CN115853619A - A burner system suitable for exhaust gas treatment of diesel engines in use - Google Patents

Abstract

The invention discloses a burner system suitable for treating the tail gas of an in-use diesel engine. The burner is a cylindrical structure, with a mixed combustion device at the front end, a DOC catalytic converter and a CDPF catalytic converter radially filled in the middle, and a fireproof end cover at the rear end. The system of the present invention can better solve the exhaust gas treatment of a large number of in-use diesel engines with bad emissions, low exhaust temperature and complicated operating conditions on the market; the burner device is designed with a premixing chamber and a combustion chamber, which helps to improve the fuel utilization rate The tail end cover adopts a fireproof cap structure to prevent safety accidents caused by the leakage of high-temperature substances such as sparks that occur in the oxidative combustion of soot; the use of air-assisted nozzles to inject fuel oil helps fuel atomization and mixing; at the same time, the present invention does not require a large number of The thermal management calibration between the diesel engine and the after-treatment system, the after-treatment thermal management calibration is relatively independent, and the system products have the characteristics of installation and arrangement, simple use, and convenient maintenance.

Description

A burner system suitable for exhaust gas treatment of diesel engines in use

technical field

The invention relates to the technical field of diesel engine tail gas purification, in particular to a burner system suitable for diesel engine tail gas treatment.

Background technique

Diesel engine exhaust emissions mainly include particulate matter and other harmful substances, which are more harmful to human health and air pollution; with the tightening of air pollution control policies, exhaust purification of diesel machinery in use is particularly important. At present, there are still a large number of non-road diesel machinery with bad emissions on the market. This type of machinery has the characteristics of low exhaust temperature and complicated operating conditions, which is not conducive to the treatment of harmful substances such as particulate matter in exhaust gas.

Contents of the invention

According to the deficiencies of the prior art, the invention discloses a burner system suitable for treating exhaust gas of diesel engines in use. The purpose of the present invention is to provide a combustor combined with a DOC catalytic converter and a CDPF catalytic converter to treat harmful substances such as particulate matter in the exhaust gas; at the same time, through the monitoring terminal and the monitoring platform, the operating status of the burner system and the purification of the exhaust gas can be monitored to further ensure the system Normal operation and improve the effect of exhaust gas treatment.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A burner system suitable for exhaust gas treatment of diesel engines in use. The burner has a cylindrical structure. The front end of the cylindrical structure is equipped with a mixed combustion device, the middle part is radially filled with DOC catalytic converters and CDPF catalytic converters, and the rear end is a fireproof cap. ;

The mixed burner device includes an oil-gas premix chamber, a combustion chamber and an exhaust gas inlet. The exhaust gas inlet is provided with the side wall of the combustion chamber, and the exhaust gas inlet is provided with a mass flow meter to obtain the exhaust gas flow. The fuel pump and the air pump are connected in parallel with the air-assisted nozzle, and the outlet of the air-assisted nozzle Set on the oil-gas premixing chamber at the front end of the combustion chamber ignition device; the front and rear ends of the DOC catalyst are respectively equipped with a burner outlet temperature sensor and a CDPF inlet temperature sensor; Sensor; the rear outlet is provided with a particle sensor sensor;

Fuel pumps, air pumps, mass flow meters, temperature sensors, differential pressure sensors, and particulate matter sensors are all connected to the monitoring system.

Further, the monitoring system includes a controller, a monitoring terminal, and a computer monitoring platform; the controller is connected to the monitoring terminal, and the monitoring terminal is connected to the computer monitoring platform through a wireless network.

Further, the mixed burner device, the DOC catalytic converter, the CDPF catalytic converter, and the end cover of the fire protection cap are connected by hoops and flanges to form a cylindrical structure.

Further, a flame/spark baffle is designed inside the fireproof cap tail end cap device.

Further said controller is used to collect the output signals of fuel pump, air pump, ignition device, mass flow meter, burner outlet temperature sensor, CDPF inlet temperature sensor, CDPF differential pressure sensor, CDPF outlet temperature sensor and carry out processing and numerical analysis, calculate The amount of fuel injection drives the fuel pump, air pump, air-assisted nozzle and ignition device to work, controls the temperature of the CDPF inlet, etc., and realizes CDPF catalytic converter regeneration and exhaust gas purification.

