CN114837782A - Emission reduction device of fixed source diesel engine and control method thereof - Google Patents

Emission reduction device of fixed source diesel engine and control method thereof Download PDF

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Publication number
CN114837782A
CN114837782A CN202210646418.4A CN202210646418A CN114837782A CN 114837782 A CN114837782 A CN 114837782A CN 202210646418 A CN202210646418 A CN 202210646418A CN 114837782 A CN114837782 A CN 114837782A
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China
Prior art keywords
pressure difference
diesel engine
difference value
bypass valve
particle catcher
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CN202210646418.4A
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CN114837782B (en
Inventor
陈鹏
曾伟
邵祥
杨密龙
张�浩
黄松
朱磊
刘德文
臧志成
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Kailong High Technology Co Ltd
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Kailong High 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • 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
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0422—Methods of control or diagnosing measuring the elapsed time
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1406—Exhaust gas pressure
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The embodiment of the invention discloses an emission reduction device of a fixed source diesel engine and a control method thereof. The emission reduction device of the fixed source diesel engine comprises: the particle trap is connected with the diesel engine through a first exhaust pipe; the pressure difference detection module is arranged at two ends of the particle catcher and used for detecting and acquiring the pressure difference value of the particle catcher; the electric bypass valve is connected with the diesel engine through a first exhaust pipe and communicated with the atmosphere through a second exhaust pipe; the control module is at least electrically connected with the pressure difference detection module and the electric bypass valve; the control module is configured to: acquiring a pressure difference value of the particle catcher; and when the pressure difference value of the particle catcher is larger than or equal to a first preset pressure difference value, controlling the electric bypass valve to be opened. Therefore, emission reduction of the whole working condition of the fixed source diesel engine can be realized. Compared with the prior art, the emission reduction device has the advantages of simple structure, small volume, convenient installation, easy operation, no need of setting complicated structures such as water supply and sewage discharge, and the like.

Description

Emission reduction device of fixed source diesel engine and control method thereof
Technical Field
The embodiment of the invention relates to the technical field of diesel engine tail gas aftertreatment, in particular to an emission reduction device of a fixed source diesel engine and a control method thereof.
Background
The exhaust emissions of diesel engines with fixed sources, such as diesel generators, diesel engine test benches, and the like, need to meet the comprehensive emission standard of atmospheric pollutants. The existing emission reduction mode mainly uses purification auxiliary devices such as injection, spraying and the like to reduce the emission of tail gas particles. However, the purification auxiliary devices such as injection and spraying devices are complex to install, occupy large space, require water supply conditions on site, and are complex in structure, multiple in limiting conditions and inconvenient to use.
Disclosure of Invention
The invention provides an emission reduction device of a fixed source diesel engine and a control method thereof, aiming at realizing emission reduction of all working conditions of the fixed source diesel engine, and the device has the advantages of simple structure, small volume, convenience in installation and easiness in operation.
In a first aspect, an embodiment of the present invention provides an emission reduction device for a fixed-source diesel engine, where the emission reduction device for a fixed-source diesel engine includes:
the particle catcher is connected with the diesel engine through a first exhaust pipe;
the pressure difference detection module is arranged at two ends of the particle catcher and used for detecting and acquiring the pressure difference value of the particle catcher;
the electric bypass valve is connected with the diesel engine through the first exhaust pipe and communicated with the atmosphere through a second exhaust pipe;
a control module electrically connected with at least the differential pressure detection module and the electric bypass valve;
the control module is configured to:
acquiring a pressure difference value of the particle catcher;
and when the pressure difference value of the particle catcher is larger than or equal to a first preset pressure difference value, controlling the electric bypass valve to be opened.
Optionally, the first preset differential pressure value is an allowable exhaust differential pressure value of the diesel engine.
Optionally, the control module is configured to: when the pressure difference value of the particle catcher is greater than or equal to a first preset pressure difference value,
recording as a first time length when the error judgment prevention is carried out;
and controlling the electric bypass valve to be opened when the first time length is greater than or equal to a first preset time length.
Optionally, the control module is further configured to:
acquiring a pressure difference value of the particle catcher when the diesel engine is started in an idling mode;
when the pressure difference value of the particle catcher is larger than or equal to a second preset pressure difference value, timing a first smoke working condition, and recording as a second time length; and when the second time length is greater than or equal to a second preset time length, controlling the electric bypass valve to be opened.
Optionally, the second preset differential pressure value is a differential pressure limit value at the beginning of the first smoke condition of the diesel engine.
Optionally, the control module is further configured to:
and after the diesel engine is stopped, controlling the electric bypass valve to be closed when the pressure difference value of the particulate trap is smaller than the second preset pressure difference value.
