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Full-load molten salt steam generating system and control method thereof

A generation system and full-load technology, which is applied in steam generation methods using heat carriers, steam engine devices, heating devices, etc., can solve the problems that are not conducive to the economy of solar thermal power plants with heat storage, the reduction of available hours, molten salt Heat storage waste and other issues can be reduced to reduce the risk of solidification, avoid the temperature of molten salt being too low, and facilitate the control of parameters

Active Publication Date: 2017-09-22
NORTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all cause a great waste of heat storage in molten salt, reduce the utilization rate of molten salt, and reduce the usable hours of molten salt per unit, which is not conducive to the economy of solar thermal power plants with heat storage

Method used

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  • Full-load molten salt steam generating system and control method thereof
  • Full-load molten salt steam generating system and control method thereof
  • Full-load molten salt steam generating system and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The steam turbine 11 is in high-load operation, and the hydraulic fluid with a pressure of 14Mpa and a temperature of 250°C enters the system from the hydraulic fluid inlet 10 of the system, and after continuous heat exchange with molten salt in the preheater 1, evaporator 2 and superheater 4 , the temperature of the superheated steam at the superheated steam outlet 44 of the superheater is 550°C. The temperature of the molten salt in the high-temperature molten salt tank 5 is 565°C. The high-temperature molten salt pump 8 draws the high-temperature molten salt from the high-temperature molten salt tank 5 and sends it to the superheater 4 for heat exchange with water vapor. Medium temperature molten salt tank 6. The second valve 13 and the fourth valve 15 are fully opened, and the third valve 14 and the fifth valve 16 are fully closed. The temperature of the molten salt in the medium-temperature molten salt tank 6 is 430°C. The medium-temperature molten salt pump 9 dra...

Embodiment 2

[0054] The steam turbine 11 is in the transition process from high load to low load. The hydraulic fluid with a pressure of 10Mpa and a temperature of 250°C enters the system from the hydraulic fluid inlet 10 of the system, and flows continuously in the preheater 1, evaporator 2 and superheater 4. After exchanging heat with the molten salt, the temperature of the superheated steam at the superheated steam outlet 44 of the superheater is 553°C. The temperature of the molten salt in the high-temperature molten salt tank 5 is 565°C. The high-temperature molten salt pump 8 draws the high-temperature molten salt from the high-temperature molten salt tank 5 and sends it to the superheater 4 for heat exchange with water vapor. Medium temperature molten salt tank 6. The opening degrees of the second valve 13 and the fourth valve 15 are reduced, the third valve 14 is opened, and the fifth valve 16 is fully closed. The temperature of the molten salt in the medium-temperature molten sal...

Embodiment 3

[0056] The steam turbine 11 is in low-load operation, and the hydraulic fluid with a pressure of 7Mpa and a temperature of 250°C enters the system from the hydraulic fluid inlet 10 of the system, and after continuous heat exchange with molten salt in the preheater 1, evaporator 2 and superheater 4 , the temperature of the superheated steam at the superheated steam outlet 44 of the superheater is 554°C. The temperature of the molten salt in the high-temperature molten salt tank 5 is 565°C. The high-temperature molten salt pump 8 draws the high-temperature molten salt from the high-temperature molten salt tank 5 and sends it to the superheater 4 for heat exchange with water vapor. Medium temperature molten salt tank 6. The opening degree of the second valve 13 decreases, the opening degree of the third valve 14 increases, the fourth valve 15 is fully closed, and the fifth valve 16 is opened. The temperature of the molten salt in the medium-temperature molten salt tank 6 is 430°...

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Abstract

The invention discloses a full-load molten salt steam generating system and a control method thereof. The system is composed of a preheater, an evaporator, a steam drum, a superheater, a high-temperature molten salt tank, an intermediate-temperature molten salt tank, a low-temperature molten salt tank, a molten salt pump, a valve, a temperature measuring device and a flow measuring device. A water working medium passes through the preheater, the evaporator, the steam drum and the superheater in sequence to become overheated steam. High-temperature molten salt is subjected to heat exchange through the superheater and returns to the intermediate-temperature molten salt tank. Intermediate-temperature molten salt is divided into two paths and enters the evaporator or the preheater. Evaporator outlet molten salt is also divided into two paths and enters the low-temperature molten salt tank or the preheater. According to the system, the heat exchange process in the superheater, the evaporator and the preheater is decoupled, the molten salt flow passing through the superheater, the evaporator and the preheater can be controlled correspondingly by adjusting the opening degree of the valve when the load changes, and the solidification risk of the molten salt in the preheater is greatly reduced while stable steam parameter output is achieved.

Description

【Technical field】 [0001] The invention belongs to the field of solar thermal power generation, and in particular relates to a full-load molten salt steam generation system and a control method thereof. 【Background technique】 [0002] Solar thermal power generation uses solar collectors to collect solar heat, provides steam through heat exchange devices, and combines traditional turbogenerators to achieve the purpose of generating electricity. Among them, the tower-type and trough-type photothermal power generation systems that use molten salt as the heat transfer fluid and heat storage medium have the characteristics of large-capacity energy storage, and can achieve stable output of power generation at night or when solar resources are poor, so they have Very broad application prospects. [0003] Compared with photovoltaic power generation and wind power generation, load control is a major advantage of solar thermal power plants. Therefore, when the steam turbine operates u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03G6/06F01K11/02F24J2/34F24J2/07F22B1/06
CPCF01K11/02F03G6/06F22B1/06Y02E10/46
Inventor 张智博赵晓辉韩伟
Owner NORTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GROUP
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