CN203678059U

CN203678059U - Circulating filter

Info

Publication number: CN203678059U
Application number: CN201320536386.9U
Authority: CN
Inventors: 包瑞萍
Original assignee: GANSU WENGFU CHEMICAL CO Ltd
Current assignee: GANSU WENGFU CHEMICAL CO Ltd
Priority date: 2013-08-30
Filing date: 2013-08-30
Publication date: 2014-07-02
Anticipated expiration: 2023-08-30

Abstract

The utility model relates to the technical field of chemical equipment, and particularly relates to a circulating filter. The circulating filter comprises a flash chamber dilute phosphoric acid inlet, an entrainment separator dilute phosphoric acid inlet, a filter net, a circulating filter connector, a filtered dilute phosphoric acid outlet and a tank body, wherein the filter net is in a pyramid shape. According to the circulating filter, an original conical filter net is changed into the pyramid filter net which is formed by splicing panels, each pyramid side is in a triangle shape, and compared with the traditional conical filter net with the arc surface, the pyramid filter net has the advantages that the supportive property and the stability are more prominent, stronger support force can be generated by interaction between each two acting surfaces, and the filter net is less prone to deformation and damage; the center of the filter net is on a center line of the tank body, and forms the regular pyramid shape, so that the stress surfaces are even in stress; meanwhile, at least three edges are formed at the bottom surface of the regular pyramid, the edges of the bottom surface of the regular pyramid can be increased or reduced according to the size of the tank body, and the space of the tank body is filled to play a good support effect.

Description

Recursive filter

Technical field

The utility model relates to technical field of chemical, particularly a kind of recursive filter.Being applicable to Phosphoric Acid Concentration produces.

Background technology

What my 100,000 tons/year of phosphoric acid concentrating devices of company adopted is Steam Heating forced circulation vacuum evaporation type concentration technology, the recursive filter that wherein used as shown in Figure 1, Phosphoric Acid Concentration process is exactly the process that an impurity and various crystal salt are constantly separated out, so the scale formation of equipment is very serious; Recursive filter is arranged in forced circulation loop between flash chamber and axial flow circulating pump, its effect is exactly the phosphoric acid reclaiming from entrainment trap without hot phosphoric acid and the part of evaporation for filtering flash chamber, prevent that the foulant of bringing from squeezing into graphite heat exchanger through axial flow circulating pump in a large number from flash chamber and entrainment trap, cause the quick generation of the obstruction of graphite heat exchanger tubulation or fouling, shorten the concentration systems cleaning frequency, affect effective production time.But the recursive filter that my company is used is because filter mesh diameter is less, easily cause the obstruction of filter, screen pack easily stops up and makes to produce and cannot carry out continuously, need to often take recursive filter apart and carry out labor cleaning, have a strong impact on the production time, add because screen pack stop up after under system suction function, the screen pack breakage that easily deforms, the repair time that recursive filter produces thus has a strong impact on carrying out smoothly of production too.Through retrieval, there is no well to solve at present the method for this difficult problem, do not have Patents technological document open yet.

Utility model content

The utility model solution thickening filtration device easily stops up, the yielding damage of screen pack, production can not be carried out continuously, frequent and the long technical problem of maintenance holding time of cleaning, provides a kind of stable, continuous operation, is difficult for stopping up, safeguarding the recursive filter that cleaning cycle is long.

The utility model solves the technical scheme that its technical problem adopts:

A kind of recursive filter, comprise the import of flash chamber phosphoric acid,diluted, the import of entrainment trap phosphoric acid,diluted, screen pack, recursive filter connector, filter phosphoric acid,diluted outlet and tank body, the import of described entrainment trap phosphoric acid,diluted, recursive filter connector are located on tank body, tank body top is provided with the import of flash chamber phosphoric acid,diluted, and tank body lower part is provided with and filters phosphoric acid,diluted outlet; Described screen pack is pyramid.

On the center line that is centered close to tank body of described screen pack, be orthopyramid shape.

Described screen pack is orthopyramid shape, at least 3 of the limit numbers of orthopyramid shape bottom surface.

Described screen pack is made up of board material splice, and sheet metal thickness is 10-12mm, and sheet material is evenly offered aperture Φ 9-Φ 12mm filtering holes.

The sheet material material of described screen pack is stainless steel.

Operation principle of the present utility model is as follows: the solid sediment in concentration process is all generally some complicated compounds, in the time that acid concentration raises, these compound big city exceed their saturation solubility and deposited phenomenon occur, precipitation salt can be divided into: calcium salt, villiaumite and postprecipitation salt, and that the common ground of calcium salt and villiaumite is exactly crystallization is tiny, very difficult clarification makes phosphoric acid thickness and muddiness, is suspended in and in acid, can separate out fouling; And the general non flouling behaviour of postprecipitation salt is very little on evaporation process impact itself.So recursive filter stays out of in normal productive process, but in concentration process, occur that the improper reasons such as vacuum destruction or system pipeline leakage can cause system temperature rapid drawdown, flash chamber, entrainment trap encrustation thing large area are come off, and now recursive filter plays a role.Filter fouling guarantee reaction carry out continuously.

