CN216617625U - Self-cleaning tail gas purification system for heavy diesel special vehicle - Google Patents
Self-cleaning tail gas purification system for heavy diesel special vehicle Download PDFInfo
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- CN216617625U CN216617625U CN202121959148.XU CN202121959148U CN216617625U CN 216617625 U CN216617625 U CN 216617625U CN 202121959148 U CN202121959148 U CN 202121959148U CN 216617625 U CN216617625 U CN 216617625U
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- 238000000746 purification Methods 0.000 title claims abstract description 44
- 238000004140 cleaning Methods 0.000 title claims abstract description 30
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- 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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- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The utility model relates to a self-cleaning tail gas purification system for a heavy diesel special vehicle, belonging to the technical field of tail gas purification; the self-cleaning tail gas purification system for the heavy diesel special vehicle comprises a DOC + CDPF tail gas purification device, an air passage pipeline, a static adsorption particle catcher and an online monitoring and control system, wherein the air passage pipeline is connected with the static adsorption particle catcher and changes the flow direction of gas entering the DOC + CDPF tail gas purification device along the static adsorption particle catcher; the DOC carrier and the CDPF carrier are heated and insulated by utilizing the heat energy of the tail gas, the heat dissipation of the carrier is reduced, the temperature fluctuation caused by the fluctuation of working conditions is reduced, the time window of regeneration temperature is prolonged, the continuous passive regeneration of the DOC + CDPF system is promoted, the running backpressure of the system is ensured to be kept stable, the problems of difficult regeneration and difficult maintenance when the CDPF is additionally arranged on a heavy diesel special vehicle are solved, the use efficiency of the system is improved, and the requirements and the cost for using and maintaining the system are reduced.
Description
Technical Field
The utility model relates to a self-cleaning tail gas purification system for a heavy diesel special vehicle, and belongs to the technical field of tail gas purification.
Background
The exhaust emission of motor vehicles is an important source of air pollution in China, and according to the annual environmental management of the mobile resource in China in 2019 published by the ministry of ecological environment, NOx and PM emitted by diesel vehicles which only account for 9.1% of the automobile holding amount in China respectively account for 71.2% and more than 99% of the total automobile emission amount. Although the heavy-duty diesel truck only accounts for 3.0% of the automobile holding capacity, the NOx emission amount and the PM emission amount respectively account for 49.3% and 66.3% of the total automobile emission amount. Therefore, controlling NOx and PM emissions from heavy duty diesel vehicles is a major concern in automotive pollution control efforts. In the face of environmental pollution, increasingly stringent emission regulations are continuously driving internal combustion engines to move towards zero emission. Since the national IV standard of diesel vehicles in China is implemented, the post-treatment technology becomes the necessary technology for controlling the tail gas pollution of the diesel vehicles, and the stricter standard requirement in the VI stage of China brings great challenge to the pollutant emission control of the diesel vehicles, so that various post-treatment technologies need to be coupled, and the post-treatment system needs to be fused with an engine system.
Except for a new diesel vehicle, the pollution control of the diesel vehicle in use in China also needs to be developed in a targeted manner, and the method mainly relates to the development of an efficient pollution control technology and an emission online supervision technology of the diesel vehicle in use so as to realize the efficient emission reduction of main pollutants NOx and PM of the diesel vehicle and effectively discriminate the phenomena of system failure, artificial tampering, removal of an after-treatment system and the like and illegal behaviors. In addition, the exhaust emission of the heavy diesel special vehicle has the characteristics of poor original emission and low exhaust temperature, and meanwhile, the heavy diesel special vehicle is mainly operated in the field, has large working condition fluctuation and violent vibration and does not have the condition of frequently maintaining the exhaust aftertreatment device. Therefore, with the stricter emission regulations, the emission reduction technology of heavy diesel vehicles, especially heavy diesel special vehicles, and the critical real-time online intelligent supervision technology become short boards for in-use vehicle emission control and modification, and need to be promoted to be applied in a large scale.
The heavy diesel special vehicle is influenced by severe working conditions and operation conditions, and after the DOC + CDPF passive regeneration tail gas purification device is additionally arranged, the DPF has the problems of easy blockage and difficult regeneration, frequent equipment maintenance is needed, and the process is complicated and high in cost. The exhaust gas purification system adopting the active regeneration scheme has a safety risk due to frequent starting of active regeneration. Meanwhile, due to the operation characteristics of heavy special vehicles, local high temperature and great temperature gradient are easily formed in the active regeneration process, and when the vehicles shake and bump violently, the carriers are easily damaged, so that equipment is damaged. Therefore, when the traditional tail gas purification system is adopted to purify the tail gas of the heavy diesel special vehicle, the problems of low use efficiency, poor stability, easiness in damage, complex maintenance, high cost and the like exist.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems in the background technology, the DOC carrier and the CDPF carrier are heated and insulated by utilizing the heat energy of the tail gas, the heat dissipation of the carrier is reduced, the temperature fluctuation caused by the fluctuation of working conditions is reduced, the time window of regeneration temperature is prolonged, the continuous passive regeneration of the DOC + CDPF system is promoted, the running backpressure of the system is kept stable, the problems of difficult regeneration and difficult maintenance of the CDPF additionally arranged on a heavy diesel special vehicle are solved, the use efficiency, the reliability and the safety of the system are improved, and the requirements and the cost of the use and the maintenance of the system are reduced.
In order to overcome the problems in the background art and solve the problems, the utility model is realized by the following technical scheme:
the self-cleaning tail gas purification system for the heavy diesel special vehicle comprises a DOC + CDPF tail gas purification device, an air passage pipeline, a static adsorption particle catcher and an online monitoring and control system, wherein the DOC + CDPF tail gas purification device is connected with the static adsorption particle catcher through the air passage pipeline, and the air passage pipeline can change the flow direction of gas entering the DOC + CDPF tail gas purification device along the static adsorption particle catcher.
