JPH07278553A - Removal of naphthalene deposited by cooling of coke oven gas - Google Patents

Removal of naphthalene deposited by cooling of coke oven gas

Info

Publication number
JPH07278553A
JPH07278553A JP7344894A JP7344894A JPH07278553A JP H07278553 A JPH07278553 A JP H07278553A JP 7344894 A JP7344894 A JP 7344894A JP 7344894 A JP7344894 A JP 7344894A JP H07278553 A JPH07278553 A JP H07278553A
Authority
JP
Japan
Prior art keywords
coke oven
cooling
oven gas
tar
gas
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.)
Withdrawn
Application number
JP7344894A
Other languages
Japanese (ja)
Inventor
Iku Abe
郁 安倍
Junji Tamura
田村順二
Takayuki Araki
荒木孝之
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP7344894A priority Critical patent/JPH07278553A/en
Publication of JPH07278553A publication Critical patent/JPH07278553A/en
Withdrawn legal-status Critical Current

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Abstract

PURPOSE:To reduce the amount of tar to be added to a cooling medium at the final cooling stage by improving the naphthaleneabsorption efficiency to tar without varying the operation condition of the final cooling stage of a coke oven gas. CONSTITUTION:Coke oven gas is directly cooled by spraying a cooling medium into the coke oven gas after removing hydrogen sulfide and ammonia from the gas and gas oil is removed from the cooled coke oven gas. In this process, the cooling of the coke oven gas is carried out by adding tar to the cooling medium, stirring and mixing with a stirrer and spraying the mixture into the coke oven gas.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、コークス炉ガスの冷却
により析出したナフタリンをタールにより吸収除法する
方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for absorbing and removing naphthalene deposited by cooling coke oven gas with tar.

【0002】[0002]

【従来の技術】コークス炉で発生したコークス炉ガスは
図3で示すように、一次冷却工程(プライマリークラ
ー)10、硫化水素及びアンモニアを順次除去する工程
を有するガス精製工程11、最終冷却工程(ファイナル
クラー)12、軽油回収工程13を順次介して処理され
ている(この処理工程におけるコークス炉ガスの温度と
ナフタリン濃度を図4に示す)。
2. Description of the Related Art As shown in FIG. 3, a coke oven gas generated in a coke oven has a primary cooling step (primary Clark) 10, a gas refining step 11 having a step of sequentially removing hydrogen sulfide and ammonia, and a final cooling step ( A final clarifier) 12 and a light oil recovery step 13 are sequentially processed (the temperature of the coke oven gas and the naphthalene concentration in this processing step are shown in FIG. 4).

【0003】このコークス炉COで発生したコークス炉
ガス中は図4でわかるように15〜20g/Nm3 のナ
フタリンを含有していることから、このガスを一次冷却
工程10、最終冷却工程12で冷却するとナフタリンが
析出し、冷却設備の内部に付着する。この結果、ガスの
冷却処理能力の低下、熱交換器の閉塞による熱効率低下
などの悪影響を引き起こす。
Since the coke oven gas generated in the coke oven CO contains 15 to 20 g / Nm 3 of naphthalene as shown in FIG. 4, this gas is used in the primary cooling step 10 and the final cooling step 12. When cooled, naphthalene precipitates and adheres to the inside of the cooling equipment. As a result, there are adverse effects such as a decrease in gas cooling processing capacity and a decrease in thermal efficiency due to blockage of the heat exchanger.

【0004】このため、ガス冷却の際にガス中のナフタ
リンを除去してナフタリントラブルを防止する対策とし
て、例えば、特開昭52−48121号公報の提案があ
る。
Therefore, as a measure for preventing naphthalene trouble by removing naphthalene in the gas at the time of cooling the gas, for example, there is a proposal in Japanese Unexamined Patent Publication No. 52-48121.

【0005】これは、コークス炉COを出た高温ガスを
前記一次冷却工程10の直後に設けた無充填式冷却塔に
導入し、該塔からスプレーする冷却媒体に塔直近でター
ルを添加し、冷却により析出したナフタリンをタールで
吸収除去してナフタリンに起因する前記トラブルの防止
を図るものである。
This is because the high temperature gas discharged from the coke oven CO is introduced into an unfilled cooling tower provided immediately after the primary cooling step 10 and tar is added to the cooling medium sprayed from the tower in the immediate vicinity of the tower, The naphthalene deposited by cooling is absorbed and removed by tar to prevent the above troubles caused by naphthalene.

