Coffee powder spray drying device and process

Abstract

The present invention relates to the technical field of drying equipment, and specifically to a coffee powder spray drying treatment device and process, comprising a tank body, a centrifugal spray tube installed in the middle of the top end of the tank body, a negative pressure discharge pipe installed at the bottom end of the tank body, and a hot air inlet pipe installed at the top of one side of the tank body; the discharge portion of the centrifugal spray tube is located inside the tank body, and sprays droplets to all sides; the output end of the hot air inlet pipe extends to the inside of the tank body; a rotatable shielding cover is provided on the outside of the centrifugal spray tube, the diameter of the shielding cover increases from top to bottom, and a space for hot air to flow downward is formed between the shielding cover and the inner wall of the tank body; through the setting of the shielding cover, the coffee material liquid will spray droplets to its periphery after passing through the centrifugal spray tube, and when the droplets with large mass are sprayed out, they will hit the inner wall of the shielding cover and slide down, and hang at the bottom edge of the shielding cover, thereby reducing the situation of large-area sticking of material.

Description

Technical Field

[0001] The present invention relates to the technical field of drying equipment, and in particular to a coffee powder spray drying treatment device and process. Background Art

[0002] Spray drying is a process in which the liquid raw material passes through a centrifugal spray head at a suitable air inlet temperature. The liquid is sprayed out in the form of droplets and leaves the atomizer, arriving at the middle or bottom of the tank cavity. The outlet air temperature continues to provide a heat source. Most of the moisture is removed the moment the droplets come into contact with the hot air. The droplet liquid continues to evaporate until the shell of the product particles is completely formed. Coffee powder is usually produced using this processing method.

[0003] During the actual processing, when the liquid raw materials are sprayed out in all directions through the centrifugal spray head, the larger droplets will collide with the inner wall of the tank and adhere to it during flight. As the high temperature in the tank continues to dry the sticky material, it will lose its stickiness and fall off after carbonization. The partially carbonized coffee particles will lead to a decline in quality and taste. Summary of the Invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0005] The present invention provides a coffee powder spray drying device, which can prevent the coffee liquid from adhering to the inner wall of the tank and from being charred due to excessive drying. The specific scheme is as follows:

[0006] A coffee powder spray drying device comprises a tank body, a centrifugal spray pipe installed in the middle of the top end of the tank body, a negative pressure discharge pipe installed at the bottom end of the tank body, and a hot air inlet pipe installed at the top of one side of the tank body; the discharge portion of the centrifugal spray pipe is located inside the tank body and sprays droplets in all directions; the output end of the hot air inlet pipe extends into the interior of the tank body; a rotatable shielding cover is provided on the outside of the centrifugal spray pipe, the shielding cover is located below the hot air inlet pipe, the diameter of the shielding cover increases from top to bottom, an opening for the droplets to fall is provided at the bottom of the shielding cover, and a space for the hot air to flow downward is formed between the shielding cover and the inner wall of the tank body.

[0007] As a preferred solution of the coffee powder spray drying treatment device described in the present invention, the inner wall of the tank body is laterally installed with a horizontal plate located below the shielding cover, and a scraper is obliquely installed on the horizontal plate. After passing through the bottom opening of the shielding cover, the scraper is fitted with the inner wall of the shielding cover.

[0008] As a preferred solution of the coffee powder spray drying device of the present invention, the thickness of the scraper gradually becomes thinner toward the inner wall of the shielding cover.

[0009] As a preferred embodiment of the coffee powder spray drying device of the present invention, an air duct is further installed on the tank body, and the air duct is used to transport the hot air output from the hot air inlet pipe to the middle of the tank body.

[0010] As a preferred embodiment of the coffee powder spray drying treatment device of the present invention, the air duct further includes an inlet and an outlet, the inlet is located in the space formed between the shielding cover and the circumferential inner wall of the tank body, the outlet is located in the middle of the inner cavity of the tank body, and the outlet is also connected to a two-way pipe arranged vertically.

