Continuous type grain drying water online detection and control method and system based on continuous mass flow method
A technology of grain drying and measuring method, which is applied in the directions of drying solid materials, preserving seeds by drying, drying, etc., can solve problems such as errors, inability to directly obtain outlet moisture, moisture calculation deviation, etc., and achieve the effect of improving the degree of automation
Active Publication Date: 2016-01-20
JILIN UNIV +1
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Problems solved by technology
However, this method can only calculate the average moisture content of the grain in the dryer during the drying process, and cannot directly obtain the outlet moisture. The outlet moisture needs to be calculated by a drying model, resulting in certain errors
Moreover, this method measures the real-time material level change of the grain inside the dryer by using a laser or a resistance-rotating material level sensor, and calculates the corresponding volume. Due to factors such as the uncertain shape of the grain material pile, the volume calculation is inaccurate, which will also lead to moisture calculation. deviation
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[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.
[0034] It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.
[0035] Step 1. Job initialization: input and store the initial average moisture value M of the grain to be dried in the control display unit of the dryer 0 , target moisture value M T , heat medium temperature and humidity T, grain discharge frequency G g ;
[0036] Step 2. The first grain feeding operation: start the grain feeding operation with double-limit material level control, manually or automatically start the dryer to feed grain, and transport the high-moisture grains to be dried into the dryer. When the grains in the dryer reach the position of the feeding level senso...
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The invention discloses a continuous type grain drying water online detection and control method and system based on a continuous mass flow method. Grains continuously enter a dryer, and the dryer continuously discharges the grains; belt weighers detect the weight of the grains entering the dryer and the weight of the grains which are discharged out of the dryer within unit time in real time; and the water in the dried grains can be directly calculated through the detected weight of the wet grains and the detected weight of the dried grains. The invention further provides a continuous type grain drying automatic operation system. The system comprises a dyer body used for drying the grains, a wet grain belt weigher in front of a tower, and a dry grain belt weigher behind the tower, wherein the wet grain belt weigher can detect the weight of inflow grains within unit time, and the dry grain belt weigher can detect the weight of grains discharged out of the dryer within unit time. By means of the method and system, the water detection whole-area precision is superior to + / -0.5%, target control, speed limitation control and constant-speed control are performed in the drying process, and therefore the water of the dried grains and the target water can be controlled within the error range by adjusting the drying time, and the automation degree of the dryer is improved due to the accurately-controlled water of the dried grains.
Description
technical field [0001] The invention relates to a continuous on-line detection method and a measurement and control system for grain dry moisture based on a continuous mass flow method. More specifically, the present invention relates to a continuous grain drying online measurement and control method based on continuous mass flow method and a continuous grain drying automatic operation system. Background technique [0002] The basic goal of grain drying is to remove the moisture in the grain with the lowest drying cost and energy consumption under the premise of keeping the drying process stable. Therefore, the online measurement and control of moisture in the grain drying process is very important to the grain drying work. [0003] The traditional on-line measurement and control of grain drying moisture is based on the capacitance method or resistance method on-line measurement and control of moisture, using switch control, classic PID control or modern intelligent predict...
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IPC IPC(8): F26B25/22G01N5/04A23B9/08
Inventor 吴文福刘哲韩峰张亚秋徐岩吴玉柱吴新怡
Owner JILIN UNIV