JPH0534404U - Boiler economizer - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the noise leaking outside the boiler and improve the boiler efficiency. [Structure] A large number of heat exchange pipes (5) (5), ... to which boiler feed water is supplied are installed horizontally in a vertical and horizontal manner in a casing (4) in which combustion exhaust gas from the boiler flows. In the boiler economizer, the outer wall plate (12) of the casing (4) is
A space formed between the inside of the outer wall plate (12) and the porous plate (11) by disposing a porous plate (11) having a large number of through holes (10) (10) ... This is a boiler economizer in which (S) is filled with a porous sound absorbing material (13).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a boiler economizer.

[0002]

[Prior Art]

 Conventionally, it has been widely practiced to improve the thermal efficiency of the entire boiler system by connecting a economizer to the combustion exhaust gas outlet of the boiler and preheating the feed water to the boiler with the heat recovered from the combustion exhaust gas.

In such a boiler with a economizer, noise generated by combustion in the boiler can leaks to the outside of the boiler through the economizer and the chimney, so that the noise value of the boiler cannot be lowered.

In order to solve this problem, conventionally, a sound-absorbing duct is connected to the outlet of the economizer, but it is necessary to mount a separate member from the economizer, which makes the boiler larger. There is a drawback to

[0005]

[Problems to be solved by the device]

 The present invention has been made to solve the above problems, and its main purpose is to reduce noise leaking from a boiler can without increasing the size of the device. Another object of the present invention is to provide a boiler with high heat efficiency by increasing the heat exchange efficiency in the economizer by insulating the economizer.

[0006]

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and the first feature is that a large number of heat exchange pipes for supplying boiler feed water are vertically arranged in a casing in which combustion exhaust gas from a boiler is circulated. In a boiler economizer horizontally arranged in multiple stages, a perforated plate having a large number of through holes is arranged inside the outer wall plate of the casing, and is formed between the inner side of the outer wall plate and the perforated plate. The second feature is that the porous sound absorbing material is made of a water-repellent material, and the third feature is that it is filled with a porous sound absorbing material in the space. A sound insulation member is provided between the pipes at the exhaust gas outlet.

[0007]

[Action]

 According to the first feature of the present invention, the noise from the boiler can tries to leak to the outside of the economizer together with the combustion exhaust gas, but is composed of the sandwich structure of the casing, the perforated plate and the porous sound absorbing material. Sound is effectively absorbed by the side walls. Further, the heat insulation efficiency of the side wall can increase the combustion exhaust gas and improve the heat exchange efficiency with the heat exchange pipe. Further, according to the second feature, the sound absorbing material is less deteriorated by the dew condensation water, and according to the third feature, the sound insulating member suppresses the leakage, and the noise is kept on the upstream side of the sound insulating member. Sound can be absorbed by the side wall, and the sound absorbing effect can be improved.

[0008]

【Example】

 FIG. 1 and FIG. 2 are a front view and a cutaway sectional view of an essential part showing an embodiment of a boiler economizer according to the present invention.

In the drawings, (1) is a economizer, which comprises a pair of side walls (2) and (2) and a pair of side walls (3) and (3) sandwiching the side walls to form a rectangular tubular main body casing. The bottom opening (4a) of the casing (4) is connected to the exhaust gas outlet of a boiler can of a well-known structure, such as a multi-tube through-flow boiler, through a duct member (neither is shown), The exhaust gas is configured to flow from the lower surface opening (4a) to the upper surface opening (4b) to which the stack is connected.

(5), (5), ... are heat exchange pipes that are horizontally installed vertically and horizontally in multiple steps in a grid pattern and supplied with boiler feed water, and penetrate the side walls (2) and (2). Are supported by the headers (6) (6) ... so that the opening ends of the upper and lower pipe groups are arranged so that water flows in parallel in each of the five horizontal pipe groups. Connected for communication. A large number of substantially vertical circular fins (7) (7) ... Are attached to the outer peripheral surface of each of the pipes (5) (5). (8) is a water supply inflow pipe, and (9) is a water supply outflow pipe.

The side walls (3) and (3) are metal perforated plates in which a large number of through holes (10), (10), ... Are formed inside the outer wall plate (12) which constitutes the casing (4). By arranging (11) at a predetermined interval, the water repellency of a ceramic wool or the like that does not use a binder is provided in the space (S) between the outer wall plate slope (12) and the perforated plate (11). The porous sound absorbing material (13) is filled. The aperture ratio of the multi-hole plate (11) is set to a high value, for example, 0.4 or more, to increase the resonance frequency derived from the aperture ratio and the air layer thickness, and to set the resonance frequency around this frequency relatively. It is configured to absorb annoying noise in the high frequency range.

