CN116181458B - System and method for regulating and controlling regeneration of diesel engine particle catcher - Google Patents
System and method for regulating and controlling regeneration of diesel engine particle catcher Download PDFInfo
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- CN116181458B CN116181458B CN202310289836.7A CN202310289836A CN116181458B CN 116181458 B CN116181458 B CN 116181458B CN 202310289836 A CN202310289836 A CN 202310289836A CN 116181458 B CN116181458 B CN 116181458B
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- 239000002245 particle Substances 0.000 title claims abstract description 55
- 230000008929 regeneration Effects 0.000 title claims abstract description 42
- 238000011069 regeneration method Methods 0.000 title claims abstract description 42
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 35
- 230000001276 controlling effect Effects 0.000 title abstract description 7
- 230000003647 oxidation Effects 0.000 claims abstract description 25
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 25
- 230000003197 catalytic effect Effects 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 238000000746 purification Methods 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 16
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 19
- 239000002253 acid Substances 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 238000010531 catalytic reduction reaction Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
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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
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/065—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle the combustion taking place in an internal combustion piston engine, e.g. a diesel engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/0205—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using heat exchangers
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention belongs to the technical field of energy conservation of internal combustion engines, and discloses a system for regulating and controlling regeneration of a diesel engine particle catcher, which comprises a diesel engine system, an Organic Rankine Cycle (ORC) system, a coupling component and a control system; the diesel engine system comprises a diesel engine, an oxidation catalytic converter and a first exhaust pipeline; the coupling assembly comprises an evaporator and a Diesel Particulate Filter (DPF) which are coupled into a whole, wherein the evaporator comprises an evaporator shell and evaporator fins; according to the invention, the evaporator in the ORC system is coupled with the DPF into a whole, so that not only is the rise of the exhaust back pressure of the diesel engine caused by adding the ORC avoided, but also the exhaust temperature of the diesel engine is reduced through the ORC, so that the thickness of the carbon layer in the DPF is always kept at the thickness of the carbon layer corresponding to the condition that the working performance of the DPF is optimal, the control of the DPF regeneration reaction is realized, and the purification rate of the DPF is further ensured.
Description
Technical Field
The invention relates to the technical field of energy conservation of internal combustion engines, in particular to a system and a method for regulating and controlling regeneration of a diesel particulate trap.
Background
The diesel engine is widely applied to the fields of transportation, agricultural machinery, engineering machinery and the like by virtue of good economical efficiency and dynamic property. However, the inherent combustion causes serious problems in exhaust emission, wherein the most important emission is particulate matters (Particulate Matter, PM) which have serious influence on human bodies and environment.
As one of the diesel exhaust aftertreatment technologies required by the national six-emission regulations, a Diesel Particulate Filter (DPF) is widely popularized due to its efficient purification of particulate matters in diesel exhaust, but its purification rate is severely affected by high-temperature exhaust of a diesel engine, which is mainly represented by that the excessive temperature of diesel exhaust may cause the reduction of the DPF purification rate. The DPF is characterized in that the inner wall of the DPF forms a carbon layer due to the adsorption of particulate matters in the process of trapping the particulate matters, and the purification rate of the DPF is increased along with the increase of the carbon layer and then basically keeps unchanged; however, an excessively high exhaust gas temperature may cause oxidation (regeneration reaction) of the carbon layer and discharge with the exhaust gas, thereby causing a decrease in the DPF purification rate. Therefore, reducing the exhaust temperature of the diesel engine to control the regeneration reaction, so that the thickness of the carbon layer in the DPF is always kept at the thickness corresponding to the thickness when the working performance is optimal, and the method is an effective method for improving the purification rate of the DPF.
In addition, related studies have shown that about 30-45% of the energy is lost in the form of high temperature exhaust in the thermodynamic equilibrium of a diesel engine; as a diesel exhaust heat recovery technology, an Organic Rankine Cycle (ORC) can not only efficiently recover diesel exhaust energy but also reduce exhaust temperature. Therefore, it can be used to recover the energy of the exhaust gas of the diesel engine to improve the thermal efficiency thereof. However, in the practical application process, the addition of the ORC system to the DPF tends to cause an increase in exhaust back pressure, which in turn causes a decrease in the power and economy of the diesel engine itself.
Disclosure of Invention
The invention aims to provide a system and a method for regulating and controlling the regeneration of a diesel particulate filter, which are used for coupling an evaporator in an ORC system and a DPF into a whole, so that the rise of the exhaust back pressure of the diesel engine caused by adding the ORC is avoided, the exhaust temperature of the diesel engine is reduced through the ORC, the thickness of the carbon layer in the DPF is always kept at the thickness of the carbon layer corresponding to the condition that the working performance of the DPF is optimal, the regeneration reaction is controlled, and the purification rate of the DPF is further ensured.