Optionally, the emission reduction device of the fixed source diesel engine further comprises an alarm module electrically connected with the control module;
the control module is further configured to:
and when the pressure difference value of the particle catcher is greater than or equal to the first preset pressure difference value, sending an alarm signal to the alarm module.
Optionally, the emission reduction device of the fixed-source diesel engine further comprises a control cabinet, and the control module and the alarm module are arranged in the control cabinet; the control cabinet is also provided with a display screen, a key switch, a mode selection switch and a door lock.
In a second aspect, an embodiment of the present invention further provides a control method for an emission reduction device of a fixed-source diesel engine, where the control method is executed by the emission reduction device of the fixed-source diesel engine, and the device includes: the particle catcher is connected with the diesel engine through a first exhaust pipe; the pressure difference detection module is arranged at two ends of the particle catcher and used for detecting and acquiring the pressure difference value of the particle catcher; the electric bypass valve is connected with the diesel engine through the first exhaust pipe and communicated with the atmosphere through a second exhaust pipe; a control module electrically connected with at least the differential pressure detection module and the electric bypass valve;
the control method comprises the following steps:
acquiring a pressure difference value of the particle catcher;
and when the pressure difference value of the particle catcher is larger than or equal to a first preset pressure difference value, controlling the electric bypass valve to be opened.
Optionally, the control method of the emission reduction device of the fixed-source diesel engine further includes:
acquiring a pressure difference value of the particle catcher when the diesel engine is started in an idling mode;
when the pressure difference value of the particle catcher is larger than or equal to a second preset pressure difference value, timing a first smoke working condition, and recording as a second time length; and when the second time length is greater than or equal to a second preset time length, controlling the electric bypass valve to be opened.
The invention provides an emission reduction device of a fixed source diesel engine and a control method thereof, and the emission reduction device of the fixed source diesel engine comprises: the particle trap is connected with the diesel engine through a first exhaust pipe; the pressure difference detection module is arranged at two ends of the particle catcher and used for detecting and acquiring the pressure difference value of the particle catcher; the electric bypass valve is connected with the diesel engine through a first exhaust pipe and communicated with the atmosphere through a second exhaust pipe; the control module is at least electrically connected with the pressure difference detection module and the electric bypass valve; the control module is configured to: acquiring a pressure difference value of the particle catcher; and when the pressure difference value of the particle catcher is larger than or equal to a first preset pressure difference value, controlling the electric bypass valve to be opened. Thus, the following steps are carried out: the pressure difference value of the particle trap is detected in real time, so that the particle trap reduces emission of the fixed source diesel engine on the premise that the pressure difference value meets a first preset pressure difference value, and when the pressure difference value of the particle trap does not meet the first preset pressure difference value, the electric bypass valve is opened, so that the diesel engine emission is discharged through the electric bypass valve, carbon cleaning maintenance is conducted on the particle trap by workers conveniently, and emission reduction of the whole working condition of the fixed source diesel engine is achieved. Compared with the prior art, the emission reduction device has the advantages of simple structure, small volume, convenient installation, easy operation, no need of setting complicated structures such as water supply and sewage discharge, and the like.
Drawings
FIG. 1 is a schematic structural diagram of an emission abatement device for a fixed source diesel engine provided in an embodiment of the present invention;
FIG. 2 is a block diagram of a circuit configuration of an emission reduction device of a fixed source diesel engine provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control cabinet provided in an embodiment of the present invention;
FIG. 4 is a functional block diagram of an emission abatement device for a fixed source diesel engine provided in an embodiment of the present invention;
FIG. 5 is a flow chart of a method of controlling an emission abatement device for a fixed source diesel engine provided in an embodiment of the present invention;
FIG. 6 is a flow chart of a method of controlling an emission abatement device for a fixed source diesel engine provided in an embodiment of the present invention;
FIG. 7 is a flow chart of another method of controlling an emission abatement device for a fixed source diesel engine provided in an embodiment of the present invention;
fig. 8 is a flowchart of a control method of an emission reduction device of a fixed-source diesel engine provided in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of an emission reduction device of a fixed-source diesel engine provided in an embodiment of the present invention, and fig. 2 is a block diagram of a circuit structure of the emission reduction device of the fixed-source diesel engine provided in the embodiment of the present invention.
Referring to fig. 1 and 2, the emission reduction apparatus of a fixed-source diesel engine includes:
the particle catcher 1 is connected with a diesel engine 3 through a first exhaust pipe 2;
the pressure difference detection module 4 is arranged at two ends of the particle catcher 1 and is used for detecting and acquiring the pressure difference value of the particle catcher 1;
an electric bypass valve 5 connected to the diesel engine 3 through a first exhaust pipe 2 and communicating with the atmosphere through a second exhaust pipe 6;
the control module 7 is at least electrically connected with the differential pressure detection module 4 and the electric bypass valve 5;
the control module 7 is configured to:
acquiring a differential pressure value of the particle catcher 1;
when the pressure difference value of the particle catcher 1 is greater than or equal to a first preset pressure difference value, the electric bypass valve 5 is controlled to open.
