A kind of U-shaped heat recoverer for diesel engine waste-heat power generation ORC system
Technical field
Patent of the present invention has related to waste heat recovery and has utilized field, especially relates to a kind of motor exhaust waste heat recovery plant of engine waste heat recovery ORC system.
Background technique
Along with energy-intensive aggravation, the utilization ratio that improves the energy becomes more and more important.Energy-saving and emission-reduction become current most important problem.And the ORC system circulating based on organic Lang Ken, to the utilization of various industrial exhaust heats or used heat, is a technology that well promotes efficiency of energy utilization.
The efficiency of energy utilization of motor is lower, is generally 40% left and right, and all the other heats of 60% scatter and disappear with various forms and enter atmosphere.In motor various forms used heat, with engine exhaust used heat proportion maximum.Based on the engine waste heat generating of ORC principle, become at present the hot issue of engine research, become important measures or the means that improve Fuel Economy of future generation.Wherein the temperature of exhaust fume of motor exhaust is up to more than 600 DEG C, in recent years, in order to improve efficiency and the power stage of motor, the bipolar cooling future development of the high pressure-charging of motor forward and two-stage pressurization.Meanwhile, along with Abgasgesetz further promotes, also higher to motor high pressure-charging and NOx emission request, thus make engine exhaust temperature higher.In ORC system, the heat that how to absorb motor exhaust becomes a key point of motor ORC system.Such as, how to avoid the refrigerant that in ORC system, refrigerant medium and high-temp waste gas heat absorption cause to decompose, how compacter on spatial volume.
Summary of the invention
What the present invention will solve is the problems referred to above that prior art exists, and aims to provide a kind of effective heat recoverer for engine waste heat generating ORC system.
For addressing the above problem, the present invention is by the following technical solutions: a kind of U-shaped heat recoverer for diesel engine waste-heat power generation ORC system, comprise flanged metal winding pipe between first order high temperature waste hot recover, second level waste heat recoverer, described two-stage waste heat recoverer, flanged (FLGD) bellows for being connected with engine exhaust emission pipe and flanged metal winding pipe, it is characterized in that:
Described first order high temperature waste hot recover comprises plaing between thermofin, flat tube and the flat tube by shell, flat tube and flat tube inside and supports and the section turbulence fin of augmentation of heat transfer effect and be enclosed in the jacket water side canal that the outside mainboard that is connected flat tube with two ends of flat tube forms and be arranged on the jacket water turnover water pipe on described shell;
Described second level waste heat recoverer comprises plaing between thermofin, flat tube and the flat tube by shell, flat tube and flat tube inside and supports and the turbulence fin of augmentation of heat transfer effect and be enclosed in coolant media passage and the refrigerant inlet/outlet pipe that the outside mainboard that is connected flat tube with two ends of flat tube forms.
A kind of U-shaped heat recoverer for diesel engine waste-heat power generation ORC system of the present invention, adopt high-efficiency compact automotive heat exchanger augmentation of heat transfer technology, and binding engine tail gas is easy to the characteristic that carbon distribution stops up, design the device with two-stage engine exhaust heat adsorber, realize heat efficient absorption and the utilization of engine waste heat generating ORC system to engine high-temperature tail gas, avoided the refrigerant decomposition that in ORC system, refrigerant medium and high-temp waste gas heat absorption cause.
According to the present invention, between the first order and second level recover, realize the connection to the first order and second level heat recoverer by flanged metal winding pipe.Meanwhile, use with the bellows realization of flange and the connection of motor exhaust outlet pipe and metal winding pipe.Bellows is used for expanding with heat and contract with cold, to reduce the thermal stress of two-stage waste heat recovery unit inside.
As a further improvement on the present invention, because the heat-transfer coefficient of liquid jacket water is large, the turbulence fin in described first order high temperature waste hot recover is made discontinuous, forms by discontinuous 2~3 sections.Described turbulence fin is plain fin or serrated fin, is highly 3~5mm.
