CN115306519B - Diesel locomotive tail gas aftertreatment system and control method - Google Patents

Diesel locomotive tail gas aftertreatment system and control method Download PDF

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Publication number
CN115306519B
CN115306519B CN202211143977.XA CN202211143977A CN115306519B CN 115306519 B CN115306519 B CN 115306519B CN 202211143977 A CN202211143977 A CN 202211143977A CN 115306519 B CN115306519 B CN 115306519B
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urea
control unit
preset
sensor
pressure
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CN115306519A (en
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丁作鹏
段同磊
韩见民
李斐
刘洪萍
李博
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CRRC Dalian Institute Co Ltd
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CRRC Dalian Institute 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
    • F01N3/2066—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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • 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
    • F01N3/08—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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
    • 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
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/08—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for heavy duty applications, e.g. trucks, buses, tractors, locomotives
    • 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
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F01N2610/144—Control thereof
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • 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
    • F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
    • 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
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1602—Temperature of exhaust gas 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
    • 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
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1614—NOx amount trapped in catalyst
    • 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
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1808—Pressure
    • 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
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1814—Tank level
    • 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
    • Y02T10/40—Engine management systems

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

Abstract

The invention discloses a diesel locomotive tail gas aftertreatment system and a control method, wherein the diesel locomotive tail gas aftertreatment system comprises a tail gas treatment device, a urea box, a control unit and a rotating speed sensor, the tail gas treatment device comprises a bypass valve, the bypass valve is sequentially connected with a first nitrogen oxide sensor, a temperature sensor, a pressure difference sensor, a tail gas treatment reaction tank, an air pressure sensor and a second nitrogen oxide sensor, the nitrogen oxide concentration before and after waste gas treatment is measured through the first nitrogen oxide sensor and the second nitrogen oxide sensor, the waste gas denitration rate is obtained through the control unit, the urea box is provided with a liquid level sensor and a urea pump, the urea pump is connected with the urea nozzle through a pipeline, and the control unit is respectively connected with the rotating speed sensor and the urea box. The problems that the tail gas aftertreatment system cannot effectively remove the content of solid particles in the tail gas and cannot effectively control the spraying content of urea solution, and meanwhile, the existing tail gas aftertreatment system is low in safety and inconvenient to maintain are solved.

Description

Diesel locomotive tail gas aftertreatment system and control method
Technical Field
The invention relates to the field of tail gas aftertreatment systems and devices of diesel locomotives, in particular to a tail gas aftertreatment system and a control method of a diesel locomotive.
Background
The system and the device for post-treating the tail gas of the diesel locomotive are brand new fields of domestic tail gas treatment of locomotives. At present, some foreign manufacturers design SCR denitration reaction devices of rail locomotives, but the SCR denitration reaction devices are not suitable for domestic internal combustion engine rail locomotives because the technology is blocked and the applicable vehicle types are completely different. Most of the domestic existing SCR catalytic reaction devices are used in automobiles and ships, the volume of the automobile SCR catalytic reaction device is small, and the marine SCR catalytic reaction device is too large to be applied to rail locomotives.
At present, an exhaust aftertreatment system and an exhaust aftertreatment device of an internal combustion locomotive are designed aiming at the internal combustion locomotive, however, the internal combustion locomotive has insufficient fuel combustion, so that exhaust pollution air is caused. The diesel locomotive can generate a large amount of pollutants, in particular Particulate Matters (PM) and nitrogen oxides (NOx), in the running process, with the continuous upgrading of emission regulations, the emission limit values of the particulate matters and the nitrogen oxides are more and more severe, and how to remove dust and denitrate, improve the safety of a system and the convenience of maintenance is a technical problem which needs to be solved by a person skilled in the technical field.
