Consumption reduction measures for kaolin rotary kiln
1. Sealing modification of the bottom of kaolin rotary kiln
Before the transformation, the air leakage at the bottom of the kaolin rotary kiln was serious. It mainly relied on the ash outlet to seal the furnace bottom. However, there was a 2-5mm gap between the rotor and the shell of the ash outlet. A large amount of air leaked from the device, which brought a lot of trouble to production. Negative Effects. For example: it causes a large amount of waste of fan air volume, causes the lime furnace air and gas pressure ratio to be too high and uncertain, and flue gas emissions increase heat loss, which has an adverse impact on production safety. The airflow leaking from the bottom of the furnace not only brings out a large amount of heat, but also causes the temperature in the furnace to be transferred to the bottom of the lime furnace, causing the temperature of the cooling section and the bottom of the furnace to rise. Most of the lime when it comes out of the furnace contains baking materials. When the temperature is the highest, it can Reaching above 500 degrees Celsius, a large amount of heat energy is lost, and it is not conducive to the safe operation of furnace bottom equipment and the cleaning of waste rocks in finished lime.
For the above reasons, the air leakage problem at the bottom of the furnace needs to be modified. A sealing device is designed and installed in front of the ash discharge machine. The sealing device uses electric motor hydraulic push rod power to open and close the discharge port. It seals the bottom of the furnace without discharging material and prevents wind and gas leakage to solve the problem of air leakage. question. This sealing device is made of thicker steel castings, which is not easy to deform, has good sealing effect and long service life.
2. Utilization of flue gas waste heat from kaolin rotary kiln
During the normal production process, the temperature of the flue gas discharged from the kaolin rotary kiln is 300-600 degrees Celsius. It is directly discharged into the atmosphere and the heat is directly lost. This part of the heat energy has considerable utilization value. Therefore, the utilization of the waste heat of the flue gas must be considered. .
First, the combustion air is connected to the top of the furnace through the pipe and enters the upper part of the heat exchanger. After being heated by the heat exchanger, it is connected from the bottom of the heat exchanger to the burner part in the middle of the kiln for use when burning gas. The air temperature rises by 150-300 degrees Celsius based on the original room temperature. After the air temperature rises, the effect of utilizing the waste heat of the kaolin rotary kiln is very obvious, saving 10%-15% of gas, and the economic benefits are considerable.
Because the flue gas dust in the kiln is too large, it is easy to block the internal pipes of the heat exchanger. We use an air compressor scheduled soot blowing system to blow the device regularly, thus fundamentally solving the problem of dust being discharged into the atmosphere. , which not only saves energy but also protects the environment.
3. Fan frequency conversion control technology
According to this, the fan variable frequency speed regulator uses a sine wave PWM pulse width modulation circuit. After adopting the variable frequency speed regulation, the frequency is adjusted in time according to the air volume to adjust the fan speed. By adjusting the frequency of the fan, the air volume is changed, which plays a role in saving electric energy. .