CN107035477B - Medium-load and low-load energy recovery device and method for low-speed diesel engine matched with high-pressure SCR system - Google Patents
Medium-load and low-load energy recovery device and method for low-speed diesel engine matched with high-pressure SCR system Download PDFInfo
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- CN107035477B CN107035477B CN201710332162.9A CN201710332162A CN107035477B CN 107035477 B CN107035477 B CN 107035477B CN 201710332162 A CN201710332162 A CN 201710332162A CN 107035477 B CN107035477 B CN 107035477B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
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- 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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Abstract
The invention aims to provide a medium and low load energy recovery device and a recovery method for a low-speed diesel engine matched with a high-pressure SCR system. The invention adopts the bypass technology of the turbocharger to improve the temperature of the exhaust gas so as to meet the requirement of an SCR system, and simultaneously utilizes the part of the bypass exhaust gas to drive the power turbine to generate electricity, thereby reducing the emission of NOx and recovering the energy in the exhaust gas.
Description
Technical Field
The invention relates to a diesel engine emission treatment system, in particular to a low-speed diesel engine SCR system.
Background
The ship is a transportation tool with huge energy consumption, and the high energy consumption increases the running cost of the ship on one hand and also brings serious environmental problems to the running of the ship on the other hand. Therefore, how to effectively reduce the energy consumption and the emission of the ship is a significant and practical topic.
For diesel emission control, it is important to reduce exhaust gas NOx emissions. At present, the SCR technology is the only technology recognized by the International Maritime Organization (IMO) for reducing NOx emission and can be used for various ship engines and ship types, and can theoretically meet the IMOTier III or stricter emission standard. According to the working characteristics and the arrangement mode of the SCR system, the SCR system of the low-speed diesel engine can be divided into a low-pressure SCR system and a high-pressure SCR system. In comparison, the high-voltage SCR system is more compact in structure, higher in energy efficiency utilization rate and more suitable for a low-speed diesel engine with higher power.
In high pressure SCR systems, if low sulfur fuel is used, operating costs are further increased. For marine engines, high sulfur residues are generally used, and the exhaust gas contains a large amount of SOx, and if the exhaust gas temperature is low, sulfuric acid or sulfurous acid is formed in the high-pressure SCR system, and reacts with NH3 in the high-pressure SCR system, so that sulfate is formed, and pipelines and catalyst channels are blocked. The exhaust gas needs to have a higher temperature when entering the high-pressure SCR system.
In a high-pressure SCR system, an SCR reactor is arranged in front of a turbine, exhaust gas directly enters a mixer from a scavenging tank to be mixed with a reducing agent, the exhaust gas enters a turbocharger after reaction in the SCR system is finished, and the temperature of the exhaust gas is high. Under the condition of high load, the temperature of the waste gas meets the requirement and does not need to be modulated; however, at medium and low load conditions, the exhaust gas temperature is typically lower than the desired operating temperature for the high pressure SCR system, requiring host modulation measures to increase the exhaust gas temperature.
In prior art main engine modulation, cylinder bypass and turbocharger bypass techniques are typically employed to increase exhaust gas temperature. The cylinder bypass technology reduces a part of air inlet in the scavenging box, and meanwhile, the oil injection quantity of the main engine is unchanged. Turbocharger bypass techniques bypass a portion of the exhaust gas before it enters the turbocharger, thereby reducing the compressor's work capacity and also reducing the intake air. Theoretically speaking, the air input of the main engine is reduced by the two measures, the fuel injection quantity is unchanged, the fuel consumption of the main engine is increased while the temperature of the waste gas is increased, and the operation cost of the whole system is increased.
Due to the action of the high-pressure SCR system, the back pressure of the waste gas is changed, the burning of the main machine is influenced to a certain extent, and the oil consumption of the system is increased. Meanwhile, the host is adopted for modulation under the conditions of medium load and low load, so that the oil consumption is further increased, and the emission of carbon dioxide of the whole system is increased. Due to the high-pressure SCR system, the emission of NOx is reduced, but the oil consumption and the emission of carbon dioxide are increased at the same time. Therefore, if a part of energy can be recycled in the high-pressure SCR system, a part of oil consumption and carbon dioxide emission can be reduced, and the environment can be better protected while the operation cost is reduced.
