KR101325897B1 - Apparatus for recovering heat of wasted water - Google Patents

Abstract

The present invention relates to an apparatus for recovering waste heat from sewage, which effectively performs a cooling and heating process and/or a hot water supply process for a demander with the waste heat generated in a sewage treatment plant using at least one heat exchanger and a heat pump. The apparatus according to the present invention comprises: at least one waste heat exchanger performing heat-exchange with the waste heat generated in the sewage treatment plant; the heat pump connected to the waste heat exchanger through a primary heat exchange medium circulation line; a loading unit connected to the heat pump through a secondary heat exchange medium circulation line; and a buffer tank performing the cold storage or the thermal storage process of a secondary heat exchange medium cooled or heated by the heat pump with being installed at the middle of the secondary heat exchange medium circulation line, wherein the secondary heat exchange medium circulation line comprises a feeding pipe feeding the secondary heat exchange medium from the heat pump to the loading unit and a recovering pipe recovering the secondary heat exchange medium from the loading unit to the heat pump; the buffer tank is connected to be able to communicate with the middle of the feeding pipe; a recovering pipe for buffer is connected to branch off from the point of one side of the recovering pipe; a switching valve is installed at a portion in which the recovering pipe for buffer branches off from the recovering pipe; and the end portion of the recovering pipe for buffer is connected to the buffer tank.

Description

Sewage waste heat recovery system {APPARATUS FOR RECOVERING HEAT OF WASTED WATER}

The present invention relates to a sewage waste heat recovery apparatus, and more particularly, to recover sewage waste heat that can effectively perform cooling and heating and / or hot water supply to a demand by using one or more heat exchangers and heat pumps. Relates to a device.

The demand for water is increasing rapidly due to the rapid industrialization and urbanization caused by economic development, but the lack of water due to the lack of water resources and water pollution caused by the use of water is intensifying. As they are discharged, water recycling and pollution prevention measures have emerged as important social and economic issues.

In addition, in the present situation where there is energy turbulence around the world due to the increase in electric power demand, the waste heat of sewage water discharged indiscriminately can contribute to the energy saving.

In recent years, a sewage waste heat recovery system has been developed to recover wastewater generated from a sewage treatment plant and supply it to various demand sources, and the wastewater heat recovered by the wastewater waste heat recovery system is efficiently used for heating and cooling or hot water supply at each demand source. Can contribute.

On the other hand, in the wastewater discharged from industrial complexes such as dyeing complexes among sewage treatment plants, the temperature of the wastewater (ie, the wastewater of the intermediate treatment process) that has undergone pretreatment, such as sedimentation tank, is relatively high (approximately 40 ~ 50 ℃). In the case of about 20 ~ 30 ℃), in order to treat such waste water in the reaction tank or the like to be cooled to a temperature suitable for treatment, for example about 10 ~ 30 ℃. In order to cool the sewage water to a temperature suitable for treatment, a separate cooling device is installed between the settling tank and the reaction tank, and it is configured to cool the wastewater to the temperature of the sewage transferred from the settling tank to the reaction tank to 10 to 30 ° C. .

Accordingly, the conventional sewage treatment plant has a disadvantage in that the waste of energy for driving the cooling apparatus is increased while increasing the installation cost of the cooling apparatus, and the waste heat of the sewage is not properly recycled.

In addition, the conventional sewage heat recovery system purifies the sewage collected in the sewage treatment plant in advance, and utilizes only the waste heat of the purified sewage as a heat source, and sewage, unpurified sewage, and reused water (wash water) of other intermediate treatment processes. , Parcel water, landscaping water, hydrophilic water, etc.) as a heat source, there was a disadvantage that the utilization of sewage was not efficient.