The stationary source diesel engine is a diesel engine whose position is not changed, and corresponds to a mobile source, for example, a diesel engine car is a mobile source. Wherein, the one end of particle catcher 1 is connected with the diesel engine through first exhaust pipe 2, and the other end crosses filter equipment and communicates with atmosphere through inside, and from this, diesel engine 3, first exhaust pipe 2 and particle catcher 1 form first discharge path.
Among them, a Particulate Filter (DPF) 1 is used for filtering and trapping Particulate matter in exhaust gas discharged from a stationary source Diesel engine 3. Wherein, particulate trap 1 filters diesel engine 3's tail gas under the prerequisite that satisfies first predetermined differential pressure value, but when particulate trap 1's differential pressure value is greater than or equal to first predetermined differential pressure value, it is more to explain the accumulative tail gas particulate matter in the particulate trap, amalgamates whole particulate trap even, if not in time clear up, then pile up the normal exhaust that the DPF of particulate matter can block up the diesel engine, influences its normal operating, therefore, needs in time to clear up.
Here, the electric bypass valve 5 may be connected to the first exhaust pipe 2 and the second exhaust pipe 6 through a bypass pipe 8 shown in fig. 1, respectively, so that the electric bypass valve 5 communicates with the diesel engine 3 and the atmosphere, respectively. And a second exhaust passage formed by the diesel engine 3, the first exhaust pipe 2, the bypass valve 8, the electric bypass valve 5, and the second exhaust pipe 6 may be formed in a state where the electric bypass valve 5 is opened. Wherein when the electric bypass valve 5 is in a closed state, the second exhaust passage is open, and exhaust gas of the diesel engine is exhausted through the first exhaust passage; when the electric bypass valve 5 is in the open state, the second exhaust passage is open, and the first exhaust passage is open (at which time the differential pressure value of the particulate trap does not satisfy the first preset differential pressure value), the exhaust gas of the diesel engine is exhausted through the second exhaust passage.
The pressure difference detection module 4 is used for detecting and obtaining the pressure difference value at two ends of the particle catcher 1 in real time and sending the pressure difference value to the control module 7. The control module 7 is disposed in the control cabinet 9 shown in fig. 1, the differential pressure detection module 7 may be electrically connected to the control module 7 through a first harness L1 shown in fig. 1, and the electric bypass valve 5 may be electrically connected to the control module 7 through a second harness L2 shown in fig. 1.
The differential pressure detection module 4 may be a pressure sensor. The control module 7 may be a PLC controller.
The first preset differential pressure value is an exhaust differential pressure value of the particulate trap allowed by the diesel engine and is a limiting value for opening the electric bypass valve. The specific value can be set according to actual conditions, and is not specifically limited herein.
It should be noted that, in order to ensure effective emission reduction when the diesel engine starts to start, for example, emission reduction through a particulate trap, the following may be set: the electric bypass valve will switch to the closed state each time the device is powered up, regardless of the previous state.
In the technical scheme of this embodiment, the implementation process of the emission reduction device of the fixed source diesel engine is as follows: referring to fig. 1 and 2, prior to the start-up of the fuel engine 3, the electrically operated bypass valve 5 is in a closed state and the interior of the particulate trap 1 is relatively clean and free of accumulated particulates. After the diesel engine 3 is started, the electric bypass valve 5 is in a closed state, so that a second exhaust passage formed by the diesel engine 3, the first exhaust pipe 2, the bypass valve 8, the electric bypass valve 5 and the second exhaust pipe 6 is disconnected, and the inside of the particle trap 1 is relatively clean, so that the first exhaust passage is connected, namely, the exhaust gas exhausted by the diesel engine 3 enters the particle trap 1 through the first exhaust pipe 2, and the particulate matters in the exhaust gas are filtered and trapped by the particle trap 1 and then exhausted, so that the exhaust gas of the diesel engine 3 is reduced, and the exhaust gas exhausted from the particle trap 1 meets the comprehensive emission standard of atmospheric pollutants. In the process, the pressure difference detection module 4 detects in real time to obtain the pressure difference value of the particle trap 1 and sends the pressure difference value to the control module 7, the control module 7 obtains the real-time pressure difference value of the particle trap 1 and compares the real-time pressure difference value with a first preset pressure difference value, when the pressure difference value of the particle trap 1 is larger than or equal to the first preset pressure difference value, it is indicated that more exhaust particles are accumulated in the particle trap 1, even the whole particle trap is full, if the cleaning is not performed in time, the DPF full of the particles can block the normal exhaust of the diesel engine, and the normal operation of the diesel engine cannot be reduced and is also affected. Therefore, at this time, the control module 7 controls the electric bypass valve 5 to be opened, the electric bypass valve 5 is opened to conduct the second exhaust passage, and the exhaust gas output by the diesel engine 3 is discharged through the second exhaust passage, so that the normal exhaust of the diesel engine is not influenced. At the same time, the person concerned can take the particle trap off for carbon cleaning maintenance work, and at this stage the control module 7 keeps the electric bypass valve 5 open. This makes it possible to: the tail gas of the diesel engine with the fixed source is reduced in the period when the differential pressure value of the particle trap meets the first preset differential pressure value, and when the differential pressure value of the particle trap does not meet the first preset differential pressure value, the tail gas of the diesel engine is discharged through the electric bypass valve by controlling the electric bypass valve to be opened, so that carbon cleaning maintenance can be carried out on the particle trap, and normal exhaust of the diesel engine is not affected. Compared with the prior art, the emission reduction device has the advantages of simple structure, small volume, convenient installation, easy operation, no need of setting complicated structures such as water supply and sewage discharge, and the like.
