JPH11142072A - Vertical type heat exchanger - Google Patents
Vertical type heat exchangerInfo
- Publication number
- JPH11142072A JPH11142072A JP30533097A JP30533097A JPH11142072A JP H11142072 A JPH11142072 A JP H11142072A JP 30533097 A JP30533097 A JP 30533097A JP 30533097 A JP30533097 A JP 30533097A JP H11142072 A JPH11142072 A JP H11142072A
- Authority
- JP
- Japan
- Prior art keywords
- cooling water
- heat transfer
- inlet
- heat exchanger
- load
- 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
- Details Of Heat-Exchange And Heat-Transfer (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、熱負荷の変動に対
応が可能な堅型の熱交換器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rigid heat exchanger capable of coping with fluctuations in heat load.
【０００２】[0002]
【従来技術】熱交換器は様々な分野で用いられ、その一
つにポリオレフィンの気相重合装置が例示される。こう
した装置では、重合熱を除去するために循環ガスライン
に熱交換器が設けられ、製造施設内で循環使用される冷
却水でプロセス流体の冷却が行われるようにしてある。2. Description of the Related Art Heat exchangers are used in various fields, one example of which is a polyolefin gas phase polymerization apparatus. In such an apparatus, a heat exchanger is provided in a circulation gas line to remove heat of polymerization, and the process fluid is cooled by cooling water circulated and used in a manufacturing facility.
【０００３】[0003]
【発明が解決しようとする課題】製造施設では、冷却水
に安価な工業用水が使用されることが多い。こうした水
は無機塩類を含み、無機塩類は熱交換器内の伝熱管に次
第に析出堆積してスケールを形成し、伝熱効率を低下さ
せる。伝熱管に形成されるスケール層は冷却水温が上が
るにつれ増加する。In manufacturing facilities, inexpensive industrial water is often used for cooling water. Such water contains inorganic salts, and the inorganic salts gradually deposit and accumulate on the heat transfer tubes in the heat exchanger to form scales and reduce the heat transfer efficiency. The scale layer formed on the heat transfer tube increases as the cooling water temperature increases.
【０００４】熱交換器にはまた、伝熱管にステンレス材
が使用されることが多いが、こうした素材ではとくに塩
素イオン等を含む冷却水に６０℃以上の冷却水を使用す
ると、応力腐食割れを発生し易くなる。そこで熱交換器
は一般に、冷却水の出口温度が５０℃以下となるように
設計されているが、ポリオレフィン重合装置のように熱
負荷が大きく変動する装置に用いられる熱交換器の場
合、最大熱負荷に合わせて設計されているため、熱負荷
が低いと、冷却水量を下げざるを得なくなり、冷却水量
が下がると、冷却水温は最大、プロセス流体温度まで上
がるようになる。その結果、伝熱管に生成されるスケー
ル層が増加し、伝熱効率が低下すると共に、スケールが
付着した伝熱管は応力腐食割れが起き易い雰囲気に置か
れることゝなる。[0004] In a heat exchanger, a stainless steel material is often used for a heat transfer tube. In such a material, stress corrosion cracking can be caused particularly when cooling water of 60 ° C. or more is used for cooling water containing chlorine ions or the like. It is easy to occur. Therefore, the heat exchanger is generally designed so that the outlet temperature of the cooling water is 50 ° C. or lower. However, in the case of a heat exchanger used in a device having a large heat load such as a polyolefin polymerization device, the maximum heat Since it is designed for the load, when the heat load is low, the cooling water amount has to be reduced, and when the cooling water amount decreases, the cooling water temperature rises up to the process fluid temperature at the maximum. As a result, the scale layer generated in the heat transfer tube increases, the heat transfer efficiency decreases, and the heat transfer tube to which the scale adheres is placed in an atmosphere where stress corrosion cracking easily occurs.
