Tail gas treatment device and system of fixed source diesel engine

Abstract

The utility model discloses a tail gas treatment device and system of a fixed source diesel engine. A particle treatment assembly and an online purging assembly are both electrically connected with a control assembly. The first filter valve is connected between an inlet of the packaging shell and the side, close to the fixed source diesel engine, of the exhaust manifold through a pipeline, the second filter valve is connected between an outlet of the packaging shell and the side, away from the fixed source diesel engine, of the exhaust manifold through a pipeline, and the bypass valve is located behind the connecting position of the exhaust manifold and the first filter valve. The exhaust manifold is connected with the second filter valve; the first end of the first purging unit and the first end of the second purging unit are both connected with an air source, the second end of the first purging unit is located in front of a diesel oxidation catalyst cavity, and the second end of the second purging unit is located behind a diesel particle catcher cavity. The embodiment of the utility model can effectively clean particulate matters, and is low in equipment cost and simple to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment of stationary diesel engines, in particular to a tail gas treatment device and system for stationary diesel engines. Background Art

[0002] At present, in most scenarios, the particulate matter emissions of in-use diesel generators, marine diesel engines, and vehicle diesel engine test benches cannot meet the comprehensive emission standards of air pollutants, and it is urgent to install particulate matter reduction devices. A diesel particulate filter (DPF) can filter more than 90% of the particulate matter in the exhaust gas and is an important tail gas treatment device for achieving particulate matter reduction in stationary diesel engines. Currently, related technologies have been widely applied in the fields of vehicle diesel engines and non-road diesel engines.

[0003] The DPF device for stationary diesel engines is a tail gas post-treatment emission reduction device used in fields such as generators, marine diesel engines, and vehicle diesel engine test benches that use diesel as fuel, enabling particulate matter emissions to meet the comprehensive emission standards of air pollutants. Due to the large exhaust gas flow and high particulate matter emission concentration of stationary diesel engines, it is easy to cause the DPF to be blocked by particulate matter, resulting in poor exhaust gas flow of the engine and affecting the power performance and fuel economy of the engine. The allowable exhaust gas resistance of stationary diesel engines is generally lower than that of vehicle diesel engines and non-road diesel engines. Coupled with a larger exhaust gas flow, a large-volume DPF needs to be used for particulate matter reduction.

[0004] However, the maintenance of large-volume DPFs in the prior art is difficult. If high-temperature thermal regeneration similar to that of vehicle diesel engines and non-road diesel engines is adopted, a relatively high upfront investment in auxiliary heating devices is required. Especially when using the electric heating method, extremely high heating power is often required, and on-site adjustment is often difficult to meet. Although high-pressure air can be used to efficiently clean the accumulated particulate matter in the DPF without a high upfront investment in equipment, since the DPF for stationary diesel engines is generally large in volume, each time high-pressure purging is required, a hoisting device needs to be used, and the operator needs to perform a long operation to remove the DPF module and then perform off-line purging to effectively clean the particulate matter in the DPF. Moreover, for high-emission stationary diesel engines equipped with large-volume DPFs, off-line high-pressure purging of the DPF will affect normal production scheduling and bring a large amount of maintenance work. Summary of the Utility Model

[0005] The utility model provides a tail gas treatment device and system for stationary diesel engines, which can effectively clean the particulate matter in the tail gas of stationary diesel engines, with low equipment cost and simple maintenance.

[0006] In a first aspect, an embodiment of the present utility model provides an exhaust gas treatment device for a stationary source diesel engine, comprising: a particulate treatment assembly, an on-line purging assembly, and a control assembly;

[0007] The particulate treatment assembly is fixedly connected to the exhaust manifold of the stationary source diesel engine, the on-line purging assembly is fixedly connected to the particulate treatment assembly, and both the particulate treatment assembly and the on-line purging assembly are electrically connected to the control assembly;

[0008] The particulate treatment assembly includes a bypass valve, a first filter valve, a second filter valve, a packaging housing, and a diesel oxidation catalyst chamber, a particulate collection chamber, and a diesel particulate filter chamber that are sequentially arranged in the packaging housing in a direction away from the first filter valve;

[0009] The first filter valve is connected by a pipeline between the inlet of the packaging housing and the side of the exhaust manifold close to the stationary source diesel engine, the second filter valve is connected by a pipeline between the outlet of the packaging housing and the side of the exhaust manifold away from the stationary source diesel engine, the bypass valve is located after the connection position between the exhaust manifold and the first filter valve and before the connection position between the exhaust manifold and the second filter valve;

[0010] The on-line purging assembly includes a gas source, a first purging unit, and a second purging unit; the first ends of the first purging unit and the second purging unit are both connected to the gas source, and the second end of the first purging unit is located before the diesel oxidation catalyst chamber, and the second end of the second purging unit is located after the diesel particulate filter chamber.

