CO2 Rankine cycle system for heavy-duty diesel engine waste heat gradient utilization

A heavy-duty diesel engine and circulation system technology, which is applied in the field of CO2 Rankine cycle system, can solve the problems of system complexity, natural cold source condensation, etc., and achieve high thermal power conversion efficiency, improved fuel utilization rate, and low pump power.

Inactive Publication Date: 2016-07-27
XI AN JIAOTONG UNIV
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, as summer ambient temperatures in most parts of the world approach or exceed CO 2 critical temperature, it is impossible to use natural cold sources to convert

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • CO2 Rankine cycle system for heavy-duty diesel engine waste heat gradient utilization
  • CO2 Rankine cycle system for heavy-duty diesel engine waste heat gradient utilization
  • CO2 Rankine cycle system for heavy-duty diesel engine waste heat gradient utilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of CO used for cascade utilization of waste heat of heavy-duty diesel engine 2 Rankine cycle system, such as figure 1 As shown, the system mainly includes a flue gas waste heat exchanger 1, a primary CO 2 Turbine 2, power equipment 3, regenerator 4, condenser 5, high-pressure pump 6, single-effect absorption refrigerator 9, flue gas water heater 11, pipelines, valves, etc.

[0042] The circulatory system mainly consists of the following two parts:

[0043] Power cycle: CO from condenser 5 2 The liquid (state point a) is first pressurized by the high-pressure pump 6 to the state point b, then heated to the state point c in the regenerator 4, and then heated to the state point d in the flue gas waste heat exchanger 1, and then enters the first stage CO 2 Turbine 2 expands to do work, which is used to generate electricity or drive other equipment. Level 1 CO 2 The exhaust gas from the turbine (state point e) is cooled to the state point m by the regenerator 4 ...

Embodiment 2

[0047] A kind of CO used for cascade utilization of waste heat of heavy-duty diesel engine 2 Rankine cycle system, such as figure 2 As shown, the system mainly includes a flue gas waste heat exchanger 1, a primary CO 2 Turbine 2, power equipment 3, regenerator 4, condenser 5, high pressure pump 6, CO 2 Heat exchanger 7, secondary CO 2 Turbine 8, single-effect absorption refrigerator 9, flue gas water heater 11, pipelines, valves, etc. The system is mainly composed of a power cycle and a refrigeration cycle, wherein the refrigeration cycle is the same as in Embodiment 1, and only the power cycle is introduced below:

[0048] Power cycle: CO from condenser 5 2 The liquid (state point a) is first pressurized to state point b by the high-pressure pump 6, and then enters the regenerator 4 to absorb secondary CO 2 Turbine 8 and CO 2The exhaust gas waste heat of the heat exchanger 7 is heated up to the state point c, and then divided into two paths. The first path is heated to...

Embodiment 3

[0051] A kind of CO used for cascade utilization of waste heat of heavy-duty diesel engine 2 Rankine cycle system, such as image 3 As shown, the system mainly includes a flue gas waste heat exchanger 1, a primary CO 2 Turbine 2, power equipment 3, regenerator 4, condenser 5, high-pressure pump 6, double-effect absorption refrigerator 10, flue gas water heater 11, circulating water pump 12, pipelines, valves, etc. The system is mainly composed of a power cycle and a refrigeration cycle, wherein the power cycle is the same as in Embodiment 1, and only the refrigeration cycle is introduced below:

[0052] Refrigeration cycle: In order to improve the refrigeration coefficient of the refrigerator, the single-effect absorption refrigerator 9 in the first embodiment is replaced by a double-effect absorption refrigerator 10 in this cycle. Therefore, in addition to the low-temperature heat source in Embodiment 1, a set of medium-temperature hot water self-circulation circuit driven ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a CO2 Rankine cycle system for heavy-duty diesel engine waste heat gradient utilization. The CO2 Rankine cycle system is a special CO2 Rankine cycle system with CO2 serving as a working medium, waste heat of diesel engine high-temperature flue gas serving as a heat source, and a waste heat driving absorption refrigeration product of diesel engine cooling system hot water serving as a cold source. The CO2 Rankine cycle system is mainly composed of a flue gas waste heat exchanger, CO2 turbines, power equipment, a regenerator, a condenser, a high-pressure pump, a flue gas water heater and an absorption refrigerator. The characteristic that the condensation enthalpy of the CO2 working medium near the critical point is reduced is skillfully utilized; and the efficiency of conversion of heat into power is higher than that of an ORC cycle or other cycles and is obtained through a special cascade stage combined cycle formed by high and low grade waste heat, so that the fuel oil use ratio of a diesel engine is increased by 18%-25% or above. The CO2 Rankine cycle system for heavy-duty diesel engine waste heat gradient utilization is capable of achieving waste heat power generation/driving, heat supply and refrigeration poly-generation and has remarkable economic benefits, social benefits and application prospects.

Description

technical field [0001] The invention belongs to the field of mechanical engineering and energy saving, and in particular relates to a CO 2 Rankine cycle system. Background technique [0002] Heavy-duty diesel engines are the main power equipment for ships, ships, oil exploration and distributed power generation, and consume a large amount of oil resources every year. However, affected by various factors, the power output work of heavy-duty diesel engines in actual operation only accounts for 40-50% of the total heat of fuel combustion, and the rest of the fuel energy is dissipated into the atmosphere through exhaust gas, cooling system and lubricating oil system. . Among them, the heat energy contained in the tail gas accounts for about half of the total waste heat energy, and the temperature can reach 250-500 °C. The power efficiency of the gas turbine is lower, usually within 40%, and its exhaust energy is higher and the temperature is higher. Efficient use of these wa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): F01K25/10F02G5/04F25B29/00
CPCF01K25/103F02G5/04F25B29/006F02G2260/00Y02E20/14Y02T10/12
Inventor 王顺森吴闯颜晓江程上方刘观伟
Owner XI AN JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap