CN108894834A - The expanding machine oil return feeding system that can be monitored automatically - Google Patents
The expanding machine oil return feeding system that can be monitored automatically Download PDFInfo
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- CN108894834A CN108894834A CN201810717670.3A CN201810717670A CN108894834A CN 108894834 A CN108894834 A CN 108894834A CN 201810717670 A CN201810717670 A CN 201810717670A CN 108894834 A CN108894834 A CN 108894834A
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- 239000010721 machine oil Substances 0.000 title claims abstract description 20
- 239000003921 oil Substances 0.000 claims abstract description 256
- 230000001105 regulatory effect Effects 0.000 claims abstract description 37
- 239000010687 lubricating oil Substances 0.000 claims description 71
- 239000000446 fuel Substances 0.000 claims description 29
- 238000013021 overheating Methods 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 16
- 238000009434 installation Methods 0.000 claims description 10
- 238000005461 lubrication Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000004090 dissolution Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 7
- 230000005622 photoelectricity Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000004519 grease Substances 0.000 claims description 5
- 239000000284 extract Substances 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 7
- 238000004064 recycling Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000007791 liquid phase Substances 0.000 description 6
- 239000000314 lubricant Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 235000003642 hunger Nutrition 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 230000037351 starvation Effects 0.000 description 4
- 206010008469 Chest discomfort Diseases 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- BVPWJMCABCPUQY-UHFFFAOYSA-N 4-amino-5-chloro-2-methoxy-N-[1-(phenylmethyl)-4-piperidinyl]benzamide Chemical compound COC1=CC(N)=C(Cl)C=C1C(=O)NC1CCN(CC=2C=CC=CC=2)CC1 BVPWJMCABCPUQY-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 230000000712 assembly Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
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- 238000007616 round robin method Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/18—Lubricating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The present invention discloses a kind of expanding machine oil return feeding system that can be monitored automatically, including working cycles subsystem and for oil return subsystem, the working cycles subsystem includes the expanding machine for circuiting sequentially connection, condenser, working medium pump and evaporator, described for oil return subsystem includes sequentially connected gs-oil separator, oil storage tank, oil strainer, scavenge oil pump, regenerator, first flow regulating valve and second flow regulating valve, the entrance of the gs-oil separator connects the exit of the expanding machine, the outlet of the regenerator connects the inlet of the expanding machine, one end of the first flow regulating valve is connected between the outlet of the regenerator and the entrance of the expanding machine, the other end of the first flow regulating valve connects the inlet of the oil storage tank, the second flow regulating valve is installed in parallel in the both ends of the regenerator.Present device structure is simple, high degree of automation, and design is succinct efficient, occupies little space, economic cost is low, has great application prospect.
Description
Technical field
The present invention relates to heat recovery technology field, specially a kind of expanding machine oil return feeding system that can be monitored automatically.
Background technique
With the continuous deterioration of the continuous rise and environment of energy demand and energy prices, energy conservation, energy recovery are already
Development strategy as country.Key technology of the Organic Rankine Cycle (ORC) as Low and mid temperature heat recovery, has become vast
The research hotspot of scholar.Wherein, a big key equipment of the expanding machine as Organic Rankine Cycle, runnability greatly influence
The thermal efficiency of cycle of system, expanding machine be in the state to run at high speed during the work time, need enough lubricating oil pair
Its pair that rubs is lubricated, cools down and takes away the clast generated in friction process, and the oil return feeding system of expanding machine is very big
It decides the working efficiency and working life of expanding machine in degree, and by the runnability to entire ORC system and recycles thermal effect
Rate has an impact.The quality of expanding machine lubricating system directly determines the operational efficiency of expanding machine, and then influences the circulation effect of system
Rate.The oil return feeding system of expanding machine cannot achieve the accurate control of the charge oil pressure to expanding machine, oil temperature supplying and fuel delivery at present
System, and without special race oil recovery system, it is poor to result in expanding machine lubricant effect, furthermore also affects heat exchange in system and sets
Standby heat exchange efficiency.
However, more lacking about the research of expanding machine oil return feeding system at present, and traditional expanding machine is for oil return system
It unites often relatively simple, cannot achieve and accurately monitoring and control are carried out to oil temperature supplying, charge oil pressure and fuel supply flow rate.Again
Person is influenced by gs-oil separator separative efficiency, and the oil return feeding system of traditional expanding machine is reaching certain operation duration
Afterwards, a large amount of lubricating oil will enter and remain in the other component of ORC system (the predominantly heat exchanging part such as condenser, evaporator
In part), the heat exchange efficiency of each heat exchanger components is not only reduced, will also cause expanding machine for shortage of oil, and then reduces entire ORC system
Operational efficiency.When system occurs running oily serious situation, traditional expanding machine oil return feeding system can not be in system circuit
Lubricating oil carry out recycling and reusing, working medium and make-up oil can only be re-replaced, this will increase the operation of ORC system at
This, and adding up with runing time, the cycle efficieny of system also can gradually decline.