Preferably, DOC + CDPF tail gas cleanup unit includes heat preservation casing, DOC, CDPF, DOC + CDPF subassembly barrel internally mounted has DOC and CDPF, and DOC + CDPF subassembly barrel periphery is provided with carries out the heat preservation casing of parcel to DOC + CDPF subassembly barrel.
Preferably, the heat preservation casing includes outer cone end cover, interior cone end cover, the outer barrel in heating heat preservation chamber, heating heat preservation chamber baffle, the intracavity barrel in heating heat preservation, backward flow water conservancy diversion end cover, interior cone end cover is installed in DOC + CDPF subassembly barrel front side, and outer cone end cover sets up in interior cone end cover front side to wrap up the interior cone end cover, be connected with the heating heat preservation chamber outer barrel that carries out the parcel to DOC + CDPF subassembly barrel side on the outer cone end cover, be connected with the backward flow water conservancy diversion end cover that carries out the parcel to DOC + CDPF subassembly barrel rear side on the heating heat preservation chamber outer barrel, be provided with heating heat preservation chamber baffle between heating heat preservation intracavity barrel and the heating heat preservation chamber outer barrel.
Preferably, the inner wall surface of the backflow guide end cover is a guide curved surface formed on the basis of a hemispherical surface and a semicircular surface, and the guide curved surface is used for guiding airflow in the DOC + CDPF tail gas purification device to reduce back pressure when the airflow flows forwards or backwards, and reducing back pressure fluctuation when the airflow direction is switched by a system.
Preferably, a DOC heat-resistant damping gasket is arranged between the DOC and the DOC + CDPF component cylinder, and a CDPF heat-resistant damping gasket is arranged between the CDPF and the DOC + CDPF component cylinder.
Preferably, be provided with the first graphite packing ring of being convenient for axial rotation between heat preservation casing and the DOC + CDPF subassembly barrel to and second graphite packing ring.
Preferably, the electrostatic adsorption particle catcher comprises an electrostatic adsorption particle catcher shell, an electrostatic adsorption particle catcher negative electrode adsorption end and an electrostatic adsorption particle catcher positive electrode discharge end, wherein the electrostatic adsorption particle catcher shell is internally provided with the electrostatic adsorption particle catcher positive electrode discharge end, and the electrostatic adsorption particle catcher negative electrode adsorption end wrapping the electrostatic adsorption particle catcher positive electrode discharge end is also arranged in the electrostatic adsorption particle catcher shell.
Preferably, the air passage pipeline comprises a first air passage pipeline, a second air passage pipeline, a third air passage pipeline, a fourth air passage pipeline, an air passage pipeline, a DPF assembly, a first electric butterfly valve, a second electric butterfly valve, a third electric butterfly valve and a fourth electric butterfly valve, the second air passage pipeline is arranged on the inner cone end cover, the DPF assembly and the third electric butterfly valve are arranged on the second air passage pipeline, a first air passage pipeline connected with the electrostatic adsorption particle catcher is arranged on the second air passage pipeline between the third electric butterfly valve and the inner cone end cover, the first electric butterfly valve is arranged on the first air passage pipeline, the third air passage pipeline is arranged on the outer cone end cover, the third air passage pipeline is communicated with the fourth air passage pipeline and the air passage pipeline, the fourth air passage pipeline is provided with the fourth electric butterfly valve and is communicated with the second air passage pipeline, the air passage pipeline is connected to the first air passage pipeline between the electrostatic adsorption particle catcher and the first electric butterfly valve, and a second electric butterfly valve is arranged on the gas path pipeline.
Preferably, the online monitoring and control system comprises a first temperature sensor, a first pressure sensor, a vehicle-mounted display terminal, a system control assembly, a fifth pressure sensor, a fifth temperature sensor, a third pressure sensor, a fourth temperature sensor, a third temperature sensor, a second pressure sensor and a fourth pressure sensor, wherein the first temperature sensor and the first pressure sensor are installed at an air inlet of the electrostatic adsorption particle catcher, the fifth temperature sensor and the fifth pressure sensor are installed at an air outlet of a fourth gas path pipeline, the third temperature sensor is installed at the backflow diversion end cover and faces to the center of the CDPF end face, the second temperature sensor is installed on the second gas path pipeline, the fourth temperature sensor is installed at the third gas path pipeline, the second pressure sensor is installed at the air outlet of the electrostatic adsorption particle catcher, the third pressure sensor is installed on a second gas path pipeline between the DPF assembly and the third electric butterfly valve, the fourth pressure sensor is installed on the third gas path pipeline, the first temperature sensor, the first pressure sensor, the fifth temperature sensor, the third pressure sensor, the fourth temperature sensor, the third temperature sensor, the second pressure sensor and the fourth pressure sensor are all connected to the system control assembly, and the system control assembly is further connected with a vehicle-mounted display terminal.
The utility model has the beneficial effects that:
the utility model utilizes the heat energy of the tail gas to heat and insulate the DOC carrier and the CDPF carrier, reduces the heat dissipation of the carrier and reduces the temperature fluctuation caused by the fluctuation of working conditions, thereby prolonging the time window of regeneration temperature, promoting the continuous passive regeneration of the DOC + CDPF system, ensuring the stable running backpressure of the system, meanwhile, the electrostatic adsorption particle catcher is used for adsorbing, storing and gradually releasing the particles in the tail gas, realizing the regeneration regulation and control of the CDPF, avoiding the blockage of the CDPF due to the accumulation of excessive particles at low temperature and the damage due to the violent regeneration of excessive particles at high temperature, the electrostatic adsorption particle catcher and the DOC + CDPF tail gas purification device are mutually assisted and cleaned, leading the system to have the self-cleaning function, avoiding the daily frequent, complex and expensive regeneration and maintenance of equipment, leading the online monitoring and control system to be capable of detecting and feeding back in time, leading all the components to be efficiently matched, the method is suitable for different modes, solves the problems of difficult regeneration and difficult maintenance of the CDPF additionally arranged on the heavy diesel special vehicle, improves the use efficiency, reliability and safety of the system, and reduces the requirements and cost of the use and maintenance of the system.