In order to achieve the above object, the present invention provides the following technical solutions:
a system for regulating and controlling regeneration of a diesel particulate filter comprises a diesel engine system, an organic Rankine cycle system, a coupling component and a control system;
The diesel engine system comprises a diesel engine, an oxidation catalytic converter and a first exhaust pipeline;
The coupling assembly comprises an evaporator and a diesel particulate filter which are coupled into a whole, the evaporator comprises an evaporator shell and evaporator fins, the evaporator fins are arranged on the diesel particulate filter, and the evaporator shell is provided with an exhaust inlet, an exhaust outlet, an organic working medium inlet and an organic working medium outlet;
the organic Rankine cycle system comprises an evaporator, an expander, a generator, a condenser, an organic working medium liquid storage tank, a working medium pump, an organic working medium pipeline and a second exhaust pipeline;
The control system comprises a frequency converter, a control unit, a first temperature sensor, a mass flow sensor, a first pressure sensor, a second pressure sensor and a second temperature sensor;
The diesel engine is communicated with an inlet of the oxidation catalytic converter, and an outlet of the oxidation catalytic converter is communicated with the exhaust inlet through the first exhaust pipeline; the original exhaust gas of the diesel engine is purified by the oxidation catalytic converter and then enters the diesel particulate filter, and heat exchange is carried out through the evaporator fins and the wall surface of the diesel particulate filter; the second exhaust pipeline is arranged at the exhaust outlet and communicated with the air outlet of the diesel particulate filter, so that the exhaust purified by the diesel particulate filter is directly discharged into the atmosphere;
The organic working medium inlet is sequentially connected with the working medium pump, the organic working medium liquid storage tank, the condenser and the expander through the organic working medium pipeline and then communicated with the organic working medium outlet so as to realize the circulating flow of the organic working medium in the organic Rankine cycle system;
The expander is coaxially connected with the generator so as to realize conversion from mechanical energy to electric energy; the frequency converter is connected with the working medium pump through an electric lead; the control unit is connected with the frequency converter, the first temperature sensor, the mass flow sensor, the first pressure sensor, the second pressure sensor and the second temperature sensor through electric wires to control the operation of the control unit, the first temperature sensor, the mass flow sensor and the first pressure sensor are arranged between the oxidation catalytic converter and the diesel engine particle catcher, and the second pressure sensor and the second temperature sensor are arranged at the second exhaust pipeline.
When the diesel engine starts to operate, the first temperature sensor and the mass flow sensor respectively measure exhaust temperature signals and mass flow signals flowing out of the oxidation catalytic converter and transmit the exhaust temperature signals and the mass flow signals to the control unit, and the control unit judges according to the exhaust temperature and outputs corresponding instructions:
When the exhaust temperature of the oxidation catalytic converter is higher than the regeneration temperature T rec of the diesel particulate filter, the diesel particulate filter has regeneration conditions, and the organic Rankine cycle system is mainly used for temperature control; then, whether the organic Rankine cycle system is started or not is further judged, the control unit respectively collects signals of the first pressure sensor and the second pressure sensor, and differential pressure is calculated and judged according to the following formula:
ΔP＝P1-P2
Wherein DeltaP is the pressure difference of the exhaust gas of the diesel engine before and after passing through the diesel particulate filter, and MPa; p 1 is the pressure of the diesel exhaust gas flowing into the diesel particulate filter, and MPa; p 2 is the pressure at which the diesel exhaust exits the diesel particulate filter, MPa.
Further, when the control unit controls the working medium pump to work and the pressure difference delta P is larger than the diesel engine exhaust pressure difference P measured under the minimum carbon layer thickness corresponding to the maximum purification rate of the diesel engine particle catcher, the diesel engine particle catcher needs to be regenerated and the organic Rankine cycle system is not started;
When the diesel engine exhaust flows into the diesel engine particle catcher from the first exhaust pipeline, the exhaust entering the diesel engine particle catcher is not cooled because the organic Rankine cycle system is not operated, and then the regeneration reaction of the diesel engine particle catcher is spontaneously carried out.
Further, when the control unit does not spray oil or the exhaust back pressure is smaller than the diesel exhaust pressure difference P measured under the minimum carbon layer thickness corresponding to the maximum purification rate of the diesel particle catcher, the diesel particle catcher does not need to be regenerated, and at the moment, the organic Rankine cycle system is started to regulate and control the exhaust temperature and recover the exhaust energy;
When the diesel engine exhaust flows into the diesel engine particle catcher from the first exhaust pipeline, the organic Rankine cycle system operates, the diesel engine exhaust entering the diesel engine particle catcher exchanges heat with the organic working medium through the evaporator fins and the wall surface of the diesel engine particle catcher to cool, and then is discharged through the second exhaust pipeline, so that the regeneration reaction of the diesel engine particle catcher does not occur.
Further, when the diesel engine exhaust enters the diesel engine particle catcher to exchange heat with the organic working medium, the control unit calculates an outlet exhaust temperature target value of the diesel engine particle catcher according to the following formula;
Tout(exh)＝T90(scr)
Wherein T out(exh) is an exhaust outlet temperature target value K of the diesel particulate filter; t 90(scr) is the light-off temperature, K, of a selective catalytic reduction system arranged behind the diesel particulate filter, and the numerical value is obtained by looking up a table;
Then the exhaust heat release quantity of the diesel engine is calculated by the following formula;
Wherein c p(exh) is the specific constant pressure heat capacity of the exhaust gas of the diesel engine, and the value is obtained by looking up a table, kJ/(kg.K); the mass flow of the exhaust gas of the diesel engine is measured by a mass flow sensor, and kg/s; t in(exh) is the temperature of the exhaust gas of the diesel engine before entering the diesel particulate filter, and is measured by a first temperature sensor, K; t out(exh) is the exhaust outlet temperature target value of the diesel particulate filter, K;
The convective heat transfer temperature difference between the organic working medium and the exhaust of the diesel engine and the organic working medium heat absorption capacity are respectively calculated by the following two formulas;