In the waste heat recovery technology, a power turbine is generally used to recover waste heat of exhaust gas, and the power turbine can generate electricity by using waste pressure energy of the exhaust gas and has high energy recovery efficiency. When the high-pressure SCR system operates under the conditions of medium and low load, a part of exhaust gas is bypassed in the turbocharger due to the modulation of the main engine, if the part of exhaust gas is directly discharged into the environment, the energy in the exhaust gas is not effectively utilized, and if the part of exhaust gas is used for driving the power turbine to generate electricity, the energy in the exhaust gas can be effectively recycled, so that the energy utilization efficiency of the whole system is improved.
Disclosure of Invention
The invention aims to provide a medium and low load energy recovery device and a recovery method for a low-speed diesel engine matched high-pressure SCR system, which can effectively reduce NOx, recover energy in bypass exhaust gas and improve the energy utilization efficiency of the whole system.
The purpose of the invention is realized as follows:
the invention relates to a medium and low load energy recovery device of a low-speed diesel engine matched with a high-pressure SCR system, which is characterized in that: including the inlet box, the exhaust box, turbo charger, power turbine, the SCR reactor, the air inlet and the gas vent of diesel engine communicate inlet box and exhaust box respectively, the exhaust box passes through SCR intake pipe intercommunication SCR reactor, SCR reactor intercommunication SCR outlet duct, set up the evaporation mixer in the SCR intake pipe, SCR outlet duct intercommunication turbo charger's turbine, communicate power turbine through the power pipeline simultaneously, turbo charger's compressor export passes through air cooler intercommunication inlet box, power turbine connects the turbine power generation group, electricity storage device and rectifier inverter are connected respectively to the turbine power generation group, rectifier inverter connects outside electric wire netting.
The medium and low load energy recovery device of the low-speed diesel engine matched high-pressure SCR system can also comprise:
1. set up first valves in the SCR intake pipe, set up the second valves on the SCR outlet duct in SCR reactor exit, set up the third valves on the power line.
The invention relates to a medium and low load energy recovery method for a low-speed diesel engine matched with a high-pressure SCR system, which is characterized by comprising the following steps of: opening a first valve bank and a second valve bank and closing a third valve bank when the diesel engine is in a high-load condition, allowing exhaust gas discharged from the diesel engine to enter an exhaust box, allowing the exhaust gas to enter an evaporation mixer from the exhaust box through the first valve bank, mixing the exhaust gas with a reducing agent in the evaporation mixer, allowing the exhaust gas to enter an SCR (selective catalytic reduction) reactor, catalytically reducing NOx in the exhaust gas into nitrogen under the action of a catalyst, allowing the exhaust gas to exit from the SCR reactor, allowing the exhaust gas to enter a turbocharger through the second valve bank, and then discharging the exhaust gas from the turbocharger;
the diesel engine is in under the medium, low-load condition, opens first valves, second valves, third valves, and the exhaust waste gas gets into the exhaust case from the diesel engine, and waste gas comes out from the exhaust case and gets into the evaporation mixer through first valves, mixes with the reductant in the evaporation mixer, gets into the SCR reactor, and NOx in the waste gas is the nitrogen gas by catalytic reduction under the effect of catalyst, and waste gas comes out from the SCR reactor, divide into two parts: a part of the exhaust gas enters the power turbine through the third valve group to drive the power turbine to generate electricity, then the part of the exhaust gas is discharged from the power turbine to enter air, the other part of the exhaust gas enters the turbocharger, and then the exhaust gas is discharged from the turbocharger to the atmosphere.
