A grain moistening process for traditional Maotai-flavor liquor production

Abstract

The present application relates to the field of brewing technology, and discloses a grain moistening process for traditional Maotai-flavor liquor production, which comprises a grain moistening mode of twice water injection and twice turning, and the twice water injection and twice turning comprises the following steps: dividing raw materials required for single batch of grain moistening into N sub-heaps, stacking the sub-heaps into a conical shape, and digging a nest-shaped water injection port downward at the top of each sub-heap; injecting 8 / 13 of the total amount of single-time grain moistening water injection into the water injection port of the first sub-heap, and fully turning the first sub-heap; after a certain period of standing, injecting 5 / 13 of the single-time grain moistening water injection amount into the first sub-heap and turning it, so as to solve the technical problem of low moisture content of sorghum after the sorghum is moistened by using the traditional grain moistening mode.

Description

Technical Field

[0001] This invention relates to the field of brewing technology, specifically to a grain-moistening process for the production of traditional soy sauce-flavored baijiu. Background Technology

[0002] In the production process of baijiu, "moistening grains" refers to moistening the raw materials with water before steaming or cooking, so that the starch granules in the raw materials can evenly absorb a certain amount of water, achieving initial swelling of starch and rupture of the cell walls of starch granules, thus creating conditions for the gelatinization of raw materials during steaming or cooking. The existing traditional sauce-flavored baijiu brewing adopts the traditional moistening grain process, which involves moistening grains three times, and each moistening grain is moistened in the same way, using the traditional moistening method.

[0003] The traditional method of moistening grain involves first injecting the entire amount of water required for a single moistening process into the grain pile, then thoroughly turning the grain pile over twice; this completes the single moistening process. The total moistening time is approximately 24 hours, and the water temperature is above 90 degrees Celsius.

[0004] With the development of baijiu brewing technology, consumers have higher requirements for the taste of baijiu, and the baijiu market is becoming increasingly competitive. Brewing costs have also become one of the factors to consider in market competition. When sorghum is used as the raw material for brewing traditional sauce-flavored baijiu, the traditional grain moistening method is used as a three-stage moistening method in the initial and rough stages. After moistening, the sorghum has a low moisture content, which results in a low gelatinization rate after cooking and a low final alcohol yield, leading to higher raw material costs. Summary of the Invention

[0005] The present invention aims to provide a grain moistening process for the production of traditional sauce-flavored liquor, in order to solve the technical problem that the sorghum has a low moisture content after being moistened by the traditional grain moistening method in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a grain-moistening process for the production of traditional sauce-flavored baijiu, comprising a grain-moistening method of two water injections and two turnings, wherein the two water injections and two turnings include the following steps:

[0007] S1. Divide the raw materials required for a single batch of grain into N sub-piles, N≥2, and stack the sub-piles into a cone shape. Dig out a recessed water inlet at the top of the sub-piles.

[0008] S2. Inject water into the water inlet of the first sub-pile for the first time. The amount of water injected for the first time is 8 / 13 of the total amount of water injected into the sub-pile for a single grain rinsing. The water temperature shall not be lower than 95℃. Then, turn the first sub-pile over for the first time.

[0009] S3. After the first sub-pile has completed the first water injection and the first stirring, let it stand. When the production environment temperature is 20℃, the standing time is ≥30min.

[0010] S4, after the waiting is completed, the water injection port on the top of the first sub-pile is dug out, the second water injection is carried out on the water injection port of the first sub-pile, the water quantity of the second water injection is 5 / 13 of the single water injection quantity of the sub-pile, the water injection temperature is not less than 95°C, and the first sub-pile is subjected to the second turning;

[0011] The remaining sub-piles repeat the grain moistening steps S2-S4 until the N sub-piles complete the twice water injection and the twice turning, and then the once grain moistening is completed.

