JP4873308B2 - Pure steam production equipment - Google Patents

Pure steam production equipment Download PDF

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JP4873308B2
JP4873308B2 JP2006313999A JP2006313999A JP4873308B2 JP 4873308 B2 JP4873308 B2 JP 4873308B2 JP 2006313999 A JP2006313999 A JP 2006313999A JP 2006313999 A JP2006313999 A JP 2006313999A JP 4873308 B2 JP4873308 B2 JP 4873308B2
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誠一 丹
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Description

本発明は、医療機関、製薬及び食品製造等の分野で使用される高純度の蒸気製造装置に関するものである。   The present invention relates to a high-purity steam production apparatus used in fields such as medical institutions, pharmaceuticals, and food production.

この種の装置では、加熱器の機能を備えた加熱缶部と、蒸気を発生させる機能と気液分離機能とを備えた蒸発缶部とを備え、高純度蒸留水を加熱して蒸気を発生させ気液分離器により蒸気を取り出す仕組みを採用するものが一般的である。   This type of equipment has a heating can part that has the function of a heater, and an evaporator part that has a function for generating steam and a gas-liquid separation function, and generates steam by heating high-purity distilled water. In general, a system that uses a gas-liquid separator to extract steam is used.

従来、蒸気を発生させる部分は、加熱蒸気を缶内に充満させるようにした缶胴内に伝熱管を配置して伝熱管内に供給水（高純度蒸留水）を通過させ、伝熱管の周囲の熱源により過熱して蒸気を発生させている（例えば、特許文献１乃至３参照。）。   Conventionally, the steam generating part has been arranged around the heat transfer tube by arranging the heat transfer tube in the can body that is filled with the heated steam and allowing the supply water (high purity distilled water) to pass through the heat transfer tube. Is heated by a heat source to generate steam (see, for example, Patent Documents 1 to 3).

特開２０００−１６１６０２号公報（第５、第１２乃至１５段落、図１）Japanese Unexamined Patent Publication No. 2000-161602 (5th, 12th to 15th paragraphs, FIG. 1) 特開平６ー２８５０号公報（第１１、第１３段落、図１）JP-A-6-2850 (11th and 13th paragraphs, FIG. 1) 特開平１０ー２４６４０１号公報（第６、第１２段落、図２）JP-A-10-246401 (6th, 12th paragraph, FIG. 2)

しかし、従来の装置は、蒸気発生効率が低いため、十分な発生量を得るためには伝熱管の本数を多く加熱缶部を長大なものに構成する必要があった。   However, since the conventional apparatus has low steam generation efficiency, in order to obtain a sufficient generation amount, it is necessary to increase the number of heat transfer tubes and to make the heating can part long.

また、従来は缶体内に熱源としての加熱蒸気を充満させるため熱源の保有量が多く、そのため予熱に時間がかかり、反応速度が遅いという問題があつた。   Conventionally, the can body is filled with heated steam as a heat source, so the amount of the heat source is large, so that preheating takes time and the reaction rate is slow.

本発明は上記に鑑みてなされたものであり、その目的とするところは、従来よりもコンパクトで、伝熱管内の供給水（蒸気）の流速を上げることで蒸気発生効率の高い純粋蒸気製造装置を提供することにある。   The present invention has been made in view of the above, and an object of the present invention is to produce a pure steam that is more compact than the prior art and has high steam generation efficiency by increasing the flow rate of the feed water (steam) in the heat transfer tube. Is to provide.

