Dew point corrosion resistant method for flue gas heat exchanger

A flue gas heat exchanger and pitting corrosion technology, which is applied in the direction of damage protection, heat exchange equipment, lighting and heating equipment, etc., can solve the problems of limited effect and difficult to adjust and control the heat exchange tube wall, and achieve Large waste heat recovery effect, avoid dew point corrosion, large steam flow effect

Active Publication Date: 2012-11-28
熊泽宇
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Problems solved by technology

At present, there are two main ways to solve dew point corrosion. One is to use anti-dew point corrosion materials, but its effect is limited; the other is to avoid dew point corrosion, that is, to control the temperature of the heat exchange tube wall that exchanges heat with the flue gas. Make it always higher than the dew point problem, but in the actual operation process, the problem of the heat exchange tube wall is difficult to be adjustable and controllable

Method used

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  • Dew point corrosion resistant method for flue gas heat exchanger
  • Dew point corrosion resistant method for flue gas heat exchanger

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Embodiment Construction

[0028] Such as figure 2 As shown, in the prior art (see figure 1 ) on the basis of the steam riser of the two-phase flow heat exchanger, a steam flow regulating valve 5 and a temperature measurement or temperature measurement and control device 7 are set so that the steam flow and pressure can be controlled manually or automatically. During manual control, the steam flow regulating valve 5 can be various regulating valves such as manual, pneumatic, hydraulic, electromagnetic, etc., and the device 7 can be a simple temperature measuring instrument. During automatic control, the steam flow regulating valve 5 is a pneumatic, hydraulic, electromagnetic and other regulating valves that can accept control signals, and the temperature measurement and control device 7 can be a single element with both temperature measurement and temperature control functions, or it can be a temperature measurement Combination of elements and temperature control elements.

[0029] When in the prefer...

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Abstract

The invention discloses a dew point corrosion resistant method for a flue gas heat exchanger. The method preferably comprises the following steps: 1) a flow rate regulating valve and a temperature measuring and controlling device which can receive control signals are arranged on a steam pipeline; and 2) the flow rate regulating valve receives the control signals of the temperature measuring and controlling device, and regulates the aperture automatically, so that the steam temperature is kept above the preset temperature which is higher than the dew point temperature of flue gas. Through the dew point corrosion resistant method for the flue gas heat exchanger, the temperature of a heat exchange pipe wall which exchanges heat with flue gas is always higher than the dew point temperature, and the dew point corrosion is avoided; and the dew point corrosion is avoided, and a higher steam flow rate and a residual heat recycling effect are obtained.

Description

technical field [0001] The invention relates to the field of anticorrosion of heat exchangers, in particular to a method for preventing dew point corrosion of flue gas heat exchangers. Background technique [0002] In chemical, metallurgical and other enterprises, industrial furnaces such as heating furnaces and boilers often consume a large amount of fuel and are important energy-consuming equipment. Therefore, recovering the waste heat in the flue gas produced by fuel combustion has become the focus of energy saving and consumption reduction for these enterprises. The application of air preheater is a commonly used waste heat recovery technology. Air preheater is generally referred to as air preheater. The heat exchange recovers the waste heat in the flue gas and uses it to preheat the air before entering the industrial furnace, thereby improving the thermal efficiency of the industrial furnace and reducing its fuel consumption. [0003] Currently commonly used air prehea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28F19/00
Inventor 熊泽宇
Owner 熊泽宇
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