A biodiesel integrated production device and method

Abstract

The present invention relates to an integrated biodiesel production device and method, the production device includes a grease raw material supply device, a grease purification tower, an esterification reaction tower, a distillation desulfurization tower, a finished product blending tower, an additive supply device, a fossil diesel supply device and a controller; during the production process, a grease content Map diagram of the grease content with respect to the power of the centrifugal separation device and the sedimentation time of the first sedimentation device is established. Compared with the prior art, the present invention does not require the use of an additional mixing device, and finally obtains a mixed fuel with good oxidation stability, reducing the number of processes; firstly, a grease content Map diagram is established, and the grease content of the pre-treated grease can be directly obtained according to the power of the centrifugal separation device and the sedimentation time of the first sedimentation device, and then the amount of subsequent catalysts and additives used is determined according to the grease content of the pre-treated grease, so that the preparation of biodiesel can be carried out more accurately, raw material shortage or waste can be avoided, and production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of biodiesel preparation, and in particular to an integrated biodiesel production device and method. Background Art

[0002] Biodiesel is an important renewable energy source that can directly replace or be blended with fossil diesel. It is an excellent substitute for fossil diesel. Biodiesel is a fuel made from methyl ester or ethyl ester made from oil crops, wild oil plants or engineered microalgae, animal fats, waste cooking oils, etc. through esterification and transesterification processes.

[0003] my country consumes more than 38 million tons of edible oil every year, of which 20-30% is waste cooking oil. Using waste cooking oil as raw material to produce biodiesel can meet the promotion and use of biodiesel. However, the sources of waste cooking oil are complex, the preparation process is difficult, and the internationally used biodiesel production process is poorly adaptable. Therefore, a biodiesel production device suitable for waste cooking oil from complex sources is urgently needed.

[0004] On the one hand, in the prior art, in the biodiesel production process, due to the complex sources of waste edible oils and the high acid value of raw materials, the pretreatment process is very complicated, and the finished biodiesel has poor oxidation stability and high sulfur content. On the other hand, in actual use, biodiesel is often mixed with fossil diesel in a certain proportion. After the biodiesel is prepared, it is transferred and a separate mixing device is used to mix biodiesel and fossil diesel. The mixing accuracy is low, and the process is increased, which reduces the production efficiency.

[0005] In addition, Chinese patent 201910805870.9 discloses a process for preparing biodiesel, which adds reduced pressure distillation and other methods to improve the purity of biodiesel, and uses a heterogeneous solid base catalyst to catalyze the reaction, thereby increasing the yield of biodiesel and improving the physical and chemical properties of biodiesel in all aspects. However, when preparing biodiesel, this method simply determines the amount of water, catalyst, etc. added during the preparation process based on the weight of the raw oil, without considering the effect of the coexistence of oil, water and solid residue in the waste oil raw material on the oil content of the raw material. The amount of water, catalyst, etc. added does not match the oil content, resulting in problems such as low conversion rate and excessive water or additives. Summary of the invention

[0006] The purpose of the present invention is to provide an integrated biodiesel production device and method in order to overcome the defects of the above-mentioned prior art. No additional mixing device is required, and a mixed fuel with good oxidation stability is finally obtained, which reduces the number of steps. A fat content map is first established, and then the amount of subsequent catalysts and additives used is determined according to the fat content of the pretreated fat. This can more accurately prepare biodiesel, avoid insufficient or waste raw materials, and improve production efficiency.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A biodiesel integrated production device, comprising a fat raw material supply device, a fat purification tower, an esterification reaction tower, a distillation desulfurization tower, a finished product blending tower, an additive supply device, a fossil diesel supply device and a controller, wherein the controller is respectively connected to the fat raw material supply device, the fat purification tower, the esterification reaction tower, the distillation desulfurization tower, the finished product blending tower, the additive supply device, and the fossil diesel supply device in communication;

[0009] The controller is used to control the oil raw material supply device, the oil purification tower, the esterification reaction tower, the distillation and desulfurization tower, the finished product blending tower, the additive supply device, and the fossil diesel supply device;

