Phosphoric acid automatic adding system for sugar preparation process by means of sub-method

Abstract

The utility model discloses an automatic phosphoric acid adding system for a sub-sugar process, which comprises a phosphoric acid storage unit used for storing strong phosphoric acid or dilute phosphoric acid; the conveying unit is connected with the phosphoric acid storage unit, and the conveying unit is used for conveying the strong phosphoric acid or the dilute phosphoric acid in the phosphoric acid storage unit to the mixed juice clarifying unit; the metering unit is arranged on the conveying pipeline of the conveying unit, and the metering unit is used for detecting the speed of conveying the strong phosphoric acid or the dilute phosphoric acid by the conveying unit; the control unit is electrically connected with the conveying unit and the metering unit respectively, and the control unit is used for receiving the speed data, detected by the metering unit, of the strong phosphoric acid or the dilute phosphoric acid and controlling the conveying flow of the conveying unit. According to the automatic phosphoric acid adding system, strong phosphoric acid or dilute phosphoric acid can be automatically added into sugarcane juice according to a preset proportion, the accuracy of phosphoric acid adding is guaranteed, and the automatic phosphoric acid adding system belongs to the technical field of sugar manufacturing processes.

Description

Technical Field

[0001] The utility model belongs to the technical field of sugar making process, and particularly relates to an automatic phosphoric acid adding system for a sub-method sugar making process. Background Art

[0002] Phosphoric acid is a raw material frequently used in chemical, light and food production processes. It is mainly used to adjust the acidity of materials. Some are used as clarifiers. For example, sugarcane sugar factories or beet sugar factories use phosphoric acid for flotation clarification processes. The phosphoric acid flotation clarification process uses the fact that some organic substances in cane juice, such as sugarcane fat, sugarcane wax, starch, pectin, some polysaccharides and polyphenols, are insoluble under low temperature conditions. Phosphoric acid, a small amount of lime milk, flocculants and bubbles are added to the mixed juice. A large amount of organic non-sugars are first removed under neutral conditions by coagulation, flotation and adsorption. Then, the carbonation clarification process is used to remove pigments and other non-sugars in the sugar juice.

[0003] In the process of sugarcane sugar production, whether the amount of calcium phosphate produced by the reaction of phosphoric acid and lime is stable not only affects the removal rate of colloids, non-sugars and pigments, but also affects the formation effect of sulfite. In addition, calcium phosphate promotes flocculation and precipitation. For a long time, the proportion of phosphoric acid in sugar factories has mainly relied on manual proportioning, and phosphoric acid is added according to a fixed valve position or pump opening degree. However, the manual dilution of phosphoric acid is difficult to ensure the accuracy of phosphoric acid addition, and the error is large. Utility Model Content

[0004] The utility model aims to provide an automatic phosphoric acid adding system for the sub-method sugar making process, so as to solve the problem that the manual phosphoric acid dilution method is difficult to ensure the accuracy of phosphoric acid addition and has large errors.

[0005] The specific technical solutions are as follows:

[0006] An automatic phosphoric acid adding system for a sub-method sugar production process, comprising:

[0007] A phosphoric acid storage unit, used for storing concentrated phosphoric acid or dilute phosphoric acid;

[0008] A conveying unit, the conveying unit is connected to the phosphoric acid storage unit, and the conveying unit is used to convey the concentrated phosphoric acid or the diluted phosphoric acid in the phosphoric acid storage unit to the mixed juice clarification unit;

[0009] A metering unit, which is arranged on a delivery pipeline of the delivery unit and is used to detect a speed at which the delivery unit delivers concentrated phosphoric acid or diluted phosphoric acid;

[0010] and a control unit, which is electrically connected to the conveying unit and the metering unit respectively, and is used to receive the speed data of concentrated phosphoric acid or diluted phosphoric acid detected by the metering unit, and to control the conveying flow rate of the conveying unit.

