KR20160081758A - High efficiency low temperature power generation system by evaporator - Google Patents

High efficiency low temperature power generation system by evaporator Download PDF

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Publication number
KR20160081758A
KR20160081758A KR1020150068353A KR20150068353A KR20160081758A KR 20160081758 A KR20160081758 A KR 20160081758A KR 1020150068353 A KR1020150068353 A KR 1020150068353A KR 20150068353 A KR20150068353 A KR 20150068353A KR 20160081758 A KR20160081758 A KR 20160081758A
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heat
heating medium
evaporation
expansion
power generation
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KR1020150068353A
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Korean (ko)
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이만숙
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이만숙
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Priority to PCT/KR2015/014409 priority Critical patent/WO2016108578A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K21/00—Steam engine plants not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

A high efficiency low temperature power generation system by an evaporation apparatus is disclosed. The high-efficiency low-temperature power generation system of the evaporation apparatus of the present invention is characterized by compressing, heating expansion, evaporation, and expansion (power generation) in order to improve the power generation efficiency of an organic Rankine cycle, which generates electricity by driving a turbine using an organic working fluid , A modified application organic Rankine cycle that is cycled to the stage of condensation, comprising: a power generation module comprising a turbine and a generator; A condensation module for absorbing and condensing the heat of the heating medium; An operation pump for compressing and transferring the heating medium; An evaporation module for evaporating the heating medium; And a superheater for superheating the heating medium, wherein the evaporation module comprises: an expansion nozzle for expanding the volume of the heating medium; And an evaporator for supplying heat to the expanded heating medium to evaporate the heating medium. The heating medium is compressed to a temperature higher than the evaporating pressure of the evaporator in the operating pump and is introduced into the expansion nozzle to evaporate the pressure of the working fluid using the pressure difference. .

Description

TECHNICAL FIELD [0001] The present invention relates to a high efficiency low temperature power generation system using an evaporation apparatus,

The present invention relates to a high-efficiency low-temperature power generation system by an evaporation apparatus, and more particularly to a high-efficiency low-temperature power generation system using an organic working fluid (refrigerant) as a heating medium, , And evaporation, expansion (power generation), and condensation. The present invention also relates to a high-efficiency low-temperature power generation system using the evaporation apparatus.

The development by organic Rankine cycle (ORC) is a waste heat recovery system that uses waste heat generated from various processes of industrial plant facilities including steelworks, and a solar heat generation system that collects solar heat by collecting solar heat power generation, a gradient power generation system, and a binary geothermal power generation system that uses geothermal power, and the like. It has not been widely spread over the utilization technology of other renewable energy with a very low efficiency.

Particularly, the power generation technology using an organic heating medium having a very low boiling point, such as refrigerating gas for refrigeration, for generating electricity using low temperature, should be a technology for using renewable energy that can utilize waste heat of around 100 ° C. However, It is a reality that it has technical limit which is extremely low efficiency.

Development by the organic Rankine cycle is disclosed in Korean Patent Laid-Open Nos. 2014-0015422, 2012-0039986 and 1290289, Korean Patent Publication Nos. 2014-0015422, 2012-0039986, The organic Rankine cycle of Patent No. 1290289 has the same cycle diagram as in Fig.

As shown in FIG. 1, in order to generate electricity using the organic Rankine cycle, it is necessary to raise the temperature and the pressure at the same time and evaporate to expect the power generation efficiency. However, in the properties of the material, the conditions of evaporation are such that when the other conditions are the same, the pressure is lowered and the temperature is raised to facilitate evaporation. Conversely, the condition of condensation is that the pressure is raised and the condensation is easily made when the temperature is lowered.

However, the power generation by the organic Rankine cycle is advantageous for the condensation due to the pressure elevated during the evaporation of the organic heating medium as the heating medium is evaporated under the condition that the external heat source is supplied in the closed evaporator and the temperature and the pressure are raised simultaneously A relatively higher temperature rise relative to the elevated pressure is required as the temperature rises and disturbs favorable conditions for evaporation.

