Spray-dried enzymolysis corn flour and preparation method thereof

Abstract

The invention relates to the technical field of corn processing, in particular to spray-dried enzymolysis corn flour and a preparation method thereof.The preparation method comprises the steps that corn is selected, cleaned and ground, water and an enzyme preparation are added into the corn to be mixed, enzymolysis corn steep liquor is obtained, fresh corn kernels are added after the enzymolysis corn steep liquor is heated at high temperature, and grinding is conducted to obtain corn grinding pulp; spray-drying the corn pulp to obtain corn flour; the humidity of corn flour is detected, and the air inlet temperature of an air disperser in the drying tank is adjusted according to the actual humidity of the corn flour; the humidity uniformity of the corn flour is obtained by detecting the humidity of the corn flour for multiple times, and whether temperature distribution in the drying tank is uniform or not is judged according to the humidity uniformity of the corn flour; and for the condition that the air inlet temperature cannot meet the standard corn flour humidity requirement, the standard corn flour humidity requirement is met by adjusting the air inlet speed or the rotating speed of the centrifugal atomizer. By detecting the humidity of the corn flour, the conditions such as the air inlet temperature and the air inlet speed in the preparation steps are adjusted, and the corn flour meeting the humidity requirement is rapidly produced.

Description

Technical Field

[0001] The invention relates to the technical field of corn processing, and in particular to spray-dried enzymatically hydrolyzed corn flour and a preparation method thereof. Background Art

[0002] Corn is native to Central and South America and is now widely grown in tropical and temperate regions around the world. It has high nutritional value and is an excellent food crop; it is also one of the indispensable raw materials for food, medical and health, light industry, chemical industry, etc. The composition and nutritional value of corn flour are also worthy of attention. Corn flour is rich in nutrients such as lecithin, linoleic acid, cereal alcohol, vitamin E and cellulose, and has multiple health benefits such as lowering blood pressure, lowering blood lipids, and anti-atherosclerosis. It completely retains the nutritional components of corn and improves the shortcomings of coarse grain flour foods, such as poor taste and indigestibility. The moisture content of corn flour directly affects the growth of mold and the accumulation of aflatoxin during its storage. Studies have shown that under different moisture content conditions of corn flour, the growth of Aspergillus flavus and the accumulation of aflatoxin first increase rapidly with the extension of storage time, and then remain basically unchanged. Specifically, when the storage time is the same, the growth of Aspergillus flavus and the accumulation of aflatoxin increase with the increase of corn flour moisture content, and there is a very significant positive correlation between the two. The importance of controlling the moisture content of corn flour lies in preventing mildew and ensuring product quality. Excessive moisture content in corn flour can easily lead to mildew, affect product quality, and even cause potential harm to human health and animal husbandry. The traditional detection method is to use an oven to heat and dry for 4 hours and then weigh it, but this method is time-consuming. Modern enterprises prefer to use halogen rapid moisture meters, which can quickly and accurately detect moisture content within a dozen minutes to meet the needs of rapid production.

[0003] Chinese Patent Publication No.: CN106722065A discloses a method for preparing corn flour, which includes the following steps: pre-crushing, cooking, refining, enzymolysis, filtering, concentrating, homogenizing, sterilizing, spray drying, and packaging. The present invention first pre-crushes the corn kernels, then places them in a cooking tank for pre-cooking, adds sodium tripolyphosphate and sodium citrate, and passes through a colloid mill. Add medium-temperature α-amylase to the enzymolysis tank for enzymolysis, cool down, add cellulase for enzymolysis, and after the enzymolysis is completed, add sodium D-isoascorbate and baking soda, and then filter, concentrate, homogenize, sterilize, and finally spray dry to prepare enzymolysis corn flour. The enzymolysis corn flour prepared by this method completely removes the starch in the corn, significantly improves the taste, and can solve the problem of corn beverage regeneration and agglomeration in the later stage.

[0004] It can be seen that the prior art lacks a method for quickly producing corn flour by detecting the moisture content of corn flour and thereby adjusting conditions such as the inlet air temperature, inlet air speed, and centrifugal atomizer speed in the preparation steps. Summary of the invention

[0005] To this end, the present invention provides a spray-dried enzymatic corn flour and a preparation method thereof, so as to overcome the problem in the prior art that corn flour with stable humidity cannot be quickly produced due to the lack of a method for detecting the humidity of the corn flour and thus adjusting the conditions such as the inlet air temperature, the inlet air speed and the speed of the centrifugal atomizer in the preparation steps.

[0006] To achieve the above object, the present invention provides a method for preparing spray-dried enzymatically hydrolyzed corn flour, comprising the following steps:

[0007] Pre-treating corn to obtain corn flour, detecting the moisture of the corn flour to determine whether to adjust the air inlet temperature, or whether to continue the drying spray operation;

[0008] In the case where the air inlet temperature cannot meet the corn flour humidity requirement, the corn flour humidity is tested multiple times to determine whether the temperature in the drying tank is evenly distributed and to determine the area with uneven temperature distribution in the drying tank according to the areas with different humidity of the corn flour;

[0009] Adjust the air inlet speed according to the area, or the centrifugal atomizer speed to meet the corn flour moisture requirement;

[0010] Among them, the inlet air temperature is the inlet air temperature of the air disperser; and the inlet air speed is the inlet air speed of the air disperser.

[0011] Further, the process of pre-treating corn to obtain corn flour and detecting the moisture of the corn flour to determine whether to adjust the air inlet temperature or continue the drying spray operation includes:

[0012] The corn flour humidity is detected to obtain actual corn flour humidity, and the actual corn flour humidity is compared with a standard corn flour humidity range to obtain a first corn flour humidity comparison result. According to the first corn flour humidity comparison result, it is determined whether to adjust the inlet air temperature.