Wherein DeltaT is the temperature difference of convection heat exchange between the organic working medium and the exhaust gas of the diesel engine, K; k is the heat exchange coefficient of the evaporator, and kW/(m 2. K) is obtained by looking up a table; a is the heat exchange area of the evaporator, namely the sum of the surface area of the evaporator fin and the area of the outer wall of the diesel particulate filter, m 2;
in the method, in the process of the invention, Absorbing heat for organic working medium, kW; /(I)Heat release is carried out on exhaust gas of the diesel engine, and kW is carried out; η evap is the heat exchange efficiency of the evaporator, and the numerical value is obtained from the data of the evaporator;
and then the temperature of the organic working medium after heat exchange of the evaporator is calculated by the following formula:
Wherein T out(ref) is the temperature of the organic working medium after heat exchange by the evaporator, and K; delta T is the temperature difference of convection heat exchange between the organic working medium and the exhaust gas of the diesel engine, K; t in(ref) is the temperature before the organic working medium enters the evaporator, and the value is 300K;
finally, calculating a mass flow target value of the organic working medium according to the following formula, and outputting and adjusting a rotating speed signal of the working medium pump by the control unit through the frequency converter so that the mass flow of the organic working medium reaches the target value;
in the method, in the process of the invention, Is the mass flow of the organic working medium, kg/s; c p(ref) is the specific constant pressure heat capacity of the organic working medium, and is obtained by looking up a table, kJ/(kg.K); t in(ref) is the temperature before the organic working medium enters the evaporator, and the value is 300K; t out(ref) is the temperature of the organic working medium after heat exchange by the evaporator, K;
Then, the second temperature sensor measures the actual value of the exhaust temperature of the outlet of the diesel particulate filter and transmits the actual value to the control unit, the control unit further adjusts the rotating speed of the working medium pump by taking the calculated value of the outlet exhaust temperature of the diesel particulate filter as a target value, and then adjusts the actual value of the exhaust temperature so as to achieve that the actual value of the outlet exhaust temperature of the diesel particulate filter approaches to the target value; the organic working medium and the exhaust gas of the diesel engine exchange heat and then enter an expansion machine to expand and do work to generate electricity and output to the outside, exhaust steam after doing work then flows to a condenser, is condensed into liquid state by the condenser and flows back to an organic working medium liquid storage tank to carry out the next cycle.
Further, when the temperature of the diesel exhaust is less than the regeneration temperature of the diesel particulate filter, the diesel particulate filter does not have the regeneration condition, and the organic Rankine cycle system is directly started and only used for recovering the energy of the exhaust;
When the exhaust gas of the diesel engine flows into the diesel engine particle catcher through the first exhaust pipeline, the exhaust gas exchanges heat with the organic working medium in the diesel engine particle catcher through the wall surface and the evaporator fins, and is then discharged through the second exhaust pipeline, and the regeneration reaction of the diesel engine particle catcher does not occur;
When the diesel engine exhaust enters the diesel engine particle catcher for heat exchange, the control unit sets the target value of the outlet exhaust temperature of the diesel engine particle catcher as the exhaust acid dew point temperature 423K; then the exhaust heat release quantity of the diesel engine is calculated by the following formula;
Wherein c p(exh) is the specific constant pressure heat capacity of the exhaust gas of the diesel engine, and the value is obtained by looking up a table, kJ/(kg.K); The mass flow of the exhaust gas of the diesel engine is measured by a mass flow sensor, and kg/s; t in(exh) is the temperature of the exhaust gas of the diesel engine before entering the diesel particulate filter, and is measured by a first temperature sensor, K; t out(exh) is the temperature of the diesel engine exhaust after heat exchange by the evaporator, and the value is 423K of the acid dew point temperature of the exhaust;
The convective heat transfer temperature difference between the organic working medium and the exhaust of the diesel engine and the organic working medium heat absorption capacity are respectively calculated by the following two formulas;
Wherein DeltaT is the temperature difference of convection heat exchange between the organic working medium and the exhaust gas of the diesel engine, K; k is the heat exchange coefficient of the evaporator, and kW/(m 2. K) is obtained by looking up a table; a is the heat exchange area of the evaporator, namely the sum of the surface area of the evaporator fin and the area of the outer wall of the diesel particulate filter, m 2;
in the method, in the process of the invention, Absorbing heat for organic working medium, kW; /(I)Heat release is carried out on exhaust gas of the diesel engine, and kW is carried out; η evap is the heat exchange efficiency of the evaporator, obtained from the evaporator data;
and then the temperature of the organic working medium after heat exchange of the evaporator is calculated by the following formula:
Wherein T out(ref) is the temperature of the organic working medium after heat exchange by the evaporator, and K; delta T is the temperature difference of convection heat exchange between the organic working medium and the exhaust gas of the diesel engine, K; t in(ref) is the temperature before the organic working medium enters the evaporator, and the value is 300K;
finally, calculating a mass flow target value of the organic working medium according to the following formula, and outputting and adjusting a rotating speed signal of the working medium pump by the control unit through the frequency converter so that the mass flow of the organic working medium reaches the target value;
in the method, in the process of the invention, Is the mass flow of the organic working medium, kg/s; c p(ref) is the specific constant pressure heat capacity of the organic working medium, and is obtained by looking up a table, kJ/(kg.K); t in(ref) is the temperature before the organic working medium enters the evaporator, and the value is 300K; t out(ref) is the temperature of the organic working medium after heat exchange by the evaporator, K;
And then the second temperature sensor measures the actual value of the exhaust temperature of the outlet of the diesel particulate filter and transmits the actual value to the control unit, the control unit further adjusts the rotating speed of the working medium pump by taking the value of the exhaust acid dew point temperature of the diesel engine as a target value, and further adjusts the actual value of the exhaust temperature so as to realize that the actual value of the outlet temperature of the diesel particulate filter approaches to the target value, the organic working medium exchanges heat with the diesel engine exhaust and then enters an expansion machine to expand and do work to generate electricity to be output outwards, exhaust steam after doing work then flows to a condenser, and flows back to the organic working medium liquid storage tank after being condensed into liquid state by the condenser for next cycle.