[0011] Optionally, it further includes: a particulate collection assembly;

[0012] The particulate collection assembly includes a particulate collection valve, a particulate suction pipe, and a negative pressure suction device;

[0013] The first end of the particulate collection valve is fixedly connected to the particulate collection chamber, and the second end of the particulate collection valve is fixedly connected to the negative pressure suction device through the particulate suction pipe.

[0014] Optionally, a diversion structure is provided on the side of the particulate collection chamber fixedly connected to the first end of the particulate collection valve.

[0015] Optionally, the first purging unit includes a first purging pipe and a first purging valve, and the second purging unit includes a second purging pipe and a second purging valve;

[0016] The first ends of the first purge valve and the second purge valve are both connected to the gas source through pipelines. The second end of the first purge valve is connected to the first end of the first purge pipe, and the second end of the second purge valve is connected to the first end of the second purge pipe. The second end of the first purge pipe is located before the diesel oxidation catalyst chamber, and the second end of the second purge pipe is located after the diesel particulate filter chamber.

[0017] Optionally, blow holes are provided on one side of the second ends of the first purge pipe and the second purge pipe close to the particle collection chamber.

[0018] Optionally, the first purge unit further includes a first pressure sensor, and the second purge unit further includes a second pressure sensor.

[0019] The first pressure sensor is installed on the first purge pipe between the encapsulation housing and the first purge valve.

[0020] The second pressure sensor is installed on the second purge pipe between the encapsulation housing and the second purge valve.

[0021] Optionally, the on-line purge assembly further includes a differential pressure transmitter.

[0022] The first end of the differential pressure transmitter is connected to one side of the encapsulation housing close to the inlet, and the second end of the differential pressure transmitter is connected to one side of the encapsulation housing close to the outlet.

[0023] Optionally, the control assembly includes a communication cable and a control cabinet.

[0024] The bypass valve, the first filter valve, the second filter valve, the first purge unit, and the second purge unit are all connected to the control cabinet through the communication cable.

[0025] Optionally, a temperature measurement assembly is further included.

[0026] The temperature measurement assembly includes a first pre-temperature sensor and a second pre-temperature sensor.

[0027] The first pre-temperature sensor is arranged before the diesel oxidation catalyst chamber, and the second pre-temperature sensor is arranged before the diesel particulate filter chamber.

[0028] In a second aspect, an embodiment of the present invention provides an exhaust gas treatment system for a stationary source diesel engine, including a stationary source diesel engine and an exhaust gas treatment device for the stationary source diesel engine as described in the first aspect.

[0029] The embodiment of the utility model provides an exhaust gas treatment device and system for a stationary source diesel engine. The device includes: a particulate treatment component, an on-line purging component, and a control component; the particulate treatment component is fixedly connected to the exhaust main pipe of the stationary source diesel engine, the on-line purging component is fixedly connected to the particulate treatment component, and both the particulate treatment component and the on-line purging component are electrically connected to the control component; the particulate treatment component includes a bypass valve, a first filter valve, a second filter valve, a packaging housing, and a diesel oxidation catalyst chamber, a particulate collection chamber, and a diesel particulate filter chamber that are sequentially arranged in the packaging housing in the direction away from the first filter valve; the first filter valve is connected between the inlet of the packaging housing and the side of the exhaust main pipe close to the stationary source diesel engine through a pipeline, the second filter valve is connected between the outlet of the packaging housing and the side of the exhaust main pipe away from the stationary source diesel engine through a pipeline, the bypass valve is located after the connection position of the exhaust main pipe and the first filter valve and before the connection position of the exhaust main pipe and the second filter valve; the on-line purging component includes a gas source, a first purging unit, and a second purging unit; the first ends of the first purging unit and the second purging unit are both connected to the gas source, and the second end of the first purging unit is located before the diesel oxidation catalyst chamber, and the second end of the second purging unit is located after the diesel particulate filter chamber. Through the mutual cooperation of the particulate treatment component, the on-line purging component, and the control component, the embodiment of the utility model can effectively clean the particulate matter in the exhaust gas of the stationary source diesel engine, with low equipment cost and simple maintenance.

