SA213 T11 Alloy Steel Boiler Economizer for Heat Recovery and Feed Water Preheating

SA213 T11 Alloy Steel Boiler Economizer for Heat Recovery and Feed Water Preheating​

Summary

          Economizer is a device installed in the lower part of the flue at the tail of the boiler for recovering the waste heat of the exhaust gas, heating the boiler feed water into the heating surface of the saturated water under the pressure of the steam drum, because it absorbs the heat of the high-temperature flue gas, reduces the exhaust temperature of the flue gas, saves energy and improves the efficiency, so it is called the economizer. The steel tube economizer is not limited by pressure and it can be used as a boiling type, which is generally made of carbon steel pipe with an outer diameter of 32~51 mm. Sometimes fins and ribs are added to the tube to improve heat transfer. The steel tube economizer consists of a horizontal arrangement of parallel elbow pipes (commonly known as serpentine pipes).

Function

1. Absorb the heat of low-temperature flue gas, reduce the exhaust temperature, reduce the exhaust loss, and save fuel.

2. Because the feed water is heated in the economizer before entering the steam drum, the heat absorption of the feed water on the heating surface is reduced, and the economizer can be used to replace part of the evaporation heating surface with high cost.

3. When the feed water temperature increases, the wall temperature difference will be reduced when it enters the steam drum, and the thermal stress will be reduced accordingly, prolonging the service life of the steam drum.

Energy-saving principle

        Add a reheating process to the cycle. Increase the average temperature of endothermy. This increases the efficiency of the cycle. During the start-up process of the boiler (drum boiler), because the circulation of its steam-water pipeline is not established, that is, the boiler feed water is in a stagnant state, and the water in the economizer is in a state of non-flow at this time. With the strengthening of boiler combustion and the increase of flue gas temperature, the water in the economizer is easy to vaporize, so that the part of the economizer is in an overtemperature state. In order to avoid this situation, a pipe is connected from the centralized sewer pipe of the steam drum to the inlet of the economizer as a recirculation pipe, so that the water in the economizer is in a flowing state to avoid its vaporization.

Specifications

Quality Control

1. Impact test and Strength calculation report with applied materials information.

2. 100% NDT(non-destructive inspection) report of steel plate, tube and electrode

3. X-ray, γ-ray and liquid penetrant test inspection report (welding seam): to ensure the quality of the entire boiler

4. Hydraulic test report: ensure the standard working pressure and safety

About us

        Hua Dong Boiler Co., Ltd. is a high-tech enterprise specialized in manufacturing boilers. Established in early 1985s, has two manufacturing bases, this company covers 400,000 ㎡ with fixed assets amounting to USD 110,000,000. There are 1100 employees including 150 technicians and 600 coded welders. Hua Dong holds the manufacturing licenses for Grade A boilers and Grade A1&A2 pressure vessels issued by Chinese General Administration of Quality Supervision, Inspection and Quarantine; also it holds the "S" and "U" "NB" stamps issued by American Society of Mechanical Engineers; meanwhile, this Company has passed the certification of ISO9001, SO3834, EN12952 Quality Management System.