1、 STD-BSI BS EN YSSLO-4-8-ENGL 2000 E Lb24bbS 0824470 73b 0 BS EN 45510-4-8:2000 BRITISH STANDARD I Guide for procurement of power station equipment - Part 4-8: Boiler auxiliaries - Dust handling plant The European Standard EN 455104-81999 has the status of a British Standard ICs 27.060.30; 27.100 NO
2、 COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW STD-BSI BS EN 45510-4-8-ENGL 2000 = 1b24bb9 0824471 b72 9 BS EN 455104-8:2000 Amd. No. Date This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of t
3、he Standards Cornmittee and comes into effect on 15 January 2000 Comments O BSI 01-2000 ISBN O 580 35356 7 National foreword This British Standasd is the English language version of EN 4551-4431999. The UK participation in its preparation was entrusted to Technical Committee E/-/20, Power engineerin
4、g steering committee, which has the responsibility to: - aid enquirem to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate intapretation, or proposals for change, and keep the UK interest
5、s informed them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under t
6、he section entitled “International Standards Correspondence Index“, or by using the “Find faciliw of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contra those are differentiated by the velocity of conveyance. Dilute phase co
7、nveying systems also known as high-velocity conveying systems include: - ejectors; - dust pumps; - elevators (airiift). Dense phase conveying systems, using pressure vessel conveyors as transmitters include: - plug conveyors (batch conveyors); - turbulent flow conveyors. Mechanical conveyors systems
8、 for dust handling include: - belt conveyors (moistened dust); - drag link conveyors; - bucket elevators; - silo vehicles. Hydraulic conveying systems use pressurized water as conveying medium in pipelines; These include: - slurry pumps: - ejectors. A multitude of accessories can be necessary to for
9、m a complete dust removal plant. If fly ash is to be utilized it mostly is to be kept in dry condition. In consequence the dust handling systems for this purpose are limited to pneumatic and mechanical devices or a combination of both. Hydraulic conveyance of fly ash is preferably employed in combin
10、ation with hydraulic ash handling if all combustion residues are to be dumped as waste. The equipment covered by this Guide is defined by its function rather than design type. Therefore, the guidance to the specification is stated in performance terms rather than being specified by a detailed descri
11、ption of the equipment to be supplied. This Guide indicates to potential purchasers how their specification should be prepared so that: - the equipment type and capacity interfaces correctly with other elements of the systems such as the - predicted performance is achieved; - ancillary equipment is
12、properly sized; - reliability, availability and safety requirements are achieved; - proper consideration is given to the evaluation process and the quality measures to be applied. boiler and gas treatment plant; OBSI 01-2000 STD-BSI BS EN 45510-4-8-ENGL 2000 II 1624669 0824478 “27 I Page 7 EN 4551 0
13、-4-8:1999 This Guide does not determine the type of specification (e.g. detailed, performance, functional) or the extent of supply for any given contract which is normally decided on the basis of the purchasers project strategy. It does not cover: - any commercial, contractual or legal issues which
14、are normally in separate pars of an enquiry; - any allocation of responsibilities which are determined by the contract. This Guide does not prescribe the arrangement of the documents in the enquiry. NOTE: As a comprehensive European environmental policy is still under preparation, this Guide does no
15、t address the environmental implications of the equipment. 2 Nonnative references This Guide for procurement incorporates by dated or undated reference, provisions from other publications. These normative references are cited in the appropriate places in the text and the publications are listed here
16、after. For dated references, subsequent amendments to or revisions of any of these publications apply to this Guide only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN IS0 9001 EN IS0 9002 IEC 60050-7 97 Quality
17、 systems - Model for quality assurance in design, development, production, installation and servicing (IS0 9001:7994). Quality systems - Model for quality assurance in production, installation and servicing (IS0 9002:7994). lnternational elecfrotechnical vocabulay - Chapter 797: Dependability and qu
18、ality of service. 3 Definitions For the purposes of this Guide, the following definitions apply: 3. i Organizational terms 3. i. 1 purchaser: Recipient of a product and/or a service provided by a supplier. 3.1.2 supplier: Person or organization that provides a product and/or a service to the purchas
