System and method for drying treatment of spent grains

Abstract

The present invention relates to a system and method for the drying treatment of spent grains. The method comprises: mechanically press-filtering raw spent grains provided in batches by means of solid-liquid separation; dehydrating the spent grains by means of removing moisture and gases that affect the clumping rate thereof; and screening the heated and dehydrated high-fiber spent grains and organic-matter-enriched spent grains by means of differential separation and on the basis of protein content, so as to obtain an oversize product for pyrolysis and an undersize product for feed. The system contains a mechanical module for mechanical pressure filtration and dehydration, a first detection module for detecting relevant parameters characterizing the clumping rate, a drying module for heating the spent grains, and a screening module for screening the spent grains.

Description

A dry distiller's grains treatment system and method TECHNICAL FIELD

[0001] The present application relates to the field of brewing, in particular to a dry distiller's grains treatment system and method. BACKGROUND

[0002] Dry distiller's grains is a solid by-product of solid-state liquor brewing. In actual production, the output ratio of liquor to dry distiller's grains is 1:3-4, that is, 3-4 tons of dry distiller's grains are produced for every ton of liquor. The untreated dry distiller's grains has the characteristics of large output, large residual amount of organic acid ester, high acidity, easy moldiness, and high moisture, and therefore, the dry distiller's grains needs to be treated before being discharged or pyrolyzed to reduce the pollution to soil, water, and air.

[0003] The dry distiller's grains treatment device used in the prior art generally directly feeds the dry distiller's grains into a feeder, heats by a hot air machine, and dries in a drying chamber. The inventors found that the direct dry pyrolysis has the following problems:

[0004] The dry distiller's grains with high water content has a particle size of 1-6 mm and is sticky and easy to form a ball, and direct heating and dehydration often causes the surface to be dry and the inside to be wet due to the temperature;

[0005] The dry distiller's grains contains rich protein components, and the pyrolysis process produces sulfides and nitrogen oxides, and the treatment cost of the pyrolysis tail gas is high.

[0006] Further, the inventors explored the energy consumption of dry distiller's grains treatment by a single heating method, and explored the combination of multiple heating methods in the case of single heating. Taking mechanical dehydration and heating dehydration as examples, the inventors explored the action law of mechanical dehydration and heating dehydration on dry distiller's grains, and the results showed that:

[0007] With the decrease of water content, the energy consumption of mechanical dehydration increases exponentially. When the water content of dry distiller's grains decreases from 60% to 35%-40%, mechanical dehydration has a significant low energy consumption and simple process and is easy to handle, but even if the mechanical action intensity is significantly increased, it is still difficult to reduce the water content of dry distiller's grains to below 25%. The decrease of water content of dry distiller's grains and the increase of energy consumption under heating dehydration are positively correlated, and the slope of the curve is low, which is approximately a straight line. Heating dehydration can reduce the water content of dry distiller's grains to below 10%, and the inventors found that, when the target of pyrolysis is dry distiller's grains with a water content of below 10%, the combination of heating dehydration and mechanical dehydration can effectively reduce the energy consumption of the dehydration and drying process.

[0008] Meanwhile, the inventors found that even if the same process and preset processing parameters were used, the residual amount of discarded distiller's grains in the equipment, the sieve obtained after screening for pyrolysis still generated high energy consumption during pyrolysis, and the crude protein content of the undersize obtained by separation was quite different. After long-term observation, the inventors found that the agglomeration rate of discarded distiller's grains of different batches before dehydration treatment was a key factor in the dehydration and screening process, and by differentiating the feeding time and processing process of discarded distiller's grains with different agglomeration rates due to composition and environmental influences in mechanical pressure filtration and heating dehydration, the dehydration energy consumption was reduced, the crude protein content of the undersize was increased, and the dispersion degree of the oversize (for improving pyrolysis efficiency) was improved. SUMMARY

[0009] One of the objects of the present application is to provide a processing method and system for reducing the dehydration energy consumption of discarded distiller's grains.

[0010] One of the objects of the present application is to provide a processing method and system for improving the quality of discarded distiller's grains as feed or feed additive.

[0011] One of the objects of the present application is to provide a processing method and system for reducing waste gas pollution during pyrolysis of discarded distiller's grains.

[0012] One of the objects of the present application is to provide a processing method and system for reducing the particle size of discarded distiller's grains.

[0013] One of the objects of the present application is to provide a processing method and system for reducing the risk of agglomeration during the dehydration process of discarded distiller's grains.

[0014] One of the objects of the present application is to provide a processing method and system for reducing the agglomeration rate of discarded distiller's grains during the dehydration process.

[0015] One of the objects of the present application is to provide a processing method and system for reducing the energy consumption during pyrolysis of discarded distiller's grains.

[0016] The prior art has appeared technical solutions for dehydration treatment of discarded distiller's grains by heating. For example, CN116809611A discloses a recycling method for white spirit distiller's grains. However, in this technical solution, only the heating dehydration method is involved, and the decrease in water content of the discarded distiller's grains under heating dehydration and the increase in energy consumption are positively correlated, which means that a large amount of energy needs to be consumed during the dehydration process, resulting in increased costs. Traditional heating dehydration methods, such as the Tian Guo Zeng, have problems such as high labor intensity, unstable cooling effect, and low heat exchange efficiency, resulting in low production efficiency.

[0017] According to an aspect of the present application, the present application relates to a processing method and system for reducing energy consumption in dewatering of distiller's grains, in particular a drying method for distiller's grains, comprising the following steps: pretreating the distiller's grains to remove surface moisture; gradually reducing the moisture content of the distiller's grains using at least one stage, preferably two stages, or more preferably multiple stages of drying system. Here, the drying temperature and humidity are precisely controlled to optimize energy consumption and dewatering efficiency. Here, when the provided distiller's grains have a first water content, the working temperature of the dewatering equipment (paddle type) is set to a first temperature, and the dewatering is carried out at the first temperature in the dewatering equipment (paddle type) until a second water content is reached, and then the temperature is increased from the first temperature until the distiller's grains reach a third water content; if the third water content is not reached before the combustion critical point, the dewatering is carried out at a temperature before the combustion critical point until the third water content is reached. Here, when setting the working temperature of the dewatering equipment (paddle type) to a first temperature according to the water content of the pretreated distiller's grains, the related parameters characterizing the agglomeration rate are also considered, in particular the organic matter content determined according to the standard sample (first parameter), the ratio of agglomerated mass to total sample mass (second parameter) and the equivalent pressure value during stirring (third parameter).

[0018] According to an aspect of the present application, the present application relates to a processing method and system for reducing waste gas pollution during pyrolysis of distiller's grains, comprising the following steps: adding adsorbents to capture harmful gases during pyrolysis; using a multi-stage filtration system to remove particulate matter and harmful substances.

[0019] According to an aspect of the present application, the present application relates to a processing method and system for reducing the risk of agglomeration during dewatering of distiller's grains, comprising the following steps: using stirring drying technology to maintain uniform distribution of distiller's grains; using a vibrating sieve separation device to further prevent agglomeration.

[0020] According to an aspect of the present application, the present application relates to a processing method and system for reducing energy consumption during pyrolysis of distiller's grains, comprising the following steps: pre-drying the distiller's grains by mechanical pressure filtration before pyrolysis to reduce the initial moisture content; using a high-efficiency pyrolysis furnace to optimize heat energy utilization; using an intelligent control system to precisely adjust the pyrolysis temperature and time to improve energy efficiency.

[0021] The above aspects can be used in combination or in parallel with each other, as long as there is no contradiction between them.

[0022] Preferably or additionally, the present application further relates to a distiller's grains drying method, which can comprise the following steps: S1, batch-providing original distiller's grains in a solid-liquid separation manner by mechanical pressure filtration, wherein the original distiller's grains with a first water content and the original distiller's grains with a second water content are provided in a manner related to the relevant parameters for characterizing the agglomeration rate, and the first water content is different from the second water content, wherein the first water content is greater than the second water content; S2, dehydrating the distiller's grains in a manner of removing water and gas affecting the agglomeration rate, wherein S2.1, for the distiller's grains filtered to the first water content, constant-temperature dehydration is performed on the distiller's grains with the first water content at a first temperature corresponding to the relevant parameters for characterizing the agglomeration rate until the second water content is reached, and then the distiller's grains dehydrated to the second water content are subjected to temperature-increasing dehydration, or S2.2, for the distiller's grains filtered to the second water content, temperature-increasing dehydration is performed on the distiller's grains with the second water content, wherein the temperature-increasing dehydration starts to increase the temperature at the first temperature corresponding to the relevant parameters for characterizing the agglomeration rate in time until a second temperature lower than the critical point of the distiller's grains combustion is reached and the second temperature is maintained until the distiller's grains reach a third water content; S3, screening the dehydrated high-fiber distiller's grains and the organic matter-enriched distiller's grains separated in a manner of differential separation based on the protein content, to obtain a screen-over material for pyrolysis and a screen-under material for feed.

[0023] Preferably, when at least one parameter of the batch-provided original distiller's grains for characterizing the agglomeration rate exceeds or is equal to a preset first threshold of the relevant parameters for characterizing the agglomeration rate, the original distiller's grains with the relevant parameter exceeding or being equal to the preset first threshold are filtered to the first water content; and when at least one parameter of the original distiller's grains for characterizing the agglomeration rate is lower than a preset first threshold of the relevant parameters for characterizing the agglomeration rate, the original distiller's grains with the relevant parameter lower than the preset first threshold are filtered to the second water content.

[0024] In the present application, the original distiller's grains refer to the distiller's grains remaining after the completion of brewing and no longer used for fermentation.

[0025] Unlike the prior art, the present application can simultaneously use mechanical dehydration and heating dehydration to dehydrate the distiller's grains, wherein the corresponding dehydration manner is set according to the different agglomeration rates of the distiller's grains, and the different dehydration manners can constitute an associated processing flow. Based on the above-mentioned distinguishing technical features, the problems to be solved by the present application can include: how to reduce the energy consumption of distiller's grains drying. Specifically, mechanical dehydration can pre-removes part of the water in the distiller's grains, reducing the energy consumption and time of subsequent heating dehydration. For example: by pre-removing water through mechanical dehydration, the heat required in the heating dehydration process can be reduced, thereby reducing the overall energy consumption.