[0012] The principle and advantages of the scheme are as follows: when the single water injection quantity is large, the water quantity is injected twice to avoid the waste of water flow caused by the fact that the sorghum cannot absorb the water in time when the water is added in large quantity at one time, and the water cannot be effectively combined with the sorghum; the single batch of sorghum is divided into multiple sub-piles, each sub-pile is processed separately, and the grain pile is turned over after each injection of hot water to ensure that each grain of sorghum can be in contact with the hot water;

[0013] Since the temperature of the grain pile is positively correlated with the water absorption efficiency, the hot water with a temperature of not less than 95°C can quickly raise the temperature of the sorghum, improve the grain moistening efficiency, and improve the water absorption capacity of the sorghum. The first water injection is more than the second water injection, which is to quickly raise the temperature of the sorghum at room temperature; when the waiting time between the first water injection and the second water injection of the sub-pile is too long, the temperature of the grain pile after the waiting is not high enough to support the efficient water absorption of the sorghum, the second water injection raises the temperature of the grain pile again, prolongs the time during which the grain pile is in the efficient water absorption state, and the interval time between the two water injections is sufficient for the combination of the sorghum and the hot water;

[0014] Through the grain moistening method, the water content of the sorghum can be effectively improved in the same water quantity and the same time, for example, the water content of a certain raw material can be increased by 10% by using the traditional grain moistening method. Therefore, the water content of the raw material can be increased by at least 20% by using the twice water injection and twice turning grain moistening method under the same water injection quantity and the same time consumption. Furthermore, the gelatinization rate of the batch of sorghum after steaming and cooking is improved, the final liquor yield is improved, the production cost is reduced, and a large number of experiments show that the grain moistening by the method can reduce the tannin substances in the fermented grains and the probability of hard core, raw core and white core of the sorghum in the subsequent process, and effectively improve the quality of the liquor.

[0015] Preferably, as an improvement, in the twice water injection and twice turning grain moistening method, when the production environment temperature is 20°C, the waiting time is ≤35 min.

[0016] The improved beneficial effect is: if the interval time is too short, the grain pile starts secondary water injection before absorbing the first water injection, causing water to overflow; if the interval time is too long, the heat of the grain pile is largely dissipated, the second water injection cannot raise the temperature of the grain pile to the ideal temperature, and the water absorption capacity of the grain pile per unit time decreases at a lower temperature, affecting the water absorption efficiency of the grain pile; when the water absorption efficiency of the grain pile is low or the grain pile has completely absorbed the first water injection, blindly prolonging the interval time will increase production cost and reduce production efficiency; when the production environment temperature is 20℃, the standing time is controlled within 30-35min, which can improve the average water absorption efficiency of the grain pile and reduce the production cost.

[0017] Preferably, as an improvement, three times of grain moistening are included, the total water injection amount of the three times of grain moistening is 55% of the total weight of the raw materials, the water injection amount of the first time of grain moistening accounts for 47.3% of the total water injection amount, the water injection amount of the second time of grain moistening accounts for 30.9% of the total water injection amount, and the water injection amount of the third time of grain moistening accounts for 21.8% of the total water injection amount; the allowable water injection error amount of each time of grain moistening is 1% of the weight of the raw materials.

[0018] The first time of grain moistening adopts the grain moistening mode of two times of water injection and two times of turning.

[0019] The improved beneficial effect is: after three times of grain moistening, the gelatinization rate of the sorghum after cooking can be greater than 90%; after three times of grain moistening, the water absorption capacity of the sorghum is close to saturation, and even if the sorghum is moistened again, the water content of the sorghum increases slightly, and the influence on the final gelatinization rate is weak; each time of grain moistening will increase the time and labor cost, and therefore the input-output ratio of three times of grain moistening is the highest; because the water injection amount of the first time of grain moistening is large, the grain moistening mode of two times of water injection and two times of turning is adopted, which can avoid the waste of water and heat, and facilitate the control of the grain moistening of each pile of raw materials to improve the water content of the sorghum.

[0020] Preferably, as an improvement, the interval between the end of the first time of grain moistening and the start of the second time of grain moistening is 2 hours, and the interval between the end of the second time of grain moistening and the start of the third time of grain moistening is 4 hours.

[0021] The improved beneficial effect is: sufficient time is left for the sorghum to absorb water.

