JP4104065B2 - Steam production equipment - Google Patents

Description

[0001]
BACKGROUND 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 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.
[0003]
Conventionally, steam is generated in a portion where steam is generated by passing high-purity distilled water through a straight long thin tube (straight tube) and heated by a heat source arranged around the tube (for example, patents). Reference 1 and Patent Reference 2).
[0004]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-161602 (5th, 12th to 15th paragraphs, FIG. 1)
[Patent Document 2]
JP 2002-162001 A (18th paragraph, FIGS. 1 to 3)
[0005]
[Problems to be solved by the invention]
However, since the conventional apparatus has low steam generation efficiency, in order to obtain a sufficient generation amount, the heating can part has to be very long.
[0006]
In the conventional apparatus, since the heat transfer tube (evaporation tube) for generating steam is a straight tube, the expansion and contraction is almost impossible, so that it is weak in strength and easily damaged.
[0007]
In addition, in the 18th paragraph of Patent Document 2, it is described that an evaporator made of a spiral tube may be used. However, a specific structure is not illustrated, and according to the experiment of the present inventor, It was revealed 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 a high pressure inside the heat transfer tube, which is the steam generator, it must be designated as a high pressure vessel in order to comply with the standards stipulated by laws and regulations. For this reason, a lot of cost and labor such as inspection are required.
[0009]
The present invention has been made in view of the above, and an object thereof is to provide a steam generator that is more compact than conventional ones and has sufficient strength even when high pressure is applied to the inside.
[0010]
In order to solve the above-mentioned problems, a steam production apparatus according to the present invention is an apparatus for producing high-purity steam, and has a pressure chamber 10e partitioned by a partition plate 10d at the top to function as a heater. multiple heating cans 10, includes a evaporator unit 20 having a function of generating steam and gas-liquid separation function, the feed water the heating cans portion 10 incorporating a supply water intake 1 comprises Ru The heat transfer tubes 2 and 3 are heated and mixed with steam and droplets with the pressure of the generated steam, and are sent to the upper receiving port 4 of the evaporator 20 through the pressure chamber . 3 is a plurality of first heat transfer tubes 2 of the same shape and size for pumping the supply water to the pressure chamber, and the same shape and size for causing the feed water pumped to the pressure chamber to flow down by gravity. A plurality of second heat transfer tubes 3, wherein the first heat transfer tubes 2 are at least medium The second heat transfer tube 3 includes a spiral tube only in a part above the intermediate portion of the heat transfer tube, and the first and second heat transfer tubes 2 are formed of a spiral tube having the same diameter. , 3 are connected to the pressure chamber 10e via the partition plate 10d, and the heat transfer tubes 2 and 3 of the same shape and size enter the gap between each other and with respect to the central axis thereof. It is provided uniformly so as to be symmetrical.
[0011]
By including a coiled portion (spiral tube) in at least a part of the heat transfer tube that has been conventionally configured with a straight tube, the strength against expansion and contraction is increased. The high pressure vessel designated by the law enforcement order etc.) will be excluded from designation, and it will no longer be necessary to undergo an inspection to pass the standard. This is a great advantage not only for manufacturers who manufacture devices but also for users who purchase and maintain the devices.
[0013]
When the heat transfer tube 3 has such a shape, the apparatus becomes more compact than the conventional one, and the steam generation efficiency increases dramatically.
[0014]
Furthermore, said outside the second heat transfer tube first heat transfer tubes are disposed, together with the formed first and second heat transfer pipe are both straight pipes both ends, the heating steam inlet It is preferable that the outlet is configured to face the straight pipe portion.
[0015]
As described above, when the heating steam outlets 10b and 10c face the portion of the heat transfer tube 2 that is formed of a straight tube, the heating steam efficiently transfers heat into the heat transfer tube. Is increased.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS. The steam production apparatus is an apparatus that generates high-purity steam by using high-purity distilled water as supply water and heating it with heating means.
[0017]
First, a system diagram of a steam production apparatus according to the present invention will be described. FIG. 5 shows an example thereof.
[0018]
As shown in FIG. 5, a heating steam supply line 51 is connected to the heating can 10 of the steam producing apparatus 50, and steam heated to a high temperature is introduced from here. Moreover, the supply water supply line 52 is connected to the evaporator part 20 of the steam production apparatus 50, and high purity distilled water is supplied from here.
[0019]
In general, the supply water (high-purity distilled water) is introduced in advance through a preheater 53, a degassing can 54, or the like. As for the connection of each pipe, various forms are conceivable depending on the design.
[0020]
FIG. 1 is a longitudinal side view of the entire structure showing an embodiment of a steam production apparatus 50 according to the present invention. As shown in FIG. 1, this apparatus includes a heating can unit 10 and an evaporator unit 20. The heating can 10 has a heating steam inlet 10b and an outlet 10c, which are provided with a heat source on the outer surface of the main body case 10a. The primary part of the heating can 10 includes a coiled spiral tube in a hollow portion of the main body case. The secondary heat transfer tubes 2 and 3 are provided.
[0021]
The upper end ports of the 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 3b in the center portion opens to the upper receiving port 4 of the evaporator 20, while the lower end port of the primary heat transfer tube 2a opens to the lower chamber 14 of the heating can unit 10 and is supplied from here. Water flows in.
[0022]
As shown in FIG. 1, the evaporator 20 has a cylindrical can barrel case 20a as an outer case, and the cylindrical portion 5, the annular partition wall 12 and the outer peripheral cyclone outer cylinder 13 are integrally formed concentrically therein. It consists of what was provided. The cylindrical portion 5 is supported in a suspended manner on the upper end wall 15 and faces the upper receiving port 4 so that the lower end of the heat transfer tube 3 opens. A space serving as the lower expansion chamber 6 is formed between the lower end 5a of the cylindrical portion 5 and the bottom of the can body case 20a.
