiments.

The drawing is a perspective view showing an embodiment in which the present invention is applied to a side port type glass melting furnace, in which 1 is a melting section of the glass melting furnace, 2 is a heat storage chamber provided on the left and right sides of the melting section, and 3 is a melting section 1 and Port 4 connecting with heat storage chamber 2
is a flue. The flue 4 is for guiding exhaust gas discharged from the heat storage chamber 2 to the chimney 6 via the exchanger 5 and for sending combustion air to the heat storage chamber 2, and this switching is performed by the exchanger 5. It is generally known that In the present invention, a large number of hollow tubular bodies 7 made of refractory material are stacked on the left and right sides of the flue 4 near the heat storage chamber 2, and in the embodiment, the hollow tubular bodies 7 have an outer diameter.
Shamotsu refractories (SK35) with a diameter of 300 mm, an inner diameter of 250 mm, and a length of 900 mm were stacked in three tiers. Of course, the shape, number, and material of the hollow tubular bodies can be changed as appropriate depending on the size of the flue, and it is also possible to stack them in two or three rows in the longitudinal direction of the flue 4. .

With this structure, the hollow tubular body 7 inside the flue, which has become the exhaust gas side by switching the exchanger 5, is heated by the exhaust gas of 500 to 600 degrees discharged from the heat storage chamber 2 and becomes high temperature. When the exchanger 5 is switched to the ventilation side, the air passing inside or around the high temperature hollow tubular body 7 is preheated. Therefore, the combustion gas from the glass melting furnace heats the checker block in the heat storage chamber 2 and then further heats the hollow tubular body 7 inside the flue 4, and conversely, the combustion air heats the hollow tubular body 7.
Since the exhaust gas is preheated in two stages by the checker block and the checker block, sufficient thermal energy of the exhaust gas is given to the combustion air. According to the inventor's measurements, by adopting this invention, the fuel consumption of glass melting furnaces has been reduced by 1.5% to 2.5%, and it has been confirmed that the annual fuel cost reduction due to this will reach several million yen. It was done.

As explained above, the present invention stacks a large number of hollow tubular bodies made of refractory material inside the flue that connects the left and right heat storage chambers and the exchanger of a glass melting furnace. Because it is designed to recover the thermal energy it possesses, it is possible to reduce the amount of fuel used in the furnace as mentioned above, and unlike the conventional method of stacking firebricks, it can be installed and removed in a short time. It has the advantage that construction is simple and it can be easily applied to existing glass melting furnaces. Furthermore, since the present invention uses a hollow tubular body, there is little resistance to the flow of air, etc., and even if the lower hollow tubular body breaks and collapses due to thermal stress, other hollow tubular bodies will naturally collapse. Since it fills in the missing parts, it has the advantage of having little effect on the overall functionality.

As described above, the present invention satisfactorily solves the conventional problems and has extremely great practical value.

[Brief explanation of the drawing]

The drawing shows an embodiment of the present invention, and is a perspective view with a part of the flue cut away. 2... Heat storage chamber, 4... Flue, 5... Exchanger, 7
...Hollow tubular body.

Claims (1)

[Scope of utility model registration request] A hollow tubular body 7 made of refractory is installed inside the flue 4 that connects the left and right heat storage chambers 2 and the exchanger 5 of the glass melting furnace.
An exhaust heat recovery device for a glass melting furnace, characterized in that a large number of these are piled up and the thermal energy of the exhaust gas exiting the heat storage chamber 2 is recovered.