Venturi washing device for filtering and discharging of containment vessel of nuclear power station

Abstract

The utility model discloses a Venturi washing device for filtering and discharging of a containment of a nuclear power station. The Venturi washing device comprises a horizontal tank body, a T-shaped gas distribution pipe is arranged in the tank body and comprises a horizontal section and a vertical section connected to the axial center of the horizontal section, the horizontal section is parallel to the bottom of the tank body and is arranged at the lower part in the tank body, and the vertical section extends out of the top of the tank body and is connected with a gas inlet pipe; venturi washing units are symmetrically arranged on the two sides of the horizontal section with the axial center as the symmetry center; a plurality of Venturi spray pipes are arranged in the Venturi washing unit; the venturi nozzles are alternately arranged in a staggered manner in the axial direction of the horizontal section and are symmetrically arranged in the radial direction of the horizontal section; the water washing device has the advantages of horizontal tank body, low overall height, scientific and compact arrangement structure of the Venturi spray pipes, convenience in later maintenance, good water washing effect and high safety.

Description

Technical Field

[0001] The utility model relates to the field of water scrubbers, in particular to a Venturi water scrubber for filtering and discharging a containment vessel of a nuclear power plant. Background Art

[0002] The containment filtration and exhaust system ensures the integrity of the containment by actively unloading the pressure so that the pressure inside the containment does not exceed its load limit. At the same time, the radioactive substances in the exhaust gas are filtered through the filter device installed on the pressure relief pipeline to prevent the radioactive substances from causing serious harm to the environment. Conventional filtering devices generally include water washers and metal fiber filters. Common water washers are mostly vertical tanks. Chinese patent CN104064238B discloses a non-active water washing and filtration system for airborne radioactive effluents of underground nuclear power plants. The metal tank of the water washing and filtration system is vertical. The overall height of the vertical metal tank is relatively high. The heat exchange tubes and venturi tubes in the patent are arranged in a spiral shape; this structure is not convenient for later maintenance. Utility Model Content

[0003] The utility model aims to provide a venturi water washing device for filtering and discharging of a containment of a nuclear power plant.

[0004] The innovative points of the utility model are: a horizontal tank body, a low overall height, a scientific and compact venturi nozzle arrangement structure, convenience for later maintenance, good water washing effect and high safety.

[0005] In order to achieve the above utility model purpose, the technical solution of the utility model is:

[0006] A venturi water washing device for filtering and discharging from a containment vessel of a nuclear power plant comprises a horizontal tank body; an air distribution pipe is arranged in the tank body, the air distribution pipe is T-shaped, comprises a horizontal section and a vertical section connected to the axial center of the horizontal section, the horizontal section is parallel to the bottom of the tank body and is arranged in the lower part of the tank body, the vertical section extends out of the top of the tank body and is connected to an air inlet pipe; Venturi water washing units are symmetrically arranged on both sides of the horizontal section with the axial center as the symmetry center; a plurality of venturi nozzles are arranged in the venturi water washing unit; the venturi nozzles are alternately staggered along the axial direction of the horizontal section and symmetrically arranged along the radial direction of the horizontal section; the venturi nozzle comprises a straight pipe, a contracting outer nozzle and a diffuser connected in sequence; one end of the straight pipe is connected to the horizontal section through an elbow, an inner nozzle is arranged at the other end of the straight pipe, the inner nozzle extends to the inner cavity of the contracting outer nozzle, and the side walls of the contracting outer nozzle are evenly distributed with washing liquid through holes; a shielding device with adjustable height is also arranged on the top of the diffuser.

[0007] Furthermore, the shielding device includes a shield and a support rod; the shield is conical or hemispherical, and several connecting rods are evenly arranged circumferentially inside the shield, and several connecting holes are axially arranged on the connecting rods. The connecting rods are connected to the support rods by bolts, and the lower end of the support rods is connected to the top of the diffuser.

[0008] Furthermore, the lower portion of the contracting outer nozzle is connected to a ring plate arranged on the outer wall of the straight tube.

[0009] Furthermore, both ends of the horizontal section of the air distribution pipe are connected to the inner bottom of the tank body through a support, and the support includes an arc-shaped support plate and supporting legs arranged on both sides of the bottom surface of the support plate.

