Knitted Wire mesh demister is also known as demister, wire mesh demister, demister wire , wire mesh coalescer, flame arrester wire , SP standard wire mesh demister, wire mesh deaerator packing.
The Knitted wire mesh demister uses wire mesh types: standard wire mesh , high-efficiency wire mesh , and high-penetration wire mesh ;
1. Standard wire mesh , code-named SP;
2. High-efficiency wire mesh , code-named HP
3. High penetration wire mesh , code-named DP;
The nominal diameter range of wire mesh demister is: DN300-DN45000mm;
Knitted Wire mesh demister is divided into HG/T21618-1998 wire mesh demister and HG/T 21586-1998 drawer type wire mesh demister;
Knitted Wire mesh demister production implementation standards: HG/T 21618-1998, HG/T 21586-1998;
Marking example of wire mesh demister: HG/T 21618 wire mesh demister
1. DN2000mm, H=150mm, filter form is SP type, material weft is 316L, grille, support material is 316 upper wire mesh demister mark;
HG/T 21618 wire mesh demister S2000-150-SP-316L/316;
2.DN4000mm, H=100mm, filter form is DP type, material is 316L, grille and support material are 304 bottom-mounted wire mesh demister mark;
HG/T 21618 wire mesh demister X4000-100-DP-316L/304;
3. The nominal diameter of the demister is 800mm, the mesh thickness is 100mm, and the drawer wire mesh demister mark is all made of stainless steel;
HG/T 21586--98 WME-800-100;
Knitted Wire mesh demister material: Q235-A, 0Cr18Ni9, 304, polypropylene, PP, 00Cr19Ni10, 304L, polytetrafluoroethylene, PTFE, 1Cr18Ni9Ti, 321, nickel wire (N4, N6, N7, N8), 0Cr19Ni1 0Ti, 321, titanium wire and titanium alloy wire (TA2, TA3, TC3, TC4), 0Cr17Ni12Mo2, 316, Monel, 0Cr17Ni12Mo2Ti, 316Ti, Hastelloy (20 alloy), Hastelloy alloy, 00Cr17Ni14Mo2, 316L, Inconel, 0Cr25Ni20Si2, 310S, 00Cr20Ni25Mo4.5Cu, 904L, NS-80, (1Cr18Ni11Si4AlTi), brass wire (H65, H68, H62), red copper and other metal wire braided demisters.
HG5 series wire mesh demister type, structure and safety instructions
1. Wire mesh demister types: Wire mesh demister types include: riser type, reduced diameter type, full diameter type
1. Rising pipe type (HG5-1404-81): The mesh of the wire mesh demister is installed at the lower end of the rising pipe at the top of the equipment.
2. Reduced diameter type (HG5-1404-81): When the diameter of the mesh block of the designed wire mesh demister is smaller than the diameter of the equipment barrel, an additional short section is required to install the mesh block.
3. Full-diameter type (HG5-1404-81): When the diameter of the mesh block of the designed wire mesh demister is equal to the diameter of the equipment cylinder, the mesh block is directly installed in the cylinder.
2. Net block structure: There are two types of net block structures for wire mesh demisters: disc-shaped net blocks and strip-shaped net blocks.
1. Disk-shaped network block
The wire mesh is rolled into a mesh block with a reduced diameter. The thickness of the mesh block is equal to the width specification of the wire mesh . This mesh block makes full use of the wire mesh material and has no expected loss of corners. However, when rolling, it is required that each circle must be rolled with the same density, otherwise it is easy to cause short circuit and affect the defoaming effect. Disc-shaped mesh blocks should not be made by hand, but should be rolled mechanically to ensure rolling quality. The disc mesh block is only suitable for smaller diameter wire mesh demisters. This standard product is used for Dg300-600mm.
2. Strip net block: Strip net block is the most commonly used structure at present. It uses wire mesh to lay it out layer by layer to a specified number of layers, then puts a grille above and below the mesh layer, and then laminates the mesh to the required thickness, using distance rods and hooks to make it A whole piece. The shape and size of the strip mesh blocks vary with the nominal diameter and the number of blocks.
3. Installation of mesh blocks: When installing mesh blocks, there are two situations: from top to bottom and from bottom to top. Therefore, the wire mesh demister has two structures: top-mounted and bottom-mounted. When the inlet hole is located above the wire mesh demister, or when there is no hole but there is an equipment flange, a top-mounted wire mesh demister is selected; when the manhole is located below the wire mesh demister, a bottom-mounted wire mesh demister is selected. Wire mesh demister.
