Passive low temperature heat sources organic working fluid power generation method

Patent metadata

Field	Value
Publication number	US-10060302-B2
Application number	US-201615361387-A
Country	US
Kind code	B2
Filing date	Nov 26, 2016
Priority date	Oct 21, 2013
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

The present invention relates to a passive low temperature heat energy organic working fluid power generation method and system, Comprising: organic working fluid in a first evaporator and a second evaporator are heated to evaporate; when a pressure of the organic working fluid reaches a setting pressure, a self-operating pressure control valve at an outlet of the evaporator is triggered opening by a working pressure, and steam of the organic working fluid flows into a turbine, pushes the turbine to work, and drives a generator to output electric energy; after work is completed, the steam flows into a condenser to be condensed, and working steam is output in turn through the first evaporator and the second evaporator, and thus the turbine is driven continuously to work and output electric energy. Compared with the prior technology, the present invention has reliable performance, and is operated by heating and evaporating of the working fluid in a closed space to achieve increased pressure.

First claim

We claim:

1. A passive low temperature heat energy organic working fluid power generation system comprising:
a turbine,
a generator,
a coupling for connecting the turbine and the generator,
a condenser,
a liquid-storage tank,
a first evaporator,
a second evaporator,
a first self-operated pressure regulator valve,
a first self-operated liquid regulator valve,
a second self-operated pressure regulator valve,
a second self-operated liquid regulator valve,
a third self-operated liquid regulator valve,
a fourth self-operated liquid regulator valve,
a first non-return valve,
a second non-return valve,
a third non-return valve,
a heat source pipeline,
a cold source pipeline, and
a connecting pipeline;
wherein a bottom outlet of the liquid-storage tank is divided into two branches, wherein one branch is connected with a first organic working fluid channel inlet of the first evaporator through the third self-operated liquid regulator valve;
and a first organic working fluid channel outlet of the first evaporator is connected with an inlet of the turbine through the first self-operated pressure regulator valve, the second non-return valve and the connecting pipeline sequentially;
the other branch of the bottom outlet of the liquid-storage tank is connected with a second organic working fluid channel inlet of the second evaporator through the fourth self-operated liquid regulator valve; and
a second organic working fluid channel outlet of the second evaporator is connected with the inlet of the turbine through the second self-operated pressure regulator valve, the third non-return valve and the connecting pipeline sequentially;
an outlet of the turbine is connected with a third organic working fluid channel inlet of the condenser through the connecting pipeline;
a third organic working fluid channel outlet of the condenser is connected with an inlet of the liquid-storage tank through the first non-return valve;
a top of the liquid-storage tank is divided into two branches, in one branch, the top of the liquid-storage tank is connected with the first organic working fluid channel outlet of the first evaporator through the first self-operated liquid regulator valve;
and in the other branch, the top of the liquid-storage tank is connected with the second organic working fluid channel outlet of the second evaporator through the second self-operated liquid regulator valve.

