JP2004293879A - Steam producing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam generating device which is compact in comparison with a conventional one, and has the sufficient strength even when high pressure is applied to the inside. <P>SOLUTION: This steam generating device includes a heating can part 10 having a function of a heater, and a steam can part 20 having a function for generating the steam and a steam-liquid separating function, and the heating can part 20 is constituted to heat the supplied water taken from a supplied water inlet 1 through heating tubes 2, 3 to generate a steam and liquid droplets mixture state by the pressure of the generated steam, and to pressure feed the same to an upper receiving port 4 of the steam can part 20. A coiled part is formed on at least a part of the steam heating tubes 2, 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a high-purity steam production apparatus used in fields such as medical institutions, pharmaceuticals, and food production.
[0002]
[Prior art]
This type of device includes a heating can unit having the function of a heater, and an evaporating can unit having a function of generating steam and a gas-liquid separation function, and generates steam by heating high-purity distilled water. It is common to employ a mechanism for extracting steam by a gas-liquid separator.
[0003]
Conventionally, high-purity distilled water is passed through a straight and long narrow tube (straight tube) to generate steam by heating with a heat source placed around the tube (for example, see Patent Literature 1 and Patent Literature 2).
[0004]
[Patent Document 1]
JP-A-2000-161602 (5th, 12th to 15th paragraphs, FIG. 1)
[Patent Document 2]
JP-A-2002-162001 (Paragraph 18, FIG. 1 to FIG. 3)
[0005]
[Problems to be solved by the invention]
However, since the conventional apparatus has low steam generation efficiency, the heating can part had to be very long in order to obtain a sufficient amount of generated steam.
[0006]
Further, in the conventional apparatus, since the heat transfer tube (evaporation tube) for generating steam is a straight tube, expansion and contraction is almost impossible, so that it is weak in strength and easily broken.
[0007]
In addition, in the 18th paragraph of Patent Document 2, it is described that an evaporator composed of a spiral tube may be used, but a specific structure is not shown. It became clear that an efficient falling liquid film was not formed in the spiral tube (spiral tube), and the steam generation efficiency was low.
[0008]
In addition, since this device generates high steam pressure inside the heat transfer tube, which is the steam generation section, high pressure is applied.In order to comply with the standards stipulated by laws and regulations, a high pressure vessel must be specified. This requires a lot of cost and labor such as inspection.
[0009]
In view of the above, it is an object of the present invention to provide a steam generator which is more compact than before and has sufficient strength even when high pressure is applied to the inside.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a steam production device according to the present invention is a device for producing high-purity distilled water or high-purity steam, and includes a heating can unit 10 having a function of a heater, and a steam generation unit. The heating can section 10 includes a vaporizing can section 20 having a function of causing water to flow and a gas-liquid separating function. And the pressure is fed to the upper receiving port 4 of the evaporator unit 20 by a pressure, so that a part of the steam heat transfer tubes 2 and 3 includes a coil-shaped portion (spiral tube). Features.
[0011]
By including a coil-shaped portion (spiral tube) in at least a part of the heat transfer tube, which has conventionally been formed of a straight tube and thus easily broken, the strength against expansion and contraction is increased, and laws and regulations (eg, occupational health and safety) Exemption from high-pressure vessels specified by the law, etc.), eliminating the need to undergo inspections to pass the standards. This is a great advantage not only for the manufacturer of the device, but also for the user who purchases and maintains the device.
[0012]
In particular, in this device, the heat transfer tube 3 connected to the upper receiving port 4 side is provided with a spiral portion 31 above an intermediate portion of the heat transfer tube 3, and the other portions are constituted by straight tubes 32, 33. Preferably.
[0013]
When the heat transfer tube 3 is formed in such a shape, the device becomes more compact than before, and the steam generation efficiency is dramatically increased.
[0014]
Further, the heat transfer tube 2 located outside the heat transfer tube 3 is configured such that both ends are formed of straight tubes, and at least a part of the heated steam inlet 10b and the outlet 10c face the straight tube portion. Is preferred.
[0015]
If the entrance and exit 10b and 10c of the heating steam face the portion of the heat transfer tube 2 justified by the straight tube as described above, the heating steam efficiently transfers heat into the heat transfer tube. Is enhanced.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS. The steam producing apparatus is an apparatus that generates high-purity steam by using high-purity distilled water as supply water and heating the same by a heating unit.
[0017]
First, a system diagram of a steam production device according to the present invention will be described. FIG. 5 shows an example.
[0018]
As shown in FIG. 5, a heating steam supply line 51 is connected to the heating can section 10 of the steam producing apparatus 50, and steam heated to a high temperature is introduced therefrom. Further, a supply water supply line 52 is connected to the evaporator section 20 of the steam production device 50, and high-purity distilled water is supplied therefrom.
