KR20210128740A - Deformable system for two-way heat linkage with district heating - Google Patents

Abstract

The present invention provides a variable type system for district heating and bidirectional hot-rolling system. The variable type system for the district heating and the bidirectional hot-rolling system of the present invention comprises: a pipe line in which a supply pipe and a recovery pipe for supplying a heat source supplied from district heating are disposed; a water wheel pump installed in one area of the pipe line to generate an electric power; an ORC heat pump unit disposed in one area of the district heating pipe line; and a first heat exchange unit for supplying or recovering the heat source to a user side through heat exchange with the ORC heat pump unit. The water wheel pump is driven in a water wheel mode or a pump mode according to an operation of the first heat exchange unit. An objective of the present invention is to provide the variable type system for the bidirectional hot-rolling system in order to increase an operation rate of a new and renewable thermal energy facility linked to the district heating.

Description

Deformable system for two-way heat linkage with district heating

The embodiment relates to a variable system for district heating and a two-way hot-rolling system. More specifically, it relates to a variable system for district heating and bidirectional hot coupling to increase the production and utilization of new and renewable thermal energy linked to district heating in response to heat demand.

In general, district heating uses heat economically produced in concentrated large-scale heat source facilities (cogeneration plants, heat-only boilers, waste incinerators, etc.) This is an efficient heating method that supplies heating and hot water to the entire region, creates a pleasant urban environment, and contributes to energy saving and environmental pollution improvement.

In other words, district heating produces high-temperature water (around 115 to 120 degrees Celsius) necessary for heating and hot water supply using large-scale heat production facilities, without individual heating facilities in various buildings or facilities within a city or a certain area. Therefore, it is one of the collective energy supply methods as a system that supplies a heat source to each recipient through a heat transport pipe under high pressure.

On the other hand, recently, in order to reduce the power generation of large-scale fossil fuels in a centralized manner and to expand the use of new and renewable energy, research on power generation systems based on renewable energy such as solar or wind power and fuel cells has been actively conducted. is in progress

However, the amount of generation of renewable energy and the amount of heat used by heat users are highly variable, respectively, depending on the environment. Therefore, it is very difficult to match heat production and heat demand, so a heat storage tank is installed to meet the volatility, but the heat storage tank has a problem of occupying a lot of space due to its large volume.

An object of the embodiment is to provide a variable system for a two-way hot coupling system in order to increase the operation rate of a new and renewable thermal energy facility linked to district heating.

The problem to be solved by the present invention is not limited to the problems mentioned above, and other problems not mentioned here will be clearly understood by those skilled in the art from the following description.

An embodiment of the present invention includes a piping line in which a supply pipe and a recovery pipe for supplying a heat source supplied from district heating are disposed; a water wheel pump installed in one area of the pipe line to generate electric power; ORC heat pump unit disposed in one area of the pipe line of the district heating; and a first heat exchange unit supplying or recovering a heat source to the user side through heat exchange with the ORC heat pump unit, wherein the water wheel pump is driven in a water wheel mode or a pump mode according to an operation of the first heat exchange unit can do.

Preferably, when the first heat exchange unit supplies heat to the user, the water wheel pump may be driven by a water wheel to generate power.

Preferably, when the first heat exchange unit recovers heat from the user side, the water wheel pump may operate as a pump to reversely transfer the heat source of the pipe line.

Preferably, the ORC heat pump unit includes a circulation line through which the organic medium moves, a second heat exchange unit disposed in the circulation line to exchange heat with a heat source moving along the pipe line, and the organic medium passing through the first heat exchange unit. It may include a turbine unit for generating electric power by using the turbine unit, the first heat exchange unit for exchanging heat with the organic medium passing through the turbine unit, and a pump unit for pressurizing the organic medium passing through the first heat exchange unit.

Preferably, the ORC heat pump unit includes a first bypass line bypassing the pump unit and a second bypass line bypassing the turbine unit, and the second bypass line is provided with a three-way valve, The second bypass line may be provided with a compressor.

