Sugarcane juice preliming device capable of adjusting pH value on line

Abstract

The utility model provides a cane juice preliming device capable of adjusting the pH value on line, which comprises a cane juice storage tank, a cane juice tank, a flow meter, a liquid level sensor, a delivery pump, a cane juice delivery pipe, a lime milk pipe, a lime milk high-position storage tank, a linear involute valve, a detection sampling pipe, a pH glass electrode automatic detector, a sampling disc, an intelligent controller and an upper computer. The automatic pH glass electrode detector is additionally arranged on the cane juice preliming device, so that automatic pH detection can be carried out on cane juice in real time; the linear gradual opening valve is additionally arranged, so that the lime milk adding amount can be automatically and accurately adjusted; the whole device is controlled by an intelligent controller, the addition amount of lime milk can be adjusted online in time according to received numerical values, it is ensured that the pH of cane juice preliming is within a reasonable range, and the situation that the pH of preliming is fluctuated due to the fact that a cane juice pump is vacuumized due to fluctuation of the squeezing amount and the too low liquid level in a squeezing juice mixing box is effectively avoided; in addition, the device is simple in structure, easy to manufacture and install, and simple and convenient to use and maintain.

Description

Technical Field

[0001] The utility model relates to a sugar making device in a sugar factory, in particular to a cane juice pre-ashing device for adjusting pH value online. 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. The sulfuric acid-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. The pH value also has a great influence on the conversion of sugar juice and the decomposition of reducing sugar. If there is a large amount of sucrose conversion and the decomposition of reducing sugar during the production process, it will cause the loss of white sugar and the increase of scale accumulation in the pipelines and tanks of each section. Therefore, pH control directly affects the recovery rate of white sugar and product quality, and also determines the formation of scale accumulation in pipelines and tanks. At the same time, it affects the input and operation cost control of production auxiliary materials (water, lime and sulfur, etc.), and affects the discharge of wastewater, waste gas and filter mud generated in the production process. It can be seen that the sulfuric acid-sulfite method of sugar production is a continuous production process, so the earlier the pH value is controlled, the better it is for production.

[0003] The structure of the traditional cane juice pre-ashing device is as follows: Figure 3 As shown, it includes a cane juice storage tank, the cane juice storage tank is connected to a cane juice inlet pipe, the cane juice inlet pipe is provided with a flowmeter for measuring the flow of cane juice, a liquid level sensor is provided on one side of the cane juice storage tank, the other side of the cane juice storage tank is connected to a delivery pump through a pipeline, and the delivery pump is connected to the cane juice delivery pipe. Workers regularly sample the cane juice in the cane juice delivery pipe, use pH test paper or titration to detect the pH of the cane juice, and manually adjust the amount of lime milk added according to the pH value. This operation method has the following defects: first, the stability of the cane juice inlet will be caused by the fluctuation of the squeezed amount and the low liquid level in the squeezed juice mixing box, which will cause the cane juice pump to be emptied, thereby causing the pH of the cane juice in the cane juice storage tank to fluctuate. After the pH test paper or titration detection is completed, the pH of the cane juice in the cane juice inlet pipe is inconsistent with the measured value due to the time difference, thereby affecting the pH adjustment control; second, the use of manual detection, on the one hand, there is an error in the detection value, and on the other hand, it cannot be detected in real time and adjusted online in time, thereby affecting the pH value of the pre-liming of the cane juice, thereby affecting the subsequent processes. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a sugarcane juice pre-liming device for online adjusting the pH value. The sugarcane juice pre-liming device is additionally provided with a pH glass electrode automatic detector, which can automatically detect the pH of the sugarcane juice in real time; an additional linear gradually opening valve is additionally provided, which can automatically and accurately adjust the amount of added lime milk; the entire device is controlled by an intelligent controller, and the amount of lime milk added can be timely adjusted online according to the received numerical value, so as to ensure that the pH of the sugarcane juice pre-liming is within a reasonable range, and effectively avoid the pH fluctuation of the pre-liming caused by the evacuation of the sugarcane juice pump due to the fluctuation of the squeeze volume and the too low liquid level in the squeeze mixing box; 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 device for pre-liming cane juice for adjusting pH value online is the same as the prior art in that it comprises a cane juice storage tank, the cane juice storage tank is connected to a cane juice inlet pipe, the cane juice inlet pipe is provided with a flowmeter for measuring the flow of cane juice, a liquid level sensor is provided on one side of the cane juice storage tank, the other side of the cane juice storage tank is connected to a delivery pump through a pipeline, the delivery pump is connected to the cane juice delivery pipe, but the difference is that the inlet of the cane juice storage tank is connected to the outlet of a lime milk high-level storage tank through a lime milk pipe, the lime milk pipe is provided with a linear involute valve, the cane juice delivery pipe is provided with a detection sampling tube, the detection sampling tube is connected to a pH glass electrode automatic detector, the sampling bucket of the pH glass electrode automatic detector is communicated with a sampling disk, the sampling disk is fixed on a support frame, the flowmeter, the linear involute valve, the liquid level sensor, and the pH glass electrode automatic detector are all connected to an intelligent controller, and the intelligent controller is connected to 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 recovery overflow pipe communicating with the sugarcane juice storage tank 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 sugarcane juice pre-liming device is equipped with an automatic pH glass electrode detector, which can automatically detect the pH of the sugarcane juice in real time; a linear gradual opening valve is added, which can automatically and accurately adjust the amount of lime milk added; the entire device is controlled by an intelligent controller, and the amount of lime milk added can be adjusted online in time according to the received value to ensure that the pH of the sugarcane juice pre-liming is within a reasonable range, effectively avoiding the pH fluctuation of the pre-liming caused by the sugarcane juice pump being emptied due to the fluctuation of the squeeze volume and the low liquid level in the squeeze mixing box; 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.