[0013] Further, the process of determining whether the temperature in the drying tank is evenly distributed by repeatedly detecting the humidity of the corn flour and determining the area of ​​uneven temperature distribution in the drying tank according to the locations of the corn flour with different humidity levels includes:

[0014] Obtain corn flour of preset weight, divide the corn flour of preset weight into several portions according to the order of air outlets to obtain corn flour with to-be-tested humidity, sample the corn flour to-be-tested and test its humidity to obtain the humidity uniformity of corn flour of preset weight, compare the humidity uniformity of corn flour of preset weight with the humidity uniformity of standard corn flour to obtain a first corn flour humidity uniformity comparison result, and determine whether to re-obtain corn flour of preset weight to re-test its humidity uniformity according to the first corn flour humidity uniformity comparison result.

[0015] Further, the process of determining whether the temperature in the drying tank is evenly distributed by repeatedly detecting the humidity of the corn flour and determining the area of ​​uneven temperature distribution in the drying tank according to the locations of the corn flour with different humidity levels includes:

[0016] When the moisture uniformity of the corn flour with the preset weight is greater than the moisture uniformity of the standard corn flour, the inlet air temperature is adjusted according to the difference between the moisture uniformity of the corn flour with the preset weight and the moisture uniformity of the standard corn flour to obtain the first inlet air temperature.

[0017] Further, the process of determining whether the temperature in the drying tank is evenly distributed by repeatedly detecting the humidity of the corn flour and determining the area of ​​uneven temperature distribution in the drying tank according to the locations of the corn flour with different humidity levels includes:

[0018] In the case where the humidity uniformity of corn flour with a preset weight is less than that of standard corn flour, the corn flour with the humidity to be tested is obtained and a humidity test is performed to obtain the interval corn flour humidity. The interval corn flour humidity is compared with the average humidity of the corn flour with the humidity to be tested, and based on the comparison result, it is determined whether to adjust the first air inlet temperature to obtain the second air inlet temperature.

[0019] Further, the process of adjusting the air inlet speed or the centrifugal atomizer speed according to the area to meet the corn flour moisture requirement includes:

[0020] In the case where the second air inlet temperature is adjusted to be equal to the maximum value of the standard air inlet temperature, the actual corn flour humidity is compared with the standard corn flour humidity range again to obtain a second corn flour humidity comparison result, and whether to adjust the air inlet speed is determined according to the second corn flour humidity comparison result;

[0021] Wherein, the maximum value of the standard inlet air temperature is determined according to the rotation speed of the centrifugal atomizer.

[0022] Further, the process of adjusting the air inlet speed or the centrifugal atomizer speed according to the area to meet the corn flour moisture requirement includes:

[0023] When the first corn flour humidity comparison result is that the actual corn flour humidity is greater than the maximum value of the standard corn flour humidity interval, the air intake speed is adjusted according to the difference between the maximum value of the standard corn flour humidity interval and the actual corn flour humidity.

[0024] Further, the process of adjusting the air inlet speed or the centrifugal atomizer speed according to the area to meet the corn flour moisture requirement includes:

[0025] When the first corn flour humidity comparison result is that the actual corn flour humidity is less than the minimum value of the standard corn flour humidity interval, the air intake speed is slowed down or the centrifugal atomizer speed is adjusted according to the difference between the actual corn flour humidity and the minimum value of the standard corn flour humidity interval.

[0026] Further, the process of slowing down the air intake speed or adjusting the rotation speed of the centrifugal atomizer according to the difference between the actual corn flour humidity and the minimum value of the standard corn flour humidity range includes:

[0027] In the case where slowing down the air intake speed causes the moisture uniformity of the preset weight corn flour to be greater than the moisture uniformity of the standard corn flour, the standard corn flour moisture requirement is met by increasing the speed of the centrifugal atomizer; in the case where adjusting the speed of the centrifugal atomizer cannot meet the standard corn flour moisture requirement, check the centrifugal atomizer nozzle to determine whether it is blocked.

[0028] The present invention also provides a spray-dried enzymatically hydrolyzed corn flour, comprising sticky corn flour and fruit corn flour, wherein the weight percentage of the sticky corn flour and the fruit corn flour is 27:45.

[0029] Compared with the prior art, the beneficial effect of the present invention is that, through grinding and enzymolysis reaction, the nutrients in corn can be more fully released and retained, thereby improving the nutritional value of the final corn flour. High temperature enzyme inactivation treatment ensures that the enzyme activity is completely eliminated, avoiding possible quality changes during subsequent storage. The use of a filtering device ensures the purity of corn slurry and reduces the impact of impurities on the final product. Spray drying technology is adopted to enable corn slurry to be dried quickly and evenly, thereby improving production efficiency. By detecting the humidity of corn flour and adjusting the air inlet temperature according to the actual humidity of corn flour, accurate control of the humidity of corn flour is achieved, ensuring that the drying degree of corn flour meets the standard corn flour humidity requirements, avoiding the quality degradation and nutrient loss of corn flour due to excessive drying, or mold and deterioration due to insufficient drying. By detecting the humidity uniformity of corn flour, it is ensured that the humidity of each batch of corn flour is within the standard range, avoiding product quality problems caused by excessive or low humidity. If the temperature distribution in the drying tank is uniform, the corn humidity distribution should be consistent, which can prevent the uneven quality of corn flour finished products due to uneven temperature distribution in the drying tank, affecting product sales. The quality consistency of each batch of corn flour is guaranteed, and the market competitiveness of the product is improved. When the inlet air temperature cannot meet the standard corn flour humidity requirements, compensation can be made by adjusting the inlet air speed or the centrifugal atomizer speed. This adjustment method enhances the adaptability and stability of the production line, can meet the needs under different production conditions, and improve product quality while ensuring the drying speed. By accurately controlling the temperature during the drying process, energy waste is reduced. Enzyme inactivation treatment and precise humidity control can effectively extend the storage period of corn flour and reduce the possible deterioration problems during storage.

