Continuous amylase reaction tank and use method thereof

Abstract

The invention discloses a continuous amylase reaction tank which comprises a shell, a feeding port is formed in the top wall of the shell, a top hole groove is fixedly formed in the inner side of the top wall of the shell and located below the feeding port, an elliptical head is arranged at the bottom of the shell, and a bottom hole plate is arranged between the bottom of the shell and the elliptical head. A discharge hole is formed in the bottom of the elliptical head; a valve is arranged on the discharge hole; a stirring motor is fixedly arranged at the top of the shell, an output shaft of the stirring motor is connected with one end of a stirring shaft, and the other end of the stirring shaft sequentially penetrates through the top wall of the shell, the bottom wall of the top hole groove and the bottom hole plate to be movably connected with a stirrer base arranged on the inner side of the bottom wall of the elliptical head; and a flushing device is arranged in the shell. The invention also discloses a use method of the continuous amylase reaction tank. Starch glue liquid can continuously enter and exit, the production time is saved, and the production efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of papermaking, specifically relating to a continuous amylase reaction tank and a method for using the continuous amylase reaction tank, suitable for the continuous gelatinization of sizing starch on the surface of paper. Background Technology

[0002] Enzyme reaction tanks are a common component of continuous gelatinization processes for sizing starch. They are used to enable starch and amylase to undergo enzymatic reactions. After a certain period of enzymatic reaction, the high molecular weight native starch is degraded into low molecular weight starch, achieving the viscosity requirements for surface sizing. However, most existing sizing starch gelatinization systems in China adopt batch preparation systems. The preparation of starch gelatin solution and the enzymatic reaction are carried out step by step in one tank. That is, a certain amount of water, amylase, and starch are added sequentially in a cooking tank, and then the mixture is stirred and heated. When the temperature reaches the required temperature, it is kept at that temperature for a certain period of time (the holding time is the enzymatic reaction time). Then, the finished product is pumped to a storage tank. The entire preparation process is time-consuming, resulting in low overall capacity of the entire sizing starch gelatinization system. Summary of the Invention

[0003] The purpose of this invention is to provide a continuous amylase reaction tank to address the aforementioned problems in the prior art.

[0004] The above-mentioned objective of the present invention is achieved through the following technical solution: A continuous amylase reaction tank includes a shell, an inlet on the top wall of the shell, a top slot fixedly disposed on the inner side of the top wall of the shell, the top slot being located below the inlet, an elliptical head at the bottom of the shell, a bottom perforated plate between the bottom of the shell and the elliptical head, an outlet at the bottom of the elliptical head, and a valve on the outlet; a stirring motor fixedly disposed on the top of the shell, the output shaft of the stirring motor being connected to one end of a stirring shaft, the other end of the stirring shaft passing sequentially through the top wall of the shell, the bottom wall of the top slot, and the bottom perforated plate, and being movably connected to a stirrer base disposed on the inner side of the bottom wall of the elliptical head, stirring blades being disposed on the stirring shaft, and a rinsing device being disposed inside the tank.

[0005] The top slot bottom and the bottom slot plate are both provided with evenly distributed dispersion holes.

[0006] The stirring blades include an upper stirring blade and a lower stirring blade. The upper stirring blade is located in the top slot, and the lower stirring blade is located in the elliptical head and below the bottom plate.

[0007] Both the upper and lower stirring blades are straight paddle stirring blades.

[0008] The flushing device includes an outer and inner annular flushing pipes and an annular flushing pipe; An inner annular flushing pipe is provided in the top slot. The inner annular flushing pipe is connected to the inner wall of the top slot through a support frame. The inlet of the inner annular flushing pipe is connected to the flushing port of the inner annular pipe located on the top of the shell through a union and a pipe. The inner annular flushing pipe has flushing holes evenly distributed in a circumferential direction facing the inner wall of the top slot. The upper part of the shell is provided with an outer annular flushing pipe, which is connected to the inner side wall of the upper part of the shell through a support frame. The water inlet of the outer annular flushing pipe is connected to the outer annular flushing port located on the top of the shell through a union and a pipe. The outer annular flushing pipe is provided with circumferentially evenly distributed flushing holes facing the inner side wall of the upper part of the shell.

