CN106499550A - A kind of marine low speed EGR cooler for diesel S CO2 circulate bootstrap system - Google Patents
A kind of marine low speed EGR cooler for diesel S CO2 circulate bootstrap system Download PDFInfo
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- CN106499550A CN106499550A CN201611061025.8A CN201611061025A CN106499550A CN 106499550 A CN106499550 A CN 106499550A CN 201611061025 A CN201611061025 A CN 201611061025A CN 106499550 A CN106499550 A CN 106499550A
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- 239000003546 flue gas Substances 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000003517 fume Substances 0.000 claims 3
- 239000000446 fuel Substances 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 8
- 239000002918 waste heat Substances 0.000 abstract description 6
- 239000002253 acid Substances 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000000498 cooling water Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
- F02G5/02—Profiting from waste heat of exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G2250/00—Special cycles or special engines
- F02G2250/03—Brayton cycles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
本发明的目的在于提供一种船舶低速柴油机EGR冷却器S‑CO2循环余热利用系统，S‑CO2回路的超临界CO2布雷顿循环吸收EGR冷却器中排气的能量，并将排气温度降低到排气酸露点温度之上或通过采用耐腐蚀材料，排气可以冷却到酸露点以下。从EGR冷却器工质侧排出的高温高压超临界CO2气体则进入膨胀机做功，并通过轴带发电机发电。膨胀机排出的S‑CO2则进入回热器对回热器低温侧S‑CO2进行预热之后进入冷却器冷却。从冷却器排出的S‑CO2则进入压缩机压缩提高压力，并通过回热器预热之后进入EGR冷却器加热，完成整个循环。本发明有效地回收了船舶低速柴油机EGR冷却器的高温烟气能量，缓解了大型船舶低速柴油机采用EGR技术会导致油耗升高的问题。
The object of the present invention is to provide a kind of marine low-speed diesel engine EGR cooler S- CO Circulation waste heat utilization system, the supercritical CO of S- CO loop Brayton cycle absorbs the energy of the exhaust in the EGR cooler, and the temperature of the exhaust The exhaust gas can be cooled below the acid dew point by cooling above the exhaust acid dew point temperature or by using corrosion resistant materials. The high-temperature and high-pressure supercritical CO 2 gas discharged from the working medium side of the EGR cooler enters the expander to do work, and generates electricity through the shaft generator. The S-CO 2 discharged from the expander enters the regenerator to preheat the S-CO 2 on the low-temperature side of the regenerator, and then enters the cooler for cooling. The S-CO 2 discharged from the cooler enters the compressor to compress and increase the pressure, and after being preheated by the regenerator, enters the EGR cooler to be heated to complete the whole cycle. The invention effectively recovers the high-temperature flue gas energy of the EGR cooler of the marine low-speed diesel engine, and alleviates the problem of high fuel consumption caused by the adoption of the EGR technology of the large-scale marine low-speed diesel engine.
Description
技术领域technical field
本发明涉及的是一种余热回收系统，具体地说是船舶柴油机余热回收系统。The invention relates to a waste heat recovery system, in particular to a ship diesel engine waste heat recovery system.
背景技术Background technique
应用EGR技术能够有效的解决船舶低速柴油机NOx的排放问题，使船舶满足TierIII排放法规的要求。然而，该技术由于将船舶低速柴油机排放的废气重新导入气缸内燃烧，导致柴油机燃烧变差，油耗增加。有研究表明，在船舶低速柴油机EGR率为27％的情况下，能够使船舶低速柴油机满足Tier III排放标准，但油耗会增加4g/kWh，使柴油机的经济性变差。将EGR技术和S-CO2技术相结合能够同时有效地解决船舶低速柴油机污染物NOx排放和能耗两大问题。通过S-CO2技术将EGR冷却器的能量进行回收，将其转化为电能，能够有效的降低船舶低速柴油机的综合油耗，提高船舶低速柴油机的燃油经济性，抵消船舶低速柴油机采用EGR技术处理污染物排放问题时所带来的油耗增加问题。The application of EGR technology can effectively solve the NOx emission problem of marine low-speed diesel engines, so that ships can meet the requirements of TierIII emission regulations. However, this technology reintroduces the exhaust gas emitted by the ship's low-speed diesel engine into the cylinder for combustion, resulting in poor combustion of the diesel engine and increased fuel consumption. Studies have shown that when the EGR rate of a marine low-speed diesel engine is 27%, the marine low-speed diesel engine can meet Tier III emission standards, but the fuel consumption will increase by 4g/kWh, which will make the diesel engine's economy worse. The combination of EGR technology and S-CO 2 technology can effectively solve the two major problems of marine low-speed diesel engine NOx emissions and energy consumption. The energy of the EGR cooler is recovered by S-CO 2 technology and converted into electric energy, which can effectively reduce the comprehensive fuel consumption of marine low-speed diesel engines, improve the fuel economy of marine low-speed diesel engines, and offset the use of EGR technology to deal with pollution by marine low-speed diesel engines The problem of increased fuel consumption caused by pollutant emissions.