[0030] Furthermore, by comparing the actual corn flour humidity with the standard corn flour humidity range, it is possible to quickly determine whether the corn flour humidity meets the requirements. In the case where the actual corn flour humidity is lower than the minimum value of the standard corn flour humidity range, the inlet air temperature is reduced, and the water content of the corn slurry atomized particles in the corn slurry after atomization by the centrifugal atomizer is not much, which is quickly transferred to the bottom of the drying tank by the reduced inlet air temperature. At the same time, the reduction of the inlet air temperature can also make the corn slurry atomized particles over-dry, avoiding the corn flour from affecting the taste and nutritional components due to low humidity. In the case where the actual corn flour humidity is higher than the maximum value of the standard corn flour humidity range, the inlet air temperature is increased, and the excess water content of the corn slurry atomized particles in the corn slurry after atomization by the centrifugal atomizer can be evaporated by high temperature, ensuring that the corn flour is fully dried, avoiding agglomeration or deterioration due to excessive humidity. In the case where the humidity is within the standard range, there is no need to adjust the inlet air temperature, saving energy and maintaining production stability. The inlet air temperature is dynamically adjusted to avoid the problems of over-drying or under-drying that may occur in the traditional fixed temperature drying method. By accurately controlling the inlet air temperature, unnecessary energy consumption is reduced and production costs are reduced. When the actual corn flour moisture meets the standard, there is no need to adjust the inlet air temperature, which further improves energy efficiency. By real-time monitoring of corn flour moisture and adjusting the inlet air temperature, the corn flour moisture is always within the standard range, reducing the defective rate caused by excessively high or low humidity. By dynamically adjusting the inlet air temperature, the equipment is prevented from being in a high or low temperature state for a long time, reducing the wear and aging of the equipment. Reasonable inlet air temperature adjustment reduces the equipment operating load and extends the service life of the spray dryer and centrifugal atomizer. For corn flour from different batches or different raw materials, it can quickly adapt and adjust the drying parameters to ensure stable product quality.

[0031] Furthermore, by detecting the humidity uniformity of corn flour, it is ensured that the humidity of each batch of corn flour is within the standard range, avoiding product quality problems caused by excessively high or low humidity. Controlling the humidity uniformity of corn flour can prevent corn flour from caking, deteriorating or losing nutrients, and improve the taste and nutritional value of the product. By comparing the humidity uniformity of corn flour with the humidity uniformity of standard corn flour, the problem of uneven temperature distribution in the drying tank can be quickly discovered. For areas with higher temperatures in the drying tank, the drying process parameters are optimized by adjusting the inlet air temperature or inlet air speed to ensure uniform drying effects. Through multiple tests and adjustments, the temperature distribution in the drying tank is ensured to be uniform, avoiding production instability caused by temperature fluctuations. By accurately adjusting the inlet air temperature and inlet air speed, unnecessary energy waste is avoided. When the humidity uniformity of corn flour meets the standard, there is no need to repeat the test and adjustment, further reducing energy consumption. For corn flour products with high humidity requirements (such as baby food, health products, etc.), this method can accurately control the humidity uniformity to meet high-precision production requirements.

[0032] Furthermore, by presetting the difference between the humidity uniformity of corn flour by weight and the humidity uniformity of standard corn flour, combined with the influence ratio parameter of the difference between the humidity uniformity of corn flour by weight and the humidity uniformity of standard corn flour on the inlet air temperature, the inlet air temperature can be accurately adjusted to ensure the uniformity of the humidity of corn flour. In the case where the humidity uniformity of corn flour by weight is greater than the humidity uniformity of standard corn flour, the inlet air temperature is dynamically increased to improve the uniformity of temperature distribution in the drying tank and avoid excessive or low local humidity. In the case where the humidity uniformity of corn flour by weight is less than the humidity uniformity of standard corn flour, the inlet air temperature is further increased by obtaining the humidity of corn flour with humidity to be detected and the average humidity of corn flour with humidity to be detected, so that the temperature in the drying tank can be accurately controlled to produce corn flour with humidity that meets the standard.

[0033] By further dividing the air inlet speed into an initial adjustment range, a medium adjustment range, and a high adjustment range, and combining the corresponding impact compensation parameters, the required air inlet speed adjustment amount can be accurately calculated. This method can automatically select the corresponding adjustment range and impact compensation parameters according to different humidity difference ranges, and is suitable for a variety of production scenarios. By dynamically adjusting the air inlet speed, it is possible to quickly respond to changes in corn flour humidity, reduce waiting time in the production process, and improve production efficiency. By accurately adjusting the air inlet speed, it is ensured that the corn flour humidity is always within the standard range, avoiding product quality problems caused by excessively high or low humidity. Dynamically adjust the air inlet speed according to the humidity difference to avoid unnecessary energy waste.

[0034] Furthermore, the above method and specific embodiments achieve accurate and efficient control of corn flour humidity, and have the following comprehensive beneficial effects: improving the accuracy and adaptability of humidity control; optimizing production efficiency and reducing energy consumption; ensuring product quality and reducing operational difficulty. The method is suitable for the humidity regulation needs in corn flour production and other similar processes, and has broad application prospects.

[0035] Furthermore, by determining the centrifugal atomizer speed by using the difference between the humidity uniformity of the preset weight corn flour and the humidity uniformity of the standard corn flour and the compensation parameter for the effect of the difference between the humidity uniformity of the preset weight corn flour and the humidity uniformity of the standard corn flour on increasing the centrifugal atomizer speed, the required air intake speed and the centrifugal atomizer speed adjustment amount can be accurately calculated to avoid excessive or insufficient adjustment. By dynamically adjusting the air intake speed and the centrifugal atomizer speed, it is possible to quickly respond to humidity changes, reduce waiting time in the production process, and improve production efficiency.

