JP3690910B2 - Ceramic sound absorbing plate for preventing ash particle accumulation - Google Patents
Ceramic sound absorbing plate for preventing ash particle accumulation Download PDFInfo
- Publication number
- JP3690910B2 JP3690910B2 JP02541598A JP2541598A JP3690910B2 JP 3690910 B2 JP3690910 B2 JP 3690910B2 JP 02541598 A JP02541598 A JP 02541598A JP 2541598 A JP2541598 A JP 2541598A JP 3690910 B2 JP3690910 B2 JP 3690910B2
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- Prior art keywords
- absorbing plate
- sound absorbing
- ceramic
- ceramic sound
- ash particle
- Prior art date
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- 239000000919 ceramic Substances 0.000 title claims description 42
- 239000002245 particle Substances 0.000 title claims description 26
- 238000009825 accumulation Methods 0.000 title description 5
- 239000007789 gas Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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- Chimneys And Flues (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明はボイラから大気中へ放出される排ガスの消音器に使用される灰粒子堆積防止セラミック吸音板に関する。
【０００２】
【従来の技術】
従来、ボイラ等から排出される排ガスは大気に放出する際、圧力差により騒音を発生する。そのため、排ガス通路（煙道）内にセラミックの吸音板を設置し、騒音の発生を抑制している。セラミック吸音板は一般的にムライト（Ａｌ2 Ｏ3 −ＳｉＯ2 セラミック）を高温で多孔質になるように焼成したもので図２に示すような構造をもっている。すなわち、図２の（ａ）はその平面図、（ｂ）は断面図を示し、図２中、１は音を吸収する役割をもつ多孔質セラミック吸音板、２は該板を固定する金属外枠、３はセラミック（Ａｌ2 Ｏ3 −ＳｉＯ2 ）粒子、４は該粒子間の空隙である。
排ガスはセラミック吸音板の前に灰粒子除去装置が取り付けられ、環境基準以下の灰粒子しか大気中には放出されない。ところが、環境基準以下であっても、極微小の灰粒子が長時間排出されるとセラミック吸音板に選択的に堆積し、吸音効果をもたらすセラミック内の多孔質部分（空隙部分）に堆積し、吸音効果が低下する問題があった。
【０００３】
灰粒子がセラミック内の空隙に堆積する理由は、下記のとおりである。すなわち、排ガス流と、そのガス流れにのっている灰粒子は灰粒子と排ガス間の摩擦によりマイナスの静電気を帯びるが、一方セラミックは絶縁体であるため電気が流れず、セラミック吸音板は排ガスとの摩擦によりプラスの静電気を帯びる。この帯電したセラミック吸音板と帯電した灰粒子は引き合って灰粒子付着が発生する。この灰粒子付着により、吸音効果をもたらすセラミック内の多孔質部分に灰が堆積し、吸音効果が低下する現象が発生していたのである。
【０００４】
【発明が解決すようとする課題】
本発明は上記技術水準に鑑み、従来のセラミック吸音板の有する上記欠点を解消し、灰粒子堆積による吸音効果が低下することがないセラミック吸音板を提供しようとするものである。
【０００５】
【課題を解決するための手段】
本発明はセラミック吸音板の片面又は両面に接地された導電性金網を取り付けてなることを特徴とする灰粒子堆積防止セラミック吸音板である。
【０００６】
【発明の実施の態様】
本発明による灰粒子堆積防止多孔質セラミック吸音板の一態様を図１によって説明する。なお、図１の（ａ）は平面図、（ｂ）は断面図であって、図１中、５は金網を示す。他の符号１〜４は図２と同じ部位を示すので説明は省略する。金網５は灰粒子堆積防止機能を有するもので、セラミック吸音板１に取り付けてある金属製外枠２に接合されている。金属製外枠２と金網５は電気的に接地（図示省略）されている。
なお、金網５の目開きが０．１ｍｍ以下では金網固定による音の反射が大きく、セラミック吸音板１の役割りである吸音効果が発揮できず、５０ｍｍ以上では接地された金網５の接地による電位の上昇（チャージアップ）を抑制することができないので、金網５の目開きは０．１〜５０ｍｍの範囲が好ましい。
【０００７】
（作用）
この構造により排ガス流にのっている灰粒子は排ガスとの摩擦によりマイナスの静電気を帯び、一方、セラミック吸音板は排ガスとの摩擦によりプラスの静電気を帯びても、セラミック吸音板を囲んでいる金網が電気伝導性をもち接地されているため、セラミック吸音板のガス流れによる電位の上昇（チャージアップ）が抑制され、セラミック吸音板が接地されているのと同じ状態、つまり周りの構造体と同じ電位になっているため、灰粒子付着は周りの金属構造体と同じレベルになる。この理由から、セラミック吸音板への灰粒子の堆積は小さくなるので、吸音効果の低下を抑制することができる。
【０００８】
【実施例】
以下、本発明の具体的な実施例をあげ、本発明の灰粒子堆積防止セラミック吸音板の効果を明らかにする。本実施例に従い、（１）金網無しの従来の３００ｍｍ×３００ｍｍ×厚さ１０ｍｍのセラミック吸音板、（２）前記吸音板の接地した金属外枠に目開き５０ｍｍの金網を固定したセラミック吸音板及び（３）同金属外枠に目開き１００ｍｍの金網を固定したセラミック吸音板を試験用微粉炭炊きボイラの排ガス煙道部に設置し、モーラ炭を微粉化して試験用微粉炭炊きボイラで連続的に燃焼させ、１００時間作動させた。試験を加速させるために灰粒子除去装置はボイラとセラミック吸音板間に設置せず、セラミック吸音板後方に設置した。
【０００９】
