Advanced Boiler Cleaning Solutions for Increased Boiler Runtime

2011 ◽  
Author(s):  
Brandon Billings ◽  
Greg Rodia ◽  
Ryan Scavone ◽  
Marc Tirkschleit
Keyword(s):  
Temperature Rise ◽  
Flue Gas ◽  
Operating Experience ◽  
Waste To Energy ◽  
Gas Temperature ◽  
Energy Facility ◽  
Custom Design ◽  
Boiler Operation ◽  
Clean System ◽  
Pressure Water

Clyde Bergemann Power Group (CBPG) and Covanta Niagara, a Waste-to-Energy facility (WTE) plagued by boiler cleanliness issues, have collectively worked to implement a Shower Clean System (SCS) trial in Boiler 3’s second pass. The SCS’s cleaning concept is designed to traverse down through the roof of the boiler into a narrow open pass using a custom design water spray nozzle to clean the water walls. A SCS trial assembly was operated at the facility from July 27, 2010 to September 1, 2010. A total of 16 cleaning cycles were performed. During this trial period, on average, the second pass outlet flue gas temperature saw a 62 degrees Fahrenheit (degF) reduction after a cleaning event was performed. Based on years of SCS operating experience, CBPG determined a cleaning event should not be initiated if the temperature rise in the second pass is less than 30 degF. This insures that the second pass would not be over cleaned causing material stress to the water walls. In order to estimate the proper cleaning frequency for Niagara’s permanent SCS, an average second pass fouling rate was calculated. Using the fouling rate and the minimum allowable flue gas temperature rise, a cleaning frequency was estimated. Based on the trial results, the recommended operating frequency of the permanent SCS at Covanta Niagara will employ the Umbrella nozzle in the second pass twice per day or once per shift (12 hours). This recommendation is based on observations of the six week operating trial of the SCS and is subject to change based on myriad variables such as waste characteristics and first pass outlet flue gas temperatures. Typical boiler operation at Niagara utilizes industrial cleanings once per week to extend its boiler runtime. During the six week trial the SCS helped reduce the total number of industrial cleanings necessitated to keep the boiler online. Once a permanent SCS is implemented and used daily, there could be significant benefits to boiler runtime without having a total dependence on industrial cleanings. Becoming more reliant on the SCS to maintain lower boiler flue gas temperatures will result in less costs associated with online boiler cleaning and potentially less damage to the third pass convective surface from less high pressure water washing.

Analysis of Boiler Fouling and Boiler Cleaning Methods at the Commerce Refuse-to-Energy Facility

2007 ◽  
Author(s):  
Matthew A. Eaton
Keyword(s):  
Flue Gas ◽  
Differential Pressure ◽  
Operating Conditions ◽  
Waste To Energy ◽  
Gas Temperature ◽  
Energy Facility ◽  
Rate Of Increase ◽  
On Line ◽  
One Year ◽  
Cleaning Methods

Waste-to-energy boiler fire-side fouling is a major operational issue for many facilities, including the Commerce Refuse-to-Energy Facility. The Commerce Refuse-to-Energy Facility is a 350 ton per day, mass burn waterwall facility that began operation in 1987. Fouling occurs throughout the convection sections with the highest differential pressure occurring across the generating bank. Flue gas differential pressures and temperatures have been tracked and analyzed at the facility for approximately ten years during various operating conditions. It has been determined that the rate of increase of the differential pressure across the generating bank is correlated with flue gas temperature and the extent of fouling. Several different cleaning methods have been used to clear the convection zone of ash deposits, including off-line hydroblasting, on-line hydroblasting, on-line explosives cleaning, sootblowers and sonic horns. Better understanding of the fouling trends and evaluation of cleaning methods has led the facility to use a combination of on-line hydroblasting and explosives cleaning and off-line hydroblasting. The facility is now able to operate one year between planned outages, compared to ten weeks during the initial operation of the facility. Additional savings have also been achieved by reducing induced draft fan load, and possibly a reduction in tube wastage.