[0011] Preferably, the delivery unit includes a first delivery pump, a second delivery pump and a delivery pipeline, the first delivery pump and the second delivery pump are both electrically connected to the control unit, the inlet of the first delivery pump is connected to the phosphoric acid storage unit through the delivery pipeline, and the outlet of the first delivery pump is connected to the mixed juice clarification unit through the delivery pipeline; the inlet of the second delivery pump is connected to the phosphoric acid storage unit through the delivery pipeline, and the outlet of the second delivery pump is connected to the mixed juice clarification unit through the delivery pipeline, and the second delivery pump is arranged in parallel with the first delivery pump.

[0012] Preferably, the first delivery pump and the second delivery pump are both magnetic pumps, and the outlets and inlets of the first delivery pump and the second delivery pump are both provided with self-locking joints.

[0013] Preferably, the metering unit is an electromagnetic flowmeter.

[0014] Preferably, the phosphoric acid storage unit is a cubic container or a cylindrical container, and a liquid level meter is provided on the phosphoric acid storage unit, and the liquid level meter is electrically connected to the control unit.

[0015] Preferably, a first temperature sensor is also provided on the phosphoric acid storage unit, and the first temperature sensor is electrically connected to the control unit.

[0016] Preferably, the control unit includes a PLC controller, a touch screen and a frequency converter, the PLC controller is electrically connected to the metering unit, the touch screen is electrically connected to the PLC controller, the frequency converter is electrically connected to the PLC controller, the frequency converter is connected to a 220V power supply, and the frequency converter is electrically connected to the conveying unit.

[0017] Preferably, an automatic phosphoric acid adding system for the sub-method sugar production process further includes a first heating unit, which is connected to the control unit and is used to heat the concentrated phosphoric acid or the dilute phosphoric acid in the phosphoric acid storage unit.

[0018] Preferably, the first heating unit includes a heating container, a heating tube, a power module, an air pump, a hot air pipe and a second temperature sensor. The heating container is a closed structure. The heating tube is inserted into the heating container. The air pump is connected to the heating container through a pipeline. The power module is electrically connected to the heating tube, the power module is electrically connected to the control unit, one end of the hot air pipe is connected to the heating container, and the other end of the hot air pipe is connected to the phosphoric acid storage unit. The second temperature sensor is arranged in the heating container to detect the air temperature in the heating container.

[0019] Preferably, an automatic phosphoric acid addition system for a sub-method sugar production process further comprises a second heating unit, the second heating unit comprising a heating belt and an insulation layer, the heating belt is wrapped around the outside of a conveying pipe of the conveying unit, and the insulation layer is wrapped around the outside of the conveying pipe wrapped around the heating belt.

[0020] Compared with the existing technology, the utility model has the following beneficial effects:

[0021] 1. The automatic phosphoric acid adding system of the sub-method sugar making process of the utility model has high accuracy. It reduces the error caused by dilution by direct addition without adding water. It has high addition accuracy (better than 0.2%) and saves energy. It is convenient for process personnel to adjust the process by directly inputting the addition ratio ppm, ensuring the stability of the process and improving the quality of the product. At the same time, no special person is required for operation.

[0022] 2. The automatic phosphoric acid adding system of the sub-method sugar making process of the utility model can use bulk phosphoric acid, which has a high utilization rate of phosphoric acid (it was previously packed in barrels and could not be completely poured out at low temperatures), without additional loading and discharging costs, and at the same time, the cost of bulk phosphoric acid is low, thus greatly reducing production costs.

[0023] 3. The direct addition of ingredients in the workshop without dilution improves production safety, the conveying system is completely leak-free and maintenance-free, and is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0025] Figure 1 Schematic diagram of the automatic phosphoric acid addition system.

[0026] Description of main reference numerals:

[0027] 1 is a phosphoric acid storage unit, 2 is a first heating unit, 3 is a remote control system, 4 is a control unit, 5 is a first delivery pump, 6 is a second delivery pump, 7 is a metering unit, 8 is a mixed juice clarification unit, and 9 is a mixed juice flow meter. DETAILED DESCRIPTION

[0028] 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.

[0029] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inside", "outside", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is a description of the embodiments of the present invention based on its overall structure.

[0032] Mixed juice refers to the sugarcane juice squeezed out of the sugar mill. The addition of phosphoric acid in the sugar mill of the sub-method sugar making process is an important process. In the past, it was added manually, which affected the product quality and economic benefits. The reasons are:

[0033] 1. Due to the different liquid levels, the delivery flow rate of the delivery pump at the same speed is different.

