Feiyiya Inclined Plate Clarifiers Use Gravity & Innovative Engineering
A gravity clarifier is the most economical method of removing solids from liquids, using natural gravity as the source of energy and it is free. A clarifier simply provides a non-turbulent zone where heavier than liquid solids, suspended by turbulence, are given sufficient time to settle to a quiescent surface. The HEI inclined plate clarifiers are compact units with multiple layers of settling area utilizing less than 25% of the floor space required by conventional clarifiers.
Principle of Clarifiers
A particle carried forward by the velocity of the liquid flow must settle at a rate that allows it to reach the bottom before passing through the clarifer. Thus, particles beginning at a point [a" must traverse some route lying between ab and ab` in order to avoid being carried over the outlet.
If V is the horizontal velocity of the liquid, S the solids particle vertical settling velocity, L the length of the settling device, and D its depth, then particles entering at point A will settle to the bottom of the device only if V does not exceed: S(L/D)Since Vmax / S = L / D then, Vmax = S (L / D)
Inclined plate clarifier, Lanmei inclined plate clarifier, Inclined Tube Settler,High-Efficiency Inclined Tube Wuxi Feiyiya Environmental Protection Technology Co., Ltd. , https://www.feiyya.com
Huang Gang, general manager of Dongfeng Commercial Vehicle Co., Ltd., insists on the independence of Dongfeng and Volvo. He recently told reporters that after the Dongfeng Volvo joint venture was established, Dongfeng will not import any Volvo vehicle platform. Dongfeng still produces only its own. Models, hanging Dongfeng "Shuangfeiyan" standard.
Working with Volvo just learn from each other
On January 26 this year, Dongfeng Motor Group Co., Ltd. and Volvo formally signed an agreement to establish a strategic alliance to jointly develop the Dongfeng brand commercial vehicles.
The outside world has always questioned why Dongfeng Commercial Vehicles, which have core technologies and high domestic market share, have worked hard and have waited for 8 years to establish a joint venture with Volvo. In response, Huang Gang gave the answer. One is Dongfeng Commercial Vehicle. The internationalization strategy needs to use Volvo to open the market. Second, Dongfeng must learn from Volvo and improve its core competitiveness.
Huang Gang said that global cooperation is a general trend. Dongfeng's cooperation with Volvo is based on the global strategic cooperation between the two groups. Although Dongfeng has done a good job in China, it lacks the experience of global development. Even in the most recent Southeast Asia region, the development of Dongfeng Commercial Vehicles is not as good as in Europe and America, and the global market share is very low. "Dongfeng needs autonomy, but at the same time it does not rule out cooperation. Our cooperation with Volvo is not abandoning China's resources and markets, but for global development," Huang Gang said. On the other hand, Volvo has developed in Europe, Africa, and the Americas. It is very good, but the Asia-Pacific region, especially China, is still weak. Volvo also needs Dongfeng’s support. We all help each other.
Secondly, though Dongfeng is a self-confident and self-improving enterprise, there is still a lot of room for improvement. In the process of international cooperation and on the premise of maintaining autonomy, we must learn from others and both sides support each other. In turn, Volvo also needs to learn from Dongfeng. Both parties have the resources to learn from each other and further strengthen their core competitiveness. "Of course, Dongfeng always insists on its own brand and will not import any of Volvo's models. From the partnership ratio of 55::45, it can also be seen that Dongfeng only uses Volvo's technology for its own use as its own model. Dongfeng's products are continuously upgraded to meet the needs of the international market.
The biggest difficulty in entering overseas is business philosophy
Huang Gang believes that the challenges faced by domestic commercial vehicle brand exports are not cost, nor are they products, but rather Chinese companies lack globalization experience. The foreign business model and marketing model are very different from the Chinese market, so the biggest challenge to go out is the business philosophy, which means “There is no problem in doing so in China, but it will not work in foreign countriesâ€.