发明内容Contents of the invention
本发明的目的在于提供将超临界CO2布雷顿循环与船舶低速柴油机EGR系统相结合，利用EGR冷却器废气的能量发电，提高船舶低速柴油机的燃油经济性，降低船舶低速柴油机采用EGR技术处理污染物排放问题时所带来油耗增加问题的一种船舶低速柴油机EGR冷却器S-CO2循环余热利用系统。The purpose of the present invention is to provide a combination of supercritical CO Brayton cycle and marine low-speed diesel engine EGR system, use the energy of EGR cooler exhaust gas to generate electricity, improve the fuel economy of marine low-speed diesel engines, and reduce the pollution of marine low-speed diesel engines using EGR technology A low-speed diesel engine EGR cooler S-CO 2 cycle waste heat utilization system for marine low-speed diesel engine EGR coolers caused by the problem of fuel emissions.
本发明的目的是这样实现的：The purpose of the present invention is achieved like this:
本发明一种船舶低速柴油机EGR冷却器S-CO2循环余热利用系统，其特征是：包括排气集箱、EGR冷却器、主EGR设备、进气集箱、冷却器、回热器，EGR冷却器包括EGR冷却器烟气侧、EGR冷却器工质侧，冷却器包括冷却器工质侧，回热器包括回热器高温侧、回热器低温侧；排气集箱一方面通过主烟气管道经EGR冷却器烟气侧连通主EGR设备，另一方面通过烟气旁通管连通主EGR设备，主EGR设备连接进气集箱；EGR冷却器烟气侧工质侧出口连通膨胀机进口，膨胀机出口连通回热器高温侧进口，回热器高温侧出口连通冷却器工质侧进口，冷却器工质侧出口连通压缩机进口，压缩机出口连通回热器低温侧进口，回热器低温侧出口连通EGR冷却器工质侧进口，膨胀机连接发电机；EGR冷却器、膨胀机、回热器、冷却器、压缩机构成S-CO2回路，排气集箱、主烟气管道、EGR冷却器、主EGR设备、进气集箱构成EGR回路。The present invention is a ship low-speed diesel engine EGR cooler S-CO 2 cycle waste heat utilization system, which is characterized in that it includes exhaust header, EGR cooler, main EGR equipment, intake header, cooler, regenerator, EGR The cooler includes the flue gas side of the EGR cooler, the working fluid side of the EGR cooler, the cooler includes the working fluid side of the cooler, and the regenerator includes the high temperature side of the regenerator and the low temperature side of the regenerator; The flue gas pipeline is connected to the main EGR equipment through the flue gas side of the EGR cooler, and the main EGR equipment is connected to the main EGR equipment through the flue gas bypass pipe on the other hand, and the main EGR equipment is connected to the intake header; The inlet of the expander, the outlet of the expander are connected to the inlet of the high temperature side of the regenerator, the outlet of the high temperature side of the regenerator is connected to the inlet of the working medium side of the cooler, the outlet of the working medium side of the cooler is connected to the inlet of the compressor, and the outlet of the compressor is connected to the inlet of the low temperature side of the regenerator, The outlet on the low temperature side of the regenerator is connected to the inlet on the working medium side of the EGR cooler, and the expander is connected to the generator; The flue gas pipeline, EGR cooler, main EGR equipment, and intake header constitute the EGR circuit.
