These standard dryout schedules are generic and require temperature monitoring rarely found at power plants, where. Melindungi dinding boiler dari serangan langsung oleh api pembakaran sehingga dinding luar boiler aman bagi manusia. Boiler refractory dry out is to ensure proper drying, curing of refractory applied on furnace and other components. Valmet cfb boiler formerly cymic is an advanced circulating fluidized bed cfb boiler developed by valmet. The cfb boiler has long been viewed and accepted in the industry as viable technology in the 20 350 mwe sub critical class units. As a consequence of changing power generation technologies, refractory technologies have also had to change to keep up. Cfb boiler refractory material rongsheng refractory. Its important to understand that all boiler systems require expert operator attention during startup. High alumina bricks and clay bricks used in cfb boiler have good high temperature volume stability, good abrasion resistance, good molten slag erosion resistance, etc. Hence, solid particle erosion at elevated temperatures is desired in selecting the suitable refractory quality for boiler applications. A refractory failure is the number one cause of boiler inefficiency and a major contributor to boiler shutdowns. Boiler refractory startup plays a huge role in determining the achievable refractory life. Erosion failure analysis of cfbc boiler international journal of. The bulk density is useful property of refractories, which is the amount of refractory material within a volume kgm3.
Refractory services refractory services for circulating fluidized bed burning coal, waste coal, and biomass. Unfortunately, standard refractory dryout schedules, provided by all refractory manufacturers with their. Different versions industrial boilers ore developing with gradual change in their design of different parts and to optimize the thermal efficiency, fuel multiplicity and to sustain with environmental norms, with cost effectiveness for installation operation and. The correct blow in method and process is the key to cfb boiler service life. When cleaverbrooks or any other boiler manufacturer build a boiler, the pressure vessel must be built in accordance with asme\. Pdf design and operation of cfb boilers with low bed inventory. Any sign of damage or drops in performance may indicate that a refractory repair is in order. Information was obtained from the boiler vendors, refractory suppliers and installers, and the ownersoperators of over forty units. Refractory services for circulating fluidized bed coal. Cfb system once comparing it to the expenditure for standard linings out of refractory castables. Easy access is a necessity for those with heavy refractory, since they need frequent and expert maintenance. Msw consumer pdf mixed plastics consumer pdf wood and plastics polyolefin.
Cfb presentation free download as powerpoint presentation. Internal recirculation circulating fluidizedbed boilers. This characteristic allows the oxy cfb boiler to be made smaller and less expensive in a new unit application. Recognize maintenance and repair procedures for boiler refractories. Brimstone sts limited september 16, 2011 page 2 of 15 this paper is intended to present general information to help industry operation personnel better. Furnaces are built with highgrade, fireresistant materials that take a lot of punishment. Valmet cfb boiler utilizes circulating fluidized bed. Integrated cyclones have a lighter refractory and are faster to start up compared with cfb boilers equipped with traditional cyclones.
Erosion can be mitigated by the use of refractory lining. Care and maintenance of circulating fluidized bed boilers refractory failure. For pcc and cfbc boilers, oxyfuel combustion systems that produce high. Various refractories are required for industrial boilers depending on the specific part they are lining and the type of boiler employed such as package boilers, cyclone boilers, wastetoenergy units, cfb s, ash hoppers and. However, refractory lined surfaces are not useful for heat transfer. Boiler refractories for power generation applications. This is especially true when alternative fuels are being used.
The erosion resistance of dense refractory bricks or castables used in cfbc boilers is tested as per astm c 704. Fluidizedbed ircfb boiler which is the technology of choice for power plant. Calderys has been delivering results to circulating fluidised bed cfb boiler operators for decades, with projects all over the world for both cooled and uncooled technologies including the nordic countries, poland, germany, india, and china. Among the numerous maintenance items encountered with the operation of circulating fluidized bed boilers refractory failure may be the most problematic, time consuming, and costly. Developments in circulating fluidised bed combustion. Refractory castable refractory bricks cfb refractory. Atmospheric and pressurized fluidised bed boilers design their problems. Issues with your boiler s refractory may include cracking, difficulty with refractory doors, pressure vessel leaks, or damaged seal joints and holes. Refractory experience in circulating fluidized bed. An increase in bulk density of a given refractory increases its volume stability, heat capacity and resistance to slag.
Manufacture refractory castable mouldable bricks mortar binder and other related products that used in cfb boiler, gasifier, coal powder boiler and other mediumlow temperature boilers. Refractory ppt in 150 mw cfbc boiler free download as powerpoint presentation. Drying refractory is critical for strong, longlasting refractory applications. Cfb boiler correct blow in method china refractory brick. Cfb boiler basic design, operation and maintenance 1. High temperature erosion of dense refractory castables for. Based on the comparison of cfb boiler and pc boiler, this paper expatiated on the failure, abrasion mechanism, material capability and selecting material. Cfb boilers fluidised bed boilers gratefired traveling grate boilers rotary kiln incinerators pulverised fuel boilers pf pcf gasi. Special care is needed when it comes to manipulating boiler fuel systems and feed water to ensure safety and prevent system damage. Improve design of tube stage inevitably plant built to a cost, therefore optimisation of stage design and materials employed versus the original. The air system is very important for the cfb boiler, as it consumes the greatest amount of power. Circulating fluidized bed cfb boiler process youtube.