[0009] A level gauge is installed on the elliptical end cap.

[0010] The top of the housing is provided with an exhaust port, and the bottom of the side wall of the housing is provided with a leg support.

[0011] A thermometer is installed on the side wall of the housing.

[0012] The shell has a side manhole on its side wall and a top manhole on its top.

[0013] A method of using the continuous amylase reaction tank as described above includes the following steps: Step 1: Close the valve on the discharge port and inject the starch slurry into the feed port at the top of the shell; Step 2: Turn on the stirring motor to stir the starch slurry; Step 3: After the set time is reached, open the valve on the discharge port to start unloading; Step 4: After preparation, hot water is injected into the shell through the outer ring pipe flushing port and the inner ring pipe flushing port to clean the inside of the shell.

[0014] During the unloading process in step 3, the rate at which the starch adhesive is injected into the feed inlet 503 is the same as the rate at which the starch adhesive is discharged from the outlet.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The preparation of starch solution and enzymatic reaction are carried out simultaneously, and the starch solution is continuously fed into and out of the shell, which improves production capacity and efficiency. 2. By controlling the liquid level, the residence time of the mixture inside the tank can be adjusted, thereby controlling the enzymatic reaction time; 3. Straight-blade paddle mixer blades are used to prevent material agglomeration and avoid mixing of materials. 4. The bottom wall of the top slot is provided with evenly distributed dispersion holes, which can make the material be evenly distributed and also play a buffering role to reduce the falling speed of the material. 5. The bottom perforated plate has evenly distributed small through holes, which allows the material to be fed evenly and can also prevent lumpy impurities from entering the next process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a top view of the structure of the present invention; In the diagram: 1-Agitator; 101-Agitator motor; 102-Upper agitator blade; 103-Agitator shaft; 104-Lower agitator blade; 105-Agitator base; 2-Inner annular flushing pipe; 3-Outer annular flushing pipe; 4-Top slot; 5-Shell; 501-Outer annular flushing port; 502-Inner annular flushing port; 503-Feed inlet; 504-Exhaust port; 505-Side manhole; 506-Thermometer; 507-Level gauge; 508-Discharge port; 509-Leg support; 510-Top manhole; 511-Elliptical end cap; 512-Support frame; 6-Bottom perforated plate. Detailed Implementation

[0017] To facilitate understanding and implementation of the present invention by those skilled in the art, the present invention will be further described in detail below with reference to embodiments. The embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] Example 1: like Figures 1-2 As shown, a continuous amylase reaction tank includes a shell 5 and a stirrer 1. A feed inlet 503 is provided on the top wall of the shell 5. A top slot 4 is fixedly provided on the inner side of the top wall of the shell 5, and the top slot 4 is located below the feed inlet 503. An elliptical end cap 511 is provided at the bottom of the shell 5. A bottom perforated plate 6 is provided between the bottom of the shell 5 and the elliptical end cap 511. A discharge port 508 is provided at the bottom of the elliptical end cap 511. A valve is provided on the discharge port 508. A leg support 509 is provided at the bottom of the side wall of the shell 5.

[0019] In some embodiments, both the bottom of the top slot 4 and the bottom plate 6 are provided with uniformly distributed dispersion holes. The uniformly distributed dispersion holes on the bottom of the top slot 4 allow the material to be fed evenly and also serve as a buffer to reduce the falling speed of the material. The uniformly distributed small through holes on the bottom plate 6 allow the material to be fed evenly and can also prevent blocky impurities from entering the next process. The impurity blocks blocked by the bottom plate 6 are cleaned up during shutdown maintenance.