Drawings
FIG. 1 is a general schematic of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic illustration of the gas circuit during normal operation of the present invention (including cleaning of the electrostatic adsorbent particle trap);
FIG. 4 is a schematic view of the gas path for cleaning the DOC + CDPF tail gas cleanup unit according to the present invention;
fig. 5 is a schematic diagram of the gas path during emergency bypass of the present invention.
The reference numbers in the figures are: 1-DOC + CDPF tail gas purification device, 2-gas path pipeline, 3-electrostatic adsorption particle catcher, 4-online monitoring and control system, 5-electrostatic adsorption particle catcher shell, 6-device gas inlet, 7-first temperature sensor, 8-first pressure sensor, 9-electrostatic adsorption particle catcher cathode adsorption end, 10-electrostatic adsorption particle catcher anode discharge end, 11-electrostatic adsorption particle catcher control wire harness, 12-vehicle-mounted display terminal, 13-vehicle-mounted display terminal transmission wire harness, 14-system control component, 15-temperature sensor wire harness, 16-pressure sensor wire harness, 17-fifth pressure sensor, 18-fifth temperature sensor, 19-device gas outlet, 20-fourth gas path pipeline, 3-electrostatic adsorption particle catcher, 21-DPF assembly, 22-fourth electric butterfly valve, 23-third pressure sensor, 24-third electric butterfly valve, 25-fourth temperature sensor, 26-third gas path pipeline, 27-outer cone end cover, 28-inner cone end cover, 29-heating heat preservation cavity outer cylinder, 30-heating heat preservation cavity partition board, 31-heating heat preservation cavity inner cylinder, 32-DOC + CDPF assembly cylinder, 33-backflow guide end cover, 34-third temperature sensor, 35-first graphite packing ring, 36-second graphite packing ring, 37-CDPF, 38-CDFP heat-resistant damping gasket, 39-DOC, 40-DOC heat-resistant damping gasket, 41-second temperature sensor, 42-second gas path pipeline, 43-first electric butterfly valve, 44-second electric butterfly valve, 45-a first air channel pipeline, 46-an electric butterfly valve control wiring harness, 47-a second pressure sensor and 48-a fourth pressure sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to facilitate understanding of the skilled person.
As shown in fig. 1-5, the self-cleaning exhaust gas purification system for heavy diesel special vehicle comprises a DOC + CDPF exhaust gas purification device 1, an air channel pipeline, a static adsorption particle trap 3, and an online monitoring and control system 4, wherein the DOC + CDPF exhaust gas purification device 1 is connected with the static adsorption particle trap 3 through the air channel pipeline, and the air channel pipeline can change the flow direction of the gas entering the DOC + CDPF exhaust gas purification device 1 along the static adsorption particle trap 3.
Among them, DOC39 (oxidation catalyst) undergoes the following reactions under certain temperature conditions:
CO + 1/2 O2→ CO2
[HC] + O2→ CO2 +H2O
NO + 1/2 O2→ NO2
CDPF37 (catalyzed wall-flow particulate trap) reacts at certain temperatures:
[C] + 2NO2→ 2NO+CO2
DOC + CDPF tail gas cleanup unit 1 is including the heat preservation casing, DOC39, CDPF37, DOC + CDPF subassembly barrel 32 internally mounted has DOC39 and CDPF37, and DOC + CDPF subassembly barrel 32 periphery is provided with carries out the heat preservation casing of parcel to DOC + CDPF subassembly barrel 32, be provided with DOC heat-resisting shock attenuation liner 40 between DOC39 and the DOC + CDPF subassembly barrel 32, be provided with CDPF37 and DOC39 and DOC + CDPF subassembly barrel 32 between CDPF37 heat-resisting shock attenuation liner, DOC39 and DOC + CDPF subassembly barrel 32, CDPF37 adopts 200 mesh asymmetric hole way silicon carbide, can have better high temperature resistance and reliability.
The heat preservation casing includes outer cone end cover 27, interior cone end cover 28, the outer barrel 29 of heating heat preservation chamber, heating heat preservation chamber baffle 30, the intracavity barrel 31 of heating heat preservation, backward flow water conservancy diversion end cover 33, interior cone end cover 28 is installed in DOC + CDPF subassembly barrel 32 front side, and outer cone end cover 27 sets up in interior cone end cover 28 front side to wrap up interior cone end cover 28, be connected with the heating heat preservation chamber outer barrel 29 that carries out the parcel to DOC + CDPF subassembly barrel 32 side on the outer cone end cover 27, be connected with the backward flow water conservancy diversion end cover 33 that carries out the parcel to DOC + CDPF subassembly barrel 32 rear side on the heating heat preservation chamber outer barrel 29, be provided with heating heat preservation chamber baffle 30 between heating heat preservation intracavity barrel 31 and the heating heat preservation chamber outer barrel 29. The outer cone end cover 27, the inner cone end cover 28, the heating and heat preservation cavity outer cylinder 29, the heating and heat preservation cavity partition plate 30, the heating and heat preservation cavity inner cylinder 31 and the backflow guide end cover 33 form a cavity, and the cavity completely surrounds the CDPF37 and the DOC 39. The DOC + CDPF component 21 and the airflow channel that heats the heat preservation chamber and form make the air current can be through the device by DOC39, CDPF37, the order (forward order) of heating the heat preservation chamber, also can heat the order (reverse order) of heat preservation chamber, CDPF37, DOC39 and pass through the device, make the self-cleaning function of blowback mode can implement, as shown in the embodiment shown in figure 2, two air current ports of DOC + CDPF tail gas cleanup unit 1 are arranged in one side, the pipeline arrangement of the air flue of being convenient for, save the whole space of arranging of system.
