Method and system for separating powder

A powder and cyclone separation technology, applied in the direction of the cyclone device, etc., can solve the problems of fine powder separation and entrainment at a high rate, and achieve the effect of high use value

Active Publication Date: 2014-08-13
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when separating powders by screens, centrifugal separators or cyclones, etc., the problem often encountered is that fine powders are entrained in coarse powders, so that fine powders cannot be separated at a high rate

Method used

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  • Method and system for separating powder

Examples

Experimental program
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Effect test

Embodiment 1

[0096] Fly ash is obtained from the thermal power plant of Beijing Guohua Electric Power Company and can meet our product 3 classification. Pass the fly ash through figure 1 The equipment shown is separated, wherein with the help of the blower 1 and the screw feeder 2, the fly ash enters the centrifugal separator 3 with a diameter of 0.2m from the port 1, and the radius of the centrifugal classifying impeller of the centrifugal separator 3 is about 0.15m . The centrifugal speed is set at 2900rpm (the peripheral tangential velocity of the centrifugal classification impeller is about 45.5m / s). The first-stage fine ash discharged from the fine ash outlet above the centrifugal separator enters the cyclone separator 5 for separation, and the apparent cross-sectional gas velocity ν of the cyclone separator 0 is 4.5m / s, the inlet gas velocity is 16m / s, the diameter D is 0.2m, and the inlet area A is 0.008m 2 (πD 2 / 4A=3.9), height H is 0.9m (H / D=4.5), exhaust pipe diameter d r i...

Embodiment 2

[0113] Fly ash is obtained from the thermal power plant of Beijing Guohua Power Company, which is the same as that in Example 1. Pass the fly ash through figure 1 The equipment shown is separated, wherein the fly ash enters the centrifugal separator 3 with a diameter of 0.2m from the port 1 through the blower 1 and the screw feeder 2, and the centrifugal speed of the centrifugal separator is set to 500rpm (centrifugal classification impeller peripheral cut The direction speed is about 7.9m / s). The first-stage fine ash discharged from the fine ash outlet above the centrifugal separator enters the cyclone separator 5 for separation, and the apparent cross-sectional gas velocity ν of the cyclone separator 0 is 2.5m / s, the inlet gas velocity is 12m / s, the diameter D is 0.2m, and the inlet area A is 0.008m 2 , the height H is 0.9m, and the diameter of the exhaust pipe is d r It is 0.08m. The second stage of coarse ash is obtained from the coarse ash discharge port III below the...

Embodiment 3

[0129] The fly ash of same source as embodiment 1 is passed through figure 2 The system shown is separated. Operate under the same conditions as in Example 1, the difference is figure 2 The system does not include a screen separation unit.

[0130] The 3 products resulting from this isolation are listed below. Product 1 (second stage fine ash) was collected from Port IV. Product 2 (secondary coarse ash) was collected from Port III. Product 3 (primary coarse ash) was collected from Port II. The weight percent of each product is listed below.

[0131] - Product 1:D 50 0.8μm, about 2%;

[0132] - Product 2:D 50 1.3μm, about 14%;

[0133] - Product 3:D 50 It is 33 μm, about 84%.

[0134] The composition of each product is listed in Table 4 below.

[0135] - Product 1 consists of 63% Fraction A and 37% Fraction B;

[0136] - Product 2 consists of 43% Fraction A and 57% Fraction B;

[0137] - Product 3 consists of 9% Fraction A, 16% Fraction B, 51% Fraction C (or 76%...

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Abstract

The invention relates to a method and a system for efficiently and controllably separating powder into components with required sizes. The method comprises the following steps: (a) using at least a centrifugal separation device for centrifugal separation of the powder to obtain first level coarse dust and first level fine dust; and (b) using at least a cyclone separating device for cyclone separation of the first level fine dust to obtain second level coarse dust and second level fine dust. The system comprises a centrifugal separation unit; a cyclone separation unit; and optionally, a bag type filter unit. The method and the system can realize more reasonable separation of the powder, so that the powder has higher use value.

Description

technical field [0001] The present invention relates to a method and system for separating powder; more specifically, it relates to a method for efficiently and controllably dividing powder into components of required particle size, and also relates to a system for separating powder. Background technique [0002] In production activities, it is sometimes necessary to divide the powder into various powder components with narrower particle size distribution to meet different needs and improve the economic value of the powder. [0003] In production practice, one of the powders is fly ash, which is mainly produced in pulverized coal combustion furnaces, and is a fine powdery spherical material with a wide particle size range of 0.1 to 600 μm. [0004] Fly ash is used in a variety of applications such as cement and concrete or building materials. According to the national standard GB 1596-2005, for the particle size requirements for cement and concrete, fly ash is divided into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B04C9/00
Inventor 董阳卓锦德刘书贤苏建辉赖世耀
Owner CHNA ENERGY INVESTMENT CORP LTD
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