A method and device for regenerating a carbon column for syrup refining

Abstract

The present invention discloses a carbon column regeneration method and equipment for syrup refining, including backwashing, brine soaking, alkali cleaning, air tumbling, sulfuric acid neutralization, three steam regeneration, water washing and other steps to regenerate the carbon column, which can effectively improve the refining processing capacity of the saturated carbon column. Soluble protein, 5-hydroxymethylfurfural and other impurities in the carbon column are removed by processes such as brine soaking, alkali acid regeneration, and air tumbling; the carbon column is heated and expanded by three high-temperature steam, and the adsorbed odor compounds such as 2-aminoacetophenone can be effectively blown off and desorbed from the activated carbon. The present invention can effectively regenerate the carbon column using only steam, caustic soda and sulfuric acid solution, without the need to use high-investment, high-energy-consuming equipment such as incinerators, thereby reducing the regeneration cost. The present invention also discloses a carbon column refining and regeneration equipment for syrup refining, which ensures the high efficiency and stability of the refining.

Description

Technical Field

[0001] The invention relates to the technical field of light industry and chemical industry biotechnology, and in particular to equipment and a method for efficiently refining fructose-glucose syrup. Background Art

[0002] Starch syrup is mainly prepared through the processes of corn starch hydrolysis, liquefaction, saccharification, filtration, refining, and concentration. The main function of the refining process is to remove pigments, ions, ash, and odor compounds (2-Ap, HMF, etc.) in the sugar solution, improve the light transmittance of the sugar solution, and make the syrup have fewer impurities and purer. Therefore, the refining process seriously affects the quality of the product. Granular activated carbon is mainly made of coconut shells, fruit shells, and coal, etc., and is finely processed through a series of production processes. It has excellent deodorization and decolorization capabilities and is widely used in food, domestic water, deep wastewater purification, chemical industry and other industries. Granular activated carbon mainly uses its microporous structure to adsorb odor factors, pigments, etc. in the sugar solution, thereby purifying and removing impurities from the sugar solution. As the adsorption continues, its adsorption capacity will gradually decrease until it is saturated. At this time, the activated carbon needs to be regenerated to restore its adsorption capacity for the next adsorption. The conventional regeneration method is to use an incinerator for incineration regeneration, but this method requires huge investment and the equipment costs tens of millions; the incinerator consumes a lot of energy during use, and the waste gas generated during the incineration process is not conducive to environmental protection and does not conform to the concept of green and sustainable development.

[0003] Therefore, in response to the above problems, developing an efficient energy-saving regeneration process and equipment for granular carbon will further improve the regeneration efficiency and reduce costs. Summary of the invention

[0004] In view of the above situation, the technical problem to be solved by the present invention is how to provide a more efficient and low-cost carbon column regeneration method and equipment for syrup refining, so as to better improve the syrup quality, improve the carbon column regeneration efficiency, and reduce the carbon column regeneration cost.

[0005] To achieve the above object, the present invention provides a method for regenerating a carbon column for syrup refining, comprising the following steps:

[0006] (1) Column cutting: Detect the 2-Ap of the carbon column output. When 2-Ap ≥ 0.5 ppb is detected, stop feeding and discharging the carbon column and switch the carbon column to the cleaning state;

[0007] (2) Backwashing: Use deionized water to backwash the granular carbon. The backwash flow rate is controlled at 3BV to 5BV. The backwash time is more than 2 hours until the effluent water is not obviously turbid.

[0008] (3) Soaking in salt water: Press 3-6 bar compressed air into the top of the column to remove the remaining water in the column. Then, let saturated salt water enter the carbon column from the bottom to completely soak the granular carbon for more than 30 minutes.

[0009] (4) Alkali regeneration: A 2% to 5% dilute sodium hydroxide solution is heated to above 80°C using 95°C hot water and then enters the carbon column from the bottom of the column. The dilute alkali flow rate is controlled at 1BV to 2BV.