[0030] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, nor is it used to limit the scope of the utility model. Other features of the utility model will become easily understood through the following description. Brief Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 Schematic diagram of an exhaust gas treatment device for a stationary source diesel engine provided by an embodiment of the utility model;

[0033] Figure 2 Schematic diagram of another exhaust gas treatment device for a stationary source diesel engine provided by an embodiment of the utility model;

[0034] Figure 3 Flowchart of a carbon cleaning maintenance judgment method for an exhaust gas treatment device for a stationary source diesel engine provided by an embodiment of the utility model;

[0035] Figure 4 The flowchart of a purging preparation method for an exhaust gas treatment device of a stationary diesel engine provided by an embodiment of the present utility model;

[0036] Figure 5 The flowchart of a purging collection operation method for an exhaust gas treatment device of a stationary diesel engine provided by an embodiment of the present utility model;

[0037] Figure 6 The structural schematic diagram of an exhaust gas treatment system of a stationary diesel engine provided by an embodiment of the present utility model. Detailed implementation manners

[0038] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0039] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0040] Figure 1 The schematic diagram of an exhaust gas treatment device of a stationary diesel engine provided by an embodiment of the present utility model, referring to Figure 1 , the exhaust gas treatment device 200 of the stationary diesel engine includes: a particulate treatment component 210, an on-line purging component 220, and a control component 230. The particulate treatment component 210 is fixedly connected to the exhaust main pipe 110 of the stationary diesel engine 100, the on-line purging component 220 is fixedly connected to the particulate treatment component 210, and both the particulate treatment component 210 and the on-line purging component 220 are electrically connected to the control component 230.

[0041] Among them, the stationary source diesel engine 100 can be a power generation internal combustion engine using diesel as fuel, a diesel engine test bench, etc. The exhaust gas treatment device 200 for the stationary source diesel engine provided by the embodiments of the present utility model can be used for reducing the particulate matter in the exhaust gas of the stationary source diesel engine 100, and the relevant emissions after treatment meet the comprehensive emission standard for air pollutants.

[0042] It can be understood that when the particulate matter in the particulate matter treatment component 210 accumulates to a certain extent, the control component 230 will issue a purge cleaning alarm prompt, then judge whether the purge conditions are met, then make preparations before purging, and start the purging operation. After the purging is completed, it will automatically switch to the normal filtration mode, which can solve the problems of high investment and high power consumption of the particulate matter reduction equipment for stationary source diesel engines.

[0043] Continue to refer to Figure 1 , the particulate matter treatment component 210 includes a bypass valve 211, a first filter valve 212, a second filter valve 213, an encapsulation housing 214, and a diesel oxidation catalytic converter chamber 215, a particulate matter collection chamber 216, and a diesel particulate filter chamber 217 that are sequentially arranged in the encapsulation housing 214 in the direction away from the first filter valve 212. The first filter valve 212 is connected by a pipeline between the inlet of the encapsulation housing 214 and the side of the exhaust main pipe 110 close to the stationary source diesel engine 100, and the second filter valve 213 is connected by a pipeline between the outlet of the encapsulation housing 214 and the side of the exhaust main pipe 110 away from the stationary source diesel engine 100. The bypass valve 211 is located after the connection position of the exhaust main pipe 110 and the first filter valve 212 and before the connection position of the exhaust main pipe 110 and the second filter valve 213; the on-line purge component 220 includes a gas source 221, a first purge unit 222, and a second purge unit 223; the first ends of the first purge unit 222 and the second purge unit 223 are both connected to the gas source 221, and the second end of the first purge unit 222 is located before the diesel oxidation catalytic converter chamber 215, and the second end of the second purge unit 223 is located after the diesel particulate filter chamber 217.

[0044] Among them, the gas source 221 can be a compressed air tank.

[0045] It is understandable that a diesel oxidation catalyst (DOC) is provided in the diesel oxidation catalyst chamber 215 of the present utility model to remove the HC component in the particulate matter, which can oxidize the soluble organic matter component in the diesel exhaust particles (derived from the hydrocarbon components in diesel and lubricating oil), prevent the particulate matter deposited in the DPF channels from agglomerating, make the particulate matter looser, facilitate subsequent purging and collection, and improve the regeneration efficiency of purging and carbon cleaning. And the DOC can oxidize NO in the exhaust gas into NO2 gas with strong oxidizing property, which is used to carry out a passive regeneration reaction with the particulate matter on the DPF. The DPF is also coated with an oxidation coating, which can, after the device reaches a relatively high exhaust temperature (above 250 °C), combine with the NO2 generated by the oxidation of the DOC to carry out a passive regeneration reaction of 2NO + C → N2 + CO2, thereby reducing the PM accumulation in the DPF. By "blowing forward" the DOC catalyst and "blowing backward" the DPF catalyst, the particulate matter is blown off the catalyst. The blown-off particulate matter will be collected through the particulate collection chamber 216. In addition, when the exhaust gas temperature is relatively high, generally above 280 °C, the diesel oxidation catalyst chamber 215 and the diesel particulate filter chamber 217 can perform the passive regeneration function of the particulate matter, and can remove a certain amount of accumulated particulate matter.

[0046] It should be noted that when purging the particulate matter, the bypass valve 211 is opened, and the first filter valve 212 and the second filter valve 213 are closed, which can prevent the purged particulate matter from entering the turbocharger of the stationary diesel engine 100 and causing engine failure, thus realizing the protection of the stationary diesel engine 100.

[0047] Specifically, in the embodiment of the present utility model, the exhaust gas of the stationary diesel engine 100 first undergoes exhaust expansion at the inlet of the encapsulation housing 214, then enters the diesel oxidation catalyst chamber 215, then enters a part of the particulate collection chamber 216, then enters the diesel particulate filter chamber 217, and finally enters the exhaust contraction part at the outlet of the encapsulation housing 214 and is discharged into the tail of the exhaust manifold 110.

[0048] Through the mutual cooperation of the particulate treatment assembly 210, the on-line purging assembly 220 and the control assembly 230 in the embodiment of the present utility model, the particulate matter in the exhaust gas of the stationary diesel engine 100 can be effectively cleaned, and the equipment cost is low and the maintenance is simple.

[0049] Figure 2 This is a schematic diagram of another exhaust gas treatment device for a stationary diesel engine provided by the embodiment of the present utility model. Optionally, on the basis of the above embodiment, refer to Figure 2, the device further includes: a particle collection assembly 240. The particle collection assembly 240 includes a particle collection valve 241, a particle suction pipe 242, and a negative pressure suction device 243. The first end of the particle collection valve 241 is fixedly connected to the particle collection chamber 216, and the second end of the particle collection valve 241 is fixedly connected to the negative pressure suction device 243 through the particle suction pipe 242.

[0050] Wherein, the negative pressure suction device 243 can be an industrial vacuum cleaner or a centrifugal fan.

[0051] It should be noted that when purging particulate matter, the bypass valve 211 and the particle collection valve 241 are opened, and the first filter valve 212 and the second filter valve 213 are closed, which can prevent the purged particulate matter from entering the turbocharger of the stationary source diesel engine 100 and achieve the protection of the stationary source diesel engine 100.

[0052] In the embodiment of the present utility model, the control assembly 230 controls the state of the particle collection valve 241 to realize the state switching between normal filtration and purging operations. The particle suction pipe 242 provides conditions for the power transmission of particulate matter. The blown particulate matter will be collected through the particle collection chamber 216 and then exported outside the particle collection chamber 216 through the negative pressure suction device 243, which can realize the function of online purging and collecting particulate matter.

[0053] Optionally, on the basis of the above embodiment, a diversion structure is provided on the side where the particle collection chamber 216 is fixedly connected to the first end of the particle collection valve 241.

[0054] In the embodiment of the present utility model, a diversion structure is provided on the side where the particle collection chamber 216 is fixedly connected to the first end of the particle collection valve 241, which can realize the collection of particulate matter. Combined with the particle collection valve 241, the particle suction pipe 242, and the negative pressure suction device 243, the function of externally collecting the collected particulate matter can be realized.

[0055] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 , the first purging unit 222 includes a first purging pipe 2221 and a first purging valve 2222, and the second purging unit 223 includes a second purging pipe 2231 and a second purging valve 2232. The first ends of the first purging valve 2222 and the second purging valve 2232 are both connected to the gas source 221 through pipelines. The second end of the first purging valve 2222 is connected to the first end of the first purging pipe 2221, and the second end of the second purging valve 2232 is connected to the first end of the second purging pipe 2231; the second end of the first purging pipe 2221 is located before the diesel oxidation catalyst chamber 215, and the second end of the second purging pipe 2231 is located after the diesel particulate filter chamber 217.

