Incinerator for the High Speed Combustion of Waste Products

The present invention is concerned with an incinerator for the high speed combustion of waste products.

The handling of waste products has been becoming one of the serious problems encountered by contemporary human beings because the waste products affect the ecology and have occupied more and more room which is precious to human beings. Many people are using incinerators to handle waste products. Theoretically speaking, sufficient oxygen and suitable dryness of the waste products are the two main factors for optimizing the combustion in the incinerators. Some conventional incinerators produce atmospheric pollution in the nature of bad odors because of the design. These defects provide insufficient oxygen and thus the combustion therein is not complete.

Thus the present invention is aimed to overcome or substantially eliminate the above disadvantages.

The primary object of the present invention is to provide tangential air inlets on an inner pipe of the incinerator so that an air flow can rapidly revolve in the incinerator to help combustion and produce intense flame and high temperature. Thus the waste products sent into the incinerator can be substantially completely burned or melted and no residue which has not been completely burned can be produced. Thereby the problem of handling waste products can be solved.

Another object of the present invention is to utilize a tertiary air flow to sufficiently preheat the waste products before they are introduced into the incinerator. Therefore, the waste products can be dried and the temperature thereof can be raised so as to facilitate and optimize the combustion.

Still another object of the present invention is that a plurality of tangential air inlets and radiating whirling sheets are provided on the peripheral walls of the inner pipes of the burning furnace and the incinerator. These tangential air inlets and the radiating whirling sheet not only increase the speed of the revolving secondary air flow and a tertiary air flow, but also generate a hot air flow surrounding the waste products under combustion, driving the same to revolve coninuously along the inside of the pipe of the incinerator, and making the same look like a burning fire ball. Thus the path passed by the burning waste product can be lengthened, the duration of the combustion can be lengthened, and the complete combustion can be achieved, (The said path passed by the burning waste products approximately equals the product of .pi., the diameter of the incinerator, and the number of the revolutions. Therefore, the said revolving can lengthen the said path and, furthermore, facilitate the automatic discharge of the ash and residue after the combustion).

A further object of the present invention resides in that a conveyer having a net-shaped conveying face is provided on the incinerator with a plurality of partition plates on the conveyor. Waste products can be sufficiently preheated and prevented from being blown away by the air flow when they are being preheated.

Still a further object of the present invention is that an accessory equipment for separating the ash and the residue is provided on the incinerator for efficiently collecting the ash and residue, and eliminating the problems such as the plugging of the pipe, and atmospheric pollution.

One more object of the present invention is to provide an incinerator of simpler structure and a lower cost than those of the conventional ones.

These and other objects, features and advantages of the invention will become more apparent from a consideration of the following description taken in connection with the accompanying drawings.

FIG. 1 is a partial cross-sectional view of an incinerator according to the present invention;

FIG. 2 is an enlarged partial cross-sectional view of an embodiment of a burning furnace utilized in the present invention;

FIG. 3 is a cross-sectional view taken along line A--A of FIG. 2;

FIG. 4 is a left side view of the burning furnace shown in FIG 2;

FIG. 5 is a parital cut-away view of the burning furnace shown, in FIG. 2 showing an inner pipe. and intermediate pipe and relevant parts thereof;

FIG. 6 is an enlarged partial cross-sectional view of another embodiment of the burning furnace utilized in the present invention;

FIG. 7 is a cross-sectional view taken along line A--A of FIG. 6; and

FIG. 8 is a left side view of the burning furnace shown in FIG. 6.

As seen from FIG. 1, the incinerator of the present invention comprises mainly a burner 1, a burning furnace 2, and an incinerator 4. The burner 1 can be of the type disclosed in my U.S. Pat. No. 4,428,309 issued on Jan. 31, 1984 and is employed to control the air flow and the fuel.

The burner 1 includes essentially a fuel tank 10, a mixer 11, and a controller for controlling the amount of the fuel and the air flow (not shown in the drawings). The fuel tank 10 is of funnel shape and is employed for the storing and cleaning of the fuel. As best seen in FIG. 2, the mixer 11 has an inner pipe, an intermediate pipe, and an outer pipe, and is provided with an oil sprayer 223 and fan-shape whirling or air directing sheets 224 on the central part thereof. A flange 8 is provided on the left end of the burner 1 for connecting with a burning furnace 2 or a boiler. A plurality of ribs 80 are provided on the flange 8 for reinforcement. This burner 1 is utilized for mixing uniformly the pulverized coal or heavy oil and a primary air flow, and injecting the same into a burning furnace 2 for combustion. This burner 1 can control the amount of the air flow and the fuel in response to a signal representing the temperature in the incinerator 4 by means of a conventional device not shown in the drawings.

