Two-stage circulating fluidized bed desulfurization system and desulfurization process thereof

A circulating fluidized bed and desulfurization system technology, applied in chemical instruments and methods, direct contact heat exchangers, dispersed particle filtration, etc., can solve the problem of increasing ash concentration in the tower, increasing the layout elevation, and large operating resistance of the desulfurization tower and other issues, to achieve the effect of reducing the height of the tower, reducing the overall elevation, and improving the overall utilization rate

Inactive Publication Date: 2020-06-09
SHANDONG SHENHUA SHANDA ENERGY ENVIRONMENTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the ascending tower is that when the desulfurization ash in the tower flows upward with the flue gas, it will fall back into the tower from the top part of the tower due to gravity, forming an internal circulation of the desulfurization ash and increasing the ash concentration in the to

Method used

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  • Two-stage circulating fluidized bed desulfurization system and desulfurization process thereof
  • Two-stage circulating fluidized bed desulfurization system and desulfurization process thereof

Examples

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Example Embodiment

[0051] As an implementation mode, the desulfurization ash discharged from the bottom of the descending tower with the flue gas enters the bag filter, and the desulfurization ash is returned to the venturi section of the ascending tower after being filtered by the bag filter.

[0052] Among them, the structure of the bag filter is an existing structure, and those skilled in the art can specifically select the model of the bag filter according to the actual situation.

[0053] As an embodiment, the position of the Venturi section that is filtered by the bag filter and returned to the ascending tower is set to the first position; the position of the venturi section where the desulfurizing agent is added to the ascending tower is set to the second position; the first position and the second position The two positions have the same height.

[0054] As an implementation manner, an atomization device is also provided at the bottom of the ascending tower and above the Venturi section, and th...

Example Embodiment

[0058] Example two

[0059] This embodiment provides a two-stage circulating fluidized bed desulfurization process, including:

[0060] Add the desulfurizer in the desulfurizer bin from the venturi section of the ascending tower and the top of the descending tower to the desulfurization tower;

[0061] The flue gas enters the desulfurization tower from the bottom of the ascending tower for vulcanization reaction. The flue gas flows upward along the ascending tower, enters the top of the descending tower from the top of the ascending tower, and is finally discharged from the bottom of the descending tower;

[0062] During the vulcanization reaction process, the flue gas reacts with the desulfurizer to produce desulfurization ash. Part of the desulfurization ash carried by the flue gas flows back into the ascending tower from the top of the ascending tower due to gravity and inertial settlement, and becomes the desulfurization ash in the internal circulation; The flue gas is discharged ...

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Abstract

The invention belongs to the field of flue gas treatment. The problem that the arrangement elevation of a desulfurization system is increased, a support structure is large and complex, and the operation resistance of the desulfurizing tower is large can be solved. According to the two-stage circulating fluidized bed desulfurization system and the desulfurization process provided by the invention,the advantage of high concentration of materials in an ascending tower and the advantage of high contact probability of fresh materials and sulfur dioxide in a descending tower are utilized, so that the height of the tower is reduced and the overall utilization rate of a desulfurizing agent is increased under the condition of ensuring the same residence time of flue gas. The desulfurization systemcomprises a desulfurization tower and a desulfurizing agent bin, wherein the desulfurizing tower comprises the ascending tower and the descending tower, and the top of the ascending tower is communicated with the top of the descending tower; the desulfurizing agent bin is respectively communicated with a venturi section connected with the bottom of the ascending tower and the top of the descending tower and is used for respectively adding a desulfurizing agent into the desulfurizing tower from the venturi section of the ascending tower and the top of the descending tower.

Description

technical field [0001] The invention belongs to the field of flue gas treatment, and in particular relates to a two-stage circulating fluidized bed desulfurization system and a desulfurization process. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The circulating fluidized bed semi-dry desulfurization process is one of the main flue gas desulfurization and dust removal processes at present, and it is the main way to achieve "ultra-low emission" of flue gas. The main equipment of this process is a circulating fluidized bed desulfurization tower and a dust collector. The working principle is that the flue gas flows through the venturi tube of the circulating fluidized bed desulfurization tower, and the desulfurization agent and the desulfurization ash of the external circulation are fluidized and sent to the desulfurization tower. Desulfu...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D46/02B01D46/04F23J15/06F28C3/06
CPCB01D46/02B01D46/04B01D53/50B01D53/507B01D53/508B01D2258/0283F23J15/06F28C3/06
Inventor 马鸿良杨超玉潘峰杨春振高秀丽
Owner SHANDONG SHENHUA SHANDA ENERGY ENVIRONMENTAL
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