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MINUTES OF MEETING
Technical Committee on Multiple Burner Boilers
January 14-15, 2014 PERA Club Tempe, AZ
I. Attendance: Principal Members/Staff: Mike Walz, Technical Committee Chair, Burns & McDonnell Engineering Co., MO Denise Beach, NFPA, MA Frank Bennett, GenOn Energy, Inc., MD John Bollinger, Babcock & Wilcox Company, OH Dale Dressel, Solutia Incorporated, MO John Eibl, The DuPont Company, Inc., TN Dale Evely, Southern Company Services, AL Kris Gamble, Black & Veatch Corporation, KS David King, American Electric Power Service, OH Daniel Lee, ABB Incorporated, OH W. Scott Matz, Invensys Process Systems, TX John O’Rourke, ALSTOM Power Inc., CT (via teleconference) Michael Polagye, FM Global, MA Thomas Russell, Honeywell, Inc., TX Jimmie Schexnayder, Entergy Corporation, LA Celso Schmidt, UTC, TX Bill Smith, Exothermic Engineering LLC, MO Franklin Switzer, S-afe, Inc., IN Joseph Vavrek, Sargent & Lundy, LLC, IL Henry Wong, URS Corporation E&C, NJ Harold (Skip) Yates, HRY, Inc. Boiler Systems Consulting, MI Allan Zadiraka, OH (via teleconference) Alternates : Joseph Bittinger, American Electric Power Corporation, OH James Franks, XL Global Asset Protection Services, TN Jack Lehman, Exothermic Engineering LLC, NE Daniel May, Burns & McDonnell Engineering Company, MO Jeff Parker, Salt River Project, AZ John Stevens, HF Controls Corporation, TX Guests : D. Paul Cannon, Hurst Technologies Joseph Fehr, Sega, Inc. Frank Fowler, SmartBurn LLC Jerry Gilman, SIS-Tech Ted Jablkowski, Fives North American Combustion Sinming Kwong, Emerson Process Management (via teleconference) Edward Lightbourn, SmartBurn LLC Tony Niu, Guodian Longyuan Technology Austin Pool, Hurst Technologies Donald Zissa, SIS-Tech
II. Minutes of Meeting: 1. Call to order. The meeting was called to order at 8:30 am MST on Jan 14, 2014. Chairman Walz welcomed committee members and guests and thanked them for their participation. 2. Introduction. The Committee members and guests introduced themselves and identified
their affiliation. 3. Minutes Approval. The minutes from the February 2013 meeting were approved as
written. 4. NFPA Staff Report. The NFPA staff liaison reviewed the new document revision process and
tools, including the new terminology, the revision cycle timeline, and the online public input submittal process. (Attachment A) NFPA staff reported that the NFPA Board of Directors approved a formal anti-trust policy at their November 2013 meeting (Attachment B).
5. Old Business.
A. Referenced Documents in Fundamentals Chapters. Mr. Switzer reported that the reference to NFPA 54 is applicable and appropriate.
B. Design Pressures Task Group. The task group scope has been expanded to include the following issues:
i. Current applications have fan capabilities up to 80 in., but the duct work is addressed only in the annex as a consideration. Is it time to establish structural requirements for the duct work?
ii. Does the committee need to review 35 in. limitation to reflect current designs/practices?
iii. The fan requirement is based on “cold, dense air”. Is that a realistic requirement, or should the code reflect typical ambient conditions.
iv. Should requirements be added to address positive pressure units that may be subjected to negative pressure when fuel valves close quickly on an MFT?
v. NFPA 85 refers to test block capability and design pressure inconsistently. Review each section for appropriateness.
The task group will continue to discuss these new questions for further consideration in the next revision cycle. The deadline for the task group report is the first quarter of 2015, or at least 8 weeks prior to the next scheduled meeting. The task group members are B. Smith (chair); D. Evely; J. Frazier; K. Gamble; D. King; J. Lehman; H. Wong; and A. Zadiraka.
