JPS6367093B2 - - Google Patents
Info
- Publication number
- JPS6367093B2 JPS6367093B2 JP56072175A JP7217581A JPS6367093B2 JP S6367093 B2 JPS6367093 B2 JP S6367093B2 JP 56072175 A JP56072175 A JP 56072175A JP 7217581 A JP7217581 A JP 7217581A JP S6367093 B2 JPS6367093 B2 JP S6367093B2
- Authority
- JP
- Japan
- Prior art keywords
- air
- induced draft
- draft fan
- electrostatic precipitator
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000012717 electrostatic precipitator Substances 0.000 claims description 19
- 239000000428 dust Substances 0.000 claims description 3
- 238000004056 waste incineration Methods 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims description 2
- 239000012716 precipitator Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000003068 static effect Effects 0.000 description 3
- 101001137510 Homo sapiens Outer dynein arm-docking complex subunit 2 Proteins 0.000 description 1
- 102100035706 Outer dynein arm-docking complex subunit 2 Human genes 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M20/00—Details of combustion chambers, not otherwise provided for, e.g. means for storing heat from flames
- F23M20/005—Noise absorbing means
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chimneys And Flues (AREA)
Description
【発明の詳細な説明】
本発明は都市ごみ焼却炉の昇温時に電気集塵機
に発生する気圧の変化のサイクルによつて誘引通
風機と電気集塵を結ぶ煙道内に発生する空気振動
による低周波騒音の防止に係るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes low frequency vibrations caused by air vibrations generated in the flue connecting the induced draft fan and the electrostatic precipitator due to the cycle of changes in atmospheric pressure that occurs in the electrostatic precipitator when the temperature rises in the municipal waste incinerator. This relates to noise prevention.
第１図に都市ごみ焼却システムの一例を示す。 Figure 1 shows an example of a municipal waste incineration system.
ごみ焼却炉の燃焼開始するときは、ごみ投入が
行われていないので、ホツパー１の扉２は閉じて
いるが、火炉４の下にあるストーカ３の下から押
込通風機１５のダクト１６を通して冷風が送り込
まれバーナ５を点火してボイラ６を温める。 When the waste incinerator starts burning, the door 2 of the hopper 1 is closed because no waste has been put into the incinerator, but cool air is passed through the duct 16 of the forced draft fan 15 from below the stoker 3 located below the furnace 4. is sent to ignite burner 5 and heat boiler 6.
一方、ボイラの出口ダンパ７より出た炉内ガス
は煙道８を通つて電気集塵機９に入り、脱塵のあ
とダクト１０のダンパ１１を通つて誘引通風機１
２を通り出口ダンパ１３を経て煙道１４に排出さ
れる。 On the other hand, the furnace gas discharged from the outlet damper 7 of the boiler passes through the flue 8 and enters the electrostatic precipitator 9, and after dust removal passes through the damper 11 of the duct 10 and into the induced draft fan 1.
2 and is discharged to the flue 14 via the outlet damper 13.
炉温が低い時は、火炉４内のガス量がないの
で、誘引通風機１２前のダンパー１１はしぼられ
るが、火炉４との間が遠いので、バーナー５の調
整範囲内の火炉静圧を保つためにボイラの出口ダ
ンパ７をしぼることがある。 When the furnace temperature is low, there is no gas in the furnace 4, so the damper 11 in front of the induced draft fan 12 is compressed, but since it is far from the furnace 4, the furnace static pressure is within the adjustment range of the burner 5. In order to maintain the temperature, the boiler outlet damper 7 may be throttled.
特に、省エネルギー対策として、押込通風機１
５を運転せず火炉４内の圧力を一定にするために
ボイラの出口ダンパ７をしぼると誘引通風機１２
の引く力が大きくなり通風機の性質上不安定領域
に入ることになる。 In particular, as an energy-saving measure, forced ventilation
In order to keep the pressure in the furnace 4 constant without operating the boiler 5, when the boiler outlet damper 7 is squeezed, the induced draft fan 12
The pulling force of the fan becomes large and enters an unstable region due to the nature of the ventilator.
