JP5332971B2 - Method for improving heat transfer efficiency of steam dryer - Google Patents

Method for improving heat transfer efficiency of steam dryer Download PDF

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JP5332971B2
JP5332971B2 JP2009158964A JP2009158964A JP5332971B2 JP 5332971 B2 JP5332971 B2 JP 5332971B2 JP 2009158964 A JP2009158964 A JP 2009158964A JP 2009158964 A JP2009158964 A JP 2009158964A JP 5332971 B2 JP5332971 B2 JP 5332971B2
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water
drum
heat transfer
transfer efficiency
steam
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JP2011012921A (en
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隆敏 佐藤
幸祐 志村
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Kurita Water Industries Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
    • F26B13/18—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning heated or cooled, e.g. from inside, the material being dried on the outside surface by conduction
    • F26B13/183—Arrangements for heating, cooling, condensate removal

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  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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Description

本発明は、回転式のドラム内に水蒸気を供給し、ドラム外面と接触する被乾燥物を乾燥するようにした蒸気ドライヤの伝熱効率改善方法に関する。   The present invention relates to a method for improving the heat transfer efficiency of a steam dryer in which water vapor is supplied into a rotary drum to dry an object to be dried which comes into contact with the outer surface of the drum.

回転式のドラムを備えた蒸気ドライヤは抄紙設備等において広く用いられている。紙を生産する抄紙機（ペーパーマシン）は、一般に紙料流出部、脱水部、圧搾・搾水部、乾燥部、サイズ部（表面強度・耐水性を持たせる加工部）、光沢部、及び巻取り部から構成される。乾燥部では水分含有率５０％前後の湿紙をカンバスなどで保持して数十本の直径１．２〜１．８ｍの円筒形の乾燥機表面に接触させて水分を蒸発させて水分含有率５〜１０％程度まで乾燥させる。   Steam dryers equipped with rotary drums are widely used in papermaking facilities. A paper machine that produces paper is generally a paper outflow part, a dewatering part, a pressing / watering part, a drying part, a size part (a processing part that gives surface strength and water resistance), a glossy part, and a winding part. It consists of a take-up part. In the drying section, a wet paper having a moisture content of about 50% is held in a canvas and brought into contact with several tens of cylindrical dryer surfaces with a diameter of 1.2 to 1.8 m to evaporate the moisture content. Dry to about 5-10%.

また、ティッシュペーパー・トイレットペーパー・キッチンペーパー・紙おむつなどの家庭紙用原料紙や片艶包装紙などの製造では、圧搾・搾水部を出た湿紙を、ヤンキードライヤと称される直径３〜５．５ｍの円筒形で円周部外表面を鏡面仕上げした１本の乾燥機に張り付け、乾燥機内側を蒸気で加熱し、外側の湿紙に熱風を吹きつけて乾燥させる。   Moreover, in the manufacture of raw paper for household paper such as tissue paper, toilet paper, kitchen paper, and paper diapers, and glossy wrapping paper, wet paper that has come out of the squeezing and squeezing section is used for a diameter of 3 to 3 called a Yankee dryer. A 5.5m cylindrical shape is attached to a dryer having a mirror-finished outer peripheral surface, the inside of the dryer is heated with steam, and hot air is blown to the outside wet paper to dry it.

いずれの乾燥機も、乾燥内部の熱源として、圧力０．３〜１ＭＰａ程度の飽和蒸気を吹きこんでいる。乾燥機内部では、蒸気の伝熱面への接触・放熱の結果、凝縮水が発生するため、サイホン式やバケット式などの排水手段によって凝縮水を排出している（例えば特許文献１，２）。   All dryers blow in saturated steam having a pressure of about 0.3 to 1 MPa as a heat source inside the drying. Inside the dryer, condensed water is generated as a result of contact / radiation of heat to the heat transfer surface of the steam, so the condensed water is discharged by a drainage means such as siphon type or bucket type (for example, Patent Documents 1 and 2). .

特開平５−２２２６９２JP-A-5-222692 特開２０００−８２９０JP2000-8290

特許文献１，２の通り、蒸気ドライヤのドラム内で生じた凝縮水は、サイホン等によってドラム外へ排出されるのであるが、完全には排出されず、また常に凝縮水が発生するところから、ドラム内には凝縮水がある程度溜っている。この凝縮水は、ドラムの回転に伴って遠心力によってドラム内周面に押し付けられ、ドラム内周面を這い上がるようにリフトされ、ドラム内周面を水膜状に覆うようになる。   As Patent Documents 1 and 2, the condensed water generated in the drum of the steam dryer is discharged out of the drum by a siphon or the like, but it is not completely discharged, and the condensed water is always generated. There is a certain amount of condensed water in the drum. This condensed water is pressed against the drum inner peripheral surface by centrifugal force as the drum rotates, lifted to scoop up the drum inner peripheral surface, and covers the drum inner peripheral surface in the form of a water film.

