Silica Brick for Coke Oven

This standard specifies the classification,specification, test method, quality appraisal procedure,labeling, packing, transportation, storage and quality certification of silica brick for coke oven.     

Hong Kong E-Life Purchases Shanxi Coke Enterprises

Talks on the purchase of several cokeenterprises in Shanxi by Hong Kong E-Life International Limited have enteredthe substantial stage.Since last yearthis listed company in Hong Kong hasacted as an agent of some coke enter-prises in Shanxi for their productexport.It has fixed more than a dozen     

Methanol Production from Coke Oven Gas

Northwest Research Institute of Chemi-cal Industry on June 9,on the basis ofthe research on hydro-desulfurizationcatalysts has developed the coke over gashydro-purification process and catalyst,In the research of coke oven gas hydro-desulfurization catalyst,new technologyis used to modify catalyst carriers andadjust active components.Owing to theexcellent property of the catalyst in side-reaction inhibition,restriction imposed     

Study and Application of Sealing Material for Coke Oven Chamber

1IntroductionSome coke ovens have been in operation for over20years in Baosteel,cracks and leaks are found in thesilica brick walls and roofs of coke oven.The existenceof cracks causes the emission of smoke from ovens,which may probably affect the service life of oven.Thewall surface is often destroyed by the extension ofcracks,resulting in eventual shutdown of the oven.Inorder to obtain stable coke oven operation over a longterm,many kinds of repair techniques,such as hot re-pairing,gunning,…     

Chinese Standard on Refractories——Silica Brick for Coke Oven

1 Scope This standard specifies the classification, specification, test method, quality appraisal procedure, labeling, packing, transportation, storage and quality certification of silica brick for coke oven. This standard is used for the silica brick for coke oven, and also used for silica brick for carbon calciner.     

Development and Application of Zero Expansion Silica Brick for Hot Repairing of Coke Oven

In order to meet the needs of hot repairing technology of coke oven,the zero expansion silica brick with super properties has been developed,and the problem of poor thermal stability of common silica brick has been overcomed.This product can be directly used after being rapidly heated after construction.At present,it has been applied in coke ovens in Italy and Baosteel.     

Specific Features of Thermochemical Processes in High‐Temperature Coke of Polymer Composite Materials

The temperature fields in coked layers of polymer composite materials (fiberglass plastics) under hightemperature heating and subsequent cooling in a cold oxidizer flow are experimentally studied. Based on the analysis of experimental data and numerical research, it is shown that exothermal chemical reactions can proceed in the coked layer of fiberglass plastics, which creates conditions for maintaining high temperatures in the compositecoke layer during a rather long time.     

Coke formation on an industrial reforming Pt–Sn/γ‐Al2O3 catalyst

The characterization of the coke deposited on an industrial Pt–Sn/γ‐Al₂O₃ catalyst, used in a continuous reforming process, was performed with AFM, XRD, FTIR, EPR, NMR, TG‐DTG and DTA techniques. Composition, structure and location of the coke on the catalyst were investigated. The coke was predominantly deposited on the catalyst surface and in the interstices between the catalyst particles. Its content increased along the reactor from top to bottom. Coke was deposited in the form of uniform films and clusters of three‐dimensional disks with diameters between 0.12 and 0.18 μm. It had a pseudo‐graphite structure produced by the dehydrogenation and polymerization of the aromatic precursor compounds. The coked catalyst showed a good combustion behavior; it was regenerated below 550°C. These results are important to elucidate the coke formation mechanism, to generate new continuous reforming catalysts, and to optimize the reactor operation parameters. This revised version was published online in July 2006 with corrections to the Cover Date.     

High Resistance of Cu–Ferrierite to Coke Formation During NH3-SCR in the Presence of n-Decane

Selective catalytic reduction of NO _x by NH₃ over Cu–FER and Cu–ZSM-5 in the presence of n-decane and SO₂ was investigated. NO _x conversion over Cu–ZSM-5 decreased in the presence of n-decane, owing to inhibition of the active sites by coke formation. In contrast, coke formation was negligible over Cu–FER, which maintained its NO _x conversion activity even in the presence of decane. Coke formation was negligible over H–ZSM-5 and H–FER supports, which suggests that Cu species were involved in coke formation. Temperature-programmed reduction by H₂ and electron spin resonance spectroscopy indicated that [Cu–O–Cu]²⁺ was probably the Cu species involved in coke formation over Cu–ZSM-5.     

Coke removal from deactivated Co–Ni steam reforming catalyst using different gasifying agents: An analysis of the gas–solid reaction kinetics

The reactivity of various gases, namely; O₂, air, CO₂, H₂ and N₂, with carbon deposited on alumina-supported Co–Ni catalyst during propane reforming in a fluidized bed reactor at 773–973 K using relatively low feed steam:carbon ratio (0.8–1.5) has been investigated in a thermogravimetric analysis unit. Analysis of the transient solid weight loss revealed that carbon removal mechanism is dependent on the type of gasifying agent. Carbon gasification kinetics using O₂ and air followed the Avrami-Erofeev (A2) model while data for both CO₂ and H₂ were captured by the geometrical (contracting area, R2) model. However, carbon gasification with inert N₂ proceeded at much slower rate (about 10 times lower than air) and was adequately fitted by the one-dimensional diffusion (D1) model. Specific reaction rates from these phenomenological models were also linearly correlated with the catalyst carbon content with reactivity coefficient of the gasifying agent decreasing in the order, O₂ > air > CO₂ > H₂ > N₂. In order to minimize energy consumption during catalyst regeneration, reduce greenhouse gas emissions and reduce catalyst sintering, it would be desirable to employ a mixture of air and CO₂ as the carbon gasifying agent to take advantage of the coupled exothermic (air oxidation) and endothermic (reverse Boudouard reaction involving CO₂ and carbon) nature taking place during the carbon removal operation.