Bintec - Smart Grain Handling System
The Bintec system basically consists of silos which are filled with mobile conveyor system. The silos are equipped with full aeration floors and allow the drying of wet harvested goods. Through a monitoring and control system of the drying process is controlled and subsequent safe storage without loss of quality guaranteed. The extraction is carried out via a trough and Fegeschnecken unit directly into the mobile conveyor system and the removal vehicle.
To use come either tube or pipe screw conveyors. The latter more likely if the operation must firstly absolutely encourage varietal want, secondly, to promote (eg seed producer) very gently, so as not to damage the crop (eg. Legumes) or thirdly, no tractor available is capable of driving the most of PTO-driven auger.
If none of these reasons to, usually comes a screw to use as they require less maintenance and is cheaper with comparable capacity. There are also screw conveyors with electric drive, but only up to a length of almost 19 m and a capacity of 90 t / h. They play in the filling of silos only a subordinate role and therefore disregarded in the following. The majority of mobile worm has flow rates of 150, 240 or 300 t / h, is driven by the PTO and is 18.30 to 33.50 m long. They usually have a pivotal assumption snail, which is why they are called Swingaway worm.
The pipe conveyors are available in various performance classes from 80 t / h, which also applies here that for the filling of silo capacities of 150 and 300 t / h are used. Through a separate supply belt a pivotable assumption can also be implemented here. For simplicity, the speech should be in addition only of Swingaway worm.
Operation of Swingaway technique.
The crop is tipped directly into the hopper of the hinged feed screw from the transport vehicle. Since this must be controlled, is mostly discharged via a slide in the back of the dump truck. Lateral tipping is not possible. The grain is overloaded by the feeding screw into the main screw and then conveyed through the open manhole cover in the roof centered in the silo. The so-called Supercharge principle of filling level is optimized in the main screw and thus the emergence of broken grains largely avoided.
The removal from the silo via a screw trough below the aerating base, which feeds the crop from the middle of the silo to the outside. A sweep auger last promotes the rest into the inlet of the trough auger, so that only a very small amount of hand should be swept. Outside is the crop passed either in the mobile conveyor systems for further transport or on an elevator directly to the vehicle exhaust. The delivery rate is up to 120 t / h, the Fegeleistung at about 80 t / h.
The crop is not simply filled only center in a Bintec silo but through a distributor which is mounted in the roof space of the silo, stored. This distribution ensures that crop and chaff are introduced unentmischt and without compacted material cone, so that an optimal Belüftbarkeit is given and the crop can be removed again very homogeneous, both in terms of humidity and stocking. Advantage of storage with distribution is primarily the fact that games are of varying moisture like a sandwich above the other.
To monitor hanging in several silo sensor cable, the temperature and humidity measured continuously in the stack. In order to allow drying of the crop, the silos are equipped with an aeration floor which offers a fully perforated surface. Depending on the desired holes for grain or rapeseed / grain are possible, and both have a 13% open area. This floor made of sheet steel panels is approximately 30 cm high supports.
The outside of the silo is a ventilation fan, which blows air into the gap, which then continuously and evenly flows through the grain stack upward. In roof tailored to the fan power number ventilation hoods is mounted, which provides for a smooth transfer of the moist air. Between wall and roof panels, a gap through which condensation that may form on the inside roof, can flow to the outside.
The silos are - depending on the requirements on the maximum moisture content of the crop - made relatively shallow and wide in order to ensure a better Durchlüftbarkeit. For the drying of a maximum of 18% hydrogen, the bulk grain in the silo height is approximately 6.50 m. The performance of the ventilation fan is adapted to the size of the silo and allowing air rates of up to 60 m³ / h per ton of grain. For the drying air rate of 15 m³ / h / ton depending% removal of moisture is necessary, it can be assumed that a maximum of 4% moisture removal. Rape may be stored due to the higher flow resistance for the same claim to the removal of moisture with only about half the bed height.
The crop is largely dried with clean outdoor air. Here, a drying horizon passing through the entire stack from bottom to top. Below this horizon the crop is dry, about still wet. It is important not to interrupt this walk the horizon, before he was completely blown through the stack, because otherwise he stops, cools and the humid air is allowed to swell at this point the grains until the stack for the air is almost impenetrable. In order to remain able to ventilate even when it starts to rain during the drying phase, the supply air must be dried. This can be done through the gas heater, or heat exchanger by waste heat, for example from biogas plants. It must only be ensured that the relative humidity (RH) of the supply air is brought back into the range of 70-75%.Since the heating of the air by 1 degree has a lowering of the relative humidity by about 5% a result, it is enough even if it starts to rain, and a RH of 100% from a warming of 5 degrees to achieve a drying effect again. If one also considers that takes place solely by the compression of air by the fan, a temperature rise of about 2 degrees, it becomes clear that only small burner capacities are necessary to dry in the rain. But the decisive factor for the success of the stock air drying in the silo is primarily the rate of air that can be blown through the stack.
The entire drying process should be completed no later than 21 days, to avoid that the last embedded crop suffers excessive nutrient losses. Because the upper layer in the silo remains until the very end so wet as it was threshed or is prevented by the moist drying horizon again moist and only by the air flowing past it to warm themselves. If the drying horizon has undergone complete the silo and also corresponds to the upper layer of the desired humidity, the drying process is complete.
As a selective control of the drying process by hand is hardly possible Bintec is a software solutions that optimize the process. The system uses not only information that provides the sensor cables in the silo, and data on the conditions (temperature, rh) outside the silo and the so-called plenum below the aeration floor. From all this information, the program calculates whether it is purposeful, turn on the fan and / or the heater for a given silo for a certain time or not.
The system is based on the principle of dynamic equilibrium moisture content, so the fact that each combination of temperature and rh leads to a certain moisture in the crop. If one were to ventilate eg wheat with 15 degrees of warm air and 70% RH, it will after a certain time to reach a moisture content of about 14.6%. Stay the same external conditions, a week-long ventilation would not dry the wheat on. Is now so eg. The system operator is a target moisture content of the grain from 14.5% before, the system will initially be the fan constantly run until the highest humidity sensor in the silo measures the target moisture content or a sampling top of the stack to achieve the desired humidity confirms.
In the meantime too high rh outside, it automatically switches to the heat source to dry the supply air. This is done at intervals, depending on which temperature gradient is necessary. A temporary tendential lower drying at too low rh daytime can be tolerated. The already mentioned fact that games are of varying moisture in layers one above the other, means that for harvested dry layers also absorb moisture from humid underlying layers and the entire stack is homogenized by.
If the drying process is completed, the system switches off the fan and monitored from now on only the development of the temperatures in the stack to when a predetermined temperature rise is exceeded (thermal Nest) the fan for cooling back on. During the drying process the temperature of the stack is reduced according to experience from 15-20 degrees. If the plant operator is now a target temperature of eg. 8 degrees before, so the system waits for exactly the moment from when the outside temperature is so low that the stack is purposeful cooled, but is rh also so low that the cooling operation no rewetting of the crop takes place.