Disclosure of Invention
The invention provides a diesel locomotive exhaust gas aftertreatment system and a control method, which are used for solving the problems that the exhaust gas aftertreatment system cannot effectively remove the content of solid particles in exhaust gas and cannot effectively control the injection content of urea solution, and meanwhile, the existing exhaust gas treatment system is low in safety and inconvenient to maintain.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the tail gas post-treatment system of the diesel locomotive comprises a tail gas treatment device, a urea box, a control unit and a rotating speed sensor;
The tail gas treatment device comprises a bypass valve, wherein the bypass valve is sequentially connected with a gas flowmeter, a first oxynitride sensor, a temperature sensor, a pressure difference sensor, a tail gas treatment reaction tank, an air pressure sensor and a second oxynitride sensor, a first pressure reducing valve is arranged between the pressure difference sensor and the tail gas treatment reaction tank, the first oxynitride sensor is used for measuring the concentration of oxynitride in the waste gas when the waste gas is not treated, and the second oxynitride sensor is used for measuring the concentration of oxynitride in the treated waste gas; the control unit is used for acquiring the denitration rate of the waste gas;
The urea box is provided with a liquid level sensor and a urea pump, the urea pump is connected with a urea spray head, a pressure sensor for measuring pipeline pressure is arranged between the urea pump and the urea spray head, a reversing valve is arranged between the urea pump and the pressure sensor, the pressure sensor and the urea spray head are provided with a second pressure reducing valve, and the control unit is respectively connected with the rotating speed sensor and the urea box and is used for measuring the rotating speed of the internal combustion engine.
Further, a filter screen is arranged at the bottom of the tail gas treatment reaction tank, a plurality of electromagnetic valves for controlling the opening and closing of the soot blowing nozzles are symmetrically arranged on a pipeline above the filter screen, and a urea spray head for spraying urea is arranged between the filter screen and the electromagnetic valves.
Furthermore, the control unit is also provided with a fault storage unit, an alarm system, a display screen and an indicator lamp.
A control method of an exhaust aftertreatment system of an internal combustion locomotive comprises the following steps:
step S1: the tail gas aftertreatment system is electrified and waits, the control unit acquires a switch input signal to judge the system running state, the system running state comprises a running mode and a maintenance mode, and if the system running state is the maintenance mode, the step S2 is executed; if the system running state is the running mode, executing the step S3;
step S2: if the running state of the system is a maintenance mode, the control unit controls the bypass valve to be opened, and the system is in a standby state;
Step S3: if the system running state is the running mode, the control unit controls the bypass valve to be closed and obtains the rotating speed value of the internal combustion engine, and if the rotating speed value of the internal combustion engine is smaller than the preset rotating speed value, the system is still in a standby state; if the rotating speed value of the internal combustion engine is larger than a preset rotating speed value, the system is in an operating state at the moment and executes a soot blowing control strategy;
the control unit acquires temperature data and pressure difference data inside the tail gas aftertreatment device through a thermocouple and a pressure difference sensor respectively, and the urea pump executes a control strategy of urea solution based on the temperature data and the pressure data;
step S4: after the tail gas aftertreatment system is executed, the control unit controls the execution of aftertreatment-improving operation.
Further, in step S3, the soot blowing control strategy specifically includes:
Step S3.1: the control unit is used for acquiring a soot blowing pressure value when the rotating speed value of the internal combustion engine is larger than a preset rotating speed value, the first pressure reducing valve is used for executing pressure reducing operation when the soot blowing pressure is too high, and the control unit is used for controlling the opening of the electromagnetic valve to execute soot blowing operation through the soot blowing nozzle;
Step S3.2: if the soot blowing pressure value is larger than a first preset soot blowing pressure value and smaller than or equal to a second preset soot blowing pressure value, the control unit controls the opening of the electromagnetic valves so as to control the soot blowing nozzles to perform cyclic jet blowing, specifically, the control unit controls the soot blowing nozzles to sequentially spray, and the soot blowing time value of each electromagnetic valve and the interval soot blowing time value of two adjacent electromagnetic valves are preset;
If the soot blowing pressure value is larger than a second preset soot blowing pressure value, determining that the soot blowing pressure is large, alarming, turning on a system fault indicator lamp, and prompting that a first pressure reducing valve fails through a display screen;
if the soot blowing pressure value is smaller than or equal to the first preset soot blowing pressure value, determining that the soot blowing pressure is small, alarming, turning on a system fault indicator lamp, prompting that a first pressure reducing valve breaks down or a soot blowing pipeline leaks through a display screen, and controlling the electromagnetic valve to be closed by the control unit.
