How does WHB collect waste heat?

The Waste Heat Boiler captures waste heat by utilising the high potential thermal energy from industrial processes that would otherwise be wasted. The WHB system transfers this heat energy through heat exchangers to the water piping system, producing steam or hot water. This process significantly improves the energy efficiency of industrial plants and reduces operating costs.

What is WHB and why is waste heat recovery important?

Waste Heat Boiler (WHB) is a heat recovery system that collects and utilises waste heat generated as a by-product of industrial processes. The system converts this otherwise wasted energy into useful heat or steam.

Waste heat recovery is a key part of sustainable industry. Many industrial processes produce significant amounts of higher temperature gas or liquid, which contains valuable energy. WHB systems allow this energy to be recovered for electricity generation, process heating or other industrial needs.

In terms of energy efficiency, waste heat recovery can reduce the overall energy consumption of a plant by 15-30%. This means direct savings in energy costs and at the same time a significant reduction of the carbon footprint. The environmental impact is significant, as efficient heat recovery reduces the need for and emissions of fossil fuels.

How does the WHB system technically collect and use waste heat?

The WHB system works on the principle of heat transfer, where hot process gases are passed through a heat exchanger. The system water piping is in the path of gas flow, where heat energy is transferred from gases to water by convection and radiation.

The technical process starts when hot process gases (typically 800-1200°C) flow into the heat exchanger of the WHB. The tubes of the system contain water, which is heated and vaporised by the heat of the gas flow. The resulting steam is collected in a steam boiler and passed on to the applications.

Key components include the heat exchanger, water piping, steam boiler and gas cleaning system. The efficiency of heat transfer depends on the size of the surfaces, the temperature difference and the gas flow rate. The system is always designed on a process-specific basis to achieve optimum efficiency.

In addition to steam generation, WHB removes dust and impurities from process gases. The particles adhere to the surfaces of the water pipes, facilitating subsequent gas cleaning and protecting other parts of the system.

Which industrial processes benefit most from WHB solutions?

Metallurgical industry benefits particularly from WHB systems, as the smelting processes produce large quantities of higher temperature gases. Flash smelting, copper production and steel production are typical applications where temperatures exceed 1000°C.

The cement industry is another major beneficiary. The process gases from cement kilns contain a large amount of thermal energy that can be recovered for electricity generation or process preheating. In the chemical industry, catalytic processes and combustion processes offer similar opportunities.

Waste incineration plants represent a growing area of application. The hot flue gases from incineration processes contain a significant amount of recoverable energy. WHB systems enable this energy to be converted into electricity or district heating.

The glass and ceramics industries also benefit from WHB technology. The high temperatures and continuous production in kiln processes create ideal conditions for efficient heat recovery. The nature of the processes allows for a steady energy production all year round.

What are the energy efficiency and environmental benefits of WHB?

WHB systems bring significant energy savings by reducing the need for external energy. The waste heat recovered replaces fossil fuels or reduces the need to buy electricity, which is directly reflected in operating costs.

Reducing the carbon footprint is one of the main environmental benefits of WHB technology. When waste heat replaces fossil fuels, emissions are significantly reduced. Efficient heat recovery can reduce a plant's carbon dioxide emissions by 20-40%, depending on the process.

The reduction in operating costs is not only due to energy savings, but also to the long life of the system and low maintenance requirements. A well-designed WHB system will operate reliably for decades with minimal maintenance. The investment typically pays for itself in 3-7 years.

Supporting the Sustainable Development Goals is increasingly important for industry. WHB technology helps companies meet their environmental targets and tightening emission requirements. At the same time, it improves energy self-sufficiency and reduces dependence on external energy sources.

How is the performance of the WHB system measured and optimised?

Efficiency is the key measure of the performance of the WHB system. It indicates how much of the available thermal energy can be utilised. A good WHB system achieves an efficiency of 70-85% under optimal conditions.

Heat recovery capacity is measured in megawatts (MW) or kilowatts (kW), which tells you how much energy a system produces in a unit time. Steam production is monitored in tonnes per hour, which helps to assess the capacity of the system in relation to demand.

Optimisation starts with the adjustment of process parameters. Gas flow rate, temperature and purity directly affect heat transfer efficiency. Regular cleaning keeps heat transfer surfaces clean and maintains optimal performance.

Critical indicators for maintenance are the risk of pipe failure, corrosion monitoring and the condition of heat transfer surfaces. Predictive maintenance is based on continuous monitoring and regular inspections. Timely maintenance prevents costly outages and significantly extends the life of the system.

The advanced automation of WHB systems enables real-time optimisation. Sensors monitor temperatures, pressures and flow rates, and the control system automatically adjusts parameters according to changing conditions. This maximises energy production and minimises operating costs.