Waste animal and plant grease pretreatment method and system

Abstract

The invention discloses a waste animal and plant grease pretreatment method and system, and solves the technical problems of low effective conversion rate of hydrogen, large loss and serious resource waste in the process of removing nitrogen, phosphorus, sulfur and chlorine in waste animal and plant grease in the prior art. The method comprises the following steps: sequentially carrying out water washing, vacuum suction filtration and ultrasonic treatment on the waste animal and plant grease, reacting with ethanolamine, adjusting the pH value, and finally carrying out vacuum suction filtration again. According to the method disclosed by the invention, nitrogen, phosphorus, sulfur and chlorine in other molecular structures in the waste animal and plant grease are converted and removed in a mode of combining ultrasonic waves and ethanolamine, so that the conversion rate of ethanolamine is high, and the loss is relatively small; compared with a method for removing nitrogen, phosphorus, sulfur and chlorine in other molecular structures in the waste animal and vegetable oil by hydrogenation in the waste animal and vegetable oil, the method disclosed by the invention has the advantage of less resource waste. The system provides a continuous pretreatment device for the method disclosed by the invention, and ensures the feasibility of pretreating the waste animal and vegetable oil.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste animal and vegetable oil pretreatment, and in particular relates to a waste animal and vegetable oil pretreatment method and system. Background Art

[0002] After processing and refining, waste animal and vegetable oils and fats can be used as bio-jet fuel raw materials. In order to improve the quality of the finished products after processing and refining, the waste animal and vegetable oils and fats need to be pretreated before processing and refining to reduce or remove nitrogen, phosphorus, sulfur, chlorine and other components in the waste animal and vegetable oils and fats. Nitrogen, phosphorus, sulfur and chlorine exist in three forms in waste animal and vegetable oils and fats: one is in the form of inorganic matter, the second is in a colloidal state, and the third is in other molecular structures. Based on the three forms of nitrogen, phosphorus, sulfur and chlorine in waste animal and vegetable oils and fats, the existing technology for removing nitrogen, phosphorus, sulfur and chlorine from waste animal and vegetable oils and fats is as follows: first, use water washing to remove nitrogen, phosphorus, sulfur and chlorine in the form of inorganic matter in the waste animal and vegetable oils and fats; then use vacuum filtration to remove the colloidal matter in the waste animal and vegetable oils and fats; and finally, hydrogenate the waste animal and vegetable oils and fats to remove nitrogen, phosphorus, sulfur and chlorine in other molecular structures in the waste animal and vegetable oils and fats. In the process of removing nitrogen, phosphorus, sulfur and chlorine from waste animal and plant oils by adding hydrogen to waste animal and plant oils, it is necessary to maintain a pressure of 2-3 MPa and a temperature above 200 degrees Celsius. A large amount of methane, ethane and carbon dioxide are generated, the effective conversion rate of hydrogen is low, the loss is large, and the waste of resources is relatively serious. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for pretreating waste animal and vegetable oils and fats, so as to solve the technical problems in the prior art of removing nitrogen, phosphorus, sulfur and chlorine from waste animal and vegetable oils and fats, such as low effective conversion rate of hydrogen, large loss and serious waste of resources.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows: A method for pretreating waste animal and vegetable oils and fats, comprising the following steps: Step 1: preheating waste animal and vegetable oils; Step 2, washing the preheated waste animal and vegetable oils with water; Step 3: vacuum filtering the washed waste animal and vegetable oils to obtain the waste animal and vegetable oils after removing the colloid; Step 4, ultrasonically treating the waste animal and vegetable oils after removing the colloid; Step 5: Add 0.1% ethanolamine to the ultrasonically treated waste animal and vegetable oils and fats, and react for 1.8-2.2 hours to obtain a reaction mixture at a reaction temperature of 55-65° C. Step 6: Add 50% formic acid to the reaction mixture obtained in step 5 and adjust the pH to 6-7; Step 7, vacuum filtering the reaction mixture after adjusting the pH; Step 8: transport the waste animal and vegetable oils and fats after vacuum filtration in step 7 to the next processing step.

[0005] Furthermore, in step 1, the temperature of the waste animal and vegetable oils after preheating is 60-70°C.

[0006] Furthermore, step 2 includes: Step 21: Prepare clean water and heat it to 65-80°C; Step 22: Stirring and mixing the heated clean water and the preheated waste animal and vegetable oils to obtain a water-washed mixed solution, wherein the stirring time is 10-15 minutes, the stirring intensity is 100-200 r / min, and the clean water content is 5%-8% of the mass of the waste animal and vegetable oils; Step 23, standing the water-washed mixed solution obtained in step 22 until the water and oil layers are separated, the standing time is 15-20 minutes, and the standing temperature is 50-70°C; Step 24: Separate the water and oil separated in step 23 to obtain washed waste animal and vegetable oils.

