Double-chamber kiln is also called double-chamber parallel flow heat storage lime kiln. The Xinhua double-chamber kiln has the unique functions of ultra-low energy consumption and homogeneous calcined lime. In order to achieve the above functions, the kiln has a special shape and a unique production process.
1. Description of Xinhua Double Chamber Kiln
The Xinhua double-chamber kiln actually has two kiln chambers containing limestone, and each kiln chamber is connected by a connecting channel at the junction of the cooling section and the calcination section;
The double-chamber kiln operates alternately between two cycles, and also shows preheating, combustion and cooling sections;
In cycle 1, the combustion air enters the top of the No. 1 kiln, combines with the fuel in the combustion zone, flows downwards into the channel, and is discharged through the top of the No. 2 kiln;
The cooling air enters the bottom of each kiln, combines with the gas flow in the channel, and is discharged through the No. 2 kiln. In cycle 2, the combustion air and fuel enter the No. 2 kiln and flow down into the channel. Discharged from the chamber of No. 1 kiln.
2. Process principle
Combustion in a double-chamber kiln always occurs when the combustion air and fuel flow downwards. In each kiln, limestone also moves downwards. This process is called "parallel flow", which is the first of the two characteristics of the kiln. The co-current extremely hot flame is in contact with limestone and colder gas to complete the calcination process. The raw limestone at the initial end of the combustion zone cannot be over-burned, and the heat exchange rate may be high. Near the end of the cooler combustion zone, the limestone calcination is completed and uniform light calcination conditions are obtained.
The second feature of the Xinhua double-chamber kiln is the "regeneration" heat storage process, which takes place in the preheating zone. In this area, the limestone becomes a huge heat exchanger, absorbing the heat in the exhaust gas and reducing the gas temperature to a very low temperature. In the next cycle, some heat is released into the inhaled combustion air, causing the combustion air to reach the combustion temperature before it contacts the fuel. This process is very efficient, and the heat of the exhaust gas is fully utilized. This is to a large extent the reason for the extremely high thermal efficiency of the Xinhua double-chamber kiln.