In the prior art, document relevant to expanding machine lubricating oil system is more deficient.Publication No. CN105888731A,
Apply entitled《A kind of Organic Rankine Cycle single-screw expander lubricating system》Chinese invention patent application disclose one kind and have
Machine Rankine cycle single-screw expander lubricating system, can be in evaporator using organic Rankine working medium and oil mixture
It is divided into gaseous working medium and liquid lubricant, to complete the lubricating system of Organic Rankine Cycle single-screw expander.Publication No.
CN101194084A applies entitled《Expanding machine lubrication in steam power system》Chinese invention patent Shengong open a kind of use
In the steam power generation system for generating power by using the heat for carrying out self-heat power.The system comprises for working fluid
Closed circuit, and including：Heat exchanger assemblies, for heating fluid under stress using the heat from the source；Separator,
The vapour phase and its liquid phase separation of fluid for that will heat；Expanding machine, for making steam expansion to generate power；Condenser is used
It is condensed in the discharge fluid from the expanding machine；The fluid of feed pump, the condensation for condenser in future returns
To heater；And current return circuit, for heater will to be returned to from the liquid phase of the separator.The liquid phase of the working fluid
Including lubricant, which dissolves in liquid phase or can be miscible with liquid phase, and arranges bearing supply passageway, for will be by
The liquid phase of feed pump pressurization is delivered at least one bearing of the rotating element for expanding machine.The above-mentioned prior art is generally existing
Shortcoming include：1, lubricating oil being directly dissolved in working medium, lubricating oil is run in entire ORC system with working medium, this
It will lead to parts of lubricating oil to be detained in each heat exchanger, not only reduce the coefficient of heat transfer of each heat exchanger components, also greatly increase
Lubricating oil uses oil mass；2, gs-oil separator is arranged between evaporator outlet and expander inlet, is steaming lubricating oil
Heating of absorbing heat in device is sent out, is then cooled down again using oil cooler to lubricating oil, a cold heat is cancelled out each other, and the energy is caused
Waste；3, system lacks lubricating oil monitoring system, can not accurately detect expanding machine whether oil starvation；4, oil circulating pump can not basis
The inlet pressure of expanding machine adjusts charge oil pressure, and it is too low or excessively high to may cause oil pressure, and fuel feeding is caused to fail；It 5, can not be to expansion
The fuel delivery of machine is controlled, and will lead to expanding machine rich oil or oil starvation.
Summary of the invention
The shortcomings that in order to overcome the prior art to refer to, the present invention provide a kind of expanding machine that can be monitored automatically for oil return system
System, can be mainly used in Organic Rankine Cycle, carry out accurate fuel feeding to expanding machine, and supervise to the lubricants capacity of system
It surveys, switches to the oily take-back model of race when necessary, ensured the safe and highly efficient operation of expanding machine, while improving the circulation thermal effect of system
Rate.
The present invention solve technical solution that its technical problem uses for：A kind of expanding machine that can be monitored automatically is for oil return system
System, including working cycles subsystem and for oil return subsystem, the working cycles subsystem include expanding machine, gs-oil separator,
Condenser, working medium pump and evaporator, the expanding machine is connect with gs-oil separator, the gs-oil separator and the condenser connect
Connect, the condenser is connect with working medium pump, the working medium pump is connect with evaporator, the evaporator is connect with expanding machine, in institute
It states and regenerator is set between working medium pump and evaporator；It is described for oil return subsystem include gs-oil separator, oil storage tank, oil filter
Device, scavenge oil pump, regenerator, first flow regulating valve and second flow regulating valve, the gs-oil separator are connect with oil storage tank, institute
Oil storage tank is stated to connect with oil strainer, the oil strainer is connect with scavenge oil pump, the scavenge oil pump and the regenerator with it is described
Expanding machine connection, pipeline of the first flow regulating valve installation at one end between regenerator and the expanding machine are connect, separately
The pipeline branch road of pipeline connection between one end and gs-oil separator and oil storage tank, the second flow regulating valve be mounted on
The pipeline branch road of regenerator both ends connection.
