This paper briefly introduces common technical specifications of lime slakers matching with dry method or semi-dry method desulfurizer,and systematically introduces the main performances of the matching devices and requests of the matching electrical devices and I&C system as well as supervising manufacture,performance test and technical service of project management.

This paper introduces the impacts of lime stone,coke oven gas,power consumption,process parameters control,labor costs,and other factors on the metallurgical lime production cost with Maerz kiln.In view of the actual production status,targets are put forward for the important factors such as fuels,raw materials,power consumption,process parameters control,etc.and control measures are made resulting in an dramatically-lowered operation cost so that the production cost of metallurgical lime can be lowered and management level of the same type of kiln can be upgraded in lime industry.

Large-scale double-shaft lime kiln is an inevitable development trend for lime industry. The research and development of the control system is an important part of the burning technology of large-scale lime kiln, and a stable reliable and standard control system is the requirement for large-scale lime kiln construction and application.

The lime process of rotary kiln is relatively complex，and the output and quantity of the products are influenced by material condition，material conveying speed，burning temperature，fuel supply，combustion air and main suction and other process parameters as well as working condition inside the kiln.Combined with lime process of the rotary kiln，this paper puts forwards technology of imitating biological neurons for model auto tuning by collecting online data with the basis of prediction technology of BP neuron network，and establishes high precision control model.The predictive control algorithm is an effective control algorithm with good applicability which can solve on\|site multi\|variable coupling effect and big time delay system.In practice，the burning process is controlled by burning unit and control system，the whole production system can run automatically according to the default parameters，and the limestone decomposes completely following the default temperature curve to produce high quality lime.

Bearings seat were located inside the chamber and on both sides of  Φ1 220 reversing valve of Maerz lime kiln.Bearing seals could be easily burned out by hot gas and high concentration dust during the producing process,which could cause bearing failure and take too much time to replace the bearing and lead a great impact on production.After analyzing the reversing valve and improving its construction,bearing blocks are setted outside of chamber,which effectively avoids the accident of bearing failure etc.and ensures stable production.

The temperature of the tail gas in air heater of rotary kiln is above 250℃,and the exhaust temperature of the tail gas into the atmosphere is about 170℃,the waste heat should be utilized to avoid wasting energy.Based on the principle of saving energy and waste gas recycling, the factory can make full use of the gas energy to heat the water to the heating temperature by using low-temperature waste heat power recycling technology and setting one gas heat exchanger.

Aiming at the deformation problems of tundish dry material moulding bed during use, this paper analyzed the reasons of deformation and explained how to reduce the deformation and increase service life from two aspects, including of improvement on the inner temperature field and the integrity of the moulding bed.

This paper introduced the pressure stabilizing device used for heat treatment carburizing furnace and working device used for vertical hoisting and quenching.The combination of both the above devices improved the performances of die sleeve lower hardness and diameter size distortion out of tolerance caused by unstable and volatile pressure for carburizing furnace.As a result, the furnace pressure were stable,the quality of products after heat treatment and production efficiency were improved,and the production cost were reduced.