Closed-cycle spray dryer

Abstract

The utility model discloses a closed cycle spray dryer, and relates to the technical field of spray dryers. Comprising a drying tank, a feeding pipe is connected to the top of the drying tank, a centrifugal atomizer matched with the feeding pipe is arranged on the inner wall of the top of the drying tank, an annular pipe externally connected with a hot gas conveying pipeline is wound around the outer wall of the drying tank, a nozzle extending into the drying tank is connected to the annular pipe, and a fixing ring is fixedly arranged in an inner cavity of the drying tank; the inner wall of the fixing ring is connected with a mounting ring through an elastic assembly, a sleeve with openings in the top and the bottom is mounted on the mounting ring, and the centrifugal atomizer extends into the opening in the top of the sleeve. According to the closed-cycle spray dryer, the centrifugal atomizer is arranged in the top opening of the sleeve, so that dried materials can be formed in the sleeve, hot gas sprayed out of the nozzle can impact the sleeve, the sleeve is shaken, attachment of the materials to the inner wall of the sleeve is reduced, and the material forming efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of spray dryers, in particular to a closed-circuit spray dryer. Background Art

[0002] Spray drying is the most widely used process in liquid forming and drying industries. It is most suitable for producing powdered and granular solid products from solutions, emulsions, suspensions and paste-like liquid raw materials. Therefore, when the particle size distribution, residual moisture content, bulk density and particle shape of the finished product must meet precise standards, spray drying is an ideal process. Closed-loop spray dryers are often used in the spray drying process.

[0003] In the use of the existing spray dryer, the material is sprayed out in the form of mist through the atomizer and is dried into coarse powder in a very short time in parallel contact with the heated air. After being dried, the material is easy to adhere to the inner wall of the drying tank, which reduces the material forming efficiency. Summary of the invention

[0004] The utility model provides a closed-circuit circulation spray dryer to solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a closed-loop circulation spray dryer, comprising a drying tank, the top of which is connected to a feed pipe, the top inner wall of the drying tank is provided with a centrifugal atomizer matched with the feed pipe, the outer wall of the drying tank is surrounded by an annular tube connected to an external hot gas delivery pipeline, the annular tube is connected to a nozzle extending into the drying tank, the inner cavity of the drying tank is fixed with a fixing ring, the inner wall of the fixing ring is connected to a mounting ring through an elastic component, a sleeve with top and bottom openings is installed on the mounting ring, and the centrifugal atomizer extends into the top opening of the sleeve.

[0006] Furthermore, the nozzles are arranged obliquely toward the inner cavity of the sleeve, and the nozzles are distributed in a ring shape along the inner wall of the drying tank.

[0007] Furthermore, the sleeve is tapered as a whole, and its bottom end extends into the discharge port of the drying tank, and the diameter of the top opening of the sleeve is larger than the diameter of the bottom opening.

[0008] Furthermore, the elastic component includes a spring, and the inner wall of the fixing ring is connected to the mounting ring through the springs distributed in a ring shape along the outer wall of the mounting ring.

[0009] Furthermore, a protective sheath is provided on the spring.

[0010] Furthermore, the inner cavity of the drying tank is provided with a protrusion located on the fixing ring, and the protrusion is used to limit the shaking of the sleeve.

[0011] Furthermore, at least four protrusions are provided and are distributed in a ring shape along the inner wall of the drying tank.

[0012] Furthermore, a rubber pad is provided on the outer wall of the protrusion.

[0013] Compared with the prior art, the utility model provides a closed-circuit circulation spray dryer having the following beneficial effects: the closed-circuit circulation spray dryer, by arranging the centrifugal atomizer in the top opening of the sleeve, can shape the dried material in the sleeve, and the hot gas ejected from the nozzle can impact the sleeve, causing the sleeve to shake, so as to reduce the adhesion of the material on the inner wall of the sleeve and improve the material forming efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the planar structure of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the sleeve of the utility model;

[0017] Figure 4 It is a structural schematic diagram of the mounting ring of the utility model.

[0018] In the figure: 1, drying tank; 2, feed pipe; 3, centrifugal atomizer; 4, annular tube; 5, nozzle; 6, fixing ring; 7, mounting ring; 8, sleeve; 9, spring; 10, sheath; 11, bump; 12, rubber pad. Implementation

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-4The utility model discloses a closed-loop spray dryer, comprising a drying tank 1, a feed pipe 2 is connected to the top of the drying tank 1, a centrifugal atomizer 3 matched with the feed pipe 2 is arranged on the top inner wall of the drying tank 1, an annular tube 4 connected to an external hot gas delivery pipeline is arranged around the outer wall of the drying tank 1, a nozzle 5 extending into the drying tank 1 is connected to the annular tube 4, a fixing ring 6 is fixedly arranged in the inner cavity of the drying tank 1, a mounting ring 7 is connected to the inner wall of the fixing ring 6 through an elastic component, a sleeve 8 with top and bottom openings is installed on the mounting ring 7, and the centrifugal atomizer 3 extends into the top opening of the sleeve 8; by arranging the centrifugal atomizer 3 in the top opening of the sleeve 8, the dried material can be formed in the sleeve 8, and the hot gas ejected from the nozzle 5 can impact the sleeve 8, causing the sleeve 8 to shake, so as to reduce the adhesion of the material on the inner wall of the sleeve 8 and improve the material forming efficiency.