It further include having control unit, described control unit includes controller, photoelectric level inductor, the first temperature sensing
Device, second temperature sensor, first pressure sensor, second pressure sensor, the first thermocouple and the second thermocouple；The light
Electric level sensor is mounted in the oil storage tank, and first temperature sensor and first pressure sensor are mounted on expanding machine
Inlet, the second temperature sensor and second pressure sensor are mounted at expander outlet, the first thermocouple peace
Oil sump bottom loaded on the expanding machine, second the installation of TC is in the first flow regulating valve and the regenerator
Connect intersection；The photoelectric level inductor, the first temperature sensor, second temperature sensor, first pressure sensor,
The control of controller described in two pressure sensors, the first thermocouple and the second thermocouple data connection, the controller control connection
The scavenge oil pump, first flow regulating valve and second flow regulating valve.
It further include having race oil recycling control unit, the race oil recycling control unit includes the first shut-off valve, second section
Only valve and third shut-off valve, second shut-off valve are installed between the evaporator and the expanding machine, the third cut-off
Valve is installed between the expanding machine and the gs-oil separator, and first shut-off valve is installed in parallel in second shut-off valve
Arrival end and the third shut-off valve outlet end, controller control connects first shut-off valve, the second shut-off valve
With third shut-off valve.
The present invention uses judgment basis of the oil overheating degree as expanding machine fuel feeding situation, and the definition of oil overheating degree is swollen
Lubricating oil temperature in swollen machine subtracts the saturation temperature of working medium under the operating pressure, and (high pressure chest expanding machine takes pressure of inspiration(Pi), low pressure
Chamber expanding machine takes pressure at expulsion), oil overheating degree is a relative value, and characterization lubricating oil exceeds the degree of its original state.No
It is also different with the default oil overheating degree under operating condition, it can determine that the oil temperature under different operating conditions by following circulation experiment method
The degree of superheat：
S1., expanding machine air extractor is set, extracts working medium/oil mixture in expanding machine, and by working medium and lubricate
Oil separation, calculates the actual solubility of lubricating oil under the operating condition；
S2. according to the running temperature of expanding machine, pressure, lubrication when solubility-Pressure/Temperature figure being taken to obtain normal fuel injection is looked into
The theoretical dissolution degree of oil；
S3. theoretical dissolution degree and actual solubility are compared, whether both is judged close to (can be true according to practical working medium situation
Determine close to range)；
If S4. the two is close, oil overheating degree is calculated, and in this, as the default oil temperature mistake of expanding machine under the operating condition
Temperature carries out S5；If the departure of the two is more than preset value, fuel delivery is adjusted, theoretical dissolution degree is close to, returns again to
S1；
S5. the operating pressure and running temperature for changing expanding machine, return to S1, carry out circulation experiment, finally draw out each work
Default oil overheating degree-Pressure/Temperature figure under condition.
The course of work of the invention：
1, expanding machine normal fuel injection mode：When the liquid level in photoelectric level inductor detection oil storage tank is more than preset
When minimum liquid level, working cycles subsystem and for oil return subsystem work normally；Lubricating oil is flowed out from oil storage tank, by oily mistake
Enter oil pump after filter, oil pump provides recycle stream power for lubricating oil, and controller is according to first pressure sensor (expander inlet
Pressure) by changing the running frequency of oil pump to control charge oil pressure；Then, the lubricating oil for reaching default charge oil pressure is divided into two
Road enters regenerator all the way and cools down, and another way passes through first flow regulating valve, and behind regenerator exit and cooling
Lubricating oil mixed, the temperature value that controller is fed back according to the second thermocouple, adjust second flow control valve aperture, from
And the flow of lubrication for participating in heat exchange is controlled, and then realize the control of oil temperature supplying；Controller is according to default oil overheating degree-pressure
Power/hygrogram determines fuel delivery, therefore the extra lubricating oil in part comes back to oil storage tank, another portion by first flow control valve
Lubricating oil of sharing in the benefit is transported at expander inlet, secondary into the base bearing of expanding machine and each friction after mixing with working medium；Finally, complete
Entering gs-oil separator at the lubricating oil after lubrication/working medium mixture to be separated, the gaseous working medium after separation enters condenser,
Liquid lubricant returns to oil storage tank, starts new circulation；
2, oily take-back model is run：When the liquid level in photoelectric level inductor detection oil storage tank is lower than preset minimum liquid
When position, system switches to the oily take-back model of race：At this point, the controller control oil pump is shut down, meanwhile, the first shut-off valve of control is beaten
It opens, controls the second shut-off valve and third shut-off valve is closed, and working medium pump stroke increases, and increases the flow of working cycles subsystem
Greatly.It carries the working medium of lubricating oil and condenser, working medium pump, regenerator and evaporator is passed through successively with higher flow velocity, then
Enter gs-oil separator after the first shut-off valve, the lubricating oil isolated comes back to oil storage tank, and gaseous working medium then enters
Condenser, into next circulation.Since expanding machine is in off state, therefore remaining in will for the lubricating oil in oil return subsystem
Slowly it is recycled in oil storage tank.
