Sugar juice stoving neutralization device based on pH automatic control

Abstract

The utility model provides a sugar juice stoving neutralization device based on pH automatic control. Comprising a sugar juice buffer storage box, a conveying pump, a sugar juice conveying header pipe, a pressure sensor, a temperature sensor, two sugar juice branch pipes, a sugar juice valve, a neutralization reaction tank, a sulfur dioxide branch pipe, a sulfur dioxide header pipe, a lime milk inflow pipe, a linear involute valve, a reversing handle, a lime milk high-level box, a steam dispersing tank, a sampling pipe, a pH glass electrode automatic detector, an intelligent controller and an upper computer. The sugar juice stoving neutralization device is provided with two sets of sulfuric acid neutralization systems, so that one set is used and the other set is cleaned and maintained; a pressure sensor and a temperature sensor are arranged to detect the pressure and the temperature in real time, a pH glass electrode automatic detector is arranged to detect the pH value in real time, an intelligent controller conducts temperature compensation to calculate the actual sugar juice pH value, the opening degree of a linear involute valve is accurately adjusted, and it is ensured that the pH of neutralized sugar juice is within a reasonable range; the influence of external factors on the stoving neutralization of the sugar juice is effectively eliminated.

Description

Technical Field

[0001] The utility model relates to a sugar making device in a sugar factory, in particular to a sugar juice sulfur fumigation neutralization device based on pH automatic control. Background Art

[0002] Sugarcane is rich in sugar and water, and also contains various vitamins, fats, proteins, organic acids, calcium, iron and other substances that are very beneficial to human metabolism. It is one of the main raw materials for sugar production. Sulfite method is currently a common method used by sugar factories. The process flow of this method includes: mixed juice → screening → pre-ashing (pH6.4-7.2) → first heating (60-70℃) → pipeline sulfur fumigation neutralizer (pH6.8-7.3) → second heating (100-103℃) → settler → clarified juice → clear juice → clear juice heating → evaporation. In the whole process, the pH value control of sulfur fumigation neutralization reaction is an important indicator affecting product quality. Controlling the pH value within the required range is the key to achieving clarification. If the pH value is low, the rate of sucrose conversion and reduction to sugar will be accelerated, resulting in a lower sugar recovery rate. At the same time, the newly formed precipitate will be dissolved in the sugarcane juice, and the non-sugar content will increase, causing the purity difference to become negative. On the contrary, when the pH value is high, the reducing sugar will be decomposed into new pigments, the color will become darker, and it will become sour again. The sucrose will be further converted, making it difficult to boil sugar, and the amount of molasses will increase, which will also lead to a lower sugar recovery rate. The color value, ash content, impurities, and turbidity of the finished sugar will increase, and the content of harmful substances such as residual sulfur dioxide will increase, resulting in a decrease in product quality. If there is a large amount of sucrose conversion and reducing sugar decomposition in the production process, it will cause the loss of white sugar and increase the fouling of the pipelines and tanks in each section. Therefore, pH value control directly affects the recovery rate of white sugar and product quality, and also determines the formation of scale in pipes and tanks. It also affects the input and operating cost control of production auxiliary materials (water, lime and sulfur, etc.), and will affect the emission of wastewater, waste gas, filter mud and other wastes generated in the production process.

