Double chamber lime kiln

Description

Brief introduction of double chamber lime kiln

Dual-chamber lime kiln, also known as Meltz lime kiln, is a new type of energy-saving lime kiln introduced from Meltz Company in Switzerland. Dual-chamber lime kiln is the first large-scale industrial lime kiln put into use since the scale of lime.

Double-chamber kiln has been widely praised in the lime Market for its high output, low energy consumption and diversity of raw materials and fuels. So far, the double chamber lime kiln has been developed for more than 60 years. The Swiss company Meltz Lime Kiln has built more than 4000 lime production lines in full time. More than 140 double-chamber lime kilns have been built by Meltz Company in Switzerland, China, most of which are 600 tons of double-chamber lime kilns per day. There are also about 30 double chamber lime kilns with a daily output of 400 tons.

The double-chamber lime kiln consists of two lime calcining furnaces. The two calcining furnaces are interconnected and alternately calcined. The parallel flow regenerative double-chamber shaft kiln has two kiln bodies. The upper part of the kiln body has a reversing system, which is used to alternately use two kiln bodies. The lower part of the kiln body calcining zone is provided with interconnected channels. The pulverized coal spray gun is installed in the pretropical zone and buried in limestone.

Advantages of double chamber lime kiln

During production operation, the function of the kiln body is changed every 12 minutes, that is to say, every kiln body is heated once every 12 minutes. The single bucket hoist is used to feed the shaft kiln, and each time the kiln body is changed, the single bucket hoist adds one bucket of limestone to the two kilns through the reversible belt on the top of the kiln. In front of the single bucket hoist, there is a weighing hopper with an electronic scale to accurately weigh each bucket of limestone. The roots blower is used to feed pulverized coal alternately from the upper part of the two kilns, and the pulverized coal is evenly distributed across the section of the kiln through a spray gun. Roots blower is used to feed combustion air from the top of the shaft kiln into the kiln. The air is mixed with pulverized coal in the calcining zone through the pre-tropical zone. The pulverized coal is burned in the calcining zone. The material can be calcined in parallel with the flame and material. The waste gas generated by calcining limestone in the calcining zone enters another kiln body through the connecting passage of two kilns, and flows upward opposite to the loading limestone material flow, preheating the limestone in the other kiln body.

The calcined lime is discharged from the discharging device at the lower part of the kiln body and enters the discharging hopper at the lower part. Because of the high pressure in the shaft kiln, these hoppers are sealed by hydraulic operated gate. In each commutation cycle, the sealing gate is opened regularly, and lime falls into the lower hopper. Then it is fed to the heat-resistant belt conveyor through the vibrating feeder, and then transported to the finished lime screen for screening and storage.

Structural characteristics of double chamber lime kiln

Most of the equipments on the shaft kiln are operated by hydraulic pressure. These equipments include rotary feeder, kiln top closing gate, rotary bell, exhaust gas reversing gate, weighing hopper gate, discharging device, discharge hopper sealing gate, hydraulic valve of pulverized coal pipeline and air pipeline, limestone level indicator, etc. The mechanical level indicator is used to measure the level of limestone in the parallel flow regenerative double chamber vertical kiln.

Air supply principle of double chamber lime kiln

There are 12 Roots blowers in the shaft kiln, of which 3 are used to provide combustion-supporting air, 3 are used to deliver cooling air to the kiln, 1 is used to provide combustion air or cooling air, 3 are used to cool the spraying gun, and 2 are used to deliver pulverized coal from the weighing hopper to the spraying gun. Of the 12 Roots blowers mentioned above, three are AC motor drives with variable frequency speed regulation. The parallel-flow regenerative double-chamber shaft kiln is equipped with PLC control devices for automatic operation. The computer in the central control room displays the flow of the equipment, the position of various gates and valves, and sends out alarm signals and displays alarm information to the errors in operation. The computer can display various technical data and setting range of technical parameters, such as fuel and air supplied to the kiln, temperature between kiln passages, pulverized coal temperature, temperature of exhaust gas and lime discharged from kiln, system pressure in chamber, combustion and cooling air pressure.

Electrical Automation of Double-chamber Lime Kiln

The PLC system control program of double chamber lime kiln can automatically open and change the sequence and operation of each stage of limestone heating and charging, and ensure the uniform discharge of calcined lime.

Because of the advanced feeding system of the cocurrent regenerative double-chamber shaft kiln, the material segregation can be avoided and the ideal distribution of limestone can be achieved on the cross section of the double-chamber kiln. The special fuel distribution system of the kiln can ensure the uniform heat supply on the section of the kiln.

Dual-chamber lime kiln is widely used in the world lime industry because of its superior performance, but its market share in China is not high. Because of the technical patent requirements of Meltz Company, domestic companies can not make good use of its technology, and many companies can not afford the construction cost because of the import of all equipment and high tariffs. With the opening of the market, Meltz Company of Switzerland actively seeks the cooperation of domestic powerful enterprises. As we Tongjia Industrial Equipment Technology Co., Ltd. and Meltz Company have reached the strategic partnership of domestic construction of double-chamber lime kiln, our company can realize the domestic production of double-chamber lime kiln in terms of equipment manufacturing, electrical control system and high and low voltage distribution, and in terms of double-chamber lime kiln. The construction cost of lime kiln has been greatly reduced. It is believed that the market share of double-chamber lime kiln will be higher and higher in China by virtue of foreign advanced technology and good energy-saving technology.

Parameters

Features

1. Double-chamber lime kiln, two kiln chambers alternately calcine with high output.

2. The function of double-chamber calcination to lengthen the preheating zone and cooling zone.

3. Calcined lime has high activity, energy saving and environmental protection, and reduces combustion energy consumption.

Application

600 tons/day double-chamber lime kiln production line

1200 tons/day double-chamber lime kiln production line