Tail gas purification device for hot-line work vehicle

Abstract

The invention discloses a tail gas purification device for a hot-line work vehicle. The technical problem that in the prior art, due to the fact that multiple hot-line work vehicles arranged in a high-density mode run at an idle speed, the environment air quality is poor is solved. The tail gas purification device for the hot-line work vehicle comprises a shell, a purification assembly and a heater, the shell is provided with an inlet allowing tail gas to enter and an outlet allowing purified tail gas to be exhausted, one end of the purification assembly communicates with the inlet, the other end of the purification assembly communicates with the outlet, the purification assembly comprises a DOC carrier and a DPF carrier, and the heater is arranged in the shell. The DOC carrier and the DPF carrier are used for purifying tail gas, the DOC carrier and the DPF carrier are sequentially arranged in the tail gas emission direction, and the heater is used for heating the purification assembly. According to the tail gas purification device for the hot-line work vehicle, the purification assembly is heated through the heater, and the purification effect of the purification assembly on low-temperature tail gas can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tail gas purification device, especially the tail gas purification device for live working vehicle. BACKGROUND

[0002] With the rapid development of the power industry, mobile live working vehicles are increasingly widely used in power systems. These vehicles usually need to be equipped with diesel engines to provide stable power when performing live working tasks.

[0003] The live working training base of the power supply company undertakes heavy live working training tasks every year. Among them, the intermediate potential method (live working vehicle) operation project training task accounts for a high proportion, and most of the live working vehicles are still of national fourth and fifth emission standards. Due to the limited space of the training site, the vehicle density is high, multiple live working vehicles are started at the same time, the operation time is long, the vehicle is in a long idle running state, and the particulate matter, CO and CH compounds in the vehicle exhaust seriously affect the air quality of the site. It is easy to cause cough, dizziness, nasal congestion and other adverse physical reactions of training students and training teachers, which not only affects the training effect, but also causes harm to the bodies of training students and teachers. SUMMARY

[0004] The present application is proposed to overcome the deficiencies of the prior art and provides a tail gas purification device for a live working vehicle to solve the technical problem of poor environmental air quality caused by the idle running of multiple live working vehicles with high density in the prior art.

[0005] In order to achieve the above technical target, the tail gas purification device for a live working vehicle proposed by the present application comprises: a housing having an inlet for tail gas to enter and an outlet for purified tail gas to be discharged; a purification assembly communicating with one end of the inlet and the other end of the outlet, the purification assembly comprising a DOC carrier and a DPF carrier, the DOC carrier and the DPF carrier being used for purifying tail gas, the DOC carrier and the DPF carrier being arranged in sequence along the direction of tail gas discharge; and a heater for heating the purification assembly.

[0006] The tail gas purification device for a live working vehicle proposed by the present application comprises a purification assembly and a heater, and the heater is used to heat the purification assembly. The lower temperature tail gas generated by the live working vehicle in a cold state can be purified in the heated purification assembly, which helps to improve the purification effect of the purification assembly on the lower temperature tail gas.

[0007] As preferred, the heater comprises a first heating ring for heating the DOC carrier, the first heating ring being sleeved on the outer periphery of the DOC carrier.

[0008] With the foregoing technical solution, the DOC carrier is heated by the heater, so that the DOC carrier is at an optimal working temperature, thereby making the DOC carrier have an optimal reaction efficiency and reducing the emission of gas pollutants in the exhaust gas.

[0009] As preferred, the heater further comprises a second heating ring for heating the DPF carrier, the second heating ring being sleeved on the outer periphery of the DPF carrier.

[0010] With the foregoing technical solution, the DPF carrier is heated by the heater, so that the solid particles intercepted by the DPF carrier can react with the gas products generated by the DOC carrier purifying the exhaust gas at a suitable temperature, making the solid particles be converted into gas by secondary combustion, accelerating the regeneration of the DPF carrier, and avoiding the blockage of the DPF carrier.

[0011] As preferred, the exhaust gas detector is further provided for detecting at least one of the pressure, temperature and PM value of the exhaust gas entering the purification assembly and generating a corresponding detection signal.

[0012] With the foregoing technical solution, the exhaust gas purification device can know the temperature of the exhaust gas entering the purification assembly, thereby providing a basis for whether the heater works.

[0013] As preferred, the controller is further provided for controlling the heater to work based on the detection signal of the exhaust gas detector.

[0014] With the foregoing technical solution, the detection signal of the exhaust gas detection sensor can control the working of the heater through the controller.

[0015] As preferred, the SCR system is further provided for being communicated between the purification assembly and the exhaust port.