Further, the monitoring terminal is used to monitor the system operation status and exhaust gas purification status, display the system operation status and parameter values on the monitoring terminal, and meanwhile, the monitoring terminal uploads the data to the computer monitoring platform through the wireless network.

The operating principle of the burner applicable to exhaust gas treatment of diesel machinery in the present invention includes: the control system judges the timing of CDPF regeneration through the two dimensions of CDPF pressure difference and diesel engine running time, and takes the maximum value of the two calculation results. When the particulate matter captured by CDPF reaches a certain value and the regeneration demand is activated, the control system controls the fuel pump, air pump and air-assisted nozzle to inject fuel into the mixing burner device, and the fuel is fully mixed in the mixing burner device and ignited by the ignition device Combustion increases the temperature of the exhaust gas, and the high-temperature exhaust gas enters the DOC catalytic converter and the CDPF catalytic converter successively to promote the oxidation and combustion reaction of the particulate matter in the CDPF and realize the regeneration of the CDPF.

The specific operation method of the system: the control system recognizes that the pressure difference of the CDPF exceeds the maximum pressure difference threshold, or the system running time from the last CDPF regeneration exceeds the threshold, and then triggers a judgment; if the judgment result satisfies: the battery voltage detection value is higher than the minimum threshold, the temperature If the sensor, pressure difference sensor, fuel pump, air pump, and ignition device have no faults, the controller will send out a signal, the alarm indicator on the monitoring terminal will be on and an alarm will sound, reminding the staff that the CDPF needs to be regenerated and the system has the regeneration conditions, and the staff will turn on the monitoring The regeneration switch on the terminal, the system enters the CDPF regeneration state; the regeneration time is reset and the timing starts, the fuel pump and the air pump work, the controller controls the fuel injection quantity of the diesel nozzle by adjusting the fuel pump, the air pump, etc., and the fuel is in the burner device Fully mix and ignite and burn through the ignition device to increase the temperature of the exhaust gas. The high-temperature exhaust gas enters the DOC catalyst and the CDPF catalyst successively to promote the oxidation and combustion reaction of the particles in the CDPF and realize the regeneration of the CDPF. At the same time, the control system performs PI adjustment on the fuel injection quantity according to the CDPF inlet temperature and outlet temperature, and controls the CDPF inlet temperature and outlet temperature not to exceed the maximum threshold. During the CDPF regeneration process, the control system continuously monitors the state of the system. If it detects that: CDPF inlet temperature and outlet temperature exceed the maximum temperature threshold, or the battery voltage detection value is lower than the minimum threshold, the temperature sensor, pressure difference sensor, fuel pump, air pump and If the ignition device is faulty, the CDPF regeneration will be interrupted, the fuel injection will be stopped, and the regeneration indicator light will go out.

The present invention provides a burner system and its operating method suitable for exhaust gas treatment of in-use diesel engines. The system of the present invention can better solve the problem of a large number of in-use diesel engines with bad emissions, low exhaust gas temperature and complicated operating conditions on the market. Exhaust gas treatment; the burner device is designed with a premixing chamber and a combustion chamber, which helps to improve fuel utilization; the tail end cover adopts a fireproof cap structure to prevent safety accidents caused by the leakage of high-temperature substances such as sparks that occur in the oxidative combustion of soot; gas-assisted The nozzle injects fuel, which is helpful for fuel atomization and mixing; at the same time, the present invention does not require a large number of thermal management calibrations between the diesel engine and the after-treatment system, and the after-treatment thermal management calibration is relatively independent, and the system product has an installation arrangement and is easy to use , Easy maintenance and so on.

Description of drawings

Fig. 1 is a schematic diagram of the composition of the burner system of the present invention.

Among them, 01 is the controller, 02 is the fuel pump, 03 is the air pump, 04 is the gas-assisted nozzle, 05 is the ignition device, 06 is the mass flow meter, 07 is the burner outlet temperature sensor, 08 is the CDPF inlet temperature sensor, and 09 is CDPF differential pressure sensor, 10 is CDPF outlet temperature sensor, 11 is particle sensor sensor, 12 is monitoring terminal, 13 is computer monitoring platform, 14 is mixed burner device, 15 is DOC catalytic converter, 16 is CDPF catalytic converter, 17 is fire protection Cap end cap.