The cfb boiler can also be built with a multiinlet cyclone located inside the furnace. A cfb boiler can make use of these alternative materials with few modifications to the unit. Design of circulating fluidized bed boilers poweredge. Sumitomo shi fw is the global leader in cfb technology and has supplied a full range of cfb boilers totaling 36 gwe in power capacity and 30 million hours of operational experience. Among the numerous maintenance items encountered with the operation of circulating fluidized bed boilers refractory failure may be the most problematic, time. Unfortunately, standard refractory dryout schedules, provided by all refractory manufacturers with their products, are difficult to apply to refractory used on a steamgenerating boiler. The increasing demand for circulating fluidized bed cfb boilers to cofire biomass and waste fuel products creates increased stress on refractory systems. Cyclone capture efficiency is often defined as cutoff size. Localized large weld beads due to manual welding process cause. Pdf the erosion resistance of dense refractory bricks or castables used in cfbc boilers is tested as per astm c 704. Cfb boilers refractory improvements for biomass cofiring the increasing demand for circulating fluidized bed cfb boilers to cofire biomass and waste fuel products creates increased stress on refractory systems resulting in more frequent replacement cycles and increased maintenance costs. Refractory that is properly selected and installed will always last longer, help minimize the amount of shutdowns required, and lead to savings in annual fuel cost.
Sooner or later, however, repairs become necessary. This blow in project refers to electric roasting and traditional coke roasting plus electric roasting method, mainly adopts electric roasting, combined with a little amount of wood roasting or coke roasting. Care and maintenance of circulating fluidized bed boilers. Drying refractory in steamgenerating boilers insulation. Cfb refractory improvements for biomass cofiring power. Wear resistant and refractory nonmetal material of cfb boiler. It combines highefficiency combustion of various solid fuels with low emissions, even when burning fuels with completely different calorific values at the same time. Refractory linings and the use of coal firing have been used for over 100 years but todays systems operate without consideration for the materials in the lining. Key benefits are fuel flexibility, reduced emission and lower bed temperature. The refractory usually undergoes considerable chemical changes, during initial heating.
Refractory lining an overview sciencedirect topics. While heating, there must be free air flow over the system to ensure removal of moisture. This work is in support of does clean coal technology program, which includes circulating fluidizedbed technology as one of the selected concepts being evaluated. Cfb s are an interesting challenge due to the intricate elements that all fit together and change during the operation of the unit. Cfb boiler cyclone separator anchor brick refractory and antiwearing. The code dictates the materials, processes and design of the pressure vessel.
Important considerations for refractory dryouts, startups. Melindungi pipapipa dan bagian lain dari cfb boiler dari abrasi oleh bed material yang bercampur dengan partikel lain seperti. The feedstocks, oxygen, and steam are introduced through burners at the. The main applications parts of high alumina bricks and fireclay bricks are. This section is all about afbc and cfbc boilers circulating fluidised bed combustion operation manuals. The key in restricting cfb circulating fluidized bed boiler running was material selection, construction fixing, pouring, coating, structure designing and running mode of wear resistant and refractory nonmetal material. Basic refractory component with sophisticated design, centrally positioned metallic restraint elements and a highly abrasionresistant special refractory mix to close the joints are the main features of the system. The circulating fluidized bed is playing more and more vital role in the electric power. A typical utility cfb boiler would use three types of fanblowers. Sinopec maoming, china original fuel petcoke replaced by coal, existing secondary air system and fuel feeding arrangement needed improvement new fuel chutes with spoon air and refractory lining new vortex type secondary air nozzles results improved fuel and secondary air.
Failure analysis of refractory anchors of a power boiler. Weld overlay and refractory upgrades replacement parts cyclone burner retrofits. The design of all cfb boiler components and equipment including furnace, cyclones, economizers, superheaters, reheaters, loop seals, expansion joints, refractory, and lvalves will be covered in detail. This seminar will provide a comprehensive understanding of the design of circulating fluidized bed cfb boilers. Care and maintenance of circulating fluidize bed boilers national. Cfb boiler refractory page 2 of 4 dongfang refractory. Tube failure management renew tubes wholesale typically at planned outage on basis of known wastage rate to optimise maintenance strategy for reliability. Fluidized bed boilers for biomass pdf free download. A variety of different materials come into play, given the various properties that can affect the refractory, including abrasion, high temperatures, thermal shock. This method of testing determines the relative erosion of a refractory at room temperature only. These prevent corrosion and erosion and they also prevent outages or cfb.
1011 949 1495 342 976 292 1352 144 1366 796 378 1372 1142 106 850 123 444 881 277 548 1069 748 929 136 1010 926 979 257 1478 1481 697 471 582 349 735 444 1056 1210 29 42 254 313