The present invention has been made in order to solve the various disadvantages of the prior art as described above, by efficiently recovering the wastewater wastewater before flowing into the reactor in the sewage treatment plant can be efficiently cooled to a temperature suitable for the sewage treatment in the reaction tank, through which The purpose of the present invention is to provide a sewage waste heat recovery device, which does not require a separate cooling device for cooling sewage, thereby greatly reducing energy waste and also greatly reducing the cost of equipment.

In addition, the present invention provides a sewage waste heat recovery apparatus that can reduce the overall energy and improve the thermal efficiency by installing a buffer tank that can accumulate heating or cooling heat between the heat pump and the heating and cooling mechanism (or hot water supply equipment). Its purpose is to.

Sewage waste heat recovery apparatus according to the present invention for achieving the above object, one or more waste heat heat exchanger configured to heat exchange with the sewage waste heat generated in the sewage treatment plant, and heat connected to the waste heat heat exchanger through a primary side heat exchange medium circulation line A pump, a load mechanism connected to the heat pump through a secondary heat exchange medium circulation line, and a secondary coolant or heat storage function installed in the middle of the secondary heat exchange medium circulation line and cooled or heated by the heat pump. A buffer tank to carry out,

The secondary heat exchange medium circulation line includes a supply pipe for supplying the secondary heat exchange medium from the heat pump to the load mechanism, and a recovery pipe for recovering the secondary heat exchange medium from the load mechanism to the heat pump.

The buffer tank is connected in communication with the middle of the supply pipe, and a buffer recovery pipe is branched at one point of the recovery pipe, and a switching valve is installed at a portion where the recovery pipe and the buffer recovery pipe are branched. An end of the recovery pipe for the buffer is characterized in that connected to the buffer tank.

The buffer tank is characterized in that the temperature sensing unit for detecting the internal temperature of the buffer tank in real time.

The sewage circulation line is connected to a recycled water line, and the recycled water is configured to circulate through the sewage circulation line, and the sewage circulation line is branched at a branch point of the recycled water line and passes through the waste heat heat exchanger before the confluence point of the recycled water line. It is characterized in that connected to join.

The waste heat heat exchanger comprises a first waste heat heat exchanger and a second waste heat heat exchanger connected in parallel between the sewage circulation line and the primary heat exchange medium circulation line.

The sewage circulation line circulates the first sewage supply pipe and the first sewage discharge pipe connected to circulate the sewage during the intermediate treatment process of the sewage treatment line to the first waste heat exchanger side, and reused water passing through the reuse line to the second waste heat heat exchanger side. And a second sewage supply pipe and a second sewage discharge pipe connected to each other.

The load mechanism is characterized in that it comprises one or more air-conditioning mechanism for performing the heating or cooling operation while the heat medium passes.

The load mechanism is characterized in that it further comprises a hot water tank.

According to the present invention, by properly recovering the waste heat from the sewage treatment plant before it is introduced into the reactor, the reactor can be efficiently cooled to a temperature suitable for sewage treatment in the reactor, thereby eliminating the need for a separate cooling device for cooling the sewage. The waste can be greatly reduced, and the cost of the equipment is greatly reduced by minimizing the pipe length between the supply source and the supply source, and the energy efficiency can be greatly improved.

In addition, the present invention can utilize various types of sewage as a heat source, such as not only purified sewage but also unpurified sewage, intermediate sewage, recycled water (wash water, parcel water, landscaping water, hydrophilic water, etc.), Through this, there is an advantage that can greatly improve the utilization of sewage and the efficiency of sewage heat recovery.

1 is a conceptual diagram schematically showing a state in which the sewage waste heat recovery apparatus according to the present invention is applied to a sewage treatment plant.
2 is a block diagram showing a wastewater waste heat recovery apparatus according to a first embodiment of the present invention.
3 is a block diagram showing a wastewater waste heat recovery apparatus according to a second embodiment of the present invention.
4 is a block diagram showing a wastewater waste heat recovery apparatus according to a third embodiment of the present invention.
5 is a view illustrating a first waste heat heat exchanger of the sewage heat recovery device according to the present invention.
6 is a view illustrating a second waste heat heat exchanger of the sewage heat recovery device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For the sake of convenience, the size, line thickness, and the like of the components shown in the drawings referenced in the description of the present invention may be exaggerated somewhat. The terms used in the description of the present invention are defined in consideration of the functions of the present invention, and thus may be changed depending on the user, the intention of the operator, customs, and the like. Therefore, the definition of this term should be based on the contents throughout the specification.

