An ultra-low sulfur pure biodiesel production device and method

Abstract

This invention relates to an ultra-low sulfur pure biodiesel production equipment and method, belonging to the field of pure biodiesel production technology. It includes a modular support, with a pretreatment cylinder at the top of the modular support. The pretreatment cylinder has a feeding port at its top, and a cyclone centrifuge at its outlet. A feed pipe is fixedly connected to the outer wall of the cyclone centrifuge via a connecting pump. One end of the feed pipe is fixedly connected to a main dehydration and desulfurization tower. The invention's first and second conversion plates allow for switching between the main and auxiliary dehydration and desulfurization towers based on the adsorbent's lifespan when raw materials are transported to the main dehydration and desulfurization tower via the feed pipe. This prevents production stagnation caused by disassembling and replacing the adsorbent in a single dehydration and desulfurization tower, thus ensuring the continuity of raw material processing and reducing processing efficiency.

Description

Technical Field

[0001] This invention relates to biofuels, and more specifically to the field of pure biodiesel production technology, and more specifically to an ultra-low sulfur pure biodiesel production equipment and method. Background Technology

[0002] Ultra-low sulfur pure biodiesel is a type of biofuel. Biodiesel is a mixed fatty acid methyl ester produced by reacting waste animal and vegetable oils with methanol under the action of a catalyst. It can be mixed with petrochemical diesel for combustion in engines, thus playing a role in environmental protection and emission reduction.

[0003] In the prior art, a production equipment for ultra-low sulfur biodiesel, with announcement number CN107254361A, is a two-stage processing device, including a two-stage purification unit, a two-stage enzymatic reaction unit, and a two-stage distillation unit and a vacuum distillation unit. This invention is green and environmentally friendly, and efficiently and thoroughly removes sulfur-containing impurities from the raw materials; it eliminates the attack of sulfur-containing groups on fatty acids in the synthesis process, providing sufficient conditions for obtaining ultra-low sulfur content methyl esters in the product stage.

[0004] However, while the aforementioned biodiesel production equipment can effectively produce biodiesel, its modular integrated processing of pretreatment, reaction, separation, deep desulfurization, and refining of biodiesel is not very efficient. Furthermore, the production process often relies on a single methanol delivery pipe and a single dehydration and desulfurization tower. The continuous switching between two sets of methanol delivery pipes and the dehydration and desulfurization tower is ineffective. When the adsorbent in the dehydration and desulfurization tower needs to be replaced, the tower stops processing biodiesel, causing the modularly designed equipment to be shut down. This affects the continuity of biodiesel production, reduces production efficiency, and fails to meet user needs. Therefore, we propose an ultra-low sulfur pure biodiesel production equipment and method. Summary of the Invention

[0005] To address the problems mentioned in the background, this invention provides an ultra-low sulfur pure biodiesel production equipment and method. This addresses the issues raised in the background art, such as the low efficiency of modular integrated processing of diesel fuel on the equipment (pretreatment-reaction-separation-deep desulfurization-refining), the poor effectiveness of continuous switching between two sets of methanol delivery pipes and the dehydration and desulfurization tower, and the resulting disruption to biodiesel production continuity when the adsorbent in the dehydration and desulfurization tower needs to be replaced.

[0006] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0007] An ultra-low sulfur pure biodiesel production device includes a modular support. A pretreatment cylinder is installed on the top of the modular support. A feed port is installed on the top of the pretreatment cylinder. A cyclone centrifuge is installed at the outlet of the pretreatment cylinder. A feed pipe is fixedly connected to the outer wall of the cyclone centrifuge via a connecting pump. A main dehydration and desulfurization tower is fixedly connected to one end of the feed pipe. A fixed-bed reactor is installed at the outlet of the main dehydration and desulfurization tower. A glycerol settling separator is installed at the outlet of the fixed-bed reactor. A methanol distillation tower is installed at the outlet of the glycerol settling separator. A multi-stage adsorption tower is installed at the outlet of the methanol distillation tower. A distillation tower is installed at the outlet of the multi-stage adsorption tower.

