CN105422325A - Large diesel engine tail gas circulation treatment system and method - Google Patents
Large diesel engine tail gas circulation treatment system and method Download PDFInfo
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- CN105422325A CN105422325A CN201510882612.2A CN201510882612A CN105422325A CN 105422325 A CN105422325 A CN 105422325A CN 201510882612 A CN201510882612 A CN 201510882612A CN 105422325 A CN105422325 A CN 105422325A
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- tail gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
-
- 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
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
- F02B37/183—Arrangements of bypass valves or actuators therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D23/00—Controlling engines characterised by their being supercharged
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/10—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding acetylene, non-waterborne hydrogen, non-airborne oxygen, or ozone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0017—Controlling intake air by simultaneous control of throttle and exhaust gas recirculation
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Supercharger (AREA)
Abstract
The invention discloses a large diesel engine tail gas circulation treatment system and method. The system comprises an air cylinder, an air inflow system composed of a pure oxygen source and an inert gas source and an EGR system. The EGR system comprises a turbocharger, an intercooler, a scrubber, a gas-water separator and an EGR draught fan. The air inflow system and pure oxygen and inert gas of the EGR system are connected to the air inflow end of the air cylinder through valves in parallel. An air cylinder bypass device is connected to a pipeline between the turbocharger and the intercooler. By the adoption of the large diesel engine tail gas circulation treatment system, pure oxygen and inert gas are used for replacing original air, the oxygen concentration is increased, fuel is promoted to burn completely, and generation of solid particles is reduced; and due to the increase of the amount of circulating tail gas, the nitrogen element in the air is prevented from being converted into NOx, and generation of the NOx is reduced. By the adoption of the tail gas circulation treatment system, the amount of two main pollutants including the NOx and PM in diesel tail gas can be effectively reduced, and environmental protection is facilitated.
Description
Technical field
The present invention relates to the correlative technology field that diesel energy-saving reduces discharging, particularly relate to a kind of large-scale diesel engine circulation of tail gas processing system and processing method.
Background technique
Diesel engine all the time large with its power, efficiency is high is widely used, especially for huge contribution has been made in the progress of seafaring.But because the fuel qualities of diesel engine is poor, especially in large ship, the normal heavy oil that uses is as fuel, and the damage ratio of tail gas to environment of discharge is more serious.The tail gas of diesel emission is main is NOx and PM, for the treatment technology of tail gas, and current main organic pretreatment, emission controls by improving combustion and emission aftertreatment three kinds of modes.Machine pretreatment is mainly realized by the quality improving fuel oil, such as, in fuel oil, increase some additives, suitably improves the cetane number etc. of fuel; Emission controls by improving combustion is then such as, by realizing the improvement of combustion case, improving injection system, be optimized the structure of firing chamber, comprises correlation techniques such as adopting charge inter cooling and realizes; Emission aftertreatment processes tail gas (being mainly NOx), used mainly contains SCR and EGR two kinds of technological methods at present.SCR system is by tail gas is passed into reducing NOx in urea-containing device, and egr system is then mix by being introduced in air inlet by partial tail gas and carrying out secondary combustion, thus reduces the generation of NOx.
But existing egr system can meet the requirement for environment in the ordinary course of things, along with environmental conditions is more and more stricter to the discharge of combustion tail gas, in some cases, need to carry out more deep process to the tail gas of discharge.Therefore, the basis of existing egr system is improved, design a kind of system more meeting environmental requirement.
Summary of the invention
The object of the invention is to the shortcoming and defect overcoming above-mentioned prior art, a kind of large-scale diesel engine circulation of tail gas processing system and processing method are provided.To NOx process contained in tail gas, and the emission limit set making solid particle (PM) within the specific limits.
The present invention is achieved through the following technical solutions:
A kind of large-scale diesel engine circulation of tail gas processing system, comprises cylinder, the gas handling system be made up of pure oxygen source and inert gas source and the EGR circulatory system;
The described EGR circulatory system comprises turbosupercharger, intercooler, washing machine, moisture trap and EGR blower fan;
The input end of described turbosupercharger connects the exhaust end of cylinder by pipeline, the output terminal of turbosupercharger connects intercooler, washing machine, moisture trap and EGR blower fan successively by pipeline; Described EGR blower fan connects the inlet end of cylinder by the pipeline that has EGR valve;
The pure oxygen of described gas handling system and EGR and inert gas are respectively by the inlet end of valve in parallel at cylinder;
Pipeline between described turbosupercharger and intercooler is connected with cylinder by-pass collar.
