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Device and method for restraining and eliminating dirt of recycled water plate heat exchanger on line

A technology for plate heat exchangers and regenerated water, which is applied in the direction of cleaning heat transfer devices, vibration cleaning, heat exchange equipment, etc., can solve the problems of poor referenceability of cleaning experience and large differences in dirt types, and achieve simple and compact structure, Effect of recovery of flow heat transfer performance of plate heat exchanger and suppression of fouling

Active Publication Date: 2013-04-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the targets of ultrasonic cleaning are mostly crystallized dirt and granular dirt.
In view of the large differences in the types of dirt, the relevant cleaning experience can be used as a reference

Method used

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  • Device and method for restraining and eliminating dirt of recycled water plate heat exchanger on line
  • Device and method for restraining and eliminating dirt of recycled water plate heat exchanger on line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Example of on-line cleaning of urban reclaimed water plate heat exchangers with serious fouling in summer cooling conditions

[0031] A water-source heat pump system that uses the secondary effluent of cities and towns as the cold and heat source, and uses plate heat exchangers to recover the low-level heat energy of the secondary effluent of cities and towns. In summer, the heat pump system operated continuously for 20 days, and the cooling efficiency dropped significantly. After analysis, it was found that the secondary effluent was fouled in the plate heat exchanger. The plate heat exchanger is made of stainless steel 316, and the dirt layer on the surface of the plate is relatively thick, with high viscosity and strong adhesion, and the degree of fouling is very serious. The invention adopts the online cleaning of the plate heat exchanger.

[0032] 1. Cleaning method

[0033] Clean as follows:

[0034] ① The regenerated water enters the water treatment...

Embodiment 2

[0039] Example 2: An example of online cleaning of urban recycled water plate heat exchangers under cooling conditions in summer

[0040] A water-source heat pump system that uses the secondary effluent of cities and towns as the cold and heat source, and uses plate heat exchangers to recover the low-level heat energy of the secondary effluent of cities and towns. In summer, the cooling efficiency of the heat pump system dropped rapidly. According to the analysis, it was caused by the fouling of the secondary outlet water in the plate heat exchanger. The plate heat exchanger was made of stainless steel 304, and the surface of the plate was covered with microbial dirt from bottom to top. Mainly mixed dirt, the degree of fouling is relatively heavy. The invention adopts the online cleaning of the plate heat exchanger.

[0041] 1. Cleaning method

[0042] Clean as follows:

[0043] ① The regenerated water enters the water treatment outer casing through the regenerated water in...

Embodiment 3

[0048] Example 3: An example of on-line cleaning of urban recycled water plate heat exchangers under winter heating conditions

[0049] A water-source heat pump system that uses the secondary effluent of cities and towns as the cold and heat source, and uses plate heat exchangers to recover the low-level heat energy of the secondary effluent of cities and towns. In winter, the heating efficiency of the heat pump system drops, which is caused by scaling of the secondary effluent in the plate heat exchanger after analysis. The plate heat exchanger is made of stainless steel 304, the dirt layer on the high temperature side of the plate surface is thicker, the dirt layer on the low temperature side is thinner, and the degree of fouling is relatively light. The invention adopts the online cleaning of the plate heat exchanger.

[0050] 1. Cleaning method

[0051] Clean as follows:

[0052] ① The regenerated water enters the water treatment outer casing through the regenerated wat...

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Abstract

The invention discloses a device and a method for restraining and eliminating dirt of a recycled water plate heat exchanger on line. The device is characterized by comprising an ultrasonic generator, an ultrasonic transducer, an ultrasonic amplitude transformer and a water treatment outer sleeve, wherein the ultrasonic amplitude transformer is arranged in the water treatment outer sleeve; and oneend of the ultrasonic amplitude transformer is connected with the ultrasonic transducer, and the other end of the ultrasonic amplitude transformer is inserted into a recycled water inlet port of the plate heat exchanger. A method for cleaning the device on line is characterized by comprising the following steps of: firstly, killing microbes in the dirt by using ultrasonic waves with low frequencyand high power, and stripping the dirt; and secondly, eliminating inorganic dirt and residual microbial films by using ultrasonic waves with high frequency and low power. The device and the method are suitable for the plate heat exchanger which uses recycled water as a heat exchange medium, can realize on-line cleaning without influences on the normal operation condition of the heat exchanger, isenvironment-friendly, is easy and convenient to mount, and can make the plate head exchanger operated safely and economically in a long period.

Description

technical field [0001] The invention relates to a device and method for suppressing and removing fouling of a plate heat exchanger, in particular to a device and method for suppressing and removing fouling of a plate heat exchanger using urban reclaimed water as a heat transfer medium by using ultrasonic waves. Background technique [0002] The aggravation of the energy crisis has prompted people to continuously accelerate the development and utilization of renewable energy. Urban reclaimed water contains a large amount of low-level thermal energy. The heat pump technology as a cold and heat source has significant energy-saving and environmental protection benefits. It has been recognized as a renewable energy technology with great application potential. Although urban reclaimed water has been treated in multiple stages by sewage treatment plants and has reached the discharge standard stipulated in the national standard GB18918-2002, its water quality is still relatively com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28F19/00F28G7/00
Inventor 史琳田磊李穹杨倩鹏
Owner TSINGHUA UNIV
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