JPH094829A - Incinerator - Google Patents

Abstract

PURPOSE: To contrive the reduction of cost and the simplification of maintenance of an exhaust gas passage facility for an incinerator. CONSTITUTION: A heat exchanger 18, consisting of a plurality of pipes 180, is provided in the exhaust gas passage of a furnace body so that the heat exchanger is provided across the exhaust gas passage so as to be slanted so that one end side thereof becomes higher than the other end side of the same. Both ends of the pipes are connected to the water jacket 14 of the peripheral wall of the furnace body to absorb the retaining heat of combustion exhaust gas by cooling water in the pipes and conduct the cooling water, which has received heat, naturally to flow toward the one end side of the pipes by the difference of specific gravity between the cooling water whereby the cooling water in the water jacket 14 is sucked into the other end side of the pipes of the heat exchanger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incinerator for incinerating general wastes and industrial wastes, and particularly to an incinerator for reducing the cost of exhaust gas system passage equipment connected to a furnace body and simplifying maintenance. Regarding the furnace.

[0002]

2. Description of the Related Art In an incinerator for general waste, a combustion chamber and an exhaust gas passage extending upward from the combustion chamber are provided in the furnace body.
A structure in which an exhaust gas passage, a dust collector, an exhaust gas blower, a chimney, and the like are connected to the exhaust gas passage to process and discharge combustion exhaust gas is generally adopted.

In such an incinerator, the combustion exhaust gas has a very high temperature of 600 ° C. to 700 ° C. or more when it exits the exhaust gas passage of the furnace body. It is necessary to cool to 350 to 400 ° C or lower.

Therefore, an air damper 51 is provided in the exhaust gas duct 50 so that the atmospheric air at room temperature is sucked into the exhaust gas duct 50 to be mixed with the combustion exhaust gas and cooled (see FIG. 4).
A method of providing a heat exchanger 52 in the exhaust gas duct 50, supplying cooling water by a water supply pump 53 to cool the combustion exhaust gas (see FIG. 4), a method of spraying fresh water into the exhaust gas duct to cool the combustion exhaust gas, Etc. have been adopted.

[0005]

However, in the conventional exhaust gas cooling method, air or water vapor is mixed in the combustion exhaust gas to increase the total exhaust gas amount. The size of the exhaust gas passage equipment is the combustion exhaust gas capacity (capacity per unit time m ³ / H, m ³ / H
min, m ³ / s, etc.), the amount of exhaust gas increases and decreases almost in proportion to the incineration amount, and also increases and decreases almost in proportion to exhaust gas temperature. A large exhaust gas line facility is required, resulting in an increase in cost.

Further, in the conventional exhaust gas cooling method, a cooling water tank 54, a supply pipe 55, a water supply pump 53, a discharge pipe 56 and the like are provided as auxiliary equipment of the heat exchanger 52 to supply the cooling water to the heat exchanger 52. Therefore, the cost is increased and the maintenance is required.

[0007] In view of the above problems, it is an object of the present invention to provide an incinerator capable of reducing the cost of exhaust gas path facilities and simplifying maintenance.

[0008]

Therefore, an incinerator according to the present invention has a combustion chamber and an exhaust gas passage extending upward from the combustion chamber, burns waste in the combustion chamber, and burns the waste. In an incinerator that discharges exhaust gas from an exhaust gas passage through exhaust gas passage equipment, a water jacket to which cooling water is supplied by a water supply passage equipment is provided on the peripheral wall of the furnace body, while a plurality of exhaust gas passages are provided in the exhaust gas passage. A heat exchanger consisting of pipes is installed across the exhaust gas passage and inclined so that one end of each pipe is higher than the other end, and both ends of each pipe of the heat exchanger are connected to a water jacket, The cooling water in each pipe absorbs the heat of combustion exhaust gas, and the received cooling water naturally flows toward one end of the pipe due to the difference in specific gravity from the cooling water on the other end of the pipe. Cooling water in the packet is characterized by being to be drawn into each pipe the other end of the heat exchanger.

It is desirable that the pipes of the heat exchanger are dispersed in the exhaust gas passage at appropriate intervals from each other so as not to hinder the flow of the combustion exhaust gas in the exhaust gas passage. The number of pipes may be appropriately set depending on the conditions such as the amount of combustion exhaust gas, the pipe diameter, and the cooling temperature. If the exhaust gas flow velocity (m / s) flowing in the exhaust gas passage equipment is too fast, it will cause equipment vibration, wear of steel, increase in blower power, etc., so normal speed (10-20 m / s) is used. Is good.