The invention has the advantages that: the invention adopts the bypass technology of the turbocharger under the conditions of medium and low load to improve the temperature of the exhaust gas so as to meet the requirements of an SCR system, and simultaneously utilizes the part of bypass exhaust gas to drive the power turbine to generate electricity, thereby reducing the emission of NOx, recovering the energy in the exhaust gas, reducing the oil consumption of the system and the emission of carbon dioxide to the greatest extent, reducing the operation cost and reducing the influence on the environment.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
referring to fig. 1, the invention comprises a main engine 1, a high-pressure SCR system, and a power turbine power generation system driven by exhaust gas bypass, wherein under medium and low load conditions, the main engine 1 firstly enters an exhaust box 2, then the exhaust gas enters the SCR system, NOx in the exhaust gas is catalytically reduced to nitrogen in the SCR system, and after the exhaust gas reacts in the SCR system, a part of the exhaust gas enters a turbocharger 9 for compressing air and then is discharged to the atmosphere; another part is bypassed into the power turbine 8 to drive the power turbine 8 to generate electricity, and then discharged to the atmosphere.
The connection mode and the flow of the invention are as follows: the exhaust gas from the diesel engine 1 enters an exhaust gas tank 2 and then enters a high-pressure SCR system, NOx in the exhaust gas is reduced into nitrogen, and then the whole system is divided into two working states. 1) Under high load conditions, the exhaust gases exit the high pressure SCR system all the way to the turbocharger 9 for compression of the air before being discharged into the atmosphere and the entire process is finished. 2) Under the conditions of medium and low load, a part of exhaust gas is bypassed into the power turbine 8 to drive the power turbine to generate electricity, the other part of exhaust gas enters the turbocharger to compress air, then the two parts of exhaust gas are mixed and discharged into the air, and the whole process is finished.
The whole system in fig. 1 is divided into 2 operation states in the actual operation process.
1) Under high load conditions, the host does not modulate. At this time, the valve groups V1 and V2 are opened, and the valve group V3 is closed. The exhaust gas is discharged from the diesel engine 1 and enters the exhaust box 2, the exhaust gas enters the evaporation mixer 4 from the exhaust box 2 through the valve bank V1, the exhaust gas is mixed with a reducing agent in the evaporation mixer and enters the SCR reactor 5, NOx in the exhaust gas is catalytically reduced into nitrogen under the action of a catalyst, the exhaust gas comes out of the SCR reactor 5 and enters the turbocharger 9 through the valve bank V2 to be used for compressing air, and then the exhaust gas is discharged from the turbocharger 9.
2) Under the conditions of medium and low load, the turbocharger bypass is adopted for main engine modulation. The valve banks V1, V2 and V3 are all open. The exhaust gas is discharged from the diesel engine 1 and enters the exhaust gas tank 2, the exhaust gas is discharged from the exhaust gas tank 2 and enters the evaporation mixer 4 through the valve bank V1 through the valve bank V1, the exhaust gas is mixed with a reducing agent in the evaporation mixer and enters the SCR reactor 5, NOx in the exhaust gas is catalytically reduced into nitrogen under the action of a catalyst, and the exhaust gas is discharged from the SCR reactor 5 and divided into two parts: a part of the exhaust gas enters the power turbine 8 through the valve group V3 to drive the power turbine to generate electricity, and then the part of the exhaust gas is discharged from the power turbine 8 into air; another portion of the exhaust gas enters the turbocharger 9 for compressing the air, after which the exhaust gas is discharged from the turbocharger 9 into the atmosphere.
The power turbine 8 is connected with a generator set 12, and after the turbine generator set generates electricity, the electricity enters an external power grid 15 through the action of a rectifier inverter 14 for meeting the daily power supply requirement on the ship; on the other hand, when the electricity demand on the ship is small, the turbo generator set can store the corresponding electricity in the electricity storage device 13 after generating electricity, and supply the electricity demand on the ship when the electricity demand is large.