[0022] Preferably, as an improvement, after the end of the first time of grain moistening, if the water content of the raw materials is less than 25%, the second time of grain moistening adopts the grain moistening mode of two times of water injection and two times of turning.

[0023] The improved beneficial effect is: the water content of 25% is used as a judgment standard, which can measure whether the water absorption capacity of the sorghum in the first time of grain moistening has reached the upper limit; if the condition of 25% is not met, the water absorption capacity of the sorghum can be improved again in the second time of grain moistening by adopting the grain moistening mode of two times of water injection and two times of turning, which can avoid the low water content of the sorghum in the subsequent pit entry, and affect the liquor yield and the quality of the liquor.

[0024] Preferably, as an improvement, after the second grain moistening, if the moisture content of the raw materials is less than 35%, the third grain moistening adopts the two-water-injection-and-two-turns moistening method.

[0025] The improvement has the beneficial effect that the moisture content of 35% is used as a criterion to measure whether the water absorption capacity of sorghum in the second grain moistening process has reached the upper limit. If the condition of 35% is not met, the water absorption capacity of sorghum can be improved again in the third grain moistening process through the two-water-injection-and-two-turns moistening method, thereby avoiding the low moisture content of sorghum in subsequent pit entry, which affects the liquor yield and liquor quality.

[0026] Preferably, as an improvement, the first turning and the second turning both adopt comprehensive turning, which includes the following steps:

[0027] a. Push the raw materials at the four sides and the bottom of the conical grain pile into the water injection port until no obvious water overflow occurs;

[0028] b. Perform displacement turning, which is to have two people stand on the two sides of the grain pile and fan out the raw materials in the same direction. When shoveling, the shovel is close to the ground, and the two people cross and throw out, until the grain pile is completely transferred to the next position, and the grain pile is shaped into a cone.

[0029] The improvement has the beneficial effect of avoiding water overflow while ensuring that each grain of sorghum can be fully contacted with hot water.

[0030] Preferably, as an improvement, it also includes a one-water-injection-and-two-turns moistening method, which includes the following steps:

[0031] S1. Divide the raw materials needed for a single batch of grain moistening into N sub-piles, N≥2, and stack the sub-piles into a cone. Dig a nest-shaped water injection port downward at the top of the sub-pile;

[0032] S2. Inject part of the single moistening water injection amount into the water injection port of the first sub-pile, and perform local turning of the first sub-pile;

[0033] S3. While continuously turning the first sub-pile, gradually inject the remaining water of the single moistening water injection amount, until the single moistening water injection amount is fully injected, and there is no obvious water overflow in the first sub-pile. The injection temperature is not less than 95°C, and one water injection is completed.

[0034] S4. After the water injection is completed, perform two consecutive displacement turnings of the first sub-pile to complete two turnings.

[0035] Repeat the moistening steps S2-S4 for the remaining sub-piles until N sub-piles complete one water injection and two turnings, and then one moistening is completed.

[0036] Preferably, as an improvement, if the moisture content of the raw materials is not less than 25% after the first grain moistening, the second grain moistening adopts the one-time water injection and two-time turning moistening method; and if the moisture content of the raw materials is not less than 35% after the second grain moistening, the third grain moistening adopts the one-time water injection and two-time turning moistening method.

[0037] The improvement has the beneficial effects that: when the single water injection amount is small, the one-time water injection does not cause water overflow; when the water absorption efficiency of sorghum has reached the upper limit, the one-time water injection and the two-time water injection have the same effect on the improvement of the water absorption capacity of sorghum; and the one-time water injection and two-time turning moistening method can also ensure that each sorghum grain is fully contacted with hot water when the water injection amount is small. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a grain moistening process flow chart for traditional Maotai-flavor liquor production.

[0039] Figure 2 It is a two-time water injection and two-time turning moistening method flow chart.