1 is a conceptual diagram schematically showing a state in which the sewage waste heat recovery apparatus according to the present invention is applied to a sewage treatment plant.

As shown, the sewage treatment plant 1 includes a sewage treatment unit 2 configured to purify sewage, a sewage water inflow line 5 for supplying sewage water from the wastewater supply source 3 to the sewage treatment unit 2, It consists of a wastewater discharge line 6 which discharges the wastewater purified by the sewage treatment unit 2 to the discharge source 4 of the wastewater.

Recycling water line 8 is connected to the discharge line 6 of the wastewater, and the recycling water line 8 is supplied with purified wastewater to various demand sources 7 so that the wash water, parcel water and landscaping water are supplied to the demand sources 7. It can be used for various reuse water such as hydrophilic water.

The reuse water line 8 is connected to the wastewater waste heat recovery apparatus 1000 according to the present invention, and is configured to recover waste heat of the recycle water passing through the recycle water line 8.

2 is a view showing the wastewater waste heat recovery apparatus according to a first embodiment of the present invention.

As shown, the sewage waste heat recovery apparatus according to the present invention comprises one or more waste heat heat exchangers (10, 20) configured to exchange heat with sewage waste heat generated in the sewage treatment plant, and a primary side heat exchanger to the waste heat heat exchangers (10, 20). The heat pump 30 connected through the medium circulation line 110, the load mechanisms 41 and 42 connected to the heat pump 30 via the secondary heat exchange medium circulation line 120, and the secondary heat exchange medium circulation line ( A buffer tank 50 installed in the middle of 120 is included.

Waste heat heat exchanger (10, 20) is connected to the sewage circulation line 100 circulating the sewage waste heat generated in the sewage treatment plant, the sewage circulation line 100, the sewage, reused water line purified in the sewage treatment plant The recycled sewage (wash water, parcel water, landscaping water, hydrophilic water, etc.), unpurified sewage, and the sewage of the intermediate treatment are circulated.

According to one embodiment, the sewage circulation line 100 as shown in Figures 1 and 2 is connected to the reuse water line 8 is configured to recycle the recycle water through the sewage circulation line 100. Thus, there is no need to directly connect the pipes from the discharge source 4 to the sewage waste heat recovery apparatus 1000, and as the sewage circulation line 100 is connected to the reuse water line 8, the pipes of the sewage circulation line 100 are connected. The length can be greatly reduced, and there is an advantage of reducing power waste required for the circulation of sewage.

The sewage circulation line 100 is branched at the branch point 8a of the recycle water line 8 and passed through the waste heat heat exchanger 10 and 20 to be joined to the confluence point 8b of the recycle water line 8. do. In addition, an on-off valve 8c is provided between the branching point 8a and the confluence point 8b of the reuse water line 8, and when the closing valve 8c is closed, the reuse line 8 passes through the reuse water line 8. All of the water can be circulated in large quantities to the sewage circulation line 100 side.

The sewage circulation line 100 passes through the sewage supply pipes 101 and 103 for supplying sewage (recycled water) from the recycle water line 8 to the waste heat heat exchanger 10 and 20 and the waste heat heat exchanger 10 and 20. It consists of sewage discharge pipes (102, 104) for discharging one sewage (reuse water) to the reuse water line (8).