According to the technical scheme of the embodiment, the emission reduction device of the fixed source diesel engine comprises: the particle trap is connected with the diesel engine through a first exhaust pipe; the pressure difference detection module is arranged at two ends of the particle catcher and used for detecting and acquiring the pressure difference value of the particle catcher; the electric bypass valve is connected with the diesel engine through a first exhaust pipe and communicated with the atmosphere through a second exhaust pipe; the control module is at least electrically connected with the pressure difference detection module and the electric bypass valve; the control module is configured to: acquiring a pressure difference value of the particle catcher; and when the pressure difference value of the particle catcher is larger than or equal to a first preset pressure difference value, controlling the electric bypass valve to be opened. Thus, it can be seen that: the pressure difference value of the particle trap is detected in real time, so that the particle trap reduces emission of the fixed source diesel engine on the premise that the pressure difference value meets a first preset pressure difference value, and when the pressure difference value of the particle trap does not meet the first preset pressure difference value, the electric bypass valve is opened, so that the diesel engine emission is discharged through the electric bypass valve, carbon cleaning maintenance is carried out on the particle trap by workers, and emission reduction of the whole working condition of the fixed source diesel engine is achieved. Compared with the prior art, the emission reduction device has the advantages of simple structure, small volume, convenient installation, easy operation, no need of setting complicated structures such as water supply and sewage discharge, and the like.
On the basis of the above technical solution, optionally, the first preset differential pressure value is an exhaust differential pressure value of the particulate trap allowed by the diesel engine.
Wherein the first preset differential pressure value is a limit value for opening the electric bypass valve 5, and when the differential pressure value of the particulate trap 1 is greater than or equal to the opening limit value, it is indicated that the electric bypass valve 5 can be controlled to open. The setting of the first preset differential pressure value can be input according to original information of the diesel engine to obtain the DPF exhaust differential pressure value allowed by the diesel engine, and the specific numerical value can be set according to the actual situation without specific limitation.
Optionally, the control module is configured to:
when the pressure difference value of the particle catcher is greater than or equal to the first preset pressure difference value,
recording as a first time length when the error judgment prevention is carried out;
and controlling the electric bypass valve to be opened when the first time length is greater than or equal to a first preset time length.
The first preset time length is a time length allowed by program misjudgment prevention, and the specific value can be set according to actual conditions, and is not specifically limited herein.
Specifically, before the oil engine 3 is started, the electric bypass valve 5 is in a closed state, and the inside of the particulate trap 1 is relatively clean and does not accumulate particles. After the diesel engine 3 is started, the electric bypass valve 5 is in a closed state, so that the second exhaust passage is disconnected, and the first exhaust passage is connected, namely, the exhaust gas discharged by the diesel engine 3 enters the particle trap 1 through the first exhaust pipe 2, and the particulate matters in the exhaust gas are filtered and trapped by the particle trap 1 and then discharged, so that the exhaust gas of the diesel engine 3 is reduced, and the exhaust gas discharged from the particle trap meets the comprehensive emission standard of atmospheric pollutants. In the process, the pressure difference detection module 4 detects in real time to obtain a pressure difference value of the particle trap 1 and sends the pressure difference value to the control module 7, the control module 7 obtains the real-time pressure difference value of the particle trap 1 and compares the real-time pressure difference value with a first preset pressure difference value, and when the pressure difference value of the particle trap 1 is greater than or equal to the first preset pressure difference value, the situation that more exhaust particles are accumulated in the particle trap 1 and carbon cleaning maintenance is needed is indicated; in order to prevent the program misjudgment, the misjudgment prevention time is needed and is recorded as a first time length t 1; and controls the electric bypass valve 5 to open when the first period t1 is greater than or equal to the first preset period t. The electric bypass valve 5 is opened to conduct the second exhaust passage, and the exhaust gas output by the diesel engine 3 is discharged through the second exhaust passage, so that the normal exhaust of the diesel engine is not affected. At the same time, the person concerned can take the particle trap off for carbon cleaning maintenance work, and at this stage the control module 7 keeps the electric bypass valve 5 open.