[0036] Furthermore, by determining the centrifugal atomizer speed by using the difference between the humidity uniformity of the preset weight corn flour and the humidity uniformity of the standard corn flour and the compensation parameter for the effect of the difference between the humidity uniformity of the preset weight corn flour and the humidity uniformity of the standard corn flour on increasing the centrifugal atomizer speed, the required air intake speed and the centrifugal atomizer speed adjustment amount can be accurately calculated to avoid excessive or insufficient adjustment. By dynamically adjusting the air intake speed and the centrifugal atomizer speed, it is possible to quickly respond to humidity changes, reduce waiting time in the production process, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Flow chart of the method for preparing spray-dried enzymatically hydrolyzed corn flour in this embodiment;

[0038] Figure 2 The process flow chart of detecting the moisture uniformity of corn flour in the method for preparing spray-dried enzymatic corn flour in this embodiment;

[0039] Figure 3 The present invention is a flow chart of the process of adjusting the air inlet temperature in the method for preparing the spray-dried enzymatic corn flour in this embodiment;

[0040] Figure 4 This is a process flow chart of adjusting the air inlet speed in the method for preparing spray-dried enzymatic corn flour in this embodiment. DETAILED DESCRIPTION

[0041] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0043] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0044] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] See also Figure 1-Figure 4 As shown, Figure 1 Flow chart of the method for preparing spray-dried enzymatically hydrolyzed corn flour in this embodiment; Figure 2 The process flow chart of detecting the moisture uniformity of corn flour in the method for preparing spray-dried enzymatic corn flour in this embodiment; Figure 3 The present invention is a flow chart of the process of adjusting the air inlet temperature in the method for preparing the spray-dried enzymatic corn flour in this embodiment; Figure 4 This is a process flow chart of adjusting the air inlet speed in the method for preparing spray-dried enzymatic corn flour in this embodiment.

[0046] This embodiment provides a method for preparing spray-dried enzymatically hydrolyzed corn flour, comprising the following steps:

[0047] Step S1, pre-treating corn to obtain corn flour, detecting the humidity of the corn flour to determine whether to adjust the air inlet temperature, or whether to continue the drying spray operation;

[0048] Step S2, when the air inlet temperature cannot meet the corn flour humidity requirement, the corn flour humidity is detected multiple times to determine whether the temperature in the drying tank is evenly distributed and to determine the area of ​​uneven temperature distribution in the drying tank according to the areas of corn flour with different humidity levels;

[0049] Step S3, adjusting the air inlet speed or the centrifugal atomizer speed according to the area to meet the corn flour humidity requirement;

[0050] Among them, the inlet air temperature is the inlet air temperature of the air disperser; and the inlet air speed is the inlet air speed of the air disperser.

[0051] The corn pretreatment steps include selecting, cleaning and grinding the corn to obtain ultrafine corn flour, adding water to the ultrafine corn flour and mixing to obtain corn slurry; adding enzyme preparation to the corn slurry for enzymolysis reaction at a preset enzymolysis time and temperature to obtain enzymolysis corn slurry, and heating the enzymolysis corn slurry at high temperature to obtain enzyme-inactivated corn slurry; adding fresh corn kernels to the enzyme-inactivated corn slurry for grinding to obtain corn slurry, filtering the corn slurry through a filtering device to obtain corn fine slurry; spraying and drying the corn fine slurry through a spray dryer to obtain corn flour.

[0052] In this embodiment, corn is selected from sticky corn and sweet corn kernels. 270 kg of corn flour and sticky corn are ground and gradually put into 330 kg of water and stirred evenly. 10.5 L of hydrochloric acid is added, and 1 mol / L hydrochloric acid is used to adjust the pH value of corn slurry to 5.5. Enzymes are added for enzymolysis reaction. The ratio of added enzymes is: medium temperature enzyme 1‰, 270 ml and fungal enzyme 3‰, 810 ml. The mixture is heated to 60°C for enzymolysis reaction and maintained for 1 hour. The temperature is heated to 90°C for enzyme inactivation and maintained for 10 minutes. Baking soda is added to adjust the pH of corn slurry to 6.5. 450 kg of fruit corn kernels are added, ground and dried by spraying with powder to obtain corn flour with the taste of fresh corn.

[0053] Since sticky corn kernels have a high starch content and high sweetness after enzymatic hydrolysis, sticky corn kernels are selected. Through grinding and enzymatic hydrolysis, the nutrients in corn can be more fully released and retained, thereby improving the nutritional value of the final corn flour. High-temperature enzyme inactivation treatment ensures that the enzyme activity is completely eliminated, avoiding possible quality changes during subsequent storage. The use of a filter ensures the purity of corn slurry and reduces the impact of impurities on the final product. The use of spray drying technology enables corn slurry to be dried quickly and evenly, improving production efficiency. By detecting the humidity of corn flour and adjusting the inlet air temperature according to the actual humidity of corn flour, the humidity of corn flour is accurately controlled to ensure that the drying degree of corn flour meets the standard corn flour humidity requirements, avoiding the quality degradation and nutrient loss of corn flour due to excessive drying, or mold and deterioration due to insufficient drying. By testing the humidity uniformity of corn flour, it is ensured that the humidity of each batch of corn flour is within the standard range to avoid product quality problems caused by excessive or low humidity. If the temperature distribution in the drying tank is uniform, the moisture distribution of the corn should be consistent, which can prevent the uneven quality of the finished corn flour due to the uneven temperature distribution in the drying tank, which will affect the sales of the product. The quality consistency of each batch of corn flour is guaranteed, and the market competitiveness of the product is improved. When the inlet air temperature cannot meet the standard corn flour humidity requirements, it can be compensated by adjusting the inlet air speed or the speed of the centrifugal atomizer. This adjustment method enhances the adaptability and stability of the production line, can meet the needs under different production conditions, and improve product quality while ensuring the drying speed. By accurately controlling the temperature during the drying process, energy waste is reduced. Enzyme inactivation treatment and precise humidity control can effectively extend the storage period of corn flour and reduce the deterioration problem that may occur during storage.

[0054] Specifically, the process of pre-treating corn to obtain corn flour and detecting the moisture of the corn flour to determine whether to adjust the air inlet temperature or continue the drying spray operation includes:

[0055] The corn flour humidity is detected to obtain actual corn flour humidity, and the actual corn flour humidity is compared with a standard corn flour humidity range to obtain a first corn flour humidity comparison result. According to the first corn flour humidity comparison result, it is determined whether to adjust the inlet air temperature.

