Cleaning device of biodiesel byproduct glycerol decolorizing filter

Abstract

The utility model discloses a cleaning device of a biodiesel byproduct glycerol decoloration filter. A material overflow pipe is arranged at the upper part of the filter, and a high-pressure nitrogen inlet pipe is arranged on the material overflow pipe; the material feeding pipe is arranged at the bottom of the filter, and the discharging pipe is connected to the backflow transfer tank from the material feeding pipe; the finished product discharge pipe is arranged at the lower part of the filter; the material return pipe is connected to the return transfer tank from the finished product discharge pipe; the steam inlet pipe is arranged on the material overflow pipe; an inlet pipeline of the water-cooling calandria condenser is connected with a finished product discharge pipe, and an outlet pipeline is connected to the recovery tank; and all the pipelines are provided with valves. The glycerol decolorizing filter is simple in structure and convenient and efficient to operate, can obviously reduce the glycerol content on a filter cake when the filter press is cleaned, solves the problem of high glycerol loss when a biodiesel byproduct glycerol decolorizing filter in the prior art is cleaned, and reduces the treatment difficulty of a subsequent activated carbon filter cake while improving the product yield.

Description

Technical Field

[0001] The utility model relates to the technical field of biodiesel by-product glycerol production devices, and particularly relates to a cleaning device for a decolorization filter after crude glycerol from biodiesel by-products is purified into refined glycerol. Background Art

[0002] When producing biodiesel from waste animal and vegetable oils, the glycerol content in its by-product crude glycerol is 65%-70%. The crude glycerol is evaporated to remove water after acidification separation and alkalization neutralization, and then refined glycerol with a content of 95.0%-98.0% and a color (Hazen) of 110 # -150 # is obtained through vacuum distillation. The refined glycerol is decolorized by adding 2‰-3‰ of activated carbon in a stirring decolorization tank, and finally the activated carbon with pigments is filtered out by a filter to obtain finished glycerol with a content between 95.0%-98.0% and a color (Hazen) ≤ 75 # After the filter filters 5-6 times, the filtered activated carbon will form an activated carbon filter cake. Since a large amount of pigments adhere to the filter cake and the pigments are even in a saturated state, the decolorization effect will be seriously affected. At this time, the filter needs to be cleaned to remove the filter cake.

[0003] The filter filtration and cleaning operations in the prior art are as follows:

[0004] As Figure 1 shown, the refined glycerol from the distillation tower enters the filter 7 after being decolorized in the stirring decolorization tank, passes through the filter plate and then discharges the material to the reflux transfer tank 8 through the material reflux pipe 5. The material in the reflux transfer tank 8 is pumped back to the decolorization stirring tank by a pump. After the material in the return discharge pipe 5 no longer contains activated carbon, the material reflux pipe 5 is closed, and the finished product discharge pipe 6 is switched to discharge the material. After 5-6 filtrations, the color (Hazen) of the finished glycerol will no longer meet the requirements. At this time, the finished product discharge pipe 6 is closed, the high-pressure nitrogen feed pipe 2 is opened, and then the discharge pipe 4 is opened to discharge the material in the filter. While discharging the material, the material reflux pipe 5 is opened to half, and most of the glycerol attached to the filter cake is discharged while discharging the oil. When all the material in the filter is discharged, the discharge pipe 4 is closed and the material reflux pipe 5 is closed; when the pressure in the filter reaches 0.4 MPa, the material reflux pipe 5 is opened to use the high-speed air flow to carry out the glycerol attached to the filter cake; when the pressure in the filter drops to 0.2 MPa, the material reflux pipe 5 is closed; after repeating the blowing and washing operation 10-15 times, all valves except the bottom valve of the filter are closed, and then the top valve of the filter is opened for conventional cleaning.