Preferably, when the first heat exchange unit supplies heat to the user, the organic medium circulates through an operation of the pump unit, and the organic medium includes the first heat exchange unit, the turbine unit, the second heat exchange unit, and the pump. It can be characterized by circulating wealth.

Preferably, when the first heat exchange unit recovers heat to the user side, the organic medium circulates through an operation of the compressor disposed in the second bypass line, and the organic medium includes the compressor and the second heat exchange unit. , the first bypass line and the first heat exchange unit may be circulated.

According to the embodiment, it is possible to reduce the initial investment cost of the hot-rolled system and secure the operational flexibility.

In addition, there is an effect of reducing the use of fossil energy and reducing greenhouse gases through efficient flexible operation.

Various and advantageous advantages and effects of the present invention are not limited to the above, and will be more easily understood in the course of describing specific embodiments of the present invention.

1 is a structural diagram of a variable system for district heating and a two-way hot-coupled system according to an embodiment of the present invention;
2 is a view showing the operating state in the hydro turbine and ORC simultaneous power generation mode of FIG. 1,
FIG. 3 is a diagram illustrating an operation state in a district heating water warming mode during recovery of unused heat and cooling of FIG. 2 .

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

However, the technical spirit of the present invention is not limited to some embodiments described, but may be implemented in various different forms, and within the scope of the technical spirit of the present invention, one or more of the components may be selected among the embodiments. It can be combined and substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be generally understood by those of ordinary skill in the art to which the present invention pertains, unless specifically defined and described explicitly. It may be interpreted as a meaning, and generally used terms such as terms defined in advance may be interpreted in consideration of the contextual meaning of the related art.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In this specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when it is described as “at least one (or more than one) of A and (and) B, C”, it is combined with A, B, and C It may include one or more of all possible combinations.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

These terms are only used to distinguish the component from other components, and are not limited to the essence, order, or order of the component by the term.

And, when it is described that a component is 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also with the component It may also include a case of 'connected', 'coupled' or 'connected' due to another element between the other elements.

In addition, when it is described as being formed or disposed on “above (above) or under (below)” of each component, the top (above) or bottom (below) is one as well as when two components are in direct contact with each other. Also includes a case in which another component as described above is formed or disposed between two components. In addition, when expressed as “upper (upper) or lower (lower)”, the meaning of not only an upward direction but also a downward direction based on one component may be included.

Hereinafter, the embodiment will be described in detail with reference to the accompanying drawings, but the same or corresponding components are assigned the same reference numerals regardless of reference numerals, and overlapping descriptions thereof will be omitted.

1 to 3, in order to clearly understand the present invention conceptually, only the main characteristic parts are clearly shown, and as a result, various modifications of the illustration are expected, and the scope of the present invention is limited by the specific shape shown in the drawings it doesn't have to be

1 is a structural diagram of a variable type system for district heating and a bidirectional hot coupling system according to an embodiment of the present invention.

Referring to FIG. 1 , a variable system for district heating and bidirectional thermal coupling according to an embodiment of the present invention includes a piping line 100 , a water wheel pump 130 , an ORC heat pump unit 200 , and a first heat exchange unit 220 . ) may be included.

The pipe line 100 may include a pipe through which the heat source supplied from the district heating is distributed and moved to each user or facility. In this case, the supply pipe 110 and the recovery pipe 120 may be disposed in the piping line 100 .

In general, district heating produces a heat source and supplies it to users. At this time, medium temperature water is used as the heat source. In district heating, various buildings such as houses, shopping malls, offices, schools, hospitals, and factories within a city or a certain area do not have individual heating facilities, and large-scale heat production facilities, that is, cogeneration plants, are constructed to provide heating and hot water supply. It is a system that produces medium-temperature water (110~120℃) and supplies it to each customer through a heat transport pipe. It is one of the collective energy supply methods.

In such district heating, the structure of the heat supply unit may be variously modified.

The water wheel pump 130 may be installed in one area of the piping line 100 to generate electric power.

The water wheel pump 130 is disposed between the supply pipe 110 and the recovery pipe 120 , and may generate electric power using a heat source supplied from the supply pipe 110 . The structure of the water wheel pump 130 is not limited and may be modified and implemented in various structures for generating electric power using a generator.