[0010] 2. A recovery overflow pipe connected to the sugarcane juice storage tank 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 schematic diagram of the structure of the utility model;

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

[0014] Figure 3 It is a structural schematic diagram of an existing cane juice pre-ashing device;

[0015] Figure numbers: 1. Sugarcane juice storage tank, 2. Sugarcane juice pipe, 3. Flow meter, 4. Liquid level sensor, 5. Delivery pump, 6. Sugarcane juice delivery pipe, 7. Lime milk pipe, 8. Lime milk high-level box, 9. Linear involute valve, 10. Detection sampling tube, 11. pH glass electrode automatic detector, 12. Sampling tray, 13. Support frame, 14. Intelligent controller, 15. Host computer. DETAILED DESCRIPTION

[0016] like Figure 1The utility model is shown in a specific embodiment of the present invention, a cane juice pre-ashing device for adjusting pH value online, which is the same as the prior art in that it includes a cane juice storage tank 1, the cane juice storage tank 1 is connected to a cane juice inlet pipe 2, the cane juice inlet pipe 2 is provided with a flowmeter 3 for measuring the flow rate of cane juice, and the squeezed cane juice is transported to the cane juice storage tank 1 through the cane juice inlet pipe 2 under the action of a juice pump, a liquid level sensor 4 is provided on one side of the cane juice storage tank 1, and the liquid level sensor 4 is used to monitor the amount of cane juice in the cane juice storage tank 1 in real time, and the other side of the cane juice storage tank 1 is connected to a delivery pump 5 through a pipeline, and the delivery pump 5 is connected to a cane juice delivery pipe 6, The end of the sugarcane juice conveying pipe 6 is connected to the first heating section, and the difference is that: the inlet of the sugarcane juice storage tank 1 is connected to the outlet of the lime milk high-level storage tank 8 through the lime milk pipe 7, and the lime milk high-level storage tank 8 is located above the sugarcane juice storage tank 1, and the inlet of the lime milk high-level storage tank 8 is connected to the lime milk preparation workshop. In order to improve the utilization rate of resources, the present embodiment is also provided with a lime milk overflow pipe connected to the lime milk preparation workshop on the lime milk high-level storage tank 8, and the lime milk pipe 7 is provided with a linear involute valve 9, and the linear involute valve 9 can accurately control the amount of lime milk added. For details of the specific structure of the linear involute valve 9, please refer to the utility model with the authorization announcement number CN 206468842U. The sugarcane juice conveying pipe 6 is provided with a detection sampling pipe 10, and the detection sampling pipe 10 is connected to the pH glass electrode automatic detector 11. For details of the specific structure of the pH glass electrode automatic detector 11, please refer to the authorization announcement number CN 201307099Y utility model, in order to ensure the stability of the pH glass electrode automatic detector 11 and prevent the detection of sugarcane juice from dripping, the sampling bucket of the pH glass electrode automatic detector 11 is connected to the sampling plate 12, the sampling plate is fixed on the support frame 13, the flow meter 3, the linear involute valve 9, the liquid level sensor 4, the pH glass electrode automatic detector 11 are all connected to the intelligent controller 14, the intelligent controller 14 is connected to the host computer 15 that can display all the values, and the intelligent controller 14 is connected to the pH glass electrode automatic detector according to the pH glass electrode automatic detector. The value of 11 adjusts the opening degree of the linear progressive valve 9, thereby accurately controlling the amount of lime milk added. The host computer 15 can display the values ​​detected by the flow meter 3, the liquid level sensor 4, and the pH glass electrode automatic detector 11. In this embodiment, RS485 / RS232 communication is used between the intelligent controller 13 and the host computer 15. The host computer 15 can be a DCS distributed control platform or a remote control terminal of a pre-ash pH value control system. In this embodiment, manual regulating valves are provided on all pipelines to facilitate adjustment of the liquid flow rate of each pipeline.

