Lime Vertical Kiln

1.Raw material workshop

2.Raw material ingredients

一、Kiln design and technical description of the process

Our new energy-saving and environmentally friendly lime shaft kiln adopts advanced shaft kiln design technology, and on the basis of absorbing and introducing the advanced design of foreign shaft kiln, we have carried out bold technological innovation, equipment improvement, and process improvement. After the innovation and improvement of our unit after the lime kiln shaft kiln, in energy saving, environmental protection, finished ash activity, automation and other aspects have been significantly improved.

3. Lifting into the kiln

4. Kiln discharge and warehousing

1. principle

The main component of limestone is calcium carbonate CaCO3, while the main component of lime is calcium oxide CaO2. the principle of lime production is that at a high temperature of about 1150 ℃, the calcium carbonate in limestone decomposes into calcium oxide and carbon dioxide.

Lime production process is: limestone and fuel in accordance with a certain proportion of mixed into the lime kiln, when the limestone in the pre-tropical belt after preheating to 900 ℃ began to decompose, and then calcined belt calcination is the temperature reached 1150 ℃ to generate calcium oxide. After cooling belt cooling and unloaded from the kiln.

5. Ball mill

6. Finished product warehouse

2. Automated control systems

The "environmentally friendly and energy-saving high-efficiency lime kiln" researched and developed by our institute. From electronic batching, lifting, automatic feeding, temperature control, air pressure, roasting, ash unloading, loading and transportation, all of them adopt microcomputer network control system, combined with human-machine interface control system and common computer control system. Achieved the man-machine interface and site synchronous operation, than the old lime kiln to save more than 50% of the labor force, improve production efficiency by 40%. Reduced labor intensity and improved working environment. After nearly several years of production and use shows that the kiln automation control system is reliable, low failure rate, greatly improving production efficiency and saving a lot of cost.

7. Finished product loading

8. Monitoring room

石灰竖窑技术参数 Technical parameters of lime vertical kiln
参数  规格 parameters	日产200T Daily 200Ton	日产300T Daily 300Ton	日产400T Daily 400Ton
年产 annual	60000T	90000T	120000T
年工作日 annual working days	300 day	300 day	300day
窑炉内直径 Kiln inner diameter	5600mm	6000mm	6600mm
窑炉外直径 Kiln outer diameter	7600mm	8000mm	8600mm
筒体高度 Kiln  height	33m	35m	38m

二、Process Composition

Lime calcination process：

(1) Metering, conveying and uniform batching of raw limestone ore and fuel;

(2) Lifting and fabrication of raw materials;

(3) Preheating, calcination and cooling of raw materials in kiln;

(4) Unloading, conveying, warehousing and transportation of finished lime.

三、Process Flow

Raw limestone and anthracite are transported to the batching bin by belt conveyor and unloading truck, limestone and anthracite are measured and loaded into the hopper for mixing by belt weighing, and then elevated to the kiln top transition bin by elevator, and then the kiln top fabricator will evenly distribute the mixed raw limestone and anthracite to the kiln for calcining, and then the calcined finished lime is unloaded through the lime unloading machine and the two-section sealing ash discharging machine, and then it is transported to the hopper elevator by belt conveyor and then elevated to the finished product bin, and finally loaded to the truck for external transportation. Then it is transferred to the hopper elevator by belt conveyor, and then elevated to the finished product silo, and finally loaded into trucks for external transportation.

In the process of calcination in the kiln, the blower blows air into the kiln to help combustion, and the high-temperature flue gas generated by calcination first rises through the raw materials just entering the upper part of the kiln, preheating the raw materials, and then under the action of induced draft fan, and then finally through the desulfurization and dedusting system for desulfurization and dust removal, and then discharged into the atmosphere after reaching the standard.

1. New energy-saving and environmentally friendly lime vertical kiln process human-machine operation interface：

The system consists of a two-level microcomputer and fieldbus control system. The upper computer is Advantech industrial control machine, the lower computer control core part adopts Siemens PLC (programmable controller) S7-300 system, which contains digital input/output module, analog input/output module, interface module, integrated weighing module, the system operation interface adopts German WINCC human-computer interface software, and the probe scale adopts the intelligent heavy weight type material level meter. The feeding, fabric, ash discharge and air supply systems are controlled by frequency converters, realizing the fully automated production of environmentally friendly and energy-saving lime kiln.