表１に１００時間作動後のセラミック吸音板の重量増加分を示す。この重量増加分は微粉炭燃焼後の灰である。（１）金網無しの従来のセラミック灰吸音板は６３ｇ重量増加しているのに対し、（２）目開き５０ｍｍの金網を固定したものの重量増加は７ｇであり、大幅な灰の堆積が抑制された。目開き１００ｍｍの金網を固定したものは金網の制電効果が十分でなく、灰堆積は５０ｇであった。
【００１０】
【表１】
【発明の効果】
本発明の灰粒子堆積防止セラミック吸音板によれば、セラミック吸音板中のセラミックの間隙に灰粒子の堆積量が大幅に低減され、吸音効果の低下が著しく防止できる効果を奏する。
【図面の簡単な説明】
【図１】本発明の灰粒子堆積防止セラミック吸音板の概略図。
【図２】従来のセラミック吸音板の概略図。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ash particle accumulation-preventing ceramic sound absorbing plate used in a silencer for exhaust gas discharged from a boiler into the atmosphere.
[0002]
[Prior art]
Conventionally, when exhaust gas discharged from a boiler or the like is released into the atmosphere, noise is generated due to a pressure difference. Therefore, a ceramic sound absorbing plate is installed in the exhaust gas passage (smoke) to suppress the generation of noise. The ceramic sound-absorbing plate is generally obtained by firing mullite (Al 2 O 3 —SiO 2 ceramic) so as to be porous at a high temperature, and has a structure as shown in FIG. 2 (a) is a plan view, and FIG. 2 (b) is a cross-sectional view. In FIG. 2, 1 is a porous ceramic sound absorbing plate having a role of absorbing sound, and 2 is a metal outer plate for fixing the plate. Frame 3 is ceramic (Al 2 O 3 —SiO 2 ) particles, and 4 is a space between the particles.
As for the exhaust gas, an ash particle removing device is attached in front of the ceramic sound absorbing plate, and only ash particles below the environmental standard are released into the atmosphere. However, even if it is below the environmental standard, when ultra-fine ash particles are discharged for a long time, they are selectively deposited on the ceramic sound-absorbing plate, and are deposited on the porous part (void part) in the ceramic that provides the sound-absorbing effect. There was a problem that the sound absorption effect was lowered.
[0003]
The reason why ash particles accumulate in the voids in the ceramic is as follows. In other words, the exhaust gas flow and the ash particles on the gas flow are negatively charged due to the friction between the ash particles and the exhaust gas. On the other hand, since ceramic is an insulator, electricity does not flow, and the ceramic sound absorbing plate is exhaust gas. It is charged with positive static electricity due to friction. The charged ceramic sound absorbing plate and the charged ash particles attract each other to cause ash particle adhesion. As a result of the adhesion of the ash particles, ash was deposited on the porous portion in the ceramic that provided the sound absorption effect, and a phenomenon that the sound absorption effect was reduced occurred.
[0004]
[Problems to be solved by the invention]
In view of the above technical level, the present invention aims to provide a ceramic sound-absorbing plate that eliminates the above-mentioned drawbacks of conventional ceramic sound-absorbing plates and does not deteriorate the sound-absorbing effect due to ash particle deposition.
