A flash drying machine for removing moisture

Abstract

The utility model relates to material drying technical field especially relates to a flash evaporation drying machine that removes moisture, including drying cylinder, the bottom of drying cylinder is provided with the crushing chamber, is provided with the stirrer in the crushing chamber, the outside of crushing chamber is surrounded with annular air duct, the bottom of annular air duct is communicated with the bottom of crushing chamber through air duct ring gap mouth, the outer wall of drying cylinder is provided with spiral feeder, spiral feeder includes inner shell cylinder and outer shell cylinder, sets up drive shaft in inner shell cylinder, is provided with spiral blade on the outer wall of drive shaft, the front part of inner shell cylinder is nested in outer shell cylinder, the front end of outer shell cylinder is connected with drying cylinder, the rear part of outer shell cylinder is connected with second air inlet, a plurality of high pressure gas blow pipes are arranged in the gap between outer shell cylinder and inner shell cylinder. The utility model removes the condensate material block that sticks to the feeding position of flash evaporation drying machine through the intermittent air blowing and the preheating mode, avoids the plugging phenomenon of discharge, guarantees normal enterprise production.

Description

Technical Field

[0001] This utility model relates to the field of material drying technology, and in particular to a flash dryer for removing moisture. Background Technology

[0002] Sodium dichloroquinoline (chemical name: sodium 3,7-dichloroquinoline-8-carboxylate) is a derivative of a series of pesticide herbicides and an indispensable intermediate in the development of new antihypertensive drugs, with a wide range of applications. Currently, domestic manufacturers of sodium dichloroquinoline carboxylate use a nitric acid oxidation process developed by the Shenyang Chemical Research Institute. The industrial route for this process involves first preparing 7-chloro-8-methylquinoline from 3-chloro-2-methylaniline and glycerol. Then, 7-chloro-8-methylquinoline undergoes a chlorination reaction with chlorine to generate 3,7-dichloro-8-methylquinoline chloride. Finally, concentrated nitric acid is used in concentrated sulfuric acid to oxidize the 3,7-dichloro-8-methylquinoline chloride to obtain sodium dichloroquinoline carboxylate. In the final process step, the centrifuged material with a moisture content of about 45% is mixed with a certain amount of caustic soda flakes and stirred thoroughly to bring the pH value of the reactant to about 10. After preliminary drying, it is sent to a flash dryer for further drying. The front end of the screw feeder of the dryer is basically flush with the inner wall of the dryer. Since the material is still wet after preliminary drying, it will quickly solidify into lumps when it encounters hot air at the outlet. In addition, there is no feeding reamer at the front end of the feeder, and the material is squeezed out by the reamer. The material is easy to stick to the feed port, which can cause blockage in severe cases and bring many adverse effects to production. Utility Model Content

[0003] Based on the above problems, the purpose of this utility model is to provide a flash drying machine for removing moisture. The technical solution adopted by this utility model is as follows:

[0004] This utility model provides a flash dryer for removing moisture, including a drying cylinder. The top of the drying cylinder has a drying outlet, and the bottom of the drying cylinder has a pulverizing chamber containing a stirrer. An annular air duct surrounds the outer side of the pulverizing chamber, and the bottom of the annular air duct communicates with the bottom of the pulverizing chamber through an annular gap. A first air inlet is provided tangentially on the outer wall of the annular air duct. A screw feeder is provided on the outer wall of the drying cylinder, and the screw feeder includes an inner shell and an outer shell. The inner shell is open at the front end and closed at the rear end. A drive shaft is installed inside the inner shell, and helical blades are installed on the outer wall of the drive shaft. The rear end of the drive shaft extends to the outside of the inner shell and is connected to a drive device. The front part of the inner shell is nested inside the outer shell. The front end of the outer shell is open and the rear end is closed. The front end of the outer shell is connected to the drying cylinder. A second air inlet is connected to the rear part of the outer shell. Multiple high-pressure air blowing pipes are arranged in the gap between the outer shell and the inner shell.

[0005] Preferably, it further includes a blower, a heater, and an air supply duct connected in a single connection. The air supply duct is connected to the first air inlet, and an external air duct is provided on the air supply duct, which is connected to the second air inlet.

[0006] Preferably, an annular air pipe is provided on the outer side of the outer shell cylinder, and the air inlet end of the high-pressure air blowing pipe passes through the outer shell cylinder and is connected to the annular air pipe. The annular air pipe is connected to the air storage tank through an air supply pipe.

[0007] Preferably, the drying outlet is sequentially connected to a cyclone separator, a bag filter, and an induced draft fan via a feeding duct.