The sewage supply pipes 101 and 103 of the sewage circulation line 100 are provided at one side of the first sewage supply pipe 101 and the first sewage supply pipe 101 for supplying sewage (recycled water) to the first waste heat heat exchanger 10. Branched and consists of a second sewage supply pipe 103 for supplying sewage (recycled water) to the second waste heat heat exchanger 20 side.

A switching valve 105 is installed at a branch point where the first sewage supply pipe 101 and the second sewage supply pipe 103 branch, and the first sewage supply pipe 101 and the first sewage supply pipe 101 are formed by the flow path switching operation of the switching valve 105. The sewage supply pipe 103 is adjusted to selectively flow sewage to either or both sides. The switching valve 105 is configured to convert the flow of sewage, various valve structures such as a three-way valve or a modified three-way valve may be applied.

Meanwhile, circulation pumps 108a and 108b for circulating sewage (recycled water) are installed in the middle of the first sewage supply pipe 101, and the circulation pumps 108a and 108b are used for the duty circulation pump 108a and the duty. It may be composed of a standby circulation pump 108b connected in parallel to the circulation pump 108a. Accordingly, even if a failure of the duty circulation pump 108a occurs, the circulation of the sewage can be smoothed by operating the standby circulation pump 108b.

The sewage discharge pipes 102 and 104 of the sewage circulation line 100 are connected to be joined to one side of the first sewage discharge pipe 102 and the first sewage discharge pipe 102 to discharge the sewage from the first waste heat heat exchanger 10. It consists of a second sewage discharge pipe 104 for discharging sewage from the second waste heat heat exchanger (20).

Waste heat exchanger (10, 20) is composed of the first waste heat exchanger 10 and the second waste heat exchanger 20 is connected in parallel between the sewage circulation line 100 and the primary side heat exchange medium circulation line (110). .

The primary heat exchange medium circulation line 110 includes a first supply pipe 111 for supplying a primary heat exchange medium from the first waste heat heat exchanger 10 to the heat pump 30, and a first waste heat heat exchange from the heat pump 30. A first recovery pipe 112 for recovering the primary side heat exchange medium to the air 10 and a second supply pipe 113 for supplying the primary heat exchange medium to the heat pump 30 from the second waste heat heat exchanger 20; The second recovery pipe 114 recovers the primary side heat exchange medium from the heat pump 30 to the second waste heat heat exchanger 20.

The primary side heat exchange medium circulation pumps 118a and 118b for circulating the primary side heat exchange medium are installed in one of the first supply pipe 111 and the second supply pipe 113, and the primary side heat exchange medium circulation pump 118a, 118b may be composed of a duty circulation pump 118a and a standby circulation pump 118b connected in parallel to the duty circulation pump 118a. Accordingly, even if a failure of the duty circulation pump 118a occurs, the standby circulation pump 118b may be operated to smoothly circulate the primary side heat exchange medium.

The first supply pipe 111 and the second supply pipe 113 of the primary heat exchange medium circulation line 110 are connected at one side point, and are individually supplied through the first supply pipe 111 and the second supply pipe 113. The primary side heat exchange medium is joined at the connection point between the first supply pipe 111 and the second supply pipe 113 and is supplied to the heat pump 30.

The first recovery pipe 112 and the second recovery pipe 114 are connected at one side, whereby the primary side heat exchange medium passing through the heat pump 30 is classified at one side, so that the first and second waste heat exchanger Individually recovered (10, 20).

At the point where the first recovery pipe 113 is connected to the second recovery pipe 114, a switching valve 115 is installed, and the first recovery pipe 112 and the first recovery pipe 112 are operated by the flow path switching operation of the switching valve 115. The primary side heat exchange medium is adjusted to be recovered through any one or both sides of the two return pipes 114. The switching valve 115 is configured to convert the flow of the primary side heat exchange medium, various valve structures such as a three-way valve or a modified three-way valve may be applied.