Further, the control strategy of the urea solution in step S3 specifically includes:
If the temperature data is smaller than a first preset temperature value, the control unit controls the urea pump not to spray the urea solution;
If the temperature data is larger than a second preset temperature value, the control unit determines that the system is high in temperature and gives an alarm, and the system fault indicator lights are on, the control unit controls the bypass valve to be opened and the bypass valve to be on, and the control unit controls the system to enter a standby state;
When the temperature data is larger than a first preset temperature value and smaller than a second preset temperature value, and if the pressure difference data is smaller than or equal to the preset internal pressure value of the tail gas device, the control unit executes tail gas treatment operation, if the pressure difference data is larger than the preset internal pressure value, the system determines that the pressure is large, alarms and a system fault indicator light is on, the control unit controls the bypass valve to be opened and the bypass valve to be opened, the control unit controls the system to enter a maintenance mode.
Further, the tail gas treatment operation is specifically performed by the system, wherein the liquid level sensor acquires the urea solution content of the urea box and transmits the urea solution content to the control unit;
If the urea solution content is smaller than the preset minimum value of the urea solution content, the urea liquid level indicator lamp is on, and the control unit controls the urea pump to stop urea injection;
If the urea solution content is larger than a preset urea solution content minimum value, acquiring an air pressure value through an air pressure sensor, if the air pressure value is smaller than a first preset air pressure value, determining air pressure, alarming and turning on a fault indicator lamp, prompting a pipeline leakage fault by a display screen, if the air pressure value is larger than a second preset air pressure value, determining that the air pressure is high, alarming and turning on the fault indicator lamp, and prompting a second pressure reducing valve fault by the display screen;
And if the air pressure value is larger than a first preset air pressure value and smaller than a second preset air pressure value, the control unit obtains the required urea solution amount according to the exhaust gas amount obtained by the flowmeter and the concentration of the oxynitride detected by the first oxynitride sensor, and controls the urea pump to spray the urea solution through the control unit.
Further, when the control unit controls the urea pump to spray urea solution, the pressure sensor detects the urea pipeline pressure value of the pipeline in real time, if the urea pipeline pressure value is smaller than a first preset pipeline pressure value, the system determines that the urea pipeline pressure is low, alarms and the fault indicator lamp is on, and the display screen prompts the leakage of the urea pipeline; if the urea pipeline pressure value is larger than a second preset pipeline pressure value, the system determines that the urea pipeline pressure is high, alarms and the fault indicator lamp is on, the display screen prompts the second pressure reducing valve to be faulty, and if the urea pipeline pressure value is larger than the first preset pipeline pressure value and smaller than the second preset pipeline pressure value, the control unit controls the urea pump to spray urea solution.
Further, when the exhaust gas treatment system stops running, the control unit controls the reversing valve to be opened, the urea pump executes the liquid suction operation to suck the urea pipeline solution back to the urea tank, and the residual liquid crystals of the urea pipeline are prevented from blocking the pipeline.
