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XSQ Double Intensified Ignition

key word:Heat exchange element

Category:


Product description

XSQ Double Intensified Ignition system and burner

 

1. Code illustration 

        XSQ-** ## - @@/&& 

        X---- MFG code: XCC

        SQ----- Product code: Double intensified less oil ignition device

        **------- Code of composed type: 1- Intersecting; 2- Coaxial; 3. Mixed

         ##------Oil burner quantity

         @@-----Total output of oil burner
         &&-----Nominal output of pulverized coal burner

       Code example:
Oil burner and pulverized coal burner intersection installation, 2 oil burners, single oil burner total output 300Kg/h, pulverized coal burner output 8t/h, XCC Research Institute Co., Ltd. production of pulverized coal less oil double intensified ignition device and its model code: XSQ-1-2-300/8 type.

 

2. Technical data

 

Item Parameter
Pulverized coal burner output t/h 2~20
Oil burner caliber mm 89~245
Oil burner total output Q kg/h 20~600
Key parts materials  Temperature resistant parts  Temperature resistant1000
Wear-resistant parts  HardnessHRc30
Working environment  Temperature -10~65℃
Relative humidity 45~80%
Altitude  ≤2000m

 

3. Principle of double-intensity less oil ignition burner


The oil burner originated from the aviation engine technology is arranged in the center of the pulverized coal burner or in the back of the pulverized coal burner diagonally inserted, when ignited, the high temperature oil flame of intensified combustion will be instantly heated through the pulverized coal burner to the ignition temperature of the pulverized coal, and the pulverized coal mixture is subjected to high-temperature flame, and the volatile matter is rapidly precipitated and starts to burn at the same time, and the combustion of volatile matter releases a large amount of heat, which further heats the pulverized coal to much higher than the ignition temperature of the coal species. The combustion of volatile components releases a lot of heat, which further heats the primary air powder to a temperature much higher than the ignition temperature of the coal, so that the carbon particles in the coal powder start to burn, forming a high-temperature torch injection into the furnace. Due to the rapid heating of the pulverized coal in a very short period of time, the amount of volatile matter precipitated will be much higher than the actual volatile matter content, which further improves the combustion speed of the pulverized coal, and thus the combustion rate of the pulverized coal is extremely high.
The research area of this product involves a low-pressure forced-air oil burner, which was developed from the high-pressure forced-air oil burner of an aero-engine. By means of forced air distribution and adiabatic combustion, it emits a high-temperature flame, with a flame center temperature of up to 1,800°C and an oil burnout rate of over 99%. When designing, the capacity of oil burner is determined according to different coal quality and load of pulverized coal burner, and the pulverized coal will be instantly ignited through the high temperature flame within the specified temperature index to meet the ignition requirements of pulverized coal internal combustion technology.

 

4. Composition of double-strength less oil ignition system


Double-strength oil less ignition system consists of double-strength pulverized coal burner, double-strength oil burner, double-strength fuel oil and blowing system, double-strength oil air distribution system, monitoring system, control system and other components. The functions of each system and equipment are described as follows:
 

4.1 Double-strength pulverized coal burner
It is used for matching with double-strength oil burner to ignite coal powder in the combustion cylinder of double-strength pulverized coal burner.
The burners are all made of special heat-resistant alloy steel cast in one piece, molded in one time, and adopt the high and new technology of combining ring-type thick and thin and air film cooling. The primary air powder is separated by the ring-shaped thick and thin device, the thick-phase primary air enters the pulverized coal enhanced combustion chamber, and the light-phase primary air enters the light-phase air film wind channel. Dense-phase primary air in the pulverized coal combustion chamber is strengthened by the combustion of high-temperature oil flame quickly heated and warmed up, volatile components quickly precipitated and burned, oil combustion and volatile components of the combustion of a large amount of heat, continued to heat the primary air, will be heated to a much higher temperature than the ignition temperature of the coal species, will be ignited to form a high-temperature carbon particles torches sprayed into the furnace chamber. The light-phase primary air cools the pulverized coal combustion chamber and pulverized coal burner nozzle on the one hand, and on the other hand, it provides part of the oxygen needed for the subsequent combustion of the dense-phase pulverized coal and burns the ultra-fine pulverized coal in the light-phase primary air in the process of mixing, which increases the combustion exhaustion rate of the pulverized coal.
The double-strength pulverized coal burner is designed to be disassembled and assembled from the outside, and the double-strength oil burner, elbow and the whole pulverized coal burner can be disassembled and assembled from the outside, which is convenient for maintenance and replacement, and easy to operate.

 

4.2 Double-strength oil burner
It utilizes low-pressure forced air distribution to make fuel oil burn fully and quickly, generating a high-temperature torch to ignite coal dust directly.