[0011] As a preferred embodiment of the coffee powder spray drying device of the present invention, the centrifugal spray tube is provided with a rotating ring on the outside, and a plurality of connecting rods are arranged on the circumference of the outer wall of the rotating ring, and the tail ends of the plurality of connecting rods are connected to the top end of the shielding cover.

[0012] As a preferred solution of the coffee powder spray drying processing device of the present invention, wherein: support rods are horizontally installed on the multiple connecting rods, a concave plate is installed at the tail end of the support rod, and the inner concave part of the concave plate is located on the output path of the hot air inlet pipe.

[0013] As a preferred embodiment of the coffee powder spray drying device of the present invention, the back of the concave plate is an arc surface.

[0014] As a preferred embodiment of the coffee powder spray drying device of the present invention, the inner wall of the shielding cover is coated with an anti-stick coating.

[0015] A coffee powder spray drying process is applied to the above-mentioned coffee powder spray drying device, and the process comprises the following steps:

[0016] S1. Preheat the interior of the tank through the hot air inlet pipe, and then spray the coffee liquid through the centrifugal spray pipe;

[0017] S2: The liquid sprayed in step S1 will come into contact with the high temperature inside the tank and evaporate into particles. The large droplets will collide with the inner wall of the shielding cover, forming irregular droplets that spread around and continue to evaporate into particles inside the tank.

[0018] S3. The hot air discharged from the air inlet pipe will flow through the space formed between the shielding cover and the inner wall of the tank body. During the flow of hot air, negative pressure is formed at the bottom of the shielding cover, and some adhesive materials adhering to the inner wall of the shielding cover are attracted and fall off.

[0019] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0020] The device is equipped with a shielding cover. After the coffee liquid passes through the centrifugal spray tube, it will spray droplets to its periphery. When the droplets with large mass are sprayed out, they will hit the inner wall of the shielding cover and slide down, and hang at the bottom edge of the shielding cover, reducing the situation of large-area sticking of the material. At the same time, after the material liquid collides with the inner wall of the shielding cover, the material liquid is first flattened and then scattered to the surroundings. During the dispersion process, the material liquid will fully contact with the heat in the tank body to evaporate and form solid particles. After the powder is formed, it falls downward and is collected due to its own mass and the negative pressure suction of the negative pressure discharge pipe.

[0021] Other features and advantages of the invention will be described in the following description, and part of them will become obvious from the description or be understood by practicing the invention. The purpose and other advantages of the invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0023] Figure 1 The figure is a schematic diagram of the overall structure of the coffee powder spray drying device of the present invention.

[0024] Figure 2 The figure is a schematic diagram of the internal structure of the tank in the coffee powder spray drying device of the present invention.

[0025] Figure 3 The figure is a schematic top view of the structure of the shielding cover in the coffee powder spray drying device of the present invention.

[0026] Figure 4 The figure is a schematic diagram of the internal structure of the shielding cover in the coffee powder spray drying device of the present invention.

[0027] Figure 5 The figure is a schematic diagram of the axial structure of the scraper in the coffee powder spray drying device of the present invention.

[0028] The accompanying drawings are numerals as follows:

[0029] 1. Tank body; 101. Centrifugal spray pipe; 102. Negative pressure discharge pipe; 103. Hot air inlet pipe;

[0030] 2. Shield; 201. Swivel; 202. Connecting rod; 203. Concave plate;

[0031] 3. Horizontal plate; 301, scraper;

[0032] 4. Air duct; 401, inlet; 402, two-way pipe. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0037] Example