【0006】[0006]

【発明が解決しようとする課題】前記特開昭52−48
121号公報の提案のように、コークス炉ガスの高温域
においては散水した後の冷却塔底部に溜まった冷却媒体
の温度が比較的高い事から、タールが冷却媒体内に分散
し易く、しかも、高温域においてはタール自体のナフタ
リン吸収効率が良いことから、冷却塔の直近で冷却媒体
に単にタールを添加しても比較的良好にナフタリンを吸
収出来る。
DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
As proposed in Japanese Patent No. 121, since the temperature of the cooling medium collected at the bottom of the cooling tower after water sprinkling is relatively high in the high temperature region of the coke oven gas, tar is easily dispersed in the cooling medium, and In the high temperature range, since the tar itself has a high naphthalene absorption efficiency, naphthalene can be absorbed relatively well even if tar is simply added to the cooling medium in the immediate vicinity of the cooling tower.

【0007】しかしながら、前記最終冷却工程12のよ
うにコークス炉ガスの低温域においては前記高温域とは
反対に、冷却塔底部に溜まった冷却媒体の温度が低い事
から、タールが冷却媒体内に分散し難く、しかも、ター
ル自体のナフタリン吸収効率が悪い事から、前記特開昭
52−48121号公報の提案のように冷却塔の直近で
冷却媒体に単にタールを添加しても、タールが冷却媒体
中に分散せずに粗大化した状態で冷却媒体中に存在し
て、タールの表面積が小さくなり、しかも、最終冷却工
程12においてはコークス炉ガスのナフタリン濃度も一
次冷却工程10に比して低いことも相まって図2中のA
に示すようにタールのナフタリン吸収効率は低いもので
ある。
However, in the low temperature region of the coke oven gas as in the final cooling step 12, as opposed to the high temperature region, since the temperature of the cooling medium accumulated at the bottom of the cooling tower is low, tar is contained in the cooling medium. Since it is difficult to disperse and the naphthalene absorption efficiency of the tar itself is poor, even if tar is simply added to the cooling medium in the immediate vicinity of the cooling tower as in the proposal of the above-mentioned JP-A-52-48121, the tar is cooled. It is present in the cooling medium in a coarse state without being dispersed in the medium, and the surface area of the tar is reduced. Moreover, in the final cooling step 12, the naphthalene concentration of the coke oven gas is smaller than that in the primary cooling step 10. Combined with the low value, A in Fig. 2
As shown in, tar has a low naphthalene absorption efficiency.

【0008】このため、多量のタールを冷却媒体を添加
しなければならず、多量のタールの微粒子がコークス炉
ガスに伴って後工程の軽油回収工程13に流入する。こ
れにより、軽油回収工程で使用している吸収油中へター
ルが一部が混入し、吸収油の劣化や性状変化による軽油
回収効率の低下、コークス炉ガス使用先での小径配管へ
タール付着による閉塞等の問題を有するものであった。
For this reason, a large amount of tar must be added to the cooling medium, and a large amount of tar fine particles flow into the light oil recovery step 13 in the subsequent step along with the coke oven gas. As a result, some of the tar is mixed into the absorbing oil used in the light oil recovery process, which reduces the efficiency of light oil recovery due to deterioration of the absorbing oil and changes in its properties, and tar adheres to the small-diameter pipe at the coke oven gas destination. It had a problem such as blockage.

【0009】本発明は、コークス炉ガスの最終冷却工程
の操業条件を変更することなくタールのナフタリン吸収
効率を向上して該最終冷却工程でのタールの冷却媒体中
への添加量を低減することを課題とするものである。
According to the present invention, the naphthalene absorption efficiency of tar is improved and the amount of tar added to the cooling medium in the final cooling step is reduced without changing the operating conditions of the final cooling step of the coke oven gas. Is an issue.

【0010】[0010]

【課題を解決しようとする手段】本発明は上記課題を解
決するためになされたものであり、その特徴とする手段
は、硫化水素、アンモニアを除去したコークス炉ガスに
冷却媒体を散布してコークス炉ガスを直接冷却した後、
コークス炉ガス中の軽油を除去するに際して、前記コー
クス炉ガスの冷却を、前記冷却媒体にタールを添加して
撹拌器で撹拌混合し、コークス炉ガス中に散布して行う
ことによりコークス炉ガスの冷却で析出したナフタリン
を吸収除去するものである。
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its characteristic means is to coke the coke oven gas from which hydrogen sulfide and ammonia have been removed with a cooling medium. After directly cooling the furnace gas,
When removing the light oil in the coke oven gas, the coke oven gas is cooled by adding tar to the cooling medium, stirring and mixing with a stirrer, and spraying the coke oven gas into the coke oven gas. It absorbs and removes naphthalene deposited by cooling.

