A preheating mixing tank

Abstract

The utility model relates to yeast drying technical field, preheating stirring jar includes jar body, is equipped with stirring shaft in the jar body, is equipped with heat exchange pipe in the jar body, the jar body includes the cover plate of cylinder body and located cylinder body bottom, the cylinder body is equipped with interlayer, is equipped with cold water pipe in the interlayer, and the cold water pipe is coiled in the cylinder body, and the periphery of interlayer is equipped with insulating layer, the outside of jar body is connected with water inlet pipe, backwater pipe, the upper portion of jar body still is connected with overflow pipe, is equipped with first valve on the overflow pipe, is connected with the flush pipe between water inlet pipe and overflow pipe, is equipped with second valve on the flush pipe, is equipped with third valve on water inlet pipe. The jar body is equipped with interlayer, is equipped with cold water pipe in the interlayer, through the injection cold water, can play the role of cooling, through the coordinated control of control system to the heat exchange pipe heating and cold water pipe's cooling in the jar body, make the material liquid in the jar body be in the temperature interval that sets, relatively constant, and under the stirring of stirring mechanism material liquid is also relatively uniform. Preheating stirring jar still has overflow, flush and so on function.

Description

Technical Field

[0001] This utility model relates to the field of yeast drying technology, specifically to a preheating stirring tank. Background Technology

[0002] There are two main types of brewer's yeast dryers: drum scraper dryers and spray dryers. Drum scraper dryers use steam to indirectly heat a uniformly rotating drum. Liquid yeast forms a thin film on the drum surface, and moisture is rapidly evaporated. The dried material is then scraped off by a scraper. A preheating tank is installed before the drying drum. Preheating reduces the viscosity of the yeast slurry. The preheating tank heats the liquid to a relatively high temperature (e.g., 60-70°C), effectively completing the "preheating" stage. The dryer only needs to handle the final "moisture evaporation" stage, which greatly improves the dryer's efficiency and reduces energy consumption. The condensate produced by the dryer is a large quantity of high-temperature, high-quality water and heat resources. The applicant's prior patent, such as the authorized publication number CN 206050573 U, discloses a novel yeast storage tank that transports the condensate to the heat exchange tubes of the preheating tank via pipelines. However, this system only heats the yeast stock solution in the preheating tank, resulting in fluctuating temperatures. Once the product enters the dryer, the dryer's operating parameters need constant adjustment; otherwise, one batch of products will be over-dried while another is under-dried. The current preheating tank has limited functionality and requires further optimization. Utility Model Content

[0003] The purpose of this invention is to provide a preheating mixing tank that, through structural optimization, heats the yeast stock solution while maintaining a relatively constant temperature, and adds other functions.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A preheating mixing tank includes a tank body with a stirring shaft inside. The tank body has a feed inlet at the top and a discharge outlet at the bottom. A heat exchange tube is installed inside the tank body. The tank body includes a cylindrical body and a cover plate located at the bottom of the cylindrical body. The cylindrical body has a jacket with a cold water pipe coiled around the cylindrical body. An insulation layer is provided around the jacket. An inlet water pipe and a return water pipe are connected to the outside of the tank body, which are respectively connected to the inlet and outlet of the cold water pipe. An overflow pipe is also connected to the upper part of the tank body. A first valve is installed on the overflow pipe. A flushing pipe is connected between the inlet water pipe and the overflow pipe. A second valve is installed on the flushing pipe. A third valve is installed on the inlet water pipe. The third valve is located downstream of the connection point between the flushing pipe and the inlet water pipe.

[0005] Furthermore, a contact thermal probe is inserted into the bottom of the tank to detect the temperature of the liquid inside the tank.

[0006] Furthermore, the heat exchange tube is a coil, which is fixed inside the cylinder by a support. The two ends of the heat exchange tube are a heat source inlet and a heat source outlet, respectively, for introducing steam or hot water. The heat source inlet and heat source outlet are located on the upper and lower sides of the tank, respectively.

[0007] Furthermore, a high / low liquid level alarm is installed on the outside of the tank.

[0008] Furthermore, the feed inlet is located on the cover plate, and the stirring shaft is driven by a motor, which is also located on the cover plate. The motor is a variable frequency motor.

