CN213790924U - Yellow phosphorus waste gas recycle system - Google Patents

Abstract

The utility model discloses a yellow phosphorus waste gas recycling system, wherein a main air passage of the recycling system is sequentially provided with a phosphorus receiving groove for spraying and separating phosphorus sludge and escaping gas according to the air flow sequence, a soda water solution water seal structure for separating water-soluble gas, miscellaneous gas and middle gas, and a middle and middle gas water spraying and washing gas tower, a vacuum pump, a gas holder and a polymerization furnace; a water feeding pipe for spraying is arranged above the phosphorus receiving tank and the gas washing tower; when the gas passes through the soda water solution water seal structure, the mixed gas is introduced into a secondary recovery device arranged on the branch gas passage, and an exhaust port of the secondary recovery device is externally connected with a photocatalytic disinfection device. The utility model discloses double high-efficient recovery, tail gas disinfection, simple structure, easy maintenance.

Description

Yellow phosphorus waste gas recycle system

Technical Field

The utility model relates to a phosphorus chemical industry is with equipping technical field, especially relates to a yellow phosphorus waste gas recovery utilizes system.

Background

The thermal method for preparing phosphorus, also called electric furnace method for preparing phosphorus, is to take phosphorus ore as raw material, coke as reducing agent, silica as fluxing agent, after mixing evenly according to different quantity proportions, put into an electric furnace, heat and melt at 1300-150O ℃, the phosphate in the phosphorus ore is reduced to elemental phosphorus. There are other chemical reactions in the furnace, in the reaction, P is gas phase, and escapes from the gas-guide tube of the electric furnace together with the generated carbon monoxide gas, after washing and condensing, the temperature of P is reduced to below 280 ℃ to become liquid phase and separate from CO. The condensed crude phosphorus is refined to obtain white (or yellow) waxy glossy solid-yellow phosphorus with the content of 99.9 percent. In addition to yellow phosphorus, a large amount of tail gas mixed with carbon monoxide, phosphine, hydrogen sulfide and other mixed gases, calcium silicate waste residues and ferrophosphorus are generated in the whole production.

In the prior art, the mixed tail gas is generally recycled for one time and is used for synthesizing simple secondary products such as formic acid, oxalic acid and the like, the rest gas is introduced into copper sulfate solution for absorption, the absorption rate is low, the energy waste is large, the economic value is not high, and meanwhile, due to low recovery rate and old technology, the actually discharged gas can reach the national standard, but relatively speaking, the content of the toxic gas is still greatly improved.

Therefore, a recycling system with double functions of efficient recycling, tail gas disinfection, simple structure and convenient maintenance is needed in the market.

Disclosure of Invention

The utility model aims at providing a double-layer recycling system with high-efficiency recycling, tail gas disinfection, simple structure and convenient maintenance and a manufacturing method thereof.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a yellow phosphorus waste gas recycling system is characterized in that a main air passage of the recycling system is sequentially provided with a phosphorus receiving groove for spraying and separating phosphorus sludge and escaping gas, a soda water solution water seal structure for separating water-soluble gas, miscellaneous gas and medium gas, a water spraying and washing gas tower for connecting the medium gas and the medium gas, a vacuum pump, a gas holder and a polymerization furnace according to the air flow sequence; a water feeding pipe for spraying is arranged above the phosphorus receiving tank and the gas washing tower; when the gas passes through the soda water solution water seal structure, the mixed gas is introduced into a secondary recovery device arranged on the branch gas passage, and an exhaust port of the secondary recovery device is externally connected with a photocatalytic disinfection device.