The inner wall surface of the backflow guide end cover 33 is a guide curved surface formed on the basis of a hemispherical surface and a semicircular surface, and is used for guiding airflow inside the DOC + CDPF tail gas purification device 1 to reduce back pressure when the airflow flows forwards or backwards, and reducing back pressure fluctuation when the airflow direction is switched by a system.
Be provided with the first graphite packing ring 35 that is convenient for axial rotation between heat preservation casing and DOC + CDPF subassembly barrel 32, first graphite packing ring 35 cross section is circular to and second graphite packing ring 36, second graphite packing ring 36 cross section is the rectangle. DOC + CDPF subassembly barrel 32 both ends have outside circular arc turn-ups, heating heat preservation intracavity barrel 31 both ends have semicircle cross-section annular groove, semicircle cross-section annular groove inlays first graphite packing ring 35, first graphite packing ring 35 with DOC + CDPF subassembly barrel 32 both ends circular arc turn-ups laminate mutually, make DOC + CDPF subassembly barrel 32 can the axial rotation, first graphite packing ring 35 agrees with between DOC + CDPF subassembly 21 and heating heat preservation chamber, make DOC + CDPF subassembly 21 have better axial and radial shock attenuation protection effect, and possess the axial rotation ability, can obtain further protection effect in the environment of violent jolting. The wall of the heating and heat-preserving cavity inner cylinder 31 is provided with 3 rectangular section annular grooves, the second graphite packing ring 36 is embedded in the rectangular section annular grooves, and the second graphite packing ring 36 is attached to the outer wall surface of the DOC + CDPF component cylinder 32, so that the ink packing ring and the cylinder wall have a larger contact surface.
Electrostatic absorption particle trap 3 includes electrostatic absorption particle trap casing 5, electrostatic absorption particle trap negative pole adsorption end 9, electrostatic absorption particle trap positive discharge end 10, electrostatic absorption particle trap 5 inside is provided with electrostatic absorption particle trap positive discharge end 10, still is provided with the electrostatic absorption particle trap negative pole adsorption end 9 that carries out the parcel to electrostatic absorption particle trap positive discharge end 10 in the electrostatic absorption particle trap casing 5, discharges through electrostatic absorption particle trap positive discharge end 10 corona, is adsorbed by electrostatic absorption particle trap negative pole adsorption end 9 after making the particulate matter electrified, can play the effect of particulate matter in the entrapment tail gas. The negative adsorption end 9 of the electrostatic adsorption particle catcher is an annular circular cylinder formed by winding a plurality of layers of wavy smooth stainless steel plates with round small holes with burrs, so that particles in tail gas are easily adsorbed along the edges of the burrs of the small holes, and the superposition of the cross sections of the plurality of layers of waves is favorable for adsorbing more particles; meanwhile, the surface of the stainless steel plate is smooth, so that when the electrostatic adsorption particle catcher 3 is powered off and does not work, particles are easy to fall off and release when the vehicle vibrates. The positive electrode discharge end 10 of the electrostatic adsorption particle catcher adopts a structure with sharp spines, and is beneficial to improving the particle adsorption effect of the electrostatic adsorption particle catcher 3.
The air channel pipeline comprises a first air channel pipeline 45, a second air channel pipeline 42, a third air channel pipeline 26, a fourth air channel pipeline 20, an air channel pipeline 25, a DPF assembly 21, a first electric butterfly valve 43, a second electric butterfly valve 44, a third electric butterfly valve 24 and a fourth electric butterfly valve 22, the second air channel pipeline 42 is installed on the inner cone end cover 28, the DPF assembly 21 and the third electric butterfly valve 24 are installed on the second air channel pipeline 42, the first air channel pipeline 45 connected with the electrostatic adsorption particle catcher 3 is installed on the second air channel pipeline 42 between the third electric butterfly valve 24 and the inner cone end cover 28, the first electric butterfly valve 43 is installed on the first air channel 45, the third air channel pipeline 26 is installed on the outer cone end cover 27, the third air channel pipeline 26 is communicated with the fourth air channel pipeline 20 and the air channel pipeline 25, the fourth electric butterfly valve 22 is installed on the fourth air channel pipeline 20, and the fourth air channel pipeline 20 is communicated with the second air channel pipeline 42, the air path pipeline 25 is connected to a first air path pipeline 45 between the electrostatic adsorption particle catcher 3 and the first electric butterfly valve 43, and a second electric butterfly valve 44 is installed on the air path pipeline 25.
The online monitoring and control system 4 comprises a first temperature sensor 7, a first pressure sensor 8, a vehicle-mounted display terminal 12, a system control component 14, a fifth pressure sensor 17, a fifth temperature sensor 18, a third pressure sensor 23, a fourth temperature sensor 25, a third temperature sensor 34, a second temperature sensor 41, a second pressure sensor 47 and a fourth pressure sensor 48, wherein the first temperature sensor 7 and the first pressure sensor 8 are installed at an air inlet of the electrostatic adsorption particle trap 3, the fifth temperature sensor 18 and the fifth pressure sensor 17 are installed at an air outlet of a fourth air path pipeline 20, the third temperature sensor 34 is installed at a backflow guide end cover 33 and is opposite to the center of an end face of F37, the second temperature sensor 41 is installed at a second air path pipeline 42, the fourth temperature sensor 25 is installed at a third air path pipeline 26, the second pressure sensor 47 is installed at an air outlet of the electrostatic adsorption particle trap 3, the third pressure sensor 23 is mounted on a second air channel pipeline 42 between the DPF assembly 21 and the third electric butterfly valve 24, the fourth pressure sensor 48 is mounted on a third air channel pipeline 26, the first temperature sensor 7, the first pressure sensor 8, the fifth pressure sensor 17, the fifth temperature sensor 18, the third pressure sensor 23, the fourth temperature sensor 25, the third temperature sensor 34, the second temperature sensor 41, the second pressure sensor 47 and the fourth pressure sensor 48 are all connected to the system control assembly 14, the system control assembly 14 is further connected with the vehicle-mounted display terminal 12, the vehicle-mounted display terminal 12 can display system running states and parameters, the emergency bypass mode of the system can be started or closed manually, and when the equipment is abnormal, an alarm is given through the vehicle-mounted display terminal 12. Through temperature sensor and pressure sensor real time monitoring device operating data, control electrostatic absorption particle trap 3, first electric butterfly valve 43, second electric butterfly valve 44, third electric butterfly valve 24, fourth electric butterfly valve 22 through the control system subassembly according to data, realize the switching of system's operational mode, secondly, obtain according to representative data through the arrangement position of sensor, more do benefit to the feedback control of system. The online monitoring and control system 4 has a remote online monitoring function, can be connected with a network monitoring platform, and can monitor and store system operation data more conveniently.