[0021] The sleeve 8 is tapered as a whole, and its bottom end extends into the discharge port of the drying tank 1. The diameter of the top opening of the sleeve 8 is larger than the diameter of the bottom opening.

[0022] Specifically, the nozzles 5 are arranged to be inclined toward the inner cavity of the sleeve 8 , and the nozzles 5 are distributed in a ring shape along the inner wall of the drying tank 1 .

[0023] In this embodiment, multiple nozzles 5 are provided, and the hot gas ejected can dry the atomized material. In the process of ejecting hot gas from the nozzle 5, the sleeve 8 is also impacted, causing the sleeve 8 to shake, so as to promote the falling of the material attached to its surface.

[0024] Specifically, the elastic component includes a spring 9 , and the inner wall of the fixing ring 6 is connected to the mounting ring 7 via the spring 9 distributed in a ring shape along the outer wall of the mounting ring 7 .

[0025] The spring 9 is covered with a sheath 10 .

[0026] In this embodiment, the spring 9 is provided to make the sleeve 8 installed on the mounting ring 7 shake, so as to promote the falling of the material attached to the inner wall. A vibration motor can be installed on the outer wall of the sleeve 8 to further promote the shaking of the sleeve 8.

[0027] The two ends of the spring 9 are hung on the mounting ring 7 and the fixing ring 6 respectively, and the mounting ring 7 and the fixing ring 6 are provided with hanging holes for hanging the spring 9 .

[0028] Specifically, the inner cavity of the drying tank 1 is provided with a protrusion 11 located on the fixing ring 6 , and the protrusion 11 is used to limit the shaking of the sleeve 8 .

[0029] At least four protrusions 11 are provided and distributed in a ring shape along the inner wall of the drying tank 1 .

[0030] A rubber pad 12 is disposed on the outer wall of the protrusion 11 .

[0031] In this embodiment, when the sleeve 8 shakes, the sleeve 8 may contact the protrusion 11 and vibrate, and the provision of the rubber pad 12 can protect the sleeve 8 to reduce the damage of the protrusion 11 to the sleeve 8.

[0032] In summary, the closed-loop spray dryer, by arranging the centrifugal atomizer 3 in the top opening of the sleeve 8, can form the dried material in the sleeve 8, and the hot gas ejected from the nozzle 5 can impact the sleeve 8, causing the sleeve 8 to shake, so as to reduce the adhesion of the material on the inner wall of the sleeve 8 and improve the material forming efficiency.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A closed-circuit spray dryer, comprising a drying tank (1), characterized in that: The top of the drying tank (1) is connected to a feed pipe (2), the top inner wall of the drying tank (1) is provided with a centrifugal atomizer (3) cooperating with the feed pipe (2), the outer wall of the drying tank (1) is surrounded by an annular tube (4) connected to an external hot gas delivery pipeline, the annular tube (4) is connected to a nozzle (5) extending into the drying tank (1), the inner cavity of the drying tank (1) is fixedly provided with a fixing ring (6), the inner wall of the fixing ring (6) is connected to a mounting ring (7) via an elastic component, the mounting ring (7) is provided with a sleeve (8) with top and bottom openings, and the centrifugal atomizer (3) extends into the top opening of the sleeve (8).

2. A closed-circuit spray dryer according to claim 1, characterized in that: The nozzles (5) are arranged obliquely toward the inner cavity of the sleeve (8), and the nozzles (5) are distributed in a ring shape along the inner wall of the drying tank (1).

3. A closed-circuit spray dryer according to claim 1, characterized in that: The sleeve (8) is tapered as a whole, and its bottom end extends into the discharge port of the drying tank (1). The diameter of the top opening of the sleeve (8) is larger than the diameter of the bottom opening.

4. A closed-circuit spray dryer according to claim 1, characterized in that: The elastic component comprises a spring (9), and the inner wall of the fixing ring (6) is connected to the mounting ring (7) via the spring (9) distributed in an annular shape along the outer wall of the mounting ring (7).

5. A closed-circuit spray dryer according to claim 4, characterized in that: The spring (9) is covered with a protective sleeve (10).

6. A closed-circuit spray dryer according to claim 1, characterized in that: The inner cavity of the drying tank (1) is provided with a protrusion (11) located on the fixing ring (6), and the protrusion (11) is used to limit the shaking of the sleeve (8).

7. A closed-circuit spray dryer according to claim 6, characterized in that: At least four protrusions (11) are provided and are distributed in a ring shape along the inner wall of the drying tank (1).

8. A closed-circuit spray dryer according to claim 6, characterized in that: The outer wall of the protrusion (11) is provided with a rubber pad (12).

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