The beneficial effects of the utility model are: 1, change original conical filtering net into pyramid screen pack, screen pack is made up of board material splice, each side of pyramid is triangle, supportive and stability are more outstanding compared with original arc surface, interaction between each acting surface can produce stronger support force, and screen pack is difficult for the breakage that deforms.On the center line that is centered close to tank body of screen pack, be orthopyramid shape, make between each stress surface stressed evenly, at least 3 of the limit numbers of orthopyramid shape bottom surface simultaneously, can, according to the limit number of tank body size orthopyramid shape increase and decrease bottom surface, fill up tank body space and play better support effect.2, sheet metal thickness increases to 10-12mm by original 6mm, and compressive property significantly promotes, and the rigidity of screen pack also significantly promotes, sheet material is evenly offered filtering holes, filtering holes aperture increases to Φ 9-Φ 12mm by Φ 6mm, and filtrate trafficability characteristic significantly promotes, and has realized fast slag, liquid are separated.Just can guarantee steady production as long as the utility model carries out normal clean and maintenance while use, recursive filter no longer stops up, filter screen damages and the phenomenon of parking maintenance, has greatly reduced production cost.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the A-A cutaway view of Fig. 1;

Fig. 3 is the structural representation of existing equipment;

Fig. 4 is the A-A cutaway view of Fig. 3.

The specific embodiment

A kind of recursive filter as depicted in figs. 1 and 2, comprises flash chamber phosphoric acid,diluted import 1, entrainment trap phosphoric acid,diluted import 2, screen pack 3, recursive filter connector 4, filters phosphoric acid,diluted outlet 5 and tank body 6, and described screen pack 3 is pyramid.On the center line that is centered close to tank body 6 of screen pack 3, be orthopyramid shape.At least 3 of the limit numbers of orthopyramid shape bottom surface.Described screen pack 3 is made up of stainless steel materials splicing, and sheet metal thickness is 10-12mm, and sheet material is evenly offered aperture Φ 9-Φ 12mm filtering holes.

?embodiment

According to tank body 6 space sizes of recursive filter, select limit, the bottom surface number of orthopyramid shape screen pack 3, at least 3 of limit, bottom surface numbers, small-sized recursive filter is generally selected positive triangular pyramid or positive rectangular pyramid, medium-and-large-sized circulator increase limit, bottom surface is counted screen pack 3 and is filled up tank body 6 spaces, when use, the olefin(e) acid of flash chamber phosphoric acid,diluted import 1 and entrainment trap phosphoric acid,diluted import 2 is entered to recursive filter.Screen pack 3 filters from filtering phosphoric acid,diluted outlet 5 importing follow-up equipments assurance productions and carries out smoothly olefin(e) acid.When improper reasons such as occurring vacuum destruction or system pipeline leakage in concentration process can cause system temperature rapid drawdown, flash chamber, entrainment trap encrustation thing large area are come off, the sheet material of 10-12mm is effectively kept out impulsive force, the structure of orthopyramid shape also can improve shock resistance, the filter screen of Φ 9-Φ 12mm has been accelerated slag simultaneously, liquid separates, reduced the weight of filtrate, effectively avoided filter screen damage phenomenon generation.

Comparative example

Recursive filter as shown in Figure 3 and Figure 4, uses conical filtering net 3 to fill tank body 6 inner spaces, when use, the olefin(e) acid of flash chamber phosphoric acid,diluted import 1 and entrainment trap phosphoric acid,diluted import 2 is entered to recursive filter.Screen pack 3 filters from filtering phosphoric acid,diluted outlet 5 importing follow-up equipments assurance productions and carries out smoothly olefin(e) acid.When improper reasons such as occurring vacuum destruction or system pipeline leakage in concentration process can cause system temperature rapid drawdown, flash chamber, entrainment trap encrustation thing large area are come off, when foulant falls, beat and on the arc surface of screen pack 3, easily produce pit, if pit is not in time found and repaired, easily there is the phenomenon of stress raisers and then reduce the support effect of screen pack in pit.Because the too small filter effect of filtering holes is limited, the empty generation of filtration is blocked filtrate and is stored up deadweight increase, easily deforms damaged ineffective.

Claims

1. a recursive filter, comprise flash chamber phosphoric acid,diluted import (1), entrainment trap phosphoric acid,diluted import (2), screen pack (3), recursive filter connector (4), filter phosphoric acid,diluted outlet (5) and tank body (6), described entrainment trap phosphoric acid,diluted import (2), recursive filter connector (4) are located on tank body (6), tank body (6) top is provided with flash chamber phosphoric acid,diluted import (1), and tank body (6) bottom is provided with filters phosphoric acid,diluted outlet (5); It is characterized in that described screen pack (3) is pyramid.

2. a kind of recursive filter according to claim 1, is characterized in that, on the center line that is centered close to tank body (6) of described screen pack (3), being orthopyramid shape.

3. a kind of recursive filter according to claim 2, is characterized in that described screen pack (3) is orthopyramid shape, at least 3 of the limit numbers of orthopyramid shape bottom surface.

4. according to a kind of recursive filter described in claim 1 or 3, it is characterized in that described screen pack (3) is made up of board material splice, sheet metal thickness is 10-12mm, and sheet material is evenly offered aperture Φ 9-Φ 12mm filtering holes.

5. a kind of recursive filter according to claim 4, the sheet material material that it is characterized in that described screen pack (3) is stainless steel.