Section 1 identification section 2 hazards identification. The caustic soda is regenerated in the desorber by expelling acid gas. Jan 17, 2014 the coke oven byproduct plant is an integral part of the byproduct coke making process. Maintenance and cleaning of all fugitive emissions sources associated with the coke oven e. Its secondary function is to recover volatile matter and co coke oven gas from coal and extract chemicals known as coal chemicals. But the impurities it contains make it unsuitable for use as fuel or feedstock.
Cokeoven gas article about cokeoven gas by the free. These highly engineered scrubbers operate on the ejectorventuri principle illustrated. Absorption oil flows into the oil reflux exchanger. The scrubbing liquor for the h2snh3 removal consists of stripped and deacidified water supplied by the distillation plant. It was used for gas lamps, for heating and cooking. Regular packed ammonia scrubber column used for ammonia removal from coke oven gas from 6gm to 100mgcu.
In this case, the cooling water does not come into contact with the coke oven gas and so it can be cooled in a cooling tower for example. Removal of naphthalene and tar from cokeoven gas in primary. Apr 20, 2014 regular packed ammonia scrubber column used for ammonia removal from coke oven gas from 6gm to 100mgcu. This is top distribution header for scrubbing water. The coke oven managers yearbook 224 gas as it is generated, and also to have a reliable continuous supply of flushing liquor to quench this coke oven gas. The coke oven managers yearbook 224 gas as it is generated, and also to have a reliable continuous supply of flushing liquor to quench this coke oven gas to a reasonably low temperature. Co gas produced is used for heating purposes in the plant.
Coke oven clean gas and water project cocgaw in the early 2000s in order to install new technology that would enable them to clean the coke oven gas for reuse in the works as fuel gas more efficiently and also complying with environmental best practice standards internationally. A novel cryogenic separation of hydrogen from coke oven gas is proposed to separate the hydrogen and liquefy it simultaneously, and the cooling capacity is supplied by. Typically, coke oven gas is obtained from a battery comprising a number of narrow, vertical chambers, or ovens 0. To comply with european emission and process regulations for the coke industry, the plant has replaced two open final gas cooling systems, using scrubbers, with alfa laval closed. Installation of collection hoods for coke oven batteries. Coke oven byproduct ammonium sulfate is produced by reacting the ammonia recovered from coke oven offgas with sulfuric acid. This increases the risk of not meeting the requirement on the purity of the coke oven gas. Traditionally a slightly oxygenrich flame is utilized to avoid. This invention relates to the recovery of byproducts from ammoniacharged gas such as coke oven gas, and has for an object a simplification and increased efficiency in such recovery, and more particularly an effective removal of the tar and ammonia and naphthalene and then effecting delivery of the cooled gas, for the benzol scrubbers or other. Availability, properties, purification, and utilization in china find, read and. Coke oven gas processing equipment zvu engineering. Sulphuric acid production from coke oven gas current emissioin and consumption levels 2 umweltbundesamt vienna, 2017 the caesium doped layer the temperature is between 370 and 380 c. To crush and screen coke to 2580 mm size required by blast furnaces. Heat exchangers between the layers reduce the temperature and the waste heat is used to heat a partial flow before entering the contact tower.
Coke oven gas is an abundant byproduct of coverting coal into coke used in steel production. Coal gas is a flammable gaseous fuel made from coal and supplied to the user via a piped distribution system. Process heat comes from the combustion of gases between the coke chambers. To reduce costs, improve yields and treat gas in an environmentally responsible way, alfa laval provides highly efficient solutions for refining from primary gas. The advent of electric lighting forced utilities to search for other markets for manufactured gas. The invention relates to a method for cleaning coke oven gas by washing the gas, whereby a washing liquid is guided into a washing liquid circuit and impurities in said washing liquid are expelled in a desorber. Fabric filter applications on coke oven pushing operations. Stripper plant, enriched water from the gas plant scrubbers containing h2s and nh3, are distilled in columns heated with low pressure steam. The composition may also include benzene c 6 h 6, ammonia nh 3, hydrogen sulfide h 2 s and other components design. Coke oven gas cog is highly rated as a valuable byproduct of coal carbonization to produce coke in the steel industry. An electrostatic precipitator is used to remove more tar from coke oven gas. The necessary volume and dimensions of the stores are determined, as well as the number of stores required. Solar offered a gas turbine combined heat and power chp solution. In a process for removing hydrogen sulfide and ammonia from coke oven gas by scrubbing in a scrubber, wherein the hydrogen sulfide is removed with aqueous ammonia while also using gaseous ammonia, the source of both the aqueous and gaseous ammonia being said coke oven gas, and wherein the hydrogen sulfide is subsequently separated by distillation from the aqueous ammonia.