The "HG/T21618-1998 wire mesh demister" standard is based on the original Ministry of Chemical Industry standards HG5-1404-81, HG5-1405-81, HG5-1406-81, combined with the actual use experience and Revised by introducing advanced technology in the device. The structural design of general wire mesh demisters can be based on this standard as a reference; the technical parameters of the filters used in wire mesh demisters can be referred to: "HT-2001 Wire Mesh Demister Standard", "HG/21618-1998 Wire Mesh Demister Standard", "HG/T21586-1998 Drawer Type Wire Mesh Demister Standard". The newly revised "HG/T21618-1998 Wire Mesh Demister" standard has the following changes compared with the original standard:
A. Combine the original three standards into one standard to facilitate selection.
B. The diameter range and specifications of the demister have been adjusted, and the nominal diameter specifications are appropriately enlarged.
C. The type of wire mesh used in the demister is added , and the basic parameters of the wire mesh are given .
D. Added material varieties for wire mesh and grille.
E. Added process calculation content about wire mesh demister to facilitate selection.
This standard specifies the structure, type, specification, size, technical requirements, marking, selection and use regulations of wire mesh demisters .
This standard applies to gas-liquid separation equipment used in vertical cylindrical equipment in chemical, petrochemical, pharmaceutical, light industry, environmental protection and other industries. It is used to separate mist entrained in gas with a droplet diameter larger than 3~5um.
The specification range of wire mesh demister is: DN300~DN5200mm (non-standard products are not restricted by the specification range).
1. Structure of wire mesh demister
The wire mesh demister is composed of a gas-liquid filter mesh pad (made up of several pieces of mesh quickly put together) and a support piece.
The mesh block is composed of several layers of flat (surrounded) corrugated gas-liquid filters, grilles and distance rods.
The support parts of the wire mesh demister generally include: beams, battens, pressure plates, ears, support plates, sealing plates, retaining rings, etc.
The support parts are made by the container equipment manufacturer. If necessary, a wire mesh demister manufacturer can also provide it, but this must be stated when ordering.
2. Types of wire mesh demister
There are two types of wire mesh demisters: top-mounted and bottom-mounted.
The diameter range of the top-mounted wire mesh demister is DN300~DN5200mm.
The diameter range of the bottom-mounted wire mesh demister is DN700~DN4600mm.
HG/T21586-1998 drawer-type wire mesh demister: The drawer-type HG/T21586-1996-1998 demister is mainly composed of a wire mesh and a rectangular wire mesh block instead of the original circular mesh block. During use, only 1~N disassembly openings are needed outside the tower body, and the strip wire mesh blocks can be directly inserted along the guide rails.
The drawer-type wire mesh demister has the following advantages: maintenance personnel do not need to enter the interior of the tower during maintenance, avoiding working under harsh conditions. They only need to divide the drawer-type wire mesh demister components into blocks along the guide rails and clean them on the platform. , repair or replace the demister components. It achieves the effect of convenience and speed, and the safety of maintenance personnel can also be guaranteed.
Features of drawer-type wire mesh demister:
1: There is no need to enter the interior of the tower for cleaning, repair or replacement.
2: Easy to clean, long service life and stable effect.
Three: Short maintenance time, low cost, simple structure and low investment.
Four: By setting a blind plate, low-load operation can be quickly used, which improves adaptability and expands the scope of application.
Purpose of the wire mesh demister: It is installed in front of the gas outlet at the top of the tower to separate the liquid droplets entrained in the tower gas. Its purpose is as follows:
——Improve tower efficiency
——Reduce material loss
——Reduce harmful components entrained in the vented air to avoid environmental pollution
Wire mesh demister structure:
——Can produce flat type, liquid-conducting type and two-stage multi-channel type three types of wire mesh demisters with thirteen structural forms , mainly multi-channel two-stage metal wire mesh demisters
——The multi-channel secondary metal mesh demister is composed of a partition and a defoaming element. The partition is fixed on the tower ring. The defoaming element is installed on the partition. The defoaming element is divided into upper and lower parts by the partition. Secondary demister. The defoaming elements are made of wire mesh and can be round, semi-circular or rectangular in shape
Wire mesh demister material
——Stainless steel wire mesh or plastic wire mesh ;
——Special material, can be customized according to user requirements.
Features of wire mesh demister :
——The common characteristics of wire mesh demisters are large specific surface area, large void ratio, simple structure, easy to use, high defoaming efficiency and small pressure drop;
——In addition to the above characteristics, the multi-channel secondary wire mesh demister also has the following characteristics:
Equipped with a liquid-conducting structure to prevent secondary entrainment;
High operating flexibility: adjusting the secondary height ratio can change the air speed to remove droplets of different sizes of particles, thus improving the defoaming efficiency;
Application: Tower with gas discharge at the top;
Application examples of wire mesh demister - oil refining, petrochemical industry, fine chemical industry, air separation and fractionation tower.
Knitted Wire mesh demister is suitable for gas-liquid separation devices used in vertical circular equipment in chemical, petrochemical, pharmaceutical, light industry, environmental protection and other industries.