[0007] Furthermore, in step 3, the washed waste animal and plant oils are filtered multiple times using white clay to obtain waste animal and plant oils after colloid removal; in step 7, the pH-adjusted reaction mixture is filtered multiple times using white clay.

[0008] Furthermore, in step 4, the ultrasonic treatment of the waste animal and vegetable oils after gelatin removal is carried out for 5-10 minutes at a temperature of 60-80°C.

[0009] A system for pretreating waste animal and vegetable oils and fats, comprising an oil heating tank for preheating the waste animal and vegetable oils and fats, a water heating tank for heating clean water, a water washing mechanism connected from the oil heating tank and the water heating tank for washing the preheated waste animal and vegetable oils and fats with water, a first vacuum filtration mechanism connected from the water washing mechanism for vacuum filtering the washed waste animal and vegetable oils and fats, an ultrasonic treatment mechanism connected from the first vacuum filtration mechanism for treating the waste animal and vegetable oils and fats after gelatin removal, a reaction tank connected from the ultrasonic treatment mechanism for reacting the ultrasonically treated waste animal and vegetable oils and fats with 0.1% ethanolamine, a pH adjustment tank connected from the reaction tank for adjusting the pH of the reaction mixture, and a second vacuum filtration mechanism connected from the pH adjustment tank for vacuum filtering the pH-adjusted reaction mixture.

[0010] Furthermore, the water washing mechanism includes a water washing tank connected to the oil heating tank and the water heating tank, and a sedimentation tank connected to the first vacuum filtration mechanism. A first heater is provided in the oil heating tank, a second heater is provided in the water heating tank, a first motor is provided on the top of the water washing tank, a first stirring paddle connected to the first motor is provided in the water washing tank, a first stirring paddle is provided on the first stirring paddle, and an insulation sleeve is provided on the outer wall of the sedimentation tank.

[0011] Furthermore, the first vacuum filtration mechanism includes a first filter tank connected from the water washing mechanism and connected to the ultrasonic processing mechanism, and a first vacuum pump connected from the first filter tank; the first filter tank is provided with a first filter bag that divides the interior of the first filter tank into a first oil containing chamber and a first vacuum chamber, and the first vacuum pump is connected from the first vacuum chamber.

[0012] Furthermore, the ultrasonic processing mechanism includes an ultrasonic processing tank, a heating rod arranged in the ultrasonic processing tank, a spiral tube spirally wound around the heating rod and connected from the first vacuum filtration mechanism, an ultrasonic generator arranged outside the ultrasonic processing tank, and an ultrasonic catheter arranged on the ultrasonic processing tank and connected from the ultrasonic generator for introducing ultrasonic waves into the interior of the ultrasonic processing tank.

[0013] Furthermore, the second vacuum filtration mechanism includes a second filter tank connected from the ultrasonic processing mechanism and connected to the next processing step, and a second vacuum pump connected from the second filter tank; the second filter tank is provided with a second filter bag that divides the interior of the second filter tank into a second oil-containing chamber and a second vacuum chamber, and the second vacuum pump is connected from the second vacuum chamber.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for pretreating waste animal and vegetable oils and fats, which first removes nitrogen, phosphorus, sulfur, and chlorine in the form of inorganic substances in the waste animal and vegetable oils and fats by water washing, then further filters the washed waste animal and vegetable oils and fats by vacuum filtration to remove colloid in the waste animal and vegetable oils and fats, and then treats the waste animal and vegetable oils and fats after the colloid is removed by ultrasonic wave to break the molecular structure of nitrogen, phosphorus, sulfur, and chlorine in the waste animal and vegetable oils and fats, so that the nitrogen, phosphorus, sulfur, and chlorine are free in the waste animal and vegetable oils and fats, and then uses ethanolamine to react with the free nitrogen, phosphorus, sulfur, and chlorine to generate new compounds to obtain a reaction mixture, and then uses formic acid to adjust the reaction mixture. The pH value of the product is reduced to 6-7, and finally the new compounds containing nitrogen, phosphorus, sulfur and chlorine in the reaction mixture are filtered out by vacuum filtration. The nitrogen, phosphorus, sulfur and chlorine in the waste animal and vegetable oils pretreated by the method of the present invention are effectively reduced, which is convenient for subsequent processing of the waste animal and vegetable oils. The method of the present invention utilizes a combination of ultrasound and ethanolamine to convert and remove nitrogen, phosphorus, sulfur and chlorine present in other molecular structures in the waste animal and vegetable oils. The conversion rate of ethanolamine is high and the loss is small. Compared with the method of hydrogenating the waste animal and vegetable oils to remove nitrogen, phosphorus, sulfur and chlorine present in other molecular structures in the waste animal and vegetable oils, the method of the present invention wastes less resources.

[0015] The present invention also provides a system for pretreating waste animal and vegetable oils, which is suitable for the pretreatment method. The system provides a continuous pretreatment device for the method, ensuring the feasibility of pretreating waste animal and vegetable oils. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the system of the present invention.

