KR100838224B1 - Waste heat utilization hot water generator - Google Patents

Abstract

The present invention relates to a waste heat utilization type hot water generating device, in the waste heat utilization type hot water generating device for generating hot water using heat energy of exhaust gas sequentially passing through a gas discharge pipe and a stack in an exhaust gas discharge system, the exhaust gas of the stack A stack heat exchanger installed on a movement path and performing heat exchange using heat energy of exhaust gas passing through the stack; A discharge pipe heat exchanger installed in an inner space of the gas discharge pipe and performing heat exchange operation using heat energy of exhaust gas passing through the gas discharge pipe; A storage tank for storing the heat exchange water to be provided to the stack heat exchanger and the heat exchange water from the discharge pipe heat exchanger in a separated state; And a stack heat exchanger water supply unit providing the stack heat exchange water of the stack heat exchanger stored in the storage tank to the stack exchanger. Thereby, the utilization rate of the thermal energy contained in exhaust gas can be improved and it can apply easily to existing waste gas exhaust facilities.

Description

Waste heat-using hot water generator {Apparatus for Generating Hot Water Reusing the Exhaust Gas Heat}

1 is an installation state of the waste heat using hot water generating apparatus according to an embodiment of the present invention,

Figure 2 is a detailed view of the stack heat exchanger region shown in Figure 1,

Figure 3 is a state diagram of the installation of the conventional waste heat utilization hot water generating apparatus.

Explanation of symbols on the main parts of the drawings

11: stack heat exchanger 21: exhaust pipe heat exchanger

22: reprocessing heat exchanger 23: storage tank

24: steam heat exchanger 30: reheating unit

31: heater 32: heating water supply

111: inner cylinder 112: outer cylinder

113: reservoir 201: stack

202: gas discharge pipe

The present invention relates to a waste heat utilization type hot water generating device, and more particularly, to an apparatus for generating hot water using heat energy of exhaust gas sequentially passing through a gas discharge pipe and a stack in an exhaust gas discharge facility.

Industrial facilities such as industrial waste incinerators, melting furnaces, electric furnaces, thermal power plants, and semiconductor manufacturing facilities emit high-temperature exhaust gases during the treatment process, and devices that generate hot water by using the thermal energy of these exhaust gases have been devised. .

Figure 3 is a state diagram of the installation of the conventional waste heat utilization hot water generating apparatus.

Conventional waste heat utilization type hot water growth value, as shown in Figure 3, the cylindrical inner cylinder 111 standing up to communicate with the flue 203 formed underground, and cooperate with the inner cylinder 111, the water storage space (112a) It has an outer cylinder 112 standing up in the circumferential region of the inner cylinder 111, and a reservoir 113 formed on the upper side of the outer cylinder 112 to form a.

The inner cylinder 111 is made of a metal material having excellent thermal conductivity such as titanium.

In the outer cylinder 112, the water discharge pipe 114 and the inlet pipe 115 are installed to communicate with the water storage space 112a, and a pressure for controlling the pressure of the water storage space 112a at the upper end of the outer cylinder 112. The control valve 116 is provided.

A water supply pipe 117 is installed between the reservoir 113 and the water storage space 112a.

Referring to the operation of the conventional waste heat using hot water generating device having such a configuration as follows.

First, the water stored in the reservoir 113 is filled in the water storage space 112a through the water supply pipe 117.

The water in the water storage space 112a is heated by the inner cylinder 111 (heated by hot exhaust gas).

The heated water of the water storage space 112a is supplied to the predetermined region through the water discharge pipe 114, and then returns to the water storage space 112a through the inlet pipe 115.

The pressure control valve 116 operates to control the internal pressure when the water in the water storage space 112a is heated to increase the pressure.

However, according to the conventional waste heat utilization type hot water generating device, only the exhaust gas adjacent to the inner cylinder 111 among the exhaust gases passing through the inner cylinder 111 contributes to raising the temperature of the water, thereby decreasing the utilization rate of the thermal energy contained in the exhaust gas. There was a problem.

And since the thermal energy of the exhaust gas is used only in the inner cylinder 111 constituting a part of the stack, there is a problem that the utilization rate of the thermal energy contained in the exhaust gas is reduced.

In addition, since the inner cylinder 111 and the outer cylinder 112 should be formed in a stack structure, there is a problem that it is difficult to apply to the existing exhaust gas discharge facility.

Accordingly, an object of the present invention is to provide a waste heat utilization type hot water generating device which can improve the utilization rate of thermal energy contained in exhaust gas and can be easily applied to existing exhaust gas discharge equipment.

