阅读说明：本技术 一种防止有机朗肯发电机组膨胀机涡轮超速运行的发电系统 (Power generation system for preventing turbine of expansion machine of organic Rankine generator set from running at overspeed ) 是由 查晓冬 魏辉 甘国稳 于 2020-07-29 设计创作，主要内容包括：本发明公开了一种防止有机朗肯发电机组膨胀机涡轮超速运行的发电系统,包括蒸发器、膨胀机、发电机、冷凝器、冷媒泵、旁通管和超级电容,蒸发器的冷媒侧、膨胀机、冷凝器的冷媒侧以及冷媒泵闭环连接,膨胀机的涡轮轴与发电机的转子连接,蒸发器与膨胀机之间设有电动阀。当市电停电后,由超级电容向电动阀供电,电动阀关断通向膨胀机的管路,阻止冷媒气体进入膨胀机,防止膨胀机的涡轮超速,过剩的冷媒气体经旁通管进入有机朗肯循环系统的低压侧。(The invention discloses a power generation system for preventing an expansion machine turbine of an organic Rankine generator set from running at an overspeed, which comprises an evaporator, an expansion machine, a power generator, a condenser, a refrigerant pump, a bypass pipe and a super capacitor, wherein the refrigerant side of the evaporator, the expansion machine, the refrigerant side of the condenser and the refrigerant pump are connected in a closed loop mode, a turbine shaft of the expansion machine is connected with a rotor of the power generator, and an electric valve is arranged between the evaporator and the expansion machine. When the commercial power is cut off, the super capacitor supplies power to the electric valve, the electric valve cuts off a pipeline leading to the expansion machine, refrigerant gas is prevented from entering the expansion machine, the turbine of the expansion machine is prevented from being overspeed, and surplus refrigerant gas enters the low-pressure side of the organic Rankine cycle system through the bypass pipe.)

1. The utility model provides a prevent power generation system of organic rankine generator set expander turbine overspeed operation which characterized in that, includes evaporimeter, expander, generator, condenser, refrigerant pump, bypass pipe and super capacitor, the refrigerant side of evaporimeter, expander, the refrigerant side of condenser and refrigerant pump closed loop are connected, the turbine shaft of expander with the rotor of generator is connected, the evaporimeter with be equipped with electronic three-way valve between the expander, the one end of bypass pipe is connected to the export of electronic three-way valve, and the other end is connected to the upper reaches of condenser, super capacitor electric connection electronic three-way valve, super capacitor is used for under the condition of commercial power outage to electronic three-way valve power supply.

2. The power generation system for preventing the turbine of the expansion machine of the organic Rankine generator set from running at an excessive speed according to claim 1, further comprising a liquid storage tank, wherein a refrigerant inlet of the liquid storage tank is connected with a refrigerant outlet of the condenser, and a refrigerant outlet of the liquid storage tank is connected with a refrigerant inlet of the refrigerant pump.

3. The power generation system for preventing turbine over-speed operation of an expander of an organic Rankine generator set according to claim 1, 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.

4. The system of claim 1, wherein a contactor is electrically connected to the circuit formed by the super capacitor and the electric three-way valve, and contacts of the contactor are opened when an electromagnetic coil of the contactor is energized.

5. The utility model provides a prevent power generation system of organic rankine generator set expander turbine overspeed operation which characterized in that, includes evaporimeter, expander, generator, condenser, refrigerant pump, bypass pipe and super capacitor, the refrigerant side of evaporimeter, expander, the refrigerant side of condenser and refrigerant pump closed loop are connected, the turbine shaft of expander with the rotor of generator is connected, the evaporimeter with be equipped with the shut-off valve between the expander, bypass pipe one end is connected the upper reaches of shut-off valve, and the other end is connected the upper reaches of condenser, be equipped with the bypass valve on the bypass pipe, super capacitor electric connection shut-off valve and bypass valve, super capacitor is used for under the condition of commercial power outage to shut-off valve and bypass valve power supply.

6. The power generation system for preventing over-speed operation of an organic Rankine generator set expander turbine according to claim 4, wherein the shut-off valve and the bypass valve are electric two-way valves.

7. The power generation system for preventing the turbine of the expansion machine of the organic Rankine generator set from running at an excessive speed according to claim 4, further comprising a liquid storage tank, wherein a refrigerant inlet of the liquid storage tank is connected with a refrigerant outlet of the condenser, and a refrigerant outlet of the liquid storage tank is connected with a refrigerant inlet of the refrigerant pump.

8. The power generation system for preventing turbine over-speed operation of an expansion machine of an organic Rankine generator set according to claim 4, wherein the electric actuator of the shutoff valve and the electric actuator of the bypass valve are connected in parallel, a contactor is further electrically connected to a circuit formed by the super capacitor, the electric actuator of the shutoff valve and the electric actuator of the bypass valve, and contacts of the contactor are kept open when an electromagnetic coil of the contactor is energized.

Technical Field

The invention relates to the field of waste heat power generation, in particular to a power generation system for preventing an expansion machine turbine of an organic Rankine power generator set from running at an overspeed.