【0011】尚、前記冷却媒体とタールを撹拌混合する
撹拌器としては、図1中、点線に示すように機械的に撹
拌する撹拌器20を冷却媒体の供給経路6に介設しても
よいが、該冷却媒体供給経路6にポンプを設置している
場合には、該ポンプに撹拌機能があれば、ポンプを代用
する事が設備的に安価となり好ましい。
As a stirrer for stirring and mixing the cooling medium and tar, a stirrer 20 for mechanically stirring as shown by a dotted line in FIG. 1 may be provided in the cooling medium supply path 6. However, when a pump is installed in the cooling medium supply path 6, if the pump has a stirring function, it is preferable to substitute the pump because it is cheap in terms of equipment.

【0012】[0012]

【作用】本発明は冷却媒体にタールを添加して撹拌する
ことにより該タールが細粒化して球状化し、これをその
まま圧送して冷却塔から散布することにより、該タール
のトータル表面積が大きくなり、下方から上昇してくる
ガスと微粒子化したタールを冷却媒体と一緒に上部から
スプレーする事でナフタリンとの接触機会が多く成っ
て、図2中、Bに示すようにA(従来例)に比して析出
したナフタリンを効率良く吸収除去するものである。
In the present invention, the tar is added to the cooling medium and stirred to make the tar finer and spherical, and the tar is directly fed and sprayed from the cooling tower to increase the total surface area of the tar. By spraying the gas rising from below and the finely divided tar together with the cooling medium from above, there are many opportunities for contact with naphthalene, and as shown by B in FIG. 2, it becomes A (conventional example). In comparison, the deposited naphthalene is efficiently absorbed and removed.

【0013】[0013]

【実施例】本発明の一実施例を図1を参照して説明す
る。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.

【0014】図中、1は最終冷却塔であり、下部のガス
導入口2より導入して、上部のガス排出口3より排出し
ている。4は最終冷却塔1内を上昇して来るコークス炉
ガス冷却する冷却媒体としての循環冷却水を散水する散
水ノズル、5は最終冷却塔1の底部に溜まった冷却水を
前記散水ノズル4に冷却水供給管6及び冷却器7を介し
て循環する循環ポンプ、8は最終冷却塔1の底部に沈降
分離したタールと冷却水の一部を冷却水排出管9を介し
て系外に排出する排水ポンプ、10はタールデカンター
(図示せず)から抽出したタール(ナフタリンを10.
0wt%を含有)を循環ポンプ5の入側の冷却水供給管
6に供給するタール供給管である。
In the figure, reference numeral 1 is a final cooling tower, which is introduced through a lower gas inlet 2 and discharged through an upper gas outlet 3. 4 is a spray nozzle for spraying circulating cooling water as a cooling medium for cooling the coke oven gas rising in the final cooling tower 1, and 5 is cooling water for cooling the cooling water accumulated at the bottom of the final cooling tower 1 to the spray nozzle 4. A circulation pump that circulates through the water supply pipe 6 and the cooler 7, and 8 is a drainage that discharges tar and a part of the cooling water settled at the bottom of the final cooling tower 1 to the outside of the system through a cooling water discharge pipe 9. The pump 10 is tar (naphthalene 10.3) extracted from a tar decanter (not shown).
It is a tar supply pipe for supplying (containing 0 wt%) to the cooling water supply pipe 6 on the inlet side of the circulation pump 5.

【0015】かくして、最終冷却塔1のガス導入口2よ
り温度45℃で、ナフタリン濃度1.5g/Nm3 のコ
ークス炉ガスを120万Nm3 /Hで導入すると共に循
環ポンプ5、冷却器7を介して散水ノズル4から温度:
24℃の循環冷却水を700Nm3 /Hで散水した。こ
の際、タールの添加量は少なくとも下記1式で求めた量
を添加すればよいが、本例ではηを95%として計算す
ると共に、安全率を5%見込んで1300リットル/H
とした。
Thus, a coke oven gas having a naphthalene concentration of 1.5 g / Nm 3 was introduced from the gas inlet 2 of the final cooling tower 1 at a temperature of 45 ° C. at a rate of 1.2 million Nm 3 / H, and a circulation pump 5 and a cooler 7 were used. Temperature from the watering nozzle 4 via:
The circulating cooling water at 24 ° C. was sprinkled at 700 Nm 3 / H. At this time, the amount of tar to be added may be at least the amount calculated by the following formula 1, but in this example, η is calculated as 95%, and a safety factor of 5% is expected to be 1300 liters / H.
And