Therefore, it is possible to generate electricity by continuous evaporation of the heat medium, although there is a supply of the required heat amount based on the minimum heating temperature necessary for the evaporation which can absorb the latent heat of evaporation during the phase change process.

In the high efficiency power generation cycle of Korean Patent Application No. 10-2014-0095894 filed by the applicant of the present invention, the content of the minimum heating temperature necessary for evaporation is described, and the contents described in Application No. 10-2014-0095894 As a result, it can be confirmed that the conventional organic Rankine cycle is not a sufficient power generation efficiency as a technology for using renewable energy.

Further, in the power generation by the organic Rankine cycle having the heating medium such as refrigerating refrigerant gas which evaporates at a low temperature, the specific volume difference between the gas and the liquid gas during the condensation of the heating medium is large and the condensing pressure is lowered, So that the power generation efficiency is lowered due to the back pressure.

As described above, since the economic efficiency of generation by the organic Rankine cycle can not be sufficiently expected as a technology of using renewable energy, development of power generation technology for thermal energy conversion by a power generation cycle capable of improving power generation efficiency by a new method is required do.

(0001) Korean Patent Publication No. 2014-0015422 (Publication date: 2014.02.06) (0002) Korean Patent Publication No. 2012-0039986 (Publication date: April 26, 2012) (0003) Korean Patent Registration No. 1290289 (Registered on July 23, 2013)

An object of the present invention is to provide a high-efficiency low-temperature power generation system by an evaporation apparatus comprising an organic Rankine cycle modified to improve power generation efficiency by lowering a usable temperature range of a heating medium.

According to the present invention, the above object can be achieved by a method of operating a turbine, comprising the steps of: compressing, heating expansion, evaporation, expansion (power generation) and condensation as a modified application organic Rankine cycle that generates electricity by driving a turbine using a refrigerant as a heat medium, A power generation module including the power generation module; A condensing module for absorbing and condensing the heat of the heating medium; An operation pump for compressing and transferring the heating medium; An evaporation module for evaporating the heating medium; And a superheater for superheating the heating medium, wherein the evaporation module comprises: an expansion nozzle for expanding the volume of the heating medium; And an evaporator for supplying heat to the expanded heating medium to thereby evaporate the heated medium, wherein the heating medium is compressed to a temperature higher than the evaporation pressure of the evaporator in the operating pump and flows into the expansion nozzle. Power generation system.

Wherein the evaporation module includes a preheater formed between the operation pump and the expansion nozzle to supply heat to the heat medium to supply sensible heat among the evaporation enthalpy of the heat medium and the heat medium is supplied to the preheater and the expansion nozzle To evaporate the latent heat of evaporation in the evaporator after it has been heated and expanded.

And a heat storage tank for storing external heat sources of solar heat, waste heat, geothermal heat or air heat, and a circulation line is formed in which heat source fluid of the heat storage tank circulates heat through the heat storage tank, the superheater, the evaporator and the preheater, And the circulation line may be formed by the evaporator, the superheater, and the preheater so as to improve power generation efficiency according to the temperature of the supplied heat source.

Wherein the evaporator comprises: an expansion type expansion tube through which the heating medium expanded in the expansion nozzle moves; And a housing having the expandable expansion pipe therein and the heat source fluid of the circulation line flowing into the internal space and exchanging heat with the expandable expansion pipe and flowing out.

The evaporator may include a housing in which the heating medium expanded from the expansion nozzle flows into the inner space, and the circulation line passes through the inner space and heat-exchanges with the heating medium.

The condensing module includes: an air-cooled condenser for cooling the heating medium by heat exchange with air; A water-cooled condenser for exchanging heat with cooling water by a cooling device to cool the heating medium; And a service tank installed between the air-cooled condenser and the water-cooled condenser and filled with nitrogen gas so as to prevent a pressure drop of the heating medium due to the volume reduction.

