CN107940789B - A combined cooling, heating and power generation system based on movable solar collectors - Google Patents

Abstract

The invention relates to a novel combined cooling, heating and power generation system based on a movable solar heat collector, which belongs to the technical field of organic Rankine cycle. The novel combined cooling, heating and power generation system based on movable solar heat collectors includes a first-level organic Rankine cycle module, a second-level organic Rankine cycle module, a mobile solar heat collection module and an absorption refrigeration module; a first-level organic Rankine cycle module The Ken cycle module includes the first evaporator, the first steam turbine generator set, the first condenser and the first working medium pump, and the initial heat source used by the first evaporator is geothermal fluid; the secondary organic Rankine cycle module includes the second evaporator , the second steam turbine generator set, the second condenser and the second working medium pump, the second evaporator is connected with the first evaporator; the mobile solar heat collection module includes a movable solar heat collector, a thermal storage tank and a third working mass pump, the absorption refrigeration module includes a generator, a third condenser, a third evaporator, an absorber and a solution heat exchanger.

Description

A combined cooling, heating and power generation system based on movable solar collectors

technical field

The invention relates to the technical field of organic Rankine cycle, in particular to a novel combined cooling, heating and power generation system based on a movable solar heat collector.

Background technique

my country's rapid economic development has brought about energy shortages and serious environmental pollution. Among them, the utilization rate of natural energy such as geothermal energy and solar energy is low, while my country's geothermal resources are very rich, and solar energy resources are everywhere. Belonging to renewable resources, the rational use of natural resources has become an important way to alleviate energy problems.

Organic Rankine Cycle (Organic Rankine Cycle, referred to as ORC) system is a Rankine cycle system with low boiling point organic matter as the working medium. It is mainly composed of waste heat boiler or heat exchanger, steam turbine, condenser and working medium pump. Its working The principle is that the organic working medium absorbs heat from the waste heat flow in the heat exchanger to generate steam with a certain pressure and temperature. The steam enters the steam turbine and expands mechanically to do work, thereby driving the generator or dragging other power machinery. The steam discharged from the steam turbine releases heat to the cooling water in the condenser, condenses into a liquid state, and finally returns to the heat exchanger with the help of the working fluid pump, and the cycle continues in this way. Since the exhaust steam at the tail of the steam turbine still has a certain working ability, reusing it can effectively improve the efficiency of the organic Rankine cycle, and the potential of solar energy resources is huge, which can convert the exhaust steam at the tail of the steam turbine that still has a certain working ability into secondary energy. However, since the use of solar energy resources is limited to the daytime, it is necessary to design a new type of organic Rankine cycle system with a new type of combined cooling, heating and power system with collection/storage capacity, which can be used more reasonably. of natural resources.

Contents of the invention

In order to solve the problems existing in the prior art, the present invention provides a novel combined cooling, heating and power generation system based on a movable solar collector, which includes a First-level organic Rankine cycle module, two-stage organic Rankine cycle module, mobile solar heat collection module and absorption refrigeration module;

The first-stage organic Rankine cycle module includes a first evaporator, a first steam turbine generator set connected to the first evaporator, a first condenser connected to the first steam turbine generator set, and a A first working fluid pump on the pipeline between the evaporators, the initial heat source used by the first evaporator is geothermal fluid;

The two-stage organic Rankine cycle module includes a second evaporator, a second steam turbine generator set connected to the second evaporator, a second condenser connected to the second steam turbine generator set, and a second condenser arranged between the second condenser and the second steam turbine generator set. a second working fluid pump on the pipeline between the second evaporators, the second evaporator is connected to the first evaporator;

Described mobile solar heat collecting module comprises movable solar heat collector, heat storage tank, the 3rd working medium pump that is arranged on the pipeline between the water inlet of movable solar heat collector and the heat well, from movable solar heat collector The water outlet of the heat collector leads to two pipelines, namely the first pipeline and the second pipeline. The first pipeline communicates with the heat storage tank. The pipeline between the second evaporator and the first evaporator is connected, the second pipeline is provided with a second valve, the heat storage tank is connected to the second evaporator, and the heat collecting surface of the movable solar collector faces and collects heat. The heat collection angle of the surface can be adjusted;