[0040] Figure 3 It is a one-time water injection and two-time turning moistening method flow chart. DETAILED DESCRIPTION

[0041] The following will be further described in detail through specific embodiments:

[0042] Embodiment 1

[0043] The application provides a grain moistening process for traditional Maotai-flavor liquor production, which takes red grain as the raw material for Maotai-flavor liquor brewing, and discloses a “two-time water injection and two-time turning” moistening method. Figure 2 As shown in the accompanying drawings, the “two-time water injection and two-time turning” includes the following steps:

[0044] S1, divide the raw materials required for single batch moistening into N sub-piles, N≥2, and pile the sub-piles into a conical shape, and dig a nest-shaped water injection port downward at the top of the sub-pile;

[0045] S2, perform the first water injection to the water injection port of the first sub-pile, the water injection amount of the first water injection is 8 / 13 of the total water injection amount of single moistening of the sub-pile, the water injection temperature is not less than 95℃, and the first turning of the first sub-pile is performed;

[0046] S3, repeat the steps in S2 to the remaining sub-piles, so that the N sub-piles all complete the first water injection and the first turning;

[0047] S4, dig the water injection port at the top of the first sub-pile, perform the second water injection to the water injection port of the first sub-pile, the water injection amount of the second water injection is 5 / 13 of the water injection amount of single moistening of the sub-pile, the water injection temperature is not less than 95℃, and the second turning of the first sub-pile is performed;

[0048] S5. Repeat steps S2-S4 to the remaining sub-piles, so that all N sub-piles complete the second water injection and the second mixing.

[0049] Both the first and second mixing processes involve full mixing, which includes the following steps:

[0050] a. Push the raw materials around the cone-shaped grain pile and at the bottom into the water inlet until there is no obvious water overflow;

[0051] b. Then carry out displacement and mixing. Displacement and mixing involves two people standing opposite each other on both sides of the grain pile and scattering the raw materials in the same direction in a fan shape. When shoveling the grain, the shovel should be close to the ground, and the two people should scatter the grain in a cross manner until the entire grain pile is moved to the next position. At the same time, the grain pile is shaped into a cone shape.

[0052] Specifically, when the production environment temperature is 20℃, the time interval between the first water injection and the second water injection of the first sub-pile is 30-35 minutes; the water temperature for each injection is not lower than 95℃; each batch of raw materials requires three water treatments, with the total water input for the three water treatments being 55% of the total weight of the raw materials in a single batch; the water input for the first water treatment accounts for 47.3% of the total water input, the water input for the second water treatment accounts for 30.9% of the total water input, and the water input for the third water treatment accounts for 21.8% of the total water input; the allowable water input error for each water treatment is 1% of the raw material weight; the interval between the end of the first water treatment and the start of the second water treatment is 2 hours, and the interval between the end of the second water treatment and the start of the third water treatment is 4 hours;

[0053] The first soaking of each batch of raw materials adopts the method of "two water injections and two turnings".

[0054] As attached Figure 1 As shown, the second grazing method depends on the moisture content of the raw materials after the first grazing: if there is no soaking of raw materials after the first grazing and the moisture content of the raw materials is not less than 25%, then the second grazing adopts the "one-time watering and two-time turning" grazing method; if there is soaking of raw materials after the first grazing or the moisture content of the raw materials is less than 25%, then the second grazing adopts the "two-time watering and two-time turning" grazing method.

[0055] The method of the third grazing depends on the moisture content of the raw materials after the second grazing: if there is no soaking of the raw materials after the second grazing and the moisture content of the raw materials is not less than 35%, then the third grazing adopts the "one-time watering and two-time turning" grazing method; if there is soaking of the raw materials after the second grazing or the moisture content of the raw materials is less than 35%, then the third grazing adopts the "two-time watering and two-time turning" grazing method.

[0056] As attached Figure 3 As shown, the process of filling water twice involves the following steps:

[0057] S1, the raw materials required for single batch of grain moistening are divided into N sub-stacks, N≥2, and the sub-stacks are stacked in a conical shape, a nest-shaped water injection port is dug at the top of the sub-stacks, and the nest-shaped water injection port is downwardly recessed;

[0058] S2, a part of the single-time grain moistening water injection amount is injected into the water injection port of the first sub-stack, and the first sub-stack is locally turned over;

[0059] S3, while continuously turning over the first sub-stack, the remaining water injection amount of the single-time grain moistening water injection amount is gradually injected, until the single-time grain moistening water injection amount is completely injected, and there is no obvious water flow overflow in the first sub-stack, the water injection temperature is not lower than 95℃, and one-time water injection is completed;

[0060] S4, the first sub-stack is turned over twice in succession, and twice turning over is completed;

[0061] S5, steps S2-S4 are repeated for the remaining sub-stacks, so that the N sub-stacks complete one-time water injection and twice turning over.

[0062] Specifically, in this embodiment, 6750kg of sorghum is divided into 9 sub-stacks for grain moistening according to the total weight of the single batch of grain moistening, each sub-stack is 750kg, the water injection weight of the sub-stack is 412.5kg, 412.5kg of water is injected three times, 195kg of water is injected for the first time, 127.5kg of water is injected for the second time, and 90kg of water is injected for the third time, and the single-time grain moistening allowable error water amount of the sub-stack is 7.5kg;

[0063] At 20℃, the first-time grain moistening is performed on the single batch of sorghum, 120kg of 95℃ hot water is injected into the water injection port of the first sub-stack, and the sub-stack is turned over in an all-round manner, 120kg of 95℃ hot water is injected into the water injection port of the second sub-stack, and the sub-stack is turned over in an all-round manner, and the steps are repeated for the third to ninth sub-stacks, so that all the sub-stacks complete the first water injection and the first-time turning over, 75kg of 95℃ hot water is injected into the water injection port of the first sub-stack, and the sub-stack is turned over in an all-round manner, and the steps are repeated for the second to ninth sub-stacks, so that all the sub-stacks complete the second water injection and the second-time turning over;

[0064] It takes 3min to turn over a single sub-stack once in an all-round manner, and it takes about 30min to turn over the 9 sub-stacks in turn, so the total time required for the first-time grain moistening is about 60min; after the first-time grain moistening is completed, the batch of sorghum is allowed to stand for 2h, and the water content of the sorghum is detected; if there is no water soaking phenomenon at this time, and the water content of the raw materials is not lower than 25%, the second-time grain moistening adopts the "one-time water injection and two-time turning over" grain moistening mode;

[0065] The single batch of sorghum is subjected to second grain moistening, 127.5 kg of 95 DEG C hot water is required for the second grain moistening, a small amount of 95 DEG C hot water is injected into the water injection port of the first sub-pile, and local stirring is carried out, the remaining water is gradually injected during the stirring process, the local stirring is carried out until there is no obvious water overflow, the first sub-pile is subjected to displacement stirring twice, that is, "two people stand opposite to each other on both sides of the grain pile, and spread the raw materials in a fan shape in the same direction, the shovel is close to the ground during the shoveling, and the two people cross and spread, until the grain pile is completely transferred to the next position, and the grain pile is shaped as a cone", and the displacement stirring is continuously carried out twice; 127.5 kg of 95 DEG C hot water is injected into the water injection port of the second sub-pile, and the second sub-pile is subjected to displacement stirring twice, and the third to ninth sub-piles are subjected to the same step, so that all the sub-piles complete once water injection and twice stirring;

[0066] After the second grain moistening is completed, the batch of sorghum is allowed to stand for 4 h, and the water content of the sorghum is detected; if there is no water soaking phenomenon of the raw materials at this time, and the water content of the raw materials is not less than 35%, the third grain moistening adopts the "once water injection and twice stirring" grain moistening mode. Through the grain moistening process, the water content of the fermented grains is 37-41% when the sand is put into the pit, and the water content of the fermented grains is 38-42% when the rough sand is put into the pit.

[0067] Example 2

[0068] On the basis of example 1, four groups of sorghum are designed to adopt different grain moistening modes to reflect the grain moistening effect of different grain moistening modes;

[0069] Group A: the first grain moistening adopts the "twice water injection and twice stirring" grain moistening mode, the second grain moistening adopts the "once water injection and twice stirring" grain moistening mode, and the third grain moistening adopts the "once water injection and twice stirring" grain moistening mode;

[0070] Group B: the first grain moistening adopts the "twice water injection and twice stirring" grain moistening mode, the second grain moistening adopts the "twice water injection and twice stirring" grain moistening mode, and the third grain moistening adopts the "once water injection and twice stirring" grain moistening mode;

[0071] Group C: the first grain moistening adopts the "twice water injection and twice stirring" grain moistening mode, the second grain moistening adopts the "twice water injection and twice stirring" grain moistening mode, and the third grain moistening adopts the "twice water injection and twice stirring" grain moistening mode;

[0072] Group D: the first grain moistening adopts the "once water injection and twice stirring" grain moistening mode, the second grain moistening adopts the "once water injection and twice stirring" grain moistening mode, and the third grain moistening adopts the "once water injection and twice stirring" grain moistening mode;

[0073] Among them, the total amount of sorghum, water injection amount, interval time and grain moistening environment of the four groups are kept consistent; the water content, temperature value, gelatinization rate and retrogradation rate of the four groups of sorghum are recorded, and Tables 1 and 2 are obtained;

[0074] Table 1 Influence of different grain moistening processes on moisture content of sorghum

[0075]

[0076] Table 2 Influence of different grain moistening processes on temperature, gelatinization rate and reverse growth rate of sorghum

[0077]

[0078] Among them, because the temperature of sorghum at different depths in the grain pile is inconsistent, the area 5-15 cm in the surface layer of the grain pile is referred to as the upper layer area, the area 20-30 cm in the surface layer of the grain pile is referred to as the middle layer area, and the area 35-45 cm in the surface layer of the grain pile is referred to as the lower layer area. The temperature of sorghum in the middle layer area is selected as the comparison temperature in Table 1.

[0079] Gelatinization rate is an important indicator of steamed grains, and gelatinization degree is one of the key factors affecting liquor yield. Gelatinization refers to the process of converting starch into fermentable sugar. If the gelatinization degree is not high, starch cannot be fully converted into fermentable sugar, thereby affecting liquor yield.

[0080] Reverse growth rate refers to the proportion of reverse growth phenomenon. Sorghum reverse growth refers to the phenomenon that completely gelatinized sorghum appears hard core, raw core and white core in subsequent processes. High reverse growth rate can cause the liquor aroma to become weak, the liquor taste to become short and weak, and the aftertaste to become poor, thereby affecting one of the key factors affecting liquor quality.

[0081] As shown in Tables 1 and 2, the comparison between Group A and Group D shows that the grain moistening process used in the production of traditional Maotai-flavor liquor can effectively increase the moisture content of sorghum, effectively improve the gelatinization rate, and greatly reduce the reverse growth rate. In addition, the process can improve liquor quality, reduce production cost, and greatly enhance the market competitiveness of liquor produced by the process.

[0082] The comparison between Group A and Group B shows that when the second moistening meets the requirement of "two water injection and two turning", the use of "two water injection and two turning" has little effect on the water absorption capacity of sorghum. In addition, the small amount of hot water injected at a time reduces the temperature rise of the grain pile, which in turn causes the gelatinization rate of the moistened sorghum to decrease and the reverse growth rate to increase.

[0083] The comparison between Group A and Group C shows that when the third moistening meets the requirement of "two water injection and two turning", the use of "two water injection and two turning" can effectively improve the water absorption capacity of sorghum, thereby improving the water absorption efficiency. For example, the difference between the moisture content of sorghum after the third moistening and the moisture content of sorghum after the second moistening is 2.6% for Group A, and 3% for Group C.

[0084] The gelatinization rate and the retrogradation rate of the three groups A, B and C are compared with the group D, the three groups all use the "two-time water injection and two-time turning" in the grain moistening process, the final grain moistening effect is relatively improved compared with the traditional grain moistening process of the group D, the gelatinization rate is effectively improved, and the retrogradation rate is effectively reduced; and comparing the three groups A, B and C, the three-time grain moistening methods of the three groups are different, wherein the group A is the best, the group A has the highest gelatinization rate and the lowest retrogradation rate.

[0085] The above is only an embodiment of the present application, and the specific technical solutions and / or common knowledge of the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A grain-moistening process for the production of traditional sauce-flavored Baijiu, characterized in that, This includes a method of watering and turning the grain twice, which involves the following steps: S1. Divide the raw materials required for a single batch of grain into N sub-piles, N≥2, and stack the sub-piles into a cone shape. Dig out a recessed water inlet at the top of the sub-piles. S2. Inject water into the water inlet of the first sub-pile for the first time. The amount of water injected for the first time is 8 / 13 of the total amount of water injected into the sub-pile for a single grain rinsing. The water temperature shall not be lower than 95℃. Then, turn the first sub-pile over for the first time. S3. After the first sub-pile has completed the first water injection and the first stirring, let it stand. When the production temperature environment is 20℃, the standing time should be controlled to 30min-35min. S4. After the settling is complete, dig out the water inlet at the top of the first sub-pile and inject water into the water inlet of the first sub-pile for the second time. The amount of water injected for the second time is 5 / 13 of the amount of water injected into the sub-pile for the single grain rinsing. The water temperature is not lower than 95℃. Then, the first sub-pile is turned over for the second time. Repeat the grain-moistening steps S2-S4 for the remaining sub-piles until all N sub-piles have completed two water injections and two turnings, then one grain-moistening cycle is complete. The process includes three waterings, with the total water added in each watering being 55% of the total weight of the raw materials. The first watering accounts for 47.3% of the total water added, the second for 30.9%, and the third for 21.8%. The allowable error in watering for each watering is 1% of the weight of the raw materials. The first grain rinsing uses the method of two waterings and two turnings.

2. The grain-moistening process for traditional sauce-flavored liquor production according to claim 1, characterized in that: The interval between the end of the first grazing and the start of the second grazing is 2 hours, and the interval between the end of the second grazing and the start of the third grazing is 4 hours.

3. The grain-moistening process for traditional sauce-flavored liquor production according to claim 2, characterized in that: After the first grazing, if the moisture content of the raw materials is below 25%, the second grazing will be done by injecting water twice and turning the grain twice. If the moisture content of the raw materials is not less than 25%, the second grazing will be done by injecting water once and turning the grain twice. After the second grazing, if the moisture content of the raw materials is below 35%, the third grazing will be done by injecting water twice and turning the grain twice. If the moisture content of the raw materials is not less than 35%, the third grazing will be done by injecting water once and turning the grain twice.

4. The grain-moistening process for traditional sauce-flavored Baijiu production according to claim 3, characterized in that, The method of watering and turning the grain twice in one go includes the following steps: S1. Divide the raw materials required for a single batch of grain into N sub-piles, N≥2, and stack the sub-piles into a cone shape. Dig out a recessed water inlet at the top of the sub-piles. S2. Inject a portion of the water volume of the single grain rinsing into the water inlet of the first sub-pile and partially stir the first sub-pile; S3. While continuously stirring the first sub-pile, gradually inject the remaining water volume of the single grain rinsing until the entire water volume of the single grain rinsing is injected, and there is no obvious water overflow in the first sub-pile, and the water temperature is not lower than 95℃, thus completing one water injection. S4. After water injection is completed, the first sub-pile is subjected to two consecutive displacement stirrings to complete the two stirrings. Repeat the soaking steps S2-S4 for the remaining sub-piles until all N sub-piles have completed one water injection and two turnings, at which point one soaking is complete.

5. The grain-moistening process for traditional sauce-flavored liquor production according to claim 4, characterized in that: Both the first and second mixing processes involve full mixing, which includes the following steps: a. Push the raw materials around the cone-shaped grain pile and at the bottom into the water inlet until there is no obvious water overflow; b. Then carry out displacement and mixing. Displacement and mixing involves two people standing opposite each other on both sides of the grain pile and scattering the raw materials in the same direction in a fan shape. When shoveling the grain, the shovel should be close to the ground, and the two people should scatter the grain in a cross manner until the entire grain pile is moved to the next position. At the same time, the grain pile is shaped into a cone shape.

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