A new method and apparatus for producing anti-caking baking soda

Abstract

The present application provides a new method and device for producing anti-caking baking soda, the method is to produce in a fluidized bed body device, the method is improved for the fluidized bed, two-stage fluidized bed device is used, including fluidized bed stage 1 and fluidized bed stage 2, wherein the fluidized bed stage 1 is isothermal hot air, and the effect of water absorption to reach the balance of alkali by inputting carbon dioxide effectively reduces the proportion of fine crystals, and the baking soda material is further dehydrated; the lower end of the fluidized bed stage 2 is connected with a heat exchanger cold dryer Y109 to produce cold boiling, the water-cooled heat exchange column pipe S114 is laid in the bed to form a double rapid cooling device, so that the baking soda material is rapidly cooled to normal temperature, and the anti-caking quality protection purpose is achieved.

Description

Technical Field

[0001] This invention relates to the field of powder and granular material production technology, to the production of baking soda, and particularly to a method and apparatus for preventing caking during baking soda production. Technical Background

[0002] Baking soda, also known as sodium bicarbonate, is an important chemical raw material. It is a carbonate, a white crystalline powder. It has wide applications in food additives, household cleaners, feed additives, and pharmaceuticals. During the production of baking soda, after the sodium bicarbonate is dehydrated, the surface water must be dried. Sodium bicarbonate is weakly alkaline, and the drying temperature cannot be too high. Above 100℃, baking soda easily decomposes into Na2CO3 and CO2; however, the temperature also cannot be too low. Below 80℃, drying is incomplete, and the water content on the surface of the baking soda cannot be completely removed. The residual water will be absorbed into the product, causing it to clump. The problem of baking soda clumping has always been a technical challenge in industrial production. Causes of baking soda clumping include excessively fine crystal particle size, excessively high temperature during packaging after drying, failure to dehumidify promptly and package immediately, and improper stacking after packaging.

[0003] Chinese patent CN 116462211 A discloses a method for producing anti-caking baking soda. Instead of adding a vacuum washing process before the drying step of the sodium bicarbonate slurry in the original baking soda production process, it starts from the crystal structure and adds a vacuum washing process before the drying of wet baking soda. Through the washing principle, the ultrafine particles and the fine crystal particles attached to the large particles in the baking soda product are dissolved, and the lamellae, powder crystals and needle crystals are washed away, reducing the crystal bridges and capillary adsorption effects between crystals. However, the resulting 80% particle distribution range is 90-280um, which still cannot completely solve the problem of fine powder agglomeration.

[0004] Chinese patent CN 113023755 A discloses a method for preventing sodium bicarbonate from caking. The method involves adding feldspar powder as an anti-caking agent to sodium bicarbonate powder and mixing it evenly. This method can prevent sodium bicarbonate products from caking and maintain good dispersibility of the product for a long time, effectively preventing sodium bicarbonate from caking.

[0005] Chinese patent CN105016363B discloses a device for preventing caking in the production of baking soda. It employs a vertical plate-type powder flow cooler integrated with a cyclone screen for cooling dried baking soda and preventing caking. However, its process structure is complex, its operation and maintenance costs are high, and it suffers from significant energy consumption drawbacks.

[0006] This invention provides a novel method and apparatus for producing non-caking baking soda, which specifically solves the problem of caking in baking soda production, resulting in a product with large and uniform particle size, effectively improving product quality. Summary of the Invention

[0007] The purpose of this invention is to provide a new method and apparatus for producing anti-caking baking soda, so as to solve the technical problem of baking soda agglomeration during production and effectively improve product quality.

[0008] This invention provides a novel method for producing anti-caking baking soda, wherein the method involves production within a fluidized bed, the fluidized bed comprising a first fluidized bed section and a second fluidized bed section; the method includes the following steps:

[0009] Step 1: Fluidized Bed Section 1: Input the baking soda material from the baking soda transfer tank A107 into the fluidized bed section Q101-1. Set the temperature of the fluidized bed section to be the same as that of the baking soda material. Open the flow control valve of the carbon dioxide storage tank C104 and introduce an appropriate amount of carbon dioxide. The baking soda material will further react and remove water under the carbon dioxide condition.

