JPH06249419A - Rotary kiln for incineration - Google Patents

Abstract

PURPOSE:To improve the combustion efficiency and cool the furnace walls and control the furnace temperature with a good effect so as to prevent attachment of fused materials relating to a rotary kiln for incinerating industrial waste which evolves heat at high calorific values. CONSTITUTION:A kiln 1 has a front combustion chamber A in the front half and a rear combustion chamber B having a larger diameter in the rear half with a tapered part 10 intervening at a median position of the shell wall. In the shell wall 11 around the front combustion chamber a plurality of secondary- air intake tubes 14, each opening at the front end 13 of the kiln and at the tapered part 10 in the middle, are buried at uniform intervals all along the circle. Through some of the intake tubes brought to lower positions of the kiln water and compressed air are fed from a nozzle 30 facing these intake tubes to the rear combustion chamber B in a manner to be injected into it in jets, whereas through the other intake tubes secondary air is constantly fed and from a nozzle 20 water and compressed air are injected in a jet into the front combustion chamber A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary kiln of an incinerator for incinerating scrapped vehicle shredder dust and other high-heat-production mass waste.

[0002]

2. Description of the Related Art A rotary kiln has been proposed in which the first half (pyrolysis chamber) of the incinerator input side of the kiln is composed of an inner cylinder and an outer cylinder, and secondary air is supplied to the rear of the kiln through a gap between the inner and outer cylinders. (Japanese Patent Laid-Open No. 53-142056). In addition, when incinerating a high calorific value material such as a plastic product in a rotary kiln, a method is also known in which the material is moistened with water beforehand and then charged. In the former case, the kiln becomes large and it is necessary to supply a large amount of air, so that the mixture with the incinerator moving on the wall surface of the kiln is poor and the incomplete combusted substances increase. In addition, the latter pre-wetting method has a problem in that it has a problem in ignitability in the front chamber and is ineffective in managing combustion in the rear chamber.

[0003]

The present invention utilizes the secondary air introducing pipe in the secondary air introducing pipe burying kiln to inject water along with the secondary air evenly over the entire length of the kiln so that the temperature inside the furnace is increased. It provides a rotary kiln that can be managed. By controlling the amount of water injected and burning it at an appropriate temperature according to each waste, CO generation is suppressed without increasing the size of the kiln itself, and by local heating. It prevents melting of metal and enables safe operation.

[0004]

According to the rotary kiln of the present invention, a large number of secondary air introduction pipes are formed in the body wall of the kiln, the front end face of the body wall is opened, and the inner wall of the intermediate wall of the kiln is opened. A front combustion chamber and a rear combustion chamber whose body diameter is increased through the intermediate taper portion, and the front end face of the kiln is provided with an annular secondary air retention chamber on the back face. A water injection nozzle that is rotatably supported by being positioned in the secondary air introduction annular groove of the fixed partition wall and is located above the incineration material inlet of the fixed partition wall and has its tip reaching the front combustion chamber. Is fixed, and the rear room water injection nozzle is fixed to face the plurality of secondary air introducing pipes located below the kiln.

In the above structure, the rear furnace wall structure is the same as that of the conventional rotary kiln, and the secondary air introduction pipe is composed of 30 to 80 iron pipes having a diameter of 2 to 3 inches. In the present invention, the injection nozzles for the front chamber and the rear chamber are connected to the water supply pipe and the compressed air pipe, and the compressed air contributes to combustion as secondary air in the kiln. Further, as shown in FIG. 4, the secondary air introducing pipe embedded in the body wall has two layers or more, and it is possible to divide the kiln cylinder into a multilayer cylinder and divide the combustion chamber into three or more.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 1 is a rotary kiln which is rotatably supported via support rings 2 and 3. Reference numeral 4 is an afterburning chamber, 5 is an incinerator charging duct, and 6 is a charging port. The kiln 1 is composed of a front combustion chamber A through an intermediate taper portion 10 and a rear combustion chamber B having a cylinder 12 having a diameter larger than that of the combustion chamber cylinder 11, and the kiln front end is formed in the cylinder wall 1A of the front combustion chamber. Thirty to forty secondary air introduction pipes 14 that open to the surface 13 and open to the intermediate tapered portion 10 are embedded in a circumferential shape at equal intervals.
Further, the front end face 13 is positioned in a non-contact manner in an annular groove 15 formed on the inner surface of the fixed partition wall 7. The fixed partition wall 7 supports the charging duct 5 and is provided with an auxiliary combustion burner 8 and a primary air port 9. An annular cover 18 is fixedly provided on the back surface of the fixed partition wall 7, and an annular secondary air retention chamber 19 is formed inside the cover. A plurality of communication holes 16 for supplying secondary air are formed in the rear portion of the annular groove 15 through the connection portion 16a. Reference numeral 17 denotes a secondary air blowing port for blowing the secondary air into the kiln, which is opened on the inner circumference of the communication hole 16. Reference numeral 17a is a control valve.

