CN209621441U - A Diesel Engine Exhaust Particulate Capture and Active Regeneration System - Google Patents

Abstract

The utility model discloses a diesel engine tail gas particle capture and active regeneration system, which is used to treat the tail gas produced by automobile diesel engines. It is provided with a diesel pump assembly, a particle capture and active regeneration device, and communicates with the diesel pump assembly. The particulate trapping and active regeneration device is provided with an input terminal, a catalytic oxidizer, a particulate trap and an output terminal in turn. The diesel in the diesel engine is injected into the input terminal after being assembled by a diesel pump to form gas, and the gas passes through the catalytic oxidizer and the particulate filter. output after the trap. The system also has a good reduction effect on carbon monoxide and hydrocarbons. The DOC catalytic converter has a strong catalytic oxidation ability for CO and HC in the exhaust gas. Even at a low exhaust gas temperature, the purification ability of DOC for CO and HC can reach about 50%. When the exhaust gas temperature exceeds 240 ° C , DOC can remove all CO and more than 80% HC in the tail gas. There is no need to disassemble the DPF particle filter for regeneration, which saves a lot of manpower and material resources and improves the operating efficiency of the equipment.

Description

A Diesel Engine Exhaust Particulate Capture and Active Regeneration System

technical field

The utility model relates to the field of diesel engine tail gas purification treatment, in particular to a diesel engine tail gas particle collection and active regeneration system.

Background technique

At present, particulate matter traps are widely used in diesel engines, but the regeneration technology of particulate matter traps is not yet mature. Researchers at home and abroad have done a lot of meaningful work on the regeneration methods of particulate matter traps. Some methods have been applied in vehicles, but there is no recognized mature regeneration method yet. Previous researchers have proposed many regeneration methods from multiple perspectives, but there are certain deficiencies in all of them. For example, FBC fuel additive regeneration is a regeneration method to reduce the ignition point of particulate matter in diesel engine exhaust so that it can be burned at a lower temperature, but accurate addition of FBC and high requirements for fuel oil, and there are few channels for purchasing FBC fuel additive. Heating regeneration technology is a regeneration method that uses electric heating, microwave heating, infrared heating and other methods to increase the temperature of the trap or particulate matter to reach the ignition point of the particulate matter. This method generally has higher requirements for on-board batteries and may reduce the capture rate. The service life of the filter is high, and the cost is high; the reverse jet regeneration method uses high-pressure reverse air flow to blow off the particulate matter in the trap and burn it concentratedly. The non-combustible components in the DPF particle filter can be removed, but the cost of this method is high, the equipment occupies a large space, and the regeneration is not complete. Moreover, the passive regeneration method is widely used in China now, and carbon deposits are passively regenerated on the engine. It is necessary to dismantle the DPF particle filter to regenerate the heating furnace, which delays the operation of the equipment and consumes a lot of manpower and material resources.

Utility model content

The purpose of this utility model is to provide a diesel engine exhaust particle capture and active regeneration system that does not need to disassemble the DPF particle filter for regeneration and can effectively reduce the carbon monoxide and hydrocarbons produced by the diesel engine, so as to solve the problems raised in the above background technology. The problem.

In order to solve the above technical problems, the utility model provides the following technical solutions: a diesel engine exhaust particle capture and active regeneration system, which is used to treat the exhaust gas produced by automobile diesel engines, and is equipped with a diesel pump assembly, which is characterized in that: a particle capture It communicates with the active regeneration device and the diesel pump assembly. The particle trapping and active regeneration device is sequentially provided with an input end, a catalytic oxidizer, a particle trap and an output end. The gas is formed at the input end, and the gas is output after passing through the catalytic oxidizer and the particle filter.

Further, the input end of the particulate trapping and active regeneration device is provided with a metering nozzle, and the metering nozzle communicates with the diesel pump assembly through a diesel pipeline.

Further, the pipeline between the metering nozzle and the diesel pump assembly is provided with a diesel filter element.

Further, the particle trapping and active regeneration device is provided with a differential pressure sensor for detecting the differential pressure between the input end and the output end.

Further, exhaust temperature sensors are provided, which are respectively arranged at the input end, between the catalytic oxidizer and the particle trap, and at the output end.