[0010] (5) Air tumbling: Use Roots blower to tumble 16m 3 / min~19m 3 / min air is pumped into the carbon column from the bottom to make the alkali and granular carbon tumble for more than 2 hours;

[0011] (6) Backwashing: Use deionized water to backwash the carbon column. The flow rate of deionized water is controlled at 3BV to 5BV. Wash until the pH of the effluent is less than 12.

[0012] (7) Water pressure: Pressurize 3-6 bar compressed air from the top of the column to press the water in the column out from the distributor in the middle of the carbon column. The water level stops when it reaches between the two tuning fork switches.

[0013] (8) Acid regeneration: A 2% to 5% dilute sulfuric acid solution is introduced into the carbon column from the bottom at a rate of 1BV to 2BV for 15min to 30min;

[0014] (9) Water pressure: Press 3-6 bar compressed air into the top of the column to clean the water in the column;

[0015] (10) Steam preheating: Steam enters from the bottom of the column and is discharged from the top of the column. When the temperature sensor inside the column reaches above 85°C, the steam is stopped;

[0016] (11) Steam inlet: Steam is introduced from the top of the column and discharged from the bottom of the column. The temperature sensor at the bottom of the column reaches above 110°C and the steam inlet is maintained for more than 1 hour;

[0017] (12) Steam inlet: Steam is introduced from the bottom of the column again, and steam is discharged from the top of the column. When the temperature sensor inside the column reaches above 110°C, the steam is stopped and the steam water is used for soaking for more than 1 hour;

[0018] (13) Backwash: Use deionized water to enter from the bottom of the column, and control the flow rate at 1BV to 3BV to clean the carbon column until the outlet water conductivity is less than 800μS / cm;

[0019] (14) Quick rinse: Deionized water is introduced into the carbon column from the top, and the flow rate is controlled at 3BV~5BV. The carbon column is rinsed until the water conductivity is less than 60μS / cm and the pH is 3.8~5.3. After regeneration, the column is put into standby use.

[0020] Furthermore, in the alkali regeneration of step (4), the dilute caustic soda solution with a concentration of 2% to 5% is heated to above 80°C using 95°C hot water.

[0021] A carbon column regeneration device for syrup refining is also provided, comprising a carbon column, wherein a spider web-shaped distributor is arranged in the middle of the carbon column for discharging waste water in the carbon column.

[0022] Furthermore, three cleaning balls are installed on the top of the carbon column. The three cleaning balls are evenly distributed on the top of the carbon column at an angle of 120 degrees and are used for cleaning the inside of the carbon column.

[0023] Furthermore, steam inlets are provided at the top and bottom of the carbon column, and three high-temperature steam regenerations and one alkali solution regeneration are adopted during the regeneration process to make the granular carbon regeneration more complete.

[0024] Furthermore, a dilute caustic soda inlet is provided at the bottom of the carbon column so as to regenerate the carbon column using dilute caustic soda;

[0025] A dilute alkali mixer is also provided, and a 2% to 5% concentration dilute caustic soda solution is prepared by mixing 30% concentrated caustic soda: deionized water in a mass ratio of 1:5 to 1:14 through a mixer.

[0026] Furthermore, a dilute sulfuric acid inlet is provided at the bottom of the carbon column so that the carbon column can be regenerated using dilute sulfuric acid liquid;

[0027] A dilute sulfuric acid mixer is also provided, and a 2% to 5% concentration dilute sulfuric acid solution is prepared by mixing 40% concentrated sulfuric acid: deionized water in a mass ratio of 1:7 to 1:19 through the mixer.

[0028] Furthermore, two temperature sensors are provided on the carbon column, located at the upper and lower parts of the carbon column, respectively, for detecting and controlling the real-time temperature of the carbon column;

[0029] A pressure sensor is provided at the top and the bottom of the carbon column respectively for detecting the top and bottom pressures.

[0030] Furthermore, a tuning fork switch is provided at 20 cm to 50 cm above and below the distributor in the middle of the carbon column, respectively, for detecting and controlling the liquid level in the carbon column.