[0016] With the foregoing technical solution, the SCR system is used to purify nitrogen oxides in the exhaust gas, thereby further improving the purification effect of the exhaust gas purification device.

[0017] As preferred, the activated carbon adsorption box is further provided for being connected to the exhaust port to purify the discharged exhaust gas.

[0018] With the foregoing technical solution, the purification effect of the exhaust gas purification device can be further improved.

[0019] As preferred, the purification assembly further comprises a first joint, the first joint comprising a first through diameter section and a second through diameter section connected in series, the first through diameter section being connected to the air inlet, the second through diameter section being connected to the DOC carrier, the inner diameter of the second through diameter section being larger than the inner diameter of the first through diameter section.

[0020] By the above technical scheme, the first joint is arranged to connect the air inlet and the DOC carrier, and the flow speed of the exhaust gas near the air inlet is made larger than the flow speed in the DOC carrier, so that the exhaust gas needs more time to flow through the DOC carrier, and the exhaust gas can be fully reacted in the DOC carrier, thereby improving the purification efficiency of the DOC carrier.

[0021] As preferred, the purification assembly further comprises a second joint, the second joint comprising a third through diameter section and a fourth through diameter section connected in series, the third through diameter section being connected to the air outlet, the fourth through diameter section being connected to the DPF carrier, the inner diameter of the fourth through diameter section being larger than the inner diameter of the third through diameter section.

[0022] By the above technical scheme, the second joint is arranged to connect the DPF carrier and the air outlet, and the flow speed of the exhaust gas near the air outlet is made larger than the flow speed in the DPF carrier, so that the exhaust gas needs more time to flow through the DPF carrier, thereby the solid particles in the exhaust gas can be more intercepted by the DPF carrier, and the purification efficiency of the DPF carrier is improved.

[0023] As preferred, the DOC carrier and the DPF carrier are connected in series and fixed by a clamp.

[0024] By the above technical scheme, the exhaust gas has substantially equal flow speed in the DOC carrier and the DPF carrier, so that the exhaust gas needs more time to flow through the DPF carrier, thereby the interception efficiency of the solid particles in the exhaust gas by the DPF carrier is improved, and the gaseous products in the exhaust gas can be fully reacted with the intercepted solid particles, thereby the regeneration efficiency of the DPF carrier is improved, and the risk of DPF blockage is reduced.

[0025] The features and advantages of the present application will be described in detail in the following specific embodiments, drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a schematic view of an exhaust gas purification device according to an embodiment of the present application; Figure 2 FIG. 2 is a schematic view of a purification assembly and a heater according to an embodiment of the present application; Figure 3 FIG. 3 is a schematic view of an activated carbon adsorption box according to an embodiment of the present application; Figure 4 FIG. 4 is a front view of an exhaust gas purification device according to an embodiment of the present application; Figure 5 FIG. 1 is a schematic view of an exhaust purification device according to an embodiment of the present application.

[0027] Reference signs: 100, housing, 101, air inlet, 102, exhaust port, 103, exhaust hole, 110, traveling wheel; 200, purification assembly, 210, DOC carrier, 220, DPF carrier, 230, first joint, 231, first diameter section, 232, second diameter section, 240, second joint, 241, third diameter section, 242, fourth diameter section; 300, heater, 310, first heating ring, 320, second heating ring; 400, activated carbon adsorption box. DETAILED DESCRIPTION

[0028] The technical solutions of the embodiments of the present application will be explained and described below in combination with the drawings of the embodiments of the present application. However, the following embodiments are only preferred embodiments of the present application, and not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of", "several" is two or more, unless otherwise explicitly limited.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] As shown in Figure 1 , Figure 2 The tail gas purification device provided in the embodiment of the present application includes a shell 100, a purification assembly 200 and a heater 300. The shell 100 has a gas inlet 101 for the tail gas to enter and a gas outlet 102 for the purified tail gas to be discharged. The exhaust pipes of a plurality of live-line working vehicles parked in a live-line working training base are connected by pipelines to converge the tail gas to the gas inlet 101 of the tail gas purification device.

[0033] The bottom of the shell 100 is provided with a traveling wheel 110, so that the operator can push the tail gas purification device to travel.

[0034] One end of the purification assembly 200 is communicated with the gas inlet 101, and the other end is communicated with the gas outlet 102. The purification assembly 200 includes a DOC carrier 210 and a DPF carrier 220, and the DOC carrier 210 and the DPF carrier 220 are used for purifying the tail gas. The DOC carrier 210 and the DPF carrier 220 are arranged in sequence along the direction of the tail gas discharge. The heater 300 is used for heating the purification assembly 200.

[0035] The DOC carrier 210 usually has a straight-through honeycomb internal structure, and a noble metal catalyst coating (such as palladium, platinum, rhodium, iridium, ruthenium, osmium, etc.) is coated on the surface of the internal structure to convert gaseous pollutants in the tail gas. The gaseous pollutants include carbon monoxide, hydrocarbons, etc. The internal structure can adopt a ceramic carrier, or a metal carrier (such as iron-chromium-aluminum alloy).

[0036] The DPF carrier 220 usually has a wall-flow honeycomb internal structure, and the wall-flow honeycomb internal structure has a large number of parallel channels, one end of each parallel channel is closed and the other end is open, and a small pore channel is arranged on the wall of the parallel channel to communicate adjacent parallel channels. In the process of discharging the tail gas through the small pore channel, the particulate matter in the tail gas cannot pass through the small pore channel, so as to be captured by the DPF carrier 220.

[0037] When the live working vehicle is in a cold state, the insufficient combustion of fuel in the diesel engine makes the content of gaseous pollutants and particulate matter in the tail gas higher, and the tail gas temperature is lower at this time, and the purification efficiency of the purification assembly 200 for the lower temperature tail gas is weaker, and the best purification effect cannot be achieved.

[0038] The tail gas purification device for the live working vehicle provided by the application comprises a purification assembly 200 and a heater 300, and the heater 300 is used for heating the purification assembly 200, so that the lower temperature tail gas generated by the live working vehicle in a cold state can be purified in the heated purification assembly 200, and the purification effect of the purification assembly 200 for the lower temperature tail gas is improved.

[0039] It should be noted that the live working vehicle of the national fourth and fifth emission standards has high cost and long cycle for modifying the tail gas emission equipment. A tail gas purification device only needs to connect the exhaust pipe of the live working vehicle to the tail gas purification device to purify the tail gas, and multiple live working vehicles can also be connected through a one-to-many air duct, which has low modification cost and short modification cycle, and does not affect the normal use of the live working vehicle during modification.

[0040] Based on the foregoing embodiments, as shown in Figure 2 In this embodiment, the heater 300 comprises a first heating ring 310 for heating the DOC carrier 210, and the first heating ring 310 is sleeved on the outer periphery of the DOC carrier 210.

[0041] In this embodiment, the first heating ring 310 is a ceramic heating ring.

[0042] The optimal working temperature of the DOC carrier 210 is 200°C-450°C, and when the tail gas temperature is lower than 200°C, the catalyst activity on the inner surface of the DOC carrier 210 is insufficient, and the reaction efficiency of the DOC carrier 210 is lower. The heater 300 heats the DOC carrier 210, so that the DOC carrier 210 is at an optimal working temperature, thereby improving the purification efficiency of the DOC carrier 210.

[0043] The heater 300 is used for heating the DOC carrier 210, so that the DOC carrier 210 is at an optimal working temperature, thereby making the DOC carrier 210 have an optimal reaction efficiency and reducing the emission of gaseous pollutants in the tail gas.

[0044] The main task of the DOC carrier 210 is to oxidize (burn) several gaseous pollutants in the diesel tail gas, which specifically includes the following reaction formulas: 2CO+O2→2CO2; HC+O2→CO2+H2O; 2NO + O2 → 2NO2.

[0045] HC refers to hydrocarbons in exhaust gas.

[0046] Based on the foregoing embodiments, such as Figure 2 As shown, in this embodiment, the heater 300 further includes a second heating ring 320 for heating the DPF carrier 220, and the second heating ring 320 is fitted around the outer periphery of the heating DPF carrier 220.

[0047] In this embodiment, the second heating ring 320 is a ceramic heating ring.

[0048] The primary task of the DPF carrier 220 is to intercept solid particulate matter in diesel exhaust, and it comprises two core steps: capture and regeneration. Capture, a physical interception, is the fundamental function of the DPF carrier 220; larger solid particles cannot pass through the tiny pores on the carrier and are thus captured. Regeneration, a crucial step in the DPF carrier 220's purification process, utilizes the exhaust temperature and a catalyst to cause secondary combustion of the intercepted solid particles, converting the solid pollutants into gaseous substances for emission and preventing clogging of the DPF carrier 220.

[0049] The catalyst in the DPF support 220 that enables the secondary combustion of solid particulate matter can be a noble metal catalyst coated on the honeycomb internal structure of the DPF support 220, or a strong oxidant contained in the exhaust gas.