C. Annexes B and C (Supervised Manual Systems). A task group was established to discuss this issue further. The task group members are: D. Dressel (chair); J. Eibl ; S. Yates; and A. Zadiraka. The task group recommended that Annex C be removed from the document in the 2015 edition, and that Annex B be retained until the 2019 edition. In addition, committee members and NFPA staff will reach out to chemical and petroleum industry groups to advise them of the upcoming change. These groups include the American Chemistry Council, the Center for Chemical Process Safety, and the American Petroleum Institute. Committee members are encouraged to contact NFPA staff if they identify any other interest groups. The task group was discharged with thanks.
6. New Business A. Create Second Revision of Chapter 6. The committee reviewed the public comments and other requests and created Second Revisions in chapter 6 and related annex text. The committee actions will be available in the Second Draft Report, which will be published no later than July 18, 2014. B. Valve Leak Testing Task Group. In discussion on the Second Revisions, the committee recognized that there are two valve leakage tests: the tightness test performed annually and the leak test performed prior to every startup. A task group was established to review these requirements for oil and gas systems to identify the purpose of each test and determine if both are appropriate and applicable to current practices. The task group members are: J. Parker (chair); P. Cannon; J. Gilman; S. Matz; C. Schmidt; F. Switzer. C. Review BCS-FUN actions. The committee briefly discussed Fundamentals actions of interest. D. Boiler Enclosure Definition/Purge Times. It has been reported that some boilers are being purged for much longer than 5 minutes because of the volume calculation and the requirement for 5 air changes. A task group was established to review and create recommendations concerning the length of purge times and purge rates relative to the size of the unit. The members of the task group are: J. Franks (chair); G. Gilman; D. King; J. O’Rourke; J. Parker; A. Zadiraka. The task group can consider developing a code fund project involving CFD modeling of basic furnace designs. The task group may also seek loss data from insurers, the National Board, and EPRI.
7. Plasma Arc Igniter. Edward Lightbourn and Frank Fowler of SmartBurn LLC presented information on plasma arc igniters (Attachment C). The committee discussed extensively the new technology. A task group was established to review igniter requirements in chapters 4 and 6 to determine what revisions, if any, would need to be made to recognize the application of plasma arc igniters. The task group members are: S. Yates (Chair); J. Eibl; K. Gamble; E. Lightbourn; S. Matz; M. Polagye; and B. Smith. The task group deadline is to provide recommendations at the proposed off-cycle meeting.
8. Other Items. The committee briefly discussed a recent application of a pressurized unit
being converted from coal to gas. Preliminary modeling indicates that the pressure may go significantly negative when fuel valves close quickly on an MFT. Currently, pressurized units don’t have to incorporate implosion protection. This issue was referred to the design pressures task group.
9. Next Meeting. The committee tentatively scheduled an off-cycle meeting in the second
quarter of 2015 in conjunction with a planned meeting of the BCS-SBB committee. Details will be provided as they become available.