[0034] 2. Phosphoric acid dilution is manual and has large errors.

[0035] like Figure 1 As shown, this embodiment provides an automatic phosphoric acid adding system for the sub-method sugar production process, comprising:

[0036] A phosphoric acid storage unit 1 is used to store concentrated phosphoric acid or dilute phosphoric acid; the phosphoric acid storage unit 1 is a cubic container or a cylindrical container, and a liquid level gauge is provided on the phosphoric acid storage unit 1, and the liquid level gauge is electrically connected to a control unit 4; the phosphoric acid storage unit 1 of this embodiment is a cylindrical container, and a liquid outlet is provided on one side of the cylindrical container for connection with a delivery pipeline to facilitate the first delivery pump 5 or the second delivery pump 6 to extract the concentrated phosphoric acid or dilute phosphoric acid in the cylindrical container; an opening is provided on the top of the cylindrical container to facilitate the addition of concentrated phosphoric acid or dilute phosphoric acid from the outside, and the liquid level gauge is used to detect the relative height of the liquid level of the concentrated phosphoric acid or dilute phosphoric acid in the cylindrical container.

[0037] The mixed juice clarification unit 8 is a container for placing mixed juice. The mixed juice clarification unit 8 receives the mixed juice squeezed by the sugar factory. A mixed juice flowmeter 9 is provided at the receiving end to detect the flow rate. The mixed juice flowmeter 9 is electrically connected to the control unit 4 .

[0038] A conveying unit, the conveying unit is connected to the phosphoric acid storage unit 1, and the conveying unit is used to convey the concentrated phosphoric acid or dilute phosphoric acid in the phosphoric acid storage unit 1 to the mixed juice clarification unit 8; the conveying unit includes a first delivery pump 5, a second delivery pump 6 and a delivery pipeline, the first delivery pump 5 and the second delivery pump 6 are both electrically connected to the control unit 4, the inlet of the first delivery pump 5 is connected to the phosphoric acid storage unit 1 through the delivery pipeline, and the outlet of the first delivery pump 5 is connected to the mixed juice clarification unit 8 through the delivery pipeline; the inlet of the second delivery pump 6 is connected to the phosphoric acid storage unit 1 through the delivery pipeline, and the outlet of the second delivery pump 6 is connected to the mixed juice clarification unit 8 through the delivery pipeline, and the second delivery pump 6 is arranged in parallel with the first delivery pump 5. The first delivery pump 5 and the second delivery pump 6 are both magnetic pumps. The outlets of the first delivery pump 5 and the second delivery pump 6 are connected through a pipeline capable of conveying phosphoric acid. The pipeline connection of the two is connected by a tee, and the tee is provided with a self-locking joint. The inlet of the first delivery pump 5 and the second delivery pump 6 is connected through a pipeline capable of conveying phosphoric acid. The pipeline connection of the two is connected by a tee, and the tee is provided with a self-locking joint, so that the first delivery pump 5 and the second delivery pump 6 are connected in parallel. The first delivery pump 5 and the second delivery pump 6 can convey high specific gravity liquids and have the advantages of corrosion resistance and no leakage. The self-locking joint is convenient for connecting the corresponding delivery pipelines to ensure that there is no leakage at the connection between the first delivery pump 5 and the second delivery pump 6 and the delivery pipeline. Since the process step of adding phosphoric acid is very important in the sugar production process, in order to ensure the quality of sugar production, the addition of phosphoric acid cannot be stopped during the production process. Therefore, by setting the first delivery pump 5 and the second delivery pump 6 in parallel, when one of them has a problem, phosphoric acid can be continued to be conveyed to the mixed juice through another parallel delivery pump to ensure that the step of adding phosphoric acid is always in progress, and the product quality of sugar production is guaranteed. It should be noted that, since the delivery pipeline is connected with the self-locking joint, the whole system is leak-free and does not require daily maintenance. In addition, valves are provided between the first delivery pump 5 and the second delivery pump 6 and the phosphoric acid storage unit 1, and valves are provided between the first delivery pump 5 and the second delivery pump 6 and the mixed juice clarification unit 8.