However, due to differences in the age and body emission levels of the stationary source diesel engines in use, users have different requirements as to when to activate particulate matter reduction devices while the engine is running. For example, particulate matter emission of most newly-added diesel generators, diesel engines for vehicles, non-road agricultural machines and engineering machinery test benches and the like can meet the requirements of the comprehensive emission standard of atmospheric pollutants when the engines normally run, but the particulate matter emission exceeds the standard when the engines are started at idle speed to load loads (first smoke working condition). Therefore, the relevant user only requires particulate matter emissions during idle start-up to initial loading, and no emission reduction is required after the engine has been operated stably. In order to meet the special requirements of such users and solve the problem of particulate matter emission of the diesel engine from idle start to load (first smoke condition), the following strategy is proposed.
Optionally, the control module is further configured to:
acquiring a pressure difference value of the particle catcher when the diesel engine is started in an idling mode;
when the pressure difference value of the particle catcher is larger than or equal to a second preset pressure difference value, timing a first smoke working condition, and recording as a second time length; and controlling the electric bypass valve to be opened when the second time length is greater than or equal to a second preset time length.
The first smoke condition refers to a condition that the diesel engine is started from an idle speed to a loaded load. The second preset differential pressure value is a differential pressure limit value when the first smoke working condition of the diesel engine starts.
The second preset duration is the preset duration of the first smoke working condition of the diesel engine, the value of the second preset duration can be determined according to the actual operation characteristics of the diesel engine, and the specific numerical value can be set according to the actual condition without specific limitation.
For example, for a diesel engine which only needs to perform emission reduction under the first smoke working condition, the duration t of storing the first smoke can be preset in the control module 7 according to the operation characteristics of the diesel engine of the type target And a pressure differential limit Δ P at the beginning of the first puff condition x . When the diesel engine is started in an idling mode, the pressure difference detection module 4 detects the pressure difference value of the particle trap 1 in real time and sends the pressure difference value to the control module 7, the control module 7 obtains the pressure difference value of the particle trap 1 and compares the pressure difference value with a second preset pressure difference value, when the pressure difference value of the particle trap is larger than or equal to the second preset pressure difference value, the diesel engine enters a first smoke working condition, and under the first smoke working condition, a large amount of smoke tail gas, such as dense black smoke, is usually discharged by the diesel engine and needs to be reduced through the particle trap; then timing the first smoking working condition and recording as a second time length; and comparing the second duration with a second preset duration, and when the second duration is greater than or equal to the second preset duration, indicating that the first smoke working condition is finished and the first smoke working condition is about to enter a normal operation working condition (tail gas exhausted by certain types of diesel engines under the working condition generally can meet the tail gas emission standard and does not need to use a particle trap for emission reduction), at the moment, the control module 7 controls the electric bypass valve 5 to be opened, so that the tail gas exhausted by the diesel engines is exhausted through the electric bypass valve, and normal exhaust of the diesel engines is further ensured. Therefore, the emission reduction device can meet the special requirements that only emission reduction is carried out under the first smoke working condition and emission reduction is not needed under other operation working conditions, and compared with the prior art, the emission reduction device is simple in structure, small in size, convenient to install, easy to operate and free of arrangement of complicated structures such as water supply and pollution discharge.
In addition, the value of the second preset time can be set, for example, the second preset time is set to be the time required by the whole operation process of the diesel engine, so that the emission reduction requirement of the first smoke working condition can be met, and the emission reduction requirement of the whole working condition can be met, therefore, the method is suitable for users who have requirements on the emission reduction of the first smoke and the emission reduction of the whole working condition.
In summary, the emission reduction device for the fixed source diesel engine provided by the embodiment of the invention can realize that: the application condition of satisfying the all operating mode emission reduction demand of fixed source diesel engine, only to the application condition of the emission reduction demand of "first cigarette" operating mode to and all need the condition that reduces discharging to first cigarette operating mode and all operating modes, can satisfy various difference demands, and compare with prior art, this emission reduction device's simple structure, small, the installation of being convenient for, easily operation to need not to set up complicated water supply blowdown isotructures.
Optionally, the second predetermined pressure differential value is a pressure differential limit at the beginning of the first smoke operating condition of the diesel engine.