[0056] Among them, both the first purge valve 2222 and the second purge valve 2232 can be electric purge valves or pneumatic purge valves, which are used to control the purge moment. Both the first purge valve 2222 and the second purge valve 2232 can be connected to the gas source 221 through a compressed air pipe to ensure the pressure of the purge compressed air.

[0057] In the embodiment of the present utility model, the device is provided with a first purge pipe 2221 connected to the first purge valve 2222 and the gas source 221, and a second purge pipe 2231 connected to the second purge valve 2232 and the gas source 221. Under the "forward purge" of the first purge pipe 2221 in front of the diesel oxidation catalyst chamber 215 and the "reverse purge" of the second purge pipe 2231 behind the diesel particulate filter chamber 217, the on-line purge of particulate matter can be realized.

[0058] Optionally, on the basis of the above embodiment, blow holes are provided on one side of the second ends of the first purge pipe 2221 and the second purge pipe 2231 close to the particle collection chamber 216.

[0059] Among them, the number, diameter, and distribution of the blow holes can be freely set, and all the rear-end holes of the diesel particulate filter chamber 217 can be purged under the set purge pressure, so as to achieve a good purge effect.

[0060] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 , the first purge unit 222 further includes a first pressure sensor 2223, and the second purge unit 223 further includes a second pressure sensor 2233. The first pressure sensor 2223 is installed on the first purge pipe 2221 between the encapsulation housing 214 and the first purge valve 2222. The second pressure sensor 2233 is installed on the second purge pipe 2231 between the encapsulation housing 214 and the second purge valve 2232.

[0061] In the embodiment of the present utility model, the first pressure sensor 2223 and the second pressure sensor 2233 can ensure that the purge is carried out when the compressed air pressure meets the purge requirements, and ensure the efficient purge of particulate matter.

[0062] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 , the on-line purge assembly 220 further includes a differential pressure transmitter 224. The first end of the differential pressure transmitter 224 is connected to one side of the encapsulation housing 214 close to the inlet, and the second end of the differential pressure transmitter 224 is connected to one side of the encapsulation housing 214 close to the outlet.

[0063] Optionally, on the basis of the above embodiment, continue to refer to Figure 2, the control component 230 includes a communication cable 231 and a control cabinet 232. The bypass valve 211, the first filter valve 212, the second filter valve 213, the first purging unit 222, and the second purging unit 223 are all connected to the control cabinet 232 through the communication cable 231.

[0064] In the embodiment of the present utility model, automatic control is carried out by means of the communication cable 231 in combination with the control cabinet 232, which can reduce the manual operation time.

[0065] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 , the device further includes a temperature measurement component 250. The temperature measurement component 250 includes a first pre-temperature sensor 251 and a second pre-temperature sensor 252. The first pre-temperature sensor 251 is arranged before the diesel oxidation catalyst chamber 215, and the second pre-temperature sensor 252 is arranged before the diesel particulate filter chamber 217.

[0066] In the embodiment of the present utility model, the first pre-temperature sensor 251 is arranged before the diesel oxidation catalyst chamber 215, and the second pre-temperature sensor 252 is arranged before the diesel particulate filter chamber 217, which can monitor the real-time exhaust temperature of the device and judge whether it is in the high-efficiency passive regeneration range. In addition, when the exhaust temperature of the device is monitored to be abnormal, the bypass valve 211 can be opened in time to reduce the air volume of the device, reduce the oxygen content in the pipeline, so as to inhibit the oxidation rate of the particulate matter in the pipeline and ensure the safety and reliability of the device.

[0067] Figure 3 It is a flowchart of a carbon cleaning maintenance judgment method for an exhaust gas treatment device of a stationary source diesel engine provided by an embodiment of the present utility model. For the convenience of understanding the working principle of the exhaust gas treatment device of the stationary source diesel engine in the embodiment of the present utility model, refer to Figure 3 , the method includes the following steps:

[0068] S310. Obtain the purge trigger differential pressure limit value allowed by the stationary source diesel engine.

[0069] S320. Control both the first filter valve and the second filter valve to open, close both the particle collection valve and the bypass valve, and start the stationary source diesel engine.