[0020] The stirrer 1 includes a stirring motor 101, a stirring shaft 103, and stirring blades. The stirring motor 101 is fixedly mounted on the top of the housing 5. The output shaft of the stirring motor 101 is connected to one end of the stirring shaft 103. The other end of the stirring shaft 103 passes through the top wall of the housing 5, the bottom of the top slot 4, and the bottom plate 6 in sequence, and is movably connected to the stirrer base 105 mounted on the inner side of the bottom wall of the elliptical head 511. The stirring blades are mounted on the stirring shaft 103. The movable connection is such that the stirring shaft 103 can rotate relative to the stirring base 105, but the stirring shaft 103 cannot move axially relative to the stirring base 105.

[0021] In some embodiments, the stirring blades include an upper stirring blade 102 and a lower stirring blade 104. The upper stirring blade 102 is located in the top groove 4, and the lower stirring blade 104 is located in the elliptical end cap 511 and below the bottom perforated plate 6.

[0022] In some implementations, both the upper stirring blade 102 and the lower stirring blade 104 are straight paddle stirring blades. When the upper stirring blade 102 stirs the material, it keeps the material in a laminar flow state, preventing the material on the upper layer of the upper stirring blade 102 from mixing with the material on the lower layer of the upper stirring blade 102. When the lower stirring blade 104 stirs the material, it keeps the material in a laminar flow state, preventing the material on the upper layer of the upper stirring blade 104 from mixing with the material on the lower stirring blade 104. The use of straight paddle stirring blades for the upper stirring blade 102 and the lower stirring blade 104 ensures that the material entering the shell 5 at the same time is in the same layer, achieving the effect of first-in-first-out and last-in-last-out.

[0023] In some embodiments, the housing 5 is cylindrical, the ratio of the diameter of the upper stirring blade 102 to the inner diameter of the housing 5 is 0.4 to 0.6, and the ratio of the diameter of the lower stirring blade 104 to the inner diameter of the housing 5 is 0.6 to 0.8. This ratio provides a better stirring effect, is suitable for selecting the stirrer 1, and is also suitable for the floor area and floor height of conventional factory buildings.

[0024] An inner annular flushing pipe 2 is installed inside the top groove 4. The inner annular flushing pipe 2 is connected to the inner wall of the top groove 4 via a support frame 512. The inlet of the inner annular flushing pipe 2 is connected to the inner annular flushing port 502 located on the top of the housing 5 via a union and a pipe. The inner annular flushing pipe 2 has flushing holes evenly distributed circumferentially facing the inner wall of the top groove 4. (During installation, a gap is left between the inner annular flushing pipe 2 and the side wall of the top groove 4 to facilitate flushing.) By injecting hot water into the inner annular flushing port 502, hot water is sprayed out from the inner annular flushing pipe 2 to clean the top groove 4, preventing material from sticking to the top groove 4 or the bottom perforated plate 6.

[0025] An outer annular flushing pipe 3 is provided on the upper part of the shell 5. The outer annular flushing pipe 3 is connected to the upper inner wall of the shell 5 through a support frame 512. The water inlet of the outer annular flushing pipe 3 is connected to the outer annular flushing port 501 located on the top of the shell 5 through a union joint and a pipe. The outer annular flushing pipe 3 has flushing holes evenly distributed around its circumference in the direction of the upper inner wall of the shell 5. (During installation, a gap is left between the outer annular flushing pipe 3 and the upper inner wall of the shell 5 to facilitate flushing.) By injecting hot water into the outer annular flushing port 501, hot water is sprayed out from the outer annular flushing pipe 3 to clean the shell 5, preventing material from sticking to the inner wall of the shell 5 or the bottom perforated plate 6.

[0026] A side manhole 505 is provided on the side wall of the housing 5, and a top manhole 510 is provided on the top of the housing 5. When maintenance is required, the housing 5 can be accessed through the top manhole 510 or the side manhole 505.

