M HEAVY TECHNOLOGY

30/10/2026

How Fine Coke Fractions Can Be Used in Blast Furnace Ironmaking.

Fine coke fractions and sinter screening fines are often excluded from conventional blast furnace burden due to the specific requirements for burden preparation and charging.
However, with an appropriate charging strategy, these materials can be incorporated into the blast furnace burden and used in the ironmaking process.

M HEAVY TECHNOLOGY specialists have practical experience in developing charging algorithms that make it possible to involve fine coke fractions, including coke breeze and small coke particles, in blast furnace operation.

The key is to determine not only how much material can be introduced, but also how it should be distributed across the furnace burden.

The same principle applies to fine sinter fractions and metallurgical briquettes produced from industrial waste. Their use requires consideration of material properties and the specific conditions of blast furnace operation.

M HEAVY TECHNOLOGY has practical experience with charging solutions involving up to 70 kg of fine coke per tonne of hot metal. The company's experience also includes the use of up to 70 kg/t of fine sinter fractions and metallurgical briquettes.

Such approaches can help make more effective use of available raw materials, reduce coke consumption and improve the utilisation of the reducing potential of blast furnace gases.

The engineering challenge lies in adapting the charging pattern to the characteristics of the materials and the operating conditions of each individual furnace.

Is it possible to increase productivity and simultaneously reduce production costs without spending millions on the equipment upgrade?M HEAVY TECHNOLOGY knows the answer.

23/10/2026

Why Hot Blast Stove Modernization Starts with Combustion Analysis

An ageing hot blast stove can lose efficiency long before it reaches the end of its service life.

Cracks in the partition wall, uneven temperature distribution and refractory deformation can disrupt combustion, reduce heat transfer and compromise the reliability of the entire unit.

When modernizing such equipment, replacing worn components is not enough. The underlying causes of inefficient operation must first be identified.

During the modernization of Hot Blast Stove No. 4 at Kametstal Steel Plant, carried out by M HEAVY TECHNOLOGY in 2020–2021, CFD modelling was used to analyse combustion chamber configurations and burner performance.

The analysis revealed problems with temperature distribution and gas-air flow patterns when using a conventional pipe-in-pipe burner.

The proposed solution involved two key changes:

▪️ Ceramic burner installation. Its flame configuration was designed to improve gas-air mixing and distribute heat more effectively along the combustion chamber, helping reduce local overheating and refractory damage.

▪️ Checkerwork modification. Replacing the existing checkerwork with smaller channels increased the heat-transfer surface area, improving the conditions for heating the blast air.

The modernized Hot Blast Stove No. 4 was commissioned in September 2023.

The engineering principle is straightforward: the performance of an existing hot blast stove can often be improved by addressing the combustion and heat-transfer mechanisms that limit its operation.

CFD modelling helps evaluate design options before implementation, while equipment modernization can extend service life and improve thermal performance without replacing the entire unit.

15/10/2026

How to Monitor Blast Furnace Lining Wear During Operation

The condition of a blast furnace lining cannot be assessed by direct inspection while the furnace is operating. Yet changes in refractory thickness, protective skull formation and thermal loads can affect both furnace reliability and campaign life.

Continuous monitoring of the lining's thermal condition is therefore an important part of reliable blast furnace operation.

At M HEAVY TECHNOLOGY, we use system to assess the condition of blast furnace hearth and shaft linings based on temperature measurements and cooling-system data.

By combining data from thermocouples and cooling circuits, the models help estimate key parameters, including:

▪️ Residual refractory thickness and protective skull thickness,
▪️ Thermal loads on individual cooling elements,
▪️ The depth and distribution of lining wear,
▪️ Changes in the furnace working profile and total heat losses.

The results can be presented as trends, horizontal and vertical wear profiles, and visual maps of the lining condition. The monitoring system can also alert personnel when measured or calculated parameters exceed specified limits and identify sensors that require inspection.

The engineering value lies in combining individual measurements into a consistent picture of the lining's condition over time.
Instead of relying on isolated temperature readings, plant personnel can track changes, identify developing trends and make better-informed decisions about furnace operation and maintenance.

Monitoring does not eliminate refractory wear. It helps make that wear measurable, allowing operators to manage the condition of the furnace with greater confidence.



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How the blast furnace relining process happens, how to choose materials and technologies, create and implement a relining project from the experience of M Heavy. Click to read.