このようにドラム内周面に水膜が存在すると、ドラム内に供給された水蒸気とドラム内周面との接触面積が減少し、また水膜が大きな熱抵抗となって伝熱効率が低下する。   When a water film is present on the drum inner peripheral surface as described above, the contact area between the water vapor supplied into the drum and the drum inner peripheral surface is reduced, and the water film becomes a large thermal resistance and the heat transfer efficiency is lowered.

本発明は、このような従来技術の問題点を解決し、蒸気ドライヤの伝熱効率を向上させることを目的とする。   An object of the present invention is to solve such problems of the prior art and improve the heat transfer efficiency of a steam dryer.

請求項１の蒸気ドライヤの伝熱効率改善方法は、蒸気ドライヤのドラム内に存在する水に、ドラム内周面と水との接触角を増大させる接触角増大剤を含有させることを特徴とするものである。   The method for improving the heat transfer efficiency of a steam dryer according to claim 1 is characterized in that the water present in the drum of the steam dryer contains a contact angle increasing agent that increases the contact angle between the drum inner peripheral surface and the water. It is.

請求項２の蒸気ドライヤの伝熱効率改善方法は、請求項１において、接触角増大剤が長鎖脂肪族アミンであることを特徴とするものである。   The method for improving the heat transfer efficiency of the steam dryer according to claim 2 is characterized in that, in claim 1, the contact angle increasing agent is a long-chain aliphatic amine.

請求項３の蒸気ドライヤの伝熱効率改善方法は、請求項２において、長鎖脂肪族アミンは、一般式ＣＨ３（ＣＨ２）ｍＮＨ２（ｍ＝９〜２３）で表わされる直鎖状長鎖脂肪族アミンであることを特徴とするものである。 The method for improving the heat transfer efficiency of a steam dryer according to claim 3 is the method according to claim 2, wherein the long-chain aliphatic amine is a linear length represented by the general formula CH 3 (CH 2 ) m NH 2 (m = 9 to 23). It is a chain aliphatic amine.

請求項４の蒸気ドライヤの伝熱効率改善方法は、請求項２又は３において、ドラムに導入される水蒸気又はこの水蒸気を発生させるボイラの給水に長鎖脂肪族アミンを添加することを特徴とするものである。   A method for improving heat transfer efficiency of a steam dryer according to claim 4 is characterized in that, in claim 2 or 3, a long-chain aliphatic amine is added to water vapor introduced into the drum or feed water of a boiler that generates this water vapor. It is.

本発明では、ドラム内の凝縮水に、ドラム内周面と水との接触角を増大させる接触角増大剤を含有させるので、水膜のリフトが抑制され、ドラム内周面と水蒸気との接触面積が大きくなり、伝熱効率が改善される。   In the present invention, since the condensed water in the drum contains a contact angle increasing agent that increases the contact angle between the drum inner peripheral surface and water, the water film lift is suppressed, and the drum inner peripheral surface contacts the water vapor. The area is increased and the heat transfer efficiency is improved.

また、水膜が形成され難く、形成された水膜の剥離も容易になることで、ドラムの回転速度を増大させてもドラム内周面と水蒸気との接触面積を確保できるところから、単位時間当りの乾燥量の増大例えば湿紙の生産性の向上も可能となる。   In addition, since it is difficult to form a water film and the peeling of the formed water film is facilitated, the contact area between the inner peripheral surface of the drum and water vapor can be secured even when the rotational speed of the drum is increased. It is also possible to increase the amount of dry per unit, for example, wet paper productivity.

この接触角増大剤としては、ＣＨ３（ＣＨ２）ｍＮＨ２（ｍ＝９〜２３）で表わされる直鎖状長鎖脂肪族アミンが好適である。この長鎖脂肪族アミン分子のアミノ基−ＮＨ２がドラム内周面を構成する金属材料に吸着する。この長鎖脂肪族アミンは、水分子と親和性の低い疎水基である炭素数１０〜２４の直鎖状アルキル基を有しているため、ドラム内周面に撥水性が付与され、ドラム内周面と水との接触角が増大する。 As the contact angle increasing agent, a linear long-chain aliphatic amine represented by CH 3 (CH 2 ) m NH 2 (m = 9 to 23) is preferable. The amino group —NH 2 of this long-chain aliphatic amine molecule is adsorbed to the metal material constituting the drum inner peripheral surface. Since this long-chain aliphatic amine has a linear alkyl group having 10 to 24 carbon atoms, which is a hydrophobic group having a low affinity for water molecules, water repellency is imparted to the inner peripheral surface of the drum. The contact angle between the peripheral surface and water increases.