[0038] Reference Figures 1 to 5As shown, the present invention provides a coffee powder spray drying treatment device, comprising a tank body 1, a centrifugal spray tube 101 installed in the middle of the top of the tank body 1, a negative pressure discharge pipe 102 installed at the bottom end of the tank body 1 and a hot air inlet pipe 103 installed at the top of one side of the tank body 1, wherein the tank body 1 is divided into a columnar cavity and a conical cavity from top to bottom, the negative pressure discharge pipe 102 is connected to an external negative pressure fan and draws the powder out of the tank body 1; the input end of the hot air inlet pipe 103 is connected to an external heating box and a blower, the air drawn in by the blower is first cleaned, and then the treated air is output through the heating box and the output end of the hot air inlet pipe 103, the output hot air can preheat the interior of the tank body 1, and the hot air is also a heat source for coffee spray evaporation drying; the discharge part of the centrifugal spray tube 101 is located inside the tank body 1, and sprays droplets to the surroundings; the above are all existing technologies and will not be repeated here.

[0039] Among them, the output end of the hot air inlet pipe 103 extends to the interior of the tank body 1 and continuously blows hot air into the interior of the tank body 1; a rotatable shielding cover 2 is provided on the outside of the centrifugal spray pipe 101, and the shielding cover 2 is located below the hot air inlet pipe 103. The diameter of the shielding cover 2 increases from top to bottom (the shielding cover 2 is an isosceles trapezoid when viewed from the front section), and an opening for the droplets to fall is opened at the bottom of the shielding cover 2. A space for the hot air to flow downward is formed between the shielding cover 2 and the inner wall of the tank body 1; that is, after the coffee liquid passes through the centrifugal spray pipe 101, it will spray droplets to its periphery. When the droplets with large mass are sprayed out, It will collide with the inner wall of the shielding cover 2. Since the diameter of the shielding cover 2 increases from top to bottom, its inner wall also increases, that is, the wall thickness formed between the inner wall and the outer wall is consistent, so the material liquid on the inner wall of the shielding cover 2 will always slide downward and hang at the bottom edge of the shielding cover 2, reducing the situation of large-area sticking of the material. At the same time, after the material liquid collides with the inner wall of the shielding cover 2, the material liquid is first flattened and then scattered to the surroundings. During the dispersion process, the material liquid will fully contact with the heat in the tank body 1 to evaporate and form solid particles. After the powder is formed, it falls downward and is collected due to its own mass and the negative pressure suction of the negative pressure discharge pipe 102;

[0040] Moreover, the continuous blowing of the hot air inlet pipe 103 will be injected into the space formed between the shielding cover 2 and the inner wall of the circumference of the tank body 1, and after passing through the narrow interval between the outer ring of the bottom of the shielding cover 2 and the inner wall of the tank body 1 from top to bottom, it will quickly flow downward and be discharged to the bottom of the shielding cover 2. At this time, the hot air will move vertically downward along the inner wall of the tank body 1. When the hot air flows under the shielding cover 2, negative pressure will be generated on the inner side of the shielding cover 2. Under the action of negative pressure, the particles inside the shielding cover 2 or adhering to the inner side of the shielding cover 2 will be The powder on the inner wall is "attracted" to the inner wall of the tank body 1, and the hot air moves vertically downward along the inner wall of the tank body 1. At this time, a downward conveying force will be formed on the powder and the sticky material adhering to the inner wall of the tank body 1. The powder will move to the bottom of the tank body 1 with the guidance of the wind and be drawn away at the negative pressure discharge pipe 102. At the same time, it can also prevent the powder from returning to the top and sticking to the wall. That is, the cooperation between the shielding cover 2 and the hot air flow space can prevent the powder from rising upward and sticking to the inner wall of the top of the tank body 1.

