JPH04108139U - Combustion gas mixing structure in garbage incinerator - Google Patents

Abstract

(57) [Summary] [Configuration] The combustion gas in the grate-type garbage incinerator is 80
The flue (3), which is maintained at a temperature of 0°C or higher, is provided with a descending path (3b) that allows combustion gas to flow downward. Primary combustion chamber (1), flue (3)
A blow-off port (12) is formed which communicates with the descending passage (3b) and blows out combustion gas upward toward the descending passage (3b). [Effect] The downward flow of combustion gas that has descended through the descending passage (3b) collides with the upward flow of combustion gas that has flowed into the descending passage (3b) from the outlet (12), and the flue (3) The combustion gas is mixed efficiently within the combustion chamber, and the excess air contained in the combustion gas promotes the combustion of unburned substances, thereby preventing the generation of unburned substances containing dioxin precursors such as hydrocarbons. suppressed. Therefore, the generation of dioxin can be prevented and exhaust gas containing very little or no dioxin can be released into the atmosphere.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea relates to garbage incinerators used for incinerating municipal waste, industrial waste, etc. More specifically, we are developing a new structure for combustion furnaces that effectively mixes the combustion gas inside the furnace. It is related to

0002 In this specification, the top, bottom, left and right of each drawing are referred to as top, bottom, left and right, respectively. do.

0003

[Conventional technology]

Examples of conventional grate-type waste incinerators include those shown in Figures 3 and 4. It is being The grate-type waste incinerator shown in Figure 3 is tilted downward toward the right. The primary combustion chamber (1) with the grate (2) and the top wall (1a) of the primary combustion chamber (1) near the left end. It is equipped with a flue (3) that is connected to the part. In this garbage incinerator , the combustion gas is maintained at a temperature of 800°C or higher in the flue (3). .

0004 The garbage (R) in the hopper (4) installed on the left side of the primary combustion chamber (1) is placed on the grate (2). primary air (see arrow A in Figure 3) supplied from below the grate (2). and burned. The combustion gas generated by incinerating garbage (R) is shown in Figure 3. As shown by arrow B, it rises from the primary combustion chamber (1) and enters the flue (3) almost straight. The gas is then sent through a flue (3) to an exhaust gas treatment device (not shown).

[0005] The grate-type waste incinerator shown in Figure 4 has a grate (2) that slopes downward toward the right. A primary combustion chamber (5) having a It is equipped with a straight flue (6). Also in this garbage incinerator, the flue (6) The combustion gas is maintained at a temperature of 800° C. or higher within the chamber.

[0006] The garbage (R) in the hopper (4) installed on the left side of the primary combustion chamber (5) is placed on the grate (2). primary air (see arrow A in Figure 4) supplied from below the grate (2). and burned. The combustion gas generated by incinerating garbage (R) is shown in Figure 4. As shown by arrow B, it rises from the primary combustion chamber (1) and enters the flue (6) almost straight. The gas is then sent through a flue (6) to an exhaust gas treatment device (not shown).

[0007]

[Problem that the idea aims to solve]

However, when incinerating waste using the above-mentioned incinerator, the following problems arise. There is.

[0008] In other words, the combustion gas from the primary combustion chambers (1) and (5) flows almost straight into the flue (3) and (6). The combustion inside the flues (3) and (6) only flows along the flues (3) and (6). The miscibility of the combustion gas is poor, resulting in the generation of unburned substances such as carbon monoxide, hydrocarbons, and soot. Easy to grow.

[0009] Hydrocarbons contained in large amounts in the unburned components of combustion gas are so-called dioxin. It is a toxic precursor that reacts with chlorides such as hydrogen chloride gas in the wake, creating a highly toxic gas. There is a problem of producing ioxin.

0010 The purpose of this invention was to solve the above problems and to dispose of municipal waste and industrial waste in waste incinerators. To provide a garbage incinerator that can prevent the generation of unburned materials when incinerating waste, etc. There are many things.

[0011]

[Means to solve the problem]

The combustion gas mixing structure in the waste incinerator based on this idea is based on the primary It is equipped with a combustion chamber and a flue connected to its downstream side, and the combustion gas is In a grate-type waste incinerator designed to maintain a temperature of 800°C or higher, the flue A descending passage for the combustion gas to flow downward is provided in the primary combustion chamber, and a descending passage of the flue is provided. An air outlet is formed that communicates with the combustion gas and blows out the combustion gas upward toward the descending path. It is characterized by:

0012

[Effect]

The flue is provided with a descending passage that allows the combustion gas to flow downward, and the lower part of the flue is placed in the primary combustion chamber. An air outlet is formed that communicates with the descending passage and blows out the combustion gas upward toward the descending passage. If the combustion gas is Flows directly into the road's descent. Then, the downward direction of the combustion gas that has descended on the descending path The flow collides with the upward flow of combustion gas that has flowed in from the outlet, causing turbulence in the flow. Therefore, the combustion gas is mixed efficiently in the flue, and the residual gas contained in the combustion gas is The surplus air promotes combustion of unburned matter.

[0013]

【Example】

Examples of this invention will be described below with reference to the drawings.