上記の課題を解決するために、本発明に係る純粋蒸気製造装置は、加熱缶部と蒸発缶部とを備えた純粋蒸気製造装置であって、前記加熱缶部は、ストレート管で構成された複数本の一次伝熱管と、ストレート管で構成された１本又は複数本の二次伝熱管と、上部圧力室及び下部圧力室と、複数の電熱シーズヒータとを含み、前記一次伝熱管の一端はいずれも供給水を前記加熱缶部に取入れるための供給水取入口に接続されると共に前記下部圧力室に接続されており、前記一次伝熱管の他端はいずれも前記上部圧力室に接続されており、前記二次伝熱管の一端はいずれも前記上部圧力室に接続される一方でそれらの他端は前記下部圧力室を貫通して前記蒸発缶部に接続されており、前記複数の電熱シーズヒータは、いずれも前記一次伝熱管及び二次伝熱管のそれぞれに内装され前記伝熱管の管内壁と前記電熱シーズヒータ外面との間に狭い空隙が前記上部圧力室から前記下部圧力室まで上下に亘って設けられていると共に、その一端が前記上部圧力室を貫通して前記加熱缶部の上方に突出しその突出した上端部の夫々を各電源部への接続部となし、前記加熱缶部に取り入れた供給水を前記電熱シーズヒータにより加熱しながら前記空隙内を通過させて蒸気と液滴の混合状態にある気液２相流体を発生させ、前記伝熱管内で発生した蒸気の圧力により前記気液２相流体を前記伝熱管を通じて前記蒸発缶部に圧送するように構成され、前記二次伝熱管は前記加熱缶部の中心部に配置される一方、前記一次伝熱管は前記二次伝熱管の外側に配置されており、前記二次伝熱管は、前記一次伝熱管より少ない本数で構成されていることを特徴とする。 In order to solve the above-described problems, a pure steam production apparatus according to the present invention is a pure steam production apparatus including a heating can part and an evaporation can part, and the heating can part is configured by a straight pipe. One end of the primary heat transfer tube, including a plurality of primary heat transfer tubes, one or a plurality of secondary heat transfer tubes formed of straight tubes, an upper pressure chamber and a lower pressure chamber, and a plurality of electric heat sheathed heaters Are connected to a supply water inlet for taking supply water into the heating can part and connected to the lower pressure chamber, and the other end of the primary heat transfer tube is connected to the upper pressure chamber. One end of each of the secondary heat transfer tubes is connected to the upper pressure chamber, while the other end of the secondary heat transfer tube passes through the lower pressure chamber and is connected to the evaporator portion. All of the electric heat sheath heaters are the primary heat transfer tube and A narrow space is provided between the upper pressure chamber and the lower pressure chamber between the inner wall of each of the next heat transfer tubes and the inner wall of the heat transfer tube and the outer surface of the electric sheathed heater, and one end thereof is The upper pressure chamber penetrates through the upper can and protrudes upward from the heating can. Each protruding upper end serves as a connecting portion to each power source, and the water supplied to the heating can is heated by the electric sheathed heater. The gas-liquid two-phase fluid in a mixed state of steam and droplets is generated while passing through the gap, and the gas-liquid two-phase fluid is passed through the heat transfer tube by the pressure of the steam generated in the heat transfer tube. The secondary heat transfer tube is arranged at the central portion of the heating can portion, while the primary heat transfer tube is arranged outside the secondary heat transfer tube. The secondary heat transfer tube is the primary heat transfer Characterized in that it consists of fewer number.

上記の構成とすることにより従来は伝熱管内を通過する供給水を伝熱管の周囲の熱源により加熱していたために熱効率が悪かったのを伝熱管に内装した電熱シーズヒータによりダイレクトに且つ瞬時に加熱して蒸発させることにより伝熱管内の供給水（蒸気）の流速を上げることで蒸気発生効率を大巾に高めることができる。また、加熱缶の缶体内に熱源としての加熱蒸気を充満させる場合と比較して、予熱に要する時間が短縮される。 With the above configuration, the heat efficiency was poor because the supply water passing through the heat transfer tube was heated by the heat source around the heat transfer tube in the past, directly and instantaneously by the electric heat sheath heater built in the heat transfer tube. increasing the flow rate of feed water in the heat transfer tube (vapor) by evaporating heating and Ru can increase the steam generation efficiency by a large margin in. Moreover, the time required for preheating is shortened compared with the case where the heating steam as a heat source is filled in the can body of the heating can .

一次、二次伝熱管をこのような配置及び本数とすることにより、発生蒸気の圧力を中心部に集めて圧力をさらに高めることで流速を一層上げることができ、蒸気発生効率が飛躍的に増大する。 By arranging and arranging the primary and secondary heat transfer tubes in this way, the flow rate can be further increased by collecting the pressure of the generated steam at the center and further increasing the pressure, and the steam generation efficiency is dramatically increased. To do.

前記二次伝熱管は、前記一次伝熱管より大径の管で構成されていてもよい。 The secondary heat transfer tube may be a tube having a larger diameter than the primary heat transfer tube.

このように伝熱管のうち二次伝熱管を大径にすることで蒸発缶部の上部受入口と直接接続し、又は一体化することができ、機構の簡略化を図ることができる。 Thus, by making the secondary heat transfer tube out of the heat transfer tubes larger in diameter, it can be directly connected to or integrated with the upper receiving port of the evaporator portion, and the mechanism can be simplified.