As seen from FIGS. 2 and 5, the burning furnace 2 is comprised mainly of an inner pipe 24, an intermediate pipe 25, and an outer pipe 26 which are of transverse cylindrical shape. A neck portion of the inner pipe 24 is of truncated conical shape. The right end of the inner pipe 24 is connected with the flange 8 of the mixer 11 and is secured thereto with fastening screws 81. The left end of the inner pipe 24 is provided with the flange 3 for connecting with the incinerator 4. A plurality of ribs 30 are provided on the flange 3 for reinforcement. The inner pipe 24 is provided with several rows of tangental air flow inlets 22 which are inclined and arranged in alignment with each other. The inner pipe 24 is also provided with a radiating whirling or air directing sheet 21 to facilitate the rapid entering of the air from the inlets into the incinerator 4 for helping combustion. A spark plug 20 which is connected to an electrical means not shown in the drawing is provided on the top edge of the neck portion on the right end of the inner pipe 24. Refractory material 28 is arranged near the outlet on the left end of the inner pipe 24. An ash outlet 23 is provided on the buttom of the left end of the inner pipe 24. An ash discharge tube 60 is connected under the ash outlet 23 so that the ash resulted from the combustion can be discharged therefrom. As seen from FIG. 4, and 5, a water sprayer 61 is provided on the ash discharge tube 60 from the water sprayer 61 and flows out from a waste water discharge tube 62 on the bottom of the sedimentation water tank 6 for being circulated and utilized again. The bottom edge of the intermediate pipe 25 is provided with a preparatory heavy oil discharge tube 27 so that the heavy oil which has not been burned can be discharged therefrom. A radiating whirling or air directing sheet 21 is also provided around the intermediate pipe 25. As best seen in FIG. 2, two tertiary air flow inlets 70 and 72 are provided on the right end of the outer pipe 26 facing rightward and downward respectively as shown in the drawing. Air enters into the space between the outer pipe 26 and the intermediate pipe 25 in tangential direction from the tertiary air flow inlet 71 and then flows into the space inside of the inner pipe 24 through the tangential air flow inlets 22 under the influence of the radiating whirling or air directing sheets 21 so as to drive the waste products under combustion to rapidly revolve and advance.

The appearance and the structure of the incinerator 4 is similar to that of the burning furnace 2. As best seen in FIG. 1, an inner pipe 43, an intermediate pipe 44, and on outer pipe 45 are provided on the incinerator 4 which is secured to the burning furnace 2 with fastening screw 31. The inner pipe 43 is provided on its wall with several rows of tangential air inlets 41 which are inclined and arranged in alignment with each other. A waste products input duct 93 is mounted on the top of the central part of the inner pipe 43. The waste products input duct 93 penetrates through the intermediate pipe 44 and the outer pipe 45, and extends into a preheating chamber 9. A plurality of hot air bores 92 are provided on the section of the waste products input duct 93 between the intermediate pipe 44 and the outer pipe 45 so as to introduce a tertiary air flow of the incinerator 4 into the preheating chamber 9. The bottom of the left end of the inner pipe 43 is provided with an ash outlet part 46 which is connected with an ash discharge tube 50. The ash discharge tube 50 is provided with a water sprayer 51 on its wall, and a sedimentation water tank 5 on its lower end. A residue conveyer 53 is provided in the sedimentation water tank 5 which has a waste water discharge tube 52 mounted on its bottom for draining the waste water. A radiating whirling or air directing sheet 42 which is generally of the shape of helix is provided around the outer wall of the inner pipe 43. Two tertiary air flow inlets 72 are provided on the bottom of the outer pipe 45, one on the left side, the other on the right side, the tertiary air flow of the incinerator 4 flows into the space between the out pipe 45 and the intermediate pipe 44 along a tangential direction.