[0017] The names corresponding to the reference numerals are: 1-Oil heating tank, 2-Water heating tank, 3-Reaction tank, 4-PH adjustment tank, 5-Water washing tank, 6-Sedimentation tank, 7-First delivery pipe, 8-First solenoid valve, 9-First delivery pump, 10-Second delivery pipe, 11-Third delivery pipe, 12-Fourth delivery pipe, 13-Second delivery pump, 14-Second solenoid valve, 15-Third solenoid valve, 16-Fifth delivery pipe, 17-Sixth delivery pipe, 18-Seventh delivery pipe, 19-Third delivery pump, 20-Fourth delivery pump , 21-fifth delivery pump, 22-first heater, 23-second heater, 24-first motor, 25-first stirring paddle, 26-first stirring blade, 27-insulation sleeve, 28-first filter tank, 29-first vacuum pump, 31-first oil chamber, 32-first vacuum chamber, 30-first filter bag, 33-ultrasonic treatment tank, 34-heating rod, 35-spiral tube, 36-ultrasonic generator, 37-ultrasonic catheter, 38-second filter tank, 39-second vacuum Empty pump, 40-second oil storage chamber, 41-second vacuum chamber, 42-second filter bag, 43-oil delivery pipe, 44-first exhaust pipe, 45-water delivery pipe, 46-second exhaust pipe, 47-third exhaust pipe, 48-first circulation pipe, 49-eighth delivery pipe, 50-sixth delivery pump, 51-fourth solenoid valve, 52-fifth solenoid valve, 53-fourth exhaust pipe, 54-fifth exhaust pipe, 55-ninth delivery pipe, 56-seventh delivery pump, 57-second motor, 58- Second stirring paddle, 59-second stirring blade, 60-ethanolamine input pipe, 61-third heater, 62-tenth delivery pipe, 63-eighth delivery pump, 64-sixth solenoid valve, 65-formic acid input pipe, 66-third motor, 67-third stirring paddle, 68-third stirring blade, 69-eleventh delivery pipe, 70-ninth delivery pump, 71-second circulation pipe, 72-twelfth delivery pipe, 73-tenth delivery pump, 74-seventh solenoid valve, 75-eighth solenoid valve. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; of course, they may also refer to mechanical connections or electrical connections; in addition, they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0021] The present invention provides a method for pretreating waste animal and vegetable oils, comprising the following steps: Step 1: preheating waste animal and vegetable oils; Step 2, washing the preheated waste animal and vegetable oils with water; Step 3: vacuum filtering the washed waste animal and vegetable oils to obtain the waste animal and vegetable oils after removing the colloid; Step 4, ultrasonically treating the waste animal and vegetable oils after removing the colloid; Step 5: Add 0.1% ethanolamine to the ultrasonically treated waste animal and vegetable oils and fats, and react for 1.8-2.2 hours to obtain a reaction mixture at a reaction temperature of 55-65° C. Step 6: Add 50% formic acid to the reaction mixture obtained in step 5 and adjust the pH to 6-7; Step 7, vacuum filtering the reaction mixture after adjusting the pH; Step 8: transport the waste animal and vegetable oils and fats after vacuum filtration in step 7 to the next processing step.

[0022] In step 1, the temperature of the waste animal and vegetable oils after preheating is 60-70°C.

[0023] Step 2 includes: Step 21: Prepare clean water and heat it to 65-80°C; Step 22: Stirring and mixing the heated clean water and the preheated waste animal and vegetable oils to obtain a water-washed mixed solution, wherein the stirring time is 10-15 minutes, the stirring intensity is 100-200 r / min, and the clean water content is 5%-8% of the mass of the waste animal and vegetable oils; Step 23, standing the water-washed mixed solution obtained in step 22 until the water and oil layers are separated, the standing time is 15-20 minutes, and the standing temperature is 50-70°C; Step 24: Separate the water and oil separated in step 23 to obtain washed waste animal and vegetable oils.

[0024] In step 3, the washed waste animal and vegetable oils are filtered multiple times using white clay to obtain the waste animal and vegetable oils after colloid removal; in step 7, the pH-adjusted reaction mixture is filtered multiple times using white clay.

[0025] In step 4, the ultrasonic treatment of the waste animal and vegetable oils after gelatin removal is carried out for 5-10 minutes at a temperature of 60-80°C.

[0026] Preheating waste animal and vegetable oils reduces their viscosity, facilitating subsequent mixing with water during washing. It also facilitates the transfer of impurities from the waste oils into the water, improving the washing efficiency. Washing waste oils removes nitrogen, phosphorus, sulfur, and chlorine in the form of inorganic salts, as well as some colloids.

[0027] The waste animal and vegetable oils after washing are vacuum filtered to remove the residual water in the waste animal and vegetable oils, and to adsorb and remove the remaining colloid in the waste animal and vegetable oils.