[0017] The bottom end of the sampling plate 12 is provided with a recovery overflow pipe communicated with the sugarcane juice storage tank 1, so as to improve the utilization rate of resources, avoid the waste of resources, and ensure the cleanliness and sanitation of the equipment environment.

[0018] When the utility model is used, the device is started, and the squeezed sugarcane juice is transported to the sugarcane juice storage tank 1 through the sugarcane juice pipe 2 under the action of the juice pump, and the sampled juice flows into the sampling bucket of the pH glass electrode automatic detector 11 through the detection sampling pipe 10 for pH value detection, and the pH value signal is transmitted to the intelligent controller 14, and the intelligent controller 14 compares the difference between the detected pH value of the sugar juice and the set pH value. When the detected pH value of the sugar juice exceeds the set pH value range (the pH value of the pre-ashing of the sugarcane sugar factory is generally controlled between 6.4 and 7.2, if the set value is set to 6.8, then the range of 6.8±0.2 meets the production requirements), the intelligent controller 14 gives the opening value signal of the linear involute valve 9 through internal adaptive calculation and adjusts the linear The opening of the linear involute valve 9 changes, and the inflow of lime milk into the sugarcane juice storage tank 1 changes, and the pH value of the sugarcane juice in the sugarcane juice storage tank 1 changes accordingly. The sugarcane juice in the squeezed sugarcane juice storage tank 1 is continuously pumped away, and the sampled juice is continuously tested by the pH glass electrode automatic detector 11 for pH detection and feedback signals are given to the intelligent controller 14. The intelligent controller 14 intermittently (the linear involute valve 9 will act once every 10 to 30 seconds for the squeezed pre-ash pH control cycle) adjusts the opening value of the linear involute valve 9 according to the detected changes in the pH value of the sugarcane juice, until it is detected that the difference between the pH value of the sugarcane juice and the set value meets the production requirements, the linear involute valve 9 maintains the current opening and does not act, and the pH value of the sugarcane juice in the sugarcane juice storage tank 1 is also stable within the pH value range required for production. The process flow is as follows: Figure 2 shown.

[0019] Since there are many uncertain factors in squeezing sugarcane juice, sometimes the flow rate of sugar juice in the sugarcane juice inlet pipe 2 will change greatly, causing the liquid level value of sugar juice in the sugarcane juice storage tank 1 to change greatly, and even the delivery pump 5 to be emptied. When the sugar juice flow rate changes too much or the delivery pump 5 is emptied, the pH of the sugar juice in the sugarcane juice storage tank 1 will fluctuate greatly. The sugarcane juice inlet pipe 2 continuously detects the flow rate value of the incoming juice in real time and feeds it back to the pH value intelligent controller 14. The liquid level sensor 4 continuously detects the liquid level value in the sugarcane juice storage tank 01 in real time and feeds it back to the intelligent controller 14. When the juice flow meter 3 detects that the flow rate has changed greatly in a short period of time, the intelligent controller 14 gives a compensation coefficient through internal adaptive calculation to set the opening value of the linear involute valve 9, thereby reducing the influence of the flow change on the pH value control. When the liquid level sensor 4 detects that the liquid level in the sugarcane juice storage tank 1 is too low and the evacuation phenomenon occurs, the intelligent controller gives a compensation coefficient through internal adaptive calculation to set the opening value of the linear involute valve 9, thereby reducing the influence of the evacuation phenomenon on the pH value control.

[0020] 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 cane juice pre-ashing device for adjusting pH value online, comprising a cane juice storage tank (1), the cane juice storage tank (1) being connected to a cane juice supply pipe (2), the cane juice supply pipe (2) being provided with a flow meter (3) for measuring the flow rate of cane juice, a liquid level sensor (4) being provided on one side of the cane juice storage tank (1), the other side of the cane juice storage tank (1) being connected to a delivery pump (5) through a pipeline, the delivery pump (5) being connected to a cane juice delivery pipe (6), characterized in that: The inlet of the sugarcane juice storage tank (1) is connected to the outlet of the lime milk high-level storage tank (8) through a lime milk pipe (7); the lime milk pipe (7) is provided with a linear involute valve (9); the sugarcane juice delivery pipe (6) is provided with a detection sampling pipe (10); the detection sampling pipe (10) is connected to a pH glass electrode automatic detector (11); the sampling bucket of the pH glass electrode automatic detector (11) is in communication with a sampling plate (12); the sampling plate (12) is fixed on a support frame (13); the flow meter (3), the liquid level sensor (4), the linear involute valve (9), and the pH glass electrode automatic detector (11) are all connected to an intelligent controller (14); and the intelligent controller (14) is connected to a host computer (15) capable of displaying all numerical values.

2. The sugarcane juice pre-ashing device for adjusting pH value online according to claim 1, characterized in that: The bottom end of the sampling plate (12) is provided with a recovery overflow pipe which is in communication with the sugarcane juice storage tank (1).

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