The condensing module may further include a water-cooled condensing tank for cooling the heating medium by heat exchange with the cooling water so as to increase the viscosity of the liquefied heating medium to improve the feeding efficiency of the operating pump.

According to the present invention, the above object can be achieved by a method of operating a turbine, comprising the steps of: compressing, heating expansion, evaporation, expansion (power generation) and condensation as a modified application organic Rankine cycle that generates electricity by driving a turbine using a refrigerant as a heat medium, A power generation module including the power generation module; A condenser for absorbing and condensing the heat of the heating medium; An operation pump for compressing and transferring the heating medium; An evaporation module for evaporating the heating medium; A superheater for superheating the heating medium; A heat storage tank for storing an external heat source; And a circulation line through which the heat source fluid of the heat storage tank circulates and circulates through the heat storage tank, the superheater, and the evaporation module, and the evaporation module is configured to circulate the heat source fluid in the circulation line A housing that flows out; A preheating tube provided in the housing and moving the heating medium introduced from the operation pump to receive sensible heat among the evaporation enthalpy of the heating medium from the heat source fluid; A shrinking tube connected to the preheating tube inside the housing and lowering the pressure of the heating medium to absorb latent heat among the evaporation enthalpy of the heating medium from the heating source fluid; And an expansion type expansion tube connected to the shrinkage tube in the housing and expanding by heat exchange with the heat medium fluid by the heat source fluid.

According to the present invention, the above object can be achieved by a method of operating a turbine, comprising the steps of: compressing, heating expansion, evaporation, expansion (power generation) and condensation as a modified application organic Rankine cycle that generates electricity by driving a turbine using a refrigerant as a heat medium, A power generation module including the power generation module; A condenser for absorbing and condensing the heat of the heating medium; An operation pump for compressing and transferring the heating medium; An evaporation module for evaporating the heating medium; A superheater for superheating the heating medium; A heat storage tank for storing an external heat source; And a circulation line through which the heat source fluid of the heat storage tank circulates and circulates through the heat storage tank, the superheater, and the evaporation module, and the evaporation module is configured to circulate the heat source fluid in the circulation line A housing that flows out; A preheating tube provided in the housing and moving the heating medium introduced from the operation pump to receive sensible heat among the evaporation enthalpy of the heating medium from the heat source fluid; And a multistage expansion type expansion pipe connected to the preheating pipe inside the housing and performing heat exchange with the heat source fluid to expand the volume of the heating medium.

According to the present invention, since the heating medium is heated and expanded after being passed through the preheater and the expansion nozzle, and is evaporated at a low temperature in the evaporator, the evaporation apparatus comprising the applied organic Rankine cycle modified to improve the power generation efficiency by lowering the useable temperature range of the heating medium Thereby providing a high efficiency low temperature power generation system.

1 is a pressure-enthalpy diagram of a conventional low-temperature power generation system.
2 is a pressure-enthalpy diagram of a high efficiency low temperature power generation system by an evaporation apparatus according to an embodiment of the present invention.
3 is a configuration diagram of a high-efficiency low-temperature power generation system by the evaporation apparatus of FIG. 2;
FIG. 4 is a view showing a vaporization module of a high-efficiency low-temperature power generation system by the evaporation apparatus of FIG. 3;
5 is a view showing an evaporator of a high efficiency low temperature power generation system by the evaporation apparatus of FIG.
6 is a configuration diagram showing a condensing module of a high-efficiency low-temperature power generation system by the vaporizing device of FIG. 3;
7 is a view showing an integrated evaporation module of a high efficiency low temperature power generation system by an evaporation apparatus according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the well-known functions or constructions are not described in order to simplify the gist of the present invention.

The high efficiency low temperature power generation system of the evaporation apparatus of the present invention comprises an applied organic Rankine cycle which is modified to improve the power generation efficiency by lowering the use temperature range in which the heating medium can be generated.