[0008] The outer wall of the conveying pipe is provided with a conversion mechanism, which includes a first conversion plate and a second conversion plate;

[0009] The fixed-bed reactor has a connecting pipe fixedly connected to its outer wall. One end of the connecting pipe is fixedly connected to a secondary dehydration and desulfurization tower located on one side of the main dehydration and desulfurization tower. A control box is installed on the outer wall of the feed pipe. A connecting shaft is rotatably connected to the inner wall of the control box. A diversion pipe is fixedly connected to the outer wall of the feed pipe and is also fixedly connected to the outer wall of the secondary dehydration and desulfurization tower. One end of the connecting shaft is fixedly connected to a first conversion plate located inside the diversion pipe. A first sealing ring that fits against the outer wall of the first conversion plate is fixedly connected to the inner wall of the diversion pipe. The inner wall of the control box rotates... A rotating shaft is connected, and one end of the rotating shaft is fixedly connected to a second conversion plate located inside the conveying pipe. The outer wall of the second conversion plate is fitted with a second sealing ring that is fixedly connected to the inner wall of the conveying pipe. When the raw material is conveyed to the main dehydration and desulfurization tower through the conveying pipe, the operating status of the main dehydration and desulfurization tower and the auxiliary dehydration and desulfurization tower are switched according to the service life of the adsorbent in the main dehydration and desulfurization tower. This prevents the raw material production from stopping when the adsorbent in a single dehydration and desulfurization tower is disassembled and replaced, which would affect the continuity of raw material production and processing and reduce the efficiency of raw material production and processing.

[0010] Preferably, the top of the main dehydration and desulfurization tower is connected to a methanol vapor delivery pipe via a pump, and the outer wall of the methanol vapor delivery pipe is fixedly connected to a connecting pipe that is fixedly connected to the top of the auxiliary dehydration and desulfurization tower. The interior of the pretreatment cylinder is connected to a stirring rod via a motor, and a heating chamber is provided inside the pretreatment cylinder.

[0011] Preferably, the outer wall of the methanol vapor conveying pipe and the connecting pipe is also provided with a control box, and the interior of the methanol vapor conveying pipe and the connecting pipe is also provided with a first conversion plate and a second conversion plate.

[0012] Preferably, the outer wall of the control box is provided with a servo motor, the output end of the servo motor is fixedly connected to a threaded rod that is threadedly connected to the outer wall of the threaded sliding tooth plate, and the outer wall of the threaded sliding tooth plate is engaged with a connecting gear that is fixedly connected to one end of the connecting shaft.

[0013] Preferably, the rotation center of the connecting gear and the rotation center of the connecting shaft are set to coincide, and the inner wall of the control box and the connection part of the threaded sliding tooth plate are provided with a telescopic groove.

[0014] Preferably, a pull rod is rotatably connected to the outer wall of the threaded sliding tooth plate, and one end of the pull rod is rotatably connected to a connecting sliding tooth plate that is slidably connected to the inner wall of the control box. A connecting gear that is fixedly connected to one end of the rotating shaft is engaged with the outer wall of the connecting sliding tooth plate. An installation mechanism is provided inside the main dehydration and desulfurization tower.

[0015] Preferably, the installation mechanism includes a connecting rod and a plug rod. A first adsorbent is installed inside the main dehydration and desulfurization tower, and a second adsorbent located below the first adsorbent is installed inside the main dehydration and desulfurization tower. A connecting plate is fixedly connected to the inner wall of the main dehydration and desulfurization tower, and an electric push rod is provided on the outer wall of the connecting plate. A connecting rod is fixedly connected to one end of the electric push rod, and a plug rod that inserts into the bottom of the first adsorbent is fixedly connected to the outer wall of the connecting rod. A slot is provided at the connection point between the bottom of the first adsorbent and the plug rod. A tower door body is rotatably connected to the outer wall of the main dehydration and desulfurization tower.

[0016] Preferably, the first adsorbent is a solid acid catalyst, the second adsorbent is a Ni-Mo adsorbent, and two sets of insert rods are provided, with the positions of the two sets of insert rods symmetrical about the central axis of the connecting rod.

[0017] Preferably, the multi-stage adsorption tower is provided with a third adsorbent, and a fourth adsorbent is provided below the third adsorbent. The bottom of the distillation tower is provided with a distillation heating seat. The outer wall of the distillation heating seat is fixedly connected to a recovery pipe via a connecting pump. One end of the recovery pipe is fixedly connected to a drying box. The outer wall of the drying box is fixedly connected to a reflux pipe that communicates with the heating chamber inside the pretreatment cylinder.