[0010] Step 2: Fluidized bed stage 2: The sodium bicarbonate material that was further dried and dehydrated in step 1 is introduced from fluidized bed stage 1 Q101-1 into fluidized bed stage 2 Q101-2 for rapid cooling, cooling the product to room temperature;

[0011] Step 3: Package the rapidly cooled baking soda from Step 2, ensuring the temperature inside the packaging is at room temperature.

[0012] Furthermore, the new method for producing anti-caking baking soda, specifically includes step one as follows:

[0013] Step 1: First, turn on the first stage of the Q101 fluidized bed in the Q101 fluidized bed body, and then turn on the X102 circulating blower to input the sodium bicarbonate material that has been dried by hot air in the sodium bicarbonate transfer tank A107 and is about to be further dried into the first stage of the fluidized bed Q101-1.

[0014] Step 2: Open the flow control valve of carbon dioxide storage tank C104, adjust the flow rate, and allow the sodium bicarbonate material input into the fluidized bed section in Step 1 to be further dried in the bed and further reacted to remove water under carbon dioxide conditions. Excess carbon dioxide enters the gas-liquid separator Y105 through cyclone dust collector Y103. The condensate tank Y106 is used to store the condensate from Y105, and the separated carbon dioxide and hot gas are sent to the first stage of fluidized bed Q101-1 for recycling by circulating fan X102.

[0015] Step two specifically includes:

[0016] Step 3: The sodium bicarbonate material that has been further dried and dehydrated in Step 2 of Step 1 is introduced from the first fluidized bed section Q101-1 into the second fluidized bed section Q101-2 for rapid cooling. At the same time, the cooling blower X108 is turned on and the heat exchanger refrigerated dryer Y109 is turned on. The condensate inlet and outlet valves are used to remove the wet water and purify the air before it enters the second fluidized bed section. The condensate transfer tank Y110 is used to store the condensate from the tube heat exchanger refrigerated dryer Y109. Water-cooled heat exchange tubes S114 are laid in the second fluidized bed section to perform double rapid cooling of the sodium bicarbonate material to room temperature.

[0017] Step three specifically includes:

[0018] Step 4: Package the rapidly cooled baking soda from Step 3 in Step 2 above, with the temperature inside the packaging bag at 25-30℃; the generated dust is separated by the Y111 cyclone dust collector, and the tail dust enters the P112 pulse bag dust collector for dust collection, while the filtered exhaust gas is extracted and discharged by the P113 tail-end induced draft fan.

[0019] In some embodiments provided by the present invention, a new method for producing anti-caking baking soda is preferably provided, wherein the temperature of the baking soda material in the baking soda transfer tank A107 is 45-60℃ and the inherent water content is 1-2%.

[0020] Preferably, the C104 flow control valve of the carbon dioxide storage tank adjusts the carbon dioxide flow rate to 35L~45L per hour.

[0021] Another object of the present invention is to provide a fluidized bed body device for producing the anti-caking sodium bicarbonate as described above. The fluidized bed body device includes a first fluidized bed section and a second fluidized bed section. The first fluidized bed section is connected to a carbon dioxide storage tank C104 and carbon dioxide gas can be introduced into it through the carbon dioxide storage tank C104. The lower end of the second fluidized bed section is connected to a heat exchanger refrigerated dryer Y109 to generate cold boiling, and water-cooled heat exchange tubes S114 are laid inside the bed.

[0022] Beneficial Effects: This invention provides a new method and apparatus for producing anti-caking baking soda, solving the technical problem of baking soda agglomeration and effectively improving product quality. The method employs a specific modification to the fluidized bed, utilizing a two-stage fluidized bed device. The first stage uses hot air at the same temperature, further dehydrating the baking soda material by introducing carbon dioxide to absorb water and balance the alkali; excess carbon dioxide can be recycled. The second stage connects to a heat exchanger / refrigerated dryer Y109 at its lower end to generate cold boiling. Water-cooled heat exchange tubes S114 are laid inside the bed, rapidly cooling the baking soda material to room temperature, further achieving the purpose of preventing agglomeration and preserving quality.

[0023] When the baking soda material enters the first stage of the fluidized bed, hot air is set to the same temperature as the baking soda material and an appropriate amount of carbon dioxide is added to the first stage of the fluidized bed to balance the total alkali content. The water is then drained using the carbon dioxide water absorption reaction to remove the residual moisture in the baking soda material to a moisture content as low as 0.05%~0.1%, effectively reducing the inherent moisture content of the baking soda material by 1-2%.

