KR100430212B1 - Heat Recovery Type Regenerating Apparatus - Google Patents

Abstract

An object of the present invention is to obtain a heat recovery type heat storage device which is compact in size and which has high reliability and high efficiency.

1. A heat recovery type heat storage device for transporting and regenerating an arrangement held by exhaust gas from a heat discharge device, comprising: a heat exchanger 6 provided in an exhaust duct 4 for discharging exhaust gas, and an inlet to the heat exchanger 6; A compressed gas source 1 connected via a pipe 7 and a jet 9 provided at an end of the outlet pipe 8 of the heat exchanger and accommodated in the liquid 12 contained in the bath 10. Then, gas is introduced into the heat exchanger 6 from the compressed gas source 1 and blown into the liquid 12 from the blowing section 9.

Description

Heat Recovery Type Regenerating Apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat recovery type heat storage device that recovers and regenerates an array of exhaust gases generated from a heat discharge device such as an electric furnace or an engine by heat treatment.

Conventionally, there is a heat recovery method using a partition wall type gas / gas heat exchanger, which is heated by sending air transferred by a blower to a secondary side (heat recovery side) of a heat exchanger installed in exhaust gas of high humidity, The heated air is used for heating, or a water / gas secondary heat exchanger is used to make hot water for hot water supply.

In addition, a heat pipe type heat exchanger is used as the heat exchanger to transfer the heat of the combustion gas to one end of the heat pipe, and to transfer the heat to the other end of the heat pipe to heat the surrounding water to raise the temperature to accumulate the heat. It is known.

In addition, it is described in Unexamined-Japanese-Patent No. 4-244590 for heat exchange using the direct contact of waste gas and liquid.

In the said prior art, in order to use for hot water supply, it is necessary to use a heat exchanger in two stages, and an apparatus becomes large. In addition, the temperature is lowered due to poor heat exchange efficiency due to the two-stage heat exchange. In addition, since the temperature of the water is changed to hot water while passing the water through the secondary side, the scale is attached to the inner wall of the water side of the heat exchanger to deteriorate the heat exchange efficiency, and the heat exchanger is overheated, burned out, and the water is opened. It may flow into this exhaust gas, and there is a possibility of causing a steam explosion.

In the case of using a heat pipe, when the temperature of the exhaust gas is high, there is a possibility that the pressure of the steam in the working medium in the heat pipe is increased and the heat pipe is pressure-broken.

In heat exchange using direct contact between the exhaust gas and the liquid, since the exhaust gas is directly ejected into the liquid in the tank, the liquid is contaminated by mist or impurities in the exhaust gas.

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat recovery type heat storage device in which the device is compact in size and high in reliability and efficient, while solving the problems of the prior art.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram which concerns on one Embodiment by this invention.

2 is a schematic diagram according to another embodiment according to the present invention.

3 is a schematic diagram according to still another embodiment according to the present invention.

4 is a schematic diagram according to still another embodiment according to the present invention.

5 is a schematic diagram according to still another embodiment according to the present invention.

6 is a schematic diagram according to still another embodiment according to the present invention.

7 is a schematic diagram according to still another embodiment according to the present invention.

8 is a schematic diagram according to still another embodiment according to the present invention.

9 is a schematic diagram according to still another embodiment according to the present invention.

10 is a schematic diagram according to still another embodiment according to the present invention.

11 is a schematic diagram according to still another embodiment according to the present invention.

12 is a schematic diagram according to still another embodiment according to the present invention.

Fig. 13 is a schematic diagram according to still another embodiment according to the present invention.

14 is a schematic diagram according to still another embodiment according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: compressed gas source

2: no

3: heat source

4: exhaust duct

5: exhaust gas

6: heat exchanger

7, 8: pipe

9: ejection part

10: Joe

11: cover

12: liquid

13: bubble

14: valve

15: pressure gauge

16: suction pipe

17: insulation

18: casing

30, 30-a: inner wall

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a heat recovery type heat storage device for transporting and regenerating an arrangement held by exhaust gas from a heat discharge device, the heat exchanger provided in an exhaust duct for discharging the exhaust gas, and the heat exchanger. A compressed gas source connected to an inlet pipe via an inlet pipe, and an ejection portion provided at an end of an outlet pipe of the heat exchanger and housed in a liquid contained in a tank, and the gas is supplied from the compressed gas source to the heat exchanger. Is introduced into the liquid from the jetting section.

Moreover, in the above, it is preferable to provide the nozzle which has a small hole in a blowing part.