2. A passive low temperature heat energy organic working fluid power generation method comprising:
a. heating a first evaporator with low temperature heat source to evaporate an organic working fluid in the first evaporator,
wherein temperature and pressure inside the first evaporator increase continually;
b. triggering a first self-operated pressure regulator valve to open when a working pressure in the first evaporator reaches a set pressure value of 0.5 to 5 MPa;
wherein the evaporated organic working fluid flows into a turbine through a second non-return valve and a connecting pipeline sequentially to push the turbine;
c. driving a generator by the turbine to rotate through a coupling and output electric energy;
wherein the evaporated organic working fluid flows into a condenser to condense; and a stable differential pressure is formed between the turbine and the condenser with the sudden decrease of volume of the evaporated organic working fluid to keep the turbine working continuously;
d. triggering the first self-operated pressure regulator valve to close when the working pressure inside the first evaporator decreases to a set pressure value lower than 0.5 MPa;
e. triggering a first self-operated liquid regulator valve and a third self-operated liquid regulator valve to open simultaneously when a liquid level of the first evaporator decreases to a set level value of 0 to 200 mm;
wherein the condensed organic working fluid in the liquid-storage tank flows into the first evaporator through the third self-operated liquid regulator valve under gravity;
f. triggering the first self-operated liquid regulator valve and the third self-operated liquid regulator valve to close simultaneously when the liquid level of the first evaporator increases to a set level value of 400 to 500 mm;
g. heating a second evaporator to evaporate the organic working fluid in the second evaporator when the first evaporator is filled with the organic working fluid, and triggering the second self-operated pressure regulator valve to open when a working pressure in the second evaporator reaches a set pressure value of 0.5 to 5 MPa;
wherein the condensed organic working fluid flows into the liquid-storage tank through a first non-return valve;
h. triggering the second self-operated pressure regulator valve to close when the working pressure in the second evaporator decreases to a set pressure value lower than 0.5 MPa;
i. triggering a second self-operated liquid regulator valve and a fourth self-operated liquid regulator valve to open simultaneously when the liquid level in the second evaporator decreases to a set level value of 0 to 200 mm;
wherein the condensed organic working fluid in the liquid-storage tank flows into the second evaporator under gravity;
j. triggering the second self-operated liquid regulator valve and the fourth self-operated liquid regulator valve to close simultaneously when the liquid level of the second evaporator increases to a set level value of 400 to 500 mm, wherein the organic working fluid in the second evaporator is to be heated for a next cycle;
wherein during filling the second evaporator with the organic working fluid and heating the organic working fluid to a working point, the working pressure in the first evaporator reaches the set pressure value of 0.5 to 5 MPa by heating to evaporate the organic working fluid; and the first evaporator and the second evaporator in turn output the evaporated organic working fluid to continuously drive the turbine and output electric energy.

3. The passive low temperature heat energy organic working fluid power generation method of claim 2 , wherein the organic working fluid comprises R245fa, R600, R600a, R141b and R142b.

4. The passive low temperature heat energy organic working fluid power generation method of claim 2 , wherein the organic working fluid in the first evaporator is heated under 60° C. to 180° C.

5. The passive low temperature heat energy organic working fluid power generation method of claim 2 , wherein the organic working fluid in the second evaporator is heated under 60° C. to 180° C.

6. The passive low temperature heat energy organic working fluid power generation method of claim 2 , wherein the temperature of the organic working fluid at an inlet of the turbine ranges from 60° C. to 180° C., and the pressure of the organic working fluid at the inlet of the turbine ranges from 0.5 MPa to 5 MPa.

7. The passive low temperature heat energy organic working fluid power generation method of claim 2 , wherein the pressure of the organic working fluid at an outlet of the turbine ranges from 0.5 MPa to 5 MPa, and the temperature of the organic working fluid at the outlet of the turbine ranges from 30° C. to 120° C.

8. The passive low temperature heat energy organic working fluid power generation method of claim 2 , wherein a position of the liquid-storage tank is 200-2000 mm higher than that of the first evaporator and the second evaporator.

9. The passive low temperature heat energy organic working fluid power generation method of claim 2 , wherein the heat source for heating the first evaporator and the second evaporator is geothermal energy, solar energy or industrial waste heat, and a heat source temperature ranges from 85° C. to 200° C.

10. The passiv

Assignees

• Univ Shanghai Jiaotong

Inventors

• Weng Yiwu
• Lv Xiaojing
• Wang Yuping
• Bo Zemin
• Sang Zhenkun
• Geng Xiaoru
• Lu Chaohao

Classifications

• F01K25/10 Primary

  the vapours being cold, e.g. ammonia, carbon dioxide, ether · CPC title

• F01K25/08

  using special vapours · CPC title

• F01K11/02

  the engines being turbines · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F01K13/02

  Controlling, e.g. stopping or starting · CPC title