湿紙乾燥設備の系統図である。It is a systematic diagram of wet paper drying equipment.

以下、本発明についてさらに詳細に説明する。   Hereinafter, the present invention will be described in more detail.

本発明は、蒸気ドライヤの回転式のドラム内の凝縮水に、ドラム内周面と水との接触角を増大させる接触角増大剤を含有させるようにしたものである。   In the present invention, the condensed water in the rotary drum of the steam dryer is made to contain a contact angle increasing agent that increases the contact angle between the inner peripheral surface of the drum and water.

接触角増大剤は、ドラムに供給される水蒸気に添加されてもよく、この水蒸気を発生させるボイラの給水に添加されてもよく、双方に添加されてもよい。ドラム内に直接に接触角増大剤を添加してもよいが、設備がやや複雑になると共に、接触角増大剤が凝縮水と均一に混合しない可能性もあるので、ボイラ給水又は水蒸気に添加するのが好ましい。   The contact angle increasing agent may be added to the steam supplied to the drum, may be added to the feed water of the boiler that generates this steam, or may be added to both. The contact angle enhancer may be added directly into the drum, but the equipment is somewhat complicated and the contact angle enhancer may not mix uniformly with the condensed water, so it is added to the boiler feed water or steam. Is preferred.

接触角増大剤は、この水蒸気又は給水に連続的に添加されてもよく、間欠的に添加されてもよい。また、蒸気ドライヤの運転開始時に所定時間継続して水蒸気又はボイラ給水に添加し、その後は間欠的に添加するようにしてもよい。蒸気ドライヤの運転開始時に接触角増大剤を多く添加し、その後は添加量を減少させるようにしてもよい。   The contact angle increasing agent may be added continuously or intermittently to the water vapor or feed water. Further, it may be continuously added for a predetermined time at the start of operation of the steam dryer and added to the steam or boiler feed water, and thereafter intermittently. A large amount of contact angle increasing agent may be added at the start of operation of the steam dryer, and thereafter the amount added may be decreased.

本発明で用いる接触角増大剤としては、長鎖脂肪族アミン特にＣＨ３（ＣＨ２）ｍＮＨ２（ｍ＝９〜２３）で表わされる直鎖状長鎖脂肪族アミンが好適である。なお、ｍが９よりも小さいと接触角増大作用が不足することがあり、ｍが２４よりも大きいとゲル化し易くなることがある。 The contact angle increasing agent used in the present invention is preferably a long-chain aliphatic amine, particularly a linear long-chain aliphatic amine represented by CH 3 (CH 2 ) m NH 2 (m = 9 to 23). When m is smaller than 9, the contact angle increasing action may be insufficient, and when m is larger than 24, gelation may be easily caused.

この長鎖脂肪族アミンをボイラ給水又は水蒸気に添加する場合、水蒸気中の長鎖脂肪族アミン濃度が０．０１〜３ｍｇ／ｋｇ−水蒸気、特に０．０５〜１ｍｇ／ｋｇ−水蒸気となるように添加するのが好ましい。   When this long-chain aliphatic amine is added to boiler feed water or steam, the long-chain aliphatic amine concentration in the steam is 0.01-3 mg / kg-steam, especially 0.05-1 mg / kg-steam. It is preferable to add.

長鎖脂肪族アミンの具体例としては、ドデシルアミン、トリデシルアミン、テトラデシルアミン、ペンタデシルアミン、ヘキサデシルアミン、ヘプタデシルアミン、オクタデシルアミン、ノナデシルアミン、エイコシルアミン、ドコシルアミンなどの飽和脂肪族アミン、オレイルアミン、リシノレイルアミン、リノレイルアミン、リノレニルアミンなどの不飽和脂肪族アミン、ヤシ油アミン、硬化牛脂アミンなどの混合アミン及びこれらの混合物を挙げられる。   Specific examples of long-chain aliphatic amines include saturated aliphatic amines such as dodecylamine, tridecylamine, tetradecylamine, pentadecylamine, hexadecylamine, heptadecylamine, octadecylamine, nonadecylamine, eicosylamine, and docosylamine. , Oleylamine, ricinoleylamine, linoleylamine, unsaturated aliphatic amines such as linoleylamine, mixed amines such as coconut oil amine, hydrogenated beef tallow amine and mixtures thereof.