In the water jacket of the furnace body, the cooling water receives the temperature of the furnace body to cause a convection phenomenon. However, when the pipe of the heat exchanger is simply connected to the water jacket, the cooling water in the heat exchanger pipe and the water The temperature difference with the cooling water in the jacket is small and it is difficult for the cooling water to flow into the heat exchanger pipe. Therefore, if the cooling water in the water jacket is rectified by a rectifying plate into a descending flow and an ascending flow, and the lower end of the heat exchanger pipe is connected to the cooling water descending flow region, the cooling water inside the heat-received pipe and the pipe lower end side The difference in specific gravity from the cooling water becomes large, whereby the cooling water in the pipe easily rises, and the cooling water in the water jacket also tends to be sucked into the lower end of the heat exchanger pipe.

[0011]

When the waste is incinerated in the combustion chamber, the combustion exhaust gas is sent from the combustion chamber through the exhaust gas passage to the exhaust gas passage equipment. At that time, the cooling water is supplied to the water jacket of the furnace body to cool the furnace body, and the cooling water absorbs the heat of the combustion exhaust gas in the heat exchanger pipe. It can be cooled below the temperature.

Since the cooling water received in the heat exchanger pipe becomes hotter than the cooling water on the other end side of the heat exchanger pipe, it is directed toward one end side (upper end side) of the inclined pipe of the heat exchanger due to the difference in specific gravity. Flow in the heat exchanger pipe and the other end side (lower end side)
The cooling water in the water jacket is newly sucked into the heat exchanger, so that the cooling water is naturally circulated in the heat exchanger pipe. Therefore, a water supply pump, a water supply pipe, and a drainage pipe, which are required when a heat exchanger is provided in a conventional exhaust gas duct, are not required, and cost reduction and simplification of maintenance can be achieved.

Further, since the combustion exhaust gas is cooled by the heat exchanger in the exhaust gas passage, it is not necessary to supply cooling air by an air damper or spray fresh water in the exhaust gas duct as in the conventional case, and the total exhaust gas amount Does not increase, and does not lead to an increase in the size of the exhaust gas system road equipment.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the specific examples shown in the drawings. 1 and 2 show an incinerator according to an embodiment of the present invention. In the figure, a combustion chamber 1 is provided in a furnace body 10.
1 and an exhaust gas passage 12 extending upward from the combustion chamber 11, a furnace lid 13 is provided above the combustion chamber 11 of the furnace body 10 so as to be openable and closable, and the furnace lid 13 is indicated by a dashed line in FIG.
The waste can be put into the combustion chamber 11 by opening.

A water jacket 14 is provided on almost the entire peripheral wall of the furnace body 10 except for the furnace lid 13.
In the water jacket 14, an expansion chamber 140 having a larger thickness direction is formed at the back surface of the exhaust gas passage 12, a vapor discharge port 141 is formed at the upper end of the expansion chamber 140, and at the upper end of the expansion chamber 140. A cooling water supply pipe 15 is connected and a water level controller 16 is provided.

The exhaust gas duct 1 is provided at the upper end of the exhaust gas passage 12.
70 is connected, the exhaust gas duct 170 is bent in a substantially V shape, and its tip is connected to the dust collector 171.
1, one end of an exhaust gas duct 172 is connected, the exhaust gas duct 172 is bent downward, an exhaust gas blower 173 is connected to the tip thereof, and the exhaust gas blower 173 has a chimney 17
4 is connected to the lower end portion of the exhaust gas duct 170, the dust collector 171, the exhaust gas duct 172, the exhaust gas blower 173.
Also, the exhaust stack system 17 is configured by the chimney 174. In addition, the furnace body 10 is provided in the middle of the exhaust gas duct 170.
An air damper 17 for controlling the temperature of the flue gas at the outlet
5 is provided so that a small amount of air can be inhaled.

A heat exchanger 18 is provided in the exhaust gas passage 12. This heat exchanger 18 has a plurality of pipes 18
0, each pipe 180 is distributed across the exhaust gas passage 12 in the front-rear direction and at a predetermined interval from each other, and is provided so as to be inclined so that one end side of each pipe 180 is higher than the other end side. Both ends of each pipe 180 communicate with and are connected to the water jacket 14.