また、ボイラの出口ダンパ７がしぼられている
から電気集塵機９内の空気は瞬間的に誘引通風機
１２の静圧の大きさによつて引出されるから一時
負圧が大きくなる。 Furthermore, since the outlet damper 7 of the boiler is squeezed, the air in the electrostatic precipitator 9 is momentarily drawn out by the magnitude of the static pressure of the induced draft fan 12, so that the negative pressure temporarily increases.
この負圧のために、ボイラ出口から入つて来る
ガス量は瞬間的に増加するが、流路がダンパ７に
よつてしぼられていると電気集塵機９内のガス量
が瞬間的に増加を防ぐために瞬間差を生じるの
で、電気集塵機９は一種の空気バネとなる。 Due to this negative pressure, the amount of gas entering from the boiler outlet increases instantaneously, but if the flow path is squeezed by the damper 7, the amount of gas inside the electrostatic precipitator 9 is prevented from increasing instantaneously. Since there is an instantaneous difference due to the air flow, the electrostatic precipitator 9 becomes a kind of air spring.
これを繰返すと電気集塵機９を空気バネとし、
誘引通風機１２とを結ぶダクト１０内のガスを運
動質量とする自動振動が発生することによつて、
低周波空気振動の騒音が発生する。 By repeating this, the electrostatic precipitator 9 becomes an air spring,
By generating automatic vibrations using the gas in the duct 10 connected to the induced draft fan 12 as a moving mass,
Low frequency air vibration noise is generated.
第１図をモデル化して第２図に示すようなシス
テムを考えることにより空気振動による低周波騒
音発生の原理を解析する。 By modeling Figure 1 and considering a system as shown in Figure 2, we will analyze the principle of low frequency noise generation due to air vibration.
主な記号をつぎのように定める。 The main symbols are defined as follows.
Ａ，ｌ 配管の断面積、長さ
Pb，Ｑ 送風機の風圧、風量
Pc，Vo 電気集塵機の空気圧力、容積
Ｕ，Uc，U1 管内空気の流速、その平均値、
変動分
γ，Ｋ 空気の比重量、比熱比
ξ 管内摩擦損失係数
とすると、
管内の空気の圧縮性を無視すれば、気柱の運動
方程式は、
γ／ｇAldu／dt
＝Ａ（｜Pb｜−｜Pc｜）−ξAγU2／2g ……(1)
但し、Pb，Pcは負圧であるから計算上絶対値
をとる。 A, l Cross-sectional area and length of the pipe P b , Q Wind pressure of the blower, air volume P c , Vo Air pressure and volume of the electrostatic precipitator U, Uc, U 1 Flow velocity of air in the pipe, its average value,
Assuming that the variation γ, K is the specific weight of air, the specific heat ratio ξ is the friction loss coefficient in the tube, the equation of motion of the air column is γ/gAld u /d t = A (｜P b |−|P c |)−ξAγU 2 /2g ...(1) However, since P b and P c are negative pressures, they are calculated as absolute values.
