CN203139821U - Novel double-layer filter pipe - Google Patents

Abstract

The utility model belongs to the technical field of nuclear fuel element production, and particularly relates to a novel double-layer filter pipe; the technical problem solved by the utility model is to provide a novel bidirectional filter tank which has high filtering stability and meets national discharge standards in production; the technical scheme adopted by the utility model is that the filter pipe comprises a mounting flange (1), an outer layer pipe (2), an inner layer pipe (3) and an annular plate (4), wherein the mounting flange (1) has a bicylindrical boss structure; the inner layer pipe (3) sleeves an inner boss and is welded with the inner boss; the outer layer pipe (2) sleeves an outer boss and is welded with the outer boss; the annular plate (4) has a single annular boss structure; the inner layer pipe (3) is welded on the inner circle of the boss, and the outer layer pipe (2) is welded on the outer circle of the boss. The beneficial effects of the utility model are that the filtering stability is high; national discharge standards for uranium-containing by-products (HF) are met during production; the filtering area for a single filter tank is increased; the filtering precision is improved significantly; and the service life is increased greatly.

Description

A kind of novel double-layer screen pipe

Technical field

The invention belongs to nuclear fuel original paper production technical field, be specifically related to a kind of novel double-layer screen pipe.

Background technology

At present, the screen pipe that uses on the domestic fuel chemical industry line is the important original paper in the uranium-bearing dust tail gas filtering, this screen pipe technology relies on South Africa star pipe always before, and the screen pipe of the domestic independent research of China is circular mono-layer tube, its size: Φ 110 * 4 * 1000; Filter area is about: 0.34m2/ props up as shown in Figure 1.Compare with the former star pipe in South Africa, the pressure drop of domestic independent research screen pipe is much bigger, and operation at the beginning just reaches the above high position of 10KPa very soon.From drop formula, main cause is that filter area reduces that (4 arms filter the gross area by 2.5m ²Be reduced to 1.2m ²); Due to the gas permeability difference.The too high meeting of pressure drop causes too high burden to exhaust system, and is unfavorable to the stable operation of producing, and therefore under the prerequisite that does not influence other effects, should reduce the filtration pressure drop as far as possible.If do not change the structure of reative cell, the increase of filter area is very limited, and improved emphasis is to increase permeability coefficient, therefore the invention discloses a kind of novel double-layer screen pipe that addresses the above problem.

Summary of the invention

Technical problem to be solved by this invention is, at above-mentioned deficiency, provides a kind of filtration stability high, meets novel bi-directional filtered jar of discharging standards in the production.

The technical solution adopted in the present invention is:

A kind of novel double-layer screen pipe wherein, comprises mounting flange, outer tube, inner layer pipe and ring flat-plate, wherein, described mounting flange is the bicylindrical boss structure, and inner layer pipe is placed in the inner convex platform outside, weld mutually with inner convex platform, outer tube is placed in the outer lug boss outside, welds mutually with outer lug boss; Described ring flat-plate is the single annular boss structure, and inner layer pipe is welded in circle in boss, and outer tube is welded in the boss cylindrical;

Aforesaid a kind of novel double-layer screen pipe, wherein, described mounting flange is the Meng Naier alloy, and last circular array is shown four waist shape air-vents, and four air-vents communicate with the interlayer of inner layer pipe and outer tube, and the mounting flange center is provided with a tie rod hole;

Aforesaid a kind of novel double-layer screen pipe, wherein, described inner layer pipe and outer tube are the sintering Monel.

Aforesaid a kind of novel double-layer screen pipe, wherein, described ring flat-plate is monel metal.。

The invention has the beneficial effects as follows:

1. it is high to filter stability, and uranium-bearing accessory substance (HF) meets discharging standards fully in the production;

2. single filtering tank filter area increases, and filtering accuracy obviously improves, and increase service life greatly;

3. break away from and external import is relied on the realization independent research.