[0014] FIG. 1 shows a waste incinerator that is an improved version of the conventional waste incinerator shown in FIG. Figure 1 Smell Therefore, the flue (3) of the garbage incinerator according to this invention is formed in an inverted U shape by the partition wall (10). The lower end is formed near the left end of the top wall (1a) of the primary combustion chamber (1). The upper end of the ascending passage (3a) is connected to the combustion gas outlet (11), and the upper end is the upper end of the ascending passage (3a). The lower end is located directly above the right end of the top wall (1a) of the primary combustion chamber (1). It consists of the exit route (3b). At the right end of the top wall (1a) of the primary combustion chamber (1), there is a descending path for the flue (3). Air outlet that communicates with the lower end of (3b) and blows out combustion gas upward toward the descending path (3b) (12) is formed.

[0015] In such a configuration, the waste (R) in the hopper (4) is removed from the combustion chamber (1). Primary air is placed on top of the grate (2) and is supplied from below the grate (2) (see arrow A). The generated combustion gas is transferred to the primary combustion chamber (1). Enter the ascending path (3a) of the flue (3) from the exit (11), ascend the ascending path (3a), and continue upward. Turn around at the end and enter the descending path (3b), then descend within the descending path (3b) (see arrow C in Figure 1) . On the other hand, the combustion gas generated on the right side of the grate (2) of the primary combustion chamber (1) flows through the air outlet. (12) and flows directly upward into the descending path (3b) of the flue (3) (see arrow D in Figure 1). . At this time, the downward flow of combustion gas descending down the descending path (3b) and the The upward flow of combustion gas flowing upward into the descending path (3b) collides head-on. The flow is disrupted. Therefore, the combustion gases are mixed efficiently in the descending path (3b) of the flue (3). As a result, the flame, unburned matter, and surplus air are mixed efficiently, and the unburned matter is The combustion of unburned substances including dioxin precursors such as hydrocarbons is promoted. Life is suppressed in advance.

[0016] FIG. 2 shows a waste incinerator that is an improved version of the conventional waste incinerator shown in FIG. Figure 2 Smell According to this invention, an upper There is an internal top wall (15) that protrudes diagonally to the left and whose tip extends upward. As a result, the top wall of the right side of the primary combustion chamber (5) has a double structure inside and outside, and The part between the internal top wall (15) and the external top wall (5a) is an extension part (6A) of the flue (6). ing. And between the upper end of the rising part (15a) of the internal top wall (15) and the external top wall (5a) The gap in the gap serves as a combustion gas outlet (16) from the primary combustion chamber (5). Also, the external top wall A hanging wall (17) is provided on the lower surface of the part near the right end of (5a), and this hanging wall (17) The extension part (6A) of the flue (6) is formed in a U-shape, and the rising part (1) of the internal top wall (15) The part between 5a) and the hanging wall (17) becomes the descending path (6a) through which the combustion gas flows downward. ing.

[0017] At the part corresponding to the descending passage (6a) of the internal top wall (15), at the lower end of the descending passage (6a) of the flue (6). An air outlet (18) is formed that communicates with the combustion gas and blows out the combustion gas upward toward the descending path (6a). It is.

[0018] In such a configuration, the waste (R) in the hopper (4) is removed from the combustion chamber (1). Primary air is placed on top of the grate (2) and is supplied from below the grate (2). (see arrow A). The generated combustion gas is transferred to the primary combustion chamber (1). The combustion gas enters the descending path (6a) of the flue (6) from the combustion gas outlet (16) and descends in the descending path (3b). (see arrow C in Figure 2), turn around at the bottom end and remove the part to the right of the hanging wall (17). Rise. On the other hand, the combustion gas generated on the right side of the grate (2) of the primary combustion chamber (1) is , directly flows upward through the air outlet (18) into the descending path (6a) of the flue (6) (see the arrow in Figure 2). (see D). At this time, the downward flow of combustion gas descending down the descending path (6a) and the 8) and into the descending path (6a) from the front. They collide and disrupt the flow. Therefore, the combustion gas flows efficiently in the descending path (6a) of the flue (6). As a result, the flame and unburned substances are mixed with excess air efficiently. The combustion of unburned materials is promoted, and unburned materials containing dioxin precursors such as hydrocarbons are The generation of fuel is suppressed.

[0019]

[Effect of the idea]

According to the combustion gas mixing structure in the waste incinerator of this invention, as mentioned above, the smoke The combustion gas is mixed efficiently in Hokkaido, and the excess air contained in the combustion gas Contains dioxin precursors such as hydrocarbons, as the combustion of fuel is accelerated. Generation of unburned matter is suppressed. Therefore, the generation of dioxin can be prevented. Exhaust gas containing very little or no dioxins can be released into the atmosphere.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing one embodiment of a garbage incinerator according to the invention.

FIG. 2 is a vertical sectional view showing another embodiment of the waste incinerator according to the invention.

FIG. 3 is a vertical sectional view showing an example of a conventional garbage incinerator.

FIG. 4 is a vertical sectional view showing another example of a conventional garbage incinerator.

[Explanation of symbols]

1,5 Primary combustion chamber 2 Grate 3,6 Flue 3b, 6a descending path 12,18 Air outlet

Claims (1)

[Scope of utility model registration request] Claim 1: A grate-type garbage comprising a primary combustion chamber having a grate and a flue connected to the downstream side thereof, the combustion gas being maintained at a temperature of 800°C or higher in the flue. In the incinerator, the flue is provided with a descending path that causes combustion gas to flow downward, and the primary combustion chamber has an outlet that communicates with the descending path of the flue and blows the combustion gas upward toward the descending path. A combustion gas mixing structure in a garbage incinerator, characterized in that: