CN203809223U - Two-loop type solar thermal power generation device - Google Patents

Abstract

A two-loop solar thermal power generation device, including a primary-loop solar heat collection subsystem that uses solar energy to heat a low-temperature working fluid to obtain a high-temperature working fluid and stores it; and uses the high-temperature working fluid to heat water and steam to generate various pressures and The high-temperature steam drives the steam turbine generator set to generate electricity in the secondary circuit steam power generation subsystem. The electronic systems operate independently and do not affect each other; the utility model can eliminate system fluctuations caused by uncontrollable factors such as changes in solar radiation intensity and cloud shading, and can realize adjustable power generation and continuous and stable power generation of steam turbine generator sets, which improves solar energy efficiency. Power generation efficiency of thermal power generation system.

Description

A two-circuit solar thermal power generation device

technical field

The utility model belongs to the technical field of solar thermal power generation, in particular to a two-circuit solar thermal power generation device.

Background technique

Solar energy is widely distributed and has huge reserves. It is a clean and renewable energy with broad application prospects. At present, there are two main forms of solar power generation technology: photovoltaic power generation and solar thermal power generation. Photovoltaic power generation uses the photovoltaic effect of semiconductor devices to directly convert solar energy into electrical energy. It has the advantages of high reliability and convenient installation and maintenance. However, the cost of photovoltaic power generation is high and the efficiency of photoelectric conversion is not high. Solar thermal power generation uses a concentrator to gather solar energy, which is absorbed by an absorber and converted into heat energy to generate high-temperature steam or gas that enters a turbogenerator unit to generate electricity. Compared with photovoltaic power generation, solar thermal power generation system has better power quality and reliable operation.

At present, solar thermal power generation technologies mainly include trough type, Fresnel type, tower type and dish type, among which the trough type, Fresnel type and tower type have all achieved commercial operation, and the dish type is in the experimental demonstration stage.

Existing solar thermal power generation systems generally use steam with one parameter to enter the steam turbine to generate electricity. The average heat absorption temperature of the heat collector is high, which increases heat loss; The power generation efficiency of the power generation system increases the operating cost.

The intensity of solar radiation is greatly affected by the environment. Factors such as alternation of day and night, weather and cloud cover will affect the collected solar energy, resulting in uncontrollable power generation of the solar thermal power generation system during operation, affecting the stability and reliability of the system operation. .

Contents of the invention

In order to overcome the shortcomings of the above-mentioned prior art, the purpose of this utility model is to provide a two-circuit solar thermal power generation device, which solves the problem of uncontrollable power generation during the operation of the solar thermal power generation system, and improves the power generation of the solar thermal power generation system. efficiency.

In order to achieve the above object, the technical solution adopted by the utility model is:

A two-circuit solar thermal power generation device, comprising:

A primary loop solar collector subsystem that uses solar energy to heat low-temperature working fluid to obtain high-temperature working fluid and store it; and

Use the high-temperature working fluid to heat water and steam to generate steam of various pressures and temperatures to drive the steam turbine generator set to generate electricity in the secondary circuit steam power generation sub-system. The solar collector subsystem continues heating.

The primary loop solar heat collection subsystem includes a low temperature storage tank 1, a high temperature storage tank 4 and a solar heat collection field 3 connected between them.

A pump 2 is arranged between the cryogenic storage tank 1 and the solar heat collection field 3 for pumping cryogenic working fluid into the solar heat collection field 3 for heating.

The secondary circuit steam power generation subsystem includes a steam turbine 15, a condenser 14, a condensed water heater 9, a deaerator 10, a low-pressure feed water pump 11, a high-pressure feed water pump 12, a low-pressure steam generator 8, a preheater 7 and High-pressure steam generator 6, the high-temperature working fluid of the primary circuit enters high-pressure steam generator 6 from high-temperature storage tank 4, then enters parallel low-pressure steam generator 8 and preheater 7, and then enters condensate heater 9, and finally becomes low temperature The working fluid returns to the low-temperature storage tank 1; the high-pressure feedwater pump 12 sends the water in the deaerator 10 to the preheater 7, and the high-pressure feedwater from the preheater 7 enters the high-pressure steam generator 6 to generate high-temperature and high-pressure superheated steam. The main steam port of the steam turbine 15 is introduced to drive power generation; the low-pressure feed water pump 11 sends the water in the deaerator 10 to the low-pressure steam generator 8 to generate low-pressure superheated steam, which is introduced into the low-pressure supplementary steam port of the steam turbine 15 to drive power generation; the outlet of the steam turbine 15 The exhausted steam enters the condenser 14, where it is condensed into water and sent to the condensed water heater 9, and then sent to the deaerator 10 after being heated in the condensed water heater 9.

A primary circuit working medium pump 5 is set between the high-pressure steam generator 6 and the high-temperature storage tank 4 ; a condensate pump 13 is set between the condenser 14 and the condensate heater 9 .

The working fluid of the primary loop solar heat collection subsystem is heat conduction oil or molten salt.

The solar heat collection field 3 is a trough type solar heat collection field, a Fresnel type solar heat collection field or a tower type solar heat collection field.

Both the condensed water heater 9 and the preheater 7 are shell-and-tube heat exchangers.

The low-pressure steam generator 8 is a direct-current spiral tube type, a horizontal U-shaped tube natural circulation type, or a vertical U-shaped tube natural circulation type; the high-pressure steam generator 6 is a direct-flow spiral tube type, a horizontal U-shaped tube natural circulation type; Circulation or vertical U-tube natural circulation.

There are two or more steams with different pressures and temperatures.

Compared with the prior art, the utility model divides the solar thermal power generation system into two loops, the first loop solar heat collection subsystem and the second loop steam power generation subsystem, these two subsystems operate independently without affecting each other, the solar The change of radiation intensity only affects the primary loop solar heat collection subsystem, and the power generation of the secondary loop steam power generation subsystem is completely controllable without being affected by the primary loop. By setting solar fields of different capacities and high-temperature storage tanks in the primary circuit, heat storage at different times can be realized, the power generation time of the system can be extended, and the utilization rate can be improved; steam of various pressures and temperatures generated by the secondary circuit can be fed into the steam turbine, which improves the efficiency of the system. Thermoelectric efficiency reduces operating costs.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

The implementation of the utility model will be described in detail below in conjunction with the accompanying drawings and examples.

As shown in Figure 1, the utility model two-circuit solar thermal power generation device, the system includes a primary circuit solar heat collection subsystem and a secondary circuit steam power generation subsystem. The solar heat collection subsystem uses the solar heat collection field 3 to focus sunlight to heat the working medium of the primary circuit, and the obtained high-temperature working medium is stored in the high-temperature storage tank 4 for use by the secondary circuit; the steam power generation subsystem of the secondary circuit uses a high-temperature storage tank The primary circuit working medium in 4 heats water and steam to generate steam of various pressures and temperatures, which are incorporated into the steam turbine 15 to drive the steam turbine generator set to generate electricity. The cooled primary circuit working medium is stored in the cryogenic storage tank 1 . The primary circuit solar heat collection subsystem and the secondary circuit steam power generation subsystem operate independently without affecting each other.

The primary circuit solar heat collection subsystem includes a low temperature storage tank 1, a high temperature storage tank 4, a solar heat collection field 3, a pump 2 and a primary circuit working fluid. Its working process is that the pump 2 pumps the primary circuit working fluid stored in the low-temperature storage tank 1 into the solar heat collecting field 3, and the solar heat collecting field 3 focuses sunlight to heat the working medium, and the heated high-temperature working medium is stored in the high-temperature storage tank. 4 in jar.

The secondary circuit steam power generation subsystem includes a steam turbine 15, a condenser 14, a condensate pump 13, a condensate heater 9, a deaerator 10, a low-pressure feed water pump 11, a high-pressure feed water pump 12, a low-pressure steam generator 8, and a preheater 7. High-pressure steam generator 6 and primary circuit working medium pump 5. Its working process is that the primary-circuit working medium pump 5 pumps the high-temperature primary-circuit working medium stored in the high-temperature storage tank 4 into the high-pressure steam generator 6, and the high-temperature primary-circuit working medium is divided into two parts after being cooled by the high-pressure steam generator 6, one part It enters the low-pressure steam generator 8, and the other part enters the preheater 7 to preheat the high-pressure feed water. After the high-pressure feed water is preheated, it enters the high-pressure steam generator 6. Two parts, one circuit, are cooled from the low-pressure steam generator 8 and the preheater 7. The working medium enters the condensed water heater 9 to heat the condensed water, and the cooled primary circuit working medium returns to the low-temperature storage tank 1 to complete the cycle of the primary circuit working medium; the condensed water pump 13 pumps the condensed water into the condensed water heater 9 for heating The final condensed water enters the deaerator 10, and the low-pressure feedwater pump 11 pumps the feedwater into the low-pressure steam generator 8 to generate low-pressure superheated steam, which is introduced into the low-pressure steam supply port of the steam turbine 15 to drive the turbogenerator to generate electricity. The high-pressure feedwater pump 12 Pump the feed water into the preheater 7, and the preheated feed water enters the high-pressure steam generator 6 to generate high-temperature and high-pressure superheated steam, which is introduced into the main steam port of the steam turbine 15 to drive the steam turbine generator set to generate electricity. After the steam works in the steam turbine 15 The exhausted steam enters the condenser 14 and condenses into water in the condenser 14 to complete the circulation of the secondary circuit working medium.

In the embodiment, the working fluid in the primary circuit can be heat transfer oil or molten salt. The solar heat collection field 3 can be a trough type solar heat collection field, a Fresnel type solar heat collection field or a tower type solar heat collection field. The condensate heater and preheater are shell and tube heat exchangers. Both the low-pressure steam generator 8 and the high-pressure steam generator 6 can be straight-through spiral tube type, horizontal U-shaped tube natural circulation type or vertical U-shaped tube natural circulation type.

In the above specific embodiments, the steam power generation sub-system generates 2 types of steam with different pressures and temperatures, but the utility model is not limited to 2 types, and can generate 2, 3, 4 or more types according to the parameters of the primary circuit working medium Steam at many different pressures and temperatures.

Claims (10)

1. two loop-type solar energy thermal-power-generating devices, is characterized in that, comprising:

A loop solar thermal-arrest subtense angle that utilizes solar energy heating cryogenic fluid to obtain high temperature refrigerant and store; And

Utilize described high temperature refrigerant heating water and steam, produce the secondary circuit steam power power generation sub-system of the steam driven Turbo-generator Set generating of multiple different pressures and temperature, the high temperature refrigerant cooling after heating continues heating for cryogenic fluid is recycled to a loop solar thermal-arrest subtense angle.

2. two loop-type solar energy thermal-power-generating devices according to claim 1, is characterized in that, a described loop solar thermal-arrest subtense angle comprises low-temperature storage tank (1), high temperature storage tank (4) and is connected in the solar energy heat-collection field (3) between the two.

3. two loop-type solar energy thermal-power-generating devices according to claim 2, is characterized in that, between described low-temperature storage tank (1) and solar energy heat-collection field (3), are provided with pump (2), in order to cryogenic fluid is pumped into solar energy heat-collection field (3) heating.

4. two loop-type solar energy thermal-power-generating devices according to claim 2, it is characterized in that, described secondary circuit steam power power generation sub-system comprises steam turbine (15), vapour condenser (14), condensation water heater (9), oxygen-eliminating device (10), low pressure feed water pump (11), high pressure water pump (12), low-pressure steam generator (8), preheater (7) and high pressure steam generator (6), one loop high temperature refrigerant enters high pressure steam generator (6) by high temperature storage tank (4), enter again low-pressure steam generator in parallel (8) and preheater (7), enter again condensation water heater (9), finally become cryogenic fluid and be back to low-temperature storage tank (1), high pressure water pump (12) is delivered to preheater (7) by the water in oxygen-eliminating device (10), and the high-pressure feed water that goes out preheater (7) enters high pressure steam generator (6), produces the superheated vapor of High Temperature High Pressure, and the main steam mouth of introducing steam turbine (15) drives generating, low pressure feed water pump (11) is delivered to low-pressure steam generator (8) by the water in oxygen-eliminating device (10), produces low-pressure superheated steam, and the low pressure filling mouth of introducing steam turbine (15) drives generating, the exhaust steam that goes out steam turbine (15) enters vapour condenser (14), condenses into therein water and delivers to condensation water heater (9), in condensation water heater (9), after heating, sends into oxygen-eliminating device (10).

5. two loop-type solar energy thermal-power-generating devices according to claim 4, is characterized in that, a loop working medium pump (5) is set between described high pressure steam generator (6) and high temperature storage tank (4); Between described vapour condenser (14) and condensation water heater (9), condensate pump (13) is set.

6. according to two loop-type solar energy thermal-power-generating devices described in the arbitrary claim of claim 1-5, it is characterized in that, the working medium of a described loop solar thermal-arrest subtense angle is conduction oil or fused salt.

7. according to two loop-type solar energy thermal-power-generating devices described in the arbitrary claim of claim 2-5, it is characterized in that, described solar energy heat-collection field (3) is groove type solar heat collecting field, Fresnel solar energy heat-collection field or tower type solar heat collecting field.

8. according to two loop-type solar energy thermal-power-generating devices described in claim 4 or 5, it is characterized in that, described condensation water heater (9) and preheater (7) are shell-and-tube heat exchanger.

9. according to two loop-type solar energy thermal-power-generating devices described in claim 4 or 5, it is characterized in that, described low-pressure steam generator (8) is direct current spiral-type, Horizontal U-shaped pipe natural recirculating type or vertical U-shaped pipe natural recirculating type; Described high pressure steam generator (6) is direct current spiral-type, Horizontal U-shaped pipe natural recirculating type or vertical U-shaped pipe natural recirculating type.

10. according to two loop-type solar energy thermal-power-generating devices described in claim 4 or 5, it is characterized in that the steam of described different pressures and temperature is 2 kinds or two or more.