The invention has the beneficial effects that:
The invention provides a diesel locomotive tail gas aftertreatment system and a control method, wherein a plurality of soot blowing nozzles are arranged, the soot blowing nozzles are controlled by a control unit to perform interval soot blowing operation, solid particles contained in tail gas during exhaust are effectively reduced, nitrogen oxide sensors are respectively arranged on pipelines at two ends of a tail gas treatment tank, the content of nitrogen oxide in the tail gas is effectively removed by detecting the content of the nitrogen oxide in the tail gas before and after treatment and adjusting the injection quantity of urea solution, meanwhile, the control unit monitors the temperature and the pressure in the system and the urea solution in a urea box in real time, alarms through an alarm system and a fault indicator lamp, and the system is maintained by opening and closing a bypass valve, so that the convenience of system maintenance is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of an exhaust aftertreatment system for an internal combustion locomotive in accordance with the present invention;
FIG. 2 is a top view of an exhaust treatment reaction tank of an exhaust aftertreatment system for an internal combustion locomotive in accordance with the present invention;
FIG. 3 is a flow chart of a method for controlling an exhaust aftertreatment system for an internal combustion locomotive in accordance with the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides a diesel locomotive tail gas aftertreatment system, as shown in fig. 1, including tail gas treatment device, urea case, control unit and rotational speed sensor, control unit is equipped with power supply board, communication board, DI board, DO board, CPU board, AI board, AO board, FI board, K even board and constitutes, and the power supply board is mainly responsible for converting diesel locomotive DC110V power into DC24V, digital 5V or 3.3V, analog quantity + -5V, and the communication board has one way 485 communication, four way CAN communication, one way ethernet communication. The DI board card is eight-path passive DI, the DO board card is forty-eight-path passive DO, the CPU board card main control chip is STM32F4 series processor, the main functions are system program operation place, temporary data storage and the like, the AI board card is twelve-path 4-20mA collection, the AO board card is two-path 4-20mA output, the FI board card is two-path, and the locomotive rotating speed is mainly collected. The K even board card is used for four-way temperature acquisition.
The diesel locomotive tail gas aftertreatment system further comprises a power supply module, the power supply module comprises a first power supply and a second power supply, the first power supply converts a locomotive DC110V power supply into DC24V and supplies power for the control unit, the bypass valve and the electromagnetic valve, and the second power supply converts the locomotive DC110V power supply into AC220V to supply power for the urea pump.
The tail gas treatment device comprises a bypass valve, wherein the bypass valve is sequentially connected with a gas flowmeter, a first oxynitride sensor, a temperature sensor, a pressure difference sensor, a tail gas treatment reaction tank, an air pressure sensor and a second oxynitride sensor, a first pressure reducing valve is arranged between the pressure difference sensor and the tail gas treatment reaction tank, the first oxynitride sensor is used for measuring the concentration of oxynitride in the waste gas when the waste gas is not treated, and the second oxynitride sensor is used for measuring the concentration of oxynitride in the treated waste gas; and the control unit is used for acquiring the denitration rate of the waste gas, and the temperature sensor is mainly used for acquiring the ambient temperature and the internal temperature of the tail gas treatment device. The nitrogen oxide sensors respectively detect and collect the concentration of nitrogen oxides at the front end and the rear end of the tail gas treatment device, and the concentration is transmitted to the controller for treatment through CAN communication. The pressure difference sensor is mainly used for detecting the pressure of the urea pipeline, the pressure of the electromagnetic valve pipeline and the internal pressure of the tail gas treatment device. The bypass valve is used as a front end part of the tail gas treatment device and has the main function of controlling the flow direction of the tail gas, when the tail gas treatment device is in an operating state, the bypass valve is closed, the tail gas flows through the treatment device, and when the tail gas treatment device fails or does not operate, the bypass valve is opened, and the tail gas flows through an original pipeline. The control process is that the power supply supplies DC24V, DO controls the switch of the bypass valve, and the switch state feeds back DO signals to the indication lamp of the control unit for prompting.
The urea box is provided with a liquid level sensor and a urea pump, and the pump body of the urea pump is provided with a control conversion system, so that the urea injection quantity can be regulated by regulating the injection proportion of the urea pump. The urea pump is connected with the urea spray head through a pipeline, a pressure sensor for measuring pipeline pressure is arranged between the urea pump and the urea spray head, a reversing valve is arranged between the urea pump and the pressure sensor, the pressure sensor and the urea spray head are provided with second pressure reducing valves, the control unit is respectively connected with the rotating speed sensor and the urea box, and the rotating speed sensor is used for measuring the rotating speed of the internal combustion engine.
In a specific embodiment, as shown in fig. 2, a filter screen 2 is arranged at the bottom of the tail gas treatment reaction tank, a plurality of electromagnetic valves 1 for controlling the opening and closing of the soot blowing nozzles are symmetrically arranged on a pipeline above the filter screen 2, a pressure reducing valve is arranged on a pipeline connected with the electromagnetic valves 1 and the soot blowing nozzles, and a urea spray head for spraying urea is arranged between the filter screen 2 and the electromagnetic valves 1.