本发明还可以包括：The present invention may also include:
1、压缩机与膨胀机同轴。1. The compressor and expander are coaxial.
2、主烟气管道上安装第一控制阀，烟气旁通管上安装第二控制阀。2. The first control valve is installed on the main flue gas pipeline, and the second control valve is installed on the flue gas bypass pipe.
3、S-CO2回路为超临界CO2布雷顿循环回路，S-CO2回路的热源为EGR冷却器的烟气能量。3. The S-CO 2 circuit is a supercritical CO 2 Brayton cycle circuit, and the heat source of the S-CO 2 circuit is the flue gas energy of the EGR cooler.
本发明的优势在于：本发明将EGR和S-CO2系统相结合，能够同时有效的解决船舶低速柴油机NOx污染物排放和能耗两大问题，降低船舶低速柴油机NOx的排放，同时提高船舶低速柴油机的综合能效。S-CO2与EGR排气直接接触换热，且EGR排气具有较高的压力，提高了EGR冷却器的排气侧换热系数，使EGR冷却器具有结构紧凑的优点，有利于该系统在船舶机舱的布置。The advantage of the present invention is that: the present invention combines EGR and S-CO 2 system, can effectively solve the two major problems of marine low-speed diesel engine NOx pollutant discharge and energy consumption at the same time, reduce the emission of marine low-speed diesel engine NOx, and simultaneously improve the low-speed Comprehensive energy efficiency of diesel engines. S-CO 2 is in direct contact with the EGR exhaust for heat exchange, and the EGR exhaust has a higher pressure, which improves the heat transfer coefficient of the exhaust side of the EGR cooler, making the EGR cooler have the advantage of compact structure, which is beneficial to the system Arrangement in the ship's engine room.
附图说明Description of drawings
图1为本发明的结构示意图。Fig. 1 is a structural schematic diagram of the present invention.
具体实施方式detailed description
下面结合附图举例对本发明做更详细地描述：The present invention is described in more detail below in conjunction with accompanying drawing example:
结合图1，本发明统由S-CO2回路和EGR回路组成。其中S-CO2回路由EGR冷却器工质侧1、膨胀机2、回热器3高温侧、冷却器4工质侧、压缩机5、回热器3低温侧、依次连接组成。其中S-CO2回路还包括和膨胀机2同轴连接的发电机6，以及为冷却器4提供冷却水的冷却水泵7。EGR回路由排气集箱8、主烟气管道9、EGR冷却器1烟气侧、主EGR设备11和进气集箱12依次连接组成。其中EGR回路还包括用于旁通作用的烟气旁通管10。With reference to Fig. 1, the system of the present invention is composed of S-CO 2 loop and EGR loop. The S-CO 2 circuit is composed of EGR cooler working medium side 1, expander 2, regenerator 3 high temperature side, cooler 4 working medium side, compressor 5, regenerator 3 low temperature side, connected in sequence. The S-CO 2 circuit also includes a generator 6 coaxially connected with the expander 2 and a cooling water pump 7 providing cooling water for the cooler 4 . The EGR circuit is composed of an exhaust header 8, a main flue gas pipe 9, a flue gas side of an EGR cooler 1, a main EGR device 11 and an intake header 12 connected in sequence. Wherein the EGR circuit also includes a flue gas bypass pipe 10 for bypassing.
