A novel biodiesel water washing tower

Abstract

This invention discloses a novel biodiesel washing tower, comprising a tower body with a bottom washing section, a middle washing section, and a top overflow section arranged sequentially from bottom to top. The top overflow section includes an oil layer and an oil-water mixture layer. Based on a traditional washing tower, this invention adds a parallel washing tank and a settling tank. The oil-water mixture layer overflowing from the top overflow layer is extracted through pipelines. The washing tanks are equipped with a stirring motor and impellers to enhance the washing intensity through mechanical stirring. Combined with the replenishment of clean water from a second inlet, this accelerates the removal of saponified substances and catalysts, resulting in a secondary, intensified washing process. This solves the problem of back-mixing caused by water flow impact in the mixing layer within the tower. The two sets of washing tanks are switched alternately via a solenoid valve on the first pipeline to ensure continuous processing capacity. When one set is washing, the other set can be settling or draining oil, avoiding processing interruptions.

Description

Technical Field

[0001] This utility model relates to the technical field of biodiesel water washing equipment, specifically a novel biodiesel water washing tower. Background Technology

[0002] During the biodiesel production process, residual catalysts, such as NaOH or KOH, glycerol, saponifications, methanol, and other impurities, may remain. Crude biodiesel needs to be further washed in a water washing tower to obtain refined biodiesel in order to improve the purity and quality of the final product.

[0003] Currently used biodiesel washing towers are mostly packed towers or sieve plate towers, filled with high-efficiency packing materials such as Raschig rings and Pall rings to increase the gas-liquid contact area. A search revealed a biodiesel washing tower disclosed in patent application publication number CN204529797U. The tower has a crude biodiesel inlet at the bottom, a biodiesel outlet at the top, a washing water outlet at the bottom, and a gas phase outlet at the top. Multiple washing water inlets are evenly distributed along the tower wall from low to high, each connected to a washing water inlet pipe. This biodiesel washing tower has a small footprint, good washing effect, low power consumption, and can achieve continuous production.

[0004] This biodiesel washing tower achieves biodiesel washing by filling multiple layers of packing material inside and using water flow from top to bottom. During the washing process, the biodiesel at the top of the tower will gradually accumulate before reaching the oil outlet. When the washing water flows downward from the top, it will impact the washed biodiesel at the top, causing some of the biodiesel to be pushed back into the wastewater, forming an oil-water mixture at the water-oil interface, which affects the washing efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a novel biodiesel washing tower. In traditional washing towers, the biodiesel washed at the top forms an oil layer and an oil-water mixture layer. By setting up a washing tank that can extract the mixed oil and water and wash it separately, the biodiesel in the oil-water mixture layer is cleaned and allowed to settle before being pumped into a settling tank to settle and separate into layers. This solves the problem of insufficient cleaning efficiency at the oil-water mixture layer mentioned in the background technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a novel biodiesel water washing tower, comprising a water washing tower body, wherein a bottom water washing section, a middle water washing section, and a top overflow section are respectively arranged from bottom to top within the water washing tower body. The top overflow section includes an oil layer and an oil-water mixture layer. The oil-water mixture layer is connected to a water washing tank through a pipeline, which can extract the mixed oil and water and wash it separately. A water washing structure is provided in the water washing tank. The outside of the top overflow section is connected to a settling tank for separating the oil and water through a pipeline.

[0007] The washing tanks are configured as two sets connected in parallel. A first pipeline is provided between the washing tower body and the two sets of washing tanks to control the alternating operation of the two sets of washing tanks. A second pipeline is provided between the settling tank and the two sets of washing tanks to pump the cleaned biodiesel from the washing tanks into the settling tank.

[0008] Preferably, the first pipeline includes a first main pipe, and the exterior of the water washing tower body is provided with a water and oil suction port for connecting the first main pipe. A first suction pump for suctioning mixed oil and water is installed on the first main pipe.

[0009] Preferably, the first pipeline further includes a first branch pipe connected to the first main pipe, the side wall of the washing pool is provided with an oil and water inlet for communicating with the first branch pipe, and a first solenoid valve for controlling the opening and closing of the first branch pipe is installed on the first branch pipe.

[0010] Preferably, the outer wall of the water washing tower body is provided with an overflow port, which is connected to the oil layer and is located above the water-oil suction port.

[0011] Preferably, the outer wall of the settling tank is provided with an overflow inlet and an oil inlet, the oil inlet is located between the overflow inlets, and an oil straight pipe is connected between the overflow inlet and the overflow outlet.

[0012] Preferably, the second pipeline includes a second main pipe, one end of which is connected to an oil inlet, and the other end of which is connected to a second branch pipe. The outer wall of the washing tank is provided with an oil outlet for the second branch pipe to be connected.

[0013] Preferably, a second suction pump is installed on the second main pipe, and a second solenoid valve is installed on the second branch pipe.

[0014] Preferably, the bottom of the washing tank, the settling tank, and the washing tower body are all provided with wastewater outlets, and a waste oil inlet is provided on one side of the bottom end of the washing tower body.

[0015] Preferably, the washing tower body is fixed with a Pall ring packing layer and a washing water distributor, and the washing water distributor is externally connected to a first water inlet for clean water to enter.

[0016] Preferably, the washing structure includes a stirring motor, the output end of which is fixed with a stirring paddle, and a second water inlet for cleaning water is provided on one side of the washing tank.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This utility model, based on a traditional water washing tower, adds a parallel water washing tank and a settling tank. The oil-water mixture overflowing from the top layer is extracted through pipelines. The water washing tank is equipped with a stirring motor and impellers; mechanical stirring enhances the washing intensity. Combined with the replenishment of clean water from the second inlet, this accelerates the removal of saponified substances and catalysts, resulting in a secondary, intensified water washing. This solves the problem of back-mixing in the tower's mixing layer caused by water flow impact.

[0019] 2. The two sets of washing tanks are switched by a solenoid valve on the first pipeline to ensure continuous processing capacity. When one set is washing, the other set can be left to stand or drain oil to avoid interruption of processing. The mixed liquid after washing is pumped into the settling tank through the second pipeline, where it merges with the pure oil layer overflowing from the top of the tower and is set for a second time to further separate residual water and improve the purity of the finished product. Attached Figure Description

[0020] Figure 1 This is a system diagram of the overall invention.

[0021] Figure 2 This is a system diagram of the first and second pipelines of this utility model.

[0022] In the diagram: 1. Washing tower body; 2. Bottom washing section; 3. Middle washing section; 4. Top overflow section; 401. Oil layer; 402. Oil-water mixing layer; 5. Washing tank; 6. Washing structure; 7. Settling tank; 8. First pipeline; 9. Second pipeline; 801. First main pipe; 802. Water and oil suction port; 803. First suction pump; 804. First branch pipe; 805. Oil and water inlet; 806. First solenoid valve; 101 701. Overflow port; 702. Oil inlet; 901. Second main pipe; 902. Second branch pipe; 903. Oil outlet; 904. Second suction pump; 905. Second solenoid valve; 102. Wastewater outlet; 103. Waste oil inlet; 104. Pall ring packing layer; 105. Wash water distributor; 106. First water inlet; 601. Stirring motor; 602. Stirring paddle; 603. Second water inlet. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-2This utility model provides a technical solution: a novel biodiesel water washing tower, including a water washing tower body 1. The water washing tower body 1 is provided with a bottom water washing section 2, a middle water washing section 3 and a top overflow section 4 from bottom to top. The top overflow section 4 includes an oil layer 401 and an oil-water mixing layer 402. The oil-water mixing layer 402 is connected to a water washing tank 5 through a pipeline, which can extract the mixed oil and water and wash it separately. The water washing tank 5 is provided with a water washing structure 6. The outside of the top overflow section 4 is connected to a settling tank 7 for settling and separating oil and water through a pipeline.

[0025] By setting up a washing tank 5 that allows for the extraction and separate washing of the mixed oil and water, repeated mixing of oil and water within the tower is avoided, improving cleaning efficiency and separation speed. A settling tank 7 allows the washed oil layer 401 to settle again, and combined with the direct introduction of pure oil from the top of the tower, the water content of the final product is reduced. This device can incorporate a level sensor and PLC control to automatically start and stop the first suction pump 803 based on the thickness of the mixed layer, or control the first and second solenoid valves to switch between washing tanks 5, further improving efficiency.

[0026] The washing tanks 5 are configured as two sets in parallel. A first pipeline 8 is provided between the washing tower body 1 and the two sets of washing tanks 5 to control the alternating operation of the two sets of washing tanks 5. A second pipeline 9 is provided between the settling tank 7 and the two sets of washing tanks 5 to pump the cleaned biodiesel in the washing tanks 5 into the settling tank 7.

