JPH0419308Y2 - - Google Patents
Info
- Publication number
- JPH0419308Y2 JPH0419308Y2 JP1984069051U JP6905184U JPH0419308Y2 JP H0419308 Y2 JPH0419308 Y2 JP H0419308Y2 JP 1984069051 U JP1984069051 U JP 1984069051U JP 6905184 U JP6905184 U JP 6905184U JP H0419308 Y2 JPH0419308 Y2 JP H0419308Y2
- Authority
- JP
- Japan
- Prior art keywords
- concentration
- fluidized bed
- amount
- exhaust gas
- sox
- 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
- 239000007789 gas Substances 0.000 claims description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 9
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 claims 6
- 238000006243 chemical reaction Methods 0.000 claims 1
- 239000003610 charcoal Substances 0.000 description 7
- 239000010801 sewage sludge Substances 0.000 description 7
- 229940043430 calcium compound Drugs 0.000 description 5
- 150000001674 calcium compounds Chemical class 0.000 description 5
- 239000003245 coal Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- -1 charcoal Chemical class 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Landscapes
- Incineration Of Waste (AREA)
Description
〔産業上の利用分野〕
本考案は流動層燃焼装置にかかわり、特に、排
ガス中の窒素酸化物NOxの濃度の低減を図つた
流動層燃焼装置に関するものである。
〔従来の技術〕
例えば、燃料としての下水汚泥中には、成分と
して硫黄、窒素、塩素等を含有しているため、焼
却、すなわち燃焼によつて発生する排ガス中には
多量の硫黄酸化物SOx、窒素酸化物NOx、塩化水
素HCを含有する。これら有害ガスの処理方式
としては、アルカリ洗浄による湿式処理、カルシ
ウム化合物の添加による乾式処理等があるが、メ
ンテナンスの容易さ、ユーテイリテイの安さなど
の点から乾式処理が多く採用されている。
乾式処理方式において、例えばカルシウム化合
物として炭酸カルシウム（以下炭カルと記す）を
用い、これを下水汚泥と混合して焼却を行うか、
または炭カルを炉内に直接噴霧する場合には、従
来、排ガス中のSOx濃度を検出して得た信号を用
いて炭カルの添加量を制御している。しかしなが
ら、この制御方式では、排ガス中のSOx濃度は低
減できるが、逆にNOx濃度は増加する傾向があ
り、現行の公害規制を達成できないという問題が
あることがわかつた。
〔考案が解決しようとする問題点〕
本考案の目的は、上記した従来技術の欠点をな
くし、排ガス中のSOx濃度を著しく増加させるこ
となくNOx濃度を低減できるようにした流動層
燃焼装置を提供するにある。
〔問題点を解決するための手段〕
本考案は、排ガス中のSOxの濃度を検出して得
られる信号を、さらに該排ガス中のNOxの濃度
を検出して得られる信号により補正した信号を用
いて炭カル等のカルシウム化合物の添加量を制御
する制御部を設けるもので、従来のようにSOx濃
度のみでなく、NOx濃度をも制御信号に取り入
れて添加量制御を行うことにより、NOx濃度の
低減を図つたものである。
さらに、流動化空気量と２次空気量との配分割
合を変える手段を具備させ、SOxとNOxの濃度を
一層低減させるようにしている。
〔作用〕
例えば、下水汚泥の焼却炉として流動層炉を用
い、添加するカルシウム化合物として炭カルを用
い、本考案による制御を行つた場合と従来法によ
る制御を行つた場合の運転データの例を表１に示
す。
[Industrial Field of Application] The present invention relates to a fluidized bed combustion apparatus, and particularly relates to a fluidized bed combustion apparatus that aims to reduce the concentration of nitrogen oxides NO x in exhaust gas. [Prior art] For example, sewage sludge as a fuel contains components such as sulfur, nitrogen, and chlorine, so a large amount of sulfur oxides (SO x , nitrogen oxides NOx , and hydrogen chloride HC. Methods for treating these harmful gases include wet treatment using alkali cleaning and dry treatment using addition of calcium compounds, but dry treatment is often adopted due to its ease of maintenance and low utility costs. In the dry treatment method, for example, calcium carbonate (hereinafter referred to as charcoal) is used as the calcium compound, and this is mixed with sewage sludge and incinerated, or
Alternatively, in the case of directly spraying charcoal into the furnace, conventionally, the amount of charcoal added is controlled using a signal obtained by detecting the SO x concentration in the exhaust gas. However, although this control method can reduce the SOx concentration in the exhaust gas, it has been found that the NOx concentration tends to increase, making it impossible to meet current pollution regulations. [Problems to be solved by the invention] The purpose of the invention is to eliminate the above-mentioned drawbacks of the conventional technology and to provide a fluidized bed combustion device that can reduce the NO x concentration without significantly increasing the SO x concentration in the exhaust gas. is to provide. [Means for solving the problem] The present invention provides a signal obtained by correcting a signal obtained by detecting the concentration of SO x in exhaust gas by a signal obtained by further detecting the concentration of NO x in the exhaust gas. This system is equipped with a control unit that controls the addition amount of calcium compounds such as charcoal, and by incorporating not only the SO x concentration as in the past, but also the NO x concentration into the control signal to control the addition amount. , which aims to reduce the NO x concentration. Furthermore, a means for changing the distribution ratio between the fluidizing air amount and the secondary air amount is provided to further reduce the concentrations of SO x and NO x . [Operation] For example, the following is an example of operational data when a fluidized bed furnace is used as a sewage sludge incinerator, charcoal is used as the added calcium compound, and control is performed according to the present invention and when control is performed according to the conventional method. It is shown in Table 1.
