Feed water heater of boiler

A feedwater heater and feedwater heating technology, which is used in feedwater heaters, lighting and heating equipment, preheating, etc., can solve the problems of low boiler exhaust gas temperature, easy to cause low temperature corrosion, and ineffective flue gas purification system.

Inactive Publication Date: 2011-05-04
WUXI HUAGUANG BOILER
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  • Abstract
  • Description
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Problems solved by technology

[0003] Existing waste heat boilers have high exhaust gas temperature under rated operating conditions, so the metal wall temperature of the final economizer is still higher than the flue gas dew point temperature; however, when the boiler is started and the boiler is operating at low load, the boiler exhaust gas temperature is usually Lower, so that the metal wall temperature of the final economizer of the boiler is lower than the flue gas dew point temperature, which is more likely to cause low-temperature corrosion, so that the next-level flue gas purification system cannot play its due role

Method used

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Embodiment Construction

[0011] See figure 1 , which includes a drum 1, a final stage economizer 2, a feedwater heating pipe 3 is installed in the steam space of the drum 1, the outlet of the feedwater heating pipe 3 leads to the inlet header 4 of the final stage economizer 2, and the feedwater heating pipe The water inlet of 3 is externally connected with the main water supply pipeline 6. The water inlet of the main water supply pipeline 6 is connected to the inlet 8 of the electric water supply three-way regulating valve 7, and the two outlets 9 and 10 of the electric water supply three-way regulating valve 7 are respectively connected to the water inlet of the water supply heating pipe 3 and the water supply mixing tank 5, The outlet of the feedwater heating pipe 3 leads to the feedwater mixing tank 5, and the outlet end of the feedwater mixing tank 5 leads to the inlet header 4 of the final stage economizer 2, and a thermocouple 11 is installed at the outlet end of the feedwater mixing tank 5; Th...

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Abstract

The invention provides a feed water heater of a boiler. The feed water heater allows the temperature of the metal wall of the final-stage coal economizer of the boiler to be higher than the dew point temperature of the flue gas, prevents low temperature corrosion and ensures that the flue gas can enter into the next stage flue gas evolution system. According to the technical scheme of the invention, the feed water heater comprises a boiler barrel and a final-stage coal economizer. The feed water heater of boiler is characterized in that a feed water heating pipe is positioned in the steam space of the boiler barrel; the outlet of the feed water heating pipe leads to the inlet collection box of the final-stage coal economizer; and the water inlet of the feed water heating pipe is externally connected with a main feed water pipe.

Description

technical field [0001] The invention relates to the mechanical structure field of waste heat boilers, in particular to a boiler feed water heater. Background technique [0002] Because the flue gas produced by the waste heat boiler incineration of domestic waste contains a lot of HCl, SO 2 , SO 3 , HF and other harmful substances, it is necessary to prevent low-temperature corrosion of the economizer. When low-temperature corrosion occurs, it is generally located in the last-stage economizer. At this time, the metal wall temperature of the final-stage economizer is lower than the flue gas dew point temperature. The metal wall temperature of the coal burner is related to the exhaust gas temperature and the internal medium temperature. [0003] Existing waste heat boilers have high exhaust gas temperature under rated operating conditions, so the metal wall temperature of the final economizer is still higher than the flue gas dew point temperature; however, when the boile...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/18
Inventor 丁虹王政毛军华
Owner WUXI HUAGUANG BOILER
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