CN201963504U - Medium low-temperature Stirling generating arranged of groove solar - Google Patents

Abstract

The utility model is low-temperature Stirling generating arranged of groove solar, comprising a parabolic trough spotlighting array, a line focus in strengthening specification, a heat conduction medium, nebulizer, a spray flash tank, pressure pump,a pressure control valve, a heat exchanger and reservoir,a heat storage medium, a medium low-temperature Stirling generating generator, condensing water storage devices, control valves, transfer lines, complementary boilers, concentrator array clustering PCL controller, hydraulic or worm drive. The utility model uses spray water vapor and conduction oil or fused salt for heat conduction medium. The utility model provides heat for medium low-temperature Stirling generating generator through the heat exchanger and reservoir and also drives the Stirling generating generator to concentrate solar power generating electricity. The skill belongs to solar thermal utilization.

Description

Trough solar medium and low temperature Stirling thermal power generation device

technical field

The utility model relates to a device which adopts a trough type solar energy to drive a medium and low temperature Stirling generator to realize heat concentrating power generation (CSP), and the technology belongs to the field of solar heat utilization.

Background technique

Compared with photovoltaic power generation (PV), concentrating solar power (CSP) has outstanding features such as large scale, high concentration, and high efficiency. Manufacturing costs and improving power generation efficiency have become the focus of competition between the two solar power generation technologies. Concentrating solar power (CSP) mainly has four thermal power generation modes: trough, tower, dish and reflective Fresnel, among which trough solar concentrating power has been commercialized. This technology mainly uses heat-conducting oil as the heat-transfer working medium, and after the heat is exchanged by the heat-conducting oil to generate steam, it drives a conventional turbogenerator to generate electricity. Since the working temperature of the heat transfer oil cannot be higher than 400 degrees, the improvement of the efficiency of trough solar power generation is limited. However, in recent years, Stirling technology has undergone new developments. There have been medium and low temperature Stirling generators that can work below 400 degrees. % overall efficiency. At present, the international concentrating solar power generation (CSP) field is studying the use of working fluid substitution technology to increase the temperature of the working fluid in order to improve efficiency. However, with the increase in temperature, correspondingly higher requirements are placed on key components such as heat collector tubes, resulting in Increased costs. If the power unit is replaced on the basis of the original parabolic trough solar thermal power generation, and the steam Rankine cycle power generation is changed to a mechatronic Stirling power generation, the trough solar energy can be fully utilized to store energy and the medium and low temperature Stirling power generation does not consume water. Complementary advantages can greatly reduce manufacturing and power generation costs, create favorable conditions for competition with fossil energy, and achieve energy substitution.

Contents of the invention

The utility model is a trough-type solar heat concentrating power generation device established for realizing the complementary advantages of trough-type solar energy and medium-low temperature Stirling technology.

The utility model consists of a parabolic trough concentrating array, a line-focusing enhanced heat collecting tube, a heat-conducting working medium, an atomizer, an atomization flash tank, a pressure pump, a pressure control valve, a heat exchange heat storage device, a heat storage medium, and a medium and low temperature Steiner. It is composed of Tring generator, condensate water storage, regulating valve, transmission pipeline, complementary boiler, concentrating array cluster PCL controller, hydraulic pressure or turbine worm drive, and is characterized in that: softened pure water is directly atomized for heat transfer Quality; the front end of the parabolic trough concentrating array is equipped with an atomizer, the outlet of the atomizer is connected to the inlet of the heat collector tube with focus enhancement, the outlet of the heat collector tube with line focus enhancement is connected to the inlet of the atomization flash tank, and the outlet of the atomization flash tank is connected to the next parabolic tank The condenser array is used to generate superheated steam; the outlet of the parabolic trough condenser array that generates superheated steam is connected to the inlet of the heat exchange heat storage; the outlet of the heat exchange heat storage is connected to the inlet of the condensation water storage; the atomization flash tank is equipped with an atomizer , the inlet of the atomizer is connected to the pressure pump; the other outlet of the atomization flash tank is connected to the pressure control valve, and one end of the pressure control valve is connected to the condensate water storage; the condensate water storage is connected to the pressure pump, and the outlet of the pressure pump is respectively connected to two atomizers ; Set the hot end of several Stirling generators on the corresponding interface of the heat exchange heat storage; the complementary boiler is connected in parallel between the outlet of the pressure pump and the inlet of the heat exchange heat storage; the heat storage medium is molten salt; the regulating valve set in the pipeline.

Another technical solution is to use heat transfer oil or molten salt as the heat transfer medium; the outlet of the parabolic trough concentrating array is connected to the inlet of the heat exchange heat storage device, the outlet of the heat exchange heat storage device is connected to the inlet end of the pressure pump, and the outlet end of the pressure pump is connected to the parabolic trough Concentrating array inlet; medium and low temperature Stirling generators are distributed in an array and arranged around the heat exchange heat storage; the hot end of the medium and low temperature Stirling generators is installed in the corresponding interface of the heat exchange heat storage; heat transfer oil is used The complementary boiler with working fluid is connected in parallel with the pressure pump and the heat exchange heat storage; the complementary boiler with molten salt working fluid is connected in series between the outlet of the parabolic trough concentrator array and the inlet of the heat exchange heat storage.

The metal inner tube of the line-focusing enhanced heat collection tube is an annular, or spiral, or corrugated metal inner tube with regular protrusions on the surface of the metal tube that enhances the heat transfer function, which promotes the heat exchange medium to change the heat transfer into layers. Turbulent heat transfer, and can carry an internal pressure of not less than 10Mpa; metal straight pipes can also be used when heat transfer oil or molten salt is used as the heat transfer medium.

A tubular heat exchanger is installed in the heat exchange heat storage, and a material inlet, a pressure regulating valve, and a pressure sensor are installed; if heat transfer oil or molten salt is used as the heat transfer medium, the tubular heat exchanger may not be installed, but a temperature balance stirring device shall be installed .

The pressure pump is a high temperature molten salt pump, a heat conduction oil pump or a water pump.

The atomizer is a device provided with an atomizing nozzle.

The atomizing flash tank is composed of a steam drum, an atomizing nozzle, an inlet and outlet of high-temperature steam, and an outlet of a pressure control valve.

The pressure control valve is a pressure reducing valve or a control valve capable of automatically maintaining and controlling pressure.

The complementary boiler can use biomass fuel, mineral fuel or natural gas, biogas, coal gas, coal bed methane, coal gas.

This utility model mainly has the following innovations:

1. Directly atomize the softened pure water as the heat transfer medium, and the cost is low.

2. The line-focused enhanced heat collector has the effect of enhancing heat transfer, disturbing the working fluid and destroying the steady flow layer to achieve turbulent flow, which can greatly improve the light-to-heat conversion efficiency and reduce the emissivity.

3. Heat transfer oil or molten salt can be used as both heat transfer medium and heat storage medium.

4. Stirling machine has high power generation efficiency, which can greatly reduce power generation cost.

5. Make full use of the heat storage function to ensure continuous and uninterrupted power generation and prolong the power generation time.

6. The whole device has simple structure and high reliability, and is especially suitable for distributed energy.

Description of drawings

Figure 1 is a schematic diagram of the utility model atomized water vapor thermal power generation

Fig. 2 is a schematic diagram of thermal power generation of heat conduction oil of the present invention

Figure 3 is a schematic diagram of the utility model molten salt thermal power generation

Among them, 1. Parabolic trough concentrating array, 2. Line focusing enhanced heat collector, 3. Atomizer, 4. Atomization flash tank, 5. Pressure pump, 6. Pressure control valve, 7. Heat exchange heat storage device, 8. Heat storage medium, 9. Medium and low temperature Stirling generator, 10. Condensation water storage device, 11. Regulating valve, 12. Complementary boiler

Detailed ways

Softened pure water is used as the heat transfer medium, and an atomizer is installed at the front end of the parabolic trough concentrating array. The outlet of the flash tank is connected to the next parabolic trough concentrating array to generate superheated steam; the outlet of the parabolic trough concentrating array that generates superheated steam is connected to the inlet of the heat exchange heat storage; the outlet of the heat exchange heat storage is connected to the inlet of the condensation water storage; The atomization flash tank is equipped with an atomizer, and the inlet of the atomizer is connected to a pressure pump; the other outlet of the atomization flash tank is connected to a pressure control valve, and one end of the pressure control valve is connected to a condensation water storage; the condensation water storage is connected to a pressure pump, and the pressure The outlet of the pump is respectively connected to two atomizers; the hot ends of several Stirling generators are set on the corresponding interfaces of the heat exchange heat storage; the complementary boiler is connected to the pressure pump and the inlet of the heat exchange heat storage; the heat storage medium is molten salt.

Heat transfer oil is used as the heat transfer medium, molten salt is used as the heat storage medium, the pressure pump is a high temperature heat conduction oil pump, and the heat exchange heat storage device is oil and salt heat exchange. Or directly use the heat transfer oil as the heat storage medium, but it is necessary to increase the capacity of the heat exchange heat storage.

If molten salt is used as the heat transfer medium, the tubular heat exchanger may not be installed, but it is necessary to ensure that the complementary boiler is connected in time to ensure that the device is provided with reserve heat energy in the absence of light, so as to prevent the molten salt from solidifying and damaging the entire device and equipment.

The number of Stirling generators is selected according to the scale of power generation and demand, giving full play to the advantages of distributed energy.

Claims (8)

1. low temperature Stirling thermal electric generator is strengthened heat collecting pipe, heat-conducting work medium, atomizer, atomization flash-evaporation jar, pressure pump, pressure controlled valve, heat exchange heat reservoir, heat-storage medium, middle low temperature stirling generator, condensation water storage container, modulating valve, transfer line, complementary boiler, optically focused array cluster PCL controller by parabola groove optically focused array, linear focusing in the groove type solar, hydraulic pressure or turbine and worm driver are formed, and it is characterized in that: make heat-transfer working medium after directly will softening the purified water atomizing; Parabola groove optically focused array front end is provided with atomizer, and atomizer outlet connecting line focuses on strengthens the heat collecting pipe import, and linear focusing is strengthened the heat collecting pipe outlet and connected the import of atomization flash-evaporation jar, and the outlet of atomization flash-evaporation jar connects next parabola groove optically focused array to produce superheated vapor; The parabola groove optically focused array outlet that produces superheated vapor connects heat exchange heat reservoir entrance point; Heat exchange heat reservoir outlet end connects the import of condensation water storage container; The atomization flash-evaporation jar is provided with atomizer, and the atomizer import connects pressure pump; Another outlet of atomization flash-evaporation jar connects pressure controlled valve, and pressure controlled valve one end connects the condensation water storage container; The condensation water storage container connects pressure pump, and the pressure pump outlet connects two atomizers respectively; The hot junction of several stirling generators is arranged on the interface of heat exchange heat reservoir correspondence; Complementary boiler is connected in parallel between pressure pump outlet and the import of heat exchange heat reservoir; Heat-storage medium is a fused salt; Modulating valve is arranged in the pipeline.

2. low temperature Stirling thermal electric generator in the groove type solar according to claim 1 is characterized in that: adopt conduction oil or fused salt to make heat-transfer working medium; The outlet of parabola groove optically focused array connects the import of heat exchange heat reservoir, and the outlet of heat exchange heat reservoir connects the pressure pump entrance point, and the pressure pump outlet end connects the import of parabola groove optically focused array; In the low temperature stirling generator become array-type to distribute in proper order to be arranged on heat exchange heat reservoir periphery; Middle low temperature stirling generator hot junction is installed in the interface of heat exchange heat reservoir correspondence; Adopt the complementary boiler of conduction oil working medium in parallel with pressure pump and heat exchange heat reservoir; Adopt the complementary boiler of fused salt working medium to be connected between outlet of parabola groove optically focused array and the import of heat exchange heat reservoir.

3. low temperature Stirling thermal electric generator in the groove type solar according to claim 1, it is characterized in that: the metal inner pipe that described linear focusing is strengthened heat collecting pipe is annular or the regular node metal inner pipe that raises into bud of spirality or metal tube surface with forced heat exchanging function, impel heat exchange medium to become laminar heat transfer and be turbulent heat transfer, can carry the internal pressure that is not less than 10Mpa simultaneously; Also can use metal straight pipe when adopting conduction oil or fused salt to make heat-transfer working medium.

4. low temperature Stirling thermal electric generator in the groove type solar according to claim 1 is characterized in that: in the described heat exchange heat reservoir tubular exchanger is set, material inlet, pressure regulator valve and pressure transducer are set; Adopt conduction oil or fused salt to make heat-transfer working medium tubular exchanger can be set, but the temperature balance stirring apparatus will be set.

5. low temperature Stirling thermal electric generator in the groove type solar according to claim 1 is characterized in that: described pressure pump is high-temperature melting salt pump, Heat-transfer Oil Pump or water pump.

6. low temperature Stirling thermal electric generator in the groove type solar according to claim 1 is characterized in that: described atomizer is the device that is provided with atomization spray cap.

7. low temperature Stirling thermal electric generator in the groove type solar according to claim 1 is characterized in that: described atomization flash-evaporation jar is made of drum, atomization spray cap, the import and export of high temperature steam flow, pressure controlled valve outlet end.

8. low temperature Stirling thermal electric generator in the groove type solar according to claim 1 is characterized in that: described complementary boiler can use biomass fuel, mineral substance fuel or rock gas, biogas, coal gas, coal-seam gas, coal gas.

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