[0056] When the first corn flour humidity comparison result shows that the actual corn flour humidity is less than the minimum value of the standard corn flour humidity interval, the inlet air temperature is lowered according to the difference between the minimum value of the standard corn flour humidity interval and the actual corn flour humidity;

[0057] When the first corn flour humidity comparison result shows that the actual corn flour humidity is greater than the maximum value of the standard corn flour humidity interval, the inlet air temperature is increased according to the difference between the actual corn flour humidity and the maximum value of the standard corn flour humidity interval;

[0058] When the first corn flour humidity comparison result shows that the actual corn flour humidity is within the standard corn flour humidity range, the inlet air temperature does not need to be adjusted.

[0059] By comparing the actual corn flour humidity with the standard corn flour humidity range, it is possible to quickly determine whether the corn flour humidity meets the requirements. If the actual corn flour humidity is lower than the minimum value of the standard corn flour humidity range, the inlet air temperature is reduced, and the water content of the corn slurry atomized particles in the corn slurry after atomization by the centrifugal atomizer is quickly transferred to the bottom of the drying tank by the reduced inlet air temperature. At the same time, the reduction in the inlet air temperature can also make the corn slurry atomized particles over-dry, avoiding the corn flour from affecting the taste and nutritional components due to low humidity. If the actual corn flour humidity is higher than the maximum value of the standard corn flour humidity range, the inlet air temperature is increased, and the excess water content of the corn slurry atomized particles in the corn slurry after atomization by the centrifugal atomizer can be evaporated by high temperature, ensuring that the corn flour is fully dried, avoiding agglomeration or deterioration due to excessive humidity. If the humidity is within the standard range, there is no need to adjust the inlet air temperature, saving energy and maintaining production stability. Dynamically adjust the inlet air temperature to avoid the problems of over-drying or under-drying that may occur in the traditional fixed temperature drying method. By accurately controlling the inlet air temperature, unnecessary energy consumption is reduced and production costs are reduced. When the actual corn flour moisture meets the standard, there is no need to adjust the inlet air temperature, which further improves energy efficiency. By real-time monitoring of corn flour moisture and adjusting the inlet air temperature, the corn flour moisture is always within the standard range, reducing the defective rate caused by excessively high or low humidity. By dynamically adjusting the inlet air temperature, the equipment is prevented from being in a high or low temperature state for a long time, reducing the wear and aging of the equipment. Reasonable inlet air temperature adjustment reduces the equipment operating load and extends the service life of the spray dryer and centrifugal atomizer. For corn flour from different batches or different raw materials, it can quickly adapt and adjust the drying parameters to ensure stable product quality.

[0060] Specifically, the process of repeatedly detecting the humidity of corn flour to determine whether the temperature in the drying tank is evenly distributed and determining the area of ​​uneven temperature distribution in the drying tank according to the locations of corn flour with different humidity levels includes:

[0061] Obtain corn flour of preset weight, divide the corn flour of preset weight into several portions according to the order of air outlets to obtain corn flour with to-be-tested humidity, sample the corn flour to-be-tested and test its humidity to obtain the humidity uniformity of corn flour of preset weight, compare the humidity uniformity of corn flour of preset weight with the humidity uniformity of standard corn flour to obtain a first corn flour humidity uniformity comparison result, and determine whether to re-obtain corn flour of preset weight to re-test its humidity uniformity according to the first corn flour humidity uniformity comparison result.

[0062] Specifically, the process of repeatedly detecting the humidity of corn flour to determine whether the temperature in the drying tank is evenly distributed and determining the area of ​​uneven temperature distribution in the drying tank according to the locations of corn flour with different humidity levels includes:

[0063] When the moisture uniformity of the corn flour with the preset weight is greater than the moisture uniformity of the standard corn flour, the inlet air temperature is adjusted according to the difference between the moisture uniformity of the corn flour with the preset weight and the moisture uniformity of the standard corn flour to obtain the first inlet air temperature.

[0064] Specifically, the process of repeatedly detecting the humidity of corn flour to determine whether the temperature in the drying tank is evenly distributed and determining the area of ​​uneven temperature distribution in the drying tank according to the locations of corn flour with different humidity levels includes:

[0065] In the case where the humidity uniformity of corn flour with a preset weight is less than that of standard corn flour, the corn flour with the humidity to be tested is obtained and a humidity test is performed to obtain the interval corn flour humidity. The interval corn flour humidity is compared with the average humidity of the corn flour with the humidity to be tested, and based on the comparison result, it is determined whether to adjust the first air inlet temperature to obtain the second air inlet temperature.

[0066] This embodiment provides a process for detecting the moisture uniformity of corn flour, including:

[0067] Step S61, obtaining corn flour of a preset weight, and obtaining 1000 g of corn flour from the discharge port of the spray dryer;

[0068] Step S62, 1000g corn flour is evenly divided into 5 portions according to the order of air outlets, each portion is 200g and is marked as sample A, sample B, sample C, sample D, and sample E respectively;

[0069] Step S63, sampling the corn flour to be tested and testing the humidity, randomly sampling from each portion of the corn flour to be tested, taking 10 g of each portion, using a humidity detector to test the humidity, and recording the humidity value of each sample, sample A: 8.2%, sample B: 8.5%, sample C: 8.3%, sample D: 8.6%, sample E: 8.4%;

[0070] Step S64, calculating the moisture uniformity of corn flour of preset weight, the average moisture of 5 samples is 8.4%, and the moisture uniformity is 0.2%.

[0071] Compare the moisture uniformity of the preset weight corn flour with the moisture uniformity of the standard corn flour, the moisture uniformity of the standard corn flour is 1.0%, and compare the calculated moisture uniformity of the preset weight corn flour (0.2%) with the moisture uniformity of the standard corn flour (1.0%).

