Application of Baide Burner in Aluminum and Aluminum Alloy Holding Furnace Liu Min Luoyang Nonferrous Metals Processing Design and Research Institute 471039 Suzhou Xinchangguang Industrial Furnace Co., Ltd. 215008 is used in the boiler industry. In recent years, it has been promoted in the aluminum processing industry. . This paper combines its use in aluminum and aluminum alloy holding furnaces for analysis and discussion, so as to be better and more widely used in the production of aluminum processing industry.
1 Introduction In recent years, with the increase of electricity prices, many aluminum processing plants have changed the furnace type with electricity as heat source to light oil natural gas or liquefied petroleum gas as heat source, such as heat preservation furnace soaking furnace and time effect furnace. These furnaces all have the characteristics of low heating capacity, high temperature control accuracy and high automation requirements. At present, the domestic burners can not meet these requirements, and the Italian-made Baide 8 people, electromechanical body burners, set the ignition fire detection system in the body, with high degree of automation, easy to control the installation and operation, etc., more suitable for this Class use. According to the type of fuel, the Bead burner can be divided into a fuel type; natural gas and liquefied petroleum gas type; dual fuel type light oil mixed with natural gas and liquefied petroleum gas. According to the working mode, it can be divided into seed type; segment type; segment progressive according to the actual working conditions and specific requirements of the company's working characteristics, the author designed a 15 ton holding furnace for the Grandis Shanghai Aluminum Co., Ltd. In the middle, the Baide segment type light oil burner is used. After on-site commissioning, the burner can fully meet the production process requirements of the holding furnace.
Structure configuration of 2 Baide segment light oil burners
The anode solenoid valve is known as 1. The burner has its own oil pump and fan. There are two nozzle nozzles in the body, which are the first stage flame of the small fire nozzle and the first stage flame of the large fire nozzle. The working principle is as follows: closing the start and stop switch and the control box switch The motor and the ignition transformer are started. The motor drives the fan to pre-sweep the furnace. At the same time, the oil pump is driven to remove the air bubbles in the oil pipe through the oil return pipe. When the electromagnetic valve is opened, the pre-purging is completed, and the fuel enters the pressure at a pressure of 1213. The fire sprinkler enters the furnace after being atomized, and the electric spark at both ends of the ignition electrode is ignited, and the position of the damper can be appropriately adjusted; after the small fire is normally burned, the solenoid valve of the class fire is opened, and the fuel is also under the pressure of 121. When entering a large fire nozzle, the damper is simultaneously opened by the hydraulic regulator so that the combustion can be performed normally.
The burner has an advanced combustion controller and monitoring system, and provides automatic control of the purge, ignition, fire detection and the like. When any of the burners fails to reach normal, the combustion process is automatically interrupted, and the burner is automatically locked in a fault state. The fault red light is on and an alarm signal is issued. After the fault is removed, the burner can be started again and operated under the command of the control system.
3 Application 3.1 The automatic control of temperature and the aluminum alloy holding furnace is the static and thermal insulation of the aluminum processing plant. The accuracy of the temperature control level directly affects the quality of the cast product. The process characteristics of the furnace are low heating capacity, low furnace pressure, and high control accuracy of the furnace temperature. In the past design, resistance band heating, thyristor control, temperature control accuracy of ±3. In the recent 15 ton insulation furnace designed for Grangis Aluminum Co., Ltd., two hundred were selected. The section type light oil burner, model number 稂34030, the accuracy of a single burner can reach ±3. According to the principle of heat balance, in order to maintain the normal heat loss of the furnace body, the small fire is set in a straight-off state, and the fire is on and off. Bit. When the small fire is not enough to keep the furnace temperature at the set value, the fire is output under the command of the control system; when the furnace temperature reaches the set value, the fire is extinguished, leaving only a small fire to supply heat. The time when the fire is turned on and off is controlled by the self-tuning in the smart meter, so that the automatic control of the furnace temperature is realized by the on-off control of the fire. In the 14 production process of the holding furnace, the worker only needs to set the furnace temperature between the instruments, so that the automatic control of the furnace temperature can be realized, the operation is very simple, the working conditions are improved, and the true furnace temperature is realized. Automatic control.