[0018] The third adsorbent is a deep desulfurizing agent, and the fourth adsorbent is activated clay.

[0019] A method for producing ultra-low sulfur pure biodiesel includes the following steps:

[0020] Step S1: The raw materials to be produced are put into a pretreatment cylinder equipped with a stirring and heating system for pretreatment. After pretreatment, the raw materials are conveyed to a cyclone centrifuge to remove solid particles, phospholipids and colloids. The raw materials after preliminary impurity removal are conveyed to the main dehydration and desulfurization tower through a conveying pipe for esterification reaction and sulfide adsorption treatment. With the setting of the conversion mechanism, the raw materials are continuously converted through the main dehydration and desulfurization tower and the auxiliary dehydration and desulfurization tower for continuous processing.

[0021] Step S2: The raw materials after esterification reaction and sulfide adsorption treatment are transported to a fixed-bed reactor, and under the action of methanol input and heterogeneous solidified alkaline catalyst in the methanol vapor conveying pipe, the raw materials undergo ester exchange reaction. After the reaction, the raw materials are transported to a glycerol settling separator and a methanol distillation column for glycerol separation and primary purification processing.

[0022] Step S3: The raw materials after separation and primary purification are transported to a multi-stage adsorption tower to polish the biodiesel in order to further remove sulfur, pigments, oxides and polar substances from the raw materials.

[0023] Step S4: After polishing the raw material, it is further transported to the distillation column above the distillation heating seat to distill and separate the impurities carried in the raw material, and high-purity biodiesel is obtained after separation.

[0024] Compared with the prior art, the beneficial effects of this invention are as follows:

[0025] 1. The first and second conversion plates of this invention can switch the operating status of the main dehydration and desulfurization tower and the auxiliary dehydration and desulfurization tower according to the service life of the adsorbent in the main dehydration and desulfurization tower when the raw materials are transported to the main dehydration and desulfurization tower through the conveying pipe. This prevents the raw material production from stopping when the adsorbent in a single dehydration and desulfurization tower is disassembled and replaced, which would affect the continuity of raw material production and processing and reduce the efficiency of raw material production and processing.

[0026] 2. The connecting gear and the connecting gear in this invention, when it is necessary to switch the operating state of the main dehydration and desulfurization tower and the auxiliary dehydration and desulfurization tower, activate the servo motor. Through the rotation of the threaded rod, the threaded sliding tooth plate slides along the inner wall of the control box, and drives the connecting shaft fixedly connected to the rotation center of the connecting gear to rotate. This causes the first conversion plate to flip and close on the inner wall of the diversion pipe. At the same time, the sliding of the threaded sliding tooth plate is connected by the rotation of the pull rod, which drives the connecting sliding tooth plate to slide. This drives the second conversion plate fixedly connected to the rotation center of the connecting gear to open and flip along the inner wall of the conveying pipe, so that the conveying pipe can be connected to the main dehydration and desulfurization tower. Meanwhile, under the control box set on the outer wall of the methanol vapor conveying pipe and the connecting pipe, the methanol conveying path is switched synchronously, so that the methanol conveying path is used in conjunction with the operating state of the dehydration and desulfurization tower.

[0027] 3. When the adsorbent in the dehydration and desulfurization tower needs to be disassembled and replaced, in order to improve the efficiency of the adsorbent disassembly and replacement, the tower door body is opened and the electric push rod is driven to drive the insertion rod fixedly connected to the connecting rod to move downward, so that the insertion rod slides out of the slot and the adsorbent is pulled out from the dehydration and desulfurization tower for quick disassembly and replacement.