[0026] Preferably, the mechanical pressure filtration comprises the following steps: mechanically pressure filtering the original distiller's grains with a water content of 57% to 62% in a solid-liquid separation manner, a pressure filtration pressure of 0.8 to 1.2 MPa, reducing the water content of the distiller's grains to 35% to 40%, discarding the filtrate, and collecting the distiller's grains. The dehydration treatment of the distiller's grains comprises the following steps: dehydrating the distiller's grains in a manner of removing water and gases affecting the pelletization rate in the distiller's grains until the water content of the distiller's grains is reduced to 8% to 10%. The distiller's grains with a water content of 8% to 10% are screened in a manner of differential separation based on protein content, and the oversize and undersize are obtained for pyrolysis and organic matter enrichment, respectively.

[0027] More preferably, the original distiller's grains with a water content of 57.6% are mechanically pressure filtered in a solid-liquid separation manner, the pressure filtration pressure is 1.2 MPa, the water content of the distiller's grains is reduced to 35.9%, the filtrate is discarded, and the distiller's grains are collected. The distiller's grains are dehydrated under the treatment condition of heating at 180℃ for 15 min, and the water content of the distiller's grains is reduced to 8.1%. The distiller's grains with a water content of 8.1% are screened through an 80-mesh screen, and the oversize and undersize with crude protein not less than 7% are obtained for pyrolysis.

[0028] The beneficial effects of the technical solution are as follows:

[0029] 1. The inventors explored the pyrolysis of distiller's grains with a water content of up to 65%, and determined a low-energy-consumption and high-efficiency drying system by combining various dehydration methods. The system can also solve the problems of uneven pyrolysis and gas pollution.

[0030] Based on the energy consumption control experiment provided in Example 1, it can be known that using a mechanical method to treat high-water-content (about 60%) distiller's grains and using a heating method to treat low-water-content (35% to 40%) distiller's grains can significantly reduce the energy consumption. Therefore, the inventors set a water content standard for determining the transition from mechanical dehydration to heating dehydration, so as to ensure that the energy consumption of the mechanical dehydration combined with the heating dehydration is not only significantly reduced compared with a single drying treatment technology, but also lower than the energy consumption of the drying treatment in other water content intervals.

[0031] At the same time, based on the operation influence of distiller's grains dehydration, the applicant considers that the existing technology involves various dehydration equipment, and based on the dehydration effect and energy consumption analysis of mechanical dehydration and heating dehydration, it is found that the combination of mechanical dehydration and heating dehydration can effectively reduce the energy consumption of the dehydration drying process (Example 1, FIG. 1) by reducing the water content of the distiller's grains to below 10% for pyrolysis. Therefore, from the energy consumption efficiency or large-scale application scenario, the mechanical dehydration combined with the heating dehydration is a better choice for the distiller's grains dehydration operation.

[0032] 2、The relevant research results show that the content of crude fiber in the solid after drying of spent grains is more than 30%, and the crude fiber component mainly comes from the rice husk component added during fermentation. This part can produce pyrolysis gas through pyrolysis, and after combustion, it can provide energy for production. However, the content of crude protein in the solid after drying of spent grains is more than 7% (see examples 2-5), and direct pyrolysis will cause more sulfides and nitrogen oxides during pyrolysis and combustion. Therefore, the current spent grain treatment must be treated by spraying, desulfurization and denitrification treatment, etc. to meet the discharge standards.

[0033] The problems of prolonging the treatment time and the need for secondary purification of the treatment product during the treatment of spent grains increase the cost of spent grain treatment.

[0034] Considering that the direct pyrolysis treatment of spent grains will produce a high content of sulfides and nitrogen oxides due to the high protein content, the spent grain treatment process of the present application sets a screening link to screen out the components with high crude fiber and low protein content (oversize) from the spent grains for subsequent pyrolysis, and the part with high protein and low fiber (undersize) can be used in other fields. The present application screens the dehydrated and dried spent grains, and the upper layer of the screened spent grains mainly contains crude fiber components, which have very low protein content. Burning this part of the spent grains for production provides energy, and the tail gas treatment is easier, the pollutants are less, and the cost is lower.

[0035] 3、In the process of combining the two dehydration methods, the inventors found that due to the influence of the state of different batches of spent grains, the dispersion degree of the oversize produced by the linear mechanical pressure filtration-warming pressure filtration setting process is unstable, and the oversize produced by part of the treated spent grains still has the problem of low-efficiency pyrolysis. At the same time, the organic matter content (in this application, crude protein is taken as an example) of the undersize produced by the oversize is large, which makes it impossible to control the quality of the treated spent grains when they are used as pyrolysis materials and feed additives. The viscosity of the spent grains with high agglomeration rate is large, and after pressure compression, it is not only difficult to be stirred uniformly by stirring equipment, but also may further increase the agglomeration rate of the spent grains during the process of reducing water content. At the same time, the spent grains with high agglomeration rate are more likely to form spent grain groups with diameters exceeding a certain range, which cannot be dispersed. Such spent grain groups will form solid blocks with soft inside and dry outside during the dehydration process (which cannot be dispersed by simple shearing and stirring), increasing the difficulty of screening.

[0036] Compared with the spent grain treatment process in the prior art, the present application proposes a differentiated treatment process based on the requirements of the physical state of the spent grains in actual application, and related supporting equipment is also proposed.

[0037] The application makes the Doucha with high agglomeration rate retain more moisture in mechanical filter pressing. On the one hand, the presence of water can help soften the Doucha during the heating process, making it easier to break up and thus improving the efficiency of stirring the Doucha. On the other hand, the high heat capacity of water can provide more uniform heat conduction for the Doucha during the heating process, avoiding the situation of uneven dehydration inside and outside the Doucha caused by local overheating.

[0038] Another aspect of the application relates to a Doucha drying treatment system. The Doucha drying treatment system comprises a mechanical module for mechanical filter pressing dewatering of raw Doucha. The mechanical module preferably includes a double-screw filter press, a servo hydraulic system, an online viscometer, a pre-crushing blade set, a filter cloth self-cleaning device. The Doucha drying treatment system comprises a first detection module for detecting at least one parameter of the raw Doucha for characterizing the agglomeration rate. The first detection module preferably includes a rotary viscometer, a laser particle size analyzer, a near-infrared moisture meter to obtain the viscosity, moisture content, particle distribution and other agglomeration rate characterization parameters of the Doucha. The Doucha drying treatment system comprises a drying module for constant temperature heating or temperature increasing heating of the Doucha. The drying module preferably includes a paddle dryer, a hot air circulation system, a centrifugal crusher, a dew point sensor. The Doucha drying treatment system comprises a screening module for screening the dried Doucha. The screening module can separate high-fiber Doucha (overs) from organic matter-enriched Doucha (unders) based on differences in protein content. The screening module preferably includes a multi-layer vibrating screen, a pneumatic conveying system, a photoelectric sorter, an ultra-fine particle pulverizer.

[0039] According to a preferred embodiment, the specific operation process of the Doucha drying treatment system is as follows: the first detection module detects the agglomeration rate parameters of the raw Doucha, and the mechanical module performs filter pressing on the raw Doucha in batches according to the measured agglomeration rate parameters. Further, the drying module performs constant temperature heating or temperature increasing heating on the Doucha treated by the mechanical module to obtain the dried Doucha. The dried Doucha is then separated by the screening module to obtain the target material. The screening module preferably dynamically adjusts the mesh size and the separation threshold according to the protein content detection results of the Doucha.

[0040] Preferably, a high-temperature-resistant screw conveyor is used to connect the mechanical module and the drying module.

[0041] Preferably, a buffer hopper is provided between the drying module and the screening module.

[0042] According to a preferred embodiment, the Doucha drying treatment system is configured such that the mechanical module mechanically filter presses the batch-provided raw Doucha in a solid-liquid separation manner. When the at least one parameter of the raw Doucha detected by the first detection module for characterizing the agglomeration rate exceeds or equals a preset first threshold of the related parameter for characterizing the agglomeration rate, the mechanical module filter presses the raw Doucha with the related parameter exceeding or equal to the preset first threshold to a first moisture content.

[0043] Specifically, the first detection module transmits the agglomeration rate parameter to the mechanical module in real time to control the target moisture content of the filter pressing. The drying module automatically selects the constant temperature or temperature increasing mode according to the moisture content data output by the mechanical module. The dried distillers' grains are transported to the screening module, and the screening module sorts the distillers' grains based on the protein content of the distillers' grains.

[0044] According to a preferred embodiment, the distillers' grains drying treatment system is configured such that, when at least one parameter of the raw distillers' grains detected by the first detection module for characterizing the agglomeration rate is lower than a preset first threshold of the relevant parameter for characterizing the agglomeration rate, the mechanical module presses the raw distillers' grains with the relevant parameter lower than the preset first threshold to a second moisture content, wherein the first moisture content is greater than the second moisture content.

[0045] According to a preferred embodiment, the distillers' grains drying treatment system is configured such that the drying module dehydrates the distillers' grains in a manner of removing water and gases affecting the agglomeration rate in the distillers' grains, wherein, for the distillers' grains pressed to the first moisture content, the drying module dehydrates the distillers' grains at the first moisture content at a first temperature corresponding to the relevant parameter for characterizing the agglomeration rate until the second moisture content is reached, and then dehydrates the distillers' grains at the second moisture content at a constant temperature to the second moisture content; or, for the distillers' grains pressed to the second moisture content, the drying module dehydrates the distillers' grains at the second moisture content at the first temperature corresponding to the relevant parameter for characterizing the agglomeration rate.

[0046] According to a preferred embodiment, the distillers' grains drying treatment system is configured such that the screening module screens the high-fiber distillers' grains and the organic matter-rich distillers' grains separated after the temperature dehydration in a manner of differential separation based on the protein content, to obtain the oversize for pyrolysis and the undersize for feed.

[0047] The beneficial effects of the technical solution are as follows:

[0048] The present application adjusts the pressure adjustment process in the filter pressing process, and differentiates the pressure filtration treatment of distillers' grains with different agglomeration rates, so that the distillers' grains can enter the dehydration process based on transpiration with different moisture contents, and the distillers' grains with high agglomeration rate can retain more water and have higher flow conductivity. During the stirring process, the distillers' grains with high agglomeration rate are more easily dispersed due to the influence of high moisture content.