【０００５】本発明の第１の目的は、熱負荷の変動に対
応して伝熱管の有効伝熱面積を変え、これにより冷却水
温の上昇を防ぐことができる堅型の熱交換器を提供しよ
うとするものであり、第２の目的は、温度が高い上部へ
のスケール付着及び応力腐食割れを防止することができ
る堅型の熱交換器を提供しようとするものである。更に
第３の目的は、冷却水中に含まれるガスが熱交換器の上
部に溜まるのを防止できる熱交換器を提供しようとする
ものである。A first object of the present invention is to provide a rigid heat exchanger capable of changing the effective heat transfer area of a heat transfer tube in response to a change in heat load, thereby preventing a rise in cooling water temperature. A second object is to provide a rigid heat exchanger that can prevent scale adhesion and stress corrosion cracking on an upper portion having a high temperature. Further, a third object is to provide a heat exchanger that can prevent gas contained in cooling water from accumulating in the upper part of the heat exchanger.
【０００６】[0006]
【課題の解決手段】第１の目的を達成するための発明
は、縦向きの胴体と、胴体内部に縦設され、被冷却流体
が通される多数の伝熱管と、胴体に設けられ、伝熱管に
通される被冷却流体の入口及び出口と、胴体下部に設け
られる冷却水の導入口と、胴体に上下方向に適当間隔で
設けられる複数の冷却水排出口と、各排出口にそれぞれ
設けられる止水弁とからなるもので、任意の排出口の止
水弁を開くと、導入口より導入された冷却水が任意の排
出口より排出され、止水弁を開いた箇所によって冷却水
と接触する伝熱管の有効伝熱面積が変えられる。A first aspect of the present invention is directed to a vertically oriented body, a plurality of heat transfer tubes vertically provided inside the body and through which a fluid to be cooled is passed, and provided in the body, An inlet and an outlet for a fluid to be cooled passed through the heat pipe, an inlet for cooling water provided at a lower portion of the body, a plurality of cooling water outlets provided at appropriate intervals in the body in a vertical direction, and provided at each outlet. When the water shutoff valve at an optional outlet is opened, the cooling water introduced from the inlet is discharged from the optional outlet, and the cooling water flows through the part where the water shutoff valve is opened. The effective heat transfer area of the contacting heat transfer tube is changed.
【０００７】第２の目的を達成するための発明は、第１
の目的を達成するための上記発明において、胴体上部に
無機塩類を含まない水の導入口を設け、該導入口から無
機塩類を含まない水を導入することによって下部からの
冷却水の侵入を防ぎ、これにより温度が高い上部でのス
ケール付着及び応力腐食割れを防止しようとするもので
ある。The invention for achieving the second object is the first invention.
In the above invention for achieving the above object, an inlet for water containing no inorganic salts is provided at the upper part of the fuselage, and the water containing no inorganic salts is introduced from the inlet to prevent cooling water from entering from below. This is intended to prevent scale adhesion and stress corrosion cracking on the upper part where the temperature is high.
【０００８】第３の目的を達成するための発明は、上記
第１或いは第２の目的を達成するための発明において、
胴体上部にガス抜き口を設け、胴体上部に溜まるガスを
排出できるようにしたものである。上記各発明の代表的
な用途としては、ポリオレフィンの気相重合装置におい
て、重合熱を除去するための用途が挙げられるが、上記
各発明は、この用途に限定されたものではなく、他の用
途に使用可能である。したがって上記各発明における被
冷却流体は、気体、液体、粉粒体或いはこれらの混合流
体のいづれであってもよい。[0008] The invention for achieving the third object is the invention for achieving the first or second object.
A gas vent is provided in the upper part of the body so that gas accumulated in the upper part of the body can be discharged. A typical use of each of the above-mentioned inventions is a use for removing heat of polymerization in a gas-phase polymerization apparatus for polyolefin, but each of the above-mentioned inventions is not limited to this use. It can be used for Therefore, the fluid to be cooled in each of the above inventions may be any of a gas, a liquid, a granular material, or a mixed fluid thereof.
