CN218673274U - Heat recovery device after biodiesel reduced pressure distillation - Google Patents

Abstract

The utility model discloses a heat reclamation device after biodiesel vacuum distillation: the left end and the right end of the heat exchanger cylinder are respectively connected with an end enclosure by flanges; the upper part of the left end enclosure is provided with a hot material inlet, the lower part of the left end enclosure is provided with an outlet, the left end of the left end enclosure is provided with a hand hole, a partition board is horizontally arranged in the left end enclosure, and a detachable distribution disc is arranged on the partition board; a distribution disc is arranged in the right seal head, the top of the distribution disc is flush with the partition plate to form a double-tube pass, and a hot material drain outlet is arranged at the lower part of the right seal head; a small-caliber thin-wall stainless steel corrugated heat exchange tube is horizontally arranged in the cylinder, four baffle plates are uniformly arranged in the vertical direction, and the upper baffle plate and the lower baffle plate are reinforced by pull rods; the right side of the lower part of the cylinder body is provided with a cold material inlet, the left side of the lower part of the cylinder body is provided with a sewage discharge outlet, the left side of the upper part of the cylinder body is provided with a cold material outlet, the right side of the cylinder body is provided with a vent, the inner sides of the cold material inlet and the cold material sewage discharge outlet are respectively provided with a support leg, and the middle part of the cylinder body is provided with an expansion joint; the heat exchanger barrel is horizontally arranged on a distillation tower discharge pipe and is fixed on a support frame higher than a distillation discharge biodiesel receiving tank by support legs. The utility model discloses production is high-efficient, convenient operation.

Description

Heat recovery device after vacuum distillation of biodiesel

technical field

The utility model relates to the technical field of biodiesel production devices, in particular to a heat recovery device for biodiesel after vacuum distillation.

Background technique

Domestic biodiesel mainly uses waste oil as raw material, and high vacuum vacuum distillation is generally used for purification in the production process. Vacuum distillation is to heat crude biodiesel to more than 200°C and distill finished biodiesel in a distillation tower with an absolute pressure of less than 2000Pa. The temperature of the distilled finished biodiesel still reaches about 200°C. The temperature is high and the heat is high. Recycling this heat energy is an important topic for energy saving and consumption reduction in biodiesel production. The existing technology generally uses a heat exchanger to exchange heat, but because the high-temperature biodiesel from the high-vacuum vacuum distillation tower contains a small amount of fine carbon particles, it will stick to the wall of the heat exchanger after long-term operation. If a stainless steel spiral plate is used The heat exchanger is used to cool down and exchange heat. The carbon particles sticking to the hot channel will seriously affect the heat transfer effect. After a long time, the channel will be blocked, and the carbon deposits stuck on the wall cannot be well removed by washing with water or pickling. . If the traditional stainless steel tube heat exchanger is used, the heat exchange effect is poor. Therefore, it is necessary to develop a heat recovery device after vacuum distillation of biodiesel to solve the problems of carbon deposition in the heat exchanger and low heat transfer efficiency.

Contents of the invention

The purpose of the utility model is to provide a heat recovery device after vacuum distillation of biodiesel with high production efficiency and convenient operation.

In order to achieve the above purpose, the heat recovery device after biodiesel vacuum distillation of the utility model includes a heat exchanger cylinder 14; the left and right ends of the heat exchanger cylinder 14 are respectively connected to a head 10 through a flange 12; The upper part is provided with a hot material inlet 1, the lower part is provided with a hot material outlet 2, the left end is provided with a hand hole 18, a partition 11 is horizontally provided in the left head, and a detachable distribution plate 17 is installed on the partition 11; A distribution plate 19 is arranged inside the head, and its top is flush with the partition plate 11 to form a double-tube arrangement. The lower part of the right head is provided with a hot material sewage outlet 3; the heat exchanger cylinder 14 is horizontally provided with corrugated heat exchange tubes 15. The corrugated heat exchange tube 15 adopts small-diameter thin-walled stainless steel corrugated heat exchange tubes to improve the heat exchange effect; inside the heat exchanger cylinder 14, four baffles 8 are evenly arranged in the vertical direction, two on the upper and lower ones, and both are passed through the tie rods. 9 reinforcement; the lower right side of the heat exchanger cylinder 14 is provided with a cold material inlet 4, and the left side is provided with a cold material sewage outlet 6; the upper left side of the heat exchanger cylinder 14 is provided with a cold material outlet 5, and the right side is provided with a There is an air vent 7, a leg 16 is provided on the inner side of the cold material inlet 4 and the cold material sewage outlet 6, and an expansion joint 13 is provided in the middle of the heat exchanger cylinder 14; the heat exchanger cylinder 14 is installed horizontally on The outlet pipe of the distillation tower is fixed on the support frame higher than the distillation output biodiesel receiving tank through the feet 16.

