JPH09152189A - Heat accumulative type vapor generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a small-sized device and reduce its cost by a method wherein there are provided many heat accumulating blocks having a water feeding passage in which two steel plates are overlapped from each other with a minute clearance being left between them and both side ends of the minute clearance are closed. SOLUTION: A plurality of heaters 4 fitted to and inserted into a heat accumulating member 10 are electrically energized, the heat accumulating member 10 is heated and heat is accumulated in it. The heat accumulating member 10 is provided with many thick steel plates 1. Each of the thick steel plates 1 has a section of rectangle shape, same shape and same size from each other and they are installed vertically. The two thick steel plates 1 are overlapped to each other with their long sides la having a rectangle section being oppositely faced to each other, the two thick steel plates 1 are welded at both right and left ends of the minute clearance S1 so as to form a heat accumulating block 2 having a water feeding passage 16 therein. A plurality of heat accumulating blocks (four to eight blocks) are closely contacted with each other in a forward or rearward direction, and their adjoining heat accumulating blocks 2 are welded at their lower end to constitute the row of blocks 6, thereby the two rows of blocks 6 are symmetrically arranged with the clearance S2 being spaced apart.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage type steam generator suitable for hot water supply.

[0002]

2. Description of the Related Art One example of a conventional heat storage type hot water supply device is shown in FIG. In FIG. 5, 01 is a heat storage tank, inside which a heat storage material 02 made of refractory brick is built in.
A plurality of heat medium flow paths 03 are formed in the.

During heat storage operation, the dampers 08 and 09 are opened, the dampers 010 and 011 are closed, the blower 06 is operated, and the blower 07 is stopped. Then, the air discharged from the blower 06 enters the heater 04 via the duct 014 as shown by the solid arrow, and is heated to a predetermined temperature by the heater 016 to which the midnight electric power 012 is supplied.

This high temperature air passes through a damper 09 and a heat storage tank 01.
The heat storage material 02 is heated in the process of flowing through the heat medium flow path 03 to cool the heat storage material 02 and flow out from the heat storage tank 01.
It is sucked into Blois 06 again through 08. By repeating the above, the temperature of the heat storage material 02 is gradually raised, and the heat storage operation is ended when the temperature of the air at the outlet of the heat storage tank 01 rises to the upper limit temperature.

During heat radiation operation, the dampers 010 and 011 are opened, the dampers 08 and 09 are closed, the blower 07 is operated, and the blower 06
To stop. Then, the air discharged from the blower 07 is
As indicated by a dashed arrow, the heat storage tank 01 enters the heat storage tank 01 through the duct 015 and the damper 010, and the heat is gradually absorbed by the heat storage material 02 while passing through the heat medium flow path 03. Then, it goes through the damper 011 and enters the radiator 05, where the coil 01
The water circulating in 3 is heated to lower the temperature and sucked into the blower 07 again, and the above is repeated.

[0006]

In the above conventional apparatus, since the refractory brick is used as the heat storage material 02, its heat storage density is low, and therefore the volume of the heat storage material 02 must be increased. Tank 01 is large and heavy.

Further, since it is provided with a duct 014, a blower 06, dampers 08, 09 for circulating air during heat storage operation, and a duct 015, a blower 07, dampers 010, 011 for circulating air during heat dissipation operation. The number of parts is large, and these parts are large in size because they handle air having a large specific volume. Moreover, since they are exposed to high temperature air, their life is short.

[0008]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and its gist is to store heat by heating a heat storage body by a heater during heat storage operation to release heat. In a heat storage type steam generator that injects water into the heat storage body to evaporate it during operation, the heat storage body is formed by stacking two steel plates on top of each other with a minute gap therebetween, and sealing both ends of the minute gap. It is a heat storage type steam generator characterized by comprising a large number of heat storage blocks having formed water injection paths.

Another feature is that a notch groove is formed over the entire length of the water injection channel in the central portion of the opposing surfaces of the two steel plates forming the water injection channel.

Still another feature is that the two steel plates have the same shape and size with a rectangular cross section, and the two steel plates are welded to each other at both ends of the gap.

Still another feature is that two block rows, in which a plurality of the heat storage blocks are arranged in close contact with each other, are arranged symmetrically with a gap therebetween, and the heater is provided in the gap in the front-rear direction. This is because a plurality of them are arranged at intervals.

Still another feature is that the two steel plates are erected substantially vertically, and a water injection pipe is connected to an upper end opening of the water injection passage and a steam pipe is connected to a lower end opening thereof. Especially.

However, when water is poured into the heat storage body during the heat radiation operation, the water flows in the process of flowing through the water filling passage of each heat storage block.
It evaporates by absorbing heat from a sheet of steel.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is shown in FIGS. 1 to 3, FIG. 1 is a horizontal sectional view of a heat storage body, FIG. 2 is a system diagram of a heat storage steam generator, and FIG. 3 is heat storage steam. It is a perspective view which fractures | ruptures and shows some generators.

When heat storage operation of the heat storage type steam generator is performed, as shown in FIG.
As shown in FIG. 3, a plurality of heaters 4 fitted in the heat storage body 10 are energized, and the heat storage body 10 is heated by the heaters 4 to raise the temperature to a predetermined temperature to store heat.

During the heat radiation operation, the water injection pump 14 is operated to extract the water stored in the water injection tank 13, and the water is injected into the heat storage body 10 through the water injection pipe 15. Then, this water is evaporated by removing heat from the heat storage body 10 in the process of flowing through the large number of water injection channels 16 formed in the heat storage body 10.

Then, the steam and the hot water pass through the steam pipe 12 and enter the steam pot 17 arranged below the heat storage body 10, where they are separated from the hot water, and the separated hot water is returned to the return pipe 18.
Return to the water injection tank 13 via.

The steam flowing out of the steam pot 17 enters the shell-and-tube heat exchanger 20 through the trachea 19, where it exchanges heat with the water flowing in the tube 20A to raise it to a predetermined temperature. As a result, the water condenses itself and returns to the water injection tank 13.

The hot water flowing out of the tube 20A is supplied to a customer (not shown) via a hot water supply pipe 21. If the amount of water in the water injection tank 13 decreases, open the on-off valve 22 and open the water injection tank.
Add water to the inside.

As shown in FIGS. 1 and 3, the heat storage body 10 is provided with a large number of thick steel plates 1, each thick steel plate 1 having a rectangular cross section and the same shape and size, and each substantially Is erected vertically.

As shown in FIG. 1, two thick steel plates 1 are superposed on each other so that the long sides 1a of a rectangular cross section face each other with a minute gap S ₁ (1 to 2 mm) therebetween, and then the minute plates 1 The heat storage block 2 having the water injection passage 16 is formed by welding 5 the two thick steel plates 1 to each other at both left and right ends of the gap S ₁ .

The heat storage block 2 constructed in this way
A plurality of (4 to 8) close to each other in the front-back direction,
A block row 6 is formed by welding adjacent heat storage blocks 2 to each other at their lower portions.

[0023] In this way two block rows 6 configured arranged symmetrically across a gap S _2, the mutually connecting these two block rows 6 through a connecting plate 7 in front and rear ends of the gap S ₂ By doing so, this gap S ₂ is closed.

A plurality of gaps (4 in the figure) are provided in the gap S ₂ .
Heaters 4 are inserted into each other at intervals in the front-rear direction, and the water injection pipes 16 are connected to the upper end openings of the many water injection passages 16 and the steam pipes 12 are connected to the lower end openings thereof. .

As shown in FIG. 3, the heat storage body 10 thus constructed is supported by the heat storage body legs 25, and a plurality of heat storage bodies (four in the drawing) are heat-insulated with or without separation in the left-right direction. Tank
Housed within 24. In FIG. 3, 26 is a heat insulating material,
27 is a heater booth bar, 28 is an auxiliary equipment room, 29 is a control panel, 30
Is a mixing tank.

A second embodiment of the invention is shown in FIG. In the second embodiment, a notch 9 reaching half the thickness of each of the facing surfaces 1a of the two steel plates 1 is provided over the entire length of the water injection channel 16. There is. Other configurations are similar to those of the first embodiment shown in FIGS. 1 to 3, and corresponding members are designated by the same reference numerals.