一次、二次の伝熱管に内装された各電熱シーズヒータを個別にオン、オフ制御するように制御部に接続されていてもよい。 You may connect to the control part so that each electrothermal sheathed heater built in the primary and secondary heat exchanger tubes may be individually turned on and off .

上記構成とすることにより、加熱缶部における蒸気発生を最適の管理の下に自動制御することが可能である。 With the above-described configuration, it is possible to automatically control the generation of steam in the heating can part under optimum management.

本発明に係る純粋蒸気製造装置は、多数の細管よりなる一次、二次の伝熱管に各管毎に電熱シーズヒータを内装することにより伝熱管内を流れる供給水が直に電熱シーズヒータに触れて瞬時に加熱蒸発させるため、急速に圧力を高めて供給水（蒸気）の流速を上げ、これにより熱効率を著しく高めることができる。   In the pure steam production apparatus according to the present invention, the supply water flowing in the heat transfer tube directly touches the electric heat sheath heater by installing an electric heat sheath heater in each of the primary and secondary heat transfer tubes composed of a large number of thin tubes. Therefore, the pressure can be increased rapidly to increase the flow rate of the feed water (steam), thereby significantly increasing the thermal efficiency.

また、本発明では加熱缶部に缶胴のような缶体を必要としないため構成が簡単で装置全体の軽量化、低コスト化を図ることができる。さらに缶体に保有水を溜めるような従来の方式に比べ予熱時間を大巾に短縮することができる。   Further, in the present invention, since the heating can portion does not require a can body such as a can body, the structure is simple and the entire apparatus can be reduced in weight and cost. Furthermore, the preheating time can be greatly shortened as compared with the conventional method in which retained water is stored in the can body.

また、一次、二次の伝熱管に挿入した電熱シーズヒータは個々に又は任意にオン、オフして自動制御し又は比例制御することが可能である。   Moreover, the electrothermal sheathed heaters inserted into the primary and secondary heat transfer tubes can be automatically controlled or proportionally controlled by turning them on and off individually or arbitrarily.

以下、図１乃至図５を参照して本発明の実施例について説明する。 Embodiments of the present invention will be described below with reference to FIGS.

純粋蒸気製造装置とは、高純度蒸留水を供給水として、これを加熱手段により加熱し、高純度（純粋）蒸気を発生させる装置である。 The pure steam production apparatus is an apparatus that generates high purity (pure) steam by using high-purity distilled water as supply water and heating it with heating means.

始めに、本発明に係る純粋蒸気製造装置のシステム図について説明する。図５は、その一例を示している。   First, a system diagram of a pure steam production apparatus according to the present invention will be described. FIG. 5 shows an example.

図５に示すように、蒸気製造装置５０の加熱缶部１０に供給水供給ライン５１が接続され、ここから高純度蒸留水がプレヒータ５３を経て供給される。   As shown in FIG. 5, a supply water supply line 51 is connected to the heating can 10 of the steam production apparatus 50, and high-purity distilled water is supplied from here through a preheater 53.

図１は、本発明の純粋蒸気製造装置５０の全体を示した外観図で、図２はその縦断側面図である。   FIG. 1 is an external view showing the entire pure steam production apparatus 50 of the present invention, and FIG. 2 is a longitudinal side view thereof.

図２に示すように、この装置は加熱缶部１０と蒸発缶部２０とから構成される。加熱缶部１０は本体ケース１０ａにストレート往復型の一次、二次伝熱管２、３を設け、各伝熱管内に電熱シーズヒータ（２ａ、３ａ）を設けたものからなる。熱源となる電熱シーズヒータが伝熱管２、３内に直接組込まれることにより、高温蒸気を缶胴内に充満させるような缶胴式のものは不要である。   As shown in FIG. 2, this apparatus includes a heating can unit 10 and an evaporator unit 20. The heating can unit 10 includes a main body case 10a provided with straight reciprocating primary and secondary heat transfer tubes 2 and 3, and an electric heat sheathed heater (2a and 3a) provided in each heat transfer tube. Since the electric heat sheath heater as a heat source is directly incorporated in the heat transfer tubes 2 and 3, a can body type that fills the can body with high-temperature steam is unnecessary.

ストレート往復型の一次、二次伝熱管２、３の各上端口は、隔板１０ｄで仕切られた圧力室１０ｅに開口している。中心部の二次伝熱管３の下端口は、蒸発缶部の上部受入口４に開口している。図２に示すように、二次伝熱管３の下端を下方へ延出して延出部を上部受入口４とすることもできる。 The upper and lower ends of the straight reciprocating primary and secondary heat transfer tubes 2 and 3 open to a pressure chamber 10e partitioned by a partition plate 10d. The lower end port of the secondary heat transfer tube 3 in the center is open to the upper receiving port 4 of the evaporator portion. As shown in FIG. 2, it may be an extension part and an upper receiving opening 4 extending the lower end of the secondary heat transfer tubes 3 downwardly.

