This paper summarizes physical and chemical properties of semi-coke，discusses research
progress of semi-coke injection into blast furnace，and elaborates the trend of semi-coke application
in blast furnace injection technology. Semi coke，as a kind of secondary clean energy，can meet the
requirement of blast furnace injection，and has great potential in blast furnace production. But relevant
process and equipment need to be improved for successful blast furnace injection.

By developing new technologies of high-deficiency and energy-saving for COG-fired
battery，hot repair for oven refractory and red coke for CDQ heating-up，it comes with remarkable
effects，such as higher equipment capacity，greatly-reduced pollutants and much lower energy
consumption.

Abstract：Baosteel Zhanjiang iron and steel plant phase 3 newly built 2×65 top charging
compound coke oven battery with oven chamber height and width of 7 m and 530 mm respectively，
the oven machine automation is realized through application of the technologies such as manless
operation，intelligent anti-collision，area prevention and control，safety interlock，wireless
technology，cluster operation mode，bridged coke inspection. Combined with the explosion-proof
reversing machine，basement inspection robot，heat recovery of standpipe，the automatic opening
and closing of the standpipe and the net coking detection technology. As as result，the manless
operation of the coke oven is realized，and the feasibility of manless operation on the oven machine
is analyzed.

After research and experiment，it
,
s found that the large amount of solid wastes such as
tar residue，biological sludge and collected dust produced from coking plant of Hangang west zone
can be blended and pressed in lump blocks according to blending ratio（dust accounts for 85%），
and then coal is blended with the pressed blocks and used for cokemaking. In production，coking
wastes are utilized as a kind of resource，which meets the prevailing environmental requirements.
Coal blending resources are expanded for cokemaking，bringing hu ge economic and social b enefits.
T h e a p p l i c a t i o n o f s o l i d w a s t e s a s c o a l b l e n d i n g r e s o u r c e s h a s b r i g h t p r o s p e c t s i n c o k i n g industry.

Anning branch of Yunnan Coal and Energy Co.，Ltd. faces problems of low quality rate and
great fluctuation of blending coal fineness. Pilot oven test is conducted to study the co-relations between
fineness of individual coal and blended coal and CSR. Fineness of blended coal is improved by adjusting
the VFD of No.3 crusher to 39 Hz. For 6m top charging battery, the closer the blended coal fineness is to
76%，the better the CSR will be.

This study conducts a comprehensive evaluation of the quality parameters of Indonesian coal.
Drawing on the company,s coal resources，it compares the quality of Indonesian coal with that of fat
coal，coking coal，and 1/3 coking coal，thereby dissecting their respective strengths and weaknesses.
The study attempts to substitute a portion of the 1/3 coking coal and coking coal with Indonesian coal in
the coal blending for coking purposes. The findings indicate that the utilization of Indonesian coal as 1/3
coking coal in coal blending not only stabilizes the quality of the coke but also contributes to a reduction
in ash content.

Improving the quality of the prime coking coal and 1/3 coking coal is beneficial for reducing
the cost of coal blending for cokemaking. This paper expounds the coal blending proposal for increasing
the proportion of gas coal. It has reference value in terms of saving high-quality coking coal and
reducing the cost of coal blending.

The service life of coke oven battery is around 25 years. At the late stage of service life，
the battery gradually ages，oven walls suffer deformation and erosion due to long-term temperature
fluctuations，mechanical impact and friction，especially after battery shutdown-cooling，the refractory
brickwork is severely damaged，which seriously affects stable production of coke oven. Therefore，it is
of great significance to do a good job in battery protection fo r longer service life of the battery.

Shanxi Xinggao Energy Co.，Ltd. currently uses the QRD-2000 environment-friendly stampcharging
horizontal heat recovery coke oven with side coal charging and coke pushing. The plant has
been in continuous and stable production for over ten years，but long-term high-temperature operation
has caused some components of the coke oven to crack，affecting its overall tightness，integrity，
and safety. The plant successfully replaced the upper flash plate of the coke oven without stopping
production or shutting down the oven，ensuring its continuous and efficient operation，and filling the
gap in the hot repair technology of coke ovens of the same type .