2 is a pressure-enthalpy diagram of a high-efficiency low-temperature power generation system by an evaporation apparatus according to an embodiment of the present invention, FIG. 3 is a graph showing a pressure-enthalpy diagram of a high- 5 is a view showing an evaporator of a high efficiency low temperature power generation system by the evaporation apparatus of FIG. 3, and FIG. 6 is a view showing the evaporator of the high efficiency low temperature power generation system by the evaporation apparatus of FIG. FIG. 7 is a view showing an integrated evaporation module of a high efficiency low temperature power generation system according to another embodiment of the present invention, and FIG. 7 is a view showing an integrated evaporation module of a high efficiency low temperature power generation system by the evaporation apparatus according to another embodiment of the present invention.

3, a high-efficiency low temperature power generation system 1 according to an embodiment of the present invention is a modified application organic Rankine cycle in which a turbine 11 is driven to generate electricity by using a refrigerant as a heating medium The power generation module 10, the condensation module 20, the operation pump 30, the evaporation module 40, and the superheater 50 are connected to each other through a conduit (not shown) .

In order to facilitate the understanding of the high-efficiency low-temperature power generation system 1 by the evaporator according to the embodiment of the present invention, the refrigerant for R-134a refrigeration is selected as the heating medium, and the predetermined set pressure of the pre- 20kg / cm < 2 >

The set pressure of the superheater 50 is set to 17 kg / cm 2 at the same level as that of the evaporator 42 at 80 ° C or more The condensing pressure of the water-cooled condenser 22 is set to be 8 kg / cm 2 and the temperature of the heating medium is maintained at 28 ° C. or less. Hereinafter, the method will be described in detail do.

As shown in FIG. 2, the pressure-enthalpy diagram of the high-efficiency low-temperature power generation system 1 by the evaporation apparatus of the present invention will be described as follows. The section A is an adiabatic compression process by a compression pump. Is a section heated by the heat source fluid of the heat storage tank (60) in an endothermic expansion process that facilitates evaporation by reducing the pressure of the evaporator (42) by the nozzle (41) And a constant pressure heating process in which the evaporator 42 evaporates heat by the fluid.

Also, the 'd' section is a superheated steam section, which absorbs the external heat by the heat source fluid of the heat storage tank 60, and is heated by the superheated steam which is overheated to expand the volume. The heat medium is compressed, The amount of kinetic energy is increased to improve the power generation efficiency.

As an example, when a heating medium evaporated at a saturation temperature of 61 ° C under a constant pressure of 17 kg / cm 2 in a superheater 50 having a volume of 2 m 3 is overheated with a heating medium at 80 ° C, (273 + 61) K = V2 / (273 + 80) K at V1 / T1 = V2 / T2, the volume is expanded to V2 = 2.11 m 3.

The 'F' section is a process of condensing by the condensation module (20) by the static pressure and circulating by the compression pump to form the application organic Rankine cycle.

4, the low-temperature evaporation system of the high-efficiency low-temperature power generation system 1 by the evaporation apparatus by the applied organic Rankine cycle includes a preheater 43, an expansion nozzle 41, and an evaporator 42 The evaporator module 40 and the superheater 50. The evaporator module 40 is configured to circulate an external heat source stored in the heat storage tank 60 to the superheater 50, the evaporator 42, and the preheater 43, The evaporator, the superheater, and the preheater may be arranged in order of circulation of the external heat source in order of improving the power generation efficiency according to the temperature of the evaporator, the superheater, and the preheater.