Compared with prior art, the beneficial effects of the invention are as follows：It realizes to lubricating oil oil temperature supplying, charge oil pressure and confession
Oil mass is accurately regulated and controled, it is ensured that expanding machine is steadily efficiently run under suitable fuel delivery, while making to run oil mass dimension
It holds in lower level；In addition, can effectively be recycled to the lubricating oil in other each components remained in outside expanding machine, i.e.,
Operating cost is reduced, thermal efficiency of cycle is also improved；Device structure is simple, high degree of automation, saves electric power, entire design letter
Clean efficiently good manufacturability occupies little space, and economic cost is low, has very big future in engineering applications.
Detailed description of the invention
Fig. 1 is the overall structure block diagram for the expanding machine oil return feeding system that the present invention can monitor automatically；
Fig. 2 is that the control unit for the expanding machine oil return feeding system that the present invention can monitor automatically connects block diagram；
Fig. 3 is the flow chart element of the determination method of oil overheating degree in the expanding machine oil return feeding system of the invention that can be monitored automatically
Figure；
Fig. 4 is the operation schematic diagram for the expanding machine oil return feeding system normal fuel injection mode that the present invention can monitor automatically；
Fig. 5 is the operation schematic diagram that the expanding machine oil return feeding system that the present invention can monitor automatically runs oily take-back model.
Specific embodiment
The present invention is further detailed with reference to the accompanying drawing, arrow show media processes direction in figure.
The expanding machine oil return feeding system that the present invention can monitor automatically is mainly used in Organic Rankine Cycle, to expanding machine into
The accurate fuel feeding of row, and the lubricants capacity of system is monitored, the oily take-back model of race is switched to when necessary, has ensured expanding machine
Safe and highly efficient operation, while improving the thermal efficiency of cycle of system.It includes working cycles subsystem and for oil return subsystem, described
Working cycles subsystem includes expanding machine 13, gs-oil separator 2, condenser 5, working medium pump 8 and evaporator 11, the expanding machine 13
Connect with gs-oil separator 2, the gs-oil separator 2 is connect with the condenser 5, the condenser 5 is connect with working medium pump 8,
The working medium pump 8 is connect with evaporator 11, the evaporator 11 is connect with expanding machine 13, and above-mentioned each component is sequentially connected in series composition
Basic ORC system.Regenerator 9 is set between the working medium pump 8 and evaporator 11.Described for oil return subsystem includes oil gas point
From device 2, oil storage tank 3, oil strainer 6, scavenge oil pump 7, regenerator 9, first flow regulating valve FV1 and second flow regulating valve FV2,
The gs-oil separator 2 is connect with oil storage tank 3, and the oil storage tank 3 is connect with, oil strainer 6, the oil strainer 6 and, oil return
7 connection of pump, the scavenge oil pump 7 are connect with described, regenerator 9 with the expanding machine 13, the first flow regulating valve FV1 installation
The pipeline between regenerator 9 and the expanding machine 13 is connect at one end, between the other end and gs-oil separator 2 and oil storage tank 3
Pipeline connection pipeline branch road.The second flow regulating valve FV2 is mounted on the pipeline branch connecting with 9 both ends of regenerator
On.The regenerator 9 is with heat exchanger.Working medium passage and grease channel are equipped in the regenerator 9, the lubricating oil is logical
The both ends in road are separately connected the scavenge oil pump 7 and expanding machine 13, and the both ends of the working medium passage are separately connected 8 He of working medium pump
Evaporator 11.The scavenge oil pump 7 is frequency conversion oil pump, is equipped with frequency converter V/F, can pass through the frequency of change frequency converter, realization pair
The regulation of fuel feeding oil pressure.The gs-oil separator 2 is mounted on the exit of the expanding machine 13, is used for gaseous working medium and liquid
Lubricating oil separation is opened.Oil storage tank 3 is located at after gs-oil separator 2, the lubricating oil for stocking system.The regenerator 9 goes out
Mouth connects the inlet of the expanding machine 13, and one end of the first flow regulating valve FV1 is connected to the outlet of the regenerator 9
Between the entrance of the expanding machine 13, the other end of the first flow regulating valve FV1 connects the entrance of the oil storage tank 3
Place.The second flow regulating valve FV2 is installed in parallel in the both ends of the regenerator 9, and control enters the oil of the regenerator 9
Amount.