10. Adjournment. The meeting adjourned at 11:25 am MST on Jan. 15, 2014.
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NFPA Second Draft Meeting
January 14-15, 2014
PERA Club
Tempe, AZ
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Multiple Burner Boilers
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1PICS Introduction – NFPA MBB Jan 15 2014
Plasma Ignition & Combustion Stabilizing (PICS) Technology
2PICS Introduction – NFPA MBB Jan 15 2014
Plasma Ignition Introduction
� System Benefits
� History of Adoption
� Plasma Ignition Basics
� Ignition Process
� NFPA Classification
� Next Steps
� Appendix
3PICS Introduction – NFPA MBB Jan 15 2014
Objectives
� Introduce PICS to the NFPA MBB Technical Committee
– PICS is widely adopted in China
– YTLY is the leading manufacturer with over 90% market share
– Developed to achieve national goal to eliminate use of oil fuel for
boiler startup/shutdowns
– PICS is of interest to U.S. utilities because of compelling benefits
� Discuss applicable NFPA Code
– Plasma ignition has been on the MBB Technical Committee agenda
since at least 2012
� Discuss next steps
4PICS Introduction – NFPA MBB Jan 15 2014
Plasma Ignition Benefits to Coal Fired Generators
� Payback a combination of:
– Reduced use of igniter fuel – typically oil – for startup/shutdowns
– Better low-load performance from combustion stabilization
– Avoided generation cost during off-peak periods
– New build units can save oil systems, payback during commissioning
� PICS can supplement existing igniters w/o full replacement
� PM emissions lower & collection systems function better during startup
– Mitigates issues with loss of startup/shutdown exemption, if ESP
– Reduces PM collection system maintenance issues
5PICS Introduction – NFPA MBB Jan 15 2014
Benefits to Coal EGUs- Oil Savings
� US EGUs spend up to $1B yearly in support fuel (EIA – 2011 Data)
� Turndown savings may exceed startup cost savings
8PICS Introduction – NFPA MBB Jan 15 2014
PICS Application Milestones
� 1997- Yantai Longyuan began developing plasma ignition technology
� 2000- First oil-free startup using PICS in a 50 MWe unit
� 2002- First T-Fired application of PICS in a 600 MWe unit
� 2004- First Wall-Fired application of PICS in a 600 MWe unit
� 2006- First ultra-supercritical application of PICS in a 1000 MWe unit
9PICS Introduction – NFPA MBB Jan 15 2014
Applications Outside of China
NO Country NameUnit
CapacityRetrofit /
NewFurnace
ConfigurationCoal
1 S. Korea Samchonpo 560MW Retrofit T-firing Bituminous
2 S. Korea Yonghung 870MW New T-firing Bituminous
3 S. Korea Hadong 2 x 500MW New T-firing Bituminous
4 Russia Khabarovsk 3rd 180MW RetrofitSide Wall opposed
firedBituminous
5 S. Korea Hadong 500MW New T-firing Bituminous
6 Indonesia Suralaya 600MW Retrofit Wall firedSub-
bituminous
7 Turkey Eren 2 x 600MW Retrofit Wall fired Bituminous
8 S. Korea Yonghung 2 x 870MW New T-firing Bituminous
� Over 650 Units and 275 GW Installed within China to date
10PICS Introduction – NFPA MBB Jan 15 2014
Plasma Ignition Basics
� Plasma generates ionized gas produced by air flow through electric arc
� High temperature gas is used to directly ignite a portion of burner coal flow
11PICS Introduction – NFPA MBB Jan 15 2014
Principle of PlCS--Plasma Burner
� Typical features of current burner shown – diversity of physical designs from YTLY and others
� Coal abrasion & low NOx features retained
Plasma Lance
Burner “Stages”
Coal Concentration
Features
Stage Support Structure
12PICS Introduction – NFPA MBB Jan 15 2014
Plasma Ignition Basics – Temperature (F)
� Pulverized coal passes through the plasma arc with high temperature
chemically active ions. Coal particles are rapidly gasified, releasing volatile matter which is ignited by the flame.
Side View
Igniter Zone Intermediate
Zone Coal
Flame
Burner Zone
Ignition Zone
Coal Flame
13PICS Introduction – NFPA MBB Jan 15 2014
Plasma vs Conventional Ignition
� Conventional Coal Igniters– Coal is not ignited until just outside the burner tip
– Coal devolatilization and pyrolysis occurs slowly as coal particles heat up
– Electromechanical device
– Max flame temperature (adiabatic, equivalence ratio ideal) 2100 °C (oil) & 1960 °C
(natural gas)
� Plasma Igniter– Portion of coal is lit downstream of the elbow. Initial ignition propagates through
successive stages inside the burner. Flame moves to furnace when igniter turned off
– Concentrated 5000°C (typ) plasma arc quickly shatters & devolatilizes coal (low heating/drying time)
– Solid state device and control systems