[0041] Specifically, the outer portion of the centrifugal spray tube 101 is covered with a swivel 201, the centrifugal spray tube 101 is fixed, the swivel 201 is rotatably connected to the centrifugal spray tube 101, and a plurality of connecting rods 202 are arranged on the circumference of the outer wall of the swivel 201. The tail ends of the plurality of connecting rods 202 are connected to the top of the shielding cover 2. A support rod is installed horizontally on each of the plurality of connecting rods 202. A concave plate 203 is installed at the tail end of the support rod, and the inner concave portion of the concave plate 203 is located on the output path of the hot air inlet pipe 103; that is, on the hot air inlet pipe 10 In addition to continuous air blowing, without using an external drive, the concave plate 203 can also be rotated by blowing air, and the concave plate 203 drives the connecting rod 202, the shield 2 and the rotating ring 201 to rotate outside the centrifugal spray tube 101. The droplets or sticky materials adhering to the inner wall thereof are shaken off by the rotation, so that the formed powder is discharged to the negative pressure discharge pipe 102 along with the vertical downward air blowing, thereby preventing the sticky materials from adhering to the inner wall of the shield 2 for a long time and being heated and dried, thereby solving the problem of coking of the coffee powder.

[0042] A horizontal plate 3 located below the shielding cover 2 is horizontally installed on the inner wall of the tank body 1, and a scraper 301 is obliquely installed on the horizontal plate 3. After passing through the bottom opening of the shielding cover 2, the scraper 301 fits against the inner wall of the shielding cover 2; that is, based on the rotation of the shielding cover 2, the inner circle wall of the shielding cover 2 will contact the scraper 301, and the sticky material on the inner wall will be removed by the scraper 301. After the sticky material is separated from the inner wall of the shielding cover 2, it falls and is collected by gravity.

[0043] The thickness of the scraper 301 gradually becomes thinner towards the inner wall of the shielding cover 2. Since the end of the scraper 301 that contacts the inner wall of the shielding cover 2 is thinner (the contact area between the two is small), the resistance between the scraper 301 and the shielding cover 2 will be reduced, so that the shielding cover 2 can be kept in rotation without adding external drive by the wind force continuously output by the hot air inlet pipe 103.

[0044] In order to improve the utilization rate of hot air, an air duct 4 is also installed on the tank body 1. The air duct 4 is used to transport the hot air output from the hot air inlet pipe 103 to the middle of the tank body 1. It is well known that the density of hot air is small and it will spread over the top of the tank body 1. At this time, through the setting of the air duct 4, the relative temperature of the top and middle of the tank body 1 can be kept constant.

[0045] The air duct 4 also includes an inlet 401 and an outlet. The inlet 401 is located in the space formed between the shielding cover 2 and the inner wall of the tank body 1. The outlet is located in the middle of the inner cavity of the tank body 1. The outlet is also connected to a two-way pipe arranged vertically; that is, on the basis of continuous blowing of the hot air inlet pipe 103, part of the gas will also flow from the inlet 401 of the air duct 4 to the outlet, and after flowing from the outlet to the two-way pipe, it will be divided into two air flows and then discharged upward / downward respectively. In the process, when the centrifugal spray tube 101 sprays droplets to the surroundings, it will also have When some water droplets drop vertically directly from the bottom of the centrifugal spray tube 101, the mass of the water droplets is relatively large, and its drying speed will be slower than that of the spray-like liquid. When the water droplets fall vertically, the upward exhaust of the two-way pipe will disturb the air inside the tank body 1 and slow down the falling speed of the droplets, so that it can fully evaporate and dry with the heat flow in the tank body 1. The downward exhaust of the two-way pipe is used to quickly gather the powder suspended in the conical cavity of the tank body 1 after forming to the negative pressure discharge pipe 102, and be discharged and collected through the negative pressure discharge pipe 102.

[0046] The back of the concave plate 203 is an arc surface, and the setting of the arc surface can reduce the resistance of the concave plate 203 during the rotation process, thereby allowing the shielding cover 2 to form continuous rotation.

[0047] The inner wall of the shielding cover 2 is coated with an anti-stick coating, which can be a Teflon coating or a ceramic coating. For details, please refer to the existing technology "non-stick pan", which reduces the adhesion of coffee liquid to the inner wall of the shielding cover 2 and avoids the carbonization of the liquid due to long-term adhesion, thereby improving the quality of the raw materials.