[0023]
FIG. 2A shows a cross-sectional view taken along the AA plane at the top of the heating can 20 of FIG. The heat transfer tubes 2 for pumping the supply water to the pressure chamber 10e are provided on the outermost periphery (8a) (2a) and on the inner side thereof (4b). Moreover, the four heat exchanger tubes 3 for flowing down the supply water pressure-fed to the pressure chamber 10e are provided in the innermost periphery of a 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 in the central direction on the outer peripheral surface of the upper part of the cyclone outer cylinder 13, and the cyclone 8 becomes narrower toward the back. The guide piece 8c is divided so as to form a width passage 8b, and is provided at three or four places at equal circumferential intervals.
[0025]
Fig.3 (a) has shown the side view of the secondary heat exchanger tube 3 provided in the innermost periphery. As shown in this figure , a spiral tube 31 is included in a part of the upper portion , and the other is composed of straight tubes 32 and 33. As described above, only one is shown in FIG. 1, but in this embodiment, four are actually provided in combination.
[0026]
FIG.3 (b) has shown the side view of the primary heat exchanger tube 2b provided inside the outermost peripheral heat exchanger 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.3 (c) has shown the side view of the primary heat exchanger tube 2a provided in the outermost periphery. As shown in this figure, the primary heat transfer tube 2a is composed of straight tubes 22a and 23a at the upper and lower portions, and the central portion is a spiral tube 21a of the same diameter having an inner periphery substantially the same diameter as the outer periphery of the primary heat transfer tube 2b. Composed.
[0028]
In addition, as illustrated in FIGS. 1 and 2, all the heat transfer tubes (2a, 2b, 3) are arranged so that the same shape and the same size enter each other and are symmetrical with respect to the central axis of the coil. It is preferable that they are uniformly provided. FIG. 4 shows a front view of one of the heat transfer tubes (2a, 2b, 3) seen from the end. If they are arranged while being shifted from each other in the circumferential direction, a plurality of coils of the same shape and size can be accommodated in the volume occupied by one heat transfer tube, so that it can be made compact and the temperature distribution is uniform. It becomes.
[0029]
[Action]
When heated steam as a heat source is fed into the heated can 10 from the heated steam inlet 10b, the steam fills the can and flows out from the outlet 10c. 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 the pressure chamber (upper chamber) 10e, and further from the pressure chamber 10e to the secondary heat transfer tube 2 in the center. Through the upper receiving port 4 of the cylindrical part 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 and becomes steam, and is further pumped to the cylindrical portion 5 by the gas-liquid two-phase fluid of steam and saturated water at that pressure and from the lower end port. The annular chamber 7 is lifted through the expansion chamber 6 and the pressure is increased, and the cyclone 8 turns into a swirl flow toward the center inward, and the pressure path 15 inside the cyclone chamber 11 and the partition wall 12 is raised and taken out from the separation chamber 14. In this flow, the droplets are finally separated and removed during such a flow to obtain high-purity vapor.
[0031]
As described above, the supply water pumped to the pressure chamber 10e flows down through the secondary heat transfer tube 3 at the innermost periphery, but the supply water passes through the spiral tube 31 provided above the heat transfer tube 3. At this time, since the flow rate is limited and slows down, the inner wall of the pipe is uniformly covered with a thin water film to form a falling liquid film (so-called “wetting wall”). As it is, the water film flows down the inner wall surface by gravity. At this time, the water film is heated by the surrounding heating steam to generate high-purity steam.
[0032]
Strictly speaking, since the surface state is rough immediately after passing through the spiral tube 31, the uniform water film does not cover the inside of the tube uniformly, but is then rectified as it flows down by gravity in the straight tube, It will be in the state which is still more easily evaporated. In this sense, the spiral tube only needs to be at least a part 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 heat transfer tubes 2b are provided, but it is important to provide a plurality of primary heat transfer tubes 2b. It is a matter. When a plurality of spiral tubes are used in this way, 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 improved and steam can be generated stably.
[0034]
Furthermore, 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, the mechanical strength is higher than that of the conventional steam production apparatus. Usually, a large amount of steam is generated inside the heat transfer tube 3 and a high pressure is applied. Therefore, it is a target for the designation of a high pressure vessel as stipulated in the Ordinance of the Industrial Safety and Health Act. By clearing certain conditions such as this, it will be excluded from designation, and it will not be necessary to undergo an inspection to pass the standard. This is a great advantage not only for manufacturers who manufacture devices but also for users who purchase and maintain the devices.
[0035]
In the present embodiment, the configuration in which the evaporator and the heating can are integrated is illustrated, but the greatest characteristic part of the present invention is the shape of the heat transfer tube that bears the steam generation part, and the conventional technology is applied to the other parts. can do. For example, a configuration in which the evaporator portion and the heating can portion 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 longitudinal side view of an overall structure of a steam production apparatus showing an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional plan view taken along line AA and BB in FIG. 1;
FIG. 3 is a side view showing one heat transfer tube in FIG. 1;
4 is a front view showing an end portion of each heat transfer tube in FIG. 1. FIG.
FIG. 5 is a system diagram of a steam production apparatus showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Supply water inlet 2, 3 Heat exchanger tube 4 Upper inlet 5 Cylindrical part 6 Expansion chamber 7 Annular chamber 8 Cyclone 9 Outlet 10 Heating can part 11 Cyclone chamber 12 Partition 13 Cyclone outer cylinder 14 Lower chamber 20 Evaporator part 50 Steam Manufacturing equipment 51 Heated steam supply line 52 Supply water supply line 53 Pre-heater 54 Degassing can