[0031] Furthermore, a water retaining plate is arranged just above the inside of the carbon column, which can prevent the granular carbon from being directly washed out during the backwashing process, and the backwashing water is discharged from the side of the water retaining plate with impurities.

[0032] The beneficial effects of the present invention are:

[0033] 1. During the gradual adsorption process of the carbon column, impurities such as protein in the syrup will gradually block the pores of the activated carbon, thereby affecting its adsorption effect. In the regeneration process disclosed in the present invention, the carbon column is soaked in saturated salt water, which can precipitate the protein to a certain extent, and then the carbon column is cleaned with alkaline solution above 80°C. During the cleaning process, a Roots blower is used to introduce air to make the alkaline solution and the granular carbon tumble. The friction between the granular carbon and the granular carbon and the alkaline solution is helpful for protein desorption. These alkaline solutions will cause the protein to denature and condense, which is more conducive to the washing out of impurities such as protein; at the same time, these dilute alkalis will react with 5-hydroxymethylfurfural, acetaldehyde and other substances adsorbed by the carbon column, thereby removing these substances and improving the regeneration effect.

[0034] 2. In the regeneration equipment and process disclosed in the present invention, two thermometers are installed at the top and bottom of the carbon column, and the carbon column is heated and stripped by one steam preheating and two high-temperature steams: the first high-temperature steam preheats the carbon column and enters from the bottom of the carbon column, so that the carbon column begins to expand after being heated, which is helpful for the subsequent desorption of impurities such as 2-Ap; the second and third high-temperature steam enter from the top and bottom of the carbon column respectively, and the carbon column is heated more evenly. The carbon column continues to expand due to heat, which is more helpful for blowing off impurities such as 2-Ap and improving the regeneration effect. After three high-temperature steam heatings, the carbon column is heated more evenly, the carbon column expansion rate is improved, and the 2-Ap desorption effect is better. Compared with the conventional chemical regeneration method, the sugar volume after regeneration is increased by more than 50%, thereby improving the regeneration efficiency and effect of the carbon column.

[0035] 3. The present invention uses low-cost energy and reagents such as steam, caustic soda, sulfuric acid, and water to complete the regeneration of the carbon column, without the need to use high-investment, high-energy-consuming equipment such as incinerators, thereby saving fixed investment and reducing regeneration costs.

[0036] 4. The present invention improves the durability of the equipment and the regeneration efficiency of the carbon column by customizing components such as the distributor, the middle row, the double thermometers, and the double tuning fork switch, thereby reflecting the practicality of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 is a carbon column regeneration process diagram of the present invention;

[0039] Figure 2 It is a front view structural schematic diagram of the carbon column regeneration device of the present invention;

[0040] Figure 3 It is a schematic diagram of the top view of the structure of the carbon column regeneration device of the present invention. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, and preferably the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0043] See also Figures 1 to 3 The present invention provides a method for regenerating a carbon column for syrup refining, comprising the following steps:

[0044] (1) Column cutting: Detect the 2-Ap of the carbon column output. When 2-Ap ≥ 0.5 ppb is detected, stop feeding and discharging the carbon column and switch the carbon column to the cleaning state;

[0045] (2) Backwashing: Use deionized water to backwash the granular carbon. The backwash flow rate is controlled at 3BV to 5BV. The backwash time is more than 2 hours until the effluent water is not obviously turbid.

[0046] (3) Soaking in salt water: Press 3-6 bar compressed air into the top of the column to remove the remaining water in the column. Then, let saturated salt water enter the carbon column from the bottom to completely soak the granular carbon for more than 30 minutes.

[0047] (4) Alkali regeneration: A 2% to 5% dilute sodium hydroxide solution is heated to above 80°C using 95°C hot water and then enters the carbon column from the bottom of the column. The dilute alkali flow rate is controlled at 1BV to 2BV.