In a specific embodiment, the control unit is further provided with a fault storage unit, an alarm system, a display screen and an indicator lamp. The display screen is in 485 communication with the control unit, and records and displays the current running condition of the locomotive post-processing device. The main functions are as follows: the system comprises a sensor running state lamp display, a tail gas treatment device front end and rear end nitrogen oxide concentration numerical value display, a tail gas treatment device temperature numerical value display, a tail gas treatment device front end and rear end pressure numerical value display, a denitration rate, fault storage and the like, wherein the fault storage unit is used for storing fault information that a control system has overlarge or overlarge urea pipeline pressure or overlarge small urea pipeline pressure, an electromagnetic valve soot blowing pressure is overlarge or overlarge small, the internal temperature of the tail gas treatment device is high, the internal pressure of the tail gas treatment device is high, and the liquid level of a urea tank is low, so that the system is convenient for later maintenance. The indicating lamp comprises an operation indicating lamp, a bypass valve on/off state indicating lamp and a fault indicating lamp, wherein the tail gas treatment device is in an operation state when the operation indicating lamp is green, and the tail gas treatment system is in a fault state when the operation indicating lamp is red. When the bypass valve indicator light is green, the bypass valve is closed, and when the bypass valve is red, the bypass valve is opened, and the exhaust gas treatment system is stopped. The control unit also comprises a control knob, and the control knob controls the power-on, power-off and scram operation of the system.
A control method of an exhaust aftertreatment system of an internal combustion locomotive, as shown in fig. 3, comprises the following steps:
step S1: the tail gas aftertreatment system is electrified and waits, the control unit acquires a switch input signal to judge the system running state, the system running state comprises a running mode and a maintenance mode, and if the system running state is the maintenance mode, the step S2 is executed; if the system running state is the running mode, executing the step S3;
step S2: if the running state of the system is a maintenance mode, the control unit controls the bypass valve to be opened, and the system is in a standby state;
Step S3: if the system running state is an running mode, the control unit controls the bypass valve to be closed and obtains the rotating speed value of the internal combustion engine, and if the rotating speed value of the internal combustion engine is smaller than a preset rotating speed value, the preset rotating speed value is 200r/min, the system is still in a standby state; if the rotating speed value of the internal combustion engine is larger than a preset rotating speed value, the system is in an operating state at the moment and executes a soot blowing control strategy;
the control unit acquires temperature data and pressure difference data inside the tail gas aftertreatment device through a thermocouple and a pressure difference sensor respectively, and the urea pump executes a control strategy of urea solution based on the temperature data and the pressure data;
step S4: after the tail gas aftertreatment system is executed, the control unit controls the execution of aftertreatment-improving operation.
In a specific embodiment, the soot blowing control strategy in step S3 is specifically:
Step S3.1: when the rotating speed value of the internal combustion engine is larger than a preset rotating speed value, a first pressure reducing valve is arranged on a soot blowing pipeline between the electromagnetic valve 1 and the soot blowing nozzle, the pressure sensor is used for acquiring a soot blowing pressure value, the first pressure reducing valve is used for executing pressure reducing operation when the soot blowing pressure is too high, and the control unit controls the opening of the electromagnetic valve 1 to execute soot blowing operation through the soot blowing nozzle;
Step S3.2: if the soot blowing pressure value is greater than a first preset soot blowing pressure value, the first preset soot blowing pressure value is 0.4Mpa and is smaller than or equal to a second preset soot blowing pressure value, and the second preset soot blowing pressure value is 0.8Mpa, the control unit controls the opening of the electromagnetic valve 1 so as to control the soot blowing nozzle to perform cyclic jet blowing, and the cyclic jet blowing specifically comprises that the control unit controls the soot blowing nozzle to sequentially perform spraying, and presets the soot blowing time value of each electromagnetic valve 1 and the interval soot blowing time value of two adjacent electromagnetic valves 1;
If the soot blowing pressure value is larger than a second preset soot blowing pressure value, determining that the soot blowing pressure is large, alarming, turning on a system fault indicator lamp, and prompting that a first pressure reducing valve fails through a display screen;
If the soot blowing pressure value is smaller than or equal to the first preset soot blowing pressure value, determining that the soot blowing pressure is small, alarming, turning on a system fault indicator lamp, prompting that a first pressure reducing valve breaks down or a soot blowing pipeline leaks through a display screen, and controlling the electromagnetic valve 1 to be closed by the control unit.