Further, the diesel pump assembly is provided with a controller, and the controller is connected with the differential pressure sensor and the exhaust temperature sensor.

Further, the controller is connected with the generator in the diesel engine to collect the rotation speed signal of the generator.

Further, an air intake sensor after intercooling is electrically connected with the controller, and installed in the air intake pipe of the diesel engine after intercooling.

Compared with the prior art, the beneficial effects achieved by the utility model are:

1. The diesel engine exhaust particle capture and active regeneration system of the utility model has an engine soot replenishment efficiency greater than 95%, and has a good reduction effect on carbon monoxide and hydrocarbons. The DOC catalytic converter has a strong catalytic oxidation ability for CO and HC in the exhaust gas. Even at a low exhaust gas temperature, the purification ability of DOC for CO and HC can reach about 50%. When the exhaust gas temperature exceeds 240°C , DOC can remove all CO and more than 80% HC in the tail gas.

2. There is no need to disassemble the DPF particle filter for regeneration, which saves a lot of manpower and material resources and improves the operating efficiency of the equipment.

3. The system controller can control each component to complete the regeneration of the particulate filter, which is simple and reliable, with short regeneration time and fully automatic operation without human intervention, which is beneficial to prolong the life of the equipment and does not require high diesel quality.

4. The related equipment and control system are relatively simple, occupy a small space, and are easy to install. The controller only needs to judge the regeneration timing, the fuel injection timing and adjust the fuel injection flow according to the engine speed. The regeneration method has good fuel economy and is suitable for all diesel engines.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, and are used to explain the utility model together with the embodiments of the utility model, and do not constitute a limitation to the utility model. In the attached picture:

Figure 1 is a schematic diagram of the utility model diesel engine exhaust particle capture and active regeneration system

Among them, 1-particulate trapping and active regeneration device, 2-input end, 3-catalytic oxidizer, 4-particulate trap, 5-output end, 6-exhaust temperature sensor, 7-pressure differential sensor, 9-diesel Pump assembly, 10-diesel filter element, 11-auto fuel tank, 12-generator, 13-intake sensor after intercooler, 14-controller, 15-metering nozzle.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Fig. 1, the utility model provides a diesel engine exhaust particle capture and active regeneration system, the system mainly includes a diesel pump assembly 9, a particle capture and active regeneration device 1, a plurality of sensors and a controller 14, for Treat the exhaust gas produced by automobile diesel engines.

Please refer to Figure 1, the particle capture and active regeneration device is roughly columnar, with a channel for diesel flow in the middle. The particle trap is provided with an input 2 , a catalytic oxidizer 3 , a particle trap 4 and an output 5 in sequence. Wherein, the input end is provided with an inclined metering nozzle 15, diesel oil is injected into the input end to form gas, and the metering nozzle can collect relevant data of diesel injection. The catalytic oxidizer catalyzes the oxidation of diesel oil to increase the temperature of the engine exhaust gas to 600-700°C, making it reach the ignition point of the particulate matter in the particulate trap, and the particulate matter burns in the particulate trap, achieving the effect of regeneration of the particulate trap and reducing back pressure. In addition, the particulate trap is provided with a plurality of exhaust temperature sensors 6, which are respectively located at the input end, between the catalytic oxidizer and the particulate trap, and at the output end to collect exhaust gas exhaust temperatures at these locations.

Further, the pipeline between the metering nozzle and the diesel pump assembly is provided with a diesel filter element 10 to prolong the service life of the fuel injection pump and the diesel nozzle 15 .

Please refer to FIG. 1 , the sensors provided in the system further include an air intake sensor 13 after an intercooler and a differential pressure sensor 7 in addition to the exhaust temperature sensor 6 . Wherein, the air intake sensor after intercooling is installed on the air intake pipe of the diesel engine after intercooling to test the intake air temperature and pressure after intercooling; one end of the differential pressure sensor is connected to the input end, and the other end is connected to the output end, used to collect the pressure parameters in the input end and output end.

Referring to Fig. 1, the controller is installed in the diesel pump assembly to collect the signals of various sensors, and the controller is connected with the intake sensor, differential pressure sensor, multiple exhaust temperature sensors, generator 12, and metering nozzle through electric The line is connected to collect the pulse signal of the generator, the intake air temperature and pressure parameters after the intercooler, the exhaust back pressure in the exhaust pipe, the exhaust temperature, the catalyst temperature, the fuel injection volume and other parameters.