Also, the water wheel pump 130 may be driven in the water wheel mode or the pump mode according to the operation of the first heat exchange unit 220 .

In general, in district heating, medium hot water at around 115°C is supplied to about 10 bar through the supply pipe 110 , and water at 55°C is recovered in the return pipe 120 at 4 to 5 bar. In this case, the water wheel pump 130 may generate electric power using the pressure difference.

Also, the water wheel pump 130 may be driven in the pump mode according to the operation of the first heat exchange unit 220 .

When the first heat exchange unit 220 recovers heat from the user 300 , the water wheel pump 130 may be driven as a pump to reverse the flow of the recovery pipe 120 and the supply pipe 110 . In this case, the water wheel pump 130 may receive power and operate as a pump to move water from the recovery pipe 120 side to the supply pipe 110 side.

The ORC heat pump unit 200 may be disposed in one area of the piping line 100 for district heating.

The ORC heat pump unit 200 may include a circulation line 210 , a first heat exchange unit 220 , a pump unit 250 , a second heat exchange unit 230 , and a turbine unit 240 .

The circulation line 210 refers to a line through which an organic medium moves in order to generate power using an Organic Rankine Cycle (ORC).

Organic Rankine cycle power generation is a Rankine cycle using an organic medium as a working fluid. After boiling the working medium to a high temperature and high pressure using relatively low temperature waste heat, it is expanded through a turbine to obtain torque, and power is generated through a generator.

The first heat exchange unit 220 may transfer or recover heat to the user 300 side by exchanging heat with the organic medium that has passed through the turbine unit 240 .

The pump unit 250 pressurizes the organic medium that has passed through the first heat exchange unit 220 so that the organic medium circulates through the circulation line 210 .

The second heat exchange unit 230 may be disposed on the circulation line 210 to exchange heat with a heat source moving along the pipe line 100 .

The turbine unit 240 may generate power using the organic medium heat-exchanged through the second heat exchange unit 230 .

In addition, the ORC heat pump unit 200 may change the circulation line 210 of the organic medium to supply unused heat from the user 300 side back to the supply pipe 110 .

In this case, the ORC heat pump unit 200 may include a first bypass line 260 and a second bypass line 270 .

The first bypass line 260 may allow the organic medium to bypass the pump unit 250 . In this case, a three-way valve 261 is disposed in a region to which the first bypass line 260 is connected to control the movement direction of the organic medium.

In one embodiment, a check valve 262 for blocking the movement of the organic medium may be disposed in the first bypass line 260 .

The second bypass line 270 is disposed so that the organic medium bypasses the turbine unit 240 . A three-way valve 271 may be disposed in one region connected to the circulation line 210 in the second bypass line 270 , and a compressor 272 may be provided in the second bypass line 270 . .

When the organic medium is circulated using the pump unit 250 , a low pressure is required, and thus the organic medium can be circulated even if the capacity of the pump unit 250 is low. However, when heat is recovered from the user 300 and the organic medium is circulated, the compressor 272 may be used instead of the pump unit 250 .

The compressor 272 compresses the organic refrigerant so that heat exchange occurs in the second heat exchange unit 230 at a high temperature, thereby increasing heat exchange efficiency.

FIG. 2 is a view showing an operation state in the hydro turbine and ORC simultaneous generation power generation mode of FIG. 1; FIG.

Referring to FIG. 2 , in the variable system for district heating and bidirectional thermal coupling according to an embodiment of the present invention, the medium hot water supplied from the district heating through the supply pipe 110 is transferred to the ORC heat pump through the second heat exchange unit 230 . Heat exchange with the organic medium of the unit 200 is performed. The medium hot water that has undergone heat exchange passes through the water wheel pump 130 , and the water wheel pump 130 uses this to generate electric power.

The heat-exchanged organic medium circulates along the circulation line 210 of the ORC heat pump unit 200 .

The first bypass line 260 and the second bypass line 270 operate the three-way valves 261,271 to close, and the organic medium is the second heat exchange unit 230 by the operation of the pump unit 250, The turbine unit 240 and the first heat exchange unit 220 are circulated. At this time, the turbine unit 240 generates electric power, and the first heat exchange unit 220 may supply heat to the user 300 side.

FIG. 3 is a diagram illustrating an operation state in a district heating water warming mode during recovery of unused heat and cooling of FIG. 2 .

Referring to FIG. 3 , the ORC heat pump unit 200 circulates in order to recover unused heat or sewage heat from the user 300 side.

The first bypass line 260 may have the upper side and the right side of the three-way valve 261 open and the left side closed to bypass the pump unit 250 so that the organic medium bypasses the pump unit 250 . .

The second bypass line 270 may have the left and lower sides of the three-way valve 271 open and the right side closed to bypass the turbine unit 240 so that the organic medium bypasses the turbine unit 240 . .

At this time, the compressor 272 disposed on the second bypass line 270 compresses the organic medium and moves the temperature to a high temperature, and the heated organic medium moves the piping line 100 in the second heat exchange unit 230 . It can exchange heat with hot water.

The water wheel pump 130 disposed in the piping line 100 receives power and operates as a pump to move the hot water of the line moving the recovery pipe 120 to the supply pipe 110, and the recovered water at 55° C. is the second The temperature may be increased in the heat exchange unit 230 and supplied to the supply pipe 110 .

Through this, the unused heat from the user 300 side can be recovered and re-supplied to the supply side, and heat use efficiency can be increased.

As described above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions are possible within the range that does not depart from the essential characteristics of the present invention by those of ordinary skill in the art to which the present invention pertains. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings. . The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: piping line
110: supply pipe
120: recovery tube
130: water wheel pump
200: ORC heat pump unit
210: circulation line
220: first heat exchange unit
230: second heat exchange unit
240: turbine unit
250: pump unit
260: first bypass line
261, 271: 3-way valve
262: check valve
270: second bypass line
272: compressor
300 : user

Claims (7)

a piping line in which a supply pipe and a recovery pipe for supplying a heat source supplied from district heating are disposed;
a water wheel pump installed in one area of the pipe line to generate electric power;
an ORC heat pump unit disposed in one area of the district heating pipe line; and
a first heat exchange unit for supplying or recovering a heat source to the user side through heat exchange with the ORC heat pump unit;
includes,
The water wheel pump is a variable type system for district heating and bidirectional hot coupling, characterized in that the water wheel pump is driven in a water wheel mode or a pump mode according to the operation of the first heat exchange unit. According to claim 1,
When the first heat exchange unit supplies heat to the user, the water wheel pump is driven by the water wheel to generate power. According to claim 1,
When the first heat exchange unit recovers heat from the user side, the water wheel pump operates as a pump to transfer the heat source of the pipe line in the opposite direction. According to claim 1,
The ORC heat pump unit
Circulation line through which the organic medium moves,
a second heat exchange unit disposed in the circulation line to exchange heat with a heat source moving along the pipe line;
a turbine unit for generating electric power using the organic medium that has passed through the first heat exchange unit;
the first heat exchange unit exchanging heat with the organic medium passing through the turbine unit; and
a pump unit for pressurizing the organic medium that has passed through the first heat exchange unit;
Variable system for district heating and two-way hot-rolling system including 5. The method of claim 4,
The ORC heat pump unit
a first bypass line bypassing the pump unit; and
a second bypass line bypassing the turbine unit;
The second bypass line is provided with a three-way valve,
A variable type system for district heating and bidirectional hot coupling, characterized in that the second bypass line is provided with a compressor. 6. The method of claim 5,
When the first heat exchange unit supplies heat to the user side,
The organic medium circulates through the operation of the pump unit, and the organic medium circulates through the first heat exchange unit, the turbine unit, the second heat exchange unit, and the pump unit. . 6. The method of claim 5,
When the first heat exchange unit recovers heat to the user side,
The organic medium circulates through an operation of the compressor disposed in the second bypass line, and the organic medium circulates through the compressor, the second heat exchange unit, the first bypass line, and the first heat exchange unit. Variable system for district heating and bidirectional hot-rolling system.

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