[0072] In the case where the humidity uniformity of the preset weight corn flour is greater than the humidity uniformity of the standard corn flour (for example, 1.5%), the inlet air temperature is adjusted according to the difference between the humidity uniformity of the preset weight corn flour and the humidity uniformity of the standard corn flour and the proportional parameter of the influence of the difference between the humidity uniformity of the preset weight corn flour and the humidity uniformity of the standard corn flour on the inlet air temperature, and the proportional parameter of the influence of the difference between the humidity uniformity of the preset weight corn flour and the humidity uniformity of the standard corn flour on the inlet air temperature is set to 30, and the current inlet air temperature is 150° C., then the adjusted first inlet air temperature is 150+(1.5-1.0)×30=165° C.;

[0073] If the humidity uniformity of the preset weight corn flour is less than the humidity uniformity of the standard corn flour, the first inlet air temperature is adjusted according to the absolute value of the difference between the humidity of the interval corn flour and the average humidity of the corn flour to be detected to obtain the second inlet air temperature.

[0074] Get the humidity interval of the corn flour to be tested, select the humidity of the corn flour to be tested with the largest absolute value of the difference between the average humidity of the corn flour to be tested, which is 8.2%. Compare the humidity of the corn flour in the interval with the average humidity of the corn flour to be tested, which is 8.4%. According to the absolute value of the difference between the average humidity of the corn flour in the interval and the average humidity of the corn flour to be tested, and the absolute value of the difference between the average humidity of the corn flour in the interval and the average humidity of the corn flour to be tested on the first inlet air temperature, the compensation parameter is set to 20, and the second inlet air temperature is determined to be 165+|8.4-8.2|×10=169°C.

[0075] If the moisture uniformity of the preset weight corn flour is equal to the moisture uniformity of the standard corn flour, retesting is not required.

[0076] By testing the humidity uniformity of corn flour, we can ensure that the humidity of each batch of corn flour is within the standard range, avoiding product quality problems caused by excessively high or low humidity. Controlling the humidity uniformity of corn flour can prevent corn flour from caking, deteriorating or losing nutrients, and improve the taste and nutritional value of the product. By comparing the humidity uniformity of corn flour with the humidity uniformity of standard corn flour, we can quickly find the problem of uneven temperature distribution in the drying tank. For the areas with higher temperatures in the drying tank, we can optimize the drying process parameters by adjusting the inlet air temperature or inlet air speed to ensure uniform drying effect. Through multiple tests and adjustments, we can ensure that the temperature distribution in the drying tank is uniform, avoiding production instability caused by temperature fluctuations. By accurately adjusting the inlet air temperature and inlet air speed, we can avoid unnecessary energy waste. When the humidity uniformity of corn flour meets the standard, there is no need to repeat the test and adjustment, which further reduces energy consumption. For corn flour products with high humidity requirements (such as baby food, health products, etc.), this method can accurately control the humidity uniformity to meet high-precision production needs.

[0077] By presetting the difference between the humidity uniformity of corn flour by weight and the humidity uniformity of standard corn flour, combined with the influence ratio parameter of the difference between the humidity uniformity of corn flour by weight and the humidity uniformity of standard corn flour on the inlet air temperature, the inlet air temperature can be accurately adjusted to ensure the uniformity of the humidity of corn flour. In the case where the humidity uniformity of corn flour by weight is greater than the humidity uniformity of standard corn flour, the inlet air temperature is dynamically increased to improve the uniformity of temperature distribution in the drying tank and avoid excessive or low local humidity. In the case where the humidity uniformity of corn flour by weight is less than the humidity uniformity of standard corn flour, the inlet air temperature is further increased by obtaining the humidity of corn flour with humidity to be tested and the average humidity of corn flour with humidity to be tested, so that the temperature in the drying tank can be accurately controlled to produce corn flour with humidity that meets the standard.

[0078] Specifically, the process of adjusting the air inlet speed or the centrifugal atomizer speed according to the area to meet the corn flour moisture requirement includes:

[0079] In the case where the second air inlet temperature is adjusted to be equal to the maximum value of the standard air inlet temperature, the actual corn flour humidity is compared with the standard corn flour humidity range again to obtain a second corn flour humidity comparison result, and whether to adjust the air inlet speed is determined according to the second corn flour humidity comparison result;

[0080] Wherein, the maximum value of the standard inlet air temperature is determined according to the rotation speed of the centrifugal atomizer.

[0081] Specifically, the process of adjusting the air inlet speed or the centrifugal atomizer speed according to the area to meet the corn flour moisture requirement includes:

[0082] When the first corn flour humidity comparison result is that the actual corn flour humidity is greater than the maximum value of the standard corn flour humidity interval, the air intake speed is adjusted according to the difference between the maximum value of the standard corn flour humidity interval and the actual corn flour humidity.

[0083] For the case where the first corn flour humidity comparison result is that the actual corn flour humidity is greater than the maximum value of the standard corn flour humidity range, the corresponding air inlet speed adjustment range is selected according to the difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity.

[0084] When the first corn flour humidity comparison result shows that the actual corn flour humidity is within the standard corn flour humidity range, there is no need to adjust the air inlet speed.

[0085] The adjustment range is divided into an initial adjustment range, a medium adjustment range and a high adjustment range;

[0086] The difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity is the difference in the initial adjustment difference of the air inlet speed, and the air inlet speed is determined according to the compensation parameter of the difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity and the influence of the difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity on the initial adjustment range;

[0087] The difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity is adjusted at the medium difference amplitude of the air inlet speed, and the air inlet speed is determined according to the compensation parameter of the difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity and the influence of the difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity on the medium adjustment amplitude;

[0088] The difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity is adjusted at the high air inlet speed, and the air inlet speed is determined according to the compensation parameters of the difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity and the influence of the difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity on the high adjustment range;

[0089] For example, the maximum value of the standard corn flour humidity range is set to 14%, and the initial value of the air inlet speed is 10m / s.

