WO2014183313A1

WO2014183313A1 - Pretreatment method of tuber raw materials

Info

Publication number: WO2014183313A1
Application number: PCT/CN2013/077123
Authority: WO
Inventors: 张敏华; 余英哲; 耿中峰; 马静; 李桂明; 李永辉; 董秀芹; 吕惠生
Original assignee: 天津大学
Priority date: 2013-05-17
Filing date: 2013-06-11
Publication date: 2014-11-20
Also published as: CN103276021B; CN103276021A

Abstract

The present invention relates to a pretreatment method of tuber raw materials comprising: delivering tuber raw materials to a raw material sieving machine, and performing a sieving operation on the tuber raw materials to make the oversize materials be tuber blocks with impurities such as gravel having been removed; delivering the tuber blocks into a tuber block crusher to crush them, the undersize material being tuber powder enriching impurities such as gravel; mixing the tuber powder with a certain amount of water and liquefied enzymes in a primary liquefaction plant to perform a liquefaction operation so as to convert the starch in the tuber powder enriching impurities such as gravel into water-soluble reducing sugars such as glucose and polysaccharide; performing a solid-liquid separation on the liquefied mash obtained by the primary liquefaction operation to remove the mass of solid materials such as gravel and fibres in the liquefied mash; mixing the clear liquid discharged by the solid-liquid separation device with the tuber powder from the tuber block crusher; and performing a second liquefaction operation in a secondary liquefaction plant to obtain liquefied mash meeting the requirements of downstream production. This thoroughly solves the problems which occur when using tuber raw materials to produce biological products due to the presence of many impurities, for example, the production device can not run stably and efficiently for a long period, and problems of high energy consumption and material consumption.

Description

Potato raw material pretreatment method

The invention relates to a method for pretreating potato raw materials. The impurities in the raw materials of potato mainly include impurities such as sand and fiber, and excessive impurities affect the long-term, stable and efficient operation of the production equipment for producing bio-based products such as ethanol, butanol and organic acid from potato. The pretreatment method for sieving and removing impurities of the potato raw material proposed by the invention can effectively remove impurities such as sandstone and fiber in the raw material of the potato, thereby preparing a high solid content (solid content including soluble solid and insoluble solid) Liquefied hydrazine (referred to as liquefied hydrazine) solves the technical and engineering problems that plague the utilization of the potato raw material industry. Background technique

In recent years, the trend of technology development in the biological field worldwide, as well as the direction of China's energy and industrial restructuring policy, has become the consensus of the principle of "non-food-based" development of bio-based products and chemicals. As a basic raw material for the development of bio-based industries, glucose and polysaccharides are the basic raw materials for many pharmaceuticals and food, feed and fuel. As the global mineral resources are depleted, the renewable glucose as the basic raw material for the 21st century green chemical industry will become an ideal substitute for basic petrochemical raw materials. A large amount of low-cost glucose and polysaccharides are reduced. The key to product cost.

Glucose and polysaccharide production raw materials mainly include starch raw materials, saccharide raw materials, lignocellulose raw materials and the like. The raw material of potato is starchy raw material, mainly including cassava and sweet potato. The raw material of potato is prepared by pretreatment, liquefaction and saccharification of raw materials to prepare liquefied mash or mash containing glucose and polysaccharide, which can be used as raw material to produce glucose and polyglycol. Sugar and downstream bio-based products and chemicals, potato raw materials are one of the non-grain raw materials for the preparation of large-scale industrialization and economically feasible preparation of platform compounds such as glucose and polysaccharides.

The harvested fresh potato raw material is usually processed into potato pieces, dried in open air under the open conditions, and stored as dried potato chips for use as a raw material for potato. The raw materials of potato mainly refer to dried potato chips, the drying process of dried potato chips, and the packaging materials required for transportation and storage of raw materials. The raw materials of potato raw materials usually contain about 1%~10% of impurities such as sandstone and fiber, if not taken. Effective impurity removal measures will cause a large amount of impurities such as sand and fiber in the slurry of raw materials for potato raw materials. Excessive impurities in the raw materials will cause the raw materials to be blocked and abraded by the equipment and pipelines in the production process. The production equipment cannot be operated stably for a long period of time. The equipment and pipelines must be cleaned regularly, and the abrasives should be replaced frequently; If the production process is difficult to control, if the raw material is used to prepare liquefied mash, the solid content is low, for example, alcohol is produced, and it is difficult to achieve alcohol concentration fermentation. The volume concentration of mature sputum alcohol (commonly known as alcohol) is usually less than 10%. Fermentation operation, the volume concentration of alcohol in mature cockroaches (commonly known as alcohol) is usually greater than 12%, low alcohol content, mature 醪 preparation and subsequent processing energy consumption, high product quality, unstable product quality, urgent need to find effective means to achieve potato (also known as Dried potato) Effective pretreatment of the raw materials for sand removal and impurity removal. Summary of the invention

The raw material of the potato is also called the raw material of the potato. The raw material of the potato is usually in the form of a block. At the same time, the fine powder of about 5% to 30% by mass is contained, and impurities such as sandstone impurities having a mass ratio of more than 90% are mainly present in the raw material. In the fine powder of the raw material, the surface of the potato cake is also less contaminated. Impurities such as sand and gravel affect the production and utilization of potato raw materials, and the production equipment cannot be operated in a long period, stable and efficient manner. The traditional potato raw material utilization process, in order to remove impurities such as sand and gravel in the raw material of the potato, the raw material of the potato is usually pulverized, water is added to prepare the slurry, and the sand slurry is subjected to sedimentation or hydrocyclone separation. Removal of impurities, in order to improve the removal efficiency, it is necessary to reduce the viscosity of the slurry. Generally, the solid content concentration of the slurry is low, usually the total solid mass ratio is less than 20%, although the total solid mass ratio of the formulated slurry is less than 20%. However, the viscosity of the slurry is still relatively large, resulting in low removal rate of impurities such as sand and gravel contained in the slurry, usually less than 20%, and the content of starch in the impurities such as sand and stone removed is usually greater than 20% by mass. In the process, the starch loss is large, the slurry concentration is low, and the amount of the mixture water is large, which results in high utilization cost of the potato raw materials.

The invention relates to a pretreatment method for sieving and liquefying of potato raw materials, see the accompanying drawings: a flow chart of pretreatment methods for sieving, liquefaction, saccharification and washing of potato raw materials (Fig. 1); sieving pretreatment of sieving raw materials for potato raw materials Method flow chart (Fig. 2); Flow chart of potato raw material screening, liquefaction and saccharification pretreatment method (Fig. 3), as follows:

Special note: The data on the concentration and content of materials involved in this patent specification are all mass ratios unless otherwise specified.

First, the potato raw materials are air-selected, and the large pieces of impurities such as stones and iron blocks in the raw materials of the potato are removed, and the potato raw materials after the air selection are sent to the raw material screening machine, if there are no stones, iron pieces, etc. in the raw materials. Large pieces of sundries, the potato raw materials can be directly sent to the raw material screening machine without being subjected to air-selection operation, and the potato raw materials are sieved, and the sandstone impurities adhering to the surface of the potato cake are abraded and peeled off, potato chips and potatoes. The powder is separated, the sieve is the potato cake after sand removal, and the sieved potato powder is enriched with more than 90% of the sandstone and other impurities in the raw material, and the removed potato chips are sent to the potato chip crusher for crushing, and after crushing. The potato flour is sent to the potato powder sieving machine to remove impurities such as fibers, and the sifted potato powder is sent to the secondary liquefaction device. If the potato chip pulverizer obtains the potato powder, it contains less impurities such as fibers, and the pulverized potato powder It can be sent directly to the secondary liquefaction unit.

The raw material sieving machine is enriched with potato flour with impurities such as sand and gravel. The amount of potato powder is 5%~30% of the total material amount, mixed with the mixing water and liquefied enzyme, wherein the amount of the mixture water and the total amount of raw materials of the potato The mass ratio is less than or equal to 7/3, and the mass of the mixture water must satisfy the total solid content of the liquefied mash obtained by the secondary liquefaction device, which is greater than 30%. The total amount of raw materials of the potato is deducted from the amount of sandstone and other impurities. The total solid content includes soluble solids and insoluble solids. The liquefaction enzyme is an endonuclease. The main function is to divide long-chain starch into short-chain dextrin, which is convenient for the utilization of saccharification enzyme. The slurry is liquefied at a certain temperature. The starch in the potato flour enriched with impurities such as sand and gravel is converted into a polysaccharide such as dextrin dissolved in water, and a liquefied mash material is obtained, and the liquefied mash discharged from the primary liquefaction device is sent to the solid-liquid separator, and the solid-liquid separator is passed through the solid-liquid separator. In the separation operation, a large amount of solid materials such as sandstone and fibers contained in the liquefied niobium are removed. The slurry prepared by the process has a relatively large amount of the mixture of 5% to 30% of the total amount of the potato powder, and the total solid content of the slurry for sand removal is usually less than 10%, and the viscosity of the slurry is less than the total solid. The slurry with a concentration of 20% is further reduced by the liquefaction operation, and the viscosity of the liquefied niobium is further reduced by the liquid-solid separation operation, and all the impurities such as sand and gravel contained in the liquefied niobium are removed, and the removed solid materials such as sand and gravel are removed. The content of water and starch is low, and the content of starch and fermentable sugar in impurities such as sand and stone removed is usually more than 3%, and the concentration of secondary liquefied hydrazine controls the amount of mixing water of the liquefaction device.

The liquefied mash liquid obtained by the solid-liquid separator and the potato powder from the potato sieving machine to remove impurities such as fibers are sent to the secondary liquefaction device for secondary mixing, and a certain amount of liquefied enzyme may be added, and the liquefaction enzyme may be added at a certain temperature. The secondary liquefaction operation converts the starch in the added potato flour into a polysaccharide such as dextrin dissolved in water to obtain a liquefied mash which meets the downstream production requirements, and the total solid concentration in the liquefied mash obtained by the secondary liquefaction is realized. More than 30%, completely solve the problem of using potato raw materials to produce biological products. Due to more impurities, the production equipment can not be long-term, stable, efficient operation, large water consumption, high energy consumption and material consumption. In order to further reduce the viscosity of the liquefied mash, improve the solid-liquid separation efficiency, and reduce the loss of starch and fermentable sugar in the raw material, the liquefied mash obtained by the liquefaction operation may be added to the saccharification device to be liquefied in the liquefied mash. The polysaccharides such as starch and dextrin are converted into glucose, etc., the viscosity of the mashed mash sent by the saccharification device is lower than that of the liquefied mash, and the liquid-solid separation operation effect of the mash is good, and the starch remaining in the solid phase of the waste treatment system is reduced. The amount of reducing sugar such as dextrin increases the starch yield of the potato raw material. The saccharifying enzyme added in the saccharification operation is an exo-enzyme, and its main function is to convert the polysaccharides such as starch and dextrin in the liquefied mash into glucose. The mashing mash obtained by the saccharification operation is sent to the solid phase separator such as desilting solids in the solid-liquid separator, and the obtained mashing mash is mixed with the potato powder from the potato sifting machine, and the liquefied enzyme can be added twice at a certain temperature. The secondary liquefaction operation is carried out to convert the starch in the added potato flour into a polysaccharide such as dextrin dissolved in water, and obtain a mixture of liquefied mash or mash and liquefied mash which meets the downstream production requirements.

The concentration of total solids in the mixture of liquefied niobium or mash and liquefied niobium obtained by secondary liquefaction is more than 30%, and the total solid content includes soluble solids and insoluble solids.

The mash obtained by the liquefaction device or the saccharification device obtained by the liquefaction device is treated by a solid-liquid separator, and the removed solid phase material containing sand and gravel is washed with multi-stage water to recover residual starch and sugar in the solid phase. After the multi-stage water washing of the gravel-containing solid phase material, the residual starch and sugar content is less than 3%, and sent to the waste treatment system, and the washed and recovered water is returned to the liquefaction unit as the mixing water for recycling, if the solid-liquid separator is processed The discharged solid material containing sand and gravel is less, and the starch and reducing sugar are also less. The removed solid material containing sand and gravel can be directly sent to the waste treatment system without multi-stage water washing operation.

The operation range of the primary liquefaction unit and the secondary liquefaction unit is 30 to 140 °C. In order to improve the liquefaction efficiency of the potato raw material, when the liquefaction operation temperature of the primary liquefaction unit or the secondary liquefaction unit is less than 100 °C, the primary liquefaction unit and the secondary unit In order to reduce the production cost, the liquefaction operation of the liquefaction plant requires the addition of liquefaction enzymes. In addition, in order to reduce the production cost, the liquefaction operation temperature of the primary liquefaction device or the secondary liquefaction device is greater than or equal to 100 °C. The liquefaction process of the primary liquefaction unit and the secondary liquefaction unit does not add liquefaction enzyme.

The specific technical scheme and characteristics of a method for pretreating potato raw materials according to the present invention are as follows:

The potato raw material pretreatment method (see FIG. 2: flow chart of the potato raw material screening liquefaction pretreatment method), the potato raw material is sent to the raw material screening machine to sieve the raw materials; the sieved material is rich The potato powder with sand and gravel impurities is sent to the primary liquefaction device and mixed with the mixing water for liquefaction operation, and the liquefied mash discharged from the primary liquefaction device is sent to the solid-liquid separator, and the liquefied mash contains sand and gravel impurities. The solid phase material is removed, the liquefied mash liquid is sent to the secondary liquefaction device; the raw material sieve material is sent to the potato chip pulverizer for pulverization, and the potato powder discharged from the potato chip pulverizer is sent to the secondary liquefaction device, and the pulverized potato powder and The liquefied mash liquid obtained by the solid-liquid separator is mixed in a secondary liquefaction apparatus to perform a secondary liquefaction operation, and the secondary liquefaction apparatus discharges liquefied mash.

The potato raw material pretreatment method (see FIG. 1 : flow chart of potato raw material screening, liquefaction, saccharification and water washing pretreatment method), potato containing large pieces of stones and iron blocks The raw materials are sent to the raw material air sorting machine. The raw materials of the potato are removed from the large pieces of stones and iron in the raw materials through the air sorting machine, and the raw materials of the selected potato are sent to the raw material screening machine.

The potato raw material pretreatment method, the mass ratio of the mixing water amount to the total potato raw material amount is less than or equal to 7/3, and the quality of the mixing water is simultaneously satisfied with the liquefaction enthalpy or liquefaction obtained by the secondary liquefaction device. The total solid content of the mixture of strontium and mash is greater than 30%, the total amount of raw potato material is deducted from the amount of sandstone impurities in the raw material, and the total solid content in the mixture of liquefied mash or liquefied mash and mash The materials include soluble solids and insoluble solids. The potato raw material pretreatment method (see FIG. 1 : flow chart of potato raw material screening, liquefaction, saccharification and water washing pretreatment method), the raw material sieved by the raw material screening machine is sent to the potato The pulverizer is pulverized, and the potato powder discharged from the potato chip pulverizer is sent to the potato powder sieving machine to remove impurities such as fibers, and the liquefied mash liquid obtained by the potato powder screening machine and the solid-liquid separator is The secondary liquefaction apparatus mixes and performs a secondary liquefaction operation.

The potato raw material pretreatment method, the primary liquefaction device and the secondary liquefaction device operate at a temperature range of 30 to 140

°C, When the liquefaction operation temperature of the primary liquefaction unit or the secondary liquefaction unit is less than 100 °C, the liquefaction enzyme is added during the liquefaction operation.

The potato raw material pretreatment method, the primary liquefaction device is provided with a liquefaction tank, a liquefied hydrazine cooling device or a liquefied hydrazine heating device, when the temperature of the material in the primary liquefaction device is lower than the setting of the operating temperature of the primary liquefaction device When the value is turned on, the heating device of the primary liquefaction device is turned on to bring the operating temperature of the primary liquefaction device to a set value, and when the temperature of the material in the primary liquefaction device is higher than the set value of the operating temperature of the primary liquefaction device, the cooling of the liquefaction device is turned on. Equipment, reduce the operating temperature of the primary liquefaction device to the set value.

The pretreatment method for the potato raw material, the secondary liquefaction device is provided with a liquefaction tank, a liquefied hydrazine cooling device or a liquefied hydrazine heating device, wherein the temperature of the material in the secondary liquefaction device is lower than the operating temperature of the secondary liquefaction device When the set value is set, the heating device of the secondary liquefaction device is turned on to bring the operating temperature of the secondary liquefaction device to a set value, and when the temperature of the material in the secondary liquefaction device is higher than the set value of the operating temperature of the secondary liquefaction device , the cooling device of the secondary liquefaction device is turned on, and the operating temperature of the secondary liquefaction device is lowered to reach a set value.

The potato raw material pretreatment method (see FIG. 1 : flow chart of potato raw material screening, liquefaction, saccharification and water washing pretreatment method), solid phase material containing sandstone impurities discharged by solid-liquid separator It is sent to the starch recovery device, and the fermentable sugar such as starch, glucose and polysaccharide remaining in the solid phase is recovered by multi-stage water washing, and the washed solid phase containing the gravel and the fiber is sent to the waste disposal system. The rinse-recovered water discharged from the starch recovery device is sent as a mix water to the primary liquefaction device.

The potato raw material pretreatment method (see FIG. 3: flow chart of the potato raw material screening, liquefaction and saccharification pretreatment method), the liquefied hydrazine discharged from the primary liquefaction device is sent to the saccharification device for saccharification operation, and simultaneously The saccharification enzyme is added, and the mashed mash discharged from the saccharification device is sent to the solid-liquid separator to remove the solid phase material containing the sandstone impurities, and the saccharified mash liquid obtained by the solid-liquid separator and the potato powder sieve mash sieve are in the second The secondary liquefaction apparatus is mixed and subjected to a secondary liquefaction operation to obtain a liquefied mash and a mash mixture which removes sand and fiber impurities.

The potato raw material pretreatment method, the saccharification device is provided with a saccharification tank, a mashing device or a mashing heating device, and the saccharification device operates at a temperature ranging from 25 to 80 ° C, when the temperature of the material in the saccharification device is low When the operating temperature of the saccharification device is set, the mashing heating device that turns on the saccharification device increases the operating temperature of the saccharification device to a set value, when the temperature of the material in the saccharification device is higher than the set value of the operating temperature of the saccharification device. , the mashing device of the saccharification device is turned on, and the operating temperature of the saccharification device is lowered to reach a set value. DRAWINGS

Figure -1: Flow chart of the pretreatment method for screening, liquefaction, saccharification and washing of potato raw materials;

Figure -2: Flow chart of the pretreatment method for sieving of potato raw materials;

Figure-3: Flow chart of the pretreatment method for screening, liquefaction and saccharification of potato raw materials. detailed description

As shown in the figure (Fig. 1 : Flow chart of potato raw material screening, liquefaction, saccharification and water washing pretreatment method; Figure-2: Flow chart of potato raw material screening liquefaction pretreatment method; Figure-3: Potato raw material sieve The method for pretreatment of potato raw materials, as shown in the flow chart of the liquefaction and saccharification pretreatment method, is as follows:

The potato raw material is sent to the raw material air sorting machine, and the large pieces of debris such as stones and iron blocks in the raw material are removed by the potato raw material air sorting machine, and the removed large pieces of debris are sent to the waste disposal system, after the air selection The raw potato material is sent to the raw material screening machine.

If the potato raw material does not contain large pieces such as stones and iron, the raw materials of the potato can be directly sent to the raw material screening machine. The raw materials of the potato are usually mixed with impurities such as sandstone and fiber in the range of 1% to 10%. More than 90% of impurities such as sand and gravel are less than 2 mm. The form of the raw material of the potato is in the form of a block and a powder. The raw material sieving machine may be a screening device in the form of a vibrating screen or a trommel sieve. The sieving material of the raw material sieving machine is a potato powder rich in impurities such as sand and gravel, and the sifting material is usually It accounts for about 2% to 30% of the total amount of raw materials of potato, and the content of impurities such as sand and gravel in the sieve material is more than 90% of the total amount of impurities such as sand and gravel contained in the raw material of the potato, and the amount of the potato powder under the sieve The content of impurities such as sand and gravel is related to the amount of impurities such as sand and gravel in the raw material, the pore size of the screening device, the vibration intensity of the sieve, and the abrasion strength between the materials. Most of the long fiber impurities contained in the raw material are present in the raw material of the sieve. The raw material sieve is sent to the potato chip crusher.

The potato powder discharged from the potato chip shredder is sent to the potato powder screening machine to remove impurities such as fibers, and the impurities such as fibers are removed and sent to the waste treatment system, and the sieved potato powder is sent to the secondary liquefaction device, if the potato pieces are crushed. The impurities such as fibers contained in the potato flour discharged from the machine do not affect the subsequent production and processing, and the potato flour can be directly sent to the secondary liquefaction device without passing through the potato powder screening machine.

The raw material sieved by the raw material screening machine is collected and sent to a liquefaction device and mixed with water, and liquefied enzyme is added for liquefaction operation, wherein the mass ratio of the mixture water amount to the total amount of the raw material of the potato is less than or equal to 7/3. The mixing water quantity must satisfy the total solid content concentration in the liquefied niobium obtained by the secondary liquefaction device to be greater than 30%, and the total amount of the raw material of the potato is deducted from the mass of the sand and the like, and the total solid content in the liquefied niobium includes the soluble solid. And the insoluble solids, the total solid concentration of the slurry is less than 10%, and the mixing water is added in the sum of the flushing water and the mixing water directly sent to the primary liquefaction device.

Through liquefaction operation in a liquefaction apparatus, most of the starch in the potato powder in the sieve is converted into glucose and polysaccharide dissolved in water to prepare liquefied mash, and the liquefied mash prepared by the primary liquefaction device can be directly sent. The solid-phase separator can remove the solid phase impurities such as sand and gravel, and can also be sent to the saccharification device for further saccharification and viscosity reduction, and then sent to the solid-liquid separator to remove solid phase impurities such as sand and gravel.

The primary liquefaction device is equipped with a liquefaction tank, a liquefied hydrazine cooling or a liquefied hydrazine heating device, and the primary liquefaction device is configured to select a liquefied hydrazine cooling device or a liquefied hydrazine heating device according to a specific pretreatment process, and is controlled once by a liquefied hydrazine cooling device or a heating device. The operating temperature of the material in the liquefaction device, the operating temperature of the primary liquefaction device is 30 to 1401, and when the liquefaction temperature is less than 100 °C, the liquefaction enzyme is added during the liquefaction operation.

The liquefied hydrazine from a liquefaction device rich in solid materials such as sandstone and fiber is sent to a solid-liquid separator to remove solid phase materials mainly containing impurities such as sand and gravel, and the solid phase mainly containing impurities such as sand and gravel is sent to the starch. The recovery device recovers the fermentable sugars such as starch, glucose and polysaccharide remaining in the solid phase by water multi-stage rinsing, and the solid phase mainly containing impurities such as sand and fiber after washing is sent to the waste treatment system, and the starch The rinse-recovered water discharged from the recovery unit is sent as a mix water to the primary liquefaction unit. The liquefied mash liquid obtained by the solid-liquid separator is mixed with the potato powder from the potato chip pulverizer or the potato powder sieving machine to remove impurities such as fibers, and a certain amount of liquefied enzyme is added, and the second liquefaction operation is performed at a certain temperature to obtain Liquefied mash that meets downstream production requirements.

The secondary liquefaction device is equipped with a liquefaction tank, a liquefied hydrazine cooling device or a liquefied hydrazine heating device, and the secondary liquefaction device is configured to configure a liquefied hydrazine cooling device or a liquefied hydrazine heating device according to a specific pretreatment process, through a liquefied hydrazine cooling device or liquefaction. The 醪 heating device controls the operating temperature of the material in the secondary liquefaction device, the total solid content in the liquefied mash or the mixture of mash and liquefied mash obtained by secondary liquefaction is greater than 30%, and the operating temperature range of the secondary liquefaction device is 30 ~140 ° C, when the liquefaction temperature is less than 100 ° C, in order to improve the liquefaction effect, the liquefaction process requires the addition of liquefaction enzyme.

In addition, in order to further reduce the viscosity of the solid-liquid separator feed, improve the efficiency of the solid-liquid separator, and reduce the loss of reducing sugar such as sugar and starch, the liquefied hydrazine discharged from the primary liquefaction unit may not be directly sent to the solid-liquid separator. First, it is sent to the saccharification device, and the saccharification device is simultaneously added with saccharification enzyme to further saccharify the liquefied mash discharged from the liquefaction device to lower the viscosity, and the mashed mash discharged from the saccharification device is sent to the solid-liquid separator to remove the solid phase, and the sand is contained. The solid phase of impurities such as stone can be directly discharged to the waste treatment system or sent to the starch recovery unit. The residual solid starch and sugar content of the solid phase containing sand and gravel in the starch recovery unit after washing by multiple stages of water is less than 3%. .

The saccharification device is provided with a saccharification tank, a mashing device or a mashing device, and the saccharification device is configured to configure a mashing device or a mashing device according to a specific pretreatment process, and the saccharification device is controlled by a mashing device or a heating device. The operating temperature of the medium material, the saccharification operation temperature ranges from 25 to 80 °C.

The mash solution obtained from the pulverizer or the potato sifter under the sieve and the solid-liquid separator is sent to the secondary liquefaction device, and mixed in the secondary liquefaction device to perform the secondary liquefaction operation, and the liquefaction enzyme is controlled according to the liquefaction operation temperature. The addition of liquefied mash and mash mash to remove impurities such as sand and fiber to meet downstream production requirements. Example 1:

Taking cassava as raw material, the starch content of cassava dry raw material is 69%. The process is shown in Figure-2: The flow chart of the slag liquefaction pretreatment method for potato raw materials realizes the effective removal of impurities such as sandstone and fiber from the raw materials of cassava. except.

The dried cassava raw materials are directly sent to the raw material sieving machine, and the dried cassava raw materials sent to the raw material sieving machine are mixed with impurities such as sandstone and fiber with a mass ratio of 1%. The raw material sieving machine is a vibrating sieve, and the raw material sieving machine is rich in sand. Potato powder with impurities such as stone, the amount of potato flour under the sieve accounts for about 10% of the total mass ratio of the raw materials of the potato, and the content of impurities such as sand and gravel in the sieve is 95% or more of the total mass ratio of impurities such as sand and gravel contained in the raw material. The potato cake on the sieve is sent to the potato chip pulverizer, and the potato powder discharged from the potato chip pulverizer is sent to the secondary liquefaction device.

The sifter powder of the raw material screening machine is collected and sent to a liquefaction device and mixed with the mixing water. The temperature of the mixing water is normal temperature, and the mass concentration of the total solid content of the slurry is far less than 10%, and is added by a liquefaction device. The mass concentration of the total solid content of the liquefied niobium sent by the secondary liquefaction apparatus was 32%. The liquefied mash is prepared by converting the starch in the potato powder into glucose and polysaccharide dissolved in water by a liquefaction operation in a liquefaction apparatus, and the liquefied hydrazine prepared by the primary liquefaction apparatus is directly sent to the solid-liquid separator, and the liquefaction is performed once. The liquefaction operating temperature in the apparatus was 140 °C.

Since the mixing water is at a normal temperature, when the feeding temperature of the slurry entering the primary liquefaction device is lower than the operating temperature of the material in the primary liquefaction device, the heating device of the liquefaction device needs to be turned on to make the operating temperature of the material in the primary liquefaction device Stable at 140 °C. The liquefied hydrazine discharged from the primary liquefaction unit is sent to a solid-liquid separator to remove solid phase substances mainly containing impurities such as sand and gravel, and the solid phase mainly containing impurities such as sand and gravel is directly sent to the waste treatment system, and the removed sand-containing stone is removed. The mass ratio of starch and sugar in the solid phase is less than 3%.

The liquefied mash liquid obtained by the solid-liquid separator is mixed with the potato powder from the potato chip pulverizer for secondary liquefaction operation to obtain liquefied mash which meets the downstream production requirements, and the operating temperature setting value of the secondary liquefaction device is 100 ° C. The mass ratio of the total solid content of the liquefied niobium sent out by the secondary liquefaction apparatus was 32%.

The removal rate of impurities such as sandstone and fiber in the liquefied mash from the cassava dry material is 95% by mass, so that the production equipment using the liquefied hydrazine to produce downstream products can be operated for a long period of time, stably and efficiently. . Example 2:

Taking cassava as raw material, the starch content of cassava dry raw material is 68%. Refer to Figure-1 for the process of screening, liquefaction, saccharification and washing pretreatment of potato raw materials to realize sandstone and fiber impurities in dried cassava raw materials. Effective removal.

The cassava raw material is sent to the raw material air sorting machine, and the wind source of the air sorting machine is air. The large amount of debris such as stones and iron blocks in the raw material is removed by the cassava raw material air sorting machine, and the removed large pieces of debris are sent to the The waste treatment system, the cassava raw material after the air separation, is sent to the raw material screening machine.

The cassava raw material sent to the raw material sieving machine is mixed with impurities such as sandstone and fiber with a mass ratio of 10%. The cassava raw material sieving machine is a screening device in the form of a vibrating sieve, and the raw material sieving machine sifting material accounts for 30% of the total mass ratio of the cassava raw material. The content of impurities such as sand and gravel in the sieve is 95% or more of the total mass ratio of impurities such as sand and gravel contained in the raw material, and the potato cake on the sieve is sent to the potato chip crusher.

Since the potato powder discharged from the potato chip shredder contains less impurities such as fibers and does not affect subsequent processing and utilization, the potato powder is directly sent to the secondary liquefaction device.

The raw material screening machine is collected and sent to a liquefaction device and mixed with water. The mass concentration of the total solid content of the slurry is less than 10%. At the same time, liquefaction is added to liquefy the operation. The liquefaction temperature is 90 °C. The total amount of the mixture water is controlled to control the mass concentration of the total solid content of the liquefied niobium sent by the secondary liquefaction device to 30%, and the starch in the potato powder in the sieve is converted into water by the liquefaction operation in the primary liquefaction device. The liquefied hydrazine prepared by the primary liquefaction device can be directly sent to the solid-liquid separator.

Since the mixing water is at a normal temperature, when the feeding temperature of the slurry entering the primary liquefaction device is lower than the operating temperature of the material in the primary liquefaction device by 90 ° C, it is necessary to open the heating device of the liquefaction device to make the operating temperature of the material in the primary liquefaction device Stable at 90 °C.

The liquefied hydrazine discharged from the primary liquefaction unit is not sent directly to the solid-liquid separator, but is sent to the saccharification unit at the same time, and saccharification enzyme is added at the same time, the saccharification operation temperature is 58 ° C, and the mashed mash discharged from the saccharification device is sent to the solid-liquid separator. In addition to the solid phase, the solid phase containing impurities such as sand and gravel is also sent to the starch recovery device, and the fermentable sugar such as starch, glucose and polysaccharide remaining in the solid phase is recovered by multistage washing of water. The solid phase of impurities such as sand and fiber is sent to the waste treatment system, and the rinsed water discharged from the starch recovery device is sent as a mixture water to the primary liquefaction device, and the operating temperature of the saccharification device is controlled by the mashing device.

Since the temperature of the liquefied niobium material discharged from the primary liquefaction unit is 90 ° C, which is higher than the operating temperature of the material in the saccharification unit of 58 ° C, the mashing device of the saccharification device needs to be turned on, so that the operating temperature of the material in the saccharification device is stably maintained at 58°. C. The mashing solution obtained by the potato sieving sieve under the sieve and the solid-liquid separator is sent to the secondary liquefaction device, and mixed in the secondary liquefaction device for secondary liquefaction operation, and the liquefaction enzyme is added, and the operating temperature of the secondary liquefaction device is added. At 80 ° C, a mixture of liquefied mash and mash having an impurity such as sand and fiber is obtained, and the total solid mass ratio of the mash and the liquefied mash mixture fed from the secondary liquefaction device reaches 30%.

Since the feed of the secondary liquefaction device is a mixture of the mashed mash and the potato powder, the feed temperature is lower than the operation temperature of the secondary liquefaction device, and the heating device of the secondary liquefaction device needs to be turned on to make the material in the secondary liquefaction device The operating temperature is stable at 80 °C.

The removal rate of impurities such as sandstone and fiber in the mixture of mash and liquefied mash obtained by sieving and liquefaction is 95% of the mass ratio, and the removed solid phase of the sand-containing solid phase is washed with water. The residual content of the reducing sugar such as starch and sugar is less than 2%. Example 3:

Taking cassava as raw material, the content ratio of starch of cassava dry raw material is 68%. Refer to Figure-1 for the process of screening, liquefaction, saccharification and washing pretreatment of potato raw materials to realize the sand in the raw material of cassava. Effective removal of impurities such as stone and fiber.

The cassava raw material sent to the raw material sieving machine is mixed with impurities such as sandstone and fiber with a mass ratio of 5%. The cassava raw material screening machine is a screening device in the form of a trommel sieve, and the raw material sieving sieve sifting material accounts for 20% of the total mass ratio of the cassava raw material. The content of impurities such as sand and gravel in the sieve is 92% or more of the total mass ratio of impurities such as sand and gravel contained in the raw material, and the potato cake on the sieve is sent to the potato chip crusher.

The potato powder discharged from the potato chip shredder is first sent to the potato powder screening machine to remove impurities such as fibers, and impurities such as sieve fibers are removed and sent to the waste treatment system, and the sieved potato powder is sent to the secondary liquefaction device.

The raw material sieving machine is collected and sent to a liquefaction device and mixed with water, and liquefied enzyme is added for liquefaction operation. The total slag content of the liquefied sputum is controlled by the total amount of the mixture water. For 30%, the temperature of the mixing water is 40 °C, and the liquefied hydrazine prepared by the primary liquefaction unit can be directly sent to the solid-liquid separator, and the liquefaction temperature is 30 °C.

Since the temperature of the mixing water is 40 °C, the slurry feeding temperature of the primary liquefaction device is higher than the operating temperature of the material in the primary liquefaction device by 30 °C, and the cooling device of the liquefaction device needs to be turned on to make the material in the primary liquefaction device The operating temperature is stable at 30 °C.

The liquefied hydrazine discharged from the primary liquefaction unit is not sent directly to the solid-liquid separator, but is sent to the saccharification unit first, and the saccharification enzyme is added at the same time. The mashed mash discharged from the saccharification device is sent to the solid-liquid separator to remove the solid phase, and the gravel is contained. The solid phase such as impurities is also sent to the starch recovery device, and the fermentable sugar such as starch, glucose and polysaccharide remaining in the solid phase is recovered by multistage washing, and the impurities such as sandstone and fiber are washed after washing. The phase is sent to the waste treatment system, and the rinsed water discharged from the starch recovery device is sent as a mixing water to the primary liquefaction device, and the operating temperature of the saccharification device is controlled by the mashing device, and the saccharification operation temperature is 80 °C. Since the feed of the saccharification device is the liquefaction enthalpy discharged from the primary liquefaction device, the temperature of the liquefied mash material is 30 ° C, which is lower than the operating temperature of the material in the saccharification device by 80 ° C, and the mashing heating device of the saccharification device needs to be turned on to make the saccharification device The operating temperature was stably maintained at 80 °C.

The mashed mash liquid obtained from the sieve of the potato powder sifter and the solid-liquid separator is sent to the secondary liquefaction device, mixed in the secondary liquefaction device for secondary liquefaction operation, and the liquefied enzyme is added to obtain the sand removal fiber and the fiber. The liquefied mash and the mashing mash mixture of the impurities, the operating temperature of the secondary liquefaction device is 90 ° C, and the total solid content of the mash and the liquefied mash mixture fed from the secondary liquefaction device can reach 30% by mass.

Since the feed of the secondary liquefaction device is a mixture of the mashed mash and the potato powder, the feed temperature is lower than the operation temperature of the material in the secondary liquefaction device, and the heating device of the secondary liquefaction device needs to be turned on to make the secondary liquefaction device The operating temperature was stably maintained at 90 °C.

The removal rate of impurities such as sandstone and fiber in the mixture of mash and liquefied mash obtained by sieving and liquefaction is 92% of the mass ratio, and the removed solid phase of the gravel-containing solid phase is washed after multi-stage water. The residual starch and sugar have a mass ratio of less than 2%. Example 4:

Taking cassava as raw material, the mass ratio of starch content of cassava dry raw materials is 68%. Refer to Figure-1 for the process of screening, liquefaction, saccharification and washing pretreatment of potato raw materials to realize the sand in the raw materials of cassava. Effective removal of impurities such as stone and fiber.

The cassava raw material is sent to the raw material air sorting machine, and the large pieces such as stones and iron blocks in the raw materials are removed by the cassava raw material air sorting machine, and the removed large pieces of debris are sent to the waste disposal system, and the cassava after the air selection The raw materials are then sent to the raw material screening machine.

The cassava raw material sent to the raw material sieving machine is mixed with impurities such as sandstone and fiber with a mass ratio of 3%. The cassava raw material screening machine is a screening device in the form of a trommel sieve, and the raw material sieving sieve sifting material accounts for 15% of the total mass ratio of the cassava raw material. The content of impurities such as sand and gravel in the sieve is 91% or more of the total mass ratio of impurities such as sand and gravel contained in the raw material, and the potato cake on the sieve is sent to the potato chip crusher.

The raw material screening machine is collected and sent to a liquefaction device and mixed with water for liquefaction operation. The total solid content of the slurry is less than 10%, and the total amount of the mixed water is controlled by the secondary liquefaction device. The solid content concentration is estimated to be 33%, and the liquefied hydrazine prepared by the primary liquefaction device is converted into glucose and polysaccharide dissolved in water by liquefaction operation in a primary liquefaction device. It can be sent directly to the solid-liquid separator with a single liquefaction temperature of 100 °C.

Since the mixing water is at a normal temperature, when the feeding temperature of the slurry entering the primary liquefaction device is lower than the operating temperature of the material in the primary liquefaction device, the heating device of the liquefaction device needs to be turned on to stably maintain the operating temperature of the primary liquefaction device. At 100 °c.

The liquefied hydrazine discharged from the primary liquefaction unit is sent directly to the solid-liquid separator, and the solid phase containing impurities such as sand and gravel is also sent to the starch recovery device, and the starch, glucose and polycondensation remaining in the solid phase are recovered by multistage washing of water. Fermentable sugar such as sugar, after rinsing The solid phase containing impurities such as sand and fiber is sent to the waste treatment system, and the rinsed water discharged from the starch recovery device is sent as a mixture water to the primary liquefaction device.

The liquefied mash liquid obtained from the sieve of the potato powder sifter and the solid-liquid separator is sent to the secondary liquefaction device, and mixed in the secondary liquefaction device for secondary liquefaction operation, and the liquefaction enzyme is added to obtain the sand removal and The liquefaction enthalpy of impurities such as fibers, the operating temperature of the secondary liquefaction apparatus is 30 ° C, and the total solid content mass ratio of the mash and the liquefied mash mixture fed from the secondary liquefaction apparatus can reach 33%.

Since the secondary liquefaction device feeds the mixture of the liquefied mash liquid and the potato powder, the material temperature is higher than the operation temperature of the material in the secondary liquefaction device, and the cooling device of the secondary liquefaction device needs to be opened to operate the secondary liquefaction device. The temperature was stable at 30 °C.

The removal rate of impurities such as sandstone and fiber in the liquefied mash material obtained by sieving and liquefaction is 91% of the mass ratio, and the residual starch after washing the multi-stage water of the solid phase containing the gravel and the removed 5%。 The mass ratio of the sugar content is less than 1. 5%. Example 5

Taking sweet potato as raw material, the starch content of sweet potato dry raw material is 64% by mass. The process is shown in Figure-1: Flow chart of potato raw material screening, liquefaction, saccharification and water washing pretreatment method to realize sandstone and dry sweet potato raw materials. Effective removal of impurities such as fibers.

The sweet potato raw material (also known as dried potato raw material) is sent to the raw material air sorting machine, and the large pieces such as stones and iron blocks in the raw material are removed by the sweet potato raw material air sorting machine, and the removed large pieces of debris are sent to the waste. The treatment system, the sweet potato raw material after the air selection is sent to the raw material screening machine.

The sweet potato raw material sent to the raw material screening machine is mixed with impurities such as sandstone and fiber with a mass ratio of 5%, the sweet potato raw material screening machine is a screening device in the form of a trommel sieve, and the raw material screening machine under the sieve has a total mass ratio of sweet potato raw materials. %, the content of impurities such as sand and gravel in the sieve is 95% or more of the total mass ratio of impurities such as sand and gravel contained in the raw material, and the potato cake on the sieve is sent to the potato chip mill.

After the raw material sieving machine is collected, it is sent to a liquefaction device and mixed with the mixing water. The total solid content of the slurry is less than the mass concentration.

10%, at the same time adding liquefaction enzymes for liquefaction operation, controlling the total solid content of liquefied niobium sent by the secondary liquefaction device by the total amount of the mixture water to be 33% by mass, by liquefaction operation in a liquefaction device, sieve The starch in the potato powder in the lower material is converted into water-soluble glucose, polysaccharide, etc., and the primary liquefaction operation temperature is 95 °C.

Since the mixing water is at a normal temperature, when the feeding temperature of the slurry entering the primary liquefaction device is lower than the operating temperature of the material in the primary liquefaction device, the heating device of the liquefaction device needs to be turned on to stably maintain the operating temperature of the primary liquefaction device. At 95 °C.

The liquefied mash discharged from the primary liquefaction device is sent to the saccharification device, and the saccharification enzyme is added, and the mashed mash discharged from the saccharification device is sent to the solid-liquid separator to remove the solid phase, and the solid phase containing impurities such as sand and gravel is also sent to the starch recovery device. The fermentable sugar such as starch, glucose and polysaccharide remaining in the solid phase is recovered by multistage washing, and the washed solid phase containing impurities such as sandstone and fiber is sent to the waste treatment system, and the starch recovery device discharges The rinse-recovered water is sent as a mix water to the primary liquefaction unit, and the operating temperature of the saccharification unit is controlled by the mashing device, and the saccharification operation temperature is 58 °C. Since the feed of the saccharification device is the liquefied mash discharged from the liquefaction device, the temperature of the liquefied mash material is 95 ° C, which is higher than the operating temperature of the material in the saccharification device by 58 ° C, and the mashing device for opening the saccharification device is required to open the saccharification device. The operating temperature was stably maintained at 58 °C.

The mashed mash obtained from the sieve of the potato powder sifter and the solid-liquid separator is fed to the secondary liquefaction device, and mixed in the secondary liquefaction device to perform secondary liquefaction operation, thereby obtaining liquefaction for removing impurities such as sandstone and fibers. The mixing temperature of the mash and the mashing mash, the operating temperature of the secondary liquefaction device is 100 ° C, and the total solid content of the mash and the liquefied mash mixture fed from the secondary liquefaction device can reach 33% by mass.

Since the feed of the secondary liquefaction device is a mixture of the mashed mash and the potato powder, the material temperature is lower than the operation temperature of the material in the secondary liquefaction device, and the heating device of the secondary liquefaction device needs to be turned on to operate the secondary liquefaction device. The temperature is stable at 100 °C.

The removal rate of impurities such as sandstone and fiber in the mixture of mash and liquefied mash obtained by sieving and liquefaction of fresh sweet potato raw materials is 95% by mass ratio, and the removed solid phase of sand-containing solid phase is washed with water. After the residual starch and sugar content is less than 1% by mass.

Example 6:

Taking the tapioca as raw material, the starch content of the raw material is 67% by mass. The process is shown in Figure-3: Flow chart of the screening, liquefaction and saccharification process of potato raw materials to realize the effective removal of impurities such as sandstone and fiber from cassava raw materials. except.

The cassava dry raw material is sent to the raw material sieving machine, and the cassava raw material sent to the raw material sieving machine is mixed with impurities such as sandstone and fiber with a mass ratio of 6%. The cassava raw material sieving machine is a screening device in the form of a trommel sieve, and the raw material sieving machine is sieved under the sieve. The content of the total mass ratio of cassava raw materials is 12%, and the content of impurities such as sand and gravel in the sieve is more than 95% of the total mass ratio of sandstone and other impurities contained in the raw material, and the potato cake on the sieve is sent to the potato chip crusher. The potato powder discharged from the potato chip shredder is sent to the secondary liquefaction device.

After the raw material screening machine is collected, it is sent to a liquefaction device and mixed with water. The total solid content of the slurry is less than 10%. At the same time, liquefaction enzyme is added to carry out the liquefaction operation, and the secondary liquefaction is controlled by the total amount of the mixture water. The total solid content of the liquefied niobium sent by the device is 33% by mass, and the starch in the potato powder in the sieve is converted into glucose and polysaccharide dissolved in water by liquefaction operation in a primary liquefaction device. The liquefaction operating temperature was 85 °C.

Since the mixing water is at a normal temperature, when the slurry feeding temperature of the primary liquefaction device is lower than the operating temperature of the material in the primary liquefaction device by 85 ° C, the heating device of the liquefaction device needs to be turned on to stably maintain the operating temperature of the primary liquefaction device. At 85 °C.

The liquefied mash discharged from the primary liquefaction device is sent to the saccharification device, and the saccharification enzyme is added. The mashed mash discharged from the saccharification device is sent to the solid-liquid separator to remove the solid phase, and the solid phase containing impurities such as sand and gravel is sent to the waste treatment system. The saccharification operating temperature setting was 56 °C.

Since the feed of the saccharification device is the liquefaction enthalpy discharged from the primary liquefaction device, the temperature of the liquefied mash material is 85 ° C, which is higher than the operating temperature of the material in the saccharification device by 56 ° C, and the mashing device for opening the saccharification device is required to open the saccharification device. The operating temperature was stably maintained at 56 °C.

The mashing solution obtained by the potato powder screening machine and the solid-liquid separator is sent to the secondary liquefaction device, and mixed in the secondary liquefaction device for secondary liquefaction operation to obtain impurities such as sand and fiber. Liquefied mash and mash mixture, The operating temperature of the secondary liquefaction apparatus is 100 ° C, and the total solid content of the mash and the liquefied mash mixture fed from the secondary liquefaction apparatus can reach a mass ratio of 33%.

Since the feed of the secondary liquefaction device is a mixture of the mashed mash and the potato powder, the material temperature is lower than the operation temperature of the material in the secondary liquefaction device, and the heating device of the secondary liquefaction device needs to be turned on to operate the secondary liquefaction device. Temperature stability is maintained at

100 °c.

The removal rate of impurities such as sandstone and fiber in the mixture of mash and liquefied mash obtained by sieving, liquefaction, saccharification, etc. is 96% of the mass ratio of the removed solid content of the gravel-containing solid phase. 2%。 The starch and sugar content is less than the mass ratio of 1.2%.

The technical solutions disclosed and proposed by the present invention can be implemented by those skilled in the art by appropriately changing the raw materials, process parameters, structural design and the like by referring to the contents of the present invention.

Claims

Claim

A method for pretreating potato raw materials, characterized in that the raw materials of potato are fed into a raw material screening machine to sieve the raw materials; the undersize is a potato powder enriched with sand and gravel impurities, and the raw material is sent to a liquefaction. The device is mixed with the mixing water to perform the liquefaction operation, and the liquefied mash discharged from the primary liquefaction device is sent to the solid-liquid separator, the solid phase material containing the sandstone impurities in the liquefied mash is removed, and the liquefied mash liquid is sent to the secondary liquefaction device; The raw material sieve is sent to the potato chip pulverizer for pulverization, and the potato powder discharged from the potato chip pulverizer is sent to the secondary liquefaction device, and the pulverized potato powder and the liquefied mash liquid obtained by the solid-liquid separator are mixed in the secondary liquefaction device. A secondary liquefaction operation is performed, and the secondary liquefaction device discharges the liquefied mash.

2. A method for pretreating potato raw material according to claim 1, characterized in that the raw material of the potato containing a large mass of stones and iron pieces is sent to a raw material air sorting machine, and the raw materials of the potato are selected by air. The machine removes the large pieces of stones and iron in the raw materials, and the air-selected potato raw materials are sent to the raw material screening machine.

3. The method for pretreating potato raw material according to claim 1, wherein the mass ratio of the amount of the mixing water to the total amount of the raw material of the potato is less than or equal to 7/3, and the quality of the mixing water is simultaneously satisfied. The mass concentration of the total solid content in the liquefied niobium or the liquefied niobium and the mash mixture obtained by the secondary liquefaction device is more than 30%, and the total amount of the raw material of the potato is deducted from the amount of sandstone impurities in the raw material, liquefied niobium or liquefied niobium and The total solids in the mashing mixture include soluble solids and insoluble solids.

4. A method for pretreating potato raw materials according to claim 1, wherein the raw material sieves discharged from the raw material screening machine are sent to a potato chip shredder for pulverization, and the potato powder discharged from the potato chip shredder is fed. The potato powder screening machine removes the fibrous inclusions, and the potato powder sieve and the liquefied mash liquid obtained by the solid-liquid separator are mixed in the secondary liquefaction device for secondary liquefaction operation.

5. The method for pretreating potato raw material according to claim 1, wherein the primary liquefaction device and the secondary liquefaction device are operated at a temperature ranging from 30 to 140 ° C, when the liquefaction device or the secondary liquefaction device is liquefied. When the operating temperature is less than 100 ° C, liquefaction enzyme is added during the liquefaction operation.

6. The method for pretreating potato raw material according to claim 1, wherein the primary liquefaction device is provided with a liquefaction tank, a liquefied hydrazine cooling device or a liquefied hydrazine heating device, wherein the temperature of the material in the primary liquefaction device is lower than When the operating temperature of the primary liquefaction device is set, the heating device of the primary liquefaction device is turned on to bring the operating temperature of the primary liquefaction device to a set value, and the temperature of the material in the primary liquefaction device is higher than the operating temperature of the primary liquefaction device. At the time of the value, the cooling device of the liquefaction device is turned on, and the operating temperature of the primary liquefaction device is lowered to reach the set value.

7. The method for pretreating potato raw material according to claim 1, wherein the secondary liquefaction device is provided with a liquefaction tank, a liquefied hydrazine cooling device or a liquefied hydrazine heating device, and a temperature of the material in the secondary liquefaction device. When the setting value of the operating temperature of the secondary liquefaction device is lower than the set value of the operating temperature of the secondary liquefaction device, the heating device of the secondary liquefaction device is turned on to bring the operating temperature of the secondary liquefaction device to a set value, and when the temperature of the material in the secondary liquefaction device is higher than the secondary liquefaction When the operating temperature of the device is set, the cooling device of the secondary liquefaction device is turned on, and the operating temperature of the secondary liquefaction device is lowered to reach the set value.

8. The method for pretreating potato raw material according to claim 1, wherein the solid phase material containing sand and gravel impurities discharged from the solid-liquid separator is sent to a starch recovery device, and the residue is recovered by multistage washing of water. The fermentable sugar such as starch, glucose and polysaccharide in the phase, the solid phase containing the gravel and the fiber after washing is sent to the waste treatment system, and the rinsed water discharged from the starch recovery device is fed as the mixing water once. Liquefaction unit.

9. The method for pretreating potato raw material according to claim 1, wherein the liquefied mash discharged from the primary liquefaction device is sent to a saccharification device for saccharification operation, and a saccharification enzyme is added, and the mashed mash discharged from the saccharification device is sent to the solid. The liquid separator removes the solid phase material containing the sandstone impurities, and the saccharified mash liquid obtained by the solid-liquid separator and the potato powder sieve mash sieve material are mixed in the secondary liquefaction device to perform secondary liquefaction operation, and the liquefaction operation is obtained. Liquefied mash and mash mixture of sand and fiber impurities.

The method for pretreating potato raw materials according to claim 9, wherein the saccharification device is provided with a saccharification tank, a mashing device or a mashing device, and the saccharification device has an operating temperature range of 25 to 80 ° C. When the temperature of the material in the saccharification device is lower than the set value of the operating temperature of the saccharification device, the mashing heating device that turns on the saccharification device increases the operating temperature of the saccharification device to a set value, and the temperature of the material in the saccharification device is higher than the saccharification When the operating temperature of the device is set, the mashing device of the saccharification device is turned on, and the operating temperature of the saccharifying device is lowered to a set value.