A Carbon Injection System on a COHPAC-Equipped Waste-to-Energy Facility

2001 ◽  
Author(s):  
Thomas S. Honeycheck ◽  
Gregory H. Gesell ◽  
Mark C. Turner
Keyword(s):  
Flue Gas ◽  
Municipal Waste ◽  
Waste To Energy ◽  
Injection System ◽  
Mercury Emissions ◽  
Gas Cleaning ◽  
Energy Facility ◽  
Carbon Injection ◽  
Maximum Achievable Control Technology ◽  
Municipal Waste Combustor

Abstract The SEMASS Resource Recovery Facility (SEMASS) is a processed refuse fuel (PRF) waste-to-energy plant serving much of Southeastern Massachusetts. Units 1 and 2 at the plant were designed with spray dryer absorbers (SDAs) and electrostatic precipitators (ESPs). A review of historical data from the plant indicated that in order to comply with the Environmental Protection Agency’s Municipal Waste Combustor (MWC) Rule (40 CFR Part 60, Subpart Cb), which is known as the Maximum Achievable Control Technology (MACT), improved emission performance would be required from the flue gas cleaning system on Units 1 and 2. A pilot test program was conducted which led to the installation of COHPAC, or COmpact Hybrid PArticulate Collector units (i.e. flue gas polishing devices) downstream of the ESPs on these two combustion trains. The COHPAC units were successfully started up in June, 2000. In addition to these modifications, it was determined that further control of mercury emissions would be required. A system to inject powdered activated carbon into the flue gas was added to the plant. This paper describes that carbon injection system. A comparison between test data obtained at SEMASS is made with predictions based upon the EPA testing at the Ogden Martin Systems of Stanislaus, Inc. Municipal Waste Combustor Facility near Crows Landing, California and the EPA testing at the Camden County Municipal Waste Combustor in Camden, New Jersey. These are waste-to-energy plants, the former utilizing an SDA and a baghouse while the latter contains an SDA followed by an ESP. In addition, the effect of carbon injection location upon mercury reduction was investigated. The results of that study are also included.

Development of a Laboratory-Scale Pilot for Studying Corrosion on MSWI Heat Exchangers

2008 ◽  
Vol 595-598 ◽  
pp. 271-280 ◽  
Author(s):  
Florimonde Lebel ◽  
Christophe Rapin ◽  
Jean François Mareche ◽  
Renaud Podor ◽  
Xavier Chaucherie ◽  
...  
Keyword(s):  
Flue Gas ◽  
Heat Exchangers ◽  
Laboratory Scale ◽  
Waste To Energy ◽  
Metal Loss ◽  
Gas Temperature ◽  
Fireside Corrosion ◽  
The Face ◽  
Corrosion Scales ◽  
Corrosion Mechanisms

The efficiency of Waste-to-Energy (W-t-E) boilers is affected by fireside corrosion of the heat exchangers that involve unexpected shutdown of facilities for repairs and limit the increase of steam conditions used to produce electricity. The parameters governing fireside corrosion are various and mechanisms are very complex, nevertheless, they are relatively well documented in the literature. In this paper, a laboratory-scale corrosion pilot, which reproduces MSWI boilers conditions, is described. The specificity of our approach includes simultaneous simulation of the temperature gradient at flue-gas/tube interface, the velocity of flue-gas and ashes. Corrosion rates obtained on Tu37C carbon steel at a metal temperature equal to 400°C and a flue gas temperatures of 650°C and 850°C (1100 ppm HCl, 110 ppm SO2 and synthetic ashes free of heavy metals) are respectively around 1.6 2m/hour and 5.6 2m/hour. Preferential metal loss, attributed to erosion-corrosion phenomena, is also observed at low flue-gas temperature (T=650°C) on the face exposed at 90° to the flue-gas. The analysis of corrosion scales demonstrates the reproducibility of results and the reliability of corrosion mechanisms determined from experiments, with degradation observed similar to superheater tubes from EfW facilities. Thus, the corrosion pilot developed can be used as an accurate simulator of the environment encountered in MSWI.

Superheater Life With Stainless, Inconel, and Carbon Steel Alloys at the Maine Energy Recovery Company

2004 ◽  
Author(s):  
Ken Robbins ◽  
Ken Huard ◽  
John King
Keyword(s):  
Energy Recovery ◽  
Waste To Energy ◽  
Production Operation ◽  
Gas Temperature ◽  
Turbine Generator ◽  
Design Changes ◽  
Energy Facility ◽  
Refuse Derived Fuel ◽  
Commercial Operation ◽  
History Of

The Maine Energy Recovery Company is a refuse derived fuel (RDF) waste to energy facility that began commercial operation in 1987. The facility consists of an RDF production operation, two B&W boilers which produce 210,000 lb/hr of steam at 650 psig/750F with a design Furnace Exit Gas Temperature of 1700 F, and a 22 MW steam turbine generator. Since startup, the facility has suffered fireside erosion/corrosion of the waterwalls, superheater, and generator bank hot side sections. Through the years, Maine Energy has made various operational and design changes in order to improve combustion and overall boiler availability. While combustion has improved as evidenced by improved emissions, reduced supplemental fuel usage, and lower ash production, superheater availability has suffered. At the same time reliability of the waterwall and generating bank components have improved. This paper will present a history of Maine Energy’s efforts to improve its superheater availability including a summary of the tube wastage rates for various superheater alloys, as well as Maine Energy’s plans for its superheaters.

The Effects of Varied Hydrogen Chloride Gas Concentrations on Corrosion Rates of Commercial Tube Alloys Under Simulated Environment of WTE Facilities

2008 ◽  
Author(s):  
Shang-Hsiu Lee ◽  
Marco J. Castaldi
Keyword(s):  
Flue Gas ◽  
Metal Temperature ◽  
Waste To Energy ◽  
Composition Analysis ◽  
Gas Composition ◽  
Gas Temperature ◽  
Elementary Composition ◽  
Corrosion Rates ◽  
Simulated Environment ◽  
Hcl Concentration

In order to clarify the effects of HCl concentrations on corrosion rates of commercial tubing in Waste-to-Energy (WTE) boilers, a corrosion test was made by altering the HCl concentration from 0 to 1000ppm, together with simulated flue gas composition. Three commercial tubing SA178A, SA213 T11 and NSSER-4 samples were investigated under a well controlled thermal gradient where the gas temperature was at 700°C and metal temperatures ranged from 480 to 580°C. The duration of each test was 100 hours. The posttest analyses included observations of surface morphology and elementary composition analysis of corrosion products by scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The corrosion rates were acquired by measuring the mass loss of samples after the test. The results showed that the addition of HCl to the flue gas increased the corrosion rates of test samples, but the relation between the HCl concentration and corrosion rate was not linear. The HCl effects on corrosion rates were more prominent when its concentration changed from 0 to 500ppm. In addition, the HCl effects were promoted by the increase of metal temperature in particular when metal temperature was over 560°C.

Discuss on Post Combustion Characteristics of the 116MW Circulating Fluidized Bed Hot Water Boiler

2013 ◽  
Vol 291-294 ◽  
pp. 1714-1718
Author(s):  
Guo Li Qi ◽  
Jian Guan ◽  
Hao Leng
Keyword(s):  
Fluidized Bed ◽  
Temperature Rise ◽  
Flue Gas ◽  
Circulating Fluidized Bed ◽  
Performance Testing ◽  
Hot Water ◽  
Outlet Temperature ◽  
Boiler Efficiency ◽  
Boiler Operation ◽  
Boiler Design

116MW circulating fluidized bed hot water boiler performance testing was carried out that found that burning high volatile lignite had post combustion phenomenon of separator yet. The phenomenon of post-combustion research results show that flue gas outlet temperature rise of the separation can be significantly reduced by adjusting the twelve wind ratio; Increasing coal-fired granularity which was able to reduce the separator post combustion phenomenon; Moderate post combustion of separation was able to improve boiler efficiency and reduce N2O. These results can provide guidance for improving boiler operation technology and improving the boiler design standard.

scholarly journals Optimisation of carbon capture from flue gas from a Waste-to-Energy plant using surrogate modelling and global optimisation

2021 ◽  
Vol 76 ◽  
pp. 55
Author(s):  
Anders Andreasen
Keyword(s):  
Flue Gas ◽  
Process Simulation ◽  
Carbon Capture ◽  
Surrogate Models ◽  
Waste To Energy ◽  
Gas Temperature ◽  
Efficient Calculation ◽  
Energy Plant ◽  
Process Simulations ◽  
G Ratio

The optimisation of Post Carbon Capture (PCC) from a Waste-to-Energy plant has been studied using Kriging surrogate models trained from a set of rigorous process simulations. The surrogate models allow fast and efficient calculation of model responses required for the optimisation of operating parameters. Optimisation is performed using Differential Evolution (DE) requiring a vast amount of function calculations (>1000) which would be extremely time consuming if done with a rigorous process simulation model. It is found that for meeting a CO2 removal efficiency of 85% for a flue gas containing 12.6 mole % CO2 and a reboiler temperature limited to max. 120 °C, a L/G ratio of approx. 2.2 (kg/kg) is optimal. This is accompanied by a stripper/regenerator pressure of 1.85 bara, a temperature of the flue gas at the lower bound, a temperature approach of the lean amine entering the absorber of 6.5 °C (to the flue gas temperature), and a temperature approach in the L/R heat exchanger of 5 °C. The optimal lean and rich amine loading is approx. 0.21 and 0.52 (mole CO2/mole MEA).

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