Wherein, the obtaining of the second preset differential pressure value may be: when the diesel engine runs at the idle starting, the electric bypass valve (with an automatic opening mode and a manual opening mode) is manually opened, and the pressure difference limit value of starting timing of the working condition of 'first smoke' is obtained by correcting (larger than the deviation of the pressure difference detection module and smaller than the pressure difference of the DPF in the idle state) on the basis of the pressure difference of the DPF.
Optionally, the first preset differential pressure value is greater than or equal to the second preset differential pressure value.
Optionally, the control module is further configured to:
and after the diesel engine is stopped, controlling the electric bypass valve to be closed when the pressure difference value of the particulate trap is smaller than a second preset pressure difference value.
When the diesel engine is shut down and the exhaust gas aftertreatment control system (the control system consisting of the control module, the particulate trap, the pressure difference detection module and the electric bypass valve, which is referred to as the exhaust gas aftertreatment control system for short) is not powered off, the electric bypass valve needs to be closed. Specifically, the control module 7 obtains a pressure difference value of the particulate trap, compares the pressure difference value of the particulate trap with a second preset pressure difference value, and controls the electric bypass valve to be closed when the pressure difference value of the particulate trap is smaller than the second preset pressure difference value, so that when the diesel engine is started next time, the electric bypass valve is always in a closed state, and emission reduction of the diesel engine during starting is not affected.
Optionally, referring to fig. 1 and 2, the emission reduction device for the fixed source diesel engine further comprises an alarm module 10 electrically connected with the control module 7;
the control module is further configured to:
and when the pressure difference value of the particle catcher is greater than or equal to a first preset pressure difference value, sending an alarm signal to an alarm module.
The alarm module 10 may be an audible and visual alarm, and is configured to send audible and visual alarm information when receiving the alarm signal sent by the control module 7, so as to prompt relevant personnel to perform carbon cleaning maintenance operation.
Fig. 3 is a schematic structural diagram of a control cabinet provided in an embodiment of the present invention. Optionally, referring to fig. 1, the emission reduction device of the fixed-source diesel engine further includes a control cabinet 9, the control module 7 and the alarm module 10 are disposed in the control cabinet 9, and the control cabinet 9 is further provided with a power supply access end 11 for accessing an external power supply to supply power to the exhaust gas aftertreatment control system; referring to fig. 3, the control cabinet 91 is further provided with a display screen 92, a key switch 93, a mode selection switch 94 and a door lock 95.
The display screen 92 is electrically connected to the control module 7, and may be configured to display a real-time pressure difference value of the particle trap acquired by the control module 7, and may also display a first preset pressure difference value, a second preset pressure difference value, a first preset time length, a second preset time length, a first time length, a second time length, and the like, so as to facilitate direct checking by related personnel. The key switch 93 is used to open the electric bypass valve in the electric bypass valve manual mode. The mode selection switch 94 is used to select the mode of the electric bypass valve 5, which includes a manual mode and an electric mode. The door lock 95 is an outer door switch of the entire control cabinet 9.
Fig. 4 is a functional structure block diagram of an emission reduction device of a fixed-source diesel engine according to an embodiment of the present invention. For an exemplary function of the emission abatement device for a fixed source diesel engine, reference may be made to fig. 4. A key switch on the cabinet can be controlled to power on a control module and the like, and the electric bypass valve is in a closed state when the electric bypass valve is powered on. The electric bypass valve has a manual mode and an automatic mode, and when the manual mode is needed, the manual mode is directly selected through a mode selection switch on the control cabinet and the electric bypass valve can be manually opened; if the electric mode is selected, the control module directly executes the program in the dotted line frame in fig. 4 to realize the automatic control of the electric bypass valve, and the specific process refers to the implementation process of the emission reduction device of the fixed source diesel engine according to any embodiment of the invention.
The embodiment of the invention also provides a control method of the emission reduction device of the fixed source diesel engine. Fig. 5 is a flowchart of a control method of an emission reduction device of a fixed-source diesel engine provided in an embodiment of the present invention. Referring to fig. 5, the method specifically includes the following steps:
step 110, obtaining a pressure difference value of the particle catcher;
specifically, the emission reduction device of the fixed source diesel engine comprises a particle trap, a pressure difference detection module, an electric bypass valve, a control module and the like. The particle catcher is connected with the diesel engine and is used for filtering and catching particles in the tail gas of the diesel engine; the pressure difference detection module is arranged at two ends of the particle catcher and used for detecting and obtaining the pressure difference value of the particle catcher in real time and sending the pressure difference value to the control module.
And step 120, when the pressure difference value of the particle trap is greater than or equal to a first preset pressure difference value, controlling the electric bypass valve to be opened.
The first preset differential pressure value is an exhaust differential pressure value of the particulate trap allowed by the diesel engine and is a limiting value for opening the electric bypass valve.