We have recently installed a gas stripping plant to recover h 2 s, hcn and ammonia gas from a coke oven gas scrubbing plant utilising a fixed valvetray design. Blast furnace, coke gas and converter gas for power production. The composition may also include benzene c 6 h 6, ammonia nh 3, hydrogen sulfide h 2 s and other components. Coke oven gas treatment plants, coke oven gas cleaning. After passing through the scrubbers, the coke oven gas flows to a booster house from where it is distributed to various locations in the steel and. The purification of coke oven gas represents a complex multicomponent separation process combined with many parallel reversible chemical reactions. Flushing liquor, formed from the cooling of coke oven gas, and liquor from primary coolers contain tar and are sent to a tar decanter. Optimal operation of the delivery system for the coke. Coke oven gas is the byproduct of the pyrolysis of coal, which is the basic process for coke production for the blast furnace process. It is produced when coal is heated strongly in the absence of air. The stripped liquors are recirculated back to the scrubbing plant where they are refortified and then returned to the strippers. The process also includes the processing of coke oven gas to remove tar, ammonia usually recovered as ammonium sulfate. Dynamic and steady state simulation of coke oven gas. Contact gas services to perform testing before entering the area.
In many parts of the world the population was supplied with purified coke oven gas as town gas. The coke oven gas to be cleaned is fed to the legs of the second cleaning stage, flows through both cleaning stages one after the other and is withdrawn as a purified gas stream 5 from the top of the first cleaning stage. During the production of coke by coal carburization in a coke oven battery a large amount gas is generated due to the vaporization of volatile matter in the coal. Light oil is removed from the coke oven gas and fractionated to recover benzene, toluene, and xylene. Naphthalene is removed in the separator on the final cooler. Dissolution of sediments and deposits in cokeovengas purification. Cokeovengas, deposit, dissolution, purification sediments forming in the technological equipment for cokeovengas purification i. A coke oven battery is a series of 10 to 100 coke ovens operated together. Therefore, a rigorous dynamic twophase model based on the twofilm theory has been developed, which takes into. Cokeoven gas is used as a fuel and as raw material for the synthesis of ammonia. Pdf total site integration for coke oven plant researchgate.
Continuous process for scrubbing out hydrogen sulfide and. Technologies for coke oven gas desulphurisation dmtgroup. These systems comprised a threestage spiral heat exchanger she tower, which would allow the gas to be scrubbed and cooled before the benzene scrubbers. Modern waste water treatment in coke making plants a new way for water recycling. Some facilities may include an onsite tar distillation unit.
Modern waste water treatment in coke making plants a new. Preheating the beds is accomplished by burning a fuel gas, e. Coke oven gas is formed by heating coal to 1100 c without access of air. The cleaning liquid 6 flowing out of the first cleaning stage 3 is supplied to the upper section of the second. In existing power plant we use also bf gas firing in addition to thermal coal, coke oven gas. Town gas is a more general term referring to manufactured gaseous fuels produced for sale to consumers and municipalities coal gas contains a variety of calorific gases including hydrogen, carbon. The coke oven byproduct plant is an integral part of the byproduct coke making process.
Coke oven furnaces coke oven european environment agency. The gas is generated over most of the coking period, the composition and the rate of. Removal of naphthalene and tar from cokeoven gas in. This increases the risk of not meeting the requirement on the purity of the cokeoven gas.
Therefore, a rigorous dynamic twophase model based on the twofilm theory has been. Tar precipitators as the raw coke oven gas is cooled, tar vaporcondenses and forms aerosols which are carried along with the gas flow. A novel cryogenic separation of hydrogen from coke oven gas is proposed to separate the hydrogen and liquefy it simultaneously, and the cooling capacity is supplied by two refrigeration cycles. Stabilizing the pressure in the delivery system for coke. Coke oven battery 5 p rimary coolers warm sump flushing liquor tank flushing liquor heavy residual steam exhauster tar separator final coolers boiler benzol clean gas back to coke ovens battery 5 scrubbers flair ammonia scrubbers clean ga to pta crude benzol plant 4. Availability, properties, purification, and utilization in. Thus releasing the h2s and nh3 as vapours via the vapour condensers to reduce water content and then these vapours are send to the elementary. In the tubular type, the coke oven gas is cooled indirectly by flowing across horizontally mounted tubes through which cooling water is pumped.
Request pdf on nov 1, 20, rauf razzaq and others published coke oven gas. Closed final gas cooling systems save energy and eliminate emissions at coke plant avdeevskiy coke processing works is ukraines leading coke processing plant. Coke oven pushing emissions containing quantities of tars and dust require new approaches to adapt fabric filter collectors. The waste product is captured, treated and used as fuel for the taurus 60 gas turbine, which produces both electricity and useful thermal energy, while also reducing local air pollution. This volatile matter is called coke oven gas, which is collected and cleaned to be used as fuel. This paper deals with the wheelabratortaisei precoat filter systems being used on coke oven pushing operations. Typically, a single ton of coke generates approximately 360 m 3 cog. Cokeoven gas byproduct recovery koppers co delaware. According to the invention, the coke oven gas is washed with caustic soda in a counter flow. In the opera tional rules for coke plants, the upper limit stated for. Performance and problems of claus plant operation on coke.