The normal air path is as shown in fig. 3, at this time, the first electric butterfly valve 43 and the fourth electric butterfly valve 22 are opened, the second electric butterfly valve 44 and the third electric butterfly valve 24 are closed, so that the tail gas enters from the device air inlet 6, sequentially passes through the electrostatic adsorption particle trap 3, the first air path pipeline 45, the first electric butterfly valve 43, the second air path pipeline 42, the inner cone end cover 28, the DOC39, the CDPF37, the backflow diversion end cover 33, the heating insulation cavity partition plate 30, the outer cone end cover 27, the third air path pipeline 26, the fourth electric butterfly valve 22, the fourth air path pipeline 20, and finally is discharged from the device air outlet 19.
The gas circuit when cleaning DOC + CDPF tail gas cleanup unit is shown in FIG. 4, at this moment, second electric butterfly valve 44, third electric butterfly valve 24 opens, first electric butterfly valve 43, fourth electric butterfly valve 20 closes, make tail gas get into from device air inlet 6, pass through electrostatic adsorption particle trap 3 in proper order, first gas circuit pipeline 45, second electric butterfly valve 44, third gas circuit pipeline 26, outer cone end cover 27, heat preservation chamber baffle 30, backward flow water conservancy diversion end cover 33, CDPF37, DOC39, interior cone end cover 28, second gas circuit pipeline 42, third electric butterfly valve 24, DPF subassembly 21, fourth gas circuit pipeline 20, discharge from device gas outlet 19 at last.
The gas circuit during emergent bypass is as shown in fig. 5, at this moment, second electric butterfly valve 44, fourth electric butterfly valve 22 opens, first electric butterfly valve 43, third electric butterfly valve 24 closes, make tail gas get into from device air inlet 6, pass through electrostatic adsorption particle trap 3 in proper order, first gas circuit pipeline 45, second electric butterfly valve 42, third gas circuit pipeline 26, fourth electric butterfly valve 22, fourth gas circuit pipeline 20, discharge from device gas outlet 19 at last, a large amount of particulate matters are catched behind tail gas passing through electrostatic adsorption particle trap 3, when realizing the emergent bypass of low back pressure, make the system still have better particulate matter purifying effect.
A state to be started: when the system is closed or power is cut off, the system is automatically switched to a state to be started, at the moment, the second electric butterfly valve 44 and the fourth electric butterfly valve 22 are kept open, and the first electric butterfly valve 43 and the third electric butterfly valve 24 are kept closed. When the system is started, the system is switched to other operation modes, and if the system cannot normally operate due to circuit problems, mechanical faults, system faults or other faults when the vehicle is started, the system keeps a state of waiting to be started, so that the device does not influence the operation of the vehicle.
Heating and temperature rising mode: when the electrostatic adsorption particle catcher 3 is started, the first electric butterfly valve 43 and the fourth electric butterfly valve 22 are opened, and the second electric butterfly valve 44 and the third electric butterfly valve 24 are kept closed. The heating and temperature-raising mode gas circuit is shown in fig. 3, at this time, 90% of particulate matters in the exhaust gas are adsorbed and trapped by the electrostatic adsorption particle trap 3, so that excessive soot accumulation when the CDPF37 catalyst is not activated is avoided, part of CO and HC in the exhaust gas is purified by the DOC39, and the purification efficiency is improved along with the temperature rise. Simultaneously, tail gas is after entering DOC + CDPF tail gas purification system 1, through heating heat preservation cavity structure, heats the intensification to core DOC + CDPF subassembly fast with tail gas self heat energy to slowly promote the whole temperature of device.
A heat preservation regeneration mode: the electrostatic adsorption particle trap 3 is closed, the first electric butterfly valve 43 and the fourth electric butterfly valve 22 are kept open, and the second electric butterfly valve 42 and the third electric butterfly valve 24 are kept closed. The heat preservation regeneration mode gas circuit is shown in fig. 3, at this time, the electrostatic adsorption particle catcher 3 is not adsorbing and catching the particulate matters in the tail gas, and the particulate matters adsorbed on the cathode adsorption end of the electrostatic adsorption particle catcher gradually fall off due to the vibration generated by the running of the vehicle and are taken away by the tail gas, and the particulate matters enter the DOC + CDPF assembly together and are caught by the CDPF 37. And at the moment, the noble metal catalyst in the DOC + CDPF component is activated, CO and HC in the tail gas are purified, and the particulate matters are regenerated while being trapped.
A temperature reduction and control mode: the first electric butterfly valve 43, the second electric butterfly valve 44, the fourth electric butterfly valve 20 and the electrostatic adsorption particle catcher 3 are opened, the third electric butterfly valve 24 is controlled to be closed, particles are adsorbed and stored through the electrostatic adsorption particle catcher 3, the particles carried in the tail gas are greatly reduced, the regeneration exothermic reaction in the CDPF37 is reduced, and the temperature of the tail gas is reduced; meanwhile, the second electric butterfly valve 44 is opened to shunt part of the tail gas, and the part of the tail gas passes through the first gas path pipeline 45, the second electric butterfly valve 44, the third gas path pipeline 26, the fourth electric butterfly valve 22 and the fourth gas path pipeline 20 in sequence and is finally discharged from the gas outlet 19 of the device. The temperature reduction and temperature reduction rate regulation of DOC39 and CDPF37 are realized by reducing regeneration reaction and tail gas diversion.
