JPH05247471A - Ethylene cracker - Google Patents
Ethylene crackerInfo
- Publication number
- JPH05247471A JPH05247471A JP3241495A JP24149591A JPH05247471A JP H05247471 A JPH05247471 A JP H05247471A JP 3241495 A JP3241495 A JP 3241495A JP 24149591 A JP24149591 A JP 24149591A JP H05247471 A JPH05247471 A JP H05247471A
- Authority
- JP
- Japan
- Prior art keywords
- heat transfer
- waste gas
- combustion chamber
- combustion
- convection heat
- 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.)
- Pending
Links
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Abstract
(57)【要約】
【目的】 プラント全体の効率を高めながら低ＮＯx 化
が図れるエチレン分解炉を提供すること。
【構成】 燃焼室１と、該燃焼室で生じた燃焼廃ガスを
導入するようにした対流伝熱部２４からなるエチレン分
解炉であって、燃焼廃ガスの温度が２５０〜４００℃と
なる対流伝熱部の燃焼廃ガスゾーンに固定床式脱硝設備
１６を設けると共に、該脱硝設備より燃焼室側に位置す
る対流部伝熱管群１４3,１４4 間に還元剤供給設備２１
を配設した。
(57) [Summary] [Objective] To provide an ethylene cracking furnace capable of reducing NO x while increasing the efficiency of the entire plant. An ethylene decomposition furnace comprising a combustion chamber 1 and a convection heat transfer section 24 for introducing combustion waste gas generated in the combustion chamber, wherein the temperature of the combustion waste gas is 250 to 400 ° C. A fixed bed denitration equipment 16 is provided in the combustion waste gas zone of the heat transfer portion, and a reducing agent supply equipment 21 is provided between the convection heat transfer tube groups 14 3 and 14 4 located on the combustion chamber side of the denitration equipment.
Was arranged.
Description
【０００１】[0001]
【産業上の利用分野】本発明はプラント全体の効率を上
げながら低ＮＯx 化が図れるエチレン分解炉に関するも
のである。The present invention relates to relates to ethylene cracking furnaces low NO x reduction can be achieved while increasing the efficiency of the entire plant.
【０００２】[0002]
【従来技術】従来のエチレン分解炉は、低ＮＯx バーナ
等を用いて燃焼改善によるＮＯx 低減が主体であった。
今後、プラントの効率を上げるためにエチレン分解炉に
ガスタービンを組み込み、この廃ガスをエチレン分解炉
用燃焼空気源として利用するシステムの導入が考えられ
る。2. Description of the Related Art Conventional ethylene cracking furnaces have been mainly used to reduce NO x by improving combustion by using a low NO x burner or the like.
In the future, in order to increase the efficiency of the plant, it is possible to install a gas turbine in the ethylene cracking furnace and introduce a system that uses this waste gas as a combustion air source for the ethylene cracking furnace.
【０００３】しかし、この場合、エチレン分解炉の煙突
よりの廃ガス中のＮＯx が大幅に上がる（１００〜３０
０ppm)。このため、脱硝設備等の必要性が出てくる。エ
チレン分解炉に脱硝設備を組み込む場合、次のような考
慮が必要になる。即ち、 （イ）高脱硝率を維持するため脱硝設備は、２５０〜４
００℃の温度範囲の燃焼廃ガスゾーンに設ける必要があ
ること。However, in this case, the NO x in the exhaust gas from the stack of the ethylene cracking furnace significantly increases (100 to 30).
0 ppm). For this reason, the need for denitration equipment and the like comes out. When incorporating denitration equipment into an ethylene decomposition furnace, the following considerations are necessary. That is, (a) the denitration equipment is 250 to 4 in order to maintain a high denitration rate.
Must be installed in the combustion exhaust gas zone in the temperature range of 00 ° C.
