KR100790016B1 - Waste heat recovery system - Google Patents

Abstract

Waste heat recovery apparatus according to the present invention for achieving the above object is a collection tank for recovering high temperature waste water, and an intake tank in which waste water flows from the collection tank and a low temperature fluid flows therein, and the inside of the intake tank. Installed on the scale to prevent the scale from being formed between the wastewater introduced into the water tank and the heat exchange unit, a drain line installed in the water tank to drain the waste water, a temperature sensor installed on the drain line, and Since it includes a drain line and a recovery line branched from the drain line and a recovery valve installed in the recovery line and opened in accordance with the temperature of the drained waste water, the scale is prevented from occurring due to the vortex generated between the intake tank and the heat exchange unit. There is an advantage.

Description

Waste heat recovery apparatus

1 is a view showing a waste heat recovery apparatus according to the present invention,

Figure 2 is a cross-sectional view A-A of Figure 1 in the waste heat recovery apparatus according to the present invention,

3 is a view showing a heat exchanger of the waste heat recovery apparatus according to the present invention;

4 is a view showing the operation of the waste heat recovery apparatus according to the present invention.

<Brief Description of Major Codes in Drawings>

100: waste heat recovery device 110: water tank

111: inlet 113: outlet

115: re-entry entrance 120: acquisition tank

121: inlet line 123a: drain line]

123b: drain line 125: temperature sensor

126: discharge valve 127: recovery line

129: foreign matter remover 130: heat exchanger

140: scale generation prevention means 141: rib

143: drive unit 145: rotation axis

147: Vortex generator 150: overflow tank

151: overflow hole 153: return line

155 cover 157 recovery valve

The present invention relates to a waste heat recovery apparatus, and more particularly, to a waste heat recovery apparatus that recovers heat from high temperature wastewater and suppresses scale generated by the wastewater.

In general, high-temperature wastewater is discharged from public baths where a large amount of hot water is used, factories where hot water is used for industrial use, and residential areas where living water is used. Since it is not preferable in terms of efficient use of energy, it is not desirable to discharge heat contained in the waste water to the outside without recovering it. Therefore, various waste heat recovery apparatuses for recovering heat contained in the waste water and reusing it for heating of hot water are used.

For example, in public baths, the cold water used in the public baths is supplied with cold water or a hot water directly from the water tank to the cold bath or shower through a cold water supply line.In the case of hot water, the hot water from the rooftop tank is fossil fuel or electric energy. It is heated to a predetermined temperature by various boilers using and stored in a hot water tank, and if necessary, it is supplied to the hot water or shower of a bathroom through a hot water supply line, so that a bather can take a bath by mixing cold water and hot water at an appropriate temperature. Equipped to ensure

Waste water in the bathroom drained after the user uses at least 30 ℃ heat by the temperature of the hot water can be recovered and reused.

Waste heat recovery system used in hot water facilities is a heat exchange system applied to hot water heating and waste water heat recovery using a refrigeration cycle consisting of a compressor, a condenser, an expansion valve, and an evaporator. Wastewater can be made by heat exchange with low temperature fluid.

That is, such a waste heat recovery device is installed on the inner surface of the water tank in which the high temperature wastewater is introduced, and a heat exchange coil or fin through which low temperature fluid circulates to recover heat from the wastewater.

However, the conventional waste heat recovery apparatus has a problem in that the waste water is stuck to the inner surface of the heat exchange coil or the tank to form scale as the waste water is introduced into the tank.

In addition, when the scale is generated, there is a problem that the trouble of frequently cleaning the inside of the water tank and the heat exchange coil is caused.

In addition, when the chemical is used in the process of cleaning the scale, the life of the heat exchange coil or the water tank is shortened, and the amount of heat recovery is reduced.

The present invention has been made to solve the above problems, an object of the present invention is to provide a waste heat recovery apparatus that can prevent the generation of scale in the heat exchange process.

Waste heat recovery apparatus according to the present invention for achieving the above object is a collection tank for recovering high temperature waste water, and an intake tank in which waste water flows from the collection tank and a low temperature fluid flows therein, and the inside of the intake tank. Installed on the scale to prevent the scale from being formed between the wastewater introduced into the water tank and the heat exchange unit, a drain line installed in the water tank to drain the waste water, a temperature sensor installed on the drain line, and And a drainage line branched from the drain line, a recovery line, and a recovery valve installed in the recovery line and opened according to the temperature of the drained wastewater.

The scale generation preventing means is formed to protrude to the inner surface of the water tank so that the heat generating unit and the vortex generating unit and the inner surface of the water tank is rotated by the drive unit and positioned in the center of the water tank is spaced apart It is preferable to include a plurality of ribs in which the heat exchange part can be installed.

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If the temperature of the wastewater detected by the temperature sensor is 10 ℃ or more, it is preferable to open the recovery valve.