In a specific embodiment, the control strategy of the urea solution in step S3 is specifically:
If the temperature data is smaller than a first preset temperature value, wherein the first preset temperature value is 300 ℃, the control unit controls the urea pump not to spray urea solution;
If the temperature data is larger than a second preset temperature value, the second preset temperature value is 550 ℃, the control unit prompts a system to alarm at high temperature, the control unit controls the bypass valve to be opened and the bypass valve opening indicator lamp to be on, and the control unit controls the system to enter a standby state;
When the temperature data is larger than a first preset temperature value and smaller than a second preset temperature value, and if the pressure difference data is smaller than or equal to the preset internal pressure value of the tail gas device, the internal pressure value of the preset tail gas device is 4KPa, the control unit executes tail gas treatment operation, if the pressure difference data is larger than the preset internal pressure value, the system confirms that the pressure is large, alarms and the system fault indicator lights are on, the control unit controls the bypass valve to be opened and the bypass valve to be opened, and the control unit controls the system to enter a maintenance mode.
In a specific embodiment, the system performs an exhaust gas treatment operation, specifically, the liquid level sensor acquires the urea solution content of the urea tank and transmits the urea solution content to the control unit;
if the urea solution content is smaller than the preset minimum value of the urea solution content, a urea liquid level low indicator lamp is on, and the control unit controls the urea pump to stop urea injection;
If the urea solution content is larger than a preset urea solution content minimum value which is 10% of the capacity of the urea tank, acquiring an air pressure value through an air pressure sensor, if the air pressure value is smaller than a first preset air pressure value which is 0.1MPa, determining that the air pressure is low and alarming and a fault indication lamp is on by a system, prompting a pipeline leakage fault by a display screen, and if the air pressure value is larger than a second preset air pressure value which is 0.5MPa, determining that the air pressure is high and alarming and the fault indication lamp is on by the system, and prompting a second pressure reducing valve to be faulty by the display screen;
And if the air pressure value is larger than a first preset air pressure value and smaller than a second preset air pressure value, the control unit obtains the required urea solution amount according to the exhaust gas amount obtained by the flowmeter and the concentration of the oxynitride detected by the first oxynitride sensor, and controls the urea pump to spray the urea solution through the control unit.
In a specific embodiment, when the control unit controls the urea pump to spray urea solution, the pressure sensor detects the urea pipeline pressure value of the pipeline in real time, if the urea pipeline pressure value is smaller than a first preset pipeline pressure value, the first preset pipeline pressure value is 0.1MPa, the system determines that the urea pipeline pressure is low, alarms and the fault indicator lights are on, and the display screen prompts the leakage of the urea pipeline. If the urea pipeline pressure value is larger than a second preset pipeline pressure value, the second preset pipeline pressure value is 0.6MPa, the system determines that the urea pipeline pressure is high, alarms and a fault indicator lamp is on, the display screen prompts the fault of the second pressure reducing valve, and if the urea pipeline pressure value is larger than the first preset pipeline pressure value and smaller than the second preset pipeline pressure value, the control unit controls the urea pump to spray urea solution.
In a specific embodiment, the post-treatment operation is that when the exhaust gas treatment system stops running, the control unit controls the reversing valve to be opened, the urea pump executes a liquid suction operation to suck the urea pipeline solution back to the urea tank, and the residual liquid crystals in the urea pipeline are prevented from blocking the pipeline. After the urea pipeline is processed, the tail gas processing system reads the states of all the sensors, and if the system is in a fault mode, the system waits for maintenance personnel to process and eliminate faults and then continues to run. If the rotating speed is lower than 200r/min, the system judges that the locomotive is in a stop state, and the system automatically enters a power-on initial state.