[0019]
It is general that the supply water (high-purity distilled water) is introduced in advance through a preheater 53, a degassing can 54 and the like. Various forms of connection of each pipe can be considered depending on the design.
[0020]
FIG. 1 is a longitudinal sectional side view of an entire structure showing an embodiment of a steam producing apparatus 50 according to the present invention. As shown in FIG. 1, the apparatus includes a heating can section 10 and an evaporating can section 20. The heating can portion 10 has a heating steam inlet 10b and an outlet 10c for opening and closing a heat source on an outer surface of the main body case 10a, and a primary part including a coil-shaped spiral tube in a hollow interior of the main body case. The secondary heat transfer tubes 2 and 3 are provided.
[0021]
The upper end of each of the primary and secondary heat transfer tubes 2 and 3 opens to a pressure chamber 10e partitioned by a partition 10d. The lower end of the secondary heat transfer tube 3b at the center is open to the upper receiving port 4 of the evaporator 20 while the lower end of the primary heat transfer tube 2a is opened to the lower chamber 14 of the heating can 10 and supplied from there. Water flows in.
[0022]
As shown in FIG. 1, the evaporating can section 20 has a cylindrical can body case 20a as an outer case, and the cylindrical section 5, the annular partition wall 12, and the outer cyclone outer cylinder 13 are integrally formed concentrically therein. It is composed of those provided. The cylindrical portion 5 is supported by the upper end wall 15 in a suspended manner, and faces the upper receiving port 4 so that the lower end of the heat transfer tube 3 opens. The lower end 5a of the cylindrical portion 5 forms a space serving as the lower expansion chamber 6 between the lower end 5a and the bottom of the can body case 20a.
[0023]
FIG. 2A is a cross-sectional view taken along the AA plane of the upper portion of the heating can unit 20 of FIG. The heat transfer tubes 2 for feeding the supply water to the pressure chamber 10e by pressure are provided at eight (2a) at the outermost periphery and at four (2b) immediately inside thereof. In addition, four heat transfer tubes 3 for flowing down the supply water pumped to the pressure chamber 10e are provided on the innermost circumference of the heating can.
[0024]
As shown in FIG. 2B, the cyclone 8 has a plurality of window holes 8a cut in a tangential direction so that a swirling flow is generated toward the center on the outer peripheral surface of the upper part of the cyclone outer cylinder 13, and the cyclone 8 becomes thinner toward the back. It is formed by guide pieces 8c divided so as to form a passage 8b having a width, and is provided at three or four places at equal circumferential intervals.
[0025]
FIG. 3A shows a side view of the secondary heat transfer tube 3 provided on the innermost circumference. As shown in this figure, the upper part includes a spiral tube 31 and the other is constituted by straight tubes 32 and 33. Note that, as described above, only one is shown in FIG. 1, but in this embodiment, four are provided in combination.
[0026]
FIG. 3B is a side view of the primary heat transfer tube 2b provided inside the outermost heat transfer tube. As shown in this figure, the upper and lower portions are constituted by straight tubes 22b and 23b, and the central portion is constituted by a spiral tube 21b having the same diameter.
[0027]
FIG. 3C shows a side view of the primary heat transfer tube 2a provided on the outermost periphery. As shown in the figure, the primary heat transfer tube 2a has upper and lower straight tubes 22a and 23a, and a central portion is a spiral tube 21a having the same diameter as the outer periphery of the primary heat transfer tube 2b and having the same inner diameter. Be composed.
[0028]
As illustrated in FIGS. 1 and 2, all the heat transfer tubes (2 a, 2 b, 3) are arranged so that each of the same shape and the same size enters into the gap between them, and are symmetric with respect to the center axis of the coil. It is preferable that they are provided uniformly so that FIG. 4 shows a front view of one of the heat transfer tubes (2a, 2b, 3) viewed from the end. If these coils are arranged while being shifted from each other in the circumferential direction, a plurality of coils of the same shape and the same size can be accommodated in the volume occupied by one heat transfer tube. It becomes.
[0029]
[Action]
When heating steam as a heat source is sent into the heating can portion 10 from the heating steam inlet 10b, the steam is filled in the can and flows out from the outlet 10c. And the heat transfer tubes 2 and 3 are heated.
