JPH0131084B2 - - Google Patents
Info
- Publication number
- JPH0131084B2 JPH0131084B2 JP57006858A JP685882A JPH0131084B2 JP H0131084 B2 JPH0131084 B2 JP H0131084B2 JP 57006858 A JP57006858 A JP 57006858A JP 685882 A JP685882 A JP 685882A JP H0131084 B2 JPH0131084 B2 JP H0131084B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- boiler
- fly ash
- low
- dust collector
- 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
- 238000000034 method Methods 0.000 claims description 19
- 239000010881 fly ash Substances 0.000 claims description 17
- 239000000428 dust Substances 0.000 claims description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 9
- 229910021529 ammonia Inorganic materials 0.000 claims description 4
- 230000003134 recirculating effect Effects 0.000 claims 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical class [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims 1
- 150000003863 ammonium salts Chemical class 0.000 claims 1
- 238000010531 catalytic reduction reaction Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 28
- 150000003839 salts Chemical class 0.000 description 14
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 7
- 229910052815 sulfur oxide Inorganic materials 0.000 description 6
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 238000009841 combustion method Methods 0.000 description 3
- 238000000586 desensitisation Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/06—Systems for accumulating residues from different parts of furnace plant
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chimneys And Flues (AREA)
Description
【発明の詳細な説明】
石炭だきボイラーに於て、窒素酸化物（以下
NOXという）の排出量を抑える経済的方法とし
て、２段燃焼あるいは排ガス循環方式による低
NOX燃焼方式により、出来るかぎりボイラーか
らのNOX発生量をおさえたのち、ボイラー排ガ
スを脱硝装置に導入し、NOX排出量を抑えてい
る。[Detailed description of the invention] In a coal-fired boiler, nitrogen oxides (hereinafter referred to as
As an economical way to reduce NOx (NOx) emissions, two-stage combustion or exhaust gas circulation methods are used
The NOX combustion method suppresses the amount of NOX emitted from the boiler as much as possible, and then the boiler exhaust gas is introduced into the denitrification equipment to reduce NOX emissions.
脱硝装置としては、現在では乾式のアンモニア
接触分解方式が主流である。ところが、上記脱硝
装置を用いると、脱硝装置からの漏洩アンモニア
と排ガス中の硫黄酸化物により硫酸アンモニウム
塩（以下NH4塩という）が生成し、NH4塩を含
んだガスが冷却されると、NH4塩を析出する。
しかもガス中に微細なフライアツシユが存在する
と、NH4塩は優先的に上記フライアツシユ表面
に析出する。従つて脱硝装置より後の流れに低温
EP4を設けた場合には、低温EPで捕集したフラ
イアツシユにはNH4塩が付着している。 Dry ammonia catalytic cracking systems are currently the mainstream denitrification equipment. However, when the above denitrification equipment is used, ammonium sulfate salt (hereinafter referred to as NH 4 salt) is produced by leaking ammonia from the denitrification equipment and sulfur oxide in the exhaust gas, and when the gas containing NH 4 salt is cooled, NH 4 salt is produced. 4 Precipitate the salt.
Moreover, if fine fly ash is present in the gas, the NH 4 salt is preferentially deposited on the surface of the fly ash. Therefore, the flow after the denitrification equipment has a low temperature.
When EP4 is installed, NH 4 salts are attached to the flyash collected by low-temperature EP.
本発明はかゝるフライアツシユからNH4塩を
分解・脱離（以下脱安という）するプロセスに関
するもので、極めて簡単なプロセスで、しかも低
いランニングコストの脱安プロセスを提供しよう
とするものである。 The present invention relates to a process for decomposing and removing NH 4 salt from such fly ash (hereinafter referred to as de-anxification), and aims to provide a de-anxification process that is extremely simple and has low running costs. .
現在脱安プロセスとして確立されたものはない
が、従来から一般的に第１図のものがしられてい
る。石炭だきボイラー１から発生したフライアツ
シユは、脱硝装置２及び空気予熱機３を通過する
ことによつて表面にNH4塩を付着した状態で低
温EP4で捕集される。低温EP4で捕集されたNH4
塩の付着したフライアツシユは、脱安装置５で昇
温、脱安されて集塵機６によつて回収される。 Although there is currently no established devaluation process, the one shown in Figure 1 has been generally known for some time. Fly ash generated from the coal-fired boiler 1 passes through a denitrification device 2 and an air preheater 3, and is collected in a low-temperature EP4 with NH 4 salt attached to its surface. NH4 collected in low temperature EP4
The salt-adhered fly ash is heated and de-assembled in a de-assembled device 5, and then collected by a dust collector 6.