4, the heat storage tank 60 is configured to store external heat sources such as solar heat, waste heat, geothermal heat or air heat. The heat source fluid of the heat storage tank 60 is supplied to the heat storage tank 60, the superheater 50, An evaporator 42 and a preheater 43 to exchange heat and a circulation line 61 is formed in the evaporator 42 and the preheater 43. The reference numeral P1 denotes a circulation pump of the circulation line 61. [

The heating medium is set to a predetermined pressure of 20 kg / cm 2 by the operation pump 30 and is circulated to the preheater 43. In the preheater 43, an external heat source is supplied through the circulation line 61 of the heat storage tank 60, Is preheated to 70 < 0 > C to receive sensible heat among the enthalpy required for evaporation.

The preheated heating medium R-134a supplied with sensible heat from the pre-heater 43 is injected at a pressure of 20 kg / cm2 by the expansion nozzle 41 in the evaporator 42, and the pressure difference with the internal set pressure of 17 kg / And absorbs the latent heat of evaporation and evaporates at low temperature.

5 (a), the evaporator 42 includes an expansion type expansion pipe WP and a housing HS. In the evaporator 42, an evaporative heat of the heating medium is generated from an external heat source of 90 deg. And an expandable expansion pipe (WP) capable of receiving a sufficient enthalpy.

The heat medium expanded in the expansion nozzle 41 is moved to the side of the superheater 50 through the expanding expansion pipe WP and the heat source fluid of the circulation line 61 flows into the inner space of the housing HS, And then flows out after heat exchange.

More specifically, when 1 kg of refrigerant is evaporated at a pressure of 17 kg / cm 2, the saturation temperature is 61 ° C., the sensible heat is 69 kcal / kg, and the latent heat is 33 kcal / kg. And the working fluid is preheated to about 60 ° C.

In the evaporator 42, the heat corresponding to the latent heat is supplied by the heat of 90 ° C or more, and the heat medium is continuously heat-evaporated while maintaining the saturation temperature of 61 ° C. In the superheater 50, Which is overheated at 61 DEG C or higher, the mechanical kinetic energy in the turbine 11 can be doubled and the power generation efficiency can be improved.

Accordingly, the pressure of the heating medium is high in the preheater 43 and low in the evaporator 42, and the superheater 50 is set to a pressure equivalent to that of the evaporator 42, so that low temperature evaporation is performed using the pressure difference of the working fluid, .

On the other hand, since the temperature of the heating medium is lower in the order of the preheater 43 and the evaporator 42 and the superheater 50, the external heat source through the circulation line 61 is maintained so that the pressure rises, Supply.

The high-efficiency low-temperature power generation system (1) according to the present invention uses a characteristic that the evaporation is a condition of evaporation and the evaporation is easy when the temperature is elevated. The preheater (43) When the pressure is reduced to 17 kg / cm 2 by the evaporator 42 through the expansion nozzle 41 at a pressure of 20 kg / cm 2, the boiling point is lowered, and the minimum heating temperature necessary for evaporation can be lowered.

In the conventional organic Rankine cycle, the minimum heating temperature required for evaporation of 1 kg of refrigerant is as follows: the latent heat of the saturated steam table is 34 kcal / kg and the specific heat is 0.4 kcal / kg ° C under the above- %, It can be understood that T = 34 / (1 * 0.4 * 0.3) = 283 ° C since T = Q / (G * C) * 0.3 at Q = G * C * T.

These calculations are based on the assumption that only the pure phase change heat due to the latent heat of evaporation is ignored in the indirect heat exchange system and the heat transfer rate of the organic Rankine system is less than 40% It is evident by the prior art that the minimum heating temperature required for actual evaporation should be higher.

On the other hand, the minimum heating temperature required for the evaporation proposed in the present invention utilizes the characteristics of the material, the temperature is raised, the pressure is lowered, and the evaporation takes place by evaporating the low temperature like the absorption type refrigeration principle and evaporating the ambient heat. Is a minimum heating temperature necessary for evaporation of 90 DEG C or more, which is 20 DEG C to 30 DEG C plus a temperature difference necessary for heat transfer, and this is the heat transfer efficiency.