[0049] The agglomeration rate not only affects the filtration and drying process, but also directly affects the quality of the final product. For products as feed additives, the degree of agglomeration affects the appearance, and excessive agglomeration may result in poor product appearance, thereby reducing the market acceptance of the product. The present application significantly improves the quality of the distillers' grains as feed after dehydration treatment. As shown in Examples 2-5, the distillers' grains drying treatment method proposed by the present application can obtain organic matter aggregation particles with crude protein content of more than 7% without coarse fibers.

[0050] According to a preferred embodiment, the second detection module for detecting the moisture content of the original loss of grain collects the moisture content b of the original loss of grain and transmits it to the control unit, wherein the control unit calculates the first moisture content M1 through formula (1): M1 = b - k1 x (A1 - a) (1),

[0051] b represents the moisture content of the original loss of grain; k1 represents a constant; A1 represents a related parameter exceeding or equal to a preset first threshold a; and a represents the first threshold.

[0052] According to a preferred embodiment, in the processing step S1, the first moisture content M1 can be calculated through formula (1).

[0053] According to a preferred embodiment, the second detection module for detecting the moisture content of the original loss of grain collects the moisture content b of the original loss of grain and transmits it to the control unit, wherein the control unit calculates the second moisture content M2 through formula (2): M2 = b - k2 x (a - A2) (2),

[0054] b represents the moisture content of the original loss of grain; k2 represents a constant; A2 represents a related parameter lower than a preset first threshold a; and a represents the first threshold.

[0055] According to a preferred embodiment, in the processing step S1, the second moisture content M2 can be calculated through formula (2).

[0056] The beneficial effects of the technical solution are as follows:

[0057] The present application introduces the relationship between the briquetting rate and the preset threshold value, so that the operator can dynamically adjust the specific value of the moisture content based on the formula, realize the purpose of accurately controlling the moisture content of the loss of grain, and meet the quality control of the loss of grain in different batches under different application purposes or different factory states.

[0058] k1 in formula (1) and k2 in formula (2) both represent a constant, which is used to optimize the calculation of the moisture content. The workers can confirm the constant value suitable for them through different processing process requirements or according to relevant experimental data.

[0059] The preset first threshold a is set by the human according to the experience table. The moisture content is an important factor affecting the briquetting rate of the original loss of grain, and different batches of original loss of grain will also produce different briquetting rates due to the influence of factors such as pits, fermentation seasons, and raw materials. Based on this, the value of a in formula (1) and formula (2) can be set by experience table.

[0060] According to a preferred embodiment, in the S1 step, the mechanical module for mechanically filtering and dewatering the raw manure exerts a squeezing action on the raw manure according to the applied pressure, and expels part of the liquid containing free water and capillary water through the pores of the solid matter in a manner that retains the solid matter in the raw manure and transfers the solid matter to the drying module for removing water in the solid particles and affecting the agglomeration rate. The manure lumps caused by the aggregated proteins in the solid matter with free water as the medium are reduced by the above-mentioned filter pressing method. Preferably, the solid matter contains proteins, plant fibers, microbial residues, and microbial metabolic residues.

[0061] The beneficial effects of the technical solution are:

[0062] Although simple squeezing, especially squeezing with continuously increasing pressure, can retain the solid matter in the raw manure, it also forces part of the gas to increase the solubility in the liquid, and even forms lumps and locks a large amount of bubbles and water in a large number of lumps. Therefore, in the process of mechanically filtering and dewatering the raw manure, the pressure is applied in a fluctuating manner, especially in a fluctuating manner of high pressure followed by low pressure, and the mechanical module is prompted to dislocate the high squeezing pressure points in time, so as to further reduce the aggregated protein lumps with free water as the medium, thereby eliminating the formation process of lumps containing water bubbles or gas bubbles.

[0063] The water locked in the lumps exists in the form of free water, capillary water, and bound water, respectively.

[0064] The liquid in the form of free water is, for example, a liquid that does not form strong interactions with solute molecules.

[0065] The liquid in the form of capillary water is, for example, a liquid that is bound in small pores or fibers inside the material by capillary action. Due to the influence of capillary action (i.e., surface tension and adhesion), the liquid in the form of capillary water needs to overcome the force formed between it and the solid matter to be expelled, so even if the pressure is increased, part of the liquid in the form of capillary water that forms a larger force with the solid matter will still remain in the solid matter.

[0066] Since the solid matter in the manure contains a large amount of fibers, when the liquid and the solid are separated, the liquid in the form of free water remaining in the lumps of the solid will be preferentially separated out. Considering that the energy consumption of mechanical filter pressing is much lower than that of heating filter pressing, by mechanical filter pressing, the liquid in the form of free water in the manure is preferentially squeezed out through the pores in the solid matter (especially the lumps formed by the solid matter), and at the same time, part of the liquid in the form of capillary water is also squeezed out during the application of pressure.

[0067] The distiller's grains contain a high proportion of water (usually between 60% and 80%) and also contain unfermented starch, protein, cellulose, fat and microbial cells, etc. As the water content in the distiller's grains gradually decreases, the difference in the clumping rate gradually increases, and the unfermented starch, protein, cellulose, etc. contained therein also form a water-absorbing network and become a factor hindering the dewatering of the distiller's grains. At the same time, as the water is lost, the part of the distiller's grains that has coagulated into clumps or blocks gradually becomes compact and cannot be easily broken up (as the water is removed, the distance between the solid particles in the clumps or blocks of the distiller's grains decreases, and the unfermented starch, protein, cellulose, etc. come into closer contact with each other; the removal of water reduces the lubricating effect between the particles, and the friction and binding forces between the solid particles increase; some chemical changes that increase the compactness of the distiller's grains, such as denaturation of the protein and gelatinization of the starch, can also occur during the dewatering process).

[0068] The different forms of combination between the solids and the liquids in the distiller's grains have a significant impact on the clumping rate of the distiller's grains and on reducing the clumping rate of the distiller's grains. The liquid in the form of free water can be removed by simple mechanical pressure filtration. When the pressure of the mechanical pressure filtration is increased, i.e. the external extrusion effect is enhanced, part of the liquid in the form of capillary water can also be removed after overcoming the force formed between it and the solid matter. The removal of the above-mentioned liquid can reduce the aggregation between the solid matter containing protein in the distiller's grains, thereby reducing the clumping rate of the distiller's grains. For example: the reduction of the content of the liquid in the form of free water can reduce the intermediate substances that support the aggregation between the proteins, so that a larger amount of protein is dispersed in the form of monomers in the distiller's grains. Unlike the effect of reticulated protein on the distiller's grains, the presence of monomeric protein has a lower degree of influence on the clumping of the distiller's grains, and also makes the distiller's grains that become filter cake due to the extrusion effect of external force more easily broken up during the stirring process.

[0069] According to a preferred embodiment, the drying module provides heat to the distiller's grains that are transported from the mechanical module after pressure filtration and are in the first water content or the second water content due to the presence of capillary water and bound water therein, and dewatering processes the distiller's grains in the first water content by removing the capillary water and bound water distributed in the solid matter in the distiller's grains in a manner that reduces the clumping rate of the distiller's grains.

[0070] The beneficial effects of the technical solution are as follows:

[0071] Under the traditional processing method, due to a large number of bubbles and moisture being locked in the large lumps, even higher temperatures than the critical value of combustion cannot cause the lumps to release the moisture and gas therein, and even the hydration reaction related to protein modification may be formed instead. Therefore, according to the present application, the spent grains at the first water content after the pressure filtration process are subjected to high-speed stirring before they are heated to the first temperature, in particular, the stirring speed during feeding is faster than the stirring speed during the final-stage heating and dewatering, that is, before feeding, the stirring speed of the drying module is set to a higher stirring speed to mechanically disperse the lumps with a large number of bubbles and moisture locked therein in a manner of mutual collision during the feeding stage, so as to avoid the half-cylinder effect caused by the lumps under the action of gravity, that is, the high-moisture lumps under pressure will accumulate at the lower part and continue to accumulate in the lower half of the stirring interval at high temperatures, together forming a "shell" of spent grains facing the stirring mechanism, which forms a thermal insulation layer and causes a large amount of invalid energy consumption. According to the present application, the "spent grains transferred after pressure filtration" are at the first water content or the second water content due to the influence of capillary water and bound water therein, and the feeding speed or the feeding speed change rate is pre-set according to both the stirring speed and the water content (first or second).

[0072] At the same time, during the heating process, a large amount of liquid in the form of bound water in the lumps will also be in contact with the high-temperature environment before and including the first temperature based on the shearing action generated by stirring, thereby improving the utilization efficiency of the high-temperature environment. The liquid in the form of bound water, for example, is a liquid that forms strong interactions with solute molecules, ions, or other components. Such a liquid is tightly bound to the solute through hydrogen bonds, ion-dipole interactions, or other chemical bonds, and this binding often changes the physical and chemical properties of water. For example: in spent grains, the liquid can form hydrogen bonds with the polar groups on the surface of the proteins (one of the solid substances) in the spent grains, becoming bound water. The present application destroys the chemical bonds formed between the liquid in the form of bound water and the proteins in the spent grains based on the way of heating and dewatering to improve the environmental temperature, and based on the energy accumulation, the liquid evaporates, thereby causing the aggregated proteins to be distributed in the form of free amino acids or monomer proteins in the spent grains. The free water as an intermediate medium connects multiple monomer proteins through chemical bonds, forming aggregated proteins. After being connected between the free water and the proteins, the free water is converted into bound water. The aggregated proteins are mostly in a network form, increasing the viscosity of the spent grains and increasing the agglomeration rate of the spent grains.

[0073] The present technical solution provides high-temperature conditions to affect the solubility, viscoelasticity of proteins and increase the possibility of aggregated proteins in the form of large particles (rather than a network) through protein deformation and chemical bond destruction, so that as much as possible of the undersize in the screening process can retain crude protein rather than in the form of free polypeptides or amino acids attached to the surface of the fibers on the oversize.

[0074] According to a preferred embodiment, the mechanical module updates the preset first threshold value of the parameter used to represent the lumping rate of the batch of raw distiller's grains according to the process parameter affecting the lumping rate of each batch of raw distiller's grains, and then performs mechanical pressure filtration on the batch of raw distiller's grains based on the updated preset first threshold value.