[0027] A thermometer 506 is installed on the side wall of the shell 5. Since the material needs to be kept in a specific temperature range during the preparation process, the operator can adjust the relevant process to regulate the temperature inside the shell 5 by observing the thermometer 506 when the temperature inside the shell 5 does not meet the requirements.

[0028] An elliptical end cap 511 is equipped with a level gauge 507. By observing the level gauge 507, the liquid level of the material inside the shell 5 can be known. When the liquid level of the material inside the shell 5 reaches the set value, the valve on the discharge port 508 is opened to start unloading, thereby controlling the residence time of the material inside the shell 5.

[0029] The top of the housing 5 is provided with an exhaust port 504, which can keep the pressure inside the housing 5 within a safe range.

[0030] In some embodiments, the rotational speed of the stirring motor 101 is 50~70 r / min. In this embodiment, the rotational speed of the stirring motor 101 is 60 r / min. At this speed, it can play a role in preventing condensation and also ensure that the output power of the stirring motor 101 is kept at a low level, thereby reducing the power consumption of the stirring motor 101.

[0031] Example 2: The present invention also provides a method for using the continuous amylase reaction tank described in Example 1, comprising the following steps: Step 1: Close the valve on the discharge port 508 and inject the starch slurry into the feed port 503 at the top of the housing 5; The starch solution is obtained by mixing starch, water, and enzymes in a set ratio in the previous process, and then heating it with steam to a set temperature.

[0032] Step 2: Turn on the stirring motor 101 to stir the starch slurry; After the starch slurry is injected into the housing 5 through the inlet 503, the stirring motor 101 is turned on. The starch slurry first falls into the top groove 4 fixed on the inner side of the top wall of the housing 5. At this time, the starch slurry undergoes the first stirring under the action of the upper stirring blade 102. After the first stirring, the starch slurry flows out from the dispersion hole set at the bottom of the top groove 4 and falls evenly onto the bottom perforated plate 6. Then, it falls evenly into the elliptical end cap 511 through the dispersion hole set on the bottom perforated plate 6. Since the valve on the outlet 508 is in the closed state, the discharge stops at this time. As the starch slurry is continuously injected, the liquid level of the starch slurry inside the housing 5 continues to rise, and the starch slurry undergoes a second stirring under the action of the lower stirring blade 104.

[0033] Step 3: After the set time is reached, open the valve on the discharge port 508 to start unloading; During the preparation process, the level of starch slurry in the shell 5 can be determined by observing the level gauge 507. When the level of starch slurry in the shell 5 reaches the set value, the valve on the discharge port 508 is opened to start unloading. During the unloading process, the rate at which starch slurry is injected into the inlet 503 is kept the same as the rate at which starch slurry is discharged from the outlet 508, so that the enzymatic reaction time of all starch slurry in the shell 5 is the same.

[0034] Step 4: After unloading, hot water is injected into the inside of the shell 5 through the outer ring pipe flushing port 501 and the inner ring pipe flushing port 502 to clean the inside of the shell 5.

[0035] The preparation is completed after unloading. After the preparation is completed, the temperature inside the shell 5 will decrease. As the temperature inside the shell 5 decreases, the viscosity of the starch adhesive residue inside the shell 5 will increase. If it is not cleaned in time, it will stick to the inside of the shell 5. After the preparation is completed, hot water is injected into the inside of the shell 5 through the outer ring flushing port 501 and the inner ring flushing port 502 to clean the inside of the shell 5. The inner ring flushing pipe 2 is connected to the inner ring flushing port 502. The hot water sprayed from the inner ring flushing port 502 will flush the top slot 4 and the bottom perforated plate 6. The outer ring flushing pipe 3 is connected to the outer ring flushing port 501. The hot water sprayed from the outer ring flushing port 501 will clean the inner wall of the shell 5 and the inner wall of the elliptical end cap 511.

