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1、BRITISH STANDARD BS 799-4: 1991 Oil burning equipment Part 4: Specification for atomizing burners (other than monobloc type) together with associated equipment for single burner and multi burner installations Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:48
2、:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 799-4:1991 This British Standard, having been prepared under the direction of the Refrigeration, Heating and Air Conditioning Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 31 January 199
3、2 BSI 03-1999 First published as Part 1, May 1938 Second edition, February 1953 Third edition, November 1962 Fourth edition as Part 4, December 1972 Fifth edition January 1992 The following BSI references relate to the work on this standard: Committee reference RHE/13 Draft for comment 91/72756 DC I
4、SBN 0 580 19983 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Refrigeration, Heating and Air Conditioning Standards Policy Committee (RHE/-) to Technical Committee RHE/13, upon which the following bodies were represented: Agricultura
5、l Engineers Association Associated Offices Technical Committee British Combustion Equipment Manufacturers Association Building Services Research and Information Association Chartered Institution of Building Services Engineers Department of the Environment (Building Research Establishment) Department
6、 of the Environment (Property Services Agency) Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association Institute of Domestic Heating and Environmental Engineers Institute of Energy Institution of Fire Engineers Loss Prevention Council Power Generation C
7、ontractors Association (BEAMA Ltd.) Coopted members Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:48:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 799-4:1991 BSI 03-1999i Contents Page Committees r
8、esponsibleInside front cover Forewordii 1Scope1 2Definitions1 3Burner operating sequences4 4Types of oil burner control4 5Purging, ignition and flame failure9 6Materials and components11 7Painting and identification15 8Electrical equipment15 9Operating instructions16 10Marking16 Appendix A Recommend
9、ations for safety of plant to which oil burners are fitted17 Appendix B Classification of atomizing oil burners17 Appendix C Recommendations on the maximum degree of filtration for different classes of fuel18 Table 1 Burner operating sequence5 Table 2 Maintenance of single non-mechanical filters: mi
10、nimum intervals between cleaning13 Table 3 Minimum storage and outflow temperatures for classes C, D, E, F, G and H oil fuels and ALF15 Table 4 Recommended maximum degree of filtration for classes C, D, E, F and G oil fuel18 Table 5 Recommended maximum degree of filtration for ALF and class H oil fu
11、el18 Publication(s) referred to 20 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:48:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 799-4:1991 ii BSI 03-1999 Foreword This Part of BS 799 has been prepared under the direction of the Refrigeration, Heating a
12、nd Air Conditioning Standards Policy Committee. It is a revision of BS 799-4:1972 which is withdrawn. This Part of BS 799 is one of a series of standards on oil burning equipment and deals with atomizing oil burners and associated equipment that are not pre-assembled and therefore not identifiable a
13、s being of the monobloc type. It also covers atomizing oil burning systems not of the monobloc type which were covered by BS 799-3:1981. When information is required relating to the installation or operation of the types of oil burning systems covered by this Part of BS 799, reference should be made
14、 to BS 5410-2 and BS 5410-3 as appropriate. In addition, attention is drawn to BS 4256-2. Attention is also drawn to the current work on the subject of oil burning equipment by Technical Committee 47 of the European Committee for Standardization (CEN/TC 47). BS 799-7 and BS 799-8 are identical to Eu
15、ropean Standards produced by CEN/TC 47 and as further specifications are published, the equivalent Parts of BS 799 will be withdrawn. Appendix A of this Part of BS 799 gives recommendations for safety of plant to which oil burners are fitted. Product certification. Users of this British Standard are
16、 advised to consider the desirability of third party certification of product conformity with this British Standard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality systems against the appropriate Part of BS 5750. Enquiries as to the availabil
17、ity of third party certification schemes will be forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exist, users should consider approaching an appropriate body from the list of Association members. A British Standard does not purport
18、to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover
19、, pages i and ii, pages 1 to 20, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Ban
20、k University, Fri Dec 08 11:48:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 799-4:1991 BSI 03-19991 1 Scope This Part of BS 799 specifies oil burning installations for land and marine purposes. The installations may comprise single or multiple arrangement of atomizing type burners and associated
21、 equipment that is not assembled on the same frame or in the same housing. The installations are for use with liquid fuels as specified in BS 2869 or Alternative Liquid Fuels (ALF) having essentially similar characteristics. Reference to oil burners, oil heaters, etc. implies use with either liquid
22、fuel. This standard does not apply to gas turbines and internal combustion engines. NOTE 1Where the oil burning installation is part of a plant that is required to be certified under the Health and Safety at Work etc. Act 1974 or any other legislation, reference should be made to such legislation. A
23、ttention should also be given to SI 2169, 1989, The Pressure Systems and the Transportable Gas Containers Regulations 1989, as parts of these are pertinent to certain aspects of large burner installations, especially those with steam oil-preheaters. NOTE 2For burners burning fuel at below 30 kg/h, s
24、ee BS EN 230 with respect to safety times. NOTE 3The titles of the publications referred to in this standard are listed on page 20. 2 Definitions For the purposes of this British Standard the following definitions apply. 2.1 oil petroleum fuel classes C, D, E, F, G and H in accordance with BS 2869,
25、and ALF having essentially similar characteristics NOTEAdvice should be sought when changing from one grade of petroleum oil to another Petroleum fuels and ALF may be found to be incompatible. 2.2 oil burner a means of mixing oil and air in order to promote controlled combustion. This normally consi
26、sts of a device for delivering the oil in a controlled manner, and a method of introducing combustion air, arranged so that the desired mixing rate is achieved 2.3 atomizing oil burner liquid fuel burners in which ignition of the fuel is preceded by a preparatory phase during which the fuel is divid
