CN216342391U - Tail gas post-treatment device for non-road diesel engine by using liquid ammonia as SDPF reducing agent - Google Patents
Tail gas post-treatment device for non-road diesel engine by using liquid ammonia as SDPF reducing agent Download PDFInfo
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- CN216342391U CN216342391U CN202220021036.8U CN202220021036U CN216342391U CN 216342391 U CN216342391 U CN 216342391U CN 202220021036 U CN202220021036 U CN 202220021036U CN 216342391 U CN216342391 U CN 216342391U
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Abstract
The tail gas post-treatment device for the non-road diesel engine by using liquid ammonia as an SDPF reducing agent comprises a post-vortex tail gas post-treatment system, a liquid ammonia gasification and metering injection system and a non-road diesel engine control system, wherein the post-vortex tail gas post-treatment system comprises an exhaust connecting pipe and an exhaust tail pipe, a DOC device, an ammonia mixer and an SDPF device are sequentially connected between the exhaust connecting pipe and the exhaust tail pipe along a tail gas discharge direction, a nitrogen-oxygen sensor, a temperature discharge sensor and a differential pressure sensor are further arranged on a pipeline of the post-vortex tail gas post-treatment system, and two ends of the differential pressure sensor are respectively connected with two ends of the SDPF device; an ammonia gas injection connecting pipe of the liquid ammonia gasification and metering injection system is connected with an ammonia gas mixer to provide ammonia gas for the post-treatment system of the tail gas after the vortex; the non-road diesel engine control system is in signal connection with each sensor. The device can effectively solve the problem that the urea pyrolysis process is complex and difficult to control, improve the transient emission control precision and reduce the use cost of users.
Description
Technical Field
The utility model belongs to the technical field of emission control of non-road diesel engines, and particularly relates to a tail gas post-treatment device for a non-road diesel engine, which utilizes liquid ammonia as an SDPF reducing agent.
Background
In order to meet the requirements of the fourth and higher non-road emission regulations on nitrogen oxides, Particulate matter amount and the like in the exhaust gas of the Diesel engine, the currently mainstream technical route is that an EGR valve is connected in front of a turbine of a turbocharger, and an aftertreatment device is connected behind the turbine, wherein the aftertreatment device mainly comprises a DOC (Oxidation catalytic converter), a DPF (Particulate Filter), an SCR (Selective catalytic Reduction) and an ASC (Ammonia Slip Catalyst) for treating the exhaust gas so as to discharge cleaner exhaust gas into the atmosphere, thereby effectively reducing the influence of the non-road exhaust gas of the Diesel engine on the environment.
At present, the selective catalytic reduction technology using 32.5% urea solution is widely used for reducing NOx emission of off-road diesel engine, and its basic principle is that the urea solution stored in the urea tank is sprayed and atomized under the action of the urea pump and urea nozzle, and then hydrolyzed and pyrolyzed to generate ammonia gas, and the ammonia gas converts nitrogen oxide into nitrogen gas and water under the action of the catalyst. The reaction of the urea aqueous solution in the process of producing ammonia by hydrolysis is complex, and the transient process is difficult to control accurately; and simultaneously, the problems of low NOx conversion rate, poor activity at low temperature, coking caused by incomplete decomposition, crystallization, low content of effective ammonia and the like are also faced.
Currently, the most common diesel aftertreatment systems are used by combining DOC, DPF, SCR, ASC in series. However, this method also causes problems of the series combination, such as large volume, high requirement for piping arrangement, and poor low-temperature ignition performance of SCR. Therefore, a particulate trap (SDPF) coated with an SCR catalyst was created, i.e., the SCR catalyst was coated directly on the DPF.
The SDPF technology shortens the distance of pipeline arrangement and can also obviously improve the ignition speed of the SDPF. However, the structure shortens the urea mixing pipeline, is not favorable for uniform distribution of NH3 in the exhaust pipe after urea decomposition, has limited capability of the urea pump and the urea nozzle, and cannot ensure the mixing effectThe requirement of reaction efficiency is met, and if the mixing is not uniform, the discharge standard cannot be met. Meanwhile, the SCR catalyst in the existing SDPF system is used for NO2Resulting in NO that would otherwise be available for passive regeneration of the DPF2Is reduced by SCR. Therefore, the passive regeneration temperature of the DPF is high, the efficiency of the DPF is low, active regeneration can be generally adopted, the oil consumption is increased, the regeneration period of the DPF is reduced, more NH3 is consumed to reduce NO2, the urea consumption is increased, and the emission reduction cost is increased.