[0048] (5) Air tumbling: Use Roots blower to tumble 16m 3 / min~19m 3 / min air is pumped into the carbon column from the bottom to make the alkali and granular carbon tumble for more than 2 hours;

[0049] (6) Backwashing: Use deionized water to backwash the carbon column. The flow rate of deionized water is controlled at 3BV to 5BV. Wash until the pH of the effluent is less than 12.

[0050] (7) Water pressure: Pressurize 3-6 bar compressed air from the top of the column to press the water in the column out from the distributor in the middle of the carbon column. The water level stops when it reaches between the two tuning fork switches.

[0051] (8) Acid regeneration: A 2% to 5% dilute sulfuric acid solution is introduced into the carbon column from the bottom at a rate of 1BV to 2BV for 15min to 30min;

[0052] (9) Water pressure: Press 3-6 bar compressed air into the top of the column to clean the water in the column;

[0053] (10) Steam preheating: Steam enters from the bottom of the column and is discharged from the top of the column. When the temperature sensor inside the column reaches above 85°C, the steam is stopped;

[0054] (11) Steam inlet: Steam is introduced from the top of the column and discharged from the bottom of the column. The temperature sensor at the bottom of the column reaches above 110°C and the steam inlet is maintained for more than 1 hour;

[0055] (12) Steam inlet: Steam is introduced from the bottom of the column again, and steam is discharged from the top of the column. When the temperature sensor inside the column reaches above 110°C, the steam is stopped and the steam water is used for soaking for more than 1 hour;

[0056] (13) Backwash: Use deionized water to enter from the bottom of the column, and control the flow rate at 1BV to 3BV to clean the carbon column until the outlet water conductivity is less than 800μS / cm;

[0057] (14) Quick rinse: Deionized water is introduced into the carbon column from the top, and the flow rate is controlled at 3BV~5BV. The carbon column is rinsed until the water conductivity is less than 60μS / cm and the pH is 3.8~5.3. After regeneration, the column is put into standby use.

[0058] Preferably, in the alkali regeneration of step (4), the dilute caustic soda solution with a concentration of 2% to 5% is heated to above 80°C using 95°C hot water.

[0059] A carbon column regeneration device for syrup refining is also provided, comprising a carbon column, wherein three carbon columns are arranged in parallel, and the three carbon columns correspond to a primary refining carbon column, a secondary refining carbon column and a spare carbon column;

[0060] A spider web-shaped distributor is set in the middle of the carbon column to discharge the wastewater in the carbon column;

[0061] Preferably, three cleaning balls are installed on the top of the carbon column. The three cleaning balls are evenly distributed on the top of the carbon column at 120 degrees, and the three cleaning balls are connected to deionized water pipelines through pipes for cleaning the inside of the carbon column.

[0062] Preferably, steam inlets are provided at the top and bottom of the carbon column, and the steam pipeline is connected to the preset steam inlets at the top and bottom of the carbon column through a pipeline. During the regeneration process, three high-temperature steam regenerations and one alkaline solution regeneration are adopted to make the granular carbon regeneration more complete.

[0063] Preferably, a dilute caustic soda inlet is provided at the bottom of the carbon column so as to regenerate the carbon column using dilute caustic soda;

[0064] A dilute alkali mixer is also provided, which is connected to a dilute caustic soda inlet via a pipeline, and an alkali inlet temperature-increasing heat exchanger is provided on the pipeline of the dilute alkali mixer. A 2% to 5% concentration dilute caustic soda solution is prepared by mixing 30% concentrated caustic soda: deionized water at a mass ratio of 1:5 to 1:14 through the mixer.

[0065] Preferably, a dilute sulfuric acid inlet is provided at the bottom of the carbon column so that the carbon column can be regenerated using dilute sulfuric acid solution;

[0066] A dilute sulfuric acid mixer is also provided, and a 2% to 5% concentration dilute sulfuric acid solution is prepared by mixing 40% concentrated sulfuric acid: deionized water in a mass ratio of 1:7 to 1:19 through the mixer.