[0075] Preferably, the process parameter affecting the lumping rate includes but is not limited to pit type, moisture content of raw distiller's grains, distiller's grains production time (which can be accurate to days), application type of Daqu, raw material of brewing fermented grains, and pH value of raw distiller's grains. The specific operation of adjusting the first threshold value according to the process parameter can be referred to the embodiments.

[0076] The beneficial effects of the technical solution are:

[0077] 1. Each batch of distiller's grains is set with relevant parameters separately for the distiller's grains produced at different times, and these parameters are recorded in a manner related to the corresponding pit number, thereby forming relevant parameters used to represent the lumping rate, which are related to the quality of the distiller's grains, and these parameters are also beneficial to indicate the fermentation degree in reverse. These parameters stored in a manner related to the corresponding pit number can be used to improve the setting of feeding time and pit starting time after continuous production for many years.

[0078] 2. By collecting and analyzing the process parameter data related to the lumping rate, a more accurate data model can be established, and the manual intervention in setting the first threshold value for different batches of distiller's grains is reduced. With the process parameter affecting the lumping rate as the independent variable, the selection of the first threshold value of the parameter used to represent the lumping rate in each batch is more targeted, making the setting of the first threshold value more closely related to the lumping rate it represents, so that the dynamic adjustment of the process parameter can not only reduce the lumping rate of the distiller's grains during processing, but also maintain the consistency and stability of the quality (such as crude protein content) of the distiller's grains after processing.

[0079] According to a preferred embodiment, the parameter used to represent the lumping rate includes a second parameter calculated from the mass of the lumped part and the total sample mass, and the second parameter is calculated by formula (3):

[0080] The beneficial effects of the technical solution are:

[0081] Using the mass of the lumped part and the total sample mass as the evaluation parameter reduces the difficulty of obtaining the parameter used to represent the lumping rate, making the technical solution more suitable for factory or workshop operation. Compared with the complex chemical analysis method, the parameters obtained by visual observation, image acquisition or screening and weighing reduce the complexity of obtaining the second parameter and increase the measurement efficiency of the second parameter.

[0082] According to a preferred embodiment, the parameter related to the agglomeration rate in the processing step S1 can be the organic matter content. The first detection module is configured as a device for detecting the organic matter content. The first threshold value can be set as a numerical value of the organic matter content. Preferably, the first threshold value is set between 5% and 50% by mass. More preferably, the first threshold value is set as 20% by mass.

[0083] According to a preferred embodiment, the at least one parameter for characterizing the agglomeration rate is set as a first parameter representing the organic matter content, wherein, when the first parameter exceeds or equals a preset first threshold value, the mechanical module for mechanically filter-pressing the raw spent grains for dewatering filter-presses the raw spent grains with the first parameter exceeding or equal to the preset first threshold value to a first water content calculated by the control unit according to formula (1); when the first parameter is lower than the preset first threshold value, the mechanical module filter-presses the raw spent grains with the first parameter lower than the preset first threshold value to a second water content calculated by the control unit according to formula (2).

[0084] Preferably, the first detection module is configured to detect the organic matter content of the raw spent grains, wherein, when the first detection module detects that the organic matter content exceeds or equals a preset first threshold value of the organic matter content, the mechanical module filter-presses the raw spent grains with the organic matter content exceeding or equal to the preset first threshold value of the organic matter content to a first water content calculated by the control unit according to formula (1); when the first detection module detects that the organic matter content is lower than the preset first threshold value of the organic matter content, the mechanical module filter-presses the raw spent grains with the organic matter content lower than the preset first threshold value of the organic matter content to a second water content calculated by the control unit according to formula (2).

[0085] The beneficial effects of the technical solution are as follows:

[0086] The influencing factors of the agglomeration rate of the spent grains include:

[0087] (1) Water content: Higher water content usually increases the stickiness and agglomeration tendency of the spent grains, and reducing the water content helps to reduce the number of agglomerated spent grains.

[0088] (2) Organic matter content: Protein polymerization forms a network of high molecular structure, which may affect the stickiness of the spent grains and thus affect the agglomeration rate. In addition, high temperature may cause protein modification, making the spent grains more viscous and further affecting the agglomeration rate.

[0089] (3) Pressure in the mechanical filter-pressing process: The continuous pressure applied by the filter-pressing type dewatering device to the spent grains can cause the agglomeration rate of the spent grains to increase.

[0090] Considering that the proportion of free water will decrease due to the loss of water during the dehydration process, the content of organic matter continuously existing in the lost grain can increase the stability of the evaluation results as a relevant parameter for evaluating the agglomeration rate of the lost grain. At the same time, since the detection accuracy of the content of organic matter is high (requires the use of high-precision instruments for measurement), the accuracy of the agglomeration rate represented thereby is also high.

[0091] According to a preferred embodiment, in the processing step S1, the relevant parameter for representing the agglomeration rate can be a third parameter represented by a pressure value. Preferably, the first detection module is arranged as a stirring pressure rod, and the pressure value (i.e. the third parameter) displayed by the stirring pressure rod during the stirring of the lost grain represents the agglomeration rate of the lost grain. Preferably, the first threshold value can be set as a pressure parameter. Preferably, the first threshold value is set between 50-70 mPa·s. More preferably, the first threshold value is set to 60 mPa·s.

[0092] According to a preferred embodiment, in the processing step S2, the dehydration treatment comprises the following steps: taking the reduction of the moisture content of the lost grain to a third moisture content that can be used as dry feed as the judgment basis for stopping the dehydration treatment, and performing the dehydration treatment of the lost grain compressed to the first moisture content or the lost grain compressed to the second moisture content to the second moisture content to the first moisture content by increasing the temperature from the first temperature to the preset maximum temperature value. According to the processing method described in embodiments 2-5, the lost grain with a moisture content of less than 20% after the final dehydration can participate in the screening, and the undersize material with a crude protein content of not less than 7% can be obtained.

[0093] In the processing step S1, the at least one parameter representing the agglomeration rate provided in batches by mechanical compression filtration with gradient change of pressure exceeds or is equal to the preset first threshold value of the relevant parameter for representing the agglomeration rate of the original lost grain.

[0094] The beneficial effects of the technical solution are:

[0095] Unlike the prior art, the present application can evaluate the agglomeration rate of the original lost grain according to the relevant parameters detected by the first detection module, and dynamically adjust the compression filtration parameters of the filter press based on the detection results. Based on the above-mentioned distinguishing technical features, the problems to be solved by the present application can include: how to reduce the probability of agglomeration or blocking of the lost grain during the compression filtration dehydration process. Specifically, in the traditional compression filtration dehydration process, since the agglomeration rate of the lost grain will gradually increase as the moisture content of the lost grain decreases, this greatly increases the possibility of agglomeration or blocking of the lost grain during the compression filtration process. If uniform compression filtration parameters are used to process lost grains with different agglomeration rates, the lost grain with a higher agglomeration rate will be more likely to agglomerate or block. Such agglomeration or blocking not only affects the subsequent drying effect, but also can cause the lost grain feed after drying to have a blocky or clumpy structure with improved solidity and hardness, thereby affecting the quality and applicability of the lost grain feed as feed.

[0096] Compared with the gradual pressure filtration, the stage pressure filtration can also reduce energy consumption and reduce the wear of the pressure filtration machine. The gradual pressure filtration needs to continuously overcome the flow resistance of the lost grain to increase the pressure during the pressure filtration process, while the stage pressure filtration keeps the pressure constant in each stage. Therefore, the equipment in the stage pressure filtration does not need to be in the state of increasing and varying pressure for a long time, which also reduces the wear and energy consumption of the equipment.

[0097] According to a preferred embodiment, in the processing step S1, the original lost grain provided in batches and characterized by the low agglomeration rate is subjected to the mechanical pressure filtration in the solid-liquid separation mode based on the gradually increasing pressure provided, and at least one parameter for characterizing the agglomeration rate is lower than a preset first threshold value of the related parameter for characterizing the agglomeration rate.

[0098] The beneficial effects of the technical solution are as follows:

[0099] Considering that the risk of the lost grain with a low agglomeration rate increasing in the agglomeration rate after the moisture decreases is relatively low, the gradual pressure filtration program is adopted. In the gradual pressure filtration process, the pressure gradually increases, which helps to more uniformly drain the moisture in the lost grain. However, due to the gradual increase in pressure, the structure of the lost grain in the form of filter cake after pressure filtration may be more uniform, and the density may be higher. Therefore, for the lost grain with a relatively low agglomeration rate, considering that the lost grain with agglomeration or clumping generated in the mechanical pressure filtration process is easy to be dispersed in the drying module or the stirrer to increase the drainage efficiency of the lost grain and reduce the energy consumption, the pressure filter is set to the gradual pressure filtration program.

[0100] According to a preferred embodiment, in the processing step S3, the crude protein content in the lost grain rich in organic matter is not less than 7%. As can be seen from Examples 2-5, the crude protein content of the undersize obtained by the processing method provided in Examples 2-5 is not less than 7%.

[0101] According to a preferred embodiment, the first moisture content range is 40%-50%. Preferably, the first moisture content is 50%, 45% or 40%.

[0102] According to a preferred embodiment, the second moisture content range is 30%-40%. Preferably, the second moisture content is 30%, 40% or 35%.

[0103] Preferably, the mechanical module is a plate-and-frame filter press. The specific operation steps of the mechanical module for mechanically pressure filtering the original lost grain provided in batches in the solid-liquid separation mode are, for example, that the plate-and-frame filter press is used to pressure filter the lost grain with a moisture content of 57%-62% at a pressure of 0.8-1.2 MPa, so that the moisture content of the lost grain is reduced to 35%-40%, the filtrate is discarded, and the lost grain filter cake is collected.

[0104] Preferably, the drying module comprises a paddle dryer. The specific operation steps of the drying module for dewatering the spent grains in a manner of removing the moisture and the gas affecting the clumping rate are, for example: the spent grain filter cake is transferred into the paddle dryer, and is heated and dewatered until the moisture content of the spent grains is reduced to 8% to 10%; the spent grains with the moisture content reduced to 8% to 10% are screened to obtain the sieve residue for pyrolysis and the sieve underfall rich in organic matter.