The system and the control method can overcome the defects of the tail gas treatment system of the existing diesel locomotive, calculate the content of the urea solution according to the prior art through the value of the oxynitride collected by the oxynitride sensor and spray through the urea pump, greatly reduce the emission of nitrogen oxides in tail gas and waste gas, and the denitration rate reaches about seventy percent, so that the treatment effect of the tail gas of the locomotive is improved, and the tail gas of the locomotive reaches the emission standard. In addition, the device has the following characteristics: the system has the functions of complete autonomous closed-loop control, visual display of the running state of the system, one-key switching of the running state, fault storage and the like, and only a small amount of manual intervention is needed in the later maintenance, so that the maintenance cost is low.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (4)

1. A control method of an exhaust aftertreatment system for an internal combustion locomotive, comprising:
step S1: the tail gas aftertreatment system is electrified and waits, the control unit acquires a switch input signal to judge the system running state, the system running state comprises a running mode and a maintenance mode, and if the system running state is the maintenance mode, the step S2 is executed; if the system running state is the running mode, executing the step S3;
the diesel locomotive tail gas aftertreatment system comprises a tail gas treatment device, a urea box, a control unit and a rotating speed sensor;
The tail gas treatment device comprises a bypass valve, wherein the bypass valve is sequentially connected with a gas flowmeter, a first oxynitride sensor, a temperature sensor, a pressure difference sensor, a tail gas treatment reaction tank, an air pressure sensor and a second oxynitride sensor, a first pressure reducing valve is arranged between the pressure difference sensor and the tail gas treatment reaction tank, the first oxynitride sensor is used for measuring the oxynitride concentration in the waste gas when the waste gas is untreated, the second oxynitride sensor is used for measuring the oxynitride concentration in the treated waste gas, and the control unit is used for obtaining the denitration rate of the waste gas;
The urea box is provided with a liquid level sensor and a urea pump, the urea pump is connected with a urea spray head, a pressure sensor for measuring pipeline pressure is arranged between the urea pump and the urea spray head, a reversing valve is arranged between the urea pump and the pressure sensor, the pressure sensor and the urea spray head are provided with a second pressure reducing valve, and the control unit is respectively connected with the rotating speed sensor and the urea box, and the rotating speed sensor is used for measuring the rotating speed of the internal combustion engine;
The bottom of the tail gas treatment reaction tank is provided with a filter screen (2), a plurality of electromagnetic valves (1) for controlling the opening and closing of the soot blowing nozzles are symmetrically arranged on a pipeline above the filter screen (2), and the urea spray head for spraying urea is arranged between the filter screen (2) and the electromagnetic valves (1);
The control unit is also provided with a fault storage unit, an alarm system, a display screen and an indicator lamp;
step S2: if the running state of the system is a maintenance mode, the control unit controls the bypass valve to be opened, and the system is in a standby state;
Step S3: if the system running state is the running mode, the control unit controls the bypass valve to be closed and obtains the rotating speed value of the internal combustion engine, and if the rotating speed value of the internal combustion engine is smaller than the preset rotating speed value, the system is still in a standby state; if the rotating speed value of the internal combustion engine is larger than a preset rotating speed value, the system is in an operating state at the moment and executes a soot blowing control strategy; the soot blowing control strategy specifically comprises the following steps:
Step S3.1: the control unit is used for acquiring a soot blowing pressure value when the rotating speed value of the internal combustion engine is larger than a preset rotating speed value, the first pressure reducing valve is used for executing pressure reducing operation when the soot blowing pressure is too high, and the control unit is used for controlling the opening of the electromagnetic valve (1) to execute soot blowing operation through a soot blowing nozzle;
Step S3.2: if the soot blowing pressure value is larger than a first preset soot blowing pressure value and smaller than and equal to a second preset soot blowing pressure value, the control unit controls the opening of the electromagnetic valves (1) so as to control the soot blowing nozzles to perform cyclic jet blowing, specifically, the control unit controls the soot blowing nozzles to sequentially perform spraying, and the soot blowing time value of each electromagnetic valve (1) and the interval soot blowing time value of two adjacent electromagnetic valves (1) are preset;