[0067] Preferably, two temperature sensors are provided on the carbon column, respectively located at the upper and lower parts of the carbon column, for detecting and controlling the real-time temperature of the carbon column;

[0068] A pressure sensor is provided at the top and the bottom of the carbon column respectively for detecting the top and bottom pressures.

[0069] Preferably, a tuning fork switch is provided at 20 cm to 50 cm above and below the distributor in the middle of the carbon column, respectively, for detecting and controlling the liquid level in the carbon column.

[0070] Preferably, a water baffle is provided just above the interior of the carbon column to prevent the granular carbon from being directly flushed out during the backwashing process, and the backwash water is discharged from the side of the water baffle with impurities.

[0071] Embodiment 1:

[0072] The production process flow chart of this embodiment is as follows Figure 1 As shown, the equipment manufacturing diagram is as follows Figure 2 and Figure 3 The specific steps are as follows:

[0073] (1) Column switching: The carbon column continues to pass sugar, and the 2-Ap of the carbon column output is detected. At 483BV, the 2-Ap detected is 0.534ppb, so the carbon column needs to be switched. Switch the carbon column feed and discharge to other carbon columns, stop the carbon column feed and discharge, and cut off its feed and discharge valves to switch to the cleaning state;

[0074] (2) Backwashing: Deionized water is pumped into the carbon column from the bottom to backwash the granular carbon. The backwash flow rate is controlled at 3BV. After the backwash water fills the carbon column, it is discharged from the top of the carbon column. After the backwash time is 2.5 hours, the effluent is not obviously turbid, and the backwashing is stopped;

[0075] (3) Salt water soaking: 3 bar compressed air is injected from the top of the column to remove the remaining water in the column. Then saturated salt water is injected into the carbon column from the bottom to completely soak the granular carbon for 30 minutes;

[0076] (4) Alkali regeneration: 30% caustic soda solution and deionized water are mixed in a mass ratio of 1:5 in a dilute alkali mixer to obtain a 5% dilute caustic soda solution. Then, 95°C hot water is used to heat the dilute alkali solution to 82°C. Open the dilute alkali valve at the bottom of the carbon column and allow the dilute alkali to enter the carbon column from the bottom of the column. The flow rate is controlled at 1BV.

[0077] (5) Air tumbling: Use Roots blower to tumble 16m 3 / min air flux is pumped into the carbon column from the bottom to make the alkali and granular carbon tumble for 2 hours;

[0078] (6) Backwashing: After the soaking is completed, the diluted alkali solution is drained and the carbon column is backwashed with deionized water from the bottom of the column and the top of the column. The flow rate of deionized water is controlled at 3 BV and the washing is stopped when the pH of the effluent is 10;

[0079] (7) Water pressure: 3 bar compressed air is injected from the top of the column to press the water in the column out from the distributor in the middle of the carbon column. The water level stops between the two tuning fork switches.

[0080] (8) Acid regeneration: 40% concentrated sulfuric acid solution is mixed in a dilute sulfuric acid mixer at a mass ratio of concentrated sulfuric acid to deionized water = 1:7 to obtain a 5% dilute sulfuric acid solution. Open the dilute sulfuric acid valve at the bottom of the carbon column and allow the dilute sulfuric acid to enter the carbon column from the bottom of the column. The flow rate is controlled at 1 BV and continued for 15 min.

[0081] (9) Water compression: 3 bar compressed air is pressed into the top of the carbon column, and the water in the column is gradually discharged from the bottom. When there is almost no water discharged from the bottom, stop compressing the air;

[0082] (10) Steam preheating: Open the steam valve at the bottom of the column and let steam in from the bottom of the column to heat the carbon column. After the steam fills the carbon column, it is discharged from the top of the column. When the temperature sensor in the column detects 87°C, stop the steam.

[0083] (11) Steam inlet: Open the steam valve at the top of the column and let steam in from the top of the column to heat the carbon column. After the steam has filled the carbon column, it is discharged from the bottom of the column. Maintain steam inlet for 1.5 hours. At this time, the temperature sensor at the bottom of the column detects 117°C and stops steam inlet.