[0070] S330. Obtain the differential pressure detection value of the differential pressure transmitter.

[0071] S340. Compare whether the differential pressure detection value is less than or equal to the purge trigger differential pressure limit value.

[0072] S350. If the differential pressure detection value is less than or equal to the purge trigger differential pressure limit value, perform anti-misjudgment timing.

[0073] S360. Compare whether the anti-misjudgment timing time is greater than or equal to the program anti-misjudgment setting value.

[0074] S370. If the anti-misjudgment timing time is greater than or equal to the program anti-misjudgment setting value, a purge maintenance alarm prompt is issued.

[0075] It can be understood that when the accumulated particulate matter reaches a certain level, the backflush carbon cleaning function can be judged based on the differential pressure detection value of the differential pressure transmitter and the purge trigger differential pressure limit value. In addition, to avoid sudden increases in differential pressure caused by special circumstances, the present utility model has an anti-misjudgment function. By anti-misjudgment timing, it is compared whether the anti-misjudgment timing is greater than or equal to the program anti-misjudgment setting value. When the anti-misjudgment timing time is greater than or equal to the program anti-misjudgment setting value, a purge maintenance alarm prompt is issued, which can prompt the user that carbon cleaning maintenance is required.

[0076] In addition, when purge carbon cleaning is required, the preparation for purge collection operation needs to be carried out first. Figure 4 It is a flowchart of a purge preparation method for an exhaust gas treatment device of a stationary source diesel engine provided by an embodiment of the present utility model. Refer to Figure 4 , and this method includes the following steps:

[0077] S410. Obtain the detection values of the first pressure sensor and the second pressure sensor.

[0078] S420. Obtain the purge air pressure limit value.

[0079] S430. Compare whether the detection values of the first pressure sensor and the second pressure sensor are both greater than or equal to the purge air pressure limit value.

[0080] S440. If the detection values of the first pressure sensor and the second pressure sensor are both less than the purge air pressure limit value, control the bypass valve to open.

[0081] S450. Control both the first filter valve and the second filter valve to close.

[0082] S460. Control both the particle collection valve and the negative pressure suction device to open.

[0083] It can be understood that after determining that the purge compressed air pressure is satisfied, first control the states of each valve group to ensure that the purge collection can operate normally. First, open the bypass valve to avoid the diesel engine from stalling due to "suffocation" caused by the closing of the first filter valve and the second filter valve. Then, close the first filter valve and the second filter valve, and then open the particle collection valve and start the negative pressure suction device to complete the preparation work before purge collection.

[0084] Figure 5 It is a flowchart of a purge collection operation method for an exhaust gas treatment device of a stationary source diesel engine provided by an embodiment of the present utility model. Refer to Figure 5 , and this method includes the following steps:

[0085] S510. Control the second purge valve to open and time the opening time of the second purge valve.

[0086] S520. When the opening time of the second purge valve is equal to the DPF purge time limit value, determine that the DPF purge satisfies one purge cycle.

[0087] S530. When the number of purge cycles of the DPF purge is greater than or equal to the DPF purge cycle limit value, close the second purge valve.

[0088] S540. Control the first purge valve to open and time the opening time of the first purge valve.

[0089] S550. When the opening time of the first purge valve is equal to the DOC purge time limit value, determine that the DOC purge satisfies one purge cycle.

[0090] S560. When the number of purge cycles of the DOC purge is greater than or equal to the DOC purge cycle limit value, close the first purge valve.

[0091] S570. Control the negative pressure suction device to close.

[0092] It can be understood that during specific particulate matter purging, the DPF purge is carried out first, and then the DOC purge is carried out. The sequence can be adjusted according to actual operations. In this embodiment, the purge of the DPF adopts a "reverse purge" mode from the back to the front, while the DOC adopts a "forward purge" mode from the front to the back, which is convenient for particulate matter collection and can also improve the particulate matter purge efficiency.

[0093] Figure 6 It is a schematic structural diagram of an exhaust gas treatment system for a stationary source diesel engine provided by an embodiment of the present invention. Refer to Figure 6 , this device includes a stationary source diesel engine 100 and an exhaust gas treatment device 200 of the stationary source diesel engine.

[0094] In the embodiment of the present invention, the exhaust gas treatment system of the stationary source diesel engine includes the exhaust gas treatment device 200 of the stationary source diesel engine provided in the above embodiment, so it has the same beneficial effects and will not be elaborated here.