[0105] More preferably, the plate-and-frame filter press is used to filter press the spent grains with the moisture content of 57.6%, the filter press pressure is set to 1.2 MPa, and the filter pressing is performed until the moisture content of the spent grains reaches 35.9%; the filtrate is discarded, and the spent grain filter cake is collected. The filtered spent grains are transferred into the paddle dryer, heated at 180℃ for 15 min, and dewatered until the moisture content of the spent grains reaches 8.1%. The spent grains with the moisture content reduced to 8.1% are screened by the screening module.

[0106] According to a preferred embodiment, the dewatering temperature of the drying module ranges from 100 to 200℃. Preferably, the dewatering temperature of the drying module is 100℃, 110℃, 120℃, 130℃, 140℃, 150℃, 160℃, 170℃, 180℃, 190℃, or 200℃.

[0107] According to a preferred embodiment, the screen mesh aperture for screening ranges from 60 to 80 meshes. Preferably, the screen mesh aperture is 60 meshes. Preferably, the screen mesh aperture is 70 meshes. Preferably, the screen mesh aperture is 80 meshes.

[0108] According to a preferred embodiment, the filter press pressure ranges from 1 to 1.2 MPa. Preferably, the filter press pressure is 1 MPa. Preferably, the filter press pressure is 1.1 MPa. Preferably, the filter press pressure is 1.2 MPa.

[0109] According to a preferred embodiment, the heating temperature of the paddle dryer ranges from 160 to 200℃. Preferably, the heating temperature of the paddle dryer is 160℃. Preferably, the heating temperature of the paddle dryer is 180℃. Preferably, the heating temperature of the paddle dryer is 200℃.

[0110] According to a preferred embodiment, the heating time of the paddle dryer ranges from 10 to 15 min. Preferably, the heating time of the paddle dryer is 10 min. Preferably, the heating time of the paddle dryer is 15 min.

[0111] Preferably, the first time length is less than the second time length. For example, the first time length is 15 min, and the second time length can be 20 min.

[0112] Preferably, the first pressure value is selected from 0.1-0.5 Mpa. More preferably, the first pressure value is 0.1 Mpa. The first pressure value is 0.2 Mpa. The first pressure value is 0.3 Mpa. The first pressure value is 0.4 Mpa. The first pressure value is 0.5 Mpa.

[0113] Preferably, the second pressure value is selected from 0.5-1.0 Mpa. More preferably, the second pressure value is 0.5 Mpa. The second pressure value is 0.6 Mpa. The second pressure value is 0.7 Mpa. The second pressure value is 0.8 Mpa. The second pressure value is 0.9 Mpa. The second pressure value is 1.0 Mpa.

[0114] Preferably, the third pressure value is selected from 0.5-1.5 Mpa. More preferably, the third pressure value is 0.8 Mpa. The third pressure value is 1.0 Mpa. BRIEF DESCRIPTION OF DRAWINGS

[0115] Figure 1 is a statistical diagram of energy consumption provided by the present application;

[0116] Figure 2 is a process flow diagram of S1 step provided by the present application;

[0117] Figure 3 is a process flow diagram of S2 step provided by the present application. DETAILED DESCRIPTION

[0118] The following will be described in detail with reference to the accompanying drawings.

[0119] In the description of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance. The meaning of "several" is two or more, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0120] The agglomeration rate is a method for characterizing the performance of viscous distiller's grains (such as fermented distiller's grains) during processing. The agglomeration rate generally refers to the degree of formation of lumps by distiller's grains under certain conditions. For viscous distiller's grains, the determination and control of the agglomeration rate is very important. Agglomeration can affect the efficiency of solid-liquid separation, filtration speed and product quality. The agglomeration rate refers to the proportion of lumps formed between distiller's grains particles during processing due to viscosity or other reasons. The agglomeration rate can be expressed by determining the proportion of the agglomeration part in a unit volume or mass of distiller's grains, for example, the agglomeration rate can be calculated by the following formula:

[0121] The agglomeration rate can be measured by the following method:

[0122] 1. Sieving method: a series of standard sieving is used to separate the agglomeration part and the non-agglomeration part by passing the sampled part through sieves of different particle sizes.

[0123] 2. Manual separation method: The sampled sample is manually separated into agglomerated and non-agglomerated parts, and the agglomerated rate is calculated by weighing.

[0124] 3. Visual recognition method or image analysis method: The proportion of the agglomerated part is roughly estimated by visual observation or by image analysis.

[0125] Example 1

[0126] The mechanical method is used when treating high-moisture-content (about 60%) distiller's grains, and the heating method is used when treating low-moisture-content (35%-40%) distiller's grains.

[0127] A paddle dryer (KJG-300, heat transfer area 300 m 2 ) and a plate-and-frame filter press (specification model XAMG80 / 1000-30U, filtration pressure 0.6-1.2 MPa, filtration area 80 m 2 , filter plate size 1000 mm*1000 mm) are taken as examples.

[0128] The power consumption of the plate-and-frame filter press for reducing the moisture content of 70% distiller's grains to 40% is 50 K at a pressure of 1.0 MPa. The power consumption of the paddle dryer for reducing the moisture content of 70% distiller's grains to 40% is 80 K at a heating temperature of 160°C. Based on the calculation of power consumption, the power consumption of the three methods for reducing 70% distiller's grains to 20% distiller's grains is calculated in this embodiment.

[0129] As shown in FIG. 1, in the process of gradually reducing the moisture content of distiller's grains (especially after 40%), the energy consumption of the mechanical drying method directly increases from 50 K (moisture content 40%) to 400 K (moisture content 20%), the energy consumption of the heating drying method directly increases from 80 K (moisture content 40%) to 150 K (moisture content 20%), and the energy consumption of the combined mechanical and heating drying method increases from 50 K (moisture content 40%) to 100 K (moisture content 20%).

[0130] The results show that:

[0131] When mechanical dehydration is used, the energy consumption increases approximately exponentially as the moisture content decreases. Mechanical dehydration has a significantly low energy consumption when reducing the moisture content of distiller's grains from about 60% to 35%-40%, but even if the mechanical action intensity is significantly increased, it is still difficult to reduce the moisture content of distiller's grains to below 25% (A line).

[0132] When heating dehydration is used, the decrease of the moisture content and the increase of the energy consumption are positively correlated, and the slope of the curve is low, approximately a straight line. Although heating dehydration can reduce the moisture content of distiller's grains to below 10%, the energy consumption required for heating dehydration gradually increases as the moisture content of distiller's grains decreases (B line).

[0133] When mechanical dewatering and heating dewatering are used in combination, i.e. the mechanical method is used when treating high water content (40% to 60%) distiller's grains, and the heating method is used when treating low water content (35% to 40%) distiller's grains, the energy consumption is significantly reduced (C line).

[0134] Currently, distiller's grains after drying and deacidification treatment are mainly used as feed additives. In recent years, pyrolysis has been used to convert high-moisture distiller's grains into steam and other energy sources required in the brewing process, which has become a research hotspot due to its rapid, clean, and large-scale treatment characteristics. Many studies have shown that the required heat will increase from 70 kilocalories per kilogram to 2400 kilocalories per kilogram when the water content of solid waste decreases from 80% to 30%. According to relevant reports, when chain stoves are used to treat distiller's grains generated during wine brewing, the high-moisture waste cannot be completely pyrolyzed and combusted in the furnace. The above results can indicate that the water content of solid waste has a significant impact on its pyrolysis.

[0135] Example 2

[0136] This example provides a specific embodiment of distiller's grains treatment without using mechanical pressure filtration.

[0137] The steps of distiller's grains treatment include:

[0138] (1) Collecting solid-state method distiller's grains, and measuring the water content of 57.6%;

[0139] (2) Sending the distiller's grains into a paddle dryer, and maintaining the working temperature of the paddle dryer at 180°C for 28 minutes, so that the water content of the distiller's grains is reduced to 9.8%;

[0140] (3) Screening the dried distiller's grains in (2) through an 80-mesh sieve, collecting the sieve residue, and measuring the protein content of 7.0%.

[0141] Example 3

[0142] This example provides a specific embodiment of distiller's grains treatment, which is inconsistent with the above example in that this example does not include screening the dried distiller's grains.

[0143] (1) Collecting solid-state method distiller's grains, and measuring the water content of 57.6%;

[0144] (2) Using a plate-and-frame filter press to filter the distiller's grains, discarding the filtrate, collecting the distiller's grains filter cake, and measuring the water content of 35.9%;

[0145] (3) Sending the distiller's grains filter cake into a paddle dryer, and maintaining the working temperature of the paddle dryer at 180°C for 15 minutes, so that the water content of the distiller's grains is reduced to 8.5%, and the protein content is measured to be 17.6%.

[0146] Embodiment 4

[0147] The embodiment provides a specific implementation of a discarded bran treatment, which is inconsistent with the above embodiment, and the treatment method of the embodiment optimizes treatment parameters.

[0148] (1) Collect the solid-state method of liquor discarded bran, and measure that the water content is 61.8%;

[0149] (2) The plate and frame filter press is used for pressure filtration of the discarded bran, the equipment pressure is 1 MPa, the filtrate is discarded, the discarded bran filter cake is collected, and the water content is measured to be 36.8%;

[0150] (3) The discarded bran filter cake is sent into the paddle dryer, the working temperature of the paddle dryer is 160 DEG C, is kept for 15 min, the water content of the discarded bran is reduced to 9.8%, and the protein content is measured to be 16.8%;

[0151] (4) The discarded bran after drying in (3) is screened, is passed through a 60-mesh sieve, the sieve upper matter is collected, and the protein content is measured to be 7.2%.

[0152] Embodiment 5

[0153] The embodiment provides a specific implementation of a discarded bran treatment, which is inconsistent with the above embodiment, and the treatment method of the embodiment optimizes treatment parameters.

[0154] (1) Collect the solid-state method of liquor discarded bran, and measure that the water content is 61.8%;

[0155] (2) The plate and frame filter press is used for pressure filtration of the discarded bran, the equipment pressure is 1 MPa, the filtrate is discarded, the discarded bran filter cake is collected, and the water content is measured to be 36.8%;

[0156] (3) The discarded bran filter cake is sent into the paddle dryer, the working temperature of the paddle dryer is 180 DEG C, is kept for 12 min, the water content of the discarded bran is reduced to 9.5%, and the protein content is measured to be 16.8%;

[0157] (4) The discarded bran after drying in (3) is screened, is passed through a 60-mesh sieve, the sieve upper matter is collected, and the protein content is measured to be 7.1%.

