Design and Comparison of Types of Silo in Koradi Power Plant

Design and Comparison of Types of Silo in Koradi Power Plant

Abstract:- In this recent competition of industries in India, which is being a rising nation in industries like ceramics, cement industry and textiles and power plant etc. still there is a requirement of modification of storing raw materials in the industry. Fly ash storing in silo and check stresses, bending moment and design of silo in this paper. Also done a comparison between manual load calculation for three silos and calculating results of stresses and bending moment in STAAD PRO. After both load calculation and find the stresses, bending moment of three of silos comparing and design best silo.

In Thermal power plant, after burning the coal more amount of ash coming in silo. This ash very useful to the construction material such as cement plant, road etc.

In this paper, I am comparing the three types of silo such as square, rectangular & circular. On these silo what effects (shear stresses, bending moment) takes places after applied load such as ash loading, seismic load & wind load with the help of STAAD-PRO software. Comparing these three silo by the Nagpur zone.

STRUCTURE CONFIGURATION

Select silo in MAHAGENCO power plant, koradi, Nagpur Maharashtra. Here using the circular silo. Comparatively study of Varies types of silos such as circular, rectangular & square. Generally, in industrial project using the circular rcc silo & steel silo. In this comparing silo designing commonly use factor are as follows-

INTRODUCTION

Reinforced concrete silo is inherently durable than steel silo. The design of silo is based on the strength design method. The design of silos is primarily governed by the type and properties of the stored material. The walls of the silos are typically subjected to both normal pressure and vertical frictional shear or traction produced by the material stored inside the silo. The magnitude and distribution of both shear and normal pressure over the height of the wall depend on the properties of the stored material and whether the silo is being filled or discharged. Design of silo considers both static & dynamic condition. Static & dynamic pressure exerted by the stored material. Other potential loads, including seismic loads, calculation of seismic load consider silo self-weight and material stored in it as a lumped mass and seismic effect of this mass is considered in design of the silo wall. At the time, rcc wall of silo casting step by step carried. In this analysis, I am taking 1M*1M span of shear wall along the length & height of silos. For the analysis, manually calculate the load (ash load, seismic load, wind load) and applied on the STAAD-PRO models.

Silo shall be continuously disposed to ash disposal area in dense slurry form from the power plant. Silo will be provided with outlet, form this outlet shall be connected with slurry disposal stream. This silo provided in the ash handling area. Ash is considered to be collected in Electrostatic Precipitator hopper (ESP). Ash from all these ESP hopper shall be transported pneumatically under pressure to silo.

From these basic date, types of silos analysis will be carried out with the help of STAAD-PRO software.

Keywords:- Circular silo, rectangular silo, Square silo, Ash load, Seismic load, Wind load.

SHAPES OF STRUCTURE

The load on silo vertical wall be evaluated according to the capacity of power plant. As per its using circular silo capacity, finding the rectangular and square silo areas and constant the heights.

METHODOLOGY

Manually calculating the ash load, seismic load and wind load with the help of IS code. These three load applied on silo models in staad pro v8i. Loading applied on the silo wall and wall converted plate wises. Theses silo structure divided one meter by one meter plate.

Ash loading calculation:- 660 MW Power Plant

For calculation the ash collected in silo using the Janssens

theory and assuming data are as follows-

For calculation of the seismic load using IS code 1893 and considering following data:-

Dead Load 12 KN / M2

Dead Load on top of Silo 10 KN / M2 50 % of Dead Load Live Load Calculation:

Area of silo 132.732 MM2 W14

For calculation of wind load using IS 875 (Part-3) and assuming some data:-

Basic wind speed 44 m/s

Terrain category Terrain category 2 Design Factor Risk coefficient factor K1 1

Terrain & Height factor K2 Varies with height Topography factor K3 1

Cyclonic Region factor K4 1 Wind directionality factor Kd 0.9 Area averaging factor Ka 1

After assuming these data calculating the plate wise wind load and applied on the assuming types of silo. In wind load, circular silo calculations, square silo calculation and rectangular silo calculation different because wind load depends on the area of shapes.

