Biorefinery system

Abstract

The utility model provides a bio-refinery system and relates to the technical field of lignocellulose. The biorefinery system comprises a pretreatment unit, a biotransformation unit, an extraction unit and at least one of an incineration heat supply unit and a wastewater recovery unit. According to the incineration heat supply unit, internal energy generated by combustion of the lignin residues with the high calorific value can serve as solid fuel, the cost of original materials of energy is saved, recycling of the lignin residues is achieved, environmental pollution can be reduced, and the environmental protection property is good. According to the wastewater recovery unit of the bio-refinery system provided by the utility model, a wastewater evaporation treatment process is combined with various bio-fermentation and bio-refining processes, so that production wastewater can be recycled to the bio-refinery process after being treated, water consumption and wastewater discharge in the bio-refinery process are greatly reduced, efficient cyclic utilization of water is realized, and sustainability is improved. In addition, internal energy generated by combustion of the high-calorific-value lignin residues is used as solid fuel, and the wastewater treatment and recycling process can be completed at low energy consumption.

Description

Technical Field

[0001] The utility model generally relates to the technical field of lignocellulose, and in particular to a biorefining system. Background Art

[0002] In the biorefining process, dry biorefining is used. After the pretreatment and bioconversion stages, wastewater and lignin residues will be generated. Since the address of the biorefining plant is generally close to the biomass production area, that is, rural areas, and mainly consists of scattered small and medium-sized biorefining plants. Under this model, the cost of treating wastewater and lignin residues in the biorefining plant is relatively high, resulting in relatively high overall production costs. In addition, the direct discharge of wastewater and lignin residues will also cause energy waste, which does not take into account the needs of energy conservation and environmental protection. Utility Model Content

[0003] The utility model provides a biorefining system with high recycling efficiency and good environmental protection.

[0004] According to one aspect of the utility model, a biorefinery system is provided, comprising:

[0005] A pretreatment unit, used for pretreatment of raw materials;

[0006] A bioconversion unit, connected to the pretreatment unit, for performing bioconversion on the pretreated raw material to form fermentation mash;

[0007] an extraction unit, connected to the bioconversion unit, for extracting a finished product and lignin residue from the fermented mash;

[0008] The biorefinery system further comprises at least one of an incineration heat supply unit and a wastewater recovery unit, the inlet of the incineration heat supply unit is connected to the extraction unit, the incineration heat supply unit is used to incinerate the lignin residue and generate a heat source, and the outlet of the incineration heat supply unit is connected to at least one of the pretreatment unit, the bioconversion unit, the extraction unit and the wastewater recovery unit;

[0009] The inlet of the wastewater recovery unit is connected to the extraction unit, and the wastewater recovery unit is used to evaporate the wastewater generated by the extraction unit to form steam and condensed water.

[0010] In some of the embodiments, the inlet of the wastewater recovery unit is connected to the extraction unit.

[0011] In some embodiments, the biorefinery system further comprises a wastewater recovery unit, which is used to evaporate the wastewater generated by the extraction unit to form steam and condensed water.

[0012] In some of the embodiments, the outlet of the incineration heat supply unit is connected to the wastewater recovery unit to provide the heat source for the wastewater recovery unit.

[0013] In some of the embodiments, the outlet of the wastewater recovery unit is connected to at least one of the pretreatment unit, the biological transformation unit and the extraction unit, and the wastewater recovery unit is capable of delivering the steam to the pretreatment unit and delivering the condensed water to at least one of the pretreatment unit, the biological transformation unit and the extraction unit.

[0014] In some embodiments, the extraction unit comprises:

[0015] A solid-liquid separation device, connected to the bioconversion unit, for separating the solid and liquid of the fermented mash to form the lignin residue and the filtrate containing the finished product;

[0016] The decolorization equipment is connected to the solid-liquid separation equipment and is used for decolorizing the filtrate to form a decolorized clear liquid containing the finished product.

[0017] In some embodiments, the extraction unit further comprises:

[0018] A concentration device, the inlet of which is connected to the decolorization device, is used to evaporate and concentrate the decolorized clear liquid to form a condensate and a concentrated liquid. The incineration heating unit is connected to the concentration device to provide a heat source for the concentration device.

[0019] In some embodiments, the concentration device is connected to at least one of the biological conversion unit and the extraction unit, and the condensate formed by the concentration device can be transported to the biological conversion unit and the extraction unit.

[0020] In some embodiments, the extraction unit further comprises:

[0021] The crystallization device is connected with the decolorization device or the concentration device and is used for crystallizing the decolorized clear liquid or the concentrated liquid to form crystals.

[0022] In some embodiments, the extraction unit further comprises:

[0023] The acidification device is connected to the crystallization device and is used for acidifying the crystals to form a crude product, such as a crude lactic acid product.

[0024] In some embodiments, the extraction unit further comprises:

[0025] An ion exchange resin column is connected to the acidification equipment and is used for adsorbing water and metal ions in the crude product acid to obtain a purified product.

[0026] In some embodiments, the ion exchange resin column is connected to a wastewater recovery unit, and the wastewater adsorbed by the ion exchange resin column can be transported to the wastewater recovery unit.

[0027] In some embodiments, the pre-processing unit comprises:

[0028] A pretreatment tank, wherein the pretreatment tank is provided with a feed port, a steam inlet and an exhaust port, the feed port is used to introduce the raw material, and the steam inlet is connected to the wastewater recovery unit;

[0029] The first stirring device is arranged in the pretreatment tank and is used for stirring the raw material.

[0030] In some embodiments, the bioconversion unit comprises:

[0031] a saccharification tank, connected to the pretreatment unit;

[0032] a fermentation tank, respectively connected to the saccharification tank and the extraction unit;

[0033] A detoxification tank, arranged between the saccharification tank and the fermentation tank or between the saccharification tank and the pretreatment unit;

[0034] The second stirring device is arranged inside at least one of the saccharification tank, the fermentation tank and the detoxification tank.

[0035] In some embodiments, the incineration heat supply unit is connected to at least one of the saccharification tank, the fermentation tank and the detoxification tank.

[0036] In some embodiments, the biorefinery further comprises:

[0037] A drying box, the inlet of which is connected to the extraction unit, is used for drying the lignin residue.

[0038] An embodiment of the utility model has the following advantages or beneficial effects:

[0039] 1. The biorefining system provided by the utility model can incinerate the lignin residues produced by the extraction unit by using the incineration heat supply unit, and the heat source generated by the incineration can provide the required energy for at least one of the pretreatment unit, the bioconversion unit and the extraction unit. The internal energy generated by the combustion of the high calorific value lignin residues can be used as solid fuel, saving the cost of energy raw materials, and realizing the recycling of lignin residues, which can reduce environmental pollution and has good environmental protection.

[0040] 2. The biorefining system provided by the utility model combines the wastewater evaporation treatment process with various bio-fermentation biorefining processes, and can reuse the production wastewater after treatment in the biorefining process, greatly reducing the water consumption and wastewater discharge in the biorefining process, achieving efficient recycling of water, and improving sustainability. In addition, the internal energy generated by the combustion of high calorific value lignin residues as solid fuel can complete the wastewater treatment and reuse process at a lower energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to better understand the utility model, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the utility model. In addition, related elements or components may have different settings as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each of the drawings. By describing its example embodiments in detail with reference to the drawings, the above and other features and advantages of the utility model will become more apparent.

[0042] in:

[0043] Figure 1 Shown is a schematic structural diagram of a biorefining system according to an embodiment of the utility model;

[0044] Figure 2 It shows a schematic diagram of the structure of a pretreatment tank in a biorefining system according to an embodiment of the utility model;

[0045] Figure 3 It shows a schematic diagram of the structure of a bioconversion unit in a biorefining system according to an embodiment of the utility model;

[0046] Figure 4 The figure shows the structure of the extraction unit in the biorefining system of one embodiment of the utility model. Figure 1 ;

[0047] Figure 5 The figure shows the structure of the extraction unit in the biorefining system of one embodiment of the utility model. Figure 2 .

[0048] The reference numerals are described as follows:

[0049] 1. Pretreatment unit; 2. Bioconversion unit; 3. Extraction unit; 4. Incineration heating unit; 5. Wastewater recovery unit;

[0050] 11. pretreatment tank; 111. feed port; 112. steam inlet; 113. exhaust port; 12. first stirring device;

[0051] 21. Saccharification tank; 22. Fermentation tank; 23. Detoxification tank;

[0052] 31. solid-liquid separation equipment; 311. first solid-liquid separation equipment; 312. second solid-liquid separation equipment; 313. third solid-liquid separation equipment;

[0053] 32. Decolorization equipment; 33. Concentration equipment; 34. Crystallization equipment; 35. Acidification equipment; 36. Ion exchange resin column. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the example embodiments of the utility model to clearly and completely describe the technical solutions in the example embodiments of the utility model. The example embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the utility model. Therefore, it should be understood that various modifications and changes can be made to the example embodiments without departing from the scope of protection of the utility model.

[0055] In the description of the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0056] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0057] Further, in the description of the present invention, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present invention are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present invention. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", or "inner", "outer", but can also be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0058] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0059] This embodiment provides a biorefining system, such as Figure 1 As shown, the biorefinery system includes a pretreatment unit 1, a bioconversion unit 2, an extraction unit 3 and an incineration heating unit 4. The pretreatment unit 1 is used to pretreat the raw material, and the bioconversion unit 2 is connected to the pretreatment unit 1 and is used to perform bioconversion on the pretreated raw material to form fermented mash. The extraction unit 3 is connected to the bioconversion unit 2 and is used to extract the finished product and lignin residue from the fermented mash.

[0060] The raw materials specifically refer to lignocellulosic raw materials, for example, agricultural and forestry wastes and solid wastes rich in cellulose, and agricultural and forestry wastes include but are not limited to one or more of corn straw, wheat straw, rice straw, cotton straw, Jerusalem artichoke, sesame stalk, rape straw, corn cob, rice husk, rice husk, peanut shell, sweet sorghum stalk, bagasse, sawdust, waste paper, switchgrass, jatropha seed shell, hardwood, and softwood. The raw materials can be selected from one or a combination of agricultural and forestry wastes and solid wastes rich in cellulose, and the sources of the raw materials are relatively wide.

[0061] The fermented mash contains lignin residue and finished products to be extracted and separated. Bioconversion includes but is not limited to saccharification, detoxification and fermentation processes. The lignocellulosic raw material forms fermented mash after saccharification, detoxification and fermentation processes. The fermented mash is, for example, ethanol fermented mash, lactic acid fermented mash, amino acid fermented mash, citric acid fermented mash, sugar acid fermented mash, etc.

[0062] Among them, after the fermented mash is passed into the extraction unit 3, the extraction unit 3 extracts the fermented mash. The extraction process of the extraction unit 3 includes but is not limited to a solid-liquid separation process to obtain a solid lignin residue and a solution containing the finished product. The solution containing the finished product can specifically be a clear liquid of the fermentation product, a lactic acid fermentation liquid, etc.

[0063] The existing biorefining system will directly discard the lignin residue, which pollutes the environment, and because the lignin residue has a certain combustion value, it will cause energy waste.

[0064] To solve this problem, Figure 1As shown, the biorefining system provided in this embodiment also includes an incineration heat supply unit 4, the inlet of the incineration heat supply unit 4 is connected to the extraction unit 3, the incineration heat supply unit 4 is used to incinerate lignin residue and generate a heat source, and the outlet of the incineration heat supply unit 4 is connected to at least one of the pretreatment unit 1, the biological conversion unit 2 and the extraction unit 3.

[0065] Among them, the outlet of the incineration heat supply unit 4 can be connected to only any one of the pretreatment unit 1, the biological transformation unit 2 and the extraction unit 3, and the incineration heat supply unit 4 provides the required heat source for these three units respectively; the outlet of the incineration heat supply unit 4 can also be connected to two or three of the pretreatment unit 1, the biological transformation unit 2 and the extraction unit 3, and the incineration heat supply unit 4 provides the required heat source for two or all of the units respectively.

[0066] In the biorefining system provided in this embodiment, the incineration heat supply unit 4 can incinerate the lignin residue generated by the extraction unit 3, and the heat source generated by the incineration provides the required energy for at least one of the pretreatment unit 1, the bioconversion unit 2 and the extraction unit 3. The internal energy generated by the combustion of the high calorific value lignin residue can be used as solid fuel, saving the cost of energy raw materials, and realizing the recycling of lignin residue, which can reduce environmental pollution and has good environmental protection.

[0067] In one embodiment, Figure 1-Figure 2 As shown, the pretreatment unit 1 comprises a pretreatment tank 11, and the pretreatment tank 11 is provided with a feed inlet 111, a steam inlet 112 and an exhaust port 113, and the feed inlet 111 is used for introducing raw materials.

[0068] Specifically, wheat straw is added into the pretreatment tank 11 through the feed port 111 of the pretreatment tank 11, and dilute sulfuric acid with a mass fraction of 3.5% w / w is added into the pretreatment tank 11, so that the solid-liquid ratio in the pretreatment tank 11 is 2:1 (w / w). Then, 1.6MPa, 200°C steam is introduced through the steam inlet 112 of the pretreatment tank 11 to perform dry dilute acid pretreatment, and finally the pH value of the pretreated wheat straw is adjusted to 4.8-5.0. The exhaust port 113 of the pretreatment tank 11 is used to discharge the waste gas or excess steam generated during the pretreatment process.

[0069] In one embodiment, Figure 1-Figure 2 As shown, the pretreatment unit 1 further includes a first stirring device 12, which is disposed in the pretreatment tank 11 and is used to stir the raw materials. The first stirring device 12 can be used to fully mix the raw materials, dilute sulfuric acid and steam in the pretreatment tank 11 to improve the pretreatment effect.

[0070] Among them, the first stirring device 12 can be a manual stirring rod or a mechanical stirring device installed in the pretreatment tank 11. The mechanical stirring device includes a stirring drive source, a stirring paddle and a stirring shaft. The stirring drive source can be a motor or a motor and a magnetic steel transmission magnetic stirring structure. The output end of the stirring drive source is connected to the stirring shaft. The stirring drive source drives the stirring shaft to rotate. The stirring paddle is fixed on the stirring shaft and / or the bottom of the stirring shaft through a support rod. As the stirring shaft rotates, the stirring shaft drives the stirring paddle to rotate, thereby improving the sufficiency and thoroughness of the mixing of cellulose, dilute sulfuric acid and steam in the pretreatment tank 11, saving labor costs and improving production efficiency.

[0071] In one embodiment, Figure 3 As shown, the bioconversion unit 2 includes a saccharification tank 21 , a fermentation tank 22 and a detoxification tank 23 , and the saccharification tank 21 is connected to the pretreatment unit 1 .

[0072] The temperature in the saccharification tank 21 is about 50°C or below, cellulase and water are placed in the saccharification tank 21, the solid content in the saccharification tank 21 is about 30%, and the pretreated raw materials are introduced into the saccharification tank 21 for enzymatic saccharification reaction to form saccharified liquid.

[0073] In one embodiment, the bioconversion unit 2 further includes a detoxification tank 23 , and the saccharification tank 21 is connected to the detoxification tank 23 .

[0074] Among them, the temperature in the detoxification tank 23 is about 37°C, the saccharified liquid after enzymatic hydrolysis in the saccharification tank 21 is transported to the detoxification tank 23, the seed liquid of the biological detoxification strain resin spore mold is inoculated into the detoxification tank 23, and the detoxification treatment is carried out under normal pressure, 37°C and ventilation conditions to form a detoxified saccharified liquid.

[0075] In one embodiment, Figure 3 As shown, the bioconversion unit 2 further includes a fermentation tank 22, and the fermentation tank 22 is connected to the saccharification tank 21 and the extraction unit 3 respectively.

[0076] Specifically, after the detoxified saccharified liquid is transported to the fermentation tank 22, the seed liquid of lactic acid bacteria and nutrient salts are added to the fermentation tank 22, wherein the inoculation amount of the seed liquid of lactic acid bacteria is 10% (v / v), and the nutrient salt components include but are not limited to 10g / L peptone, 10g / L yeast extract, 2g / L diammonium hydrogen citrate and 0.25g / L manganese sulfate monohydrate, and the temperature in the fermentation tank 22 is controlled to be about 42°C to perform simultaneous saccharification and fermentation to form a fermentation mash containing lactate. During the fermentation process, calcium hydroxide is used as a neutralizer to maintain the pH value of the fermentation system at about 5.5.

[0077] Among them, the detoxification tank 23 provided in the present invention is arranged between the saccharification tank 21 and the fermentation tank 22, that is, the detoxification tank 23 can also be arranged after the saccharification tank 21, and the position of the detoxification tank 23 is not completely fixed. The detoxification tank 23 can also be arranged between the saccharification tank 21 and the pretreatment unit 1, that is, the detoxification tank 23 can also be arranged before the saccharification tank 21.

[0078] It can be understood that the incineration heating unit 4 is connected to at least one of the saccharification tank 21, the fermentation tank 22 and the detoxification tank 23. Specifically, the heat generated by the incineration heating unit 4 can provide the required heat source for the saccharification tank 21, so that the saccharification tank 21 performs enzymatic saccharification reaction at a temperature below 50°C and above the normal room temperature. The heat generated by the incineration heating unit 4 can provide the required heat source for the detoxification tank 23, so that the detoxification tank 23 performs detoxification at a temperature of about 37°C, and the heat generated by the incineration heating unit 4 can provide the required heat source for the fermentation tank 22, so that the fermentation tank 22 performs synchronous saccharification and fermentation at a temperature of about 42°C.

[0079] In one embodiment, the bioconversion unit 2 further includes a second stirring device (not shown in the figure), which is disposed inside at least one of the saccharification tank 21 , the fermentation tank 22 and the detoxification tank 23 .

[0080] Among them, the second stirring device can be a manual stirring rod, or it can be a mechanical stirring device installed in one of the saccharification tank 21, the fermentation tank 22 and the detoxification tank 23. The mechanical stirring device includes a stirring drive source, a stirring paddle and a stirring shaft. The stirring drive source can be a motor or a motor and a magnetic steel transmission magnetic stirring structure. The output end of the stirring drive source is connected to the stirring shaft, and the stirring drive source drives the stirring shaft to rotate. The stirring paddle is fixed on the stirring shaft and / or the bottom end of the stirring shaft through a support rod. As the stirring shaft rotates, the stirring shaft drives the stirring paddle to rotate, thereby improving the sufficiency and thoroughness of the mixing of materials in the saccharification tank 21, the fermentation tank 22 and the detoxification tank 23, etc., and saving labor costs and improving production efficiency.

[0081] In one embodiment, Figure 1 As shown, the biorefining system also includes a wastewater recovery unit 5, the inlet of which is connected to the extraction unit 3. The wastewater recovery unit 5 is used to evaporate the wastewater generated by the extraction unit 3 to form steam and condensed water, which can also be called fresh water.

[0082] Specifically, the wastewater recovery unit 5 includes an evaporation device and a condensation device. For example, the evaporation device may be an evaporator, and the condensation device may be a condenser. The evaporation device is used to evaporate the wastewater to form steam, and the condensation device is used to condense the evaporated steam to form condensed water. Under the action of the evaporation device and the condensation device, the wastewater undergoes evaporation and condensation processes to obtain steam and condensed water.

[0083] The outlet of the incineration heating unit 4 is connected to the wastewater recovery unit 5, which is used to provide a heat source for the wastewater recovery unit 5. Since the evaporation equipment of the wastewater recovery unit 5 needs to work under heating conditions, the heat generated by the incineration heating unit 4 is used to provide the required heat source for the evaporation equipment, thereby reducing the demand for external heat sources of the wastewater recovery unit 5, reducing production costs, realizing resource recycling, and having good sustainable effects.

[0084] In one embodiment, Figure 1 As shown, the outlet of the wastewater recovery unit 5 is connected to at least one of the pretreatment unit 1, the biological transformation unit 2 and the extraction unit 3, so that the steam and / or condensed water generated by the wastewater recovery unit 5 flows back to any one, two or three of the pretreatment unit 1, the biological transformation unit 2 and the extraction unit 3, thereby realizing the reuse of wastewater and reducing the consumption of new water input. After the wastewater is treated by the wastewater recovery unit 5, only a very small amount of high-salt wastewater remains and enters the subsequent wastewater treatment system.

[0085] Among them, the wastewater recovery unit 5 can deliver steam to the pretreatment unit 1. Specifically, the evaporation equipment of the wastewater recovery unit 5 is connected to the steam inlet 112 of the pretreatment unit 1 through a steam pipeline to provide the required steam to the pretreatment unit 1, reduce the demand of the pretreatment unit 1 for external steam, and reduce production costs. At the same time, the wastewater recovery unit 5 can deliver condensed water to at least one of the pretreatment unit 1, the biological conversion unit 2 and the extraction unit 3 to provide the solvent of the required solution for these processes, reduce the demand for external water, reduce production costs, and achieve recycling, with good environmental protection and sustainability.

[0086] The wastewater recovery unit 5 provided in the present disclosure can almost completely convert wastewater into steam and condensed water, thereby reducing environmental pollution. The wastewater recovery unit 5 is connected to at least one of the pretreatment unit 1, the biological conversion unit 2 and the extraction unit 3, so that the wastewater evaporation treatment process is combined with various biological fermentation and biorefining processes to improve sustainability and minimize fresh water demand and wastewater discharge. For example, the fresh water input is reduced by 67% to 85%, and the wastewater generation is reduced by 64% to 89%.

[0087] In one embodiment, Figure 4 As shown, the extraction unit 3 includes a solid-liquid separation device 31, which is connected to the biological conversion unit 2 and is used for performing solid-liquid separation on the fermented mash to form lignin residue and a filtrate containing the finished product.

[0088] Among them, the solid-liquid separation equipment 31 can specifically select a plate-frame filter press, a centrifuge, etc., for example, a plate-frame filter press. During operation, the fermented mash produced by the bioconversion unit 2 enters the solid-liquid separation equipment 31 of the extraction unit 3, and the solid-liquid separation equipment 31 is used to separate the fermented mash into solid and liquid to obtain wet solid filter residue and filtrate. The main component of the wet solid filter residue is lignin residue, which has a high calorific value and a water content of about 60%. The filtrate is a fermentation clear liquid, which can be further separated and purified to obtain a finished product. The lignin residue can be transported to the incineration heating unit 4 as a fuel for incineration and heating.

[0089] In one embodiment, Figure 4 As shown, the extraction unit 3 also includes a decolorization device 32, which is connected to the solid-liquid separation device 31 and is used to decolorize the filtrate to obtain a decolorized clear liquid containing a finished product (such as calcium salt of lactic acid).

[0090] The decolorizing device 32 may be a decolorizing tank or a decolorizing column. 2% to 3% activated carbon may be added to the decolorizing tank for decolorization, so that the fermentation clear liquid is decolorized by the decolorizing device 32, and then the decolorized liquid mixed with a large amount of activated carbon is filtered through a solid-liquid separation device 31 such as a plate-frame filter press to remove the activated carbon, and a relatively clean decolorized clear liquid can be obtained.

[0091] In one embodiment, Figure 5 As shown, the extraction unit 3 also includes a concentration device 33, the inlet of the concentration device 33 is connected to the decolorization device 32, and is used to evaporate and concentrate the decolorized clear liquid to form a condensate and a concentrated liquid. The incineration heat supply unit 4 is connected to the concentration device 33 and is used to provide a heat source for the concentration device 33. The wastewater recovery unit 5 is connected to the concentration device 33, and the concentration device 33 is used to transport the condensate to the wastewater recovery unit 5.

[0092] Among them, the concentration device 33 can be an evaporator, such as a double-effect evaporator. The decolorized clear liquid after decolorization by the decolorization device 32 is transported to the concentration device 33 for evaporation and concentration. The incineration and heating unit 4 is connected to the concentration device 33. The heat required by the concentration device 33 comes from the heat generated by the combustion of lignin residue in the incineration and heating unit 4, which reduces the demand of the concentration device 33 for external heat sources, reduces production costs, and improves the recycling rate, which is sustainable. At the same time, the condensate generated by evaporation of the concentration device 33 enters the wastewater recovery unit 5, and is further recycled through the evaporation and condensation process of the wastewater recovery unit 5.

[0093] Among them, the concentration device 33 is connected to at least one of the biological transformation unit 2 and the extraction unit 3. The concentration device 33 can transport the formed condensate to the biological transformation unit 2 and the extraction unit 3, that is, the condensate formed by the concentration device 33 can be directly used as the water required by the biological transformation unit 2 and the extraction unit 3, thereby improving the recycling rate.

[0094] In one embodiment, Figure 5 As shown, the extraction unit 3 further includes a crystallization device 34, which is connected to the decolorization device 32 or the concentration device 33 and is used to crystallize the decolorized clear liquid or the concentrated liquid to form crystals.

[0095] Among them, the crystallization device 34 can select a crystallization tank, and the decolorized clear liquid after decolorization treatment by the decolorization device 32 or the concentrated liquid after evaporation and concentration by the concentration device 33 is transported to the crystallization device 34, and the crystals are formed after cooling treatment by the crystallization device 34. At this time, the crystals and mother liquor containing the finished product can be obtained after filtering by the solid-liquid separation device 31. For example, the main component of the crystals is the calcium salt of lactic acid, which can be further acidified by the acidification device and purified by other impurity removal treatment equipment to obtain lactic acid. The crystallization device 34 is connected to the wastewater recovery unit 5, and the mother liquor can be further recycled after entering the wastewater recovery unit 5.

[0096] It can be understood that the concentration device 33 is optional, that is, the decolorized clear liquid can be crystallized only by the crystallization device 34, or the decolorized clear liquid can be evaporated and concentrated by the concentration device 33 and then crystallized by the crystallization device 34. The concentration process and the crystallization process can be adjusted according to actual production needs, and this embodiment is not limited thereto.

[0097] In one embodiment, Figure 5 As shown, the extraction unit 3 further comprises an acidification device 35, which is connected to the crystallization device 34 and is used for acidifying the crystals to form a crude product, such as crude lactic acid.

[0098] The acidification device 35 may be an acidification tank. After the crystals, such as calcium lactate crystals, are transported to the acidification device 35 after being crystallized by the crystallization device 34, 50% (v / v) sulfuric acid is added to the acidification device 35 for acid hydrolysis to separate and obtain a crude product.

[0099] In one embodiment, Figure 5 As shown, the extraction unit 3 further includes an ion exchange resin column 36, which is connected to the acidification device 35. The ion exchange resin column 36 is used to adsorb water and metal ions in a crude product such as crude lactic acid to obtain a purified product.

[0100] Specifically, after the crude lactic acid passes through the ion exchange resin column 36, the ion exchange resin column 36 can adsorb water and a small amount of metal ions in the crude lactic acid, thereby obtaining a lactic acid product with a mass fraction of more than 85%.

[0101] Meanwhile, the ion exchange resin column 36 is connected to the waste water recovery unit 5 , so that the water adsorbed by the ion exchange resin column 36 can be transported to the waste water recovery unit 5 , and the waste water recovery unit 5 recycles the adsorbed water.

[0102] In addition, according to the actual needs of the user, after the adsorption treatment by the ion exchange resin column 36, the solution containing the finished product discharged can be further concentrated by the concentration device 33 to achieve the purpose of concentrating the product.

[0103] It should be noted that the incineration heating unit 4 has a heating priority order for each unit or device: wastewater recovery unit 5, concentration equipment 33 and other equipment. Among them, the concentration equipment 33 includes a concentration equipment 33 that can be arranged before or after the decolorization equipment 32, and a concentration equipment 33 that is arranged before or after the ion exchange resin column 36. If the heat generated by the incineration heating unit 4 can completely cover the heat required by the wastewater recovery unit 5, the concentration equipment 33 and other units or equipment, then only the incineration heating unit 4 can be used for energy supply; if the heat generated by the incineration heating unit 4 cannot completely cover the heat required by these units or equipment, then the insufficient part can be supplemented by other heating equipment.

[0104] After the fermentation mash is formed by bioconversion in the bioconversion unit 2, the fermentation mash can be heated to a certain temperature, such as 80°C, to inactivate the bacteria and cellulase in the fermentation mash and terminate the fermentation. The insoluble solids in the fermentation mash aggregate to form larger particles and sink, reducing the viscosity of the fermentation mash, thereby facilitating the subsequent solid-liquid separation operation. Since the solids in the fermentation mash agglomerate at high temperature, it is convenient for the solid-liquid separation device 31 to filter and improve the filtering effect.

[0105] In one embodiment, the fermentation tank 22 in the bioconversion unit 2 is equipped with a heating device, which can heat the fermented mash to a certain temperature, such as 80° C. That is, the fermented mash formed by bioconversion is heated to about 80° C. in the fermentation tank 22 and then filtered through the solid-liquid separation device 31 .

[0106] In one embodiment, the extraction unit 3 further includes a heating device (not shown in the figure), such as a storage tank with a heating function or a heat exchanger, and the heating device is arranged between the bioconversion unit 2 and the solid-liquid separation device 31. The heating device can heat the fermented mash to a certain temperature, such as 80°C, and then filter it through the solid-liquid separation device 31.

[0107] It should be noted that the number of solid-liquid separation devices 31 of the extraction unit 3 can be one. In the extraction process, as long as the solid-liquid separation step is required, the same solid-liquid separation device 31 is used for solid-liquid separation. The number of solid-liquid separation devices 31 of the extraction unit 3 can also be multiple. For example, the three solid-liquid separation devices 31 can be the first solid-liquid separation device 311, the second solid-liquid separation device 312 and the third solid-liquid separation device 313. The first solid-liquid separation device 311 is arranged before the decolorization device 32, the second solid-liquid separation device 312 is arranged between the decolorization device 32 and the concentration device 33, and the third solid-liquid separation device 313 is arranged between the crystallization device 34 and the acidification device 35. Of course, this embodiment does not limit the number and the location of the solid-liquid separation devices 31, and can be adjusted according to actual production conditions.

[0108] It should be particularly noted that the heat exchanger, concentration equipment 33, crystallization equipment 34, acidification equipment 35, etc. provided in the extraction unit 3 of the present disclosure are not necessarily necessary components of the extraction unit 3, and their quantity and type can be adjusted according to the composition of the raw materials, the type of fermentation mash obtained by bioconversion, the process of extracting the finished product by fermentation, the cost and actual production needs.

[0109] In one embodiment, the biorefining system includes a drying box (not shown in the figure), the inlet of which is connected to the extraction unit 3 for drying the lignin residue.

[0110] Since the lignin residue will carry a certain amount of moisture after solid-liquid separation by the solid-liquid separation device 31, the lignin residue is placed in a drying box and dried to a suitable moisture content, for example, within 10%, so that the lignin residue can be subsequently entered into the incineration heating unit 4 for incineration treatment. The internal energy generated by the incineration treatment is used as a heat source to provide energy for the evaporation equipment of the wastewater recovery unit 5 to heat the wastewater. After heating the wastewater, hot steam is formed, and the hot steam provides the required steam for the pretreatment tank 11. If there is residual steam, the residual steam can be passed through the condensation equipment of the wastewater recovery unit 5 to form clean condensed water, which is circulated to the front-end pretreatment tank 11, saccharification tank 21, detoxification tank 23, and fermentation tank 22 as raw water for production, for example, used for the preparation of acid catalyst solution, etc.

[0111] It should be understood that what is shown in the drawings and described in this specification is only an example of the principle of the present invention. A person skilled in the art should clearly understand that the principle of the present invention is not limited to any details or any components of the device shown in the drawings or described in the specification.

[0112] It should be understood that the utility model does not limit its application to the detailed structure and arrangement of the components proposed in this specification. The utility model can have other embodiments and can be implemented and executed in a variety of ways. The aforementioned deformation forms and modified forms fall within the scope of the utility model. It should be understood that the utility model disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned or evident in the text and / or the drawings. All these different combinations constitute multiple alternative aspects of the utility model. The embodiments described in this specification illustrate the best known methods for implementing the utility model and will enable those skilled in the art to utilize the utility model.

[0113] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variation, use, or adaptation of the present invention, which follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and example embodiments are to be considered as exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.

[0114] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. A biorefining system, characterized in that: include: A pretreatment unit, used for pretreatment of raw materials; A bioconversion unit, connected to the pretreatment unit, for performing bioconversion on the pretreated raw material to form fermentation mash; an extraction unit, connected to the bioconversion unit, for extracting a finished product and lignin residue from the fermented mash; The biorefinery system further comprises at least one of an incineration heat supply unit and a wastewater recovery unit, the inlet of the incineration heat supply unit is connected to the extraction unit, the incineration heat supply unit is used to incinerate the lignin residue and generate a heat source, and the outlet of the incineration heat supply unit is connected to at least one of the pretreatment unit, the bioconversion unit and the extraction unit; The inlet of the wastewater recovery unit is connected to the extraction unit, and the wastewater recovery unit is used to evaporate the wastewater generated by the extraction unit to form steam and condensed water.

2. The biorefining system according to claim 1, characterized in that The outlet of the incineration heat supply unit is connected to the wastewater recovery unit, and is used to provide the heat source for the wastewater recovery unit.

3. The biorefining system according to claim 2, characterized in that The outlet of the wastewater recovery unit is connected to at least one of the pretreatment unit, the biological transformation unit and the extraction unit, and the wastewater recovery unit can transport the steam to the pretreatment unit and transport the condensed water to at least one of the pretreatment unit, the biological transformation unit and the extraction unit.

4. The biorefining system according to claim 2, characterized in that The extraction unit comprises: A solid-liquid separation device, connected to the bioconversion unit, for separating the solid and liquid of the fermented mash to form the lignin residue and the filtrate containing the finished product; The decolorization equipment is connected to the solid-liquid separation equipment and is used for decolorizing the filtrate to form a decolorized clear liquid containing the finished product.

5. The biorefining system according to claim 4, characterized in that The extraction unit also includes: A concentration device, the inlet of which is connected to the decolorization device, and is used to evaporate and concentrate the decolorized clear liquid to form a condensate and a concentrated liquid. The incineration heat supply unit is connected to the concentration device and is used to provide a heat source for the concentration device; And / or, the concentration device is connected to at least one of the biological conversion unit and the extraction unit, and the concentration device can transport the formed condensate to the biological conversion unit and the extraction unit.

6. The biorefining system according to claim 5, characterized in that The extraction unit also includes: The crystallization device is connected with the decolorization device or the concentration device and is used for crystallizing the decolorized clear liquid or the concentrated liquid to form crystals.

7. The biorefining system according to claim 6, characterized in that The extraction unit also includes: The acidification device is connected to the crystallization device and is used for acidification treatment of the crystals to form a crude product.

8. The biorefining system according to claim 7, characterized in that The extraction unit also includes: an ion exchange resin column, connected to the acidification device, and used for adsorbing water and metal ions in the crude product to obtain a purified product; And / or, the ion exchange resin column is connected to the wastewater recovery unit, and the water adsorbed by the ion exchange resin column can be transported to the wastewater recovery unit.

9. The biorefining system according to claim 2, characterized in that: The pre-processing unit comprises: A pretreatment tank, wherein the pretreatment tank is provided with a feed port, a steam inlet and an exhaust port, the feed port is used to introduce the raw material, and the steam inlet is connected to the wastewater recovery unit; The first stirring device is arranged in the pretreatment tank and is used for stirring the raw material.

10. The biorefining system according to any one of claims 1 to 9, characterized in that: The bioconversion unit comprises: a saccharification tank, connected to the pretreatment unit; a fermentation tank, respectively connected to the saccharification tank and the extraction unit; A detoxification tank, arranged between the saccharification tank and the fermentation tank or between the saccharification tank and the pretreatment unit; A second stirring device is disposed inside at least one of the saccharification tank, the fermentation tank, and the detoxification tank; And / or, the incineration heat supply unit is connected to at least one of the saccharification tank, the fermentation tank and the detoxification tank.

11. The biorefining system according to any one of claims 1 to 9, characterized in that The biorefinery system also includes: A drying box, the inlet of which is connected to the extraction unit, is used for drying the lignin residue.

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