CDPF cleaning mode: second electric butterfly valve 44, third electric butterfly valve 24 and electrostatic absorption particle trap 3 open, and first electric butterfly valve 43, fourth electric butterfly valve 22 close, and the gas circuit is as shown in fig. 4, and a large amount of particulate matters are caught after the tail gas passes through electrostatic absorption particle trap 3, and the tail gas that carries few particulate matters carries out the direction to CDPF37 and sweeps, blows out the ash that can not be regenerated and with DPF subassembly 21 entrapment, realizes the cleanness to DOC + CDPF tail gas cleanup unit 1.
Electrostatic adsorption particle trap cleaning mode of the examples: the first electric butterfly valve 43 and the fourth electric butterfly valve 22 are opened, the second electric butterfly valve 44, the third electric butterfly valve 24 and the electrostatic adsorption particle catcher 3 are closed, the gas circuit is as shown in fig. 1, the particles adsorbed in the electrostatic adsorption particle catcher 3 fall off and are released when the vehicle shakes and enter the CDPF37 along with the tail gas for regeneration, and the electrostatic adsorption particle catcher 3 is cleaned.
When the temperature and regeneration regulation is carried out, the following methods are adopted:
A. the first electric butterfly valve 43 and the fourth electric butterfly valve 22 are controlled to be opened through the control system component 14, the second electric butterfly valve 44 and the third electric butterfly valve 24 are controlled to be closed, so that tail gas enters from the device air inlet 6 and sequentially passes through the electrostatic adsorption particle catcher 3, the first air channel pipeline 45, the first electric butterfly valve 43, the second air channel pipeline 42, the inner cone end cover 28, the DOC39, the CDPF37, the backflow diversion end cover 33, the heating insulation cavity partition plate 30, the outer cone end cover 27, the third air channel pipeline 26, the fourth electric butterfly valve 22 and the fourth air channel pipeline 20, and finally is discharged from the device air outlet 19. The DOC39 and the CDPF37 are heated and insulated when the tail gas passes through the chamber by utilizing the heat energy of the tail gas, and the electrostatic adsorption particle catcher 3 temporarily stores and gradually releases particles in the tail gas to realize the regulation and control of the CDPF temperature and regeneration;
B. when the temperature measured by the second temperature sensor 41 or the third temperature sensor 34 is lower than the activation temperature of the DOC39 or the CDPF37, the control system component 14 controls the first electric butterfly valve 43, the fourth electric butterfly valve 22 and the electrostatic adsorption particle trap 3 to be opened, controls the second electric butterfly valve 44 and the third electric butterfly valve 24 to be closed, and adsorbs and stores the particles in the tail gas through the electrostatic adsorption particle trap 3, so that the tail gas carrying a small amount of particles heats the DOC + CDPF tail gas purification device 1;
C. when the temperature measured by the third temperature sensor 34 is higher than the activation temperature of DOC39 and CDPF37, and the temperature difference between the temperature measured by the second temperature sensor 41 and the temperature measured by the fourth temperature sensor 25 and the temperature measured by the third temperature sensor 34 is smaller than the set value, the control system component 14 controls the first electric butterfly valve 43 and the fourth electric butterfly valve 22 to be opened, and controls the second electric butterfly valve 44, the third electric butterfly valve 24 and the electrostatic adsorption particle catcher 3 to be closed. The particles adsorbed and stored in the electrostatic adsorption particle catcher 3 are gradually released, and enter the DOC + CDPF tail gas purification device 1 along with the tail gas carrying a large amount of particles, and the large amount of particles are captured and regenerated in the CDPF 37. When high-temperature tail gas formed after the heat release of the regeneration reaction passes through the chamber, the heat preservation of DOC39 and CDPF37 is realized, and the temperature uniformity in DOC39 and CDPF37 is improved;
D. when the temperatures measured by the third temperature sensor 34 and the fourth temperature sensor 25 are higher than the set temperature, the control system component 14 controls the first electric butterfly valve 43, the second electric butterfly valve 44, the fourth electric butterfly valve 22 and the electrostatic adsorption particle catcher 3 to be opened, and controls the third electric butterfly valve 24 to be closed. Adsorb the particulate matter in the storage tail gas through electrostatic adsorption particle trap 3, reduce the particulate matter that carries when tail gas gets into DOC + CDPF tail gas cleanup unit 1 by a wide margin, slow down the regeneration reaction rate in the CDPF37, reduce the regeneration and release heat, realize regeneration regulation and control, reduce the rate of rise of temperature. Meanwhile, the second electric butterfly valve 44 is opened to shunt part of the tail gas, and the tail gas carrying few particles passes through the first gas path pipeline 45, the second electric butterfly valve 44, the third gas path pipeline 26, the fourth electric butterfly valve 22 and the fourth gas path pipeline 20 in sequence and is finally discharged from the gas outlet 19 of the device. The DOC39 and CDPF37 temperature reduction and temperature reduction rate regulation are realized by slowing down the regeneration reaction and the tail gas diversion.
