Danieli Corus BV | Date: 2017-04-26
A process and a plant for cleaning furnace gas. One or more sensors are used to continuously monitor one or more parameters indicative for an expected temperature peak in the blast furnace gas flow. The gas flow is then passed through a conditioning tower. In case the measured parameter exceeds a predefined limit value, a coolant, such as water, is sprayed into the blast furnace gas flow in the conditioning tower. Subsequently the flow of blast furnace gas passes one or more filter stations.
Danieli Corus BV | Date: 2017-04-26
Process and device for cleaning furnace gas. Flowing in a main flow direction (A) the furnace gas passes an array of bag filters (13). Filtered furnace gas having passed the filter bags, is partly returned via one or more nozzles (28) which are moved along downstream ends of the bag filters. Each bag filter (13) is passed at least once by at least one nozzle (28) during a cycle. A nozzle passing a bag filter blows filtered furnace gas in a backflow direction (B) through said bag filter. The backflow direction is opposite to the main flow direction.
Danieli Corus BV | Date: 2017-05-10
A process and a device for treating a flow of furnace gas with a pressure of more than 1 bar flowing through a channel (3). A powder agent (2), such as a powder comprising alkali reagents, such as lime, and/or absorbents, such as activated coal, is injected under an overpressure into the furnace gas flow via an injector (6) which is positioned centrally within the channel. The powder agent may be fluidized. The pressure for injecting the powder may be adjusted by controlling the volume of fluidization gas vented via a venting outlet (24).
Van Laar R.,Danieli Corus BV |
Iron and Steel Technology | Year: 2013
The fourth campaign of OneSteel Whyalla Blast Furnace started with advanced copper stave coolers in the bosh, belly and lower stack, high-grade silicon carbide and copper plate coolers in the lower bosh, and a high-grade mullite tuyere band. The design included a lower bosh steel shell expansion joint, but no matching refractory expansion joint. The bosh copper stave coolers suffered from erosion after three years of operational life, soon followed by bosh refractory lining and cooling plate failures and serious bosh shell and expansion joint hot spots. The major disruption to operational stability and high risk to safety were caused by bosh hot spots and cooling plate/expansion joint failures. A large number of regular bosh grouting stops were performed, while leaking copper stave coolers required several shutdowns for grouting and installation of internal sleeves. Trials to install copper cigar coolers also took place. The erosion of the bosh copper stave coolers is attributed to descending burden and lack of accretion protection of the bare copper hot face. The copper stave coolers have limited accretion anchoring functionality, and the bosh conical shape contributes to high-pressure loadings, which increase the erosion rates. There was no evidence of high-temperature softening or melting effects of the copper as all instrumentation data confirmed outstanding performance of the water cooling system. The lower bosh silicon carbide refractory cannot cope with high temperatures unless appropriate expansion provisions are utilized. Silicon carbide compressibility is very low, and this could cause cracking at temperatures around 200°C. The silicon carbide stress levels were high due to vertical constraints by the mullite tuyere band and bosh copper stave coolers. Also, the steel shell expansion joint is positioned at a critical elevation. Lower bosh silicon carbide refractory introduces a risk with regard to stress cracking, leading to loss of the refractory, and exposes the copper plate coolers and shell plate to high temperatures. The design caused high stresses and cracking of the copper plate coolers close to the shell. With the loss of refractory, the lower bosh steel shell expansion joint became exposed to high temperatures causing significant deformation and cracking. Eventually, the lower bosh expansion joint failures led to the decision toward a long-term campaign extension repair strategy and justification. A Hoogovens tuyere band, bosh and belly design was implemented, as many similar designs have been installed at comparable blast furnaces with a bosh expansion joint. It was decided to install new copper stave coolers in the lower stack and include an additional hot face lining of graphite and silicon carbide to provide a smooth transition of the belly Hoogovens lining to the middle stack cast-iron stave coolers. The post-mortem analysis confirmed the hypothesis regarding failures of the copper stave coolers and the lower bosh. This analysis also confirmed the decision to combine the Hoogovens tuyere band, bosh and belly together with the advanced lower stack copper stave coolers, as the observed lower stack copper stave cooler erosion was limited.
Schrama F.,Danieli Corus BV |
Van Den Berg B.,Danieli Corus BV |
Van Hattum G.,Danieli Corus BV
Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015 | Year: 2015
The current market demands desulphurized steel. Steelmakers worldwide agree that the most efficient and cost effective solution in BOF steelmaking is to desulphurize the hot metal between the blast furnace and converter. Various methods are currently in use for hot metal desulphurization. Among these methods the Kanbara Reactor (KR) process (using only lime as a reagent), the Magnesium mono-injection process (using only magnesium as a reagent; also known as the Ukraina Desmag process) and the coinjection process (using magnesium and lime/CaC2 as reagents) are worldwide the most popular. These three hot metal desulphurization methods are compared based on metallurgy, efficiency, costs and overall performance. Both available data from literature and experience from Danieli Corus engineers is used for this study. The KR process is able to reach low sulphur concentrations (> 10ppm) in hot metal and has lower reagent costs. However, due to higher Fe-loss and heavy wear the KR process has the highest operational costs. The Magnesium mono-injection process is very fast due to the use of the reactive magnesium as reagent. Major problems with resulphurization (sulphur levels below 50ppm cannot be reached) and the violence of the process made that this process (which originates from the former USSR) could never get a firm foothold in the western steel industry. The co-injection process with magnesium and lime proves to be able to combine the best of both worlds. It can reach low sulphur concentrations and desulphurize fast. Co-injection is also the most flexible cost effective method in the market. Therefore this process is still viewed as the standard practice in the world of BOF steelmaking.
Klut P.,Danieli Corus BV |
Turco T.,Danieli Corus BV |
Ewalts W.,Danieli Corus BV |
Dupon E.,Danieli Corus BV
TMS Light Metals | Year: 2016
There was an existing cooling tower at Alcoa Aluminerie de Becancour that had to be replaced by a new improved type to cope with process conditions which had changed since its inception in 1985. The increased volume of Anode Bake Furnace (ABF) fiimes, altered pitch burning conditions, anode recipe and the rise in elements such as vanadium and sulfur in the petroleum cokes demanded a larger modern Conditioning Tower design. Danieli Corus (DC) was contracted by the owner's engineer, Hatch Ltd, to design, supply and deliver the new tower to Aluminerie de Becancour Incorporated (ABI).
Danieli Corus BV | Date: 2015-04-08
An apparatus (1) is disclosed for the removal of gasses from electrolysis cells (3) by suction comprising a branch duct (5) for each electrolysis cell, a ductwork (4) connecting the branch ducts to a gas treatment centre (9), a central suction fan (11) providing a gas flow in the ducts, and a heat exchanger (15) arranged in the gas flow. The heat exchanger comprises one or more heat exchanger elements (17) in at least one of the branch ducts and the ductwork. One or more of the heat exchanger elements are removably arranged in the at least one of the branch ducts and the ductwork and/or the heat exchanger comprises a plate heat exchanger (15) comprising one or more heat exchanger plates (17).
Danieli Corus BV | Date: 2014-04-25
A method of conditioning particulate material and/or a gas is provided, comprising the steps of: feeding an amount of particulate material up to a filling level into in an inner volume of a silo having silo walls, a gas inlet and a gas outlet, and generating a gas flow of a gas from the gas inlet through the particulate material to the gas outlet which comprises applying suction to the inner volume of the silo through the gas outlet, wherein the gas outlet is located in a silo wall below the filling level and covered by the particulate material. A system is also provided.
Danieli Corus BV | Date: 2014-10-29
A method of conditioning particulate material (M) and/or a gas is provided, comprising the steps of: feeding an amount of particulate material up to a filling level (L) into in an inner volume (V) of a silo (3) having silo walls (5), a gas inlet (13) and a gas outlet (11), and generating a gas flow (F) of a gas from the gas inlet through the particulate material to the gas outlet which comprises applying suction to the inner volume of the silo through the gas outlet, wherein the gas outlet is located in a silo wall below the filling level and covered by the particulate material. A system is also provided.
Danieli Corus BV | Date: 2010-11-10
The invention concerns an apparatus and a method for the removal of gasses from electrolysis cells (21) by suction, the apparatus comprising a branch duct (3) for each electrolysis cell, a main duct (4) connecting the branch ducts to a gas treatment centre (5) and a central suction fan (6) providing for at least part of the suction, wherein one or more of the branch ducts are provided with supplementary suction means (8) and wherein control means (9) to control the supplementary suction means and pressure monitor means are provided, wherein the control means are adapted to control the supplementary suction means in dependence from changes in the monitored pressure with respect to a reference pressure.