【０００９】[0009]
【発明の実施の形態】図１は、気相重合装置１を含む循
環ガスライン２に熱交換器３を設けた例を示すもので、
熱交換器３で冷却されたオレフィン含有ガスがポンプ４
によって気相重合装置１に下部より供給され、別に供給
された触媒と共に流動しつゝ気相重合を行い、重合熱に
より温度上昇した未反応ガスが熱交換器３に送られるよ
うになっている。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example in which a heat exchanger 3 is provided in a circulating gas line 2 including a gas phase polymerization apparatus 1.
The olefin-containing gas cooled in the heat exchanger 3 is supplied to the pump 4
The gas is supplied from below to the gas phase polymerization apparatus 1 and flows together with a separately supplied catalyst to perform gas phase polymerization, and the unreacted gas whose temperature is increased by polymerization heat is sent to the heat exchanger 3. .
【００１０】図２は、熱交換器３の詳細を示すもので、
上端と下端にオレフィン含有ガスの入口１１と出口１２
を有する縦向きの胴体１３と、上下端を管板１４及び１
５にそれぞれ固着支持されて胴体内部に縦向きに並設さ
れ、オレフィン含有ガスが通される多数の伝熱管１６
と、胴体下部に設けられる冷却水の導入口１７と、胴体
上部に設けられるボイラー水、イオン交換水等の無機塩
類を含有しない水の導入口１８と、導入口１７と導入口
１８との間において上下方向に一定間隔で胴体１３に設
けられる冷却水排出口１９ａ、１９ｂ、・・・１９ｚ
と、最上部の冷却水排出口１９ｚ上に設けられるガス抜
き口２１と、各冷却水排出口１９ａ、１９ｂ、・・・１
９ｚにそれぞれ設けられる止水弁としての電磁弁２２
ａ、２２ｂ、・・２２ｚと、ガス抜き口２１に設けられ
る電磁弁２３とよりなっており、これら各電磁弁２２
ａ、２２ｂ、・・２２ｚ及び２３は図示省略したコンピ
ュータよりなる制御装置によって制御されるようにして
ある。図中、２５は邪魔板である。FIG. 2 shows details of the heat exchanger 3.
Olefin-containing gas inlet 11 and outlet 12 at upper and lower ends
A vertical body 13 having upper and lower ends with tube sheets 14 and 1
5, a plurality of heat transfer tubes 16 vertically arranged inside the body and through which an olefin-containing gas is passed.
Between the cooling water inlet 17 provided at the lower part of the fuselage, the inlet 18 containing no inorganic salts such as boiler water and ion-exchanged water provided at the upper part of the fuselage, and between the inlet 17 and the inlet 18 , 19z, cooling water outlets 19a, 19b,.
, A gas vent 21 provided on the uppermost cooling water outlet 19z, and respective cooling water outlets 19a, 19b,.
Solenoid valve 22 as a water shutoff valve provided in each of 9z
a, 22b,... 22z and a solenoid valve 23 provided in the gas vent 21.
a, 22b,..., 22z and 23 are controlled by a control device including a computer (not shown). In the figure, 25 is a baffle plate.
【００１１】本発明によると、気相重合装置での熱負荷
が最大であるときには、これを検出したセンサー（図示
省略）からの出力信号により制御装置が最上部の電磁弁
２２ｚに制御信号を出力し、該電磁弁２２ｚのみを開
く。これにより導入口１７より供給された冷却水が胴体
上部に達し、排出口１９ｚより排出される。熱負荷が低
下すると、その熱負荷に対応する例えば電磁弁２２ｎが
開き、冷却水の排出が排出口１９ｎより行われる。これ
により伝熱管１６の冷却水による有効伝熱面積が減少
し、冷却水温の上昇が必要以上に上がるのが防止され
る。熱負荷が最小になったときは、冷却水は排出口１９
ａより排出される。According to the present invention, when the heat load in the gas phase polymerization apparatus is at a maximum, the control device outputs a control signal to the uppermost electromagnetic valve 22z in accordance with an output signal from a sensor (not shown) which has detected the heat load. Then, only the solenoid valve 22z is opened. Thereby, the cooling water supplied from the inlet 17 reaches the upper part of the body and is discharged from the outlet 19z. When the thermal load decreases, for example, the electromagnetic valve 22n corresponding to the thermal load opens, and the cooling water is discharged from the discharge port 19n. As a result, the effective heat transfer area of the heat transfer tube 16 due to the cooling water is reduced, and the temperature of the cooling water is prevented from rising more than necessary. When the heat load is at a minimum, the cooling water
It is discharged from a.