[0028] After washing and vacuum filtration, some nitrogen, phosphorus, sulfur, and chlorine remain in the waste animal and vegetable oils. These nitrogen, phosphorus, sulfur, and chlorine are present in other molecular structures in the waste animal and vegetable oils. At this time, ultrasonic treatment of the waste animal and vegetable oils can break down the molecular structures containing nitrogen, phosphorus, sulfur, and chlorine in the waste animal and vegetable oils, freeing the nitrogen, phosphorus, sulfur, and chlorine in the waste animal and vegetable oils. Ethanolamine at a concentration of 0.1% is added to the waste animal and vegetable oils after ultrasonic treatment. Ethanolamine can combine with the free nitrogen, phosphorus, sulfur, and chlorine to form new compounds, and a reaction mixture can be obtained. The reaction mixture is alkaline. Formic acid at a concentration of 50% is added to the reaction mixture for neutralization, and the pH of the reaction mixture can be adjusted to 6-7. The reaction mixture after pH adjustment is vacuum filtered to remove the new nitrogen, phosphorus, sulfur, and chlorine compounds generated in the reaction mixture. The nitrogen, phosphorus, sulfur, and chlorine in the waste animal and vegetable oils pretreated by the method of the present invention are effectively reduced, which is beneficial for the subsequent further processing of the waste animal and vegetable oils.

[0029] like Figure 1 As shown, the present invention provides a waste animal and vegetable oil pretreatment system, comprising an oil heating tank 1 for preheating waste animal and vegetable oil, a water heating tank 2 for heating clean water, a water washing mechanism connected from the oil heating tank 1 and the water heating tank 2 for washing the preheated waste animal and vegetable oil, a first vacuum filtration mechanism connected from the water washing mechanism for vacuum filtering the washed waste animal and vegetable oil, an ultrasonic treatment mechanism connected from the first vacuum filtration mechanism for treating the waste animal and vegetable oil after gelatin removal, a reaction tank 3 connected from the ultrasonic treatment mechanism for reacting the ultrasonically treated waste animal and vegetable oil with ethanolamine at a concentration of 0.1%, a pH adjustment tank 4 connected from the reaction tank 3 for adjusting the pH of the reaction mixture, and a second vacuum filtration mechanism connected from the pH adjustment tank 4 for vacuum filtering the reaction mixture after pH adjustment.

[0030] The water washing mechanism includes a water washing tank 5 connected to the oil heating tank 1 and the water heating tank 2, and a sedimentation tank 6 connected to the water washing tank 5 and connected to the first vacuum filtration mechanism; A first heater 22 is provided in the oil heating tank 1, a second heater 23 is provided in the water heating tank 2, a first motor 24 is provided on the top of the water washing tank 5, a first stirring paddle 25 connected to the first motor 24 is provided in the water washing tank 5, a first stirring paddle 26 is provided on the first stirring paddle 25, and an insulation sleeve 27 is provided on the outer wall of the sedimentation tank 6.

[0031] A first delivery pipe 7 is connected between the oil heating tank 1 and the water washing tank 5. The first delivery pipe 7 is provided with a first solenoid valve 8 and a first delivery pump 9 in sequence along its delivery direction. A second delivery pipe 10 is connected to the bottom of the sedimentation tank 6, and a third delivery pipe 11 and a fourth delivery pipe 12 are connected to the second delivery pipe 10. The third delivery pipe 11 and the fourth delivery pipe 12 are respectively provided with a second solenoid valve 14 and a third solenoid valve 15. The fourth delivery pipe 12 is provided with a second delivery pump 13. The output end of the third delivery pipe 11 is connected to the first delivery pipe 7 and is located between the first solenoid valve 8 and the first delivery pump 9. The fourth delivery pipe 12 is connected to an external sewage treatment site. A fifth delivery pipe 16 is connected between the water heating tank 2 and the water washing tank 5, a sixth delivery pipe 17 is connected between the water washing tank 5 and the sedimentation tank 6, a seventh delivery pipe 18 is connected between the sedimentation tank 6 and the first vacuum filtration mechanism, a third delivery pump 19 is provided on the fifth delivery pipe 16, a fourth delivery pump 20 is provided on the sixth delivery pipe 17, and a fifth delivery pump 21 is provided on the seventh delivery pipe 18.

[0032] The oil heating tank 1 is provided with an oil delivery pipe 43 and a first exhaust pipe 44, while the water heating tank 2 is provided with a water delivery pipe 45 and a second exhaust pipe 46. The waste animal and vegetable oils to be preheated are added to the oil heating tank 1 through the oil delivery pipe 43. The first heater 22 in the oil heating tank 1 heats the added waste animal and vegetable oils until the temperature of the waste animal and vegetable oils reaches 60-70°C. The first solenoid valve 8 is opened, the second solenoid valve 14 is closed, and the first delivery pump 9 is activated. The first delivery pump 9 then delivers the preheated waste animal and vegetable oils in the oil heating tank 1 to the water washing tank 5 through the first delivery pipe 7.