[0005]
[Means for Solving the Problems]
The present invention is an ash particle deposition-preventing ceramic sound absorbing plate characterized in that a grounded conductive wire mesh is attached to one side or both sides of a ceramic sound absorbing plate.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the ash particle deposition-preventing porous ceramic sound absorbing plate according to the present invention will be described with reference to FIG. 1A is a plan view, FIG. 1B is a cross-sectional view, and in FIG. 1, 5 indicates a wire mesh. The other reference numerals 1 to 4 indicate the same parts as those in FIG. The metal mesh 5 has a function of preventing ash particle accumulation, and is joined to a metal outer frame 2 attached to the ceramic sound absorbing plate 1. The metal outer frame 2 and the wire mesh 5 are electrically grounded (not shown).
When the mesh of the metal mesh 5 is 0.1 mm or less, sound reflection due to fixing of the metal mesh is large, so that the sound absorbing effect as the role of the ceramic sound absorbing plate 1 cannot be exhibited. Therefore, the mesh opening of the wire mesh 5 is preferably in the range of 0.1 to 50 mm.
[0007]
(Function)
Due to this structure, the ash particles in the exhaust gas flow are negatively charged due to friction with the exhaust gas, while the ceramic sound absorbing plate surrounds the ceramic sound absorbing plate even if positively charged due to friction with the exhaust gas. Since the metal mesh is electrically conductive and grounded, the rise in potential (charge-up) due to the gas flow of the ceramic sound absorbing plate is suppressed, and the same state as the ceramic sound absorbing plate is grounded, that is, the surrounding structure Because of the same potential, ash particle adhesion is at the same level as the surrounding metal structure. For this reason, the accumulation of ash particles on the ceramic sound-absorbing plate is reduced, so that the sound-absorbing effect can be prevented from decreasing.
[0008]
【Example】
Hereinafter, specific examples of the present invention will be given to clarify the effects of the ash particle deposition preventing ceramic sound absorbing plate of the present invention. According to the present embodiment, (1) a conventional ceramic sound absorbing plate having no wire mesh of 300 mm × 300 mm × 10 mm thickness, (2) a ceramic sound absorbing plate having a metal mesh having an opening of 50 mm fixed to the grounded metal outer frame of the sound absorbing plate, and (3) A ceramic sound-absorbing plate with a 100 mm mesh wire mesh fixed to the outer metal frame is installed in the flue gas flue section of the test pulverized coal-fired boiler. And operated for 100 hours. In order to accelerate the test, the ash particle removing device was not installed between the boiler and the ceramic sound absorbing plate, but was installed behind the ceramic sound absorbing plate.
[0009]
Table 1 shows the weight increase of the ceramic sound absorbing plate after 100 hours of operation. This weight increase is ash after pulverized coal combustion. (1) While the conventional ceramic ash sound absorbing plate without a wire mesh is increased by 63 g, (2) the weight increase of a wire mesh with a mesh opening of 50 mm is 7 g, which suppresses significant ash accumulation. It was. The wire mesh with a mesh opening of 100 mm was not sufficiently effective in controlling the wire mesh, and the amount of ash deposited was 50 g.
[0010]
[Table 1]
【The invention's effect】
According to the ash particle deposition preventing ceramic sound absorbing plate of the present invention, the amount of ash particles deposited in the ceramic gap in the ceramic sound absorbing plate is greatly reduced, and the effect of significantly reducing the sound absorbing effect can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic view of a ceramic sound absorbing plate for preventing ash particle accumulation according to the present invention.
FIG. 2 is a schematic view of a conventional ceramic sound absorbing plate.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02541598A JP3690910B2 (en) | 1998-02-06 | 1998-02-06 | Ceramic sound absorbing plate for preventing ash particle accumulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02541598A JP3690910B2 (en) | 1998-02-06 | 1998-02-06 | Ceramic sound absorbing plate for preventing ash particle accumulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11223329A JPH11223329A (en) | 1999-08-17 |
| JP3690910B2 true JP3690910B2 (en) | 2005-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02541598A Expired - Fee Related JP3690910B2 (en) | 1998-02-06 | 1998-02-06 | Ceramic sound absorbing plate for preventing ash particle accumulation |
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| Country | Link |
|---|---|
| JP (1) | JP3690910B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5964286B2 (en) * | 2013-12-27 | 2016-08-03 | 三菱日立パワーシステムズ株式会社 | Heat exchanger |
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1998
- 1998-02-06 JP JP02541598A patent/JP3690910B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JPH11223329A (en) | 1999-08-17 |
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