Wherein, the gs-oil separator 2 is equipped with sender property outlet and lubricating oil outlet, and the sender property outlet passes through working medium pipeline
The condenser 5 is connected, the lubricating oil outlet connects the oil storage tank 3；Also working medium passage and profit are equipped in the regenerator 9
Oil pathway, the both ends of the grease channel are separately connected the scavenge oil pump 7 and expanding machine 13, the both ends of the working medium passage
It is separately connected the working medium pump 8 and evaporator 11, the lubricating oil of high temperature enters in the grease channel and working medium passage of regenerator 9
Cryogenic fluid exchange heat, reduce oil temperature.
As shown in Fig. 2, further including having control unit, described control unit includes controller 1, photoelectric level inductor 4,
One temperature sensor 18, second temperature sensor 16, first pressure sensor 15, second pressure sensor 17, the first thermocouple
12 and second thermocouple 10.The photoelectric level inductor 4 is mounted in the oil storage tank 3, utilizes 4 light of photoelectric level inductor
Electrotransformation principle judges whether the oil level in oil storage tank 3 reaches preset minimum oil level.First temperature sensor 18 and
One pressure sensor 15 is mounted on the inlet of expanding machine 13, and the second temperature sensor 16 and second pressure sensor 17 are pacified
On the working medium pipeline in 13 exit of expanding machine, first thermocouple 12 is installed on the oil sump base wall of the expanding machine 13
At face, the connection that second thermocouple 10 is installed on the first flow regulating valve FV1 and the regenerator 9 crosses (expansion
At the fuel feeding of machine 13) at；The photoelectric level inductor 4, the first temperature sensor 18, second temperature sensor 16, first are pressed
Force snesor 15, second pressure sensor 17, the first thermocouple 12 and the second thermocouple 10 pass through encoder (data collector)
Controller 1 described in 14 data connections, the control of controller 1 connect the scavenge oil pump 7, first flow regulating valve FV1 and second
Flow control valve FV2.
Wherein, photoelectricity oil level inductor 4 is arranged at the preset minimum liquid level of oil storage tank 3, by infrared transmitter and reception
Board group at, when oil level lower than preset minimum oil level (i.e. the installation site of photoelectricity oil level inductor) when, the transmitting of infrared transmitter
Light is directed through air rather than lubricating oil, and this variation will generate electric signal, and indication 3 liquid level of oil storage tank is too low, and by electric signal
It is transmitted to encoder (data collector) 14, a starting foundation of oily mode is run as system；Scavenge oil pump 7 is mounted on regenerator
It is control foundation with the pressure of 13 inlet of expanding machine, by changing the running frequency of scavenge oil pump 7, it can be achieved that scavenge oil pump before 9
The change of 7 outlet pressure, to adapt to different operating conditions；Cooling heat exchanger of the regenerator 9 as lubricating oil, by utilizing working medium
The cooling capacity of working medium is at pump discharge with cutting oil, and the heat of lubricating oil can be used as a part of waste heat and be recycled.
It further include having race oil recycling control unit, the race oil recycling control unit includes the first shut-off valve SV1, second
Shut-off valve SV2 and third shut-off valve SV3, the second shut-off valve SV2 be installed on the evaporator 11 and the expanding machine 13 it
Between working medium pipeline on, the third shut-off valve SV3 is installed on the working medium between the expanding machine 13 and the gs-oil separator 2
On pipeline, the first shut-off valve SV1 is installed on the arrival end of the second shut-off valve SV2 with the third shut-off valve SV3's
It between outlet end, and is in be arranged in parallel with the second shut-off valve SV2 and third shut-off valve SV3.The controller 1 connects described
First shut-off valve SV1, the second shut-off valve SV2 and third shut-off valve SV3, by the first shut-off valve (can be electric check valve) SV1
With the second shut-off valve SV2, third shut-off valve (can be working medium circuit by-passing valve) SV3, gs-oil separator 2, have photoelectricity oil level
Oil storage tank 3, working medium pump 8, evaporator 11, the condenser 5 of inductor 4 constitute the race oil recycling subsystem of whole system.
