阅读说明：本技术 一种有机朗肯发电机组 (Organic Rankine generator set ) 是由 查晓冬 魏辉 甘国稳 于 2020-07-29 设计创作，主要内容包括：本发明公开了一种有机朗肯发电机组,其包括蒸发器、膨胀机、冷凝器、储液罐和冷媒泵,储液罐设置在高于冷媒泵的位置,储液罐内设有冷媒,储液罐内的冷媒液面与冷媒泵的入口之间的高度差不小于2m。在储液罐的冷媒液面与冷媒泵的入口之间形成了不短于2m的冷媒液柱,该长度的冷媒液柱底部所产生的压力足以抑制冷媒泵内生成冷媒气相,有效地抑制了冷媒泵气蚀现象。(The invention discloses an organic Rankine generator set which comprises an evaporator, an expander, a condenser, a liquid storage tank and a refrigerant pump, wherein the liquid storage tank is arranged at a position higher than the refrigerant pump, a refrigerant is arranged in the liquid storage tank, and the height difference between the liquid level of the refrigerant in the liquid storage tank and the inlet of the refrigerant pump is not less than 2 m. A refrigerant liquid column not shorter than 2m is formed between the refrigerant liquid level of the liquid storage tank and the inlet of the refrigerant pump, and the pressure generated at the bottom of the refrigerant liquid column with the length is enough to inhibit the generation of a refrigerant gas phase in the refrigerant pump, thereby effectively inhibiting the cavitation phenomenon of the refrigerant pump.)

1. The organic Rankine generator set is characterized by comprising an evaporator, an expander, a condenser, a liquid storage tank and a refrigerant pump, wherein an outlet of the liquid storage tank is connected with an inlet of the refrigerant pump through a pipeline, the liquid storage tank is arranged at a position higher than the refrigerant pump, a refrigerant is arranged in the liquid storage tank, and the height difference between the liquid level of the refrigerant in the liquid storage tank and the inlet of the refrigerant pump is not less than 2 m.

2. The orc generator set of claim 1, wherein the coolant inlet of the coolant pump is disposed toward a side of the coolant pump.

3. The orc generator set of claim 1, wherein a height difference between a refrigerant liquid surface and an inlet of the refrigerant pump is 2m or greater and less than 2.5 m.

4. The orc generator set of claim 1, wherein a height difference between a refrigerant liquid level and an inlet of the refrigerant pump is 2.5m or greater and less than 3 m.

5. The orc generator set of claim 1, wherein a height difference between a refrigerant liquid surface and an inlet of the refrigerant pump is 3m or greater.

6. The orc generator set of claim 1, wherein a height difference between an outer bottom of the reservoir and the refrigerant pump inlet is no less than 2 m.

7. The organic Rankine generator set according to claim 1, further comprising a circulating water pump and a cooling tower, wherein a cooling water outlet of the condenser is communicated with an inlet of the circulating water pump, an outlet of the circulating water pump is communicated with a water inlet of the cooling tower, and a water outlet of the cooling tower is communicated with a cooling water inlet of the condenser.

8. The organic Rankine generator set according to claim 1, further comprising a gas-liquid separator and a bypass pipe, wherein the gas-liquid separator is arranged on a refrigerant outlet side of the evaporator, a liquid discharge port of the gas-liquid separator is connected with one end of the bypass pipe, and the other end of the bypass pipe is connected to the upstream of the condenser.

Technical Field

The invention relates to the field of waste heat power generation, in particular to an organic Rankine generator set.

Background

In the organic Rankine power generation, a refrigerant is sent to an evaporator for heat exchange through a refrigerant pump pressurizing pump after being cooled. Refrigerant liquid is easy to generate cavitation erosion after passing through the refrigerant pump, and the long-term operation damages the operation service life and the system stability of the refrigerant pump.

Disclosure of Invention

In order to inhibit cavitation of a refrigerant pump and prolong the service life of the refrigerant pump, the invention provides an organic Rankine generator set, which comprises an evaporator, an expander, a condenser, a liquid storage tank and the refrigerant pump, wherein an outlet of the liquid storage tank is connected with an inlet of the refrigerant pump through a pipeline, the liquid storage tank is arranged at a position higher than the refrigerant pump, refrigerant is arranged in the liquid storage tank, and the height difference between the liquid level of the refrigerant in the liquid storage tank and the inlet of the refrigerant pump is not less than 2 m.

The invention has the beneficial effects that: a refrigerant liquid column not shorter than 2m is formed between the refrigerant liquid level of the liquid storage tank and the inlet of the refrigerant pump, and the pressure generated at the bottom of the refrigerant liquid column with the length is enough to inhibit the generation of a refrigerant gas phase in the refrigerant pump, so that the cavitation phenomenon of the refrigerant pump can be effectively inhibited.

In some embodiments, the refrigerant inlet of the refrigerant pump is disposed toward a side of the refrigerant pump.

In some embodiments, the height difference between the refrigerant liquid level and the inlet of the refrigerant pump is greater than or equal to 2m and less than 2.5 m.

In some embodiments, the height difference between the refrigerant liquid level and the inlet of the refrigerant pump is greater than or equal to 2.5m and less than 3 m.

In some embodiments, the height difference between the refrigerant liquid level and the inlet of the refrigerant pump is greater than or equal to 3 m.

In some embodiments, the height difference between the outer bottom of the liquid storage tank and the refrigerant pump inlet is not less than 2 m.