[0028] 4. The reflux pipe of this invention can, when the distillation tower is heated by the distillation heating seat, perform drying and recovery of the heat generated in the distillation heating seat to improve the multi-functional utilization of heat resources. The connecting pump outside the recovery pipe is opened so that the heat is transferred to the drying box for drying and then transferred to the heating chamber in the pretreatment cylinder through the reflux pipe to perform synchronous heating of the raw materials in the pretreatment, thereby improving the resource utilization rate of the production equipment for diesel processing. Attached Figure Description

[0029] Figure 1 This is a 3D physical image of an ultra-low sulfur pure biodiesel production equipment and method according to the present invention;

[0030] Figure 2 This is a schematic diagram of the overall front view of the present invention;

[0031] Figure 3 This is a schematic diagram of the overall side view structure of the present invention;

[0032] Figure 4 This is a schematic diagram of the internal structure of the main dehydration and desulfurization tower of the present invention;

[0033] Figure 5 This is a schematic diagram of the location distribution structure of the auxiliary dehydration and desulfurization tower of the present invention;

[0034] Figure 6 This is a schematic diagram of the connection structure between the material conveying pipe and the distribution pipe of the present invention;

[0035] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the diagram;

[0036] Figure 8 This is a schematic diagram of the positional distribution structure of the first and second conversion plates of the present invention;

[0037] Figure 9 This is a schematic diagram of the electric actuator position distribution structure of the present invention;

[0038] Figure 10 For the present invention Figure 9 Enlarged structural diagram at point B in the diagram;

[0039] Figure 11 This is a schematic diagram of the internal structure of the multi-stage adsorption tower of the present invention.

[0040] The labels in the attached diagram are:

[0041] 1. Modular support; 2. Pretreatment cylinder; 3. Feed port; 4. Cyclone centrifuge; 5. Feed pipe; 6. Main dehydration and desulfurization tower; 7. Fixed bed reactor; 8. Glycerol settling separator; 9. Methanol distillation tower; 10. Multistage adsorption tower; 11. Distillation tower; 12. Distillation heating seat; 13. Conversion mechanism; 1301. Control box; 1302. Diverter pipe; 1303. Secondary dehydration and desulfurization tower; 1304. Connecting pipe; 1305. Connecting pipe; 1306. Servo motor; 1307. Threaded rod; 1308. Threaded sliding toothed plate; 1309. Connecting gear; 1310. Connecting shaft; 1311. First conversion plate; 1312, First sealing ring; 1313, Pulling rod; 1314, Connecting sliding toothed plate; 1315, Connecting gear; 1316, Rotating shaft; 1317, Second conversion plate; 1318, Second sealing ring; 14, Methanol vapor conveying pipe; 15, First adsorbent; 16, Second adsorbent; 17, Installation mechanism; 1701, Electric push rod; 1702, Connecting rod; 1703, Insert rod; 1704, Slot; 1705, Tower gate body; 18, Heterogeneous solidified alkaline catalyst; 19, Recovery pipe; 20, Drying box; 21, Return pipe; 22, Third adsorbent; 23, Fourth adsorbent; 24, Connecting plate. Detailed Implementation

[0042] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0043] Example: Please refer to Figures 1 to 11The present invention provides an ultra-low sulfur pure biodiesel production equipment and method, including a modular support 1, a pretreatment cylinder 2 at the top of the modular support 1, a feeding port 3 at the top of the pretreatment cylinder 2, a cyclone centrifuge 4 at the outlet of the pretreatment cylinder 2, a conveying pipe 5 fixedly connected to the outer wall of the cyclone centrifuge 4 via a connecting pump, a main dehydration and desulfurization tower 6 fixedly connected to one end of the conveying pipe 5, a fixed bed reactor 7 at the outlet of the main dehydration and desulfurization tower 6, a glycerol settling separator 8 at the outlet of the fixed bed reactor 7, a methanol distillation tower 9 at the outlet of the glycerol settling separator 8, a multi-stage adsorption tower 10 at the outlet of the methanol distillation tower 9, and a distillation tower 11 at the outlet of the multi-stage adsorption tower 10.

[0044] The outer wall of the conveying pipe 5 is provided with a conversion mechanism 13, which includes a first conversion plate 1311 and a second conversion plate 1317.