【００１２】冷却水供給中は常時、下部からの冷却水の
侵入を防ぎ、かつ温度が高い上部へのスケール付着及び
応力腐食割れを防ぐため、導入口１８より無機塩類を含
まない水が供給される。また冷却水及び無機塩類を含ま
ない水に含まれるガスが浮上して胴体上部の管板１４下
に溜まるのを防ぐため常時電磁弁２３が開けられ、ガス
が導入口１８より供給された水の一部と共に排出され
る。この無機塩類を含まない水は、導入口１７から導入
される冷却水に対して１〜１０％であることが好まし
い。また、この無機塩類を含まない水の供給温度は、導
入口１７から導入される冷却水の温度と出口１２のガス
温度の間にあるのが好ましく、ガス温度に近い方がスケ
ーリング防止効果が向上して好ましい。During the supply of cooling water, water containing no inorganic salts is supplied from the inlet 18 in order to prevent the intrusion of the cooling water from the lower part and to prevent scale adhesion and stress corrosion cracking to the upper part where the temperature is high. You. In order to prevent the gas contained in the cooling water and water containing no inorganic salts from floating and accumulating under the tube plate 14 at the upper part of the fuselage, the solenoid valve 23 is always opened, and the gas supplied from the inlet 18 is Exhausted with some. The water containing no inorganic salts is preferably 1 to 10% of the cooling water introduced from the inlet 17. Further, the supply temperature of the water not containing the inorganic salts is preferably between the temperature of the cooling water introduced from the inlet 17 and the gas temperature of the outlet 12, and the closer to the gas temperature, the higher the scaling prevention effect. Is preferred.
【００１３】[0013]
【発明の効果】請求項１記載の発明によると、排出口を
選択することにより熱負荷の変動に対応して伝熱管の有
効伝熱面積を変えることができ、熱負荷が小さくなった
ときには、冷却水量を下げないで伝熱管の有効伝熱面積
を小さくすることにより対処できるため、従来のように
冷却水の水量を下げるのと比べ、熱交換器上部での冷却
水の水温の上昇を防ぐことができ、スケール層の増加に
よる伝熱効率の低下及び伝熱管の応力腐食割れを防ぐこ
とができる。According to the first aspect of the present invention, the effective heat transfer area of the heat transfer tube can be changed according to the change in the heat load by selecting the discharge port. This can be dealt with by reducing the effective heat transfer area of the heat transfer tubes without reducing the amount of cooling water, thus preventing a rise in the temperature of the cooling water at the top of the heat exchanger, compared to reducing the amount of cooling water as before. It is possible to prevent a decrease in heat transfer efficiency due to an increase in the scale layer and a stress corrosion crack of the heat transfer tube.
【００１４】請求項２記載の発明によると、上部から無
機塩類を含まない水を導入して下部からの冷却水の侵入
を防ぐことにより温度が高い上部でのスケール付着及び
応力腐食割れを防ぐことができる。請求項３記載の発明
によると、上部に溜まったガスが逐次排出されるように
なる。According to the second aspect of the present invention, water containing no inorganic salts is introduced from the upper portion to prevent cooling water from entering from the lower portion, thereby preventing scale adhesion and stress corrosion cracking in the upper portion having a high temperature. Can be. According to the third aspect of the invention, the gas accumulated in the upper portion is sequentially discharged.
【図１】気相重合装置を含む循環ガスラインを示す図。FIG. 1 is a diagram showing a circulating gas line including a gas phase polymerization apparatus.
【図２】本発明に係わる熱交換器の断面図。FIG. 2 is a sectional view of the heat exchanger according to the present invention.