The technical proposal has the following principle and beneficial effects:
1. according to the invention, the ORC system is coupled and additionally arranged on the basis of the DPF, so that the exhaust energy of the diesel engine can be efficiently recovered, and the energy conversion efficiency is further improved;
2. The addition of ORC systems can lead to increased exhaust back pressure in the diesel engine, which in turn can lead to reduced power and economy of the diesel engine itself. Therefore, the evaporator in the ORC system is coupled with the DPF into a whole, so that the rise of exhaust back pressure of the diesel engine caused by adding the ORC can be avoided;
3. The purification rate of the DPF tends to be maintained after increasing with the increase of the carbon layer, and an excessively high exhaust temperature causes oxidation (regeneration reaction) of the carbon layer and discharge with the exhaust gas, thereby causing a decrease in the purification rate thereof. Therefore, when the purification rate of the DPF is not the maximum, the invention reduces the temperature of the exhaust gas of the diesel engine through the ORC system, thereby controlling the regeneration reaction and further ensuring the purification rate.
Drawings
FIG. 1 is a schematic diagram of the overall architecture of a system for regulating regeneration of a diesel particulate filter according to the present invention;
FIG. 2 is a schematic diagram of a system coupling assembly for regulating regeneration of a diesel particulate filter according to the present invention.
The names of the corresponding marks in the drawings are:
The diesel engine 1, the oxidation catalytic converter 2, the coupling component 3, the diesel particulate filter 3-1, the evaporator shell 3-2, the evaporator fin 3-3, the exhaust inlet 3-4, the exhaust outlet 3-5, the organic working medium inlet 3-6, the organic working medium outlet 3-7, the expander 4, the generator 5, the condenser 6, the organic working medium liquid storage tank 7, the working medium pump 8, the frequency converter 9, the control unit 10, the first exhaust pipeline 11-1, the second exhaust pipeline 11-2, the organic working medium pipeline 12, the first temperature sensor 13, the mass flow sensor 14, the first pressure sensor 15, the second pressure sensor 16 and the second temperature sensor 17.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and embodiments:
As shown in fig. 1 and 2, a system for regulating regeneration of a diesel particulate filter comprises a diesel engine system, an organic rankine cycle system, a coupling assembly 3 and a control system;
the diesel engine system comprises a diesel engine 1, an oxidation catalytic converter 2 and a first exhaust pipeline 11-1;
the coupling assembly 3 comprises an evaporator and a diesel particulate filter 3 which are coupled into a whole, the evaporator comprises an evaporator shell 3-2 and evaporator fins 3-3, the evaporator fins 3-3 are arranged on the diesel particulate filter 3, and the evaporator shell 3-2 is provided with an exhaust inlet 3-4, an exhaust outlet 3-5, an organic working medium inlet 3-6 and an organic working medium outlet 3-7;
the organic Rankine cycle system comprises an evaporator, an expander 4, a generator 5, a condenser 6, an organic working medium liquid storage tank 7, a working medium pump 8, an organic working medium pipeline 12 and a second exhaust pipeline 11-2;
The control system comprises a frequency converter 9, a control unit 10, a first temperature sensor 13, a mass flow sensor 14, a first pressure sensor 15, a second pressure sensor 16 and a second temperature sensor 17;
The diesel engine 1 is communicated with an inlet of the oxidation catalytic converter 2, and an outlet of the oxidation catalytic converter 2 is communicated with an exhaust inlet 3-4 through a first exhaust pipeline 11-1; the original exhaust gas of the diesel engine 1 is purified by the oxidation catalytic converter 2 and then enters the diesel particle catcher 3, and heat exchange is carried out through the evaporator fins 3-3 and the wall surface of the diesel particle catcher 3; the second exhaust pipeline 11-2 is arranged at the exhaust outlet 3-5 and communicated with the air outlet of the diesel particle catcher 3, so that the exhaust gas converted by the diesel particle catcher 3 is directly discharged into the atmosphere;
the organic working medium inlet 3-6 is sequentially connected with the working medium pump 8, the organic working medium liquid storage tank 7, the condenser 6 and the expander 4 through the organic working medium pipeline 12 and then is communicated with the organic working medium outlet 3-7 so as to realize the circulating flow of the organic working medium in the organic Rankine cycle system;
The expander 4 is coaxially connected with the generator 5 to realize conversion from mechanical energy to electric energy; the frequency converter 9 is connected with the working medium pump 8 through an electric lead; the control unit 10 is connected to the frequency converter 9, the expander 4, the first temperature sensor 13, the mass flow sensor 14, the first pressure sensor 15, the second pressure sensor 16 and the second temperature sensor 17 by electric wires to control the operation thereof, the first temperature sensor 13, the mass flow sensor 14 and the first pressure sensor 15 are arranged between the oxidation catalytic converter 2 and the diesel particulate trap 3, and the second pressure sensor 16 and the second temperature sensor 17 are arranged at the second exhaust pipeline 11-2.
When the diesel engine 1 starts to operate, the first temperature sensor 13 and the mass flow sensor 14 respectively measure an exhaust temperature signal and a mass flow signal flowing out of the oxidation catalytic converter 2 and transmit the exhaust temperature signal and the mass flow signal to the control unit 10, and the control unit 10 judges according to the exhaust temperature and outputs corresponding instructions:
When the exhaust temperature of the oxidation catalytic converter 2 is greater than the regeneration temperature T rec of the diesel particulate filter 3-1, the diesel particulate filter 3-1 has regeneration conditions, and the organic rankine cycle system is mainly used for temperature control; subsequently, whether to start the organic rankine cycle system is further determined, the control unit 10 collects signals of the first pressure sensor 15 and the second pressure sensor 16, respectively, calculates a differential pressure according to the following formula, and determines:
ΔP＝P1-P2
Wherein DeltaP is the pressure difference of the exhaust gas of the diesel engine before and after passing through the diesel particulate filter 3-1 and MPa; p 1 is the pressure of the diesel exhaust gas flowing into the diesel particulate filter 3-1, and MPa; p 2 is the pressure of the diesel exhaust flowing out of the diesel particulate filter 3-1, MPa;
When the control unit 10 controls the working medium pump 8 to work and the pressure difference delta P is larger than the diesel engine exhaust pressure difference P measured under the minimum carbon layer thickness corresponding to the maximum purification rate of the diesel engine particle catcher 3-1, the diesel engine particle catcher 3-1 needs to be regenerated and the organic Rankine cycle system is not started;
When the diesel exhaust flows into the diesel particulate filter 3-1 from the first exhaust line 11-1, the exhaust entering the diesel particulate filter 3-1 is not cooled due to the non-operation of the organic Rankine cycle system, and thus the regeneration reaction of the diesel particulate filter 3-1 is spontaneously performed.
When the control unit 10 does not spray oil or the exhaust back pressure is smaller than the diesel exhaust pressure difference P measured under the minimum carbon layer thickness corresponding to the maximum purification rate of the diesel particle catcher 3-1, the diesel particle catcher 3-1 does not need to be regenerated, and the organic Rankine cycle system is started to regulate and control the exhaust temperature and recover the exhaust energy;
When the diesel exhaust flows into the diesel particulate filter 3-1 from the first exhaust pipeline 11-1, the diesel exhaust entering the diesel particulate filter 3-1 exchanges heat with the organic working medium through the evaporator fins 3-3 and the wall surface of the diesel particulate filter 3-1 for cooling due to the operation of the organic Rankine cycle system, and is then discharged through the second exhaust pipeline 11-2, so that the regeneration reaction of the diesel particulate filter 3-1 does not occur.
When the diesel exhaust enters the diesel particulate filter 3-1 to exchange heat with the organic working medium, the control unit 10 first calculates an outlet exhaust temperature target value of the diesel particulate filter 3-1 according to the following formula;
Tout(exh)＝T90(scr)
Wherein T out(exh) is the target value of the exhaust outlet temperature of the diesel particulate filter 3-1, K; t 90(scr) is the light-off temperature, K, of the selective catalytic reduction system installed behind the diesel particulate trap 3-1, and the numerical lookup is obtained.
Then the exhaust heat release quantity of the diesel engine is calculated according to the following formula;
Wherein c p(exh) is the specific constant pressure heat capacity of the exhaust gas of the diesel engine, and the value is obtained by looking up a table, kJ/(kg.K); the mass flow of the exhaust gas of the diesel engine is measured by a mass flow sensor, and kg/s; t in(exh) is the temperature of the diesel exhaust before entering the diesel particle catcher 3-1, and is measured by a first temperature sensor, K; t out(exh) is the exhaust outlet temperature target value, K, of the diesel particulate filter 3-1;
The convective heat transfer temperature difference between the organic working medium and the exhaust of the diesel engine and the organic working medium heat absorption capacity are respectively calculated by the following two formulas;
Wherein K is the heat exchange coefficient of the evaporator, and kW/(m 2. K) is obtained by looking up a table; a is the heat exchange area of the evaporator, namely the sum of the surface area of the evaporator fins 3-3 and the area of the outer wall of the diesel particulate filter 3-1, and m 2; delta T is the temperature difference of convection heat exchange between the organic working medium and the exhaust gas of the diesel engine, K;
in the method, in the process of the invention, Absorbing heat for organic working medium, kW; /(I)Heat release is carried out on exhaust gas of the diesel engine, and kW is carried out; η evap is the heat exchange efficiency of the evaporator, and the numerical value is obtained from the data of the evaporator;
and then the temperature of the organic working medium after heat exchange of the evaporator is calculated by the following formula:
Wherein T out(ref) is the temperature of the organic working medium after heat exchange by the evaporator, and K; delta T is the temperature difference of convection heat exchange between the organic working medium and the exhaust gas of the diesel engine, K; t in(ref) is the temperature before the organic working medium enters the evaporator, and the value is 300K;
finally, calculating to obtain a mass flow target value of the organic working medium by the following formula, and outputting and adjusting a rotating speed signal of the working medium pump 8 by the control unit 10 through the frequency converter so that the mass flow of the organic working medium reaches the target value;
in the method, in the process of the invention, Is the mass flow of the organic working medium, kg/s; c p(ref) is the specific constant pressure heat capacity of the organic working medium, and is obtained by looking up a table, kJ/(kg.K); t in(ref) is the temperature before the organic working medium enters the evaporator, and the value is 300K; t out(ref) is the temperature of the organic working medium after heat exchange by the evaporator;
Then, the second temperature sensor 17 measures the actual value of the exhaust temperature of the outlet of the diesel particulate filter 3-1 and transmits the actual value to the control unit 10, and the control unit 10 further adjusts the rotating speed of the working medium pump 8 according to the target value of the exhaust temperature of the outlet of the diesel particulate filter 3-1, so as to adjust the actual value of the exhaust temperature, and further realize that the actual value of the exhaust temperature of the outlet of the diesel particulate filter 3-1 approaches to the target value; the organic working medium and the exhaust gas of the diesel engine exchange heat and then enter the expansion machine 4 to expand and do work to generate electricity and output to the outside, and exhaust steam after doing work then flows to the condenser 6, is condensed into liquid state by the condenser 6 and then flows back to the organic working medium liquid storage tank 7 to carry out the next cycle.