The absorption refrigeration module includes a generator, a third condenser connected to the generator, a third evaporator connected to the third condenser, an absorber connected to the third evaporator, and the generator connected to In the solution heat exchanger and the absorber, the second condenser is connected to the generator, the hot water discharged from the second condenser enters the generator to exchange heat with the dilute solution in the generator, and the water vapor generated by the generator is After the condensed liquid is formed in the third condenser, it enters the third evaporator, and the third evaporator is cooled externally, and the water vapor formed by endothermic evaporation enters the absorber, and the concentrated solution generated by the generator passes through the third pipeline through the solution After the heat exchanger heats up, it enters the absorber, and the water vapor entering the absorber is mixed with the concentrated solution to form a dilute solution. The absorber is connected to the solution heat exchanger and the generator through the fourth pipeline, and the dilute solution After being cooled by the solution heat exchanger through the fourth pipeline, it is returned to the generator.

A flow meter is arranged on the second pipeline.

A third valve is provided on the pipeline connecting the heat storage tank and the second evaporator.

The primary organic Rankine cycle module further includes a cooling tower connected to the first condenser, and the hot water discharged from the first condenser enters the first condenser again after being cooled by the cooling tower.

The third evaporator is connected to the wastewater discharge system of the user community, and the high-temperature wastewater discharged from the wastewater discharge system enters the third evaporator;

The water vapor generated by the generator enters the third evaporator after forming condensed liquid in the third condenser to cool the high-temperature waste water discharged from the waste water discharge system, and the water vapor formed by endothermic evaporation enters the absorption The high-temperature wastewater is cooled down and then used by users again.

A fourth working medium pump is provided on the third pipeline between the generator and the solution heat exchanger.

A throttling valve is arranged on the fourth pipeline between the solution heat exchanger and the generator.

The heat flow discharged from the second evaporator is discharged into the heat well.

A fifth working medium pump is provided on the pipeline between the third condenser and the third evaporator.

The new combined cooling, heating and power generation system based on the movable solar heat collector in the present invention breaks the original single combined cooling, heating and power generation system, and makes full use of geothermal resources and solar energy resources, and uses geothermal fluid as a primary organic The initial heat source of the Ken cycle module is a secondary heat source after mixing solar resources and the initial geothermal fluid that consumes a part of the heat. The mobile solar heat collection module is controlled by the controller to adjust its reception in real time according to the angle of the local sunlight. The heat collection angle of sunlight ensures the maximum reception and utilization of solar energy resources, and at the same time stores excess heat in the heat storage tank, ensuring that the system can continuously realize the two functions of heat storage and heat release efficiently, and ensure that the system is in the absence of sunshine Or under the condition of insufficient sunshine, it still operates normally, and vigorously develops renewable resources.

Description of drawings

Fig. 1 is a structural schematic diagram of a new combined cooling, heating and power generation system based on a movable solar collector provided by the present invention.

in,

1 first evaporator, 2 first steam turbine generator set, 3 first condenser, 4 first working medium pump, 5 cooling tower, 6 second evaporator, 7 second steam turbine generator set, 8 second condenser, 9 The second working medium pump, 10 movable solar heat collector, 11 thermal storage tank, 12 heat well, 13 the third working medium pump, 14 first valve, 15 second valve, 16 flow meter, 17 third valve, 18 Generator, 19 third condenser, 20 third evaporator, 21 absorber, 22 third pipeline, 23 fifth working medium pump, 24 solution heat exchanger, 25 fourth working medium pump, 26 fourth pipeline , 27 throttles, 28 user communities.

Detailed ways

In order to solve the problems existing in the prior art, as shown in Figure 1, the present invention provides a new type of combined cooling, heating and power generation system based on a movable solar collector. The combined power generation system includes a primary organic Rankine cycle module, a secondary organic Rankine cycle module, a mobile solar heat collection module and an absorption refrigeration module;

The primary organic Rankine cycle module includes a first evaporator 1, a first steam turbine generator set 2 connected to the first evaporator 1, a first condenser 3 connected to the first steam turbine generator set 2, and a first condenser The first working medium pump 4 on the pipeline between the device 3 and the first evaporator 1, the initial heat source used by the first evaporator 1 is geothermal fluid;

