JPH04129824U - Diesel engine exhaust gas purification device - Google Patents

Abstract

(57) [Summary] [Purpose] To remove the ash accumulated in the diesel particulate filter through regeneration treatment and to reliably restore the purification ability. [Configuration] A diesel particulate filter (DP) is installed above the inlet pipe 11a inside the jacket 1.
F) 2 and a regeneration electric heater 3 are installed. The outer peripheral surface of the jacket 1 is provided with a DPF 2 by applying vibration to the DPF 2.
An ultrasonic oscillator 7 is provided to shake off the ash deposited on the 2. In a recess 11b below the inlet pipe 11a in the jacket 1, an ash collecting part 8 is arranged to collect and store the shaken-off ash.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an exhaust gas purification device for a diesel engine.

0002

[Conventional technology]

As a conventional exhaust gas purification device for a diesel engine, for example, Utility Model Application Publication No. 2-195 The one disclosed in Publication No. 39 is known. This exhaust gas purification device is shown in Figure 2. A jacket 100 that communicates with an exhaust pipe of a diesel engine and allows exhaust gas to pass therethrough. and a device installed inside this jacket that collects particulates in the exhaust gas. -zel particulate filter (hereinafter referred to as DPF) 101 and jacket Particulates disposed in the DPF 100 and collected in the DPF 101 are burned and removed. It is equipped with a regeneration electric heater 102.

0003 In this exhaust gas purification device, the exhaust gas from the diesel engine is filtered through the jacket 10. The hydrocarbons contained in the exhaust gas are guided to the DPF 101 in the exhaust gas. Collects particulates such as carbon and carbon. Particulates are captured to some extent. If collected, the collection ability of DPF101 will decrease and fuel efficiency will be affected. Since the back pressure increases to the extent that the Under a predetermined electric power, the regeneration electric heater 102 connected to the onboard battery via the At the same time, a predetermined amount of exhaust gas is supplied with electricity for regeneration to ensure effective combustion. It is supplied to the heater 102 and the DPF 101, and the heat of the regeneration electric heater 102 is used to The DPF 101 is being regenerated by burning the ticulate.

0004

[Problem that the idea aims to solve]

However, when the above regeneration process is performed, ash mainly composed of CaSO ₄ and Fe ₂ O ₃ is generated by Ca and the like in the engine oil, and is deposited on the DPF 101 . For this reason, in the conventional exhaust gas purification apparatus, the repetition of the regeneration process causes an increase in the necessary regeneration process temperature and back pressure, which makes it difficult to recover the purification ability of the DPF.

[0005] In order to remove the ash deposited on the DPF 101, As disclosed in Publication No. 6, a fan is installed on the upstream side of DPF 101 to It is also possible to adopt a method of blowing away the ash accumulated on DPF101 by force. However, DPF101 has countless fine cells, and the ash deposited on the cell walls There are limits to how much water can be removed by wind power.

[0006] This invention was made in view of the above circumstances, and the regeneration process removes the deposits on the DPF. The solution is to reliably remove the ash and restore the purification ability of the DPF. This is a technical issue that must be resolved.

[0007]

[Means to solve the problem]

The present invention provides the exhaust gas purification device for a diesel engine, in which the jacket includes: Vibrations are applied to the DPF to reduce the amount of particulates generated due to combustion and deposited on the DPF. A vibrator shakes off the accumulated ash and collects the ash that has been shaken off. It is characterized by having an ash collecting section.

[0008] The above-mentioned DPF is not particularly limited, but honeycomb having countless fine cells may be used. DPF consisting of a system structure, and the end face on the exhaust gas inlet side or outlet of each of the above cells. DPF with alternately closed end faces on the mouth side and so-called porous filters with a three-dimensional network structure Ceramic filters can be used. The above-mentioned vibrator is not particularly limited as long as it can impart vibration to the DPF. Not possible.

[0009] The above ash collection section collects and stores the ash shaken off from the DPF. It is made of heat-resistant foamed ceramic with a three-dimensional network structure. can be achieved.

0010

[Effect]

In the exhaust gas purification device of the present invention, a vibrator is activated to apply vibration to the DPF. By doing so, the ash generated by DPF regeneration and deposited on the DPF can be reliably shaken out. It can be removed easily. Then, use the ash that was shaken out from the DPF. It can be collected and stored in the water collection section.

[0011] Therefore, inconveniences caused by the accumulation of ash on the DPF, for example, It is possible to reliably prevent an increase in the necessary regeneration processing temperature and back pressure.

0012

【Example】

Hereinafter, embodiments embodying the present invention will be described with reference to the drawings. This exhaust gas purification device is connected to a forklift diesel engine (not shown). As shown in Figure 1, it is a vertical type that communicates with the exhaust pipe of a diesel engine. A jacket 1 through which exhaust gas passes, and a DPF 2 disposed within this jacket 1. And, the regeneration heater is mounted on the jacket 1 facing the upstream side of the DPF 2. 3.

[0013] The jacket 1 has an integral inlet pipe 11a on the side that communicates with the exhaust pipe. The formed bottomed cylindrical stainless steel jacket body 11 and the jacket body 11 stainless steel with an outlet pipe 12a fixed to the open end and communicating with the outside. It consists of a cap 12 made of A back pressure sensor 4 is installed inside the inlet pipe 11a. The server 4 is connected to a control unit 5.