This is the same principle that COP (coefficient of performance) is higher in the refrigeration cycle. It is evaporated at low temperature using the pressure difference of the heating medium and proportional to the temperature rise when the pressure is constant by Charle's law in the ideal gas- The volume of the gas expands, so that the amount of kinetic energy generated by the turbine 11 can be increased to improve the power generation efficiency.

That is, in the organic Rankine cycle of the prior art, since the temperature is increased in the closed evaporator and the property to evaporate and the pressure to increase are opposite to each other, it is necessary to have a high temperature that adds the latent heat of evaporation and the heat transfer rate, The temperature difference between the temperature and the external heat source is increased. However, in the application organic Rankine cycle of the present invention, since the pressure difference of the heating medium is increased, the heating medium is evaporated. The temperature difference is reduced.

Therefore, if the evaporation module 40 of the present invention is supplied with the required heat amount as the temperature of the external heat source plus the temperature difference of about 20 to 30 DEG C necessary for the saturation temperature and heat transfer, the heat medium continuously takes heat of the heat source fluid, It is always possible to make efficiency.

3 and 4, the power generation module 10 includes a turbine 11, a generator 12, and a control device (not shown), and generates thermal energy by converting the thermal energy into mechanical energy. The turbine 11 and the generator 12 of the organic Rankine cycle are known technologies, and a detailed description thereof will be omitted.

5 (b), in the evaporator 42, the heating medium expanded in the expansion nozzle 41 flows into the inner space of the housing HS, and the circulation line 61 flows into the inner space of the housing HS And heat exchange with the heat medium.

In other words, the heat exchanger is configured to expand into the evaporator 42 by the expansion nozzle 41, so that the inside of the evaporator 42 serves as an expansion type expansion pipe WP and the external heat source is exchanged with a tube type heat exchanger.

5 (c), the evaporator 42 may have a structure in which the pressure is relatively lowered by using a shrink tube (NP) to increase the flow velocity of the heating medium, and is evaporated using the pressure difference of the working fluid . At the rear end of the evaporator (42), an expansion nozzle (41) for expanding the volume of the working fluid is provided.

6, the condensing module 20 includes an air-cooled condenser 21, a service tank 23, a water-cooled condenser 22, and a water-cooled condensing tank 24.

The air-cooled condenser 21 is a device for first cooling the hot heating medium to the atmospheric temperature in the role of the auxiliary condenser. The cooling water is supplied to the water-cooled condenser by a separate cooling device (not shown) Lt; 0 > C or less. The reference symbol WL is a cooling water line through which cooling water flows, and P2 is a circulation pump installed in the cooling water line.

The service tank 23 is an auxiliary tank that functions to prevent a phenomenon in which the pressure is instantaneously decreased due to a decrease in the volume of the heating medium during the phase change from the gas to the liquid.

For example, when the temperature of the heating medium passing through the turbine 11 is lowered under a pressure of 8 kg / cm 2 and condensed, the volume is reduced by 32 times or more from 0.0261 m 3 / kg to 0.0008 m 3 / kg. Therefore, The condensation pressure can be maintained.

In order to realize this, it is effective to arrange a condenser tube for gradually reducing the fluid tube through which the heating medium flows, and to provide a service tank 23 filled with nitrogen gas. The service tank 23 has a structure similar to that of a sealed expansion tank that is popularized and commercialized in a pressure pump or the like, thereby facilitating condensation by reducing the pressure deviation of the heating medium.

The water-cooled condensing tank 24 further functions to cool the heat medium to be liquefied, thereby increasing the viscosity of the heat medium to be condensed and keeping the conveying ability of the compression pump constant.

7A and 7B, a high-efficiency low-temperature power generation system 1 according to another embodiment of the present invention includes a preheater 43 and an evaporator 42 which are integrated with each other Lt; / RTI >

As shown in Fig. 7 (a), the evaporation module 40 includes a housing HS, a preheating pipe PP, a shrinking pipe NP, and an expanding expansion pipe WP.

