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Stable Venturi device for semi-dry desulfurization and evaluation model

A semi-dry desulfurization and Venturi technology, applied in the field of semi-dry desulfurization, can solve the problems of high airflow stability requirements, semi-dry applicability limitations, and hidden dangers of unit operation, so as to improve reaction efficiency and operational stability , The market application prospect is broad, the effect of operation stability guarantee

Pending Publication Date: 2022-07-05
SHANDONG SHENHUA SHANDA ENERGY ENVIRONMENTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional semi-dry desulfurization technology mainly uses desulfurization towers with single-hole Venturi and seven-hole Venturi devices. The height of the Venturi device is mostly more than 3 meters. The interior of the desulfurization tower is smooth, and the flue gas enters the desulfurization tower through the Venturi device. , mixed with the desulfurization material in the desulfurization tower for desulfurization; in the desulfurization tower, the stability of the airflow fed into the Venturi device is extremely high. If the pressure in the tower drops rapidly by hundreds of Pascals, it will cause the bed to collapse and bring great harm to the operation of the unit. There are great hidden dangers, especially the desulfurization towers of Venturi devices in many power generation and metallurgical plants have been dismantled because they cannot meet environmental protection requirements such as long-term stable operation and up-to-standard emissions. The applicability of the semi-dry method has been greatly limited.

Method used

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  • Stable Venturi device for semi-dry desulfurization and evaluation model
  • Stable Venturi device for semi-dry desulfurization and evaluation model
  • Stable Venturi device for semi-dry desulfurization and evaluation model

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The present embodiment provides a stable Venturi device for semi-dry desulfurization, the details of which are as follows:

[0046] A three-layer 19-hole stable Venturi device is used, in which, from the center to the outside, the first layer is provided with 1 hole, the second layer is provided with 6 holes, the third layer is provided with 12 holes, and the angle of the outermost Venturi tube is 30 °, a steady flow sleeve is set in the tapered section inside the Venturi tube, the Venturi tube: the throat length c of the throat pipe 9 is 0.8m, and the throat diameter b is 0.72m (the throat length c is 1.11 times the throat diameter b, which meets the design requirements. requirements), the diffusion angle e of the diffusion section 7 is 22.1°, the contraction angle d of the constriction section 10 is 56°, the height of the steady flow sleeve 8 is 0.1m, the inner diameter is 0.72m, the height of the 19-hole Venturi tube is 2.1m, and the steady flow sleeve The cylinder h...

Embodiment 2

[0051] The present embodiment provides a stable Venturi device for semi-dry desulfurization, the details of which are as follows:

[0052] Four layers of 43-hole stabilized Venturi are used. From the center to the outside, the first layer is provided with 1 hole, the second layer is provided with 6 holes, the third layer is provided with 12 holes, the fourth layer is provided with 24 holes, and the outermost layer of Venturi is provided with 1 hole. The included angle of the tube is 15°, and a steady flow sleeve is set in the tapered section inside the Venturi tube. The size of the Venturi tube: the throat length c is 0.55m, and the throat diameter is 0.5m (the throat length c is 1.11 times the throat diameter b). , to meet the design requirements), the diffusion angle e of the diffuser section is 22°, the contraction angle d of the contraction section is 56°, the steady flow sleeve is 0.1m, the inner diameter is 0.5m, and the total height of the 43-hole Venturi device is 1.5m....

Embodiment 3

[0057] The present embodiment provides a stable Venturi device for semi-dry desulfurization, the details of which are as follows:

[0058] Two three-layer 19-hole stable Venturi desulfurization towers in the series-parallel structure of Example 1 were adopted, and the height of the Venturi tube was 2.1 m.

[0059] The stable venturi device is welded with the inlet flue and the two desulfurization towers respectively. The original flue gas flue of each channel is connected to the two desulfurization towers, and the clean flue gas of the two towers is connected to the two desulfurization towers. The recirculated clean flue gas first enters the desulfurization tower through the stable venturi device, and the flue is connected by the baffle door switch to ensure the flow of the gas flow to realize the switching of the two towers and the series-parallel operation.

[0060] When the full load of the flue gas flow is 600MW, the pressure of the tower body of the desulfurization tower ...

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Abstract

The invention provides a stable Venturi device for semi-dry desulfurization and an evaluation model. Venturi section velocity steady-state analysis is carried out through fluid simulation, reasonable Venturi tubes are optimized and formed, the Venturi tubes are arranged in a radial and annular mode, and a (1 + 3 * 21 + 3 * 22 +... + 3 * 2n-1, n is a natural number ranging from 3 to 8) hole desulfurization tower Venturi device is formed; a flow stabilizing sleeve is arranged in the gradually-shrinking section, the throat length c is 1-2 times of the throat diameter b, the angle e is not smaller than 20 degrees, the angle d is not smaller than 50 degrees, and candle flame, air column symmetry and speed deviation lt are formed through simulation calculation; and a stable operation structure under a multi-load condition is met.

Description

technical field [0001] The invention relates to the technical field of semi-dry desulfurization, in particular to a stable venturi device for semi-dry desulfurization and an evaluation model. Background technique [0002] Semi-dry desulfurization technology is widely used in domestic power generation, sintering and other flue gas desulfurization processes. It is an efficient, environmentally friendly and water-saving technology. [0003] Conventional semi-dry desulfurization technology mainly uses desulfurization towers with single-hole Venturi and seven-hole Venturi devices. The height of the Venturi device is more than 3 meters. The interior of the desulfurization tower is smooth, and the flue gas enters the desulfurization tower through the Venturi device. , mixed with the desulfurization material in the desulfurization tower for desulfurization; the desulfurization tower has extremely high requirements on the stability of the airflow introduced into the Venturi device. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50G06F30/20
CPCB01D53/80B01D53/50G06F30/20
Inventor 吴华李宗强杨春振
Owner SHANDONG SHENHUA SHANDA ENERGY ENVIRONMENTAL
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