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First, the technical profile
In the air conditioning equipment, heating pipes, oil pipelines, chemical equipment, power systems, mortar and other industrial processes, the pump power consumption accounted for the main part of the system energy consumption. Therefore, how to minimize pump work is the main means by which these systems reduce energy consumption and increase transportation capacity, and are also important problems that plague enterprises.
In the 1920s, British scientist Tom found that adding certain substances to the liquid can change the flow inside the tube from turbulence to laminar flow, thus greatly reducing the resistance of the conveying pipe. This is the friction drag reduction technology. However, what Tom realizes is the fact that in the 1970s, the United States used this technology for the first time in an oil pipeline from Alaska to its homeland, with the surprising result that it can be delivered with the same oil pump The amount of crude oil increased by 50% or more!
The success of this application has stimulated the academic and engineering research fever on this technology. Unfortunately, the United States added polymers to the pipeline. Due to the long molecular Chain of the polymer, it breaks rapidly under the shear of the pump body, and as a result, the polymer can not be used in a system where multiple cycles are repeated.
For this reason, Japanese research institutes succeeded in developing a new type of drag reducing agent using a surfactant in the late 1990s. The drag reducer not only has a higher drag reduction effect than the polymer, but also, based on the self-healing function of the surfactant, the drag reducer can be reused for a long time in a circulatory flow system. The research results have been widely used in foreign central air conditioning, heating, oil transportation, mortar and other piping systems, and obtained a tremendous energy saving effect.
(a) Normal water (b) After adding drag reducing agent
Figure 1 SSW drag reducing agent shot by a laser particle imager (PIV)
Before and after the tube flow field changes (30ppm, flow rate U = 2m / s)
During his work at the MIIT, Japan, Dr. Wang Weiping conducted a pioneering study on the friction reduction technology using surfactants and successfully developed the Super Smooth Water (SSW) series of friction drag reducers. In this regard, drag-reducing agent in-pipe flow test and environmental test results show that this drag reducing agent has the advantages of wide temperature range, no environmental hazards, the addition of small amount of advantages. In straight pipes, a drag reduction of 70-80% can be obtained; drag reduction of up to 40-60% can be achieved in air-conditioned chilled water systems with a large number of bends and valves (with partial resistance losses). In other words, at the same flow, pump power delivered can be reduced by 40-80%! It can be predicted that the promotion of this technology will bring tremendous energy-saving benefits to the existing central air-conditioning systems, heating pipelines, oil pipelines, chemical equipment, power systems and mortar transportation.
Figure 2 after adding drag-reducing pump energy saving
Second, SSW series drag reducer advantages
1, the application of a wide temperature range. In the range of -20 ~ 80 degrees have the same drag reduction effect.
2, the applicable flow rate range. In the U <5.0m / s pipeline can be used, and the actual pipeline system, in most cases the flow rate of less than 2.0m / s.
3, without any environmental hazards. Tested by Japanese research institutes, the DRA fish toxicity test, algal growth retardation, activated sludge respiratory disorder, organic decomposition disorders, and biodegradability meet the most stringent Japanese national standards and can therefore be directly discharged.
4, add a small amount. Only need to add a few thousandths get 40-80% drag reduction effect.
Third, the application conditions
(1) The temperature of the delivered fluid is between -20 and 80 ° C. Drag-reducing agent at this temperature will lose drag reduction effect.
(2) Fluid flow rate U <5.0 m / s.
(3) the fluid being transported and the surfactant does not react chemically.
Fourth, the scope of application
1, heating equipment. Mainly the temperature is not higher than 80 degrees closed loop hot water heater system.
2, central air conditioning equipment. Including the transformation of existing air-conditioning, or the new air-conditioning optimization design (to reduce the design of pump work).
3, heat exchanger. For example, power plants, steel mills, chemical plants and other large-scale heat transfer equipment.
4, oil pipeline. Including crude oil pipelines and oil and gas transmission pipeline.
5, chemical engineering. Various inorganic liquid transport process.
6, slurry delivery. Such as the delivery of mortar from thermal power plants, and the delivery of other sludges.
7, other places need liquid delivery
Five, SSW series DRA usage and dosage
(1) Usage: Dissolve the DRA in a small amount of water and stir until it melts evenly. Then slowly inject it into the pipe and mix it evenly with the water in the pipe. Note that the injection speed can not be too fast, otherwise it will cause sudden changes in traffic.
(2) dosage: 1m 3 liquid add this drag reducing agent about 3kg.
SSW super-slip waterway friction drag reducing agent is a kind of energy-saving technology with less investment, broad market prospect and remarkable energy-saving effect. It only needs to add 0.3% SSW super-slip water friction friction reducer in the circulating fluid system, There are any changes for the liquid system, you can achieve significant energy savings of 20% to 30% of the results. The most direct application is the northern heating system, and air-conditioning cooling water system and chilled water system by adding SSW super-friction waterway friction drag reducer, which can greatly reduce the pump power to improve water circulation system to achieve pump energy saving 20% ​​to 30% Effect.