It mainly contains fuel nozzle, combustion cylinder, air distribution cylinder, ignition device, flame detection device and so on. The fuel nozzle adopts simple mechanical atomization mode, mainly composed of oil dividing plate, spinning piece, atomizing piece and big nut, with simple structure. 1.0Mpa oil pressure fuel enters into the spinning piece after oil dividing plate, and then generates high speed and strong rotation, and the high speed and strong rotating oil flow passes through the spray hole of the atomizing piece to form the rotating hollow cone-type oil film, and the oil film will be further torn and crushed under the action of centrifugal force. Its wind distribution adopts graded forced wind distribution, according to the oil mist gradually burning the amount of wind required, graded gradual wind distribution, fuel oil and wind mixing uniformly and strongly, the flame combustion is intense, high stability, the flame center temperature is as high as 1800 ~ 2000 ℃, the burnout rate is as high as 99.9 ℃. At the same time, due to the use of graded low-pressure forced air distribution, combustion wind in the oil combustion cylinder before participating in the combustion of the inner wall of the formation of a complete air film to protect the layer, the combustion cylinder for adequate cooling, so the flame temperature is extremely high, while the oil burner cylinder wall is only room temperature, with a hand can be directly touched.


 
Oil burner work when the oil gun, ignition gun and flame detection devices are not in the high-temperature zone, so to avoid the coking of the oil gun and the ignition gun of the ablation problem, while the oil gun and the ignition gun do not need to be in and out of the actuator, to further simplify the configuration of the system, the use and maintenance are very simple.

4.3 Double-strength fuel and blowdown system
Including the main fuel pipeline, branch fuel pipeline equipment and blowing pipeline equipment, providing fuel control and fuel gun blowing control and other functions.
Dual-strength fuel oil using a master control, dual-strength fuel oil bus leading from the original boiler oil system bus after the shut-off valve, dual-strength fuel oil bus configuration manual shut-off valves, filters (one with a standby), pressure gauges, pressure stabilizer valves, manual valves, etc., but also according to the requirements of the configuration of the flow meter, and so on.
The double-strength fuel oil mother pipe is divided into double-strength fuel oil branch pipe, and the branch pipeline is equipped with manual shut-off valve, quick-closing valve, filter, pressure gauge, metal hose and so on.
Double-strength blowing system adopts non-master control, double-strength blowing branch pipe leads from the nearest large oil gun blowing pipeline manual valve, blowing branch pipe configuration manual shut-off valve, quick shut-off valve, check valve and so on.

4.4 Double-strength oil air distribution system
The air required for the combustion of the double-strength oil burner is provided, and the flame temperature and shape are regulated using this air distribution.
Double-strength oil air distribution is taken from a separate special fan, and each corner is equipped with one fan. Double-strength oil air distribution system is equipped with motorized adjustable dampers, wind speed measuring device, bellows compensator, etc.. The wind speed measuring device is composed of differential pressure sampling device and micro differential pressure transmitter.

 

4.5 Wall temperature online measurement
It is used for online detection of important data in the operation of double-strength less oil ignition system, which provides the basis for optimized combustion and optimized operation.
In order to ensure the safe operation of the double-strength oil less ignition pulverized coal burner, thermocouples are installed in the corresponding position of the burner to monitor the wall temperature. The location of the thermocouples is determined based on the industrial application of several double-strength oil less ignition pulverized coal burners and the temperature field of the burner in working condition. Thermocouple types are primarily K-indexed or armored thermocouples.
The installation of thermocouples in the design drawings of double-strength less oil ignition pulverized coal burner has clear requirements, and its basic principles are solid, wear-resistant, durable, easy to remove and replace.
Each double-strength less oil ignition pulverized coal burner is equipped with two sets of wall temperature thermocouples, used to monitor the burner wall temperature. When the wall surface of the burner is over-temperature, the wall temperature is reduced by primary air speed, oil distribution air volume, and double-strength oil burner output to ensure that the wall surface temperature is always less than 750℃.

 

4.6 Start grinding wind heating system
The function of this system is to increase the temperature of hot air of coal mill through the heating method of duct burner to meet the requirement of drying output of coal mill.
A set of duct burner is installed on the hot primary air duct at the outlet of the air preheater, and the output of the duct burner oil gun is 200-400Kg/h. The duct burner is utilized to heat up the primary air, so that the primary air temperature reaches the temperature required by the coal mill, and then the coal mill is started to make powder. The duct burner adopts high-pressure fan to supply wind, and the cold primary wind at the outlet of the primary fan is used as the blowing wind when the oil burner is out of operation.
The duct burner adopts double-strength oil burner with stable flame and high burnout rate. Duct burner fuel pipeline adopts double shut-off quick-break valve to ensure zero leakage of fuel when the duct burner stops running. Two thermocouples are installed at the suitable position on the primary air pipe downstream of the duct burner for detecting the primary air temperature after heating. Duct burner using flame detection and temperature detection dual means to ensure the safety and reliability of its operation.

 

4.7 Control system
The control system controls the double-strength pulverized coal burner, double-strength oil burner, double-strength fuel oil and blowing system, double-strength oil air distribution system, and carries out real-time monitoring of the monitoring system.
The control system is mainly composed of on-site equipment, PLC, frequency converter and indicator buttons, etc. The PLC adopts Siemens S7-300 series PLC, which realizes automatic control of the system and has DCS system interface, and combines with the on-site equipment to realize the functions of wind speed control of the oil air distribution system.
The design of double-strength less oil ignition thermal control system mainly includes the design of double-strength less oil ignition program, system protection logic and connection with DCS.

 

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