[0045] A connecting pipe 1304 is fixedly connected to the outer wall of the fixed bed reactor 7. One end of the connecting pipe 1304 is fixedly connected to a secondary dehydration and desulfurization tower 1303 located on one side of the main dehydration and desulfurization tower 6. A control box 1301 is installed on the outer wall of the feed pipe 5. A connecting shaft 1310 is rotatably connected to the inner wall of the control box 1301. A diversion pipe 1302, which is fixedly connected to the outer wall of the secondary dehydration and desulfurization tower 1303, is fixedly connected to the outer wall of the feed pipe 5. One end of the connecting shaft 1310 is fixedly connected to a diversion pipe 1302 located on the outer wall of the diversion pipe 1303. The first conversion plate 1311 inside the 02 is fixedly connected to the inner wall of the diversion pipe 1302 with a first sealing ring 1312 that fits against the outer wall of the first conversion plate 1311. The inner wall of the control box 1301 is rotatably connected to a rotating shaft 1316. One end of the rotating shaft 1316 is fixedly connected to a second conversion plate 1317 located inside the conveying pipe 5. The outer wall of the second conversion plate 1317 is fitted with a second sealing ring 1318 that is fixedly connected to the inner wall of the conveying pipe 5. When it is necessary to adjust the main dehydration and desulfurization tower 6 and When switching the operating state of the auxiliary dehydration and desulfurization tower 1303, the servo motor 1306 is turned on, and the rotation of the threaded rod 1307 drives the threaded sliding toothed plate 1308 to slide along the inner wall of the control box 1301. This drives the connecting shaft 1310, which is fixedly connected to the rotation center of the connecting gear 1309, to rotate. This causes the first conversion plate 1311 to flip and close on the inner wall of the diversion pipe 1302. At the same time, the sliding of the threaded sliding toothed plate 1308 is connected to the rotation of the pull rod 1313, which drives the connecting sliding toothed plate 1314 to slide. This drives the second conversion plate 1317, which is fixedly connected to the rotation center of the connecting gear 1315, to open and flip along the inner wall of the conveying pipe 5. This allows the conveying pipe 5 to connect with the main dehydration and desulfurization tower 6. Meanwhile, under the control box 1301 located on the outer wall of the methanol vapor conveying pipe 14 and the connecting pipe 1305, the methanol conveying path is switched synchronously, and the methanol conveying path is used in conjunction with the operating state of the dehydration and desulfurization tower.

[0046] like Figure 4 and Figure 5 As shown, the top of the main dehydration and desulfurization tower 6 is equipped with a methanol vapor transmission pipe 14 connected to a pump. The outer wall of the methanol vapor transmission pipe 14 is fixedly connected to a connecting pipe 1305 that is fixedly connected to the top of the auxiliary dehydration and desulfurization tower 1303. The interior of the pretreatment cylinder 2 is connected to a stirring rod via a motor, and the interior of the pretreatment cylinder 2 is equipped with a heating chamber. This facilitates the synchronous switching of the methanol transmission path through the methanol vapor transmission pipe 14 and the connecting pipe 1305.

[0047] like Figure 4 As shown, a control box 1301 is also provided on the outer wall of the methanol vapor conveying pipe 14 and the connecting pipe 1305, and a first conversion plate 1311 and a second conversion plate 1317 are also provided inside the methanol vapor conveying pipe 14 and the connecting pipe 1305. This facilitates the switching of the conveying path of the methanol vapor conveying pipe 14 and the connecting pipe 1305 through the control box 1301 provided on the outer wall of the methanol vapor conveying pipe 14 and the connecting pipe 1305.

[0048] like Figure 7 As shown, a servo motor 1306 is provided on the outer wall of the control box 1301. The output end of the servo motor 1306 is fixedly connected to a threaded rod 1307 that is threadedly connected to the outer wall of the threaded sliding toothed plate 1308. A connecting gear 1309 that is fixedly connected to one end of the connecting shaft 1310 is engaged on the outer wall of the threaded sliding toothed plate 1308. This facilitates the convenient flipping and use of the first conversion plate 1311 through the setting of the threaded sliding toothed plate 1308 and the connecting gear 1309.

[0049] like Figure 7 and Figure 8 As shown, the rotation center of the connecting gear 1309 and the rotation center of the connecting shaft 1310 are set to coincide with each other. The inner wall of the control box 1301 and the connection part of the threaded sliding tooth plate 1308 are provided with a telescopic groove, which is beneficial to achieve the effect of sliding limit of the threaded sliding tooth plate 1308 by means of the telescopic groove at the connection part of the inner wall of the control box 1301 and the threaded sliding tooth plate 1308.