[0003] With the continuous improvement of people's living standards, consumers have higher and higher requirements for food quality and food safety. People have also put forward higher standards for the quality of white sugar. The control accuracy requirements for the pH value of the mixed juice neutralization reaction have also increased accordingly. In recent years, the crushing capacity of a single production line in a sugar factory has continued to expand, and the capacity of the neutralization reaction tank has also increased accordingly. Many automated equipment have also been added to the neutralization reaction tank, such as the liquid level control of the mixed juice box in front of the neutralization reaction tank and the use of a multi-nozzle automatic sulfur fumigation neutralizer for the neutralization reaction tank. The additional equipment will inevitably cause obvious fluctuations in the pH value of the sulfur fumigation neutralization reaction of the sugar juice, and these factors causing the fluctuations are irregular. In addition, the mixed juice passes through the juice very quickly during the neutralization reaction (the control time period is very short). Therefore, a large amount of sugar juice has already flowed through the entire process of pH value stabilization after a large fluctuation. The pH value of this part of the sugar juice is not within a reasonable range, which will affect the subsequent processes and even the quality of the product. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a sugar juice sulfur fumigation neutralization device based on pH automatic control. The sugar juice sulfur fumigation neutralization device is equipped with two sets of sulfuric acid neutralization systems, which can meet the requirements of one set for use and the other for cleaning and maintenance. A pressure sensor and a temperature sensor are arranged on the sugar juice delivery main pipe to detect the pressure and temperature of the sugar juice therein in real time, and a pH glass electrode automatic detector is arranged to detect the pH value of the neutralized sugar juice in real time, so that the intelligent controller can make temperature compensation and calculate the actual pH value of the sugar juice according to the received signal, and then accurately adjust the opening of the linear progressive valve to ensure that the pH of the neutralized sugar juice is within a reasonable range, and effectively eliminate the influence of external factors on the sulfur fumigation neutralization of the sugar juice. In addition, the structure of the device is simple, which is not only easy to manufacture and install, but also simple to use and maintain.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The sugar juice sulfur fumigation neutralization device based on pH automatic control comprises a sugar juice buffer storage tank, the outlet of the sugar juice buffer storage tank is connected to a delivery pump through a pipeline, the delivery pump is connected to a sugar juice delivery main pipe, a pressure sensor and a temperature sensor are arranged on the sugar juice delivery main pipe, two sugar juice branch pipes are arranged on the sugar juice branch pipes, juice valves are arranged on the sugar juice branch pipes, the ends of the sugar juice branch pipes are connected to a neutralization reaction tank, the neutralization reaction tank is a multi-nozzle type automatic sulfur fumigation neutralizer, the inlet of the neutralization reaction tank is connected to a sulfur dioxide branch pipe, a manual regulating valve is arranged on the sulfur dioxide branch pipe, and the end of the manual regulating valve is connected to the sulfur dioxide main pipe, and the neutralization reaction tank is also provided with a lime milk inlet. pipe, two lime milk inflow pipes are connected with a linear involute valve, a reversing handle is provided on the linear involute valve, the linear involute valve is connected with a lime milk high-level box through a pipeline, the neutralization reaction tanks are connected with the steam dispersion tank through the neutralization outlet pipe, each neutralization outlet pipe is connected with a sampling pipe with a manual regulating valve, the two sampling pipes are connected with the sampling bucket of the pH glass electrode automatic detector, the sampling bucket of the pH glass electrode automatic detector is connected with a sampling disk at the bottom thereof, the sampling disk is fixed on a supporting frame, the pressure sensor, the temperature sensor, the linear involute valve, and the pH glass electrode automatic detector are all connected with an intelligent controller, and the intelligent controller is connected with a host computer that can display all numerical values.

[0007] As a preferred technical solution, in order to improve resource utilization, avoid waste of resources, and ensure a clean and hygienic equipment environment, a sugar juice recovery overflow pipe is provided at the bottom of the sampling tray.

[0008] Compared with the prior art, the utility model has the following beneficial effects:

[0009] 1. The sugar juice sulfur fumigation neutralization device is equipped with two sets of sulfuric acid neutralization systems, which can meet the requirements of one set for use and one set for cleaning and maintenance; a pressure sensor and a temperature sensor are set on the sugar juice delivery main pipe to detect the pressure and temperature of the sugar juice therein in real time, and a pH glass electrode automatic detector is set to detect the pH value of the neutralized sugar juice in real time, so that the intelligent controller can make temperature compensation according to the received signal to calculate the actual pH value of the sugar juice, and then accurately adjust the opening of the linear gradual opening valve to ensure that the pH of the neutralized sugar juice is within a reasonable range, effectively eliminating the influence of external factors on the sulfur fumigation neutralization of sugar juice; in addition, the structure of the device is simple, which is not only easy to manufacture and install, but also easy to use and maintain.

[0010] 2. A sugar juice recovery overflow pipe is provided at the bottom of the sampling plate to improve resource utilization, avoid waste of resources, and ensure a clean and hygienic equipment environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a schematic diagram of the process of the device;

[0014] Figure numbers: 1. Sugar juice buffer storage tank, 2. Delivery pump, 3. Sugar juice delivery main pipe, 4. Pressure sensor, 5. Temperature sensor, 6. Sugar juice branch pipe, 7. Sugar juice valve, 8. Neutralization reaction tank, 9. Sulfur dioxide branch pipe, 10. Sulfur dioxide main pipe, 11. Lime milk inlet pipe, 12. Linear involute valve, 13. Neutralization outlet pipe, 14. Lime milk high-level box, 15. Bulk steam tank, 16. Sampling tube, 17. pH glass electrode automatic detector, 18. Sampling tray, 19. Support frame, 20. Intelligent controller, 21. Host computer, 22. Reversing handle. DETAILED DESCRIPTION