When the furnace lid 13 is opened and the waste is burned in the combustion chamber 11,
When the combustion exhaust gas is thrown into the interior and incinerated, it reaches the dust collector 171 from the combustion chamber 11 through the exhaust gas passage 12 and the exhaust gas duct 170 as shown by the arrow B in FIG. 1, and the dust in the combustion exhaust gas is collected. After that, it is discharged to the atmosphere through the exhaust gas gact 172, the exhaust gas blower 173, and the chimney 174. At that time, cooling water is supplied to the water jacket 14 of the furnace body 10 by a water supply system passage facility (not shown),
The cooling water receives the high heat of the furnace body 10 and cools the furnace body 10.

On the other hand, the cooling water in the water jacket 14 also exists in the heat exchanger pipe 180, and the cooling water comes into contact with the combustion exhaust gas flowing in the exhaust gas passage 12 via the heat exchanger pipe 180, The endothermic heat is absorbed. Since the cooling water that has received heat has a temperature higher than that of the lower end side cooling water of the heat exchanger pipe 180, the cooling water flows toward the upper end side of the heat exchanger pipe 180 due to the difference in specific gravity thereof and is discharged to the front portion of the water jacket 14. Therefore, the cooling water in the water jacket 14 is newly sucked into the lower end side of the heat exchanger pipe 180, and the cooling water is naturally circulated in the heat exchanger pipe 180.

Therefore, the combustion exhaust gas can be easily cooled by the heat exchanger 18 to a temperature not higher than the allowable heat-resistant temperature of the exhaust gas system passage equipment 17, and no additional equipment such as a water feed pump for the heat exchanger is required and the cost can be reduced. In addition, the maintenance can be simplified, the total amount of exhaust gas does not increase, and the exhaust gas passage facility does not increase in size.

FIG. 3 shows a second embodiment of the present invention, and the same symbols as those in FIGS. 1 and 2 indicate the same or corresponding parts. In this embodiment, the expansion chamber 1 for the water jacket 14
A rectifying plate 20 is provided inside 40, and the inside of the expansion chamber 140 is divided into an outer side downward flow region D of cooling water and an inner side upward flow region U, and the lower end side of the heat exchanger pipe 180 is the cooling water. It communicates with the downflow region D.

In the furnace body water jacket, the cooling water receives the furnace body temperature to cause a convection phenomenon. As shown in FIG. 1, the other end of the heat exchanger pipe 180 is placed in the expansion chamber 140 of the water jacket 14. If it is simply projected and connected to the heat exchanger pipe 180, the temperature of the cooling water in the heat exchanger pipe 180 and the expansion chamber 1
The difference from the temperature of the cooling water on the inner wall side of 40 is small, and it is difficult for the cooling water to flow into the heat exchanger pipe 180.

On the other hand, in this embodiment, the expansion chamber 140
A rectifying plate 20 is provided inside to divide into a descending flow region D and an ascending flow region U, and the other end of the heat exchanger pipe 180 is connected to the cooling water descending flow region D so that the cooling water in the pipe receives heat. When the temperature rises to a high temperature, the temperature difference between the cooling water on the lower end side of the pipe and the cooling water on the lower end side of the pipe becomes larger than that in the case of FIG.
80 is vigorously sucked and natural circulation is actively performed.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an incinerator according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a main part configuration diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a main part of a conventional incinerator.

[Explanation of symbols]

 10 furnace body 11 combustion chamber 12 exhaust gas passage 14 water jacket 17 exhaust gas passage equipment 18 heat exchanger 180 pipe 20 straightening plate U cooling water ascending flow area D cooling water descending flow area

Claims (2)

[Claims] 1. A furnace having a combustion chamber and an exhaust gas passage extending upward from the combustion chamber, incinerating waste in the combustion chamber,
In an incinerator in which the combustion exhaust gas is discharged from the exhaust gas passage through the exhaust gas passage equipment, a water jacket 14 to which cooling water is supplied by the water supply passage equipment is provided on the peripheral wall of the furnace body 10 while the exhaust gas passage is provided. A heat exchanger 18 including a plurality of pipes 180 is provided in the pipe 12 so as to cross the exhaust gas passage 12 and be inclined so that one end side of each pipe 180 is higher than the other end side. Both ends are connected to the water jacket 14, the cooling water in each pipe 180 of the heat exchanger 18 absorbs the retained heat of the combustion exhaust gas, and the received cooling water has a specific gravity difference from the cooling water on the other end side of the pipe 180. 180 so that the cooling water in the water jacket 14 is sucked into the other end of each pipe 180 of the heat exchanger 18. An incinerator characterized by being formed. 2. The water jacket 14 has a rectifying plate 20 which divides a cooling water downward flow region D and an upward flow region U therein, and the other end side of each pipe 180 of the heat exchanger 18 has a cooling water downward flow. The incinerator according to claim 1, which is in communication with the area D.