[0090] Initial adjustment difference range ≤ 2%, 2% ≤ medium adjustment difference range ≤ 5%, high adjustment difference range > 5%, Specific embodiments

[0092] Case 1: Initial adjustment difference amplitude,

[0093] Conditions: Maximum value of standard corn flour humidity range = 14%; Actual corn flour humidity = 15%;

[0094] Humidity difference = 1%;

[0095] Current forward wind speed: V0 = 10m / s;

[0096] Compensation parameter for the effect of the difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity on the initial adjustment range = 0.5;

[0097] After adjustment, the air inlet speed is 10+0.5×1=10.5m / s.

[0098] Case 2: Medium adjustment difference amplitude,

[0099] Conditions: Maximum value of standard corn flour humidity range = 14%; Actual corn flour humidity = 17%;

[0100] Humidity difference = 3%;

[0101] Current forward wind speed: V0 = 10m / s;

[0102] Compensation parameter for the effect of the difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity on the initial adjustment range = 1.0;

[0103] After adjustment, the air inlet speed is 10+1×3=13m / s.

[0104] Case 3: Advanced Adjustment Difference Amplitude,

[0105] Conditions: Maximum value of standard corn flour humidity range = 14%; Actual corn flour humidity = 20%;

[0106] Humidity difference = 6%;

[0107] Current forward wind speed: V0 = 10m / s;

[0108] Compensation parameter for the effect of the difference between the maximum value of the standard corn flour humidity range and the actual corn flour humidity on the initial adjustment range = 1.5;

[0109] After adjustment, the air inlet speed is 10+1.5×6=19m / s.

[0110] By dividing the air inlet speed into initial adjustment range, medium adjustment range and high adjustment range, and combining the corresponding impact compensation parameters, the required air inlet speed adjustment amount can be accurately calculated. This method can automatically select the corresponding adjustment range and compensation parameters according to different humidity difference ranges, and is suitable for a variety of production scenarios. By dynamically adjusting the air inlet speed, it can quickly respond to changes in corn flour humidity, reduce waiting time in the production process, and improve production efficiency. By accurately adjusting the air inlet speed, it is ensured that the humidity of corn flour is always within the standard range, avoiding product quality problems caused by excessively high or low humidity. Dynamically adjust the air inlet speed according to the humidity difference to avoid unnecessary energy waste.

[0111] Specifically, the process of adjusting the air inlet speed or the centrifugal atomizer speed according to the area to meet the corn flour moisture requirement includes:

[0112] When the first corn flour humidity comparison result is that the actual corn flour humidity is less than the minimum value of the standard corn flour humidity interval, the air intake speed is slowed down or the centrifugal atomizer speed is adjusted according to the difference between the actual corn flour humidity and the minimum value of the standard corn flour humidity interval.

[0113] The air inlet speed is slowed down according to the compensation parameter of the difference between the actual corn flour humidity and the minimum value of the standard corn flour humidity interval and the influence of the difference between the actual corn flour humidity and the minimum value of the standard corn flour humidity interval on the air inlet speed;

[0114] For example: Set the minimum value of the standard corn flour humidity range to 12%; actual corn flour humidity = 10% Hactual; current air inlet speed = 10m / s; the compensation parameter for the difference between the actual corn flour humidity and the minimum value of the standard corn flour humidity range on the air inlet speed is 0.5.

[0115] After adjustment, the air inlet speed is 10-0.5×2=9m / s.

[0116] The above method and specific embodiments achieve accurate and efficient control of corn flour humidity, and have the following comprehensive beneficial effects: improving the accuracy and adaptability of humidity control; optimizing production efficiency and reducing energy consumption; ensuring product quality and reducing operational difficulty. The method is suitable for the humidity regulation needs in corn flour production and other similar processes, and has broad application prospects.

[0117] Specifically, the process of slowing down the air intake speed or adjusting the speed of the centrifugal atomizer according to the difference between the actual corn flour humidity and the minimum value of the standard corn flour humidity range includes:

[0118] In the case where slowing down the air intake speed causes the moisture uniformity of the preset weight corn flour to be greater than the moisture uniformity of the standard corn flour, the standard corn flour moisture requirement is met by increasing the speed of the centrifugal atomizer; in the case where adjusting the speed of the centrifugal atomizer cannot meet the standard corn flour moisture requirement, check the centrifugal atomizer nozzle to determine whether it is blocked.

[0119] In case the injection port of the centrifugal atomizer is clogged, the staff will clean it.

[0120] Increase the speed of the centrifugal atomizer and strengthen the atomization intensity, thereby increasing the dispersion of the corn slurry atomized particles, increasing their residence time in the drying tank, and reducing the uniformity of corn flour moisture.

[0121] The centrifugal atomizer speed is determined according to the compensation parameters of the difference between the moisture uniformity of the preset weight corn flour and the moisture uniformity of the standard corn flour and the influence of the difference between the moisture uniformity of the preset weight corn flour and the moisture uniformity of the standard corn flour on increasing the centrifugal atomizer speed.

[0122] For example, the initial centrifugal atomizer speed is 10000 rpm, and the compensation parameter for the effect of the difference between the moisture uniformity of the preset weight corn flour and the moisture uniformity of the standard corn flour on increasing the centrifugal atomizer speed is set to 500.

[0123] The centrifugal atomizer speed is determined by the difference between the humidity uniformity of the preset weight corn flour and the humidity uniformity of the standard corn flour and the compensation parameter of the difference between the humidity uniformity of the preset weight corn flour and the humidity uniformity of the standard corn flour on increasing the centrifugal atomizer speed, and the required air inlet speed and the centrifugal atomizer speed adjustment amount can be accurately calculated to avoid excessive or insufficient adjustment. By dynamically adjusting the air inlet speed and the centrifugal atomizer speed, it can quickly respond to humidity changes, reduce waiting time in the production process, and improve production efficiency.

[0124] This embodiment also provides a spray-dried enzymatic corn flour, including sticky corn flour and fruit corn flour, and the weight percentage of the sticky corn flour and the fruit corn flour is 27:45.