The installation height of the heat exchanger cylinder 14 is 1 meter higher than the biodiesel receiving tank.

The hot material during operation is high-temperature biodiesel distilled under high-vacuum continuous decompression, and the cold material is crude biodiesel treated by a butterfly centrifuge, which is neutral and has a temperature of about 40°C. Outside the tube. The material of the heat recovery device after biodiesel decompression distillation of the utility model is all made of 304 stainless steel, and the welding seam is made of stainless steel argon arc welding; the small-diameter thin-walled stainless steel corrugated heat exchange tube is used to improve the heat exchange effect; a distribution plate is arranged at the entrance , so that the material is evenly distributed to avoid short circuit; the heat exchanger is a double-pass design, and the hot material goes in the pipe. After a period of use, the heads at both ends can be disassembled, and the carbon deposit in the pipe can be washed with a high-pressure water pump with a pressure of 50Mpa. ;On the shell side, only saponified matter and crude glycerin are attached to the surface, and it is very easy to clean with hot water when shutting down.

The heat recovery device after vacuum distillation of biodiesel of the utility model has the following technical characteristics and beneficial effects:

(1) The stainless steel corrugated heat exchange tube with small diameter and thin wall is used. The tube path is double return, which occupies a small area, increases the heat exchange area, compact equipment, and good heat recovery effect.

(2) There are two distribution plates to prevent the material in the tube from short-circuiting, which can greatly improve the heat exchange effect.

(3) The carbon deposit in the tube side can be regularly dismantled and cleaned with a high-pressure cleaning pump to improve the heat exchange effect.

(4) The feed head is equipped with a hand hole, which is convenient for disassembly and inspection and cleaning of carbon deposits.

(5) The structure is simple, the operation is simple and convenient, and the maintenance cost is low.

The heat recovery device after biodiesel decompression distillation of the utility model solves the deficiencies of the existing stainless steel spiral plate heat exchanger or ordinary tube heat exchanger: one is that the high-temperature biodiesel channel of the spiral plate heat exchanger will accumulate carbon , cannot be cleaned, which will seriously affect the heat transfer, and will also affect the discharge of the distillation tower; the second is that the heat transfer effect of ordinary tube-and-tube heat exchangers is poor, and the tube-side materials are easy to short-circuit and occupy a large area.

Description of drawings

Fig. 1 is a structural schematic diagram of a heat recovery device after vacuum distillation of biodiesel of the present invention.

Reference signs: hot material inlet 1, hot material outlet 2, hot material sewage outlet 3, cold material inlet 4, cold material outlet 5, cold material sewage outlet 6, vent opening 7, baffle plate 8, tie rod 9, head 10. Partition plate 11, flange 12, expansion joint 13, heat exchanger cylinder 14, corrugated heat exchange tube 15, foot 16, detachable distribution plate 17, hand hole 18, distribution plate 19.