06/10/2026

Coke consumption in a blast furnace depends not only on fuel quality and burden composition.

An important role is also played by how the burden materials are distributed during charging.

The blast furnace process is based on counter-current movement: the burden descends while hot gases rise through the furnace. The efficiency of iron reduction depends to a significant extent on how effectively these flows interact within the furnace working space.

Changing the charging pattern changes the distribution of materials across the furnace cross-section and, consequently, the conditions under which gas passes through different zones.

Therefore, even with the same burden composition, different operating results can be achieved.

Of particular interest is the utilisation of materials that are normally considered waste or secondary fractions.

For example, certain coke and sinter fractions can, under an appropriate charging strategy, be returned directly to the blast furnace.

But simply adding these materials to the burden is not enough.

It is important to understand where and how they should be charged.

The distribution of materials across the furnace cross-section affects gas flow, reduction conditions and the utilisation of the reducing potential of the ascending gases.

With a properly selected charging pattern, existing material resources can be utilised more effectively while reducing fuel consumption.

Therefore, charging optimisation is not only a matter of blast furnace productivity.

It is also a tool for controlling the cost of hot metal production.

In blast furnace operation, the economic result can depend not only on what we charge into the furnace, but also on how effectively we distribute those materials within it.

30/09/2026

Sintering performance depends on how consistently the conditions required for the sintering process are maintained throughout the entire burden layer.

One of the key factors is the permeability of the sinter bed.

Modern iron ore preparation involves significant amounts of finely ground materials. In their original form, these materials have insufficient gas permeability, so the burden must be prepared and granulated before sintering.

During granulation, fine particles are formed into granules that create the bed structure required for air to pass through.

This is directly related to the sintering process itself.

Air is drawn through the burden layer, providing the oxygen required for the combustion of solid fuel. As the sinter machine moves, the combustion front progressively passes through the entire thickness of the bed.

High temperatures develop in the combustion zone, providing the conditions required for the softening and partial melting of the material. The resulting liquid phase binds the burden particles during cooling and forms a strong, porous sinter.

Thus, gas permeability, airflow, combustion and heat transfer are interconnected elements of the same process.

At the same time, the objective of sintering is not limited to producing a sintered product.

The sinter must have the required chemical composition, size distribution, strength and reducibility, as its properties directly affect the conditions of subsequent blast furnace operation.

Therefore, sintering performance cannot be evaluated based on a single parameter.
The engineering task is to ensure stable interaction between burden preparation, gas permeability, airflow and the thermal regime — from granulation to the formation of the final sinter.

22/09/2026

Why Industrial Water Systems Cannot Be Designed Separately from the Production Process

The requirements for an industrial water supply system are strict and are determined by the production process it serves.

Different production units require different water quality, temperature, flow rates and levels of treatment. Cooling systems, recirculating water systems, gas cleaning and other consumers may have completely different requirements.

This creates an important engineering challenge: the water supply system must be designed as part of the production process.

All processes are interconnected.

Therefore, decisions made in the water supply system affect equipment operation, maintenance requirements, energy consumption and the stability of the production process.

This is particularly important when designing recirculating water systems.

The objective is not simply to return water to the production process.

The system must maintain the required water balance, control the accumulation of dissolved and suspended substances, remove heat loads and ensure the required water quality.

Therefore, the water cycle must be considered together with the production process from the early stages of design.

Thus, the most efficient water supply system is a system designed according to the actual operating conditions and requirements of the specific production process.

Industrial water engineering starts with understanding the production process.

14/09/2026

What Limits Blast Furnace Productivity?

Actual blast furnace productivity is determined by how effectively the furnace operates within its technological and process constraints.

One of the key factors is the interaction between the burden and the ascending gas flow.

The burden must descend steadily through the furnace, while the gas flow provides the heat and mass transfer required for efficient reduction. Any significant deviation from the desired gas distribution can affect burden permeability, temperature profiles and the overall stability of the process.

This makes burden distribution one of the critical factors in furnace operation.

The charging pattern determines how iron-bearing materials and coke are distributed across the furnace cross-section. This directly affects local permeability, gas velocity and thermal conditions in different zones of the furnace.

The properties of the burden materials are equally important.

Particle size distribution, fines content, reducibility, as well as the quality of sinter and pellets, affect burden permeability and reduction efficiency. Changes in these parameters can therefore alter the operating conditions even when the furnace itself remains unchanged.