The recovery line is preferably connected to the sump.
In addition, the waste heat recovery apparatus according to the present invention for achieving the above object is a collection tank in which high temperature wastewater is recovered, an intake tank in which waste water is introduced from the collection tank and a low-temperature fluid flows inside the collection tank, Scale generation preventing means installed inside and preventing the scale from being formed between the waste water introduced into the water tank and the heat exchange unit, an overflow hole formed on the upper side of the water tank, the overflow tank surrounding the upper side of the water tank and the And a return line formed underneath the overflow tank.

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Hereinafter, the waste heat recovery apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a waste heat recovery apparatus according to the present invention, Figure 2 is a cross-sectional view AA of Figure 1 in the waste heat recovery apparatus according to the present invention, Figure 3 is a view showing a heat exchange unit of the waste heat recovery apparatus according to the present invention. to be. 4 is a view showing the operation of the waste heat recovery apparatus according to the present invention.

Referring to these drawings, the waste heat recovery apparatus is installed in the water collecting tank 110 where the high temperature wastewater is recovered, the water collecting tank 120 where the waste water flows from the water collecting tank 110, and heat exchange occurs, and the high temperature is installed in the water collecting tank 120. The heat exchange unit 130 is a low-temperature fluid flows to exchange heat with the waste water and the scale generation preventing means is installed in the intake tank 120 to prevent the scale is generated in the intake tank 120 and the heat exchange unit 130 And 140.

Referring to FIG. 1, the water collecting tank 110 has an inlet 111 through which hot waste water is introduced, an outlet 113 for drawing out wastewater introduced into the water collecting tank 110, and an intake tank 120. ), A re-entry port 115 for re-introducing wastewater is provided.

The intake tank 120 is connected to the inlet 113 of the collecting tank 110, the inlet line 121 for introducing waste water, and the drain line 123a for the heat exchanged waste water is drawn out of the intake tank 120 Is installed. In addition, the heat exchanger 130 and the scale generation preventing means 140 is installed inside the acquisition tank 120. Here, the inlet line 121 of the inlet pump 117 for introducing the wastewater from the collecting tank 110 to the inlet tank 120 is of course installed.

Scale generation preventing means 140 is provided with a plurality of ribs 141 protruding on the inner surface of the inlet tank 120, the vortex generating unit 147 is installed in the center of the inlet tank 120 to generate vortices in the waste water and , A driving unit 143 for rotating the vortex generating unit 147, and a rotation shaft 145 connecting the vortex generating unit 147 and the driving unit 143.

Vortex generator 147 is a plurality of blades, so that the flow of water is vortex while rotating by the drive unit 143.

At this time, the heat exchanger 130 is, in one embodiment, preferably in the form of a coil having a low temperature fluid flowing therein, as shown in Figure 2, is installed in the rib 141 of the intake tank 120 . Therefore, the heat exchanger 130 and the inner surface of the water tank 130 are spaced apart, and the vortex is generated by the vortex generator 147 in the space between the heat exchanger 130 and the rib 141.

In addition, the heat exchanger 130, as shown in Figure 3, the fluid flowing through the coil may be a refrigerant or cold water, the coil is a fluid inlet 131 through which the fluid of low temperature flows into the coil and the fluid heated by heat exchange The fluid outlet 133 is drawn out of the water tank 120 is provided. In addition, the fluid inlet 131 is preferably provided with a pressure reducing valve 135 for adjusting the pressure of the fluid introduced into the coil.

Although not shown in the figure, the heat exchange part 130 may be fin-shaped.

The temperature detection sensor 125 is installed in the drain line 123a provided below the water tank 120. In addition, when the temperature detected by the temperature sensor 125 is higher than the predetermined temperature, the recovery line 127 connected to the re-entry port 115 so as to be recovered to the water collecting tank 110 and the drain line discharged when the temperature is lower than the predetermined temperature. 123b is installed. At this time, the recovery valve 157 installed in the recovery line 127 is opened when the temperature of the waste water is higher than 10 ° C so that the waste water is recovered back to the recovery line 127 and heat exchanged again.

Here, the foreign matter remover 129 is provided in the drain line 123b so that foreign matters such as sand residues contained in the wastewater discharged to the drain line 123a can be separated and discharged from the wastewater. Wastewater from which foreign substances are removed while passing through the foreign substance remover 129 is discharged to the outside through the discharge valve 126.

On the other hand, a plurality of overflow holes 151 are formed on the upper side of the intake tank 120, covered by the cover 155, the overflow tank 150 is formed to surround the upper side of the intake tank 120. . When the vortex is generated in the wastewater by the vortex generating unit 147, the suspended matter contained in the wastewater flows into the overflow tank 150 through the overflow hole 15. In addition, the overflow tank 150 is provided with a return line 153, and the return line 153 is provided with a temperature sensor (not shown) as in the drain line 123a and is higher than 10 ° C. It is preferable to recover to 110.

