JPS5840423A - Combustor - Google Patents

Abstract

PURPOSE:To contrive an improvement of a combustion state and combustion efficiency, by providing a supply pipe for air enriched with O2 along a specific side part of either a fuel injection pipe or a primary air ijection pipe. CONSTITUTION:A fuel injection pipe 12 is provided at the axis part of rotary kiln 11, and mixture of pulverized coal with air for transference is supplied to a fuel injection pipe by a fuel supply pipe 13, primary air is supplied by a primary air supply pipe 14, both of them are injected from the tip of the fuel injection pipe 12, and secondary air is supplied by a secondary air supply pipe 15 through a clinker box 16. Although air enriched with O2 is supplied by a supply pipe 17 for air enriched with O2, the supply pipe 17 is provided along a specific side part of the fuel injection pipe 12. With this, combustion exhaust gas quantity can be reduced, and then thermal efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion device that improves combustion conditions and combustion efficiency.

In recent years, the development of polymer membranes that allow more 02 to pass through among the 02 and N2 in the air has progressed. -02 enriched air of 35% to 40% can now be easily produced. For example, FIGS. 1 to 3 show an apparatus for producing 02 enriched air. Pressurized air is supplied into the tank 1 by a blower 2. The inner chamber 4 has N and 02 in the air on both sides.
It has a structure covered with polymer membranes 3, 3 that allow more O2 to permeate than N2, and an O2-enriched O2 concentration with an O2 concentration of 30% to 40% is emitted from the extraction pipe 5 communicating with the inner chamber 4. Air is obtained, blower 6. The supply pipe 7 allows the 02-enriched air to be pressure-fed to the user at an appropriate fan pressure. 8 is a pressure valve provided in the tank 1 to exhaust the inside of the tank while maintaining it at a predetermined pressure. Third
The figure shows six internal chambers 4, 4, . . . provided within one end.

The 02 enriched air obtained by the stolen enriched air production device is supplied to the combustion device according to the present invention.

For example, FIGS. 4 and 5 show a rotary kiln type cement kiln using pulverized coal as the firing material according to the present invention. A rotary kiln 11 is provided with a spouting pipe 12 in the center thereof, and a mixture of pulverized coal and transportation air of about 10% of the total amount of air is supplied to the spouting pipe through a sprinkling pipe 13.

Primary air, which accounts for approximately 10% of the total air volume, is pressurized to a high pressure of approximately 10001 water columns and is supplied by the primary air supply pipe 14, and both are blown out from the tip of the firing material jetting pipe 12, reducing the total air volume. About sob of secondary air is first supplied through the clinker box 16 by the secondary air supply pipe 15, heated to a high temperature of about 800°C by fired cement in the clinker box, and then supplied from around the fired material jetting pipe 12. be done.

In the case of the present invention, 02 enriched air is 02 enriched air supply pipe 1
7, the supply pipe 17 is connected to the firing pipe 1
approximately 10% of the total air volume.
A considerable amount of O2-enriched air is ejected by the supply pipe 17 on a particular side of the firing jet.

As shown in FIG. 5, the rotary kiln 11 is rotated in the direction of the arrow, so that the cement raw material is deposited in the rotary kiln at a position 18 slightly offset in the direction of rotation, and heated while being mixed by the rotation of the rotary kiln.

Due to the tilt of the rotary kiln, it is gradually sent out in the direction of the clinker box 16.

0□The enriched air supply pipe 17 is installed along the deposition position 18 side of the fired material ejection pipe 12 and is ejected from the deposition position 18 side, so that the high temperature portion 20 is supplied to the flame 19 in the rotary kiln on the deposition position 18 side. This makes it possible to compensate for the low calorie content of pulverized coal fuel, and the combustion is carried out intensively at high temperatures, and the amount of waste gas is also reduced, and heat loss due to waste gas is also reduced. I was able to significantly improve my score from about 4 inches to 15 inches.

For example, FIGS. 6 and 7 show a boiler according to the present invention that uses heavy oil as fuel to produce high-temperature, high-pressure steam. A conventional air supply pipe 23 surrounds the heavy oil injection pipe 22 of the combustor provided at one end of the furnace 21 of the boiler, and supplies 02 enriched air corresponding to the total air amount of 5 to 30 cm. tube 2
4 will be provided. The combustion gases of the flame 25 flow through the furnace as shown by the arrows and are exhausted through a passage 26 to the flue provided near the end where the combustor is attached. Since a high-temperature part 27 of the flame occurs on the side where the enriched air supply path 24 is attached, a high-temperature and high-pressure steam pipe 28 is installed on the furnace wall through which the high-temperature flame 2T flows, and a steam pipe 28 for high temperature and high pressure is installed in the downstream of the flow of the flame, that is, to the flue. By arranging a relatively low-temperature steam pipe 29 on the furnace wall on the side of the passage 26, the thermal efficiency of the boiler is improved to 80% or more, compared to the thermal efficiency of 75 before not using 02 enriched air. I can do it.

For example, FIG. 8 shows the state of the glass melting furnace according to the present invention.
There is a flame 3 with a flat shape above it as shown in the figure.
3, or in particular, by supplying 6-enriched air to the lower side of the combustion air in an amount equivalent to 5 to 50 g of the total air amount, a flame is generated in the lower part of the flat flame 32 generated in the furnace. This directly promotes the melting of the glass, and indirectly causes more active combustion in the furnace than before, making it possible to maintain the inside of the furnace at a high temperature. Furthermore, the amount of combustion exhaust gas can be reduced, and therefore the thermal efficiency can be greatly improved compared to the conventional method.

[Brief explanation of drawings]

Figures 1, 2, and 3 are a side sectional view, a front sectional view, and a 02
□Shows a side sectional view of the enriched air production device. 4 and 5 are a side sectional view and a sectional view taken in a plane perpendicular to the central axis of the rotary kiln, respectively, of a rotary kiln type cement firing furnace according to the present invention. 6 and 7 are a side sectional view of the steam generation boiler according to the present invention and a front view of the combustor seen from the combustion furnace. FIG. 8 is a side sectional view of the glass melting furnace according to the present invention. 1 is a tank, 2 is a blower, 3 is a polymer membrane, 4 is an inner chamber, 5 is an enriched air extraction pipe, and 6 is a blower. 7 is a supply pipe, 8 is a pressure valve, 11 is a rotary kiln, 12
13 is a fuel injection pipe, and 13 is a fuel supply pipe. 14 is the primary air supply pipe, 15 is the secondary air supply pipe, 16 is the clinker box, 17 is the 02 enriched air supply pipe, 18
is the cement raw material deposition position, 19 is the flame, and 20 is the high temperature part of the flame. 21 is a furnace, 22 is a heavy oil jet pipe, 23 is an air supply pipe, 24
02 is the enriched air supply pipe, 25 is the flame, 26 is the passage to the flue, 27 is the high temperature part of the flame, 28 is the high temperature and high pressure steam pipe, 29
31 is a glass melting furnace, 32 is a molten glass tank, 33 is a flat flame, and 34 is a high temperature part of the flame. Figure 1 Figure 6

Claims (1)

[Claims] A combustion device in which an 02 enriched air supply pipe is provided along one specific side of a fuel injection pipe or a primary air injection pipe.