阅读说明：本技术 一种有机朗肯发电机组板式换热器冷媒出口侧冷媒气液分离系统 (Refrigerant outlet side refrigerant gas-liquid separation system of plate heat exchanger of 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板式换热器冷媒出口侧冷媒气液分离系统,该系统包括气液分离器、旁路管、冷媒罐和电动阀,气液分离器设置在换热器冷媒出口侧,旁路管一端连接气液分离器的排液口,另一端连接有机朗肯发电机组的低压侧,旁路管上连接冷媒罐和设置在冷媒罐下游的电动阀,冷媒罐内设有液位开关,液位开关限定了液位上限和液位下限,液位下限高于冷媒罐的排液口,电动阀被设定为当冷媒罐内的实际冷媒液面降至液位下限时,电动阀关闭,当冷媒罐内的实际冷媒液面达到液位上限时,电动阀打开。该系统既避免了冷媒液滴进入膨胀机,也有效防止了冷媒气体进入低压侧,有助于维持系统效率和稳定性。(The invention discloses a refrigerant outlet side refrigerant gas-liquid separation system of an organic Rankine generator set plate type heat exchanger, which comprises a gas-liquid separator, a bypass pipe, a refrigerant tank and an electric valve, wherein the gas-liquid separator is arranged on the refrigerant outlet side of the heat exchanger, one end of the bypass pipe is connected with a liquid discharge port of the gas-liquid separator, the other end of the bypass pipe is connected with a low pressure side of the organic Rankine generator set, the refrigerant tank and the electric valve arranged on the downstream of the refrigerant tank are connected on the bypass pipe, a liquid level switch is arranged in the refrigerant tank, the liquid level switch limits an upper liquid level limit and a lower liquid level limit, the lower liquid level limit is higher than the liquid discharge port of the refrigerant tank, the electric valve is set to be closed when the actual refrigerant liquid level in. The system avoids the refrigerant liquid drops from entering the expansion machine, effectively prevents the refrigerant gas from entering the low-pressure side, and is beneficial to maintaining the efficiency and the stability of the system.)

1. A refrigerant outlet side refrigerant gas-liquid separation system of an organic Rankine generator set plate type heat exchanger, it is characterized by comprising a gas-liquid separator, a bypass pipe, a refrigerant tank and an electric valve, wherein the gas-liquid separator is arranged on the refrigerant outlet side of the heat exchanger, one end of the bypass pipe is connected with a liquid outlet of the gas-liquid separator, the other end of the bypass pipe is connected with the low-pressure side of the organic Rankine generator set, the bypass pipe is connected with a refrigerant tank and an electric valve arranged at the downstream of the refrigerant tank, a liquid level switch is arranged in the refrigerant tank, the liquid level switch limits an upper liquid level limit and a lower liquid level limit, the lower liquid level limit is higher than a liquid discharge port of the refrigerant tank, the electric valve is set to be closed when the actual refrigerant liquid level in the refrigerant tank is reduced to the lower limit of the liquid level, and when the actual refrigerant liquid level in the refrigerant tank reaches the upper limit of the liquid level, the electric valve is opened.

2. The refrigerant outlet side refrigerant gas-liquid separation system of the plate heat exchanger of the organic Rankine generator set according to claim 1, further comprising an expander, a generator, a condenser and a refrigerant pump, wherein the heat exchanger, the gas-liquid separator, the expander, the condenser and the refrigerant pump are connected in a closed loop manner.

3. The refrigerant outlet side refrigerant gas-liquid separation system of the organic Rankine generator set plate heat exchanger according to claim 2, further comprising a liquid storage tank, wherein a refrigerant outlet of the condenser is connected with an inlet of the liquid storage tank, and an outlet of the liquid storage tank is connected with an inlet of the refrigerant pump.

4. The refrigerant outlet side refrigerant gas-liquid separation system of the organic Rankine generator set plate heat exchanger according to claim 1, wherein the liquid level switch is a floating ball type liquid level switch, a capacitance type liquid level switch or an electronic type liquid level switch.

