Flash evaporation active control system and method adapting to solar energy organic Rankine cycle

Abstract

The invention discloses a flash evaporation active control system adapting to the solar energy organic Rankine cycle. The flash evaporation active control system comprises a solar energy trough heat collector, an organic Rankine cycle power generation system, a flash evaporation type liquid storage tank and a control device thereof. The organic Rankine cycle power generation system comprises an evaporator, an expansion machine, an electric generator, a cooling tower, a condenser and a frequency conversion type working medium pump. The control device comprises a temperature and pressure sensor, an electromagnetic valve and an expansion valve. The temperature and pressure sensor is connected with the expansion valve, the electromagnetic valve and the frequency conversion type working medium pump separately. According to flash evaporation active control system, the immediate reaction to a solar energy transient characteristic is achieved, and low-pressure saturated steam generated through flash evaporation enters a low-pressure stage of the expansion machine to adjust an organic working medium flow, so that variable working condition operation is realized, and the flash evaporation active control system is applicable to various solar intensity areas. By detecting and adjusting the organic working medium dryness of an outlet of the evaporator, the liquid impact damage to the expansion machine is avoided. The circulation property is optimized, and the circulation efficiency is improved. The safe and rapid start-stop of the organic Rankine cycle power generation system is achieved. The flash evaporation active control system is simple in structure and easy to control.

Description

technical field [0001] The invention relates to a flash evaporation active control system and strategy adapted to solar organic Rankine cycle. Background technique [0002] As a medium and low temperature heat source, solar energy has the characteristics of wide distribution, large resource potential, and unstable intensity. [0003] Combined with the characteristics of low-temperature grades of solar energy, the Organic Rankine Cycle exhibits excellent thermal performance. Combining the Organic Rankine Cycle with solar collectors, the low-temperature Organic Rankine Cycle power generation system using solar energy has great potential for application. However, the transient characteristics of solar energy have brought instability to the operation of the ORC, causing liquid hammer damage to the cycle expander and deterioration of system performance. At present, there is no good solution, and most of them only stay in the simulation stage, which limits the development and app...

AI Technical Summary

Problems solved by technology

However, the transient characteristics of solar energy have brought instability to the operation of the ORC, causing liquid hammer damage to the cycle expander and deterioration of system performance.

At present, there is no good solution, and most of them only stay in the simulation stage, which limits the development and application of solar organic Rankine cycle

[0004]The transient characteristics of solar energy affected by clouds and weather make the heat source input of the organic Rankine cycle fluctuate greatly and the steps are frequent, thus affecting the stability of the system

When the heat absorption power is insufficient, the organic working medium does not reach the saturated gas state, forming a two-phase working medium, and the liquid droplets in the organic working medium will cause liquid hammer damage to the expander, damage the expansion equipment, and reduce the expansion efficiency

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