[0010] The oil purification tower is connected to the oil raw material supply device and the esterification reaction tower respectively, and is used to perform heating operation, filtering operation, separation operation and sedimentation operation on the oil raw material to obtain pre-treated oil;

[0011] The esterification reaction tower is connected to the distillation desulfurization tower, and is used to perform esterification reaction and transesterification reaction on the pretreated oil to obtain crude biodiesel;

[0012] The rectification and desulfurization tower is connected to the finished product blending tower and is used to perform vacuum distillation operation on the crude biodiesel to obtain biodiesel;

[0013] The finished product blending tower is connected to the additive supply device and the fossil diesel supply device respectively, and is used to mix the biodiesel, additive and fossil diesel to obtain a mixed fuel.

[0014] Furthermore, the oil purification tower includes a heating device, a filtering device, a residue outlet, a centrifugal separation device and a first sedimentation device, and the heating device, the centrifugal separation device and the first sedimentation device are all connected to the controller in communication;

[0015] The heating device is used to heat the oil raw material;

[0016] The filtering device is used to filter the oil and fat raw material to obtain the oil and water raw material and the residue;

[0017] The residue outlet is used to discharge the residue;

[0018] The centrifugal separation device and the first sedimentation device are used to perform separation operations and sedimentation operations on the oil-water raw materials to obtain pre-treated oils and fats.

[0019] Furthermore, the filtering device is a multi-layer filtering device.

[0020] Further, the esterification reaction tower includes an esterification reactor, an ester exchange reactor, a catalyst supply device and a second settling device, and the catalyst supply device is communicatively connected with the controller;

[0021] The esterification reactor is used to perform esterification reaction on the pretreated oil to obtain an esterified mixture;

[0022] The second sedimentation device is used to perform sedimentation operation on the esterification mixture to obtain esterified oil;

[0023] The transesterification reactor is used to carry out transesterification reaction on the esterified oil to obtain crude biodiesel;

[0024] The catalyst supply device is used to provide catalysts for esterification reaction and transesterification reaction respectively.

[0025] Furthermore, the catalyst supply device includes a concentrated sulfuric acid supply device, a methanol supply device, and a potassium hydroxide solution supply device.

[0026] Further, the rectification and desulfurization tower includes a vacuum distillation device, a third settling device and a by-product recovery device, and the vacuum distillation device is communicatively connected with the controller;

[0027] The third sedimentation device and the vacuum distillation device are used to perform sedimentation operations and vacuum distillation operations on the crude biodiesel product to obtain biodiesel and by-products;

[0028] The by-product recovery device is used to recover by-products obtained in the sedimentation operation and the reduced pressure distillation operation.

[0029] Furthermore, the by-product recovery device includes a glycerol recovery device and a bio-heavy oil recovery device.

[0030] Furthermore, the finished product blending tower includes a stirring device and a mixed fuel outlet;

[0031] The stirring device is used to mix the biodiesel, additives and fossil diesel to obtain a mixed fuel;

[0032] The mixed fuel outlet is used for discharging the mixed fuel.

[0033] A biodiesel integrated production method, based on the above-mentioned biodiesel integrated production device, comprises the following steps:

[0034] S1: Establishing a grease content map, wherein the grease content map is a map of grease content with respect to the power of the centrifugal separation device and the sedimentation time of the first sedimentation device;

[0035] S2: The oil and fat raw material supply device is turned on, and the oil and fat raw material enters the oil and fat purification tower. The oil and fat raw material is heated by the heating device, and then filtered by the filtering device to obtain oil-water raw material and residue. The residue is discharged through the residue outlet, and the oil-water raw material is separated and settled by the centrifugal separation device and the first sedimentation device to obtain pre-treated oil; the power of the centrifugal separation device and the sedimentation time of the first sedimentation device are obtained, and the oil content of the pre-treated oil is obtained according to the oil content Map;