一次伝熱管２の各下端口は隔板１０ｆで仕切られた下部の圧力室１０ｇに開口している。   Each lower end opening of the primary heat transfer tube 2 opens into a lower pressure chamber 10g partitioned by a partition plate 10f.

一次、二次の各伝熱管２、３に内装された電熱シーズヒータ２ａ、３ａの上端部は隔板１０ｈを貫通して外部へ突出させている。この各突出部を夫々各別に電源への接続部となしている。   The upper end portions of the electric heat sheathed heaters 2a and 3a housed in the primary and secondary heat transfer tubes 2 and 3 penetrate the partition plate 10h and project outside. Each of the protrusions is individually connected to a power source.

伝熱管２、３内にはシーズヒータ２ａ、３ａが挿入されているので、夫々の管内壁とシーズヒータ外面との間に環状の空隙が上下に亘って構成されている。この環状の空隙が供給水の通路となる。   Since the sheathed heaters 2a and 3a are inserted into the heat transfer tubes 2 and 3, an annular gap is formed between the inner wall of each tube and the outer surface of the sheathed heater. This annular gap serves as a supply water passage.

蒸発缶部２０は、図２に示すように円筒状の缶胴ケース２０ａをアウターケースにして、その内部に同心に円筒部５と、環状の隔壁１２及び外周にサイクロン外筒１３と一体に設けたものからなる。円筒部５の下端口５ａは缶胴ケース２０ａの底部との間に下端膨張室６となる空間を形成している。   As shown in FIG. 2, the evaporator 20 has a cylindrical can barrel case 20 a as an outer case, and is provided integrally with the cylindrical portion 5, the annular partition wall 12, and the cyclone outer cylinder 13 on the outer periphery. It consists of things. A space serving as a lower end expansion chamber 6 is formed between the lower end opening 5a of the cylindrical portion 5 and the bottom portion of the can body case 20a.

図３は、図２加熱缶部１０の上部のＡ−Ａ面で切断した切断図である。図３に示すように、供給水を上部の圧力室１０ｅに圧送するための一次側の伝熱管２は、最外周に８本とそのすぐ内側に４本設けられている。また下降側の二次伝熱管３は中心部に１本設けている。１本の場合は一次伝熱管より太い径の管を用い下部を延出して受入口４と一体に形成する。２〜３本の場合は別体に構成した受入口４に上方より挿入したものとする。 3 is a cross-sectional view taken along the AA plane at the top of the heating can 10 in FIG. As shown in FIG. 3, eight primary side heat transfer tubes 2 for feeding the supplied water to the upper pressure chamber 10 e are provided on the outermost periphery and four on the inner side. One descending secondary heat transfer tube 3 is provided at the center. In the case of one, a pipe having a diameter larger than that of the primary heat transfer pipe is used and the lower part is extended to be formed integrally with the receiving port 4. In the case of two or three, it shall be inserted into the receiving port 4 comprised separately from the upper direction.

図４に示すように、伝熱管２、３の各管内に挿入したシーズヒータ２ａ、３ａは上端を管端口より突出させて固定し管内壁との間に供給水の通路となるようにスペーサを介装して環状の空隙が管内の全長に形成されている。   As shown in FIG. 4, the sheathed heaters 2a and 3a inserted into the tubes of the heat transfer tubes 2 and 3 are fixed with the upper ends protruding from the tube end ports, and spacers are provided so as to provide a supply water passage between the tube inner walls. An annular gap is formed in the entire length of the pipe.

図５は本発明の一実施例を示す純粋蒸気製造装置のシステム図で、５２は供給水圧送用のポンプであり、プレヒーター５３を通して加熱缶部１０に供給される。５４は制御盤、５５は各電熱シーズヒータ２ａ、３ａをマルチ的にオン、オフ制御するための比例制御装置で、５６は流量計、５７は圧力センサーである。   FIG. 5 is a system diagram of a pure steam production apparatus showing an embodiment of the present invention. Reference numeral 52 denotes a pump for feeding water pressure, which is supplied to the heating can 10 through a preheater 53. 54 is a control panel, 55 is a proportional control device for controlling each of the electrothermal sheathed heaters 2a and 3a in a multi-on / off manner, 56 is a flow meter, and 57 is a pressure sensor.

