When I request a quotation for a circulating fluidized bed (CFB) boiler, I send seven groups of information: required steam or heat output, steam conditions, fuel properties, site conditions, emissions requirements, operating objectives, and commercial requirements. I also include process diagrams, fuel test results, utility conditions, and the preferred delivery scope whenever they are available. These details allow a supplier to size the furnace, bed material system, heat-transfer surfaces, fans, fuel-feeding equipment, ash system, and emissions controls more accurately. Without them, a quotation may be based on assumptions that later affect price, performance, and project schedule.
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A CFB boiler is not selected by capacity alone. Its combustion behavior depends on fuel moisture, ash chemistry, particle size, heating value, and the required steam or hot-water conditions. I recommend sending a structured specification sheet rather than a short request such as “please quote one CFB boiler,” because a structured request makes technical comparison easier.
Start with the required boiler duty and explain how the output will be used. For a steam boiler, specify maximum continuous rating, normal operating load, minimum stable load, steam pressure, steam temperature, feedwater temperature, and whether the steam is saturated or superheated. For a thermal-oil or hot-water application, provide the outlet temperature, return temperature, circulation flow, and required operating pressure.
For example, a request might state a nominal capacity of 50 t/h, a steam pressure of 3.8 MPa, and a superheated steam temperature of 450°C. These are only example values, not a universal design recommendation; the actual figures must come from the process engineer and plant operating requirements.
Fuel information is one of the most important parts of a CFB boiler inquiry. I send the supplier the design fuel, expected fuel range, and any alternative fuels that may be burned during the boiler’s service life. A representative laboratory analysis is preferable to a general fuel name because “biomass,” “coal,” or “solid waste” can describe materials with very different combustion and ash behavior.
| Fuel information | What to provide | Why it matters |
|---|---|---|
| Heating value | Higher or lower heating value, with basis clearly stated | Supports furnace and fuel-feed sizing |
| Moisture | Typical and maximum moisture percentage | Influences ignition, furnace temperature, and fuel consumption |
| Ash | Ash percentage, ash fusion behavior, and chemical analysis | Helps assess slagging, fouling, erosion, and ash handling |
| Particle size | Size distribution, maximum particle size, and foreign materials | Determines crushing, screening, and feeding requirements |
I also identify whether the fuel is uniform or variable and whether it contains chlorine, sulfur, alkalis, metals, or other constituents that may affect corrosion and emissions control. If the fuel analysis is incomplete, I clearly label the values as estimates and ask the supplier to state the assumptions used in the proposal. This is more reliable than presenting uncertain figures as confirmed data.
The supplier needs the project location, ambient temperature range, elevation, seismic requirements, available space, and indoor or outdoor installation conditions. I provide a general layout or plot plan showing equipment boundaries, access roads, lifting limitations, and the connection points for fuel, water, steam, electricity, and flue gas. Local weather conditions can affect fans, insulation, building design, and auxiliary equipment selection.
Utility information should include the available electrical voltage and frequency, instrument-air quality, cooling-water conditions, make-up water quality, and the proposed feedwater-treatment system. I also identify whether the boiler will connect to an existing turbine, process header, district-heating network, or new steam system. These interfaces often determine the practical scope of supply more than the boiler island alone.
I send the supplier the applicable local limits for particulate matter, sulfur oxides, nitrogen oxides, carbon monoxide, and other regulated substances. The specification should state the reference oxygen level, gas condition, measurement basis, and whether limits apply continuously or under a defined operating condition. If the project has a future emissions target that is stricter than the current legal requirement, I include that target at the inquiry stage.
A CFB boiler may use a combination of in-furnace limestone addition, staged combustion, selective non-catalytic reduction, bag filters, electrostatic precipitators, or other systems depending on the fuel and emissions limits. I therefore ask for a complete flue-gas-treatment proposal instead of assuming that the boiler quotation includes every environmental system. I also specify the expected bottom ash and fly ash handling method, ash storage capacity, discharge temperature, and disposal or reuse requirements.
A supplier needs to know whether the boiler will operate continuously, follow process demand, support a power plant, or provide backup capacity. I describe start-up frequency, normal load changes, seasonal operation, planned maintenance periods, and the required availability. If the plant expects frequent cycling, I ask the supplier to address thermal stress, ramping limitations, start-up fuel, and minimum stable load.