When the tail gas air pressure that turbosupercharger exports is less than cylinder by-pass collar air pressure predefined value, cylinder by-pass collar is in closed state; And when the tail gas pressure that turbosupercharger exports exceedes this air pressure predefined value, the valve in cylinder by-pass collar is opened automatically, makes a part of exhaust gas flow in air through the pipeline of cylinder by-pass collar or flow to next link.
The outlet of described pure oxygen source and inert gas source is equipped with valve.
The present invention by tail gas being carried out in the circulatory system washing, supercharging, a series of process such as cooling, be back to again in gas handling system, and enter again in cylinder carry out secondary combustion with new charge (pure oxygen and inert gas) mixing, reduce combustion temperature and oxygen concentration, decrease the generation of NOx.
A kind of large-scale diesel engine circulation of tail gas processing method is as follows:
Pure oxygen and inert gas enter cylinder by the inlet end of cylinder, meanwhile, by regulating the aperture of pure oxygen and inert gas supply valve, controlling the size of pure oxygen and inert gas flow respectively, thus regulating the concentration of oxygen;
The tail gas that cylinder produces, a part is directly expelled in air with outlet pipe, and another part enters the EGR circulatory system, enters the tail gas amount of the circulatory system by the EGR blower fan in its loop and EGR valve co-controlling, specific as follows:
First tail gas carry out supercharging by turbosupercharger, flow in next stage pipeline smoothly to make tail gas, intercooler is lowered the temperature to the tail gas from turbosupercharger, tail gas through cooling passes through washing machine, to remove the sour gas in tail gas, by moisture trap, the moisture in tail gas is removed again, then jointly regulated the flow of tail gas by EGR blower fan and EGR valve, to control the tail gas amount flowed into by cylinder intake end in cylinder; The tail gas entered in cylinder mixes with pure oxygen and inert gas, and carries out secondary combustion in the cylinder.
The present invention, relative to prior art, has following advantage and effect:
1, the present invention is different from the air inlet composition of conventional method.Traditional egr system in gas handling system by fuel oil is mixed with air, the N in air
2it is a main source of NOx.And the combination of inert gas and pure oxygen is replaced air by the present invention, the nitrogen element that doing so avoids in air changes into NOx through high-temp combustion, thus decreases the generation of NOx from root, achieves the purified treatment of tail gas.
2, in the present invention, the induction part of cylinder is pure oxygen, and can regulate the concentration shared by it.In system, the percentage composition arranging pure oxygen is slightly higher than in atmosphere, therefore under the prerequisite ensureing rate of fuel consumption, fuel combustion can be made more abundant, thus reduce the generation of solid particle.
3, the present invention is respectively equipped with valve to control the size of the gas flow of inert gas and pure oxygen in gas handling system.The concentration of oxygen can be regulated according to the situation of discharged tail gas, cycle gas amount number, can regulate the harmful matter contained by tail gas in real time in this case.
4, the present invention is at the other in parallel cylinder by-pass collar of turbosupercharger, mainly prevents tail gas too high and the phenomenon such as surge, suck-back occurs at pressure after turbosupercharger.When pressure is normal, cylinder by-pass collar is closed state; And when pressure increase (sets) to a certain extent in advance, the valve in cylinder by-pass collar will be opened, make the exhaust gas of superpressure through draining in air or entering next link.Effectively control the pressure range of the whole EGR circulatory system.
5, the present invention has that efficiency is high, conversion ratio high.Compared with traditional method, by controlling oxygen concentration to control the generation of solid particle; Avoid the N in air
2and increase EGR rate to reduce the generation of NOx.Both combinations can reduce the discharge of topmost pollutant (NOx and PM) in diesel engine vent gas.
