Diesel engine test bed black smoke removing system with active regeneration function and diesel engine test bed

Abstract

The invention provides a diesel engine test bed black smoke removing system with an active regeneration function and a diesel engine test bed. The system mainly comprises a DFP main treatment section for treating the tail gas of the diesel engine, an air cleaning section for cleaning a DFP device of the DFP main treatment section, and a regeneration section for regenerating the DFP device. Flue gas in the starting stage of the diesel engine is introduced into the DPF device to be treated, the regeneration section is arranged, the working condition of frequent starting during diesel engine testing can be met, and maintenance is convenient and easy.

Description

Technical Field

[0001] The present application relates to the technical field of engine exhaust devices, and in particular to a black smoke removal system for a diesel engine test bench with active regeneration and a diesel engine test bench. Background Art

[0002] Currently, the main method for treating exhaust gas on diesel engine test benches is to use a Diesel Particulate Filter (DPF) installed on the main exhaust pipe to remove particulate matter. However, the current process is designed to treat the maximum 100% engine exhaust load, resulting in high operating costs and is not suitable for treating exhaust gas during the startup phase. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of this application is to provide a diesel engine test bench black smoke removal system with active regeneration and a diesel engine test bench, which are used to solve the problem that the existing exhaust gas treatment process is not suitable for treating exhaust gas during the startup phase.

[0004] To achieve the above-mentioned and other related objectives, the first aspect of the present application provides a black smoke removal system for a diesel engine test bench with active regeneration, comprising: a DFP main treatment section, an air purge section, and a regeneration section; wherein the DFP main treatment section is provided with a first pneumatic switch valve, a DFP device, and a second pneumatic switch valve in sequence; one end of the DFP main treatment section is provided with a diesel engine exhaust inlet, and the other end is provided with a diesel engine exhaust outlet; the first pneumatic switch valve and the second pneumatic switch valve are used to control the on / off of the DFP main treatment section; the DFP device is used to control the diesel engine exhaust entering from the diesel engine exhaust inlet. The air is processed and discharged through the diesel engine exhaust outlet; one end of the air scavenging section is connected to air, and the other end is connected to the DFP device; the air scavenging section is provided with a scavenging solenoid valve for controlling the on / off of air; the DFP device is also provided with a purge outlet; one end of the regeneration section is connected to air, and the other end is connected to a regeneration access point provided in the DFP main processing section; the regeneration access point is located between the first pneumatic switching valve and the DFP device; the regeneration section is configured to be activated when the operating pressure of the DFP device exceeds a set pressure threshold to regenerate the DFP device.

[0005] In some embodiments of the first aspect of the present application, the system further includes an auxiliary processing section; the auxiliary processing section is provided with a third pneumatic switching valve for controlling its on and off; one end of the auxiliary processing section is connected between the diesel engine exhaust inlet and the first pneumatic switching valve, and the other end is connected between the diesel engine exhaust outlet and the second pneumatic switching valve.

[0006] In some embodiments of the first aspect of the present application, the regeneration section is provided with an induced draft fan, a heater and a fourth pneumatic switch valve in sequence; wherein the induced draft fan is used to introduce air into the heater; the heater is used to heat the air; and the fourth pneumatic switch valve is used to control the on and off of the regeneration section.

[0007] In some embodiments of the first aspect of the present application, the DFP main processing section is further provided with a pressure sensor for collecting pressure difference data between the inlet and outlet of the DFP device.

[0008] In some embodiments of the first aspect of the present application, a flow meter is further provided on the DFP main processing section; wherein the flow meter is provided between the first pneumatic switching valve and the regeneration access point; and the operating pressure of the DFP device is calculated based on flow data collected by the flow meter and pressure differential data of the DFP device collected by the pressure sensor.

[0009] In some embodiments of the first aspect of the present application, a flame arrester is further provided on the DFP main processing section.

[0010] In some embodiments of the first aspect of the present application, there are two flame arresters; one flame arrester is located between the regeneration access point and the inlet of the DFP device, and the other flame arrester is located between the outlet of the DFP device and the second pneumatic switching valve.

[0011] In some embodiments of the first aspect of the present application, a temperature sensor is provided at the inlet of the DFP device; the temperature sensor is used to determine the operating power of the heater.

[0012] In some embodiments of the first aspect of the present application, a purge structure is provided in the DFP device; wherein the purge structure is connected to the other end of the air purge section and is used to purge the DFP device.

[0013] To achieve the above-mentioned object and other related objects, a second aspect of the present application provides a diesel engine test bench, comprising: the diesel engine test bench black smoke removal system with active regeneration as described above.

[0014] As described above, the diesel engine test bench black smoke removal system with active regeneration and the diesel engine test bench of the present application have the following beneficial effects:

[0015] This application introduces the flue gas during the diesel engine startup phase into the DPF device for treatment and configures a regeneration section, which can meet the working conditions of frequent startup during diesel engine testing and is convenient and simple to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1Shown is a schematic diagram of a black smoke removal system for a diesel engine test bench with active regeneration in one embodiment of the present application.

[0017] Figure 2 Shown is a structural schematic diagram of the regeneration section in one embodiment of the present application. DETAILED DESCRIPTION

[0018] The following describes the embodiments of the present application through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0019] In the embodiments of this application, terms such as "first" and "second" are used to distinguish between identical or similar items with substantially the same function or effect. For example, the terms "first" and "second" are used solely to distinguish between different pneumatic switch valves and do not define their order. Those skilled in the art will understand that terms such as "first" and "second" do not define the quantity or order of execution, and do not necessarily define differences between the terms.

[0020] It should be noted that in the embodiments of this application, words such as "exemplary" or "for example" represent examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0021] In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can represent: a, b, c, ab, ac, bc or abc, where a, b, c can be single or multiple.

[0022] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0023] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," "fixed," and "holding" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0024] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, or operations is inherently mutually exclusive in some way.

[0025] Figure 1 as well as Figure 2 This is a structural diagram of a diesel engine test bench black smoke removal system with active regeneration and a diesel engine test bench provided in an embodiment of the present application. Figure 1 As shown, the black smoke removal system of the diesel engine test bench with active regeneration includes:

[0026] DFP main treatment section 1, air purge section 2 and regeneration section 3;

[0027] The DFP main processing section 1 is provided with a first pneumatic on-off valve 11, a DFP device 12, and a second pneumatic on-off valve 13 in sequence. A diesel exhaust inlet is provided at one end of the DFP main processing section 1, and a diesel exhaust outlet is provided at the other end. The first pneumatic on-off valve 11 and the second pneumatic on-off valve 13 are used to control the on / off of the DFP main processing section 1. The DFP device 12 is used to treat the diesel exhaust entering from the diesel exhaust inlet and discharge the treated exhaust through the diesel exhaust outlet.

[0028] One end of the air cleaning section 2 is connected to the air, and the other end is connected to the DFP device 12; the air cleaning section 2 is provided with a cleaning solenoid valve 21 for controlling the on and off of the air; the DFP device 12 is also provided with a purge outlet 121;

[0029] One end of the regeneration section 3 is connected to air, and the other end is connected to a regeneration access point A located in the DFP main processing section 1. The regeneration access point A is located between the first pneumatic on / off valve 11 and the DFP device 12. The regeneration section 3 is configured to activate when the operating pressure of the DFP device 12 exceeds a set pressure threshold to regenerate the DFP device 12.

[0030] In one embodiment, if Figure 1 as well as Figure 2 As shown, the black smoke removal system of the diesel engine test bench with active regeneration also includes an auxiliary treatment section 4; the auxiliary treatment section 4 is provided with a third pneumatic switch valve 41 for controlling the on and off of the auxiliary treatment section 4; one end of the auxiliary treatment section 4 is connected between the diesel engine exhaust inlet and the first pneumatic switch valve 11, and the other end is connected between the diesel engine exhaust outlet and the second pneumatic switch valve 13.

[0031] In one embodiment, if Figure 2 As shown, the regeneration section 3 is provided with an induced draft fan 31, a heater 32 and a fourth pneumatic switch valve 33 in sequence; wherein, the induced draft fan 31 is used to introduce air into the heater 32; the heater 32 is used to heat the air; and the fourth pneumatic switch valve 33 is used to control the on and off of the regeneration section 3.

[0032] In one embodiment, if Figure 2 As shown, a purge structure 122 is provided in the DFP device 12 ; wherein the purge structure 122 is connected to the other end of the air purge section 2 for purging the DFP device 12 .

[0033] In a specific embodiment, the purge structure includes a blow pipe disposed upstream of the air flow in the DPF device, and the blow pipe is connected to the other end of the air purge section.