[0084] (12) Steam inlet: Steam is introduced again from the bottom of the column, and steam is discharged from the top of the column. When the temperature sensor inside the column reaches 115°C, the steam is stopped and the steam water is used for soaking for 1.5 hours;

[0085] (13) Backwash: Use deionized water to enter the column from the bottom for slow flushing, with the flow rate controlled at 1 BV, and stop when the outlet water conductivity reaches 756 μS / cm;

[0086] (14) Quick rinse: Deionized water is introduced from the top of the carbon column with a flow rate controlled at 3 BV until the conductivity of the carbon column outlet water is 55 μS / cm and the pH is 5.3, and regeneration is completed;

[0087] (15) Carbon column refining: The F55 fructose solution was refined using the carbon column regenerated by the above method. The feed 2-Ap was 7.447 ppb and the color value was 16.95. The carbon column output 2-Ap < 0.2 ppb and the color value was 7.17. When the BV of the sugar reached 568 BV, the output 2-Ap was 0.532 ppb and the color value was 13.69.

[0088] Comparing the 2-Ap and color values ​​of the input and output materials, the carbon column using the above-mentioned regeneration process has a better effect in removing 2-Ap, pigments, etc. in the sugar solution, and the sugar passing volume of the carbon column can reach more than 500BV (limited to 2-Ap of 0.5ppb).

[0089] Embodiment 2:

[0090] The production process flow chart of this embodiment is as follows Figure 1 As shown, the equipment manufacturing diagram is as follows Figure 2 and Figure 3 The specific steps are as follows:

[0091] (1) Column switching: The carbon column continues to pass sugar, and the 2-Ap of the carbon column output is detected. At 570BV, the 2-Ap detected is 0.527ppb, so the carbon column needs to be switched. Switch the carbon column feed and discharge to other carbon columns, stop the carbon column feed and discharge, and cut off its feed and discharge valves to switch to the cleaning state;

[0092] (2) Backwashing: Deionized water is used to backwash the granular carbon. The backwash flow rate is controlled at 5 BV. After the backwash water fills the carbon column, it is discharged from the top of the carbon column. After the backwash time is 2 hours, the effluent is not obviously turbid, and the backwashing is stopped;

[0093] (3) Salt water soaking: 6 bar compressed air is pressed into the top of the column to remove the remaining water in the column. Then saturated salt water is introduced into the carbon column from the bottom to completely soak the granular carbon for 60 minutes;

[0094] (4) Alkali regeneration: 30% caustic soda solution and deionized water are mixed in a mass ratio of 1:14 in a dilute alkali mixer to obtain a 2% dilute caustic soda solution. Then, 95°C hot water is used to heat the dilute alkali solution to 85°C. The dilute alkali valve at the bottom of the carbon column is opened to allow the dilute alkali to enter the carbon column from the bottom of the column, with the flow rate controlled at 2BV;

[0095] (5) Air tumbling: Use a Roots blower to pump air at a flux of 19 m3 / min into the carbon column from the bottom to cause the alkali and granular carbon to tumble for 3 h;

[0096] (6) Backwashing: After the soaking is completed, the diluted alkali solution is drained and the carbon column is backwashed with deionized water from the bottom of the column and the top of the column. The flow rate of deionized water is controlled at 5 BV and the washing is stopped when the pH of the effluent is 9;

[0097] (7) Water pressure: 6 bar compressed air is injected from the top of the column to press the water in the column out from the distributor in the middle of the carbon column. The water level stops between the two tuning fork switches.

[0098] (8) Acid regeneration: 40% concentrated sulfuric acid solution was mixed in a dilute sulfuric acid mixer at a mass ratio of concentrated sulfuric acid to deionized water = 1:19 to obtain a 2% dilute sulfuric acid solution. The dilute sulfuric acid valve at the bottom of the carbon column was opened to allow the dilute sulfuric acid to enter the carbon column from the bottom of the column at a flow rate of 2 BV for 30 min.