由船舶柴油机排气集箱8排出的废气首先通过与之相连的主烟气管道9进入EGR冷却器1之后排入主EGR设备11，在该设备中完成脱硫、进一步冷却之后导入进气集箱12，与新鲜空气混合之后进入船舶柴油机气缸燃烧，排入排气集箱8。进入EGR冷却器1的排气与S-CO2循环工质直接进行换热，提高工质的温度。由EGR冷却器1排出的高温工质则进入膨胀机2做功，膨胀机2的膨胀功则通过与之同轴的发电机6转化为电能。膨胀机排出的S-CO2则进入回热器3高温侧对由压缩机5排出的高压S-CO2进行预热。从回热器3高温侧排出的S-CO2则进入冷却器4冷却后进入压缩机5进行压缩。回热器3低温侧排出的高压S-CO2则进入EGR冷却器1加热完成整个循环。冷却器4中S-CO2的能量则通过与冷却水泵7提供的冷却水进行换热带走。The exhaust gas discharged from the marine diesel engine exhaust header 8 first enters the EGR cooler 1 through the main flue gas pipeline 9 connected to it, and then enters the main EGR equipment 11, where desulfurization is completed and further cooled, then it is introduced into the intake header 12. After mixing with fresh air, it enters the cylinder of marine diesel engine for combustion and discharges into the exhaust header 8. The exhaust gas entering the EGR cooler 1 directly exchanges heat with the S-CO 2 circulating working fluid to increase the temperature of the working fluid. The high-temperature working fluid discharged from the EGR cooler 1 enters the expander 2 to perform work, and the expansion work of the expander 2 is converted into electrical energy through the coaxial generator 6 . The S-CO 2 discharged from the expander enters the high temperature side of the regenerator 3 to preheat the high-pressure S-CO 2 discharged from the compressor 5 . The S-CO 2 discharged from the high temperature side of the regenerator 3 enters the cooler 4 for cooling and then enters the compressor 5 for compression. The high-pressure S-CO 2 discharged from the low-temperature side of the regenerator 3 enters the EGR cooler 1 to be heated to complete the whole cycle. The energy of S-CO 2 in the cooler 4 is carried out through heat exchange with the cooling water provided by the cooling water pump 7 .
S-CO2回路为超临界CO2布雷顿循环回路，S-CO2回路的热源为EGR冷却器的烟气能量。柴油机EGR冷却器的排气与S-CO2布雷顿循环工质CO2直接换热。EGR冷却器能够将EGR排气冷却到排气酸露点之上，或通过采用耐腐蚀材料，排气可以冷却到酸露点以下。回热器出口S-CO2的能量通过与冷却器4中的冷却水进行热交换带走。EGR回路与排气集箱直接相连。采用EGR冷却器S-CO2循环余热利用系统的柴油机的等效油耗应小于或等于未采用EGR系统的柴油机油耗。S-CO2膨胀机2可以同轴连接发电机或同轴连接动力传动装置直接将输出动力回馈到低速柴油机曲轴输出端。S-CO2压缩机可以与S-CO2膨胀机同轴连接或单独驱动。The S-CO 2 circuit is a supercritical CO 2 Brayton cycle circuit, and the heat source of the S-CO 2 circuit is the flue gas energy of the EGR cooler. The exhaust gas of the diesel engine EGR cooler directly exchanges heat with the S-CO 2 Brayton cycle working medium CO2. The EGR cooler can cool the EGR exhaust gas above the acid dew point of the exhaust gas, or by using corrosion-resistant materials, the exhaust gas can be cooled below the acid dew point. The energy of the S-CO 2 at the outlet of the regenerator is taken away by heat exchange with the cooling water in the cooler 4. The EGR circuit is directly connected to the exhaust header. The equivalent fuel consumption of the diesel engine using the EGR cooler S-CO 2 cycle waste heat utilization system should be less than or equal to the fuel consumption of the diesel engine not using the EGR system. The S-CO 2 expander 2 can be coaxially connected to a generator or coaxially connected to a power transmission device to directly feed back the output power to the output end of the crankshaft of the low-speed diesel engine. The S- CO2 compressor can be coaxially connected with the S- CO2 expander or driven separately.
Claims (5)
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| CN113466691A (en) * | 2021-06-18 | 2021-10-01 | 哈尔滨工程大学 | Prediction method for power generation efficiency of two-stage compression expansion generator |
| CN113466691B (en) * | 2021-06-18 | 2022-02-22 | 哈尔滨工程大学 | Prediction method for power generation efficiency of two-stage compression expansion generator |
| CN115164435A (en) * | 2022-06-08 | 2022-10-11 | 松下冷机系统（大连）有限公司 | CO for ship 2 Waterway design of air cooler of transcritical refrigerating unit |
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