Moreover, it is preferable to provide a negative pressure part by the flow of the gas which flows through a blowing part in the above, and to provide a suction pipe in the said negative pressure part.

Moreover, it is preferable to provide the inner wall which provided the lower hole and the upper hole inside the tank in the above, and introduce the gas which blows off from a blowing part in the liquid between the wall of the said tank and the said inner wall.

In addition, the present invention relates to a heat recovery type heat storage device that stores heat using heat in an exhaust duct, comprising: a heat exchanger provided in the exhaust duct, a compressed gas source connected to the heat exchanger via an inlet pipe, and the heat exchanger. It is provided at the end of an outlet pipe, and has a blower provided near the upper part of the liquid accommodated in the tank, introduces a gas from the said compressed gas source to the heat exchanger, and injects the said gas blown out from the blower to the said liquid. It is.

Moreover, in the above, it is preferable to drive the stirrer provided in the said liquid by the compressed air from the compressed gas source, and to agitate the liquid.

Moreover, in the above, it is preferable that the compressed gas from a compressed gas source is a gas or steam containing superheated steam or mist.

In addition, the present invention provides a heat recovery type heat storage apparatus using an arrangement held by exhaust gas, wherein a heat exchanger is provided in an exhaust duct for discharging the exhaust gas, and gas is introduced into the heat exchanger to increase the temperature. The heat of heat is accumulated and supplied to the heat utilization facility.

One embodiment of the present invention is shown in FIG. 1, and the furnace 2 which houses a heat source (combustion heat or the like) 3 has an exhaust duct 4, and exhaust gas ( 5) is being discharged. The exhaust gas 5 has a large arrangement, and its recovery is important.

In Fig. 1, a heat exchanger 6 is provided in the exhaust duct 4, and a heat medium is introduced into the heat exchanger 6. As the heat medium, it is preferable to introduce gas (air or the like) from the compressed gas source 1 via the pipe 7. The gas introduced into the heat exchanger 6 receives the heat of the exhaust gas 5 from the outer surface of the heat exchanger 6 and heats it up, and then passes through the pipe 8 to the inside of the tank 10 from the jet 9. Blow into the liquid (12). The bubble 13 thus generated moves to the upper portion of the liquid 12 by buoyancy and is discharged to the outside from the gap between the lid 11 and the tank 10. When the bubble 13 floats in the liquid 12, the heat retained by the bubble 13 is applied to the liquid 12. The heated liquid 12 is transported to the outside using a pump or the like and used as hot water supply, heating or washing water.

According to this example, since liquid (water) does not flow in the heat exchanger 6, there is no generation of scale, and therefore, deterioration of heat transfer efficiency does not occur. In addition, water leakage from the heat exchanger 6 is not caused to flow into the exhaust duct 4. In addition, the metallic heat exchanger is only code | symbol 6, and is not necessary other than that. Moreover, the liquid 12 can be heated up only by blowing a gas into the liquid (water) 12 of the tank 10, and also it becomes easy to accumulate heat.

FIG. 2 shows the configuration of the tank 10 of FIG. 1, and in particular, the heat transfer method in the tank 10 is different from that of the tank of FIG. 1 by bending the ejection part 9 of the pipe 8 to the liquid 12. It is made to spray on the liquid level. The liquid level is waved and shakes to increase the surface area, which promotes heat transfer. Compared to the method of generating the bubbles 13 in the liquid 12 of FIG. 1, the amount of blowout of the gas from the pipe 8 can be increased.

FIG. 3 shows yet another embodiment, in which the bent jetting portion 9 is slightly immersed in the liquid level of the liquid 12, which can combine the effects of FIGS.

Fig. 4 shows yet another embodiment, arranges a manifold as the ejecting portion 9 horizontally at the end of the pipe 8, and provides a plurality of small holes 9-a in the manifold, The gas heated up from this small hole 9-a is blown toward the liquid level of the liquid 12. The manifold jet 9 may be in an annular shape. By forming a plurality of ejection holes from the manifold ejecting portion 9, the contact area between the liquid surface and the gas to eject is increased and heat transfer is promoted, and the liquid 12 rises to a desired temperature in a short time.

