VA 23 09 11-2010 INSTRUMENTATION AND CONTROL FOR BOILER PLANT.pdf

1、11-10 23 09 11 - 1 SECTION 23 09 11 INSTRUMENTATION AND CONTROL FOR BOILER PLANT SPEC WRITER NOTES: 1. Delete between /-/ if not applicable to project and delete any other item or paragraph not applicable in the section and renumber the paragraphs. 2. References to pressure in this section are gage

2、pressure unless otherwise noted. 3. Specification requirements are based on single burner boilers that operate on natural gas and/or fuel oil. PART 1 GENERAL: 1.1 DESCRIPTION: Automatic controls, instruments, monitoring and data management systems and accessories for the boilers, burners and other b

3、oiler plant mechanical equipment. The specification classifies the systems into automatic boiler and burner control systems, burner management systems (flame safeguard), and data management and instrumentation systems. 1.2 RELATED WORK: A. Section 23 05 11, COMMON WORK RESULTS FOR HVAC and STEAM GEN

4、ERATIONB. Section 23 05 51, NOISE and VIBRATION CONTROL FOR BOILER PLANT. B. Section 23 21 11, BOILER PLANT PIPING SYSTEMS: Piping for controls and instrumentation panel. C. Section 23 52 39, FIRE-TUBE BOILERS: Feedwater controls and instrumentation furnished with fire tube boilers. D. Section 23 52

5、 33, WATER-TUBE BOILERS: Instrumentation furnished with water tube boilers. E. Section 23 50 11, BOILER PLANT MECHANICAL EQUIPMENT: Air compressors and accessories for pneumatic control. F. Section 23 50 11, BOILER PLANT MECHANICAL EQUIPMENT Automatic controls for water level in the feedwater deaera

6、tor storage tank and the condensate storage tank. G. Section 23 10 00, FACILITY FUEL SYSTEMS: Tank level monitors and leak detection systems for oil tanks and underground oil piping systems (diesel fuel, burner fuel). H. Section 23 08 11, DEMONSTRATIONS and TESTS FOR BOILER PLANT. I. Section 26 29 1

7、1, LOW-VOLTAGE MOTOR STARTERS. J. Section 23 08 00, COMMISSIONING OF HVAC SYSTEMS. Requirements for commissioning, systems readiness checklists, and training Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-11-10 23 09 11 - 2 1.3 QUALITY ASSURANCE: A.

8、 The boiler and burner control, monitoring, data gathering, instrumentation and associated systems specified in this section shall be provided by one company that has been in business at least three years engineering, designing and servicing industrial and institutional boiler control and instrument

9、ation systems similar to those specified herein, as a primary business. That company shall furnish all components and provide complete calibration, programming, start-up, testing, demonstrations, instructions and training services. B. Submit documented evidence, including start-up and acceptance tes

10、t data, and references, that the company has performed satisfactory work on at least six systems similar to those specified. For instance, submit experience information on systems involving parallel positioning combustion control and on variable speed forced draft fan drives, if these systems are sp

11、ecified. C. If new burners are part of the contract, the burner manufacturer shall be responsible for the burner management system (flame safeguard), including interlocks, all accessories and for coordination with other control and monitoring systems. D. Equipment Experience Requirements: Refer to S

12、ection 23 05 11, COMMON WORK RESULTS FOR HVAC and STEAM GENERATION. E. Code Approval: 1. All burner management and combustion control systems and devices shall comply with NFPA 85. Locations and arrangements of safety devices on fuel trains shall comply with diagrams included in “Annex A” in the cod

13、e. 2. All burner management controls and interlock devices shall be UL listed and FM approved. All controllers that include burner management functions shall be UL listed and FM approved. 3. Parallel positioning combustion control systems shall comply with UL 1998. 4. Computer-based electronic equip

14、ment shall conform to the requirements of FCC Part 15, Subpart J, for Class A computing devices governing radio frequency electromagnetic interference (EMI) while continuing to operate normally. 5. All electrical wiring shall be in accordance with NFPA 70. F. Personnel: All work shall be done by pro

15、perly trained, skilled technicians who are regularly employed and qualified in the Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-11-10 23 09 11 - 3 installation, programming, start-up, calibration, and testing of the systems provided, and who will

