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Method and device for removing phosphine in tail gas of yellow phosphorus boiler through oxidation

A yellow phosphorus furnace and tail gas technology, which is applied in the field of phosphine removal in the yellow phosphorus furnace tail gas, can solve the problems of difficult use of catalysts, decreased dephosphine efficiency, and increased cost, achieving efficient dephosphine removal, reduced corrosion, and extended use The effect of longevity

Inactive Publication Date: 2011-07-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Due to the formation of complexes, the cuprous salt generated in the first step reaction is consumed, making it difficult for the catalyst to be used for deep dephosphination, resulting in a decrease in dephosphination efficiency and an increase in cost

Method used

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  • Method and device for removing phosphine in tail gas of yellow phosphorus boiler through oxidation
  • Method and device for removing phosphine in tail gas of yellow phosphorus boiler through oxidation
  • Method and device for removing phosphine in tail gas of yellow phosphorus boiler through oxidation

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Effect test

Embodiment 1

[0019] PH in the tail gas of yellow phosphorus furnace 3 The removal method, the process steps are: lead the tail gas of the yellow phosphorus furnace into the dust removal and phosphorus removal tank, use the liquid in the dust removal and phosphorus removal tank to remove a small amount of elemental yellow phosphorus and phosphorus pentoxide in the tail gas of the yellow phosphorus furnace; The tail gas of the yellow phosphorus furnace after phosphorus is passed into the alkali absorption tower, and the SO in the tail gas of the yellow phosphorus furnace is removed by a desulfurizer 2 , HF and other acid gases; finally, the yellow phosphorus furnace tail gas treated by the alkali absorption tower is passed into the dephosphine tower, and sprayed by the dephosphine agent in the dephosphine tower, the liquid in the dust removal and phosphorus removal tank is water, and the desulfurizer 20%wt Na 2 CO 3 , the dephosphine agent is 10%wt potassium permanganate solution.

Embodiment 2

[0021] Removal of PH in tail gas of yellow phosphorus furnace 3 The device includes a dust removal and phosphorus removal tank, an alkali absorption tower and a dephosphorization tower. The dust removal and phosphorus removal tank contains a dust removal and phosphorus removal liquid, and a gas distribution pipe is arranged under the liquid surface, and the tail gas of the yellow phosphorus furnace enters the dust removal and phosphorus removal tank through the gas distribution pipe , the top of the dedusting and phosphorus removal tank is provided with a tail gas outlet, and the tail gas outlet is connected with the tail gas inlet at the bottom of the alkali absorption tower through a gas guide pipe, and the top of the alkali absorption tower is provided with a desulfurizer spray device and a tail gas outlet, and the alkali absorption tower The tail gas outlet is connected to the tail gas inlet at the bottom of the dephosphination tower, and the top of the dephosphination towe...

Embodiment 3

[0023] The wet oxidative dephosphination process system consists of dust removal and phosphorus removal tank, alkali absorption tower and dephosphination tower, etc., such as figure 1 shown.

[0024] The tail gas of the yellow phosphorus furnace comes in from the main pipe of the yellow phosphorus furnace device, and its pressure is 40-60mbar. The water level of the water seal is adjusted according to the pressure requirements through the water seal tank, and the pressure is adjusted to a slight positive pressure. It enters the dust removal and phosphorus removal tank from the outlet to remove dust and phosphorus. The tank is filled with a certain liquid level to ensure that the gas pipe is submerged in water, and the phosphorus furnace gas bulges out from the evenly distributed small holes. The water in the dust and phosphorus removal tank is supplied by the pump, and the overflow water is collected and recycled by the overflow tank. The sludge phosphorus deposited in the ov...

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Abstract

The present invention relates to a method for removing PH3 in tail gas of a yellow phosphorus boiler, which comprises the following technological steps: firstly, introducing the tail gas of the yellow phosphorus boiler into a dust and phosphorus removal tank, and utilizing a liquid in the dust and phosphorus removal tank to remove a small quantity of elemental yellow phosphorus and phosphorus pentoxide in the tail gas of the yellow phosphorus boiler; secondly, introducing the tail gas after dust and phosphorus removal of the yellow phosphorus boiler into an alkali absorber, and utilizing a desulfurizer to remove acid gas in the tail gas of the yellow phosphorus boiler; and thirdly, introducing the tail gas, treated by the alkali absorber, of the yellow phosphorus boiler into a phosphine removal tower, and using a phosphine removal agent in the phosphine removal tower for spraying, wherein the liquid in the dust and phosphorus removal tank is water, the desulfurizer is 20 weight percent Na2CO3,and the phosphine removal agent is 10 weight percent potassium permanganate solution. After the treatment by the steps, the phosphine content in the tail gas of the yellow phosphorus boiler is greatly reduced; the corrosive action on boiler equipment can be reduced; the service life of boilers can be prolonged; and the application of the tail gas of the yellow phosphorus boiler in heat supply projects is realized.

Description

1. Technical field [0001] The present invention mainly relates to phosphine (PH 3 ) removal method and device thereof, especially a liquid absorption tower combined with a strong oxidant to selectively absorb and oxidize the phosphine in the tail gas, so as to realize the effective removal method of the phosphine in the tail gas of the yellow phosphorus furnace. 2. Background technology [0002] During the production and operation of the yellow phosphorus plant, there is a large amount of yellow phosphorus furnace exhaust gas. Its main component is carbon monoxide, which is very harmful to human health after inhalation. People who inhale it may be dizzy or die from poisoning. Therefore, the country has a clear limit on CO concentration in the "Atmospheric Environmental Quality Standards" (the concentration limit in the secondary standard area is 10mg / M 3 ). Although the released yellow phosphorus furnace tail gas is diluted by air diffusion, it may still partially exceed t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14B01D53/18
Inventor 刘松琴
Owner SOUTHEAST UNIV
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