External circulating fluidized bed heat exchanger

A fluidized bed heat exchanger and external circulation technology, applied in indirect heat exchangers, heat exchanger types, heat exchanger shells, etc., can solve the problems of easy scaling of heat exchangers and decreased heat exchange effect.

Active Publication Date: 2018-09-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the heat exchanger in the prior art is easy to foul, and the heat exchange effect is obviously reduced after long-term use. An external circulating fluidized bed heat exchanger is provided.

Method used

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  • External circulating fluidized bed heat exchanger
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  • External circulating fluidized bed heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] use figure 1The external circulating fluidized bed heat exchanger shown is applied to the reaction effluent / mixed feed heat exchanger of a reforming hydrogenation unit. The external circulating fluidized bed heat exchanger is equipped with 442 heat exchanger tubes. Each tube is 8000mm long, with a diameter of Φ22×1.5mm, and the tubes are arranged in an equilateral triangle. The solid particles are glass beads with an average particle diameter of 5 mm, and the average volume solid content of the solid particles in the external circulating fluidized bed heat exchanger is 3%. The liquid phase is diesel oil with a flow velocity of 1.5m / s. The diameter of the lower casing is 12mm, and the arrangement is as follows: one in the middle, with a length of 15mm, no bevel and no opening; a total of 183 in the middle 7 layers, a length of 20mm, a bevel of 60 degrees, and a hole with a diameter of 1.2 times the average particle size of solid particles, a total of 258 in the outer 4...

Embodiment 2

[0034] The same external circulating fluidized bed heat exchanger as in Example 1 is applied to the reaction effluent / mixed feed heat exchanger of a reforming hydrogenation unit, and the solid particles are glass beads with an average particle diameter of 2 mm. The average volume solid content in the circulating fluidized bed heat exchanger is 8%. The liquid phase is diesel oil, and the flow rate is 4m / s. The diameter of the casing along the lower edge is 7.5mm, and the arrangement is as follows: one in the middle, length 20mm, no groove, no opening; 183 casings in the middle 7 layers, length 30mm, groove 30 degrees, one hole, aperture It is 1.5 times the average particle size of solid particles. There are 258 pieces in the outer 4 layers, the length is 50mm, the bevel is 15 degrees, and two holes are opened. The hole diameter is 1.2 times the average particle size of solid particles. The entrance of the down tube box is a horn tube with a single opening, the sum of the outle...

Embodiment 3

[0036] The same external circulating fluidized bed heat exchanger as in Example 1 is applied to the reaction effluent / mixed feed heat exchanger of a reforming hydrogenation unit, and the solid particles adopt aluminum oxide beads with an average particle diameter of 5mm. The average volume solid content in the external circulating fluidized bed heat exchanger is 3%. The liquid phase is diesel oil with a flow velocity of 1.5m / s. The diameter of the lower casing is 12mm, and the arrangement is as follows: one in the middle, with a length of 15mm, no bevel and no opening; a total of 183 in the middle 7 layers, a length of 20mm, a bevel of 60 degrees, and a hole with a diameter of 1.2 times the average particle size of solid particles, a total of 258 pieces in the outer 4 layers, the length is 30mm, the bevel is 30 degrees, and a hole is opened, the hole diameter is 1.2 times the average particle size of solid particles. The entrance of the down tube box is a horn tube with three...

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Abstract

The invention relates to an outer circulating fluidized bed heat exchanger. The outer circulating fluidized bed heat exchanger is mainly used for solving the technical problem that the tube pass of a reformed hydrogenation unit reaction effluent / mixed feeding heat exchanger is easy to scale in the prior art, and thus the heat exchange effect can be lowered obviously after long-period use. The outer circulating fluidized bed heat exchanger comprises a lower tube box 1, heat exchanger tube nests 2, an upper tube box 3, a solid-liquid separator 4, a down pipe 5, a solid particle groove 6, a liquid storage tank 7, a liquid circulating pump 8, lower edge sleeves 9, a distribution plate 10, a baffle 11 and a horn pipe. The heat exchanger tube nests 2 are connected with the upper tube box 3, and the upper tube box 3 is connected with the solid-liquid separator 4. Solid particles enter the solid particle groove 6 through the down pipe 5 and then return to the lower tube box 1. Liquid enters the liquid storage tank 7 and then is pumped to the lower tube box 1 through the liquid circulating pump 8. By the adoption of the technical scheme, the technical problem is well solved, and the outer circulating fluidized bed heat exchanger can be used for prolonging the operation cycle of the reformed hydrogenation unit reaction effluent / mixed feeding heat exchanger.

Description

technical field [0001] The invention belongs to the field of chemical industry, specifically, belongs to the field of long-period operation of chemical heat exchange equipment, and relates to an external circulation fluidized bed heat exchanger, which is widely used to solve the problem of liquid phase leakage in the tube side, and the tube side is prone to fouling and blockage Long-term operation problems of shell and tube heat exchangers. Background technique [0002] Heat exchangers are widely used in petroleum, chemical, energy and other industries. However, as the use time increases, the heat exchanger will inevitably have dirt adhesion, which will lead to a decrease in the heat exchange efficiency of the heat exchanger and an increase in resistance, which will affect the normal operation of the heat exchanger. [0003] The development of an external circulating fluidized bed heat exchanger to replace the traditional heat exchanger can improve the heat transfer effect ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D7/16F28F1/00F28F9/22F28G1/12
Inventor 田立达顾军民张斌
Owner CHINA PETROLEUM & CHEM CORP
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