１・・気相重合装置 ２・・循環ガスライン ３・・熱交換器 ４・・ポンプ １１・・入口 １２・・出口 １３・・胴体 １４、１５・・管板 １６・・伝熱管 １７、１８・・導入口 １９ａ、１９ｂ・・・１９ｚ・・冷却水排出口 ２１・・ガス抜き口 ２２ａ、２２ｂ・・・２２ｚ、２３・・電磁弁 ２５・・邪魔板 1. Gas-phase polymerization apparatus 2. Circulating gas line 3. Heat exchanger 4. Pump 11. Inlet 12. Outlet 13. Body 14, 15 ... Tube plate 16. Heat transfer tubes 17, 18 ··· Inlet 19a, 19b ··· 19z ··· Cooling water discharge 21 ··· Gas vent 22a, 22b ··· 22z and 23 ··· Solenoid valve 25 ···
Claims (3)
冷却流体が通される多数の伝熱管と、胴体に設けられ、
伝熱管に通される被冷却流体の入口及び出口と、胴体下
部に設けられる冷却水の導入口と、胴体に上下方向に適
当間隔で設けられる複数の冷却水排出口と、各排出口に
それぞれ設けられる止水弁とからなる堅型の熱交換器。1. A vertically oriented body, a plurality of heat transfer tubes vertically provided inside the body and through which a fluid to be cooled is passed, and provided on the body.
The inlet and outlet of the fluid to be cooled passed through the heat transfer tube, the inlet of cooling water provided at the lower part of the body, a plurality of cooling water outlets provided at appropriate intervals in the body in the vertical direction, and each of the outlets A rigid heat exchanger consisting of a water stop valve provided.
を設け、該導入口から無機塩類を含まない水を導入する
ことによって下部からの冷却水の侵入を防ぐ請求項１記
載の堅型の熱交換器。2. An inflatable body according to claim 1, wherein an inlet for water containing no inorganic salts is provided at an upper portion of the body, and water that does not contain inorganic salts is introduced from the inlet to prevent cooling water from entering from below. Mold heat exchanger.
溜まるガスを排出できるようにした請求項１又は２のい
づれかの請求項に記載の堅型の熱交換器。3. The rigid heat exchanger according to claim 1, wherein a gas vent is provided in an upper portion of the body so that gas accumulated in the upper portion of the body can be discharged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30533097A JPH11142072A (en) | 1997-11-07 | 1997-11-07 | Vertical type heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30533097A JPH11142072A (en) | 1997-11-07 | 1997-11-07 | Vertical type heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11142072A true JPH11142072A (en) | 1999-05-28 |
Family
ID=17943825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30533097A Pending JPH11142072A (en) | 1997-11-07 | 1997-11-07 | Vertical type heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11142072A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002340487A (en) * | 2001-05-18 | 2002-11-27 | Noritake Co Ltd | Circulation type heat exchanging method and heat exchanger |
| JP2012503169A (en) * | 2008-09-23 | 2012-02-02 | アルストーム・テクノロジー・リミテッド | Multi-tube heat exchanger for controlling a wide performance range |
| CN104048529A (en) * | 2014-06-24 | 2014-09-17 | 中北大学 | Tubular heat exchanger with variable area |
| CN105466272A (en) * | 2015-12-15 | 2016-04-06 | 安徽晋煤中能化工股份有限公司 | Method for adjusting area of cooler |
-
1997
- 1997-11-07 JP JP30533097A patent/JPH11142072A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002340487A (en) * | 2001-05-18 | 2002-11-27 | Noritake Co Ltd | Circulation type heat exchanging method and heat exchanger |
| JP2012503169A (en) * | 2008-09-23 | 2012-02-02 | アルストーム・テクノロジー・リミテッド | Multi-tube heat exchanger for controlling a wide performance range |
| CN104048529A (en) * | 2014-06-24 | 2014-09-17 | 中北大学 | Tubular heat exchanger with variable area |
| CN104048529B (en) * | 2014-06-24 | 2016-01-06 | 中北大学 | The pipe heat exchanger of variable area |
| CN105466272A (en) * | 2015-12-15 | 2016-04-06 | 安徽晋煤中能化工股份有限公司 | Method for adjusting area of cooler |
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