According to the present invention, in the waste heat utilization type hot water generating device for generating hot water by using the heat energy of the exhaust gas sequentially passing through the gas discharge pipe and the stack in the exhaust gas discharge facility, the exhaust gas movement path of the stack A stack heat exchanger installed at and performing heat exchange operation using heat energy of exhaust gas passing through the stack; A discharge pipe heat exchanger installed in an inner space of the gas discharge pipe and performing heat exchange operation using heat energy of exhaust gas passing through the gas discharge pipe; A storage tank for storing the heat exchange water to be provided to the stack heat exchanger and the heat exchange water from the discharge pipe heat exchanger in a separated state; It is achieved by the waste heat utilization type hot water generating device, characterized in that it comprises a stack heat exchanger water supply for providing the heat exchange water of the stack heat exchanger stored in the storage tank to the stack exchanger.

Here, the heat exchange operation is performed by using the heat energy of the exhaust gas passing through the gas discharge pipe and installed in the inner space of the gas discharge pipe so as to be adjacent to a predetermined exhaust gas generating source than the discharge pipe heat exchanger so as to efficiently use the heat energy of the exhaust gas. A reprocessing heat exchanger for supplying heat exchange water from the discharge pipe heat exchanger stored in the storage tank to the reprocessing heat exchanger as a heat exchange water interposed between the storage tank and the reprocessing heat exchanger. Including; The storage tank preferably stores the heat exchange water to be provided to the stack heat exchanger, the heat exchange water from the discharge pipe heat exchanger, and the heat exchange water from the reprocessing heat exchanger in a separated state.

The gas discharge pipe is installed in the inner space of the gas discharge pipe so as to be adjacent to a predetermined exhaust gas source than the discharge pipe heat exchanger so as to improve the heat utilization rate of the exhaust gas and to repeat the heat exchange operation in the stack heat exchanger and the discharge pipe heat exchanger. A reprocessing heat exchanger performing a heat exchange operation by using heat energy of exhaust gas passing through the gas, and a reflow heat exchanger for supplying the stored water in the storage tank to the reprocessing heat exchanger as a heat exchanged water between the storage tank and the reprocessing heat exchanger. Further comprising a treatment heat exchanger feed portion; The storage tank preferably stores the heat exchange water from the discharge pipe heat exchanger and the heat exchange water from the reprocessing heat exchanger in a mixed state.

On the other hand, the object is a waste heat utilization type hot water generating device for generating hot water by using the heat energy of the exhaust gas passing through the gas discharge pipe and the stack in sequence in the exhaust gas discharge facility, the stack is installed on the exhaust gas flow path of the stack A stack heat exchanger for performing a heat exchange operation by using heat energy of exhaust gas passing through the air; A discharge pipe heat exchanger installed in an inner space of the gas discharge pipe and performing heat exchange operation using heat energy of exhaust gas passing through the gas discharge pipe; A storage tank for storing the heat exchanged water to be provided to the stack heat exchanger and the heat exchanged water from the discharge pipe heat exchanger in a mixed state; It is achieved by a waste heat utilization type hot water generating device comprising a stack heat exchanger water supply unit for providing the storage water in the storage tank to the stack exchanger.

The gas exhaust pipe is installed in the inner space of the gas discharge pipe so as to be adjacent to a predetermined exhaust gas generating source than the discharge pipe heat exchanger so as to improve the heat utilization rate of the exhaust gas and to repeat the heat exchange operation in the stack heat exchanger and the discharge pipe heat exchanger. A reprocessing heat exchanger performing a heat exchange operation by using heat energy of exhaust gas passing through the gas, and a reflow heat exchanger for supplying the stored water in the storage tank to the reprocessing heat exchanger as a heat exchanged water between the storage tank and the reprocessing heat exchanger. Further comprising a treatment heat exchanger feed portion; The storage tank preferably stores the heat exchange water to be provided to the stack heat exchanger, the heat exchange water from the discharge pipe heat exchanger, and the heat exchange water from the reprocessing heat exchanger in a mixed state.

And a steam heat exchanger installed between the storage tank and the stack heat exchanger to perform heat exchange operation using the heat energy of the high temperature steam, so as to use the heat energy of the high temperature steam, and between the steam heat exchanger and the stack heat exchanger for the storage tank. It is preferable that the heat exchange selector for selecting the flow path is further configured.

