This article introduces current application situation and existing problems of the TC-12102 type 3rd generation reciprocating grate cooler in a 5 000t/d clinker production line. A technical reform scheme is adopted to replace the grate cooler by the 4th generation grate cooler with middle roller crusher. Good results have been obtained through accurate equipment selection, reasonable process design, strict site construction. Assessment indicators reach to expected after transforming, included the reliability and stability of the equipment, clinker temperature, secondary and tertiary air temperature, integrated power consumption of cooler. The clinker temperature out of grate cooler drops to 85.4℃, and the integrated power consumption drops to 5.9kW·h/t.cl. This technical transformation brings about 14 million yuan of direct economic benefits to the enterprise each year.

The structure, installation position, working principle and operation method of the heat shield are described. After using the heat shield, the temperature of the secondary air and the tertiary air is greatly improved, the heat recovery efficiency has been significantly improved, the temperature of waste heat is reduced, and the natural gas can be saved by 3 875 598m3 each year. The negative pressure of the kiln hood is basically stable at the fluctuation range of -55~-45Pa.

The calculation methods of parameters such as design conveying capacity, theoretical cross-sectional area, inclination reduction coefficient, horizontal turning coefficient and other parameters in the preliminary design stage of long-distance belt conveyor were introduced. Combined with the site survey results of a specific project, the main design parameters such as the design conveying capacity, belt speed, and bandwidth of a certain project were calculated, and the selection of conveying equipment was preliminarily determined, which lays a foundation for the detailed design stage.

The γ-ray on-line analyzer is introduced in the raw material batching for cement clinker production line, on the basis of the manual batching with fluorescence analyzer. Changes before and after the use of the γ-ray on-line analyzer are compared and analyzed from the aspects of chemical composition stability of raw material, detection rate value, clinker stability, process change of firing system and clinker quality. After using the γ-ray on-line analyzer, the stability of raw material in cement production line and detecting efficiency is greatly enhanced. At the same time, the calcining condition in kiln is stabilized and clinker quality is significantly improved.

Based on the analysis of the Global Mercury Assessment released by UNEP, the present situation of mercury emission in cement industry at home and abroad was summarized. The mercury emission factor of cement in major production countries was compared and the important influence of coal combustion on mercury emission from cement industry was studied. The total mercury emission of global cement industry is 277t and the total mercury emission of cement industry in China is 134.05t in 2015. Combined with the characteristics of cement industry, mercury emission control measures and efficiency are analyzed and the best way to reduce mercury emission in China's cement industry is proposed.

The formation mechanism of nitrogen oxides was analyzed, and the design idea of denitration calciner was formed. The design idea of denitration calciner is to increase the height of the tertiary air duct, reduce the position of coal feeding point in the calciner, form an anoxic area in the middle, and create a denitration reduction area in the lower part of the calciner, and finally reduce all the nitrogen oxides generated in the rotary kiln. The actual transformation project shows that the emission concentration of nitrogen oxides combined with SNCR system can be controlled within 50mg/Nm³, and the consumption of ammonia water is greatly reduced.

In order to solve the problems of high energy consumption, low efficiency and high failure rate of limestone belt conveyor in raw material conveying system of raw material grinding section, the three-phase asynchronous drive motor of belt conveyor is transformed into permanent magnet motor drive system. After the transformation, the operation energy consumption of the drive system is reduced from 0.153kW·h/t to 0.107kW·h/t, and the annual electricity cost is saved by about 135 000CNY. The system with low noise, convenient maintenance, can be started with load, and will not affect other electrical equipment generate interference.

The influence of ultrafine fly ash on sulfate attack resistance of cement concrete was studied, aiming to solve the problem of sulfate attack of buildings at low temperature in Xinjiang. The mass loss rate and compressive strength performance of different cement concrete specimens were tested under the conditions of 30%, 45% and 60% ultrafine fly ash in the temperature of 5℃ and the sulfate erosion solution of 5%. The experimental results showed that the mass and compressive strength loss of the blank specimens without fly ash were relatively very large under sulfate erosion, indicating that the sulfate attack resistance of the specimens without the addition of ultrafine fly ash was poor. There was no mass loss of cement mortar specimens mixed with ultrafine fly ash, and there was the positive correlation between compressive strength and erosion age. The addition of ultrafine fly ash could effectively improve the sulfate resistance of cement mortar, and with the increase of the content of ultrafine fly ash, the growth rate of compressive strength of cement mortar in sulfate attack solution also increased.

