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Heat transfer analysis method and system for recovering slag waste heat based on physical method

A technology of physical method recovery and thermal analysis, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem that it is difficult to reflect the real process of particle cooling

Active Publication Date: 2018-09-14
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But up to now, most of the numerical models for heat transfer in slag waste heat recovery are for simulating the cooling process of a single particle, which has a large gap with the actual physical method, and it is difficult to reflect the real process of particle cooling

Method used

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  • Heat transfer analysis method and system for recovering slag waste heat based on physical method
  • Heat transfer analysis method and system for recovering slag waste heat based on physical method
  • Heat transfer analysis method and system for recovering slag waste heat based on physical method

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Effect test

Embodiment (1

[0052] In this calculation example, the radius of the slag flight area (fluidized bed step) is 1.1m, the mass flow rate of slag is 5kg / s (ie 18t / h), and the mass flow rate of air is 2kg / s. The initial temperature of the slag is 1500°C (1773K), and the basic physical properties are shown in Table 1. In the granulation step, the slag is broken into particles with a diameter of 1.5mm, the initial velocity is 2m / s, and the throwing angle is 15°.

[0053] Table 1 Basic physical properties of slag

[0054]

[0055] Step 1: Analyze the overall flow field and the cooling curve of the particles through the CFD model.

[0056] (1) Calculating the cooling curve of slag particles during flight by Lagrangian discretization (DPM model). Due to the symmetry of the area, only half of the area can be calculated. The computational domain has a width of 1.1m and a height of 9m, divided into 24750 square structured grids. The average temperature of the air mass flow at a height of 5m is tak...

Embodiment (2

[0068] With the process of embodiment (1), but particle diameter is reduced to 0.5mm. Compared with Example (1), the effect of particle size on the recovery process of slag waste heat can be obtained.

Embodiment (3

[0070] With the process of embodiment (1), but the air flow of two steps is all doubled. The obtained particle cooling curve is as Figure 14 shown. Compared with Example (1), the influence of the air flow rate on the slag waste heat recovery process can be obtained.

[0071] see Figure 15 , this embodiment discloses a heat transfer analysis system based on physical methods for recovering slag waste heat, including:

[0072] Model building unit 1, used to set up a granulation step CFD model and a fluidized bed step CFD model;

[0073] Curve calculation unit 2, used to calculate the cooling curve of slag particles in the granulation step based on the granulation step CFD model, and calculate the cooling curve of the slag particles in the fluidized bed step based on the fluidized bed step CFD model curve;

[0074] The distribution calculation unit 3 is used to combine the cooling curve of the slag particles in the granulation step and the cooling curve of the slag particle...

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Abstract

The invention discloses a heat exchange analysis method and system for recovering residual heat of molten slag based on a physical method. A real process for granule cooling can be reflected through modeling a numerical model, which can be used for completely describing heat exchange of a molten slag residual heat recovering process, and calculating the temperature distribution of molten slag granules in a cooling process. The method comprises the steps: (S1) modeling a CFD model for a granulating step and a CFD model for a fluidized-bed step; (S2) calculating a cooling curve of the molten slag granules in the granulating step based on the CFD model for the granulating step, and calculating a cooling curve of the molten slag granules in the fluidized-bed step based on the CFD model for the fluidized-bed step; (S3) combining the cooling curve of the molten slag granules in the granulating step and the cooling curve of the molten slag granules in the fluidized-bed step so as to obtain boundary conditions for temperature of the molten slag granules, and solving the temperature distribution of the molten slag granules at each moment according to heat-conducting differential equation values by using Matlab.

Description

technical field [0001] The invention relates to the technical field of energy and resources engineering, in particular to a heat transfer analysis method and system for recovering slag waste heat based on a physical method. Background technique [0002] The metallurgical industry is one of the industries with the highest energy consumption. The production of iron and steel is accompanied by the discharge of a large amount of high-temperature slag, whose temperature is as high as 1450-1550 ° C, which contains abundant waste heat. Recovering the waste heat of metallurgical slag is of great significance for energy saving and emission reduction. At present, the most extensive research on waste heat recovery of slag is the physical method based on centrifugal granulation represented by the rotary wheel method (RCA), the disk rotary atomizer method (SDA), the rotary cylinder atomizer method (RCLA), etc. Their common feature is that the high-temperature slag is first broken into ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG16Z99/00
Inventor 刘谦益孙永奇张作泰
Owner PEKING UNIV
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