In addition, the heating water supply unit for providing a heater and the storage water in the storage tank to the heater to adapt the temperature of the storage water stored in the storage tank to provide hot water having a temperature required by the hot water demand, and the heating of the heater. It is preferable to have a heating control unit for controlling the operation, and to further include a reheating unit for supplying the heating water of the heater to the hot water demand.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a state diagram of the waste heat utilization hot water generating apparatus according to an embodiment of the present invention, Figure 2 is a detailed view of the stack heat exchanger region shown in FIG.

Waste heat utilization type hot water growth value according to an embodiment of the present invention, as shown in these drawings, a pair of stack heat exchanger 11 and the gas discharge pipe 202 installed on the exhaust gas flow path of the stack 201 Exhaust pipe heat exchanger (21) and reprocessing heat exchanger (22), heat exchange water to be provided to the chimney heat exchanger (11), heat exchange water from the discharge pipe heat exchanger (21), and reprocessing heat exchanger A storage tank 23 for storing heat exchanged water from 22, a steam heat exchanger 24 provided between the storage tank 23 and the stack heat exchanger 11, and a steam heat exchanger for the storage tank 23; A heat exchange selection section 26 for selecting a flow path between the 24 and the stack heat exchanger 11, and a stack heat exchanger water supply section 25 for providing the stack heat exchanger 11 with the stored water in the storage tank 23; And a reprocessing heat exchanger water supply unit 28 for supplying the stored water in the storage tank 23 to the reprocessing heat exchanger 22, and the storage tank 23 and the hot water water. Cheosa has a re-heating section (30) interposed thereto.

A branch tank 12 and a collecting tank 13 are installed at the front end of the stack heat exchanger 11, and the heat exchange water and the heat exchange water enter and exit the stack heat exchanger 11 in the following manner.

That is, the heat-exchanged water provided to the stack heat exchanger 11 through the bypass pipe 14 or through the steam heat exchanger 24 is divided in the branch tank 12 and then provided to each stack heat exchanger 11. The heat exchange water from each stack heat exchanger (11) is combined in the collecting tank (13) and then provided to the discharge pipe heat exchanger (21).

Each stack heat exchanger (11) having such a configuration performs a heat exchange operation using the thermal energy of the exhaust gas passing through the stack (201).

The exhaust pipe heat exchanger 21 performs a heat exchange operation on the heat exchange water from the stack heat exchanger 11 using the heat energy of the exhaust gas passing through the gas discharge pipe 202.

The reprocessing heat exchanger 22 is located closer to a predetermined exhaust gas source 204 than the exhaust tube heat exchanger 21 (ie, the portion of the apparatus in which the exhaust gas is generated in the exhaust gas exhaust system) (that is, the reprocessing heat exchanger It is installed in the inner space of the gas discharge pipe 202 so that heat exchange can be performed using the thermal energy of the exhaust gas having a high temperature.

The storage tank 23 stores the heat exchange water to be provided to the stack heat exchanger 11 and the heat exchange water from the discharge pipe heat exchanger 21 and the heat exchange water from the reprocessing heat exchanger 22 in a mixed state.

Accordingly, the heat exchanged water to be provided to the stack heat exchanger 11 becomes raw water introduced into the storage tank 23 through a water pipe or the like before the heat exchange water from the discharge pipe heat exchanger 21 flows into the storage tank 23. After the heat exchange water from the discharge pipe heat exchanger 21 starts to flow into the storage tank 23, it becomes a mixed water of the raw water introduced into the storage tank 23 through a water pipe or the like and heat exchange water from the discharge pipe heat exchanger 21, After the heat exchange water from the reprocessing heat exchanger (22) starts to flow into the storage tank (23), the raw water flowing into the storage tank (23) through a water pipe or the like and the heat exchange water from the discharge pipe heat exchanger (21) and the reprocessing heat exchange It becomes the mixed water of the heat exchange water from group 22.

And the storage tank 23 may be configured to control the internal pressure by installing a pressure control valve.

The steam heat exchanger 24 is installed between the storage tank 23 and the stack heat exchanger 11 to perform a heat exchange operation using the thermal energy of the high temperature steam. This steam heat exchanger 24 can be implemented by installing in the steam generation source of the predetermined steam discharge system.

The heat exchange selector 26 installs an electric three-way valve at the connection point of the bypass pipe 14 directly connected to the steam heat exchanger 24 and the steam heat exchanger inlet pipe 27 connected to the steam heat exchanger 24. Can be implemented.

The flow path between the storage tank 23 and the steam heat exchanger 24 or between the storage tank 23 and the stack heat exchanger 11 is selected according to the operation state of the three-way valve.