[0050] like Figure 7 As shown, a pull rod 1313 is rotatably connected to the outer wall of the threaded sliding toothed plate 1308. One end of the pull rod 1313 is rotatably connected to a connecting sliding toothed plate 1314 that is slidably connected to the inner wall of the control box 1301. A connecting gear 1315 that is fixedly connected to one end of the rotating shaft 1316 is engaged with the outer wall of the connecting sliding toothed plate 1314. An installation mechanism 17 is provided inside the main dehydration and desulfurization tower 6, which is beneficial to achieve the effect of driving the second conversion plate 1317 to rotate by setting the connecting sliding toothed plate 1314 and the connecting gear 1315.

[0051] like Figure 9 and Figure 10 As shown, the installation mechanism 17 includes a connecting rod 1702 and an insert rod 1703. A first adsorbent 15 is installed inside the main dehydration and desulfurization tower 6, and a second adsorbent 16 located below the first adsorbent 15 is also installed inside the main dehydration and desulfurization tower 6. A connecting plate 24 is fixedly connected to the inner wall of the main dehydration and desulfurization tower 6, and an electric push rod 1701 is provided on the outer wall of the connecting plate 24. One end of the electric push rod 1701 is fixedly connected to the connecting rod 1702, and an insert rod 1703, which is inserted into the bottom of the first adsorbent 15, is fixedly connected to the outer wall of the connecting rod 1702. A slot 1704 is provided at the bottom of the main dehydration and desulfurization tower 6 where it connects to the insertion rod 1703. The main dehydration and desulfurization tower 6 is rotatably connected to the tower door body 1705. When it is necessary to disassemble and replace the adsorbent in the dehydration and desulfurization tower, in order to improve the efficiency of the adsorbent engagement, disassembly and replacement, the tower door body 1705 is opened and the electric push rod 1701 is driven to drive the insertion rod 1703, which is fixedly connected to the connecting rod 1702, to move downward, so that the insertion rod 1703 slides out from the slot 1704 and the adsorbent is pulled out from the dehydration and desulfurization tower for quick engagement, disassembly and replacement.

[0052] like Figure 9 As shown, the first adsorbent 15 is made of solid acid catalyst, the second adsorbent 16 is made of Ni-Mo adsorbent, and two sets of insert rods 1703 are provided. The positions of the two sets of insert rods 1703 are symmetrical about the central axis of the connecting rod 1702, which is conducive to achieving the effect of esterification reaction and adsorption of organic sulfides on the raw materials through the setting of the first adsorbent 15 being made of solid acid catalyst and the second adsorbent 16 being made of Ni-Mo adsorbent.

[0053] like Figure 3 and Figure 11 As shown, a third adsorbent 22 is provided inside the multi-stage adsorption tower 10, and a fourth adsorbent 23 located below the third adsorbent 22 is provided inside the multi-stage adsorption tower 10. A distillation heating seat 12 is provided at the bottom of the distillation tower 11. A recovery pipe 19 is fixedly connected to the outer wall of the distillation heating seat 12 through a connecting pump. A drying box 20 is fixedly connected to one end of the recovery pipe 19. A reflux pipe 21 connected to the heating chamber inside the pretreatment cylinder 2 is fixedly connected to the outer wall of the drying box 20.

[0054] The third adsorbent 22 is made of deep desulfurizing agent, and the fourth adsorbent 23 is made of activated clay. The combination of the materials of the third adsorbent 22 (deep desulfurizing agent) and the fourth adsorbent 23 (activated clay) is beneficial for polishing raw materials, improving the efficiency of heat energy recovery and utilization in production equipment, and reducing energy consumption of equipment.

[0055] A method for producing ultra-low sulfur pure biodiesel includes the following steps:

[0056] Step S1: The raw materials to be produced are put into the pretreatment cylinder 2 equipped with a stirring and heating system for pretreatment. After pretreatment, the raw materials are conveyed to the cyclone centrifuge 4 to discharge solid particles, phospholipids and colloids in the raw materials. The raw materials after preliminary impurity removal are conveyed to the main dehydration and desulfurization tower 6 through the conveying pipe 5 for esterification reaction and sulfide adsorption treatment. With the setting of the conversion mechanism 13, the raw materials are continuously converted through the main dehydration and desulfurization tower 6 and the auxiliary dehydration and desulfurization tower 1303 to carry out continuous processing of the raw materials.