長鎖脂肪族アミンは、メタノール、エタノール、イソプロパノール等の溶媒に溶解させて水蒸気又はボイラ給水に添加してもよいが、乳化剤を用いて水性エマルジョンとし、これを水蒸気又はボイラ給水に添加するのが好ましい。乳化剤としては、脂肪酸アルカリ金属塩、特に炭素数８〜２４とりわけ炭素数１０〜２２の飽和又は不飽和の脂肪酸アルカリ金属塩を好適に用いることができ、具体的には、カプリン酸、ラウリン酸、ミリスチン酸、パルミチン酸、ステアリン酸、アラキン酸、ベヘン酸、オレイン酸、エルカ酸、リノール酸、リノレン酸などの飽和又は不飽和の脂肪酸のナトリウム塩やカリウム塩が挙げられる。また、この脂肪酸アルカリ金属塩としては、食用油脂から製造される脂肪酸のナトリウム塩やカリウム塩も好ましく用いることができる。脂肪酸アルカリ金属塩としては、特に炭素数１４〜２２の不飽和脂肪酸、例えば、オレイン酸、エルカ酸、リノール酸、リノレン酸から選ばれる少なくとも1種を２５重量％以上含有する脂肪酸のアルカリ金属塩が好適である。   Long-chain aliphatic amines may be dissolved in a solvent such as methanol, ethanol, isopropanol and added to water vapor or boiler feed water. However, an emulsifier is used to form an aqueous emulsion, which is added to water vapor or boiler feed water. preferable. As the emulsifier, a fatty acid alkali metal salt, particularly a saturated or unsaturated fatty acid alkali metal salt having 8 to 24 carbon atoms, particularly 10 to 22 carbon atoms, can be preferably used. Specifically, capric acid, lauric acid, Examples include sodium salts and potassium salts of saturated or unsaturated fatty acids such as myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, oleic acid, erucic acid, linoleic acid, and linolenic acid. Moreover, as this fatty acid alkali metal salt, the sodium salt and potassium salt of the fatty acid manufactured from edible fats and oils can also be used preferably. Examples of the fatty acid alkali metal salt include an alkali metal salt of a fatty acid containing at least 25% by weight of at least one selected from unsaturated fatty acids having 14 to 22 carbon atoms, such as oleic acid, erucic acid, linoleic acid, and linolenic acid. Is preferred.

長鎖脂肪族アミンと脂肪酸アルカリ金属塩との配合割合は重量比（長鎖脂肪族アミン／脂肪酸アルカリ金属塩）で４０／１〜１／１特に２０／１〜２／１程度が好適である。その他、グリセリンと前述の脂肪酸とのエステルを好適に用いることができ、特にステアリン酸とのエステルを好ましく用いることができる。   The blending ratio of the long-chain aliphatic amine and the fatty acid alkali metal salt is preferably about 40/1 to 1/1, particularly about 20/1 to 2/1 in terms of weight ratio (long-chain aliphatic amine / fatty acid alkali metal salt). . In addition, an ester of glycerin and the aforementioned fatty acid can be suitably used, and an ester of stearic acid can be particularly preferably used.

蒸気ドライヤは各種産業設備のいずれに設置されたものであってもよい。蒸気ドライヤは、湿紙の乾燥工程に広く用いられているので、ヤンキードライヤを用いた湿紙乾燥設備に本発明方法を適用した場合の一例を第１図に示す。   The steam dryer may be installed in any of various industrial facilities. Since a steam dryer is widely used in a wet paper drying process, an example in which the method of the present invention is applied to a wet paper drying facility using a Yankee dryer is shown in FIG.

補給水装置１、給水槽２、配管３及び給水ヘッダ４を介してボイラ５へ給水が供給される。ボイラ５で発生した水蒸気は、水蒸気配管６、水蒸気ヘッダ７、配管８、流量調節バルブ９及び配管１０を介してヤンキードライヤのドラム１１内に供給される。   Water is supplied to the boiler 5 through the makeup water device 1, the water tank 2, the pipe 3 and the water header 4. Water vapor generated in the boiler 5 is supplied into a drum 11 of a Yankee dryer through a water vapor pipe 6, a water vapor header 7, a pipe 8, a flow rate adjusting valve 9 and a pipe 10.

