Energy - saving Design of Chaeng Activated Lime Rotary Kiln Production Line

Active lime rotary kiln production line as a unit of energy consumption of major energy-consuming industries, the rational use of resources and reduce the consumption of the focus. This active lime rotary kiln production line design should be based on mature and reliable, advanced and reasonable principles, and actively adopt energy-saving production technology and high efficiency and low consumption of equipment, in order to obtain the best energy saving effect.

First, the process energy-saving measures

1) In the rotary kiln at the end of preheater, can make full use of high-temperature rotary kiln exhaust gas, preheat the preheater material, the material in the preheater part of the decomposition, the decomposition rate of up to 30% -35% , The system output can be increased by 40%, thermal efficiency increased by 30%.

2) in the rotary kiln head, configure a cooler, make full use of high-temperature materials (lime) heat, improve the temperature of the secondary air can be heated to 600-700 ℃. And then the use of high-temperature secondary air combustion to the role of fuel consumption can be reduced.

3) in the heat of the larger rotary kiln body, kiln refractory kiln with a new type of refractory brick technology, the cylinder temperature decreases, improve thermal efficiency.

4) Multi-chamber preheater adopts sub-chamber structure, which can effectively solve the problem of uneven heat exchange between hot flue gas and limestone, and reduce the resistance of hot gas through the column. The resistance reduction rate is about 30%.

5) Under the premise of application, the design of the use of the original height difference as far as possible transport limestone, saving energy; the use of low power consumption belt conveyor, plate chain hoist and other transportation equipment to replace the higher power consumption of the vertical lifting conveyor equipment Conveying bulk material. These devices have a large amount of transport, distance away, safe and reliable operation of the failure rate is low, and no dust advantages, compared to traditional transmission equipment, saving more than 40%.

Second, energy measurement measures

1) The combustion air measurement: the use of microcomputer control panel hole flowmeter control system, so that coal with the air flow rate is accurate, stable ratio to reduce the excess air coefficient and improve the thermal utilization of coal, thereby reducing the production of lime production heat Consumption provides the basic conditions for the active lime roasting conditions stable, active lime production, quality, heat consumption decreased.

2) Limestone metering: the kiln limestone metering and feeding system is an important link in the management and control of the roasting system. The stability of the limestone flow can ensure the stability of coal combustion.

3) fuel metering: into the mill raw coal metering feed system, gas flow measurement system is the management and control of fuel consumption has an important part.

4) Pulverized coal measurement: In the project of pulverized coal preparation, pulverized coal is fed, the metering system adopts the pulverized coal dosing system and the closed-loop control system with weighing sensor to ensure the metering and feeding balance Stable, that is to improve the environmental health conditions, but also conducive to the stable operation of the combustion system.

Third, the concept of circular economy and comprehensive utilization of resources in the project:

1) roasting equipment dust collection system before the collection of dust, and the collection of anti-powder system to collect unqualified limestone can be used as raw material for cement plant.

2) kiln dust collector to collect the dust transported to the finished product delivery system to the finished powder storage bin for sintering.

3) Kiln cooling and finished dust removal system dust collector dust collection system is transported to the finished product delivery system to the finished powder silo for sintering.

Fourth, the use of waste heat

In the active lime rotary kiln production line with pulverized coal preparation, the kiln exhaust gas is used as the hot air source for the drying raw coal to reduce the total amount of the flue gas, and the heat of the flue gas of the kiln tail is rationally used.

Chaeng(Great Wall Machinery Co., Ltd.) engineering and technical personnel in accordance with these three aspects of energy-saving measures, successfully developed with vertical preheater and vertical cooler energy saving and environmental protection rotary kiln calcination process, compared with the traditional process, the output increased by 30% , Heat consumption reduced by 40%, the exhaust gas temperature below 220 ℃, easy to collect, fully meet the energy saving environmental protection requirements.