CN108979800B - Hydraulic active cooling system applied to urea heating of SCR system and control method thereof - Google Patents

Hydraulic active cooling system applied to urea heating of SCR system and control method thereof Download PDF

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Publication number
CN108979800B
CN108979800B CN201810764217.8A CN201810764217A CN108979800B CN 108979800 B CN108979800 B CN 108979800B CN 201810764217 A CN201810764217 A CN 201810764217A CN 108979800 B CN108979800 B CN 108979800B
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urea
hydraulic
heating
active
heat dissipation
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CN108979800A (en
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阎军
陈远龙
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Hunan Xiangjian Heavy Industry Technology Co ltd
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Hunan Xiangjian Heavy Industry Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The application discloses be applied to hydraulic pressure initiative cooling system of SCR system urea heating, its characterized in that includes: the active heat dissipation device is communicated with a vehicle hydraulic system and is used for acquiring heat of the hydraulic system; the urea tank is communicated with the active heat dissipation device and obtains heat of the active heat dissipation device; and a urea pump for injecting urea in the urea tank. On one hand, the redundant heat of the existing hydraulic system is recycled and used for heating the urea of the SCR system, so that the safe and stable operation of the hydraulic system is guaranteed, the working efficiency of a hydraulic element is improved, no extra energy is consumed, and the method is more scientific and energy-saving; on the other hand, the dependence of the urea of the SCR system on active heating is reduced, the SCR system can be heated without providing extra heat, the energy consumption level of the whole vehicle is optimized, and the cost is saved.

Description

Hydraulic active cooling system applied to urea heating of SCR system and control method thereof
Technical Field
The application relates to the field of engineering vehicle equipment, in particular to a hydraulic active heat dissipation system applied to urea heating of an SCR system and a control method thereof.
Background
SCR, selective catalytic reduction technology, is a treatment process for NOx in tail gas emission of diesel vehicles, i.e. under the action of a catalyst, a reducing agent ammonia or urea is injected to reduce NOx in tail gas into N2 and H2O.
The specific working process is as follows: and tail gas enters an exhaust mixing pipe after coming out of the turbine, a urea metering injection device is arranged on the mixing pipe, urea aqueous solution is injected, urea is hydrolyzed and pyrolyzed at high temperature to generate NH3, NOX is reduced on the surface of a catalyst of the SCR system by NH3 and is discharged out of N2, and redundant NH3 is also reduced into N2 to prevent leakage. Typically, 5L of liquid urea aqueous solution is consumed along with 100L of fuel. Therefore, proper heat is necessary for the catalytic reaction of the SCR aftertreatment urea. In the prior art, an additional heating device is adopted to obtain heat, and energy is additionally consumed.
On the other hand, the hydraulic system in the engineering vehicle is easy to generate overhigh oil temperature due to high-load and high-pressure operation, the viscosity of oil is reduced due to overhigh oil temperature, the lubrication of each element kinematic pair is poor, the aging of a sealing element is accelerated, and the service life of the element is shortened. Engineering equipment is generally bad in working condition, local elements heat seriously, and heat dissipation is particularly important for an engineering equipment hydraulic system. In the prior art, an air cooling or water cooling mode is usually adopted, and energy is additionally consumed.
Disclosure of Invention
In order to solve the technical problems, one of the objectives of the present invention is to provide a hydraulic active heat dissipation system applied to urea heating of an SCR system.
The invention further aims to provide a control method of the hydraulic active heat dissipation system applied to urea heating of the SCR system.
The technical scheme provided by the invention is as follows:
a hydraulic active heat dissipation system applied to urea heating of an SCR system comprises:
the active heat dissipation device is communicated with a hydraulic system of the vehicle and is used for acquiring heat of the hydraulic system;
the urea tank is communicated with the active heat dissipation device and obtains heat of the active heat dissipation device;
and a urea pump for injecting urea in the urea tank.
Preferably, a heater for heating the urea is further included.
Preferably, the active heat dissipation device comprises a valve body, and a snake-shaped urea pipe and a hydraulic pipe which are arranged in the valve body, wherein the hydraulic pipe is communicated with a vehicle hydraulic system, and the snake-shaped urea pipe is communicated with a urea tank.
Preferably, the system further comprises a regulating control valve for regulating the flow of urea into the active heat sink.
Preferably, the system also comprises a urea temperature sensor arranged on the urea tank and a hydraulic oil temperature sensor arranged on the hydraulic system.
Preferably, the cooling device is communicated with a hydraulic system of the vehicle and used for cooling the hydraulic system.
In addition, the invention also provides a control method of the hydraulic active heat dissipation system applied to urea heating of the SCR system, which comprises the following steps:
s1: acquiring a temperature value of a hydraulic oil temperature sensor;
s2: judging whether the temperature value of the hydraulic oil temperature sensor exceeds a preset value or not, and if so, increasing the urea flow passing through the active heat dissipation device;
s3: acquiring a temperature value of a urea temperature sensor;
s4: and judging whether the temperature value of the urea temperature sensor exceeds a preset value or not, and starting the heater if the temperature value does not exceed the preset value.
Preferably, the increase in the urea flow rate through the active heat sink is adjusted by adjusting a control valve.
Preferably, the step S4 further includes the step S41: and if the temperature value of the urea temperature sensor exceeds a preset value, stopping the work of the heater and reducing the urea flow entering the active heat dissipation device.
Preferably, the method further comprises a step S5 of starting the cooling device if the temperature value of the hydraulic oil temperature sensor exceeds a preset value and the temperature value of the urea temperature sensor exceeds a preset value.
The hydraulic active heat dissipation system applied to the urea heating of the SCR system and the control method thereof have the following beneficial effects:
on one hand, the redundant heat of the existing hydraulic system is recycled and used for heating the urea of the SCR system, so that the safe and stable operation of the hydraulic system is guaranteed, the working efficiency of each element in the hydraulic system is improved, no extra energy is consumed, and the method is more scientific and energy-saving; on the other hand, the dependence of the urea of the SCR system on active heating is reduced, the SCR system can be heated without providing extra heat, the energy consumption level of the whole vehicle is optimized, and the cost is saved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of one embodiment of a hydraulic active heat removal system for urea heating in an SCR system;
FIG. 2 is a flowchart of an embodiment of a method for controlling a hydraulic active heat dissipation system for urea heating in an SCR system.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, the technical solution provided by the present embodiment is as follows:
a hydraulic active heat dissipation system applied to urea heating of an SCR system comprises:
the active heat dissipation device 10 is communicated with a hydraulic system 13 of the vehicle and used for acquiring heat of the hydraulic system;
a urea tank 8 which is communicated with the active heat sink 10 and obtains the heat of the active heat sink 10;
and a urea pump 2 for injecting urea in the urea tank 8.
The working principle of the embodiment is as follows:
as shown in fig. 1, the hydraulic system 13 may be a hydraulic system of the own vehicle, each of which utilizes a large amount of heat generated during operation. Piping may be used to conduct heat from the hydraulic system 13 to the active heat sink 10.
The main function of the active heat sink 10 is to obtain heat from the hydraulic system 13 and transmit the heat to the urea in the urea tank 8, and the urea tank 8 can be communicated with the active heat sink 10 through a pipeline and circulate.
The hydraulic system 13 may be connected to the active heat sink 10 through a hydraulic oil pipeline and continuously circulate, so as to continuously transmit heat to the active heat sink 10. The active heat sink 10 may also be communicated with the urea heating return pipe 11 and the urea heating inlet pipe 12, which are communicated with the urea tank 8, to continuously heat the urea in the urea tank 8.
For optimal heating, the urea conduits in the active heat sink 10 may be "S" shaped or serpentine, or "back" shaped, distributed as densely as possible, and spaced as closely as possible from the hydraulic oil conduits to provide adequate heat extraction.
The urea pump 2 is used for pumping out urea in the urea tank 8, and the urea enters the SCR system for chemical reaction.
Through the embodiment, on one hand, redundant heat of the existing hydraulic system is recycled and used for heating the urea of the SCR system, so that the safe and stable operation of the hydraulic system is guaranteed, the working efficiency of each element in the hydraulic system is improved, no extra energy is consumed, and the method is more scientific and energy-saving; on the other hand, the dependence of the urea of the SCR system on active heating is reduced, the SCR system can be heated without providing extra heat, the energy consumption is reduced, the energy consumption level of the whole vehicle is optimized, and the cost is saved.
As a further preferred embodiment, a heater 4 for heating the urea may be further included, so as to prevent the urea from being actively heated or assisted to be heated together when the heat of the hydraulic system 13 is insufficient, thereby ensuring the required temperature of the urea.
The heater 4 may be an electric heater or a heat exchanger connected to the vehicle power unit, and the high-temperature heat of the power unit is transferred to the heat exchanger through a thermal cycle.
Of course, the exhaust gas of the vehicle may be transferred to the heat exchanger by a pipeline in a heat exchange manner with the exhaust gas of the vehicle, so as to heat the heat exchanger, and the heat of the heat exchanger heats the urea entering the urea pump 2.
If the temperature of the urea cannot be further increased by the heat of the vehicle, an electric heating mode can be adopted.
Typically, the heater 4 is provided on the pipe leading into the urea pump 2.
As a further preferred feature of the present embodiment, the active heat sink 10 includes a valve body, and a serpentine urea pipe and a hydraulic pipe which are provided in the valve body, the hydraulic pipe is communicated with a vehicle hydraulic system, and the serpentine urea pipe is communicated with the urea tank 8.
For optimal heating, the urea tubes in the active heat sink 10 may also be "S" or "return" shaped, distributed as densely as possible, and spaced as closely as possible from the hydraulic tubes to provide sufficient heat extraction.
Of course, the hydraulic pipes can also be in a snake shape or an S shape or a return shape, and are distributed as densely as possible, and the hydraulic pipes and the urea pipes form a complicated layout to obtain the best heat exchange effect.
As a further preferred feature of the present embodiment, the present invention further includes a regulation control valve 5 for regulating the flow rate of urea entering the active heat sink 10.
Taking fig. 1 as an example, one of the connection methods is illustrated:
the urea heating return pipe 11 is communicated with the urea tank 8 and the active heat dissipation device 10 and is used for conveying heated urea;
the urea heating inlet pipe 12 is communicated with the regulating control valve 5 and the active heat dissipation device 10 and is used for conveying urea to the active heat dissipation device 10 for heating;
the urea inlet pipe 6 is communicated with the urea tank 8 and the urea pump 2 and is used for ejecting the heated urea;
the urea return pipe 3 is communicated with the urea pump 2 and the regulating control valve 5 and is used for returning urea which flows back from the urea pump 2 to the urea tank 8 or the active heat dissipation device 10;
the urea cold return pipe 7 is communicated with the regulating control valve 5 and the urea tank 8 and used for returning the urea which flows back from the urea pump 2 to the urea tank 8.
The working principle is as follows:
if the urea temperature is detected to be too high or the required temperature is reached, the valve core of the control valve 5 is adjusted to act, the flow of the urea return pipe 3 is conveyed to the urea cold return pipe 7, and the return flow on the urea cold return pipe 7 is increased. If the urea temperature is detected to be too low, namely the urea needs to be heated, at the moment, the flow of the urea return pipe 3 is conveyed to the urea heating inlet pipe 12 by adjusting the control valve 5, namely, the flow of the urea heating inlet pipe 12 is increased, so that most of the urea is conveyed to the active heat dissipation device 10 for heating.
