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1、NFPA 8505 Standard for Stoker Operation 1998 Edition National Fire Protection Association, 1 Batterymarch Park, PO Box 9101, Quincy, MA 02269-9101 An International Codes and Standards Organization Copyright National Fire Protection Association Provided by IHS under license with NFPALicensee=Purdue U
2、niversity/5923082001 Not for Resale, 11/02/2006 09:59:12 MSTNo reproduction or networking permitted without license from IHS -,-,- Copyright National Fire Protection Association, Inc. One Batterymarch Park Quincy, Massachusetts 02269 IMPORTANT NOTICE ABOUT THIS DOCUMENT NFPA codes, standards, recomm
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27、see=Purdue University/5923082001 Not for Resale, 11/02/2006 09:59:12 MSTNo reproduction or networking permitted without license from IHS -,-,- 85051 Copyright 1998 NFPA, All Rights Reserved NFPA 8505 Standard for Stoker Operation 1998 Edition This edition of NFPA 8505, Standard for Stoker Operation,
28、 was prepared by the Technical Committee on Stoker Operations, released by the Technical Correlating Committee on Boiler Combustion System Hazards, and acted on by the National Fire Protection Association, Inc., at its Fall Meeting held November 1719, 1997, in Kansas City, MO. It was issued by the S
29、tandards Council on January 16, 1998, with an effective date of February 6, 1998, and super- sedes all previous editions. This edition of NFPA 8505 was approved as an American National Standard on February 6, 1998. Origin and Development of NFPA 8505 In 1984 the Technical Committee on Boiler-Furnace
30、 Explosions started working on a doc- ument for stoker operations. The first edition of NFPA 85I was issued in 1989. This was devel- oped through numerous task force, subcommittee, and Technical Committee meetings. The document was written to provide user requirements in order to limit the hazards a
31、ssociated with these special systems and to broaden the NFPA 85 series of standards, which dealt with safe boiler operation. The 1989 edition was a partial revision and included a variety of changes. Foremost was the renumbering of the document to NFPA 8505. The 1998 edition is a complete revision o
32、f the document. The document has been revised to change the language to mandatory text and to rename the document as a standard. Addi- tional changes have been made to correlate this standard with the other five NFPA 8500 series standards. Copyright National Fire Protection Association Provided by I
33、HS under license with NFPALicensee=Purdue University/5923082001 Not for Resale, 11/02/2006 09:59:12 MSTNo reproduction or networking permitted without license from IHS -,-,- 85052STOKER OPERATION 1998 Edition Technical Correlating Committee on Boiler Combustion System Hazards Dale E. Dressel, Chair
34、Monsanto Co., MO U Merton W. Bunker, Nonvoting Secretary Natl Fire Protection Assn., MA Courtney D. Alvey, Lutherville, MD SE Johnny W. (Bill) Bass, Forney Corp., TX M James R. Bostick, Bailey Controls Co., OH M Thaddeus Bukowski, Underwriters Laboratories Inc., IL RT Paul L. Cioffi, Babcock however
35、, these are not covered in this standard. When firing gas, oil, or pulverized fuel alone, the NFPA standard that applies to that fuel shall be used. 1-1.2 Requirements for auxiliary fuel-firing equipment and interlocks shall comply with NFPA 8501, Standard for Single Burner Boiler Operation, or NFPA
36、 8502, Standard for the Preven- tion of Furnace Explosions/Implosions in Multiple Burner Boilers. Exception No. 1:The purge requirements of NFPA 8501 or NFPA 8502 shall not be required when the stoker is firing and the boiler is on- line. In those cases, if no cooling air is being provided to the au
37、xiliary burners, a purge of their associated air supply ducts shall be provided. Exception No. 2:When firing oil or gas in a supervised manual sys- tem in accordance with NFPA 8501, the excessive steam pressure inter- lock shall not be required. 1-1.3 This standard is not retroactive. This standard
38、shall apply to new installations and to major alterations or exten- sions that are contracted subsequent to the effective date of this standard. 1-1.4 Since this standard is based on the present state of the art, its application to existing installations is not mandatory. Nevertheless, operating com
39、panies are encouraged to adopt those features of this standard that are considered applicable and reasonable for existing installations. 1-1.5 Revisions to this document reflect the current state of knowledge and do not imply that previous editions were inad- equate. 1-2 Purpose. 1-2.1 The purpose o
40、f this standard shall be to establish mini- mum standards for the design, installation, operation, and maintenance of stoker-fired boilers, their fuel-burning sys- tems, and related control equipment, to contribute to operat- ing safety. 1-2.2 No standard can guarantee the elimination of furnace exp
41、losions and implosions in boilers. Technology in this area is evolving constantly, as reflected in revisions to this standard. The user of this standard needs to recognize the complexity of firing fuel with regard to the type of equipment and the char- acteristics of the fuel. Therefore, the designe
42、r is cautioned that this standard is not a design handbook. This standard shall not eliminate the need for the engineer or for competent engineering judgment. It is intended that a designer capable of applying more complete and rigorous analysis to special or unusual problems is to be given latitude
43、 in the development of such designs. In such cases, the designer shall be responsi- ble for demonstrating the validity of the proposed design. 1-2.3 Emphasis is placed on the importance of adequate strength of the structure, proper operation and maintenance procedures, combustion and draft control e
44、quipment, safety interlocks, alarms, trips, and other related controls that are essential to proper boiler operation. 1-2.4 The effect of gas cleanup systems located downstream of the post-combustion gas passes of the boiler furnace is known to be significant. Coordination of the operating procedure
45、s and design of the boiler furnace system and air quality system air-flue gas path shall be required. Such coordination shall include requirements for ensuring a continuous flow path from the forced draft fan inlet through the stack. This stan- dard provides only the general requirements for these s
46、ystems because of the multiplicity of their designs. Chapter 2 General 2-1 Furnace Explosions. 2-1.1 The basic cause of furnace explosions is the ignition of an accumulated combustible mixture within the confined space of the furnace or the associated boiler passes, ducts, and fans that convey the g
47、ases of combustion to the stack. 2-1.2 A dangerous combustible mixture within the boiler enclosure consists of the accumulation of an excessive quan- tity of combustibles mixed with air in proportions that result in rapid or uncontrolled combustion where an ignition source is supplied. A furnace exp
48、losion can result from ignition of this accumulation if the quantity of combustible mixture and the proportion of air to fuel are such that an explosive force is created within the boiler enclosure. The magnitude and inten- sity of the explosion depends on both the relative quantity of combustibles
49、that have accumulated and the proportion of air that mixes with the combustibles at the moment of ignition. Explosions, including “furnace puffs,” are the result of improper operating procedures by personnel; improper design of equipment or control systems; or malfunction of the equipment or control system, consistency of fuel, or moisture content of fuel. 2-1.3 Numerous conditions can arise in connec