[0033] The clean water to be heated is added to the water heating tank 2 through the water supply pipe 45, and the second heater 23 in the water heating tank 2 heats the added clean water until the clean water temperature rises to 65-80°C. The third delivery pump 19 is turned on, and the third delivery pump 19 inputs the clean water heated in the water heating tank 2 into the water washing tank 5 through the fifth delivery pipe 16. Then, the first motor 24 on the water washing tank 5 is turned on, and the first motor 24 drives the first stirring paddle 25 to rotate. The first stirring paddle 25 drives the first stirring blade 26 to rotate synchronously. The stirring blade 26 stirs the preheated waste animal and plant oils and the heated clean water in the water washing tank 5, so that the preheated waste animal and plant oils and the heated clean water are mixed, so as to achieve the purpose of washing the waste animal and plant oils with clean water.

[0034] The washing tank 5 is provided with a third exhaust pipe 47, through which the water vapor and heated air in the washing tank 5 are discharged. The settling tank 6 is provided with a fourth exhaust pipe 53.

[0035] After washing the waste animal and vegetable oils with clean water, the fourth delivery pump 20 transfers the washed mixture from the washing tank 5 to the settling tank 6 via the sixth delivery pipe 17. The washed mixture is at a temperature of 55-70°C. The washed mixture settles in the settling tank 6 for 15-20 minutes at a temperature of 50-70°C. The settling tank 6 is equipped with an insulation jacket 27 on its outer wall, which insulates the liquid in the settling tank 6, maintaining a temperature of 50-70°C, thus facilitating water-oil stratification. After the oil and water in the settling tank 6 are separated, the fifth delivery pump 21 transfers the separated oil from the settling tank 6 to the first vacuum filtration mechanism via the seventh delivery pipe 18. To drain the water from the settling tank 6, the second solenoid valve 14 is closed, the third solenoid valve 15, and the second delivery pump 13 are opened. The second delivery pump 13 then discharges the water from the settling tank 6 to an external sewage treatment facility via the fourth delivery pipe 12. The remaining water and oil in the settling tank 6 are then transferred to the water washing tank 5 through the third delivery pipe 11 for further water washing. When the remaining water and oil are discharged from the settling tank 6, the second solenoid valve 14 and the first delivery pump 9 are opened, the first solenoid valve 8 and the third solenoid valve 15 are closed, and the first delivery pump 9 pumps the remaining water and oil into the water washing tank 5.

[0036] The first vacuum filtration mechanism includes a first filter canister 28 connected from the water washing mechanism and connected to the ultrasonic processing mechanism, and a first vacuum pump 29 connected from the first filter canister 28. A first filter bag 30 is provided within the first filter canister 28, dividing the interior of the first filter canister 28 into a first oil-containing chamber 31 and a first vacuum chamber 32. The first vacuum pump 29 is connected from the first vacuum chamber 32. The first filter bag 30 contains white clay.

[0037] The first filter tank 28 is connected to the seventh delivery pipe 18. The fifth delivery pump 21 inputs the stratified oil in the sedimentation tank 6 into the first oil storage chamber 31 of the first filter tank 28 through the seventh delivery pipe 18. The first vacuum pump 29 evacuates the first vacuum chamber 32. The oil in the first oil storage chamber 31 passes through the first filter bag 30 and flows into the first vacuum chamber 32. The white clay in the first filter bag 30 filters the oil passing through to remove colloid and residual water in the oil.

[0038] A first circulation pipe 48 is connected to the first filter canister 28, which then connects to the seventh delivery pipe 18. An eighth delivery pipe 49 extends from the first circulation pipe 48, which then connects to the ultrasonic processing mechanism. A sixth delivery pump 50 and a fourth solenoid valve 51 are provided on the first circulation pipe 48. The input end of the eighth delivery pipe 49 is located between the sixth delivery pump 50 and the fourth solenoid valve 51. A fifth solenoid valve 52 is provided on the eighth delivery pipe 49.

[0039] The sixth delivery pump 50 and the fourth solenoid valve 51 are turned on, and the fifth solenoid valve 52 is closed. The oil filtered by the first filter tank 28 is pumped by the sixth delivery pump 50 and enters the first filter tank 28 for filtration again.

[0040] The ultrasonic treatment mechanism includes an ultrasonic treatment tank 33, a heating rod 34 arranged in the ultrasonic treatment tank 33, a spiral tube 35 spirally wound around the heating rod 34 and connected from the first vacuum filtration mechanism, an ultrasonic generator 36 arranged outside the ultrasonic treatment tank 33, and an ultrasonic catheter 37 arranged on the ultrasonic treatment tank 33 and connected from the ultrasonic generator 36 for introducing ultrasonic waves into the interior of the ultrasonic treatment tank 33.

