Cdq is a system to cool the hot coke brought out of coke ovens at a temperature of. Reliable information about the coronavirus covid19 is available from the world health organization current situation, international travel. Coke dry quenching for iron and steel sector climate. Coke oven machines coke dry quenching bucket cars the cdq bucket car receives the coke from the oven in its rotating bucket and transports the bucket with coke to the cdq plant. Oclcs webjunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus. The coke wet quenching has following disadvantages1the sensible heat of coke is lost to the atmosphere. Incandescent coke in the oven waiting to be pushed. Funnel covers the charging port camera extinguishing. Coke dry quenching latest breaking news, pictures, videos, and special reports from the economic times. Being of robust design, the quenching cars offer the advantage of easily exchangeable wearing parts. In addition, brittle portions of coke are removed when it drops in the chamber. Volume model vm and shrinking core model scm were used to calculate the kinetic.
Dry quenching system through the strategic alliance with ihi corporation within the joint venture paul wurth ihi, the group offers coke dry quenching cdq technology, relying on a proven track record of cdq plants. Then by the use of the recovered heat, produce hightemperature and highpressure steam in a boiler. Cdq is a system to recover the sensible heat of red hot coke by means of inert gas. Coke dry quenching waste energy recovery project by.
Coke dry quenching cdq system nippon steel engineering. An improved coke handling and quenching apparatus and method comprising a coke box for receiving, cooling and carrying a coke charge from a coke oven in a pollutionfree manner and a highly maneuverable selfpropelled carrier vehicle for transporting and maneuvering the coke box, the carrier having an upper tilt frame for supporting and dumping the coke box and apparatus for maneuvering. Both machines can be selfpropelled or locomotive driven. Schematic comparison between wet and dry quenching of hot coke. Compared with wet quenching, coke dry quenching technology can increase the m40 and m10 of coke by 38% and 0. The oven has just been pushed and railroad car is full of incandescent coke that will now be taken to the quench station. Cooling of hot coke by using inert gas is known as coke dry quenching and is available as an alternate quenching metod. Pdf exergy analysis of a coke dry quenching system.
Conventional wet quenching can be fixed or tilting bed design machines. Coke dry quenching cdq process has been successfully applied in the no. Tata steel sets up coke dry quenching facility at odisha. The steam carries cynide,sulphide,phenol and dust in the atmosphere. Cdq coke dry quenching is a widely used method for recovering waste heat in the steel industry. In addition, heat is recovered in the form of steam, from the redhot coke. Coke dry quenching traditionally dry quenching process is being adopted for the cooling of coke produced from the coke oven battery in steel plants. Model predictive control for improving waste heat recovery in coke. Coke oven coke dry quenching plant tbwes is a pioneer in the field of waste heat recovery boilers for nonrecovery type coke ovens coke dry quenching cdq plants and is one of the largest suppliers of such boilers in the world. In summary, the dry quenching of coke introduced in 1976 is now used at a number of plants. China meishan coke dry quenching project english abstract. China meishan coke dry quenching project english the. To demonstrate the superiority of the cdq process over the traditional coke wet quenching cwq process5 in. Cdq also improves the quality of coke and enables reduced coke consumption in the blast furnace.
Coke dry quenching cdq is an energy saving process used during the production of coke in the coke oven battery. The coke oven consists of plate like carbonization chambers alternately arranged in a sandwich form to. In claimed embodiments, claims include the cooling process may be continuous instead of intermittent. Book 9, lines 38994 of homers odyssey is widely cited as an early, possibly the first, written reference to quenching. Thermodynamic analysis of a coke dry quenching unit request pdf. The objective of the meishan coke dry quenching project for china is to reduce carbon dioxide c02 emissions by displacing electricity consumption at a large iron and steel company compared with the baseline scenario coke wet quenching cwq, and purchase. Boot device installation dry quenching of coke contains reference tables, the truck is driven, the ducts of the exhaust gas and the funnel. Nsengi formosa ha tinh steels second blast furnace started operations in may 2018. The coke oven plants in jsw have been operating from 4 years as per earlier announcements by jsw. The distinct advantages of the system include energy conservation, pollution reduction, coke quality improvement and full use of resources. Factors affecting the dry quenching of coke springerlink.
A cdq plant is also called coke dry cooling plant cdcp. At the cdq, the crane will pick up the loaded bucket, empty it into the cooling shaft and will return the empty bucket to. Paul wurths coke oven machinery portfolio also includes coke dry quenching bucket. Coke dry quenching cdq is a heat recovery system to quench red hot coke from a coke oven to a temperature appropriate for transportation. De4028142a1 wet quenching for hot coke from coking ovens. Coke dry cooling plant cdcp coke dry quenching plant cdq live model. To get more insight into the energy utilization efficiency of the cdq system, the exergy analysis methodology based on the first and second laws of thermodynamics was proposed in this study, and the exergy. Hover tap highlighted features for more information.
