Economizer Manufacturer and Supplier in China Factory
What is an economizer?
Boiler economizer is also called economizer,it is a heat exchange device in the boiler’s tail duct that utilizes waste heat from flue gases to heat boiler feed water, improving thermal efficiency and reducing exhaust gas temperatures.
An economizer is installed in the lower portion of the boiler’s tail duct to recover waste heat. It heats the boiler feed water to saturation at drum pressure, thereby utilizing the heat from the low-temperature flue gases to reduce exhaust gas temperatures, thereby saving energy and improving efficiency.
Economizers are not pressure-restricted and are typically constructed from carbon steel pipes with an outer diameter of 32 to 51 mm. Fins and ribs are sometimes added to the tubes to optimize heat transfer. Economizers typically consist of horizontally arranged parallel elbows (also known as serpentine pipes). They are widely used in industry and are also gaining popularity in agriculture and related commercial sectors.
How Economizers Energy Save
Based on boiler system knowledge, the core function of an economizer is to recover waste heat from flue gases and reduce fuel consumption. Typically located in the boiler’s tail flue, the economizer transfers heat from the high-temperature flue gas to the low-temperature feedwater through heat exchange, raising the feedwater temperature entering the drum. This process not only saves fuel (“coal saving”) but also reduces exhaust gas temperature, aligning with the principle of thermodynamic efficiency optimization.
Economizers improve cycle efficiency by adding a heat recovery process. Specifically, they increase the average heat absorption temperature, thereby improving the efficiency of the entire cycle.
1. By absorbing heat from the low-temperature flue gas, the economizer not only lowers the exhaust gas temperature but also effectively reduces flue gas losses within the economizer, thereby saving fuel.
2. Before entering the drum, the feedwater is heated by the economizer. This not only shortens the time the feedwater absorbs heat on the heating surfaces but also allows the economizer to replace some of the more expensive evaporation heating surfaces.
3. Due to the increased feedwater temperature, the wall temperature difference decreases upon entering the drum, reducing thermal stress and further extending the drum’s service life.
Economizer by Material
Based on the manufacturing material, economizers are classified into cast iron and steel tube economizers. Non-fluidizing economizers are mostly made of cast iron, but some are made of steel tubes. Fluidizing economizers, on the other hand, can only be made of steel tubes. Cast iron economizers are mostly used in boilers with pressures ≤ 2.5 MPa. For pressures exceeding 2.5 MPa, economizers made of steel tubes should be used.
Cast iron economizers are mostly used in boilers with pressures ≤ 2.5 MPa. Non-fluidizing economizers are mostly made of cast iron.
H-type economizers use H-shaped finned tubes and are commonly used for flue gas waste heat recovery in boiler plants.
Both the spiral-finned economizer and the H-type economizer (most commonly used) are finned economizers.
Tube economizers should be made of steel tubes for pressures exceeding 2.5 MPa. Fluidizing economizers can only be made of steel tubes.
Economizers By Industy
Thermal Power Plants: Used to recover waste heat from flue gas to heat condensate or feed water, improving unit thermal efficiency, reducing coal consumption, and reducing pollutant emissions.Industrial Boiler Systems: Applicable to various industrial boilers, such as those in the chemical, textile, and papermaking industries, to recover waste heat from flue gas, improve boiler thermal efficiency, save energy, and reduce production costs.
Power plant boiler economizers recover waste heat from the flue gas at the tail end of coal-fired boilers to preheat feed water and improve thermal efficiency.
Biomass boiler economizers utilize waste heat from biomass combustion flue gas to heat feed water, reducing fuel consumption.
Coal-fired power plant economizers are used in large coal-fired units to recover waste heat from medium- and low-temperature flue gas to preheat condensate.
Designed specifically for industrial flue gas, they recover waste heat through enhanced heat exchange using finned tubes.