Therefore, the regulation control valve 5 is used for actually achieving the purpose of temperature control, and the temperature of the urea can be conveniently controlled. The regulating control valve 5 may be a proportional regulating valve or other electric regulating valve, or a manual regulating valve.
Further, a urea temperature sensor 9 may be provided in the urea tank 8, and a hydraulic oil temperature sensor 14 may be provided in the hydraulic system 13. Thus, the temperature values can be conveniently detected, and adjustment control can be carried out.
As a further preferable feature of the present embodiment, a cooling device 15 that communicates with the hydraulic system 13 of the vehicle and cools the hydraulic system 13 may be further provided.
If the temperatures of the hydraulic system 13 and the urea are both too high and exceed the preset values, the cooling device 15 can be started to cool, so that the normal operation of the whole SCR system and the hydraulic system is protected. The cooling device 15 may be a fan or other water cooling device.
As shown in fig. 1-2, the present invention further provides a control method of a hydraulic active heat dissipation system for urea heating of an SCR system, comprising the following steps:
s1: acquiring a temperature value of the hydraulic oil temperature sensor 14;
s2: judging whether the temperature value of the hydraulic oil temperature sensor 14 exceeds a preset value or not, and if so, increasing the urea flow passing through the active heat dissipation device 10;
s3: acquiring a temperature value of a urea temperature sensor 9;
s4: and judging whether the temperature value of the urea temperature sensor 9 exceeds a preset value or not, and starting the heater 4 if the temperature value does not exceed the preset value.
The operation principle of the present embodiment will be described with reference to fig. 1 and 2 as an example:
the hydraulic oil temperature sensor 14 is installed on the hydraulic system 13, and the hydraulic system 13 may be a hydraulic system of the vehicle itself, each hydraulic system, because it generates a large amount of heat during operation, and thus the heat is utilized. Piping may be used to conduct heat from the hydraulic system 13 to the active heat sink 10.
The main function of the active heat sink 10 is to obtain heat from the hydraulic system 13 and transmit the heat to the urea in the urea tank 8, and the urea tank 8 can be communicated with the active heat sink 10 through a pipeline and circulate.
The hydraulic system 13 may be connected to the active heat sink 10 through a hydraulic oil pipeline and continuously circulate, so as to continuously transmit heat to the active heat sink 10. The active heat sink 10 may also be communicated with the urea heating return pipe 11 and the urea heating inlet pipe 12, which are communicated with the urea tank 8, to continuously heat the urea in the urea tank 8.
For optimal heating, the urea conduits in the active heat sink 10 may be "S" shaped or serpentine, or "back" shaped, distributed as densely as possible, and spaced as closely as possible from the hydraulic oil conduits to provide adequate heat extraction.
The urea pump 2 is used for pumping out urea in the urea tank 8, and the urea enters the SCR system for chemical reaction.
The control procedure of the present embodiment is explained with reference to fig. 2:
when the temperature value of the hydraulic oil temperature sensor 14 is judged to exceed the preset value, the urea flow passing through the active heat dissipation device 10 is increased, and more heat is taken away by using urea. If the preset value is not exceeded, the value can be kept unchanged.
When the temperature value of the urea temperature sensor 9 is judged not to reach the preset value, the temperature of the urea is not high enough and does not reach the required temperature, the heater 4 is started, and the urea is heated.
Through the embodiment, on one hand, redundant heat of the existing hydraulic system is recycled and used for heating the urea of the SCR system, so that the safe and stable operation of the hydraulic system is guaranteed, the working efficiency of each element in the hydraulic system is improved, no extra energy is consumed, and the method is more scientific and energy-saving; on the other hand, the dependence of the urea of the SCR system on active heating is reduced, the SCR system can be heated without providing extra heat, the energy consumption is reduced, the energy consumption level of the whole vehicle is optimized, and the cost is saved.
As a further preferred feature of the present embodiment, the increase in the flow rate of urea passing through the active heat sink 10 is adjusted by adjusting the control valve 5.
Further, the step S4 further includes the step S41: if the temperature value of the urea temperature sensor 9 exceeds a preset value, the heater 4 stops working, and the urea flow entering the active heat dissipation device 10 is reduced.
As shown in fig. 1, one of the connection modes is illustrated:
the urea heating return pipe 11 is communicated with the urea tank 8 and the active heat dissipation device 10 and is used for conveying heated urea;
the urea heating inlet pipe 12 is communicated with the regulating control valve 5 and the active heat dissipation device 10 and is used for conveying urea to the active heat dissipation device 10 for heating;
the urea inlet pipe 6 is communicated with the urea tank 8 and the urea pump 2 and is used for ejecting the heated urea;
the urea return pipe 3 is communicated with the urea pump 2 and the regulating control valve 5 and is used for returning urea which flows back from the urea pump 2 to the urea tank 8 or the active heat dissipation device 10;
the urea cold return pipe 7 is communicated with the regulating control valve 5 and the urea tank 8 and used for returning the urea which flows back from the urea pump 2 to the urea tank 8.
The working principle is as follows:
if the temperature value of the hydraulic oil temperature sensor 14 is obtained to be too high or the temperature value reaches the required temperature, the valve core of the control valve 5 is adjusted to act, the flow of the urea return pipe 3 is transmitted to the urea cold return pipe 7, and therefore the return flow on the urea cold return pipe 7 is increased. If the urea temperature is detected to be too low, namely the urea needs to be heated, at the moment, the flow of the urea return pipe 3 is conveyed to the urea heating inlet pipe 12 by adjusting the control valve 5, namely, the flow of the urea heating inlet pipe 12 is increased, so that most of the urea is conveyed to the active heat dissipation device 10 for heating.
Therefore, the regulation control valve 5 is used for actually achieving the purpose of temperature control, and the temperature of the urea can be conveniently controlled. The regulating control valve 5 may be a proportional regulating valve or other electric regulating valve, or a manual regulating valve.
Preferably, the method further comprises a step S5 of starting the cooling device 15 if the temperature value of the hydraulic oil temperature sensor 14 exceeds a preset value and the temperature value of the urea temperature sensor 9 exceeds a preset value.
If the temperatures of the hydraulic system 13 and the urea are both too high and exceed the preset values, the cooling device 15 can be started to cool, so that the normal operation of the whole SCR system and the hydraulic system is protected. The cooling device 15 may be a fan or other water cooling device.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. A hydraulic active cooling system applied to urea heating of an SCR system is characterized by comprising:
an active heat sink (10) in communication with a hydraulic system (13) of the vehicle for extracting heat from the hydraulic system;
a urea tank (8) which is communicated with the active heat dissipation device (10) and obtains the heat of the active heat dissipation device (10);
a urea pump (2) for injecting urea in the urea tank (8);
a urea temperature sensor (9) arranged on the urea tank (8) and a hydraulic oil temperature sensor (14) arranged on the hydraulic system (13);
a cooling device (15) communicating with a hydraulic system (13) of the vehicle and adapted to cool said hydraulic system (13).
2. Hydraulic active heat dissipation system for SCR system urea heating according to claim 1, further comprising a heater (4) for heating urea.
3. The hydraulic active heat dissipation system for urea heating of an SCR system according to claim 1 or 2, wherein the active heat dissipation device (10) comprises a valve body and a serpentine urea pipe and a hydraulic pipe which are arranged in the valve body, the hydraulic pipe is communicated with a vehicle hydraulic system, and the serpentine urea pipe is communicated with a urea tank (8).
4. Hydraulic active radiator system for urea heating in SCR systems according to claim 3, further comprising a regulation control valve (5) for regulating the urea flow into the active radiator (10).
5. A control method of a hydraulic active heat dissipation system applied to urea heating of an SCR system is characterized by comprising the following steps:
s1: acquiring a temperature value of a hydraulic oil temperature sensor (14);
s2: judging whether the temperature value of the hydraulic oil temperature sensor (14) exceeds a preset value or not, and if so, increasing the urea flow passing through the active heat dissipation device (10);
s3: acquiring a temperature value of a urea temperature sensor (9);
s4: and judging whether the temperature value of the urea temperature sensor (9) exceeds a preset value or not, and starting the heater (4) if the temperature value does not exceed the preset value.
6. The method for controlling a hydraulic active cooling system for urea heating of an SCR system according to claim 5, wherein the increase of the urea flow through the active cooling device (10) is adjusted by adjusting the control valve (5).
7. The method as claimed in claim 5, wherein the step S4 further includes the step S41: and if the temperature value of the urea temperature sensor (9) exceeds a preset value, stopping the operation of the heater (4) and reducing the urea flow entering the active heat dissipation device (10).
8. The method for controlling the hydraulic active cooling system for SCR system urea heating according to claim 5, further comprising step S5, if the temperature value of the hydraulic oil temperature sensor (14) exceeds a preset value and the temperature value of the urea temperature sensor (9) exceeds a preset value, the cooling device (15) is started.
CN201810764217.8A 2018-07-12 2018-07-12 Hydraulic active cooling system applied to urea heating of SCR system and control method thereof Active CN108979800B (en)

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CN201810764217.8A CN108979800B (en) 2018-07-12 2018-07-12 Hydraulic active cooling system applied to urea heating of SCR system and control method thereof

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Application Number Priority Date Filing Date Title
CN201810764217.8A CN108979800B (en) 2018-07-12 2018-07-12 Hydraulic active cooling system applied to urea heating of SCR system and control method thereof

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CN108979800B true CN108979800B (en) 2020-02-28

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Address after: 415106 Guanxi Town, Dingcheng District, Changde City, Hunan Province

Patentee after: Hunan Xiangjian Heavy Industry Technology Co.,Ltd.

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Denomination of invention: A hydraulic active heat dissipation system and its control method applied to urea heating in SCR systems

Granted publication date: 20200228

Pledgee: Agricultural Bank of China Limited Changde branch

Pledgor: Hunan Xiangjian Heavy Industry Technology Co.,Ltd.

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