Modular high-temperature material digestion system

[0025] Example

[0026] The high-temperature material at 200-250°C is used for digestion. The material enters the raw material bin 1 from the center of the top. The group seat of the raw material bin 1 is fixed by bolts and three weighing modules 101 uniformly distributed in the circumferential direction, and the other end of the weighing module 101 is fixed by bolts. Fixed on the structural frame 10, the material enters the raw material warehouse, the volume of the raw material warehouse is 3-5m 3It has the function of material storage and buffering, and controls the material level at a certain height according to the program control requirements. A temperature sensor is installed at 1/4 of the hyperbolic cone of the raw material silo to detect and feed back the temperature of the incoming material; a weighing sensor is installed under the support group of the silo to monitor and feedback the material level in the silo; the silo cone is a hyperbolic structure.

[0027] A gate valve is set under the raw material bin, and the gate valve can be electric or manual, but the gate valve must be dynamically adjustable. A double-pipe screw scale is connected below the gate valve, a non-metallic expansion joint is installed between the double-pipe screw scale, and a non-metallic expansion joint is installed between the second-stage screw scale and the digester. The double-tube spiral scale sends the quantitative material into the digester, and the double-tube spiral scale adjusts the feeding amount according to the first-level digestion temperature measuring element, the second-level digestion temperature measuring element, the water spraying amount of the water spray system and the digestibility of the material. The first-level, second-level or multi-level digesters are equipped with temperature-measuring elements. The distance A between the temperature-measuring elements of the first-level digester and the distance B between the temperature-measuring elements of the second-level digester should be reasonably selected according to the following relationship. The first-level digestion Spacing A=(1/4-1/3)L between the temperature measuring elements of the digester, B=(1/3-1/2)L between the temperature measuring elements of the secondary digester, monitoring and feedback digestion of the temperature measuring elements The temperature of the digested material in the vessel.

[0028] The screw scale is a tightly sealed tubular structure, and a non-metallic expansion joint is installed between the first and second stages. The first stage of the spiral scale has the function of sealing and stabilizing the material flow. In the weighing process, the screw scale is equipped with a load cell, and the entire double-pipe screw scale system is closed-loop controlled. A non-metallic expansion joint is installed between the second-stage screw scale and its downstream digester to meet the requirements of sealing and temperature resistance of 200-250°C.

[0029] After quantitative measurement, the high-temperature material enters the digester 4, and is hydrated under the stirring and conveying action of the stirring rod 405. According to the measurement results of the double-pipe spiral scale 3, the first-level digester temperature measuring element 402 and the second-level digester temperature measuring element 406 monitor the temperature and quantitatively spray water, and the steam and dust generated during digestion and transportation are completed by the digestion and dust collection system 9 . The materials collected by the dust collector are conveyed by the dust collector reamer 5 installed under the dust collector housing, and a large amount of digested materials are dropped to the lateral conveying reamer by the secondary digester 403 discharge port of the digester 4 6. The horizontal conveying reamer 6 transports the final digested material to the high-seal rotary feeder 7, and the lower flange of the high-seal rotary feeder 7 is connected to the material delivery pipeline, etc., to complete the entire digestion process.

[0030] The digester is the key equipment of the digestive system. The digester has a two-stage or multi-stage structure. Each stage is a double-shaft counter-stirring structure. One stirring shaft is the driving shaft, and the driving device is installed. The gear drives the other stirring shaft to rotate.

[0031] By rationally selecting the output speed of the one-stage, two-stage or multi-stage digester drive device and arranging the length of the digester, the material digestibility of the modular high-temperature material digestion system can reach 65%-80%.

[0032] The digester accommodates and receives the high-temperature materials delivered by the double-pipe screw scale. The digester is designed as a secondary structure or a multi-stage structure according to the needs of space and process. Water spray points are set at each stage of the digester. According to the amount of material, material temperature and reaction temperature Control the water injection system to inject quantitative water into each stage of digester. The gas and dust generated during stirring, digestion and transportation are completed through the digestion and dust collection system. After digestion, the material is sent to the specially designed horizontal reamer with U-shaped shell structure. This horizontal reamer not only receives the incoming material from the digester, but also receives the material from the digestion and dust collection system. The two materials are simultaneously sent into the horizontal reamer. In the high-seal rotary feeder below the knife.