16、be directed by experienced engineers employed by the equipment supplier. Personnel must have three years minimum experience with industrial and institutional boiler plant controls and instruments similar to those being furnished for this project. 1.4 SUBMITTALS: A. Submit in accordance with Section

17、01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES. B. Certificates of compliance with Article, QUALITY ASSURANCE (Articles 1.3.A, B, D refer to paragraph below. b. Provide separate dedicated controllers for each boiler and for the master steam pressure control. Fuel/air control loops, including flu

18、e gas recirculation (FGR) and oxygen trim may be incorporated into one station for each boiler. Boiler/economizer outlet draft and boiler water level control shall have separate stations for each item on each boiler. /All control items for one boiler may be shown on one touchscreen./ SPEC WRITER NOT

19、E: The requirement for VFDs is the option of the VAMC based on cost effectiveness. c. Variable frequency drives on forced draft fan motors. 5. Refer to the paragraphs which follow for complete detailed requirements. 6. Refer to Par. 2.2 for burner management controls. SPEC WRITER NOTES: 1. The contr

20、ollers specified are non-proprietary. These controllers, when they become obsolete, often can be replaced by those of another manufacturer and can be serviced by any properly trained controls technician. 2. The system specified is a separate control “platform” from the burner management system. This

21、 simplifies the control arrangement, servicing, and testing. B. Controllers: Multiple-loop programmable microprocessor or programmable logic (PLC) proportional-integral-differential (PID) solid state electronic controllers shall control all functions except burner management. 1. Accuracy: 0.1% analo

22、g inputs and outputs. 2. Resolution: 16 bit input and output. 3. Environment: 0 to 50 degrees C, 15% to 95% RH, non-condensing. 4. As a minimum, each controller shall have capability for four analog and four digital inputs, two analog and four digital outputs, and two PID loops. Provided by IHSNot f

23、or ResaleNo reproduction or networking permitted without license from IHS-,-,-11-10 23 09 11 - 8 5. Memory retention for twelve months minimum for power failure or for storage as spare parts. 6. Membrane push buttons with tactile feedback. 7. Displays shall be a combination of English language, colo

24、r graphics, and digital with 0.5 percent resolution, visible from wide angle. 8. Bumpless manual/automatic transfer. 9. High and low alarms for all inputs. 10. Programming: Controllers shall have capability for quick (5 - 10 minutes) reloading of memory by operating personnel upon memory loss. Provi

25、de all software and hardware necessary to allow field downloading of configuration memory to the microprocessors. 11. Password Protection: Provide levels of password protection for all safety related options and parameters including all commissioning programming. Provide all passwords to Resident En

26、gineer (RE). 12. In the event of a controller fault, the controller shall have a dedicated relay output that results in the shut down of the boiler and provides an alarm to a panel-mounted light and audible alarm. Failure of control system for one boiler shall not affect automatic and manual operati

27、on of other boilers. 13. Controllers and software that operate variable frequency drives shall be manufactured and tested in accordance with UL 508. 14. Controllers shall provide serial RS232/RS485 Modbus communication with computer workstation running latest Microsoft Windows based operating system

28、. This includes data gathering and processing, report generation, monitoring, annunciation and control. / Refer to Paragraph, COMPUTER WORK STATION AND PROGRAMMING. / It shall be possible to defeat the remote control from the front panel of each individual controller, preventing any status changes f

29、rom being initiated at the computer workstation. 15. All controllers, including those assigned to data processing, shall be same model and series. 16. Controllers shall be the current generation product that will be supported by the manufacturer, with parts and service, for a minimum of ten years fr

30、om time of installation. 17. All controllers shall be mounted within specified control panels. 18. Examples of acceptable controllers: Hays-Cleveland “AC Station”, MicroMod “Mod 30 ML”, Moore 323, Preferred “PCC III”, Toshiba “LC500”. Provided by IHSNot for ResaleNo reproduction or networking permit

31、ted without license from IHS-,-,-11-10 23 09 11 - 9 C. Power Supplies: Provide separate uninterrupted power supply for each boiler controller. Any signal that is common to all boilers, such as plant master control signals, shall be isolated from all other boilers so that failure in one boiler circui

32、t will not affect other boilers. SPEC WRITER NOTE: Include the following paragraph if touch screen operator interface is required. D. Touch Screen Operator Terminals: 1. Provide one touch screen control station and display for each boiler mounted on the boiler control panel. Touch screen shall be in