【0016】 TH={G×(Ni−No)}÷{(Bi−Bo)×η} (1) 但しTH:タール添加量、G:導入ガス量、Ni:冷却
塔に導入するガス中のナフタリン濃度、No:冷却塔か
ら排出するガス中のナフタリン濃度、Bi:タールのナ
フタリン飽和単位重量、Bo:添加するタールが含有す
るナフタリン単位重量、η:タールのナフタリン吸収率 この結果、最終冷却塔1のガス排出口3より排出するコ
ークス炉ガスの温度は25℃まで冷却する事が出来、し
かも、ガス中のナフタリン濃度を0.9g/Nm3 吸収
除去し、0.6g/Nm3 にすることが出来た。
TH = {G × (Ni-No)} ÷ {(Bi-Bo) × η} (1) where TH: tar addition amount, G: introduced gas amount, Ni: in the gas introduced into the cooling tower Naphthalene concentration, No: Naphthalene concentration in gas discharged from cooling tower, Bi: Naphthalene saturated unit weight of tar, Bo: Naphthalene unit weight of tar added, η: Naphthalene absorption rate of tar As a result, final cooling tower the temperature of coke oven gas discharged from the first gas discharge ports 3 can be cooled to 25 ° C., moreover, the naphthalene concentration in the gas to 0.9 g / Nm 3 absorption removal, to 0.6 g / Nm 3 I was able to do it.

【0017】更に、冷却器7に付着するナフタリンをタ
ールで吸収除去する事が可能となり、該冷却器7の冷却
効率が向上すると共に付着ナフタリンの除去作業が不要
となった。
Furthermore, it is possible to absorb and remove naphthalene adhering to the cooler 7 with tar, which improves the cooling efficiency of the cooler 7 and eliminates the work of removing adhering naphthalene.

【0018】[0018]

【発明の効果】以上説明したように本発明は従来に比し
て大幅にタールの添加量を低減することが可能となり、
例えば、軽油回収工程の前段の最終冷却塔に適用した場
合には、軽油回収工程の吸収油へのタール混入が殆どな
くなって、軽油回収効率の低下を防止することが出来、
更に、コークス炉ガスの使用先でのタールによるトラブ
ルを防止することが出来る等の多大の効果を奏するもの
である。
As described above, according to the present invention, the amount of tar added can be significantly reduced as compared with the conventional one.
For example, when it is applied to the final cooling tower in the preceding stage of the light oil recovery process, tar is hardly mixed with the absorbing oil in the light oil recovery process, and it is possible to prevent a decrease in light oil recovery efficiency.
Further, it has a great effect that troubles due to tar at the place where the coke oven gas is used can be prevented.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施態様例を示す簡略側面図。FIG. 1 is a simplified side view showing an embodiment of the present invention.

【図2】本発明と従来例の冷却媒体中に添加するタール
量と処理後のナフタリン濃度との関係を示す図。
FIG. 2 is a diagram showing the relationship between the amount of tar added to the cooling medium of the present invention and a conventional example and the concentration of naphthalene after treatment.

【図3】コークス炉ガスの処理工程を示す簡略図。FIG. 3 is a simplified diagram showing a treatment process of coke oven gas.

【図4】コークス炉ガスの各処理工程におけるコークス
炉ガス温度とナフタリン濃度を示す図。
FIG. 4 is a diagram showing coke oven gas temperature and naphthalene concentration in each coke oven gas treatment step.

【符号の説明】[Explanation of symbols]

1…最終冷却塔 2…下部ガス導入
口 3…上部ガス排出口 4…散水ノズル 5…循環ポンプ 6…冷却水供給管 7…冷却器 8…排水ポンプ 9…冷却水排出管 10…タール供給
管 20…撹拌器
DESCRIPTION OF SYMBOLS 1 ... Final cooling tower 2 ... Lower gas inlet 3 ... Upper gas outlet 4 ... Sprinkling nozzle 5 ... Circulation pump 6 ... Cooling water supply pipe 7 ... Cooler 8 ... Drainage pump 9 ... Cooling water discharge pipe 10 ... Tar supply pipe 20 ... Stirrer