[0015] like Figure 1The utility model is shown in a specific embodiment of the utility model, which is a sugar juice sulfur fumigation neutralization device based on pH automatic control, including a sugar juice buffer storage tank 1. In order to monitor the sugar juice in the sugar juice buffer storage tank 1 in real time, this embodiment is provided with a liquid level sensor on the buffer storage tank 1, and the liquid level sensor is connected to the intelligent control system, and the liquid level of the sugar juice buffer tank 1 can be adjusted in time according to the signal fed back by the liquid level sensor. The outlet of the sugar juice buffer storage tank 1 is connected to the delivery pump 2 through a pipeline, and the delivery pump 2 is connected to the sugar juice delivery main pipe 3. The sugar juice delivery main pipe 3 is provided with a pressure sensor 4 and a temperature sensor 5. The sugar juice delivery main pipe 3 is provided with two sugar juice branch pipes 6, and the sugar juice branch pipes 6 are provided with a pressure sensor 4 and a temperature sensor 5. A juice valve 7 is provided, and the ends of the juice branch pipe 6 are connected to the neutralization reaction tank 8. The neutralization reaction tank 8 is a multi-nozzle automatic sulfur fumigation neutralizer. The inlet of the neutralization reaction tank 8 is connected to the sulfur dioxide branch pipe 9. The sulfur dioxide branch pipe 9 is provided with a manual regulating valve, and its end is connected to the sulfur dioxide main pipe 10. The sulfur dioxide main pipe 10 is connected to the sulfur furnace main pipe. The neutralization reaction tank 8 is also provided with a lime milk inlet pipe 11. The two lime milk inlet pipes 11 are connected to the linear involute valve 12. The linear involute valve 12 can accurately control the flow of the lime milk inlet pipe 11. The specific structure of the linear involute valve 12 is detailed in the authorization announcement number CN 206468842U utility model, the linear involute valve 12 is provided with a reversing handle 22, the linear involute valve 22 is provided with an opening communicating with two lime milk inflow pipes 11, the linear involute valve 12 can be connected with the two lime milk inflow pipes 11 respectively through the reversing handle 22, the linear involute valve 12 is connected with the lime milk high position box 14 through a pipeline, the lime milk high position box 14 is located above the neutralization reaction tank 8, the inlet of the lime milk high position box 14 is connected with the lime milk preparation workshop, in order to improve the utilization rate of resources, in this embodiment, the lime milk high position box 1 4 is also provided with a lime milk overflow pipe connected to the lime milk preparation workshop, the neutralization reaction tank 8 is connected to the steam tank 15 through the neutralization outlet pipe 13, and the sugar juice after sulfur fumigation and neutralization flows into the steam tank 15 from the neutralization outlet pipe, and then flows into the next section from the outlet of the steam tank 15, each neutralization outlet pipe 13 is connected to a sampling pipe 16 with a manual regulating valve, and the two sampling pipes 16 are connected to the sampling bucket of the pH glass electrode automatic detector 17. In this embodiment, the pH glass electrode automatic detector 17 is set as a double glass electrode. Its specific structure is detailed in the invention with the authorization announcement number CN 102103120B. The sampling bucket of the pH glass electrode automatic detector 17 is connected to the sampling disk 18 located at its bottom, and the sampling disk 18 is fixed on the support frame 19. The pressure sensor 4, the temperature sensor 5, the linear involute valve 12, and the pH glass electrode automatic detector 17 are all connected to the intelligent controller 20, and the intelligent controller 20 is connected to the host computer 21 that can display all values.The intelligent controller 20 can adjust the opening degree of the linear involute valve 12 according to the signals fed back by the pressure sensor 4 and the pH glass electrode automatic detector 17. The intelligent controller 20 can also calculate the actual pH value of the sugar juice as temperature compensation when the pH glass electrode automatic detector 17 detects the pH value according to the signals fed back by the temperature sensor. In this embodiment, RS485 / RS232 communication is used between the intelligent controller 20 and the host computer 21. The host computer 21 can be a DCS distributed control platform. In this embodiment, manual regulating valves are provided on all pipelines to facilitate the adjustment of the liquid flow of each pipeline.