[0027] The first pipeline 8 includes a first main pipe 801. The exterior of the water washing tower body 1 is provided with a water and oil suction port 802 for connecting the first main pipe 801. A first suction pump 803 for suctioning mixed oil and water is installed on the first main pipe 801.

[0028] The first pipeline 8 also includes a first branch pipe 804 connected to the first main pipe 801. The side wall of the washing pool 5 is provided with an oil and water inlet 805 for communicating with the first branch pipe 804. A first solenoid valve 806 for controlling the opening and closing of the first branch pipe 804 is installed on the pipeline of the first branch pipe 804.

[0029] The outer wall of the water washing tower body 1 is provided with an overflow port 101, which is connected to the oil layer 401 and is located above the water and oil suction port 802.

[0030] The outer wall of the settling tank 7 is provided with an overflow inlet 701 and an oil inlet 702. The oil inlet 702 is located between the overflow inlets 701, and the overflow inlets 701 and the overflow outlet 101 are connected by a straight oil pipe.

[0031] like Figure 1As shown, the height of the overflow outlet 101 is set higher than that of the overflow inlet 701, so that the oil layer 401 of the top overflow section 4 flows directly into the settling tank 7 through the overflow outlet 101 under the action of gravity, reducing the amount of mixed layer to be processed.

[0032] The second pipeline 9 includes a second main pipe 901, one end of which is connected to an oil inlet 702, and the other end of which is connected to a second branch pipe 902. The outer wall of the washing pool 5 is provided with an oil outlet 903 for the second branch pipe 902 to be connected.

[0033] A second suction pump 904 is installed on the second main pipe 901, and a second solenoid valve 905 is installed on the second branch pipe 902.

[0034] Wastewater discharge outlets 102 are provided at the bottom of the washing tank 5, the settling tank 7, and the washing tower body 1. A waste oil inlet 103 is provided on one side of the bottom end of the washing tower body 1.

[0035] Wastewater discharge outlets 102 are provided at the bottom of the water washing tower, water washing pool 5, and settling pool 7 to periodically discharge the sedimented waste containing impurities.

[0036] The second suction pump 904 transports the biodiesel purified from the washing tank 5 to the settling tank 7 via the second pipeline 9. The settling tank 7 separates residual water and oil through gravity sedimentation, and the wastewater is discharged from the bottom.

[0037] The main body 1 of the water washing tower is fixed with a Pall ring filling layer 104 and a water washing distributor 105. The water washing distributor 105 is connected to a first water inlet 106 for clean water to enter.

[0038] The first water inlet 106, the Pall ring filling layer 104, and the water washing distributor 105 are all provided with several sets.

[0039] The structure of the Pall ring packing layer 104 and the water washing distributor 105 is the same as that of the Pall ring packing layer 104 and the water washing distributor 105 in a biodiesel water washing tower disclosed in patent application publication number CN204529797U. The high specific surface area and porous structure of the Pall rings cause the oil and water to form turbulence, increase the contact time and mass transfer efficiency, and accelerate the transfer of impurities to the aqueous phase. The water washing distributor 105 is used to uniformly distribute the liquid on the cross-section of the water washing tower body 1.

[0040] The washing structure 6 includes a stirring motor 601, and a stirring paddle 602 is fixed at the output end of the stirring motor 601. A second water inlet 603 for cleaning water to enter is provided on one side of the washing tank 5.

[0041] Inside the washing tank 5, the stirring motor 601 drives the paddle to mix oil and water at high speed, and the second water inlet 603 injects clean water to enhance the removal of impurities.

[0042] In use, in the bottom water washing section 2, biodiesel and wastewater are injected through the bottom waste oil inlet 103, coming into countercurrent contact with clean water. The Pall ring packing layer 104 significantly increases the oil-water contact area, accelerating the transfer of impurities to the aqueous phase.

[0043] Middle layer water washing section 3: The water distributor 105 evenly distributes the clean water. Due to its lower density, the waste oil moves upward to the water surface and flows in the opposite direction to the clean water, washing out the impurities remaining in the waste oil and improving the purification effect.

[0044] Top overflow section 4: The oil-water mixture settles and separates here, with light biodiesel forming the upper oil layer 401 and the denser oil-water mixture layer 402 located below.