電気集塵機内の圧力、比重量は断熱変化を仮定
すると
Pc／γk＝−定
とおけるから、時間で微分して
dPc／dt＝KPc／γ d〓／dt＝KPc／γV0 ｄ（V0γ）
／dt
電気集塵機より、時間当りAγUの空気が流出
し、AγUcの空気が流入するからこの差は
ｄ（V0γ）／dtに等しいので
dPc／dt＝KPc／γV0Aγ（Ｕ−Uc）
＝KPc／V0AU1 ……(2)
一方、送風機（誘引通風機）の特性曲線（風圧
―風量）を
Pb＝ｆ（Ｑ），Ｑ＝AU
とすると、
dPb／dt＝df(Q)／dQＡ・dU1／dt ……(3)
(2)(3)式を(1)に代入すると
ｄ／dt（ξAγU2／2g）
＝ξAγ／ｇＵdU／dt≒ξAγ／ｇUcdU1／dt
とおけるから、
γAl／ｇ・d2U1／dt 2
＝Ａ（df(Q)／dQ・Ａ・dU1／dt−KPc／V0AU1）−ξAγU
c／ｇ・
dU1／dt
従つて、両辺を整理して
γl／ｇ d2U1／dt 2＋（ξγUc／ｇ−Ａdf(Q)／dQ）dU1
／dt＋KPcＡ／V0
U1＝０ …(4)
送風機の特性曲線は一般に第３図のような形で
与えられ、風量QBにおいて静圧が最大となり、
QB＜Ｑ（＝AUc）ではdf(Q)／dQ＜０であるから、正
の減衰となり自励振動は起らないが、
QB＞Ｑでは、df(Q)／dQ＞０であるから
ξγUc／ｇ−Ａdf(Q)／dQ＜０のとき自励振動による
低
周波空気振動による騒音が発生する。 Assuming an adiabatic change in the pressure and specific weight inside the electrostatic precipitator, it can be assumed that P c /γ k = -constant, so by differentiating it with respect to time, dP c /d t =KP c /γ d〓/d t =KP c / γV 0 d(V 0 γ)
/d tFrom the electrostatic precipitator, air of AγU flows out per hour, and air of AγU c flows in, so this difference is equal to d(V 0 γ)/d t , so dP c /d t = KP c /γV 0 Aγ (U-Uc) = KP c /V 0 AU 1 ...(2) On the other hand, if the characteristic curve (wind pressure - air volume) of the blower (induced draft fan) is P b = f (Q), Q = AU, dP b /d t = df (Q) /dQA・dU 1 /d t ...(3) Substituting equations (2) and (3) into (1), d/d t (ξAγU 2 /2g) =ξAγ/ Since gUdU/d t ≒ξAγ/gU c dU 1 /d t , γAl/g・d 2 U 1 /d t 2 = A(df (Q) /dQ・A・dU 1 /d t −KP c /V 0 AU 1 )−ξAγU
c /g・dU 1 /d tTherefore , rearranging both sides, γl/g d 2 U 1 /d t 2 + (ξγU c /g−Adf (Q) /dQ) dU 1
/d t + KP c A/V 0 U 1 = 0...(4) The characteristic curve of a blower is generally given in the form shown in Figure 3, where the static pressure is maximum at air volume Q B , and Q B < Q (= AU c ), since df (Q) /dQ < 0, there is positive damping and self-excited vibration does not occur; however, when Q B > Q, df (Q) / dQ > 0, so ξγU c /g -Adf (Q) When /dQ<0, noise is generated due to low frequency air vibration due to self-excited vibration.
本発明においては、ボイラの出口ダンパ７をし
ぼつた省エネルギー運転を行つたとしても自励振
動による低周波空気振動騒音が発生しないように
第４図に示す電気集塵機バイパスダクト１７およ
びボイラ出口ダクト８、電気集塵機ダクト１０に
それぞれ大気吸込口１８，１９，２０を設ける
か、電気集塵機出口ダクト１０と誘引通風機出口
ダクト１４との間に連絡ダクト２１を設けて車風
を作ることにより、電気集塵機９が空気バネの役
目をしないようにすると共に、誘引通風機１２の
運転が第３図のQB＜Ｑとなるように
ξγUc／ｇ−Ａdf(Q)／dQ＞０
とする。 In the present invention, the electrostatic precipitator bypass duct 17 and the boiler outlet duct 8 shown in FIG. , by providing atmospheric suction ports 18, 19, and 20 in the electrostatic precipitator duct 10, respectively, or by providing a communication duct 21 between the electrostatic precipitator outlet duct 10 and the induced draft outlet duct 14 to create a vehicle wind, the electrostatic precipitator 9 does not act as an air spring, and ξγU c /g−Adf (Q) /dQ>0 so that the operation of the induced draft fan 12 satisfies Q B <Q in FIG. 3.