In some embodiments, the cooling water system further comprises a circulating water pump and a cooling tower, wherein a cooling water outlet of the condenser is communicated with an inlet of the circulating water pump, an outlet of the circulating water pump is communicated with a water inlet of the cooling tower, and a water outlet of the cooling tower is communicated with a cooling water inlet of the condenser.

In the condenser, the cooling water cools the refrigerant gas in the condenser to form a liquid refrigerant. After flowing out of the condenser, the cooling water is pumped to a cooling tower by a circulating water pump for cooling and then flows back to the condenser.

In some embodiments, the evaporator further comprises a gas-liquid separator and a bypass pipe, the gas-liquid separator is arranged on the refrigerant outlet side of the evaporator, the liquid outlet of the gas-liquid separator is connected with one end of the bypass pipe, and the other end of the bypass pipe is connected to the upstream of the condenser.

The gas-liquid separator can separate refrigerant liquid drops in the refrigerant gas, and the refrigerant liquid drops enter the condenser from the bypass pipe, so that the refrigerant liquid drops are prevented from damaging the expansion machine.

Drawings

Fig. 1 is a schematic connection diagram of components of an organic rankine generator set according to an embodiment of the invention.

FIG. 2 is a schematic diagram of connection relations among components of an organic Rankine power generating set according to another embodiment of the invention.

Fig. 3 is a schematic diagram illustrating a positional relationship between a liquid storage tank and a refrigerant pump of the organic rankine generator set according to an embodiment of the invention.

Fig. 4 is a schematic diagram illustrating a positional relationship between a liquid storage tank and a refrigerant pump of an organic rankine generator set according to another embodiment of the invention.

Description of the symbols:

evaporator 1

Expander 2

Generator 3

Condenser 4

Liquid storage tank 5

Refrigerant pump 6

Pipe 7

Circulating water pump 8

Cooling tower 9

Gas-liquid separator 10

Bypass pipe 11

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The invention provides an organic Rankine generator set, aiming at inhibiting cavitation of a refrigerant pump and prolonging the service life of the refrigerant pump.

Referring to fig. 1 and 2, 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 sequentially connected in a closed loop manner to form a refrigerant circulation loop. The outlet of the liquid storage tank 5 is connected with the inlet of the refrigerant pump 6 through a pipeline 7, and the liquid storage tank 5 is arranged at a position higher than the refrigerant pump 6The liquid storage tank 5 is internally provided with a refrigerant, and the height difference between the refrigerant liquid level in the liquid storage tank and the inlet of the refrigerant pump 6 is not less than 2 m. For example, referring to fig. 3, the inlet of the refrigerant pump 6 is disposed toward the side of the refrigerant pump 6, the inlet of the refrigerant pump 6 is circular, and the vertical distance H between the center of the inlet and the liquid level of the refrigerant in the liquid storage tank 5 is based on the center of the inlet of the refrigerant pump 6₁Not less than 2 m.

Optionally, the height difference H between the refrigerant liquid level in the liquid storage tank 5 and the inlet of the refrigerant pump 6₁More than or equal to 2m and less than 2.5 m. Optionally, the height difference H between the refrigerant liquid level in the liquid storage tank 5 and the inlet of the refrigerant pump 6₁2.5m or more and less than 3 m. Optionally, the height difference H between the refrigerant liquid level in the liquid storage tank 5 and the inlet of the refrigerant pump 6₁Greater than or equal to 3 m.

A refrigerant liquid column not shorter 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 with the length is enough to inhibit the generation of a refrigerant gas phase in the refrigerant pump 6, and the cavitation phenomenon of the refrigerant pump 6 can be effectively inhibited.

Generally, the total amount of refrigerant in the entire organic rankine generator set is kept stable, and a certain amount of refrigerant is stored in the liquid storage tank 5. However, in some special cases, such as a fluctuation in load or a refrigerant leakage, the refrigerant amount in the receiver 5 may be lower than a normal amount. For the sake of safety, referring to fig. 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 6₂Not less than 2 m. In these embodiments, the length of the refrigerant liquid column between the receiver tank 5 and the refrigerant pump 6 is always more than 2m regardless of the rise and fall of the refrigerant liquid level in the receiver tank 5.

In some embodiments, referring to fig. 1 and fig. 2, the organic rankine generator set further includes a circulating water pump 8 and a cooling tower 9, wherein a cooling water outlet of the condenser 4 is communicated with an inlet of the circulating water pump 8, an outlet of the circulating water pump 8 is communicated with a water inlet of the cooling tower 9, and a water outlet of the cooling tower 9 is communicated with a 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 flowing out of the condenser 4, the cooling water is pumped to a cooling tower 9 by a circulating water pump 8 for cooling, and then flows back to the condenser 4.

In some embodiments, referring to fig. 2, the organic rankine generator set further includes a gas-liquid separator 10 and a bypass pipe 11, wherein the gas-liquid separator 10 is disposed at a refrigerant outlet side of the evaporator 1 and is used for separating refrigerant liquid droplets from the refrigerant gas. The liquid discharge port of the gas-liquid separator 10 is connected to one end of a 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, and may be connected upstream of the condenser 4, for example. The gas-liquid separator 10 can separate refrigerant droplets from the refrigerant gas, and the refrigerant droplets enter the condenser 4 through the bypass pipe 11, so that the refrigerant droplets are prevented from damaging the expander 2.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.