[0009] Furthermore, the cover plate is provided with an inspection port, and an inspection cover is bolted to the outer periphery of the inspection port.

[0010] Furthermore, the lower part of the tank is provided with support legs, the outside of the tank is provided with a ladder, and the upper side of the cover is provided with a protective railing.

[0011] Furthermore, the bottom of the tank is a conical part, and the discharge port is located at the constriction of the conical part. The discharge port is connected to the buffer liquid tank through a discharge pipe, and a fourth valve is provided on the discharge pipe.

[0012] Furthermore, a float valve is connected to the end of the discharge pipe, and the float valve floats on the liquid in the buffer tank.

[0013] Furthermore, a feed pipe is connected to the bottom of the buffer tank for connecting to the yeast dryer.

[0014] The beneficial effects of this utility model are: This utility model discloses a preheating mixing tank with a jacketed structure containing a cold water pipe coiled inside the cylinder and located within the insulation layer. An inlet and outlet water pipe are connected to the outer side of the tank, respectively connecting to the inlet and outlet of the cold water pipe. Injecting cold water achieves a cooling effect. A control system coordinates the heating of the heat exchange tubes within the tank and the cooling of the cold water pipe, along with the stirring mechanism, ensuring the liquid inside the tank remains relatively constant within a set temperature range. Maintaining a constant temperature of the liquid entering the yeast dryer is crucial for ensuring a stable drying process and consistent moisture content in the finished product. Furthermore, an overflow pipe connected to the tank provides overflow. A flushing pipe is further connected between the overflow pipe and the cold water inlet pipe. The opening and closing of corresponding valves on the pipe control whether cold water flows into the cold water pipe for cooling or flows into the tank via the flushing pipe and overflow pipe for cleaning. The flushing pipeline has a compact structure, combining a cold water inlet pipe and an overflow pipe, instead of designing a separate pipeline system. It achieves multiple functions through valve control. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the structure of the preheating mixing tank of this utility model; Figure 2 This is a top view of the preheating mixing tank of this utility model; Figure 3 This is a schematic diagram of the cold water pipe arrangement of the preheating mixing tank of this utility model.

[0016] 1. Tank body; 11. Cylinder body; 12. Cover plate; 13. Feed inlet; 14. Discharge outlet; 15. Inspection cover; 2. Heat exchanger tube; 21. Heat source inlet; 22. Heat source outlet; 31. Motor; 32. Agitator shaft; 4. High and low liquid level alarm; 5. Contact thermal probe; 51. Guardrail; 52. Ladder; 61. Buffer liquid tank; 62. Float valve; 63. Feeding pipe; 71. Water inlet pipe; 72. Overflow pipe; 73. Return water pipe; 74. Flushing pipe; 75. Discharge pipe; 81. First valve; 82. Second valve; 83. Third valve; 84. Fourth valve; 9. Cold water pipe. Detailed Implementation The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0017] Embodiments of this utility model: like Figures 1 to 3 As shown, the preheating mixing tank includes a tank body 1, a stirring shaft 32 inside the tank body 1, a feed inlet 13 at the top of the tank body 1, and a discharge outlet 14 at the bottom. A heat exchange tube 2 is installed inside the tank body 1 for preheating the yeast stock solution inside the tank body 1, the purpose of which has been explained in the background section. The above is a relatively conventional method; however, the following optimized design has been implemented in this embodiment.

[0018] The heat exchange tube 2 is a coil, fixed inside the tank 1 by a support member welded to the inner wall of the tank 1. The two ends of the heat exchange tube 2 are a heat source inlet 21 and a heat source outlet 22, used for introducing steam or hot water. The heat source inlet 21 and heat source outlet 22 are located on the upper and lower sides of the tank 1, respectively. Using a coil, the stirring shaft 32 is located in the central space, without affecting the stirring function. The heat exchange of the coil is more uniform compared to the tube structure used in the patent cited in the background art. Hot water can be introduced, using existing technology, i.e., the condensate from steam in a yeast dryer. The temperature is relatively high, which can be fully utilized to preheat the original liquid in the stirring tank. Of course, in other embodiments, steam can also be used, as yeast dryers require steam, thus providing a readily available steam heat source.