Specifically, the control module obtains a real-time pressure difference value of the particulate filter, compares the real-time pressure difference value with a first preset pressure difference value, and when the pressure difference value of the particulate filter is greater than or equal to the first preset pressure difference value, it is indicated that more exhaust particulate matters are accumulated in the particulate filter, or even the whole particulate filter is full of the particulate filter, if the particulate filter is not cleaned in time, the DPF full of the particulate matters blocks normal exhaust of the diesel engine, and not only emission reduction can not be performed, but also normal operation of the diesel engine is affected, therefore, the control module controls the electric bypass valve to be opened at the moment, and the electric bypass valve is opened to discharge the exhaust output by the diesel engine 3 through the electric bypass valve, so that normal exhaust of the diesel engine is ensured.
In the technical scheme of this embodiment, by providing a method for controlling an emission reduction device of a fixed-source diesel engine, the method for controlling an emission reduction device of a fixed-source diesel engine includes: acquiring a pressure difference value of the particle catcher; and when the pressure difference value of the particle catcher is larger than or equal to a first preset pressure difference value, controlling the electric bypass valve to be opened. Thus, it can be seen that: the pressure difference value of the particle trap is detected in real time, so that the particle trap reduces emission of the fixed source diesel engine on the premise that the pressure difference value meets a first preset pressure difference value, and when the pressure difference value of the particle trap does not meet the first preset pressure difference value, the electric bypass valve is opened, so that the diesel engine emission is discharged through the electric bypass valve, carbon cleaning maintenance is carried out on the particle trap by workers, and emission reduction of the whole working condition of the fixed source diesel engine is achieved. Compared with the prior art, the emission reduction device has the advantages of simple structure, small volume, convenient installation, easy operation, no need of setting complicated structures such as water supply and sewage discharge, and the like.
As an implementation manner, fig. 6 is a flowchart of a control method of an emission reduction device of a fixed-source diesel engine provided in an embodiment of the present invention. Optionally, referring to fig. 6, the method specifically includes the following steps:
and step 210, setting a first preset differential pressure value, namely obtaining a DPF exhaust differential pressure value allowed by the diesel engine according to the original information input of the diesel engine, and setting an electric bypass valve opening limit value delta P.
And step 220, acquiring a pressure difference value delta Px of the particle trap.
And step 230, comparing whether the pressure difference value delta Px of the particle trap is larger than or equal to the opening limit value delta P of the electric bypass valve.
And step 240, when the electric bypass valve opening limit value is met, carrying out false judgment prevention, wherein the first time period is t 1.
Step 250, comparing whether the first time period t1 is greater than or equal to the first preset time period t.
And step 260, when the t1 is larger than or equal to t, the electric bypass valve is opened, sound and light alarm is carried out, carbon cleaning maintenance is reminded, and the bypass valve is kept in an open state.
As an implementation manner, fig. 7 is a flowchart of a control method of an emission reduction device of a fixed-source diesel engine provided in an embodiment of the present invention. Optionally, referring to fig. 7, the method specifically includes the following steps:
step 310, setting a second presetDuration, i.e. duration t of the first smoke condition determined according to the actual operating characteristics of the diesel engine target 。
And step 320, acquiring a pressure difference value delta Px of the particle catcher when the diesel engine is started in an idling mode.
Step 330, the diesel engine runs under the idle working condition, the bypass valve is manually opened, and the correction is carried out on the basis of the pressure difference of the DPF to obtain the pressure difference limit value delta P for starting timing under the first smoke working condition 0 。
Step 340, the pressure difference value Δ Px at the particle trap is greater than or equal to a second predetermined pressure difference value Δ P 0 Then, the timing of the first smoke condition is started, i.e., the second time period t 2.
Step 350, comparing whether the second time duration t2 is greater than or equal to the second preset time duration t target 。
Step 360, when the second duration t2 is greater than or equal to the second preset duration t target When the valve is opened, the electric bypass valve is opened and the bypass valve is kept in an open state.
As an implementation manner, fig. 8 is a flowchart of a control method of an emission reduction device of a fixed-source diesel engine provided in an embodiment of the present invention. Optionally, referring to fig. 8, the method specifically includes the following steps:
step 410, setting a second preset time period, namely determining the duration t of the first smoke working condition according to the actual operation characteristics of the diesel engine target 。
And step 420, acquiring a pressure difference value delta Px of the particle catcher when the diesel engine is started in an idling mode.
Step 430, the diesel engine runs under the idle working condition, the bypass valve is manually opened, and correction is carried out on the basis of the pressure difference of the DPF to obtain the pressure difference limiting value delta P for starting timing under the first smoke working condition 0 。
Step 440, the pressure difference value Δ Px at the particle trap is greater than or equal to a second predetermined pressure difference value Δ P 0 Then, the timing of the first smoke condition is started, i.e., the second time period t 2.