[0024] Meanwhile, the inventors unexpectedly discovered that during the process of introducing carbon dioxide to absorb water in the first stage of the fluidized bed, the hydrogen ion concentration in the baking soda material was effectively reduced, balancing the weakly alkaline properties of baking soda. In the process of balancing soda ash, fine crystals were polymerized with the same ions, significantly reducing the proportion of fine crystals. Experimental results show that the method for producing anti-caking baking soda described in this invention produces baking soda with a particle size range of 120-300 mesh, which reduces the cooling rate by 15% compared to the traditional 50% cooling rate of fluidized bed forced air cooling, greatly reducing the amount of fine powder by 35%. The resulting baking soda product has stable performance and flows smoothly without caking.

[0025] After the baking soda material enters the second stage of the fluidized bed, the lower end of the second stage is connected to the heat exchanger refrigerated dryer Y109 to generate cold air boiling. Water-cooled heat exchange tubes S114 are laid inside the bed to form a rapid cooling section, which provides double rapid cooling of the baking soda material. This ensures that the product enters the packaging at room temperature, which is 20-25°C lower than the traditional packaging at 50-60°C. This effectively suppresses the adverse packaging conditions caused by thermal expansion and contraction and solves the problem of preventing baking soda from clumping. Attached Figure Description

[0026] Figure 1 Production process flow diagram for preventing baking soda from caking

[0027] Among them, Q101 is the fluidized bed body; Q101-1 is the first stage of the fluidized bed; Q101-2 is the second stage of the fluidized bed; X102 is the circulating induced draft fan; Y103 is the cyclone dust collector; C104 is the carbon dioxide storage tank; Y105 is the water separator; Y106 is the condensate tank; A107 is the sodium bicarbonate transfer tank; X108 is the cooling blower; Y109 is the heat exchanger refrigerated dryer; Y110 is the condensate transfer storage tank; S114 is the water-cooled heat exchanger tube; Y111 is the cyclone dust collector; P112 is the pulse bag dust collector; and P113 is the tail-end induced draft fan. Specific Implementation

[0028] The invention will be further described in detail below with reference to the production flow diagram. Implementation

[0029] During the production process:

[0030] Step 1: First, turn on the first stage of the Q101 fluidized bed in the Q101 fluidized bed body, then turn on the X102 circulating blower to input the sodium bicarbonate material that has been dried by hot air in the sodium bicarbonate transfer tank A107 and is about to be further dried into the first stage of the fluidized bed Q101-1.

[0031] Step 2: Open the flow control valve of carbon dioxide storage tank C104, adjust the flow rate, and allow the sodium bicarbonate material input into the fluidized bed section in Step 1 to be further dried in the bed and further reacted to remove water under carbon dioxide conditions. Excess carbon dioxide enters the gas-liquid separator Y105 via cyclone dust collector Y103. The condensate tank Y106 is used to store the condensate from Y105, and the separated carbon dioxide and hot gas are sent to the first stage of fluidized bed Q101-1 for recycling by circulating fan X102.

[0032] Step 3: The sodium bicarbonate material further dried and dehydrated in Step 2 is transferred from the first fluidized bed section Q101-1 to the second fluidized bed section Q101-2 for rapid cooling. At the same time, the cooling blower X108 is turned on and the heat exchanger refrigerated dryer Y109 is turned on. The condensate inlet and outlet valves are used to remove moisture and purify the air before it enters the second fluidized bed section. The condensate transfer tank Y110 is used to store the condensate from the tube heat exchanger refrigerated dryer Y109. Water-cooled heat exchange tubes S114 are laid in the second fluidized bed section to provide double rapid cooling of the sodium bicarbonate material to room temperature.

[0033] Step 4: Pack the rapidly cooled baking soda from Step 3 into a package, with the temperature inside the packaging bag maintained at 25-30℃; the generated dust is separated by the Y111 cyclone dust collector, and the tail dust enters the P112 pulse bag dust collector for collection, while the filtered exhaust gas is extracted and discharged by the P113 tail-end induced draft fan.