Economizer Water Pressure Test
Economizer water pressure test uses water as the medium. Water is injected into the equipment and pressurized to test the equipment’s sealing and pressure-bearing capacity.
Pressure testing is crucial for the safe operation of air coolers. It allows for the timely identification and resolution of equipment problems, such as leaky seals and insufficient pressure-bearing capacity. Failure to identify and address these issues can lead to equipment failures and even accidents. Therefore, pressure testing is not only a test of equipment performance but also a safeguard for industrial safety.
Economizer ODM/OEM
From finned-tube economizers to tubular economizers, Datang provides multi-structure economizer design solutions and drawings, supporting different fuel scenarios such as coal, gas, and biomass, to meet the personalized needs of 10-200 ton boilers.
Boiler Economizer Air Pressure Test
An air pressure test on boiler economizer uses gas as the medium. Pressure testing tests equipment performance by applying pressure. Strictly following operating procedures ensures the safety and reliability of the process and results.
Pressure testing is essential after equipment installation or maintenance. It helps verify the equipment’s sealing and pressure-bearing capacity, ensuring that safety incidents such as leaks or ruptures do not occur during operation.
Nondestructive Magnetic Particle Testing of Economizer
Nondestructive magnetic particle inspection of boiler economizers uses magnetic particles as a detection medium to observe defects in economizer.
Magnetic particle inspection has a sensitivity that can detect discontinuities as narrow as 0.1μm. By combining multiple magnetization methods, magnetic particle inspection is virtually unaffected by workpiece size and geometry, and can detect defects in all directions.
Economizer Package
Payment Terms:T/T, LC
Delivery: 15-30 days after payment
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package: Iron frame packing boxes and the desiccants are put into each package for continental transportation as well. or as required
Economizer Application
An 8-ton coal-fired steam boiler economizer fully utilizes the waste heat from the boiler’s exhaust gas, recovering the heat energy from the low-temperature flue gas and transferring it to the feed water, thereby raising the feed water temperature and reducing heat loss during the boiler heating process.
High exhaust gas temperatures in power plants reduce boiler operating efficiency and increase the unit’s standard coal consumption. Adding a low-pressure economizer to the power plant’s thermal system can lower the exhaust gas temperature.
A coal-fired biomass boiler economizer not only effectively recovers waste heat from the biomass boiler’s exhaust gas, reducing energy consumption, but also improves the thermal efficiency of the entire system and reduces environmental pollution.
As an energy-saving device, a 1-ton oil-fired boiler economizer recovers heat from the boiler’s exhaust gas to preheat the feed water to a certain temperature before feeding it into the boiler, thereby lowering the exhaust gas temperature and improving the boiler’s thermal efficiency.
The operating principle of a boiler economizer for mechanical auxiliary equipment is to recover waste heat from the flue gas at the boiler’s tail end and transfer it to the boiler feed water, thereby raising the initial feed water temperature, reducing fuel consumption, and achieving energy conservation and consumption reduction.
Related Product
Economizer FAQs
A: The boiler economizer can be customized. We can produce it according to your drawings, and we can sign a confidentiality agreement for your patented products. For more information, please contact us.
A: Always a pre-production sample,before mass production;always final inspection before shipment.
Inspection & Guarantee Certificate is supplied with shipment, and the Third Party Inspection is available.
A: One year after shipping.
A: We have workshop can supply all parts of the economizer, and 90% of spare parts can be distributed to any
place in the world within one week!
A: We can arrange for experienced engineers to provide online video guidance on product installation and train your staff on equipment operation and maintenance.
A: We have many professional and technical personnel, more competitive prices and better after-dales service than other companies.
A: Datang has high frequency resistance welding finned tube production line 18, extruded finned tube equipment 30, laser welding finned tube production line 2, wound finned tube production line 12. The annual capacity can reach 100,000 tons, the specification φ 18-273mm finned tube, according to the customer requirements of the standard production, service has exceeded 3000+ enterprises.