[0010] Furthermore, the tank body is also provided with an inspection manhole, an exhaust port, a liquid outlet and an instrument interface.

[0011] The beneficial effects of the utility model are:

[0012] First: The horizontal tank has a low overall height, and the Venturi nozzle arrangement structure is scientific and compact, which makes full use of the area inside the tank and is also convenient for later maintenance.

[0013] Second: The gas containing radioactive particles is first mixed with the washing solution through the inner nozzle in the contracting outer nozzle, and then the water washing effect is better.

[0014] Third: a shielding device is set up to prevent the gas-liquid mixture sprayed from the venturi nozzle from directly impacting the top of the tank, thereby improving safety; on the other hand, the shield can further diffuse the range of the gas-liquid mixture, improve the gas-liquid mixing degree, and further improve the solution's filtering effect on particles, aerosols and iodine elements in the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model.

[0016] Figure 2 It is a side view of the utility model.

[0017] Figure 3 It is a top view of the utility model.

[0018] Figure 4 Schematic diagram of the Venturi nozzle structure.

[0019] Figure 5 Schematic diagram of the shielding device structure.

[0020] In the figure: 10 is the tank body, 20 is the air distribution pipe, 21 is the horizontal section, 22 is the vertical section, 30 is the Venturi water washing unit, 31 is the Venturi nozzle, 31.1 is the straight pipe, 31.2 is the contraction outer nozzle, 31.3 is the diffusion pipe, 31.4 is the inner nozzle, 31.5 is the washing liquid through hole, 31.6 is the ring plate, 40 is the shielding device, 41 is the shielding cover, 42 is the support rod, 43 is the connecting rod, 44 is the connecting hole, 50 is the support, 51 is the support plate, and 52 is the supporting leg. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings.

[0022] A venturi water washing device for filtering and discharging a containment of a nuclear power plant comprises a horizontal tank body 10; an air distribution pipe 20 is arranged in the tank body 10, and the air distribution pipe 20 is T-shaped, comprising a horizontal section 21 and a vertical section 22 connected to the axial center of the horizontal section 21, the horizontal section 21 is parallel to the bottom of the tank body 10 and is arranged in the lower part of the tank body 10, and the vertical section 22 extends out of the top of the tank body 10 and is connected to the air inlet pipe; Venturi water washing units 30 are symmetrically arranged on both sides of the horizontal section 21 with the axial center as the symmetry center; a plurality of Venturi nozzles 31 are arranged in the Venturi water washing unit 30; the Venturi nozzles 31 are alternately staggered along the axial direction of the horizontal section 21, and are symmetrically arranged along the radial direction of the horizontal section (refer to Figure 3 The venturi nozzle 31 comprises a straight pipe 31.1, a contracting outer nozzle 31.2 and a diffuser 31.3 connected in sequence; one end of the straight pipe 31.1 is connected to the horizontal section 21 through an elbow, and an inner nozzle 31.4 is arranged at the other end of the straight pipe 31.1, and the inner nozzle 31.4 extends to the inner cavity of the contracting outer nozzle 31.2, and the side wall of the contracting outer nozzle 31.2 is evenly distributed with wash liquid through holes 31.5; a shielding device 40 with adjustable height is also arranged on the top of the diffuser 31.3.

[0023] Furthermore, the inner nozzle 31.4 and the contracting outer nozzle 31.2 form a double-layer nozzle structure, and the gas containing radioactive particles passes through the inner nozzle 31.4 and is first mixed with the washing solution in the contracting outer nozzle 31.2 to form a "liquid-in-gas" mixing mode. The relative velocity between the gas and liquid phases is large, and the droplets are atomized under the high-speed airflow, and the gas humidity reaches saturation; the radioactive particles are wetted by the liquid, and violent collisions and condensation occur between the atomized droplets; the gas-liquid velocity decreases when entering the diffusion tube 31.3, and the pressure rises, and the condensation effect with the radioactive particles as condensation nuclei is accelerated, condensing into dust-containing droplets with larger diameters, which are dissolved in the washing solution of the tank body 10, and the washing effect is good.

[0024] Furthermore, the shielding device 40 includes a shield 41 and a support rod 42; the shield 41 is conical or hemispherical, and a number of connecting rods 43 are evenly arranged along the circumference inside the shield 41, and a number of connecting holes 44 are axially arranged on the connecting rod 43. The connecting rod 43 is connected to the support rod 42 by bolts, and the lower end of the support rod 42 is connected to the top of the diffuser 31.3.