Please refer to Figure 1, when the exhaust gas enters the DOC catalytic oxidizer, the chemical reaction is as follows:

NO oxidation to NO ₂ :

2NO+O ₂ --→2NO ₂ ,

HC oxidation to CO ₂ and H ₂ O:

4HC+3O ₂ --→2CO ₂ +2H ₂ O,

CO oxidation reaction produces CO ₂ :

2CO+O ₂ --→ 2CO ₂ .

When the exhaust gas enters the DPF particle filter, the chemical reaction is as follows:

C _SOOT +NO ₂ --→CO+NO (250-450°C), C _SOOT +O ₂ --→2CO (>550°C).

When the system is working, the fuel tank 11 of the automobile is injected into the input end to form gas after passing through the diesel pump assembly, and the gas is output after passing through the DOC catalytic oxidizer and the DPF particulate filter. During the working process of the aftertreatment system of the DPF particle filter, the controller collects the pulse signal of the generator, the intake air temperature and pressure parameters after intercooling, the exhaust back pressure in the exhaust pipe, the exhaust temperature, and the catalytic converter. Temperature and other parameters to determine whether it is necessary to enter the DPF particle filter for regeneration. If the DPF particulate filter needs to be regenerated, the fuel injection quantity required at the current moment is calculated and converted into an injection pulse signal to control the action of the diesel pump and nozzle. Inject diesel oil before the DOC catalytic oxidizer, and rely on the DOC catalytic oxidizer to catalyze the oxidation of diesel to increase the engine exhaust temperature to 600-700°C, making it reach the ignition point of the particulate matter in the DPF particulate filter, and the particulate matter in the DPF particulate filter burns to reach DPF particle trap regeneration reduces the effect of back pressure.

Finally, it should be noted that: the above is only a preferred embodiment of the utility model, and is not intended to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art , it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (8)

1. a kind of Fractions of Diesel Engine Exhaust Particulates trapping and active regeneration system are equipped with to handle the tail gas of diesel engine of vehicle generation Diesel oil pump assembly a, it is characterised in that: granule capturing and active regeneration device are connected to diesel oil pump assembly, the granule capturing Input terminal is successively arranged with active regeneration device, and catalytic oxidizer, grain catcher and output end, the diesel oil in diesel engine is through bavin Input terminal formation gas is injected after oil pump assy, gas exports after catalytic oxidizer and grain catcher.

2. a kind of Fractions of Diesel Engine Exhaust Particulates trapping according to claim 1 and active regeneration system, it is characterised in that: described The input terminal of granule capturing and active regeneration device is equipped with measuring jet, and the measuring jet and the diesel oil pump assembly pass through bavin Oil pipe line connection.

3. a kind of Fractions of Diesel Engine Exhaust Particulates trapping according to claim 2 and active regeneration system, it is characterised in that: described Pipeline between measuring jet and diesel oil pump assembly is equipped with diesel-oil filter element.

4. a kind of Fractions of Diesel Engine Exhaust Particulates trapping according to claim 1 and active regeneration system, it is characterised in that: particle Trapping is equipped with differential pressure pickup with active regeneration device, to the pressure difference between detection input and output end.

5. a kind of Fractions of Diesel Engine Exhaust Particulates trapping according to claim 4 and active regeneration system, it is characterised in that: be equipped with Exhaust temperature sensor, is respectively arranged between input terminal, catalytic oxidizer and grain catcher and output end.

6. a kind of Fractions of Diesel Engine Exhaust Particulates trapping according to claim 5 and active regeneration system, it is characterised in that: described Diesel oil pump assembly is equipped with controller, and controller is connect with differential pressure pickup and exhaust temperature sensor.

7. a kind of Fractions of Diesel Engine Exhaust Particulates trapping according to claim 6 and active regeneration system, it is characterised in that: control Device is connect with the generator in diesel engine, to acquire the tach signal of the generator.

8. a kind of Fractions of Diesel Engine Exhaust Particulates trapping according to claim 7 and active regeneration system, it is characterised in that: in one It is cold after inlet sensor module be electrically connected with the controller, and be installed on it is cold in diesel engine after air inlet pipe.