[0034] The following will be combined with the attached Figure 1 And attached Figure 2 Explain the system operation process:

[0035] Before the diesel engine starts, the first and second pneumatic on / off valves 11 and 13 are opened, while the third and fourth pneumatic on / off valves 41 and 33 are closed. After the diesel engine starts, diesel exhaust enters the DFP device 12 through the diesel exhaust inlet. The DFP device 12 captures particulate matter in the diesel exhaust, and the treated exhaust (flue gas) is discharged through the diesel exhaust outlet.

[0036] When the operating load of the diesel engine is above 5%, the third pneumatic switch valve 41 is opened, and the first pneumatic switch valve 11, the second pneumatic switch valve 13 and the fourth pneumatic switch valve 33 are closed, and the diesel engine exhaust is discharged directly from the diesel engine exhaust outlet without passing through the DFP device 12.

[0037] After each operation of the DFP device 12 is completed, the cleaning solenoid valve 21 is opened to control air to enter the blowing structure 122, and the blowing structure 122 purges the DFP device 12. The dust purged is blown out from the purge outlet 121 and collected by the collection device.

[0038] In one embodiment, if Figure 2 As shown, the DFP main processing section 1 is further provided with a pressure sensor 14 for collecting pressure difference data between the inlet and outlet of the DFP device 12 .

[0039] In one embodiment, if Figure 2 As shown, the DFP main processing section 1 is further provided with a flow meter 15 ; the flow meter 15 is provided between the first pneumatic on / off valve 11 and the regeneration access point A; the operating pressure of the DFP device 12 is calculated based on the flow data collected by the flow meter 15 and the pressure difference data of the DFP device 12 collected by the pressure sensor 14 .

[0040] Specifically, based on the pipeline gas flow data (generally volume flow) of the DFP main processing section collected by the flow meter and the pipeline radius of the DFP main processing section, the flow velocity data is calculated using the flow velocity calculation formula (flow velocity = flow rate / flow cross-sectional area); wherein, the flow cross-sectional area is calculated based on the pipeline radius of the DFP main processing section; based on the flow velocity data and the pressure difference data, the operating pressure of the DFP device is calculated (operating pressure = pressure difference × flow velocity 2 ).

[0041] The following will be combined with the attached Figure 2 Explanation of the regeneration process:

[0042] When the operating pressure of the DFP unit 12 exceeds a set pressure threshold (the pressure threshold can be set to 4 kPa at a pipeline flow rate of 15 m / s), the DFP unit 12 needs to be regenerated. The fourth pneumatic on / off valve 33 is opened, and the induced draft fan 31 draws air into the heater 32, where it is heated and then fed into the DFP unit 12. A temperature sensor 16 is provided at the inlet of the DFP unit 12. The temperature detected by the temperature sensor 16 determines the operating power of the heater 32. The temperature at the inlet of the DFP unit 12 is typically controlled at 600°C. The entire regeneration process typically lasts 5 to 6 hours.

[0043] Determining the operating power of the heater 32 based on the temperature at the inlet of the DFP device 12 detected by the temperature sensor 16 includes: determining the effective power required for heating the gas based on the temperature at the inlet of the DFP device 12 detected by the temperature sensor 16 using an effective power calculation formula; wherein the effective power calculation formula is: P 有效 =m×C×(T out -T in );P 有效 is the effective power, m is the gas mass flow rate, C is the gas constant pressure specific heat capacity, T out The temperature detected by the temperature sensor, T in is the initial temperature of the input air; based on the heater efficiency, the operating power of the heater 32 is calculated using the power calculation formula; wherein, P 实际 is the operating power of the heater and η is the heater efficiency.

[0044] It should be noted that the present invention introduces the flue gas during the diesel engine startup phase into the DPF device for treatment and is equipped with a regeneration section, which can meet the working conditions of frequent startup during diesel engine testing and is convenient and simple to maintain.

[0045] In one embodiment, if Figure 2 As shown, the DFP main processing section 1 is also equipped with a flame arrester 17. There are two flame arresters 17, one located between the regeneration access point A and the inlet of the DFP device 12, and the other located between the outlet of the DFP device 12 and the second pneumatic on / off valve 13. The flame arresters 17 are used to prevent combustion of the equipment due to high temperatures during the regeneration process, which could affect other equipment.

[0046] Similar to the above-described embodiment, the present invention also provides a diesel engine test bench including the above-described diesel engine test bench black smoke removal system with active regeneration. It should be noted that the specific structure of the diesel engine test bench black smoke removal system with active regeneration has been described in the above-described embodiment and will not be repeated here.

[0047] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0048] In summary, this application provides a diesel engine test bench black smoke removal system with active regeneration and a diesel engine test bench. The system primarily comprises a DPF main treatment section for treating diesel engine exhaust, an air scavenging section for purging the DPF unit within the DFP main treatment section, and a regeneration section for regenerating the DFP unit. By directing exhaust gas from the diesel engine startup phase into the DPF unit for treatment and incorporating a regeneration section, this system can accommodate the frequent startups required during diesel engine testing and offers simplified maintenance. Therefore, this application effectively overcomes numerous shortcomings of the prior art and possesses high industrial value.

[0049] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A black smoke removal system for a diesel engine test bench with active regeneration, characterized in that: include: DFP main treatment section, air purge section and regeneration section; The DFP main processing section is sequentially provided with a first pneumatic switch valve, a DFP device, and a second pneumatic switch valve; one end of the DFP main processing section is provided with a diesel exhaust inlet, and the other end is provided with a diesel exhaust outlet; the first and second pneumatic switch valves are used to control the on / off of the DFP main processing section; the DFP device is used to treat the diesel exhaust entering from the diesel exhaust inlet and discharge it through the diesel exhaust outlet; One end of the air cleaning section is connected to the air, and the other end is connected to the DFP device; the air cleaning section is provided with a cleaning solenoid valve for controlling the on and off of the air; the DFP device is also provided with a purge outlet; One end of the regeneration section is connected to air, and the other end is connected to a regeneration access point provided in the DFP main processing section; the regeneration access point is located between the first pneumatic switching valve and the DFP device; the regeneration section is configured to be activated when the operating pressure of the DFP device exceeds a set pressure threshold to regenerate the DFP device.

2. The black smoke removal system for a diesel engine test bench with active regeneration according to claim 1 is characterized in that: The system also includes an auxiliary processing section; the auxiliary processing section is provided with a third pneumatic switch valve for controlling its on and off; one end of the auxiliary processing section is connected between the diesel engine exhaust inlet and the first pneumatic switch valve, and the other end is connected between the diesel engine exhaust outlet and the second pneumatic switch valve.

3. The black smoke removal system for a diesel engine test bench with active regeneration according to claim 1 is characterized in that: The regeneration section is provided with an induced draft fan, a heater and a fourth pneumatic switch valve in sequence; wherein, the induced draft fan is used to introduce air into the heater; the heater is used to heat the air; and the fourth pneumatic switch valve is used to control the on and off of the regeneration section.

4. The black smoke removal system for a diesel engine test bench with active regeneration according to claim 1 is characterized in that: The DFP main processing section is also provided with a pressure sensor for collecting pressure difference data between the inlet and outlet of the DFP device.

5. The black smoke removal system for a diesel engine test bench with active regeneration according to claim 4 is characterized in that: The DFP main processing section is further provided with a flow meter, wherein the flow meter is provided between the first pneumatic switch valve and the regeneration access point. The operating pressure of the DFP device is calculated based on flow data collected by the flow meter and pressure difference data of the DFP device collected by the pressure sensor.

6. The black smoke removal system for a diesel engine test bench with active regeneration according to claim 5, characterized in that: The DFP main processing section is also provided with a flame arrester.

7. The black smoke removal system for a diesel engine test bench with active regeneration according to claim 6, characterized in that: There are two flame arresters; one flame arrester is provided between the regeneration access point and the inlet of the DFP device, and the other flame arrester is provided between the outlet of the DFP device and the second pneumatic switch valve.

8. The black smoke removal system for a diesel engine test bench with active regeneration according to claim 3 is characterized in that: A temperature sensor is provided at the inlet of the DFP device; the temperature sensor is used to determine the operating power of the heater.

9. The black smoke removal system for a diesel engine test bench with active regeneration according to claim 1, characterized in that: A purge structure is provided in the DFP device, wherein the purge structure is connected to the other end of the air purge section and is used to purge the DFP device.

10. A diesel engine test bench, characterized in that: include: A black smoke removal system for a diesel engine test bench with active regeneration according to any one of claims 1 to 9.

Images