[0039] The metering unit 7 is arranged on the delivery pipeline of the delivery unit, and is used to detect the speed at which the delivery unit delivers concentrated phosphoric acid or diluted phosphoric acid; specifically, the metering unit 7 is an electromagnetic flowmeter, which can detect the flow rate of the phosphoric acid delivered by the first delivery pump 5 or the second delivery pump 6 with high precision.

[0040] And a control unit 4, the control unit 4 is electrically connected to the conveying unit and the metering unit 7 respectively, the control unit 4 is used to receive the speed data of concentrated phosphoric acid or diluted phosphoric acid detected by the metering unit 7, and is used to control the conveying flow rate of the conveying unit. The control unit 4 includes a PLC controller, a touch screen and a frequency converter, the PLC controller is electrically connected to the metering unit 7, the touch screen is electrically connected to the PLC controller, the frequency converter is electrically connected to the PLC controller, the frequency converter is connected to a 220V power supply, and the frequency converter is electrically connected to the conveying unit. Specifically, the frequency converter is a 220V or 380V frequency converter, and the two conveying pumps of the conveying unit are three-phase 220V or 380V. During use, the frequency converter is powered by a single-phase 220V and outputs three-phase electricity to the two conveying pumps of the conveying unit. By adjusting the frequency of the frequency converter, the flow rate delivered by the conveying pump can be accurately controlled. In addition, the control unit 4 also includes an external control button and an indicator light, both of which are electrically connected to the PLC controller. The external control button allows the user to send instructions to the PLC controller to control corresponding electrical components, and the indicator light allows the user to know the operating status.

[0041] It should be noted that the control unit 4 can be connected to an external remote control system 3 , and the external remote control system 3 can remotely control the control unit 4 .

[0042] The automatic phosphoric acid adding system of the sub-method sugar making process of this embodiment uses a controller to cooperate with a frequency converter to control the delivery pump (the first delivery pump 5 or the second delivery pump 6) to accurately deliver concentrated phosphoric acid or dilute phosphoric acid to the mixed juice clarification unit 8, cooperates with a metering unit 7 to detect the flow rate of delivering concentrated phosphoric acid or dilute phosphoric acid, and real-time adjusts the amount of concentrated phosphoric acid or dilute phosphoric acid delivered to the mixed juice clarification unit 8. It has high accuracy, and reduces the error caused by dilution by direct addition without adding water. It has high addition accuracy (better than 0.2%) and saves energy. 1. It can add undiluted concentrated phosphoric acid or diluted phosphoric acid. 2. It can add quantitatively after setting the addition ratio (ppm) according to the squeeze volume, or it can add according to the mixed juice flow rate after setting the addition ratio (ppm). The first addition method will not change the added flow rate as long as you do not change the set squeeze volume. The second method will add according to the change of mixed juice flow rate. That is, directly inputting the addition ratio ppm is convenient for process personnel to adjust the process, ensure the stability of the process, improve the quality of the product, and do not require special personnel to operate.

[0043] In some embodiments, the phosphoric acid storage unit 1 is further provided with a first temperature sensor, which is electrically connected to the control unit 4. By providing the first temperature sensor on the phosphoric acid storage unit 1 to detect the temperature, the phosphoric acid is prevented from solidifying due to low temperature, and the phosphoric acid storage unit 1 is conveniently and timely insulated by the heating unit to ensure the normal operation of the entire system.

[0044] In some embodiments, a phosphoric acid automatic addition system for a sub-method sugar production process further includes a first heating unit 2, which is connected to a control unit 4 and is used to heat concentrated phosphoric acid or diluted phosphoric acid in a phosphoric acid storage unit 1. By setting the first heating unit 2 in the phosphoric acid storage unit 1 and cooperating with a first temperature sensor to detect the temperature of the phosphoric acid storage unit 1, a controller controls whether the first heating unit 2 is heated according to the temperature detected by the first temperature sensor, so that the phosphoric acid storage unit 1 maintains a normal temperature, and prevents phosphoric acid from solidifying due to low temperature, resulting in the inability to transport phosphoric acid to the mixed juice clarification unit 8. The first heating unit 2 can be an existing heating product, such as an existing electric heating tube.

