Intelligent continuous production and processing equipment for acid oil

Abstract

The utility model provides intelligent continuous production and processing equipment for acidified oil, which comprises a PLC (programmable logic controller), a raw material premixing and conveying system, a micro-mixing rapid reactor, a gas-liquid separator, a reaction product conveying system, a vertical settling tank, an acidified oil conveying system, an oil residue conveying system, an acidified water conveying system and a steam conveying system, the raw material premixing and conveying system is used for realizing quantitative mixing and conveying of soapstock and / or foots and a sulfuric acid solution to a feeding hole of the micro-mixing rapid reactor, the micro-mixing rapid reactor can realize micro-mixing of raw materials conveyed by the raw material premixing and conveying system, and a discharging end of the micro-mixing rapid reactor is communicated with a feeding end of the gas-liquid separator; the reaction product conveying system is used for conveying liquid flowing out of the liquid outlet end of the gas-liquid separator into the vertical settling tank. The processing equipment is small in investment and occupied area, low in investment cost and capable of realizing continuous and efficient production and processing of the acid oil.

Description

Technical Field

[0001] The utility model relates to the technical field of acidified oil production and processing, in particular to an intelligent continuous production and processing device for acidified oil. Background Art

[0002] Acidified oil is essentially fatty acid, which contains pigments and various components such as unacidified triglycerides, diglycerides, and monoglycerides (neutral oil). The fatty acid in acidified oil is a long-chain fatty acid, and the carbon chain is generally between 12 and 24, mainly between 16 and 18. Depending on the source of the oil, there are different distributions of saturated and unsaturated carbon chains in acidified oil. The main industrial use of acidified oil is to manufacture fatty acid methyl ester (biodiesel), and it is also used to produce chemical raw materials such as oleic acid.

[0003] The existing acidified oil processing process is as follows:

[0004] 1. The soap stock and oil foot produced by each oil refinery are unloaded from the vehicle and put into the tank or pool when they arrive at the factory.

[0005] 2. A certain amount of acid water is added to the pool for circulating bubble washing. When the fluidity of the material is good and an oil layer appears, it is considered that the bubble material is normal.

[0006] 3. The raw material after bubble material is transported into the processing tank or pool for heating and adding acid, and compressed air is introduced for stirring. The amount of acid added is 3-4% of the raw material amount, and steam is introduced for heating to 95-110 °C for acidification reaction.

[0007] 4. After the acidification reaction is completed, it is cooled, precipitated, and stratified. The oil, slag, and water will be stratified. After the precipitation and stratification are qualified, the water, slag, and oil are discharged. The acid water enters the bubble material pool for recycling use. The slag is discharged to the oil slag pool for further oil removal. The oil enters the oil sedimentation tank for further sedimentation to remove water and impurities. After being qualified, the oil is transported to the finished product tank and sold out of the warehouse after passing the inspection.

[0008] The above acidified oil processing process has the following problems:

[0009] 1. Long processing time: In the whole process of acidified oil processing production on a single acidified oil production line, the unloading and bubble material circulation takes 3 hours, the feeding and heating takes 3-4 hours, the acid addition and heating and stirring end takes 5-6 hours, and the sedimentation, stratification, water discharge, slag discharge, and oil discharge take 4-5 hours.

[0010] 2. Unstable quality: Due to the long processing time of the whole process, the process control data indicators are unstable, and in the processing link, the fine control of the steam volume, acid addition amount, stirring time, etc. is poor, and the quality indicators of the produced finished products are often unstable, sometimes high and sometimes low.

[0011] 3. Large exhaust gas emissions: Since steam heating and compressed air stirring are required during the processing, the whole process takes 5 - 6 hours. A large amount of steam is discharged and treated during this process, with the steam emission per hour being 110 - 120 m³ / h, which brings great pressure to the environmental protection disposal equipment and sharply increases the treatment cost.

[0012] 4. Large investment and high cost: Due to the large number of intermediate processing links and the need for space for material turnover and storage, a large number of tank groups and underground pools need to be invested in construction for material transfer and storage, which increases the construction cost. Waste in the intermediate links also increases, and the comprehensive production cost is relatively high. The comprehensive cost for processing one ton of raw materials is about 55 - 60 yuan, with a relatively high cost. Content of the Utility Model

[0013] The purpose of the present utility model is to provide an intelligent continuous production and processing equipment for acidified oil, which has a small investment in floor area, low investment cost and can realize the continuous and efficient production and processing of acidified oil.

[0014] The technical solution adopted by the present utility model to solve its technical problems is: An intelligent continuous production and processing equipment for acidified oil, including a PLC controller, a raw material premixing and conveying system, a micro - mixing rapid reactor, a gas - liquid separator, a reaction product conveying system, a vertical settling tank, an acidified oil conveying system, an oil residue conveying system, an acidified water conveying system, and a steam conveying system. The raw material premixing and conveying system is used to realize the quantitative mixing and conveying of soapstock and / or oil foot and sulfuric acid solution to the feeding port of the micro - mixing rapid reactor. The micro - mixing rapid reactor can realize the microscopic mixing of the raw materials conveyed by the raw material premixing and conveying system. The discharging end of the micro - mixing rapid reactor is communicated with the feeding end of the gas - liquid separator, and the gas - discharging end of the gas - liquid separator is communicated with the gas - inlet end of the micro - mixing rapid reactor. The reaction product conveying system is used to convey the liquid flowing out from the liquid - discharging end of the gas - liquid separator into the vertical settling tank. The acidified oil conveying system can realize the conveying of acidified oil in the upper region of the vertical settling tank. The oil residue conveying system can realize the conveying of oil residue in the middle region of the vertical settling tank. The acidified water conveying system can realize the conveying of acidified water in the lower region of the vertical settling tank. The steam conveying system is used to convey high - temperature steam to the gas - inlet end of the micro - mixing rapid reactor. The PLC controller can realize the operation control of the raw material premixing and conveying system, the micro - mixing rapid reactor, the acidified oil conveying system, the oil residue conveying system, the acidified water conveying system, and the steam conveying system.

[0015] Preferably, the micro-mixing rapid reactor includes a volute, an impeller, and a driving motor. The impeller is rotatably arranged in the volute. The driving motor is arranged at the bottom of the volute and is used to drive the impeller to rotate. The feed inlet of the volute is the gas inlet end and the feed inlet of the micro-mixing rapid reactor, and the discharge outlet of the volute is the discharge end of the micro-mixing rapid reactor. The driving motor is electrically connected to the PLC controller.