6, technical measure is simple and easy to do, and its application will be conducive to the further raising of tail gas disposal technique, more be conducive to environmental protection.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is more specifically described in detail.
Embodiment
As shown in Figure 1.The invention discloses a kind of large-scale diesel engine circulation of tail gas processing system, comprise cylinder, the gas handling system be made up of pure oxygen source and inert gas source and the EGR circulatory system.The nitrogen cycling of elements that inert gas replaces air to avoid in air is NOx, decreases the generation of NOx.
The described EGR circulatory system comprises turbosupercharger, intercooler, washing machine, moisture trap and EGR blower fan; The outlet of described pure oxygen source and inert gas source is equipped with valve.
The input end of described turbosupercharger connects the exhaust end of cylinder by pipeline, the output terminal of turbosupercharger connects intercooler, washing machine, moisture trap and EGR blower fan successively by pipeline; Described EGR blower fan connects the inlet end of cylinder by the pipeline that has EGR valve.
The pure oxygen of described gas handling system and EGR and inert gas are respectively by the inlet end of valve in parallel at cylinder; Pipeline between described turbosupercharger and intercooler is connected with cylinder by-pass collar.Cylinder by-pass collar effectively controls the scope of pressure, avoids the phenomenon occurring that supercharging is too large.Pressure can be adopted to take into account thermometer the tail gas after process is carried out to the monitoring of pressure and temperature respectively and feeds back, avoid it to damage pipeline.
When the tail gas air pressure that turbosupercharger exports is less than cylinder by-pass collar air pressure predefined value, cylinder by-pass collar is in closed state; And when the tail gas pressure that turbosupercharger exports exceedes this air pressure predefined value, the valve in cylinder by-pass collar is opened automatically, makes a part of exhaust gas flow in air through the pipeline of cylinder by-pass collar or flow to next link.
Because gas handling system replaces original air by pure oxygen and inert gas, both improve oxygen concentration like this, promote the perfect combustion of fuel, decrease the generation of solid particle; Meanwhile, owing to adding the amount of recycled offgas, and the nitrogen cycling of elements avoided in air is NOx, decreases the generation of NOx.Effectively control the pollutant that in diesel emission tail gas, NOx and PM these two kinds is main.
By above-mentioned large-scale diesel engine circulation of tail gas processing system, the method that tail gas processes is realized by following steps:
Pure oxygen and inert gas enter cylinder by the inlet end of cylinder, meanwhile, by regulating the aperture of pure oxygen and inert gas supply valve, controlling the size of pure oxygen and inert gas flow respectively, thus regulating the concentration of oxygen;
The tail gas that cylinder produces, a part is directly expelled in air with outlet pipe, and another part enters the EGR circulatory system, enters the tail gas amount of the circulatory system by the EGR blower fan in its loop and EGR valve co-controlling, specific as follows:
First tail gas carry out supercharging by turbosupercharger, flow in next stage pipeline smoothly to make tail gas, intercooler is lowered the temperature to the tail gas from turbosupercharger, tail gas through cooling passes through washing machine (being mainly alkaline solution), to remove the sour gas such as SOx in tail gas, by moisture trap, the moisture in tail gas is removed again, then jointly regulated the flow of tail gas by EGR blower fan and EGR valve, to control the tail gas amount flowed into by cylinder intake end in cylinder; The tail gas entered in cylinder mixes with pure oxygen and inert gas, and carries out secondary combustion in the cylinder.
As mentioned above, just the present invention can be realized preferably.
Embodiments of the present invention are not restricted to the described embodiments; other are any do not deviate from Spirit Essence of the present invention and principle under do change, modification, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (4)
1. a large-scale diesel engine circulation of tail gas processing system, is characterized in that, comprises cylinder, the gas handling system be made up of pure oxygen source and inert gas source and the EGR circulatory system;
The described EGR circulatory system comprises turbosupercharger, intercooler, washing machine, moisture trap and EGR blower fan;
The input end of described turbosupercharger connects the exhaust end of cylinder by pipeline, the output terminal of turbosupercharger connects intercooler, washing machine, moisture trap and EGR blower fan successively by pipeline; Described EGR blower fan connects the inlet end of cylinder by the pipeline that has EGR valve;
The pure oxygen of described gas handling system and EGR and inert gas are respectively by the inlet end of valve in parallel at cylinder;
Pipeline between described turbosupercharger and intercooler is connected with cylinder by-pass collar.