脱安排ガスはアンモニア源として脱硝装置２の
前に戻される。なお、脱安熱源としてはボイラー
１からの抽気ガスでも良いし、補助燃料を用いて
熱風発生炉７から発生させた熱風でもよい。勿論
両者の併用でもよい。 The desulfurized exhaust gas is returned to the front of the denitrification device 2 as an ammonia source. Note that the desulfation heat source may be extracted gas from the boiler 1, or hot air generated from the hot air generating furnace 7 using auxiliary fuel. Of course, both may be used together.
第１図のプロセスはNOX抑制方式として脱硝
装置２のみについて考慮しており、脱硝装置２と
排ガス循環方式を含む低NOX燃焼方式が併用さ
れた場合については考慮されていない。さらに脱
安装置５が必要であることから、プロセスは複雑
になる上に脱安熱源を必要とするため、脱安に要
するランニングコストは可成り高くなる。又
NH4塩の分解に際し、硫黄酸化物が発生するた
め、硫黄酸化物が濃縮され、好ましくない現象を
惹起する。 The process shown in FIG. 1 considers only the denitrification device 2 as the NOX suppression method, and does not consider the case where the denitrification device 2 and a low NOX combustion method including an exhaust gas circulation method are used together. Furthermore, since the desensitization device 5 is required, the process becomes complicated and a desensitization heat source is required, so that the running cost required for desensitization becomes considerably high. or
When NH 4 salt is decomposed, sulfur oxides are generated, which concentrates the sulfur oxides and causes undesirable phenomena.
本発明は前記の欠点を補うべくなされたもので
ある。以下これを第２図に参照に説明する。第２
図はNOX抑制方法として脱硝装置２と排ガス循
環方式を含む低NOX燃焼方式を併用した場合に
ついての脱安プロセスである。 The present invention has been made to compensate for the above-mentioned drawbacks. This will be explained below with reference to FIG. Second
The figure shows the deoxidization process when the denitrification device 2 and a low NOX combustion method including an exhaust gas circulation method are used together as a NOX suppression method.
ボイラー１より発生したフライアツシユは脱硝
装置２及び空気予熱機３を通ることによつて表面
にNH4塩が付着した状態で低温EP4で捕集され
る。低温EP4で捕集されたNH4塩の付着したフラ
イアツシユはボイラー１への循還ガス中に投入さ
れ、循環ブロワー１０の保護ために設けられた集
塵機９で回収されるまでに大量の循環ガスによつ
て昇温、脱安され集塵機９で回収される。 The fly ash generated from the boiler 1 passes through a denitrification device 2 and an air preheater 3, and is collected in a low-temperature EP4 with NH 4 salt attached to its surface. The fly ash with the NH 4 salts collected by the low-temperature EP4 is thrown into the circulating gas to the boiler 1, and is collected by the dust collector 9 installed to protect the circulating blower 10. As a result, the temperature rises, the decomposition is carried out, and the dust is collected by the dust collector 9.
ダンパー１１及び１２は循環ガス温度のコント
ロールのために設けられている。即ち、ボイラー
１の出口の主循環ガス温度が低過ぎる場合にはフ
ライアツシユの脱安率が低くなる。このような場
合ボイラー１から高温ガス（例えばエコノマイザ
ー人口ガス）を抽気し、主循環ガスに加え、一方
では主循環ガス量を減少させて、循環ガス温度を
一定に保つ為のガス量調節ダンパーとして設けら
れている。 Dampers 11 and 12 are provided for controlling the circulating gas temperature. That is, if the temperature of the main circulating gas at the outlet of the boiler 1 is too low, the fly ash release rate will be low. In such a case, high-temperature gas (for example, economizer artificial gas) is extracted from the boiler 1 and added to the main circulating gas, while a gas amount adjustment damper is used to reduce the main circulating gas amount and keep the circulating gas temperature constant. It is established as.
第２図においては、フライアツシユの投入場所
は主循環ガスとボイラー１からの抽気ガスが混合
したあとで示してあるが、ボイラー１からの抽気
ガス量を低減するためにダンパー１２の直後に投
入する方法も考えられる。 In Figure 2, the place where the fly ash is introduced is shown after the main circulation gas and the bleed gas from the boiler 1 are mixed, but in order to reduce the amount of bleed gas from the boiler 1, it is inserted immediately after the damper 12. There are other possible methods.
集塵機９を通過した清浄な循環ガスはボイラー
１に戻されるため、脱安過程で生じた硫黄酸化物
は分解され、硫黄酸化物の濃縮という現象は起ら
ない。 Since the clean circulating gas that has passed through the dust collector 9 is returned to the boiler 1, the sulfur oxides generated during the desulfurization process are decomposed, and the phenomenon of concentration of sulfur oxides does not occur.