In the present invention, the geothermal fluid can be underground hot water, geothermal steam or heat-carrying gas, etc., which are stored underground and whose temperature is higher than the normal value. The liquid organic working medium in 1 performs heat exchange, and the liquid organic working medium is heated to a saturated steam state and then enters the steam turbine of the first steam turbine generating set 2 to expand and work, and the output shaft of the steam turbine is connected to the generator of the first steam turbine generating set 2, Drive the generator to generate electricity for the user. The organic working medium discharged from the first steam turbine generator set 2 enters the first condenser 3 to exchange heat with the cooling water for cooling to form a liquid organic working medium. After being pressurized by the first working medium pump 4, it enters again Heat exchange is carried out in the first evaporator 1 to complete the first-order organic Rankine cycle process, wherein the source of the cooling water in the first condenser 3 can be low-temperature waste water generated in the daily life of the user, and the first condenser 3 and the cooling The tower 5 is connected, and after the low-temperature waste water exchanges heat with the organic working medium entering the first condenser 3, the discharged hot water is cooled by the cooling tower 5 and then enters the first condenser 3 again for heat exchange. The geothermal fluid as the initial heat source heats the organic working fluid in the first evaporator 1 and then discharges it from the first evaporator 1 and enters the secondary organic Rankine cycle module;

The secondary organic Rankine cycle module comprises a second evaporator 6, a second steam turbine generator set 7 connected to the second evaporator 6, a second condenser 8 connected to the second steam turbine generator set 7, and a second condenser The second working medium pump 9 on the pipeline between the device 8 and the second evaporator 6, the second evaporator 6 is connected with the first evaporator 1;

Wherein, since the geothermal fluid as the initial heat source exchanges heat with the liquid organic working medium in the first evaporator 1, the temperature of the geothermal fluid discharged from the first evaporator 1 will decrease, and become a heat flow with a certain temperature. , therefore, a mobile solar heat collection module is set for the secondary organic Rankine cycle module, so that the heat flow with a certain temperature is mixed with the supplementary heat source generated by the mobile solar heat collection module before entering the second evaporator 6 After heating up, a secondary heat source is formed and then enters the second evaporator 6 to exchange heat with the liquid organic working medium in the second evaporator 6;

Wherein, the mobile solar heat collecting module comprises a movable solar heat collector 10, a thermal storage tank 11, a third working medium pump 13 arranged on the pipeline between the water inlet of the movable solar heat collector 10 and the hot well 12 , two pipelines are drawn from the water outlet of the movable solar collector 10, which are respectively the first pipeline and the second pipeline, the first pipeline communicates with the thermal storage tank 11, and the first pipeline is provided with a first valve 14. The second pipeline communicates with the pipeline between the second evaporator 6 and the first evaporator 1. The second pipeline is provided with a second valve 15 and a flow meter 16. The heat storage tank 11 and the second evaporator 6 connection, a third valve 17 is provided on the pipeline connecting the heat storage tank 11 and the second evaporator 6, and the orientation of the heat collecting surface of the movable solar collector 10 and the heat collecting angle of the heat collecting surface can be adjusted;

The water in the hot well 12 enters the movable solar collector 10 through the water inlet of the movable solar collector 10 after being pressurized by the third working fluid pump 13, and the movable solar collector 10 converts solar radiation energy into thermal energy , to raise the temperature of the water, if the sunshine condition is better, open the first valve 14 and the second valve 15 at the same time, close the third valve 17, a part of the hot water flowing out from the outlet of the movable solar collector 10 passes through the first One pipeline enters the heat storage tank 11 for storage, and the other part enters the pipeline between the second evaporator 6 and the first evaporator 1 through the second pipeline, and is discharged from the first evaporator 1 with a certain temperature. The heat flows are mixed to form a secondary heat source and enter the second evaporator 6, wherein the first valve 14 is used to control the flow of hot water on the first pipeline, and the second valve 15 is used to control the flow of hot water on the second pipeline. When the flow of water is poor or the hot water produced by the movable solar collector 10 at night cannot meet the heat exchange requirements, close the first valve 14 and the second valve 15, stop the operation of the third working medium pump 13, and open And adjust the third valve 17 to control the hot water stored in the heat storage tank 11 to mix with the geothermal fluid discharged from the first evaporator 1 to form a secondary heat source and then enter the second evaporator 6;

Among them, the movable solar heat collector 10 is provided with multiple tracks and heat collecting plates, the heat collecting plates are used as the heat collecting surface, the heat collecting plates can slide on the tracks, and the connection between the heat collecting plates and the tracks is rotatable through 360 degrees. The shaft connection allows the heat collecting plate to rotate 360 degrees. Therefore, the orientation of the heat collecting surface and the heat collecting angle of the heat collecting surface can be adjusted in real time according to the sunshine conditions, so as to maximize the reception of solar energy resources. The movable solar collector The heater 10 is automatically regulated using a controller.