[0045] Two sets of washing tanks 5 work alternately through the first pipeline 8: the first main pipe 801 draws out the oil-water mixture through the first suction pump 803 from the oil-water suction port 802. One of the first solenoid valves 806 is closed, and the other first solenoid valve 806 is opened, sending the oil-water mixture into one of the washing tanks 5. The stirring motor 601 in the washing tank 5 drives the paddle to mix the oil and water at high speed. The second water inlet 603 injects clean water to enhance the removal of impurities. When one set is processing the mixed oil-water layer, the other set can be left to stand or drained.

[0046] When the other set of washing tanks 5 is settling, the oil layer 401 floating on the top is opened by the second solenoid valve 905 and the second suction pump 904 of the washing tank 5, flows into the second main pipe 901 through the second branch pipe 902, and enters the settling tank 7 to settle and separate again.

[0047] The settling tank 7 separates residual water and oil by gravity sedimentation, and the wastewater is discharged from the bottom wastewater outlet 102.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel biodiesel wash column characterized in that: The system includes a water washing tower body (1), which is provided with a bottom water washing section (2), a middle water washing section (3) and a top overflow section (4) from bottom to top. The top overflow section (4) includes an oil layer (401) and an oil-water mixing layer (402). The oil-water mixing layer (402) is connected to a water washing tank (5) through a pipeline, which can extract the mixed oil and water and wash it separately. The water washing tank (5) is provided with a water washing structure (6). The outside of the top overflow section (4) is connected to a settling tank (7) for settling and separating oil and water through a pipeline. The washing tanks (5) are configured as two sets in parallel. A first pipeline (8) is provided between the washing tower body (1) and the two sets of washing tanks (5) to control the alternating operation of the two sets of washing tanks (5). A second pipeline (9) is provided between the settling tank (7) and the two sets of washing tanks (5) to pump the cleaned biodiesel in the washing tanks (5) into the settling tank (7).

2. A novel biodiesel washing column as claimed in claim 1, wherein: The first pipeline (8) includes a first main pipe (801), and the outside of the water washing tower body (1) is provided with a water and oil suction port (802) for connecting the first main pipe (801). A first suction pump (803) for suctioning mixed oil and water is installed on the first main pipe (801).

3. A novel biodiesel washing column as claimed in claim 2, wherein: The first pipeline (8) also includes a first branch pipe (804) connected to the first main pipe (801). The side wall of the washing pool (5) is provided with an oil and water inlet (805) for communicating with the first branch pipe (804). A first solenoid valve (806) for controlling the opening and closing of the passage of the first branch pipe (804) is installed on the pipeline of the first branch pipe (804).

4. A novel biodiesel washing column as claimed in claim 3, wherein: The outer wall of the water washing tower body (1) is provided with an overflow port (101), which is connected to the oil layer (401) and is located above the water and oil suction port (802).

5. A novel biodiesel washing column as claimed in claim 4, wherein: The outer wall of the settling tank (7) is provided with an overflow inlet (701) and an oil inlet (702). The oil inlet (702) is located between the overflow inlet (701), and the overflow inlet (701) and the overflow outlet (101) are connected by an oil straight pipe.

6. A novel biodiesel washing column as claimed in claim 1, wherein: The second pipeline (9) includes a second main pipe (901), one end of which is connected to an oil inlet (702), and the other end of which is connected to a second branch pipe (902). The outer wall of the washing pool (5) is provided with an oil outlet (903) for the second branch pipe (902) to be connected.

7. A novel biodiesel washing column as claimed in claim 6, wherein: A second suction pump (904) is installed on the second main pipe (901), and a second solenoid valve (905) is installed on the second branch pipe (902).

8. A novel biodiesel water washing tower according to claim 6, characterized in that: Wastewater discharge outlet (102) is provided at the bottom of the washing tank (5), the settling tank (7) and the washing tower body (1), and waste oil inlet (103) is provided on one side of the bottom end of the washing tower body (1).

9. A novel biodiesel washing column as claimed in claim 1, wherein: The washing tower body (1) is fixed with a Pall ring packing layer (104) and a washing water distributor (105). The washing water distributor (105) is connected to a first water inlet (106) for clean water to enter.

10. A novel biodiesel washing column as claimed in claim 1, wherein: The washing structure (6) includes a stirring motor (601), and a stirring paddle (602) is fixed at the output end of the stirring motor (601). A second water inlet (603) for clean water to enter is provided on one side of the washing tank (5).

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