The first heat exchanger 10 according to the exemplary embodiment includes a spiral heat exchanger, and as illustrated in FIG. 5, a casing 11, a heat transfer plate 12 spirally wound in the casing 11, and a heat transfer plate 12. It consists of the helical flow path 13 formed by the (), and the space parts 14a and 14b formed in the center part of the helical flow path 13.

The first sewage supply pipe 101 of the sewage circulation line 100 is connected to one side of the casing 11, and the first recovery pipe 112 of the primary heat exchange medium circulation line 110 is connected to the outer peripheral surface of the casing 11. Is connected.

As the first and second heat transfer plates 12a and 12b are spirally wound, the heat transfer plate 12 is formed to seal the spiral flow passage 13 through which the sewage and the primary side heat exchange media pass independently of each other, and the spiral flow passage 13 In the center of the space, space portions 14a and 14b are formed.

The spaces 14a and 14b are partitioned by the partition wall 15, and the first supply pipe 111 of the primary heat exchange medium circulation line 110 is connected to the space 14a of one side, and the space portion of the other side ( The first sewage discharge pipe 102 of the sewage circulation line 100 is connected to 14b).

With this configuration, the primary side heat exchange medium and the sewage pass through respective spiral flow passages in a direction crossing each other, so that the primary side heat exchange medium and the sewage heat exchange with each other.

According to one embodiment, the second waste heat heat exchanger 20 is configured as a plate heat exchanger, and as shown in FIG. 6, the second waste heat heat exchanger 20 is casing 21 and a predetermined interval within the casing 21. It includes a plurality of heat transfer plates 22 spaced apart. Between the plurality of heat transfer plates 22, a plurality of first heat transfer spaces 23 through which sewage passes and a plurality of second heat transfer spaces 24 through which the secondary side heat exchange medium passes are formed.

The second sewage supply pipe 103 and the second sewage discharge pipe 104 are connected to both ends of the casing 21, and the second sewage supply pipe 103 and the second sewage discharge pipe 104 are connected to the first heat transfer space 23. Configured to communicate.

The second supply pipe 113 of the secondary heat exchange medium circulation line 110 is connected to one side of the casing 21, and the second recovery pipe 114 of the secondary heat exchange medium circulation line 110 is connected to the other side of the casing 21. ) Is connected, and the second sewage supply pipe 103 and the second sewage discharge pipe 104 are configured to communicate with the second heat transfer space 24.

In addition, the casing 21 may be connected to a clean-in place (CIP) cleaning mechanism or the like to effectively clean the interior of the first and second heat transfer spaces 23 and 24.

By the configuration of the second waste heat exchanger 20, the sewage (recycled water) is introduced into the first heat transfer space 23 through the second sewage supply pipe 103 and then passes through the inside of the heat transfer plate 22. It is discharged through the second sewage discharge pipe (104). Then, the secondary side heat exchange medium passes through the second heat transfer space 24 through the second supply pipe 113 and is recovered through the second recovery pipe 114. Accordingly, the sewage (recycled water) passing through the first heat transfer space 23 and the secondary side heat exchange medium passing through the second heat transfer space 24 are exchanged with each other via the heat transfer plate 22.

The heat pump 30 is configured such that the refrigerant circulates through the compressor, the evaporator, the expansion valve, the condenser, and the four-way valve is installed so that the flow direction of the refrigerant is switched in accordance with cooling and heating. Heat pump 30 of the present embodiment uses an environmentally friendly refrigerant such as R-410a, and has a capacity of 25 ~ 30RT class.

The heat pump 30 performs a cooling mode or a heating mode by switching the four-way valve after exchanging heat with the primary heat exchange medium heat exchanged by the first waste heat heat exchanger 10 and the second waste heat heat exchanger 20. Thus, the secondary heat exchange medium of the secondary heat exchange medium circulation line 120 is configured to heat or cool.