After the geothermal fluid discharged from the first evaporator 1 is mixed with the supplementary heat source generated by the mobile solar heat collection module, a secondary heat source is formed, and the secondary heat source enters the second evaporator 6 and the liquid state in the second evaporator 6 The organic working medium performs heat exchange, and the liquid organic working medium is heated to a saturated steam state and then enters the steam turbine of the second steam turbine generating set 7 to expand and work, and the output shaft of the steam turbine is connected to the generator of the second steam turbine generating set 7 to drive the generator to generate electricity For user use, the organic working medium discharged from the second steam turbine generator set 7 enters the second condenser 8 to exchange heat with the cooling water for cooling to form a liquid organic working medium, and then enters the second evaporator after being pressurized by the second working medium pump 9 6 for heat exchange, and the heat flow discharged from the second evaporator 6 is discharged to the hot well 12 to complete the two-stage organic Rankine cycle process. Low-temperature waste water, after the low-temperature waste water exchanges heat with the organic working fluid entering the second condenser 8, the discharged hot water enters the absorption refrigeration module;

The absorption refrigeration module includes a generator 18, a third condenser 19 connected to the generator 18, a third evaporator 20 connected to the third condenser 19, an absorber 21 connected to the third evaporator 20, and a generator 18 The third pipeline 22 is connected to the solution heat exchanger 24 and the absorber 21, the second condenser 8 is connected to the generator 18, and the hot water discharged from the second condenser 8 enters the generator 18 and the dilute solution in the generator 18 Heat exchange, the water vapor generated by the generator 18 is used as a refrigerant, and enters the third condenser 19, forms a condensed liquid in the third condenser 19 and then enters the third evaporator 20, and refrigerates externally in the third evaporator 20, wherein , the third evaporator 20 is connected to the wastewater discharge system of the user community 28, and the high-temperature wastewater discharged from the wastewater discharge system enters the third evaporator 20; the condensed liquid formed in the third condenser 19 enters the third evaporator 20, and the wastewater is discharged The high-temperature wastewater discharged from the system is refrigerated, and the water vapor formed by absorbing heat and evaporating enters the absorber 21, and the high-temperature wastewater is cooled and then used by the user again; the pipeline between the third condenser 19 and the third evaporator 20 is equipped with a fifth Working medium pump 23, the condensed liquid formed in the third condenser 19 enters the third evaporator 20 after being pressurized by the fifth working medium pump 23; the concentrated solution generated by the generator 18 passes through the third pipeline 22 and passes through the solution heat exchanger 24 After heating up, it enters the absorber 21, the third pipeline 22 between the generator 18 and the solution heat exchanger 24 is provided with a fourth working medium pump 25, pressurizes the concentrated solution, enters the solution heat exchanger 24, and enters the absorber 21 water vapor and concentrated solution mixed to form a dilute solution;

The absorber 21 is connected to the solution heat exchanger 24 and the generator 18 through the fourth pipeline 26, and the dilute solution flows back to the generator 18 after cooling through the solution heat exchanger 24 through the fourth pipeline 26, and is located between the solution heat exchanger 24 and the generator 18. A throttle valve 27 is provided on the fourth pipeline between the generators 18 .

The above is the entire working process of the new combined cooling, heating and power generation system based on the movable solar heat collector in the present invention. When starting up, the first-level organic Rankine cycle module is started, and combined with the mobile solar heat collector module, it is promoted together. The second-stage organic Rankine cycle module is started, and the absorption refrigeration module is finally started. When the operation is stable, the four modules work simultaneously.