The stack heat exchanger water supply unit 25 may be implemented by installing a stack heat exchanger water supply pump between the storage tank 23 and the stack heat exchanger 11.

The reprocessing heat exchanger water supply unit 28 may be implemented by installing a reprocessing heat exchanger water supply pump between the storage tank 23 and the reprocessing heat exchanger 22.

The reheating unit 30 includes a heater 31, a heating water supply unit 32 for supplying the storage water in the storage tank 23 to the heater 31, and a heating control unit 33 for controlling the heating operation of the heater 31. Has

The heater 31 may be implemented by an electric heating method or the like as is widely known in the art.

The heating control unit 33 may control the heating operation by a method such that the amount of power transmitted to the heater 31 varies in response to a control signal input from the outside as is widely known in the art.

The heating water supply unit 32 may be implemented by installing a heating water supply pump between the storage tank 23 and the heater 31.

Hot water needs can be a plastic house, tropical crop cultivation complex, or a cheerleader farm.

Referring to the operation of the waste heat using hot water generating apparatus according to an embodiment of the present invention having such a configuration as follows.

The heat-exchanged water supplied from the storage tank 23 through the stack heat exchanger water supply unit 25 (which initially becomes raw water of tap water) is a steam heat exchanger 24 (if selected by the heat exchange selection unit), a stack heat exchanger ( 11) while passing through the discharge pipe heat exchanger 21 sequentially and the heat exchange is made is stored in the storage tank (23).

The heat exchange water from the discharge pipe exchanger 21 stored in the storage tank 23 is provided to the reprocessing heat exchanger 22 through the reprocessing heat exchanger water supply 28.

The heat exchange water having undergone heat exchange in the reprocessing heat exchanger 22 is stored in the storage tank 23.

The storage water in the storage tank 23 is sequentially subjected to the steam heat exchanger 24 (if selected by the heat exchange selection unit), the stack heat exchanger 11, and the discharge pipe heat exchanger 21 through the stack heat exchanger water supply unit 25. As it passes through, heat exchange takes place.

And the storage water in the storage tank 23 is provided to the heater 31 through the heating water supply unit 32 is heated and then supplied to the hot water demand.

Meanwhile, in the above-described embodiment, the storage tank 23 is a mixture of the heat exchanged water to be provided to the stack heat exchanger 11 and the heat exchanged water from the discharge pipe heat exchanger 21 and the heat exchanged water from the reprocessing heat exchanger 22. Although it is configured to be stored, the present invention can be implemented by varying the storage method of the storage tank 23 in the following manner.

① Stores the heat exchange water to be supplied to the stack heat exchanger 11 and the heat exchange water from the discharge pipe heat exchanger 21 and the heat exchange water from the reprocessing heat exchanger 22 in separate states (three in one storage tank). Create a storage space or consist of three storage tanks)

② The heat exchange water to be supplied to the stack heat exchanger 11 and the heat exchange water from the discharge pipe heat exchanger 21 are stored in a mixed state, and only the heat exchange water from the reprocessing heat exchanger 22 is separated and stored (one storage tank). Two storage spaces or two storage tanks)

③ The heat exchanged water to be provided to the chimney heat exchanger 11 is separately stored, while the heat exchanged water from the discharge pipe heat exchanger 21 and the heat exchanged water from the reprocessing heat exchanger 22 are mixed and stored (2 in one storage tank). Two storage spaces or two storage tanks)

According to the embodiment of the present invention as described above, the heat exchange operation in the flue heat exchanger 11 and the discharge pipe heat exchanger 21 installed in the inner space of the gas discharge pipe 202 installed on the exhaust gas movement path of the stack 201 By this, the utilization rate of the thermal energy contained in the exhaust gas can be improved and can be easily applied to existing exhaust gas discharge equipment.

By adding the reprocessing heat exchanger 22, the heat utilization rate of the exhaust gas can be improved.

In addition, all or part of the heat exchange water to be supplied to the stack heat exchanger 11, the heat exchange water from the discharge pipe heat exchanger 21, and the heat exchange water from the reprocessing heat exchanger 22 are stored in the storage tank 23 in a mixed state. By doing so, the heat exchange action in the stack heat exchanger 11 and the discharge pipe heat exchanger 21 can be repeated.

In addition, by adding the heat exchange selection unit 26, it is possible to use the heat energy of the high temperature steam.

In addition, by adding the reheating unit 30, it is possible to provide hot water having a temperature required by the hot water demand by adapting to the temperature of the stored water stored in the storage tank (23).

