Knitted Wire Mesh Demister Pad is a popular filter element used in fertilizer factories for absorbing tower and drying tower. The demister element is produced with AISI 316 stainless steel demister grids and PTFE/Hostaflon or equivalent mesh pad material.

Demister Pads for SULFURIC ACID PLANT / FERTILIZER FACTORIES

Demister Element For Absorbing Tower (Lower)

No. Of Parts: 6(six)
Pad Diameter: 2300 mm
Demister Mesh Pad Material: Hostaflon
Pad height: 100 mm
Demister Grids material: AISI 316L
Height including grids: 150 mm
Mesh Pad Density: 225 kg/m³
Wire diameter: 0.5 mm to 0.1 mm
Allowable max. temperature: 180 °C

Demister Element For Absorbing Tower (Upper)
No. Of Parts: 6(six)
Diameter: 2300 mm
Demister Mesh Pad Material: Hostaflon
Pad height: 100 mm
Demister Grids material: AISI 316L
Height including grids: 150 mm
Mesh Pad Density: 115.5 kg/m³
Wire diameter: 0.5 mm to 0.1 mm
Allowable max. temperature: 180 °C

Demister Element For Drying Tower
No. Of Parts: 6(six)
Diameter: 2300 mm
Demister Mesh Pad Material: Hostaflon
Pad height: 100 mm
Demister Grids material: AISI 316L
Height including grids: 150 mm
Mesh Pad Density: 115.5 kg/m³
Wire diameter: 0.5 mm to 0.1 mm
Allowable max. temperature: 180 °C

TECHNICAL SPECIFICATION OF KNITTED WIREMESH DEMISTER ELEMENTS FOR ABSORBING TOWER OF SULFURIC ACID PLANT

Description of Demister Elements

The Demister Elements are pads formed by several layers of knitted wire mesh sown together. Wire strands made of poly Tetra Fluoro Ethylene (PTEE) or similar elements.

Pads of knitted wire Mesh are sandwitched between grids made of stainless steel A1SI-316L grade so that the pads retain the size & shape as per required by customers.

Shape of these pads with Grid must be such that they exactly fit in the internal section of the Shell of the Absorbing Tower which has an internal diameter of 2300mm.

Materials of the wire mesh pad can withstand maximum service temperature of NOT LESS THAN I50°C.

Demister pads with grids can be made in several sections/segments (six to eight segments) so that these can be easily handled & put inside the Absorbing lower through a manhole (400 x 600mm size) and when put together, fits exactly in 2300mm I.D.

Height of the knitted wire mesh demister pad elements to be about 95 to 105 mm and together with retaining Grid, 145 to 155mm.

The demister pads are suitable for continuous use, 24 hours a day, 330 days a year.

Scope of supply:
Demister elements are in two sets each with different density as follows:
Demister Elements in 6 to 8 segments with density of 225 kg/m³ (One) set (Lower).
Demister Elements in 6 to 8 segments with density of 115.5 kg/m³ (One) set (Upper).
Purpose: Knitted wire Mesh Demister Elements is used to eliminate/reduce mist from stack gases containing sulphuric acid leaving the Absorbing Tower of sulphuric acid plant.

Operating conditions in Absorbing Tower and the Demister
Gas entering into the Absorbing Tower at 100% of the plant load.

SO₂: 77 N³/hr =224kg/hr
SO₃ : 3,848" = 13,744''
O₂ : 6,411" =9,159"
N₂ :46,133" =57,666"
---------------------------
Total: 56,469 Nm³/hr = 80,793 kg/hr

Sulphuric Acid circulation in Absorbing Tower
Acid strength = 98.5%
Circulating Acid = 885,001 kg/hr
Temperature in = 65 °C
Temperature out = 83.5 °C
Absorbing ratio = 99.5%
(Only Gas flow varies with plant load, Acid circulation remains constant)

Gas passing through Absorbing Tower Demister to the stack at 100% plant load
SO₂: 77 N³/hr =224kg/hr
SO₃ : 20" = 72''
O₂ : 6,411" =9,159"
N₂ :46,133" =57,666"
---------------------------
Total: 52,641 Nm³/hr = 67,121 kg/hr

Outlet gas temperature =70°C± 5°C

Gas pressure at 100% plant load Absorbing Tower in = 280mm H₂O
Absorbing Tower & Demister out = 50mm H₂O
Pressure drop across demisters = 100mm H₂O
Pressure varies with the plant load which at minimum load (45%) is about 100mm at Absorbing Tower in and 10mm H2O at Demister out and pressure drop across demister is 30mm H₂O.

Materials of Constructions :
Demister elements : PTFE/Hostaflon or equivalent
Grid materials: AISI-316L or equivalent.

Size & Shape
Size & Shape varies according to requirements.

We can supply leaflet with drawing, catalogue, brochure containing relevant data showing materials specification, withstanding temperature, density of wire mesh pads, specific wire surface area (m²/m³ ), pressure drop characteristics, mist separation efficiency. Also dimensional drawing showing sections of demister element pad and together with retaining grids and flats.