Performance requirements should cover guaranteed capacity, efficiency basis, acceptable auxiliary power consumption, outlet emissions, unburned carbon in ash, and steam-temperature control. I ask the supplier to define the test conditions and fuel basis for each guarantee. A performance figure without its reference fuel, ambient condition, and measurement method is difficult to compare between proposals.
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I ask for the proposed materials in high-temperature and erosion-prone areas, including furnace waterwalls, cyclone components, return legs, superheater sections, refractory zones, and ash-contact surfaces. The supplier should explain the design approach for erosion, corrosion, thermal expansion, inspection access, and refractory replacement. Material selection must be connected to the actual fuel chemistry and operating temperature rather than chosen from a generic equipment list.
I also request recommended spare parts, maintenance intervals, inspection points, wear-part replacement procedures, and the expected availability of technical support. A long-term operating plan is particularly important when the boiler will use abrasive fuels, high-ash fuels, or multiple fuel types. The supplier should distinguish between standard maintenance recommendations and project-specific engineering requirements.
To receive a comparable quotation, I define the desired supply boundary. It may include only the pressure parts, or it may extend to fuel preparation, fuel feeders, limestone systems, air and flue-gas fans, dust collection, desulfurization, ash handling, electrical systems, controls, civil interfaces, installation supervision, commissioning, and operator training.
I request a technical offer, equipment list, preliminary layout, utility-consumption schedule, delivery schedule, warranty conditions, exclusions, and a list of buyer-supplied items. I also ask the supplier to separate the base quotation from optional systems so that the purchasing team can compare proposals without confusing different scopes. If installation, commissioning, or performance testing is required, those services should be stated in the inquiry rather than discussed only after the purchase order.
Commercial specifications should include the required shipment date, delivery location, preferred incoterm, packaging requirements, inspection plan, payment terms, and documentation language. I provide any mandatory vendor-registration, import, safety, or quality-document requirements that may affect procurement. For large equipment, I also confirm whether the site can receive oversized components and whether local assembly is necessary.
Lead time should be requested as a project schedule with engineering, approval, manufacturing, inspection, shipment, installation support, and commissioning milestones. I avoid treating an early budget estimate as a binding delivery promise because the final schedule depends on design approval, material availability, inspection requirements, and scope changes.
The most common mistake is sending only the desired steam capacity while omitting fuel analysis and operating conditions. Another is providing a single “typical” fuel value when the actual fuel varies significantly by season, supplier, or waste stream. I also avoid mixing confirmed data, preliminary estimates, and future expansion assumptions without labeling each category.
At Genjux, I recommend beginning with a project data sheet that separates required information from optional information. Our technical team can review the stated capacity, steam conditions, fuel characteristics, site parameters, emissions objectives, and supply boundary before preparing a CFB boiler proposal. Where information is missing, we can identify the engineering assumptions that must be confirmed instead of presenting them as final design values.
We can also help organize the inquiry around the complete boiler island, including combustion equipment, heat-transfer surfaces, fuel and limestone feeding, ash discharge, air and flue-gas systems, emissions-control interfaces, instrumentation, and after-sales support. The exact configuration depends on the project data and applicable requirements. A clear technical review at the beginning helps the buyer compare alternatives on capacity, operating flexibility, lifecycle support, and total scope—not only on the initial equipment price.
To answer the question directly, send your CFB boiler supplier the required output, steam or heat conditions, complete fuel analysis, load profile, site and utility data, emissions limits, ash-handling requirements, performance expectations, preferred materials or design standards, scope of supply, schedule, and commercial conditions. The fuel and operating profile are especially important because they influence combustion design, heat-transfer surfaces, emissions equipment, and maintenance planning. If some data is unavailable, mark it as provisional and ask the supplier to state the assumptions used.
As a practical next step, I would prepare a one-page process summary, attach the available fuel laboratory report, provide a plot plan and utility schedule, and list all required guarantees and exclusions. I would then ask Genjux to review the data and return a proposal with a defined scope, technical deviations, assumptions, and clarification list. This approach gives the purchasing team a more dependable basis for technical evaluation, budgeting, and final supplier selection.
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