JP2013088111A - High-precision-burner burning control method using furnace body heat storage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the fluctuation of the internal temperature of a furnace and to significantly reduce fuel consumption simultaneously.SOLUTION: A furnace temperature sensor is mounted to detect heat storage in melting such that burner burning is stopped before the furnace temperature reaches a preset temperature and the internal temperature of the furnace is raised by utilizing the heat storage of the furnace body. If the furnace temperature naturally rises up to the preset temperature, the burner is reactivated to suppress an excessive rise of the furnace temperature by heating. Furthermore, intermittent burning control is conducted using an ON timer and an OFF timer.

Description

The present invention is a combustion system that uses heat storage of a melting furnace for burning a melting furnace burner.

Burners that heat the melting furnace include types that use various fuels such as kerosene, heavy oil, LPG, and natural gas, but it is difficult to accurately control the temperature of the melting furnace.

Burner combustion control device in copper melting furnace, inventor, Nikkiso Co., Ltd.,

Combustion device for heating furnace, inventor, Osaka tile company,

The temperature control of a melting furnace that melts iron and aluminum has many disturbances, and the burner consumes a large amount of fuel, so accurate temperature control is difficult at present. The present invention solves this problem and greatly reduces fuel consumption. This is an innovative technology.

The melting furnace is surrounded by a heat-resistant material such as refractory bricks around the furnace body. Actually, the heat-resistant material also has the ability to accumulate a considerable amount of heat. The present invention actively utilizes this heat storage and melting. It is intended to minimize the heat fluctuation of the furnace.

By using this combustion control method, we have used a large amount of fuel to raise the temperature of the furnace so that it has become overheated and the furnace temperature has become unstable. This method can greatly reduce fuel consumption and suppress furnace temperature fluctuations.

The schematic diagram of the equipment, the furnace temperature and furnace temperature at which the melting furnace is heated by the burner to melt the iron and aluminum inside, are sent to the combustion control panel by the sensor and the combustion burner is controlled. FIG. 3 is a control system diagram of a sequencer for combustion control, a burner blower, a damper for adjusting the air amount of the blower, a fuel electromagnetic valve for turning on and off the fuel, a furnace temperature sensor, and a furnace body temperature sensor connection state diagram. The figure showing the difference in the temperature rise and the temperature control curve between the combustion control method currently used and the high-accuracy combustion method using heat storage according to the present invention. The figure showing the difference in the temperature fluctuation in the furnace between the currently used combustion method and the high-accuracy combustion method using heat storage according to the present invention, and this method can maintain a more accurate and stable furnace temperature. The high-accuracy combustion method using heat storage of the present invention stably maintains the temperature in the furnace within a certain range and further minimizes the fuel consumption, and the burner combustion is not continuous but at intervals of about 10 to 60 seconds. The figure which showed the timing which is performing the innovative method which repeats ONOFF.

In the present invention, when a melting furnace is started up, an overhang that always occurs in the current system, that is, even if the burner is stopped, the furnace body temperature is measured by the phenomenon that the furnace temperature increases greatly due to the heat accumulation of the furnace body and the temperature inside the furnace rises. By doing so, it has a structure that preheats the heat by storing heat and stops the burner early to save fuel and prevent overhang

When starting up the melting furnace, first put the material in the furnace and switch on the burner ignition, the burner is activated, the combustion starts and the furnace body starts to be heated.

2.3 The set temperature is reached in about 3 hours and the burner automatically stops. However, with the conventional method, even if the burner stops burning, the temperature inside the furnace rises further due to the accumulated heat of the furnace body, resulting in excessive temperature rise.

In the present invention, as shown in FIG. 3, the heat storage temperature of the furnace body is measured using the temperature sensor of the furnace body, and the burner is automatically stopped before the furnace body temperature reaches the set temperature in the furnace.

As a result, the heat of the furnace body is used to wait for the furnace temperature to rise to the set temperature, and the burner is restarted when it reaches the set temperature. In addition, fuel consumption can be reduced to a minimum.

In this method, as shown in FIG. 5, after reaching the set temperature in the furnace, the burner is repeatedly turned on and off at intervals of about 10 to 60 seconds to suppress fluctuations in the furnace temperature and further reduce fuel consumption.

By adopting this method and the high-accuracy combustion method using heat storage, the temperature of the melting furnace is stabilized and it is possible to produce high-quality molten iron and molten aluminum.

This method and high-accuracy burner combustion control method using heat storage are used for burner combustion control of aluminum melting furnaces at Towa Metal Co., Ltd. in Nihonmatsu City, Fukushima Prefecture.

The feature of this system is that accurate furnace temperature control, melting furnace can be heated with much less fuel consumption than the conventional combustion system, and the furnace temperature can be accurately maintained with minimum fuel. Therefore, if it is used in iron and aluminum melting furnaces all over Japan, the effect seems to be extremely large.

Claims (2)

Combustion burner combustion control that uses two or more furnace temperature sensors and furnace temperature sensors or ambient temperature sensors in the melting furnace, and heats the melting furnace by reusing the residual heat of the furnace body and the heat stored in the furnace body method. After the furnace temperature reaches the set temperature, burner combustion control is performed by alternately turning on and off the combustion burner using the combustion ON timer and the combustion OFF timer.