What Specifications Should You Send to a CFB Boiler Supplier?

When I request a proposal for a circulating fluidized bed (CFB) boiler, I send more than the required steam capacity. A supplier needs a clear project brief covering steam conditions, fuel properties, operating hours, emissions requirements, site conditions, utility limits, and the required scope of supply. The most important information is the design fuel analysis, because moisture, ash, sulfur, volatile matter, heating value, and particle size directly affect combustion, heat transfer, fuel handling, and emissions control. I also identify the intended application, such as power generation, process steam, cogeneration, or industrial heating.

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A practical specification package should include both numerical data and operating expectations. For example, I might state a steam capacity of 100 t/h, a main steam pressure of 9.8 MPa, and an expected operating schedule of 8,000 hours per year if those values match the project. If some information is not yet confirmed, I label it as preliminary rather than allowing the supplier to treat an assumption as a guaranteed design condition.

Start With the Boiler Duty and Steam Requirements

The first section of my inquiry defines what the boiler must produce and how the steam will be used. I specify the continuous steam flow, maximum or peak flow, minimum stable load, main steam pressure, main steam temperature, and feedwater temperature. I also state whether the steam will drive a turbine, supply a process, support a district heating system, or serve several users with different pressure requirements.

Core boiler duty information

• Rated and maximum continuous evaporation capacity
• Main steam pressure and temperature
• Feedwater temperature and feedwater quality assumptions
• Steam pressure and temperature at the battery limit
• Required turndown or minimum continuous operating load
• Start-up frequency, annual operating hours, and expected load pattern
• Whether the boiler operates independently or alongside existing units

I distinguish between design capacity and normal operating capacity. A boiler that normally runs at 70% load but occasionally reaches full load may require a different control strategy and auxiliary sizing than a unit designed to operate continuously near its maximum rating. I also tell the supplier whether fast start-up, frequent cycling, or stable baseload operation is the priority, because these conditions influence material selection, control logic, and operating procedures.

Provide a Complete Fuel Specification

Fuel information is one of the most important inputs for a CFB boiler design. I provide laboratory data for every planned fuel, including its lower heating value, total moisture, ash content, volatile matter, fixed carbon, sulfur, nitrogen, chlorine, and ash fusion behavior when available. If the project uses blended fuels, I provide the percentage range for each fuel rather than sending only a single average analysis.

Fuel data the supplier should receive

I also describe fuel variability honestly. If moisture may range from 12% to 25%, or if the heating value changes seasonally, I include both the normal and limiting cases. A supplier can then evaluate whether one boiler configuration can accommodate the full range or whether fuel blending, drying, storage, or conditioning should be included in the project scope.

Clarify Emissions and Environmental Requirements

I send the applicable emissions limits and identify the measurement basis. This should include particulate matter, sulfur oxides, nitrogen oxides, carbon monoxide, and any limits for hydrogen chloride, mercury, or other substances required by the local permit. I specify whether the limits apply at a defined oxygen reference level, whether they are expressed as concentration or mass flow, and whether the requirement is based on normal operation or a compliance test condition.

For a CFB boiler, emissions performance may involve several systems rather than the furnace alone. Depending on the fuel and local rules, the project may require limestone feeding, selective non-catalytic reduction, selective catalytic reduction, a baghouse, an electrostatic precipitator, or other flue gas treatment. I ask the supplier to identify the design basis and the expected operating consumables instead of requesting an unsupported universal emissions guarantee.

Describe the Site and Utility Conditions

Site information allows the supplier to check whether the proposed boiler can be installed, operated, and maintained at the project location. I provide the site elevation, ambient temperature range, humidity, wind conditions, seismic requirements if applicable, available footprint, building restrictions, and transportation limitations. If the boiler will be installed in an existing plant, I attach layout drawings, connection points, elevations, and photographs where possible.

Utility and interface data

• Available electrical voltage, frequency, and short-circuit information if required
• Instrument air pressure and quality
• Cooling water temperature, flow, and pressure
• Raw water, demineralized water, and wastewater conditions
• Fuel receiving, storage, and conveying arrangements
• Ash handling, ash storage, and disposal requirements
• Stack height, flue gas connection point, and available duct route

I also state the preferred battery limits. For example, I clarify whether the supplier should include fuel handling, limestone preparation, ash removal, water treatment, flue gas cleaning, chimney equipment, electrical systems, distributed control systems, civil engineering, installation supervision, or commissioning support. Defining these boundaries early makes quotations easier to compare and reduces the risk of missing equipment or duplicated responsibilities.