This paper analyzes the causes of pusher side oven door damage，the service life of pusher
side oven door has been improved and flame and emission from oven door become less by adding
crossbar to leveler door linner，improving the structure of the oven door web and the installation method
of P.S. oven door，which plays a significant role in environment al protection and energy saving.

New c leaning t echnology i s a dopted f or re moving de posits i n g as pi pelines unde r ne gative
pressure to handle the blockage. Normal production is not interrupted while solving the operation
problem. This technology helps to save costs and ensure operation safety，with no need of access
into the pipes for manual cleaning. Deposits in gas pipes can be removed thoroughly and efficiently.
The new technology provides great experience to be shared in co king industry.

Through application of spiral groove tube and bare tube in primary gas cooler（PGC）
model，this paper analyzes performance，coefficient of heat transfer and pressure drop of both tubes，
and illustrates the advantages and feasibility of spiral groove tube replacing bare tube in PGC.

The crude phenol plant with concentrated sulfuric acid method is upgraded to solve problems
that occurred in coal tar refinery plant. Improvement is done，i.e. pH sensor，temperature sensor，flow
meter and control valve are added based on existing decomposer. Fuzzy control algorithm is adopted to
automatically control the additional amount of sulfuric acid in crude phenol production. After upgradation
of the plant，the quality of crude phenol is ensured even under full-load operation. In addition，acid
mist generation and phenolic product losses carried away by aci d mist are dramatically reduced.

The direct and indirect ammonia stripping processes to treat coal water were applied. The
quality of the ammonia wastewater after treatment is tested，and the conditions required for the two
processes are studied. The study reveals that the direct ammonia stripping process has a hydrolysis
effect on cyanides，effectively mitigating the corrosion of equipment by cyanides. Conversely，the
indirect ammonia stripping process is characterized by its low wastewater generation. Therefore，the
selection of the ammonia stripping process should be determined according to specific conditions in the
gas purification process.

The operation and existing problems of two methods of coke oven flue gas purification in
WISCO are analyzed respectively，advantages and disadvantages are introduced，and corresponding
improvement measures are proposed，which can be used for reference on construction and operation of
flue gas purification devices.

Preventing carbonaceous deposits is essential for the normal operation of the coke oven
during waste heat recovery process from stand pipe. This prevention is accomplished by managing
the temperature of the interior wall on the stand pipe and isolating the stand pipe metal from raw
gas. The development of effective temperature control strategies is a complex task requiring a
thorough analysis of influencing factors，coupled with practical implementation.

This paper mainly introduces the operation impact on coke oven，decanter，alkali adding
of ammonia stripper and other equipment on COD content of stripped water. COD content in stripped
water is reduced significantly by taking targeted measures，which helps to guarantee long-term stable
operation of biochemical system，bringing great environmental be nefits.

The A2/O technology is adopted by Baicheng Zhongtai Coking Co.，Ltd. to treat coking
wastewater，with solid sodium carbonate being used as the pH regulation agent. However，the solid
nature of sodium carbonate can result in issues such as lag in adjustments leading to surpassing
of standard pH levels as well as considerable manual effort during the process. Experiments have
found that using a 30% solution of NaOH instead of solid Na2CO3 to adjust the pH of wastewater can
effectively solve the drawbacks of the original process，achieve excellent regulation effects，and save
approximately 400 000 yuan in wastewater treatment cost each ye ar.

This paper analyzes the problems in coking industry under the background of low-carbon
strategy，and specifies the development trend of coking technology. It also introduces energy saving and
emission control technologies，including waste heat recovery of raw gas in standpipe，oven chamber
pressure adjustment and ammonia stripping by heat pump，etc.，which will guide research trend for
reducing carbon emissions and promoting low-carbon development in coking industry.