[0045] In some embodiments, the first heating unit 2 includes a heating container, a heating pipe, a power module, an air pump, a hot air pipe and a second temperature sensor. The heating container is a closed structure. The heating pipe is inserted into the heating container. The air pump is connected to the heating container through a pipeline. The power module is electrically connected to the heating pipe. The power module is electrically connected to the control unit 4. One end of the hot air pipe is connected to the heating container, and the other end of the hot air pipe is connected to the phosphoric acid storage unit 1. The second temperature sensor is arranged in the heating container to detect the air temperature in the heating container. The air in the heating container is supplied by the air pump. The high-temperature gas in the heating container is increased by the air pump to drive the high-temperature gas from the other end of the hot air pipe to be transported to the phosphoric acid storage unit 1. By setting such a first heating unit 2, the air with a higher temperature is transported to the phosphoric acid storage unit 1 by heating the air, so as to avoid the first heating unit 2 from contacting with the phosphoric acid storage unit 1, and to avoid the concentrated phosphoric acid or dilute phosphoric acid in the phosphoric acid storage unit 1 from reacting with the material of the first heating unit 2.

[0046] In some embodiments, an automatic phosphoric acid addition system for a sub-method sugar production process further includes a second heating unit, the second heating unit includes a heating belt and a thermal insulation layer, the heating belt is wrapped around the outside of the delivery pipe of the delivery unit, and the thermal insulation layer is wrapped around the outside of the delivery pipe wrapped with the heating belt. By arranging the second heating unit in the delivery pipe, it is further ensured that the phosphoric acid storage unit 1 and the delivery unit can operate normally. The heating belt and the thermal insulation layer are both existing products and will not be described in detail here.

[0047] It should be noted that the mixed juice clarification unit 8 is used for the mixed juice clarification process, which is used to receive the sugarcane juice (mixed juice) squeezed by the sugar factory and transport the clarified sugarcane juice. Mixed juice clarification is an important link in the sugar industry, which aims to remove impurities, colloids and other unnecessary components in the mixed juice through various technical means to improve product quality and production efficiency.

[0048] It should be noted that, by setting a mixed juice signal input in the mixed juice clarification unit 8, when the mixed juice flow rate is greater than the set value, the control unit 4 controls the first delivery pump 5 or the second delivery pump 6 to work, and automatically adds phosphoric acid to the mixed juice clarification unit 8. When the mixed juice flow rate is less than a certain value or the production is temporarily stopped, the frequency converter runs at a low speed, and the delivery pump runs at a low speed to protect the delivery pump, otherwise the system will be damaged due to the coagulation of phosphoric acid. Through the automatic phosphoric acid addition system designed in this way, phosphoric acid can be automatically added according to the changes in the mixed juice clarification unit 8 without manual operation.

[0049] The automatic phosphoric acid addition system also has the following advantages:

[0050] 1. The control unit 4 also includes a control box, which is used to install a PLC controller. The control circuits and components in the control box are designed according to the equipment required on site, and the signal line connection is simple.

[0051] 2. The control box panel is equipped with "start" and "stop" buttons, and a "status indicator light" display, so the display is intuitive, and the operation is simple, convenient and easy to learn.

[0052] 3. The panel on the control box is a full Chinese touch screen display. The flow control value can be changed as needed, and it can be completed on the Chinese touch screen of the system.

[0053] 4. The control box can view the total cumulative volume, instantaneous flow, curve, time, flow input signal value, etc.;

[0054] 5. Power-off retention function: If power is off during operation, the control unit 4 automatically retains the working data and status before the power is off. PLC controllers all have the function of power-off protection data, which can be set during programming.

[0055] 6. The system can input mixed juice signal to run automatically. When there is mixed juice flow, the system will automatically add it. When the flow is less than the set value, the system will circulate at a low speed.

