Decanter

Decanter คือ เครื่องแยกกากชนิดที่ ตัวแกนอยู่ในแนวนอน ปกติสามารถสามารถแยกการที่มีเปอร์เซนของแข็งที่ประมาณ 30 % ขึ้นไปให้เหลือกากของแข็งที่ประมาณ 3 % การทำงานคือตัว product (ที่มีน้ำและของแข็ง)จะถูก Feed เข้าที่ด้านหน้า ตัว ฺBowl จะหมุนด้วยความเร็วรอบที่สูง โดยมี scroll หมุนด้วยความเร็วที่ต่างกันเล็กน้อยประมาณ 30 rpm เครื่องจักรของ HAUS จะมีตัวปรับ speed อัตโนมัตขึ้นอยู่กับปริมาณ Solid content, Product ที่มีของเหลวและของแข็งที่ป้อนเข้าเครื่องจะถูกเร่งด้วยความเร็วรอบทีสูงขึ้น ของแข็งจะถูกแรงเหวี่ยงที่สูงวิ่งไปที่ผนังด้านนอกของ Bowl และถูก scroll ปาดออกไปที่ conical part และถูกดันออกด้านหน้า ส่วนของเหลวจะถูกผลักไปด้านหลัง ุ HAUS มี technology ของ decanter ที่แยกน้ำมันและน้ำออกจากกันด้วย ข้อดีของ HAUS ก็คือวัสดุที่ใช้ทำ Bowl ทำจาก Alloy ซึ่งมีความคงทนที่สูงมากกว่า stainless 316 หลายเท่า นอกจากนี้ด้วย technology ของการ alignment และประสิทธิภาพของ motor และ gear box ที่สูงทำให้ Decanter ของ HAUS สร้าง centrifugal force ได้สูงเทียบเท่ากับเครื่องจักรยี่ห้อชั้นน้ำของโลก เพื่อเพิ่มความแข็ง เซ

รามิกได้

A centrifuge decanter; consists of a solid cylindrical bowl rotating at high speed, a scroll  rotating at the same axis with a slightly different speed, a drive group adjusting the speed difference and the body which carries all the rotating elements.

Liquid and suspended solids are fed along the center line to a distribution room within the bowl and then accelerated into the bowl by centrifugal force  through the feeding point. This centrifugal force then causes the suspended solids to settle and accumulate at the bowl wall.       

Sludge cake  is discharged  by scroll from the conical part meanwhile clarified liquid  flows back along the bowl and is discharged through the cylindrical end of the bowl by plates which can adjust the level of clarified liquid.

Centrifuge decanters are applied for separation of liquid mixtures, separation of solid-liquid mixtures, dewatering, thickening, classification of solid-liquid mixtures and extraction of components.

The bowl is consisted of two parts: cylindircal and conic Suspension rotates at processing speed along with the bowl and forms a concentric layer at bowl perimeter. Solids available in the suspension accumulate at bowl perimeter with centrifugal force. The length of the cylindrical section of the bowl and the conic section angle are adjusted as per the specific condition of each application. Scroll Group Scroll rotates at a slightly different speed than the bowl and conveys the accumulated solids to the end of the conic section of the bowl. If the physical properties of the mixture change, it is possible to support HAUS decanters with a different scroll design or by modifying the existing scroll. Scroll step or single or dual wound scroll configurations are significant design variables.

Material HAUS uses high quality stainless steel on all surfaces that the the product comes in contact with. Wear Protection HAUS decanters offer a wide range of wear protection options to be applied on many areas where they are utilized:   Tungsten Carbide coating with plasma spray   Ceramic   Sintered Tungsten Carbide plates   Polyurethane Wear protection parts are in-place replaceable in order to save on maintenance costs of applications where high abrasive products are processed.

Bearing and Lubrication Special selection and order of bearings ensure long machinery life and exceptional reliability. Central lubrication system delivers grease or oil to the bearings. The lubrication system changes depending on the operation mode, e.g. sectional or continuous operation mode and depending on the automation level of the whole system. Leveling Plates Treated liquids flow over the leveling plates and move forward to the end of the cylindrical section of the bowl of which they’ll be delivered to. Easily adjustable sensitive leveling plates enable the pool depth of the bowl to be adjusted precisely. The liquid overflowing from the plates is extracted with gravity from central outlet reservoir.

Drive System

HAUS applies advanced engineering techniques to accelerate the decanters to high speeds in safe. One of the most important key factor for decanters is the differential speed. Differential speed determines the amount of moisture hold in the separated solids and the clarity of the centrate. This speed can be adjusted according to the required product characteristics. Drive systems which run to determine this speed are given as below: 

-  Constant Speed Drive System This system has low investment costs due to very simple design. This drive system is used when the solids amount is constant, the solids can be conveyed easily and the amount of moisture in the solids is not critical, which means it is not necessary to adjust the differential speed. 

-  Dual Drive System Dual Drive  provides differential speed to be adjusted in a wide range. Second motor drives the gearbox input shaft and makes the differential speed as a function of bowl speed and gearbox rate. Required speed is adjusted when the solids amount is variable noticeably, it is hard to convey the solids and it is important to minimize the amount of water hold in the solids without any human interference. Differential speed is adjusted automatically and very precisely as a function of scroll torque. The system is supported by the software developed by HAUS. 

-  Semi - Driver System with Hydraulic Motor Instead of a mechanical gear, a rotating hydraulic drive is assembled and this motor is supported with hydraulic regulation. Automatic regulation can be done with no problem because the differential speed is directly proportional with the amount of the oil transmitted. Driver system with hydraulic motor is used when the solids amount is variable, it is hard to convey the solids and it is important to minimize the amount of water left in the solids.

CONTROL AND  AUTOMATION

Automation of HAUS decanters enables  fully automatic operation. 

 In addition to the operating variables of the decanter, below functions can be also monitored from main control room:   

Bearing and lubrication temperature   

Bearing and main structure vibration   

Gear torque or the control of differential speed with respect to torque   

Leakage control for isolated systems   

Turbidity control for centrate monitoring    

Feeding pump flow   

Chemical make-up unit control   

Flowmeter   

Conveyor control