[0158] Embodiment 6

[0159] The application relates to a drying process and system for discarded bran with obvious particle aggregation. Repetitive contents of the foregoing embodiments are omitted. The following technical features are applicable to the foregoing embodiments, and vice versa, as long as there is no contradiction.

[0160] The steps of S1 comprise:

[0161] S1-1 confirms the first threshold value a and the constant k1 of the current batch of samples based on an empirical table, and measures the water content b of the raw dregs;

[0162] S1-2 determines at least three sampling points of the raw dregs, weighs the total mass of the raw dregs of the determined range of sampling points and the mass of the screened clumped part, and obtains the parameter A1 of the raw dregs based on the following formula:

[0163] S1-3 obtains the first water content M1 based on the following formula (1): M1=b-k1×(A1-a) (1),

[0164] b represents the water content of the raw dregs; k1 represents a constant; A1 represents a parameter exceeding or equal to the preset first threshold value;

[0165] a represents the first threshold value;

[0166] S1-4, when the parameter A1 of the raw dregs provided in batches for characterizing the clumping rate exceeds or is equal to the preset first threshold value a of the relevant parameter for characterizing the clumping rate, mechanically filters the raw dregs with the parameter A1 exceeding or being equal to the preset first threshold value a in a solid-liquid separation manner to the first water content M1.

[0167] According to a preferred embodiment, the raw dregs with the parameter A1 exceeding or being equal to the preset first threshold value of the relevant parameter for characterizing the clumping rate provided in batches and characterizing the clumping rate are mechanically filtered in a gradient pressure change manner.

[0168] According to a preferred embodiment, the step of mechanically filtering the raw dregs with the parameter A1 exceeding or being equal to the preset first threshold value a comprises: S1-4-1, a pulse pre-pressing filtration stage; S1-4-2, a main press filtration stage; S1-4-3, a high-pressure filtration stage; and S1-4-4, a pulse high-pressure filtration stage.

[0169] Preferably, S1-4-1, the pulse pre-pressing filtration stage: the mechanical module provides initial filtration for the dregs in the mechanical module at a set first pressure value.

[0170] The purpose of the pre-pressing filtration stage is to preliminarily discharge free water in the dregs and form a preliminary filter cake structure. The dregs are uniformly distributed on the filter cloth (or filter frame) through the press filtration under a low pressure state.

[0171] Preferably, as shown in Table 1 and Fig. 2, the S1-4-2 main pressure filtration stage: the mechanical module filters the distiller's grains in the mechanical module at a set second pressure value. More preferably, the main pressure filtration stage includes a high-pressure stage with different pressure and pressure filtration time. For example: the S1-4-2-1 mechanical module filters the distiller's grains in the mechanical module at a set second pressure value in the first stage for a preset first time length; the S1-4-2-2 mechanical module filters the distiller's grains in the mechanical module at a set second pressure value in the second stage for a preset second time length. The second pressure value in the first stage is greater than the second pressure value in the second stage. For example: 1.0 Mpa continuous filtration, switch to 0.5 Mpa after 5 min, switch to 1.0 Mpa continuous filtration after 5 min, switch to 0.5 Mpa after 5 min, and the above filtration process is repeated for 3 times.

[0172] Preferably, the S1-4-4 pulse high-pressure filtration stage: the mechanical module applies pressure to the distiller's grains in the mechanical module at least once for a short time at a set third pressure value, until the moisture content of the distiller's grains in the mechanical module is less than the first moisture content.

[0173] The distiller's grains drying system further comprises a control unit provided with an input end and having computing capability. The control unit is configured to confirm the first threshold value a and the constant k1 based on an experience table input by the input end of the control unit or a selection instruction for the experience table pre-stored in the control unit.

[0174] The control unit is configured to calculate the parameter A1 representing the agglomeration rate of the current batch of distiller's grains based on the total mass m1 of the distiller's grains (i.e. the total sample mass) and the mass m2 of the agglomerated distiller's grains (i.e. the mass of the agglomerated part) transmitted by the first detection module through the following formula (4):

[0175] The control unit is configured to obtain the first moisture content M1 based on the obtained A1, the moisture content b of the raw distiller's grains transmitted by the second detection module, the constant k1, and the first threshold value a through the following formula (1): M1 = b - k1 × (A1 - a) (1),

[0176] b represents the moisture content of the raw distiller's grains; k1 represents the constant; A1 represents the parameter representing the agglomeration rate that exceeds or equals the preset first threshold value; and a represents the first threshold value.

[0177] The first detection module is configured to collect the distiller's grains at the manually confirmed sampling point or the randomly generated sampling point, and to weigh the total mass m1 of the distiller's grains and the mass m2 of the agglomerated distiller's grains, respectively.

[0178] The second detection module is configured to detect the moisture content b of the raw distiller's grains.

[0179] The mechanical module is configured to, when A1 is not less than a, use the following filter pressing steps to filter press the original distiller's grains to a first moisture content M1:

[0180] preset first pressure value pulse filter pressing;

[0181] preset second pressure value filter pressing for a preset first time length;

[0182] preset third pressure value filter pressing for a preset second time length;

[0183] third pressure value pulse filter pressing, wherein the first time length is less than the second time length, and the second pressure value is greater than the third pressure value.

[0184] Preferably, the operation program of the distiller's grains drying system is as follows:

[0185] Input: first threshold value a, constant k1, moisture content b of the original distiller's grains;

[0186] The sampling volume of each sampling point after random sampling is calculated using the following formula:

[0187] rand(a,b) represents generating a random number in the interval [a,b], m i is the mass of the i-th sampling point, the total volume of the original distiller's grains is M, and the number of sampling points to be selected is n (n≥3),

[0188] According to formula (4), samples m1 (i.e., the above m i ) corresponding to the random mass range are taken from the original distiller's grains, and the mass m2 of the screened nodules of these samples is weighed;

[0189] Calculate the average nodulation rate A avg :

[0190] Calculate the first moisture content M1: M1=b-k1×(A avg -a) (8).

[0191] Control the mechanical module to perform the following operations:

[0192] Pulse filter pressing at pressure P1;

[0193] Filter pressing at pressure P2 for time T1;

[0194] Filter pressing at pressure P3 for time T2;

[0195] Pulse filter pressing at pressure P3 until the moisture content of the distiller's grains reaches the first moisture content M1, wherein T1<T2 and P2<P3.

[0196] Table 1

[0197] Example 7

[0198] The present application relates to a kind of lost dry chemical processes.The content repeated with the foregoing example is omitted.The following technical features are applicable to the foregoing example, and vice versa, as long as there is no contradiction.

[0199] The step of S1 includes:

[0200] S1-1 confirms the first threshold value a of the current batch sample and constant k1 based on experience table, measures the moisture content b of original lost grain;

[0201] S1-2 determines at least three sampling points of original lost grain, weighs the total mass of original lost grain of the determined range of sampling points and the mass of screened agglomerated part, and obtains the parameter A2 representing the agglomeration rate of original lost grain based on the following formula:

[0202] S1-3 obtains the second moisture content M2 based on the following formula (2): M2=b-k2×(a-A2) (2),

[0203] b represents the moisture content of original lost grain; k2 represents a constant; A2 represents a parameter representing the agglomeration rate below the preset first threshold value; a represents the first threshold value;

[0204] S1-4, when the parameter A2 of the batch-provided original lost grain is lower than the preset first threshold value a of the related parameter representing the agglomeration rate, the original lost grain with the parameter A2 lower than the preset first threshold value a is mechanically pressure filtered to the second moisture content M2 in a solid-liquid separation manner.

[0205] According to a preferred embodiment, in the processing step S1, the batch-provided original lost grain with the parameter A2 lower than the preset first threshold value a of the related parameter representing the agglomeration rate is continuously mechanically pressure filtered in a solid-liquid separation manner based on the gradually increasing pressure provided.

[0206] According to a preferred embodiment, as shown in Table 2 and FIG. 2, the step of mechanical pressure filtration of original lost grain with the parameter A2 lower than the preset first threshold value a includes S1-4-1 pre-filtering stage, S1-4-2 incremental medium-pressure filtration stage and S1-4-3 incremental high-pressure filtration stage.

[0207] Preferably, S1-4-1 pre-filtering stage: the mechanical module provides initial filtration for the original lost grain at a set first pressure filtration pressure value.

[0208] Preferably, S1-4-2 incremental medium-pressure filtration stage: the mechanical module pressure filters the lost grain at a first pressure increase rate from the first pressure filtration pressure value until reaching the second pressure filtration pressure value.

[0209] Preferably, the S1-4-3 incremental high pressure filtration stage: the mechanical module filters the distiller's grains at a second pressure increase rate from the second pressure filtration pressure value until reaching a third pressure filtration pressure value.

[0210] Preferably, the first pressure increase rate is greater than the second pressure increase rate. Preferably, the first pressure filtration pressure value is selected from 0.1-0.5 Mpa. The second pressure filtration pressure value is selected from 0.5-1.0 Mpa. The third pressure filtration pressure value is selected from 0.5-1.5 Mpa.

[0211] The purpose of the pre-pressure filtration stage is to preliminarily discharge the free water in the distiller's grains and form a preliminary filter cake structure. The pressure filtration under a low pressure state makes the distiller's grains uniformly distributed on the filter cloth (or filter frame). The pressure filtration in the incremental medium pressure filtration stage is used to further discharge water and increase the density of the filter cake and reduce the water content in the filter cake, and this stage sets the filter cake at a second pressure filtration pressure value higher than the first pressure filtration pressure value. The pressure filtration in the incremental high pressure filtration stage is used to discharge water to the maximum extent to form a stable and dry filter cake. In this process, the second pressure increase rate should be less than the first pressure increase rate to avoid filter cake rupture or filter cloth (filter frame) blockage. The operation of slowly increasing the pressure to squeeze the distiller's grains can provide a stable detection environment for detecting the moisture content of the distiller's grains. After the moisture content of the distiller's grains is less than the second moisture content, the mechanical module can directly reduce the pressure value to 0 to unload the filter cake.