【表】
表１において、データａおよびｂは、SOx濃度
に基づく信号を用いて制御する従来法の場合のデ
ータであり、このようにSOx濃度は低減するが、
NOx濃度は比較的高い値を示している。また、
データｃは、同じくSOx濃度に基づく信号を用い
て炭カル量を制御した場合のデータであるが、デ
ータａ，ｂに比べてNOx濃度は低減している。
一方、データｄは、SOx濃度に基づく信号を、
NOx濃度に基づく信号により補正した信号を用
いて炭カル量を制御する本考案の制御方式の場合
のデータであるが、SOx濃度、NOx濃度とも低減
し、かつ炭カル添加量も少なくなることがわかつ
た。
次に、空気の配分を変えた場合の運転データの
例を表２に示す。[Table] In Table 1, data a and b are data for the conventional method that uses a signal based on the SO x concentration, and although the SO x concentration is reduced in this way,
The NO x concentration shows a relatively high value. Also,
Data c is data obtained when the amount of coal is controlled using a signal based on the SO x concentration, but the NO x concentration is reduced compared to data a and b. On the other hand, data d is a signal based on SO x concentration,
This data is for the control method of the present invention, which controls the amount of carbon cal using a signal corrected by a signal based on the NO x concentration, and it shows that both the SO x concentration and NO I found out that it would happen. Next, Table 2 shows examples of operating data when the air distribution is changed.
本考案による具体的実施例を下水汚泥の焼却装
置を例として、その構成を第１図に示す。図にお
いて、下水汚泥１は、連続的に混合機４に投入さ
れる。一方、炭カル２は炭カルホツパ３に貯留さ
れ、可変速モートル５を駆動してホツパの底を開
くことにより、後記する投入量の炭カルが混合機
４に投入される。混合機４で炭カルと混合された
下水汚泥は、流動層式の焼却炉６に送られ、焼却
される。焼却によつて発生した排ガスは、熱交換
器７、吸出し送風機８を経て、煙突９から排出さ
れる。煙突９を通る排ガスのSOx濃度とNOx濃度
はSOx濃度検出器１０およびNOx濃度検出器１１
により検出され、それぞれの検出信号は制御器１
２に送られる。制御器１２では、SOx、NOxの各
濃度に応じた炭カルの投入量を決定し、可変速モ
ートル５を駆動させて、該投入量の炭カルをホツ
パ３から混合機に投入させる。
〔考案の効果〕
本考案の流動層燃焼装置によれば、排ガス中の
SOx濃度を著しく増加させることなくNOx濃度を
低減することができるので、カルシウム化合物の
添加によつてSOx濃度のみならずNOx濃度をも規
制することが可能となる。
A specific embodiment of the present invention is shown in FIG. 1, taking a sewage sludge incinerator as an example. In the figure, sewage sludge 1 is continuously fed into a mixer 4. On the other hand, the coal sludge 2 is stored in a sludge hopper 3, and by driving the variable speed motor 5 to open the bottom of the hopper, the amount of sludge described later is charged into the mixer 4. The sewage sludge mixed with coal sludge in the mixer 4 is sent to a fluidized bed incinerator 6 and incinerated. Exhaust gas generated by incineration passes through a heat exchanger 7 and a suction blower 8, and is discharged from a chimney 9. The SO x concentration and NO x concentration of the exhaust gas passing through the chimney 9 are determined by the SO x concentration detector 10 and the NO x concentration detector 11.
are detected by the controller 1, and each detection signal is detected by the controller 1.
Sent to 2. The controller 12 determines the amount of coal to be fed in accordance with each concentration of SO x and NO x and drives the variable speed motor 5 to feed the amount of coal from the hopper 3 into the mixer. [Effects of the invention] According to the fluidized bed combustion apparatus of the invention, the amount of
Since the NO x concentration can be reduced without significantly increasing the SO x concentration, the addition of a calcium compound makes it possible to regulate not only the SO x concentration but also the NO x concentration.