Therefore, how to solve the problems that the urea pyrolysis process is complex and difficult to control and the SCR catalyst in the SDPF system is used for NO in the prior art2The problems of contention and the like are very important for improving the transient emission control precision and reducing the use cost of users.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a tail gas post-treatment device for a non-road diesel engine, which uses liquid ammonia as an SDPF reducing agent and adopts a catalyst coated in a sectional and a zoned manner.
In order to achieve the purpose, the utility model adopts the technical scheme that: the tail gas post-treatment device for the non-road diesel engine by using liquid ammonia as an SDPF reducing agent comprises a post-vortex tail gas post-treatment system, a liquid ammonia gasification and metering injection system and a non-road diesel engine control system, wherein the post-vortex tail gas post-treatment system comprises an exhaust connecting pipe and an exhaust tail pipe, a DOC device, an ammonia mixer and an SDPF device are sequentially connected between the exhaust connecting pipe and the exhaust tail pipe along a tail gas discharge direction, a nitrogen-oxygen sensor, a temperature discharge sensor and a differential pressure sensor are further arranged on a pipeline of the post-vortex tail gas post-treatment system, and two ends of the differential pressure sensor are respectively connected with two ends of the SDPF device; an ammonia gas injection connecting pipe of the liquid ammonia gasification and metering injection system is connected with an ammonia gas mixer to provide ammonia gas for the post-treatment system of the tail gas after the vortex; the non-road diesel engine control system is in signal connection with each sensor.
In the post-treatment system for the post-vortex tail gas, the nitrogen-oxygen sensors comprise two nitrogen-oxygen sensors, namely a first nitrogen-oxygen sensor and a second nitrogen-oxygen sensor, wherein the first nitrogen-oxygen sensor is arranged at the inlet of the exhaust connecting pipe and is positioned at the upstream of the ammonia gas mixer, and the second nitrogen-oxygen sensor is arranged on the exhaust tail pipe at the downstream of the differential pressure sensor; the exhaust temperature sensor comprises three first exhaust temperature sensors, second exhaust temperature sensors and third exhaust temperature sensors, the first exhaust temperature sensors are arranged on the exhaust connecting pipe, the second exhaust temperature sensors are arranged between the ammonia mixer and the SDPF device, and the third exhaust temperature sensors are arranged on the exhaust tail pipe.
And the tail pipe is also provided with a PM sensor.
The liquid ammonia gasification and metering injection system comprises a liquid ammonia container, a liquid ammonia metering valve, a liquid ammonia gasification device, an ammonia metering injection device and an ammonia injection connecting pipe which are connected in sequence.
The liquid ammonia container is provided with a liquid ammonia liquid level sensor and a liquid ammonia pressure sensor which are connected with a non-road diesel engine controller signal of the non-road diesel engine control system.
And a liquid ammonia ball valve is arranged on a pipeline between the liquid ammonia container and the liquid ammonia metering valve, and the liquid ammonia ball valve and the liquid ammonia metering valve are in signal connection with a non-road diesel engine controller of the non-road diesel engine control system.
Liquid ammonia gasification device installs liquid ammonia gasification inlet tube, liquid ammonia gasification wet return, is equipped with liquid ammonia gasification solenoid valve on the liquid ammonia gasification inlet tube, liquid ammonia gasification solenoid valve and non-road diesel engine control system's non-road diesel engine controller signal connection.
And the ammonia gas metering and injecting device is provided with an ammonia gas pressure sensor and an ammonia gas injecting electromagnetic valve which are both in signal connection with a non-road diesel engine controller of a non-road diesel engine control system.
And an ammonia gas purification device and an ammonia gas pressure stabilizing device are sequentially arranged between the liquid ammonia gasification device and the ammonia gas metering injection device.
The SDPF device comprises a plurality of SDPF units, each SDPF unit is provided with an air inlet channel and an air outlet channel, the inner surface of the air inlet channel is coated with DPF passive regeneration catalyst, the inner surface of the air outlet channel is coated with SCR catalyst and ASC catalyst, and the ASC catalyst is coated on the surface of the SCR catalyst layer at the tail end of the air outlet channel.