Claims (2)

An apparatus for producing high-purity vapor, comprising a heating cans unit Ru provided with a function of the heater has a pressure chamber partitioned by the diaphragm at the top, and a function of generating steam and gas-liquid separation function The heating can portion heats the supply water taken from the supply water inlet through a plurality of heat transfer tubes to form a mixed state of the steam and droplets with the pressure of the generated steam, and the pressure chamber is And is configured to be pumped to the upper receiving port of the evaporator portion,
The heat transfer tube has a plurality of first heat transfer tubes of the same shape and size for pumping the supply water to the pressure chamber, and the same shape and shape for causing the supply water pumped to the pressure chamber to flow down by gravity. A large number of second heat transfer tubes,
The first heat transfer tube is formed of a spiral tube having the same diameter at least in the central portion, while the second heat transfer tube includes a spiral tube only at a part above the intermediate portion of the heat transfer tube,
The first and second heat transfer tubes are both connected to the pressure chamber via the partition plate, and the heat transfer tubes having the same shape and the same size enter the gap between each other and the central axis thereof The steam production apparatus is characterized by being uniformly provided so as to be symmetric with respect to each other. The first heat transfer tube is disposed outside the second heat transfer tube ,
Both the first and second heat transfer tubes are constituted by straight tubes at both ends,
The steam production apparatus according to claim 1, wherein the heating steam inlet and the outlet are configured to face the straight pipe portion.

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