Therefore, according to the present invention, the heat exchange operation is performed in the stack heat exchanger installed on the exhaust gas flow path of the stack and the exhaust pipe heat exchanger installed in the inner space of the gas discharge pipe, thereby improving the utilization rate of the thermal energy contained in the exhaust gas. It can be easily applied to the exhaust gas discharge equipment of the.

Claims (7)

In the waste heat utilization type hot water generating device for generating hot water by using the heat energy of the exhaust gas sequentially passing through the gas discharge pipe and the stack in the exhaust gas discharge facility, A stack heat exchanger installed on the exhaust gas movement path of the stack to perform heat exchange using heat energy of the exhaust gas passing through the stack; A discharge pipe heat exchanger installed in an inner space of the gas discharge pipe and performing heat exchange operation using heat energy of exhaust gas passing through the gas discharge pipe; A storage tank for storing the heat exchange water to be provided to the stack heat exchanger and the heat exchange water from the discharge pipe heat exchanger in a separated state; And a stack heat exchanger water supply unit for providing the stack heat exchange water of the stack heat exchanger stored in the storage tank to the stack exchanger. The method of claim 1, A reprocessing heat exchanger installed in an inner space of the gas discharge pipe so as to be adjacent to a predetermined exhaust gas generating source than the discharge pipe heat exchanger and performing a heat exchange operation by using heat energy of exhaust gas passing through the gas discharge pipe, the storage tank and the ash A reprocessing heat exchanger water supply unit for providing heat exchange water from the discharge pipe heat exchanger stored in the storage tank to the reprocessing heat exchanger as inter-heat exchange water interposed between the process heat exchangers; And the storage tank stores the heat exchange water to be provided to the stack heat exchanger, the heat exchange water from the discharge pipe heat exchanger, and the heat exchange water from the reprocessing heat exchanger in a separated state. The method of claim 1, A reprocessing heat exchanger installed in an inner space of the gas discharge pipe so as to be adjacent to a predetermined exhaust gas generating source than the discharge pipe heat exchanger and performing a heat exchange operation by using heat energy of exhaust gas passing through the gas discharge pipe, the storage tank and the ash A reprocessing heat exchanger water supply unit interposed between process heat exchangers for providing stored water in the storage tank to the reprocessing heat exchanger as heat exchanged water; And the storage tank stores the heat exchange water from the discharge pipe heat exchanger and the heat exchange water from the reprocessing heat exchanger in a mixed state. In the waste heat utilization type hot water generating device for generating hot water by using the heat energy of the exhaust gas sequentially passing through the gas discharge pipe and the stack in the exhaust gas discharge facility, A stack heat exchanger installed on the exhaust gas movement path of the stack to perform heat exchange using heat energy of the exhaust gas passing through the stack; A discharge tube heat exchanger installed in an inner space of the gas discharge tube and performing a heat exchange operation using thermal energy of an exhaust gas passing through the gas discharge tube; A storage tank for storing the heat exchanged water to be provided to the stack heat exchanger and the heat exchanged water from the discharge pipe heat exchanger in a mixed state; Waste heat utilization type hot water generating device comprising a stack heat exchanger water supply for providing the storage water in the storage tank to the stack exchanger. The method of claim 4, wherein A reprocessing heat exchanger installed in an inner space of the gas discharge pipe so as to be adjacent to a predetermined exhaust gas generating source than the discharge pipe heat exchanger and performing a heat exchange operation by using heat energy of exhaust gas passing through the gas discharge pipe, the storage tank and the ash A reprocessing heat exchanger water supply unit interposed between process heat exchangers for providing stored water in the storage tank to the reprocessing heat exchanger as heat exchanged water; And the storage tank stores waste heat exchange water to be provided to the stack heat exchanger, heat exchange water from the discharge pipe heat exchanger, and heat exchange water from the reprocessing heat exchanger in a mixed state. The method according to any one of claims 1 to 5, A steam heat exchanger installed between the storage tank and the stack heat exchanger and performing a heat exchange operation using heat energy of high temperature steam, and a heat exchange selector configured to select a flow path between the steam heat exchanger and the stack heat exchanger for the storage tank; Waste heat utilization type hot water generating device, characterized in that. The method according to claim 3 or 4, And a heating water supply unit for providing a heater and storage water in the storage tank to the heater, and a heating control unit for controlling a heating operation of the heater, and reheating unit for supplying the heating water of the heater to the hot water demand. Waste heat utilization type hot water generating device.

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