27、ed into small droplets to facilitate mixing with combustion air NOTEThe main types of burner in this category are defined in 2.4 and 2.5. 2.4 pressure jet atomizers liquid fuel burners in which oil is supplied, under pressure and at a suitable viscosity, to a nozzle in which some of the pressure is
28、used to impart rotation (swirl) to the oil before it is discharged through the final orifice. On issuing from the final orifice, a film is produced which breaks up into oil droplets NOTEThere are various types of pressure jet atomizers and these are classified in B.2. 2.5 two-fluid atomizers liquid
29、fuel burners in which oil droplets are produced by promoting high rates of shear in the oil by the use of an additional fluid such as air or steam NOTEThere are various types of two-fluid atomizers and these are classified in B.3. 2.6 monobloc type oil burner an assembly of components including at l
30、east the means for the air and the fuel supply and atomization, the flame monitoring, and the adjustment of operation NOTEThe components of the assembly are fixed one to another or assembled on the same frame or in the same housing. These components include at least a fuel pump, an atomizing device,
31、 a combustion air fan, an ignition device, a flame monitoring device and a motor. The assembly is catalogued in this way by the manufacturer. 2.7 regulating device a device which maintains the controlled quantity (for instance, temperature, pressure) at a particular determined value 2.8 flame monito
32、r a device which sends signals to the control device indicating that the flame has failed to be established, is present or has been extinguished NOTEGenerally such a device consists of a sensor (possibly associated with an amplifier) and delivers a signal. 2.9 control device a device which effects s
33、tarting up and switching off of the oil burner in accordance with a pre-set programme in response to signals from the regulating, monitoring or limiting devices NOTE 1A synonymous term for “control device” is “controller”. NOTE 2Some components of the flame monitor may be incorporated into the contr
34、ol device (for instance, an amplifier with a relay). Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:48:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 799-4:1991 2 BSI 03-1999 2.10 limiter a device which senses the controlled quantity, causing the switching
35、 off of the burner. It operates once a predetermined limiting value has been reached 2.11 automatically reset limiter a limiter which resets itself automatically and allows the restarting of the burner only after a predetermined change of the supervised quantity has occured 2.12 manually reset limit
36、er a limiter which requires simple manual intervention for the restarting of the burner 2.13 reset limiter with locking device a limiter which can only be reset by use of specialized tools, by trained personnel, to allow the restarting of the burner 2.14 automatic ignition performed electrically a s
37、ystem in which the ignition necessarily involves the sole use of electrical energy NOTEThe two systems described in 2.15 and 2.16 may be distinguished. 2.15 proven spark ignition a system which admits no fuel flow unless the presence of the spark is proved 2.16 unproven spark ignition a system in wh
38、ich the admission of the fuel is not prevented by the absence of the spark 2.17 automatic ignition provided by liquid or gaseous fuels a system in which the fuel is ignited by a small liquid or gaseous fuel burner known as a pilot burner, and which may be operated continuously or discontinuously NOT
39、EIn the case of discontinuous operation the two systems indicated in 2.18 and 2.19 may be distinguished. 2.18 ignition by proved pilot burner a system which admits no main fuel flow unless the presence of flame on the pilot burner is proved 2.19 ignition by unproved pilot burner a system in which th
40、e admission of the main fuel is not prevented by the absence of a flame on the pilot burner 2.20 operating shut-down a process initiated by a regulating device, by an automatically reset limiter, by a time-switch or manually 2.21 flame fault shut-down a process initiated by the action of the flame m
41、onitor when the flame fails to be ignited or is extinguished, and resulting in a lock-out of the control device under the conditions of clauses 4 and 5 2.22 safety shut-down a lock-out of the control device after a response is received from either a manually reset limiter or a reset limiter with loc
42、king device, e.g. for pressure, temperature, water-level, atomizing medium or combustion air 2.23 lock-out stopping of the control device so that restarting cannot be effected without manual intervention 2.24 re-ignition a process in which the ignition is switched on after extinction of the flame du
43、ring operation, without the oil supply being interrupted 2.25 restart a process in which the starting procedure is repeated after extinction of the flame during operation. When restarting is carried out, the specified control programme sequence is adhered to NOTE 1A synonymous term for “restart” is
44、“repetition”. NOTE 2See also 2.33. 2.26 total ignition time the period during which the ignition device is in operation. Pre-ignition, actual ignition and post-ignition times comprise the total ignition time 2.27 pre-ignition time the period between the starting up of the ignition device and the rel
45、ease of the oil supply Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:48:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 799-4:1991 BSI 03-19993 2.28 actual ignition time the period between the release of the oil supply and the first appearance of the flame
46、 2.29 post-ignition time the period between the first appearance of the flame and the switching off of the ignition device 2.30 safety time the maximum permitted period of time during which the control device allows release of the oil when no flame is present NOTEA distinction is made between the sa
47、fety times, according to whether they are followed by fault shut-downs when starting-up or during operation. 2.31 safety time at ignition the period beginning the instant the signal to release the oil supply is given and finishing with the signal to shut off the oil supply 2.32 safety time during th
48、e state of operation the period beginning at the instant of the disappearance of the flame and finishing with the signal to shut off the oil supply 2.33 waiting time the minimum period between the shutting down of the oil burner after extinction of the flame and restoration of the oil feed which acc
49、ompanies restarting of the burner 2.34 flame simulation a signal indicating that a flame is present whereas in fact no flame is present NOTEFor protection against the simulation of a flame and against stray light (applicable only in the case of flame detection systems relating to a continuous level of illumination) see 3.1. 2.35 purging time the period during which the combustion chamber is forcibly ventilated without the oil supply being released NOTESee also Table 1. 2.36 pre-purging time the period immediately preceding the release of the fuel supply 2.37 post-p
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