すなわち、管内空気の流速の平均値Ucの値を
大きくすると共にdf／dQ＜０の範囲にすること
である。 That is, the value of the average value U c of the flow velocity of the air in the tube is increased and the value is set in the range of df/dQ<0.
第１図は従来の都市ごみ焼却炉の焼却システム
を示す系統図、第２図は前記第１図の焼却システ
ムの振動発生機構を示す等価系統図、第３図は遠
心送風機の風圧―風量特性曲線図、および第４図
は第２図に相当する本発明の焼却システムの振動
発生機構を示す等価系統図である。
１……ホツパ、２……扉、３……ストーカ、４
……火炉、５……バーナ、６……ボイラ、７……
ボイラの出口ダンパ、８……煙道、９……電気集
塵機、１０……電気集塵機出口ダクト、１１……
ダンパ、１２……誘引通風機、１３……ダンパ、
１４……誘引通風機出口ダクト、１７……電気集
塵機バイパスダクト、１８，１９，２０……大気
吸込口、２１……電気集塵機出口ダクトと誘引通
風機出口ダクト。
Figure 1 is a system diagram showing the incineration system of a conventional municipal waste incinerator, Figure 2 is an equivalent system diagram showing the vibration generation mechanism of the incineration system shown in Figure 1, and Figure 3 is the wind pressure-air volume characteristics of a centrifugal blower. The curve diagram and FIG. 4 are equivalent system diagrams showing the vibration generating mechanism of the incineration system of the present invention corresponding to FIG. 2. 1...Hotsupa, 2...Door, 3...Stalker, 4
...Furnace, 5...Burner, 6...Boiler, 7...
Boiler outlet damper, 8... flue, 9... electrostatic precipitator, 10... electrostatic precipitator outlet duct, 11...
Damper, 12... induced draft fan, 13... damper,
14...Induced draft fan outlet duct, 17...Electrostatic precipitator bypass duct, 18, 19, 20...Atmospheric suction port, 21...Electric dust collector outlet duct and induced draft fan outlet duct.
Claims (1)
によつて生じた炉内ガスを出口ダンパを備えたボ
イラで冷却後空気集塵機により脱塵して、誘引通
風機を通つてガスを排出する都市ごみ焼却システ
ムにおいて、電気集塵機の前後、およびこの電気
集塵機のバイパスダクトの途中の少なくとも一方
に大気取入口を設けるか、誘引通風機の前後をダ
クトによつて結び、送風の一部を車風にすること
により、電気集塵機と誘引通風機との間に発生す
る空気振動系における減衰係数を正値とすること
を特徴とする都市ごみ焼却システム。1. A city where garbage taken from a hopper is incinerated in a furnace, and the resulting gas in the furnace is cooled in a boiler equipped with an outlet damper, then dedusted with an air dust collector, and the gas is discharged through an induced draft fan. In a waste incineration system, an air intake port is provided before and after the electrostatic precipitator, and at least in the middle of the bypass duct of this electrostatic precipitator, or a duct is connected between the front and back of the induced draft fan, and a portion of the air is diverted to the vehicle wind. A municipal waste incineration system characterized in that, by doing so, the damping coefficient in the air vibration system generated between the electric precipitator and the induced draft fan is set to a positive value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56072175A JPS57187522A (en) | 1981-05-15 | 1981-05-15 | Incinerating system for urban refuge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56072175A JPS57187522A (en) | 1981-05-15 | 1981-05-15 | Incinerating system for urban refuge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57187522A JPS57187522A (en) | 1982-11-18 |
| JPS6367093B2 true JPS6367093B2 (en) | 1988-12-23 |
Family
ID=13481622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56072175A Granted JPS57187522A (en) | 1981-05-15 | 1981-05-15 | Incinerating system for urban refuge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57187522A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS604726A (en) * | 1983-06-23 | 1985-01-11 | Matsushita Electric Ind Co Ltd | Combustion apparatus for hot water supply |
-
1981
- 1981-05-15 JP JP56072175A patent/JPS57187522A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57187522A (en) | 1982-11-18 |
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