If the soot blowing pressure value is larger than a second preset soot blowing pressure value, determining that the soot blowing pressure is large, alarming, turning on a system fault indicator lamp, and prompting that a first pressure reducing valve fails through a display screen;
if the soot blowing pressure value is smaller than or equal to a first preset soot blowing pressure value, determining that the soot blowing pressure is small, alarming, turning on a system fault indicator lamp, prompting that a first pressure reducing valve breaks down or a soot blowing pipeline leaks through a display screen, and controlling an electromagnetic valve (1) to be closed by the control unit;
the control unit acquires temperature data and pressure difference data inside the tail gas aftertreatment device through a thermocouple and a pressure difference sensor respectively, and the urea pump executes a control strategy of urea solution based on the temperature data and the pressure data; the control strategy of the urea solution specifically comprises the following steps:
If the temperature data is smaller than a first preset temperature value, the control unit controls the urea pump not to spray the urea solution;
If the temperature data is larger than a second preset temperature value, the control unit determines that the system is high in temperature and gives an alarm, and the system fault indicator lights are on, the control unit controls the bypass valve to be opened and the bypass valve to be on, and the control unit controls the system to enter a standby state;
When the temperature data is larger than a first preset temperature value and smaller than a second preset temperature value, and if the pressure difference data is smaller than or equal to the preset internal pressure value of the tail gas device, the control unit executes tail gas treatment operation, if the pressure difference data is larger than the preset internal pressure value, the system determines that the pressure is large, alarms and a system fault indicator light is on, the control unit controls a bypass valve to be opened and the indicator light is on, and the control unit controls the system to enter a maintenance mode;
step S4: after the tail gas aftertreatment system is executed, the control unit controls the execution of aftertreatment-improving operation.
2. The method for controlling an exhaust gas aftertreatment system of an internal combustion locomotive according to claim 1, wherein the system performs an exhaust gas treatment operation, specifically, the liquid level sensor obtains the urea solution content of the urea tank and transmits the urea solution content to the control unit;
If the urea solution content is smaller than the preset minimum value of the urea solution content, the urea liquid level indicator lamp is on, and the control unit controls the urea pump to stop urea injection;
If the urea solution content is larger than a preset urea solution content minimum value, acquiring an air pressure value through an air pressure sensor, if the air pressure value is smaller than a first preset air pressure value, determining air pressure, alarming and turning on a fault indicator lamp, prompting a pipeline leakage fault by a display screen, if the air pressure value is larger than a second preset air pressure value, determining that the air pressure is high, alarming and turning on the fault indicator lamp, and prompting a second pressure reducing valve fault by the display screen;
And if the air pressure value is larger than a first preset air pressure value and smaller than a second preset air pressure value, the control unit obtains the required urea solution amount according to the exhaust gas amount obtained by the flowmeter and the concentration of the oxynitride detected by the first oxynitride sensor, and controls the urea pump to spray the urea solution through the control unit.
3. The control method of an exhaust aftertreatment system of an internal combustion locomotive according to claim 2, wherein when the control unit controls the urea pump to spray urea solution, the pressure sensor detects the urea pipeline pressure value of the pipeline in real time, if the urea pipeline pressure value is smaller than a first preset pipeline pressure value, the system determines that the urea pipeline pressure is low, alarms and a fault indicator is on, the display screen prompts the urea pipeline to leak, if the urea pipeline pressure value is larger than a second preset pipeline pressure value, the system determines that the urea pipeline pressure is high, alarms and the fault indicator is on, the display screen prompts the second pressure reducing valve to fail, and if the urea pipeline pressure value is larger than the first preset pipeline pressure value and smaller than the second preset pipeline pressure value, the control unit controls the urea pump to spray urea solution.
4. The control method of an exhaust gas aftertreatment system for an internal combustion locomotive according to claim 1 wherein the aftertreatment operation is that when the exhaust gas treatment system is stopped, the control unit controls the reversing valve to open, the urea pump performs a liquid suction operation to suck urea line solution back to the urea tank, and the urea line is prevented from being blocked by residual liquid crystals.
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