Hereinafter will be described in detail the operation and action of the waste heat recovery apparatus of the present invention.

First, high temperature wastewater is introduced into the sump 110 through the inlet 111. (S200)

Waste water introduced into the sump 110 is pumped by the inlet pump 117 is moved to the inlet 120 through the inlet line 121 (S210).

When the wastewater enters the intake tank 120, vortices are generated in the wastewater by the scale generation preventing means 140. In detail, when the driving unit 143 is driven, the blade-type vortex generating unit 147 connected to the rotating shaft 145 rotates to generate vortices in the wastewater. At this time, the coil-type heat exchanger 130 through which the low-temperature fluid flows generates vortices between the heat exchanger 130 and the inner surface of the water tank 121 by a plurality of ribs 141 installed on the inner surface of the water tank 120. Let's do it. Therefore, the generation tank 120 or the heat exchanger 130 is suppressed generation of scale due to the residue contained in the waste water (S220).

Next, the high temperature wastewater in which the vortex is generated is in contact with the heat exchanger 130 to be heat exchanged. That is, the temperature of the wastewater raises the temperature of the low temperature fluid flowing through the heat exchange unit 130. Thus, when the low temperature fluid flowing through the heat exchanger 130 is a refrigerant, the refrigerant of the heat exchanger 130 may be reused to heat the hot water again, and in the case of cold water, may be used again when heated to a constant temperature. S230)

On the other hand, the waste water that has been heat exchanged in the intake tank 120 is discharged to the outside of the intake tank 120 through the drain line 123a. (S240a)

In addition, when the wastewater of the water tank 120 overflows the overflow water tank 150 through the overflow hole 151 formed above the water tank 120, the waste water is drained through the return line 153. (S240b)

At this time, when the temperature detected by the temperature sensor 125 is 10 ° C. or more, the waste water drained from the inflow tank 120 may return the recovery valve 157 installed in the recovery line 127 to recover the remaining heat. The waste water is introduced into the branched recovery line 127 by opening.

In addition, the wastewater drained from the overflow tank 150 is also re-introduced into the collection tank 110 and the acquisition tank 120 through the return line 153. (S250)

On the other hand, when the temperature of the wastewater detected by the temperature sensor 125 is less than 10 ° C, the recovery valve 157 is not opened, so the wastewater and the residue are separated and discharged. Here, foreign matters such as sand and debris of the wastewater discharged to the drain line 123a may be removed through the foreign material remover 129 via the drain line 123b and then discharged to the outside. Wastewater and dregs overflowed through the above-described overflow hole 151 is also preferably discharged through the above process.

What has been described above is only one embodiment for carrying out the present invention, and the present invention is not limited to the above-described embodiment, and the present invention is made without departing from the gist of the present invention as claimed in the following claims. Anyone with ordinary knowledge in this field will have the technical idea of the present invention to the extent that various modifications can be made.

According to the present invention, since the waste heat recovery apparatus of the present invention is provided with a scale generation preventing means, the scale is prevented from being generated by the vortex generated between the water tank and the heat exchange unit.

In addition, the vortex generated by the vortex generating unit has an advantage of increasing the heat recovery efficiency of the heat exchange unit and the waste water because it increases the number of times.

Claims (6)

A sump collecting hot waste water; An intake tank in which wastewater is introduced from the sump and a low-temperature fluid flows therein; A scale generation preventing means installed in the water collecting tank and preventing a scale from being formed between the wastewater introduced into the water collecting tank and the heat exchange unit; A drain line installed in the water tank to drain waste water; A temperature sensor installed at the drain line; A drain line and a recovery line branched from the drain line; And And a recovery valve installed in the recovery line and opened according to the temperature of the drained wastewater. The method according to claim 1, The scale generation preventing means includes a drive unit; A vortex generating unit rotated by the driving unit and positioned in the center of the water collecting tank; And And a plurality of ribs formed to protrude on an inner surface of the inlet tank so that the inner surface of the inlet tank and the heat exchanger part are spaced apart from each other so that the heat exchanger unit can be installed on a front surface thereof. delete The method according to claim 1, The waste heat recovery apparatus, characterized in that for opening the recovery valve, if the temperature of the waste water detected by the temperature sensor is more than 10 ℃. The method according to claim 1, The recovery line is waste heat recovery apparatus, characterized in that connected to the sump. A sump collecting hot waste water; An intake tank in which wastewater is introduced from the sump and a low-temperature fluid flows therein; A scale generation preventing means installed in the water collecting tank and preventing a scale from being formed between the wastewater introduced into the water collecting tank and the heat exchange unit; An overflow hole formed at an upper side of the water tank; An overflow tank surrounding the upper side of the water tank; And Waste heat recovery apparatus comprising a return line formed on the lower side of the overflow tank.

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