【０００４】（ロ）脱硝設備のトラブル（活性低下、目
づまり、還元剤のリークなどのトラブル）に伴ってプラ
ント全体がストップしないような分解炉全体のシステム
が構築されていること。 （ハ）触媒の出し入れが容易で、かつ、高所作業等がな
い設備とすること。 （ニ）脱硝設備後の燃焼廃ガス温度は２５０〜４００℃
となるため、分解炉全体の熱効率アップを図るために脱
硝設備の後にエコノマイザー、空気予熱器、原料予熱器
等を設けて熱回収を図ること。 （ホ）還元剤が燃焼廃ガス中に均等に分散されること。(B) A system for the entire decomposition furnace is constructed so that the entire plant will not be stopped due to troubles (deterioration, clogging, leak of reducing agent, etc.) of the denitration equipment. (C) A facility where the catalyst can be easily taken in and out, and there is no work at heights. (D) Combustion waste gas temperature after denitration equipment is 250-400 ℃
Therefore, in order to improve the thermal efficiency of the entire decomposition furnace, an economizer, air preheater, raw material preheater, etc. should be installed after the denitration equipment to recover heat. (E) The reducing agent should be evenly dispersed in the combustion exhaust gas.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、かかる要望
に応えるためになされたものであり、その目的とすると
ころは、プラント全体の効率を高めながら低ＮＯx 化が
図れるエチレン分解炉を提供することにある。[SUMMARY OF THE INVENTION The present invention has been made in order to meet such demands, it is an object of providing ethylene cracking furnace low NO x reduction can be achieved while increasing the efficiency of the entire plant To do.
【０００６】[0006]
【課題を解決するための手段】すなわち、本発明のエチ
レン分解炉は、燃焼室と、該燃焼室で生じた燃焼廃ガス
を導入するようにした対流伝熱部からなるエチレン分解
炉であって、前記燃焼廃ガスの温度が２５０〜４００℃
となる対流伝熱部の燃焼廃ガスゾーンに固定床式脱硝設
備を設けると共に、該脱硝設備より燃焼室側に位置する
対流伝熱管群間に還元剤供給設備を配設したことを特徴
とするものである。That is, an ethylene cracking furnace of the present invention is an ethylene cracking furnace comprising a combustion chamber and a convection heat transfer section for introducing combustion waste gas generated in the combustion chamber. , The temperature of the combustion waste gas is 250 to 400 ° C.
A fixed bed type denitration equipment is provided in the combustion waste gas zone of the convection heat transfer section, and a reducing agent supply equipment is arranged between the convection heat transfer tube groups located on the combustion chamber side of the denitration equipment. It is a thing.
【０００７】[0007]
【実施例】以下、図面により本発明の一実施例について
説明する。図１は本発明にかかるエチレン分解炉の縦断
面図であり、このエチレン分解炉２５は、燃焼室１と、
対流伝熱部２４とが並設されている。しかも、燃焼室１
の下部と対流伝熱部２４の下部とが接続ダクト５によっ
て連通されており、全体としてＵ字状を呈している。燃
焼室１内に垂直に配設された反応管２は燃焼室１の天井
に設けられたバーナ４によって加熱されるようになって
いる。反応管２は急冷熱交換器１２と接続しており、分
解された炭化水素ガスを冷却するようになっている。こ
の冷却は、高圧水を用いて行われ、発生した高圧蒸気は
スチームドラム１３に導入されるようになっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of an ethylene decomposition furnace according to the present invention. The ethylene decomposition furnace 25 includes a combustion chamber 1,
The convection heat transfer part 24 is provided side by side. Moreover, the combustion chamber 1
And the lower part of the convection heat transfer part 24 are connected by the connection duct 5, and have a U shape as a whole. The reaction tube 2 vertically arranged in the combustion chamber 1 is heated by a burner 4 provided on the ceiling of the combustion chamber 1. The reaction tube 2 is connected to the quenching heat exchanger 12, and cools the decomposed hydrocarbon gas. This cooling is performed using high pressure water, and the generated high pressure steam is introduced into the steam drum 13.