In the second embodiment, when the central portion of the steel sheet 1 bulges outward due to the facing surface 1a of the steel sheet 1 cooling earlier than the outer surface during heat radiation operation, the cut groove 9 causes The stress applied to the welded portion 5 can be reduced by relaxing the thermal strain. Further, since the heat exchange area for the fluid flowing through the water injection passage 16 is increased, the heat can be recovered in a short time.

However, if the apparatus of the above embodiment is compared with the conventional apparatus shown in FIG. 5, there are the following advantages. (1) Since the heat storage density of the steel plate heat storage body 10 is more than double that of the heat resistant brick, the volume of the heat storage body 10 is greatly reduced if the heat storage amount is the same.

(2) If the volume and the amount of heat storage of the steel sheet heat storage body 10 are the same, the heat storage temperature can be set low, so that the cost of the heat insulating material can be reduced. (3) The heat storage body 10 made of steel plate can be easily sealed. (4) Since the heat is taken out by using steam as a heat medium, its specific volume is smaller than that of air, and therefore the steam extraction system can be made small.

(5) Since ducts, blowers, dampers, etc. for circulating air during heat storage and heat dissipation operation are unnecessary,
The device can be miniaturized and its cost can be reduced. (6) During heat storage operation, there is no temperature limitation from the auxiliary equipment because the high temperature heat medium is not circulated. Therefore, the temperature of the heat storage body can be raised uniformly, and the heat storage density can be improved.

(7) Two steel plates 1 having the same shape and size and having a rectangular cross section are superposed on each other with a minute gap S ₁ therebetween and welded 5 at the left and right ends of the gap S ₁ to form a water injection channel. Since 16 are formed, the productivity of the heat storage block 2 is good, and since the production can be automated, it can be manufactured at low cost.

(8) Since the two steel plates 1 face the water injection channel 16 over the entire width in the left-right direction, the water injection channel 16 during heat dissipation operation
The heat exchange performance with the water flowing through the steel sheet is high, and since the temperature of the steel sheet is lowered uniformly by heating the water, the thermal deformation of the steel sheet 1 can be suppressed. (9) Since the steel sheet 1 is entirely facing the heater 4, the steel sheet 1 can be effectively heated by the heater 4 during the heat storage operation.

(10) Since the temperature difference between the surface of the steel plate 1 facing the heater 4 and the surface on the opposite side can be suppressed within 20 ° C., the thermal strain can be suppressed to a value without any problem. (11) Since the average temperature with respect to the maximum temperature of the steel sheet 1 can be set high, the amount of heat storage becomes large.

(12) Since the heat storage block 2 is only welded to the heat storage block 2 adjacent to the heat storage block 2 at its lower portion,
It can be freely expanded and contracted, and therefore stress fatigue due to the difference in expansion of the heat storage block 2 can be prevented. (13) If the water injection pipe 15 is connected to the upper opening of the water injection passage 16 and the steam pipe 12 is connected to the lower opening of the water injection passage 16, an equal amount of water can be passed through each of the water injection passages 16, and between the heat storage blocks 2. The thermal strain due to the temperature difference can be prevented.

(14) If the cut grooves 9 are formed in the central portions of the facing surfaces 1a of the two steel plates 1 over the entire length of the water injection passage 16,
Since the heat exchange area with the water flowing through the water injection channel 16 increases,
The heat can be recovered in a short time, and the thermal stress acting on the welded portion 5 of the steel sheet 1 can be suppressed. (15) Since the heater 4 is arranged in the gap S ₂ of the block row 6, it is easy to attach and detach it.

In the above embodiment, the steel plate 1 is erected substantially vertically, but it may be arranged horizontally or inclined. In addition, water is sprayed from above the heat storage body 10 without connecting the water injection pipes and the steam pipes to the water injection passages.
It can also flow into 16. Further, by inserting a spacer between the facing surfaces 1a and 1a of the two steel plates 1, the left and right ends of the minute gap S ₁ can be sealed.