2. large-scale diesel engine circulation of tail gas processing system according to claim 1, is characterized in that, when the tail gas air pressure that turbosupercharger exports is less than cylinder by-pass collar air pressure predefined value, cylinder by-pass collar is in closed state; And when the tail gas pressure that turbosupercharger exports exceedes this air pressure predefined value, the valve in cylinder by-pass collar is opened automatically, makes a part of exhaust gas flow in air through the pipeline of cylinder by-pass collar or flow to next link.
3. large-scale diesel engine circulation of tail gas processing system according to claim 1 and 2, it is characterized in that, the outlet of described pure oxygen source and inert gas source is equipped with valve.
4. a large-scale diesel engine circulation of tail gas processing method, it is characterized in that adopting large-scale diesel engine circulation of tail gas processing system according to any one of claims 1 to 3 to realize, concrete steps are as follows:
Pure oxygen and inert gas enter cylinder by the inlet end of cylinder, meanwhile, by regulating the aperture of pure oxygen and inert gas supply valve, controlling the size of pure oxygen and inert gas flow respectively, thus regulating the concentration of oxygen;
The tail gas that cylinder produces, a part is directly expelled in air with outlet pipe, and another part enters the EGR circulatory system, enters the tail gas amount of the circulatory system by the EGR blower fan in its loop and EGR valve co-controlling, specific as follows:
First tail gas carry out supercharging by turbosupercharger, flow in next stage pipeline smoothly to make tail gas, intercooler is lowered the temperature to the tail gas from turbosupercharger, tail gas through cooling passes through washing machine, to remove the sour gas in tail gas, by moisture trap, the moisture in tail gas is removed again, then jointly regulated the flow of tail gas by EGR blower fan and EGR valve, to control the tail gas amount flowed into by cylinder intake end in cylinder; The tail gas entered in cylinder mixes with pure oxygen and inert gas, and carries out secondary combustion in the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510882612.2A CN105422325A (en) | 2015-12-03 | 2015-12-03 | Large diesel engine tail gas circulation treatment system and method |
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| CN201510882612.2A CN105422325A (en) | 2015-12-03 | 2015-12-03 | Large diesel engine tail gas circulation treatment system and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308005A (en) * | 2019-06-12 | 2019-10-08 | 上海市环境科学研究院 | Fractions of Diesel Engine Exhaust Particulates object generation system and Fractions of Diesel Engine Exhaust Particulates object analogy method |
| CN110446842A (en) * | 2017-03-24 | 2019-11-12 | Mtu腓特烈港有限责任公司 | For running the method and internal combustion engine of internal combustion engine |
| CN110630391A (en) * | 2019-09-02 | 2019-12-31 | 山西省交通科技研发有限公司 | Comprehensive treatment device and treatment method for tail gas of diesel vehicle |
| CN112879188A (en) * | 2021-03-09 | 2021-06-01 | 广西玉柴机器股份有限公司 | Air intake and exhaust treatment system capable of realizing low emission of internal combustion engine |
| CN112879169A (en) * | 2021-03-09 | 2021-06-01 | 广西玉柴机器股份有限公司 | Method and system for controlling air intake and exhaust treatment of internal combustion engine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110446842A (en) * | 2017-03-24 | 2019-11-12 | Mtu腓特烈港有限责任公司 | For running the method and internal combustion engine of internal combustion engine |
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| CN112879188A (en) * | 2021-03-09 | 2021-06-01 | 广西玉柴机器股份有限公司 | Air intake and exhaust treatment system capable of realizing low emission of internal combustion engine |
| CN112879169A (en) * | 2021-03-09 | 2021-06-01 | 广西玉柴机器股份有限公司 | Method and system for controlling air intake and exhaust treatment of internal combustion engine |
| CN112879169B (en) * | 2021-03-09 | 2023-09-05 | 广西玉柴船电动力有限公司 | Method and system for controlling air intake and exhaust treatment of internal combustion engine |
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