The secondary heat exchange medium circulation line 120 is a supply pipe 121 for supplying the secondary heat exchange medium from the heat pump 30 to the load mechanism, and a recovery pipe for recovering the secondary heat exchange medium from the load mechanism to the heat pump 30. Consisting of 122. The buffer tank 50 is connected in communication between the supply pipe 121 and the recovery pipe 122 of the secondary heat exchange medium circulation line 120.

The load mechanism includes one or more air-conditioning mechanisms 41 that perform heating or cooling operations while the heat medium passes, such as a fan coil unit (FCU) or an air handling unit (Air Handlig Unit, AHU). As the secondary side heat exchange medium circulation line 120 is connected to the air conditioner 41, the cooling and heating operation of the air conditioning unit 41 is performed by the secondary side heat exchange medium.

Between the supply pipe 121 and the recovery pipe 122 of the secondary side heat exchange medium circulation line 120, the buffer tank 50 to perform the heat storage or heat storage function of the secondary side heat exchange medium cooled or heated by the heat pump 30 Is installed, the buffer tank 50 may be configured to temporarily store a portion of the secondary heat exchanger heat exchanged with the heat pump (30).

A first inlet 51 and an outlet 52 communicating with the supply pipe 121 are formed at one side of the buffer tank 50, and the buffer tank 50 is communicatively connected in the middle of the supply pipe 121. Looking in detail, the supply pipe 121 is the first supply pipe 121a and the outlet 52 of the buffer tank 50 connected in communication between the heat pump 30 and the first inlet 51 of the buffer tank 50. ) And a second supply pipe 121b connected to communicate between the heating and cooling mechanisms 41. Thus, after the secondary side heat exchange medium having passed through the first supply pipe 121a through the heat pump 30 flows into the buffer tank 50, the cooling and heating mechanism 41 through the second supply pipe 121b in the buffer tank 50. Is supplied.

A plurality of branch supply pipes 127 are branched and connected to an end of the second supply pipe 121b, and the plurality of branch supply pipes 127 individually extend to one side of the plurality of air conditioning appliances 41. Each branch supply pipe 127 is provided with an on / off valve 127a individually, and the heating and cooling mechanisms 41 are selectively operated by the selective opening and closing operations of the on / off valves 127a.

A plurality of branch recovery pipes 128 are connected to the end of the recovery pipe 122 to be joined, and the plurality of branch recovery pipes 128 extend individually to the other side of each cooling and heating mechanism 41.

A second inlet 53 communicating with the recovery pipe 122 is formed at the other side of the buffer tank, and the buffer recovery pipe 123 is branched at one point of the recovery pipe 122. An end of the buffer recovery pipe 123 is connected to the second inlet 53 of the buffer tank 50, and a switch valve 125 is provided at a branch portion of the buffer recovery pipe 123 of the recovery pipe 122. It is provided, and the secondary heat exchange medium is selectively recovered on any one or both sides of the heat pump 30 and the buffer tank 50 by the flow path switching operation of the switching valve 125. The switching valve 125 is configured to convert the flow of the secondary side heat exchange medium, various valve structures such as a three-way valve or a modified three-way valve may be applied.

Meanwhile, circulation pumps 128a and 128b for circulating the secondary side heat exchange medium are installed in the middle of the second supply pipe 121b, and the circulation pumps 128a and 128b include the duty circulation pump 128a and the duty circulation pump. It may consist of a standby circulation pump 128b connected in parallel to 128a. Therefore, even if a failure of the duty circulation pump 128a occurs, by operating the standby circulation pump 128b, the secondary side heat exchange medium can be smoothly circulated.

In addition, the buffer tank 50 is provided with a temperature sensing unit 55 for detecting the internal temperature of the buffer tank 50 in real time. Accordingly, when the internal temperature of the buffer tank 50 is within a range of a set temperature suitable for cooling or heating, the first and second waste heat heat exchangers 10 and 20 and the heat pump 30 are controlled by a controller (not shown). ) Is stopped and the secondary heat exchange medium circulates through only the second supply pipe 121b and the recovery pipe 122 between the cooling and heating mechanism 41 and the buffer tank 50 to cool or cool the cooling and heating mechanism 41. Heating can be performed.