[0030]
When supply water is supplied from the supply water inlet 1 in this state, the supply water passes through the primary heat transfer tube 2 to reach the pressure chamber (upper chamber) 10e, and further from the pressure chamber 10e, the secondary heat transfer tube 2 at the center portion. Through the upper portion of the cylindrical portion 5 of the evaporator 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 furthermore, is sent under pressure to the cylindrical portion 5 with steam and saturated water in a gas-liquid two-phase fluid, and is sent from the lower end port. While rising the annular chamber 7 through the expansion chamber 6 and increasing the pressure, the cyclone 8 forms a swirling flow inward toward the center by the cyclone 8 to raise the pressure path 15 inside the cyclone chamber 11 and the partition wall 12 and take out from the separation chamber 14. The droplets are finally separated and removed during such a stream to obtain high-purity steam.
[0031]
As described above, the supply water pumped to the pressure chamber 10e flows down through the innermost secondary heat transfer tube 3, but the supply water passes through the spiral tube 31 provided above the heat transfer tube 3. At this time, since the flow velocity is restricted and becomes slow, a thin water film uniformly covers the inner wall of the pipe, and a falling liquid film (so-called “wet wall”) is formed. As it is, the water film flows down the inner wall surface due to gravity. At this time, high-purity steam is generated by being heated by surrounding heating steam.
[0032]
Strictly speaking, immediately after passing through the spiral tube 31, the surface state is rough, so a uniform water film does not uniformly cover the inside of the tube, but is then rectified as it flows down the straight tube by gravity, It will be in a state of being more easily evaporated. In this sense, the spiral tube only needs to be located at least in a portion above the middle, and the other portions 32 and 33 are preferably straight tubes.
[0033]
In the embodiment, eight outermost primary heat transfer tubes 2a and four inner primary heat transfer tubes 2b are provided. However, it is important to provide a plurality of primary heat transfer tubes 2a. Matters. When a plurality of spiral tubes are used in this manner, a large amount of supply water can be pumped to the pressure chamber 10e at a low flow rate, so that steam generation efficiency can be increased and steam can be stably generated.
[0034]
Further, since the heat transfer tube 3 in which the spiral tube and the straight can are combined as in this embodiment has a large degree of freedom for expansion and contraction, it has higher mechanical strength than a conventional steam production device. Usually, a large amount of steam is generated inside the heat transfer tube 3 and high pressure is applied. Therefore, the high pressure vessel specified by the Ordinance for Enforcement of the Industrial Safety and Health Act is specified, but in the case of this device, the size of the device is large. By clearing certain conditions, such as the criterion, it is not specified, and there is no need to undergo an inspection to pass the standard. This is a great advantage not only for the manufacturer of the device, but also for the user who purchases and maintains the device.
[0035]
In the present embodiment, the configuration in which the evaporator and the heating can are integrated has been exemplified, but the most characteristic feature of the present invention is the shape of the heat transfer tube that serves as the steam generating portion, and the other portions apply the conventional technology. can do. For example, a configuration may be adopted in which the evaporating can section and the heating can section are separate casings and both are connected by piping.
[0036]
【The invention's effect】
The steam production apparatus according to the present invention has higher steam generation efficiency than the conventional apparatus, is compact, and has high mechanical strength.
[Brief description of the drawings]
FIG. 1 is a vertical sectional side view of the entire structure of a steam producing apparatus according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional plan view taken along line AA and line BB in FIG.
FIG. 3 is a side view showing one heat transfer tube in FIG. 1;
FIG. 4 is a front view showing an end of each heat transfer tube in FIG. 1;
FIG. 5 is a system diagram of a steam production apparatus showing one embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Supply water inlet 2, 3 Heat transfer tube 4 Upper receiving port 5 Cylindrical part 6 Expansion chamber 7 Annular chamber 8 Cyclone 9 Outlet 10 Heating can part 11 Cyclone chamber 12 Partition wall 13 Cyclone outer cylinder 14 Lower chamber 20 Evaporation can part 50 Steam Production equipment 51 Heated steam supply line 52 Supply water supply line 53 Preheater 54 Degassing can

Claims (3)

An apparatus for producing high-purity distilled water or high-purity steam, comprising: a heating can section (10) having a function of a heater; and an evaporating section (20) having a function of generating steam and a gas-liquid separation function. The heating can section (10) heats the supply water taken in from the supply water inlet (1) through the heat transfer tubes (2, 3) and mixes the steam and the droplets with the pressure of the generated steam. Wherein the heat transfer tubes (2, 3) include a coil-shaped portion in a part thereof. . The heat transfer tube (3) connected to the upper receiving port (4) has a spiral portion (31) provided above an intermediate portion of the heat transfer tube (3), and the other portions have straight tubes (32, 33. The steam producing apparatus according to claim 1, comprising: The heat transfer tube (2) located outside the heat transfer tube (3) is configured such that both ends are formed of straight tubes, and the heated steam inlet (10b) and the outlet (10c) face the straight tube portion. The steam production apparatus according to claim 1, wherein the apparatus is configured.

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