Energy tower of multi-energy-form output for stepwise recovering waste heat of a gas engine

Patent metadata

Field	Value
Publication number	US-10247050-B2
Application number	US-201515739761-A
Country	US
Kind code	B2
Filing date	Jul 24, 2015
Priority date	Jul 21, 2015
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

A multi-energy-form output energy tower for stepwise recovering waste heat of a gas engine, comprising an internal combustion engine ( 1 ), wherein the present invention also comprises a steam Rankine cycle system ( 2 ) which is capable of heat exchanging with the high temperature exhaust exhausted from the IC engine ( 1 ) to make the steam turbine ( 22 ) do expansion work. An organic Rankine cycle system which is respectively heat exchanged with high temperature exhaust, jacket water and charge air which are exhausted from the IC engine ( 1 ), and with condensation heat in the steam Rankine cycle system ( 2 ) to do expansion work; a lithium bromide refrigerator ( 4 ) which uses jacket waterpart of jacket water discharged from the IC engine ( 1 ) as a heat source of the absorption cooling system for heat exchange; and a hot water heat exchanger ( 5 ) connected with a high temperature exhaust of the IC engine ( 1 ) for heating domestic water. The energy tower of the present invention adopts multiple waste heat recovering methods and combines cooling, heating and power supplying methods, which improves comprehensive energy utilization efficiency of the system and achieves the effects of energy saving and emission reduction.

First claim

What is claimed is:

1. A multi-energy-form output energy tower for stepwise recovering waste heat of a gas engine, comprising an internal combustion engine ( 1 ), wherein the present invention also comprises a steam Rankine cycle system ( 2 ) which is capable of heat exchanging with the high temperature exhaust exhausted from the IC engine ( 1 ) to make a steam turbine ( 22 ) do expansion work; an organic Rankine cycle system which is respectively heat exchanged with high temperature exhaust, jacket water, charge air which are exhausted from the IC engine ( 1 ), and condensation heat in the steam Rankine cycle system ( 2 ) to do expansion work; a lithium bromide refrigerator ( 4 ) which uses part of jacket water discharged from the IC engine ( 1 ); and a hot water heat exchanger ( 5 ) connected at the end of the high temperature exhaust for heating domestic water;
wherein the jacket water exhausted from the IC engine ( 1 ) is divided into three branches, the first branch (a) passes through a jacket water heater ( 6 ) and exchanges heat with the high temperature exhaust out of the steam Rankine cycle system ( 2 ), and then enters the generator of the lithium bromide refrigerator ( 4 ) as the heat source of the absorption cooling system, finally enters the IC engine (d) by a joint point (d); the jacket water in the second branch (b) enters the organic Rankine cycle system ( 3 ) for preheating, and then enters the IC engine ( 1 ) by a joint point (d); the jacket water in the third branch (c) enters the IC engine ( 1 ) by a joint point (d) directly.

2. The multi-energy-form output energy tower for stepwise recovering waste heat of a gas engine according to claim 1 , wherein the steam Rankine cycle system ( 2 ) comprises: a waste heat boiler ( 21 ), which can heat the water flowing through the internal to high temperature and high pressure gas; the steam turbine ( 22 ) for receiving the high temperature and high pressure gas exhausted from the waste heat boiler ( 21 ) via pipelines, which is used for doing expansion work; a first condenser ( 23 ) for receiving the gas exhausted from steam turbine ( 22 ) via pipelines, which is used for cooling and condensing the gas; a pump ( 24 ) connected with a condensed water outlet of the first condenser ( 23 ) via pipelines, which is used for pressurizing the water; the pressurized water enters the waste heat boiler ( 21 ) via pipelines for heat exchanging with high temperature exhaust exhausted from the IC engine ( 1 ) again.

