CN212376719U - Plug-in type multi-stage mixed DPF burner - Google Patents

Abstract

The utility model discloses a bayonet multistage DPF combustor that mixes, including combustor urceolus and multistage combustion chamber, multistage combustion chamber includes installs interior combustion chamber and the back combustion chamber in the combustor urceolus according to the exhaust flow direction order, is provided with first end cover on the interior combustion chamber, sets up the nozzle on the first end cover, is provided with on the section of thick bamboo wall of combustor urceolus and stretches into inside spouting material pipe and ignition ware from the outside, spouts material pipe and nozzle connection and to jet fuel in the interior combustion chamber, during the ignition head of ignition ware stretches into the interior combustion chamber, the tail end of back combustion chamber is provided with the fire blocking net. Above-mentioned bayonet multistage mixed DPF combustor utilizes surplus oxygen in the diesel engine exhaust to mix burning with the fuel, has cancelled the air-blower to adopt multistage combustion chamber to make exhaust and fuel form the multiple mixing, increased mixing space between them, prolonged the time of mixing burning, make fuel and the surplus oxygen intensive mixing in the exhaust, improve combustion efficiency, reach complete combustion, effectively improve exhaust temperature.

Description

Plug-in type multi-stage mixed DPF burner

Technical Field

The utility model relates to a combustor structure of diesel engine granule entrapment system, especially bayonet multistage DPF combustor that mixes.

Background

With the national emphasis on environmental protection, exhaust gas treatment equipment is required to be installed on internal combustion engine vehicles and off-road mobile machines to purify pollutants in exhaust gas. One of the major exhaust pollutants for diesel engines is exhaust particulates, and it has become common to install a particulate trap (DPF) system to remove the exhaust particulates. For a DPF system, a regeneration mode is one of important functions, and one of the main regeneration modes is to heat exhaust gas of a diesel engine by using an insertion type combustor so that the exhaust gas temperature reaches a temperature required by oxidation combustion of particulate matters, and then the particulate matters are removed.

The plug-in DPF burner is used for inserting the DPF burner between an exhaust pipe of a diesel engine and a DPF catcher, fuel is sprayed into the DPF burner for burning, exhaust of the diesel engine is heated, exhaust temperature reaches preset temperature, and then trapped particles on the DPF catcher are oxidized and burned to remove the particles.

The existing plug-in DPF burner generally adopts an oil pump to spray fuel, then a blower is used to blow in fresh air to mix with the fuel, the mixture is ignited and burnt, and the burnt high-temperature gas is mixed with the diesel engine exhaust to improve the exhaust temperature. The combustor needs to be noticed that enough fresh air needs to be provided, so that the fuel and the fresh air can be sufficiently mixed and combusted in the combustion chamber, and the combustor needs to be provided with a large enough blower, so that the combustor is high in cost, large in size and inconvenient to install and arrange.

However, modern diesel engines employ higher excess air ratios for improved fuel economy and reduced emissions, and therefore, higher residual oxygen content in the diesel exhaust. Due to the working characteristics of the diesel engine, under the low-load working condition that the DPF burner is needed to be heated most, the lower the load is, the higher the residual oxygen content in the exhaust gas is, particularly under the idling condition of the diesel engine, the residual oxygen content in the exhaust gas can reach 90% of the fresh air, and the requirements of combustion supporting of the DPF burner and oxidation combustion of particulate matters trapped on the DPF trap can be completely met.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a bayonet multistage DPF combustor that mixes simplifies current DPF combustor structure, gets rid of the air-blower setting, considers the surplus oxygen in the make full use of diesel engine exhaust, and the fuel that spouts into the combustor is direct to mix the burning with the diesel engine exhaust to improve exhaust temperature, reduce the energy consumption.

In order to achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a bayonet multistage DPF combustor that mixes, it includes combustor urceolus and multistage combustion chamber, multistage combustion chamber includes installs interior combustion chamber and the afterburning room in the combustor urceolus according to exhaust flow direction order, be provided with first end cover on the interior combustion chamber, set up the nozzle on the first end cover, be provided with on the section of thick bamboo wall of combustor urceolus and stretch into inside spouting material pipe and firearm from the outside, spout material pipe and nozzle connection and jet fuel in to interior combustion chamber, the ignition head of firearm stretches into in the interior combustion chamber, the tail end of afterburning room is provided with the fire blocking net.

Particularly, the first end cover is provided with an air inlet, and residual oxygen in exhaust is utilized to support combustion.

In particular, when compressed air is introduced into the material spraying pipe to assist spraying, an air inlet hole is not needed on the first end cover.

Particularly, at least a second-stage combustion chamber is arranged between the inner combustion chamber and the rear combustion chamber, a second end cover is arranged on the second-stage combustion chamber and fixed on the outer wall of the inner combustion chamber, air holes are formed in the second end cover, and injected fuel is mixed with exhaust gas and combusted in each-stage combustion chamber.

Particularly, an opening hole is formed in the inner combustion chamber, an installation seat extending to the opening hole is arranged on the wall of the outer cylinder of the combustor, and the igniter is installed on the installation seat.

