[0030] The present invention will be further described in detail below in conjunction with the drawings.
[0031] In order to suppress the cavitation phenomenon of the refrigerant pump and increase the service life of the refrigerant pump, the present invention provides an organic Rankine generator set.
[0032] Please refer to figure 1 with 2 As shown, in various embodiments of the present invention, the organic Rankine generator set includes an evaporator 1, an expander 2, a generator 3, a condenser 4, a liquid storage tank 5, and a refrigerant pump 6. The refrigerant side of the evaporator 1, the expander 2, the refrigerant side of the condenser 4, the liquid storage tank 5 and the refrigerant pump 6 are connected in a closed loop to form a refrigerant circulation circuit. The outlet of the liquid storage tank 5 is connected to the inlet of the refrigerant pump 6 through a pipe 7. The liquid storage tank 5 is set higher than the refrigerant pump 6, and the liquid storage tank 5 is equipped with refrigerant. The liquid level of the refrigerant in the liquid tank is connected to the refrigerant pump. The height difference between the entrances of 6 is not less than 2m. For example, please refer to image 3 , The inlet of the refrigerant pump 6 is set toward the side of the refrigerant pump 6, the inlet of the refrigerant pump 6 is circular, and the center of the inlet of the refrigerant pump 6 is taken as the reference, and the center of the inlet is between the center of the inlet and the liquid level of the refrigerant in the liquid storage tank 5. Vertical distance H 1 Not less than 2m.
[0033] Optionally, the height difference H between the liquid level of the refrigerant in the liquid storage tank 5 and the inlet of the refrigerant pump 6 1 2m or more and less than 2.5m. Optionally, the height difference H between the liquid level of the refrigerant in the liquid storage tank 5 and the inlet of the refrigerant pump 6 1 2.5m or more and less than 3m. Optionally, the height difference H between the liquid level of the refrigerant in the liquid storage tank 5 and the inlet of the refrigerant pump 6 1 Greater than or equal to 3m.
[0034] A refrigerant liquid column of no less than 2m is formed between the refrigerant liquid level of the liquid storage tank 5 and the inlet of the refrigerant pump 6. The pressure generated at the bottom of the refrigerant liquid column of this length is sufficient to suppress the generation of refrigerant gas phase in the refrigerant pump 6 The cavitation phenomenon of the refrigerant pump 6 is effectively suppressed.
[0035] Generally speaking, the total amount of refrigerant in the entire organic Rankine generator set remains stable, and a certain amount of refrigerant is also stored in the liquid storage tank 5. However, in some special cases, such as load fluctuations or refrigerant leakage, the amount of refrigerant in the liquid storage tank 5 may be lower than the normal amount. For the sake of safety, please refer to Figure 4 , In some embodiments, the height difference H between the outer bottom of the liquid storage tank 5 and the inlet of the refrigerant pump 6 2 Not less than 2m. In these embodiments, no matter how the liquid level of the refrigerant in the liquid storage tank 5 rises and falls, the length of the refrigerant liquid column between the liquid storage tank 5 and the refrigerant pump 6 always exceeds 2 m.
[0036] In some embodiments, please refer to 1 and figure 2 The organic Rankine generator set also includes a circulating water pump 8 and a cooling tower 9. The cooling water outlet of the condenser 4 is connected to the inlet of the circulating water pump 8, and the outlet of the circulating water pump 8 is connected to the water inlet of the cooling tower 9 The water outlet of the cooling tower 9 is connected to the cooling water inlet of the condenser 4. In the condenser 4, the cooling water cools the refrigerant gas in the condenser 4 to form a liquid refrigerant. After the cooling water flows out of the condenser 4, it is pumped by the circulating water pump 8 to the cooling tower 9 for cooling, and then flows back to the condenser 4.
[0037] In some implementations, please refer to figure 2 The organic Rankine generator set also includes a gas-liquid separator 10 and a bypass pipe 11. The gas-liquid separator 10 is arranged on the refrigerant outlet side of the evaporator 1 for separating refrigerant droplets in the refrigerant gas. The discharge port of the gas-liquid separator 10 is connected to one end of the bypass pipe 11, and the other end of the bypass pipe 11 is connected to the low pressure side of the organic Rankine generator set, for example, may be connected to the upstream of the condenser 4. The gas-liquid separator 10 can separate the refrigerant droplets in the refrigerant gas, and the refrigerant droplets enter the condenser 4 from the bypass pipe 11 to prevent the refrigerant droplets from damaging the expander 2.
[0038] What has been described above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention.