The new combined cooling, heating and power generation system based on the movable solar heat collector in the present invention breaks the original single combined cooling, heating and power generation system, and makes full use of geothermal resources and solar energy resources, and uses geothermal fluid as a primary organic The initial heat source of the Ken cycle module is a secondary heat source after mixing solar resources and the initial geothermal fluid that consumes a part of the heat. The mobile solar heat collection module is controlled by the controller to adjust its reception in real time according to the angle of the local sunlight. The heat collection angle of sunlight ensures the maximum reception and utilization of solar energy resources, and at the same time stores excess heat in the heat storage tank 11, ensuring that the system can continuously and efficiently perform two functions of heat storage and heat release, and ensure that the system is in the absence of sunshine Or under the condition of insufficient sunshine, it still operates normally, and vigorously develops renewable resources.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (9)

1. A novel combined cooling, heating and power generation system based on movable solar collectors, characterized in that, the novel combined cooling, heating and power generation system based on movable solar collectors comprises a first-order organic Rankine cycle module, Two-stage organic Rankine cycle module, mobile solar collector module and absorption refrigeration module; The first-stage organic Rankine cycle module includes a first evaporator, a first steam turbine generator set connected to the first evaporator, a first condenser connected to the first steam turbine generator set, and a A first working fluid pump on the pipeline between the evaporators, the initial heat source used by the first evaporator is geothermal fluid; The two-stage organic Rankine cycle module includes a second evaporator, a second steam turbine generator set connected to the second evaporator, a second condenser connected to the second steam turbine generator set, and a second condenser arranged between the second condenser and the second steam turbine generator set. a second working fluid pump on the pipeline between the second evaporators, the second evaporator is connected to the first evaporator; Described mobile solar heat collecting module comprises movable solar heat collector, heat storage tank, the 3rd working medium pump that is arranged on the pipeline between the water inlet of movable solar heat collector and the heat well, from movable solar heat collector The water outlet of the heat collector leads to two pipelines, namely the first pipeline and the second pipeline. The first pipeline communicates with the heat storage tank. The pipeline between the second evaporator and the first evaporator is connected, the second pipeline is provided with a second valve, the heat storage tank is connected to the second evaporator, and the heat collecting surface of the movable solar collector faces and collects heat. The heat collection angle of the surface can be adjusted; The absorption refrigeration module includes a generator, a third condenser connected to the generator, a third evaporator connected to the third condenser, an absorber connected to the third evaporator, and the generator connected to In the solution heat exchanger and the absorber, the second condenser is connected to the generator, the hot water discharged from the second condenser enters the generator to exchange heat with the dilute solution in the generator, and the water vapor generated by the generator is The condensed liquid formed in the third condenser enters the third evaporator, and the third evaporator is cooled externally, and the water vapor formed by endothermic evaporation enters the absorber, and the concentrated solution produced by the generator passes through the third pipeline through the solution After the heat exchanger heats up, it enters the absorber, and the water vapor entering the absorber is mixed with the concentrated solution to form a dilute solution. The absorber is connected to the solution heat exchanger and the generator through the fourth pipeline, and the dilute solution After being cooled by the solution heat exchanger through the fourth pipeline, it is returned to the generator. 2. The new combined cooling, heating and power generation system based on movable solar heat collectors according to claim 1, wherein a flow meter is arranged on the second pipeline. 3. The new combined cooling, heating and power generation system based on movable solar heat collectors according to claim 1, characterized in that, the pipeline connecting the heat storage tank and the second evaporator is provided with a second Three valves. 4. The novel combined cooling, heating and power generation system based on movable solar collectors according to claim 1, wherein the first-stage organic Rankine cycle module also includes a cooling unit connected to the first condenser The hot water discharged from the first condenser enters the first condenser again after being cooled by the cooling tower. 5. The new combined cooling, heating and power generation system based on movable solar collectors according to claim 1, wherein the third evaporator is connected to the wastewater discharge system of the user community, and the high temperature discharged from the wastewater discharge system Wastewater enters the third evaporator; The water vapor generated by the generator enters the third evaporator after forming condensed liquid in the third condenser to cool the high-temperature waste water discharged from the waste water discharge system, and the water vapor formed by endothermic evaporation enters the absorption The high-temperature wastewater is cooled down and then used by users again. 6. The novel combined cooling, heating and power generation system based on movable solar collectors according to claim 1, characterized in that, the third pipeline between the generator and the solution heat exchanger is provided with The fourth working fluid pump. 7. The novel combined cooling, heating and power generation system based on movable solar collectors according to claim 1, characterized in that, the fourth pipeline between the solution heat exchanger and the generator is provided with Throttle valve. 8. The novel combined cooling, heating and power generation system based on movable solar heat collectors according to claim 1, wherein the heat flow discharged from the second evaporator is discharged into the thermal well. 9. The new combined cooling, heating and power generation system based on movable solar collectors according to claim 1, characterized in that, the pipeline between the third condenser and the third evaporator is provided with a first Five pumps.