[0099] (9) Water compression: 6 bar compressed air is pressed into the top of the carbon column, and the water in the column is gradually discharged from the bottom. When there is almost no water discharged from the bottom, stop compressing the air;

[0100] (10) Steam preheating: Open the steam valve at the bottom of the column, and let steam in from the bottom of the column to heat the carbon column. After the steam fills the carbon column, it is discharged from the top of the column. When the temperature sensor in the column detects 88°C, stop the steam.

[0101] (11) Steam inlet: Open the steam valve at the top of the column and let steam in from the top of the column to heat the carbon column. After the steam has filled the carbon column, it is discharged from the bottom of the column. Maintain steam inlet for 1.5 hours. At this time, the temperature sensor at the bottom of the column detects 115°C and stops steam inlet.

[0102] (12) Steam inlet: Steam is introduced again from the bottom of the column, and steam is discharged from the top of the column. When the temperature sensor inside the column reaches above 114°C, the steam is stopped and the steam water is used for soaking for 1.5 hours;

[0103] (13) Backwash: Use deionized water to enter the column from the bottom for slow flushing, with the flow rate controlled at 3 BV, and stop when the outlet water conductivity reaches 731 μS / cm;

[0104] (14) Quick rinse: Deionized water is introduced from the top of the carbon column with a flow rate controlled at 5 BV until the conductivity of the carbon column outlet water is 52 μS / cm and the pH is 3.8, and regeneration is completed;

[0105] (13) Carbon column refining: The F55 fructose solution was refined using the carbon column regenerated by the above method. The feed 2-Ap was 6.957 ppb and the color value was 17.14. The carbon column output 2-Ap < 0.2 ppb and the color value was 7.35. When the BV of the sugar reached 541 BV, the output 2-Ap was 0.489 ppb and the color value was 13.94.

[0106] Comparing the 2-Ap and color values ​​of the input and output materials, the carbon column using the above-mentioned regeneration process has a better effect in removing 2-Ap, pigments, etc. in the sugar solution, and the sugar passing volume of the carbon column can reach more than 500BV (limited to 2-Ap of 0.5ppb).

[0107] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for regenerating a carbon column for syrup refining, characterized in that: The following steps are involved: (1) Column cutting: Detect the 2-Ap of the carbon column output. When 2-Ap ≥ 0.5 ppb is detected, stop feeding and discharging the carbon column and switch the carbon column to the cleaning state; (2) Backwashing: backwash the carbon column with deionized water, control the backwash flow rate at 3BV to 5BV, and backwash for more than 2 hours until the effluent is not obviously turbid; (3) Soaking in salt water: Press 3-6 bar compressed air into the top of the column to remove the remaining water in the column. Then, let saturated salt water enter the carbon column from the bottom to completely soak the granular carbon for more than 30 minutes. (4) Alkali regeneration: A 2% to 5% dilute sodium hydroxide solution is heated to above 80°C using 95°C hot water and then enters the carbon column from the bottom of the column. The dilute alkali flow rate is controlled at 1BV to 2BV. (5) Air tumbling: Use Roots blower to tumble 16m 3 / min~19m 3 / min air is pumped into the carbon column from the bottom to make the alkali and granular carbon tumble for more than 2 hours; (6) Backwashing: Use deionized water to backwash the carbon column. The flow rate of deionized water is controlled at 3BV to 5BV. Wash until the pH of the effluent is less than 12. (7) Water pressure: Pressurize 3-6 bar compressed air from the top of the column to press the water in the column out from the distributor in the middle of the carbon column. The water level stops when it reaches between the two tuning fork switches. (8) Acid regeneration: A 2% to 5% dilute sulfuric acid solution is introduced into the carbon column from the bottom at a rate of 1BV to 2BV for 15min to 30min; (9) Water pressure: Press 3-6 bar compressed air into the top of the column to clean the water in the column; (10) Steam preheating: Steam enters from the bottom of the column and is discharged from the top of the column. When the temperature sensor inside the column reaches above 85°C, the steam is stopped; (11) Steam inlet: Steam is introduced from the top of the column and discharged from the bottom of the column. The temperature sensor at the bottom of the column reaches above 110°C and the steam inlet is maintained for more than 1 hour; (12) Steam inlet: Steam is introduced from the bottom of the column again, and steam is discharged from the top of the column. When the temperature sensor inside the column reaches above 110°C, the steam is stopped and the steam water is used for soaking for more than 1 hour; (13) Backwash: Use deionized water to enter from the bottom of the column, and control the flow rate at 1BV to 3BV to clean the carbon column until the outlet water conductivity is less than 800μS / cm; (14) Quick rinse: Deionized water is introduced into the carbon column from the top, and the flow rate is controlled at 3BV~5BV. The carbon column is rinsed until the water conductivity is less than 60μS / cm and the pH is 3.8~5.