[0008] Preferably, an airflow reflector cone is provided at the bottom of the pulverizing chamber.

[0009] Preferably, the inner wall of the drying cylinder is provided with a downwardly inclined baffle ring plate, which is located below the drying outlet.

[0010] Preferably, a first flange is provided on the outer wall of the inner shell, and a second flange is provided at the rear end of the outer shell, the first flange and the second flange being fixed together by a bolt assembly.

[0011] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0012] This invention removes clumps of condensed material adhering to the feed position of a flash dryer through intermittent air blowing and preheating, thus preventing blockage at the discharge point and ensuring normal production. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the drying cylinder part of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the screw feeder of this utility model;

[0016] Figure 3 This is a schematic diagram of the overall structure of the flash dryer for removing moisture according to this utility model.

[0017] Explanation of reference numerals in the attached drawings: 1. Drying cylinder; 101. Drying outlet; 102. Crushing chamber; 2. Agitator; 103. Airflow reflector cone; 104. Barrier ring plate; 3. Annular air duct; 301. Air duct annular gap; 302. First air inlet; 4. Screw feeder; 401. Inner shell; 402. Outer shell; 403. Drive shaft; 404. Spiral blades; 405. Drive unit; 406. Second air inlet; 407. High-pressure air blowing pipe; 408. Annular air pipe; 409. First flange; 410. Second flange; 5. Blower; 6. Heater; 7. Air supply duct; 8. External air duct; 9. Air storage tank; 10. Cyclone separator; 11. Bag filter; 12. Exhaust fan. Detailed Implementation

[0018] To make the technical problems, technical solutions and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] like Figures 1 to 3 As shown, this embodiment discloses a flash dryer for removing moisture, including a drying cylinder 1. A drying outlet 101 is provided at the top of the drying cylinder 1. The drying outlet 101 is sequentially connected to a cyclone separator 10, a bag filter 11, and an induced draft fan 12 via a feeding duct. The cyclone separator 10 and the bag filter 11 collect the pulverized and dried material.

[0020] The bottom of the drying cylinder 1 is provided with a pulverizing chamber 102, and a stirrer 2 is provided in the pulverizing chamber 102. The stirrer 2 is mainly composed of a shaft, pulverizing and stirring blades, and a drive motor. An annular air duct 3 surrounds the outside of the pulverizing chamber 102. The bottom of the annular air duct 3 is connected to the bottom of the pulverizing chamber 102 through an annular gap 301. A first air inlet 302 is provided on the outer wall of the annular air duct 3 along the tangential direction.

[0021] A screw feeder 4 is installed on the outer wall of the drying cylinder 1. The screw feeder 4 includes an inner shell cylinder 401 and an outer shell cylinder 402. The front end of the inner shell cylinder 401 is open, and the rear end is closed. A drive shaft 403 is installed inside the inner shell cylinder 401. Spiral blades 404 are installed on the outer wall of the drive shaft 403. The front end of the drive shaft 403 is connected to the inner shell cylinder 401 through a suspension bearing. The rear end of the drive shaft 403 extends to the outside of the inner shell cylinder 401 and is connected to a drive device 405, which is generally a motor. The front part of the inner shell cylinder 401 is nested inside the outer shell cylinder 402. The front end of the outer shell cylinder 402 is open, and the rear end is closed. The front end of the outer shell cylinder 402 is connected to the drying cylinder 1, and the rear end of the outer shell cylinder 402 is connected to a second air inlet 406. Multiple high-pressure air blowing pipes 407 are arranged in the gap between the outer shell cylinder 402 and the inner shell cylinder 401.

[0022] Both the first air inlet 302 and the second air inlet 406 are connected to the hot air blower. When this utility model is working, the screw feeder 4 adds wet material into the drying cylinder 1. The hot air generated by the hot air blower enters the gap between the inner shell cylinder 401 and the outer shell cylinder 402 to preheat the wet material. This serves two purposes: first, to perform preliminary drying, and second, to reduce the temperature difference of the wet material at the outlet of the screw feeder 4, thus preventing it from rapidly condensing into solidified blocks when exposed to the high-temperature hot air inside the drying cylinder 1. At the same time, the high-pressure air blowing pipe 407, which is arranged in the gap between the outer shell cylinder 402 and the inner shell cylinder 401, intermittently blows out high-pressure air, blowing the solidified material blocks at the outlet of the screw feeder 4 into the drying cylinder 1.