第１図は本考案による流動層燃焼装置の構成の
一例を示す模式図である。
符号の説明、１……下水汚泥、２……炭カル、
３……炭カルホツパ、４……混合機、５……可変
速モートル、６……焼却炉、７……熱交換器、８
……吸出し送風機、９……煙突、１０……SOx濃
度検出器、１１……NOx濃度検出器、１２……
制御器。
FIG. 1 is a schematic diagram showing an example of the configuration of a fluidized bed combustion apparatus according to the present invention. Explanation of symbols, 1...Sewage sludge, 2...Charcoal,
3...Charcoal carhopper, 4...Blender, 5...Variable speed motor, 6...Incinerator, 7...Heat exchanger, 8
...Suction blower, 9...Chimney, 10...SO x concentration detector, 11...NO x concentration detector, 12...
controller.
Claims (1)
炭酸カルシウムを加えて流動層燃焼させることに
より除去する乾式排ガス処理機能を備えた流動層
燃焼装置において、排ガス中の硫黄酸化物SOxの
濃度を検出して得られる炭酸カルシウムの必要添
加量の信号を、上記SOxとは逆の反応特性を示す
排ガス中の窒素酸化物NOxの濃度を検出して得
られる炭酸カルシウムの必要添加量の信号によ
り、上記SOx濃度から得られた炭酸カルシウムの
必要添加量の信号を減少させる方向に修正して、
SOx濃度を設定値以上に増加させることなく
NOx濃度を低減させる制御手段と、さらに上記
流動層に供給する流動化空気量と燃焼用２次空気
量との配分割合を調整することにより、排ガス中
のSOxおよびNOx濃度をそれぞれ設定値以下に
低減させる制御手段とを備えたことを特徴とする
流動層燃焼装置。 Harmful gas components generated from fluidized bed combustion furnaces are
In a fluidized bed combustion equipment equipped with a dry exhaust gas treatment function that removes calcium carbonate by adding it and burning it in a fluidized bed, a signal indicating the required amount of calcium carbonate to be added is obtained by detecting the concentration of sulfur oxide (SOx) in the exhaust gas. , the necessary addition amount of calcium carbonate obtained from the above SOx concentration is determined by the signal of the necessary addition amount of calcium carbonate obtained by detecting the concentration of nitrogen oxide NOx in the exhaust gas, which has reaction characteristics opposite to those of SOx. Modify to reduce the signal,
without increasing SOx concentration beyond the set value
The SOx and NOx concentrations in the exhaust gas are reduced to below the respective set values by using a control means for reducing the NOx concentration and further adjusting the distribution ratio between the amount of fluidizing air supplied to the fluidized bed and the amount of secondary air for combustion. A fluidized bed combustion apparatus characterized by comprising a control means for reducing the amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6905184U JPS60181539U (en) | 1984-05-14 | 1984-05-14 | Sewage sludge incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6905184U JPS60181539U (en) | 1984-05-14 | 1984-05-14 | Sewage sludge incinerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60181539U JPS60181539U (en) | 1985-12-02 |
| JPH0419308Y2 true JPH0419308Y2 (en) | 1992-04-30 |
Family
ID=30604363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6905184U Granted JPS60181539U (en) | 1984-05-14 | 1984-05-14 | Sewage sludge incinerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60181539U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH076619B2 (en) * | 1986-05-31 | 1995-01-30 | 三菱重工業株式会社 | Sludge supply method for fluidized bed sludge combustion furnace |
| JP7117916B2 (en) * | 2018-06-29 | 2022-08-15 | 月島機械株式会社 | Sewage sludge incineration method using fluidized bed incinerator, and incineration equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5411530A (en) * | 1977-06-29 | 1979-01-27 | Babcock Hitachi Kk | Fluidzed bed type combustion device with reduced nox |
| JPS5533510A (en) * | 1978-08-31 | 1980-03-08 | Babcock Hitachi Kk | Fluidized bed combustion control method |
| JPS5861181A (en) * | 1981-10-08 | 1983-04-12 | Agency Of Ind Science & Technol | Method and apparatus for treating harmful component in the thermal treatment of waste |
| JPS5948407B2 (en) * | 1978-02-22 | 1984-11-26 | 松下電器産業株式会社 | Rotational phase detection circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5948407U (en) * | 1982-09-21 | 1984-03-30 | バブコツク日立株式会社 | Fluidized bed combustion equipment |
-
1984
- 1984-05-14 JP JP6905184U patent/JPS60181539U/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5411530A (en) * | 1977-06-29 | 1979-01-27 | Babcock Hitachi Kk | Fluidzed bed type combustion device with reduced nox |
| JPS5948407B2 (en) * | 1978-02-22 | 1984-11-26 | 松下電器産業株式会社 | Rotational phase detection circuit |
| JPS5533510A (en) * | 1978-08-31 | 1980-03-08 | Babcock Hitachi Kk | Fluidized bed combustion control method |
| JPS5861181A (en) * | 1981-10-08 | 1983-04-12 | Agency Of Ind Science & Technol | Method and apparatus for treating harmful component in the thermal treatment of waste |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60181539U (en) | 1985-12-02 |
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