In operation, please refer to FIG. 1, the primary, the secondary, and the tertiary air flows can be blown rapidly into the burning furnace 2 by turning on a single blower providing simultaneously the three air flows or turning on three blowers each of which provides one of the three air flows respectively. The blowers are not shown in the drawings, the primary and the secondary air flows of the burning furnace 2 are introduced into the mixer 11 from the inlet 7. The primary air flow is mixed uniformly with the pulverized coal or heavy oil in the inner pipe of the mixer 11, injected into the inner pipe 24 of the burning furnace 2 and is ignited by the spark plug 20 when it is passing through the neck portion of the inner pipe 24. The secondary air flow is simultaneously introduced rapidly through the outer pipe of the mixer 11 into the space between the intermediate pipe 25 and the inner pipe 24 of the burning furnace 2. Because of the radiating whirling or air directing sheet 21 provided around the outer wall of the inner pipe 24, the secondary air flow, after entering the space between the inner pipe 24 and the intermediate pipe 25, will flow along tangential air flow inlets 22 and radiating whirling or air directing sheet 21, undergo heat exchange, and form a revolving high speed and high temperature air flow. This rapid hot air flow is introduced from the tangential air inlets 22 into the inner pipe 24 to help combustion so that the flame is injected into the incinerator 4 for providing the heat for combustion. The temperature at the left end outlet on the inner pipe 24 of the incinerator 4 is the highest in the incinerator 4, therefore, some refractory material 28 is arranged near the said outlet. The ash resulted from the combustion in the inner pipe 24 can automatically be separated because of the centrifugal force therein, discharged through the ash discharge tube 60, cooled with the water injected from the water sprayer 61, and sedimented in the sedimentation water tank 6. Besides, the tertiary air flow of the burning furnace 2 can be directed into the space between the intermediate pipe 25 and the outer pipe 26 of the burning furnace 2 through the inlet 70 or 71 to undergo heat exchange. Therefore, hot air flow can be introduced into the incinerator 4 to facilitate the combustion. Because of the arrangement of the radiating whirling or air directing sheet 21 on the outer wall of the intermediate pipe 25, the tertiary air flow can rapidly revolve in the space between the intermediate pipe 25 and the outer pipe 26 and simultaneously absorb the radiant heat from the inner pipe 24 so that the temperature can be raised. After the flame and the air flow have entered the incinerator 4, the primary air flow and the secondary air flow of the burning furnace 2 enter the inner pipe 43 of the incinerator 4 and form an intense fire ball to intensify the flame and drive the waste products which are disposed in the inner pipe 43 and surrounded by the air to revolve and be burned. The tertiary air flow of the burning furnace 2 enters the space between the inner pipe 43 and the intermediate pipe 44, revolvingly advances along the radiating whirling or air directing sheets on the outer wall of the inner pipe 43, and forms the secondary air flow of the incinerator 4. This secondary air flow produces a revolving wind which is introduced through the tangential air flow inlets 41 into the space inside of the inner pipe 43 to help combustion and to drive the waste products to revolvingly advance inside of the inner pipe 43. The tertiary air flow of the incinerator 4 flows from the tertiary air flow inlet 72 on the bottom of the outer pipe 45 into the space between the intermediate pipe 44 and the outer pipe 45 along a tangential direction. A radiating whirling sheet is also provided on the outer wall of the intermediate pipe 44 of the incinerator 4. Therefore, the tertiary air flow blown into the outer pipe 45 in tangential direction will revolvingly advance along the outer wall of the intermediate pipe 44 and simultaneously absorb the radiant heat of the inner pipe 43 by undergoing heat exchange and becomes hotter. This tertiary air flow of high temperature is introduced into the preheating chamber 9 through the hot air bores 92 on a waste products input duct 93 to sufficiently preheat the waste products on the conveyer 90 so that the waste products can be dehydrated introduced into the inner pipe 43, and efficiently burned. Furthermore, partition plates 91 are provided on the waste products conveyer 90, thus the waste products being preheated would not fall off the conveyer 90. The waste products in the inner pipe 43 are continuously burned and revolvingly advance along the inner wall of the inner pipe 43. The waste products are burned to ash which has been substantially completely burned because the waste products have passed through a long path in the incinerator 4 and the combustion duration is long. The ash is automatically separated and discharged at the ash discharged outlet 46, collected by ash discharge tube 50, cooled by the water injected from the water spayer 51, sedimented at the sedimentation water tank 5, and moved away by a residue conveyer 53.

The outlets on the left ends of the burning furnace 2 and the incinerator 4 are susceptible to high temperature, therefore, the portions near these outlets can be formed of refractory material to endure high temperature. Furthermore, the inner pipe 43 of the incinerator 4 can be completely made of refractory material.

A second embodiment of the burning furnace 2 in the present invention is shown in FIGS. 6, 7 and 8. As seen from FIG. 6, two neck portions are provided on the left side and the right side of the inner pipe 24 of the burning furnace 2 respectively and are of truncated conical shape. Futhermore, several rows of tangential air flow inlets 22' are arrranged in inclined lines or straight lines. A secondary air flow is rapidly introduced into the inner pipe 24 from the tangential air flow inlets 22' for helping combustion. A plurality of fan-shaped whirling or air directing sheets 224 are provided on the connection portion between the right end of the inner pipe 24 and the left end of the mixer 11. An oil nozzle 223 is provided on the central part of the connection portion and is communicated with the mixer via an oil tube. A radiating whirling or air directing sheet 21' is arranged in a transver shape or a helical shape and is provided around the outer wall of the inner pipe 24 of the burning furnace. The radiating whirling or air directing sheet 21' is in the shape of a bent helix at the left neck portion of the inner pipe 2 from which a secondary air flow can be injected into the incinerator 4, the radiating whirling sheet 21 is employed to optimize radiation and to make the flame to be revolvingly injected into the incinerator 4.

A radiating whriling or air directing sheet 21' is also provided around the outer wall of the intermediate pipe 25 of the burning furnace 2 so that a tertiary air flow entering a tertiary air flow inlet 71 on the outer pipe 26 can rapidly revolvingly advance to radiate heat and be injected into the incinerator 4 to help combustion. The fuel and the air flow in this embodiment can also be automatically controlled and the primary air flow, the secondary air flow and a tertiary air flow can utilized to rapidly radiate heat and help combustion in the burning furnace 2 so as to achieve a complete combustion and inject an intense flame into the incinerator 4.

The burning furnace 2 of the first embodiment or the second embodiment can be comprised of an inner pipe, and an intermediate pipe instead of three pipes as illustrated.

In conclusion, an intense flame is utilized in the present invention to completely burn the waste products which can be advanced in a revolving direction in the incinerator so that the combustion effect can be optimized.