[0034] Example 1

[0035] A new method for producing anti-caking baking soda:

[0036] Step 1: Turn on the first stage of the Q101 fluidized bed in the Q101 fluidized bed body, and then turn on the X102 circulating blower to input the sodium bicarbonate material (material temperature at 45℃ and moisture content at 2%) from the sodium bicarbonate transfer tank A107 into the first stage of the fluidized bed Q101-1.

[0037] Step 2: Open the flow control valve of carbon dioxide storage tank C104 and adjust the flow rate (35L per hour) to allow the sodium bicarbonate material input into the fluidized bed section in Step 1 to be further dried in the bed. The temperature of the fluidized bed section is set to 45℃. Under the condition of carbon dioxide, further reaction and dehydration will occur. The excess carbon dioxide will enter the gas-liquid separator Y105 through the cyclone dust collector Y103. The condensate tank Y106 is used to store the condensate from Y105. The separated carbon dioxide and hot gas are sent to the fluidized bed section Q101-1 for recycling by the circulating fan X102.

[0038] Step 3: The sodium bicarbonate material further dried and dehydrated in Step 2 (material temperature 45℃, moisture content 0.1%) is transferred from the first fluidized bed section Q101-1 to the second fluidized bed section Q101-2 for rapid cooling. At the same time, the cooling blower X108 is turned on and the heat exchanger refrigerated dryer Y109 is turned on. The condensate inlet and outlet valves are used to remove moisture and purify the air before it enters the second fluidized bed section. The condensate transfer tank Y110 is used to store the condensate from the tube heat exchanger refrigerated dryer Y109. Water-cooled heat exchange tubes S114 are laid in the second fluidized bed section to perform double rapid cooling on the sodium bicarbonate material, and the finished product temperature is cooled to room temperature.

[0039] Step 4: Pack the rapidly cooled baking soda from Step 3 into a package, with the temperature inside the packaging bag at 25℃; the generated dust is separated by the Y111 cyclone dust collector, and the tail dust enters the P112 pulse bag dust collector for collection, while the filtered exhaust gas is extracted and discharged by the P113 tail-end induced draft fan.

[0040] Example 2

[0041] A new method for producing anti-caking baking soda:

[0042] Step 1: Turn on the first stage of the Q101 fluidized bed in the Q101 fluidized bed body, and then turn on the X102 circulating blower to input the sodium bicarbonate material (material temperature at 60℃ and moisture content at 1%) from the sodium bicarbonate transfer tank A107 into the first stage of the fluidized bed Q101-1.

[0043] Step 2: Open the flow control valve of carbon dioxide storage tank C104 and adjust the flow rate (45L per hour) to further dry the sodium bicarbonate material fed into the fluidized bed section in Step 1. The temperature of the fluidized bed section is set to 60℃. Under the condition of carbon dioxide, further reaction and dehydration will occur. The excess carbon dioxide will enter the gas-liquid separator Y105 through the cyclone dust collector Y103. The condensate tank Y106 is used to store the condensate from Y105. The separated carbon dioxide and hot gas are sent to the fluidized bed section Q101-1 for recycling by the circulating fan X102.

[0044] Step 3: The sodium bicarbonate material further dried and dehydrated in Step 2 (material temperature 60℃, moisture content 0.05%) is transferred from the first fluidized bed section Q101-1 to the second fluidized bed section Q101-2 for rapid cooling. At the same time, the cooling blower X108 is turned on and the heat exchanger refrigerated dryer Y109 is turned on. The condensate inlet and outlet valves are used to remove moisture and purify the air before it enters the second fluidized bed section. The condensate transfer tank Y110 is used to store the condensate from the tube heat exchanger refrigerated dryer Y109. Water-cooled heat exchange tubes S114 are laid in the second fluidized bed section to perform double rapid cooling on the sodium bicarbonate material, cooling the finished product temperature to below 30 degrees Celsius.

[0045] Step 4: Pack the rapidly cooled baking soda from Step 3 into a package, with the temperature inside the packaging bag at 30℃; the generated dust is separated by the Y111 cyclone dust collector, and the tail dust enters the P112 pulse bag dust collector for collection, while the filtered exhaust gas is extracted and discharged by the P113 tail-end induced draft fan.

[0046] Comparison Example

[0047] The process and steps are the same as in Implementation 1, but in step 2, the flow control valve of carbon dioxide storage tank C104 is not opened, so that no carbon dioxide gas flow is introduced into the fluidized bed section.