5. The refrigerant outlet side refrigerant gas-liquid separation system of the organic Rankine generator set plate heat exchanger according to claim 2, wherein the bypass pipe is connected to an upstream side of the condenser.

6. The refrigerant outlet side refrigerant gas-liquid separation system of the organic Rankine generator set plate heat exchanger according to claim 2, further comprising a cooling tower and a cooling water circulating pump, wherein a cooling water outlet of the condenser is connected with an inlet of the cooling water circulating pump, an outlet of the cooling water circulating pump is connected with a water inlet of the cooling tower, and a water outlet of the cooling tower is connected with a cooling water inlet of the condenser.

7. The refrigerant outlet side refrigerant gas-liquid separation system of the organic Rankine generator set plate heat exchanger according to claim 1, wherein the refrigerant tank is arranged vertically.

8. The refrigerant outlet side refrigerant gas-liquid separation system of the organic Rankine generator set plate heat exchanger according to claim 1, wherein the refrigerant tank is arranged at a position lower than the gas-liquid separator.

9. The refrigerant outlet side refrigerant gas-liquid separation system of the organic Rankine generator set plate heat exchanger according to claim 1, wherein a liquid discharge port of the refrigerant tank is located at the bottom of the refrigerant tank.

Technical Field

The invention relates to the field of waste heat power generation, in particular to a refrigerant outlet side refrigerant gas-liquid separation system of an organic Rankine generator set plate type heat exchanger.

Background

The expander, which is a core component of the organic Rankine generator set, is abnormally sensitive to impact of refrigerant liquid drops, the expander can be damaged when the impact is severe, and the refrigerant liquid drops are often generated on the refrigerant outlet side of the heat exchanger due to load change and the characteristics of the heat exchanger.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a refrigerant outlet side refrigerant gas-liquid separation system of an organic Rankine generator set plate type heat exchanger, which comprises a gas-liquid separator, a bypass pipe, a refrigerant tank and an electric valve, wherein the gas-liquid separator is arranged on the refrigerant outlet side of the heat exchanger, one end of the bypass pipe is connected with a liquid discharge port of the gas-liquid separator, the other end of the bypass pipe is connected with the low-pressure side of the organic Rankine generator set, the refrigerant tank and the electric valve arranged on the downstream of the refrigerant tank are connected to the bypass pipe, a liquid level switch is arranged in the refrigerant tank, the liquid level switch limits an upper liquid level limit and a lower liquid level limit, the lower liquid level limit is higher than the liquid discharge port of the refrigerant tank, the electric valve is set to be closed when.

The invention has the beneficial effects that: (1) refrigerant liquid drops are separated from the refrigerant gas by adopting a gas-liquid separator, and the refrigerant liquid drops enter the low-pressure side from the bypass pipe, so that the damage of an expander caused by the fact that residual refrigerant liquid drops in the refrigerant gas enter the expander is prevented; (2) the separated refrigerant liquid drops can fluctuate due to load change and fluctuation, if the bypass pipe is not controlled, when the load change fluctuates, refrigerant gas can enter a low-pressure side through the bypass pipe, and therefore the efficiency and the stability of the system are affected.

In some embodiments, the organic rankine generator set further comprises an expander, a generator, a condenser and a refrigerant pump, and the heat exchanger, the gas-liquid separator, the expander, the condenser and the refrigerant pump are connected in a closed loop manner.

In some embodiments, the organic rankine generator set further includes a liquid storage tank, the refrigerant outlet of the condenser is connected to the inlet of the liquid storage tank, and the outlet of the liquid storage tank is connected to the inlet of the refrigerant pump. The liquid storage tank is used for storing refrigerant liquid and can play a role in stabilizing the flow of the refrigerant.

In certain embodiments, the level switch is a float level switch, a capacitive level switch, or an electronic level switch.

In certain embodiments, the bypass line is connected upstream of the condenser.

In some embodiments, the organic rankine generator set further comprises a cooling tower and a cooling water circulating pump, wherein the cooling water outlet of the condenser is connected with the inlet of the cooling water circulating pump, the outlet of the cooling water circulating pump is connected with the water inlet of the cooling tower, and the water outlet of the cooling tower is connected with the cooling water inlet of the condenser. The cooling tower and the cooling water circulating pump generate circulating cooling water for cooling the refrigerant in the condenser.