When the exhaust temperature of the diesel engine is less than the regeneration temperature of the diesel particulate filter 3-1, the diesel particulate filter 3-1 does not have the regeneration condition, and the organic Rankine cycle system is directly started and only used for recovering the energy of the exhaust;
when the diesel engine exhaust flows into the diesel engine particle catcher 3-1 through the first exhaust pipeline 11-1, the exhaust exchanges heat with the organic working medium in the diesel engine particle catcher 3-1 through the wall surface and the evaporator fins 3-3, and is then discharged through the second exhaust pipeline 11-2, and the regeneration reaction of the diesel engine particle catcher 3-1 does not occur;
when the diesel exhaust enters the diesel particulate filter 3-1 to exchange heat, the control unit 10 sets the target value of the outlet exhaust temperature of the diesel particulate filter 3-1 to the exhaust acid dew point temperature 423K; then the exhaust heat release quantity of the diesel engine is calculated by the following formula;
Wherein c p(exh) is the specific constant pressure heat capacity of the exhaust gas of the diesel engine, and the value is obtained by looking up a table, kJ/(kg.K); The mass flow of the exhaust gas of the diesel engine is measured by a mass flow sensor 14, kg/s; t in(exh) is the temperature of the diesel exhaust before entering the diesel particulate filter 3-1, and is measured by the first temperature sensor 13, K; t out(exh) is the temperature of the diesel engine exhaust after heat exchange by the evaporator, and the value is 423K of the acid dew point temperature of the exhaust;
The convective heat transfer temperature difference between the organic working medium and the exhaust of the diesel engine and the organic working medium heat absorption capacity are respectively calculated by the following two formulas;
Wherein K is the heat exchange coefficient of the evaporator, and kW/(m 2. K) is obtained by looking up a table; a is the heat exchange area of the evaporator, namely the sum of the surface area of the evaporator fins 3-3 and the area of the outer wall of the diesel particulate filter 3-1, and m 2; delta T is the temperature difference of convection heat exchange between the organic working medium and the exhaust gas of the diesel engine, K;
in the method, in the process of the invention, Absorbing heat for organic working medium, kW; /(I)Heat release is carried out on exhaust gas of the diesel engine, and kW is carried out; η evap is the heat exchange efficiency of the evaporator, obtained from the evaporator data;
and then the temperature of the organic working medium after heat exchange of the evaporator is calculated by the following formula:
Wherein T out(ref) is the temperature of the organic working medium after heat exchange by the evaporator, and K; delta T is the temperature difference of convection heat exchange between the organic working medium and the exhaust gas of the diesel engine, K; t in(ref) is the temperature before the organic working medium enters the evaporator, and the value is 300K;
finally, calculating to obtain a target value of the mass flow of the organic working medium by the following formula, and outputting and adjusting a rotating speed signal of the working medium pump by the control unit 10 through the frequency converter 9 so that the mass flow of the organic working medium reaches the target value;
Wherein c p(ref) is the specific constant pressure heat capacity of the organic working medium, and is obtained by looking up a table, kJ/(kg.K); Is the mass flow of the organic working medium, kg/s; t in(ref) is the temperature before the organic working medium enters the evaporator, and the value is the ambient temperature, K; t out(ref) is the temperature of the organic working medium after heat exchange by the evaporator;
The actual value of the temperature of the exhaust gas at the outlet of the diesel particulate filter 3-1 is measured by the second temperature sensor 17 and is transmitted to the control unit 10, the control unit 10 further adjusts the rotating speed of the working medium pump 8 according to the target value of the temperature of the exhaust gas at the outlet of the diesel particulate filter 3-1, and then adjusts the actual value of the temperature of the exhaust gas so as to achieve the effect that the actual value of the temperature of the outlet of the diesel particulate filter 3-1 approaches to the target value, the organic working medium exchanges heat with the exhaust gas of the diesel engine and then enters the expansion machine 4 to expand and do work to generate power to be output, exhaust steam after doing work flows to the condenser 6, is condensed into liquid state by the condenser 6 and flows back to the organic working medium liquid storage tank 7 for the next cycle.
The foregoing is merely exemplary embodiments of the present application, and detailed technical solutions or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present application, and these should also be regarded as the protection scope of the present application, which does not affect the effect of the implementation of the present application and the practical applicability of the patent. The protection scope of the present application is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (6)
1. A system for regulating regeneration of a diesel particulate filter, comprising: the system comprises a diesel engine system, an organic Rankine cycle system, a coupling component and a control system;
The diesel engine system comprises a diesel engine, an oxidation catalytic converter and a first exhaust pipeline;
The coupling assembly comprises an evaporator and a diesel particulate filter which are coupled into a whole, the evaporator comprises an evaporator shell and evaporator fins, the evaporator fins are arranged on the diesel particulate filter, and the evaporator shell is provided with an exhaust inlet, an exhaust outlet, an organic working medium inlet and an organic working medium outlet;
the organic Rankine cycle system comprises an evaporator, an expander, a generator, a condenser, an organic working medium liquid storage tank, a working medium pump, an organic working medium pipeline and a second exhaust pipeline;
The control system comprises a frequency converter, a control unit, a first temperature sensor, a mass flow sensor, a first pressure sensor, a second pressure sensor and a second temperature sensor;
The diesel engine is communicated with an inlet of the oxidation catalytic converter, and an outlet of the oxidation catalytic converter is communicated with the exhaust inlet through the first exhaust pipeline; the original exhaust gas of the diesel engine is purified by the oxidation catalytic converter and then enters the diesel particulate filter, and heat exchange is carried out through the evaporator fins and the wall surface of the diesel particulate filter; the second exhaust pipeline is arranged at the exhaust outlet and communicated with the air outlet of the diesel particulate filter, so that the exhaust purified by the diesel particulate filter is directly discharged into the atmosphere;
The organic working medium inlet is sequentially connected with the working medium pump, the organic working medium liquid storage tank, the condenser and the expander through the organic working medium pipeline and then communicated with the organic working medium outlet so as to realize the circulating flow of the organic working medium in the organic Rankine cycle system;
The expander is coaxially connected with the generator so as to realize conversion from mechanical energy to electric energy; the frequency converter is connected with the working medium pump through an electric lead; the control unit is connected with the frequency converter, the first temperature sensor, the mass flow sensor, the first pressure sensor, the second pressure sensor and the second temperature sensor through electric wires to control the operation of the control unit, the first temperature sensor, the mass flow sensor and the first pressure sensor are arranged between the oxidation catalytic converter and the diesel engine particle catcher, and the second pressure sensor and the second temperature sensor are arranged at the second exhaust pipeline.
2. A method for regulating a system for regulating regeneration of a diesel particulate filter according to claim 1, wherein: when the diesel engine starts to run, the first temperature sensor and the mass flow sensor respectively measure exhaust temperature signals and mass flow signals flowing out of the oxidation catalytic converter and transmit the exhaust temperature signals and the mass flow signals to the control unit, and the control unit judges and outputs corresponding instructions according to the exhaust temperature:
When the exhaust temperature of the oxidation catalytic converter is higher than the regeneration temperature T rec of the diesel particulate filter, the diesel particulate filter has regeneration conditions, and the organic Rankine cycle system is mainly used for temperature control; then, whether the organic Rankine cycle system is started or not is further judged, the control unit respectively collects signals of the first pressure sensor and the second pressure sensor, and differential pressure is calculated and judged according to the following formula:
ΔP＝P1-P2
Wherein DeltaP is the pressure difference of the exhaust gas of the diesel engine before and after passing through the diesel particulate filter, and MPa; p 1 is the pressure of the diesel exhaust gas flowing into the diesel particulate filter, and MPa; p 2 is the pressure at which the diesel exhaust exits the diesel particulate filter, MPa.
3. A method for regulating a system for regulating regeneration of a diesel particulate filter according to claim 2, wherein: when the control unit controls the working medium pump to work and the pressure difference delta P is larger than the diesel engine exhaust pressure difference P measured under the minimum carbon layer thickness corresponding to the maximum purification rate of the diesel engine particle catcher, the diesel engine particle catcher needs to be regenerated and the organic Rankine cycle system is not started;
When the diesel engine exhaust flows into the diesel engine particle catcher from the first exhaust pipeline, the exhaust entering the diesel engine particle catcher is not cooled because the organic Rankine cycle system is not operated, and then the regeneration reaction of the diesel engine particle catcher is spontaneously carried out.
4. A method for regulating a system for regulating regeneration of a diesel particulate filter according to claim 2, wherein: when the control unit does not spray oil or the exhaust back pressure is smaller than the diesel engine exhaust pressure difference P measured under the minimum carbon layer thickness corresponding to the maximum purification rate of the diesel engine particle catcher, the diesel engine particle catcher does not need to be regenerated, and the organic Rankine cycle system is started to regulate and control the exhaust temperature and recover the exhaust energy;
When the diesel engine exhaust flows into the diesel engine particle catcher from the first exhaust pipeline, the organic Rankine cycle system operates, the diesel engine exhaust entering the diesel engine particle catcher exchanges heat with the organic working medium through the evaporator fins and the wall surface of the diesel engine particle catcher to cool, and then is discharged through the second exhaust pipeline, so that the regeneration reaction of the diesel engine particle catcher does not occur.
5. A method for regulating a system for regulating regeneration of a diesel particulate filter according to claim 2, wherein: when the exhaust gas of the diesel engine enters the diesel engine particle catcher to exchange heat with the organic working medium, the control unit calculates an outlet exhaust gas temperature target value of the diesel engine particle catcher according to the following formula;
Tout(exh)＝T90(scr)
Wherein T out(exh) is an exhaust outlet temperature target value K of the diesel particulate filter; t 90(scr) is the light-off temperature, K, of a selective catalytic reduction system arranged behind the diesel particulate filter, and the numerical value is obtained by looking up a table;
Then the exhaust heat release quantity of the diesel engine is calculated according to the following formula;
wherein, the specific constant pressure heat capacity of the exhaust gas of the diesel engine of c p(exh) is obtained by table lookup of the numerical value, kJ/(kg.K); The mass flow of the exhaust gas of the diesel engine is measured by a mass flow sensor, and kg/s; t in(exh) is the temperature of the exhaust gas of the diesel engine before entering the diesel particulate filter, and is measured by a first temperature sensor, K; t out(exh) is the target value of the outlet exhaust temperature of the diesel particulate filter, K;
The convective heat exchange temperature difference between the organic working medium and the exhaust of the diesel engine and the heat absorption capacity of the organic working medium are respectively calculated by the following formulas;
wherein DeltaT is the temperature difference of convection heat exchange between the organic working medium and the exhaust gas of the diesel engine, K; heat release is carried out on exhaust gas of the diesel engine, and kW is carried out; k is the heat exchange coefficient of the evaporator, and kW/(m 2. K) is obtained by looking up a table; a is the heat exchange area of the evaporator, namely the sum of the surface area of the evaporator fin and the area of the outer wall of the diesel particulate filter, m 2;
in the method, in the process of the invention, Absorbing heat for organic working medium, kW; /(I)Heat release is carried out on exhaust gas of the diesel engine, and kW is carried out; η evap is the heat exchange efficiency of the evaporator, and the numerical value is obtained from the data of the evaporator;
and then the temperature of the organic working medium after heat exchange of the evaporator is calculated by the following formula:
Wherein T out(ref) is the temperature of the organic working medium after heat exchange by the evaporator, and K; delta T is the temperature difference of convection heat exchange between the organic working medium and the exhaust gas of the diesel engine, K; t in(ref) is the temperature before the organic working medium enters the evaporator, and the value is 300K;
finally, calculating a mass flow target value of the organic working medium according to the following formula, and outputting and adjusting a rotating speed signal of the working medium pump by the control unit through the frequency converter so that the mass flow of the organic working medium reaches the target value;
in the method, in the process of the invention, Is the mass flow of the organic working medium, kg/s; c p(ref) is the specific constant pressure heat capacity of the organic working medium, and is obtained by looking up a table, kJ/(kg.K); t in(ref) is the temperature before the organic working medium enters the evaporator, and the value is 300K; t out(ref) is the temperature of the organic working medium after heat exchange by the evaporator, K;
Then, the second temperature sensor measures the actual value of the exhaust temperature of the outlet of the diesel particulate filter and transmits the actual value to the control unit, and the control unit further adjusts the rotating speed of the working medium pump according to the target value of the exhaust temperature of the outlet of the diesel particulate filter, so as to adjust the actual value of the exhaust temperature, and the actual value of the outlet exhaust temperature of the diesel particulate filter approaches to the target value; the organic working medium and the exhaust gas of the diesel engine exchange heat and then enter an expansion machine to expand and do work to generate electricity and output to the outside, exhaust steam after doing work then flows to a condenser, is condensed into liquid state by the condenser and flows back to an organic working medium liquid storage tank to carry out the next cycle.