Claims (2)
1. A medium and low load energy recovery method for a low-speed diesel engine matched with a high-pressure SCR system is characterized by comprising the following steps: the method comprises the following steps that a first valve bank is arranged on an SCR air inlet pipe, a second valve bank is arranged on an SCR air outlet pipe at the outlet of an SCR reactor, a third valve bank is arranged on a power pipeline, a diesel engine is under a high-load condition, the first valve bank and the second valve bank are opened, the third valve bank is closed, exhaust gas discharged from the diesel engine enters an exhaust box, the exhaust gas enters an evaporation mixer from the exhaust box through the first valve bank, the exhaust gas enters the SCR reactor after being mixed with a reducing agent in the evaporation mixer, NOx in the exhaust gas is catalytically reduced into nitrogen under the action of a catalyst, the exhaust gas comes out of the SCR reactor, enters a turbocharger through the second valve bank, and then the exhaust gas is discharged from the turbocharger;
the diesel engine is in under the medium, low-load condition, opens first valves, second valves, third valves, and the exhaust waste gas gets into the exhaust case from the diesel engine, and waste gas comes out from the exhaust case and gets into the evaporation mixer through first valves, mixes with the reductant in the evaporation mixer, gets into the SCR reactor, and NOx in the waste gas is the nitrogen gas by catalytic reduction under the effect of catalyst, and waste gas comes out from the SCR reactor, divide into two parts: one part of waste gas enters the power turbine through the third valve group to drive the power turbine to generate power, then the part of waste gas is discharged from the power turbine to enter air, the other part of waste gas enters the turbocharger, and then the waste gas is discharged from the turbocharger to enter the atmosphere, so that the air inflow of the main engine is reduced, the fuel injection quantity is unchanged, the oil consumption of the main engine is increased while the temperature of the waste gas is increased, and the emission of carbon dioxide of the whole system is increased;
under high load conditions, no modulation is required; under the conditions of medium load and low load, the temperature of the exhaust gas is lower than the working temperature required by the high-pressure SCR system, and the temperature of the exhaust gas is increased by adopting a turbocharger bypass technology under the conditions of medium load and low load so as to meet the requirement of the SCR system; the medium and low load energy recovery method of the low-speed diesel engine matched with the high-pressure SCR system is applied to the low-speed diesel engine with the high-pressure SCR system.
2. A medium and low load energy recovery device of a low speed diesel engine matched high pressure SCR system, which adopts the medium and low load energy recovery method of the low speed diesel engine matched high pressure SCR system of claim 1, is characterized in that: including the inlet box, the exhaust box, turbo charger, power turbine, the SCR reactor, the air inlet and the gas vent of diesel engine communicate inlet box and exhaust box respectively, the exhaust box passes through SCR intake pipe intercommunication SCR reactor, SCR reactor intercommunication SCR outlet duct, set up the evaporation mixer in the SCR intake pipe, SCR outlet duct intercommunication turbo charger's turbine, communicate power turbine through the power pipeline simultaneously, turbo charger's compressor export passes through air cooler intercommunication inlet box, power turbine connects the turbine power generation group, electricity storage device and rectifier inverter are connected respectively to the turbine power generation group, rectifier inverter connects outside electric wire netting.
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| CN201710332162.9A CN107035477B (en) | 2017-05-12 | 2017-05-12 | Medium-load and low-load energy recovery device and method for low-speed diesel engine matched with high-pressure SCR system |
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| CN201710332162.9A CN107035477B (en) | 2017-05-12 | 2017-05-12 | Medium-load and low-load energy recovery device and method for low-speed diesel engine matched with high-pressure SCR system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107486016B (en) * | 2017-08-22 | 2020-12-22 | 哈尔滨工程大学 | Low-temperature desulfurization and denitrification technology applicable to high-sulfur fuel oil for marine low-speed diesel engine |
| CN107989676A (en) * | 2017-11-23 | 2018-05-04 | 南通象屿海洋装备有限责任公司 | A kind of ship power plant waste gases tapping equipment using HP-SCR technologies |
| CN108643994B (en) * | 2018-04-28 | 2020-06-19 | 湖南大学 | Multistage combined recovery device for exhaust energy of vehicle-mounted engine |
| CN108644021B (en) * | 2018-04-28 | 2020-05-01 | 江苏大学 | Multi-stage combined recovery control method for exhaust energy of vehicle-mounted engine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN86102888A (en) * | 1985-04-25 | 1986-10-22 | Bbc勃朗勃威力有限公司 | Supercharged marine diesel engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86102888A (en) * | 1985-04-25 | 1986-10-22 | Bbc勃朗勃威力有限公司 | Supercharged marine diesel engine |
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