[0016] A sugar juice recovery overflow pipe is provided at the bottom of the sampling plate 18 to improve resource utilization, avoid waste of resources, and ensure a clean and hygienic equipment environment.

[0017] When the utility model is used: the reversing handle 22 is turned to the linear progressively opening valve 12 to communicate with the lime milk inlet pipe 11 of the running neutralization system, and the valves on the other set of neutralization systems are all in a closed state; the sugar juice in the sugar juice mixing buffer storage tank 1 enters the neutralization reaction tank 8 through the sugar juice conveying juice main pipe 3 and the sugar juice branch pipe 6 under the action of the delivery pump 2, and at this time, sulfur dioxide enters the neutralization reaction tube through the sulfur dioxide main pipe 10 and the sulfur dioxide branch pipe 9 to carry out neutralization reaction, and the sugar juice after the neutralization reaction flows into the steam diffuser 15 through the neutralization outlet pipe 13, and flows to the next working section through the pipeline below the steam diffuser 15.

[0018] In the above process, the sampling tube 16 takes the sugar juice in the neutralization outlet tube 13 to the sampling bucket of the pH glass electrode automatic detector 17 in real time for pH value detection, the pressure sensor 4 and the temperature sensor 5 detect the pressure and temperature in the sugar juice conveying main pipe 3 in real time, and the intelligent controller 20 calculates the actual sugar juice pH value based on the received detection values ​​and temperature compensation, and adjusts the opening of the linear involute valve 12 through internal adaptive calculation (the neutralization reaction pH value control cycle is generally 7 seconds to 30 seconds, and the linear involute valve 12 will act once), effectively ensuring that the sugar juice after sulfur fumigation is within a reasonable range (the neutralization reaction pH value is generally controlled between 6.8 and 7.6. If the set value is set to 7.2, then the range of 7.2±0.2 meets the production requirements). The process flow is as follows: Figure 2 shown.

[0019] Of course, the above is only a detailed description of the preferred specific implementation method of the utility model in combination with the drawings, and it is not intended to limit the scope of implementation of the utility model. All equivalent changes made according to the principle, construction and structure of the utility model should be included in the protection scope of the utility model.

Claims

1. A sugar juice sulfur fumigation neutralization device based on pH automatic control, comprising a sugar juice buffer storage tank (1), wherein the outlet of the sugar juice buffer storage tank (1) is connected to a delivery pump (2) through a pipeline, wherein the delivery pump (2) is connected to a sugar juice delivery main pipe (3), wherein the sugar juice delivery main pipe (3) is provided with a pressure sensor (4) and a temperature sensor (5), wherein the sugar juice delivery main pipe (3) is provided with two sugar juice branch pipes (6), wherein each of the sugar juice branch pipes (6) is provided with a sugar juice valve ( 7), the ends of the sugar juice branch pipes (6) are connected to the neutralization reaction tank (8), the neutralization reaction tank (8) is a multi-nozzle type automatic sulfur fumigation neutralizer, the inlets of the neutralization reaction tank (8) are connected to the sulfur dioxide branch pipes (9), the sulfur dioxide branch pipes (9) are provided with manual regulating valves, and the ends thereof are connected to the sulfur dioxide main pipe (10), the neutralization reaction tank (8) is also provided with lime milk inlet pipes (11), the two lime milk inlet pipes (11) The linear involute valve (12) is connected to the linear involute valve (12), the linear involute valve (12) is provided with a reversing handle (22), the linear involute valve (12) is connected to the lime milk high-level box (14) through a pipeline, the neutralization reaction tank (8) is connected to the steam dissipation tank (15) through the neutralization outlet pipe (13), each neutralization outlet pipe (13) is connected to a sampling pipe (16) with a manual regulating valve, the two sampling pipes (16) are connected to the sampling bucket of the pH glass electrode automatic detector (17), the sampling bucket of the pH glass electrode automatic detector (17) is connected to the sampling disk (18) located at the bottom thereof, the sampling disk (18) is fixed on the support frame (19), the pressure sensor (4), the temperature sensor (5), the linear involute valve (12), and the pH glass electrode automatic detector (17) are all connected to the intelligent controller (20), and the intelligent controller (20) is connected to the host computer (21) that can display all numerical values.

2. The sugar juice sulfur fumigation neutralization device based on automatic pH control according to claim 1, characterized in that: A sugar juice recovery overflow pipe is provided at the bottom end of the sampling plate (18).

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