Compared with the prior art, the utility model has the advantages of it is following: (1) the utility model discloses give a long supporting to the tail gas that produces in the yellow phosphorus preparation process from the production technology, successfully realized by original light the exhaust gas and empty or absorb the situation that changes make full use of through copper sulfate consumption to make yellow phosphorus waste gas of production obtain furthest's utilization, changing waste into valuables, gained better economic benefits, social and environmental benefit. (2) The difficult point of yellow phosphorus tail gas clean-up among the prior art lies in the dephosphorization, especially P4 wherein, it exists with the form of aerosol, is difficult for being adsorbed, adopts the adsorption method in the current pile driving, and ordinary adsorbent can only adsorb P2O5 wherein, P2O3, adsorbs PH3 in a small amount, and consequently recycle's key all lies in the dephosphorization, and among the prior art, although catalytic oxidation method is very good to the effect of dephosphorization, but has higher requirement for the performance of catalyst, and is more strict to the preparation requirement of catalyst, the utility model discloses a dual dephosphorization has realized two advantages, has carried out the recycle of phosphorus as far as possible on one hand, and second normal atmospheric temperature operation need not add the air, avoids adding impurity in the tail gas again. (3) The utility model discloses in, the electric stove tail gas through handling can be as the heat source of spray drying and polymerization dehydration in the sodium tripolyphosphate production process in the polymerization furnace, and the volume that the tail gas contains carbon monoxide is 85% -90%, and calorific capacity is about 10.5 x 10⁶-11.3×10⁶Coke, such self-heating release can make the utility model discloses a whole reaction system branch is steady, reaches the technological effect of low energy consumption, high yield. (4) Compared with the conventional device, the utility model discloses the degree of depth has utilized tail gas, has obtained high value result X sodium polyphosphate as required in once retrieving, according to the composition change of tail gas two kind at least byproducts of results again in the secondary is retrieved, and only newly set up three reaction unit on overall structure, adjusted water seal arrangement's structure, whole change is little, simple structure, easy maintenance. (5) As a device for last discharging front door, the utility model is additionally provided with a photocatalysis disinfection device which does not need maintenance, only needs simple cleaning and can be used for a long time. Therefore, the recycling system of the utility model has the characteristics of double high-efficiency recycling, tail gas disinfection, simple structure and convenient maintenance.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

in the figure: a phosphorus receiving tank 1, a secondary recovery device 2, a soda water solution water seal structure 3, a photocatalytic disinfection device 4, a gas washing tower 5, a vacuum pump 6, a gas holder 7, a polymerization furnace 8 and a water supply pipe 9.

Detailed Description

Example 1:

the yellow phosphorus waste gas recycling system as shown in fig. 1 is characterized in that a main air passage of the recycling system is sequentially provided with a phosphorus receiving groove 1 for spraying and separating phosphorus sludge and escaping gas, a water seal structure 3 for separating water-soluble gas, miscellaneous gas and neutralized gas, a water spraying and washing tower 5 for introducing neutralized gas and water, a vacuum pump 6, a gas holder 7 and a polymerization furnace 8 according to the air flow sequence; a water feeding pipe 9 for spraying is arranged above the phosphorus receiving tank 1 and the gas washing tower 5; when the gas passes through the pure alkali water solution water seal structure 3, the mixed gas is introduced into a secondary recovery device 2 arranged on the branch gas passage, and an exhaust port of the secondary recovery device 2 is externally connected with a photocatalytic disinfection device 4.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (1)

1. The utility model provides a yellow phosphorus waste gas recycle system which characterized in that: the main air passage of the recycling system is sequentially provided with a phosphorus receiving groove (1) for spraying and separating phosphorus sludge and escaped gas, a soda aqueous solution water seal structure (3) for separating water-soluble gas, miscellaneous gas and medium gas, a water spraying and washing gas tower (5) for connecting medium gas and medium gas, a vacuum pump (6), a gas holder (7) and a polymerization furnace (8) according to the air flow sequence; a water feeding pipe (9) for spraying is arranged above the phosphorus receiving tank (1) and the gas washing tower (5); when gas passes through the soda water solution water seal structure (3), miscellaneous gas is introduced into a secondary recovery device (2) arranged on the branch gas passage, and an exhaust port of the secondary recovery device (2) is externally connected with a photocatalytic disinfection device (4).

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