As described above, the plurality of cooling and heating mechanisms 41 are stopped by the operation of the first and second waste heat heat exchangers 10 and 20, the heat pump 30, and the like by the cold storage or the heat storage action of the buffer tank 50. By selectively operating), there is an advantage that the overall energy waste can be greatly reduced.

3 is a view showing the wastewater waste heat recovery apparatus according to a second embodiment of the present invention, as shown in the load mechanism further comprises a hot water tank 42 connected to the secondary heat exchange medium circulation line 120, The hot water supply tank 42 is configured to supply hot water for hot water supply to the demand destination.

The hot water supply tank 42 is connected to the hot water supply pipe 137 and the hot water supply recovery pipe 138, and the hot water supply pipe 137 is an upstream side of the supply pipe 121 of the secondary side heat exchange medium circulation line 120. In particular, the first supply pipe (121a) is connected to be branched, the hot water recovery pipe 138 is connected to be joined to the downstream side of the recovery pipe 122 of the secondary side heat exchange medium circulation line 120.

The hot water supply supply valve 137 and the supply pipe 121 are branched from the hot water supply switching valve 137a, and the hot water supply switching valve 137a is provided with the supply pipe 121 and the hot water supply pipe 137a. ) May be adjusted to supply the secondary side heat exchange medium to either or both sides.

In addition, the hot water return recovery valve 138 and the return pipe 122 are joined to the hot water return recovery valve 138a, and the hot water recovery return valve 138a is used for the recovery pipe 122 and the hot water supply. The secondary side heat exchange medium may be adjusted to recover one or both sides of the recovery pipe 138.

Due to the configuration of the hot water supply tank 42, if the hot water supply tank 42 is to be operated in a state in which the heating mode of the heat pump 30 is in progress in the winter, the heating mode of the heat pump 30 is maintained as it is. By circulating the secondary side heat exchange medium heated by the switching operation of the hot water supply switching valve 137a and the hot water supply switching valve 138a to the hot water tank 42 side, the hot water for hot water supply in the hot water supply tank 42 can be supplied to the demand destination. Can be.

On the contrary, when the hot water tank 42 is to be operated during the cooling mode of the heat pump 30 in the summer, the heat pump 30 is temporarily switched to the heating mode to heat the secondary heat exchange medium. In addition, the hot water for hot water supply may be used in the summer season by circulating the heated secondary heat exchange medium only to the hot water supply tank 42 by the switching operation of the hot water supply switching valve 137a and the hot water supply switching valve 138a.

The rest of the configuration and operation are similar to those of the first embodiment, so detailed description thereof will be omitted.

4 is a view showing the sewage waste heat recovery apparatus according to a third embodiment of the present invention, as shown in the sewage circulation line 100 of the sewage waste heat recovery apparatus is the sewage of the intermediate treatment process of the sewage treatment line (2) Recycled water passing through the first wastewater supply pipe (101) and the first sewage discharge pipe (102) and the reuse water line (8) connected to circulate to the first waste heat heat exchanger (10) side of the second waste heat heat exchanger (20). It consists of a second sewage supply pipe 103 and the second sewage discharge pipe 104 connected to circulate to the side.

The sewage treatment line 2 is configured to purify through the reaction tank 2b after the sewage passes through a pretreatment tank 2a such as a sedimentation tank. The first waste heat of the sewage of the intermediate treatment process that passed the pretreatment tank 2a by connecting the first sewage supply pipe 101 and the first sewage discharge pipe 102 on the pipe between the pretreatment tank 2a and the reaction tank 2b. After passing through the heat exchanger 10 and the heat exchange in the first waste heat exchanger 10 is configured to discharge through the first sewage discharge pipe (102). Thus, the sewage of the intermediate treatment process passing through the pretreatment tank (2a) of the sewage treatment line (2) is relatively high to approximately 40 ~ 50 ℃, this sewage is heat exchanged through the first waste heat heat exchanger 10 as the reaction tank It cools to the temperature suitable for processing in (2b), for example, about 10-30 degreeC.