(14) (14) ... is a combustion exhaust gas outlet of the economizer (1), and in the embodiment, a gap between the heat exchange pipes (5) (5) .. It is a sound insulation member that is composed of a pipe with a square cross section that is arranged so as to cover it.

The operation of the embodiment having the above configuration will be described. The noise caused by the combustion of the boiler rises in the economizer (1) through the bottom opening (4a) of the economizer (1) together with the combustion exhaust gas. This noise is blocked by the sound insulation members (14), (14), ..., and remains under the sound insulation members (14), (14), .. The sound absorbing effect of 11) and the porous sound absorbing material (13) can reduce the amount of noise leaking from the economizer (1). Of course, gas flows between the heat exchange pipes (5) (5) ... and the sound insulation members (14) (14) ... by the fins (7) (7). A possible gap is ensured and the exhaust gas flows out through this gap. Since the sound insulation members (14), (14), ... Are pipe-shaped members having a square cross section in this embodiment, the sound insulation members (14), (14) are filled with a sound absorbing material inside. .. It is possible to further reduce noise by preventing its own resonance (so-called squeaking).

Since the side walls (3) (3) have a triple structure including a porous sound absorbing material, a heat insulating effect can be obtained and heat can be prevented from escaping from the side walls (3) (3). As a result, the combustion exhaust gas temperature can be kept high and the heat exchange pipes (5) (5) ... Can efficiently absorb heat, contributing to the improvement of the thermal efficiency of the boiler system.

The present invention is not limited to the above embodiment. The sound insulation members (14) (14) ... Can be variously modified in shape, and may have a cylindrical shape, an elliptical cross-sectional shape, or a solid shape instead of the hollow shape as described above. A flat plate may be bent, for example, a V-shaped cross section as shown in FIG. Further, as the material of the sound absorbing material (13), a ceramic sound absorbing material which is a water repellent and moisture resistant material that does not absorb condensed water is most desirable.

[0016]

[Effect of the device]

 As described above, the boiler economizer according to the present invention can absorb the noise caused by combustion in the economizer by the sound absorbing effect of the side wall, and can reduce the noise value of the boiler. Further, since no separate and independent member such as a sound absorbing duct is required, the size of the boiler is not increased. Furthermore, since it has a sound absorbing structure consisting of the casing outer wall plate, perforated plate, and moisture-resistant porous sound absorbing material, it can withstand long-term use with less peeling and deterioration even in an environment exposed to highly humid combustion exhaust gas. The effect is great. In addition, the heat insulation effect of the economizer can be improved by the casing having the above-described configuration, so that the heat absorption of the economizer can be improved, which contributes to the improvement of the thermal efficiency of the boiler system. Further, by providing the sound insulation member, the noise reduction effect can be synergistically increased.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a boiler economizer according to the present invention.

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

FIG. 3 is a cutaway sectional view showing a main part of another embodiment of the boiler economizer according to the present invention.

[Explanation of symbols]

 (1) ・ ・ ・ Coal saver (2) ‥ Side wall (3) ‥ Side wall (4) ‥ Casing (5) ‥ Heat exchange pipe (10) ‥ Through hole (11) ‥ Perforated plate (12 ) ・ ・ ・ Outer wall (S) ・ ・ ・ ・ Space

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Creator Takashi Sogabe 7 Horie-cho, Matsuyama-shi, Ehime Miura Industrial Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A large number of heat exchange pipes (5), (5), ... To which boiler feed water is supplied are horizontally arranged in a vertical and horizontal direction in a casing (4) in which combustion exhaust gas from a boiler is circulated. In the boiler economizer, the inside of the outer wall plate (12) of the casing (4) has a large number of through holes (1
0), (10) ... Are provided with a porous plate (11), and a porous material is provided in the space (S) formed between the inside of the outer wall plate (12) and the porous plate (11). A boiler economizer characterized by being filled with a sound absorbing material (13). 2. The boiler economizer according to claim 1, wherein the porous sound absorbing material (13) is made of a water-repellent material. 3. The boiler economizer according to claim 1, wherein the heat exchange pipes (5) (5) are provided on the combustion exhaust gas outlet side of the economizer.
The boiler economizer is characterized in that a sound insulation member (14) (14) ...