In experience of reviewing technical journals,the problems in manuscript papers submitted are analyzed,topic selection and wiring logic in the technical journals are discussed,the importance of logical thinking in the paper writing is demonstrated,which would provide references and clues in writing this kind of papers.It is well known that logical thinking plays a directive role in writing,much attention therefore shall be paid to the logical thinking in writing the technical papers so that academic level and writing quality can be upgraded by grasping correct topic selection and writing skills.

Coal source can be fixed based on determination for each quality index of the candidate sources.Cokemaking tests for several coal blends are also conducted by using experimental oven.The optimized coal blending composition for PW-7.2m top-charge coke oven can be decided since the coke quality can meet the requirement of 5 100m³ blast furnace production.

Properties of gas coal from different coal mines are analyzed by comparing the coal qualities of similar value G and Y.Coal blending test for cokemaking is conducted to study the differences in coke properties produced from gas coal.The result shows that coal vitrinite reflectance,logarithm of fluidity degree and plastic zone of fluidity play a dominant role in hot strength of coke.Since the gas coal has high plastic mass,good fluidity and high reflectance,it can appropriately be increased during coal blending.

The major problems in charging operation  for 7.63m coke oven are analyzed.Optimization for 7.63m coke oven smokeless charging is put forwarded in aspects of charging amount calculation,coal leveling control mode,secondary make-up setting,charging time control,and leveling bar optimization so that production can be improved,such as a stable charging operation,increased charging amount,less spillage coal amount,stabilized coal line and minimized emission leakage.

This paper studies the intrinsic law and characteristics of coke micro pore structure by introducing fractal theory so as to demonstrate the correlation between the coke CRI and fractal dimension variation.The coke pore structures before and after reaction are measured by adopting mercury penetration method so that the coke micro pore structure change due to CO2 erosion can be analyzed and a new solution to the coke melting is given.

A suitable hot repair method can be selected for stamp-charge coke oven based on the experience of using several hot repairs with aims at solving the problems in the stamp-charge coke oven, such as serious erosion and penetration on the heating wall so that a stable and satisfactory production can be ensured.

Conventional and optimized replacement for water jacket for 200t/h CDQ unit are discussed.The optimized solution for replacement can be cut down to 36 hours,much shorter than the conventional solution.Besides,it has less man power,higher efficiency and much lower safety risk.

Obstacles affecting 2# CDQ unit production are introduced.The dry quenching rate for 2# CDQ unit is calibrated on site,including technical modifications.The modified 2# CDQ unit has a lower temperature of the coke discharged,uniformly distributed coke and higher coke discharging capacity,etc.,with dry quenching rate increased from 88.68% up to more than 93%.The CDQ capacity is gradually increased.

The cause of 2# CDQ boiler tube bursting in Coking Plant of Xinyu Iron & Steel is analyzed.Its preventive measures are also given，such as by stabilizing the boiler operation，improving chemical dosing，controlling demineralized water quality and periodically doing maintenance for the boiler，so that the CDQ unit can run in a stable manner.

In this paper a solution of capacity expansion and performance improvement for 140t/h CDQ unit is introduced.After the expansion,the CDQ unit would have a capacity up to 150t/h;with increase of flue numbers in the CDQ chamber,the corbel zone would have a longer service life;upon replacement of the chamber-top water seal pot,charging device and cooling jacket,etc.,its performance can be improved.

Manual unloading spillage coal procedures for 7.63m coke oven pusher machine are introduced.Interlock conditions of unloading the spillage coal are also analyzed in this paper.Automatic spillage coal unloading operation can be realized by writing program for elimination of hidden danger as well as for higher working efficiency and automation level.

Scheme and technical advantages of on-line analyzing system for coke grain size grade are described,including its all functions.This system is widely used,which plays a prominent role in improving safety and automation level.

Tubular belt conveyor would have tube expanding at the end during coal conveying if it is overloaded.For stable operation,the upstream of the tubular belt conveyor is equipped with material flow limiting device to control the volume of passing material no exceeding the effective volume of the conveyor for safe purpose.

 In view of the fact that deSOx and deNOx devices change waste gas flue suction, it may cause influence to the coke oven heating system.This paper studies how to ensure safe and stable operation of the coke oven heating system in case of failure of deSOx and deNOx blowers and proposes a solution.

This paper introduces a new H₂SO₄ making technology by adopting “rich oxygen combustion” and “twice conversion & twice absorption” processes in treatment of low purity sulfur and secondary salt waste liquor produced from COG desulfurization by wet catalytic oxidation. Operating conditions after commissioning are also  introduced.

In case serious blockage and high resistance in the primary cooler would cause low efficiency for naphthalene removal in gas purification system.This paper introduces the solutions such as by upgrading process and by optimizing operation,etc.to improve the naphthalene removal efficiency for the primary cooler so as to ensure gas delivery in a safe way.

In this paper processes of COG desulphuration and decyanation are introduced and the principle & process flow of NNF method desulphruization and decyanation are described.The features and advantages of this NNF process are summarized.A new concept of future optimum design for its equipment is also proposed.

Problems in spray type saturater process for ammonium sulfate production are introduced.Part of ammonium sulfate production processes are optimized so that the saturater service life can be extended,labor intensity can be alleviated and gas quality can be ensured.

To meet the increasingly strict environmental requirement,zero liquid discharge (ZLD) for coking waste water treatment becomes the focus in coking industry research.After Baosteel Zhanjiang put into production,by cutting the raw water amount and by recycling the waste water,the ZLD can be achievable.

Based on the experiences in production,difficulties and problems in pressure measurement for crude benzol distillation under negative pressure are discussed.Comparison is made between advantages and disadvantages for various kinds of pressure measurements under high temperature and negative pressure.Feasible solutions are also given.

The principle of determination of wash oil distillation range by gas chromatography is introduced in this paper.The determination method is discussed.Comparison is made between the gas chromatography method and distillation method.The result shows that the gas chromatography has a quicker determining speed and higher accuracy,which can guide production in a more efficient manner.

This paper introduces the improvement of desulfurization-regeneration and tail gas treatment by adding pre-mixing nozzle and auxiliary facilities.This optimization can reduce the energy consumption of the regenerative air compressor and increase the oxygen availability in the regenerative air.The recycling of the regenerated tail gas to the outlet gas line of the H2S scrubber can minimize environment pollution of the tail gas to the atmosphere.

Steam heater replacing tubular furnace in crude benzol distillation unit is introduced in this paper.Two types of heating are compared in aspects of operation,maintenance,equipment investment and construction cost,etc..The result shows that the steam heater is superior to the tubular furnace in safety performance and environmental level,so it is suitable for the crude benzol distillation unit.

The working principle of ZL type scrubber cleaning agent is studied, which is used for reducing the resistance in H₂S scrubber from 2.38kPa down to 0.64kPa so as to avoid shutdown for packings replacement and to have a higher operating efficiency and a significant economic result.