[0050] Because NO2, which has strong oxidizing properties at relatively low temperatures (around 250°C), is generated during the purification process of DOC carrier 210, the particulate matter intercepted in DPF carrier 220 reacts with NO2 and is converted into gas. The specific reaction formula is as follows: C + 2NO₂ → CO₂ + 2NO; C + NO₂ → CO + NO.

[0051] When a live-line work vehicle is cold, the exhaust gas temperature is low. When multiple live-line work vehicles are idling at low speed while cold, there are more solid particles in the exhaust gas, which can easily cause blockage of the DPF carrier 220, affecting exhaust emissions and purification effect.

[0052] The DPF carrier 220 is heated by heater 300. The solid particles intercepted by the DPF carrier 220 can react with the gaseous products generated by the DOC carrier 210 in the exhaust gas at a suitable temperature, so that the solid particles can be combusted again and converted into gas, which accelerates the regeneration of the DPF carrier 220 and avoids the blockage of the DPF carrier 220.

[0053] Based on all the foregoing embodiments, in the present embodiment, the tail gas purification device further comprises a tail gas detection sensor, which is configured to detect at least one of the pressure, temperature and PM value of the tail gas entering the purification assembly 200 and generate a corresponding detection signal.

[0054] The tail gas detection sensor is installed in front of or in the DOC carrier 210 to detect the temperature of the tail gas entering the purification assembly 200.

[0055] When the pressure value is too high, it means that the DPF carrier 220 may be blocked, and the DPF carrier 220 needs to be heated to speed up the regeneration of the DPF carrier 220; when the temperature is too low, it means that the DOC carrier 210 may not be at a good working temperature, and the DOC carrier 210 needs to be heated to have a better purification efficiency; when the PM value is too high, it means that the tail gas contains a high content of solid particulate matter, and the DPF carrier 220 needs to be heated to speed up the regeneration of the DPF carrier 220.

[0056] In this way, the tail gas purification device can know the state of the tail gas entering the purification assembly 200, thereby providing a basis for whether the heater 300 works.

[0057] It should be noted that the pressure, temperature and PM value of the tail gas need to be detected by different sensors.

[0058] Preferably, the tail gas purification device further comprises a controller, which is configured to control the heater 300 to work based on the detection signal of the tail gas detection sensor.

[0059] By providing the controller, the detection signal of the tail gas detection sensor can control the working of the heater 300 through the controller.

[0060] Based on all the foregoing embodiments, in the present embodiment, the tail gas purification device further comprises an SCR system, which is connected between the purification assembly 200 and the exhaust port 102.

[0061] The SCR system is used to purify nitrogen oxides in the tail gas, and the SCR system converts nitrogen oxides into nitrogen and water under the action of a catalyst. The SCR system usually uses urea as a catalyst, and the specific steps and reaction formula are as follows.

[0062] Urea decomposition: (NH2)2CO + H2O → 2NH3 + CO2.

[0063] Catalytic reduction: 4NO + 4NH3 + O2 → 4N2 + 6H2O; 2NO2+4NH3+O2→3N2+6H2O; NO+NO2+2NH3→2N2+3H2O.

[0064] The SCR system is used to purify the nitrogen oxides in the tail gas, thereby further improving the purification effect of the tail gas purification device.

[0065] Based on all the foregoing embodiments, as shown in Figures 3 to 5 In this embodiment, the tail gas purification device further comprises an activated carbon adsorption box 400 connected to the exhaust port 102 to purify the discharged tail gas.

[0066] In this embodiment, the activated carbon adsorption box 400 is arranged in a drawer shape, and the housing 100 is provided with a cavity for accommodating the activated carbon adsorption box 400 and an opening hole for plug-in cooperation with the activated carbon adsorption box 400. The activated carbon adsorption box 400 is provided with two and is arranged at intervals. The exhaust port 102 is connected to the cavity, and a plurality of exhaust holes 103 are arranged on the cavity wall away from the exhaust port 102. The activated carbon adsorption box 400 is located between the exhaust port 102 and the exhaust hole 103, so that the tail gas discharged from the exhaust port 102 is filtered by the two activated carbon adsorption boxes 400 and discharged from the exhaust hole 103.

[0067] The activated carbon can further adsorb a small amount of hydrocarbons, odor substances and part of the pollutants that are not completely treated in the tail gas, thereby improving the tail gas purification effect.

[0068] By arranging the activated carbon adsorption box 400, the purification effect of the tail gas purification device can be further improved.