このドラム１１は、第１図において時計方向に回転駆動されており、湿紙Ｐは、このドラム１１の外周面に接触して乾燥され、該外周面から剥離された後、製品巻取り工程へ送られる。乾燥された紙の含水率とドラム外周面の温度とがセンサによって測定され、これらに基づいて前記バルブ９によって水蒸気流量が調節される。   The drum 11 is driven to rotate in the clockwise direction in FIG. 1, and the wet paper P comes into contact with the outer peripheral surface of the drum 11 and is dried and peeled off from the outer peripheral surface. Sent. The moisture content of the dried paper and the temperature of the drum outer peripheral surface are measured by a sensor, and the water vapor flow rate is adjusted by the valve 9 based on these.

ドラム内で水蒸気が凝縮して生じた凝縮水Ｗは、サイホン管１２及び配管１３を介してフラッシュタンク１４へ送られ、濾過器１５を介して給水槽２へ返送される。   Condensed water W generated by the condensation of water vapor in the drum is sent to the flash tank 14 via the siphon pipe 12 and the pipe 13, and is returned to the water supply tank 2 via the filter 15.

ドラム１１の回転に伴う遠心力によって、凝縮水Ｗはドラム１１の内周面に押し付けられ、ドラム１１の回転方向にリフトされ、ドラム１１の内周面に水膜が形成される。   Due to the centrifugal force accompanying the rotation of the drum 11, the condensed water W is pressed against the inner peripheral surface of the drum 11 and lifted in the rotating direction of the drum 11, and a water film is formed on the inner peripheral surface of the drum 11.

この実施の形態では、ボイラ給水又は発生した水蒸気に対し前記接触角増大剤を添加する。この接触角増大剤の添加位置としては、給水に添加する場合は前記配管３が好適であり、水蒸気に添加する場合は水蒸気ヘッダ７が好適である。配管３にて給水に添加する場合は、給水槽２に添加する場合に比べて、ボイラ給水中の該増大剤の濃度を迅速に変更することができる。また、安定性が低い接触角増大剤の場合であっても、配管３で添加したときには添加後直ちにボイラ５に供給されるので、給水槽２に添加するときよりも好適である。ボイラ給水に添加された接触角増大剤は、水相から水蒸気相に移行し、水蒸気と共にドラム１１へ送られる。   In this embodiment, the contact angle increasing agent is added to boiler feed water or generated steam. As the addition position of the contact angle increasing agent, the pipe 3 is suitable when added to the feed water, and the steam header 7 is suitable when added to the steam. When added to the feed water through the pipe 3, the concentration of the increasing agent in the boiler feed water can be changed more quickly than when added to the feed water tank 2. Further, even in the case of a contact angle increasing agent having low stability, when it is added through the pipe 3, it is supplied to the boiler 5 immediately after the addition, which is more preferable than when it is added to the water supply tank 2. The contact angle increasing agent added to the boiler feed water moves from the water phase to the water vapor phase and is sent to the drum 11 together with the water vapor.

なお、ヤンキードライヤ以外の多筒式ドライヤなど各種の抄紙機ドライヤにも本発明を適用でき、抄紙機ドライヤ以外の蒸気ドライヤにも本発明を適用できる。   The present invention can be applied to various paper machine dryers such as a multi-cylinder dryer other than the Yankee dryer, and the present invention can also be applied to steam dryers other than the paper machine dryer.

以下、実施例及び比較例について説明する。   Hereinafter, examples and comparative examples will be described.

［実施例１］
第１図に示す抄紙乾燥設備において、ヤンキードライヤのドラム直径３ｍ、供給水蒸気圧力０．６ＭＰａ、水蒸気供給量約９００ｋｇ／ｈとし、ドラムの外表面温度が１００℃となり、乾燥後の製品（紙）の含水率が２０〜３０％となるように、ヤンキードライヤへの水蒸気供給量を流量調節弁９で制御した。 [Example 1]
In the papermaking drying equipment shown in FIG. 1, the drum diameter of the Yankee dryer is 3 m, the water vapor pressure is 0.6 MPa, the water vapor supply rate is about 900 kg / h, the outer surface temperature of the drum is 100 ° C., and the dried product (paper) The water supply amount to the Yankee dryer was controlled by the flow rate control valve 9 so that the water content of the water became 20-30%.