When the automatic mutual cleaning work is carried out, the following method is provided:
A. when the difference between the pressure values measured by the second pressure sensor 47 and the fifth pressure sensor 17 is still large after the system is operated for a settable period of time or the CDPF37 is regenerated after the settable period of time is exceeded, it indicates that the CDPF37 needs cleaning, wherein the regeneration of the CDPF37 is determined by the temperature difference between the front end and the rear end. The second electric butterfly valve 44 is controlled by the control system component 14, the third electric butterfly valve 24 and the electrostatic adsorption particle catcher 3 are opened, the first electric butterfly valve 43 is controlled, and the fourth electric butterfly valve 22 is closed, so that tail gas enters from the device air inlet 6, the tail gas sequentially passes through the electrostatic adsorption particle catcher 3, the first air path pipeline 45, the second electric butterfly valve 44, the third air path pipeline 26, the outer cone end cover 27, the heating heat preservation cavity partition plate 30 backflow diversion end cover 33, the CDPF37, the DOC39, the inner cone end cover 28, the second air path pipeline 42, the third electric butterfly valve 24, the DPF component 21, the fourth air path pipeline 20, and finally the tail gas is discharged from the device air outlet 19. The electro-adsorption particle catcher 3 is used for adsorbing and storing particles in the tail gas, so that the tail gas carrying a small amount of particles reversely sweeps the CDPF37, the regenerated residual ash is blown out and caught by the DPF assembly 21, and the DOC + CDPF tail gas purification device 1 is cleaned;
B. when the temperature measured by the third temperature sensor 34 is higher than the activation temperature of DOC39 and CDPF37, and the temperature difference between the temperature measured by the second temperature sensor 41 and the temperature measured by the fourth temperature sensor 25 and the temperature measured by the third temperature sensor 34 is smaller than a set value, the control system component 14 controls the first electric butterfly valve 43 and the fourth electric butterfly valve 22 to be opened, and controls the second electric butterfly valve 44, the third electric butterfly valve 24 and the electrostatic adsorption particle trap 3 to be closed, so that the tail gas enters from the device air inlet 6, sequentially passes through the electrostatic adsorption particle trap 3, the first air passage pipe 45, the first electric butterfly valve 43, the second air passage pipe 42, the inner cone end cover 28, the DOC39, the CDPF37, the backflow diversion end cover 33, the heating insulation cavity partition plate 30, the outer cone end cover 27, the third air passage 26, the fourth electric butterfly valve 22 and the fourth air passage pipe 20, and finally is discharged from the device air outlet 19. The particles adsorbed in the electrostatic adsorption particle catcher 3 are released and enter the CDPF37 along with the tail gas for trapping and regeneration, so that the electrostatic adsorption particle catcher 3 is cleaned.
On one hand, the DOC carrier and the CDPF carrier are heated and insulated by utilizing the heat energy of the tail gas, the carrier heat dissipation is reduced, the temperature fluctuation caused by the fluctuation of working conditions is reduced, the time window of regeneration temperature is prolonged, the continuous passive regeneration of a DOC + CDPF system is promoted, and the running backpressure of the system is kept stable; on the other hand, the electrostatic adsorption particle catcher is used for adsorbing, storing and gradually releasing particles in the tail gas, so that CDPF regeneration regulation and control are realized, the CDPF is prevented from being blocked due to accumulation of excessive particles at low temperature and from being damaged due to severe regeneration of the excessive particles at high temperature, the online monitoring and control system can detect and feed back in time, all the components are matched efficiently, and different modes are adapted; by the automatic mutual cleaning method, the electrostatic adsorption particle catcher and the DOC + CDPF tail gas purification device are mutually assisted for cleaning, so that the system has a self-cleaning function, and the daily frequent, complex and expensive equipment regeneration maintenance is avoided; DOC + CDPF tail gas clean-up system is through carrying out liner parcel encapsulation to DOC carrier and CDPF carrier to set up graphite packing shock-absorbing structure and outer cavity (heating heat preservation chamber), make DOC and CDPF obtain fully protecting under the violent jolt condition. The system effectively improves the use efficiency of the system and the service life of products by avoiding the damage of a core carrier, reduces the use and maintenance cost of the system and reduces the secondary energy consumption caused by maintenance service; by the emergency bypass method, the actual requirement that the heavy diesel special vehicle needs to run at full load under emergency is met, and the electrostatic adsorption device adsorbs particulate matters in the tail gas, so that the system still has a very high tail gas particle purification effect when the emergency bypass function is realized. Aiming at the characteristics of poor original exhaust and low exhaust temperature of heavy diesel special vehicle tail gas, large working condition fluctuation, severe jolt and difficulty in frequently maintaining equipment in an operating environment, the system adopts DOC + CDPF technology to purify CO, HC and PM in the tail gas, realizes the functions of core ceramic part protection, temperature and regeneration regulation, self-cleaning and emergency bypass by designing a tail gas heating heat preservation cavity structure, a graphite packing damping structure and configuring an electrostatic adsorption particle catcher, a gas path pipeline and an online monitoring and control system, solves the problems of difficulty in regeneration and maintenance of CDPF additionally arranged on a heavy diesel special vehicle, improves the use efficiency, reliability and safety of the system, and reduces the requirements and cost of use and maintenance of the system.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the utility model, and that, although the utility model has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the utility model as defined by the appended claims.
Claims (9)
1. The utility model provides a self-cleaning tail gas clean-up system for heavy diesel oil special type vehicle which characterized in that: the self-cleaning tail gas purification system for the heavy diesel special vehicle comprises a DOC + CDPF tail gas purification device (1), an air channel pipeline (2), a static adsorption particle trap (3) and an online monitoring and control system (4), wherein the DOC + CDPF tail gas purification device (1) is connected with the static adsorption particle trap (3) through the air channel pipeline (2), and the air channel pipeline (2) can change the flow direction of gas entering the DOC + CDPF tail gas purification device (1) along the static adsorption particle trap (3).
2. The self-cleaning exhaust gas purification system for heavy-duty diesel utility vehicles of claim 1, wherein: DOC + CDPF tail gas cleanup unit (1) is including heat preservation casing, DOC (39), CDPF (37), DOC + CDPF subassembly barrel (32) internally mounted has DOC (39) and CDPF (37), and DOC + CDPF subassembly barrel (32) periphery is provided with carries out the heat preservation casing of parcel to DOC + CDPF subassembly barrel (32).