[0041] The eighth delivery pipe 49 is connected to the spiral tube 35. The sixth delivery pump 50 and the fifth solenoid valve 52 are activated, and the fourth solenoid valve 51 is closed. The sixth delivery pump 50 delivers the filtered oil in the first filter canister 28 to the ultrasonic treatment tank 33 for ultrasonic treatment. The ultrasonic treatment tank 33 contains water, which acts as an ultrasonic transmission medium, ensuring that the ultrasonic waves act evenly on the oil in the spiral tube 35.

[0042] The spiral tube 35 is wound around the heating rod 34, and the oil is transported from bottom to top in the spiral tube 35. In this way, the residence time of the oil in the ultrasonic treatment tank 33 can be extended, ensuring that the ultrasonic wave acts on the oil for 5-10 minutes. At the same time, the heating rod 34 heats the oil in the spiral tube 35 and the water in the ultrasonic treatment tank 33 to keep the oil temperature at 60-80°C. The ultrasonic wave acts on the oil at a temperature of 60-80°C for 5-10 minutes. The ultrasonic wave energy breaks the molecular structure of nitrogen, phosphorus, sulfur, and chlorine in the oil, making the nitrogen, phosphorus, sulfur, and chlorine free in the oil.

[0043] The ultrasonic treatment tank 33 is provided with a fifth exhaust pipe 54 .

[0044] A ninth delivery pipe 55 extends from the ultrasonic treatment tank 33 and is equipped with a seventh delivery pump 56. The seventh delivery pump 56 delivers the ultrasonically treated oil in the ultrasonic treatment tank 33 to the reaction tank 3. A second motor 57 is installed at the top of the reaction tank 3. A second stirring paddle 58 connected to the second motor 57 is located inside the reaction tank 3. A second stirring paddle 58 is provided with a second stirring blade 59. An ethanolamine inlet pipe 60 is installed at the top of the reaction tank 3, and a third heater 61 is located inside the reaction tank 3.

[0045] Ethanolamine is introduced into the reaction tank 3 through the ethanolamine inlet pipe 60. The second motor 57 is started, which drives the second stirring paddle 58 to rotate. The second stirring paddle 58 drives the second stirring blade 59 to rotate. The second stirring blade 59 stirs and mixes the oil in the reaction tank 3 and the ethanolamine, so that the ethanolamine combines with the free nitrogen, phosphorus, sulfur, and chlorine in the oil to form new compounds.

[0046] The third heater 61 is used to provide heat for the reaction in the reaction tank 3 , ensuring that the reaction temperature in the reaction tank 3 is 55-65° C., and ensuring that the reaction in the reaction tank 3 proceeds normally.

[0047] A tenth delivery pipe 62 extends from the reaction tank 3 and is equipped with an eighth delivery pump 63 and a sixth solenoid valve 64. The reaction mixture in the reaction tank 3 is fed into the pH adjustment tank 4 via the eighth delivery pump 63 for pH adjustment. The reaction mixture in the reaction tank 3 is alkaline. A formic acid inlet pipe 65 is provided at the top of the pH adjustment tank 4. A third motor 66 is also provided at the top of the pH adjustment tank 4. A third stirring paddle 67 is provided in the pH adjustment tank 4, and a third stirring blade 68 is provided on the third stirring paddle 67. Formic acid is fed into the pH adjustment tank 4 via the formic acid inlet pipe 65. The third motor 66 is activated to rotate the third stirring paddle 67, which in turn rotates the third stirring blade 68. The stirring action of the third stirring blade 68 neutralizes the formic acid with the mixture in the pH adjustment tank 4, bringing the pH to between 6 and 7.

[0048] The pH regulating tank 4 is connected to an eleventh delivery pipe 69, which is provided with a ninth delivery pump 70. The eleventh delivery pipe 69 is connected to a second vacuum filtration mechanism.

[0049] The second vacuum filtration mechanism includes a second filter canister 38 connected from the ultrasonic processing mechanism and fed into the next processing step, and a second vacuum pump 39 connected from the second filter canister 38. A second filter bag 42 is located within the second filter canister 38, dividing the interior of the second filter canister 38 into a second oil-containing chamber 40 and a second vacuum chamber 41. The second vacuum pump 39 is connected from the second vacuum chamber 41. The second filter bag 42 contains clay.

[0050] The second filter tank 38 is connected to the eleventh delivery pipe 69. The ninth delivery pump 70 inputs the pH-adjusted mixture in the pH adjustment tank 4 into the second oil containing chamber 40 of the second filter tank 38 through the eleventh delivery pipe 69. The second vacuum chamber 41 makes the second vacuum chamber 41 evacuated. The mixture in the second oil containing chamber 40 passes through the second filter bag 42 and flows into the second vacuum chamber 41. The white clay in the second filter bag 42 filters the passed mixture to remove new compounds containing nitrogen, phosphorus, sulfur and chlorine in the mixture.