[0125] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0126] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing spray-dried enzymatically hydrolyzed corn flour, characterized in that: The following steps are included: Pre-treating corn to obtain corn flour, detecting the moisture of the corn flour to determine whether to adjust the air inlet temperature, or whether to continue the drying spray operation; In the case where the air inlet temperature cannot meet the corn flour humidity requirement, the corn flour humidity is tested multiple times to determine whether the temperature in the drying tank is evenly distributed and to determine the area with uneven temperature distribution in the drying tank according to the areas with different humidity of the corn flour; Adjust the air inlet speed according to the area, or the centrifugal atomizer speed to meet the corn flour moisture requirement; Among them, the inlet air temperature is the inlet air temperature of the air disperser; and the inlet air speed is the inlet air speed of the air disperser.

2. The method for preparing the spray-dried enzymolysis corn flour according to claim 1, characterized in that: The process of pre-treating corn to obtain corn flour and detecting the moisture of the corn flour to determine whether to adjust the air inlet temperature or continue the drying spray operation includes: The corn flour humidity is detected to obtain actual corn flour humidity, and the actual corn flour humidity is compared with a standard corn flour humidity range to obtain a first corn flour humidity comparison result. According to the first corn flour humidity comparison result, it is determined whether to adjust the inlet air temperature.

3. The method for preparing the spray-dried enzymolysis corn flour according to claim 2, characterized in that: The process of repeatedly detecting the humidity of corn flour to determine whether the temperature in the drying tank is evenly distributed and determining the area of ​​uneven temperature distribution in the drying tank according to the locations of corn flour with different humidity levels includes: Obtain corn flour of a preset weight, divide the corn flour of the preset weight into several portions according to the order of air outlets to obtain corn flour with to-be-tested humidity, sample the corn flour to-be-tested and test its humidity to obtain the humidity uniformity of corn flour of a preset weight, compare the humidity uniformity of corn flour of the preset weight with the humidity uniformity of standard corn flour to obtain a first corn flour humidity uniformity comparison result, and determine whether to re-obtain corn flour of a preset weight to re-test its humidity uniformity based on the first corn flour humidity uniformity comparison result.

4. The method for preparing the spray-dried enzymatically hydrolyzed corn flour according to claim 3, characterized in that: The process of repeatedly detecting the humidity of corn flour to determine whether the temperature in the drying tank is evenly distributed and determining the area of ​​uneven temperature distribution in the drying tank according to the locations of corn flour with different humidity levels includes: When the moisture uniformity of the corn flour with the preset weight is greater than the moisture uniformity of the standard corn flour, the inlet air temperature is adjusted according to the difference between the moisture uniformity of the corn flour with the preset weight and the moisture uniformity of the standard corn flour to obtain the first inlet air temperature.

5. The method for preparing the spray-dried enzymolysis corn flour according to claim 4, characterized in that: The process of repeatedly detecting the humidity of corn flour to determine whether the temperature in the drying tank is evenly distributed and determining the area of ​​uneven temperature distribution in the drying tank according to the locations of corn flour with different humidity levels includes: In the case where the humidity uniformity of corn flour with a preset weight is less than that of standard corn flour, the corn flour with the humidity to be tested is obtained and a humidity test is performed to obtain the interval corn flour humidity. The interval corn flour humidity is compared with the average humidity of the corn flour with the humidity to be tested, and based on the comparison result, it is determined whether to adjust the first air inlet temperature to obtain the second air inlet temperature.

6. The method for preparing the spray-dried enzymolysis corn flour according to claim 5, characterized in that: The process of adjusting the air inlet speed according to the area, or the centrifugal atomizer speed to meet the corn flour moisture requirement includes: In the case where the second air inlet temperature is adjusted to be equal to the maximum value of the standard air inlet temperature, the actual corn flour humidity is compared with the standard corn flour humidity range again to obtain a second corn flour humidity comparison result, and whether to adjust the air inlet speed is determined according to the second corn flour humidity comparison result; Wherein, the maximum value of the standard inlet air temperature is determined according to the rotation speed of the centrifugal atomizer.

7. The method for preparing the spray-dried enzymatically hydrolyzed corn flour according to claim 6, characterized in that: The process of adjusting the air inlet speed according to the area, or the centrifugal atomizer speed to meet the corn flour moisture requirement includes: When the first corn flour humidity comparison result is that the actual corn flour humidity is greater than the maximum value of the standard corn flour humidity interval, the air intake speed is adjusted according to the difference between the maximum value of the standard corn flour humidity interval and the actual corn flour humidity.

8. The method for preparing the spray-dried enzymolysis corn flour according to claim 7, characterized in that: The process of adjusting the air inlet speed according to the area, or the centrifugal atomizer speed to meet the corn flour moisture requirement includes: When the first corn flour humidity comparison result is that the actual corn flour humidity is less than the minimum value of the standard corn flour humidity interval, the air intake speed is slowed down or the centrifugal atomizer speed is adjusted according to the difference between the actual corn flour humidity and the minimum value of the standard corn flour humidity interval.

9. The method for preparing the spray-dried enzymolysis corn flour according to claim 8, characterized in that: The process of slowing down the air intake speed or adjusting the speed of the centrifugal atomizer according to the difference between the actual corn flour humidity and the minimum value of the standard corn flour humidity range includes: In the case where slowing down the air intake speed causes the moisture uniformity of the preset weight corn flour to be greater than the moisture uniformity of the standard corn flour, the standard corn flour moisture requirement is met by increasing the speed of the centrifugal atomizer; in the case where adjusting the speed of the centrifugal atomizer cannot meet the standard corn flour moisture requirement, check the centrifugal atomizer nozzle to determine whether it is blocked.

10. A spray-dried enzymolyzed corn flour produced by the method for preparing the spray-dried enzymolyzed corn flour according to any one of claims 1 to 9, characterized in that: It comprises sticky corn flour and fruit corn flour, wherein the weight percentage of the sticky corn flour and the fruit corn flour is 27:45.

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