[0057] Step S2: The raw materials after esterification reaction and sulfide adsorption treatment are transported to the fixed bed reactor 7, and under the action of methanol input through methanol vapor conveying pipe 14 and heterogeneous solidified alkaline catalyst 18, the raw materials undergo ester exchange reaction. After the reaction, the raw materials are transported to glycerol settling separator 8 and methanol distillation column 9 respectively for glycerol separation and primary purification processing.

[0058] Step S3: The raw materials after separation and primary purification are transported to the multi-stage adsorption tower 10 to polish the biodiesel in order to further remove sulfur, pigments, oxides and polar substances from the raw materials.

[0059] Step S4: After polishing the raw material, it is further transported to the distillation column 11 above the distillation heating seat 12 to distill and separate the impurities carried in the raw material, and high-purity biodiesel is obtained after separation.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An ultra-low sulphur pure biodiesel production plant comprising a modular support (1), characterized by the fact that: The modular support (1) is provided with a pretreatment cylinder (2) at the top, and a feed port (3) is provided at the top of the pretreatment cylinder (2). A cyclone centrifuge (4) is provided at the outlet of the pretreatment cylinder (2). A feed pipe (5) is fixedly connected to the outer wall of the cyclone centrifuge (4) through a connecting pump. A main dehydration and desulfurization tower (6) is fixedly connected to one end of the feed pipe (5). A fixed bed reactor (7) is provided at the outlet of the main dehydration and desulfurization tower (6). A glycerol settling separator (8) is provided at the outlet of the fixed bed reactor (7). A methanol distillation tower (9) is provided at the outlet of the glycerol settling separator (8). A multi-stage adsorption tower (10) is provided at the outlet of the methanol distillation tower (9). A distillation tower (11) is provided at the outlet of the multi-stage adsorption tower (10). The outer wall of the conveying pipe (5) is provided with a conversion mechanism (13), which includes a first conversion plate (1311) and a second conversion plate (1317). The fixed bed reactor (7) is fixedly connected to a connecting pipe (1304) on its outer wall. One end of the connecting pipe (1304) is fixedly connected to a secondary dehydration and desulfurization tower (1303) located on one side of the main dehydration and desulfurization tower (6). A control box (1301) is provided on the outer wall of the feed pipe (5). A connecting shaft (1310) is rotatably connected to the inner wall of the control box (1301). A diversion pipe (1302) is fixedly connected to the outer wall of the feed pipe (5) and fixedly connected to the outer wall of the secondary dehydration and desulfurization tower (1303). One end of the connecting shaft (1310) is fixedly connected to... There is a first conversion plate (1311) located inside the diversion pipe (1302). The inner wall of the diversion pipe (1302) is fixedly connected to a first sealing ring (1312) that fits against the outer wall of the first conversion plate (1311). The inner wall of the control box (1301) is rotatably connected to a rotating shaft (1316). One end of the rotating shaft (1316) is fixedly connected to a second conversion plate (1317) located inside the conveying pipe (5). The outer wall of the second conversion plate (1317) is fitted with a second sealing ring (1318) that is fixedly connected to the inner wall of the conveying pipe (5). The multi-stage adsorption tower (10) is provided with a third adsorbent (22) inside, and a fourth adsorbent (23) located below the third adsorbent (22) is provided inside the multi-stage adsorption tower (10). The bottom of the distillation tower (11) is provided with a distillation heating seat (12). The outer wall of the distillation heating seat (12) is fixedly connected to a recovery pipe (19) via a connecting pump. One end of the recovery pipe (19) is fixedly connected to a drying box (20). The outer wall of the drying box (20) is fixedly connected to a reflux pipe (21) that communicates with the heating chamber inside the pretreatment cylinder (2). The material of the third adsorbent (22) is a deep desulfurizing agent, and the material of the fourth adsorbent (23) is activated clay; The outer wall of the control box (1301) is provided with a servo motor (1306). The output end of the servo motor (1306) is fixedly connected to a threaded rod (1307) that is threadedly connected to the outer wall of the threaded sliding toothed plate (1308). The outer wall of the threaded sliding toothed plate (1308) is engaged with a connecting gear (1309) that is fixedly connected to one end of the connecting shaft (1310). The outer wall of the threaded sliding toothed plate (1308) is rotatably connected to a pull rod (1313). One end of the pull rod (1313) is rotatably connected to a connecting sliding toothed plate (1314) that is slidably connected to the inner wall of the control box (1301). The outer wall of the connecting sliding toothed plate (1314) is engaged with a connecting gear (1315) that is fixedly connected to one end of the rotating shaft (1316).