Further improve as of the present invention, in first order high temperature waste hot recover, its inside is that engine cylinder jacket water and high-temp waste gas carry out heat exchange again, absorbs high-temp waste gas heat, and the thermofin of flat tube inside adopts corrugated fin or plain fin.In augmentation of heat transfer, reduce motor exhaust carbon distribution, and be easy to carbon distribution cleaning, its spacing of fin is 4~6mm.
Further improve as of the present invention, jacket water arranges with becoming following current on exhaust gas flow direction again, and turnover water pipe is set up at space cloth, is intake pipe at tail gas import mainboard side, and outlet side mainboard side is outlet pipe, and described two water pipes employing bottom in and top outs.The heat that both can absorb fully waste gas is arranged in following current, while also preventing counter-flow arrangement, is vaporized into water vapour in water out side.
Further improve again as of the present invention, in described second level waste heat recoverer, its inside is through the waste gas after heat exchange and the exchange heat of refrigerant medium, and the thermofin of flat tube inside adopts uninterrupted continuous corrugated fin or plain fin, and spacing of fin is 4-6mm.
Further improve as of the present invention, in described second level waste heat recoverer, the turbulence fin that plays support and augmentation of heat transfer effect between flat tube and flat tube is serrated fin again, and fin height is 6~9mm, is recommended as 7.5mm.The liquid jacket water of comparing, refrigerant medium is liquid-vapor mixture or gaseous state, and heat-transfer coefficient is low, and therefore turbulence fin is made non-discontinuous, ensures fully to absorb the heat of waste gas; The height of saw tooth fin is identical with the inner enhanced heat transfer fin height of flat tube.
Further improve as of the present invention, in secondary waste heat recoverer, refrigerant medium is arranged with becoming following current on exhaust gas flow direction again, refrigerant medium inlet/outlet pipe is set up at space cloth, be refrigerant inlet tube at tail gas import mainboard side, outlet side mainboard side is refrigerant exit pipe, and adopts bottom in and top out.Following current arranges and both can absorb fully the heat of waste gas, ensures that gaseous coolant working medium discharges smoothly, and while also preventing counter-flow arrangement, refrigerant exit pipe fittings refrigerant temperature is too high and decompose.
Further improve again as of the present invention, first order high temperature waste hot recover is compared with second level waste heat recoverer, flat tube spacing is smaller, what ensure waste-gas heat makes full use of and prevents waste gas carbon deposit in the waste heat recoverer of the second level, has strengthened secondary used heat adsorber medium side heat-transfer capability simultaneously.
Further improve as of the present invention, described first order high temperature waste hot recover is mutually vertical with the flat tube arragement direction in the waste heat recoverer of the second level, and waste gas can be flowed uniformly in recover, strengthens heat exchange.
In addition, the present invention adopts with the bellows realization of flange and the connection of motor exhaust outlet pipe, and bellows is used for expanding with heat and contract with cold, to reduce the thermal stress of two-stage waste heat recovery unit inside.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Fig. 1 is structural representation of the present invention.
Fig. 2 is the enlarged view at I place in Fig. 1.
Fig. 3 is the enlarged view at II place in Fig. 1.
Fig. 4 be in Fig. 1 A to enlarged view.
Fig. 5 be in Fig. 1 B to enlarged view.
Fig. 6 be in Fig. 1 C-C to cutaway view Amplified image.
Fig. 7 be in Fig. 1 E-E to cutaway view Amplified image.
Embodiment
With reference to accompanying drawing, a kind of U-shaped heat recoverer for diesel engine waste-heat power generation ORC system of the present invention, comprises flanged metal winding pipe 7 between first order high temperature waste hot recover 12, second level waste heat recoverer 10, described two-stage waste heat recoverer, flanged (FLGD) bellows 1 for being connected with engine exhaust emission pipe and flanged metal winding pipe 7.
Wherein, first order high temperature waste hot recover 12 comprises plaing between enhanced heat transfer fin 13, flat tube and the flat tube by metal thin-wall shell 3, flat tube 5 and flat tube inside and supports and discontinuous 2~3 sections of turbulence fins 4 of interruption of augmentation of heat transfer effect and be enclosed in the jacket water side canal that the outside mainboard 11 that is connected flat tube with two ends of flat tube forms and be arranged on the jacket water turnover water pipe 14,6 on described shell 3.