3. The self-cleaning exhaust gas purification system for heavy-duty diesel utility vehicles of claim 2, wherein: the heat preservation shell comprises an outer cone end cover (27), an inner cone end cover (28), an outer heating heat preservation cavity barrel body (29), a heating heat preservation cavity partition plate (30), an inner heating heat preservation cavity barrel body (31) and a backflow flow guide end cover (33), wherein the inner cone end cover (28) is installed on the front side of the DOC + CDPF component barrel body, the outer cone end cover (27) is arranged on the front side of the inner cone end cover (28) and wraps the inner cone end cover (28), the outer cone end cover (27) is connected with the outer heating heat preservation cavity barrel body (29) which wraps the lateral side of the DOC + CDPF component barrel body, the outer heating heat preservation cavity barrel body (29) is connected with the backflow flow guide end cover (33) which wraps the rear side of the DOC + CDPF component barrel body, and the heating heat preservation cavity partition plate (30) is arranged between the inner heating heat preservation cavity barrel body (31) and the outer heating heat preservation cavity barrel body (29).
4. The self-cleaning exhaust gas purification system for heavy-duty diesel utility vehicles of claim 3, wherein: the inner wall surface of the backflow flow guide end cover (33) is a flow guide curved surface formed on the basis of a hemispherical surface and a semicircular surface and used for guiding airflow in the DOC + CDPF tail gas purification device (1) to reduce back pressure when the airflow flows forwards or backwards and reducing back pressure fluctuation when the airflow direction is switched by a system.
5. The self-cleaning exhaust gas purification system for heavy-duty diesel utility vehicles according to claim 2 or 4, wherein: and a DOC heat-resistant damping gasket (40) is arranged between the DOC (39) and the DOC + CDPF component cylinder (32), and a CDPF heat-resistant damping gasket (38) is arranged between the CDPF and the DOC + CDPF component cylinder (32).
6. The self-cleaning exhaust gas purification system for heavy-duty diesel utility vehicles of claim 5, wherein: be provided with between heat preservation casing and DOC + CDPF subassembly barrel (32) and be convenient for axial pivoted first graphite packing ring (35) to and second graphite packing ring (36).
7. The self-cleaning exhaust gas purification system for heavy-duty diesel utility vehicles according to claim 1 or 6, wherein: the electrostatic adsorption particle catcher (3) comprises an electrostatic adsorption particle catcher shell (5), an electrostatic adsorption particle catcher negative adsorption end (9) and an electrostatic adsorption particle catcher positive discharge end (10), wherein the electrostatic adsorption particle catcher shell (5) is internally provided with the electrostatic adsorption particle catcher positive discharge end (10), and the electrostatic adsorption particle catcher negative adsorption end (9) wrapping the electrostatic adsorption particle catcher positive discharge end (10) is also arranged in the electrostatic adsorption particle catcher shell (5).
8. The self-cleaning exhaust gas purification system for heavy-duty diesel utility vehicles of claim 7, wherein: the air channel pipeline (2) comprises a first air channel pipeline (45), a second air channel pipeline (42), a third air channel pipeline (26), a fourth air channel pipeline (20), an air channel pipeline 5, a DPF assembly (21), a first electric butterfly valve (43), a second electric butterfly valve (44), a third electric butterfly valve (24) and a fourth electric butterfly valve (22), the second air channel pipeline (42) is installed on the inner cone end cover (28), the DPF assembly (21) and the third electric butterfly valve (24) are installed on the second air channel pipeline (42), a first air channel pipeline (45) connected with the electrostatic adsorption particle catcher (3) is installed on the second air channel pipeline (42) between the third electric butterfly valve (24) and the inner cone end cover (28), a first electric butterfly valve (43) is installed on the first air channel pipeline (45), and the third air channel pipeline (26) is installed on the outer cone end cover (27), third gas circuit pipeline (26) is linked together with fourth gas circuit pipeline (20), gas circuit pipeline 5, install fourth electric butterfly valve (22) on fourth gas circuit pipeline (20), and fourth gas circuit pipeline (20) are linked together with second gas circuit pipeline (42), gas circuit pipeline 5 is connected to on first gas circuit pipeline (45) between electrostatic absorption particle catcher (3) and first electric butterfly valve (43), and installs second electric butterfly valve (44) on the gas circuit pipeline 5.
9. The self-cleaning exhaust gas purification system for heavy-duty diesel utility vehicles of claim 1 or 8, wherein: the online monitoring and control system (4) comprises a first temperature sensor (7), a first pressure sensor (8), a vehicle-mounted display terminal (12), a system control component (14), a fifth pressure sensor (17), a fifth temperature sensor (18), a third pressure sensor (23), a fourth temperature sensor (25), a third temperature sensor (34), a second temperature sensor (41), a second pressure sensor (47) and a fourth pressure sensor (48), wherein the first temperature sensor (7) and the first pressure sensor (8) are arranged at an air inlet (6) of the electrostatic adsorption particle catcher (3), the fifth temperature sensor (18) and the fifth pressure sensor (17) are arranged at an air outlet (19) on a fourth air channel (20), the third temperature sensor (34) is arranged at a backflow diversion end cover (33) and is opposite to the end face center of a CDPF (37), a second temperature sensor (41) is arranged on a second air path pipeline (42), a fourth temperature sensor (25) is arranged on a third air path pipeline (26), a second pressure sensor (47) is arranged at the position of an air outlet of the electrostatic adsorption particle catcher (3), a third pressure sensor (23) is arranged on the second air path pipeline (42) between the DPF assembly (21) and a third electric butterfly valve (24), a fourth pressure sensor (48) is arranged on the third air path pipeline (26), and the first temperature sensor (7), the first pressure sensor (8), the fifth pressure sensor (17), the fifth temperature sensor (18), the third pressure sensor (23), the fourth temperature sensor (25), the third temperature sensor (34), the second temperature sensor (41), the second pressure sensor (47) and the fourth pressure sensor (48) are all connected to a system control assembly (14), the system control component (14) is also connected with a vehicle-mounted display terminal (12).
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| CN202121959148.XU CN216617625U (en) | 2021-08-20 | 2021-08-20 | Self-cleaning tail gas purification system for heavy diesel special vehicle |
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| CN202121959148.XU CN216617625U (en) | 2021-08-20 | 2021-08-20 | Self-cleaning tail gas purification system for heavy diesel special vehicle |
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