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Composite anti-corrosion heat-exchanger by using flue gas to condense thermal energy

A technology of heat exchange device and flue gas condensation, which is applied in the direction of coating, etc., can solve the problems of abnormal operation of equipment systems, limitations of adaptability and economy, poor thermal conductivity of materials, etc., and achieve excellent heat transfer performance and practicability And economical improvement, the effect of compact structure

Active Publication Date: 2009-04-08
北京建筑工程学院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of heat exchange equipment is difficult to process, high in cost, and the poor thermal conductivity of the material is not conducive to the compactness of the equipment. It takes up a lot of space in the application, and the resistance of the flue gas is so large that the equipment system cannot operate normally.
At the same time, the structure concept is single, and this type of heat exchange equipment cannot be separately set up and the overall structure optimized according to changes in the temperature environment and corrosion environment, which limits the adaptability and economy of this type of product at present.

Method used

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  • Composite anti-corrosion heat-exchanger by using flue gas to condense thermal energy
  • Composite anti-corrosion heat-exchanger by using flue gas to condense thermal energy
  • Composite anti-corrosion heat-exchanger by using flue gas to condense thermal energy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: The high-temperature heat exchange section 1 adopts stainless steel-aluminum composite tubes and aluminum alloy fins. The finned base pipe and fins of the low temperature heat exchange section 2 are made of red copper, the finned base pipe is a round tube, and the fins are provided with triangular pressure equalization holes; the upper and lower edges of the fins are arc-shaped, and the upper edge of the fins is arc-shaped The arc is gentler than the lower edge, and the height of the upper fins of the fin base tube is lower than that of the lower fins. Both the outer surface of the fin base tube and the surface of the fin are coated with an amorphous nickel-copper-phosphorus chemical composite coating with sodium molybdate as a stabilizer, and then coated with a fluororesin organic coating. The thickness of the chemical coating is 20 μm, the thickness of the organic coating is 20 μm, and the durability is 8 years.

Embodiment 2

[0032]Example 2: The heat exchange section 1 adopts stainless steel-aluminum composite tubes and aluminum alloy fins. The finned base tube and fins of heat exchange section 2 are made of red copper, the finned base tube is an oval tube, and the fins are provided with triangular pressure equalization holes; the upper and lower edges of the fins are arc-shaped, and the arc ratio of the upper edge of the fins is The arc of the lower edge is gentle, and the height of the upper fins of the fin base tube is lower than that of the lower fins. Both the outer surface of the fin base tube and the fin surface are coated with an amorphous nickel-copper-phosphorus chemical composite coating with sodium molybdate as a stabilizer, and then coated with a fluorocarbon resin organic coating. The thickness of the electroless coating is 30 μm, the thickness of the organic coating is 30 μm, and the durability is 10 years.

Embodiment 3

[0033] Example 3: The heat exchange section 1 adopts stainless steel-aluminum composite tubes and aluminum alloy fins. The finned base tube and fins of heat exchange section 2 are made of red copper, the finned base tube is an oval tube, and the fins are provided with circular pressure equalization holes; the upper and lower edges of the fins are arc-shaped, and the upper edge of the fins is arc-shaped The arc is gentler than the lower edge, and the height of the upper fins of the fin base tube is lower than that of the lower fins. An amorphous nickel-copper-phosphorus chemical composite coating with sodium molybdate as a stabilizer is plated on the outer surface of the fin base tube and the fin surface, and then coated with a polyurethane organic coating. The thickness of the electroless coating is 30 μm, the thickness of the organic coating is 30 μm, and the durability is 10 years.

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Abstract

An integrated anticorrosion heat exchange installation which utilizes flue gas to condense heat energy belongs to the technical field of heat and mass transfer enhancement and metal anticorrosion. The installation comprises two finned tube heat transfer sections which are made of different materials of the high-temperature heat transfer section and the low-temperature heat transfer section. The high-temperature heat transfer section adopts a stainless steel-aluminum compound pipe aluminum alloy fin and the low-temperature heat transfer section adopts a copper ribbed tube coated with composite anticorrosive coating. The shape of the rib of low-temperature heat transfer section and balanced holes on the rib are beneficial to homogeneous flow of flue gas and discharging of condensed fluid. The finned base tube of the low-temperature heat transfer section and the fin surface are both plated with non-crystalline Ni-Cu-P chemical coating taking sodium molybdate as stabilizer and organic coatings. The installation has the advantages of good heat transfer performance, small flow resistance, temperature resistance, anticorrosion, compact structure and strong adaptability, is easy to be processed and combined, can be used for natural gas utilization facilities such as gas boilers, direct-fired units, and the like for recovery of flue gas heat energy. and can also used for condensation heat exchangers of condensing natural gas utilization facilities such as condensing natural gas boilers, direct-fired units, and the like.

Description

technical field [0001] The invention relates to a heat exchange device for recovering and utilizing flue gas condensation heat energy of natural gas utilization equipment such as a natural gas boiler or a gas direct combustion engine, and a condensing heat exchanger for condensing natural gas utilization equipment such as a condensing natural gas boiler or a gas direct combustion engine. In particular, it relates to a composite anti-corrosion heat exchange device utilizing flue gas condensation heat energy and a manufacturing method thereof, and belongs to the technical field of heat and mass transfer enhancement and metal anti-corrosion. Background technique [0002] At present, the exhaust gas temperature of ordinary natural gas boilers and direct-fired turbines and other natural gas utilization equipment is above 100°C, resulting in energy waste and environmental pollution, and their thermal efficiency is generally lower than 90%. [0003] A flue gas condensation heat exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F19/02
Inventor 王随林刘贵昌潘树源史永征闫全英傅忠诚艾效逸郭全徐鹏
Owner 北京建筑工程学院
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