第３図は集塵機９の効率が低く、極めて微細な
フライアツシユが集塵機９で捕集されずに循環
し、本プロセス中のフライアツシユ濃度が増加し
てしまう場合の対策例である。即ち低温EP4で捕
集したフライアツシユの極めて微細なフライアツ
シユを循環ガス中に投入する前に分級機１３でと
り除いてしまう方法である。 FIG. 3 shows an example of countermeasures taken when the efficiency of the dust collector 9 is low and extremely fine fly ash circulates without being collected by the dust collector 9, resulting in an increase in the fly ash concentration during this process. That is, this is a method in which the extremely fine fly ash collected by the low-temperature EP4 is removed by the classifier 13 before being introduced into the circulating gas.
以上の如き構成であつて、NH4塩の付着した
フライアツシユを循環ガス中に投入することによ
つて循環ガスの熱によつてフライアツシユは脱安
されるので、特殊な脱安装置を必要とせず、フラ
イアツシユからNH4塩の脱安を行うことができ
る。 With the above configuration, the fly ash with NH 4 salt adhering to it is thrown into the circulating gas, and the fly ash is de-assembled by the heat of the circulating gas, so there is no need for a special de-assembled device. NH 4 salt can be removed from the fly stock.
本発明によれば、脱安装置が必要なく、極めて
簡素化された脱安プロセスとなる。さらに脱安熱
源を必要としないので、脱安のためのランニング
コストはきわめて低く抑えることができる。 According to the present invention, there is no need for an anchoring device, resulting in an extremely simplified anchoring process. Furthermore, since a heat source for desulfurization is not required, running costs for desulfurization can be kept extremely low.
又脱安排ガスはボイラーに戻されるため、
NH4塩の分解によつて生じた硫黄酸化物は分解
され、硫黄酸化物の濃縮は起らない。 Also, since the desensitized exhaust gas is returned to the boiler,
Sulfur oxides produced by decomposition of NH 4 salts are decomposed and no concentration of sulfur oxides occurs.
第１図は従来公知石炭だきボイラ排ガスの処理
方法。第２図は本発明に係る石炭だき排ガスの処
理方法。第３図は本発明の他の実施例を示す図で
ある。
図において；１……石炭だきボイラー、２……
脱硝装置、３……空気予熱機、４……低温電気集
塵装置、５……脱安装置、６……集塵機、７……
熱風発生炉、８……回収フライアツシユ、９……
集塵機、１０……循環ブロワー、１１……ダンパ
ー、１２……ダンパー、１３……分級機。
Figure 1 shows a conventional method for treating coal-fired boiler exhaust gas. FIG. 2 shows a method for treating coal-fired exhaust gas according to the present invention. FIG. 3 is a diagram showing another embodiment of the present invention. In the diagram; 1...coal-fired boiler, 2...
Denitrification device, 3... Air preheater, 4... Low temperature electrostatic precipitator, 5... Desulfurization device, 6... Dust collector, 7...
Hot air generating furnace, 8... Recovery fly assembly, 9...
Dust collector, 10... circulation blower, 11... damper, 12... damper, 13... classifier.
Claims (1)
方式の脱硝装置に導入して脱硝し、低温集塵装置
に導入して除塵し、かつ、ボイラ出口排ガスの一
部を前記ボイラに再循環する方法において、前記
低温集塵装置で捕集したアンモニウム塩付着フラ
イアツシユを前記再循環排ガス中へ導入してアン
モニウム塩を分解脱離し、さらに再循環排ガスラ
イン中に設けた集塵装置によつてフライアツシユ
を除去することを特徴とする石炭だきボイラ排ガ
スの処理方法。1. A method in which coal-fired boiler exhaust gas is introduced into an ammonia catalytic reduction type denitrification device to denitrify it, introduced into a low-temperature dust collector to remove dust, and a part of the boiler outlet exhaust gas is recirculated to the boiler. The ammonium salt-adhered fly ash collected by the low-temperature dust collector is introduced into the recirculating exhaust gas to decompose and remove the ammonium salt, and the fly ash is further removed by a dust collector installed in the recirculating exhaust gas line. Features: A method for treating coal-fired boiler exhaust gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57006858A JPS58124115A (en) | 1982-01-21 | 1982-01-21 | Processing method of waste gas of coal boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57006858A JPS58124115A (en) | 1982-01-21 | 1982-01-21 | Processing method of waste gas of coal boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58124115A JPS58124115A (en) | 1983-07-23 |
| JPH0131084B2 true JPH0131084B2 (en) | 1989-06-23 |
Family
ID=11649930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57006858A Granted JPS58124115A (en) | 1982-01-21 | 1982-01-21 | Processing method of waste gas of coal boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58124115A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6439138B1 (en) | 1998-05-29 | 2002-08-27 | Hamon Research-Cottrell, Inc. | Char for contaminant removal in resource recovery unit |
-
1982
- 1982-01-21 JP JP57006858A patent/JPS58124115A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58124115A (en) | 1983-07-23 |
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