In some embodiments, the coolant tank is vertically disposed. When the refrigerant tank is vertically placed, the refrigerant liquid column in the refrigerant tank is higher, and the refrigerant gas is more easily blocked.

In some embodiments, the refrigerant tank is disposed at a position lower than the gas-liquid separator. The refrigerant liquid droplets separated from the refrigerant gas by the gas-liquid separator may flow into the refrigerant tank by gravity.

In some embodiments, the liquid outlet of the refrigerant tank is located at the bottom of the refrigerant tank.

Drawings

Fig. 1 is a refrigerant outlet side refrigerant gas-liquid separation system of an organic rankine generator set plate heat exchanger according to an embodiment of the invention.

Fig. 2 is a schematic diagram of a refrigerant tank of a refrigerant outlet side refrigerant gas-liquid separation system of a plate heat exchanger of an organic rankine generator set according to an embodiment of the invention.

Fig. 3 is a refrigerant outlet side refrigerant gas-liquid separation system of an organic rankine generator set plate heat exchanger according to another embodiment of the invention.

Detailed Description

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

Referring to fig. 1 and fig. 3, the present invention provides a refrigerant outlet side refrigerant gas-liquid separation system of a plate heat exchanger of an organic rankine generator set, which includes a gas-liquid separator 1, a bypass pipe 2, a refrigerant tank 3 and an electric valve 4. The gas-liquid separator 1 is provided on the refrigerant outlet side of the heat exchanger 5. One end of the bypass pipe 2 is connected with a liquid outlet of the gas-liquid separator 1, and the other end is connected with the low-pressure side of the organic Rankine generator set. The bypass pipe 2 is connected to a refrigerant tank 3 and an electric valve 4 provided downstream of the refrigerant tank 3. Referring to fig. 2 again, a liquid level switch is arranged in the refrigerant tank 3, the liquid level switch limits an upper liquid level limit and a lower liquid level limit, and the lower liquid level limit is higher than the liquid outlet 11 of the refrigerant tank 3. The on-off of the electric valve 4 is controlled through a liquid level switch, specifically, the electric valve 4 is set to be closed when the actual refrigerant liquid level in the refrigerant tank 3 is reduced to the lower limit of the liquid level; when the actual refrigerant level in the refrigerant tank 3 reaches the upper limit of the liquid level, the electric valve 4 is opened. Preferably, the liquid discharge port of the refrigerant tank 3 is provided at the bottom of the refrigerant tank 3. The liquid level switch can be a floating ball type liquid level switch, a capacitance type liquid level switch or an electronic type liquid level switch, and can also be other types of liquid level switches. The specific positions of the lower liquid level limit and the lower liquid level limit can be set according to requirements, and are not described in detail herein.

Further, referring to fig. 1, the organic rankine generator set further includes an expander 6, a generator 7, a condenser 8 and a refrigerant pump 10, and a refrigerant side of the heat exchanger 5, the gas-liquid separator 1, the expander 6 and a refrigerant side of the condenser 8 are connected to the refrigerant pump 10 in a closed loop. One end of the bypass pipe 2 may be connected downstream of the heat exchanger 5, and the other end may be connected upstream of the condenser 8. The heat exchanger 5 of the present application, which may also be referred to as an evaporator, generally includes a refrigerant side inlet, a refrigerant outlet, a residual heat inlet, and a residual heat outlet. In the heat exchanger 5, the waste heat flow exchanges heat with the refrigerant, so that the refrigerant is evaporated to form refrigerant gas. The refrigerant gas enters the gas-liquid separator 1 for gas-liquid separation, the refrigerant gas enters the expander 6 to enable the expander 6 to do work and drive the generator 7 to run for power generation, and the separated refrigerant liquid enters the low-pressure side of the organic Rankine generator set through the bypass pipe 2 by means of gravity. The condenser 8 is used for cooling the refrigerant gas into refrigerant liquid, and the refrigerant pump 10 is used for boosting the refrigerant liquid to the heat exchanger 5 for heat exchange.

