Polymer or Stainless Economiser - ECO
Recover additional heat
Prevent corrosion and fouling problems
Reduce your costs and CO2 emissions
The Economiser recovers waste heat from flue gas or exhaust air
Common economiser problems
Corrosion and mechanical failures with economiser limit waste heat recovery from flue gas or exhaust air
Heat Exchanger corrosion and rust
Flue gases contain acidic elements when using sulphur containing fuels like refinery gas, biogas, coal, oil and biomass. Exhaust air may contain acidic components from the product that is dried or baked.If you want to recover more heat and cool through the acid dew point, acids will condense on the cold tube surface as a result of the cold liquid flowing through the tubes. This leads to corrosion in conventional metal economisers.
Benefits of the polymer or stainless steel ECO
- Resistant for corrosive flue gas and exhaust air
The economiser can be made from bare stainless tubes or tubes lined with polymer. Based on your application we select the most suitable construction material. The polymer economiser can cope with highly corrosive environments.
- Free from mechanical stresses
The unique design of the economiser prevents mechanical stresses resulting from thermal expansion. This makes this economiser a robust and reliable solution.
- Prevent economiser blocking
The low propensity of the applied polymer to bind in combination with the possibility of in-line cleaning make the polymer economiser suitable for fouling services.
Polymer & Concentric Tube (PCT) Technology
The economiser consists of concentric tubes. Cold water is fed via the inner tube. Heat is transferred via the outer tube. The concentric tubes guarantee a proper flow path for the water to maximise heat exchange efficiency. The tubes are fixed in one tube sheet only. The other side of the tubes is free floating. In this way the tubes are not exposed to mechanical stresses.
For highly corrosive applications all parts of the interior of the heat exchanger are made from polymer. With this configuration the economiser prevents heat exchanger corrosion problems
Economiser cleaning and maintenance
Economiser cleaning with water
A cleaning system can be integrated in the economiser to maintain the optimal performance. Spray bars will be integrated in the heat exchanger casing.
The polymer or stainless steel economiser has minimal maintenance requirements.
Technical Polymer or Stainless Economiser details
Economiser operating range
|F:||3.000 – 500.000+ kg/hr|
|Tdesign:||250 °C ( polymer economiser)|
|Pdesign water:||30 barg|
|Pdesign flue gas:||150 mbar|
Economiser thermal expansion
The economiser is designed in such a way that the tubes can thermally expand without stresses acting on the tubes. The economiser can be heated-up and cooled down instantaneously, there is no time dependent heating profile required.
The design of the HeatMatrix economiser is based on the requirements and process data of a specific situation. The dimensions are derived from the hot and cold flows, temperatures and composition of the flows.
The construction materials are selected based on the flue gas composition.
|Stainless steel||For low to modest corrosive environments|
|Polymer||For surfaces in contact with very corrosive flue gas|
The Polymer or Stainless ECO can be applied in these industries and thermal processes
Your path to lower CO2 emissions, energy consumption and costs
Our process engineers assess the technical feasibility of additional heat recovery on your process. The potential reduction in CO2 emissions, energy consumption and costs is determined.
Heat exchanger design and Business Case
A proposal is made with all technical details and economic assessment with payback time. You have everything for budget approval.
Realize Project delivery
HeatMatrix designs, delivers and -upon request- installs a complete heat recovery system in your factory. For bigger projects we work with your preferred Engineering company from start to implementation.
What is the definition of an economiser?
An economiser is used to recover waste heat from flue gas or exhaust air to preheat boiler feed water or process water. Economisers are typically applied on steam boilers but can also be used on other thermal processes like oven, incinerators or dryers.
What is the function of an Economiser?
The purpose of an economiser is to recover waste heat from a flue gas stream and use that heat to preheat boiler feed water or a process water stream. The working principle is that flue gas heat is transferred through the heat exchanger tubes of the economiser to the liquid (water or thermal oil) that is being preheated. Flue gas flows around the tubes and liquid flows inside the tubes. Different designs of economisers are available to deal with corrosion resistance and thermal stresses.
What is the maximum temperature the Economiser can withstand?
The design temperature of the polymer lined ECO is 250ºC. For flue gas or exhaust air of higher temperatures, a stainless steel or a combination of stainless and polymer ECO is applied.
What aspects do I need to consider when installing the Economiser in my plant?
Can the Economiser also be used to heat-up other liquid streams?
Difference Economiser and Air preheater?
Heat recovery from flue gases can be done using air preheaters or economisers depending on the application of the waste heat. Economisers use the flue gas waste heat to preheat boiler feed water or process water. With an air preheater the recovered heat is used to preheat the (combustion) air.