[0036] S3: the pretreated oil enters the esterification reactor of the esterification reaction tower, the amount of catalyst added is determined according to the oil content of the pretreated oil, the catalyst supply device is turned on, and the catalyst is added to the esterification reactor for esterification reaction to obtain an esterification mixture; the esterification mixture is subjected to sedimentation operation by a second sedimentation device to obtain esterified oil; the esterified oil enters the transesterification reactor of the esterification reaction tower, the amount of catalyst added is determined according to the oil content of the pretreated oil, the catalyst supply device is turned on, and the catalyst is added to the transesterification reactor for transesterification reaction to obtain crude biodiesel;

[0037] S4: The crude biodiesel product enters the distillation desulfurization tower, and the crude biodiesel product is subjected to sedimentation and vacuum distillation operations through the third sedimentation device and the vacuum distillation device to obtain biodiesel and by-products; the by-products obtained in the sedimentation and vacuum distillation operations are recovered through the by-product recovery device;

[0038] S5: Biodiesel enters the finished product blending tower, the amount of additive added is determined according to the oil content of the pretreated oil, the amount of fossil diesel added is determined according to the mixing ratio of the mixed fuel, the additive supply device and the fossil diesel supply device are turned on, and the biodiesel, additive and fossil diesel are mixed by the stirring device to obtain a mixed fuel, which is discharged through the mixed fuel outlet.

[0039] Furthermore, the step S1 is specifically as follows: the oil raw material is heated and filtered in an oil purification tower to obtain an oil-water raw material, the oil-water raw material is separated and settled by a centrifugal separation device and a first sedimentation device to obtain pretreated oil, the power of the centrifugal separation device and the sedimentation time of the first sedimentation device are recorded, and the content of the pretreated oil is measured and recorded; the above operation is repeated until a map of the oil content with respect to the power of the centrifugal separation device and the sedimentation time of the first sedimentation device is obtained.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) An integrated biodiesel production device is provided, wherein the oil raw material is passed through an oil purification tower, an esterification reaction tower and a distillation and desulfurization tower to obtain biodiesel, and the biodiesel, additives and fossil diesel are mixed in a finished product blending tower to obtain a mixed fuel with good oxidation stability. No additional mixing device is required, the process is reduced and the production efficiency is improved.

[0042] (2) The amount of subsequent catalysts and additives used is determined based on the oil content of the pretreated oil obtained from the oil purification tower, which can more accurately prepare biodiesel and avoid insufficient or waste raw materials. First, a oil content map is established, and then the oil content of the pretreated oil can be determined based on the power of the centrifugal separation device and the sedimentation time of the first sedimentation device. The oil content of the pretreated oil can be quickly obtained, thereby improving production efficiency.

[0043] (3) The controller is used to control the addition of oil raw materials, catalysts and additives, and the reactions in oil purification towers, esterification reaction towers, etc. The control method is more scientific and the control accuracy is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of the integrated biodiesel production device in the embodiment;

[0045] Figure numerals: 1. Oil and fat raw material supply device, 2. Oil and fat purification tower, 21. Heating device, 22. Filtering device, 23. Residue outlet, 24. Centrifugal separation device, 25. First sedimentation device, 3. Esterification reaction tower, 31. Esterification reactor, 32. Transesterification reactor, 33. Catalyst supply device, 4. Distillation and desulfurization tower, 41. Vacuum distillation device, 42. Third sedimentation device, 5. Finished product blending tower, 51. Mixed fuel outlet, 6. Additive supply device, 7. Fossil diesel supply device. DETAILED DESCRIPTION

[0046] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0047] Embodiment 1:

[0048] In this embodiment, waste cooking oil is used as a raw material to produce biodiesel, and the biodiesel is mixed with fossil diesel to obtain a mixed fuel.

[0049] A biodiesel integrated production device, such as Figure 1As shown, it includes a fat raw material supply device 1, a fat purification tower 2, an esterification reaction tower 3, a distillation desulfurization tower 4, a finished product blending tower 5, an additive supply device 6, a fossil diesel supply device 7 and a controller (not marked in the figure), and the controller is respectively communicated with the fat raw material supply device 1, the fat purification tower 2, the esterification reaction tower 3, the distillation desulfurization tower 4, the finished product blending tower 5, the additive supply device 6, and the fossil diesel supply device 7; the controller is used to control the fat raw material supply device 1, the fat purification tower 2, the esterification reaction tower 3, the distillation desulfurization tower 4, the finished product blending tower 5, the additive supply device 6, and the fossil diesel supply device 7.

[0050] The oil purification tower 2 is connected to the oil raw material supply device 1 and the esterification reaction tower 3 respectively, and is used to perform heating operation, filtering operation, separation operation and sedimentation operation on the oil raw material to obtain pre-treated oil. Specifically, the oil purification tower 2 includes a heating device 21, a filtering device 22, a residue outlet 23, a centrifugal separation device 24 and a first sedimentation device 25, and the heating device 21, the centrifugal separation device 24 and the first sedimentation device 25 are all connected to the controller for communication; the heating device 21 is used to heat the oil raw material; the filtering device 22 is used to filter the oil raw material to obtain oil-water raw material and residue; the residue outlet 23 is used to discharge the residue; the centrifugal separation device 24 and the first sedimentation device 25 are used to separate and sediment the oil-water raw material to obtain pre-treated oil.

[0051] In this embodiment, the filtering device 22 is a multi-layer filtering device, which can filter the solid residues in the heated and melted food waste oil.

[0052] The esterification reaction tower 3 is connected to the rectification and desulfurization tower 4, and is used to perform esterification reaction and transesterification reaction on the pretreated oil to obtain crude biodiesel. Specifically, the esterification reaction tower 3 includes an esterification reactor 31, an transesterification reactor 32, a catalyst supply device 33 and a second sedimentation device 34, and the catalyst supply device 33 is connected to the controller for communication; the esterification reactor 31 is used to perform esterification reaction on the pretreated oil to obtain an esterified mixture; the second sedimentation device 34 is used to perform sedimentation operation on the esterified mixture to obtain esterified oil; the transesterification reactor 32 is used to perform transesterification reaction on the esterified oil to obtain crude biodiesel; the catalyst supply device 33 is used to provide catalysts for esterification reaction and transesterification reaction.

[0053] The catalyst supply device 33 includes a concentrated sulfuric acid supply device, a methanol supply device, and a potassium hydroxide solution supply device. In order to more accurately determine the amount of catalyst added, the oil content of the pretreated oil obtained in the oil purification tower 2 can be obtained, and the amount of concentrated sulfuric acid, methanol and potassium hydroxide solution added can be determined according to the oil content to avoid excessive waste or too little reduction in conversion efficiency.

[0054] In this embodiment, the amount of concentrated sulfuric acid and methanol to be added is determined according to the oil content of the pretreated oil, and concentrated sulfuric acid and methanol are added to the esterification reactor 31 to carry out an esterification reaction to obtain an esterified mixture; the second sedimentation device 34 is used to perform sedimentation operations on the esterified mixture, the upper layer is the esterified oil, which is sent to the ester exchange reactor 32, and the lower layer is subjected to a vacuum film dealcoholization operation in the second sedimentation device 3 to obtain methanol, and the recovered methanol can be reused; the amount of potassium hydroxide solution to be added is determined according to the oil content of the pretreated oil, and an ester exchange reaction is carried out in the ester exchange reactor 32 to obtain a crude biodiesel product.

[0055] The distillation desulfurization tower 4 is connected to the finished product blending tower 5, and is used to perform a vacuum distillation operation on the crude biodiesel to obtain biodiesel. Specifically, the distillation desulfurization tower 4 includes a vacuum distillation device 41, a third sedimentation device 42 and a by-product recovery device, and the vacuum distillation device 41 is communicatively connected to the controller. The third sedimentation device 42 and the vacuum distillation device 41 are used to perform sedimentation operations and vacuum distillation operations on the crude biodiesel to obtain biodiesel and by-products; the by-product recovery device is used to recover the by-products obtained in the sedimentation operation and the vacuum distillation operation. The by-product recovery device includes a glycerol recovery device and a bio-heavy oil recovery device.

[0056] In this embodiment, the crude biodiesel is initially settled in the third settling device 42, and the upper layer is first subjected to a vacuum film dealcoholization operation to recover methanol, and then passes through a reduced pressure distillation device 41 to separate fatty acid methyl esters (i.e., biodiesel) and bio-heavy oil with higher purity according to different distillation points; the lower layer is a mixture of methanol and glycerol, and the vacuum film dealcoholization operation is also adopted to separate methanol and glycerol. Glycerol and bio-heavy oil are by-products, which are recovered through a by-product recovery device, and methanol can be collected and reused.

[0057] The finished product blending tower 5 is connected to the additive supply device 6 and the fossil diesel supply device 7 respectively, and is used to mix the biodiesel, additives and fossil diesel to obtain a mixed fuel. The finished product blending tower 5 includes a mixed fuel outlet 51 and a stirring device; the stirring device is used to mix the biodiesel, additives and fossil diesel to obtain a mixed fuel; and the mixed fuel outlet 51 is used to discharge the mixed fuel.

[0058] Since the biodiesel prepared from waste cooking oil has poor oxidation stability, it is necessary to add additives for oxidation modification to improve the oxidation stability of biodiesel. The amount of additives added can be determined according to the oil content of the pretreated oil. The mixed fuel is obtained by mixing biodiesel and fossil diesel in a certain proportion. If the required mixed fuel is B5, that is, biodiesel accounts for 5% by volume and fossil diesel accounts for 95% by volume, the fossil diesel supply device 7 is adjusted by the controller to adjust the amount of fossil diesel added, and finally mixed evenly by the stirring device to obtain the required mixed fuel.

[0059] The stirring device may be a heated spiral stirrer, which can not only mix the biodiesel, additives and fossil diesel evenly, but also heat them at the same time, thereby accelerating the mixing speed and improving the oil quality.

[0060] A biodiesel integrated production method comprises the following steps:

[0061] S1: Establishing a grease content map, wherein the grease content map is a map of the grease content with respect to the power of the centrifugal separation device 24 and the sedimentation time of the first sedimentation device 25 .

[0062] Step S1 is specifically as follows: the oil raw material is heated and filtered in the oil purification tower 2 to obtain an oil-water raw material, the oil-water raw material is separated and settled by a centrifugal separation device 24 and a first settling device 25 to obtain pretreated oil, the power of the centrifugal separation device 24 and the settling time of the first settling device 25 are recorded, and the content of the pretreated oil is measured and recorded; the above operation is repeated until a map of the oil content with respect to the power of the centrifugal separation device 24 and the settling time of the first settling device 25 is obtained.

[0063] In this way, in the subsequent biodiesel preparation process, the oil content of the pretreated oil can be determined according to the oil content Map, the power of the centrifugal separation device 24 and the sedimentation time of the first sedimentation device 25, and then the amount of catalyst added in the subsequent esterification reaction tower 3 and the amount of additives added in the finished product blending tower 5 can be determined. There is no need to measure the oil content of the pretreated oil every time, which saves time, reduces processes and improves production efficiency.

[0064] S2: Open the oil raw material supply device 1, the oil raw material enters the oil purification tower 1, the oil raw material is heated by the heating device 21, and then filtered by the filtering device 22 to obtain oil-water raw material and residue, the residue is discharged through the residue outlet 23, the oil-water raw material is separated and settled by the centrifugal separation device 34 and the first sedimentation device 25 to obtain pretreated oil; the power of the centrifugal separation device 24 and the sedimentation time of the first sedimentation device 25 are obtained, and the oil content of the pretreated oil is obtained according to the oil content Map.

[0065] S3: The pretreated oil enters the esterification reactor 31 of the esterification reaction tower 3, the amount of catalyst added is determined according to the oil content of the pretreated oil, the catalyst supply device 33 is turned on, and the catalyst is added to the esterification reactor 34 for esterification reaction to obtain an esterification mixture; the esterification mixture is subjected to sedimentation operation by the second sedimentation device 34 to obtain esterified oil; the esterified oil enters the ester exchange reactor 32 of the esterification reaction tower 3, the amount of catalyst added is determined according to the oil content of the pretreated oil, the catalyst supply device 33 is turned on, and the catalyst is added to the ester exchange reactor 32 for ester exchange reaction to obtain crude biodiesel.

[0066] S4: The crude biodiesel enters the distillation desulfurization tower 4, and is subjected to sedimentation and vacuum distillation operations by the third sedimentation device 42 and the vacuum distillation device 41 to obtain biodiesel and by-products; the by-products obtained in the sedimentation and vacuum distillation operations are recovered by the by-product recovery device.

[0067] S5: Biodiesel enters the finished product blending tower 5, the amount of additive added is determined according to the oil content of the pretreated oil, and the amount of fossil diesel added is determined according to the mixing ratio of the mixed fuel, the additive supply device 6 and the fossil diesel supply device 7 are turned on, and the biodiesel, additive and fossil diesel are mixed by the stirring device to obtain a mixed fuel, which is discharged through the mixed fuel outlet 51.

[0068] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A biodiesel integrated production method, based on a biodiesel integrated production device, the biodiesel integrated production device comprising a fat raw material supply device (1), a fat purification tower (2), an esterification reaction tower (3), and a distillation and desulfurization tower (4), characterized in that: It also includes a finished product blending tower (5), an additive supply device (6), a fossil diesel supply device (7) and a controller, wherein the controller is respectively connected to the oil raw material supply device (1), the oil purification tower (2), the esterification reaction tower (3), the distillation and desulfurization tower (4), the finished product blending tower (5), the additive supply device (6), and the fossil diesel supply device (7); The controller is used to control an oil raw material supply device (1), an oil purification tower (2), an esterification reaction tower (3), a distillation and desulfurization tower (4), a finished product blending tower (5), an additive supply device (6), and a fossil diesel supply device (7); The oil purification tower (2) is connected to the oil raw material supply device (1) and the esterification reaction tower (3) respectively, and is used to perform heating operations, filtering operations, separation operations and sedimentation operations on the oil raw materials to obtain pre-treated oil; The esterification reaction tower (3) is connected to the distillation desulfurization tower (4) and is used to perform esterification reaction and transesterification reaction on the pretreated oil to obtain crude biodiesel; The rectification and desulfurization tower (4) is connected to the finished product blending tower (5) and is used to perform a vacuum distillation operation on the crude biodiesel product to obtain biodiesel; The finished product blending tower (5) is connected to the additive supply device (6) and the fossil diesel supply device (7) respectively, and is used to mix the biodiesel, the additive and the fossil diesel to obtain a mixed fuel; The oil purification tower (2) comprises a heating device (21), a filtering device (22), a residue outlet (23), a centrifugal separation device (24) and a first sedimentation device (25), wherein the heating device (21), the centrifugal separation device (24) and the first sedimentation device (25) are all in communication connection with a controller; The heating device (21) is used to heat the oil raw material; The filtering device (22) is used to filter the oil and fat raw material to obtain the oil and water raw material and the residue; The residue outlet (23) is used to discharge the residue; The centrifugal separation device (24) and the first sedimentation device (25) are used to perform separation operations and sedimentation operations on the oil-water raw materials to obtain pretreated oil; The filtering device (22) is a multi-layer filtering device; The esterification reaction tower (3) comprises an esterification reactor (31), an ester exchange reactor (32), a catalyst supply device (33) and a second sedimentation device (34), wherein the catalyst supply device (33) is communicatively connected to a controller; The esterification reactor (31) is used to perform an esterification reaction on the pretreated oil to obtain an esterified mixture; The second sedimentation device (34) is used to perform sedimentation operation on the esterification mixture to obtain esterification oil; The transesterification reactor (32) is used to carry out a transesterification reaction on the esterified oil to obtain a crude biodiesel product; The catalyst supply device (33) is used to provide catalysts for the esterification reaction and the transesterification reaction respectively; The catalyst supply device (33) comprises a concentrated sulfuric acid supply device, a methanol supply device, and a potassium hydroxide solution supply device; The rectification and desulfurization tower (4) comprises a vacuum distillation device (41), a third sedimentation device (42) and a by-product recovery device, and the vacuum distillation device (41) is communicatively connected to the controller; The third sedimentation device (42) and the vacuum distillation device (41) are used to perform sedimentation operations and vacuum distillation operations on the crude biodiesel product to obtain biodiesel and by-products; The by-product recovery device is used to recover the by-products obtained in the sedimentation operation and the reduced pressure distillation operation; The by-product recovery device includes a glycerol recovery device and a biological heavy oil recovery device; The finished product blending tower (5) comprises a stirring device and a mixed fuel outlet (51); The stirring device is used to mix the biodiesel, additives and fossil diesel to obtain a mixed fuel; The mixed fuel outlet (51) is used to discharge the mixed fuel; The biodiesel integrated production method comprises the following steps: S1: establishing a grease content map, wherein the grease content map is a map of the grease content with respect to the power of the centrifugal separation device (24) and the sedimentation time of the first sedimentation device (25); S2: The oil and fat raw material supply device (1) is turned on, and the oil and fat raw material enters the oil and fat purification tower (2). The oil and fat raw material is heated by the heating device (21), and then filtered by the filtering device (22) to obtain oil and water raw material and residue. The residue is discharged through the residue outlet (23). The oil and water raw material is separated and settled by the centrifugal separation device (24) and the first settling device (25) to obtain pre-treated oil and fat; the power of the centrifugal separation device (24) and the settling time of the first settling device (25) are obtained, and the oil content of the pre-treated oil and fat is obtained according to the oil content map; S3: the pretreated oil enters the esterification reactor (31) of the esterification reaction tower (3), the amount of catalyst added is determined according to the oil content of the pretreated oil, the catalyst supply device (33) is turned on, and the catalyst is added to the esterification reactor (31) to carry out an esterification reaction to obtain an esterified mixture; the esterification mixture is subjected to a sedimentation operation by a second sedimentation device (34) to obtain an esterified oil; the esterified oil enters the transesterification reactor (32) of the esterification reaction tower (3), the amount of catalyst added is determined according to the oil content of the pretreated oil, the catalyst supply device (33) is turned on, and the catalyst is added to the transesterification reactor (32) to carry out an esterification reaction to obtain a crude biodiesel product; S4: the crude biodiesel product enters the distillation desulfurization tower (4), and the crude biodiesel product is subjected to sedimentation and vacuum distillation operations through the third sedimentation device (42) and the vacuum distillation device (41) to obtain biodiesel and by-products; the by-products obtained in the sedimentation and vacuum distillation operations are recovered through the by-product recovery device; S5: The biodiesel enters the finished product blending tower (5), the amount of additive added is determined according to the fat content of the pretreated fat, the amount of fossil diesel added is determined according to the mixing ratio of the mixed fuel, the additive supply device (6) and the fossil diesel supply device (7) are turned on, and the biodiesel, additive and fossil diesel are mixed by the stirring device to obtain a mixed fuel, which is discharged through the mixed fuel outlet (51).

2. The integrated biodiesel production method according to claim 1, characterized in that: The step S1 specifically comprises: heating and filtering the oil raw material in the oil purification tower (2) to obtain an oil-water raw material, separating and settling the oil-water raw material through a centrifugal separation device (24) and a first settling device (25) to obtain pre-treated oil, recording the power of the centrifugal separation device (24) and the settling time of the first settling device (25), and measuring and recording the content of the pre-treated oil; repeating the above operation until a map of the oil content with respect to the power of the centrifugal separation device (24) and the settling time of the first settling device (25) is obtained.

Images