[0037]

In the present invention, the heat storage body is provided with a large number of heat storage blocks each having a water injection passage formed by superposing two steel plates on each other with a minute gap therebetween and sealing both ends of the minute gap. Therefore, heat can be stored in the steel plate, and therefore the volume of the heat storage body can be reduced,
This can contribute to downsizing of the device and reduce its cost.

Further, since the two steel plates face the water injection channel over the entire width in the left-right direction, the heat exchange performance with the water flowing through the water injection channel during the heat radiation operation is high, and the water is heated. By doing so, the temperature is uniformly lowered over the entire width, so that the thermal deformation of the steel sheet can be suppressed.

If a notch groove is formed over the entire length of each of the central portions of the facing surfaces of the two steel plates, the heat exchange area with the water flowing through the water injection channel increases, so that heat can be generated in a short time. It can be recovered and the thermal stress acting on the welded part of the steel sheet can be suppressed.

If two steel plates having the same shape and size having a rectangular cross section are superposed on each other with a minute gap therebetween and welded to each other at both ends of the minute gap to form a water injection channel, the heat storage block is formed. Since the productivity is good and the production can be automated, it can be manufactured at low cost.

If two block rows in which a plurality of heat storage blocks are arranged in close contact with each other are arranged symmetrically with a gap between them, and a plurality of heaters are arranged in this gap with a gap in the front-rear direction, heat accumulation is achieved. The steel plate can be effectively heated by the heater during operation, and the heater is attached,
Easy to remove.

If two steel plates are erected substantially vertically, and a water injection pipe is connected to the upper opening of the water injection passage and a steam pipe is connected to the lower opening of the water injection passage, an equal amount of water is flowed to each water injection passage. Therefore, thermal strain due to the temperature difference between the heat storage blocks can be prevented.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view of a heat storage body according to a first embodiment of the present invention.

FIG. 2 is a system diagram of a heat storage type steam generator according to the embodiment.

FIG. 3 is a perspective view showing a heat storage type steam generator according to the above embodiment with a part thereof broken away.

FIG. 4 is a horizontal sectional view of a heat storage body according to a second embodiment of the present invention.

FIG. 5 is a system diagram of a conventional heat storage type hot water supply device.

[Explanation of symbols]

10 Heat storage body 1 Steel plate S ₁ Small gap 2 Heat storage block 5 Welded portion 6 Block row S ₂ Gap 4 Heater 7 Connecting plate

Front page continued (72) Inventor Koichiro Oyabu 2-47 Shiobara, Minami-ku, Fukuoka City Kyushu Electric Power Co., Inc. Research Institute (72) Inventor Masahisa Fujimoto 2-1-1 Shinhama, Arai-cho, Takasago, Hyogo Mitsubishi Heavy Industries Takasago Plant Co., Ltd. (72) Inventor Tadashi Tsuji 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture Mitsubishi Heavy Industries Ltd. Takasago Plant (72) Makoto Sogabe 2-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Takasago Works, Mitsubishi Heavy Industries, Ltd.

Claims (5)

[Claims] 1. In a heat storage type steam generator in which heat is stored by heating a heat storage body by a heater during a heat storage operation and water is poured into the heat storage body to evaporate during a heat radiation operation, the heat storage body comprises two steel plates. A heat storage type steam generating device comprising a large number of heat storage blocks each having a water injection passage formed by overlapping each other with a minute gap therebetween and sealing both side ends of the minute gap. 2. The heat storage system according to claim 1, wherein a cut groove extending over the entire length of the water injection channel is formed in each of the central portions of the facing surfaces of the two steel plates forming the water injection channel. Steam generator. 3. The steel sheet according to claim 1, wherein the two steel sheets have the same shape and size with a rectangular cross section, and the two steel sheets are welded to each other at both ends of the gap. Regenerative steam generator. 4. A plurality of said heat storage blocks are arranged in close contact with each other, and two block rows are arranged symmetrically with a gap therebetween, and a plurality of said heaters are arranged with a gap in the front-rear direction in this gap. The heat storage type steam generating device according to claim 1 or 2, characterized in that. 5. The two steel plates are erected substantially vertically, respectively, and a water injection pipe is connected to an upper end opening of the water injection passage and a steam pipe is connected to a lower end opening thereof. The heat storage type steam generator according to any one of 1 to 4.