In particular, the igniter employs an ignition glow plug or a high voltage pulse ignition electrode.

In particular, the fire retardant net adopts a spherical surface shape or a flat plate shape.

In particular, the fire screen is fixed to the outer wall of the post combustor by brackets.

In particular, the wall of the post-combustion chamber is provided with lateral holes.

To sum up, the beneficial effects of the utility model are that, compare with prior art, bayonet multistage mixed DPF combustor utilizes surplus oxygen and fuel co-combustion in the diesel engine exhaust, has cancelled the air-blower to adopt multistage combustion chamber to make exhaust and fuel form the multiple mixing, increased mixing space between them, prolonged the time of co-combustion, make fuel and the surplus oxygen intensive mixing in the exhaust, improve combustion efficiency, reach complete combustion, effectively improve exhaust temperature.

Drawings

Fig. 1 is a schematic structural diagram of a plug-in multi-stage hybrid DPF burner provided in embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of a plug-in multi-stage hybrid DPF burner provided in embodiment 2 of the present invention;

fig. 3 is a schematic structural diagram of an insertion type multistage mixing DPF burner provided in embodiment 3 of the present invention.

Detailed Description

The technical solution of the present invention will be clearly and completely described with reference to the accompanying drawings.

Example 1:

referring to fig. 1, the present embodiment provides a plug-in multi-stage mixing DPF burner, which includes a burner outer barrel 1 and a multi-stage combustion chamber located in the burner outer barrel 1.

The front end of the burner outer cylinder 1 is connected with a diesel engine exhaust pipe, and the rear end is connected with a DPF catcher.

It should be noted that, because the residual oxygen content in the diesel exhaust 19 is lower than that of fresh air, complete combustion cannot be achieved easily in the original one-time mixed combustion, the combustion efficiency is low, and the combustion is unstable, so that multiple times of mixing of the exhaust 19 and the fuel 20 is achieved by using a multi-stage combustion chamber to help complete combustion. The number of the combustion chambers is preferably not less than 2, in the embodiment, the multi-stage combustion chambers comprise an inner combustion chamber 2, a second-stage combustion chamber 3, a third-stage combustion chamber 4 and a rear combustion chamber 5, and the combustion chambers are sequentially arranged in the outer cylinder 1 of the combustor in the flowing direction of the exhaust 19 and are coaxially arranged.

Be provided with first end cover 6 on the interior combustion chamber 2, set up nozzle 7 on the first end cover 6, be provided with on the section of thick bamboo wall of combustor urceolus 1 and stretch into inside spouting material pipe 8 and igniter 9 from the outside, spout material pipe 8 and nozzle 7 and be connected and to high pressure injection fuel 20 in the interior combustion chamber 2, the inlet port 10 has been seted up on the first end cover 6, utilizes remaining oxygen in the exhaust 19 to carry out combustion-supporting. The ignition head of the igniter 9 extends into the inner combustion chamber 2, an opening hole 11 is formed in the inner combustion chamber 2, an installation seat 12 extending to the opening hole 11 is arranged on the wall of the outer combustor cylinder 1, the igniter 9 is installed on the installation seat 12, and the igniter 9 adopts an ignition glow plug or a high-voltage pulse ignition electrode or other ignition appliances.

The second-stage combustion chamber 3 is provided with a second end cover 13, the second end cover 13 is fixed on the outer wall of the inner combustion chamber 2, similarly, the third-stage combustion chamber 4 is provided with a third end cover 14, the third end cover 14 is fixed on the outer wall of the second-stage combustion chamber 3, the second end cover 13 and the third end cover 14 are provided with air holes 15, and the injected fuel 20 is mixed with exhaust 19 in each stage of combustion chamber for combustion.

The wall of the rear combustion chamber 5 is provided with a side hole 16, and the outer wall of the rear end is provided with a fire-retardant net 18 through a bracket 17, the space between the fire-retardant net 18 and the rear combustion chamber 5 is called fire-retardant space, and the fire-retardant net 18 is preferably spherical to increase the fire-retardant space.

The diesel engine exhaust 19 enters from the front end of the burner outer cylinder 1 and then respectively enters the inner combustion chamber 2 from the air inlet hole 10 on the first end cover 6; enters the secondary combustion chamber 3 from the air holes 15 on the second end cover 13; the air enters the tertiary combustion chamber 4 from the air holes 15 and the side holes 16 on the third end cover 14; entering the afterburner 5 from the side holes 16 of the afterburner 5; from the space between the fire barrier screen 18 and the afterburner 5 into the fire barrier space and finally out of the burner through the fire barrier screen 18. At the same time, part of the exhaust gas 19 flows directly out of the burner from the outermost turn in the burner jacket 1.

The fuel 20 used by the burner enters the nozzle 7 from the material spraying pipe 8 and is sprayed out from the nozzle 7, and the sprayed fuel 20 sequentially passes through the inner combustion chamber 2, the igniter 9, the secondary combustion chamber 3, the tertiary combustion chamber 4, the rear combustion chamber 5 and the fire retardant space.