As shown in figure 3, the present invention uses judgment basis of the oil overheating degree as expanding machine fuel feeding situation, oil overheating degree
Definition be that lubricating oil temperature in expanding machine subtracts the saturation temperature of working medium under the operating pressure (high pressure chest expanding machine takes air-breathing
Pressure, low pressure chamber expanding machine take pressure at expulsion), oil overheating degree is a relative value, and characterization lubricating oil exceeds its original state
Degree.Default oil overheating degree under different operating conditions is also different, can determine that different works by following round-robin method
Oil overheating degree under condition：
S1., expanding machine air extractor is set, extracts working medium/oil mixture in expanding machine, and by working medium and lubricate
Oil separation, calculates the actual solubility of lubricating oil under the operating condition；
S2. according to the running temperature of expanding machine, pressure, lubrication when solubility-Pressure/Temperature figure being taken to obtain normal fuel injection is looked into
The theoretical dissolution degree of oil；
S3. theoretical dissolution degree and actual solubility are compared, whether both is judged close to ()；
If S4. the two is close, oil overheating degree is calculated, and in this, as the default oil temperature mistake of expanding machine under the operating condition
Temperature carries out S5；If the departure of the two is more than preset value, fuel delivery is adjusted, theoretical dissolution degree is close to, returns again to
S1；
S5. the operating pressure and running temperature for changing expanding machine, return to S1, carry out cyclic test, finally draw out each work
Default oil overheating degree-Pressure/Temperature figure under condition.
The course of work of the invention is as follows：
1, expanding machine normal fuel injection mode：As shown in figure 4, when the liquid in the photoelectric level inductor 4 detection oil storage tank 3
When position is more than preset minimum liquid level, oil supply subsystem and oil return subsystem are worked normally；Lubricating oil is flowed out from oil storage tank 3,
Enter scavenge oil pump 7 after oil strainer 6, scavenge oil pump 7 provides recycle stream power for lubricating oil, and controller 1 is according to first pressure
Sensor 18 (measurement expander inlet pressure) is by changing the running frequency of scavenge oil pump 7 to control charge oil pressure；Then, it reaches
The lubricating oil of default charge oil pressure is divided into two-way, enters regenerator 9 all the way and cools down, another way passes through first flow regulating valve
FV1, and mixed in 9 exit of regenerator with the lubricating oil after cooling, controller 1 is fed back according to the second thermocouple 10
Temperature value, adjusts the aperture of second flow control valve FV2, to control the flow of lubrication for participating in heat exchange, and then realizes fuel feeding
The control of temperature；Controller 1 determines fuel delivery according to default oil overheating degree-Pressure/Temperature figure, therefore the lubricating oil that part is extra
Oil storage tank 3 is come back to by first flow control valve FV1, another part lubricating oil is transported to 13 inlet of expanding machine, with
Base bearing and each friction for entering expanding machine 13 after working medium mixing are secondary；Finally, complete lubrication after lubricating oil/working medium mixture into
Enter gs-oil separator 2 to be separated, the gaseous working medium after separation enters condenser 5, and liquid lubricant returns to oil storage tank 3, starts
New circulation.
During expanding machine 13 is for oil return mode operation, data collector 14 is by acquiring at 13 bottom oil sump of expanding machine
Electric thermo-couple temperature value and expander outlet/inlet pressure value (depending on the type of apparent expansion machine 13, high pressure chest expanding machine 13
Take pressure of inspiration(Pi), low pressure chamber expanding machine 13 such as inlet pressure) and controller 1 is transmitted signals to, controller 1 passes through calculation process
After obtain oil overheating degree, thus as the control foundation of fuel delivery, regulate and control the aperture of first flow regulating valve FV1；Scavenge oil pump 7
Using 13 inlet pressure of expanding machine as control foundation, the running frequency of scavenge oil pump 7 is adjusted, charge oil pressure is made to be slightly above expanding machine 13
Inlet pressure；The oil temperature supplying of lubricating oil should control between 30 DEG C -50 DEG C, therefore control system passes through thermocouple at analysis fuel feeding
The temperature value of (the first thermocouple 12 and the second thermocouple 10), regulates and controls the aperture of second flow regulating valve FV2, and control enters backheat
The lubricants capacity of device 9 realizes the control of oil temperature supplying.