Detailed ways

The heat recovery device of the utility model after vacuum distillation of biodiesel will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Fig. 1, the heat recovery device after the biodiesel decompression distillation of the utility model comprises a heat exchanger cylinder 14; the left and right ends of the heat exchanger cylinder 14 are respectively connected to a sealing head 10 by a flange 12; the left sealing head The upper part is provided with a hot material inlet 1, the lower part is provided with a hot material outlet 2, the left end is provided with a hand hole 18, a partition 11 is horizontally provided in the left head, and a detachable distribution plate 17 is installed on the partition 11; A distribution plate 19 is arranged inside the head, and its top is flush with the partition plate 11 to form a double-tube arrangement. The lower part of the right head is provided with a hot material sewage outlet 3; the heat exchanger cylinder 14 is horizontally provided with corrugated heat exchange tubes 15. The corrugated heat exchange tube 15 adopts small-diameter thin-walled stainless steel corrugated heat exchange tubes to improve the heat exchange effect; inside the heat exchanger cylinder 14, four baffles 8 are evenly arranged in the vertical direction, two on the upper and lower ones, and both are passed through the tie rods. 9 reinforcement; the lower right side of the heat exchanger cylinder 14 is provided with a cold material inlet 4, and the left side is provided with a cold material sewage outlet 6; the upper left side of the heat exchanger cylinder 14 is provided with a cold material outlet 5, and the right side is provided with a There is an air vent 7, a leg 16 is provided on the inner side of the cold material inlet 4 and the cold material sewage outlet 6, and an expansion joint 13 is provided in the middle of the heat exchanger cylinder 14; the heat exchanger cylinder 14 is installed horizontally on on the discharge pipe of the distillation tower, and fixed on the support frame 1 meter higher than the distillation output biodiesel receiving tank through the feet 16.

During operation, the high-temperature biodiesel from the high-vacuum decompression distillation tower enters the hot material inlet 1 after passing through the high-temperature discharge pump, and enters the upper corrugated heat exchange tube 15 evenly after passing through the detachable distribution plate 17. The hot material coming out of the upper corrugated heat exchange tube 15 is deflected and then enters the distribution plate 19, and then enters the lower corrugated heat exchange tube 15, and the hot material after heat exchange flows out from the hot material outlet 2; crude biodiesel as a cold material After passing through the feed pump, the cold material enters the shell side of the heat exchanger from the cold material inlet 4, and after exchanging heat with the hot material through four baffles 8, the material is discharged from the cold material outlet 5 and enters the high vacuum vacuum distillation tower for distillation.

A small amount of glycerin and carbon particles in the hot material can be regularly discharged from the hot material sewage outlet 3; the slag of the cold material on the shell side can be discharged from the cold material sewage outlet 6.

After the heat recovery device has been in operation for a period of time, there will be a small amount of carbon deposits in the corrugated heat exchange tubes 15 sticking to the tube walls. The high-pressure water of the high-pressure cleaning pump cleans the tube wall of the corrugated heat exchange tube 15; for the shell side of the heat recovery device, a small amount of saponification of crude biodiesel and crude glycerin will stick to it after running for a period of time, which are all water-soluble. It can be washed with hot water circulation, and the waste water can be sent to the sewage station for treatment.

Claims (2)

1. A heat recovery device after biodiesel vacuum distillation is characterized in that: it comprises a heat exchanger shell (14); the left and right ends of the heat exchanger shell (14) are respectively connected by flanges (12) A head (10); the upper part of the left head is provided with a hot material inlet (1), the lower part is provided with a hot material outlet (2), the left end is provided with a hand hole (18), and the left end is horizontally provided with a partition ( 11), a detachable distribution plate (17) is installed on the partition (11); a distribution plate (19) is arranged inside the right head, and its top is flush with the partition (11) to form a double-tube setting, and the right The lower part of the head is provided with a hot material sewage outlet (3); the corrugated heat exchange tube (15) is horizontally arranged in the heat exchanger cylinder (14), and the corrugated heat exchange tube (15) adopts a small-caliber thin-walled stainless steel corrugated heat exchanger. The heat pipe improves the heat exchange effect; four baffles (8) are evenly arranged in the vertical direction in the heat exchanger cylinder (14), two baffles are arranged on the upper and lower sides, and they are all reinforced by tie rods (9); the heat exchanger cylinder (14 ) is provided with a cold material inlet (4) on the right side of the lower part, and a cold material drain outlet (6) is provided on the left side, and a cold material outlet (5) is provided on the left side of the upper part of the heat exchanger cylinder (14), and a There is a vent (7), a foot (16) is provided on the inner side of the cold material inlet (4) and the cold material discharge outlet (6), and an expansion joint (13) is provided in the middle of the heat exchanger cylinder (14); The heat exchanger cylinder (14) is installed horizontally on the discharge pipe of the distillation tower, and is fixed on a support frame higher than the distillation output biodiesel receiving tank through a foot (16). 2. The heat recovery device after biodiesel vacuum distillation as claimed in claim 1, characterized in that: the installation height of the heat exchanger cylinder (14) is 1 meter higher than the biodiesel receiving tank.

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