3. The multi-energy-form output energy tower for stepwise recovering waste heat of a gas engine according to claim 1 , wherein the organic Rankine cycle system ( 3 ) comprises: an expansion engine ( 31 ), which performs expansion work via high temperature gaseous working medium and then exhausts low temperature gaseous working medium; a second condenser ( 32 ), which is used for cooling the organic working medium; the low temperature liquid working medium output from the second condenser ( 32 ) is divided into three liquid working medium branches via pipelines; and a working medium pump ( 33 ) arranged on the pipelines;
wherein, a first branch of the low temperature liquid working medium goes through an exhaust preheater ( 4 ) arranged at the exhausting end of the jacket water heat exchanger ( 6 ) for heating, and the high temperature liquid working medium exhausted from the exhaust preheater ( 34 ) enters a working medium joint point (e) via pipelines; a second branch of the low temperature liquid working medium goes through a charge air preheater ( 35 ) for heating by the charge air of the IC engine ( 1 ), and then enters the working medium joint point (e) via pipelines; a third branch of the low temperature liquid working medium goes through a jacket water preheater ( 36 ) for heating by the jacket water exhausted from the second branch (b) of the jacket water of the IC engine ( 1 ), and the liquid working medium exhausted from the jacket water preheater ( 36 ) enters the working medium joint point (e) via pipelines; the three branches of the low temperature liquid working medium go through the first condenser ( 23 ) in the steam Rankine cycle system ( 2 ) together to form the high temperature gaseous working medium, and then the high temperature gaseous working medium goes through the expansion engine ( 31 ) to do the expansion work, finally the working medium after expansion goes through the second condenser ( 32 ) and the working medium pump ( 33 ), starting the next cycle.

4. The multi-energy-form output energy tower for stepwise recovering waste heat of a gas engine according to claim 3 , wherein the high temperature exhaust connects with the hot water heat exchanger ( 5 ) which is used for heating domestic water, the high temperature exhaust of which goes through the exhaust preheater ( 34 ) for heat exchanging by the low temperature liquid working medium.

5. The multi-energy-form output energy tower for stepwise recovering waste heat of a gas engine according to claim 1 , wherein the lithium bromide refrigerator ( 4 ) comprises: a generator ( 41 ) which heats the dilute solution flowing through the internal thereof by the jacket water from the second branch (b), the jacket water exhausted from the generator ( 41 ) passes through the joint point (d) via pipelines and enters the IC engine ( 1 ); a part of the heated dilute solution is converted into a gaseous refrigerant which is then passed into a third condenser ( 46 ) for condensation via pipelines, the other part of the heated dilute solution is converted into a high temperature concentrated solution which is then passed into an absorber ( 44 ) for absorbing the refrigerant by passing through a solution heat exchanger ( 42 ) and a first expansion valve ( 43 ) successively; the liquid refrigerant exhausted from the third condenser ( 46 ) enters an evaporator ( 49 ) for heat exchanging the secondary refrigerant by passing through a subcooler ( 47 ) and a second expansion valve ( 48 ) successively; and the refrigerant exhausted from the evaporator ( 49 ) enters the subcooler ( 47 ) via pipelines for heat exchanging with the liquid refrigerant from the third condenser ( 46 ), and enters the absorber ( 44 ) via pipelines for absorbing the refrigerant and heat exchanging with the cooling water; the dilute solution exhausted from the absorber ( 44 ) enters the solution heat exchanger ( 42 ) via pipelines and a solution pump ( 45 ) arranged on the pipelines for heat exchanging with the concentrated solution exhausted from the generator ( 41 ), and then enters the generator ( 41 ) for heat exchanging with the jacket water flowing through the generator ( 41 ).

Assignees

• Univ Tianjin

Inventors

• Shu Gequn
• Wang Xuan
• Tian Hua
• Che Jiaqiang
• Liu Peng

Classifications

• F02G5/04 Primary

  in combination with other waste heat from combustion engines · CPC title

• F01K25/08

  using special vapours · CPC title

• F02G2260/00

  Recuperating heat from exhaust gases of combustion engines and heat from cooling circuits · CPC title

• Y02T10/166

  Cross-Sectional Technologies · mapped topic

• F01K27/02 Primary

  Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat · CPC title