- Name: Boiler Economizers
- Fin tube type: H Finned Tube
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Boiler economizer is a special device installed under the exhaust pipe at the tail end of industrial boilers to recover and utilize the waste heat of the exhausted smoke. The heat of the temperature flue gas reduces the exhaust temperature of the flue gas, saves energy and improves efficiency, so it is called an economizer.
Most of utility boiler’s exhaust gas temperature is higher 20~30ºC than design temperature. Therefore, adding lower temperature economizer at utility boiler can decreasing.
Boiler Economizers Features:
The equipment made of H-type pin tube which has high heat transfer efficiency, compact structure, lower soot formation, and higher exhaust heat gas recovery efficient.
Smoke entrance designed by XIAN Jiaotong University. The smoke uniform enters the equipment case to decreasing anti-attrition.
The bottom of smoke content assembly unit is making by Sulfuric acid resistant steel that increasing the durable years.
There is 800-900mm maintaining space between lower temperature and high temperature transfer tank, which helps reduction become more and more convenience.
The equipment designed by separate modular that let installation and operator become easily and efficient.
Boiler Economizers Advantages:
Reliability. All the design parameter will follow actual operation.
Affordable. The reasonable system design will decrease equipment investment.
prioritization scheme. The boiler system and steam turbine system’s description, we can improve seam turbine’s water in taking and backwater location to increasing exhausts waste gas recovery frequency.
safety. It will keep reasonable control on the metal wall surface temperature and avoid smoke gas dew-point.
The equipment made of H-type pin tube which has high heat transfer efficiency, compact structure, lower soot formation, and higher exhaust heat gas recovery efficient. There is 800-900mm maintaining space between lower temperature and high temperature transfer tank, which helps reduction become more and more convenience. The bottom of smoke content assembly unit is making by Sulfuric acid resistant steel that increasing the durable years. The service life period is more than 10 years.
Boiler exhaust gas is a kind of useful source, therefore, we can use new technology equipment to reduce exhaust gas temperature. Flue gas lost is a part of boiler’s thermosteresis, which is about 5% to 12%. It’s 60% to 70% of the total heat loss. Exhaust gas temperature increase 10ºC will lead to flue gas lost increasing 0.6% to 1.0% and increase 1.2 to 2.4g/kwh coal used.
Reducing exhaust gas temperature has important signification for energy conservation and emission reduction. Installing lower temperature economizer at the end of boiler real smoke channel increase exhaust waste gas recovery, increasing generating capacity,reduce water consumption of desulfurization and protect chimney.
Non-condensing economizers
The most common are non-condensing economizers. They are heat exchanger coils‚ usually finned‚ that are located in the flue gas ducting at the exit of the boiler. Typically‚ a non-condensing economizer will raise the overall efficiency by 2% to 4%. They are designed and operate to maintain the flue gas temperature above the flue gas condensing temperature to prevent corrosion of the flue gas ducting. This is particularly important for fuels containing sulphur‚ as sulphurous compounds will form in the flue gas that will both raise the overall flue gas dewpoint and when condensation occurs will lead to the formation of sulphuric acid‚ which is highly corrosive.
Condensing economizers
Condensing economizers are designed to accommodate the corrosive fluids generated when condensing the moisture out of the flue gas. There are 2 types of condensing economizers: heat exchanger and direct contact (spray). They capture much more heat and therefore can raise the overall boiler efficiency by 10% to 15%. For condensing economizers to be the most effective‚ low temperature heat sinks are required to bring the flue gas temperature well below the flue gas condensing temperature.
The calculations to determine the efficiency of condensing economizers are complex and are not included in this version of the Boiler Efficiency Calculator.