[0048] A coffee powder spray drying process is applied to the above-mentioned coffee powder spray drying device, and the process comprises the following steps:

[0049] S1. Preheat the interior of the tank 1 through the hot air inlet pipe 103, and then spray the coffee liquid through the centrifugal spray pipe 101;

[0050] S2, the liquid sprayed in step S1 will come into contact with the high temperature in the tank body 1 and evaporate into particles. The large-mass droplets will collide with the inner wall of the shielding cover 2, forming irregular droplets that spread around and continue to evaporate into particles in the tank body 1;

[0051] S3. The hot air discharged from the hot air inlet pipe 103 will flow through the space formed between the shielding cover 2 and the inner wall of the tank body 1. During the flow of hot air, negative pressure is formed at the bottom of the shielding cover 2, and part of the adhesive adhering to the inner wall of the shielding cover 2 is attracted and falls off.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A coffee powder spray drying device, characterized by: It includes a tank body, a centrifugal spray pipe installed in the middle of the top of the tank body, a negative pressure discharge pipe installed at the bottom of the tank body, and a hot air inlet pipe installed at the top of one side of the tank body; The discharge portion of the centrifugal spray tube is located inside the tank body and sprays droplets in all directions; The output end of the hot air inlet pipe extends to the interior of the tank; A rotatable shielding cover is provided on the outside of the centrifugal spray tube. The shielding cover is located below the hot air inlet pipe. The diameter of the shielding cover increases from top to bottom. An opening for the mist droplets to fall is provided at the bottom of the shielding cover. A space for the hot air to flow downward is formed between the shielding cover and the inner wall of the tank body.

2. The coffee powder spray drying device according to claim 1, wherein: The inner wall of the tank body is laterally mounted with a horizontal plate located below the shielding cover, and a scraper is obliquely mounted on the horizontal plate. The scraper passes through the bottom opening of the shielding cover and fits with the inner wall of the shielding cover.

3. The coffee powder spray drying device according to claim 2, wherein: The thickness of the scraper blade gradually becomes thinner toward the inner wall of the shielding cover.

4. The coffee powder spray drying device according to claim 1, wherein: The tank body is also provided with an air guide pipe, which is used for conveying the hot air outputted from the hot air inlet pipe to the middle of the tank body.

5. The coffee powder spray drying device according to claim 4, wherein: The air duct also includes an inlet and an outlet. The inlet is located in the space formed between the shielding cover and the inner wall of the tank body. The outlet is located in the middle of the inner cavity of the tank body. The outlet is also connected to a vertically arranged two-way pipe.

6. The coffee powder spray drying device according to claim 1, wherein: The centrifugal spray tube is covered with a rotating ring on its exterior. A plurality of connecting rods are arranged on the circumference of the outer wall of the rotating ring. The tail ends of the plurality of connecting rods are connected to the top end of the shielding cover.

7. The coffee powder spray drying device according to claim 6, wherein: A support rod is horizontally installed on each of the plurality of connecting rods, a concave plate is installed at the tail end of the support rod, and the inner concave portion of the concave plate is located on the output path of the hot air inlet pipe.

8. The coffee powder spray drying device according to claim 7, wherein: The back of the concave plate is an arc surface.

9. The coffee powder spray drying device according to claim 1, wherein: The inner wall of the shielding cover is coated with an anti-stick coating.

10. A coffee powder spray drying process, applied to the coffee powder spray drying device according to claim 1, characterized in that: The treatment process comprises the following steps: S1. Preheat the interior of the tank through the hot air inlet pipe, and then spray the coffee liquid through the centrifugal spray pipe; S2: The liquid sprayed in step S1 will come into contact with the high temperature inside the tank and evaporate into particles. The large droplets will collide with the inner wall of the shielding cover, forming irregular droplets that spread around and continue to evaporate into particles inside the tank. S3. The hot air discharged from the air inlet pipe will flow through the space formed between the shielding cover and the inner wall of the tank body. During the flow of hot air, negative pressure is formed at the bottom of the shielding cover, and some adhesive materials adhering to the inner wall of the shielding cover are attracted and fall off.

Images