[0095] The above specific implementation manners do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An exhaust gas treatment device for a fixed source diesel engine, characterized in that: include: Particle handling components, online purge components, and control components; The particle treatment component is fixedly connected to the exhaust manifold of the fixed source diesel engine, the online purge component is fixedly connected to the particle treatment component, and both the particle treatment component and the online purge component are electrically connected to the control component; The particle treatment assembly comprises a bypass valve, a first filter valve, a second filter valve, a packaging shell, and a diesel engine oxidation catalyst chamber, a particle collection chamber, and a diesel engine particle trap chamber which are sequentially arranged in the packaging shell in a direction away from the first filter valve; The first filter valve is connected between the inlet of the encapsulation shell and the side of the exhaust manifold close to the fixed source diesel engine through a pipeline, the second filter valve is connected between the outlet of the encapsulation shell and the side of the exhaust manifold away from the fixed source diesel engine through a pipeline, and the bypass valve is located after the connection position of the exhaust manifold and the first filter valve and before the connection position of the exhaust manifold and the second filter valve; The online purge assembly includes an air source, a first purge unit and a second purge unit; the first ends of the first purge unit and the second purge unit are both connected to the air source, the second end of the first purge unit is located before the diesel engine oxidation catalyst cavity, and the second end of the second purge unit is located after the diesel engine particulate trap cavity.

2. The exhaust gas treatment device for a stationary source diesel engine according to claim 1, characterized in that: Also includes: Particle collection assembly; The particle collection assembly includes a particle collection valve, a particle suction pipe and a negative pressure suction device; The first end of the particle collection valve is fixedly connected to the particle collection chamber, and the second end of the particle collection valve is fixedly connected to the negative pressure suction device through the particle suction pipe.

3. The exhaust gas treatment device for a fixed source diesel engine according to claim 2, characterized in that: A flow guiding structure is provided on one side of the particle collecting chamber which is fixedly connected to the first end of the particle collecting valve.

4. The exhaust gas treatment device for a stationary source diesel engine according to claim 1, characterized in that: The first purge unit includes a first purge pipe and a first purge valve, and the second purge unit includes a second purge pipe and a second purge valve; The first ends of the first purge valve and the second purge valve are connected to the gas source through a pipeline, the second end of the first purge valve is connected to the first end of the first purge pipe, and the second end of the second purge valve is connected to the first end of the second purge pipe; the second end of the first purge pipe is located before the diesel engine oxidation catalyst cavity, and the second end of the second purge pipe is located after the diesel engine particulate trap cavity.

5. The exhaust gas treatment device for a stationary source diesel engine according to claim 4, characterized in that: A soot blowing hole is provided on one side of the second end of the first purge pipe and the second purge pipe close to the particle collecting chamber.

6. The exhaust gas treatment device for a stationary source diesel engine according to claim 4, characterized in that: The first purge unit further includes a first pressure sensor, and the second purge unit further includes a second pressure sensor; The first pressure sensor is mounted on the first purge pipe between the packaging housing and the first purge valve; The second pressure sensor is installed on the second purge pipe between the packaging housing and the second purge valve.

7. The exhaust gas treatment device for a stationary source diesel engine according to claim 1, characterized in that: The online purge assembly also includes a differential pressure transmitter; The first end of the differential pressure transmitter is connected to a side of the packaging shell close to the inlet, and the second end of the differential pressure transmitter is connected to a side of the packaging shell close to the outlet.

8. The exhaust gas treatment device for a stationary source diesel engine according to claim 1, characterized in that: The control assembly includes a communication cable and a control cabinet; The bypass valve, the first filter valve, the second filter valve, the first purge unit, and the second purge unit are all connected to the control cabinet via the communication cable.

9. The exhaust gas treatment device for a stationary source diesel engine according to claim 1, characterized in that: Also included is a temperature measurement component; The temperature measurement assembly includes a first front temperature sensor and a second front temperature sensor; The first front temperature sensor is disposed before the diesel engine oxidation catalyst cavity, and the second front temperature sensor is disposed before the diesel engine particulate trap cavity.

10. An exhaust gas treatment system for a fixed source diesel engine, characterized in that: The invention comprises a stationary source diesel engine and an exhaust gas treatment device for the stationary source diesel engine as claimed in any one of claims 1 to 9.

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