[0019] The tank 1 includes a cylindrical body 11 and a cover plate 12 located at the bottom of the cylindrical body 11. The cylindrical body 11 has a jacket, within which a cold water pipe 9 is installed. The cold water pipe 9 is also a coil, coiled around the cylindrical body 11. An inlet pipe 71 and a return pipe 73 are connected to the outside of the tank 1, respectively connected to the inlet and outlet of the cold water pipe 9. By injecting cold water, a cooling effect is achieved. Through the coordinated control of heating and cooling by the control system, the liquid in the tank 1 is kept relatively constant within a set temperature range. Maintaining a constant temperature of the liquid entering the yeast dryer is crucial for ensuring a stable drying process and consistent moisture content in the finished product.

[0020] An insulation layer is provided on the outside of the interlayer, which can be made of insulation cotton.

[0021] A contact-type thermal probe 5 is inserted into the bottom of the tank 1 to detect the temperature of the liquid inside the tank 1, such as a thermocouple or resistance temperature detector. During operation, the temperature data is fed back to the controller in real time, which controls whether cold water is supplied (mainly for heating the inside of the tank 1, and only needs to be appropriately cooled when the temperature is high) and regulates the flow rate of the cold water. A solenoid valve is installed on the cold water inlet pipe 71, which can realize the on / off of water and regulate the flow rate through the flow valve.

[0022] An overflow pipe 72 is connected to the upper part of the tank 1. The overflow pipe 72 is used to drain excess liquid from the tank 1 when the liquid level exceeds a set line. A first valve 81 is installed on the overflow pipe 72. A flushing pipe 74 is connected between the inlet pipe 71 and the overflow pipe 72, and a second valve 82 is installed on the flushing pipe 74. The flushing pipe 74 is only used when cleaning and maintenance of the tank 1 is required. A third valve 83 is installed on the inlet pipe 71. The third valve 83 is located between the tank 1 and the connection point between the flushing pipe 74 and the inlet pipe 71, i.e., close to the tank 1. If the connection point between the flushing pipe 74 and the inlet pipe 71 is defined as A, and the connection point between the inlet pipe 71 and the tank 1 is defined as B, then the third valve 83 is located between A and B.

[0023] The bottom of tank 1 is conical, and the discharge port 14 is located at the constriction of the conical section. The discharge port 14 is connected to the buffer liquid tank 61 through a discharge pipe 75, which is equipped with a fourth valve 84. The jacket and the cold water pipe 9 installed therein are only located in the circular cylindrical part 11, and are not included in the conical part to reduce installation difficulty. The liquid can be relatively uniform through stirring inside tank 1. An insulation layer can be installed on the outside of the conical part.

[0024] The first valve 81, the second valve 82, the third valve 83, and the fourth valve 84 are all solenoid valves, which can be operated on a control panel connected to the controller to control the opening and closing of the corresponding valves; in other embodiments, the first valve 81 and the fourth valve 84 can also be manual valves. Under normal circumstances, the third valve 83 is closed, i.e., a normally closed valve. The first valve 81 is a normally open valve, and the second valve 82 is a normally closed valve. When cold water needs to be injected, the third valve 83 is opened. When it is necessary to clean the inside of the tank 1, the third valve 83, the first valve 81, and the fourth valve 84 are closed, and the second valve 82 is opened. Cold water can enter the tank 1 through the flushing pipe 74 and the overflow pipe 72, and enter the tank 1 through the end of the overflow pipe 72 located inside the tank. After a certain amount of water is introduced into the tank 1, the third valve 83 is closed. The stirring shaft 32 rotates, and the bottom of the stirring shaft 32 is equipped with stirring blades, which agitate the internal liquid and clean the inner wall of the cylinder, the heat exchange tube 2, and the blades. After the first cleaning liquid is discharged, the above steps can be repeated for a second cleaning.

[0025] The feed inlet 13 is located on the cover plate 12. The stirring shaft 32 is driven by the motor 31, which is also located on the cover plate 12. The motor 31 is inverted to drive the coaxial stirring shaft 32. The motor 31 is supported on the cover plate 12 by a motor 31 support frame. The motor 31 is a variable frequency motor, and the stirring speed can be adjusted as needed.

[0026] The cover plate 12 is provided with an inspection port. An inspection cover 15 is bolted to the outer periphery of the inspection port. When the inspection cover 15 is opened, workers can check the internal condition through the inspection port. The tank body 1 is large in volume, so workers can also enter to carry out maintenance.