[0056] The foregoing descriptions of specific exemplary embodiments of the present invention are for the purpose of explanation and illustration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can make modifications, substitutions, variations and various selections and changes to the embodiments without creative contribution as needed after reading this specification without departing from the principles and purpose of the present invention, but they are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An automatic phosphoric acid adding system for the sub-method sugar production process, characterized in that: include: A phosphoric acid storage unit, used for storing concentrated phosphoric acid or dilute phosphoric acid; A conveying unit, the conveying unit is connected to the phosphoric acid storage unit, and the conveying unit is used to convey the concentrated phosphoric acid or the diluted phosphoric acid in the phosphoric acid storage unit to the mixed juice clarification unit; A metering unit, which is arranged on a delivery pipeline of the delivery unit and is used to detect a speed at which the delivery unit delivers concentrated phosphoric acid or diluted phosphoric acid; and a control unit, which is electrically connected to the conveying unit and the metering unit respectively, and is used to receive the speed data of concentrated phosphoric acid or diluted phosphoric acid detected by the metering unit, and to control the conveying flow rate of the conveying unit.

2. The automatic phosphoric acid adding system for the sub-method sugar production process according to claim 1, characterized in that: The delivery unit includes a first delivery pump, a second delivery pump and a delivery pipeline. The first delivery pump and the second delivery pump are both electrically connected to the control unit. The inlet of the first delivery pump is connected to the phosphoric acid storage unit through the delivery pipeline, and the outlet of the first delivery pump is connected to the mixed juice clarification unit through the delivery pipeline; the inlet of the second delivery pump is connected to the phosphoric acid storage unit through the delivery pipeline, and the outlet of the second delivery pump is connected to the mixed juice clarification unit through the delivery pipeline. The second delivery pump is arranged in parallel with the first delivery pump.

3. The automatic phosphoric acid adding system of the sub-method sugar production process according to claim 2, characterized in that: The first delivery pump and the second delivery pump are both magnetic pumps, and the outlets and inlets of the first delivery pump and the second delivery pump are both provided with self-locking joints.

4. The automatic phosphoric acid adding system for the sub-method sugar production process according to claim 1, characterized in that: The metering unit is an electromagnetic flowmeter.

5. The automatic phosphoric acid adding system for the sub-method sugar production process according to claim 1, characterized in that: The phosphoric acid storage unit is a cubic container or a cylindrical container. A liquid level meter is provided on the phosphoric acid storage unit. The liquid level meter is electrically connected to the control unit.

6. The automatic phosphoric acid adding system for the sub-method sugar production process according to claim 1, characterized in that: The phosphoric acid storage unit is also provided with a first temperature sensor, which is electrically connected to the control unit.

7. The automatic phosphoric acid adding system for the sub-method sugar production process according to claim 1, characterized in that: The control unit includes a PLC controller, a touch screen and a frequency converter. The PLC controller is electrically connected to the metering unit, the touch screen is electrically connected to the PLC controller, the frequency converter is electrically connected to the PLC controller, the frequency converter is connected to a 220V power supply, and the frequency converter is electrically connected to the conveying unit.

8. The automatic phosphoric acid adding system for the sub-method sugar production process according to claim 1, characterized in that: The device also includes a first heating unit, which is connected to the control unit and is used to heat the concentrated phosphoric acid or the diluted phosphoric acid in the phosphoric acid storage unit.

9. The automatic phosphoric acid adding system for the sub-method sugar production process according to claim 8, characterized in that: The first heating unit includes a heating container, a heating tube, a power module, an air pump, a hot air pipe and a second temperature sensor. The heating container is a closed structure. The heating tube is inserted into the heating container. The air pump is connected to the heating container through a pipeline. The power module is electrically connected to the heating tube. The power module is electrically connected to the control unit. One end of the hot air pipe is connected to the heating container, and the other end of the hot air pipe is connected to the phosphoric acid storage unit. The second temperature sensor is arranged in the heating container to detect the air temperature in the heating container.

10. The automatic phosphoric acid adding system for the sub-method sugar production process according to claim 1, characterized in that: It also includes a second heating unit, which includes a heating belt and a thermal insulation layer. The heating belt is wrapped around the outside of the conveying pipeline of the conveying unit, and the thermal insulation layer is wrapped around the outside of the conveying pipeline wrapped with the heating belt.

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