Fabric filter applications on coke oven pushing operations james e. In a process for removing hydrogen sulfide and ammonia from cokeoven gas by scrubbing in a scrubber, wherein the hydrogen sulfide is removed with aqueous ammonia while also using gaseous ammonia, the source of both the aqueous and gaseous ammonia being said cokeoven gas, and wherein the hydrogen sulfide is subsequently. Recommended measures to prevent and control particulate matter emission s from coke oven plants include2. Fuel gas heatups are used in putting the system onstream and also to reheat the system after extended downtime. Avdeevskiy coke processing works in ukraine was the first plant of its type to invest in closed final gas cooling systems. Each oven holds between 9 to 32 megagrams mg 10 to 35 tons of coal. As the coke oven gas is cooled, water, tar and naphthalene. Fuel comsumption in coke making can be minimize by preheating blending sometimes water is sprayed during coal charging in the coke oven which helps in prevention of clinker formation in the oven controlling the dust nuisance,while charging the coal reducing the cracking of hydrocarbons in the coke oven gas 14. Standard treatment of coke oven gas batteries gas cooler etp gas exhauster btxwasche btxdesorp. This includes charging of coal, pushing of coke and drywet quenching of coke, etc. The yield of gas is about 300 cu m per ton of dry charge. Heavy residual separator clean coke oven gas distribution battery heating.
A system for stabilizing the pressure in the delivery system for cokeoven gas using a compressor and a receiver has been developed. Reference plants include crystalline fine solids removal from flash dryer offgas scrubbers, kiln offgas venturi scrubbers, electrolyte mist. Tarwater separation coalwater filter clausplant cog crude tar sulfur flushing liquor tar sludge steam benzene scrubber h 2snh 3 scrubber h 2snh 3desorp. Coke oven gas treatment tar, liquor, ammonia by keith wright. For the theoretical description of this process, traditional equilibrium stage models and efficiency approaches are usually inadequate. Explosion characteristics of coke oven gas theoretical study. The gas is stored under an excess pressure of up to 40 kpa. Coke oven gas is cooled, and byproducts are recovered. The main function of coke ovens is to convert coal into coke which is used as a fuel and reducing agent in the blast furnace. Coal or coke oven gas typically had a calorific value between 10 and 20 megajoules per cubic metre 270 and 540 btucu ft. After formation of the ammonium sulfate solution, manufacturing operations of each process are similar. Process plant technology designs and supplies gas scrubbers for many different applications. One of the impurities of the coke oven gas is sulfur which is extracted using claus process.
Scrubbers, air scrubbers, chemical scrubbers, centrifugal. Dmt was founded in 1990 having its roots dating back to 1864 with the establishment of westfalische berggewerkschaftskasse wbk bochum, followed by a number of different companies in the interim period. As the coke oven gas is cooled, water, tar and naphthalene condense out. Coke oven gas, deposit, dissolution, purification sediments forming in the technological equipment for coke oven gas purification i. The claus process normally is used to recover sulfur from coke oven gas. Most applications are for particulate removal soluble or insoluble in order to meet environmental legislated levels for gas discharge to atmosphere. Coke oven gas cog is a byproduct of the coking process, in which coal is heated in the absence of air to drive off the volatile compounds. Coke oven gas is the most common fuel for underfiring coke ovens. The main constituents are, by volume, about 50% hydrogen, 30% methane and 3% higher hydrocarbons, 7% carbon monoxide, 3. The gas from the top of the rich scrubbers, and still containing an appreciable amount of light oil, is further scrubbed countercurrently with stripped strawoil in the lean scrubbers. The gas mainly consists of hydrogen 5060%, methane 1550% and a small percentage of carbon monoxide, carbon and nitrogen.
This invention relates to the recovery of byproducts from ammoniacharged gas such as coke oven gas, and has for an object a simplification and increased efficiency in such recovery, and more particularly an effective removal of the tar and ammonia and naphthalene and then effecting delivery of the cooled gas, for the benzol scrubbers or other disposition, without subjecting. Coke oven gas renaissance of a fuel in the 19th and the first half of the 20th century coke oven gas was one of the main sources of energy for urban households. Rinl if putting up a 120 mw power plant supplied by ms thermax based on 100% bf gas firing and utilise around 4. Coke manufacturing includes preparing, charging, and heating the coal. A typical coke manufacturing process is shown schematically in figure 12. The 010 mm fraction is used in sinter making and 1025. H2s is scrubbed from the coke oven gas by a nh3 solution. Dissolution of sediments and deposits in cokeovengas.