19、er. 3.1.3 specification: Document stating technical requirements of the purchaser. It may form part of an enquiry issued by a purchaser. 3.1.4 enquiry: Invitation to tender issued by a purchaser. It will normally include a specification together with the necessary contractual and commercial conditio
20、ns. 3.1.5 tender: Offer made by a tenderer in response to an enquiry. 3.6 tenderer: Person or organization submitting a tender for the equipment in response to the enquiry. 3.1.7 site: Place to which the equipment is to be delivered or where work is to be done by the supplier, together with so much
21、of the area surrounding as the supplier may, with the consent of the purchaser, use for the purposes of the contract. NOTE: Further definitions of useful organizational terms may be found in ENIS08402 (see Bibliograph y). 3.2 Technical terms 3.2.7 Operating conditions 3.2.1.1 dust handling plant: Eq
22、uipment comprising devices for extraction, conveying, intermediate storage, treatment and loading for delivery by means of pneumatic, mechanical or hydraulic systems which together form a system to remove combustion residues entrained in the Ruegas asfly ash for utilization or dumping. OBSI 01-2000
23、STDmBSI BS EN 45510-4-8-ENGL 2000 lb24669 0824479 9b3 M Page 8 EN 4551 0-4-8:1999 3.2.1.2 and some unburnt combustibles. 3.2.1.3 stabilized with some fly ash. This product is normally transported in its dry state or with predried transport air. 3.2.1.4 operated for a period not exceeding the specifi
24、ed design life. fly ash: Dust burden entrained in the flue gas flow leaving the furnace consisting of mineral matter stabilized product: Reaction by-product of spray dry, semi spray dry or absorption FGD process, continuous maximum operating condition: Maximum condition at which the equipment may be
25、 3.2.2 Pneumatic conveying 3.2.2.1 air slide: Device for air activated gravity conveying, consisting of a closed chute with a slight slope, split into a lower and an upper section separated by a porous membrane. Supply of air into the lower section causes the dust in the upper section to be fluidize
26、d and flow in the direction of the slope. 3.2.2.2 ejector: Device for pneumatic conveyance of dust. Comprising an inlet housing for accepting dust, a pressure nozzle and a diffuser connected to a pipeline. 3.2.2.3 dust pump: A pneumatic pump in which dust enters the mixing head through a high-speed
27、screw. Further conveyance by compressed air via a pipeline. 3.2.2.4 airlift: Vertical transport of dust. Dust is stored in a container at the bottom and fluidized before conveyance by compressed air via a pipeline. 3.2.2.5 pressure vessel conveying: The dust is admitted intermittently into a vessel
28、isolated from the conveying pipeline. After filling the vessel is pressurized and then discharged into the pipeline. 3.2.2.6 plug and turbulence conveying: Further developments of pressure vessel conveying, with additional air injection into the pipeline system. 3.2.3 Mechanical conveying 3.2.3.1 du
29、st hopper: Dust collecting chamber arranged below DeNQ reactor, air preheater, open pass and precipitator or filter from which the dust can be discharged under gravity into the conveying system. 3.2.3.2 belt conveyor: An endless rubber belt supported by idlers mounted on a structure in trough shape
30、and stretched between a head drive pulley and a tail pulley. Fly ash should be moistened and the beit conveyor be covered for weather protection. A further development is an endless rubber belt constrained to form a tube by annular arrangement of the idlers. 3.2.3.3 drag link conveyor: One or two pa
31、rallel endless chains with a series of scraper flights sliding in a dust tight casing. A further development uses a series of discs on an endless chain enclosed in a tube. 3.2.3.4 bucket elevator: An endless belt or pair of chains carrying a series of discrete buckets for vertical transport which on
32、 turning over at the top pulley discharge their contents. Particularly suitable for large elevations. Enclosed in a dust tight casing. 3.2.3.5 silo vehicle: mobile equipment with special facilities for ease of transport and discharge of dust. 3.2.4 Hydraulic conveying 3.2.4.1 slurry pump: Single-sta
33、ge wear-resistant centrifugal pump for transportation of dusthater mixture through pipelines. 3.2.4.2 ejector: Device to propel dust by a pressurized water jet into a pipe. The ejector consists of an inlet housing, a nozzle fed with water and a diffuser. Simple design permits easy replacement of com
34、ponents which may wear. 3.2.5 Accessories 3.2.5.1 hopper shut-off devices: Tightly closing devices below dust hopper to prevent air in-leakage when conveying device is not in operation and to allow access for repair of downstream equipment. Flatbody gate and rotary disc valves are commonly used. OBS