[0016] Further, a first distributor is arranged in the volute. The first distributor is used to evenly distribute the mixed material conveyed by the raw material premixing and conveying system above the impeller. The liquid outlet end of the first distributor is directly above the blade-free area in the middle of the impeller.

[0017] Further, the raw material premixing and conveying system includes a first raw material conveying system, a second raw material conveying system, and a premixing and conveying system. The first raw material conveying system includes a raw material storage tank, a first material conveying pump, a first electric valve, and a first flowmeter. A first conveying pipeline is arranged at the discharge outlet of the raw material storage tank. The first material conveying pump, the first electric valve, and the first flowmeter are arranged on the first conveying pipeline in sequence from upstream to downstream. The second raw material conveying system includes a sulfuric acid tank, a second material conveying pump, a second electric valve, and a second flowmeter. A second conveying pipeline is arranged at the discharge outlet of the sulfuric acid tank. The second material conveying pump, the second electric valve, and the second flowmeter are arranged on the second conveying pipeline in sequence from upstream to downstream. The premixing and conveying system includes a third conveying pipeline and a shearing pump. The first conveying pipeline and the second conveying pipeline are connected in parallel to the inlet end of the third conveying pipeline. The discharge end of the third conveying pipeline is connected to the inlet end of the first distributor. The shearing pump is arranged on the third conveying pipeline. The first material conveying pump, the first electric valve, the first flowmeter, the second material conveying pump, the second electric valve, the second flowmeter, and the shearing pump are electrically connected to the PLC controller.

[0018] Further, a pre-storage mixing tank is arranged on the third conveying pipeline upstream of the shearing pump.

[0019] Further, a gas conveying pipeline is arranged between the feed inlet of the volute and the gas outlet end of the gas-liquid separator.

[0020] Further, the steam conveying system includes a steam conveying pipeline. The steam conveying pipeline is connected to the gas conveying pipeline. A third electric valve and a third flowmeter are arranged on the steam conveying pipeline in sequence from upstream to downstream. A temperature sensor is arranged on the side wall of the liquid phase discharge end at the lower part of the gas-liquid separator. The third electric valve, the third flowmeter, and the temperature sensor are electrically connected to the PLC controller.

[0021] Furthermore, the reaction product conveying system includes a fourth conveying pipeline, a buffer tank, and a third material conveying pump. The fourth conveying pipeline connects the liquid outlet of the gas-liquid separator to the vertical settling tank, and the buffer tank and the third material conveying pump are arranged on the fourth conveying pipeline in sequence from upstream to downstream.

[0022] Furthermore, an acidified oil outlet, a slag outlet, and an acidified water outlet are respectively arranged in the upper region, the middle region, and the bottom region of the vertical settling tank. A first on-line densitometer is arranged below the acidified oil outlet, a second on-line densitometer is arranged below the slag outlet, and a third on-line densitometer is arranged above the acidified water outlet and below the second on-line densitometer. The acidified oil conveying system includes an acidified oil conveying pipeline, a fourth electric valve, and an oil storage tank. The acidified oil conveying pipeline connects the acidified oil outlet to the oil storage tank, and the fourth electric valve is arranged on the acidified oil conveying pipeline. The slag conveying system includes a slag conveying pipeline, a fifth electric valve, and a slag pond. The slag conveying pipeline connects the slag outlet to the slag pond, and the fifth electric valve is arranged on the slag conveying pipeline. The acidified water conveying system includes an acidified water conveying pipeline, a sixth electric valve, and a fourth material conveying pump. The acidified water conveying pipeline connects the raw material storage tank to the acidified water outlet, and the sixth electric valve and the fourth material conveying pump are connected in series on the acidified water conveying pipeline in sequence from upstream to downstream. The first on-line densitometer, the second on-line densitometer, the third on-line densitometer, the fourth electric valve, the fifth electric valve, the sixth electric valve, and the fourth material conveying pump are electrically connected to the PLC controller.

[0023] The beneficial effects of the present utility model are as follows:

[0024] The structure of the present utility model is compact, the total floor area is small, and the one-time investment cost is low, which is beneficial to reducing the production and manufacturing cost of acidified oil as a whole.

[0025] The raw material supply, acidification reaction, gas-liquid separation, reaction product conveying, and reaction product separation process steps of the present utility model can be continuously carried out synchronously at the same time, so as to realize the continuous production of acidified oil. Compared with the intermittent production process of the traditional single acidified oil production line, the production efficiency of acidified oil is greatly improved. At the same time, the turnover process of the reaction materials in each process does not require manual assistance, which greatly reduces the material loss in the material turnover process, and then is beneficial to increasing the output of acidified oil.

[0026] In the present utility model, both the raw material supply and the acidification reaction process can be automatically and precisely controlled by a PLC controller, and the time period for producing acidified oil is relatively short. Thus, the quality control of acidified oil products is achieved through a combination of source control and result feedback regulation, improving the stability of acidified oil products.

[0027] In the production and processing technological process of the present utility model, preliminary mixing reaction of soapstock and sulfuric acid is realized in the pipeline, and further mixing reaction is achieved by the transportation of a shear pump. A certain amount of heat is released synchronously during the mixing reaction in the above steps, which reversely promotes the degree of the mixing chemical reaction. In the micro-mixing rapid reactor, there is a large speed difference between the material transported by the shear pump and the impeller rotating at a high speed. When the material contacts the impeller, the flowing material is impacted by the blades of the impeller to achieve intense shearing and fragmentation. At the same time, driven by the impeller, the material flies out of the impeller at a relatively high linear velocity and finally impacts the side wall of the volute, thereby further realizing the fragmentation of the material. The material is sheared and fragmented quite finely, generating a huge and rapidly updated phase interface, thus greatly improving the micro-mixing and mass transfer processes between the phases of the mixed material. After the micro-mixing and mass transfer processes of the mixed material are greatly improved and coordinated with an appropriate reaction temperature, rapid chemical reaction of the mixed material can be realized, and then rapid acidification reaction can be achieved. The preliminary mixing reaction of the above material can proceed continuously, and at the same time, the acidification reaction can proceed rapidly and continuously, thus providing a basic condition for the continuous production of acidified oil.

[0028] The gas separated by the gas-liquid separator directly re-enters the micro-mixing rapid reactor through the gas transportation pipeline again, thereby realizing the recovery and utilization of steam waste heat and saving heat energy. Further, the high-temperature steam condenses into water during the process of heating the material, resulting in basically zero emission of the high-temperature steam, thus realizing low gas emission during the processing and improving the environmental protection quality of production.

[0029] By using the acidified oil transportation system, oil residue transportation system, and acidified water transportation system, the acidified oil, oil residue, and acidified water in the vertical settling tank can be effectively output in a timely manner, and then continuous transportation of reaction products into the vertical settling tank can be ensured, thus providing a guarantee for the continuous production of acidified oil. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some preferred embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1It is the overall structural flowchart of the present utility model;

[0032] Figure 2 It is the schematic diagram of the internal structure of the micro-mixing rapid reactor;

[0033] Figure 3 It is the schematic diagram of the distribution of baffle plates in the third conveying pipeline;

[0034] Figure 4 It is the structural flowchart of the raw material storage tank for discharging wastewater to the water treatment system;

[0035] In the figure: 1 control cabinet, 211 raw material storage tank, 212 first material conveying pump, 213 first electric valve, 214 first flowmeter, 215 first conveying pipeline, 221 sulfuric acid tank, 222 second material conveying pump, 223 second electric valve, 224 second flowmeter, 225 second conveying pipeline, 231 third conveying pipeline, 2311 baffle plate, 232 shear pump, 233 pre-storage mixing tank, 31 drive motor, 32 impeller, 33 volute, 34 first distributor, 35 temperature sensor, 4 gas-liquid separator, 41 gas conveying pipeline, 51 fourth conveying pipeline, 52 buffer tank, 53 third material conveying pump, 6 vertical settling tank, 61 second distributor, 71 acidified oil conveying pipeline, 72 fourth electric valve, 73 oil storage tank, 74 first on-line densitometer, 81 oil residue conveying pipeline, 82 fifth electric valve, 83 oil residue tank, 84 second on-line densitometer, 91 acidified water conveying pipeline, 92 sixth electric valve, 93 fourth material conveying pump, 94 third on-line densitometer, 101 steam conveying pipeline, 102 third electric valve, 103 third flowmeter, 201 PH sensor, 202 fourth on-line densitometer, 203 wastewater conveying pipeline, 204 seventh electric valve, 205 fifth material conveying pump. Specific embodiments

[0036] Next, specific embodiments and the appended Figures 1-4 , the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only some preferred embodiments of the present utility model, rather than all embodiments. Those skilled in the art can make similar deformations without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0037] Macroscopic mixing and microscopic mixing are two important concepts in chemical reaction engineering to describe mixing phenomena, which respectively represent mixing processes at different scales.

[0038] Macroscopic mixing refers to the mixing process carried out at a large scale (such as the equipment scale). It usually uses large-scale flows (such as the rotation of a stirrer, the convection of fluids, etc.) to carry fluid parcels to various parts of the reactor, thereby achieving the overall uniform distribution of the materials in the reactor.

[0039] Microscopic mixing refers to the mixing process at the molecular scale. It involves the mixing between fluid micro-elements (such as molecules or very small micro-clusters), and requires the mixing process to penetrate deep into the molecular level. In the state of microscopic mixing, the reactant molecules can fully contact and mix, thus achieving higher reaction efficiency and more uniform product distribution.

[0040] An intelligent continuous production and processing equipment for acidified oil (such as Figure 1As shown in the figure, the processing equipment includes a PLC controller, a raw material premixing and conveying system, a micro-mixing rapid reactor, a gas-liquid separator 4, a reaction product conveying system, a vertical settling tank 6, an acidified oil conveying system, an oil residue conveying system, an acidified water conveying system, and a steam conveying system. The gas-liquid separator 4 and the vertical settling tank 6 are both mature technical products in this technical field. The gas-liquid separator 4 is mainly used to effectively separate the gas phase and the liquid phase. In this specific embodiment, the centrifugal gas-liquid separator can be selected for the gas-liquid separator 4. The vertical settling tank 6 is mainly used for the natural sedimentation and stratification of multiple liquid phases with different densities. In this specific embodiment, the height and inner diameter of the vertical settling tank 6 can be reasonably designed according to the mass ratio of acidified oil, oil, and acidified water in the reaction product and the volume of the reaction product. The raw material premixing and conveying system is used to quantitatively mix and convey soapstock and / or foots oil and sulfuric acid solution to the feeding port of the micro-mixing rapid reactor. In the production and manufacturing process of acidified oil, generally, soapstock or foots oil is used as the production raw material. The production raw material is mixed with sulfuric acid and undergoes an acidification reaction under certain temperature conditions, thereby realizing the production of acidified oil. During the process of conveying the production raw material and sulfuric acid by the premixing and conveying system, the initial mixing reaction of the two materials is synchronously realized, which is beneficial to the complete realization of the subsequent mixed acidification reaction. The micro-mixing rapid reactor can realize the micro-mixing of the raw materials conveyed by the raw material premixing and conveying system. After the mixed materials achieve micro-mixing, under the corresponding temperature conditions, the acidification reaction of the mixed materials can be quickly realized. The discharging end of the micro-mixing rapid reactor is communicated with the feeding end of the gas-liquid separator 4. After the mixed materials quickly realize the acidification reaction in the micro-mixing rapid reactor, the reaction products directly enter the gas-liquid separator 4 for subsequent gas-liquid separation steps. The gas outlet end of the gas-liquid separator 4 is communicated with the gas inlet end of the micro-mixing rapid reactor. The gas separated by the gas-liquid separator 4 carries a certain amount of heat, and this heat enters the micro-mixing rapid reactor again with the gas, which can be used to heat the mixed materials in the micro-mixing rapid reactor, thus facilitating energy conservation. The reaction product conveying system is used to convey the liquid flowing out of the liquid outlet end of the gas-liquid separator 4 into the vertical settling tank 6. The vertical settling tank 6 uses the principle of gravity sedimentation to realize the natural sedimentation and stratification of the reaction products. The acidified oil conveying system can realize the conveying of the acidified oil in the upper region of the vertical settling tank 6. The oil residue conveying system can realize the conveying of the oil residue in the middle region of the vertical settling tank 6. The acidified water conveying system can realize the conveying of the acidified water in the lower region of the vertical settling tank 6. In this processing equipment, the mixed materials can quickly realize the acidification reaction in the micro-mixing rapid reactor, and the reaction product conveying system, the acidified oil conveying system, the oil residue conveying system, and the acidified water conveying system can continuously convey the corresponding materials, thus providing a guarantee for the continuous production of this processing equipment;The steam delivery system is used to deliver high-temperature steam to the air inlet end of the micro-mixing rapid reactor. By continuously delivering high-temperature steam into the micro-mixing rapid reactor through the steam delivery system, the ambient temperature in the micro-mixing rapid reactor can be continuously maintained within the reaction temperature range required for the acidification reaction, thereby ensuring the rapid progress of the acidification reaction. The PLC controller can realize the operation control of the raw material premixing and delivery system, the micro-mixing rapid reactor, the acidified oil delivery system, the oil residue delivery system, the acidified water delivery system, and the steam delivery system. By using the PLC controller, the intelligent automation control of this processing equipment can be realized, and the accurate control of the mixing raw material ratio and temperature conditions can be achieved, which is conducive to improving the product quality. The PLC controller is a mature technology product on the market and is mainly used in the field of industrial automation control. In this specific embodiment, the PLC controller is arranged in the control cabinet 1. At the same time, the manual control mode and the fully automated control mode of this processing equipment can be set in the PLC controller.;

[0041] In this specific embodiment, the micro-mixing rapid reactor is mainly used to achieve the rapid microscopic mixing of materials. The technical means to achieve the rapid microscopic mixing of materials is to make the mixed materials undergo high-intensity turbulent motion in the micro-mixing rapid reactor. With a large turbulence intensity, it is conducive to achieving the mixing and distribution of the mixed materials at the molecular scale. In this specific embodiment, the specific implementation manner of the micro-mixing rapid reactor is as follows: The micro-mixing rapid reactor includes a volute 33, an impeller 32, and a driving motor 31. The impeller 32 can be an open impeller, a semi-open impeller, or a closed impeller. The impeller 32 is rotatably arranged in the volute 33. The driving motor 31 is arranged at the bottom of the volute 33 and is used to drive the impeller 32 to rotate. In practical applications, the driving motor 31 can be a variable-frequency motor, and its maximum rotational speed is 5000 rpm. The inlet of the volute 33 is the gas inlet and the feed inlet of the micro-mixing rapid reactor, that is, the gas separated by the gas-liquid separator 4 and the raw materials transported by the raw material premixing and conveying system both enter the volute 33 through the inlet of the volute 33. The outlet of the volute 33 is the discharge end of the micro-mixing rapid reactor. The impeller 32 rotates at a high speed driven by the driving motor 31. There is a large speed difference between the high-speed rotating impeller 32 and the raw materials entering the volute 33. When the raw materials come into contact with the impeller 32, the high-speed rotating blades 321 impact the raw materials to achieve violent shearing and crushing of the raw materials. At the same time, driven by the blades 321, the materials fly out of the impeller at a high linear speed and finally impact the side wall of the volute, thereby further achieving the crushing of the materials. The materials are sheared and crushed quite finely, generating a huge and rapidly updated phase interface, thus greatly improving the microscopic mixing and mass transfer process between the phases of the mixed materials. After the microscopic mixing and mass transfer process of the mixed materials is greatly improved, with the coordination of an appropriate reaction temperature, the rapid chemical reaction of the mixed materials can be achieved, that is, the acidification reaction can be rapidly realized in the present utility model; the high-speed rotation of the impeller 32 in the volute 33 can also achieve the discharge of the reaction products. During the discharge of the reaction products, the inside of the volute 33 is in a negative pressure state, which is convenient for the gas separated by the gas-liquid separator 4 to enter the volute 33 again, thereby realizing the recovery and utilization of the gas waste heat. During the high-speed rotation of the impeller 32, the raw material premixing and conveying system continuously transports the mixed raw materials into the volute 33, thus ensuring the effective continuous progress of the acidification reaction in the volute 33; the driving motor 31 is electrically connected to the PLC controller, and the use of the temperature sensor 35 can realize the real-time monitoring of the internal environment temperature of the volute 33, thus providing a guarantee for facilitating the precise control of the acidification reaction temperature.Furthermore, when using the high-speed rotating impeller 32 and blades 321 to achieve high-speed shearing and crushing of the mixed materials, to ensure the shearing and crushing effects, a first distributor 34 is provided in the volute 33. The first distributor 34 is used to achieve the uniform distribution of the mixed materials conveyed by the raw material premixing and conveying system above the impeller 32. The liquid outlet end of the first distributor 34 is directly above the blade-free area in the middle of the impeller 32. The first distributor 34 can evenly spray the mixed materials on the blade-free area of the impeller 32. During the high-speed rotation of the impeller 32, the mixed materials falling into the blade-free area are driven by the high-speed impeller disc to achieve rotational mixing. During the rotational mixing process, under the action of centrifugal force, the mixed materials are dispersed and continuously approach the blades 321. After contacting the blades 321, they are strongly sheared and crushed. When the mixed materials leave the blades or the impeller disc, they have a high linear velocity. After the high-speed moving mixed materials collide with the side wall of the volute 33, a high-intensity turbulent mixing effect is achieved again. Therefore, the mixed materials entering the volute 33 undergo a general physical change process of mixing - dispersion - mixing, which is convenient for ultimately achieving microscopic mixing at the molecular scale.

[0042] Based on the above embodiments, the raw material premixing and conveying system includes a first raw material conveying system, a second raw material conveying system, and a premixing and conveying system. The first raw material conveying system includes a raw material storage tank 211, a first material conveying pump 212, a first electric valve 213, and a first flow meter 214. The oil foot and soap stock transported back from the factory can be directly poured into the raw material storage tank 211. At the same time, in the actual application process, a certain amount of acidified water can be poured into the raw material storage tank 211 to achieve preliminary acid foaming treatment of the oil foot and soap stock. A first conveying pipeline 215 is provided at the discharge port of the raw material storage tank 211. The first material conveying pump 212, the first electric valve 213, and the first flow meter 214 are arranged on the first conveying pipeline 215 in sequence from upstream to downstream. When the first material conveying pump 212 is a variable pump and the first electric valve 213 is an electric proportional regulating valve, the PLC controller is used to control the first material conveying pump 212 and the first electric valve 213, so as to achieve the flow control of the material in the first conveying pipeline 215. By using the flow monitoring signal fed back by the first flow meter 214 to the PLC controller, the variable pump of the first material conveying pump 212 or the first electric valve 213 can be adjusted and corrected, and then the precise control of the flow in the first conveying pipeline 215 can be achieved. The second raw material conveying system includes a sulfuric acid tank 221, a second material conveying pump 222, a second electric valve 223, and a second flow meter 224. A second conveying pipeline 225 is provided at the discharge port of the sulfuric acid tank 221. The second material conveying pump 222, the second electric valve 223, and the second flow meter 225 are arranged on the second conveying pipeline 225 in sequence from upstream to downstream. The second material conveying pump 222 is a variable pump and the second electric valve 223 is an electric proportional regulating valve. When the PLC controller is used to control the second material conveying pump 222 and the second electric valve 223, the flow control of sulfuric acid in the second conveying pipeline 225 can be achieved. By using the flow monitoring signal fed back by the second flow meter 224 to the PLC controller, the second material conveying pump 222 or the second electric valve 213 can be adjusted and corrected, and then the precise control of the flow in the second conveying pipeline 225 can be achieved;The premixed transportation system includes a third transportation pipeline 231 and a shear pump 232. The first transportation pipeline 215 and the second transportation pipeline 225 are connected in parallel to the feeding end of the third transportation pipeline 231, and the preliminary mixing of sulfuric acid and raw materials is realized in the third transportation pipeline 231. The discharging end of the third transportation pipeline 231 is connected to the feeding end of the first distributor 34. The shear pump 232 is arranged on the third transportation pipeline 231. The shear pump is a mature technical product in the prior art. During the transportation of materials, it can further shear and crush the materials, thereby improving the mixing effect of the materials. In the actual application process, to ensure that the shear pump 232 does not have the phenomenon of air binding and realize the smooth transportation of materials, here, a pre-storage mixing tank 233 is arranged on the third transportation pipeline 231 upstream of the shear pump 232. The pre-storage mixing tank 233 realizes the storage of a certain amount of materials, effectively preventing the shear pump 232 from having the problem of cavitation. To further improve the mixing effect of the mixed materials in the third transportation pipeline 231, here, a plurality of baffle plates 2311 are arranged in the third transportation pipeline 231 upstream of the pre-storage mixing tank 233 and are distributed in a staggered manner up and down. By using the blocking and redirecting effects of the multiple baffle plates 2311 on the flowing materials, the materials flow in an S shape in the third transportation pipeline 231, thereby promoting the further mixing of the materials. The first material transportation pump 212, the first electric valve 213, the first flowmeter 214, the second material transportation pump 222, the second electric valve 223, the second flowmeter 224 and the shear pump 222 are electrically connected to the PLC controller.;

[0043] A gas transportation pipeline 41 is arranged between the feeding port of the volute 33 and the gas outlet end of the gas-liquid separator 4. By using the guiding effect of the gas transportation pipeline 41, the high-temperature gas separated from the gas-liquid separator 4 enters the volute 33 again, realizing the effective collection of waste gas and the reuse of waste heat, and then realizing the environmental protection and energy-saving effect.

[0044] Based on the above embodiments, the specific implementation manner of the steam delivery system is as follows: The steam delivery system includes a steam delivery pipeline 101, which is in communication with the gas delivery pipeline 41. A third electric valve 102 and a third flowmeter 103 are arranged on the steam delivery pipeline 101 in sequence from upstream to downstream. A temperature sensor 35 is arranged on the side wall of the liquid-phase discharge end at the lower part of the gas-liquid separator 4. The third electric valve 102, the third flowmeter 103, and the temperature sensor 35 are electrically connected to the PLC controller. The third electric valve 102 is a proportional regulating valve. In the actual application process, the PLC controller receives the temperature data fed back by the temperature sensor 35 in real time, and adjusts the opening degree of the third electric valve 102 according to the fed-back temperature data, so as to realize the temperature adjustment in the volute 33. During the process of using high-temperature steam to adjust the temperature in the volute 33, the PLC controller uses the monitoring data of the third flowmeter 103 to realize the regulation and correction of the third electric valve 102, and then realizes the precise regulation of the reaction environment in the volute 33.

[0045] The reaction product delivery system realizes the delivery of the liquid-phase material flowing out of the gas-liquid separator 4. It can directly use a delivery pipeline to directly deliver the material into the vertical settling tank 6 by using the free flowability of the liquid. In this specific embodiment, in order to facilitate the active delivery of the liquid-phase material flowing out of the gas-liquid separator 4, here, the specific implementation manner of the reaction product delivery system is as follows: The reaction product delivery system includes a fourth delivery pipeline 51, a buffer tank 52, and a third material delivery pump 53. The fourth delivery pipeline 51 realizes the communication between the liquid outlet end of the gas-liquid separator 4 and the vertical settling tank 6. The buffer tank 52 and the third material delivery pump 53 are arranged on the fourth delivery pipeline 51 in sequence from upstream to downstream. The buffer tank 52 is used to temporarily store the reaction product, and then it is convenient for the staff to take samples for testing, so as to adjust and correct the previous process parameters according to the test results. In the actual application process, in order to minimize the disturbance of the material flowing out of the fourth delivery pipeline 51 to the liquid in the vertical settling tank 6, here, a second distributor 61 is arranged in the vertical settling tank 6. In the actual application process, the distribution height of the second distributor 61 can be based on the specific stratification phenomenon of the acidified oil, oil residue, and acidified water in the vertical settling tank 6, so that the second distributor 61 is distributed at the boundary between the acidified oil and the oil residue. The second distributor 61 is used to realize the uniform distribution of the material in the vertical settling tank 6. At the same time, by controlling the flow rate of the third material delivery pump 53, the flow rate of the material flowing out of the second distributor 61 is minimized, so as to ensure the basic stability of the stratified material in the vertical settling tank 4 to the greatest extent, and ensure the subsequent continuous and effective output of the stratified material.

[0046] On the basis of the above embodiments, the specific implementation manners of the acidified oil conveying system, the oil residue conveying system, and the acidified water conveying system are as follows: An acidified oil outlet, an oil residue outlet, and an acidified water outlet are respectively arranged in the upper region, the middle region, and the bottom region of the vertical settling tank 6. The upper region corresponds to the acidified oil area after the solution in the vertical settling tank 6 is stratified, the middle region corresponds to the oil residue area after the solution in the vertical settling tank 6 is stratified, and the bottom region corresponds to the acidified water area after the solution in the vertical settling tank 6 is stratified. A first on-line densitometer 74 is arranged below the acidified oil outlet, a second on-line densitometer 84 is arranged below the oil residue outlet, and a third on-line densitometer 94 is arranged above the acidified water outlet and the third on-line densitometer 94 is located below the second on-line densitometer 84. The above on-line densitometers are mature technical products on the market. In this specific embodiment, the DY-886 tuning fork vibration type on-line densitometer can be selected. The acidified oil conveying system includes an acidified oil conveying pipeline 71, a fourth electric valve 72, and an oil storage tank 73. The acidified oil conveying pipeline 71 realizes the through connection between the acidified oil outlet and the oil storage tank 73. The fourth electric valve 72 is arranged on the acidified oil conveying pipeline. The PLC controller uses the detection signal of the first on-line densitometer 74 to realize the on-off control of the fourth electric valve 72. The fourth electric valve 72 can be a proportional regulating valve. The oil residue conveying system includes an oil residue conveying pipeline 81, a fifth electric valve 82, and an oil residue tank 83. The oil residue conveying pipeline 81 realizes the through connection between the oil residue outlet and the oil residue tank 83. The fifth electric valve 82 is arranged on the oil residue conveying pipeline 81. The PLC controller uses the detection signal of the second on-line densitometer 84 to realize the on-off control of the fifth electric valve 82. The fifth electric valve 82 can be a proportional regulating valve. The acidified water conveying system includes an acidified water conveying pipeline 91, a sixth electric valve 92, and a fourth material conveying pump 93. The acidified water conveying pipeline realizes the through connection between the raw material storage tank 211 and the acidified water outlet. The sixth electric valve 92 and the fourth material conveying pump 93 are connected in series on the acidified water conveying pipeline 91 from upstream to downstream. The PLC controller uses the detection signal of the third on-line densitometer 94 to realize the on-off control of the sixth electric valve 92 and the fourth material conveying pump 93. The sixth electric valve 92 can be a proportional regulating valve, and the fourth material conveying pump 93 can be a variable pump. The first on-line densitometer 74, the second on-line densitometer 84, the third on-line densitometer 94, the fourth electric valve 72, the fifth electric valve 82, the sixth electric valve 92, and the fourth material conveying pump 93 are electrically connected to the PLC controller. In the actual application process, by effectively controlling the fourth electric valve 72, the fifth electric valve 82, the sixth electric valve 92, and the fourth material conveying pump 93 by the PLC controller, the acidified oil, oil residue, and acidified water after natural sedimentation and stratification in the vertical settling tank 6 can be effectively classified and separated, thus providing a guarantee for the continuous production of acidified oil.

[0047] The process for realizing the continuous processing and production of acidified oil by using the above acidified oil intelligent continuous production and processing equipment comprises the following steps:

[0048] S1. According to the actual production requirements, set the operating frequencies of the first material delivery pump 212, the second material delivery pump 222, the shearing pump 232, the drive motor 31, the third material delivery pump 53, and the fourth material delivery pump 93 in the operating program of the PLC controller. Set the delay start time interval t1 of the third material delivery pump 53 relative to the first material delivery pump 212. The purpose of the third material delivery pump 53 starting with a delay relative to the first material delivery pump 212 is to have a certain amount of reaction products in the buffer tank 52 before starting the third material delivery pump 53, so as to avoid the idling of the third material delivery pump 53 in the early stage. Set the temperature comparison thresholds T1 and T2. Set the comparison density range thresholds △ρ1, △ρ2, and △ρ3 of the first on-line densitometer 74, the second on-line densitometer 84, and the third on-line densitometer 94.

[0049] S2. Raw material supply;

[0050] Pour soapstock and / or foots oil into the raw material storage tank 211 containing acidified water; in the storage tank, the soapstock and / or foots oil and the acidified water are preliminarily mixed to form a mixed material.

[0051] S3. Acidification reaction;

[0052] Start the first material transfer pump 212, the second material transfer pump 222, the shear pump 232 and the drive motor 31 through the PLC controller; the continuous operation of the first material transfer pump 212 and the second material transfer pump 222 realizes the proportional transfer of the mixed material and sulfuric acid, and realizes the initial mixing reaction in the third transfer pipeline 231. The operation of the shear pump 232 realizes the further mixing reaction of the mixed material and sulfuric acid. The material mixed by the shear pump 232 is transported into the micro-mixing rapid reactor. The drive motor 31 keeps running continuously at the set speed while the temperature of the micro-mixing rapid reactor is kept between T1 and T2, and then realizes the rapid micro-mixing acidification reaction of the mixed material. In practical applications, the speed of the drive motor 31 can be set within 2000 - 3000 rpm. In this specific embodiment, the speed of the drive motor 31 can be set at 2500 rpm, the value of T1 is set at 90 °C, and the value of T2 is set at 105 °C. The main products of the acidification reaction are: acidified oil, oil residue and acidified water; during the rapid acidification reaction, the temperature sensor 35 transmits the monitored temperature data T3 to the PLC controller in real time. The PLC controller compares T3 with T1 and T2 in real time. When T1 ≤ T3 < T2 or T2 ≤ T3, at this time, the PLC controller makes the third electric valve 102 in the closed state, indicating that the environmental temperature condition in the volute is the appropriate reaction temperature and there is no need to use high-temperature steam to adjust the temperature. When T3 < T1, it indicates that the environmental temperature in the volute is lower than the lowest value of the required reaction temperature. At this time, high-temperature steam needs to be introduced to increase the temperature. The PLC controller opens the third electric valve 102 and realizes the opening degree control of the third electric valve 102 according to the set program. During the process of adjusting the opening degree of the third electric valve 102, the PLC controller makes real-time corrections to the opening degree of the third electric valve 102 according to the real-time feedback monitoring data of the third flow meter 103 to ensure the precise control of the steam flow rate, and then realizes the precise control of the temperature in the micro-mixing rapid reactor;

[0053] S4. Gas-liquid separation;

[0054] The mixed material that has completed the acidification reaction in the micro-mixing rapid reactor enters the gas-liquid separator 4 under the action of the high-speed rotation of the impeller 32. In the gas-liquid separator 4, the gas phase and the liquid phase of the mixed material are separated. The separated gas phase re-enters the micro-mixing rapid reactor through the gas transfer pipeline, and the separated liquid phase flows into the buffer tank 52;

[0055] S5. Reaction product transportation;

[0056] As the liquid-phase reaction products in the buffer tank 52 continuously increase, when the running time t2 of the first material transfer pump 212 ≥ t1, the PLC controller starts the third material transfer pump 53, and then realizes the continuous transfer of the materials in the buffer tank 52 to the vertical settling tank 6. In this specific embodiment, t1 can be set to 20 min;

[0057] S6. Separation of reaction products;

[0058] As the third material transfer pump 53 continuously conveys the reaction product into the vertical settling tank 6, the reaction product in the vertical settling tank 6 continuously increases. When the volume of the reaction product reaches a certain level and there is no significant disturbance, due to the different densities of acidified oil, oil residue, and acidified water, solution stratification is achieved in the vertical settling tank 6. During the continuous inflow of the reaction product into the vertical settling tank 6, the PLC controller continuously compares the density value ρ1 monitored by the first on-line densitometer 74 with △ρ1. In practical applications, assuming the density of acidified oil is ρ4, the density range of △ρ1 can be set between 0.95ρ4 - 1.05ρ4 (including 0.95ρ4 and 1.05ρ4). When ρ1 is within the sealing range of △ρ1, the PLC controller activates the fourth electric valve 72; otherwise, it closes the fourth electric valve 72. After the fourth electric valve 72 is opened, the output separation of the upper-layer acidified oil in the vertical settling tank 4 is realized. When ρ1 is within the sealing range of △ρ1, it indicates that the solution at the measurement position of the first on-line densitometer 74 is acidified oil, and the area above it is all acidified oil. At this time, the acidified oil can be discharged through the acidified oil outlet above the first on-line densitometer 74. The PLC controller continuously compares the density value ρ2 monitored by the second on-line densitometer with △ρ2. In practical applications, assuming the density of oil residue is ρ5, the density range of △ρ2 can be set between 0.95ρ5 - 1.05ρ5 (including 0.95ρ5 and 1.05ρ5). When ρ2 is within the sealing range of △ρ2, the PLC controller activates the fifth electric valve 82; otherwise, it closes the fifth electric valve 82. After the fifth electric valve 82 is opened, the output separation of the middle-layer oil residue in the vertical settling tank 6 is realized. When ρ2 is within the sealing range of △ρ2, it indicates that the solution at the measurement position of the second on-line densitometer 84 is oil residue, and a certain area above it is all oil residue. At this time, the oil residue can be discharged through the oil residue outlet above the second on-line densitometer 84. The PLC controller continuously compares the density value ρ3 monitored by the third on-line densitometer with △ρ3. In practical applications, assuming the density of acidified water is ρ6, the density range of △ρ3 can be set between 0.95ρ6 - 1.05ρ6 (including 0.95ρ6 and 1.05ρ6). When ρ3 is within the sealing range of △ρ3, the PLC controller activates the sixth electric valve 92 and the fourth material transfer pump 93; otherwise, it closes the sixth electric valve 92 and the fourth material transfer pump 93. After the sixth electric valve 92 and the fourth material transfer pump 93 are opened, the output separation of the lower-layer acidified water in the vertical settling tank 6 is realized, and the separated acidified water is continuously conveyed to the raw material storage tank 211. When ρ3 is within the sealing range of △ρ3, it indicates that the solution below the measurement position of the third on-line densitometer 94 is acidified water. At this time, the acidified water can be discharged through the acidified water outlet below the third on-line densitometer 94.

[0059] In practical applications, due to the continuous discharge of acidified water in the vertical settling tank 6 into the raw material storage tank 211, and at the same time, the raw materials from the factory are also continuously discharged into the raw material storage tank 211. The continuous increase of raw materials causes the pH value of the solution in the raw material storage tank 211 to continuously rise. At the same time, after long-term operation, the water in the raw material storage tank 211 will continuously increase. To reasonably control the solution volume in the raw material storage tank 211 to prevent it from overflowing, here, a pH sensor 201 is provided in the raw material storage tank 211, a waste water conveying pipeline 203 is provided at the bottom of the raw material storage tank 211, and the other end of the waste water conveying pipeline 203 is connected to an existing water treatment system in a through manner. A fourth on-line densitometer 202 is provided about 100 mm above the through connection between the raw material storage tank 211 and the waste water conveying pipeline 203. A seventh electric valve 204 and a fifth material conveying pump 205 are sequentially arranged on the waste water conveying pipeline 203 from upstream to downstream. The pH temperature sensor 201, the fourth on-line densitometer 202, the seventh electric valve 204 and the fifth material conveying pump 205 are all electrically connected to the PLC controller. During the actual working process, the pH comparison threshold value PH1 and the oil foot comparison threshold value range Δρ4 are set in the operation program of the PLC controller. When the system runs continuously, the pH sensor 201 and the fourth on-line densitometer 202 transmit the detection data to the PLC controller in real time. The PLC controller compares the on-line detected pH2 value with PH1. When pH2≥PH1, the PLC controller opens the seventh electric valve 204 and the fifth material conveying pump 205 to realize the discharge of waste water to the water treatment system. During the process of discharging waste water, the detected value ρ7 of the fourth on-line densitometer 202 is compared with the oil foot comparison threshold value range Δρ4. In this specific embodiment, it is assumed that the density of the floating material on the upper layer in the raw material storage tank 211 is ρ8, and the range of Δρ4 is 0.95ρ8 - 1.05ρ8. When ρ7 is within the range of Δρ4, the PLC controller closes the seventh electric valve 204 and the fifth material conveying pump 205 (at this time, it means that the waste water discharge reaches the prohibited discharge height of the floating layer. If the discharge continues, the oil foot raw materials will also be discharged into the water treatment system). After the seventh electric valve 204 and the fifth material conveying pump 205 are closed, the waste water discharge process is completed.

[0060] In the present utility model, "upper", "lower", "front", "rear", "left" and "right" are all relative positions adopted for conveniently describing the position relationship, and therefore cannot be understood as absolute positions to limit the protection scope.

[0061] Except for the technical features described in the specification, they are all known technologies to those skilled in the art.

[0062] The preferred embodiments and examples of the present utility model have been described in detail in conjunction with the accompanying drawings. However, the present utility model is not limited to the above-mentioned embodiments and examples. For those of ordinary skill in the art, without departing from the concept of the present utility model, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. An intelligent continuous production and processing equipment for acidified oil, characterized in that: The invention comprises a PLC controller, a raw material premixing and conveying system, a micro-mixing fast reactor, a gas-liquid separator, a reaction product conveying system, a vertical settling tank, an acidified oil conveying system, an oil residue conveying system, an acidified water conveying system, and a steam conveying system. The raw material premixing and conveying system is used to realize the quantitative mixing and conveying of soap stock and / or oil stock with sulfuric acid solution to the feed inlet of the micro-mixing fast reactor. The micro-mixing fast reactor can realize the micro-mixing of the raw materials conveyed by the raw material premixing and conveying system. The discharge end of the micro-mixing fast reactor is connected with the feed end of the gas-liquid separator. The gas outlet end of the gas-liquid separator is connected with the gas inlet end of the micro-mixing fast reactor. The system is used to transport the liquid flowing out of the liquid outlet end of the gas-liquid separator into the vertical settling tank. The acidified oil transportation system can realize the transportation of the acidified oil in the upper area of ​​the vertical settling tank. The oil residue transportation system can realize the transportation of the oil residue in the middle area of ​​the vertical settling tank. The acidified water transportation system can realize the transportation of the acidified water in the lower area of ​​the vertical settling tank. The steam transportation system is used to transport high-temperature steam to the air inlet end of the micro-mixing fast reactor. The PLC controller can realize the operation control of the raw material premixing transportation system, the micro-mixing fast reactor, the acidified oil transportation system, the oil residue transportation system, the acidified water transportation system and the steam transportation system.

2. The intelligent continuous production and processing equipment for acidified oil according to claim 1 is characterized in that: The micro-mixing fast reactor includes a volute, an impeller, and a drive motor. The impeller is rotatably arranged in the volute. The drive motor is arranged at the bottom of the volute and is used to drive the impeller to rotate. The feed inlet of the volute is the air inlet end and feed inlet of the micro-mixing fast reactor. The discharge port of the volute is the discharge end of the micro-mixing fast reactor. The drive motor is electrically connected to the PLC controller.

3. The intelligent continuous production and processing equipment for acidified oil according to claim 2 is characterized in that A first distributor is arranged in the volute, and the first distributor is used to achieve uniform distribution of the mixed material transported by the raw material premixing and conveying system above the impeller; the liquid outlet end of the first distributor is located just above the bladeless area in the middle of the impeller.

4. The intelligent continuous production and processing equipment for acidified oil according to claim 3 is characterized in that: The raw material premixing conveying system includes a first raw material conveying system, a second raw material conveying system, and a premixing conveying system. The first raw material conveying system includes a raw material storage tank, a first material conveying pump, a first electric valve, and a first flow meter. A first conveying pipeline is arranged at the discharge port of the raw material storage tank. The first material conveying pump, the first electric valve, and the first flow meter are arranged on the first conveying pipeline from upstream to downstream in sequence. The second raw material conveying system includes a sulfuric acid tank, a second material conveying pump, a second electric valve, and a second flow meter. A second conveying pipeline is arranged at the discharge port of the sulfuric acid tank. The second material conveying pump, the second electric valve, and the second flow meter are arranged on the second conveying pipeline from upstream to downstream in sequence. The premixing conveying system includes a third conveying pipeline and a shear pump. The first conveying pipeline and the second conveying pipeline are connected in parallel with the feed end of the third conveying pipeline. The discharge end of the third conveying pipeline is connected with the feed end of the first distributor. The shear pump is arranged on the third conveying pipeline. The first material conveying pump, the first electric valve, the first flow meter, the second material conveying pump, the second electric valve, the second flow meter and the shear pump are electrically connected to the PLC controller.

5. The intelligent continuous production and processing equipment for acidified oil according to claim 4 is characterized in that A pre-storage mixing box is arranged on the third delivery pipeline and is located upstream of the shear pump.

6. The intelligent continuous production and processing equipment for acidified oil according to claim 4 is characterized in that: A gas delivery pipeline is arranged between the feed inlet of the volute and the gas outlet end of the gas-liquid separator.

7. The intelligent continuous production and processing equipment for acidified oil according to claim 6 is characterized in that: The steam delivery system includes a steam delivery pipeline, which is connected to the gas delivery pipeline. A third electric valve and a third flow meter are arranged on the steam delivery pipeline in sequence from upstream to downstream. A temperature sensor is arranged on the side wall of the liquid phase discharge end at the lower part of the gas-liquid separator. The third electric valve, the third flow meter and the temperature sensor are electrically connected to the PLC controller.

8. The intelligent continuous production and processing equipment for acidified oil according to claim 7 is characterized in that: The reaction product delivery system includes a fourth delivery pipeline, a buffer tank, and a third material delivery pump. The fourth delivery pipeline realizes the connection between the liquid outlet end of the gas-liquid separator and the vertical sedimentation tank. The buffer tank and the third material delivery pump are arranged on the fourth delivery pipeline in sequence from upstream to downstream.

9. The intelligent continuous production and processing equipment for acidified oil according to claim 8, characterized in that An acidified oil outlet, an oil residue outlet and an acidified water outlet are respectively arranged in the upper area, the middle area and the bottom area of ​​the vertical settling tank, a first online density meter is arranged below the acidified oil outlet, a second online density meter is arranged below the oil residue outlet, a third online density meter is arranged above the acidified water outlet and the third online density meter is located below the second online density meter, the acidified oil delivery system comprises an acidified oil delivery pipeline, a fourth electric valve and an oil storage tank, the acidified oil delivery pipeline realizes the through connection between the acidified oil outlet and the oil storage tank, and the fourth electric valve is arranged on the acidified oil delivery pipeline; the oil residue delivery system comprises an oil residue delivery pipeline; The oil residue conveying pipeline realizes the connection between the oil residue outlet and the oil residue pool. The fifth electric valve is arranged on the oil residue conveying pipeline. The acidified water conveying system comprises an acidified water conveying pipeline, a sixth electric valve and a fourth material conveying pump. The acidified water conveying pipeline realizes the connection between the raw material storage pool and the acidified water outlet. The sixth electric valve and the fourth material conveying pump are sequentially connected in series on the acidified oil conveying pipeline from upstream to downstream. The first online density meter, the second online density meter, the third online density meter, the fourth electric valve, the fifth electric valve, the sixth electric valve and the fourth material conveying pump are electrically connected to the PLC controller.

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