The above cut is unmatched by domestic burners.
First of all, the domestic burners are less self-contained with oil pumps and fans. Sometimes several burners use a combination of oil pumps and fans. The burners interfere with each other during combustion, resulting in a flame state that is not constant. After each ignition, the length of the flame and the heat load will be Changes occur, the constant heat load output will cause the temperature control accuracy is not high, and artificially adjust the burning condition of the burner again, it is impossible to achieve true automatic temperature control; secondly, the domestic components are guaranteed, let alone No automatic temperature control.
In summary, it is precisely because of the use of a highly automated Black & Decker burner that automatic control of the furnace temperature can be achieved.
3.2 Oven In the past, the flame furnace was in the oven process. In the medium and low temperature period, wood is mostly used as a heat source. The biggest disadvantage is that it can't control the furnace temperature, its value fluctuates greatly, and from the beginning of the oven, the furnace temperature reaches 300 ft 40 and still 0, which cannot be carried out according to the oven curve. This time, the oven was applied to the 15 ton holding furnace, and the Baide burner was directly used. The oven was ideal.
First of all. The temperature control of the whole oven process is good, especially in the low temperature section, which meets the temperature rise requirement of the plant 5101.
Due to the large adjustment ratio of the Bead burner, by changing the nozzle head at the front end of the burner, it is possible to change the small burner at 2.5 gallons of the burner to a small gallon at a time of 1.5 gallons to ensure the heating rate. The furnace temperature control precision is high, the temperature difference is small in several insulation sections, and the measured furnace temperature value and the oven curve are basically. 2 is the strip heating curve drawn according to the measured furnace temperature value.
Secondly, the workers only need to operate in the instrument to complete the oven. Compared with the past, the manual addition of firewood for the oven has greatly reduced the labor intensity of the workers.
In addition, the West's burner is atomized by raising the oil pressure to 12 by its own oil pump. The atomized oil particles are very small in diameter and easily mixed with air to make the combustion more complete. With this burner oven, there is no phenomenon that the furnace door is black when the wood oven is used.
4 Asking and handling methods encountered during the commissioning process In the production process of the holding furnace, it is necessary to stop the burner for a period of time. When the fire is stopped, the solenoid valve in the burning body is cut off, and the motor is powered off, that is, the fan and the oil pump are stopped. At this time, the furnace temperature is as high as 800,900, and the furnace pressure is slightly positive pressure, and the high temperature furnace gas will be reversed. The fire detector and the high-voltage ignition line quickly burned it. At present, the burner itself does not have the self-protection function after the ceasefire.
During the commissioning, we took several protective measures to change the control circuit of the burner body. After the fire ceases, the motor is not stopped, and the cold air blown out by the fan cools the burner's fire detection device and the ignition wire, because the oil pump and the fan are coaxially connected. , motor.
It also drives the oil pump to operate. The oil only plays the role of lubrication and cooling at this time. If the oil is too dirty or dirty, the oil pump will not absorb the oil, so that the oil pump will dry and dry, and the light will cause the connection between the motor and the oil pump. The shaft is detached, and the oil pump is damaged. Therefore, during the commissioning, the return pipe is directly returned to the high tank to ensure smooth and unobstructed exhaust of the oil circuit; a filter is added to the oil supply road to ensure the cleanness of the oil circuit. .
After practice, the effect is good.
In addition, there is a design scheme, that is, the burner is stopped, so that it automatically exits the furnace, and the block heat-resistant insert plate is separated between the furnace and the burner, so as to avoid the hot gas from the overflowing burner and the fire detection device and the point. Fire line. Due to the limitations of the site conditions, it can only be considered in the future juice setting.
5 Conclusions should pass through the Bead burner in a 15 ton holding furnace. We have achieved some successful experiences. The unique advantage of the burner in the automatic control of the furnace temperature is that the domestic burner cannot be compared with it. Although there are still some questions, it is inevitable to use it as a new type of burner in a holding furnace. In the future design, we should also study the performance of the burner itself and add some protective measures to make it better used in the production of aluminum processing industry.
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