Further, referring to fig. 3, the organic rankine generator set further includes a liquid storage tank 9, the liquid storage tank 9 is disposed between the condenser 8 and the refrigerant pump 10, specifically, a refrigerant outlet of the condenser 8 is connected to an inlet of the liquid storage tank 9, and an outlet of the liquid storage tank 9 is connected to an inlet of the refrigerant pump 10. The liquid storage tank 9 is used for storing refrigerant liquid and can play a role in stabilizing the refrigerant flow.

Further, referring to fig. 3, the organic rankine generator set further includes a cooling tower 12 and a cooling water circulation pump 13. Generally, the condenser 8 includes a refrigerant-side inlet, a refrigerant-side outlet, a cooling water inlet, and a cooling water outlet. The cooling water outlet of the condenser 8 is connected with the inlet of a cooling water circulating pump 13, the outlet of the cooling water circulating pump 13 is connected with the water inlet of a cooling tower 12, and the water outlet of the cooling tower 12 is connected with the cooling water inlet of the condenser 8. The cooling water enters the condenser 8 to exchange heat with the refrigerant, so that the refrigerant gas is condensed into refrigerant liquid. The cooling water circulating pump 13 pumps the water flowing out of the condenser 8 to the cooling water circulation cooling tower 12 for cooling.

The gas-liquid separator 1 separates refrigerant droplets of a certain size range by using the characteristic that the density of the refrigerant droplets is greater than that of refrigerant gas. The refrigerant tank 3 is arranged at a position lower than the gas-liquid separator 1, refrigerant liquid drops in the refrigerant gas are discharged into the bypass pipe 2 from a liquid discharge port of the gas-liquid separator 1 by means of gravity, and enter the low-pressure side of the organic Rankine generator set along the bypass pipe 2, so that the refrigerant liquid drops are prevented from entering the expander 6 to damage the expander 6.

The separated refrigerant droplets fluctuate due to load variation and fluctuation, and if the bypass pipe 2 is not controlled, refrigerant gas is introduced into the low pressure side through the bypass pipe 2 when the load variation fluctuates, thereby affecting the system efficiency and stability.

The refrigerant tank 3 is used for storing the refrigerant liquid separated by the gas-liquid separator 1. In order to prevent refrigerant gas from entering the low-pressure side through the bypass pipe 2, a liquid level switch is arranged in the refrigerant tank 3, the liquid level switch limits an upper liquid level limit and a lower liquid level limit, and an electric valve 4 is arranged at the downstream of the refrigerant tank 3. When the liquid level of the refrigerant in the refrigerant tank 3 reaches the upper limit of the liquid level, the liquid level switch is triggered, the electric valve 4 arranged at the downstream of the refrigerant tank 3 is automatically opened at the moment, and the refrigerant liquid in the refrigerant tank 3 can enter the condenser 3. When the liquid level of the refrigerant in the refrigerant tank 3 drops to the lower liquid level limit, the liquid level switch is triggered again, and the electric valve 4 is automatically closed at the moment, so that the refrigerant liquid in the refrigerant tank 3 is prevented from entering the condenser 8. When the refrigerant liquid in the refrigerant tank 3 is accumulated to the upper limit of the liquid level again, the electric valve 4 is opened again to discharge the refrigerant liquid in the refrigerant tank 3. Because the lower limit of the liquid level limited by the liquid level switch is higher than the liquid outlet of the refrigerant tank 3, liquid refrigerant exists in the refrigerant tank 3 all the time, and refrigerant gas is prevented from entering a low-pressure side. Further, the refrigerant tank 3 is installed in a vertical state, and the liquid discharge port 11 of the refrigerant tank 3 is located at the bottom of the refrigerant tank 3. Generally, the refrigerant tank 3 is a cylindrical tank, and when the refrigerant tank 3 is placed vertically with the same amount of refrigerant in the refrigerant tank 3, the liquid column of refrigerant in the refrigerant tank 3 is higher, and the refrigerant gas is more easily blocked from passing through.

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.