【０００８】前述した燃焼室１は、燃焼室壁３によって
囲まれており、室内温度は１０００〜１２００℃になっ
ている。燃焼廃ガスは、燃焼室１の下部より接続ダクト
５を通って下部対流伝熱部７に導入される。この下部対
流伝熱部７は、下部対流部伝熱管群１４1,１４2,１４3,
１４4 と対流伝熱部壁１１によって構成されている。こ
の下部対流伝熱部７の上部には、脱硝設備１６を設けて
いる。この脱硝設備１６の入口部９の温度は、脱硝率を
上げるため３００〜４００℃とする。より望ましい温度
は、負荷低下時、デコーキング時の温度変化を考えて３
００〜３８０℃である。The above-mentioned combustion chamber 1 is surrounded by the combustion chamber wall 3, and the room temperature is 1000 to 1200 ° C. The combustion exhaust gas is introduced into the lower convection heat transfer section 7 from the lower portion of the combustion chamber 1 through the connection duct 5. The lower convection heat transfer section 7 includes a lower convection section heat transfer tube group 14 1 , 14 2, 14 3,
14 4 and the convection heat transfer section wall 11. A denitration facility 16 is provided above the lower convection heat transfer section 7. The temperature of the inlet 9 of the denitration equipment 16 is set to 300 to 400 ° C. in order to increase the denitration rate. A more desirable temperature is 3 considering the temperature change during load reduction and decoking.
It is 00-380 degreeC.
【０００９】脱硝設備１６は、固定床式触媒と、これを
保持するケーシング又はサポート等より構成されてい
る。この脱硝設備１６より出た燃焼廃ガスは上部対流伝
熱部８の上部対流部伝熱管群１５1,１５2 、並びに空気
予熱器１７にて熱回収される。この空気予熱器１７を出
た燃焼廃ガスは、誘引ファン１８並びに煙突２０を通っ
て大気中に放出される。空気予熱器１７では、押込ファ
ン１９によって燃焼廃ガスと熱交換された予熱空気が空
気ダクト２２を通ってバーナ４に導入される。１０は脱
硝設備出口である。The denitration equipment 16 comprises a fixed bed catalyst and a casing or support for holding the catalyst. The combustion waste gas discharged from the denitration equipment 16 is recovered by the upper convection heat transfer tube groups 15 1 and 15 2 of the upper convection heat transfer portion 8 and the air preheater 17. The combustion waste gas that has left the air preheater 17 is discharged into the atmosphere through the induction fan 18 and the chimney 20. In the air preheater 17, the preheated air that has undergone heat exchange with the combustion waste gas by the pushing fan 19 is introduced into the burner 4 through the air duct 22. 10 is an outlet for denitration equipment.
【００１０】一方、ＮＯx 還元用のアンモニア（Ｎ
Ｈ3 ）は、アンモニア供給管２１を通って下部対流部伝
熱管群１４3,１４4 の間に導入される。そして、アンモ
ニア供給管２１の下流側にある下部対流部伝熱管群１４
4 内を通過する間に燃焼廃ガスと均一に混合し、脱硝設
備１６に導入される。アンモニアの導入は、廃ガス温度
が５５０℃以下の下部対流部伝熱管群の中間が望まし
く、このためにも脱硝設備１６の上流側に２段以上の伝
熱管群を設ける必要がある。On the other hand, ammonia for reducing NO x (N
H 3 ) is introduced between the lower convection section heat transfer tube groups 14 3 and 14 4 through the ammonia supply tube 21. Then, the lower convection section heat transfer tube group 14 on the downstream side of the ammonia supply tube 21
While passing through the inside 4 , it is uniformly mixed with the combustion waste gas and introduced into the denitration equipment 16. Ammonia is preferably introduced in the middle of the lower convection heat transfer tube group having a waste gas temperature of 550 ° C. or lower. For this reason, it is necessary to provide two or more heat transfer tube groups on the upstream side of the denitration equipment 16.
【００１１】以上の説明の以外に、図２に示すように、
空気予熱器１７を上部対流部伝熱管１５を挾んで１段に
設けてもよい。また、図３に示すように、空気予熱器１
７のみを設けてもよい。また、図４に示すように、上部
対流部伝熱管１５のみを設けてもよい。In addition to the above description, as shown in FIG.
The air preheater 17 may be provided in one stage with the upper convection section heat transfer tube 15 interposed. Further, as shown in FIG. 3, the air preheater 1
Only 7 may be provided. Further, as shown in FIG. 4, only the upper convection section heat transfer tube 15 may be provided.