The quenching in cold nitrogen takes place outside the coke oven s and heated nitrogen is used energetically. Coke dry quenching 3 main specifications of cdq plant no. It is one of the most renowned energyefficient and environmentfriendly facility in steel production where hot coke removed from coke ovens at a temperature of. Electric resistance reduction furnace was used to heat the sample. Comparison of dry quenched coke with wet quenched coke for. Innovations in the dry quenching of coke springerlink. Incandescent coke exposed to partial combustion due to presence of excess oxygen in cooling chamber of coke dry quenching. Characteristic and kinetics of oxidation of coke by co 2. Numerous and frequentlyupdated resource results are available from this search. A closed chamber is used to minimise the entry of air. After it has cooled to approximately 200oc, the coke is ejected. Thus, doe is requested to kindly check the complete history of the project development and massenergy balance in the preproject scenario. A funnel is provided with at least one cavity adjacent to the channel passage coke and communicated with the space of the loading door. In that way, dust contents of less than 10gton of coke and coke water contents of less than 3% are reached.
Hot coke out from the coking chamber is received by a circular rotary coke tank on the coke quenching car towed by the electric locomotive. Introduction in recent years, as the environmental problems such as global warming by co2 and air pollution have become more serious, coke dry quenching cdq plant has gathered a lot of attention from the world by its. The coke oven consists of platelike carbonization chambers alternately arranged in a sandwich form to achieve higher thermal efficiency in carbonization. The basic factors that affect the efficiency of dry quenching systems at coke plants are identified by numerical modeling. The coalto coke transformation takes place as follows. The coke dry quenching cdq process has been extensively applied in modern coke oven plants4 for the purposes of energy saving as well as coke quality improvement. It is one of the most renowned energyefficient and environmentallyfriendly facilities within steel production. As a result, the coke is free from surface pore due to aquatic gasification reaction and internal crack that occur in wet quenching.
In this paper, characteristic and kinetics of co 2 reaction with four different kinds of coke such as toploading coke, dry quenching tamping coke, wet quenching tamping coke and semi coke were investigated based on isothermal method. Coke dry quenching machines have onespot design and can either be fixed or rotating bucket. Tata steel has set up indias largest coke dry quenching facility at its stateoftheart greenfield steel plant located at the kalinganagar, odisha. Coke dry quenching blogs, comments and archive news on. The principal benefit in dry quenching is the production of 40o to soo lb. When the car runs to the bottom of the cdq hoisting headframe, the coke tank is hoisted up by the hoister to the top of the headframe and then moved horizontally to the center of cdq furnace. In the traditional cwq coke wet quenching process, the redhot coke which is pushed from the coke oven is cooled by spraying water on the hot coke. Coke dry quenching market research report covers detailed information on global coke dry quenching market size, share. All references cited in this document are available in epa docket a200034. Coke dry quenching cdq coke dry quenching cdq is a heat recovery system to quench red hot coke from a coke oven to a temperature appropriate for transportation. In a coke oven plant, how does one reduce the moisture. Characteristics of pressure drop of charred layer in coke dry.
Wet quenching of coke in the packed towers with cellular packing is not my idea. Coke dry cooling plant coke dry quenching solutions. A thermodynamic analysis first and second laws was performed for a coke dry quenching cdq unit with all data obtained in the site and under the unit normal. Raw material placed in the carbonization chambers is heated to a. Dry quenching coke, hot, quenched, cooling, system, air. Analysis of the construction and operation of coke quenching chambers facilitates the identification of their deficiencies. Coke dry quenching are heat recovery system used particularly in. Water is used as cooling media to cool the hot coke which not only consumes large volume of water but also releases harmful pollutants which is also not permitted buy the government latest regulations. Beat fatigue, drop weight, and heal your body through the new science of optimum hydration hardcover june 12, 2018. As the product quality is improved, cdq may also allow for the use of lowercost noncoking coal in the process, thereby reducing costs 24. On the basis of quantitative estimates, recommendations for increasing the efficiency of coke cooling are made.
However, on discharging cooled coke an equal volume of air enters the system. Coke dry quenching cdq is environmentally and ecologically better than wet quenching. Study on coke dry quenching production and recycling of. In addition, dry quenched coke is harder and stronger, and its moisture content is much lower than that of wet quenched coke. It is an energy saving system in which, during quenching process, sensible heat of the red hot coke is recovered and utilized for power generation or as steam. A comparison of dq coke dry quenched coke with wq coke wet quenched coke for blast furnace operation was made. Compared to the conventional wet quenching, cdq brings about advantages such as the reduction in dust emission and improvement of coke. It is one of the most renowned energyefficient and environmentallyfriendly facilities within. Cdq is a heat recovery system to cool the hot coke from coke ovens. The coke is then fed to the chambers and while it descends through the chamber, is cooled with circulating gas blown from the bottom of the chamber. Model predictive control for improving waste heat recovery in coke dry quenching processes kai sun a, chenting tseng b, david shanhill wong b, shyanshu shieh c, shishang jang b, jialin kang b, weidong hsieh d a department of automation, qilu university of technology, jinan, shandong 250353, china b department of chemical engineering, national tsing hua university, hsinchu 300. In a selfdesigned experimental apparatus, coke oven gas, h2, co, ch4, co2, and n2 as coke dry quenching medium, coke as the bed filler.
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