Description of drawings

Fig. 1 is domestic single layer filter pipe;

Fig. 2 is double medium filtration pipe schematic diagram;

Fig. 3 is the mounting flange schematic diagram;

Fig. 4 is double medium filtration pipe flange vertical view.

Among the figure: 1. mounting flange, 2. outer tube, 3. inner layer pipe, 4. ring flat-plate, 5. tie rod hole, 6. air-vent.

The specific embodiment

Below in conjunction with drawings and Examples a kind of novel double-layer screen pipe provided by the invention is introduced:

As shown in Figure 2, a kind of novel double-layer screen pipe, comprise mounting flange 1, outer tube 2, inner layer pipe 3 and ring flat-plate 4, wherein, described mounting flange 1 is the bicylindrical boss structure, and inner layer pipe 3 is placed in the inner convex platform outside, welds mutually with inner convex platform, outer tube 2 is placed in the outer lug boss outside, welds mutually with outer lug boss; Described ring flat-plate 4 is the single annular boss structure, and inner layer pipe 3 is welded in circle in boss, and outer tube 2 is welded in the boss cylindrical.

As shown in Figure 3, described mounting flange 1 is the Meng Naier alloy, and last circular array is shown 6, four air-vents 6 of four waist shape air-vents and communicated with the interlayer of inner layer pipe 3 and outer tube 2, and the mounting flange center is provided with a tie rod hole 5.

Described inner layer pipe 3 and outer tube 2 are the sintering Monel.

Described ring flat-plate 4 is monel metal.

As shown in Figure 2, screen pipe length is increased to 1200mm, and diameter is Φ 110, and mounting flange Φ 140 increases the intermediate filtered inner layer pipe, and caliber Φ 60 adopts double-decker, and single filter area is from 0.34m ²Increase to 0.64m ²

New improved chimney filter does not change appearance and size, still be applicable to space, original installation site, increased intermediate filtered inner tube layer pipe, change under the little situation (particularly the structure of reative cell can't change) in other condition, improved screen pipe and held the dirt rate, the appearance dirt more high then reburner steady production cycle of rate is more long, and generally filtering pressure drop is the principal element that the dirt rate is held in influence, filtering pressure drop, more big then to hold the dirt rate more low, and drop formula is as follows: Δ P=V.d/A.[η/α+ρ .V/ β .A]

α=permeability coefficient [m ²]

β=inertia coeffeicent [Pa.kg/s ²]

D=component thickness [m]

V=flow [m ³/ s]

ρ=fluid density [kg/m ³]

Δ P=pressure drop [Pa]

A=filter element area [m ²]

η=fluid dynamic viscosity [Pa.s]

As seen, the production medium is stable from formula, and its inertia coeffeicent, flow, fluid density, fluid dynamic viscosity are almost constant, and the thickness of pipe is eigenvalue, and then influence factor mainly is permeability coefficient and filter element area.

Claims (4)

1. novel double-layer screen pipe, it is characterized in that: comprise mounting flange (1), outer tube (2), inner layer pipe (3) and ring flat-plate (4), wherein, described mounting flange (1) is the bicylindrical boss structure, inner layer pipe (3) is placed in the inner convex platform outside, weld mutually with inner convex platform, outer tube (2) is placed in the outer lug boss outside, welds mutually with outer lug boss; Described ring flat-plate (4) is the single annular boss structure, and inner layer pipe (3) is welded in circle in boss, and outer tube (2) is welded in the boss cylindrical.

2. a kind of novel double-layer screen pipe according to claim 1, it is characterized in that: described mounting flange (1) is the Meng Naier alloy, last circular array is shown four waist shape air-vents (6), four air-vents (6) communicate with the interlayer of inner layer pipe (3) and outer tube (2), and the mounting flange center is provided with a tie rod hole (5).

3. a kind of novel double-layer screen pipe according to claim 1 is characterized in that: described inner layer pipe (3) and outer tube (2) are the sintering Monel.

4. a kind of novel double-layer screen pipe according to claim 1, it is characterized in that: described ring flat-plate (4) is monel metal.

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