2, oily take-back model is run：As shown in figure 5, when the liquid level in the photoelectric level inductor 4 detection oil storage tank 3 is lower than
When preset minimum liquid level, system switches to the oily take-back model of race, and oil return subsystem stops working.At this point, the controller 1 is controlled
Scavenge oil pump 7 processed is shut down, meanwhile, the first shut-off valve SV1 of control is opened, and is controlled the second shut-off valve SV2 and third shut-off valve SV3 and is closed
It closes, and the stroke of working medium pump 8 increases, and increases the flow of oil supply subsystem.The working medium of lubricating oil is carried with higher stream
Speed successively passes through condenser 5, working medium pump 8, regenerator 9 and evaporator 11, enters oil gas after then passing through the first shut-off valve SV1
Separator 2, the lubricating oil isolated comes back to oil storage tank 3, and gaseous working medium then enters condenser 5, into next circulation.
Since expanding machine 13 is in off state, therefore the lubricating oil remained in working cycles subsystem will slowly be recycled to oil storage tank 1
In.
Compared with prior art, the present invention has the advantage that：
1, it is provided with regenerator in 5 exit of scavenge oil pump, is lubricating oil by the cooling capacity using working medium pump exit working medium
Cooling, not only eliminates oil cooler, but also the heat released in lubricating oil temperature-fall period also can be used as one of waste heat
Divide and recycled, realizes that working medium enters the preheating before evaporator, and then reduce the heat exchange area of evaporator, improve heat exchange and imitate
Rate；
2, scavenge oil pump use frequency conversion oil pump, can auto-control charge oil pressure have to the adaptable of the various variable working condition of ORC
Prevent charge oil pressure caused by the change due to expander inlet pressure too low or too high to effect；
3, it is provided with the bypass circulation of installation second flow regulating valve FV2 on regenerator, and passes through the electricity on circuit
Dynamic regulating valve control enters the lubricants capacity of regenerator, and then controls the oil temperature supplying (generally 30-50 DEG C) of lubricating oil；
4, the bypass circulation of installation first flow regulating valve FV1 is provided at the fuel feeding of expanding machine, controller is according to number
According to the data that acquisition system is fed back, the fuel feeding situation (rich oil/oil starvation) of expanding machine is judged, to adjust electric check valve thereon
Realize the control of fuel delivery；
5, photoelectricity oil level inductor is provided on oil storage tank, when minimum oil level of the oil level in oil storage tank lower than setting,
The electric signal of generation is sent to data collector by photoelectricity oil level inductor, and triggers alarm；
6, using oil overheating degree as expanding machine rich oil/oil starvation judgment basis, the definition of oil overheating degree is oil temperature
The saturation temperature of the working medium to work at this pressure is subtracted, for characterizing the temperature value that lubricating oil exceeds original state.Oil temperature mistake
Temperature can reflect the fuel feeding situation of expanding machine relatively reasonablely；
7, it is provided with the bypass circulation of the first shut-off valve SV1 of installation on expanding machine, and passes through 3 electronic section in system
Only valve realizes the recovery operation for running oil.After controller is received from the electric signal of photoelectricity oil level inductor, race will be switched to
Oily take-back model makes the mixture of working medium and lubricating oil avoid expanding machine and is directly over by-passing valve, improves the recycling effect of lubricating oil
Rate.
As described above, only presently preferred embodiments of the present invention, when cannot be limited the scope of implementation of the present invention with this,
I.e. generally according to simple equivalent changes and modifications made by scope of the present invention patent and invention description content, all still belong to the present invention
In the range of patent covers.
Claims (8)
1. the expanding machine oil return feeding system that one kind can monitor automatically, which is characterized in that including working cycles subsystem and for oil return
Subsystem, the working cycles subsystem include expanding machine, gs-oil separator, condenser, working medium pump and evaporator, the expansion
Machine is connect with gs-oil separator, the gs-oil separator is connect with the condenser, the condenser connect with working medium pump, is described
Working medium pump is connect with evaporator, and the evaporator is connect with expanding machine, and regenerator is arranged between the working medium pump and evaporator；
It is described for oil return subsystem include gs-oil separator, oil storage tank, oil strainer, scavenge oil pump, regenerator, first flow regulating valve and
Second flow regulating valve, the gs-oil separator are connect with oil storage tank, and the oil storage tank is connect with oil strainer, the oil filtering
Device is connect with scavenge oil pump, and the scavenge oil pump is connect with the regenerator with the expanding machine, the first flow regulating valve installation
The pipeline between regenerator and the expanding machine is connect at one end, the pipeline between the other end and gs-oil separator and oil storage tank
The pipeline branch road of connection, the second flow regulating valve are mounted on the pipeline branch road connecting with regenerator both ends.
2. the expanding machine oil return feeding system that one kind according to claim 1 can monitor automatically, which is characterized in that the oil gas
Separator is equipped with sender property outlet and lubricating oil outlet, and the sender property outlet connects the condenser, the lubricating oil outlet connection
The oil storage tank.