[0051] A second circulation pipe 71 is connected to the second filter canister 38, which then connects to the eleventh delivery pipe 69. A twelfth delivery pipe 72 extends from the second circulation pipe 71 and connects to the next processing step. A tenth delivery pump 73 and a seventh solenoid valve 74 are installed on the second circulation pipe 71. The input end of the twelfth delivery pipe 72 is located between the tenth delivery pump 73 and the seventh solenoid valve 74. An eighth solenoid valve 75 is installed on the twelfth delivery pipe 72.

[0052] The tenth delivery pump 73 and the seventh solenoid valve 74 are opened, and the eighth solenoid valve 75 is closed. The mixture filtered through the second filter canister 38 is pumped by the tenth delivery pump 73 into the second filter canister 38 for multiple filtrations. Subsequently, the tenth delivery pump 73 and the eighth solenoid valve 75 are opened, and the seventh solenoid valve 74 is closed. The tenth delivery pump 73 then delivers the waste animal and vegetable oils obtained after multiple filtrations through the second filter canister 38 to the next processing step. The waste animal and vegetable oils obtained through pretreatment by the present system effectively reduce nitrogen, phosphorus, sulfur, and chlorine.

[0053] The first motor 24 , the second motor 57 and the third motor 66 used in the present invention are all forward and reverse servo motors.

[0054] The present invention includes a first solenoid valve 8, a first delivery pump 9, a second delivery pump 13, a second solenoid valve 14, a third solenoid valve 15, a third delivery pump 19, a fourth delivery pump 20, a fifth delivery pump 21, a first heater 22, a second heater 23, a first motor 24, a first vacuum pump 29, a heating rod 34, an ultrasonic generator 36, a second vacuum pump 39, a sixth delivery pump 50, a fourth solenoid valve 51, a fifth solenoid valve 52, a seventh delivery pump 56, a second motor 57, a third heater 61, an eighth delivery pump 53, and a sixth solenoid valve 6 4. The third motor 66, the ninth delivery pump 70, the tenth delivery pump 73, the seventh solenoid valve 74 and the eighth solenoid valve 75 are all existing known electrical equipment and can be directly purchased and used on the market. The first solenoid valve 8, the first delivery pump 9, the second delivery pump 13, the second solenoid valve 14, the third solenoid valve 15, the third delivery pump 19, the fourth delivery pump 20, the fifth delivery pump 21, the first heater 22, the second heater 23, the first motor 24, the first vacuum pump 29, the heating rod 34, the ultrasonic generator 36, the second vacuum pump 39, The structures, circuits, and control principles of the sixth delivery pump 50, the fourth solenoid valve 51, the fifth solenoid valve 52, the seventh delivery pump 56, the second motor 57, the third heater 61, the eighth delivery pump 53, the sixth solenoid valve 64, the third motor 66, the ninth delivery pump 70, the tenth delivery pump 73, the seventh solenoid valve 74, and the eighth solenoid valve 75 are all existing known technologies. Therefore, regarding the first solenoid valve 8, the first delivery pump 9, the second delivery pump 13, the second solenoid valve 14, the third solenoid valve 15, the third delivery pump 19, the fourth delivery pump 20, The structures, circuits, and control principles of the fifth delivery pump 21, the first heater 22, the second heater 23, the first motor 24, the first vacuum pump 29, the heating rod 34, the ultrasonic generator 36, the second vacuum pump 39, the sixth delivery pump 50, the fourth solenoid valve 51, the fifth solenoid valve 52, the seventh delivery pump 56, the second motor 57, the third heater 61, the eighth delivery pump 53, the sixth solenoid valve 64, the third motor 66, the ninth delivery pump 70, the tenth delivery pump 73, the seventh solenoid valve 74 and the eighth solenoid valve 75 are not described here.

[0055] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention and are intended to illustrate the technical solutions of the present invention, rather than limiting them, and certainly not limiting the patent scope of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features therein may be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention. In other words, any changes or refinements made to the main design concept and spirit of the present invention that have no substantive significance, provided that the technical problems they solve are still consistent with those of the present invention, should be included in the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention to other related technical fields should also be included in the patent protection scope of the present invention.

Claims

1. A method for pretreating waste animal and vegetable oils, characterized in that: The steps include: Step 1: preheating waste animal and vegetable oils; Step 2, washing the preheated waste animal and vegetable oils with water; Step 3: vacuum filtering the washed waste animal and vegetable oils to obtain the waste animal and vegetable oils after removing the colloid; Step 4, ultrasonically treating the waste animal and vegetable oils after removing the colloid; Step 5: Add 0.1% ethanolamine to the ultrasonically treated waste animal and vegetable oils and fats, and react for 1.8-2.2 hours to obtain a reaction mixture at a reaction temperature of 55-65° C. Step 6: Add 50% formic acid to the reaction mixture obtained in step 5 and adjust the pH to 6-7; Step 7, vacuum filtering the reaction mixture after adjusting the pH; Step 8: transport the waste animal and vegetable oils and fats after vacuum filtration in step 7 to the next processing step.