LOAD CASES AND COMBINATION

Mainly in this analysis three load cases are used are as follows:-

1. Ash load

2. Seismic load

3. Wind load

   How to the load combination taken are shown below:-

   Plates Nos Layer wise	Ash load	Seismic load	Wind load
   1	Ash loading 1	Seismic load 14	Wind load 14
   2	Ash loading 2	Seismic load 13	Wind load 13
   3	Ash loading 3	Seismic load 12	Wind load 12
   4	Ash loading 4	Seismic load 11	Wind load 11
   5	Ash loading 5	Seismic load 10	Wind load 10
   6	Ash loading 6	Seismic load 9	Wind load 9
   7	Ash loading 7	Seismic load 8	Wind load 8
   8	Ash loading 8	Seismic load 7	Wind load 7
   9	Ash loading 9	Seismic load 6	Wind load 6
   10	Ash loading 10	Seismic load 5	Wind load 5
   11	Ash loading 11	Seismic load 4	Wind load 4
   12	Ash loading 12	Seismic load 3	Wind load 3
   13	Ash loading 13	Seismic load 2	Wind load 2
   14	Ash loading 14	Seismic load 1	Wind load 1

   How to applied load on silo structure as shown in figure:-

   LOADING TYPES ASH LOAD, SEISMIC LOAD, WIND LOAD

   RESULTS

   In these analysis, the different result of stress and bending moment during comparison of three types of silos in staad pro software. It is concluded that, the change of

   silo shapes various results of stresses and bending moment. Again in this paper software based results balanced.

   After applying the ash loading, seismic load and wind load coming the stresses and Bending Moment are as follows:-

   PLATES NOS	CIRCULAR SILO	RECTANGULAR SILO	SQUARE SILO
   1	0.492	12.811	28.130
   2	0.116	10.507	8.389
   3	0.322	10.234	8.174
   4	0.760	11.457	15.325
   5	1.326	13.725	20.270
   6	2.004	16.838	23.010
   7	2.739	20.735	23.832
   8	3.620	25.646	18.058
   9	4.681	33.361	23.386
   10	5.834	41.017	28.367
   11	7.124	51.626	34.785
   12	8.793	69.285	45.611
   13	9.519	104.770	p>71.099
   14	28.166	153.353	113.468

   PLATES NOS	CIRCULAR SILO	RECTANGULAR SILO	SQUARE SILO
   1	221.780	218.772	1461.856
   2	-59.253	-1636.380	1091.621
   3	-68.252	-1156.920	746.228
   4	-55.132	-861.780	552.629
   5	-45.632	-666.484	430.611
   6	-36.657	-528.372	343.020
   7	-28.357	-399.826	272.585
   8	-20.759	-322.079	363.678
   9	-14.754	-263.983	341.084
   10	-9.075	-220.114	312.564
   11	-4.521	-159.521	236.678
   12	-1.037	-172.177	125.064
   13	1.258	-170.036	30.340
   14	-3.141	2.174	-448.593

   PLATES NOS	CIRCULAR SILO	RECTANGULAR SILO	SQUARE SILO
   1	221.780	218.772	1461.856
   2	-59.253	-1636.380	1091.621
   3	-68.252	-1156.920	746.228
   4	-55.132	-861.780	552.629
   5	-45.632	-666.484	430.611
   6	-36.657	-528.372	343.020
   7	-28.357	-399.826	272.585
   8	-20.759	-322.079	363.678
   9	-14.754	-263.983	341.084
   10	-9.075	-220.114	312.564
   11	-4.521	-159.521	236.678
   12	-1.037	-172.177	125.064
   13	1.258	-170.036	30.340
   14	-3.141	2.174	-448.593

   CONCLUSION

   In manual calculation of load circular silo is very easy. Value of these loading is very less.

   Applied the loading in staad pro v8i is very easy in the circular silo comparative other silos and load combination also very easy.

   Stress and bending moment value very low of circular silo and near same value of rectangular and square silo.

   But in literature surveys, more storage capacity in rectangular silo and square silo.

   The power tool for computerized structural engineering STAAD Pro is the most popular structural engineering. Analysis & multi material design prepare 3D finite model of silo in STAAD.

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