The tail gas post-treatment device for the non-road diesel engine by using the liquid ammonia as the SDPF reducing agent has the advantages of reasonable design, compact structure, convenient assembly and disassembly, strong universality, low cost and small occupied space of the system, and has the following advantages:
(1) the sensor used on the post-treatment system of the tail gas after the vortex is favorable for improving the control precision of the transient process of the oxynitride, ensuring the safety of the regeneration process of the SDPF device and simultaneously meeting the requirement of improving the accuracy of fault diagnosis; on the other hand, the PM sensor and the second nitrogen oxide sensor at the tail end of the tail gas aftertreatment system can provide data for the vehicle-mounted terminal, and the requirements of remote online supervision are met.
(2) The liquid ammonia gasification and metering injection system is utilized to directly control the injection amount of ammonia, so that the conversion efficiency of the SCR post-treatment system can be improved, and a series of problems of low-temperature crystallization, slow and uncontrollable urea pyrolysis process, system part failure and the like in the system by utilizing urea as a reducing agent can be solved.
(3) Compared with the traditional serial CDPF + SCR + ASC device, the SDPF device using the facet zone coating is combined with the SCR and the ASC into the same carrier, so that the use of the original SCR and ASC straight-through carrier is eliminated, the cost of the product is reduced and the volume of the system is smaller under the condition of improving the product performance. In addition, the average temperature of the SDPF carrier is higher, the conversion efficiency of the oxynitride under the conditions of cold start and low exhaust temperature can be improved, and the comprehensive conversion efficiency of the oxynitride can be improved. On the other hand, the ASC catalyst is added on the basis of the SCR catalyst, so that the problem of ammonia gas leakage is solved while higher conversion efficiency is realized.
Drawings
Fig. 1 is a schematic diagram of the main system structure of the present invention.
Fig. 2 is a schematic diagram of the specific structure of each system of the present invention.
Figure 3 is a schematic view of a SDPF unit of the present invention coated with a catalyst in a zoned, zoned fashion.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the utility model is not limited thereto.
Referring to the attached drawings, the tail gas post-treatment device for the non-road diesel engine by using liquid ammonia as an SDPF reducing agent mainly comprises three systems: the system comprises a post-vortex tail gas aftertreatment system S10, a liquid ammonia gasification and metering injection system S20 and a non-road diesel engine control system S30. The post-vortex tail gas post-treatment system S10 is mainly responsible for treating tail gas, the liquid ammonia gasification and metering injection system S20 is mainly responsible for providing ammonia gas required by tail gas treatment for the post-vortex tail gas post-treatment system S10, and the off-road diesel engine control system S30 is mainly used for being in signal connection with the post-vortex tail gas post-treatment system S10 and the liquid ammonia gasification and metering injection system S20.
The structural components of the respective systems will be described in detail below.
As shown in fig. 2, the post-vortex exhaust gas aftertreatment system S10 includes an exhaust connection pipe 11, a first nox sensor 10, a first exhaust temperature sensor 9, a DOC device 8, an ammonia mixer 7, a second exhaust temperature sensor 6, an SDPF device 5, a differential pressure sensor 4, a PM sensor 3, a second nox sensor 2, a third exhaust temperature sensor 1, and a tail pipe 0. The exhaust connecting pipe 11 is used as an exhaust inlet pipe of tail gas and is connected with one end of the DOC device 8, the other end of the DOC device 8 is connected with an upstream port of the ammonia mixer 7, a downstream port of the ammonia mixer 7 is connected with an inlet of the SDPF device 5, an outlet of the SDPF device 5 is connected with the exhaust tail pipe 0, and the exhaust tail pipe 0 is used as a treated tail gas exhaust pipe. A first nitrogen oxygen sensor 10 and a first exhaust temperature sensor 9 are sequentially arranged on an exhaust connecting pipe 11, a second exhaust temperature sensor 6 is arranged between an ammonia gas mixer 7 and an SDPF device 5, differential pressure sensors 4 are arranged at two ends of an inlet and an outlet of the SDPF device 5, and a PM sensor 3, a second nitrogen oxygen sensor 2 and a third exhaust temperature sensor 1 are arranged on an exhaust tail pipe. The first nitrogen-oxygen sensor 10, the first exhaust temperature sensor 9, the second exhaust temperature sensor 6, the differential pressure sensor 4, the PM sensor 3 and the second nitrogen-oxygen sensor 2 are in signal connection with an off-road diesel engine control system S30.