[0014] Inside the jacket 1, a sealing material 6 is provided above the inlet pipe 11a. DPF2 is held. This DPF2 has both end faces of the cell alternately blocked. It is made of commercially available cordierite. On the upstream side of the DPF 2 inside the jacket 1, there is an electric heater for regeneration in contact with the DPF 2. 3 is provided. This regeneration electric heater 3 is connected to the control unit 5. Operate more controlled.

[0015] At the vertical center of the DPF 2 on the outer circumferential side of the jacket 1, there is an excitation device of the present invention. One ultrasonic oscillator 7 or two or more ultrasonic oscillators 7 constituting the device are disposed at equal intervals in the circumferential direction and fixed. It is worn. This ultrasonic oscillator 7 is connected to the control unit 5 . A recess 11b is formed in the jacket 1 below the inlet pipe 11a. In this recess 11b, an ash collecting section 8 made of foamed ceramic is placed in the above-mentioned seal. It is held by the material 6. In addition, this ash collecting section 8 is used for a long period of time. It has sufficient volume to collect and contain ash.

[0016] With this exhaust gas purification system configured as described above, during the operation of a forklift, , the exhaust gas discharged from the diesel engine passes through the exhaust pipe and enters the inlet pipe 11. It is guided into the jacket 1 from a and reaches the DPF 2. At this time, the exhaust gas is DPF Particulates are collected by 2. The purified exhaust gas is then It is discharged to the atmosphere from the trett pipe 12a.

As the DPF 2 collects particulates, the back pressure increases, and the control unit 5 is activated by an input signal from the back pressure sensor 4 which has received a back pressure above a certain level corresponding to a predetermined amount of particulates collected by the DPF 2. The regeneration electric heater 3 is activated. The particulates are burned by the heat of the regeneration electric heater 3, and the DPF 2 is regenerated. At this time, ash mainly composed of CaSO ₄ and Fe ₂ O ₃ adheres to the cell wall surface of the DPF 2 due to Ca etc. in the engine oil. By appropriately operating a switch (not shown), a signal is sent to the control unit 5 to activate the ultrasonic oscillator 7. As a result, the ash adhering to the cell wall surface of the DPF 2 is shaken off and falls onto the ash collection section 8 installed below the DPF 2. The ash that has fallen and accumulated on the ash collecting section 8 enters the inside of the ash collecting section 8 due to the gas pressure of the exhaust gas during engine operation, and is restrained and stored within the ash collecting section 8.

[0018] Note that the inlet side of the DPF 2 is open and the outlet side is closed. Particulates are collected when the exhaust gas enters the cell and moves to the cell next to the cell. As a result, many particulates are trapped on the inner wall surface of the cell side where the inlet side is open. Therefore, most of the above ash is on the inner wall surface of the cell side where this inlet side is open. There is almost no adhesion to the inner wall surface of the cell whose inlet side is closed. this Therefore, the above-mentioned ash is surely shaken off from the DPF 2 by the above-mentioned ultrasonic oscillator 7. can be done.

[0019] As mentioned above, according to the exhaust gas purification device of this embodiment, the regeneration of the DPF2 Make sure to shake off the ash that is generated and accumulated on DPF2, and The ash shaken off from F2 is collected and stored in the ash collection section 8. be able to. For this reason, the inconvenience caused by the accumulation of ash on the DPF, i.e. Ensures the purification ability of the DPF by preventing increases in the required regeneration processing temperature and back pressure. It can actually be restored. In addition, the ash collecting section 8 is filled with ash. The ash collection section can be stored for several minutes, so even after long-term use, the ash collection section 8 is not required. Therefore, the exhaust gas purification device of this example can be used for a long period of time. It is now possible to use it without maintenance.

[0020] Note that in the above embodiment, the exhaust gas flows from the bottom to the top of the DPF 2. As explained above, if the end of the DPF is not blocked, it will be discharged from the top to the bottom. It is also possible to have a configuration in which air gas flows. In addition, in the above embodiment, an ultrasonic oscillator is used as the vibrator that applies vibration to the DPF 2. However, other mechanical vibrations such as periodically hitting the outer peripheral side of jacket 1 were used. Of course, it is also possible to employ means for imparting.

[0021]

[Effect of the idea]

As detailed above, in the diesel engine exhaust gas purification device of the present invention, the regeneration To ensure that ash generated by processing and deposited on the DPF is removed from the DPF. Therefore, it is possible to reliably recover the purification ability of the DPF.

[Brief explanation of drawings]

FIG. 1 is an overall schematic sectional view of an exhaust gas purification device according to the present embodiment.

FIG. 2 is a sectional view of a conventional exhaust gas purification device.

[Explanation of symbols]

1 is a jacket, 2 is a DPF (diesel particulate filter), 3 is an electric heater for regeneration, 7 is an ultrasonic oscillator constituting an exciter, and 8 is an ash collection section.

Claims (1)

[Scope of utility model registration request] Claim 1: A jacket through which exhaust gas passes; a diesel particulate filter disposed within the jacket to collect particulates in the exhaust gas; and a diesel particulate filter disposed within the jacket. In the exhaust gas purification device for a diesel engine, which includes a regeneration electric heater that burns and removes the collected particulates, the jacket applies vibration to the diesel particulate filter to remove the particulates by combustion. Exhaust gas purification for a diesel engine, comprising: an exciter that shakes off ash generated and deposited on the diesel particulate filter; and an ash collection section that collects the ash that has been shaken off. Device.