Background

Each turboexpander has its own rated speed, and when it is operated at a speed exceeding the rated speed, damage to the turbine is likely to occur. In the emergency shutdown stage of the unit, the power source is lost when the valve is closed due to power failure, and during the period that the unit stops generating power and the valve cannot be closed due to power failure of a mains supply, a refrigerant still enters the turbine of the expansion machine, so that the turbine is easily overspeed, and the turbine is damaged.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a power generation system for preventing an expansion machine turbine of an organic Rankine power generator set from running in an overspeed mode, which comprises an evaporator, an expansion machine, a power generator, a condenser, a refrigerant pump, a bypass pipe and a super capacitor, wherein the refrigerant side of the evaporator, the refrigerant side of the expansion machine and the refrigerant pump are connected in a closed loop mode, a turbine shaft of the expansion machine is connected with a rotor of the power generator, an electric three-way valve is arranged between the evaporator and the expansion machine, one end of the bypass pipe is connected to an outlet of the electric three-way valve, the other end of the bypass pipe is connected to the upstream of the condenser, the super capacitor is electrically connected with the.

The beneficial effects of the embodiment are as follows: the outlet of the electric three-way valve, which is connected with the expander, is normally open, the other outlet of the electric three-way valve is normally closed, a refrigerant pipeline from the evaporator to the expander is smooth in the normal power generation process of the generator, and refrigerant gas flowing out of the evaporator can normally enter the expander; when the commercial power is cut off, the super capacitor is used as a power supply source of the electric three-way valve, the electric three-way valve closes a refrigerant passage entering the expander and opens a refrigerant passage entering the bypass pipe, refrigerant gas is prevented from entering a turbine of the expander, overspeed of the turbine is prevented, and the refrigerant gas enters the condenser from the bypass pipe.

In some embodiments, the refrigerant pump further comprises a liquid storage tank, a refrigerant inlet of the liquid storage tank is connected with the refrigerant outlet of the condenser, and a refrigerant outlet of the liquid storage tank is connected with the refrigerant inlet of the refrigerant pump. The liquid storage tank can be used for storing refrigerant liquid and can play a role in adjusting the amount of the refrigerant in the system.

In some embodiments, the cooling tower and the cooling water circulating pump are further included, 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. In the condenser, cooling water exchanges heat with the refrigerant in the condenser to condense the refrigerant into liquid refrigerant, the cooling water is pumped to the cooling pump for cooling through the cooling water circulating pump after flowing out of the condenser, and the cooled cooling water flows back to the condenser again.

In some embodiments, a contactor is electrically connected to the circuit formed by the super capacitor and the electric three-way valve, and the contact of the contactor is opened when the electromagnetic coil of the contactor is electrified.

The invention provides another form of power generation system for preventing an expansion machine turbine of an organic Rankine generator set from running in an overspeed mode, which comprises an evaporator, an expansion machine, a power generator, a condenser, a refrigerant pump, a bypass pipe and a super capacitor, wherein the refrigerant side of the evaporator, the refrigerant side of the expansion machine, the refrigerant side of the condenser and the refrigerant pump are connected in a closed loop mode, a turbine shaft of the expansion machine is connected with a rotor of the power generator, a shut-off valve is arranged between the evaporator and the expansion machine, one end of the bypass pipe is connected to the upstream of the shut-off valve, the other end of the bypass pipe is connected to the upstream of the condenser, the bypass pipe is provided with a bypass valve, the super capacitor is electrically connected with the shut.

The beneficial effects of the embodiment are as follows: the shutoff valve is normally open, the bypass valve is normally closed, when the mains supply is powered off, the super capacitor supplies power to the shutoff valve and the bypass valve, the shutoff valve closes a refrigerant passage to the expander, the bypass valve opens the refrigerant passage to the bypass pipe, refrigerant gas is prevented from entering the turbine of the expander, turbine overspeed is prevented, and the refrigerant gas enters the condenser from the bypass pipe.

In certain embodiments, the shutoff valve and the bypass valve are electrically-operated two-way valves.

In some embodiments, the refrigerant pump further comprises a liquid storage tank, a refrigerant inlet of the liquid storage tank is connected with the refrigerant outlet of the condenser, and a refrigerant outlet of the liquid storage tank is connected with the refrigerant inlet of the refrigerant pump. The liquid storage tank can be used for storing refrigerant liquid and can play a role in adjusting the amount of the refrigerant in the system.

In some embodiments, the cooling tower and the cooling water circulating pump are further included, 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. In the condenser, cooling water exchanges heat with the refrigerant in the condenser to condense the refrigerant into liquid refrigerant, the cooling water is pumped to the cooling pump for cooling through the cooling water circulating pump after flowing out of the condenser, and the cooled cooling water flows back to the condenser again.

In some embodiments, the electric actuator of the shut-off valve and the electric actuator of the bypass valve are connected in parallel, a contactor is electrically connected in a circuit formed by the super capacitor, the electric actuator of the shut-off valve and the electric actuator of the bypass valve, and contacts of the contactor are kept open when an electromagnetic coil of the contactor is energized.

Drawings

Fig. 1 is a schematic diagram of a power generation system for preventing an expansion machine turbine of an organic rankine generator set from running at an overspeed according to an embodiment of the invention.

Fig. 2 is a schematic diagram of electrical connections of the super capacitor, the electric three-way valve and the contactor in the power generation system shown in fig. 1.

FIG. 3 is a schematic diagram of a power generation system for preventing over-speed operation of an expansion machine turbine of an organic Rankine power generator set according to an embodiment of the invention.

FIG. 4 is a schematic diagram of the electrical connections of the super capacitor, the shut-off valve, the bypass valve, and the contactor in the power generation system shown in FIG. 3.

Detailed Description

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