lime rotary kiln for tne active lime production line

Lime can be divided into ordinary lime and active lime two type, the former mostly ordinary shaft kiln firing kiln and its degree of activity is generally less than 200ml, mainly for road construction and use; the latter is mainly composed of mechanical shaft kiln and rotary kiln firing, the activity of up to 300 ~ 420ml. Lime kiln fired with the best quality, they are mainly used in steel smelting, chemical and power plant desulfurization and other industries.

In all active lime production process, or the most advanced rotary kiln production process, the main features of this process is assembled shaft kiln preheater effective heat consumption is low, the respective advantages of the rotary kiln temperature field uniformity of high activity, used limestone rotary kiln with preheater and vertical cooler, to achieve energy saving, environmental protection, the activity of good production requirements.

Process

1. production material

1) Limestone

Limestone particle size requirement is 10 ~ 40mm, 40mm and exceeds the upper limit of 10mm section shall not exceed 5%, maximum size ≤50mm.

2) Fuel

Furnace fuel may be gas, natural gas, coal bed methane and coal. Pulverized coal required after grinding to a pulverized coal supplied by the station.

2. Production line using the energy-saving measures

Use energy-saving burner combustion equipment, automatic control with optimal air flow and reduce the loss of incomplete combustion of fuel.

Lightweight insulation refractory brick kiln using the outer and inner wear fire-resistant composite brick kiln outer skin to reduce heat dissipation.

In the rotary kiln has a rear vertical preheater, rotary kiln full advantage of the high temperature combustion gas, the material inside the preheater preheater, so that the material partially decomposed in the preheater, the system production increased 40 % thermal efficiency increased by 30%.

In the rotary kiln head has a vertical cooler and take advantage of high-temperature kiln calcined white discharge calories secondary air is preheated to 600 ℃, the thermal efficiency is improved. Kiln Mining

Kiln hood and cooler with vertical integration of design and construction, small footprint, good sealing, effectively prevent the hot exhaust fugitive emissions.

Kiln dust collection environmental good, and the use of cyclone dust collector pulse bag filter two dust emission concentration is lower than the national standard.

High level of automation, regulate the operation of the production system, using PLC control and alarm in the main control room centralized control, fewer site operations personnel, high labor efficiency.

3. Production Process

(1) raw material storage and transportation

Limestone particle size 10 ~ 50mm transported to the plant in a pile in yard, yard work using the loader. Granular material passing by the loader to load stone quarry set up by the trough by trough under the feeder dosing the stone to Tai steep conveyor, and then sent to the screening floor, limestone through sieve after minutes after passing through the particle size weighed by the steep conveyor to the top of the preheater silo. Sieve powder from the conveyor to the # 3 yard regularly shipped out by the forklift.

(2) limestone calcination

limestone calcination is composed of kiln preheater +rotary kiln + vertical cooler, yield 100 ~ 800t / d, the material from the preheater at the top of the silo by cutting import preheater tube slide body, while the rotary kiln incoming high temperature flue gas to preheat the material above 1000 ℃, so that partial decomposition of limestone, then followed by the hydraulic push rod is pushed into the tail of the rotary kiln, the rotary kiln calcination and then discharged into the cooler, blown by the fan the cold cooling, the batch is cooled to ambient temperature below 60 ℃ + cooler discharge. Cooler air is blown through the air into the rotary kiln as secondary combustion participation.

(3) product delivery

By the chain conveyor, bucket elevator after the finished lime discharged from the cooler, belt conveyors transport the finished lime to each library. Lime silo discharge valve for bin lime loaded cars, tanker after Sinotrans. Setting silo reserves of different sizes according to customer requirements.

Finished with a circular silo silos, 5 ~ 50mm finished products warehouse 2, <5mm a finished products warehouse, each silo is about 800t;

(4) flue gas treatment

Kiln combustion flue gas temperature after the preheater and limestone for heat exchange, the temperature dropped to below 250 ℃, and then carried into a cyclone dust collector collecting the dust collecting large particles, then after entering the baghouse dust into the atmosphere at high temperature fan, exhaust gas dust concentration is less than 50mg / m3. Setting the cold control system ESP inlet for dust protection.