– Plasma energy input of 1% of rated burner heat input sufficient to ensure combustion
– Coal is the igniter fuel, so heat input = fuel burned in burners w/ PICS > 10% of boiler
heat input
14PICS Introduction – NFPA MBB Jan 15 2014
Safety Considerations
� Combustion process is engineered – ignition occurs in a controlled space (burner rings) rather than at front of burner in furnace cavity as with an oil/gas igniter
� PA velocity > coal flame propagation speed prevents flame from propagating backward – same as conventional igniters
� Much higher flame temperature rather than oil/gas flame
� High degree of Plasma lit discrimination (high voltage & current condition)
15PICS Introduction – NFPA MBB Jan 15 2014
Safety Considerations
� Plasma generator power supply => solid state reliability
� Multiple instruments verify PICS in service & burner flame:
– Current flow to PICS
– Visual camera
– Redundant main burner flame scanners on main burner (vs one on
igniter & one on burner for oil)
� Performance to be verified by test under 4.7.7.1.1
� Typical problems of oil / gas igniters avoided
– No atomizer tip clogging
– No liquid flow control devices
16PICS Introduction – NFPA MBB Jan 15 2014
Primary Air Requirements
� Primary Air characteristics can have a strong impact on performance of all igniters
� Since PICS works by first igniting the coal volatiles in primary air, an incorrect PA to coal ratio or PA flow rate will impair ability of PICS to complete ignition including char particles
� PICS PA requirements are similar to those of a standard PC boiler/mills
Property PICS ideal range
PICS requiredrange
B&W millsrequired range*
PA Velocity(m/s)
18-20 16-28 15-22
PA/Coal Ratio
2.8-3.3 1.8-4.0 1.6-4.2
*Steam: its generation and use, ed. 41, pg. 13-7
17PICS Introduction – NFPA MBB Jan 15 2014
Classification Discussion
� PICS can accomplish all functions of a Class I Igniter, including ignition and combustion support
� Staged ignition of coal allows PICS to achieve stable coal ignition
despite relatively low heat input
� Plasma temperature is sufficient to ignite coal under all credible
combinations of fuel and air
– Testing under section 4.7.7.1.1 will be performed for each installation rather than
rely on general guidelines which are typically not tested
– A.4.7.7 “Many factors affect the classification of the igniters, including the
characteristics of the main fuel, the combustion chamber and the burner design,
and the igniter capacity and location relative to the main burner”
� 10% Guideline result of intrinsic oil and gas flame characteristics
– Relatively low oil flame temperature, and exposed position in furnace, requires
more energy input to ignite coal volatiles
18PICS Introduction – NFPA MBB Jan 15 2014
Classification Discussion
� 3.3.85.1 Class 1 Igniter. An igniter that is applied to ignite the fuel input through the burner and to support ignition under any burner light-off or operating conditions. Its location and capacity are such that it
will provide sufficient ignition energy, generally in excess of 10 percent of full load burner input, at its associated burner to raise any credible combination of burner inputs of both fuel and air above the minimum ignition temperature.
19PICS Introduction – NFPA MBB Jan 15 2014
Credible Combinations of Fuel and Air
� Propose defining “credible combinations” in terms of percent of the maximum primary air and coal flow for Cold and Hot furnaces
� For MPS 89 Mill propose +/- 3% Coal Flow and +/- 10% air flow uncertainty
Credible Range -
Cold Furnace
Credible Range -
Hot Furnace
20PICS Introduction – NFPA MBB Jan 15 2014
Closing Remarks
� Plasma ignition offers opportunities to:
– Safely improve economic competiveness of coal fired generators
– Reduce emissions
� YTLY is discussing PICS with interested parties:
– NFPA Committee
– Prospective Clients (opportunistically)
• Demonstration projects to prove system value to EGU’s and safety
• Carry out testing to demonstrate ignition under all credible combinations of air & fuel
– Insurers, AHJs & other
� YTLY and SmartBurn are seeking guidance from the committee on the next steps to commercialize the technology in the US.
– Does the MBB Technical Committee believe the current code is adequate?
– Discuss next steps
21PICS Introduction – NFPA MBB Jan 15 2014
Contact Information
SmartBurn, LLC� Frank Fowler, V.P. Of Business Development
– 319-360-5373, [email protected]
� Edward Lightbourn, Engineering Manager
– 608-821-8167, [email protected]
Guodian Longyuan Tech. USA
� Tony Niu, President
– 608-821-8172, [email protected]