[0005] The above cleaning method first empties the material in the filter through the discharge pipe, then uses high-pressure nitrogen to carry out the glycerol adhering to the activated carbon cake, and then dries the cake; since the viscosity of high-concentration glycerol is greatly affected by temperature, when the temperature drops to a certain extent, the atomization effect of the high-pressure air flow on glycerol will become poor. Therefore, when using this method to clean the filter, the glycerol content on the final cake is still as high as 55%-65%. It can be seen that each cleaning will cause a large amount of glycerol loss. Therefore, it is necessary to design a new filter cleaning structure to reduce the glycerol content attached to the cake after drying and reduce the glycerol loss during filter cleaning. Summary of the Invention

[0006] The purpose of the present utility model is to provide a cleaning device for a biodiesel by-product glycerol decolorization filter that is simple in structure, convenient and efficient in operation, and can significantly reduce the glycerol content on the cake during filter cleaning, solve the problem of large glycerol loss during the cleaning of the biodiesel by-product glycerol decolorization filter in the prior art, and reduce the treatment difficulty of the subsequent activated carbon cake while improving the product yield.

[0007] To achieve the above purpose, the cleaning device for the biodiesel by-product glycerol decolorization filter of the present utility model includes a material overflow pipe 1, a high-pressure nitrogen inlet pipe 2, a material feed pipe 3, a discharge pipe 4, a material return pipe 5, a finished product discharge pipe 6, a filter 7, a return transfer tank 8, a steam inlet pipe 9, a water-cooled row pipe condenser 10 and a recovery tank 11; the material overflow pipe 1 is arranged on the upper part of the filter 7, and the high-pressure nitrogen inlet pipe 2 is arranged thereon; the material feed pipe 3 is arranged at the bottom of the filter 7, and the discharge pipe 4 is connected from the material feed pipe 3 to the return transfer tank 8; the finished product discharge pipe 6 is arranged at the lower part of the filter, and the material return pipe 5 is connected from the finished product discharge pipe 6 to the return transfer tank 8; the steam inlet pipe 9 is arranged on the material overflow pipe 1; the inlet pipe of the water-cooled row pipe condenser 10 is connected to the finished product discharge pipe 6, and the outlet pipe is connected to the recovery tank 11; all pipes are provided with valves.

[0008] The above cleaning device for the biodiesel by-product glycerol decolorization filter has the following technical features and beneficial effects by adding a steam feed branch pipe and installing a condenser at the material port:

[0009] 1. The dry oil content attached to the activated carbon cake after filter cleaning is reduced, and the product yield is improved.

[0010] 2. The utilization rate of the steam generated by the distillation tower is improved, and the energy consumption is reduced.

[0011] 3. The whole device is simple in structure, convenient and efficient in operation. Brief Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of a cleaning device for a biodiesel by-product glycerol decolorization filter in the prior art.

[0013] Figure 2 It is a schematic structural diagram of the cleaning device for the by-product glycerol decolorization filter of the present utility model for biodiesel.

[0014] Reference numerals: material overflow pipe 1, high-pressure nitrogen inlet pipe 2, material feed pipe 3, discharge pipe 4, material return pipe 5, finished product discharge pipe 6, filter 7, return transfer tank 8, steam inlet pipe 9, water-cooled row pipe condenser 10, recovery tank 11. Specific embodiments

[0015] The following further details the specific embodiments of the cleaning device for the by-product glycerol decolorization filter of the present utility model with reference to the drawings.

[0016] Figure 2 As shown, the cleaning device for the by-product glycerol decolorization filter of the present utility model includes a material overflow pipe 1, a high-pressure nitrogen inlet pipe 2, a material feed pipe 3, a discharge pipe 4, a material return pipe 5, a finished product discharge pipe 6, a filter 7, a return transfer tank 8, a steam inlet pipe 9, a water-cooled row pipe condenser 10, and a recovery tank 11; the material overflow pipe 1 is arranged above the filter 7, and the high-pressure nitrogen inlet pipe 2 is arranged thereon; the material feed pipe 3 is arranged at the bottom of the filter 7, and the discharge pipe 4 is connected from the material feed pipe 3 to the return transfer tank 8; the finished product discharge pipe 6 is arranged below the filter, and the material return pipe 5 is connected from the finished product discharge pipe 6 to the return transfer tank 8; the steam inlet pipe 9 is arranged on the material overflow pipe 1; the inlet pipe of the water-cooled row pipe condenser 10 is connected to the finished product discharge pipe 6, and the outlet pipe is connected to the recovery tank 11; all pipes are provided with valves.