33、 complete communication with all controllers associated with the boiler and with the burner management system. Provide alternate control station to replace touch screen control functions if touch screen fails. 2. Control Station and Display Requirements: a. Local operation and programming of control

34、lers, graphic display of information, alarm message display, historical and real time trending, remote controller tuning, x/y plots of fuel air curve data for intuitive commissioning of controllers, Ethernet connectivity and standard Internet browser remote communication. Network to boiler control a

35、nd burner management systems. b. Selection of automatic or manual control of firing rate. Local manual control to increase and decrease the firing rate. c. Indicate burner management control status and diagnostics in English messages: control on, pre-purge, trial for ignition, igniter flame signal,

36、main flame signal, post purge, burner off, all diagnostic information available from burner management system, continuous indication of flame signal. d. Real time display of all connected process parameters including control output, set point, process variable, all data gathering and processing from

37、 all controllers associated with the boiler. e. Display of all control system alarm messages and faults. History of alarms and faults and recommendations for troubleshooting. f. Complete display and facilities to allow programming all controllers associated with the boiler or the master control. Bur

38、ner management is excluded from this requirement. g. Provide alternate means of automatic and manual operation of boiler firing rates and burner management status if touch-screen fails. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-11-10 23 09 11 -

39、 10 h. Provide continuous display of critical operating parameters, including but not limited to the following: 1) Steam Pressure 2) Water Level 3) Draft Pressure 4) Firing Rate 3. Touch Screen System Hardware and Software: a. 265 mm (10.4 inch) panel-mounted display, TFT with 256 colors, 640 x 480

40、pixel LCD resolution. Locate to allow easy viewing and access from operating floor. b. Aluminum case allowing entire enclosure to be rated NEMA 4x. c. Communication with SCADA program on computer work station. d. Multiple RS-485 Modbus communication interfaces. e. Field-replaceable backlight, real-t

41、ime clock, battery-backed clock time stamps critical data, 8 MB on-board flash application memory, 512 MB memory card, application expanded memory card for historical, alarm and event storage, resistive analog touch screen with free formable to fit target shape. f. Operation interaction shall be tou

42、ch-based allowing easy selection of screens, manual/automatic status changes, start/stop functions, set point changes, output changes and PID tuning parameters without any special programming skills. Screen selection shall also be available through tactile feedback function keys. g. Show facsimiles

43、of each controller and clearly labeled English language and engineering unit display of the control parameters. h. Graphic X/Y curve data plotting capability. When used in conjunction with fuel/air ratio control, provide automated fuel/air ratio curve and oxygen trim setpoint curve adjustment for ra

44、pid, error free burner tune-up. Only a single operator action shall be required to store commissioning data into multiple characterizer curves for a particular load point. i. Configuration software Microsoft Windows based. Provide all necessary software to allow field modification or expansion of th

45、e system including graphics drawing programs and data base builders. Systems based on “run time only” programs are not acceptable. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-11-10 23 09 11 - 11 E. Drive Units and Actuators for Dampers, Fuel Flow

46、 Control Valves, Feedwater Flow Control Valves: 1. Electric drive units are required. 2. Electric drive units shall have continuous modulating duty cycle without any duty cycle or thermal motor limitations. Shall start instantaneously at full rated torque, stop instantaneously without coast or overs

47、hoot. Shall smoothly operate all connected devices without overload. Provide 100 percent duty cycle maintenance free motors that never overheat or burnout under stalled conditions. Gearing shall eliminate backlash. Movement shall be constant speed and shall be coordinated with the controlled process

48、 so that performance parameters remain within specified limits. 3. Additional Requirements for Electric Drive Units on Parallel-Positioning Combustion Control Systems: a. Drive units shall have precise positioning and repeatability to provide air-fuel positioning ratios with a maximum hysteresis of

49、2%. b. Provide continuous precise feedback signals from drive units to controllers. c. Provide auxiliary contacts to prove low and high fire positions, feedback signals are not permitted to perform this function within the VA. Belt-type drive units not permitted. d. Drive unit shafts shall be keyed to fuel flow control valves and damper shafts to eliminate the possibility of slipping. e. Drive units shall b