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Specify Operating, Control, and Maintenance Expectations

I explain how the boiler will be operated, not only what it must produce. Important details include the expected start-up method, cold-start frequency, load ramp requirements, automatic control expectations, operator staffing, and planned maintenance intervals. If the plant must continue operating with one fuel preparation train or one induced-draft fan unavailable, I request that the supplier identify the proposed redundancy philosophy.

Questions I include in the technical inquiry

• What is the expected fuel consumption at rated and normal load?
• What are the auxiliary power consumers and their design margins?
• Which components are considered critical spares?
• What inspection access is provided for pressure parts and refractory areas?
• What maintenance tools, training, manuals, and drawings are included?
• Which performance tests are proposed, and how will test conditions be defined?

I avoid requesting a vague “high-efficiency” or “low-maintenance” design. Instead, I ask the supplier to state the calculation basis, test method, operating range, and exclusions for each proposed performance value. This approach helps me compare proposals using measurable criteria rather than marketing language.

Prepare a Clear Commercial and Project Schedule

Technical specifications are not complete without commercial information. I provide the target delivery location, preferred delivery date, required commissioning date, payment expectations, packaging and export requirements, and the desired validity period for the quotation. If the project has financing, import, or inspection requirements, I disclose them before the supplier prepares a final commercial offer.

I also ask for a document list and a preliminary schedule. The schedule should separate engineering, drawing approval, manufacturing, inspection, shipment, site installation, commissioning, and performance testing. I treat any lead time as project-specific because final timing depends on boiler size, scope, fuel complexity, customization, approval cycles, and the availability of major components.

Common Mistakes to Avoid

One common mistake is sending only the steam capacity and asking the supplier to “design a suitable boiler.” That approach can produce proposals based on different fuel assumptions, emissions standards, battery limits, and performance conditions. Another mistake is providing only average fuel data when the boiler will receive wet, mixed, or seasonal fuel.

I also avoid mixing guaranteed requirements with preferences. I mark each item as mandatory, preferred, or to be confirmed, and I identify the person responsible for approving technical deviations. Finally, I request a list of exclusions, assumptions, and deviations from every supplier so that the lowest initial price is not compared against a more complete scope.

How Genjux Can Support Your CFB Boiler Inquiry

At Genjux, I recommend beginning with a structured technical data sheet rather than a general request for quotation. Our boiler and parts supply team can review the proposed duty, fuel range, steam conditions, emissions requirements, site interfaces, and scope boundaries before preparing a suitable configuration. Where information is incomplete, I prefer to identify the missing data and state the assumptions clearly.

I can also organize the inquiry around the documents needed for supplier evaluation, including a technical offer, heat and mass balance basis, equipment list, utility consumption, preliminary layout, delivery scope, spare-parts recommendation, and commissioning plan. The exact documents depend on the project stage and the requested supply boundary. This structured exchange gives both sides a better basis for technical clarification and commercial comparison.

Key Takeaways for Your Specification Package

• Send steam capacity, pressure, temperature, feedwater conditions, and operating profile.
• Provide complete fuel analysis, including normal and maximum variability.
• Define emissions limits, measurement basis, and required flue gas treatment.
• Share site dimensions, utilities, fuel logistics, ash handling, and connection points.
• Clarify control, maintenance, redundancy, testing, documentation, and training needs.
• Set clear battery limits, commercial conditions, schedule expectations, exclusions, and assumptions.

Conclusion: Send Data That Defines the Real Design Conditions

The best specifications to send to a CFB boiler supplier are the specifications that define the boiler’s actual duty: steam requirements, fuel properties, emissions limits, site conditions, utilities, operating pattern, and supply scope. I do not need every detail to request an initial assessment, but I clearly separate confirmed data from estimates and identify the information still under review. This allows the supplier to make a more transparent technical and commercial proposal.

My next step is to assemble the fuel analysis, steam data, site information, environmental requirements, and scope checklist into one controlled inquiry package. I then ask each supplier to return the same core information, including assumptions, exclusions, performance conditions, auxiliary consumption, schedule, and recommended spares. To discuss your CFB boiler project with Genjux, send us your available data and target requirements so we can help define the next technical and commercial steps.

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