[0023] In this embodiment, an annular air pipe 408 is provided on the outer side of the outer shell 402. The air inlet end of the high-pressure air blowing pipe 407 passes through the outer shell 402 and is connected to the annular air pipe 408. The annular air pipe 408 is connected to the air storage tank 9 through an air supply pipeline, and the air storage tank 9 is connected to an air compressor. A solenoid valve is provided on the air supply pipeline. The solenoid valve is opened and closed by a controller to realize the intermittent blowing of high-pressure air from the high-pressure air blowing pipe 407.

[0024] In this embodiment, a first flange 409 is welded to the outer wall of the inner shell 401, and a second flange 410 is welded to the rear end of the outer shell 402. The first flange 409 and the second flange 410 are fixed by bolt assembly, and the inner shell 401 and the outer shell 402 are detached and connected by the flange structure.

[0025] In this embodiment, a downwardly inclined baffle ring 104 is welded to the inner wall of the drying cylinder 1, and the baffle ring 104 is located below the drying outlet 101. The baffle ring 104 can block materials with larger particle sizes, and the materials fall downwards and are then subjected to secondary drying and pulverization.

[0026] In this embodiment, an airflow reflecting cone 103 is provided at the bottom of the pulverizing chamber 102. The airflow reflecting cone 103 reflects the hot airflow entering from the air duct annular gap 301, thereby increasing the lift of the hot airflow.

[0027] In this embodiment, the hot air blowing device includes a blower 5, a heater 6 and an air supply pipe 7 connected in one step. The air supply pipe 7 is connected to the first air inlet 302. An external air pipe 8 is provided on the air supply pipe 7 and is connected to the second air inlet 406.

[0028] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A flash dryer for removing moisture, comprising a drying cylinder (1), wherein a drying outlet (101) is provided at the top of the drying cylinder (1), a pulverizing chamber (102) is provided at the bottom of the drying cylinder (1), a stirrer (2) is provided in the pulverizing chamber (102), an annular air duct (3) surrounds the outer side of the pulverizing chamber (102), the bottom of the annular air duct (3) is connected to the bottom of the pulverizing chamber (102) through an annular gap (301), and a first air inlet (302) is provided on the outer wall of the annular air duct (3) along the tangential direction, characterized in that: A screw feeder (4) is provided on the outer wall of the drying cylinder (1). The screw feeder (4) includes an inner shell cylinder (401) and an outer shell cylinder (402). The front end of the inner shell cylinder (401) is open, and the rear end is closed. A drive shaft (403) is provided inside the inner shell cylinder (401). A spiral blade (404) is provided on the outer wall of the drive shaft (403). The rear end of the drive shaft (403) extends to the outside of the inner shell cylinder (401) and then connects with the drive shaft. The inner shell (401) is connected to the actuator (405). The front part of the inner shell (401) is nested inside the outer shell (402). The front end of the outer shell (402) is open and the rear end is closed. The front end of the outer shell (402) is connected to the drying cylinder (1). The rear part of the outer shell (402) is connected to a second air inlet (406). Multiple high-pressure air blowing pipes (407) are arranged in the gap between the outer shell (402) and the inner shell (401).

2. The flash dryer for removing moisture according to claim 1, characterized in that: It also includes a blower (5), a heater (6) and an air supply duct (7) connected in one step. The air supply duct (7) is connected to the first air inlet (302). An external air duct (8) is provided on the air supply duct (7) and is connected to the second air inlet (406).

3. The flash dryer for removing moisture according to claim 1, characterized in that: An annular air pipe (408) is provided on the outside of the outer shell (402). The air inlet end of the high-pressure air blowing pipe (407) passes through the outer shell (402) and is connected to the annular air pipe (408). The annular air pipe (408) is connected to the air storage tank (9) through an air supply pipe.

4. The flash dryer for removing moisture according to claim 1, characterized in that: The drying outlet (101) is connected in sequence to a cyclone separator (10), a bag filter (11), and an induced draft fan (12) via a feeding duct.

5. The flash dryer for removing moisture according to claim 1, characterized in that: An airflow reflector cone (103) is provided at the bottom of the pulverizing chamber (102).

6. The flash dryer for removing moisture according to claim 1, characterized in that: The inner wall of the drying cylinder (1) is provided with a downwardly inclined baffle ring plate (104), which is located below the drying outlet (101).

7. The flash dryer for removing moisture according to claim 1, characterized in that: A first flange (409) is provided on the outer wall of the inner shell (401), and a second flange (410) is provided at the rear end of the outer shell (402). The first flange (409) and the second flange (410) are fixed by bolt assembly.

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