2. An ultra-low sulphur pure biodiesel production plant as claimed in claim 1, wherein: The top of the main dehydration and desulfurization tower (6) is connected to a methanol vapor delivery pipe (14) via a pump. The outer wall of the methanol vapor delivery pipe (14) is fixedly connected to a connecting pipe (1305) that is fixedly connected to the top of the auxiliary dehydration and desulfurization tower (1303). The interior of the pretreatment cylinder (2) is connected to a stirring rod via a motor, and a heating chamber is provided inside the pretreatment cylinder (2).

3. An ultra-low sulphur pure biodiesel production plant as claimed in claim 2, wherein: The outer walls of the methanol vapor conveying pipe (14) and the connecting pipe (1305) are also provided with control boxes (1301), and the interiors of the methanol vapor conveying pipe (14) and the connecting pipe (1305) are also provided with a first conversion plate (1311) and a second conversion plate (1317).

4. The ultra-low sulfur pure biodiesel production equipment according to claim 1, characterized in that: The rotation center of the connecting gear (1309) and the rotation center of the connecting shaft (1310) are set to coincide with each other, and the inner wall of the control box (1301) and the connection part of the threaded sliding tooth plate (1308) are provided with a telescopic groove.

5. The ultra-low sulfur pure biodiesel production equipment according to claim 1, characterized in that: The main dehydration and desulfurization tower (6) is equipped with an installation mechanism (17), which includes a connecting rod (1702) and an insert rod (1703). The main dehydration and desulfurization tower (6) is equipped with a first adsorbent (15) and a second adsorbent (16) located below the first adsorbent (15). The inner wall of the main dehydration and desulfurization tower (6) is fixedly connected to a connecting plate (24). The outer wall of the connecting plate (24) is equipped with an electric push rod (1701). One end of the electric push rod (1701) is fixedly connected to a connecting rod (1702). The outer wall of the connecting rod (1702) is fixedly connected to an insert rod (1703) that is inserted into the bottom of the first adsorbent (15). The bottom of the first adsorbent (15) and the connection part of the insert rod (1703) are provided with a slot (1704). The outer wall of the main dehydration and desulfurization tower (6) is rotatably connected to a tower door body (1705).

6. The ultra-low sulfur pure biodiesel production equipment according to claim 5, characterized in that: The first adsorbent (15) is made of solid acid catalyst, and the second adsorbent (16) is made of Ni-Mo adsorbent. There are two sets of insert rods (1703), and the positions of the two sets of insert rods (1703) are symmetrical about the central axis of the connecting rod (1702).

7. The method for producing ultra-low sulfur pure biodiesel using the ultra-low sulfur pure biodiesel production equipment according to any one of claims 1-6, characterized in that, Includes the following steps: Step S1: The raw materials to be produced are put into the pretreatment cylinder (2) equipped with a stirring and heating system for pretreatment. After pretreatment, the raw materials are transported to the cyclone centrifuge (4) to discharge the solid particles, phospholipids and colloids in the raw materials. The raw materials after preliminary impurity removal are transported to the main dehydration and desulfurization tower (6) through the feed pipe (5) for esterification reaction and sulfide adsorption treatment. Under the setting of the conversion mechanism (13), the raw materials are continuously converted through the main dehydration and desulfurization tower (6) and the auxiliary dehydration and desulfurization tower (1303) to carry out continuous processing of the raw materials. Step S2: The raw material after esterification reaction and sulfide adsorption treatment is transported to the fixed bed reactor (7), and under the action of methanol input through methanol vapor transport pipe (14) and heterogeneous solidified alkaline catalyst (18), the raw material undergoes ester exchange reaction. After the reaction, the raw material is transported to the glycerol settling separator (8) and methanol distillation column (9) respectively for glycerol separation and primary purification processing. Step S3: After separation and primary purification, the raw material is transported to a multi-stage adsorption tower (10) to polish the biodiesel in order to further remove sulfur, pigments, oxides and polar substances from the raw material. Step S4: After polishing the raw material, it is further transported to the distillation tower (11) above the distillation heating seat (12) to distill and separate the impurities carried in the raw material, and obtain high-purity biodiesel after separation.

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