The influence of ammonium ion in fly ash on cement performance was studied by adding ammonium sulfate into fly ash to simulate fly ash with different ammonium ion content. The test shows that the influence of fly ash ammonium ions on the standard consistency of different varieties of cement should be confirmed through the actual production; the condensation time of cement can be extended after the fly ash ammonium ion content reaches a certain value; when the fly ash ammonium ion content is 500~2 000 mg/kg, the compressive strength of cement 3d and 28d is significantly reduced; when fly ash with 30% ammonium content of 2 000 mg/kg was added to P·I52.5 cement, fly ash ammonium ions had little effect on the adaptability of cement and aliphatic superplasticizers, but had a certain impact on the adaptability of cement and polycarboxylic acid superplasticizers.

The cause of high power consumption in a cement plant and the effect of titanium slag on cement strength and strength growth rate were studied when titanium slag was used as cement mixture. The results show that TiO₂ content in titanium slag of cement factory is up to 12.76%, which leads to low activity of titanium slag. Poor grindability of titanium slag is the main reason of high power consumption in cement plant. Under the condition of the same specific surface area, titanium slag has little influence on the early strength of cement, but has obvious influence on the late strength. Under different specific surface area conditions, with the increase of specific surface area, the activity of both ordinary slag and titanium slag increases, while the activity of ordinary slag increases more obviously at 28d, and the activity of titanium slag at 28d increases to a certain extent, but not significantly.

The effects of coarse and fine aggregate of steel slag on the strength, freeze-thaw resistance, permeability resistance and shrinkage resistance of concrete were studied by adjusting the proportion of each component of concrete prepared with steel slag as coarse and fine aggregate. The test results show that steel slag concrete can meet the construction requirements by reasonably determining sand ratio, cementitious material dosage, admixture and other materials, and steel slag as concrete aggregate can significantly improve the microstructure of concrete.

The current status of ORC waste heat power generation technology  at home and abroad is introduced. The ORC waste heat power generation system is a Rankine cycle with low-boiling organic matter as the working fluid. It is a waste heat power generation technology that can efficiently convert low-grade thermal energy into electrical energy. It is mainly composed of three parts: the flue gas waste heat recovery system, oil-organic working fluid heat exchange system and organic working fluid power generation system. Its working principle is the same as that of the SRC waste heat power generation system. By comparing the composition and power generation efficiency of ORC and SRC waste heat power generation systems under different conditions, the selection principles of ORC and SRC waste heat power generation systems are proposed.

The kiln hood seal was reformed by using positive pressure airtight sealing device during maintenance. The positive pressure airtight sealing device has the advantages of simple structure and convenient installation, which can effectively prevent sand and dust, reduce air leakage coefficient, avoid cylinder deformation and long service life of parts. The transformation took only 7 days to be successfully completed. After the transformation, it completely solved the soot emission problem of kiln head under positive pressure, put an end to the phenomenon of air leakage.  The standard coal consumption was reduced by 0.3kg/t.cl, the power consumption was reduced by 0.05~0.10kW·h/ t.cl, and the transformation achieved a good transformation effect.

The rotary kiln of our company's No.2 production line had not been able to bounce up and down freely for a long time, resulting in serious wear on the surface of the pier supporting wheel, aggravating the wear between the wheel belt and the backing plate retaining iron, so the supporting wheel needs to be adjusted. Before adjustment, the collected data of each group of supporting rollers was analyzed to determine the adjustment scheme of supporting rollers; during the adjustment, the value of the dial indicator and the temperature change of each group of supporting rollers was recorded, and the amount of each adjustment was ≯0.1mm. After adjustment, the temperature of each supporting wheel of the rotary kiln is stable, the meshing operation of the wheel belt, supporting wheel and large and small gears is normal, and the rotary kiln can bounce up and down freely.

This paper introduces the integrated detection and service items of clinker trough conveyor inspection and adjustment and maintenance and its significance to the long-term stable operation of clinker trough conveyor.The implementation of the integrated service of groove conveyor inspection, adjustment and maintenance shows that after the integrated service is implemented, the equipment failure rate is greatly reduced, the average operation cycle of rotary kiln system equipment is increased by 15d, and the continuous long period operation quality of rotary kiln system equipment is effectively improved.