[0036] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A continuous amylase reaction tank, comprising a shell (5), characterized in that, A feed inlet (503) is provided on the top wall of the shell (5). A top slot (4) is fixedly provided on the inner side of the top wall of the shell (5). The top slot (4) is located below the feed inlet (503). An elliptical end cap (511) is provided at the bottom of the shell (5). A bottom perforated plate (6) is provided between the bottom of the shell (5) and the elliptical end cap (511). A discharge port (508) is provided at the bottom of the elliptical end cap (511). A valve is provided on the discharge port (508). A stirring motor (101) is fixedly provided at the top of the shell (5). The output shaft of the stirring motor (101) is connected to one end of the stirring shaft (103). The other end of the stirring shaft (103) passes through the top wall of the shell (5), the bottom wall of the top slot (4), and the bottom perforated plate (6) in sequence and is movably connected to the stirrer base (105) provided on the inner side of the bottom wall of the elliptical end cap (511). The stirring blades are provided on the stirring shaft (103). A flushing device is provided inside the tank (5).

2. The continuous amylase reaction tank according to claim 1, characterized in that, The top slot (4) and the bottom slot plate (6) are both provided with evenly distributed dispersion holes.

3. The continuous amylase reaction tank according to claim 1, characterized in that, The stirring blades include an upper stirring blade (102) and a lower stirring blade (104). The upper stirring blade (102) is located in the top slot (4), and the lower stirring blade (104) is located in the elliptical head (511) and below the bottom perforated plate (6).

4. A continuous amylase reaction tank according to claim 3, characterized in that, Both the upper stirring blade (102) and the lower stirring blade (104) are flat paddle stirring blades.

5. A continuous amylase reaction tank according to claim 1, characterized in that, The flushing device includes an outer and inner annular flushing pipe (2) and an annular flushing pipe (3). An inner annular flushing pipe (2) is provided in the top groove (4). The inner annular flushing pipe (2) is connected to the inner wall of the top groove (4) through a support frame (512). The inlet of the inner annular flushing pipe (2) is connected to the inner annular flushing port (502) provided at the top of the shell (5) through a union and a pipe. The inner annular flushing pipe (2) has flushing holes evenly distributed in the circumferential direction facing the inner wall of the top groove (4). The upper part of the housing (5) is provided with an outer ring flushing pipe (3). The outer ring flushing pipe (3) is connected to the upper inner wall of the housing (5) through a support frame (512). The water inlet of the outer ring flushing pipe (3) is connected to the outer ring flushing port (501) provided on the top of the housing (5) through a union and a pipe. The outer ring flushing pipe (3) is provided with flushing holes evenly distributed in the circumferential direction towards the upper inner wall of the housing (5).

6. A continuous amylase reaction tank according to claim 5, characterized in that, A level gauge (507) is provided on the elliptical head (511).

7. A continuous amylase reaction tank according to claim 1, characterized in that, The top of the housing (5) is provided with an exhaust port (504), and the bottom of the side wall of the housing (5) is provided with a leg support (509).

8. A continuous amylase reaction tank according to claim 1, characterized in that, A thermometer (506) and a side manhole (505) are provided on the side wall of the housing (5), and a top manhole (510) is provided on the top of the housing (5).

9. A method of using a continuous amylase reaction tank, utilizing the continuous amylase reaction tank according to claim 6, characterized in that, Includes the following steps: Step 1: Close the valve on the discharge port (508) and inject the starch slurry into the feed port (503) at the top of the shell (5). Step 2: Turn on the stirring motor (101) to stir the starch slurry; Step 3: After the set time is reached, open the valve on the discharge port (508) to start unloading; Step 4: After unloading, hot water is injected into the shell (5) through the outer ring pipe flushing port (501) and the inner ring pipe flushing port (502) to clean the inside of the shell (5).

10. The method of using a continuous amylase reaction tank according to claim 9, characterized in that, During the unloading process in step 3, the rate at which the starch slurry is injected into the feed inlet (503) is the same as the rate at which the starch slurry is discharged from the discharge outlet (508).

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