3. the expanding machine oil return feeding system that one kind according to claim 1 can monitor automatically, which is characterized in that the backheat
Working medium passage and grease channel are equipped in device, the both ends of the grease channel are separately connected the scavenge oil pump and expanding machine,
The both ends of the working medium passage are separately connected the working medium pump and evaporator.
4. the expanding machine oil return feeding system that one kind according to claim 1 can monitor automatically, which is characterized in that further include having
Control unit, described control unit include controller, photoelectric level inductor, the first temperature sensor, first pressure sensor,
First thermocouple and the second thermocouple；The photoelectric level inductor is mounted in the oil storage tank, first temperature sensing
Device and first pressure sensor are mounted at expander inlet, and first the installation of TC is in the oil sump bottom of the expanding machine
Portion, second the installation of TC is in the connection intersection of the first flow regulating valve and the regenerator；The photoelectricity liquid
It is controlled described in position inductor, the first temperature sensor, first pressure sensor, the first thermocouple and the second thermocouple data connection
Device control, the controller control connect the scavenge oil pump, first flow regulating valve and second flow regulating valve.
5. the expanding machine oil return feeding system that one kind according to claim 4 can monitor automatically, which is characterized in that further include having
First shut-off valve, the second shut-off valve and third shut-off valve, second shut-off valve are installed on the evaporator and the expanding machine
Between, the third shut-off valve is installed between the expanding machine and the gs-oil separator, the first shut-off valve parallel connection peace
The outlet end of arrival end and the third shut-off valve loaded on second shut-off valve, the controller control connection described first
Shut-off valve, the second shut-off valve and third shut-off valve.
6. a kind of control method of the expanding machine oil return feeding system according to claim 5 that can be monitored automatically, feature exist
In, when the liquid level in photoelectric level inductor detection oil storage tank is more than preset minimum liquid level, working cycles subsystem
It is worked normally with for oil return subsystem；Lubricating oil is flowed out from oil storage tank, and oil pump is entered after oil strainer, and oil pump is lubrication
Oil provides recycle stream power, the pressure value that controller is fed back according to first pressure sensor, by the operation frequency for changing scavenge oil pump
Rate is to control charge oil pressure；Then, the lubricating oil for reaching default charge oil pressure is divided into two-way, enters regenerator all the way and is dropped
Temperature, another way passes through first flow regulating valve, and is mixed in regenerator exit with the lubricating oil after cooling, controller
Further according to the temperature value of the second thermocouple feedback, the aperture of second flow control valve is adjusted, to control the lubrication for participating in heat exchange
Oil stream amount, extra lubricating oil come back to oil storage tank by first flow control valve, and another part lubricating oil is transported to swollen
Swollen machine inlet, lubricating oil/working medium mixture after lubrication is completed in expanding machine enter gs-oil separator and are separated, separated
Gaseous working medium afterwards enters condenser, and liquid lubricant returns to oil storage tank, starts new circulation.
7. the control method for the expanding machine oil return feeding system that one kind according to claim 6 can monitor automatically, feature exist
In, when the liquid level in photoelectric level inductor detection oil storage tank is lower than preset minimum liquid level, the controller control
Oil pump is shut down, meanwhile, the first shut-off valve of control is opened, and controls the second shut-off valve and third shut-off valve is closed, working cycles subsystem
The working medium that lubricating oil is carried in system successively passes through condenser, working medium pump, regenerator and evaporator, then passes through the first cut-off
Enter gs-oil separator after valve, the lubricating oil isolated comes back to oil storage tank, and gaseous working medium then enters condenser, under
One circulation.
8. the control method for the expanding machine oil return feeding system that one kind according to claim 7 can monitor automatically, feature exist
In determining the oil overheating degree under different operating conditions by following method and step：
S1., expanding machine air extractor is set, extracts working medium/oil mixture in expanding machine, and by working medium and lubricate oil
From calculating the actual solubility of lubricating oil under the operating condition；
S2. according to the running temperature of expanding machine, pressure, lubricating oil when solubility-Pressure/Temperature figure being taken to obtain normal fuel injection is looked into
Theoretical dissolution degree；
S3. theoretical dissolution degree and actual solubility are compared, judges whether the two approaches；
If S4. the two is close, oil overheating degree is calculated, and in this, as the default oil overheating of expanding machine under the operating condition
Degree；If the departure of the two is more than preset value, fuel delivery is adjusted, theoretical dissolution degree is close to, returns again to S1.
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