Reference numeral 20 denotes a water injection nozzle for the front chamber, which has a length of at least 1/3 of the length of the front chamber and is fixed to the fixed partition wall 7 by a length such that water droplets reach the combustion region, and compressed air Tube 25
It is connected to A and the water supply pipe 25B. Reference numeral 30 denotes a water injection nozzle for the rear chamber, which is composed of a plurality of nozzle groups facing the open ends of the plurality of secondary air introduction pipes 14 located below the body. For example, as shown in FIG. It is provided in.
Each nozzle is connected to the compressed air pipe 26A and the water supply pipe 26B. Reference numeral 23 is an air compressor, 27 is a water tank, 28 is a pump, and 24 and 29 are flowmeters. Although the kiln is drawn horizontally in the figure, it is actually provided so as to be inclined toward the rear chamber.

The multi-layer cylinder kiln shown in FIG. 4 is constructed by burying secondary air introduction pipes in the cylinder wall 11 so as to be doubled inside and outside with different lengths. The inside secondary air introduction 141 and the outside secondary air introduction. The pipes 142 open to the tapered portions 100 and 110, respectively, and a second chamber 122 is formed between the first chamber 121 corresponding to the front chamber A and the third chamber 123 corresponding to the rear chamber B.
In this case, the water injection nozzle 20 for the front chamber is located in the first chamber 121 while maintaining the relationship shown in FIG. 1, and the water injection nozzle 30 for the rear chamber is located in the lower part of the kiln.
It is provided so as to face the open ends of the secondary air introducing pipes 141 and 142.

[0009]

The incinerator charged into the front combustion chamber A from the charging duct 5 is pyrolyzed and sent to the rear combustion chamber B while burning, but during this time, the temperature inside the kiln excessively rises due to water injection from the nozzle 20. Prevent from doing. Further, the compressed air and the water spray are continuously ejected from the nozzle 30 toward the secondary air introduction pipe opening 14A located in the lower part of the kiln, which is ejected from the kiln inner wall discharge port 14B of the rear chamber B. As a result, the combustion temperature is maintained below the combustion temperature, and molten metal and the like are prevented from adhering to the furnace wall. 2 for each secondary air inlet pipe except the bottom of the kiln without interruption
Secondary air is supplied to cool the furnace wall of the rear combustion chamber and maintain uniform combustion. Water injection from the nozzles 20 and 30 can be performed only when necessary.

[0010]

[Effect] In the kiln of the present invention, the temperature inside the furnace is controlled by the secondary air from the injection port 17 and the water injection from the nozzle 20 along the furnace wall of the front combustion chamber A, and is further supplied to the buried secondary air introduction pipe. The compressed air, the compressed air supplied to the introduction pipe in the lower part of the kiln, and the injection water contribute to the cooling of the front combustion chamber furnace wall. In the rear combustion chamber, the introduction pipe 1
4, the secondary air is constantly supplied to the inner wall of the furnace, and it is possible to prevent the melt from adhering to the inner wall of the furnace by cooling the inner wall of the furnace by the water jetted from the discharge port 14B in the lower part of the kiln. The stable operation of can be done.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a kiln according to the present invention.

FIG. 2 is a side view of a fixed partition wall.

[Figure 3] Front view of the kiln

FIG. 4 is a sectional view of a multi-layer body kiln.

[Explanation of symbols]

 10 Intermediate Taper Part 11 Front Combustion Chamber Body 12 Rear Combustion Chamber Body 14 Secondary Air Inlet Pipe 15 Annular Groove 16 Communication Hole 17 Secondary Air Inlet 18 Annular Cover 19 Annular Air Reservoir 20 Front Room Water Injection Nozzle 30 Rear Room Water injection nozzle 23 Air compressor 28 Pump

Claims (1)

[Claims] 1. A front part in which a large number of secondary air introducing pipes, which are open to the front end face of the body wall of the kiln and open to the inner surface of the intermediate taper part body wall of the kiln, are embedded in parallel with the body shaft. A combustion chamber and a rear combustion chamber whose diameter is expanded through the intermediate taper portion are connected to each other, and the front end surface of the kiln has a fixed partition wall provided with an annular secondary air retention chamber on the back surface thereof. A water injection nozzle, which is positioned in the annular groove for use in a non-contact manner and is rotatably supported, is positioned above the incineration material inlet of the fixed partition wall, and has its tip reaching the front combustion chamber, and is further fixed. A rotary kiln for an incinerator in which a rear room water injection nozzle is fixedly installed so as to face a plurality of secondary air introduction pipes located below the kiln.