[0048]

[0049] Experimental results show that the method for producing anti-caking baking soda described in this invention produces baking soda with a particle size range of 120-300 mesh. Compared with the traditional fluidized bed forced air cooling method, the cooling rate is reduced from 50% to 15% and 10%, respectively. This greatly reduces the amount of fine powder, and the resulting baking soda product has stable performance, flows smoothly, and does not caking.

[0050] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent transformations or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A novel method for producing anti-caking baking soda, wherein the method involves production within a fluidized bed body, the fluidized bed body comprising a first fluidized bed section and a second fluidized bed section; characterized in that, Includes the following steps: Step 1: Fluidized Bed Section 1: Input the baking soda material from the baking soda transfer tank A107 into the fluidized bed section Q101-1. Set the temperature of the fluidized bed section to be the same as that of the baking soda material. Open the flow control valve of the carbon dioxide storage tank C104 and introduce an appropriate amount of carbon dioxide. The baking soda material will further react and remove water under the carbon dioxide condition. Step 2: Fluidized bed stage 2: The sodium bicarbonate material that was further dried and dehydrated in step 1 is introduced from fluidized bed stage 1 Q101-1 into fluidized bed stage 2 Q101-2 for rapid cooling, cooling the product to room temperature; Step 3: Package the rapidly cooled baking soda from Step 2, ensuring the temperature inside the packaging is at room temperature; Step one specifically includes: Step 1: First, turn on the first stage of the Q101 fluidized bed in the Q101 fluidized bed body, then turn on the X102 circulating blower to input the sodium bicarbonate material that has been dried by hot air in the sodium bicarbonate transfer tank A107 and is about to be further dried into the first stage of the fluidized bed Q101-1. Step 2: Open the flow control valve of carbon dioxide storage tank C104, adjust the flow rate, and allow the sodium bicarbonate material input into the fluidized bed section in Step 1 to be further dried in the bed and further reacted to remove water under the condition of carbon dioxide. The excess carbon dioxide enters the gas-liquid separator Y105 through the cyclone dust collector Y103. The condensate tank Y106 is used to store the condensate from Y105, and the separated carbon dioxide and hot gas are sent to the first stage of fluidized bed Q101-1 for recycling by the circulating fan X102. Step two specifically includes: Step 3: The sodium bicarbonate material that has been further dried and dehydrated in Step 2 of Step 1 is transferred from Fluidized Bed Section 1 (Q101-1) to Fluidized Bed Section 2 (Q101-2) for rapid cooling. At the same time, the cooling blower X108 is turned on and the heat exchanger refrigerated dryer Y109 is turned on. The condensate inlet and outlet valves are used to remove moisture and purify the air before it enters Fluidized Bed Section 2. The condensate transfer tank Y110 is used to store the condensate from the tube heat exchanger refrigerated dryer Y109. Water-cooled heat exchange tubes S114 are laid in Fluidized Bed Section 2 to rapidly cool the sodium bicarbonate material to room temperature. Step three specifically includes: The rapidly cooled baking soda from step 3 of step 2 above is packaged, with the temperature inside the packaging belt at 25-30℃; the generated dust is separated by the Y111 cyclone dust collector, and the tail dust enters the P112 pulse bag dust collector for dust collection, while the filtered exhaust gas is extracted and discharged by the P113 tail-end induced draft fan.

2. A novel method for producing anti-caking baking soda according to claim 1, characterized in that, The temperature of the baking soda material in the baking soda transfer tank A107 is 45-60℃, and the inherent water content is 1-2%.

3. A new method for producing anti-caking sodium bicarbonate according to claim 1, wherein the carbon dioxide storage tank C104 flow control valve adjusts the carbon dioxide flow rate to 35L~45L per hour.

4. A fluidized bed apparatus for producing anti-caking sodium bicarbonate as described in any one of claims 1-3, characterized in that, The fluidized bed body device includes a first fluidized bed section and a second fluidized bed section. The first fluidized bed section is connected to a carbon dioxide storage tank C104 and carbon dioxide gas can be input into it through the carbon dioxide storage tank C104. The lower end of the second fluidized bed section is connected to a heat exchanger refrigerated dryer Y109 to generate cold boiling, and water-cooled heat exchange tubes S114 are laid inside the bed.

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