The first nitrogen oxide sensor 10 is used for collecting the concentration of nitrogen oxide at the front end of the DOC device 8 as the input quantity of feedforward control of the SCR control strategy, and the second nitrogen oxide sensor 2 is used for collecting the concentration of nitrogen oxide at the rear end of the SDPF device 5 as the input quantity of feedback control of the SCR control strategy, so that the transient control precision of the SCR control strategy is improved; meanwhile, the conversion efficiency of the nitrogen oxide of the SDPF device 5 is calculated in real time according to the concentration of the nitrogen oxide collected by the first nitrogen oxide sensor 10 and the second nitrogen oxide sensor 2, so that the possible fault type of the SDPF device 5 can be predicted early and accurately; meanwhile, the concentration value of nitrogen oxide at the front end of the DOC device 8, acquired by the first nitrogen oxide sensor 10, can be used as an output value of an SCR (selective catalytic reduction) upstream NOx sensor acquired by a vehicle-mounted terminal and is uploaded to a remote service and management platform in real time. The concentration of the oxynitride at the rear end of the SDPF device 5 acquired by the second oxynitride sensor 2 can be used as an output value of the SCR downstream NOx sensor acquired by the vehicle-mounted terminal and uploaded to a remote service and management platform in real time.
The second exhaust temperature sensor 6 is used for collecting the inlet temperature of the SDPF device 5, the third exhaust temperature sensor 1 is used for collecting the outlet temperature of the SDPF device 5, and the average temperature of the SDPF device 5 is calculated, so that the improvement of the calculation accuracy of ammonia gas required in the SCR control strategy is facilitated, and the control accuracy of the transient process is further improved.
The DOC device 8 inlet temperature is collected by the first exhaust temperature sensor 9, the SDPF device 5 inlet temperature is collected by the second exhaust temperature sensor 6 to be used as the input quantity of the feedforward control of the DPF regeneration control strategy, and the SDPF device 5 outlet temperature is collected by the third exhaust temperature sensor 1 to be used as the input quantity of the feedback control of the DPF regeneration control strategy, so that the safety of the DPF regeneration process is improved.
The PM sensor 3 is used for collecting a concentration value of PM at an outlet of the SDPF device 5, and the concentration value is used as a judgment basis for judging whether a fracture fault occurs inside the SDPF carrier.
Figure 3 shows a schematic of a SDPF unit with a zoned catalyst coating. The SDPF device 5 includes a plurality of SDPF units, each SDPF unit is provided with an inlet passage 5a and an outlet passage 5e, the inner surface of the inlet passage 5a is coated with a DPF passive regeneration catalyst 5b, the inner surface of the outlet passage 5e is coated with an SCR catalyst 5c and an ASC catalyst 5d, and the ASC catalyst is coated on the SCR catalyst layer surface at the end of the outlet passage.
The engine exhaust gas containing soot and ash firstly enters the air inlet channel 5a of the SDPF device 5, the soot and ash with larger grain size are left in the air inlet channel 5a under the action of the filter material of the SDPF device 5, and the passive regeneration process is continuously carried out under the action of the DPF passive regeneration catalyst 5 b. Then, the exhaust gas enters the gas outlet channel 5b, and nitrogen oxides in the exhaust gas are reduced under the action of the SCR catalyst 5c, while the remaining ammonia gas in the exhaust gas is oxidized under the action of the ASC catalyst 5 d.
With continued reference to fig. 2, the liquid ammonia vaporizing and metered injection system S20 includes a liquid ammonia container, a liquid ammonia metering valve 16, a liquid ammonia vaporizing device 17, an ammonia gas purifying device 21, an ammonia gas pressure stabilizing device 22, an ammonia gas metered injection device 23, and an ammonia gas injection connecting pipe 26, which are connected in series. A liquid ammonia container adopts a liquid ammonia steel cylinder 12 for storing liquid ammonia, and a liquid ammonia liquid level sensor 13 and a liquid ammonia pressure sensor 14 are arranged on the liquid ammonia steel cylinder 12 for measuring the content of the liquid ammonia in the liquid ammonia steel cylinder 12; a liquid ammonia ball valve 15 is arranged between the liquid ammonia steel cylinder 12 and the liquid ammonia metering valve 16, the liquid ammonia ball valve 15 is an electromagnetic valve, a pipeline can be kept closed under the condition of power failure, the liquid ammonia ball valve 15 can be manually opened or closed under the emergency condition, and a liquid ammonia gasification channel is opened or closed under the normal condition; a liquid ammonia metering valve 16 is used to regulate the flow of liquid ammonia to be vaporized. The liquid ammonia gasification device 17 is provided with a liquid ammonia gasification inlet pipe 18 and a liquid ammonia gasification return pipe 19, and the engine circulating water is used for gasifying the liquid ammonia through the liquid ammonia gasification inlet pipe 18 and the liquid ammonia gasification return pipe 19, and the flow of the engine circulating water is controlled by a liquid ammonia gasification electromagnetic valve 20 arranged on the liquid ammonia gasification inlet pipe 18. The ammonia gas purification device 21 is used for adsorbing impurities in gasified ammonia gas, and the ammonia gas pressure stabilizing device 22 is used for stabilizing the pressure of ammonia gas entering the ammonia gas metering and injecting device 23. The ammonia gas metering and injecting device 23 is provided with an ammonia gas pressure sensor 24 and an ammonia gas injection electromagnetic valve 25 for accurately controlling the injection amount of ammonia gas. One end of the ammonia gas injection connecting pipe 26 is connected with the ammonia gas metering and injecting device 23, the other end is connected with the ammonia gas mixer 7, and the injected ammonia gas and the engine tail gas can be fully mixed in the ammonia gas mixer 7.
In the liquid ammonia gasification and metering injection system S20, a liquid ammonia liquid level sensor 13, a liquid ammonia pressure sensor 14, a liquid ammonia ball valve 15, a liquid ammonia metering valve 16, a liquid ammonia gasification solenoid valve 20, an ammonia pressure sensor 24, and an ammonia injection solenoid valve 25 are in signal connection with a non-road diesel engine control system S30. The controller in the off-road diesel engine control system S30 dynamically adjusts the opening of the liquid ammonia metering valve 16 according to the required ammonia injection amount calculated by the SCR control strategy, adjusts the liquid ammonia flow rate, and then controls the opening of the ammonia injection solenoid valve 25 according to the feedback of the ammonia pressure sensor 24, thereby accurately controlling the ammonia injection amount.
With continued reference to fig. 2, the off-road diesel engine control system S30 includes an off-road diesel engine controller 27, an engine and aftertreatment harness 28, and is connected to the post-turbine exhaust aftertreatment system S10 and associated equipment in the liquid ammonia gasification and dosing injection system S20 via the engine and aftertreatment harness 28. Specifically, the off-road diesel engine controller 27 is connected with the first nitrogen-oxygen sensor 10, the first exhaust temperature sensor 9, the second exhaust temperature sensor 6, the differential pressure sensor 4, the PM sensor 3, the second nitrogen-oxygen sensor 2, the liquid ammonia level sensor 13, the liquid ammonia pressure sensor 14, the liquid ammonia ball valve 15, the liquid ammonia metering valve 16, the liquid ammonia gasification solenoid valve 20, the ammonia pressure sensor 24, and the ammonia injection solenoid valve 25 through an engine and a post-treatment wire harness 28. The non-road diesel engine controller 27 simultaneously controls the working processes of the non-road diesel engine, the post-vortex tail gas aftertreatment system S10 and the liquid ammonia gasification and metering injection system S20.
The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and it should be understood by those of ordinary skill in the art that the specific embodiments of the present invention can be modified or substituted with equivalents with reference to the above embodiments, and any modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims to be appended.
Claims (10)
1. Utilize liquid ammonia to be tail gas aftertreatment device for non-road diesel engine of SDPF reductant, its characterized in that: the device comprises a post-vortex tail gas post-treatment system, a liquid ammonia gasification and metering injection system and a non-road diesel engine control system, wherein the post-vortex tail gas post-treatment system comprises an exhaust connecting pipe and an exhaust tail pipe, a DOC device, an ammonia mixer and an SDPF device are sequentially connected between the exhaust connecting pipe and the exhaust tail pipe along the tail gas discharge direction, a nitrogen-oxygen sensor, a heat discharge sensor and a differential pressure sensor are further arranged on a pipeline of the post-vortex tail gas post-treatment system, and two ends of the differential pressure sensor are respectively connected with two ends of the SDPF device; an ammonia gas injection connecting pipe of the liquid ammonia gasification and metering injection system is connected with an ammonia gas mixer to provide ammonia gas for the post-treatment system of the tail gas after the vortex; the non-road diesel engine control system is in signal connection with each sensor.
