JPH11200837A - Mixing device of high temperature gas and cooling water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a water pressure change even when a cooling water flow rate is changed, and to always efficiently cool exhaust gas by arranging a cooling water chamber to surround an exhaust pipe on the outer periphery of the outlet end part of the exhaust pipe, and arranging ring-shaped clearance in contact with the exhaust pipe to a cooling water chamber partitioning wall inner end of the end surface side of the exhaust pipe. SOLUTION: Cooling water 6 filled in a cooling water chamber 2 from a cooling water inlet pipe 5 is injected as a cylindrical water screen into an expanding chamber 7 to expand exhaust gas by passing through ring-shaped clearance 4 arranged in contact with an exhaust pipe 1 on the inside end of an elastic partition wall 3 on the end surface side of an exhaust pipe 1. In this case, water 6 is blown off while turning toward the center of a flow of the exhaust gas 8 by generating turning motion since the cooling water inlet pipe 5 is arranged in the tangent direction in the cooling water chamber 2. At this time, the ring-shaped clearance 4 expands since an outer peripheral edge-fixed elastic partition wall 3 is deformed on the inside diameter side by a much water quantity, so that a large quantity of cooling water flows in the expanding chamber 7 to effectively cool the exhaust gas 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for injecting cooling water into high-temperature exhaust gas (hereinafter referred to as "exhaust gas") burned from a gasoline engine, a diesel engine, a gas turbine, a boiler or the like (hereinafter referred to as "engine device") to cool the exhaust gas. It is an invention.

[0002]

2. Description of the Related Art Conventionally, when exhaust gas cannot be directly exhausted to the outside, there is a case where exhaust gas mixed with water and cooled is discharged. In particular, in the case of marine engines, exhaust is often discharged onto the water surface, and high-temperature gas is dangerous, and water is injected into the exhaust pipe to lower the exhaust temperature. These exhaust gases have large fluctuations in their flow rates with changes in the output of the engine device, and it is necessary to change the cooling water for cooling them in accordance with the gas amount. In order to cool the exhaust gas effectively, it is necessary to use a cooling water injection nozzle.However, if a large nozzle is designed for a large flow rate, if the cooling water injection is However, high-temperature gas partially flowed, and the exhaust pipe was burned, and high-temperature gas flowed to the outside was dangerous. Also, if a small nozzle is designed for a low flow rate, the water pressure will be high when the flow rate is high, causing problems such as damage to the equipment and the need for a large pump to counter the high water pressure. Was.

[0003]

SUMMARY OF THE INVENTION According to the present invention, in accordance with the above-described conditions in which the amount of exhaust gas changes, even when the flow rate of the cooling water is changed, the water pressure change is reduced, and the uniform injection conditions are always maintained. The purpose is to mix the exhaust gas and the cooling water uniformly and to make it possible to cool efficiently.

[0004]

In order to achieve the above object, one of the high temperature gas / cooling water mixing devices (hereinafter referred to as a mixing device) of the present invention is provided on the outer periphery of the exhaust pipe at the exhaust outlet end of the exhaust pipe. A cooling water chamber surrounding the exhaust pipe is provided, and a ring-shaped gap is provided at the inner end of the cooling water chamber partition wall on the end face side of the exhaust pipe in contact with the exhaust pipe. One of the devices of the present invention is characterized in that a partition having a ring-shaped gap on the end face of the exhaust pipe has elasticity. Another one of the mixing devices of the present invention is:
The end face of the exhaust pipe and the ring-shaped gap at the inner end of the cooling water chamber partition at the end face side are close to each other, and the ring-shaped gap at the inner end of the partition can interfere with the exhaust pipe wall or the end face of the exhaust pipe due to the movement of the partition by elasticity. It is characterized by doing so. Another aspect of the mixing apparatus of the present invention is characterized in that the cooling water inlet to the cooling water chamber is arbitrarily intersected with the direction of the exhaust pipe so that the cooling water is swirled.

[0005]

The mixing device of the present invention injects cooling water in a cylindrical film shape to the entire outer periphery of the exhaust gas from the ring-shaped gap at the inner end of the cooling water chamber partition wall provided at the end face of the exhaust pipe which is in contact with the exhaust pipe. Therefore, the cooling water is ejected so as to surround the exhaust gas coming out of the exhaust pipe, and is sufficiently mixed with the expanding exhaust gas. When the amount of cooling water increases, the elastic partition wall expands due to a slight water pressure, and the ring-shaped gap at the inner end of the partition wall is expanded and the area increases, so that the jet flow rate increases and the water pressure does not rise abnormally. Further, by providing the exhaust pipe end face and the inner end of the partition wall sufficiently close to each other, even with a small amount of water pressure, the partition wall protrudes beyond the exhaust pipe end face, so that the ring-shaped gap is further widened and a rise in water pressure can be prevented. When the inner end of the partition wall comes out ahead of the end face of the exhaust pipe as described above, the cooling water is ejected toward the center of the exhaust pipe, so that the cooling water is easily mixed. However, mixing the cooling water with the exhaust gas having a high temperature too rapidly may not be preferable because the water evaporates explosively. In such a case, the cooling water inlet pipe is crossed with the exhaust pipe at an appropriate angle so that the cooling water has an appropriate swirling speed, and the jet flow is expanded conically outward by the centrifugal force of the swirling. This can also prevent rapid mixing with exhaust gas.