6. A method for regulating a system for regulating regeneration of a diesel particulate filter according to claim 2, wherein: when the exhaust temperature of the diesel engine is smaller than the regeneration temperature of the diesel engine particle catcher, the diesel engine particle catcher does not have the regeneration condition, and the organic Rankine cycle system is directly started and used for recovering the exhaust energy;
When the exhaust gas of the diesel engine flows into the diesel engine particle catcher through the first exhaust pipeline, the exhaust gas exchanges heat with the organic working medium in the diesel engine particle catcher through the wall surface and the evaporator fins, and is then discharged through the second exhaust pipeline, and the regeneration reaction of the diesel engine particle catcher does not occur;
When the diesel engine exhaust enters the diesel engine particle catcher for heat exchange, the control unit sets the target value of the outlet exhaust temperature of the diesel engine particle catcher as the exhaust acid dew point temperature 423K; then the exhaust heat release quantity of the diesel engine is calculated by the following formula;
Wherein c p(exh) is the specific constant pressure heat capacity of the exhaust gas of the diesel engine, and the value is obtained by looking up a table, kJ/(kg.K); The mass flow of the exhaust gas of the diesel engine is measured by a mass flow sensor, and kg/s; t in(exh) is the temperature of the exhaust gas of the diesel engine before entering the diesel particulate filter, and is measured by a first temperature sensor, K; t out(exh) is a target temperature value of the diesel engine exhaust after heat exchange by an evaporator, and the value is 423K of the acid dew point temperature of the exhaust;
The convective heat transfer temperature difference between the organic working medium and the exhaust of the diesel engine and the organic working medium heat absorption capacity are respectively calculated by the following two formulas;
Wherein DeltaT is the temperature difference of convection heat exchange between the organic working medium and the exhaust gas of the diesel engine, K; k is the heat exchange coefficient of the evaporator, and kW/(m 2. K) is obtained by looking up a table; a is the heat exchange area of the evaporator, namely the sum of the surface area of the evaporator fin and the area of the outer wall of the diesel particulate filter, m 2;
in the method, in the process of the invention, Absorbing heat for organic working medium, kW; /(I)Heat release is carried out on exhaust gas of the diesel engine, and kW is carried out; η evap is the heat exchange efficiency of the evaporator, obtained from the evaporator data;
and then the temperature of the organic working medium after heat exchange of the evaporator is calculated by the following formula:
Wherein T out(ref) is the temperature of the organic working medium after heat exchange by the evaporator, and K; delta T is the temperature difference of convection heat exchange between the organic working medium and the exhaust gas of the diesel engine, K; t in(ref) is the temperature before the organic working medium enters the evaporator, and the value is 300K;
finally, calculating a mass flow target value of the organic working medium according to the following formula, and outputting and adjusting a rotating speed signal of the working medium pump by the control unit through the frequency converter so that the mass flow of the organic working medium reaches the target value;
in the method, in the process of the invention, Is the mass flow of the organic working medium, kg/s; c p(ref) is the specific constant pressure heat capacity of the organic working medium, and is obtained by looking up a table, kJ/(kg.K); t in(ref) is the temperature before the organic working medium enters the evaporator, and the value is 300K; t out(ref) is the temperature of the organic working medium after heat exchange by the evaporator, K;
And then the second temperature sensor measures the actual value of the exhaust temperature of the outlet of the diesel particulate filter and transmits the actual value to the control unit, the control unit further adjusts the rotating speed of the working medium pump by taking the value of the exhaust acid dew point temperature of the diesel engine as a target value, and further adjusts the actual value of the exhaust temperature so as to realize that the actual value of the outlet temperature of the diesel particulate filter approaches to the target value, the organic working medium exchanges heat with the diesel engine exhaust and then enters an expansion machine to expand and do work to generate electricity to be output outwards, exhaust steam after doing work then flows to a condenser, and flows back to the organic working medium liquid storage tank after being condensed into liquid state by the condenser for next cycle.
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| CN106523077A (en) * | 2016-12-29 | 2017-03-22 | 杭州恒浦环保科技有限公司 | Diesel engine exhaust after-treatment regeneration device |
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