In the inner combustion chamber 2, part of the fuel 20 is mixed with the exhaust gas 19 entering the inner combustion chamber 2, the mixture is ignited by the igniter 9 to form a flame kernel, the flame kernel and the fuel 20 which is not ignited move backwards continuously according to the injection inertia, the fuel 20 is continuously mixed with the exhaust gas 19 in the subsequent secondary combustion chamber 3, the tertiary combustion chamber 4, the rear combustion chamber 5 and the fire retardant space, and the flame kernel continuously expands to form comprehensive combustion; after a small amount of fuel 20 reaches the screen 18, it is blocked by the screen 18 from continuing to burn in the fire-retarding space. The burning flame is basically blocked by the fire-retardant net 18, and the high-temperature gas after burning flows through the fire-retardant net 18 to be mixed with the residual exhaust gas 19 which does not participate in the burning, so that the temperature of the exhaust gas 19 is increased.

Example 2:

referring to fig. 2, this embodiment provides a plug-in multi-stage hybrid DPF burner based on embodiment 1, which is different from embodiment 1 in that fuel 20 is not directly injected at high pressure, but injected with compressed air for assisting injection, so that the mixture 21 of fuel 20 and compressed air is injected into the inner combustion chamber 2 from the injection pipe 8 and the nozzle 7, and the compressed air is fresh air and can be used as combustion-supporting gas. However, the flow rate of the compressed air is small, which only can meet the combustion requirement of a small part of the fuel 20 and can only be used as combustion supporting of the inner combustion chamber 2, so that the air inlet hole on the first end cover 6' can be reduced or even eliminated.

The advantages of this structure are: the compressed air is adopted to assist the fuel 20 to jet, so that the requirement on a fuel pump is greatly reduced, and the cost can be reduced. Meanwhile, the diameter of the spray hole of the nozzle 7 can be properly increased, so that the blockage is reduced, and the working reliability is improved.

Example 3:

referring to fig. 3, this embodiment provides an insertion type multi-stage mixed DPF burner based on embodiment 1 or 2, except that the fire-retardant net 18' is a flat plate, so as to reduce the process difficulty, facilitate production, and not affect the basic function of flame-blocking.

In conclusion, the plug-in type multistage mixed DPF burner utilizes the residual oxygen in the exhaust gas of the diesel engine to be mixed and combusted with the fuel, the air blower is omitted, the multistage combustion chamber is adopted to enable the exhaust gas and the fuel to be mixed for multiple times, the mixing space between the exhaust gas and the fuel is increased, the mixed combustion time is prolonged, the fuel and the residual oxygen in the exhaust gas are fully mixed, the combustion efficiency is improved, the complete combustion is achieved, and the exhaust temperature is effectively improved.

The above embodiments have been merely illustrative of the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and does not depart from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. The utility model provides a DPF combustor is mixed to bayonet multistage, its characterized in that, includes combustor urceolus and multistage combustion chamber, multistage combustion chamber include according to exhaust flow direction order install in interior combustion chamber and afterburning room in the combustor urceolus, be provided with first end cover on the interior combustion chamber, set up the nozzle on the first end cover, be provided with on the section of thick bamboo wall of combustor urceolus and stretch into inside spouting material pipe and the firearm from the outside, spout the material pipe with the nozzle is connected and sprays fuel in to interior combustion chamber, the ignition head of firearm stretches into in the interior combustion chamber, the tail end of afterburning room is provided with the fire blocking net.

2. The plug-in multi-stage hybrid DPF burner of claim 1, wherein: and the first end cover is provided with an air inlet, and residual oxygen in exhaust is utilized to support combustion.

3. The plug-in multi-stage hybrid DPF burner of claim 2, wherein: when compressed air is introduced into the material spraying pipe for auxiliary spraying, an air inlet hole is not needed on the first end cover.

4. The plug-in multi-stage hybrid DPF burner of claim 1, wherein: the internal combustion chamber and the after-combustion chamber are at least provided with a second-stage combustion chamber, the second-stage combustion chamber is provided with a second end cover, the second end cover is fixed on the outer wall of the internal combustion chamber, the second end cover is provided with air holes, and sprayed fuel is mixed and combusted with exhaust in each stage of combustion chamber.

5. The plug-in multi-stage hybrid DPF burner of claim 1, wherein: the inner combustion chamber is provided with an opening hole, the wall of the outer cylinder of the burner is provided with a mounting seat extending to the opening hole, and the igniter is mounted on the mounting seat.

6. The plug-in multi-stage hybrid DPF burner of claim 1, wherein: the igniter adopts an ignition glow plug or a high-voltage pulse ignition electrode.

7. The plug-in multi-stage hybrid DPF burner of claim 1, wherein: the fire-retardant net adopts a spherical surface shape or a flat plate shape.

8. The plug-in multi-stage hybrid DPF burner of claim 1, wherein: the fire retardant net is fixed on the outer wall of the rear combustion chamber through a bracket.

9. The plug-in multi-stage hybrid DPF burner of claim 1, wherein: and a side surface hole is formed in the wall of the post combustion chamber.

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