Blast parameters also define the limits of stable operation.

Hot blast temperature, blast volume, oxygen enrichment and pressure affect the thermal balance, gas flow and process intensity. These parameters cannot be optimized independently: changing one can alter the conditions under which the others operate.

Therefore, blast furnace productivity cannot be evaluated based on a single parameter.

The engineering task is to identify the factors that actually limit furnace operation under a given regime and understand how they interact.

Stable operation at high intensity is the result of a balanced process — from burden preparation and charging to gas distribution, heat transfer and blast parameters.

The question is not simply how much a blast furnace can produce.

It is important to understand how stably and efficiently the process can operate within its actual technological limits.

02/09/2026

❓ What makes an industrial Solid Heat Carrier (SHC) pyrolysis plant economically viable, and where does the ROI come from?

The shift toward waste recovery and resource efficiency isn't just an environmental initiative - it is a high-margin business powered by multiple revenue streams.

For a standard SHC-200 plant (processing 200 tons/day with an estimated CAPEX of $40M), projected financial metrics under favorable market conditions show:

📈 Plastic waste recycling: IRR 20–40%
📈 End-of-life tire pyrolysis: IRR 15–30%

What drives the financial stability of an SHC project?

✔️ Gate Fee revenue: Earning income as soon as waste feedstock arrives at the plant;
✔️ High-value product sales: Monetizing pyrolysis oil, recovered carbon black, or char;
✔️ Secondary energy recovery: Utilizing internal fuel gas and selling excess heat or power to the grid.

Final financial KPIs (IRR, NPV, Payback Period) are always project-specific. They depend on feedstock composition, regional energy tariffs, and local logistics.

The M HEAVY TECHNOLOGY team builds custom techno-economic models for every project, helping investors optimize CAPEX and lock in predictable OPEX.
Want to evaluate the economics for your feedstock? Contact us to initiate a Feasibility Study!

26/08/2026

Building an industrial Solid Heat Carrier (SHC) plant comes down to risk management and guaranteeing ROI.

The M HEAVY TECHNOLOGY team supports SHC projects at every stage, helping turn alternative feedstocks into high-value products while optimizing both CAPEX and OPEX.

Our end-to-end engineering lifecycle includes:

🔬 1. Technology Validation & Feedstock R&D
✔️ Laboratory testing and mass-energy balance calculations;
✔️ Analysis of specific process behaviors (coking, particle agglomeration, ash residue);
✔️ Pilot plant testing to prevent costly redesigns during construction.

📐 2. Advanced Engineering & Digital Modeling
✔️ Feasibility studies with precise CAPEX/OPEX forecasts and ROI calculations;
✔️ Full packages of Basic & Detail Engineering;
✔️ 3D spatial modeling (BIM) alongside CFD and thermal analysis in ANSYS.

🏗️ 3. Construction, Commissioning & Support
✔️ Equipment selection and vendor audits;
✔️ On-site engineering control and installation supervision;
✔️ Commissioning, safe startup, and ramp-up to design capacity;
✔️ Client personnel training and technical support.

A comprehensive preparation phase is the primary safeguard against technical errors and financial losses.

Planning an SHC or pyrolysis project? Contact us to discuss your feedstock specifications!

17/08/2026

The global energy landscape is shifting rapidly.

Depleting traditional hydrocarbon reserves, price volatility, and tightening environmental regulations leave industry with a critical question: Where do we find reliable, sustainable feedstock?

Relying solely on conventional oil and gas is becoming a risky strategy. Today, the key competitive advantage lies in turning alternative resources into high-value products:

♻️ Municipal and industrial waste (RDF, SRF, plastics, tires)
🛢️ Unconventional fossil fuels (Oil shale, low-grade coal, peat)
🌱 Industrial by-products (Sludges, refinery and wood processing waste).

Unlocking the potential of such non-standard raw materials requires advanced thermal processing technologies, such as Solid Heat Carrier (SHC) pyrolysis.

With the right approach, processing alternative feedstock:
✔️ Solves the waste management challenge;
✔️ Reduces energy dependency;
✔️ Guarantees a stable raw material supply;
✔️ Generates new revenue streams from pyrolysis oil, gas, and char.

The technology exists. The main challenge is navigating the path from raw waste to an operating industrial plant.
In our next post, we will break down the engineering roadmap required to turn complex feedstock into a profitable industrial asset!