【００１２】[0012]
【発明の効果】上記のように、本発明は、燃焼室と、該
燃焼室で生じた燃焼廃ガスを導入するようにした対流伝
熱部からなるエチレン分解炉であって、前記燃焼廃ガス
の温度が２５０〜４００℃となる対流伝熱部の燃焼廃ガ
スゾーンに固定床式脱硝設備を設けると共に、該脱硝設
備より燃焼室側に位置する対流伝熱管群間に還元剤供給
設備を配設したので、アンモニアのリークなどのトラブ
ルがなく、高脱硝率下で低ＮＯx 化を図ることができる
ようになった。また、触媒の出し入れが簡単に行えるよ
うになり、しかも、高所作業等の危険も解消されるよう
になった。As described above, the present invention is an ethylene decomposition furnace comprising a combustion chamber and a convection heat transfer section for introducing the combustion waste gas generated in the combustion chamber, wherein the combustion waste gas The fixed-bed denitration equipment is provided in the combustion waste gas zone of the convection heat transfer part where the temperature of 250 to 400 ° C. and the reducing agent supply equipment is arranged between the convection heat transfer tube groups located on the combustion chamber side of the denitration equipment. Since it is installed, there is no trouble such as leakage of ammonia, and it has become possible to achieve low NO x under a high denitration rate. In addition, the catalyst can be easily taken in and out, and the danger of working in high places can be eliminated.
【図１】本発明にかかるエチレン分解炉の縦断面図であ
る。FIG. 1 is a vertical sectional view of an ethylene decomposition furnace according to the present invention.
【図２】上部対流伝熱部の他の例を示す縦断面図であ
る。FIG. 2 is a vertical cross-sectional view showing another example of the upper convection heat transfer section.
【図３】上部対流伝熱部の他の例を示す縦断面図であ
る。FIG. 3 is a vertical cross-sectional view showing another example of the upper convection heat transfer section.
【図４】上部対流伝熱部の他の例を示す縦断面図であ
る。FIG. 4 is a vertical cross-sectional view showing another example of the upper convection heat transfer section.
１ 燃焼室 １６ 脱硝設備 ２４ 対流伝熱部 １４1 〜１４4 対流部伝熱管群 ２１ 還元剤供給設備 ２５ エチレン分解炉DESCRIPTION OF SYMBOLS 1 Combustion chamber 16 Denitration equipment 24 Convection heat transfer section 14 1 to 14 4 Convection section heat transfer tube group 21 Reductant supply equipment 25 Ethylene decomposition furnace
Claims (1)
を導入するようにした対流伝熱部からなるエチレン分解
炉であって、前記燃焼廃ガスの温度が２５０〜４００℃
となる対流伝熱部の燃焼廃ガスゾーンに固定床式脱硝設
備を設けると共に、該脱硝設備より燃焼室側に位置する
対流伝熱管群間に還元剤供給設備を配設したエチレン分
解炉。1. An ethylene decomposition furnace comprising a combustion chamber and a convection heat transfer section for introducing the combustion waste gas generated in the combustion chamber, wherein the temperature of the combustion waste gas is 250 to 400 ° C.
An ethylene decomposition furnace in which a fixed bed type denitration equipment is provided in the combustion waste gas zone of the convection heat transfer section, and a reducing agent supply equipment is arranged between convection heat transfer tube groups located on the combustion chamber side of the denitration equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3241495A JPH05247471A (en) | 1991-09-20 | 1991-09-20 | Ethylene cracker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3241495A JPH05247471A (en) | 1991-09-20 | 1991-09-20 | Ethylene cracker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05247471A true JPH05247471A (en) | 1993-09-24 |
Family
ID=17075175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3241495A Pending JPH05247471A (en) | 1991-09-20 | 1991-09-20 | Ethylene cracker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05247471A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004530538A (en) * | 2001-02-26 | 2004-10-07 | エイビービー ラマス グローバル インコーポレイテッド | Reactor and method for reducing nitrogen oxides content of gas |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5778929A (en) * | 1980-11-06 | 1982-05-17 | Babcock Hitachi Kk | Denitrification of waste gas from steam reforming furnace |
-
1991
- 1991-09-20 JP JP3241495A patent/JPH05247471A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5778929A (en) * | 1980-11-06 | 1982-05-17 | Babcock Hitachi Kk | Denitrification of waste gas from steam reforming furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004530538A (en) * | 2001-02-26 | 2004-10-07 | エイビービー ラマス グローバル インコーポレイテッド | Reactor and method for reducing nitrogen oxides content of gas |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19980421 |