The housing (HS) forms an internal space in which the heat source fluid of the circulation line (61) flows in and flows out after circulation. The preheating pipe (PP), the shrinking pipe (NP) and the expanding expansion pipe (WP) are formed inside the housing (HS).

The heating medium flowing from the operation pump 30 flows through the preheating pipe PP and flows into the shrinking tube NP after receiving sensible heat among the evaporation enthalpy of the heating medium from the heat source fluid. The heat medium passes through the shrinking tube (NP) and decreases in pressure as the flow rate increases, absorbing the latent heat of the evaporation enthalpy of the heat medium from the heat source fluid. The heat medium having passed through the shrinking tube (NP) is heat-exchanged with the heat source fluid in the expanding expansion pipe (WP) and is expanded and discharged to the superheater (50) side.

7 (b), the evaporation module 40 may be configured to include a housing HS, a preheating pipe PP, and expansion expanding pipes WP1 and WP2.

The housing (HS) forms an internal space in which the heat source fluid of the circulation line (61) flows in and flows out after circulation. The preheating pipe (PP) and the expansion type expansion pipes (WP1, WP2) are formed inside the housing (HS).

The heating medium flowing from the operation pump 30 flows through the preheating pipe PP and flows into the expanding expansion pipes WP1 and WP2 after receiving the sensible heat among the evaporation enthalpy of the heating medium from the heat source fluid. The heating medium passes through the expanding expansion pipes WP1 and WP2 and is heat-exchanged with the heat source fluid. The latent heat is absorbed by the evaporation latent heat to be evaporated at a low temperature and discharged to the superheater 50 side.

According to the present invention, since the heating medium is heated and expanded after passing through the preheater 43 and the expansion nozzle 41, and then evaporated at a low temperature in the evaporator 42, the temperature range in which the heating medium can be generated is reduced, Efficiency low-temperature electric power generation system (1) by an evaporator composed of an applied organic Rankine cycle.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have. Accordingly, it should be understood that such modifications or alterations should not be understood individually from the technical spirit and viewpoint of the present invention, and that modified embodiments fall within the scope of the claims of the present invention.

1: low-temperature power generation system 10: power generation module
20: condensation module 30: operation pump
40: evaporation module 50: superheater
60: storage tank 11: turbine
41: expansion nozzle 21: air-cooled condenser
42: evaporator 22: water-cooled condenser
43: preheater 23: service tank
HS: Housing 24: Water-cooled condensing tank
PP: Preheating tube 61: Circulation line
NP: Shrinkage tube
WP: Expandable expansion pipe

Claims (9)