2. The exhaust gas after-treatment device for the off-road diesel engine using liquid ammonia as the SDPF reducing agent according to claim 1, wherein: in the post-treatment system for the post-vortex tail gas, the nitrogen-oxygen sensors comprise two nitrogen-oxygen sensors, namely a first nitrogen-oxygen sensor and a second nitrogen-oxygen sensor, wherein the first nitrogen-oxygen sensor is arranged at the inlet of the exhaust connecting pipe and is positioned at the upstream of the ammonia gas mixer, and the second nitrogen-oxygen sensor is arranged on the exhaust tail pipe at the downstream of the differential pressure sensor; the exhaust temperature sensor comprises three first exhaust temperature sensors, second exhaust temperature sensors and third exhaust temperature sensors, the first exhaust temperature sensors are arranged on the exhaust connecting pipe, the second exhaust temperature sensors are arranged between the ammonia mixer and the SDPF device, and the third exhaust temperature sensors are arranged on the exhaust tail pipe.
3. The exhaust gas after-treatment device for the off-road diesel engine using liquid ammonia as the SDPF reducing agent according to claim 2, wherein: and the tail pipe is also provided with a PM sensor.
4. The exhaust gas after-treatment device for the off-road diesel engine using liquid ammonia as the SDPF reducing agent according to claim 1, wherein: the liquid ammonia gasification and metering injection system comprises a liquid ammonia container, a liquid ammonia metering valve, a liquid ammonia gasification device, an ammonia metering injection device and an ammonia injection connecting pipe which are connected in sequence.
5. The exhaust gas after-treatment device for the off-road diesel engine using liquid ammonia as the SDPF reducing agent according to claim 4, wherein: the liquid ammonia container is provided with a liquid ammonia liquid level sensor and a liquid ammonia pressure sensor which are connected with a non-road diesel engine controller signal of the non-road diesel engine control system.
6. The exhaust gas after-treatment device for the off-road diesel engine using liquid ammonia as the SDPF reducing agent according to claim 4, wherein: and a liquid ammonia ball valve is arranged on a pipeline between the liquid ammonia container and the liquid ammonia metering valve, and the liquid ammonia ball valve and the liquid ammonia metering valve are in signal connection with a non-road diesel engine controller of the non-road diesel engine control system.
7. The exhaust gas after-treatment device for the off-road diesel engine using liquid ammonia as the SDPF reducing agent according to claim 4, wherein: liquid ammonia gasification device installs liquid ammonia gasification inlet tube, liquid ammonia gasification wet return, is equipped with liquid ammonia gasification solenoid valve on the liquid ammonia gasification inlet tube, liquid ammonia gasification solenoid valve and non-road diesel engine control system's non-road diesel engine controller signal connection.
8. The exhaust gas after-treatment device for the off-road diesel engine using liquid ammonia as the SDPF reducing agent according to claim 4, wherein: and the ammonia gas metering and injecting device is provided with an ammonia gas pressure sensor and an ammonia gas injecting electromagnetic valve which are both in signal connection with a non-road diesel engine controller of a non-road diesel engine control system.
9. The exhaust gas after-treatment device for the off-road diesel engine using liquid ammonia as the SDPF reducing agent according to claim 4, wherein: and an ammonia gas purification device and an ammonia gas pressure stabilizing device are sequentially arranged between the liquid ammonia gasification device and the ammonia gas metering injection device.
10. The exhaust gas post-treatment device for the non-road diesel engine using liquid ammonia as the SDPF reducing agent according to any one of claims 1 to 9, wherein: the SDPF device comprises a plurality of SDPF units, each SDPF unit is provided with an air inlet channel and an air outlet channel, the inner surface of the air inlet channel is coated with DPF passive regeneration catalyst, the inner surface of the air outlet channel is coated with SCR catalyst and ASC catalyst, and the ASC catalyst is coated on the surface of the SCR catalyst layer at the tail end of the air outlet channel.
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CN114961934A (en) * | 2022-06-15 | 2022-08-30 | 潍柴动力股份有限公司 | Engine tail gas treatment device and method |
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CN114961934A (en) * | 2022-06-15 | 2022-08-30 | 潍柴动力股份有限公司 | Engine tail gas treatment device and method |
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