35、I 01-2000 STD.BSI BS EN 45510-4-8-ENGL 2000 1624bb9 0824480 b85 D Page 9 EN 4551 0-4-811 999 3.2.5.2 hopper discharging devices: Equipment which controls discharge rate and prevents air in-leakage when conveying device is in operation. Weight loaded or actuated valves, rotary feeders or screw convey
36、ors are commonly used. 3.2.5.3 dry loading: Long distance transport of fly ash in dry condition is performed by silo vehicles which are filled by gravity flow via double bellows adjustable in outlet height and provided with a connection cone. Displaced air from the silo vehicle is fed to a suction u
37、nit via the free space of the double bellows. 3.2.5.4 wet loading: For transport in open vehicles or by belt conveyors fly ash must be moistened in order to prevent dust nuisance; Moistening can be performed either by moistening screw devices, plough blade mixers or peletizing disks. 3.2.5.5 fluidiz
38、ation aids: Devices to promote the flow of dust from hoppers and silos. 3.3 General terms 3.3. I enquiry. 3.3.2 3.3.3 3.3.4 equipment is in operation and/or does not restrict operational requirements of the power station. 3.3.5 planned maintenance but without replacement of a significant component 3
39、.3.6 3.3.7 equipment. 3.3.8 specification. These are separate to those normally included by the supplier for his own purposes. 3.3.9 operated for a suficient time to have demonstrated performance and availability. 3.3.10 3.3.11 3.3.12 equipment: Plant, component, system and/or associated service to
40、be provided in response to the conformity: Fulfilment of specified requirements by a product, process or service. performance: Obligations verified by specified tests. operating period: Time between planned outages or maintenance periods during which the life expectancy: Time period over which the e
41、quipment might be expected to operate with design life: Operating hours of the equipment on which design calculations are based. acceptability: Compliance with criteria defined by the purchaser for assessing the suitability of equipment margins: Allowance for design, fabrication or operating conting
42、ency defined in the proven equipment: Equipment which may be demonsfrated to be similar to that offered and has availability: As defined in IEC 60050-197. reliability: As defined in IEC 60050-797. maintainability: As defined in IEC 60050- 19 1. 4 Brief overall project description 4.1 The enquiry sho
43、uld define the purchasers role in the project, including whether the purchaser will assume responsibility for the planning and technical coordination of the project, or whether other organizations will be appointed to carry out all or pari of this function. The enquiry should define all organization
44、al interfaces and the procedures to be employed for managing the contract and the site. Role and organization of purchaser 4.2 Site location The specification should describe the geographical location of the site which may include surveying points, the previous use of the site and any local features
45、 such as impact of industrial or military activities and planning restrictions. Where applicable, the specification should indicate site datum on specification drawings and specify site and drawing orientation and define coordinate axes (x, y, z) and numbering order to ensure consistency between sup
46、pliers of connected equipment. OBSI 01-2000 STDmBSI BS EN 45530-4-8-ENGL 2000 m Lb24bb9 0824483 533 Page 10 EN 4551 0-4-811 999 Where appropriate, the specification should define the permitted ground loading, dimensional and time restrictions on access routes up to but not including public roads or
47、railways. The specification should identiv, where appropriate, the environment of the site in which the equipment will operate. The following factors may normally be included if appropriate: - climatic e.g. atmospheric pressure, annual variation of air and cooling water temperature, relative humidit
48、y, rain fall, icing, snow, wind velocity (normal and maximum), lightning; - geological e. g. seismic conditions and characteristics of subsoil (e.g. caverns, gliding stratifications, load bearing capability of subsoils); - geographic e.g. elevation, influence of local topography and structures; - hy
49、drological e.g. flooding and tides. 4.3 Equipment task The specification should describe in general terms the function, task or role of the equipment to be purchased, e.g. whether it is part of a new power generating plant, a modification to an existing power generating plant, or replacement equipment. The specification should state the type of furnace from which the fly ash originates and which installations are to be served by the dust handling plant. If there is an end use for the fly ash the requirements of the user should be stated in the specification. Further detail