[0069] Based on all the foregoing embodiments, as shown in Figure 2 In this embodiment, the purification assembly 200 further comprises a first connector 230, which comprises a first diameter section 231 and a second diameter section 232 connected thereto. The first diameter section 231 is connected to the gas inlet 101, and the second diameter section 232 is connected to the DOC carrier 210. The inner diameter of the second diameter section 232 is greater than that of the first diameter section 231.

[0070] The first connector 230 is arranged to connect the gas inlet 101 and the DOC carrier 210, and to make the flow speed of the tail gas near the gas inlet 101 greater than that in the DOC carrier 210, so that the tail gas needs more time to flow through the DOC carrier 210. The tail gas can fully react in the DOC carrier 210, thereby improving the purification efficiency of the DOC carrier 210.

[0071] Based on all the foregoing embodiments, as shown in Figure 2As shown, in the embodiment, the purification assembly 200 further comprises a second joint 240, the second joint 240 comprising a third through section 241 and a fourth through section 242 connected in sequence, the third through section 241 being connected to the exhaust port 102, and the fourth through section 242 being connected to the DPF carrier 220, the inner diameter of the fourth through section 242 being larger than that of the third through section 241.

[0072] The second joint 240 is arranged to connect the DPF carrier 220 and the exhaust hole 103, and to make the exhaust gas flow out of the exhaust port 102 at a speed greater than that in the DPF carrier 220, so that the exhaust gas needs more time to flow through the DPF carrier, and thus the solid particles in the exhaust gas can be more intercepted by the DPF carrier 220, improving the purification efficiency of the DPF carrier 220.

[0073] Based on all the foregoing embodiments, as Figure 2 As shown, in the embodiment, the DOC carrier 210 and the DPF carrier 220 are connected in sequence and fixed by a clamp.

[0074] In this way, the exhaust gas has substantially equal flow rates in the DOC carrier 210 and in the DPF carrier 220, so that the exhaust gas also needs a relatively long time to flow through the DPF carrier 220, improving the interception efficiency of the DPF carrier 220 for the solid particles in the exhaust gas, and also helping the gaseous products in the exhaust gas to fully react with the intercepted solid particles, improving the regeneration efficiency of the DPF carrier 220 and reducing the risk of DPF blockage.

[0075] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and those skilled in the art should understand that the present application includes but is not limited to the contents described in the above specific embodiments and the accompanying drawings. Any modification not deviating from the functional and structural principles of the present application shall be included in the scope of the claims.

Claims

1. An exhaust gas purification device characterized by comprising: The application relates to a tail gas purifying device. The device comprises: a housing having an inlet for tail gas and an outlet for purified tail gas; a purifying assembly connected to the inlet and the outlet, the purifying assembly comprising a DOC carrier and a DPF carrier for purifying the tail gas, the DOC carrier and the DPF carrier being arranged in sequence along the direction of tail gas discharge; and 2. The exhaust gas purification apparatus according to claim 1, characterized by a heater for heating the purifying assembly.

3. The exhaust gas purification device according to claim 2, characterized by The heater comprises a first heating ring for heating the DOC carrier, the first heating ring being sleeved on the outer periphery of the DOC carrier.

4. The exhaust gas purification apparatus according to claim 1, characterized by The heater further comprises a second heating ring for heating the DPF carrier, the second heating ring being sleeved on the outer periphery of the DPF carrier.

5. The exhaust gas purification device according to claim 4, characterized by The device further comprises a tail gas detector for detecting at least one of the pressure, temperature and PM value of the tail gas entering the purifying assembly and generating a corresponding detection signal.

6. The exhaust gas purification apparatus according to claim 1, characterized by The device further comprises a controller for controlling the heater based on the detection signal of the tail gas detector.

7. The exhaust gas purification device according to claim 1, wherein The device further comprises an SCR system connected between the purifying assembly and the outlet.

8. The exhaust gas purification device according to claim 1, wherein The device further comprises an activated carbon adsorption box connected to the outlet for purifying the discharged tail gas.

9. The exhaust gas purification device according to claim 1, wherein The purifying assembly further comprises a first joint comprising a first diameter section and a second diameter section connected in sequence, the first diameter section being connected to the inlet, the second diameter section being connected to the DOC carrier, the inner diameter of the second diameter section being larger than that of the first diameter section.

10. The exhaust gas purification device according to claim 1, wherein The purifying assembly further comprises a second joint comprising a third diameter section and a fourth diameter section connected in sequence, the third diameter section being connected to the outlet, the fourth diameter section being connected to the DPF carrier, the inner diameter of the fourth diameter section being larger than that of the third diameter section. The DOC carrier and the DPF carrier are connected in sequence and fixed by a clamp.

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