3. After regeneration, the column is put into standby use.

2. The method for regenerating a carbon column for syrup refining according to claim 1, characterized in that: In step (4) alkali regeneration, a 2% to 5% concentration dilute caustic soda solution is heated to above 80°C using 95°C hot water.

3. A carbon column regeneration device for syrup refining, comprising a carbon column, characterized in that: There are three carbon columns arranged in parallel, and the three carbon columns correspond to a primary refined carbon column, a secondary refined carbon column and a spare carbon column; A spider web-shaped distributor is set in the middle of the carbon column to discharge the wastewater in the carbon column.

4. The carbon column regeneration equipment for syrup refining according to claim 3, characterized in that: Three cleaning balls are installed on the top of the carbon column. The three cleaning balls are evenly distributed on the top of the carbon column at 120 degrees, and the three cleaning balls are connected to the deionized water pipeline through pipes for cleaning the inside of the carbon column.

5. The carbon column regeneration equipment for syrup refining according to claim 3, characterized in that: A steam pipeline is arranged above the carbon column, and the steam pipeline is connected to the preset steam inlets at the top and bottom of the carbon column through a pipeline. During the regeneration process, three high-temperature steam regenerations and one alkali solution heating regeneration are adopted to make the granular carbon regeneration more complete.

6. The carbon column regeneration equipment for syrup refining according to claim 3, characterized in that: A dilute caustic soda inlet is provided at the bottom of the carbon column so that the carbon column can be regenerated using dilute caustic soda; A dilute alkali mixer is also provided, which is connected to a dilute caustic soda inlet via a pipeline, and an alkali inlet temperature-increasing heat exchanger is provided on the pipeline of the dilute alkali mixer. A 2% to 5% concentration dilute caustic soda solution is prepared by mixing 30% concentrated caustic soda: deionized water at a mass ratio of 1:5 to 1:14 through the mixer.

7. The carbon column regeneration equipment for syrup refining according to claim 3, characterized in that: A dilute sulfuric acid inlet is provided at the bottom of the carbon column so that the carbon column can be regenerated using dilute sulfuric acid liquid; A dilute sulfuric acid mixer is also provided, and a 2% to 5% concentration dilute sulfuric acid solution is prepared by mixing 40% concentrated sulfuric acid: deionized water in a mass ratio of 1:7 to 1:19 through the mixer.

8. The carbon column regeneration equipment for syrup refining according to claim 3, characterized in that: Two temperature sensors are arranged on the carbon column, located at the upper and lower parts of the carbon column respectively, for detecting and controlling the real-time temperature of the carbon column; A pressure sensor is provided at the top and the bottom of the carbon column respectively for detecting the top and bottom pressures.

9. The carbon column regeneration equipment for syrup refining according to claim 3, characterized in that: A tuning fork switch is arranged at 20cm to 50cm above and below the distributor in the middle of the carbon column to detect and control the liquid level in the carbon column.

10. The carbon column regeneration equipment for syrup refining according to any one of claims 3 to 9, characterized in that: A water baffle is arranged just above the inside of the carbon column to prevent the granular carbon from being directly washed out during the backwashing process. The backwash water is discharged from the side of the water baffle with impurities.

Images