FIG. 5 shows yet another embodiment, and in particular, shows an enlarged heat transfer method in the tank 10. This branched to the ejection part 9, provided with the suction pipe 16, and immersed this opening edge part 16-a in the liquid 12. As shown in FIG. When gas is blown out from the opening end 16-a of the blowing part 9, the contact part of the suction pipe 16 and the blowing part 9 will become a negative pressure, and the liquid 12 will suck in from the opening end 16-a. do. That is, a part of the liquid 12 mixes in the hot gas in the blowing section 9, becomes a mist, and is ejected from the end of the blowing section 9. In other words, the mist of the liquid 12 and the hot gas are efficiently transferred by direct contact and ejected from the injection section 9, and also collide with the liquid surface of the liquid 12 to conduct heat transfer, and the liquid 12 is affected by both effects. This increases the temperature. In addition, the liquid 12 tends to cause convection in the tank 10.

Fig. 6 shows yet another embodiment, in which the jetting portion 9 of Fig. 5 is immersed in the liquid 12, and the gas ejected from the blowing portion 9 becomes a bubble 13 and the liquid 12 It is ejected in). The synergistic effect of the suction effect of the liquid 12 from the opening end 16-a and the spraying effect of the bubble 13 from the end of the ejecting portion 9 increases the temperature raising effect of the liquid 12.

FIG. 7 shows yet another embodiment, in which the jetting portion 9 is horizontally attached to the lower end of the pipe 8 directly immersed in the liquid 12 and the small hole 9 of the jetting portion 9. The bubble 13 is ejected into the liquid 12 from -a). The heat insulating material 17 is wound up and insulated in the part which the pipe 8 and the blower part 9 contact in the liquid 12. As a result, heat is transferred to the liquid 12 through the walls of the pipe 8 and the blowing section 9, so that a temperature boundary layer is generated in the wall, the gas is lowered in temperature, and bubbles 13 are released from the small holes 9-a. In this case, the temperature is lowered at the time of jetting, and the heat exchange ability of the bubble 13 and the liquid 12 can be prevented from being lowered.

FIG. 8 shows yet another embodiment, in which the pipe 8 is arranged horizontally, connecting a horizontal sprayer 9 to the pipe 8, and from the side of the bath 10 as shown. Is to be inserted into the liquid 12. The heat insulating material 17 is wound in the blowing part 9 so that the small hole 9-a may be avoided. Moreover, the side plate of the upper cover 11 of the tank 10 is bent downward so that the side surface of the tank 10 may be comprised, and the duct 11-a is comprised. As a result, when the gas that has risen in the liquid 12 enters the duct 11-a from the upper portion of the lid 11, the wall of the tank 10 is warmed by contact with the tank 10 to the outside air. The heat dissipation loss can be reduced.

Fig. 9 shows another embodiment, in which a casing 18 is installed in the middle of the pipe 7 through which gas passes, a blade 19 is installed therein, and the blade 19 is sprayed with gas to rotate. After passing through the shaft 20 to the stirrer 21 attached to the lower portion thereof, the liquid 12 is stirred. Due to the synergistic effect of the stirring effect of the liquid 12 and the shaking effect of the bubbles 13 ejected from the ejecting part 9, the liquid 12 is well stirred, and the heat retained by the gas is transferred to the liquid 12. It is transmitted and the temperature raising effect becomes high.

Fig. 10 shows yet another embodiment, in which a blade 19 having a casing 18 is provided in the rear pipe part 8 of the heat exchanger 6. The new renovation work has the advantage of being finished with pipes 8 arranged around and near the tank 10.

Fig. 11 shows another embodiment, in which the inner wall 30 is vertically arranged near the side wall inside the tank 10, and the lower hole 31 and the upper hole 32 are disposed in the lower portion thereof. It is prepared. A blowing section 9 connected to the pipe 8 is provided below the liquid 12-a existing between the side walls of the inner wall 30, and the bubbles 13 are blown into the liquid 12. The liquid 12-a rises in its liquid position due to the mixing of bubbles 13, and the liquid 12-a heated up by heat exchange overflows from the upper hole 32 in the upper portion, and the space 12 on the opposite side 12 Out). On the other hand, the liquid 12 enters the small space 12-a from the lower hole and reaches near the ejection portion 9 to repeat the same cycle. The position and size of the upper hole 32 provided above the inner wall 30 are preferably determined by the density of the liquid 12 and the flow rate of the gas ejected from the ejecting portion 9. Thereby, in the longitudinally long heat transfer space constituted by the tank 10 and the inner wall 3D, the liquid 12-a and the bubble 13 are sufficiently heat-exchanged and the temperature becomes high.