Step 450, comparing whether the second time period t2 is greater than or equal to the second preset time period t target 。
Step 460, when the second duration t2 is greater than or equal to the second preset duration t target When the valve is opened, the electric bypass valve is opened and the bypass valve is kept in an open state.
Step 470, after the diesel engine is stopped, when the pressure difference value Δ Px of the particulate trap is smaller than a second preset pressure difference value Δ P 0 When the electric bypass valve is closed, the error-prevention judgment is started, and the time is recorded as a third time length t 3.
Step 480, comparing whether the third time duration t3 is greater than or equal to the first preset time duration t.
And step 490, controlling the electric bypass valve to close and keeping the closed state of the bypass valve when the third time period t3 is greater than or equal to the first preset time period.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. An emission reduction device for a fixed source diesel engine, comprising:
the particle catcher is connected with the diesel engine through a first exhaust pipe;
the pressure difference detection module is arranged at two ends of the particle catcher and used for detecting and acquiring the pressure difference value of the particle catcher;
the electric bypass valve is connected with the diesel engine through the first exhaust pipe and communicated with the atmosphere through a second exhaust pipe;
a control module electrically connected with at least the differential pressure detection module and the electric bypass valve;
the control module is configured to:
acquiring a pressure difference value of the particle catcher;
and when the pressure difference value of the particle catcher is larger than or equal to a first preset pressure difference value, controlling the electric bypass valve to be opened.
2. An emission abatement device for a fixed source diesel engine as claimed in claim 1, wherein the first predetermined pressure differential value is an allowed exhaust pressure differential value for the diesel engine.
3. The fixed-source diesel emission abatement apparatus of claim 1, wherein the control module is configured to:
when the pressure difference value of the particle catcher is greater than or equal to a first preset pressure difference value,
recording as a first time length when the error judgment prevention is carried out;
and controlling the electric bypass valve to be opened when the first time length is greater than or equal to a first preset time length.
4. The fixed-source diesel emission abatement apparatus of claim 1, wherein the control module is further configured to:
acquiring a pressure difference value of the particle catcher when the diesel engine is started in an idling mode;
when the pressure difference value of the particle catcher is larger than or equal to a second preset pressure difference value, timing a first smoke working condition, and recording as a second time length; and when the second time length is greater than or equal to a second preset time length, controlling the electric bypass valve to be opened.
5. An emissions reduction device for a fixed source diesel engine as claimed in claim 4 wherein the second predetermined pressure differential value is a pressure differential limit at the start of the first smoke condition of the diesel engine.
6. The fixed-source diesel emission abatement apparatus of claim 4, wherein the control module is further configured to:
and after the diesel engine is stopped, controlling the electric bypass valve to be closed when the pressure difference value of the particulate trap is smaller than the second preset pressure difference value.
7. The emission reduction device for the fixed-source diesel engine according to claim 1, further comprising an alarm module electrically connected to the control module;
the control module is further configured to:
and when the pressure difference value of the particle catcher is greater than or equal to the first preset pressure difference value, sending an alarm signal to the alarm module.
8. The emission reduction device for the fixed-source diesel engine according to claim 7, further comprising a control cabinet, wherein the control module and the alarm module are disposed in the control cabinet; the control cabinet is also provided with a display screen, a key switch, a mode selection switch and a door lock.
9. A method of controlling an emission abatement device for a fixed source diesel engine, performed by an emission abatement device for a fixed source diesel engine, the device comprising: the particle catcher is connected with the diesel engine through a first exhaust pipe; the pressure difference detection module is arranged at two ends of the particle catcher and used for detecting and acquiring the pressure difference value of the particle catcher; the electric bypass valve is connected with the diesel engine through the first exhaust pipe and communicated with the atmosphere through a second exhaust pipe; a control module electrically connected with at least the differential pressure detection module and the electric bypass valve;
the control method comprises the following steps:
acquiring a pressure difference value of the particle catcher;
and when the pressure difference value of the particle catcher is larger than or equal to a first preset pressure difference value, controlling the electric bypass valve to be opened.
10. The method of controlling an emission reduction device for a fixed-source diesel engine according to claim 9, further comprising:
acquiring a pressure difference value of the particle catcher when the diesel engine is started in an idling mode;
when the pressure difference value of the particle catcher is larger than or equal to a second preset pressure difference value, timing a first smoke working condition, and recording as a second time length; and when the second time length is greater than or equal to a second preset time length, controlling the electric bypass valve to be opened.
CN202210646418.4A 2022-06-08 2022-06-08 Emission reduction device of fixed source diesel engine and control method thereof Active CN114837782B (en)

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