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 硫化水素、アンモニアを除去したコーク
ス炉ガスに冷却媒体を散布してコークス炉ガスを直接冷
却した後、コークス炉ガス中の軽油を除去するに際し
て、前記コークス炉ガスの冷却を、前記冷却媒体にター
ルを添加して撹拌器で撹拌混合し、コークス炉ガス中に
散布して行うことを特徴とするコークス炉ガスの冷却で
析出したナフタリンの除去方法。
1. A coke oven gas from which hydrogen sulfide and ammonia have been removed is sprayed with a cooling medium to directly cool the coke oven gas, and when the light oil in the coke oven gas is removed, the coke oven gas is cooled. A method for removing naphthalene deposited by cooling coke oven gas, comprising adding tar to the cooling medium, stirring and mixing with a stirrer, and spraying the mixture into coke oven gas.
JP7344894A 1994-04-12 1994-04-12 Removal of naphthalene deposited by cooling of coke oven gas Withdrawn JPH07278553A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7344894A JPH07278553A (en) 1994-04-12 1994-04-12 Removal of naphthalene deposited by cooling of coke oven gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7344894A JPH07278553A (en) 1994-04-12 1994-04-12 Removal of naphthalene deposited by cooling of coke oven gas

Publications (1)

Publication Number Publication Date
JPH07278553A true JPH07278553A (en) 1995-10-24

Family

ID=13518524

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7344894A Withdrawn JPH07278553A (en) 1994-04-12 1994-04-12 Removal of naphthalene deposited by cooling of coke oven gas

Country Status (1)

Country Link
JP (1) JPH07278553A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010103379A (en) * 2000-05-10 2001-11-23 이구택 A apparatus for removing impurity in cog pipe automatically
KR100405511B1 (en) * 1998-12-18 2004-03-19 주식회사 포스코 Naphthalene removal device in coke gas
KR100503349B1 (en) * 2000-12-22 2005-07-26 재단법인 포항산업과학연구원 Apparatus for removing Naphthalene from Coke oven use light oil and ethanol
KR100508999B1 (en) * 2000-12-02 2005-08-18 주식회사 포스코 Apparatus for segregating and resolving naphthalene in tar exhaust line
KR100514814B1 (en) * 2000-12-23 2005-09-14 주식회사 포스코 Method For Removing Naphthalene In Coke Gas
KR100852347B1 (en) * 2002-09-12 2008-08-14 주식회사 포스코 Apparatus for draining crude coal tar
JP2009057415A (en) * 2007-08-30 2009-03-19 Mitsubishi Chemicals Corp Refining method for gas
KR100906563B1 (en) * 2002-12-24 2009-07-07 재단법인 포항산업과학연구원 Method for absorption of hydrogen sulfide from coke oven gas
KR20150074312A (en) * 2013-12-23 2015-07-02 주식회사 포스코 Apparatus and solvent for clearance of Coke Oven Gas's primary cooler preventing material
TWI687509B (en) * 2019-01-25 2020-03-11 中國鋼鐵股份有限公司 Method for cooling coke oven gas and equipment thereof

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100405511B1 (en) * 1998-12-18 2004-03-19 주식회사 포스코 Naphthalene removal device in coke gas
KR20010103379A (en) * 2000-05-10 2001-11-23 이구택 A apparatus for removing impurity in cog pipe automatically
KR100508999B1 (en) * 2000-12-02 2005-08-18 주식회사 포스코 Apparatus for segregating and resolving naphthalene in tar exhaust line
KR100503349B1 (en) * 2000-12-22 2005-07-26 재단법인 포항산업과학연구원 Apparatus for removing Naphthalene from Coke oven use light oil and ethanol
KR100514814B1 (en) * 2000-12-23 2005-09-14 주식회사 포스코 Method For Removing Naphthalene In Coke Gas
KR100852347B1 (en) * 2002-09-12 2008-08-14 주식회사 포스코 Apparatus for draining crude coal tar
KR100906563B1 (en) * 2002-12-24 2009-07-07 재단법인 포항산업과학연구원 Method for absorption of hydrogen sulfide from coke oven gas
JP2009057415A (en) * 2007-08-30 2009-03-19 Mitsubishi Chemicals Corp Refining method for gas
KR20150074312A (en) * 2013-12-23 2015-07-02 주식회사 포스코 Apparatus and solvent for clearance of Coke Oven Gas's primary cooler preventing material
TWI687509B (en) * 2019-01-25 2020-03-11 中國鋼鐵股份有限公司 Method for cooling coke oven gas and equipment thereof

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