Fig. 12 shows another embodiment, in which two inner walls 30, 30-a are provided inside the tank 10, and ejecting portions 9, 9-a are provided in each small space. . Lower holes 31 and 31-a are provided below the inner walls 30 and 30-a, and upper holes 32 and 32-a are provided above. In addition, if necessary, the upper walls 33 and 33-a may be provided on the upper portions of the inner walls 30 and 30-a to alleviate the jumping of the bubbles 13 and the liquid 12-a. In addition, the inner walls 30 and 30-a may be provided as an inner cylinder and may be disposed in an annular shape inside the tank 10.

FIG. 13 shows yet another embodiment of the ejecting portion 9 of FIG. 1, in which an underwater nozzle 40 having a plurality of small holes 41 is provided at the end of the outlet pipe 8. As a result, the small bubbles 13 are ejected and dispersed in the plurality of liquids 12, and the heat exchangeability is improved.

Fig. 14 shows yet another embodiment of the ejecting portion 9 of Fig. 1, in which a pump 42 is provided to introduce the liquid 12 in the tank 10 by the suction pipe 16 to discharge the pipe ( Inject | pours into the blowing part 9 from the injection pipe 44 which passes through 43. FIG. The atomized liquid 12 is more scattered into the hot gas than the injection pipe 44 to improve heat exchangeability.

As described above, a gas / gas heat exchanger is provided in the exhaust gas, but compressed air (such as using a compressed air source for a factory) is introduced into the heat exchange passage on the secondary side (heat recovery side) to heat exchange. The heat exchange efficiency is good because the temperature of the liquid is increased by directly heating the hot air into the liquid (water, etc.) and exchanging the heat, and there is no fear of burning of the heat exchanger, steam explosion, pressure breakdown, etc. Neither impurity can contaminate liquids.

In the above example, the gas is advantageous in terms of costs, such as not only air and nitrogen, but also superheated steam generated from the boiler, steam containing minute liquid particles (mist), and steam reheated in the drain of the boiler. Sun is preferred. In addition, the gas is preferably used in terms of efficiency and cost by using a gas having a residual pressure after being used for rotation of the machine tool once. In addition, in the tank 10, it is preferable in terms of improving the efficiency by filling the heat storage container of the latent heat storage type by increasing the heat storage capacity.

As described above, according to the present invention, since the gas is introduced into the heat exchanger in the exhaust duct, the temperature is increased, and the heat of the heated gas is accumulated and made available, so that the apparatus is compact and highly reliable and has high efficiency. A heat recovery type heat storage device can be obtained.

Claims (8)

A heat recovery type heat storage device for transporting and regenerating an arrangement held by exhaust gas from a heat discharge device, A heat exchanger installed in an exhaust duct for discharging the exhaust gas; A source of compressed gas connected to said heat exchanger via an inlet pipe, It is provided at the end of the outlet pipe of the heat exchanger, and provided with a blower contained in the liquid contained in the tank, the gas is introduced into the heat exchanger from the compressed gas source and blown into the liquid from the blower Heat recovery heat storage device. The heat recovery type heat storage device according to claim 1, wherein a nozzle having a small hole is provided in the blowing section. The heat recovery type heat storage device according to claim 1, wherein a negative pressure unit is provided by a flow of gas passing through the blowing unit, and a suction pipe is provided in the negative pressure unit. The heat recovery type heat storage device according to claim 1, wherein an inner wall provided with a lower hole and an upper hole is provided inside the tank, and a gas that is ejected from the ejecting portion is introduced into the liquid between the wall of the tank and the inner wall. . In the heat recovery type heat storage device that accumulates using heat in the exhaust duct, A heat exchanger installed in the exhaust duct, A source of compressed gas connected to said heat exchanger via an inlet pipe, The gas is provided at the end of the outlet pipe of the heat exchanger and is provided near the upper portion of the liquid contained in the tank, the gas is introduced into the heat exchanger from the compressed gas source, and the gas is ejected from the spray part. A heat recovery type heat storage device, characterized in that the spray to the liquid. The heat recovery type heat storage device according to claim 1 or 5, wherein the liquid is agitated by driving a stirrer provided in the liquid by compressed air from the compressed gas source. The heat recovery heat storage device according to claim 1 or 5, wherein the compressed gas from the compressed gas source is a gas or steam containing superheated steam or mist. A heat recovery type heat storage device using an arrangement held by exhaust gas, And a heat exchanger is installed in the exhaust duct for discharging the exhaust gas, the gas is introduced into the heat exchanger to increase the temperature, and the heat of the heated gas is accumulated and supplied to a heat utilization facility.