[0017] The filtering and cleaning operations of the filter of the cleaning device for the by-product glycerol decolorization filter of the present utility model are as follows:

[0018] The refined glycerol from the distillation column enters the filter 7 through the material feed pipe 3 after being decolorized in the stirring decolorization tank. After being filtered by the filter plate, it is discharged through the material reflux pipe 5 to the reflux transfer tank 8. A pump is used to pump the material in the reflux tank 8 back to the decolorization stirring tank. When the material in the material reflux pipe 5 no longer contains activated carbon, the material reflux pipe 5 is closed, and the discharge is switched to the finished product discharge pipe 6. After 5 to 6 filtrations, when the color (Hazen) of the finished glycerol no longer meets the production requirements, the high-pressure nitrogen feed pipe 2 is opened, and the discharge pipe 4 is opened. The material in the filter 7 is discharged through the discharge pipe 4 to the reflux transfer tank 8, and a pump is used to pump the material in the reflux transfer tank 8 back to the decolorization stirring tank; while discharging, the outlet of the water-cooled drain pipe condenser 10 is opened to half, and most of the glycerol attached to the filter cake is discharged to the recovery tank 11 while discharging the oil, and the material in the recovery tank 11 is pumped back to the crude glycerol storage tank for reprocessing. When the material in the filter is discharged, the discharge pipe 4 is closed, and the outlet of the water-cooled drain pipe condenser 10 is closed. When the pressure in the filter reaches 0.4 MPa, the outlet of the water-cooled drain pipe condenser 10 is opened, and the high-pressure nitrogen inlet pipe 2 is closed. The glycerol attached to the filter cake is carried out by the high-speed air flow. After the pressure in the filter returns to normal pressure, the steam inlet pipe 9 is opened, and the filter is blown with high-temperature steam for 3 minutes and then the steam inlet pipe 9 is closed. After repeating the blowing operation 5 to 8 times, all valves except the bottom valve of the filter are closed, and then the top valve of the filter is opened for conventional cleaning.

[0019] The utility model improves the glycerol recovery rate by adding a steam feed branch pipe to alternately and repeatedly blow and wash the filter after discharging the material with high-pressure nitrogen and steam. The steam is used for blowing and washing to reduce the viscosity of the glycerol attached to the filter plate, and then the atomization effect of the high-pressure nitrogen is used to carry out the glycerol attached to the filter cake. Finally, because using this method will cause the air flow temperature at the outlet to become higher during blowing and washing, a condenser is installed at the material outlet to condense the high-temperature air flow.

Claims

1. A cleaning device for a decolorization filter of biodiesel by-product glycerol, which comprises a material overflow pipe (1), a high-pressure nitrogen inlet pipe (2), a material feed pipe (3), a discharge pipe (4), a material reflux pipe (5), a finished product discharge pipe (6), a filter (7), a reflux transfer tank (8) and a recovery tank (11), and valves are provided on all pipes; the material overflow pipe (1) is arranged at the upper part of the filter (7), and the high-pressure nitrogen inlet pipe (2) is arranged thereon; the material feed pipe (3) is arranged at the bottom of the filter (7), and the discharge pipe (4) is connected from the material feed pipe (3) to the reflux transfer tank (8); the finished product discharge pipe (6) is arranged at the lower part of the filter, and the material reflux pipe (5) is connected from the finished product discharge pipe (6) to the reflux transfer tank (8); characterized in that: It also includes a steam inlet pipe (9) and a water-cooled row-pipe condenser (10); the steam inlet pipe (9) is arranged on the material overflow pipe (1); the inlet pipe of the water-cooled row-pipe condenser (10) is connected to the finished product discharge pipe (6), and the outlet pipe is connected to the recovery tank (11).

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