配管３から重油焚ボイラ給水に対しオクタデシルアミンを、給水中の濃度が０．２ｍｇ／Ｌとなるように添加した。なお、オクタデシルアミンは、オレイン酸ソーダで乳化させてボイラ給水に添加した。オレイン酸ソーダの配合量は、オクタデシルアミン１００重量部に対し１５重量部とした。水蒸気中のオクタデシルアミン濃度は０．２ｍｇ／ｋｇ−水蒸気であった。   Octadecylamine was added to the heavy oil fired boiler feed water from the pipe 3 so that the concentration in the feed water would be 0.2 mg / L. Octadecylamine was emulsified with sodium oleate and added to boiler feed water. The blending amount of sodium oleate was 15 parts by weight with respect to 100 parts by weight of octadecylamine. The octadecylamine concentration in the water vapor was 0.2 mg / kg-water vapor.

［実施例２］
実施例１において、オクタデシルアミンの給水への添加量を２．０ｍｇ／Ｌとしたこと以外は同様にして湿紙の乾燥を行った。 [Example 2]
In Example 1, the wet paper was dried in the same manner except that the amount of octadecylamine added to the feed water was 2.0 mg / L.

［実施例３］
オクタデシルアミンの代わりにドデシルアミンを給水への添加量が０．２ｍｇ／Ｌとなるように添加したこと以外は同様にして湿紙の乾燥を行った。 [Example 3]
The wet paper was dried in the same manner except that dodecylamine was added in place of octadecylamine so that the amount added to the feed water was 0.2 mg / L.

［比較例１］
オクタデシルアミンを添加しなかったこと以外は同様にして湿紙の乾燥を行った。 [Comparative Example 1]
The wet paper was dried in the same manner except that no octadecylamine was added.

［結果］
実施例１〜３と比較例１において、同時期に３０日間連続運転したときのボイラの重油消費量を比較したところ、比較例１を１００％とした場合、実施例１では９９．０％、実施例２では９８．０％、実施例３では９９．０％であり、実施例１〜３では重油消費量の低減効果が認められた。 [result]
In Examples 1 to 3 and Comparative Example 1, when the fuel oil consumption of the boiler when operated continuously for 30 days in the same period was compared, when Comparative Example 1 was set to 100%, in Example 1, 99.0%, In Example 2, it was 98.0%, and in Example 3, it was 99.0%. In Examples 1 to 3, the effect of reducing heavy oil consumption was recognized.

４ 給水ヘッダ
５ ボイラ
７ 水蒸気ヘッダ
１１ ドラム
１２ サイホン
Ｗ 凝縮水 4 Water supply header 5 Boiler 7 Water vapor header 11 Drum 12 Siphon W Condensed water

Claims (4)

蒸気ドライヤのドラム内に存在する水に、ドラム内周面と水との接触角を増大させる接触角増大剤を含有させることを特徴とする蒸気ドライヤの伝熱効率改善方法。   A method for improving the heat transfer efficiency of a steam dryer, characterized in that water existing in the drum of the steam dryer contains a contact angle increasing agent that increases the contact angle between the drum inner peripheral surface and water. 請求項１において、接触角増大剤が長鎖脂肪族アミンであることを特徴とする蒸気ドライヤの伝熱効率改善方法。   The method for improving the heat transfer efficiency of a steam dryer according to claim 1, wherein the contact angle increasing agent is a long-chain aliphatic amine. 請求項２において、長鎖脂肪族アミンは、一般式ＣＨ３（ＣＨ２）ｍＮＨ２（ｍ＝９〜２３）で表わされる直鎖状長鎖脂肪族アミンであることを特徴とする蒸気ドライヤの伝熱効率改善方法。 3. The steam dryer according to claim 2, wherein the long-chain aliphatic amine is a linear long-chain aliphatic amine represented by the general formula CH 3 (CH 2 ) m NH 2 (m = 9 to 23). To improve heat transfer efficiency. 請求項２又は３において、ドラムに導入される水蒸気又はこの水蒸気を発生させるボイラの給水に長鎖脂肪族アミンを添加することを特徴とする蒸気ドライヤの伝熱効率改善方法。   4. The method for improving the heat transfer efficiency of a steam dryer according to claim 2, wherein a long-chain aliphatic amine is added to the water vapor introduced into the drum or the feed water of a boiler that generates the water vapor.
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JP6965084B2 (en) * 2017-10-05 2021-11-10 株式会社前川製作所 Drying device and drying method
JP6601516B2 (en) * 2018-02-15 2019-11-06 栗田工業株式会社 Method for improving heating efficiency by steam and paper making method
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