On the other hand, the sewage of the intermediate treatment process has a higher pollution degree (SS contamination) than the purified sewage, but since the spiral flow path 13 of the first waste heat exchanger 10 is relatively wide, there is almost no blockage, but the heat exchange efficiency is It may be relatively low.

As described above, the present invention efficiently recovers the sewage waste heat before flowing into the reaction tank 2b of the sewage treatment line 2 by the first waste heat heat exchanger 10, to efficiently the temperature suitable for the sewage treatment in the reaction tank 2b and the like. It can be cooled, through which there is no need for a separate cooling device for cooling the sewage can significantly reduce energy waste, and also has the advantage of reducing the installation cost.

The second sewage supply pipe 103 and the second sewage discharge pipe 104 are connected to the reuse water line 8 in the same manner as the first and second embodiments so that the recycled water is circulated to the second waste heat heat exchanger 20. Connected. As the reused water passes through the second waste heat heat exchanger 20, the pollution degree (SS contaminant) may be low, and thus the heat exchange efficiency may be relatively high.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

10: first waste heat heat exchanger 20: second waste heat heat exchanger
30: heat pump 41: air conditioning equipment
42: hot water supply mechanism 50: buffer tank
100: sewage circulation line 110: primary heat exchange medium circulation line
120: secondary side heat exchange medium circulation line

Claims (7)

At least one waste heat heat exchanger configured to exchange heat with sewage waste heat generated in the sewage treatment plant, a heat pump connected to the waste heat heat exchanger via a primary heat exchange medium circulation line, and a load mechanism connected to the heat pump via a secondary heat exchange medium circulation line. And a buffer tank installed in the middle of the secondary heat exchange medium circulation line to perform the cooling or the heat storage function of the secondary heat exchange medium cooled or heated by the heat pump.
The load mechanism includes one or more heating and cooling mechanisms for heating or cooling operation while the heat medium passes,
The secondary heat exchange medium circulation line includes a supply pipe for supplying the secondary heat exchange medium from the heat pump to the load mechanism, and a recovery pipe for recovering the secondary heat exchange medium from the load mechanism to the heat pump.
The buffer tank is communicatively connected between the supply pipe and the recovery pipe of the secondary heat exchange medium circulation line, and a first inlet and an outlet communicating with the supply pipe are formed at one side of the buffer tank, and at the other side of the buffer tank. A second entrance is formed in communication with the recovery pipe,
The supply pipe is composed of a first supply pipe connected in communication between the heat pump and the first inlet of the buffer tank, and a second supply pipe connected in communication between the outlet and the load mechanism of the buffer tank,
A buffer recovery tube is branched to one side of the recovery tube, and a switching valve is installed at a portion where the recovery tube and the buffer recovery tube are branched, and an end of the buffer recovery tube is formed at the end of the buffer tank. It is connected to 2 entrances,
The buffer tank is provided with a temperature sensing unit for detecting the internal temperature of the buffer tank in real time,
The waste heat heat exchanger comprises a first waste heat heat exchanger and a second waste heat heat exchanger connected in parallel between the sewage circulation line and the primary heat exchange medium circulation line.
The sewage circulation line includes a first wastewater supply pipe and a first sewage discharge pipe connected to circulate the sewage of an intermediate treatment process of the sewage treatment line to the first waste heat exchanger, and reused water passing through the reuse line. Sewage waste heat recovery apparatus comprising a second sewage supply pipe and a second sewage discharge pipe connected to circulate to the side. delete delete delete delete delete The method of claim 6,
The load mechanism is sewage waste heat recovery apparatus further comprises a hot water tank.

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