2. The method for pretreating waste animal and vegetable oils according to claim 1, characterized in that: In step 1, the temperature of the waste animal and vegetable oils after preheating is 60-70°C.

3. The method for pretreating waste animal and vegetable oils according to claim 1, characterized in that: Step 2 includes: Step 21: Prepare clean water and heat it to 65-80°C; Step 22: Stirring and mixing the heated clean water and the preheated waste animal and vegetable oils to obtain a water-washed mixed solution, wherein the stirring time is 10-15 minutes, the stirring intensity is 100-200 r / min, and the clean water content is 5%-8% of the mass of the waste animal and vegetable oils; Step 23, standing the water-washed mixed solution obtained in step 22 until the water and oil layers are separated, the standing time is 15-20 minutes, and the standing temperature is 50-70°C; Step 24: Separate the water and oil separated in step 23 to obtain washed waste animal and vegetable oils.

4. The method for pretreating waste animal and vegetable oils according to claim 1, wherein: In step 3, the washed waste animal and vegetable oils are filtered multiple times using white clay to obtain the waste animal and vegetable oils after colloid removal; in step 7, the pH-adjusted reaction mixture is filtered multiple times using white clay.

5. The method for pretreating waste animal and vegetable oils according to claim 1, characterized in that: In step 4, the ultrasonic treatment of the waste animal and vegetable oils after gelatin removal is carried out for 5-10 minutes at a temperature of 60-80°C.

6. A system for pre-treating waste animal and vegetable oils according to any one of claims 1 to 5, characterized in that: The invention comprises an oil heating tank (1) for preheating waste animal and vegetable oils, a water heating tank (2) for heating clean water, a water washing mechanism connected from the oil heating tank (1) and the water heating tank (2) for washing the preheated waste animal and vegetable oils with water, a first vacuum filtration mechanism connected from the water washing mechanism for vacuum filtering the washed waste animal and vegetable oils, an ultrasonic treatment mechanism connected from the first vacuum filtration mechanism for treating the waste animal and vegetable oils after removing colloid, a reaction tank (3) connected from the ultrasonic treatment mechanism for reacting the ultrasonically treated waste animal and vegetable oils with ethanolamine having a concentration of 0.1%, a pH regulating tank (4) connected from the reaction tank (3) for regulating the pH of the reaction mixture, and a second vacuum filtration mechanism connected from the pH regulating tank (4) for vacuum filtering the reaction mixture after the pH is adjusted.

7. The system for pre-treating waste animal and vegetable oils according to claim 6, characterized in that: The water washing mechanism comprises a water washing tank (5) connected from the oil heating tank (1) and the water heating tank (2), and a sedimentation tank (6) connected from the water washing tank (5) and connected to the first vacuum filtration mechanism; The oil heating tank (1) is provided with a first heater (22), the water heating tank (2) is provided with a second heater (23), the top of the water washing tank (5) is provided with a first motor (24), the water washing tank (5) is provided with a first stirring paddle (25) connected to the first motor (24), the first stirring paddle (25) is provided with a first stirring blade (26), and the outer wall of the sedimentation tank (6) is provided with a heat insulation sleeve (27).

8. The system for pre-treating waste animal and vegetable oils according to claim 6, characterized in that: The first vacuum filtration mechanism includes a first filter tank (28) connected from the water washing mechanism and connected to the ultrasonic processing mechanism, and a first vacuum pump (29) connected from the first filter tank (28); a first filter bag (30) is provided in the first filter tank (28) for dividing the interior of the first filter tank (28) into a first oil containing chamber (31) and a first vacuum chamber (32); and the first vacuum pump (29) is connected from the first vacuum chamber (32).

9. The system for pre-treating waste animal and vegetable oils according to claim 6, characterized in that: The ultrasonic treatment mechanism includes an ultrasonic treatment tank (33), a heating rod (34) arranged in the ultrasonic treatment tank (33), a spiral tube (35) spirally wound around the heating rod (34) and connected from the first vacuum filtration mechanism, an ultrasonic generator (36) arranged outside the ultrasonic treatment tank (33), and an ultrasonic catheter (37) arranged on the ultrasonic treatment tank (33) and connected from the ultrasonic generator (36) for introducing ultrasonic waves into the interior of the ultrasonic treatment tank (33).

10. The system for pre-treating waste animal and vegetable oils according to claim 6, characterized in that: The second vacuum filtration mechanism includes a second filter tank (38) connected from the ultrasonic processing mechanism and connected to the next processing step, and a second vacuum pump (39) connected from the second filter tank (38); a second filter bag (42) is provided in the second filter tank (38) for dividing the interior of the second filter tank (38) into a second oil-containing chamber (40) and a second vacuum chamber (41), and the second vacuum pump (39) is connected from the second vacuum chamber (41).

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