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结垢对螺旋板换热器的影响及处理办法?
发布时间:2018-09-25 16:25:14 发布人:admin

换热器设备的种类很多,但不管是哪种类型的换热器,在运行一段时间后,在换热器内外壁上粘附一层白色水垢。水垢形成的主要原因是由于水中含有溶解度较小的钙、镁盐类,这种盐类有共同特性,其溶解度随着水温升高而下降,且变成难容的盐类。
There are many kinds of heat exchanger equipment, but no matter what type of heat exchanger, after running for a period of time, a layer of white fouling adheres to the inner and outer walls of the heat exchanger. The main reason for scale formation is that there are less soluble calcium and magnesium salts in the water. These salts have the same characteristics. Their solubility decreases with the increase of water temperature and become difficult salt.
换热器结垢后对于设备的影响:
The influence of scale after heat exchanger on equipment:
一、水垢附在传热面上,难于清除,增加了检修费用,不仅耗费人力、物力,而且会使受热面受到损伤,降低换热器寿命。
1. Scale attached to the heat transfer surface is difficult to remove, which increases the overhaul costs. It not only consumes manpower and material resources, but also damages the heating surface and reduces the life of the heat exchanger.
二、水垢产生后,会减小传热面内外流通截面,增加了传热面内外循环水的流通阻力,严重时流通截面很小,甚至完全被堵塞,就会使换热器不能正常运行。
Secondly, the scale will reduce the flow cross-section inside and outside the heat transfer surface and increase the flow resistance of circulating water inside and outside the heat transfer surface. If the flow cross-section is very small, or even completely blocked, the heat exchanger will not work properly.
三、水垢导热性能很差,它比钢铁导热能力小30~50倍,有水垢存在就会使受热面传热变坏,因而`使传热面不能达到理想的温度降。根据有关资料介绍,经实验,产生1mm厚的水垢,换热器将会下降10%左右效率。
3. Scale has poor thermal conductivity, which is 30-50 times less than that of iron and steel. The existence of scale will deteriorate the heat transfer on the heating surface, so that the heat transfer surface can not reach the desired temperature drop. According to the relevant information, the heat exchanger will reduce efficiency by about 10% after the experiment, which produces 1 mm thick scale.

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换热器结垢的处理方法:
Treatment of fouling in heat exchanger:
1.加药软化处理。加药软化处理,具有方法简单、效率高、经济性好和不需要专门的制水设备等特点,是一种实用性很强的防垢水处理方法。根据加药的方法不同,分校正剂处理和防垢处理两种。
1. add medicine softening treatment. Softening treatment by adding medicine is a kind of practical anti-fouling water treatment method with the characteristics of simple method, high efficiency, good economy and no special water-making equipment. According to different dosing methods, there are two kinds of positive treatment and anti scaling treatment.
2.离子棒防垢水处理。离子棒防垢水处理是一种新兴、先进的水处理设备。在热水循环系统、中央空调系统、循环冷却水系统中应用,均取得满意的防垢效果,是很有发展前途的新型水处理设备,尤其在换热器上应用,效果将更为显著。
2. ion rod scale water treatment. Anti scaling treatment of ionic rods is a new and advanced water treatment equipment. It has been applied in hot water circulation system, central air conditioning system and circulating cooling water system with satisfactory scale prevention effect. It is a promising new water treatment equipment, especially in heat exchanger, and the effect will be more remarkable.
3.磁化防垢处理。磁化防垢处理原理是利用水分子具有的极性,即水分子是共价化合。当水流通过高强度的磁场之后,水中的多分子缔合体和离子磁场的作用,原来单散的多离子组成的缔合体被拆散为单个的或短键的缔合体,它们以一定的速度垂直切割外界磁场的磁力线而产生感应电流。因此,每个离子按与外界磁场同方向建立新的磁场,相邻的带极性的离子分子,就有秩序地相互压缩和吸引,从而导致结晶条件的改变,形成的结晶物很松弛,抗压、抗拉能力差,并且很脆,其粘结力和附着力也很弱,它们不易附着在受热面上形成水垢。
3. magnetization and scale prevention. The principle of magnetization and scale prevention is to make use of the polarity of water molecules, that is, water molecules are covalently bonded. When water flows through a high-intensity magnetic field, the interaction between the multimolecular associations and the ionic magnetic field in the water, the associations formed by the original single ions are split into single or short-bonded associations, which cut the magnetic field lines vertically at a certain speed to generate induced current. Therefore, each ion establishes a new magnetic field in the same direction as the external magnetic field, and the adjacent polar ion molecules compress and attract each other orderly, resulting in the change of crystallization conditions. The crystals formed are very relaxed, poor in compression and tensile strength, and very brittle, and their adhesion and adhesion are weak, and they do not. It is easy to deposit on the heating surface to form scale.
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