[0006]

1 is an oblique cross-sectional view of an example of a mixing apparatus, wherein 1 is an exhaust pipe, 2 is a cooling water chamber provided at an end of the exhaust pipe, and 3 is made of an elastic material. Numeral 4 is a ring-shaped gap provided at a portion in contact with the exhaust pipe inside the partition. Reference numeral 5 denotes a cooling water inlet pipe. 6 is a flow of cooling water, 7 is an expansion chamber in which exhaust gas expands, and 8 is a flow of exhaust gas. The cooling water 6 filled in the cooling water chamber passes through the ring-shaped gap 4 and is injected as a cylindrical water curtain into the expansion chamber 7 where the exhaust gas expands. FIG. 2 is a longitudinal sectional view showing a section viewed from the Y direction shown in FIG. The water 6 entering from the cooling water inlet pipe 5 generates a swirling motion as shown by the flow of the cooling water, and is ejected from the ring-shaped gap into the expansion chamber. FIG. 3 is a longitudinal sectional view taken along line XX of FIG. The turning speed of the cooling water 6 changes depending on the direction and angle of the inlet pipe 5. FIG. 4 is an enlarged view of part A of FIG. 2 and shows the flow of the cooling water when the amount of water is small, and shows the interference position between the ring-shaped gap 4 formed by the elastic partition walls 3 and the end of the exhaust pipe and the cooling water at that time. FIG. 6 is a cross-sectional view showing a flow 6 of FIG. FIG. 5 is an enlarged view of a portion A in FIG. 2, showing the flow of the cooling water in the case of a moderate amount of water, and showing a state in which the elastic partition wall 3 is further deflected by water pressure than in FIG. 4. The cooling water 6 blows out while turning toward the center of the flow of the exhaust gas 8. FIG. 6 is an enlarged view of the portion A in FIG. 2 and shows the flow of the cooling water when the amount of water is larger than that in FIG. The bulkhead 3 moves greatly due to the larger amount of water, and the large movement of the bulkhead 3 widens the ring-shaped gap 4, so that a large amount of cooling water flows while swirling toward the center of the exhaust gas 8. The present invention can also take the following forms. (1) A rubber, plastic plate, metal plate, or the like can be used as the elastic partition wall.

[0007]

The present invention is constructed as described above, and evenly jets the exhaust gas flow to the outer periphery of the exhaust gas flow in a wide fluctuation range of the cooling water amount, thereby preventing uneven cooling and an abnormal rise in water pressure, and It is uniformly mixed with the exhaust gas and efficiently cools the exhaust gas.

[0008]

[Brief description of the drawings]

FIG. 1 is a perspective view of an example of a high-temperature gas / cooling water mixing apparatus.

FIG. 2 is a cross-sectional view of an example of a high-temperature gas / cooling water mixing apparatus.

FIG. 3 is a vertical cross-sectional view of an example of a mixing device for high-temperature gas and cooling water.

FIG. 4 is a diagram showing a relationship between an elastic partition wall and jet water at a small cooling water amount

FIG. 5 is a diagram showing the relationship between the movement of the elastic partition and the jet water at a moderate cooling water amount.

FIG. 6 is a diagram showing the relationship between the movement of the elastic partition and the jet water when the amount of cooling water is large.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Exhaust pipe 2 ... Cooling water chamber 3 ... Elastic partition wall 4 ... Ring-shaped clearance 5 ... Cooling water inlet pipe
6 Flow of cooling water 7 Expansion chamber 8 Flow of exhaust gas

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16L 53/00 F16L 53/00 A 55/00 55/00 G

Claims (1)

[Claims] A water chamber partition wall on an exhaust outlet side of a water chamber provided on an outer periphery of an outlet end portion of an exhaust pipe has elasticity, and a space between the exhaust outlet pipe of the exhaust pipe and the elastic partition wall is provided. A high-temperature gas / cooling water mixing device provided with a ring-shaped cooling water jet that can interfere with the end of the exhaust pipe.