Taking products as an example, the price of Dongfeng commercial vehicles is currently very competitive in Southeast Asia, but the requirements of users are not just good-looking products, low prices, but after-sales services. China’s truck users are all individual users. They will not find manufacturers to repair their own but they will digest themselves or find roadside shops to repair. However, in foreign countries, selling cars not only sells products, but also sells services. Users sign five with manufacturers. The service agreement for the year will require manufacturers to find a problem once the car is in trouble. This is a big challenge for domestic car companies. In addition, foreigners are accustomed to using European cars. They have high quality and safety requirements. If Chinese cars can't meet their travel rates and service requirements, they may well confuse the Chinese car brand. "Knowing that Chinese companies do not go out to represent a certain brand, but they represent MADEINCHINA. Once a problem arises, the entire Chinese brand car is over. Our jeans are so out of the overseas market."
Another difficulty in going out is the vicious competition within China's entire truck industry. Chinese car companies flocked to overseas, fought for each other's prices, lost all their money, and couldn’t hold themselves back, eventually destroying Chinese brands. "Vicious domestic competition is a very big problem when it comes to overseas. It is difficult to rely on one company to make corrections. It must rely on industry self-discipline, rely on government departments to guide coordination, agree on fair competition rules, and protect the development of the entire Chinese brand abroad." According to Huang Gang, due to global economic and political influence, the export volume of Dongfeng commercial vehicles this year can only achieve 7,000 vehicles.
In the face of the micro-growth of the commercial vehicle industry, Huang Gang believes that China's commercial vehicles must accelerate the pace of globalization and balance the two markets at home and abroad. Through internationalization, we have improved our capabilities and levels so that our products meet the needs of foreign markets. What is more important is to improve the quality of operations, strengthen business transformation, refine production, improve product quality, and allow customers to earn more money from your products.
Therefore, the velocity at which a horizontal clarifying device may be operated successfully is directly proportional to its length and inversely proportional to its depth.
This analysis applies to multiple horizontal plate units also. The spacing between plates is usually a few inches as opposed to a depth of several feet in a horizontal tank; therefore, [settling-out" times are dramatically reduced. The flow must be non-turbulent to prevent settled solids from being re-entrained within the moving liquid. Small plate spacing and a large surface area permits laminar flow at higher velocities than large horizontal tanks would allow.
Horizontal clarifying devices become self-flushing if they are inclined at an angle which exceeds the angle of repose of the settled solids. In such cases, flow enters the lower end of the device where settling particles move to the floor eventually sliding back out the entrance. Clear effluent leaves the top of the device.
However, when the device is inclined, the furthest settling particles no longer fall through distance D but some longer distance D`. This new longer settling distance D` is related to D by the relation: D = D` cos Ø.
Theta [Ø" is the angle, the device is inclined to the horizontal plane. Thus settling distance is increased by the factor: 1/cos Ø In the case where Ø = 60º, 1/cos Ø = 2.
The maximum settling distance is twice the distance between the plates. It is apparent then that the lower the angle of inclination, the smaller the settling distance. However, the angle of inclination must exceed the angle of repose of the solids to be separated. The previous equation may be modified to express the cosine of an inclined plate clarifying system as:
Vmax = L / (D / cosØ) (s) = L·cosØ / D (s)
Inclined Plate Clarifiers
A reduction of the required floor space is acquired by diminishing the separation between the horizontal plates to a few inches and stacking the settling surfaces. Inclining the plates to provide self flushing, 45º for heavy particles and 60º for light particles, reduces the available horizontal projected area (effective settling area) by a factor equivalent to the cosine of the angle. The surface area diagram (below) graphically compares the floor space requirements of an HEI inclined plate clarifier with the equivalent horizontal projected settling area.
Settling Rate
The settling rate for a specific solids should be determined by standard laboratory tests. Light particles, such as metal hydroxides, usually require a design parameter of 0.25 – 0.50 gallons per minute per square foot of horizontal projected area. These low density solids require the inclined plates to be set at a 60º angle to induce the particles to slide down the plate. Heavier particles (such as sand that easily flow) will readily slide from plates set at a 45º angle.
Maximum flow rate of an inclined plate clarifier is based on the flow rate per unit of a horizontally projected surface area. Retention time in the clarifier is not a design criteria. However, attaining optimum performance requires the prudent design to recognize several additional, very important factors.
Huang Gang: Dongfeng will not import any Volvo platform