A modified application organic Rankine cycle that generates electricity by driving a turbine using a refrigerant as a heating medium, and is circulated to a stage of compression, expansion, evaporation, expansion (power generation), and condensation,
A power generation module including the turbine and the generator; A condensing module for absorbing and condensing the heat of the heating medium; An operation pump for compressing and transferring the heating medium; An evaporation module for evaporating the heating medium; And a superheater for superheating the heating medium,
The evaporation module comprises:
An expansion nozzle for expanding the volume of the heating medium; And
And an evaporator for supplying heat to the expanded heat medium to evaporate the heat medium,
Wherein the heating medium is compressed to a higher pressure than the evaporation pressure of the evaporator in the operation pump and flows into the expansion nozzle. The method according to claim 1,
Wherein the evaporation module includes a preheater formed between the operation pump and the expansion nozzle so as to receive sensible heat among evaporation enthalpy of the heat medium to supply heat to the heat medium,
Wherein the heating medium is heated and expanded after passing through the preheater and the expansion nozzle, and then the latent heat of vaporization is absorbed and evaporated at the low temperature in the evaporator. 3. The method of claim 2,
A heat storage tank for storing an external heat source of solar heat, waste heat, geothermal heat or air heat,
And a circulation line through which the heat source fluid of the heat storage tank circulates through the heat storage tank, the superheater, the evaporator, and the preheater to exchange heat is formed. The method of claim 3,
Wherein the evaporator comprises:
An expanding expansion pipe through which the heating medium expanded in the expansion nozzle moves; And
And a housing in which the expansion type expansion tube is disposed and the heat source fluid of the circulation line flows into the internal space and flows out after heat exchange with the expansion type expansion tube. The method of claim 3,
Wherein the evaporator comprises:
And a housing in which the heating medium expanded in the expansion nozzle flows into the inner space and the circulation line passes through the inner space and heat-exchanges with the heating medium. The method according to claim 1,
The condensing module includes:
An air-cooled condenser for cooling the heat medium by heat exchange with air;
A water-cooled condenser for exchanging heat with cooling water by a cooling device to cool the heating medium; And
And a service tank installed between the air-cooled condenser and the water-cooled condenser to supply nitrogen gas so as to prevent a pressure drop of the heating medium due to the volume reduction. The method according to claim 6,
The condensing module includes:
Further comprising a water-cooled condensing tank for cooling the heat medium by heat exchange with the cooling water so that the viscosity of the liquefied heat medium is increased. A modified application organic Rankine cycle that generates electricity by driving a turbine using a refrigerant as a heating medium, and is circulated to a stage of compression, expansion, evaporation, expansion (power generation), and condensation,
A power generation module including the turbine and the generator; A condenser for absorbing and condensing the heat of the heating medium; An operation pump for compressing and transferring the heating medium; An evaporation module for evaporating the heating medium; A superheater for superheating the heating medium; A heat storage tank for storing an external heat source; And a circulation line through which the heat source fluid of the heat storage tank circulates heat through the heat storage tank, the superheater, and the evaporation module,
The evaporation module comprises:
A housing through which the heat source fluid of the circulation line flows into the internal space and circulates and flows out; A preheating tube provided in the housing and moving the heating medium introduced from the operation pump to receive sensible heat among the evaporation enthalpy of the heating medium from the heat source fluid; A shrinking tube connected to the preheating tube inside the housing and lowering the pressure of the heating medium to absorb latent heat among the evaporation enthalpy of the heating medium from the heating source fluid; And an expansion type expansion tube connected to the shrinkage tube in the housing and expanding by heat exchange with the heat medium fluid. A modified application organic Rankine cycle that generates electricity by driving a turbine using a refrigerant as a heating medium, and is circulated to a stage of compression, expansion, evaporation, expansion (power generation), and condensation,
A power generation module including the turbine and the generator; A condenser for absorbing and condensing the heat of the heating medium; An operation pump for compressing and transferring the heating medium; An evaporation module for evaporating the heating medium; A superheater for superheating the heating medium; A heat storage tank for storing an external heat source; And a circulation line through which the heat source fluid of the heat storage tank circulates heat through the heat storage tank, the superheater, and the evaporation module,
The evaporation module comprises:
A housing through which the heat source fluid of the circulation line flows into the internal space and circulates and flows out; A preheating tube provided in the housing and moving the heating medium introduced from the operation pump to receive sensible heat among the evaporation enthalpy of the heating medium from the heat source fluid; And a multi-stage expanding expansion pipe connected to the preheating pipe inside the housing and performing heat exchange with the heat source fluid to expand the volume of the heating medium.
KR1020150068353A 2014-12-30 2015-05-15 High efficiency low temperature power generation system by evaporator KR20160081758A (en)

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KR20190100718A (en) * 2018-02-21 2019-08-29 정찬세 Emergency cooling and electrical supply of nuclear power plant

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KR20120039986A (en) 2010-10-18 2012-04-26 성진지오텍 주식회사 Organic rankine power generation system using waste heat of ship engines
KR101290289B1 (en) 2012-05-31 2013-07-26 한국해양대학교 산학협력단 Apparatus for ship's orc power generating system
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