Detailed ways

The present invention is further described below in conjunction with specific embodiment, and specific embodiment is the further description of the principle of the present invention, does not limit the present invention in any way, and the identical or similar technology of the present invention all does not exceed the scope of protection of the present invention.

The present invention is a kind of burner system suitable for treating the exhaust gas of diesel engines in use. The burner is a cylindrical structure. The front end of the cylindrical structure is provided with a mixing combustion device 14, and the middle part is radially filled with a DOC catalytic converter 15 and a CDPF catalytic converter 16. The rear end is a Fireproof cap tail end cover 17.

The burner system includes controller 01, fuel pump 02, air pump 03, air-assisted nozzle 04, ignition device 05, mass flow meter 06, burner outlet temperature sensor 07, CDPF inlet temperature sensor 08, CDPF differential pressure sensor 09, CDPF outlet Temperature sensor 10, particulate matter sensor 11, burner device 14, DOC catalytic converter 15, CDPF catalytic converter 16, fireproof cap end cap device 17; monitoring system includes controller 01, monitoring terminal 12, computer monitoring platform 13.

One end of the fuel pump 02 and the air pump 03 are connected to the air-assisted nozzle 04 , and one end of the air-assisted nozzle 04 and the ignition device 05 is installed and fixed to the mixing burner device 14 .

Mass flowmeter 06, burner outlet temperature sensor 07, CDPF inlet temperature sensor 08, CDPF differential pressure sensor 09, CDPF outlet temperature sensor 10, and particle sensor 11 are installed and fixed to the burner device 14, DOC catalytic converter 15, and CDPF catalytic converter respectively. Device 16, fireproof cap tail end cover 17.

The mixing burner device 14, the DOC catalytic converter 15, the CDPF catalytic converter 16, and the end cover device 17 of the fireproof cap are connected by hoops, flanges or other methods.

Fuel pump 02, air pump 03, ignition device 05, mass flow meter 06, burner outlet temperature sensor 07, CDPF inlet temperature sensor 08, CDPF differential pressure sensor 09, and the other end of CDPF outlet temperature sensor 10 are connected to the controller.

The other end of the particle sensor 11 and the controller 01 are connected to a monitoring terminal 12, and the monitoring terminal 12 is connected to a computer monitoring platform 13 through a wireless network.

The inside of the burner device 14 is designed with an oil-gas premixing chamber and a combustion chamber, which is conducive to the complete mixing and combustion of fuel.

Flame/spark baffles are designed inside the fireproof cap tail end cover 17 to prevent the leakage of high-temperature substances such as sparks that occur in the oxidative combustion of soot and cause safety accidents.

The controller 01 processes the output signals of the fuel pump 02, the air pump 03, the ignition device 05, the mass flow meter 06, the burner outlet temperature sensor 07, the CDPF inlet temperature sensor 08, the CDPF differential pressure sensor 09, and the CDPF outlet temperature sensor 10. Numerical analysis, calculation of fuel injection quantity, etc., drive fuel pump 02, air pump 03, air-assisted nozzle 04, ignition device 05 to work, control the temperature at the inlet of CDPF catalytic converter 16, and achieve the purpose of CDPF catalytic converter regeneration and exhaust gas purification.

The monitoring system mainly monitors the system operation status and exhaust gas purification status, and displays the system operation status and parameter values on the monitoring terminal 12. At the same time, the monitoring terminal 12 uploads the data to the computer monitoring platform 13 through the wireless network, and the system can be viewed remotely through the computer monitoring platform 13. The real-time operation record of the equipment is helpful for the long-term operation and health monitoring of the system products.

The present invention is applicable to the operation method of the burner system for treating the exhaust gas of the diesel engine, and specifically includes: the controller 01 recognizes that the pressure difference of the CDPF exceeds the maximum pressure difference threshold, or the system operation time since the last CDPF regeneration exceeds the threshold, and then triggers the judgment; If the judgment result is satisfied: the battery voltage detection value is higher than the minimum threshold, and the temperature sensor, the CDPF differential pressure sensor 09, the fuel pump 02, the air pump 03, and the ignition device 05 have no faults, then the controller sends a signal, and the alarm indicator light of the monitoring terminal 12 is on and An alarm sound is issued to remind the staff that the CDPF needs to be regenerated and the system has the regeneration conditions. The staff presses the regeneration switch on the monitoring terminal 12 for a long time, and the system enters the CDPF regeneration state; The fuel injector controls the fuel injection volume of the diesel nozzle by adjusting the fuel pump, air pump, etc. The fuel is fully mixed in the burner device and ignited and burned by the ignition device to increase the temperature of the exhaust gas. The high-temperature exhaust gas enters the DOC catalyst and the CDPF catalyst successively to promote the CDPF Particulate matter undergoes oxidative combustion reaction to realize CDPF regeneration. At the same time, the controller performs PI adjustment on the fuel injection quantity according to the inlet temperature and outlet temperature of the CDPF catalyst, and controls the inlet temperature and outlet temperature of the CDPF catalyst not to exceed the maximum threshold. During the CDPF regeneration process, the controller continuously monitors the state of the system. If it detects that: the inlet temperature and outlet temperature of the CDPF catalyst exceed the maximum temperature threshold, or the battery voltage detection value is lower than the minimum threshold, the temperature sensor, CDPF differential pressure sensor, fuel pump , air pump and ignition device are faulty, the CDPF regeneration will be interrupted, the fuel injection will be stopped, and the regeneration indicator light will go out.

Claims (6)

1. The utility model provides a combustor system suitable for administer with diesel engine tail gas which characterized in that: the combustor is of a cylindrical structure, the front end of the cylindrical structure is provided with a mixed combustion device, the middle part of the cylindrical structure is radially filled with a DOC (catalyst oxidation catalyst) and a CDPF (continuous catalytic reduction) catalyst, and the rear end of the cylindrical structure is provided with a fire-proof cap tail end cover;

the mixed burner device comprises an oil-gas premixing cavity, a combustion cavity and a tail gas inlet, wherein the tail gas inlet is formed in the side wall of the combustion cavity, a mass flow meter is arranged at the tail gas inlet and used for obtaining the flow of tail gas, a fuel pump and an air pump are connected in parallel with an air-assisted nozzle, and an outlet of the air-assisted nozzle is formed in the oil-gas premixing cavity at the front end of an ignition device of the combustion cavity; the front end and the rear end of the DOC catalyst are respectively provided with a combustor outlet temperature sensor and a CDPF inlet temperature sensor; the front end and the rear end of the CDPF catalyst are respectively provided with a CDPF differential pressure sensor, and the rear end of the CDPF catalyst is provided with a CDPF outlet temperature sensor; a particle sensor is arranged at the outlet of the rear end;

the fuel pump, the air pump, the mass flowmeter, the temperature sensors, the differential pressure sensor and the particulate matter sensor are all in control connection with the monitoring system.

2. The burner system suitable for diesel exhaust remediation of claim 1, wherein: the monitoring system comprises a controller, a monitoring terminal and a computer monitoring platform; the controller is connected with the monitoring terminal, and the monitoring terminal is connected with the computer monitoring platform through a wireless network.

3. The burner system suitable for diesel exhaust remediation of claim 1, wherein: the mixed burner device, the DOC catalyst, the CDPF catalyst and the tail end cover of the fire-proof cap are connected through the anchor ear and the flange to form a cylindrical structure.

4. The burner system suitable for diesel exhaust remediation of claim 1, wherein: and a flame/spark baffle is designed in the tail end cover device of the fire-proof cap.

5. The burner system suitable for diesel exhaust remediation of claim 1, wherein: the controller is used for collecting output signals of the fuel pump, the air pump, the ignition device, the mass flowmeter, the burner outlet temperature sensor, the CDPF inlet temperature sensor, the CDPF differential pressure sensor and the CDPF outlet temperature sensor, processing and performing numerical analysis, calculating fuel injection quantity, driving the fuel pump, the air-assisted nozzle and the ignition device to work, controlling the temperatures of the CDPF inlet and the like, and realizing regeneration and tail gas purification of the CDPF catalyst.

6. The burner system suitable for diesel exhaust remediation of claim 2, wherein: the monitoring terminal is used for monitoring the running state and the tail gas purification state of the system, displaying the running state and the parameter values of the system on the monitoring terminal, and simultaneously uploading data to the computer monitoring platform through a wireless network.

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