Fossil fuels produce a large amount of carbon dioxide during use，while hydrogen energy only produces water，which is expected to replace fossil fuels and will be widely used in many fields. This paper introduces current status of hydrogen preparation and research progress in the fields of lowcarbon metallurgy，new energy vehicles，biomedicine and preparation of high-purity materials，and some development suggestions are proposed

This paper evaluated and estimated the emission peak of the coking industry based on its volume and energy efficiency. It offers carbon reduction pathways such as improving resource utilization efficiency and enterprise energy efficiency，promoting chemical measures to fix carbon，developing low-carbon circular economy，managing carbon emission reduction，and utilizing renewable energy，etc..

This paper presents a method for preparing metallurgical formed coke from low rank coal in high proportion. Low rank coal，semi-coke from low rank coal，bituminous coal with some binding capacity and coal asphalt are uniformly mixed and pressed into coal briquette by high-pressure pelletizing machine with linear pressure ≥200 kN/cm. The high-pressure coal briquette becomes metallurgical formed coke after dry distillation at about 1 050 ℃. The test result shows that the compressive strength of the metallurgical formed coke is more than 5 000 N，with CRI 54% and CSR 65%，which can be used as metallurgical coke.

 Coal blending plays a key role in the production of a coking plant. In the iron and steel industry，CSR and CRI indexes of coke at high temperature are of particular importance. In order to improve traditional coal blending process that relies on expert experience，the idea of predicting coke quality based on raw coal indexes has been put forward. This article aims to analyze some coke quality prediction methods at home and abroad and improve the existing deficiencies. Taking Phase I and II projects of Xilaifeng coking plant as an example，this article conducts intelligent analysis, using SVR model，on CSR and CRI indexes of coke. By showing the relationship between training sample proportion and prediction accuracy，it further points out research orientation of coke quality prediction work.

This paper shows the frequency of each reflectance interval and the method of generating a vitrinite reflectivity distribution chart of mixed coal based on histogram generation principles and the vitrinite reflectivity distribution of single coal. It calculates average vitrinite reflectance（Rr） and standard deviations（S）of mixed coal under different ratios and generates a vitrinite reflectivity distribution chart so to save time and cost of laboratory work，which could be widely applied in coal blending and coking-coal mixing process.

The APS hydraulic clamping arm on CDQ is an important equipment to connect the coke bucket and crane，mainly to force the quenching car into position after the initial alignment. During operation，damage often occurs when the APS hydraulic clamping arm suddenly lifts and collides with the coke bucket. Adding an audible and visual alarm to the front of the quenching car provides obvious and clear feedback to the operator’s operation so as to avoid collisions.

This article discusses about difficult separation of gas，dust and tar from raw gas in dry distillation of pulverized coal，and presents detailed introduction to technical principles and process flow of moving granular bed technology. In coal dry distillation，the application of moving granular bed solves the difficulty in gas-dust-tar separation and realizes stable operation in the system.

There are high content of phosphorus and COD, exceeding the standard in recirculating cooling water system，which is prone to cause scaling and corrosion of heat exchange equipment. Therefore，biological agents is used to improve the quality of recirculating cooling water. The results shows that the contents of COD，ammonia nitrogen, chloride ion and total phosphorus have decreased drastically，the removal rates reached 92%，95%，57% and 73% respectively. It is important that the discharge of sewage and phosphorus significantly decreased，and the proportion of make-up water decreased from 30% to 10%，a good economic and social benefit is achieved.

By measuring bulk density and true relative density of raw coal under different conditions of moisture and particle sizes through a period，this paper collects and analyses testing data by using mathematical and statistical methods such as the Grubbs test and binary linear regression. It verified the binary linear relationship between coal moisture/coal particle size and bulk density based on the experimental data of true relative density of coal.

Aiming at the three major problems of the traditional refractory raw material warehouse： low level of automation，technical equipment and management informatization，this paper proposed an intelligent storage and management system for refractory raw materials. Through the establishment of the automatic three-dimensional warehouse model and SNHGES system，an intelligent，unmanned and intensive management of the refractory raw material warehouse will be realized, this will infuse the full automatic production：from refractory raw materials to refractory products.

Desulfurization waste liquid has long been treated mainly by blending into coal for cokemaking as well as by salt extracting. With the development of technology and optimization by design institute，construction company and endusers，acid-making has become the main way of treating desulfurization waste liquid today. It not only treats the waste liquid but also effectively turns the waste into valuable products，which reduces the operating cost of the enterprise.

The resource utilization of by-product gas is a critical path to realize the energy conservation and emission reduction of integrated iron & steel works．This paper introduces characteristics of byproduct gas with deep purification technology and resource utilization technology of producing chemical products from by-product gas，key application cases are also listed．It is pointed out that the resource utilization of by-product gas has great advantages and its future development trend is briefly described.

This paper analyzed the overall operating conditions of benzol stripper and studied the effect of operating parameters on Cl- content in crude benzol．According to the actual situation and in order to ensure that the Cl- content in crude benzene reaches the standard，the stripper top temperature should be controlled at about 80 ℃，the stripper top pressure at about -30 kPa，and the bottom pressure at about -20 kPa．The research shows that the amount of steam added and the reflux flow rate are inversely proportional to the Cl- content in crude benzol．The overall change trend of Cl- content of lean and rich oil is the same as that of crude benzol．

The causes and mechanisms of abnormally colored products such as blue and pink in the production of ammonium sulfate in the spray saturator were analyzed．The key reason was found that the proportion of impurities such as phenol and cyanide contained in ammonia vapor during the ammonia stripping was locally too large，making the acidity uncontrolled，and the prussian and quinone adhered to the product，resulting in abnormal color of the product．The amount of ammonia stripping is adjusted according to the output of the coke oven so that it can be produced continuously．By such an optimized operation，the problem of abnormal ammonium sulfate products is solved.

A long distance steam pipeline is considered as a whole. The pressure loss of the pipeline is calculated by friction theory and the temperature drop is calculated by heat dissipation from insulation layer and a method of equal enthalpy pressure drop. As a result，the calculated value is smaller than the measured value. To solve the problem，a temperature-pressure coupling segmentation calculation strategy is proposed. The pressure loss calculation method still uses friction theory，while the temperature drop calculation method takes into account three factors: heat dissipation from insulation layer，equal enthalpy pressure drop and heat dissipation from supports. The way of decoupling is to calculate the pressure loss first，and then the temperature drop is calculated. After these improvements，the calculated pressure loss and temperature drop basically match with the measured values，which satisfies the required accuracy of the project.

From the perspective of coke oven maintenance，this paper discusses the causes and control measures for the excessive emission of NMHC from coke oven flue gas. A series of source control measures are introduced，which can effectively reduce the emission of NMHC in coke oven flue gas. The common problems in coke oven maintenance are pointed out，which is beneficial to cokemaking corporates to cut unnecessary investment，diversify maintenance means and improve management level.

This paper mainly introduces the application and operation of the stress-free coil type heat recovery device form ascension pipe introduced in the revamping of No.5 and No.6 coke ovens of Baotou Steel. During the operation time of 2 years, the device operates stably and can efficiently recover the sensible heat of raw gas, which improves the energy saving rate of coke oven and has significant economic benefits.

Introduction is made to a new type of sedimentation tank used in waste quenching water treatment, with the characteristics of high slenderness ratio and small land occupation, which features in high surface load and thick suspended sludge layer inside. Making use of return sludge as the substitute for coagulant, the sedimentation tank gives full play to coagulation effect and reduce the amount of added coagulants, helping to stabilize the water disposal procedure and enhance the quality of discharge water.