Second level waste heat recoverer 10 comprises plaing between enhanced heat transfer fin 18, flat tube and the flat tube by metal thin-wall shell 19, flat tube 8 and flat tube inside and supports and the uninterrupted continuous turbulence fin 9 of augmentation of heat transfer effect and be enclosed in coolant media passage and the refrigerant inlet/outlet pipe 16,17 that flat tube outside is connected flat tube mainboard 15 with two ends forms.
In first order high temperature waste hot recover 12, its inside is that engine cylinder jacket water and high-temp waste gas carry out heat exchange, absorbs high-temp waste gas heat, and the thermofin 13 of flat tube inside adopts corrugated fin or plain fin; The turbulence fin 4 that plays reinforcement support and augmentation of heat transfer effect between flat tube and flat tube is plain fin or serrated fin.Because the heat-transfer coefficient of liquid jacket water is large, therefore turbulence fin 4 is made discontinuous.The height of turbulence fin 4, that is to say that between flat tube and flat tube, distance is 3~5mm.The fin 13 of the inner augmentation of heat transfer of flat tube, in augmentation of heat transfer, reduce motor exhaust carbon distribution, and is easy to carbon distribution cleaning, and its spacing of fin is 4~68mm, and fin type is the non-interruption class fins such as ripple type or flat type.
Jacket water is arranged with becoming following current on exhaust gas flow direction.Turnover water pipe 14,6 is set up at space cloth, is intake pipe 14 at tail gas import mainboard side, and outlet side mainboard side is outlet pipe 6.Two water pipes adopt bottom in and top out.The heat that both can absorb fully waste gas is arranged in following current, while also preventing counter-flow arrangement, is vaporized into water vapour in water out side.
In second level waste heat recoverer 10, its inside is that the thermofin 18 of flat tube 8 inside adopts corrugated fin or plain fin through the waste gas after heat exchange and the exchange heat of refrigerant medium, and spacing of fin is 6-8mm; The fin 9 that plays support and augmentation of heat transfer effect between flat tube and flat tube is serrated fin, and fin height is 6~9mm, is recommended as 7.5mm.The liquid jacket water of comparing, refrigerant medium is liquid-vapor mixture or gaseous state, and heat-transfer coefficient is low, and therefore turbulence fin 9 is made non-discontinuous, ensures fully to absorb the heat of waste gas; The height of saw tooth fin is identical with the inner enhanced heat transfer fin height of flat tube.
In secondary waste heat recoverer, refrigerant medium with on exhaust gas flow direction, become following current arrange, refrigerant medium inlet/outlet pipe 16,17 is set up at space cloth, is refrigerant inlet tube 16 at tail gas import mainboard side, outlet side mainboard side is refrigerant exit pipe 17, adopt bottom in and top out.Discharge smoothly to ensure gaseous coolant working medium.Following current arranges and both can absorb fully the heat of waste gas, ensures that gaseous coolant working medium discharges smoothly, and while also preventing counter-flow arrangement, refrigerant exit pipe fittings refrigerant temperature is too high and decompose.
First order high temperature waste hot recover 12 is compared with second level waste heat recoverer 10, Tn is little for flat tube spacing, the object of doing be like this to ensure waste-gas heat make full use of and prevent waste gas carbon deposit in the waste heat recoverer of the second level, and strengthening secondary used heat adsorber medium side heat-transfer capability.
Use with bellows 1 realization of flange and the connection of motor exhaust outlet pipe.Meanwhile, bellows is used for expanding with heat and contract with cold, to reduce the thermal stress of two-stage waste heat recovery unit inside.Between first order high temperature waste hot recover and second level waste heat recoverer, realize and being connected by metal tubes 7, and two-stage waste heat recoverer flat tube arragement direction direction in 90 ° separately, the object of doing is like this that waste gas can be flowed uniformly in recover, strengthens heat exchange.。
Should be understood that: above-described embodiment is just to explanation of the present invention, instead of limitation of the present invention, and any innovation and creation that do not exceed within the scope of connotation of the present invention, within all falling into protection scope of the present invention.