Wagon Tippler Application

Introduction:

In May 2020 we commissioned a bag filter for the wagon tippler application that unloaded coal, coke, pet coke, slag, lignite, gypsum, iron ore, limestoneand dolomite from the open type railway wagons. The loaded wagon from its central position on the tippler cradle, is driven by a hydraulic motor and the material in unloaded. The dust generated is captured in the bag filter. The design parameters are given in Table 1.

The  manner  in which  the  dust  is removed  from  the  fabric  is crucial for the performance  of the bag filter. If the dust cake is not adequately removed, the pressure drop across the system increases which affects the performance of the system. On the other hand, too many bag cleaning cycleslead to leakage of dusty gas through damaged bags if any. The selection of design parameters is crucial to the optimum performance of a bag filter system.

The bag filter provided in this case was of Pulse jet type.

Data/Table:

Table 1: Technical Data (Design and Bag Material)

S.NO

DESCRIPTION

UNIT

PARAMETERS

Design Data:

1

Type of Filter

 

Pulse Jet bag filter

2

Duty (Continuous/Interval)

 

Continuous

3

Filter cleaning media

 

Compressed Air

4

Filter cleaning mode (online/ offline)

 

Online

5

Gas Inlet Location

 

@ Central Plenum Entry

6

Bag filter Inlet Volume

m3/hr.

1,75,000

7

Inlet Pressure of Bag Filter

mm WC

-102

8

Operating Temperature of Bag Filter

o C

125 (max.)

9

Moisture content in material

%

3-4

10

Inlet Dust Load

gm/m3

80

11

Outlet Dust Emission

mg/Nm3

≤ 20

12

Air to Cloth ratio

m3/min/m2

0.97

13

Casing design temperature

o C

200

14

Casing design pressure

mm WC

(+/-) 500

15

Pressure drop across bag filter

mm WC

150

Bag Material:

1

Filter media

 

Polyester Needle Felt

2

Type of Bag fixing

 

With Snap Band Cuff

3

Bag Diameter

mm

150

4

Bag length

mm

4265

5

Bag weight

gm/m2

550

6

Max temperature withstanding- Continuous

oC

120

7

Max temperature withstanding-  at peak for 15 min/ day

oC

135

8

Total No. of Bags

Nos.

1500

The wagon tippler application at the site

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