［作用］
電熱シーズヒータ２ａ、３ａを加熱した状態で供給水を加熱缶部１０の下部の供給水取入口１より供給すると、この供給水は下部の圧力室１０ｇより一次伝熱管２の下端口より管内壁とシーズヒータ２ａとの間の空隙を通って上昇し上部の圧力室１０ｅに至る。この時供給水は管内において直接電熱シーズヒータの外面に接触するため急激に加熱されて蒸気となり、その上狭い空隙を通過することで圧力が高められる。さらに上部の圧力室１０ｅから中心部にある二次伝熱管３を通って蒸発缶部２０の円筒部５の上部受入口４に送入される。この為供給水は伝熱管２、３を通過する間に所定の高温度に加熱されて蒸気となり、さらにその圧力で蒸気と飽和水の気液２相流体で円筒部５内へ圧送され下端口５ａより膨張室６を経て環状室７を上昇し圧力を高めながらサイクロン８により中心内方へ向う旋回流となってサイクロン室１１、隔壁１２の内側の通路を上昇し分離室１４より取出口９へ送出されるものであって、このような流れの間に最終的に液滴が分離除去されて高純度の純粋蒸気が得られるものである。 [Action]
When supply water is supplied from the supply water intake 1 at the lower part of the heating can 10 with the electric heat-heated heaters 2a and 3a heated, the supply water is supplied from the lower pressure chamber 10g to the inner wall of the primary heat transfer pipe 2 from the lower end port. And rises through the gap between the sheathed heater 2a and reaches the upper pressure chamber 10e. At this time, the supply water directly contacts the outer surface of the electrothermal sheathed heater in the pipe, so that it is rapidly heated to become steam, and the pressure is increased by passing through a narrow gap. Further, the gas is fed from the upper pressure chamber 10 e through the secondary heat transfer tube 3 in the center to the upper receiving port 4 of the cylindrical portion 5 of the evaporator portion 20. For this reason, the feed water is heated to a predetermined high temperature while passing through the heat transfer tubes 2 and 3 to become steam, and is further pumped into the cylindrical portion 5 by the gas-liquid two-phase fluid of steam and saturated water at that pressure. From 5 a, the annular chamber 7 is raised through the expansion chamber 6, and the pressure is increased, and a cyclonic flow toward the center inward is made by the cyclone 8, and the passage inside the cyclone chamber 11 and the partition wall 12 is raised and the outlet 9 is removed from the separation chamber 14. In such a flow, the droplets are finally separated and removed during such a flow to obtain high purity pure vapor .

本実施例では、加熱缶部と蒸発缶部が一体化した構成を例示したが、本発明の最大の特徴部分は、蒸気発生部分を担う伝熱管の構成にあり、その他の部分については従来の技術を適用することができる。   In the present embodiment, the configuration in which the heating can portion and the evaporator portion are integrated is exemplified, but the most characteristic part of the present invention is the configuration of the heat transfer tube that bears the steam generating portion, and the other portions are the conventional ones. Technology can be applied.

比例制御装置５５は図５に示すシステム回路に組込まれ、サイリスタによる制御又はマグネットによる制御とし、圧力センサー５７によりユースポイントへのクリーンスチーム（純粋蒸気）の圧力の高低をキャッチして調節計により圧力が高いときは下げ、低いときは上げるように自動調節するものである。   The proportional control device 55 is incorporated in the system circuit shown in FIG. 5, and is controlled by a thyristor or a magnet. The pressure sensor 57 catches the level of clean steam (pure steam) pressure to the use point, and the pressure is adjusted by a controller. It is automatically adjusted so that it is lowered when the value is high and raised when it is low.

本発明の一実施例を示す純粋蒸気製造装置の外観図（斜視図）である。BRIEF DESCRIPTION OF THE DRAWINGS It is an external view (perspective view) of the pure steam manufacturing apparatus which shows one Example of this invention. 同上の縦断側面図である。It is a vertical side view same as the above. 図２におけるＡ−Ａ線の断面図である。It is sectional drawing of the AA in FIG. 加熱缶部上部の縦断側面図Vertical side view of the upper part of the heating can 本発明の一実施例を示す純粋蒸気製造装置のシステム図である。1 is a system diagram of a pure steam production apparatus showing an embodiment of the present invention.