[0212] Preferably, the operation program of the distiller's grains drying system is as follows:

[0213] Input: first threshold value a, constant k2, moisture content b of raw distiller's grains;

[0214] The sampling volume of each sample point after random sampling is calculated using the following formula:

[0215] rand(a,b) represents generating a random number in the interval [a,b], m i is the mass of the i th sample point, the total volume of the raw distiller's grains is M, and the number of sample points to be selected is n (n≥3),

[0216] According to the random mass range generated by formula (4), samples m1 (i.e. the above m i ) corresponding to the mass are taken from the raw distiller's grains, and the mass m2 of the screened clumped part of these samples is weighed;

[0217] Calculate the average clumping rate A avg :

[0218] Calculate the second moisture content M2: M2=b-k2×(a-A avg) (9);

[0219] The control mechanical module performs the following operations:

[0220] continuously filter-pressing the first filter-pressing pressure value P1 for a preset length of time;

[0221] The mechanical filter-pressing pressure is regulated by the following formula until the second filter-pressing pressure value P2 is reached: P2 = P1 + r1 x t (10),

[0222] r1 is the first pressure growth rate, and t is the duration time;

[0223] The mechanical filter-pressing pressure is regulated by the following formula until the third filter-pressing pressure value P3 is reached: P3 = P2 + r2 x t (11),

[0224] r2 is the first pressure growth rate, t is the duration time, and r1 > r2.

[0225] Table 2

[0226] Example 8

[0227] This embodiment proposes a dewatering treatment method and system based on the agglomerate rate of distiller's grains. Repetitive contents of the foregoing embodiments are omitted. The following technical features are applicable to the foregoing embodiments, provided that there is no contradiction, and vice versa.

[0228] The drying module used for providing the distiller's grains with warming or constant-temperature dewatering, for example, is a paddle dewatering device or a cyclone dewatering device.

[0229] According to a preferred embodiment, as shown in FIG. 3, for the distiller's grains filter-pressed to the first water content, the first water content of the distiller's grains is subjected to constant-temperature dewatering at the first temperature corresponding to the related parameter characterizing the agglomerate rate until the second water content is reached, in a manner of removing the water and the gas affecting the agglomerate rate in the distiller's grains, and then the distiller's grains subjected to the constant-temperature dewatering to the second water content are subjected to warming dewatering.

[0230] According to a preferred embodiment, as shown in FIG. 3, for the distiller's grains filter-pressed to the second water content, the second water content of the distiller's grains is subjected to warming dewatering at the first temperature corresponding to the related parameter characterizing the agglomerate rate. The warming dewatering starts to warm up at the first temperature corresponding to the related parameter characterizing the agglomerate rate in time, until the second temperature lower than the critical point of combustion of the distiller's grains is reached and the second temperature is maintained until the distiller's grains reach the third water content thereof.

[0231] Preferably, the drying module is configured to: based on the instruction indicating the first temperature transmitted by the control unit, maintain the first temperature for the first water content of the distillers grains; as shown in FIG. 3, continuously increase the temperature from the first temperature to a second temperature lower than the critical point of combustion of the distillers grains, continuously maintain the second temperature lower than the critical point of combustion of the distillers grains before the water content of the distillers grains decreases to a third water content, or stop heating before the first temperature increases to the second temperature lower than the critical point of combustion of the distillers grains, the water content of the distillers grains decreases to the third water content.

[0232] Preferably, the drying module is configured to: based on the instruction indicating the first temperature transmitted by the control unit, continuously increase the temperature from the first temperature to a second temperature lower than the critical point of combustion of the distillers grains for the second water content of the distillers grains, continuously maintain the second temperature lower than the critical point of combustion of the distillers grains before the water content of the distillers grains decreases to a third water content, or stop heating before the first temperature increases to the second temperature lower than the critical point of combustion of the distillers grains, the water content of the distillers grains decreases to the third water content.

[0233] Preferably, the control unit is configured to: based on the set empirical table, obtain the first temperature for the second water content of the distillers grains.

[0234] Preferably, the operation program of the distillers grains drying system is as follows:

[0235] The drying process:

[0236] Wherein: T1 is the first temperature of the distillers grains with the first water content; T2 is the first temperature of the distillers grains with the second water content; 表格 T(t) is the temperature at time t. T3 is the second temperature lower than the critical point of combustion of the distillers grains; w1 and w2 are the first water content and the second water content, respectively; w3 is the third water content. max T(t) is the temperature at time t.

[0237] It is considered that the dehydration process is the last process in the dehydration flow, therefore, the highest temperature of the second temperature in the process cannot exceed 335℃ (the critical point of combustion of dry distillers grains). The highest temperature of the first temperature cannot exceed 70℃ (the risk of reducing the protein denaturation in the distillers grains). When the water content of the distillers grains decreases to the preset third water content, the heating or constant temperature dehydration of the distillers grains is stopped.

[0238] Preferably, the third water content ranges from 5% to 18%. Preferably, the third water content is 5%, 8%, 10%, 15%, 16%, 17% or 18%.

[0239] Specifically, the embodiment provides a processing procedure of high-clumping-rate spent grains, and the steps are as follows:

[0240] Original spent grain detection: the initial moisture content of the original spent grain is 65%, and the first detection module detects that the clumping rate is 20% (for example, the first threshold of the clumping rate is set to 15%);

[0241] Mechanical pressure filtration dewatering: the first detection module sends the detection result to the mechanical module, the mechanical module receives the data, judges that the clumping rate of the original spent grain is excessive, and thus low-pressure slow pressure filtration (for example, the parameters are set to a pressure of 0.3-0.8 MPa and a rate of 0.1 MPa / min) is used to process the original spent grain, and the target dewatering is to a first moisture content (for example, set to 50%), so as to avoid excessive compaction to cause hardening of clumps. In the process, the pre-crushing blade group (for example, the rotating speed is set to 100 r / min) cuts the initial clumps, and the filter plate vibrates slightly (for example, the frequency is set to 20 Hz) to loosen the particles.

[0242] Drying treatment: the drying module first processes the spent grain with a moisture content of 35% at a constant temperature of 60°C for about 30 min, and the moisture content is reduced to 25%; then the temperature is increased to 80°C, and the dewatering is continued to a final moisture content of 10%. After drying, the hard clumps formed in the drying process are crushed by a centrifugal crusher (for example, the rotating speed is set to 800 r / min).

[0243] Screening and product separation: the screening module is separated by a vibrating screen, the high-fiber spent grain with a low protein content (oversize) is preferably conveyed by gas to a pyrolysis reactor, and the organic matter-rich spent grain with a high protein content (undersize) is preferably packaged as a feed raw material.

[0244] The embodiment also provides a processing procedure of low-clumping-rate spent grain, and the steps are as follows:

[0245] Original spent grain detection: the initial moisture content of the original spent grain is 60%, and the first detection module detects that the clumping rate is 10% (for example, the first threshold of the clumping rate is set to 15%);

[0246] Mechanical pressure filtration dewatering: the first detection module sends the detection result to the mechanical module, the mechanical module receives the data, judges that the clumping rate of the original spent grain is not excessive, and thus high-pressure rapid pressure filtration (for example, the parameters are set to a pressure of 0.5-1.2 MPa and a rate of 0.2 MPa / min) is used to process the original spent grain, and the target dewatering is to a second moisture content (for example, set to 35%), and the filter cloth self-cleaning device automatically cleans the pores after pressure filtration.

[0247] Drying treatment: the drying module is started at a constant temperature of 70°C, and then the temperature is increased to 90°C at a rate of 10°C / min, and the dewatering is directly to a final moisture content of 10%.

[0248] Screening and product separation: the screening module removes foreign matter by an optical-electric sorting machine, and the undersize (e.g., with a protein content of 20%) is used as a feedstock.

[0249] The dehydration treatment system based on the caking rate of discarded distiller's grains provided in this embodiment realizes accurate control of the caking rate, optimization of dehydration energy consumption, and high-value utilization of products, thereby providing an industrialized solution for distiller's grains resource utilization.

[0250] Embodiment 9

[0251] This embodiment relates to a discarded distiller's grains drying system. This embodiment also relates to a discarded distiller's grains treatment system taking viscosity in discarded distiller's grains as a classification standard for pressure filtration. Repetitive contents of the foregoing embodiments are omitted. The following technical features are applicable to the foregoing embodiments unless contradictory, and vice versa.

[0252] Since proteins and cellulose are the components with the highest content of organic matter in discarded distiller's grains (up to more than 60%), the organic matter in this application is, for example, proteins; proteins and cellulose; proteins, starch and cellulose; cellulose; starch; cellulose and starch; proteins, starch, cellulose and fat, considering the retention of proteins and / or cellulose in the actual screening process (for subsequent participation in processing feed).

[0253] The method for detecting the content of organic matter includes dry burning method (suitable for detection of various contents of organic matter), near-infrared spectroscopy analysis (suitable for detection with relatively high accuracy), ultraviolet spectrophotometer method (suitable for detection of protein content alone), and enzyme method (suitable for detection of cellulose, starch or both contents alone). Based on the requirements set for the detection of organic matter, the first detection module includes related equipment for detecting the content of organic matter by dry burning method, related equipment for detecting the content of organic matter by near-infrared spectroscopy analysis, related equipment for detecting the content of organic matter by ultraviolet spectrophotometer method, and / or related equipment for detecting the content of organic matter by enzyme method.

[0254] The threshold value of the content of organic matter can be set according to the experience table of relevant personnel, for example: the first threshold value is set differently for discarded distiller's grains produced by different types of white spirit, discarded distiller's grains produced in different seasons, or discarded distiller's grains produced from different raw materials.

[0255] According to a preferred embodiment, the mechanical module mechanically filters the original discarded distiller's grains according to the process parameters of each batch by updating the preset first threshold value for each batch.

[0256] The storage component of the control unit stores the first process parameters, the second process parameters and the first threshold value. Preferably, the first process parameters representing the moisture content of the raw distiller's grains are measured by the second detection module. The first process parameters measured by the second detection module are sent to the control unit and stored in the storage component. Preferably, the second process parameters corresponding to the batch are inputted into the storage component of the control unit. More preferably, the second process parameters are process parameters that affect the distiller's grains' pelletization rate. The first threshold value for each batch is inputted into the storage component of the control unit.

[0257] The control unit generates the corresponding empirical table with the first process parameters, the second process parameters and the first threshold value stored in the storage component of the control unit. The first threshold value is the dependent variable corresponding to the independent variables of the first process parameters and the second process parameters.

[0258] When the first process parameters updated corresponding to the current batch and the second process parameters updated corresponding to the current batch are received, the control unit updates the first threshold value corresponding to the current batch by calling the empirical table pre-stored in the storage module. The control unit updates the first threshold value corresponding to the current batch with the first process parameters and the second process parameters closest to the first process parameters and the second process parameters of the current batch and existing in the empirical table as the reference independent variables for updating the first threshold value.

[0259] The empirical table for the first threshold value representing the pelletization rate can be a table filled by the operator according to experience, as shown in Table 3 below.

[0260] Table 3

[0261] It should be noted that the first threshold value representing the pelletization rate (for example, the pelletization mass ratio) can be pre-stored in the control unit according to the experience of the operator, which can involve factors including but not limited to the type of pit, the moisture content of the raw distiller's grains, the production time of the distiller's grains (which can be accurate to the day), the type of application of the Daqu, the raw material of the brewing fermented grains, the pH value of the raw distiller's grains.

[0262] The first temperature corresponding to the parameters related to the pelletization rate can also be obtained by relying on the empirical data table. The operator can determine the dehydration temperature according to the source of the distiller's grains and the first parameter, the second parameter or the third parameter in the distiller's grains, for example, Table 4.

[0263] Table 4

[0264] According to a preferred embodiment, the distiller's grains separated by screening the high-fiber distiller's grains and the organic matter-enriched distiller's grains after heating and dehydration in a differential separation manner based on protein content, to obtain the sieve residue for pyrolysis and the sieve underfall for feed.

[0265] The screening module is, for example, a vibrating or tumbling screening device. According to the experimental data shown in Table 5, the screenings obtained under different conditions can be screened through a 60 or 80 mesh screen without affecting the screening of crude protein.

[0266] Table 5

[0267] In the above examples, after different pressure filtration and warming treatments, the moisture content of the screenings is significantly reduced, and finally can be separated through a 60 or 80 mesh screen, and the screening process does not significantly affect the content of crude protein. This shows that through reasonable pressure filtration and warming treatment, not only the moisture content of the screenings can be effectively reduced, but also more efficient screening can be achieved.

[0268] In addition, the screenings for pyrolysis are usually high-fiber content parts, which are more suitable for pyrolysis treatment due to their lower moisture content and higher calorific value, thereby producing high-quality pyrolysis gas and biochar.

[0269] In addition, the screenings for feed are usually parts rich in organic matter and crude protein, and the crude protein content of the screenings after screening can be kept at a high level, such as 17.6% in Example 3, which makes these screenings more suitable as feed or feed additives to improve the nutritional value of the feed. By implementing the above treatment method, the moisture content of the screenings can be effectively reduced, efficient screening can be achieved, and the crude protein content in the screenings can be maintained or improved, ultimately realizing the efficient utilization of the screenings in pyrolysis and feed. This method combines pressure filtration, warming and screening and other known technologies, and has significant technical effects and practical application value.

Claims

1. A method of dry distiller's grain processing, characterized by, The method comprises the following steps: S1, providing the original spent grains in batches in a mechanical filter-pressing manner, wherein the first moisture content and the second moisture content of the spent grains are provided in a manner related to the parameters for characterizing the agglomeration rate, and the first moisture content is greater than the second moisture content; S2, dehydrating the spent grains in a manner of removing the water and the gas affecting the agglomeration rate in the spent grains, wherein: S2.1, for the spent grains pressed to the first moisture content, constant-temperature dehydration is performed on the spent grains at the first temperature corresponding to the parameters for characterizing the agglomeration rate until the second moisture content is reached, and then the spent grains dehydrated to the second moisture content are subjected to temperature-increasing dehydration, or S2.2, for the spent grains pressed to the second moisture content, temperature-increasing dehydration is performed on the spent grains of the second moisture content, wherein the temperature-increasing dehydration starts to increase the temperature from the first temperature corresponding to the parameters for characterizing the agglomeration rate in time until the second temperature lower than the critical point of the spent grains combustion is reached and the second temperature is maintained until the spent grains reach the third moisture content; S3, screening the dehydrated high-fiber spent grains and the organic matter-rich spent grains in a manner of differential separation based on the protein content, to obtain the sieve residue for pyrolysis and the sieve underfall for feed.

2. The method of claim 1, wherein, In the S1 step, the mechanical module for mechanical filter-pressing dehydration of the original spent grains exerts a squeezing action on the original spent grains according to the applied pressure, and the part of the liquid containing free water and capillary water is discharged through the pores of the solid substances in a manner of retaining the solid substances in the original spent grains and transferring the solid substances to the drying module for removing the water and the gas affecting the agglomeration rate in the solid particles.

3. The method according to claim 1 or 2, wherein In the S1 step, the mechanical module updates the preset first threshold value of the parameters for characterizing the agglomeration rate of the batch of spent grains according to the process parameters affecting the agglomeration rate of each batch of original spent grains, and then performs mechanical filter pressing on the batch of original spent grains based on the updated preset first threshold value.

4. The method according to any one of claims 1 to 3, characterized in that, In the S2 step, the drying module provides heat to the spent grains transferred from the mechanical module and affected by the capillary water and the bound water present therein to be at the first moisture content or the second moisture content, and dehydrates the spent grains of the first moisture content in a manner of removing the capillary water and the bound water distributed in the solid substances in the spent grains to reduce the agglomeration rate of the spent grains.

5. The method according to any one of claims 1 to 4, wherein In the S1 step, the second detection module for detecting the moisture content of the original spent grains collects the moisture content of the original spent grains and transmits it to the control unit, wherein the control unit for generating the corresponding spent grain drying treatment method calculates the first moisture content M1 of the original spent grains whose parameters for characterizing the agglomeration rate exceed or equal to the preset first threshold value based on the received moisture content transmitted by the second detection module through formula (1): M1=b-k1×(A1-a) (1), b represents the moisture content of the original spent grains; k1 represents a constant; a represents the first threshold value; A1 represents the parameters exceeding or equal to the preset first threshold value a.

6. The method of claim 1 to 5, wherein In the S1 step, a second detection module for detecting the moisture content of the raw lossen collects the moisture content of the raw lossen and transmits it to the control unit, wherein the control unit for generating the corresponding lossen drying method calculates the second moisture content M2 of the raw lossen representing the agglomeration rate below the first threshold value based on the received moisture content transmitted by the second detection module through formula (2): M2 = b - k2 × (a - A2) (2), b represents the moisture content of the raw lossen; k2 represents a constant; a represents the first threshold value; A2 represents the related parameter below the first threshold value a.

7. The method of claim 1-6, wherein At least one of the related parameters for representing the agglomeration rate is set as a first parameter representing the organic matter content, wherein, When the first parameter exceeds or is equal to the first threshold value, the mechanical module mechanically filters the raw lossen with the first parameter exceeding or being equal to the first threshold value to the first moisture content calculated by the control unit according to formula (1).

8. The method of claim 1-7, wherein At least one of the related parameters for representing the agglomeration rate is set as a first parameter representing the organic matter content, wherein, When the first parameter is below the first threshold value, the mechanical module filters the raw lossen with the first parameter below the first threshold value to the second moisture content calculated by the control unit according to formula (2).

9. The torrefaction process according to any one of claims 1 to 8, characterized in that, The relevant parameters for characterizing the agglomeration rate include a second parameter calculated from the mass of the agglomerated fraction and the total sample mass, the second parameter being calculated by equation (3):

10. The torrefaction process according to any one of claims 1 to 9, characterized in that, In the processing step S2, the dehydration treatment includes the following steps: taking the moisture content of the lossen reduced to the third moisture content available as dry feed as the judgment basis for stopping the dehydration treatment, and performing the dehydration treatment of the lossen filtered to the first moisture content or the lossen filtered to the second moisture content with the moisture content reduced to the second moisture content from the first temperature to the preset maximum temperature value.

11. The torrefaction process according to any one of claims 1 to 10, characterized in that, When the provided lossen is the first moisture content, the dehydration is constant at the first temperature until the second moisture content, and then the temperature is raised from the first temperature until the lossen reaches the third moisture content; if the third moisture content is not reached before the combustion critical point, the dehydration is constant at the temperature before the combustion critical point until the third moisture content is reached.

12. The torrefaction process according to any one of claims 1 to 11, characterized in that, In the processing step S1, the related parameters for representing the agglomeration rate further include a third parameter represented by a pressure value, and the first threshold value can be set as the pressure parameter.

13. A distillers dried grains processing system, comprising: The system includes a mechanical module for mechanically filtering and dehydrating the raw lossen, a first detection module for detecting at least one of the related parameters for representing the agglomeration rate in the raw lossen, a drying module for constant temperature heating or temperature rising heating of the lossen, and a screening module for screening the dried lossen, wherein the system is configured to: The mechanical module mechanically filters the raw lossen provided in batches in a solid-liquid separation manner, The drying module dehydrates the lossen in a manner of removing water and gas affecting the agglomeration rate in the lossen, The screening module screens the lossen separated after the heated dehydration in a differential separation manner based on the protein content, to obtain the oversize for pyrolysis and the undersize for feed.

14. The torrefaction system of claim 13, wherein, when the at least one parameter of the original spent grain detected by the first detection module for characterizing the caking rate exceeds or equals a preset first threshold of the relevant parameter for characterizing the caking rate, the mechanical module filters the original spent grain with the relevant parameter exceeding or equaling the preset first threshold to a first water content; when the at least one parameter of the original spent grain detected by the first detection module for characterizing the caking rate is lower than the preset first threshold of the relevant parameter for characterizing the caking rate, the mechanical module filters the original spent grain with the relevant parameter lower than the preset first threshold to a second water content, wherein the first water content is greater than the second water content.

15. The torrefaction system of claim 13 or 14, wherein, For the spent grain filtered to the first water content, the drying module performs constant temperature dewatering on the spent grain of the first water content at a first temperature corresponding to the relevant parameter for characterizing the caking rate until a second water content is reached, and then performs temperature increasing dewatering on the spent grain dewatered to the second water content; or for the spent grain filtered to the second water content, the drying module performs temperature increasing dewatering on the spent grain of the second water content at the first temperature corresponding to the relevant parameter for characterizing the caking rate.

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