[0025] Furthermore, a shielding device 40 is provided to prevent the gas-liquid mixture sprayed from the venturi nozzle 31 from directly impacting the top of the tank body 10, thereby improving safety; on the other hand, the shielding cover 41 can further diffuse the range of the gas-liquid mixture, and the gas-liquid mixtures sprayed from adjacent venturi nozzles 31 collide with each other, thereby improving the gas-liquid mixing degree and further improving the filtering effect of the solution on particles, aerosols and iodine elements in the exhaust gas.

[0026] Furthermore, the lower portion of the contraction outer nozzle 31.2 is connected to the annular plate 31.6 arranged on the outer wall of the straight tube 31.1.

[0027] Furthermore, both ends of the horizontal section 21 of the air distribution pipe 20 are connected to the bottom of the tank body 10 through a support 50 . The support 50 includes an arc-shaped support plate 51 and support legs 52 arranged on both sides of the bottom surface of the support plate 51 to ensure the stability of the air distribution pipe 20 .

[0028] Furthermore, the tank body 10 is also provided with an inspection manhole, an exhaust port, a liquid outlet and an instrument interface (all not marked in the figure), which is a prior art and can be provided according to actual needs.

[0029] The described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A venturi water washing device for filtering and discharging a nuclear power plant containment, characterized in that: The invention comprises a horizontal tank body (10); an air distribution pipe (20) is arranged in the tank body (10); the air distribution pipe (20) is T-shaped and comprises a horizontal section (21) and a vertical section (22) connected to the axial center of the horizontal section (21); the horizontal section (21) is parallel to the bottom of the tank body (10) and is arranged in the lower part of the tank body (10); the vertical section (22) extends out of the top of the tank body (10) and is connected to the air inlet pipe; Venturi water washing units (30) are symmetrically arranged on both sides of the horizontal section (21) with the axial center as the symmetry center; a plurality of Venturi nozzles (31) are arranged in the Venturi water washing unit (30); the Venturi nozzles (31) The venturi nozzle (31) is arranged in an alternating staggered manner along the axial direction of the horizontal section (21) and is arranged symmetrically along the radial direction of the horizontal section; the venturi nozzle (31) comprises a straight tube (31.1), a contracting outer nozzle (31.2) and a diffuser (31.3) connected in sequence; one end of the straight tube (31.1) is connected to the horizontal section (21) via an elbow, and an inner nozzle (31.4) is provided at the other end of the straight tube (31.1); the inner nozzle (31.4) extends into the inner cavity of the contracting outer nozzle (31.2); and the side wall of the contracting outer nozzle (31.2) is evenly distributed with wash liquid through holes (31.5); and a shielding device (40) with an adjustable height is also provided at the top of the diffuser (31.3).

2. A Venturi water washing device for filtering and discharging a nuclear power plant containment vessel according to claim 1, characterized in that: The shielding device (40) comprises a shield (41) and a support rod (42); the shield (41) is conical or hemispherical, a plurality of connecting rods (43) are evenly arranged in the circumferential direction inside the shield (41), a plurality of connecting holes (44) are axially arranged on the connecting rods (43), the connecting rods (43) are connected to the support rods (42) by bolts, and the lower end of the support rod (42) is connected to the top end of the diffuser tube (31.3).

3. A Venturi water washing device for filtering and discharging a nuclear power plant containment vessel according to claim 1, characterized in that: The lower part of the contraction outer nozzle (31.2) is connected to a ring plate (31.6) arranged on the outer wall of the straight tube (31.1).

4. A Venturi water washing device for filtering and discharging a nuclear power plant containment vessel according to claim 1, characterized in that: Both ends of the horizontal section (21) of the gas distribution pipe (20) are connected to the inner bottom of the tank body (10) via a support (50), and the support (50) comprises an arc-shaped support plate (51) and support legs (52) arranged on both sides of the bottom surface of the support plate (51).

5. A Venturi water washing device for filtering and discharging a nuclear power plant containment vessel according to claim 1, characterized in that: The tank body (10) is also provided with a maintenance manhole, an exhaust port, a liquid outlet and an instrument interface.

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