[0027] The lower part of the tank body 1 is equipped with support legs, and a ladder 52 is provided on the outside of the tank body 1. A guardrail 51 is provided on the upper side of the cover plate 12. The guardrail 51 is made of welded steel pipes and has an entrance that connects with the top of the ladder 52. Maintenance workers can climb to the top of the tank body 1 from the ladder 52. The guardrail 51 provides protection and improves the safety of the operation.

[0028] Figure 1 As shown, a high / low liquid level alarm 4 is installed on the outside of the tank 1, fixed along the height of the tank. Its two connecting ends are connected to the inside of the tank. The high / low liquid level alarm 4 is existing technology and can be a magnetic float level gauge, etc. If the liquid level inside the tank 1 is too high or too low, it can send a message to the control terminal.

[0029] A float valve 62 is connected to the end of the discharge pipe 75. The float valve 62 floats on the liquid in the buffer tank 61 and is used to control the liquid level in the buffer tank 61. When the liquid level where the float of the float valve 62 is located is higher than the set position, the discharge pipe 75 is closed and the discharge stops. As the liquid is used, the liquid level drops and the float follows. When it drops to the set position, the discharge pipe 75 is reopened.

[0030] The bottom of the buffer tank 61 is connected to a feed pipe 63, which is used to connect to the yeast dryer and supply the dryer with the yeast slurry for drying. The combination of the preheating tank and the buffer tank 61 can serve as an intermediate buffer container to temporarily store a certain amount of yeast slurry, ensuring that the dryer can feed continuously and stably, thus guaranteeing the continuity of production.

[0031] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A preheating mixing tank, comprising a tank body, a stirring shaft disposed within the tank body, a feed inlet at the top of the tank body and a discharge outlet at the bottom, and heat exchange tubes disposed within the tank body, characterized in that: The tank includes a cylindrical body and a cover plate located at the bottom of the cylindrical body. The cylindrical body has a jacket with a cold water pipe coiled around it. An insulation layer is provided around the jacket. An inlet pipe and a return pipe are connected to the outside of the tank, which are respectively connected to the inlet and outlet of the cold water pipe. An overflow pipe is also connected to the upper part of the tank. A first valve is provided on the overflow pipe. A flushing pipe is connected between the inlet pipe and the overflow pipe. A second valve is provided on the flushing pipe. A third valve is provided on the inlet pipe. The third valve is located downstream of the connection point between the flushing pipe and the inlet pipe.

2. The preheating mixing tank according to claim 1, characterized in that: A contact thermal probe is inserted into the bottom of the tank to detect the temperature of the liquid inside the tank.

3. The preheating mixing tank according to claim 1, characterized in that: The heat exchange tube is a coil, which is fixed inside the cylinder by a support. The two ends of the heat exchange tube are the heat source inlet and the heat source outlet, respectively, for introducing steam or hot water. The heat source inlet and the heat source outlet are located on the upper and lower sides of the tank, respectively.

4. The preheating mixing tank according to claim 1, characterized in that: The tank is equipped with high and low liquid level alarms on its outer side.

5. The preheating mixing tank according to claim 1, characterized in that: The feed inlet is located on the cover plate, and the stirring shaft is driven by a motor, which is also located on the cover plate. The motor is a variable frequency motor.

6. The preheating mixing tank according to claim 5, characterized in that: The cover plate is provided with an inspection port, and an inspection cover is bolted to the outer periphery of the inspection port.

7. The preheating mixing tank according to claim 6, characterized in that: The lower part of the tank is equipped with support legs, the outside of the tank is equipped with a ladder, and the upper side of the cover is equipped with a guardrail.

8. The preheating mixing tank according to claim 1, characterized in that: The bottom of the tank is conical, and the discharge port is located at the constriction of the conical part. The discharge port is connected to the buffer liquid tank through a discharge pipe, and a fourth valve is provided on the discharge pipe.

9. The preheating mixing tank according to claim 8, characterized in that: The end of the discharge pipe is connected to a float valve, which floats on the liquid in the buffer tank.

10. The preheating mixing tank according to claim 9, characterized in that: The bottom of the buffer tank is connected to a feeding pipe for connecting to the yeast dryer.

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