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Series combining method for siphoning type pasty material heat exchangers

A series combination and heat exchanger technology, applied in the direction of heat exchanger type, heat exchanger shell, indirect heat exchanger, etc., can solve the problem of inability to realize the series combination of vertical slurry material heat exchangers, and save energy. The effect of consumption, reducing power equipment, saving power and operating costs

Inactive Publication Date: 2016-06-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing technology cannot realize the series combination of vertical slurry material heat exchangers driven by material level difference

Method used

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  • Series combining method for siphoning type pasty material heat exchangers

Examples

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Effect test

Embodiment 1

[0013] Embodiment 1: slurry cooling. The slurry in this example is obtained from mineral processing, its suspended solids content is 35% (mass percentage), and the average density of the slurry is 1400kg / m 3 , in the slurry tank 4, the temperature is 95°C, the saturated vapor pressure is 40kPa (absolute pressure), and the material level is maintained at 11.0m. It is required to cool down the slurry to 80°C before entering the delivery pump 8, and the material level of the slurry tank 7 connected to the inlet of the pump 8 is not lower than 3.0m. The flow rate of the slurry delivered by the pump 8 is 860 tons / hour (t / h).

[0014] As shown in the drawings, a convective heat transfer and cooling device with three ∩-type heat exchangers connected in series is arranged between the slurry tank 4 and the slurry tank 7 . The structure and size of the three ∩-type heat exchangers are the same. The inlet and outlet shell-and-tube heat exchanger tubes are composed of 220 heat exchange ...

Embodiment 2

[0016] Example 2: multistage flash evaporation of slurry. The slurry in this example is obtained from mineral processing, its suspended solids content is 16% (mass percentage), and the average density of the slurry is 1100kg / m 3 , in the slurry tank 4, the temperature is 65°C, the saturated vapor pressure is 22kPa (absolute pressure), and the material level is maintained at 11.0m. It is required to separate part of the solvent by multi-stage flash evaporation before entering the transfer pump 8. The flow rate of the delivery pump 8 is 178 tons / hour (t / h).

[0017] As shown in the figure, a three-stage flash evaporation and convection heating device in which three ∩-type heat exchangers are connected in series are arranged between the slurry tank 4 and the slurry tank 7 . The structure and size of the three ∩-type heat exchangers are the same. The tube side of the shell-and-tube heat exchanger at the inlet and outlet ends is composed of 62 heat exchange tubes with a length of...

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Abstract

Provided are a series combining method for siphoning type pasty material heat exchangers and a multistage flash evaporation solvent separating method. The material level difference in a process system and barometric pressure energy are utilized, slurry is pushed in a siphoning manner to pass through the multistage series upright n-shaped heat exchangers for convective heat transfer, all stages of flash evaporation material levels are automatically constant, and heat is cyclically utilized. Under the conditions that the total height difference of the material levels is 7.5 m, the density of the slurry is 1,480 kg / m<3>, and the saturated vapor pressure is 40 kPa, the total length of series effective heat transfer pipes is larger than or equal to 48 m, flow velocity in the pipes is larger than or equal to 1.5 m / s, and the heat transfer coefficient is larger than 900 W / m<2>.DEG C. The three-stage series combined n-shaped heat exchangers and flash evaporators connected with the heat exchangers and provided with heat pumps are adopted for carrying out solvent separation on the aqueous solution slurry with the temperature below 100 DEG C, solvent vapor is condensed and recycled, condensation heat is lifted for heat source circulation of the n-shaped heat exchangers through the heat pumps, and the energy consumption of solvent separation is lower than 80 kW / t-water vapor.

Description

technical field [0001] The invention relates to the technical field of heat exchange for slurry materials, in particular to an energy-saving method for combining multiple ∩-type heat exchangers in series by utilizing the level difference of the slurry material itself through a siphon flow. Background technique [0002] In the process industry, shell and tube heat exchangers are often used for heat exchange of slurry materials. Slurry materials flow through the tube to exchange heat with the clean fluid medium flowing outside the tube in the form of convective heat transfer through the partition wall. In order to prevent the blockage of the slurry material flow channel, this type of heat exchanger should not only have a high flow rate in the tube to avoid deposition, but also not allow the heat exchanger structure to have deposition parts, so the slurry material heat exchanger is mostly The heat transfer area of ​​a vertical single-pass shell-and-tube heat exchanger is propor...

Claims

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Application Information

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IPC IPC(8): F28D7/16F28F9/26
CPCF28D7/16F28F9/262
Inventor 朱家骅陈洪杰李季卿培亮夏素兰
Owner SICHUAN UNIV
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