１ 供給水取入口
２、３ 伝熱管
２ａ、３ａ 電熱シーズヒータ
４ 上部受入口
１０ 加熱缶部
２０ 蒸発缶部 DESCRIPTION OF SYMBOLS 1 Supply water inlet 2, 3 Heat exchanger tube 2a, 3a Electric heating sheath heater 4 Upper inlet 10 Heating can part 20 Evaporating can part

Claims (3)

加熱缶部と蒸発缶部とを備えた純粋蒸気製造装置であって、
前記加熱缶部は、
ストレート管で構成された複数本の一次伝熱管と、ストレート管で構成された１本又は複数本の二次伝熱管と、上部圧力室及び下部圧力室と、複数の電熱シーズヒータとを含み、
前記一次伝熱管の一端はいずれも供給水を前記加熱缶部に取入れるための供給水取入口に接続されると共に前記下部圧力室に接続されており、
前記一次伝熱管の他端はいずれも前記上部圧力室に接続されており、
前記二次伝熱管の一端はいずれも前記上部圧力室に接続される一方でそれらの他端は前記下部圧力室を貫通して前記蒸発缶部に接続されており、
前記複数の電熱シーズヒータは、いずれも前記一次伝熱管及び二次伝熱管のそれぞれに内装され前記伝熱管の管内壁と前記電熱シーズヒータ外面との間に狭い空隙が前記上部圧力室から前記下部圧力室まで上下に亘って設けられていると共に、その一端が前記上部圧力室を貫通して前記加熱缶部の上方に突出しその突出した上端部の夫々を各電源部への接続部となし、
前記加熱缶部に取り入れた供給水を前記電熱シーズヒータにより加熱しながら前記空隙内を通過させて蒸気と液滴の混合状態にある気液２相流体を発生させ、前記伝熱管内で発生した蒸気の圧力により前記気液２相流体を前記伝熱管を通じて前記蒸発缶部に圧送するように構成され、
前記二次伝熱管は前記加熱缶部の中心部に配置される一方、前記一次伝熱管は前記二次伝熱管の外側に配置されており、
前記二次伝熱管は、前記一次伝熱管より少ない本数で構成されていることを特徴とする純粋蒸気製造装置。 A pure steam production apparatus having a heating can part and an evaporation can part,
The heating can part is
A plurality of primary heat transfer tubes composed of straight tubes, one or a plurality of secondary heat transfer tubes composed of straight tubes, an upper pressure chamber and a lower pressure chamber, and a plurality of electric heat sheathed heaters,
One end of the primary heat transfer tube is connected to a supply water inlet for taking supply water into the heating can part and to the lower pressure chamber,
The other end of the primary heat transfer tube is connected to the upper pressure chamber,
One end of the secondary heat transfer tube is connected to the upper pressure chamber, while the other end of the secondary heat transfer tube penetrates the lower pressure chamber and is connected to the evaporator portion.
Each of the plurality of electric heat sheathed heaters is provided in each of the primary heat transfer tube and the secondary heat transfer tube, and a narrow gap is formed between the inner wall of the heat transfer tube and the outer surface of the electric heat sheathed heater from the upper pressure chamber to the lower portion. It is provided over the pressure chamber up and down, one end of the upper pressure chamber penetrates the upper portion of the heating can and the upper end of the projection is connected to each power supply,
The supply water taken into the heating can is heated by the electric heat sheath heater while passing through the gap to generate a gas-liquid two-phase fluid in a mixed state of steam and droplets, and generated in the heat transfer tube. The gas-liquid two-phase fluid is configured to be pumped to the evaporator portion through the heat transfer tube by the pressure of steam ,
The secondary heat transfer tube is disposed at the center of the heating can part, while the primary heat transfer tube is disposed outside the secondary heat transfer tube,
The said secondary heat exchanger tube is comprised with the number fewer than the said primary heat exchanger tube, The pure steam manufacturing apparatus characterized by the above-mentioned . 前記二次伝熱管は、前記一次伝熱管より大径の管で構成されていることを特徴とする請求項１記載の純粋蒸気製造装置。 The pure steam production apparatus according to claim 1 , wherein the secondary heat transfer tube is configured by a tube having a diameter larger than that of the primary heat transfer tube. 前記一次、二次の伝熱管に内装された各電熱シーズヒータを個別にオン、オフ制御するように制御部に接続されていることを特徴とする請求項１又は２記載の純粋蒸気製造装置。 The pure steam production apparatus according to claim 1 or 2 , wherein each of the electric heat sheathed heaters installed in the primary and secondary heat transfer tubes is connected to a control unit so as to be turned on and off individually.
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