Following technical files are provided also:
Performance curve showing pressure drop across the Demister offered
Performance curve showing mist separation efficiency of the Demister offered.
Country of origin
Quality, Quantity & Suitability.
A certificate for the manufacturer guaranteeing materials suitability, confirming Quality, Quantity & specifications
Other files necessory

TECHNICAL SPECIFICATION OF KNITTED WIREMESH DEMISTER ELEMEWS FOR DRYING TOWER OF SULFURIC ACID PLANT

The knitted wire Mesh Demister Elements are used to eliminate/reduce mist from dried air, containing mist of sulphuric acid leaving the Drying Tower of sulphuric acid plant.

Detail of Demister Elements for Drying Tower:

The demister elements are padsformed by several layers of knitted Wire Mesh sown together. Wire strands made of Poly Tetra Fluoro Ethylene (PTFE) or similar materials. The same wire is used in sewing the wire mesh also.

Pads of knitted wire mesh must be sandwitched between grids made of stainless steel AISI-316L grade so that the pads retainl the size & shape as per sketch drawing or specified.

Shape of these pads with grid must be such that the exactly fit in the internal section of the Shell of the Drying Tower which has internal diameter of 2300 mm.

Materials of the wire mesh pad must withstand the maximum service temperature of NO LESS THAN 150°C

Density: 11.5 Kg/m³

The Demister pads with grids should be in several sections/segments (six to eight segments) so that these can be easily handled & can be put inside the Drying Tower through a manhole (400 * 600mm size) and when put together, fits exactly in 2300mm I.D.

Height of the knitted wire mesh demister pads elements to be about 95 to 105 mm and together with retainling Grid 145 to 155mm.

The demister element is suitable for continuous use, 24 hours a day, 330 days a year.

Size of PTFE wire Strand and Mesh size of the pad meet requirements.

Operating conditions of the Demister Portion of Drying Tower

Dried Air Passing through Demister of Drying Tower at 100% of the plant load
O₂: 12,262 Nm³/hr =17,517 kg/hr
N₂: 46,133" - 57,666"
--------------------------------------------
Total: 58,395 Nm³/hr =75,183 kg/hr

Air inlet Temperature : 50 ± 5 °C

Dried Air Outlet Temperature (after Demister): 41 ± 2 °C

Operating conditions in Drying Tower

Air and Sulfuric Acid entering the Drying Tower:
Air
O₂: 12,262 Nm³/hr =17,517 kg/hr
N₂: 46,133" - 57,666"
H₂O (Moisture): 2,021" = 1.624"
--------------------------------------------
Total: 60,416 Nm³/hr =76,807 kg/hr

(Quantity of Water in Air is based on 80% Relative Humidity at 30°C)

Sulfuric Acid(H₂SO₄) strength: 94% Containing
SO₃: = 686,444 Kg/hr
H₂O : =208,190"
---------------------------
Total =8,94,634 kg/hr.

Air Blowing Pressure: 2000 to 2200mm H₂O at 100% load of the plant.
Air pressure is 200mm H₂O (flow rate 12000 Nm³/hr) during gas firing of the plant as and when required. Air pressure and flow rate varies with plant load. At 45% load air pressure is 500-600mm H₂O (30,000-35,000 Nm³/hr flow rate) and increase progressively as plant load is increased.

Dried Air and sulfuric Acid leaving the Drying Tower :
(Absorbed Water ratio is almost 100%)
Dry Air:
O₂: 12,262 Nm³/hr = 17,517 kg/hr
N₂: 46,133 Nm³/hr =57,666"
-------------------------------------
Total: 58,395 Nm³/hr = 75,183 kg/hr

D.4.4 Sulfuric Acid(H₂SO₄) strength : = 93.83% Containing
SO₃ : = 686,444 kg/hr
H₂O : = 209,814"
-------------------------
Total = 896,258 kg/hr

Scope of supply: Demister Elements in 6 to 8 segments with density of 115.5 kg/m³

Materials of Constructions:

Demister elements : PTFE/Hostaflon or equivalent

Grid materials : AISI-316L or equivalent.

Size & Shape : Size & Shape per drawing or design.

Leaflet, Catalogue, Manual, Brochures, Supply Reference list:
We provide original leaflet with drawing , catalogue, brochure from the manufacturer containing relevant data showing materials specification, withstanding temperature, Density of wire mesh pads, specific wire surface area (m2/m3), pressure drop characteristics, mist separation efficiency. Also dimensional drawing showing sections of demister element pad together with letaining grids.

Also Performance Curve :
(a) Performance Curve showing pressure drop across the Demister offered , and
(b) Performance Curve showing pressure drop across the Demister offered

Country of origin
A certificate for guaranteeing materials suitability confirming Quality, Quantity & specifications stated.

Packing
The demister elements are packed in export standard sea-worthy/Air freight packing.

Drawings Reference: