Tail gas aftertreatment arrangement and control system

Abstract

The invention relates to the technical field of tail gas aftertreatment, and discloses a tail gas aftertreatment arrangement and control system which comprises a heater, DOC / DPF equipment, SCR equipment, a fan assembly, a urea tank assembly, a PLC module and a support assembly. According to the tail gas after-treatment arrangement and control system, the layout of all the components is optimized, the overall structure is more stable and compact, the multiple sensors are matched for monitoring the temperature, pressure, flow and other parameters of multiple positions in the system, the working states of all the components meet the requirements, particularly, the spraying amount of urea can be accurately regulated and controlled, and the working efficiency is improved. And the tail gas after-treatment effect and efficiency are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust gas post-processing, and in particular to an exhaust gas post-processing arrangement and control system. Background Art

[0002] With the increasingly stringent environmental protection requirements, the emission pollutants of traditional diesel engines are also one of the environmental pollutants. The main pollutants emitted by diesel engines are NMHC, NOx, and PM, which not only affect the environment, but also have adverse effects on human health. The NMHC emitted by diesel engines is treated by DOC (diesel oxidation catalyst); the PM emitted by diesel engines is treated by DPF (diesel particulate filter); the NOx emitted by diesel engines uses SCR (selective catalytic reduction technology) to denitrate the exhaust gas. Among them, SCR first sprays a reducing agent into the exhaust gas at a temperature of 170℃ to 550℃. The reducing agent can be pure ammonia, ammonia water or urea solution. Since urea is easy to store and transport, it is generally the first choice as a reducing agent. Urea is atomized by a spray gun, pyrolyzed or hydrolyzed into ammonia; then, the mixture of ammonia and exhaust gas undergoes a catalytic reaction through a catalyst, converting nitrogen oxides into nitrogen and water vapor before being discharged, thereby reducing the NOx content in the exhaust gas.

[0003] Therefore, many diesel engine manufacturers need to temporarily add DOC / DPF / SCR layout solutions in order to meet the national emission requirements. However, DOC / DPF / SCR equipment has high technical requirements and complex structure. The space occupied by installation and the operating space required for catalyst replacement are very large. In addition, DOC / DPF / SCR equipment vibrates violently during operation, and the corresponding pipelines need to add more fixed supports.

[0004] Some manufacturers currently use a linear layout, which avoids the safety problems caused by the severe vibration of the DOC / DPF / SCR equipment, but the space they occupy is too long; some manufacturers use a stacked layout, and the DOC / DPF / SCR equipment is relatively high, so the safety problems caused by severe vibration may not be discovered in time; some other manufacturers, in order to save space and cost, will save a lot of sensors and rely on theoretical values ​​to spray urea. They cannot correct the injection amount in real time, and the processing efficiency cannot be guaranteed. Summary of the invention

[0005] The object of the present invention is to provide an exhaust gas aftertreatment arrangement and control system to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An exhaust gas aftertreatment arrangement and control system includes a heater, a DOC / DPF device, an SCR device, a fan assembly, a urea tank assembly, a PLC module and a bracket assembly, wherein:

[0008] The heater, the DOC / DPF device, and the SCR device are respectively installed on the bracket assembly, the heater is provided with an exhaust gas inlet, the air outlet of the heater is connected with the air inlet of the DOC / DPF device, the air outlet of the DOC / DPF device is connected with the air inlet of the SCR device, and the air outlet of the SCR device is connected with the fan assembly;

[0009] The air inlet of the DOC / DPF device is provided with a first pressure sensor and a first temperature sensor connected to the PLC module signal;

[0010] A urea nozzle and a differential pressure flowmeter connected to the PLC module signal are provided on the connecting pipe between the air outlet of the DOC / DPF device and the air inlet of the SCR device. The urea tank assembly is connected to the urea nozzle through a urea supply pipeline. A metering pump connected to the PLC module signal is provided on the urea supply pipeline.

[0011] The air inlet of the SCR device is provided with a first nitrogen oxide sensor, a second pressure sensor and a second temperature sensor connected to the PLC module signal;

[0012] The air outlet of the SCR device is provided with a second nitrogen oxide sensor, a third pressure sensor and a third temperature sensor which are connected to the PLC module signal.

[0013] As an optional solution, the fan assembly includes a first fan and a second fan, the first fan is installed at the air outlet of the SCR device, the air outlet of the first fan is connected to the air inlet of the second fan, and the air outlet of the second fan is connected to the chimney.

[0014] As an optional solution, the bracket assembly includes a first bracket and a second bracket, the first bracket is fixed to the ground and the first wall, the heater and the DOC / DPF device are connected and installed on the first layer of the first bracket, the SCR device and the first fan are connected and installed on the second layer of the first bracket, the urea tank assembly is fixed on the ground and located on one side of the first bracket, the second bracket is suspended and fixed on the first wall, and the second fan is installed on the second bracket.

[0015] As an optional solution, a first travel switch for measuring the lateral displacement of the first bracket and a second travel switch for measuring the downward displacement of the second bracket are arranged on the first wall, and the first travel switch and the second travel switch are respectively connected to the PLC module signal.

[0016] As an optional solution, one end of the second bracket is fixed on the first wall, and the other end of the second bracket is fixed on a second wall parallel to the first wall, so that a walking passage is formed between the first bracket and the second wall.

[0017] As an optional solution, the urea tank assembly includes a urea solution tank, on which a liquid level sensor and a liquid filling port are provided, and the liquid level sensor is connected to a PLC module signal.

[0018] As an optional solution, the urea tank assembly includes a urea solution tank, on which a fourth temperature sensor and an electric heating component are provided, and the fourth temperature sensor and the electric heating component are respectively connected to the PLC module signal.

[0019] As an optional solution, an electric heating component is provided on the metering pump and / or the urea supply pipeline, and a heat insulation cover is provided on the urea nozzle.

[0020] As an optional solution, the DOC / DPF device is provided with a maintenance port for easy inspection and replacement of the catalyst.

[0021] As an optional solution, the exhaust gas after-treatment arrangement and control system also includes a after-treatment control cabinet assembly, a heating electrical cabinet and a fan electrical cabinet. The air outlet of the heater is provided with a thermocouple. The heater and the thermocouple are respectively connected to the heating electrical cabinet signal, the fan assembly is connected to the fan electrical cabinet signal, the heating electrical cabinet and the fan electrical cabinet are respectively connected to the after-treatment control cabinet assembly signal, and the after-treatment control cabinet assembly is connected to the PLC module signal.

[0022] Beneficial effects of the present invention: The exhaust gas after-treatment arrangement and control system optimizes the layout of various components, making the overall structure more stable and compact, and cooperates with multiple sensors to monitor parameters such as temperature, pressure, flow rate, etc. at multiple locations in the system, so that the working state of each component meets the requirements, especially the injection amount of urea can be accurately controlled, ensuring the effect and efficiency of exhaust gas after-treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a front view of an exhaust gas aftertreatment arrangement and control system provided by an embodiment of the present invention;

[0024] Figure 2 is a top view of an exhaust gas aftertreatment arrangement and control system provided by an embodiment of the present invention;

[0025] Figure 3 yes Figure 1 Sectional view at AA;

[0026] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0027] Figure 5 yes Figure 3 Enlarged view of center C.

[0028] In the attached figure:

[0029] 1. Heater; 11. Exhaust gas inlet; 12. Thermocouple;

[0030] 2. DOC / DPF equipment; 21. First pressure sensor; 22. First temperature sensor; 23. Maintenance port;

[0031] 3. SCR equipment; 31. differential pressure flowmeter; 32. first nitrogen oxide sensor; 33. second pressure sensor; 34. second temperature sensor; 35. second nitrogen oxide sensor; 36. third pressure sensor; 37. third temperature sensor;

[0032] 4. fan assembly; 41. first fan; 42. second fan;

[0033] 5. Urea tank assembly; 51. Urea nozzle; 52. Urea supply pipeline; 53. Metering pump; 54. Urea solution tank;

[0034] 6. PLC module;

[0035] 7. Bracket assembly; 71. First bracket; 72. Second bracket;

[0036] 8. Chimney;

[0037] 9. Ground;

[0038] 10. First wall; 101. First travel switch; 102. Second travel switch;

[0039] 20. Second wall;

[0040] 30. Post-processing control cabinet assembly;

[0041] 40. Heating electrical cabinet;

[0042] 50. Fan electrical cabinet. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0047] See also Figures 1 to 5 As shown, this embodiment provides an exhaust gas post-treatment arrangement and control system, including a heater 1, a DOC / DPF device 2, an SCR device 3, a fan assembly 4, a urea tank assembly 5, a PLC module 6 and a bracket assembly 7, wherein:

[0048] The heater 1, the DOC / DPF device 2, and the SCR device 3 are respectively mounted on the bracket assembly 7. The heater 1 is provided with an exhaust gas inlet 11. The air outlet of the heater 1 is connected to the air inlet of the DOC / DPF device 2. The air outlet of the DOC / DPF device 2 is connected to the air inlet of the SCR device 3. The air outlet of the SCR device 3 is connected to the fan assembly 4.

[0049] The air inlet of the DOC / DPF device 2 is provided with a first pressure sensor 21 and a first temperature sensor 22 which are signal-connected to the PLC module 6;

[0050] A urea nozzle 51 and a differential pressure flowmeter 31 connected to the signal of the PLC module 6 are provided on the connecting pipe between the air outlet of the DOC / DPF device 2 and the air inlet of the SCR device 3. The urea tank assembly 5 is connected to the urea nozzle 51 through a urea supply pipeline 52. A metering pump 53 connected to the signal of the PLC module 6 is provided on the urea supply pipeline 52.

[0051] The air inlet of the SCR device 3 is provided with a first nitrogen oxide sensor 32, a second pressure sensor 33 and a second temperature sensor 34 which are signal-connected to the PLC module 6;

[0052] The gas outlet of the SCR device 3 is provided with a second nitrogen oxide sensor 35 , a third pressure sensor 36 and a third temperature sensor 37 which are signal-connected to the PLC module 6 .

[0053] Specifically, the heater 1 is used to heat the exhaust gas entering from the exhaust gas inlet 11 so that the exhaust gas is maintained at a temperature suitable for the reaction;

[0054] The first pressure sensor 21 and the first temperature sensor 22 feed back the pressure signal and temperature signal of the detected exhaust gas to the PLC module 6. At a suitable reaction temperature, the catalyst in the DOC / DPF device 2 reacts with the exhaust gas, the DOC catalytically oxidizes HC, and the DPF captures PM; and when the engine exhaust temperature is high, the NO2 in the exhaust gas will react with the deposited particulate matter to achieve passive regeneration of the DPF;

[0055] The differential pressure flowmeter 31 feeds back the flow signal of the remaining unreacted exhaust gas passing through the DOC / DPF device 2 to the PLC module 6. The PLC module 6 calculates the volume of urea solution theoretically required for the reaction with the exhaust gas, and transmits the instruction to the metering pump 53. After the metering pump 53 accurately measures, the urea solution in the urea tank assembly 5 is transmitted to the urea nozzle 51 through the urea supply pipeline 52. The urea nozzle 51 performs secondary atomization on the urea solution.

[0056] The first nitrogen oxide sensor 32 and the second nitrogen oxide sensor 35 transmit the detected real-time NOx values ​​before and after the reaction of the SCR device 3 to the PLC module 6 and the NOx emission exceeding standard alarm, so that the PLC module 6 can calculate, correct and adjust the urea injection amount actually required for the reaction in a timely manner, and then adjust the injection amount of the metering pump 53 and the urea nozzle 51;

[0057] The first pressure sensor 21 and the second pressure sensor 33 transmit the detected pressure signals before and after the SCR reaction to the PLC module 6, so that the PLC module 6 can calculate the pressure difference in time. If the pressure difference is too high, an alarm will be issued to remind the maintenance personnel to check and maintain in time.

[0058] The first temperature sensor 22 and the second temperature sensor 34 transmit the detected SCR front and rear temperature signals to the PLC module 6 to ensure that the temperature before and after the reaction meets the requirements;

[0059] The SCR device 3 reduces the NOx in the exhaust gas, thereby effectively reducing the HC, PM and NOx in the exhaust gas. Finally, the exhaust gas that meets the national standards is discharged into the atmosphere through the fan assembly 4.

[0060] Among them, the differential pressure flowmeter 31, the first nitrogen oxide sensor 32 and the second nitrogen oxide sensor 35, and the PLC module 6 cooperate with each other to correct the urea injection amount in real time, avoiding the injection amount being too small, which will cause the nitrogen oxide conversion rate to be too low and thus fail to meet the emission standards, and avoiding the injection amount being too large, which will lead to excessive costs and even cause ammonia leakage.

[0061] Therefore, the exhaust gas after-treatment arrangement and control system optimizes the layout of each component, making the overall structure more stable and compact, and cooperates with multiple sensors to monitor the temperature, pressure, flow and other parameters in multiple locations in the system, so that the working status of each component meets the requirements. In particular, the injection amount of urea can be accurately controlled to ensure the effect and efficiency of exhaust gas after-treatment.

[0062] Optionally, the fan assembly 4 includes a first fan 41 and a second fan 42 , the first fan 41 is installed at the air outlet of the SCR device 3 , the air outlet of the first fan 41 is connected to the air inlet of the second fan 42 , and the air outlet of the second fan 42 is connected to the chimney 8 .

[0063] Therefore, two sets of fans are used to offset the exhaust resistance generated by the DOC / DPF device 2 and the SCR device 3 and the resistance of the transportation pipeline, so that the exhaust gas that finally meets the national standards can be discharged into the atmosphere more smoothly.

[0064] Optionally, the bracket assembly 7 includes a first bracket 71 and a second bracket 72, the first bracket 71 is fixed on the ground 9 and the first wall 10, the heater 1 and the DOC / DPF device 2 are connected and installed on the first layer of the first bracket 71, the SCR device 3 and the first fan 41 are connected and installed on the second layer of the first bracket 71, the urea tank assembly 5 is fixed on the ground 9 and is located on one side of the first bracket 71, the second bracket 72 is suspended and fixed on the first wall 10, and the second fan 42 is installed on the second bracket 72.

[0065] In this structure, the bracket assembly 7 is reliably fixed, and the heater 1, the DOC / DPF device 2 and the SCR device 3 are reasonably arranged, which reduces the occupied space and solves the potential safety problems caused by vibration during the operation of the equipment.

[0066] Furthermore, one end of the second bracket 72 is fixed on the first wall 10 , and the other end of the second bracket 72 is fixed on the second wall 20 parallel to the first wall 10 , so that a walking passage is formed between the first bracket 71 and the second wall 20 .

[0067] Thus, the second bracket 72 is suspended and fixed between the first wall 10 and the second wall 20, which fully utilizes the reliable fixed fulcrum while leaving enough walking space.

[0068] Furthermore, the first wall surface 10 is provided with a first travel switch 101 for measuring the lateral displacement of the first bracket 71 and a second travel switch 102 for measuring the downward displacement of the second bracket 72, see Figure 4 and Figure 5 The first travel switch 101 and the second travel switch 102 are respectively connected to the PLC module 6 by signal.

[0069] Specifically, the second travel switch 102 is installed at the lower end of the second bracket 72. When the second bracket 72 becomes loose and moves down 5 mm, the second travel switch 102 will be triggered. The second travel switch 102 transmits a signal to the PLC module 6 and alarms, promptly reminding the maintenance personnel to inspect the loose bolts. Second travel switches 102 are respectively provided on the first wall 10 and the second wall 20. The two second travel switches 102 are connected in parallel. If any one of the second travel switches 102 fails, the other can still work normally, with high safety and reliability.

[0070] Similarly, the first travel switch 101 between the first bracket 71 and the first wall 10 is also at a distance of 5 mm. When the first bracket 71 becomes loose and moves sideways by 5 mm, the first travel switch 101 will be triggered, and the first travel switch 101 will transmit a signal to the PLC module 6 and sound an alarm.

[0071] Optionally, the urea tank assembly 5 includes a urea solution tank 54 , and a liquid level sensor and a liquid replenishing port are provided on the urea solution tank 54 . The liquid level sensor is signal-connected to the PLC module 6 .

[0072] The urea solution tank 54 is used to store urea solution, and can accurately transmit the liquid level and temperature signals in the urea solution tank 54 to the PLC module 6. When the liquid level in the urea solution tank 54 is lower than the design value, the liquid level sensor transmits a signal to the PLC module 6 to alarm and alarm for low liquid level, and replenishes urea solution in time through the liquid replenishing port; otherwise, a high liquid level alarm is issued and the liquid replenishment is stopped, and the excess urea solution in the urea solution tank 54 is automatically discharged.

[0073] The end covers on both sides of the urea solution tank 54 here are formed by integrated stamping, the cylinder is roll-formed, and the cylinder and the end covers are welded by robots. This welding method is firm, reliable and beautiful; the liquid filling port can be automatic or manual. When adding liquid automatically, the liquid level display on the LCD screen can be observed in the remote monitoring room. When adding liquid manually, the mechanical liquid level gauge can be directly read. This ensures that even if the liquid level sensor fails and the urea solution tank 54 cannot be automatically filled, manual inspection and filling can be carried out through the mechanical liquid level gauge, which realizes double insurance for the normal supply of liquid level.

[0074] Furthermore, a fourth temperature sensor and an electric heating component are provided on the urea solution tank 54 , and the fourth temperature sensor and the electric heating component are respectively connected to the PLC module 6 by signals.

[0075] When the temperature in the urea solution tank 54 is lower than the design temperature (-40°C), the fourth temperature sensor feeds back a signal to the PLC module 6, and the PLC module 6 controls the electric heating component to heat the urea solution to the design temperature; conversely, when the temperature is higher than the design temperature (70°C), the PLC module 6 controls the electric heating component to stop heating.

[0076] Furthermore, an electric heating component is provided on the metering pump 53 and / or the urea supply pipeline 52 , and a heat insulation cover is provided on the urea nozzle 51 .

[0077] Among them, the metering pump 53 is provided with a heating function to ensure that it can still work normally at -40°C, with high safety and reliability. The metering pump 53 also has an OBD diagnostic function, which can diagnose, record and transmit its own faults, reducing the troubleshooting time of after-sales personnel and improving maintenance efficiency; the urea supply pipeline 52 has a heating and thawing function, and will automatically work when the temperature of the urea solution in the urea supply pipeline 52 is lower than the set value, thus ensuring the normal flow of the urea solution in the urea supply pipeline 52; the urea nozzle 51 has a heat insulation design, which can effectively prevent the risk of urea crystallization.

[0078] Optionally, the DOC / DPF device 2 is provided with a maintenance port 23 for checking and replacing the catalyst. Similarly, the catalyst of the SCR device 3 can be replaced by disassembling the flange, which is fast and efficient.

[0079] Optionally, the exhaust gas after-treatment arrangement and control system also includes a after-treatment control cabinet assembly 30, a heating electrical cabinet 40 and a fan electrical cabinet 50, the air outlet of the heater 1 is provided with a thermocouple 12, the heater 1 and the thermocouple 12 are respectively connected to the heating electrical cabinet 40 for signal, the fan assembly 4 is connected to the fan electrical cabinet 50 for signal, the heating electrical cabinet 40 and the fan electrical cabinet 50 are respectively connected to the after-treatment control cabinet assembly 30 for signal, and the after-treatment control cabinet assembly 30 is connected to the PLC module 6 for signal.

[0080] Thus, the exhaust gas flows through the heater 1, and the temperature is detected by the thermocouple 12. When it is detected that the outlet temperature of the heater 1 is lower than the set reaction temperature, the heater 1 automatically heats up; otherwise, the heating is stopped to achieve automatic adjustment of the outlet temperature.

[0081] It can be seen that the exhaust gas aftertreatment arrangement and control system has the following advantages:

[0082] 1) The equipment has low exhaust resistance and little impact on the engine power generation and fuel economy;

[0083] 2) Modular layout is adopted to facilitate product installation, layout, use and maintenance;

[0084] 3) Adopt high-efficiency, long-life, low exhaust resistance catalyst to ensure low exhaust resistance and product life;

[0085] 4) The encapsulation shell is made of SUS304 stainless steel, and the product manufacturing refers to the ship standard, with good anti-corrosion performance and long product life;

[0086] 5) Automatic injection system, which can adjust the injection volume in real time as the engine working conditions change, and the product has strong adaptability to working conditions;

[0087] 6) It can be equipped with an automatic urea filling device to improve the work efficiency of personnel.

[0088] The specific installation process of the exhaust gas aftertreatment arrangement and control system is as follows:

[0089] 1) The heater 1 is connected to the DOC / DPF device 2 through a pipeline; the DOC / DPF device 2 is connected to the differential pressure flowmeter 31 through a pipeline; the differential pressure flowmeter 31 is connected to the SCR device 3 through a pipeline; the SCR device 3 is connected to the first fan 41; the first fan 41 is connected to the second fan 42 through a pipeline; the second fan 42 is connected to the chimney 8 through a pipeline;

[0090] 2) The heater 1, the DOC / DPF device 2, the SCR device 3, and the first fan 41 are fixed on the first bracket 71; the first bracket 71 is fixed to the ground 9 and the first wall 10; the second fan 42 is fixed to the second bracket 72; the second bracket 72 is fixed to the first wall 10 and the second wall 20; the first travel switch 101 is installed beside the first bracket 71; the second travel switch 102 is installed below the second bracket 72; the first travel switch 101 and the second travel switch 102 are both connected to the PLC module 6;

[0091] 3) The first pressure sensor 21 and the first temperature sensor 22 are installed on the DOC / DPF device 2; the first nitrogen oxide sensor 32, the second pressure sensor 33, the second temperature sensor 34, the second nitrogen oxide sensor 35, the third pressure sensor 36, and the third temperature sensor 37 are installed on the SCR device 3 respectively;

[0092] 4) The urea tank assembly 5, the metering pump 53, and the post-processing control cabinet assembly 30 are all mounted on a third bracket located on one side of the first bracket 71; the outlet of the metering pump 53 is connected to the urea nozzle 51 through the urea supply pipeline 52;

[0093] 5) The motor wires of the first fan 41 and the second fan 42 are connected to the fan electrical cabinet 50; the heating pump wire of the heater 1 and the signal wire of the thermocouple 12 are connected to the heating electrical cabinet 40;

[0094] 6) The signal line of the first pressure sensor 21 and the signal line of the first temperature sensor 22 are respectively connected to the PLC module 6 and the post-processing control cabinet assembly 30; the signal line of the first nitrogen oxide sensor 32 and the signal line of the second pressure sensor 33; the signal line of the second temperature sensor 34, the signal line of the second nitrogen oxide sensor 35, the signal line of the third pressure sensor 36, and the signal line of the third temperature sensor 37 are respectively connected to the PLC module 6 and the post-processing control cabinet assembly 30; the heating electrical cabinet 40 and the fan electrical cabinet 50 are connected to the post-processing control cabinet assembly 30; the control signal line of the metering pump 53, the liquid level signal line and the temperature signal line on the urea solution tank 54 are respectively connected to the PLC module 6 and the post-processing control cabinet assembly 30; all signals on the post-processing control cabinet assembly 30 are transmitted to the PLC module 6.

[0095] To sum up, this embodiment provides an exhaust after-treatment arrangement and control system with low exhaust resistance, low maintenance cost, high efficiency, long life, strong adaptability to working conditions, small space, compact layout, safety and reliability, efficient response, long life, and high integration.

[0096] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Exhaust gas aftertreatment arrangement and control system, characterized in that: The invention comprises a heater (1), a DOC / DPF device (2), an SCR device (3), a fan assembly (4), a urea tank assembly (5), a PLC module (6) and a bracket assembly (7), wherein: The heater (1), the DOC / DPF device (2), and the SCR device (3) are respectively mounted on the bracket assembly (7); the heater (1) is provided with an exhaust gas inlet (11); the air outlet of the heater (1) is communicated with the air inlet of the DOC / DPF device (2); the air outlet of the DOC / DPF device (2) is communicated with the air inlet of the SCR device (3); and the air outlet of the SCR device (3) is communicated with the fan assembly (4); The air inlet of the DOC / DPF device (2) is provided with a first pressure sensor (21) and a first temperature sensor (22) which are signal-connected to the PLC module (6); A urea nozzle (51) and a differential pressure flowmeter (31) connected to the signal of the PLC module (6) are provided on the connecting pipe between the air outlet of the DOC / DPF device (2) and the air inlet of the SCR device (3); the urea tank assembly (5) is connected to the urea nozzle (51) via a urea supply pipeline (52); and a metering pump (53) connected to the signal of the PLC module (6) is provided on the urea supply pipeline (52); The air inlet of the SCR device (3) is provided with a first nitrogen oxide sensor (32), a second pressure sensor (33) and a second temperature sensor (34) which are signal-connected to the PLC module (6); The air outlet of the SCR device (3) is provided with a second nitrogen oxide sensor (35), a third pressure sensor (36) and a third temperature sensor (37) which are signal-connected to the PLC module (6).

2. The exhaust gas aftertreatment arrangement and control system according to claim 1, characterized in that: The fan assembly (4) comprises a first fan (41) and a second fan (42), wherein the first fan (41) is installed at the air outlet of the SCR device (3), the air outlet of the first fan (41) is connected to the air inlet of the second fan (42), and the air outlet of the second fan (42) is connected to the chimney (8).

3. The exhaust gas aftertreatment arrangement and control system according to claim 2, characterized in that: The support assembly (7) comprises a first support (71) and a second support (72), the first support (71) being fixed on the ground (9) and the first wall (10), the heater (1) and the DOC / DPF device (2) being connected and installed on the first layer of the first support (71), the SCR device (3) and the first fan (41) being connected and installed on the second layer of the first support (71), the urea tank assembly (5) being fixed on the ground (9) and located on one side of the first support (71), the second support (72) being suspended and fixed on the first wall (10), and the second fan (42) being installed on the second support (72).

4. The exhaust gas aftertreatment arrangement and control system according to claim 3, characterized in that: A first travel switch (101) for measuring the lateral displacement of the first bracket (71) and a second travel switch (102) for measuring the downward displacement of the second bracket (72) are arranged on the first wall surface (10); the first travel switch (101) and the second travel switch (102) are respectively connected to the PLC module (6) by signal.

5. The exhaust gas aftertreatment arrangement and control system according to claim 3, characterized in that: One end of the second bracket (72) is fixed on the first wall surface (10), and the other end of the second bracket (72) is fixed on a second wall surface (20) parallel to the first wall surface (10), and a walking passage is formed between the first bracket (71) and the second wall surface (20).

6. The exhaust gas aftertreatment arrangement and control system according to claim 1, characterized in that: The urea tank assembly (5) comprises a urea solution tank (54), on which a liquid level sensor and a liquid replenishing port are provided, and the liquid level sensor is signal-connected to the PLC module (6).

7. The exhaust gas aftertreatment arrangement and control system according to claim 1, characterized in that: The urea tank assembly (5) comprises a urea solution tank (54), on which a fourth temperature sensor and an electric heating component are arranged, and the fourth temperature sensor and the electric heating component are respectively connected to the PLC module (6) by signal.

8. The exhaust gas aftertreatment arrangement and control system according to claim 1, characterized in that: The metering pump (53) and / or the urea supply pipeline (52) are provided with an electric heating component, and the urea nozzle (51) is provided with a heat insulation cover.

9. The exhaust gas aftertreatment arrangement and control system according to claim 1, characterized in that: The DOC / DPF device (2) is provided with a maintenance port (23) for facilitating inspection and replacement of the catalyst.

10. The exhaust gas aftertreatment arrangement and control system according to claim 1, characterized in that: The invention also comprises a post-processing control cabinet assembly (30), a heating electrical cabinet (40) and a fan electrical cabinet (50); the air outlet of the heater (1) is provided with a thermocouple (12); the heater (1) and the thermocouple (12) are respectively connected to the heating electrical cabinet (40) by signal; the fan assembly (4) is connected to the fan electrical cabinet (50) by signal; the heating electrical cabinet (40) and the fan electrical cabinet (50) are respectively connected to the post-processing control cabinet assembly (30) by signal; and the post-processing control cabinet assembly (30) is connected to the PLC module (6) by signal.

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