IS 1849:2000 (Part 1) is the Indian Standard (BIS) for design and installation of vertical mixed feed type lime kiln guide, part 1: for limestone, section 2: rcc type shaft. Provides comprehensive guidelines for the structural design, refractory lining, and installation of reinforced cement concrete (RCC) shafts used in vertical mixed-feed lime kilns for the calcination of limestone.
Design and installation of vertical mixed feed type lime kiln guide, Part 1: For limestone, Section 2: RCC type shaft
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Refractory for Burning Zone | High alumina refractories with 40-60% Al2O3 content, conforming to IS 8. | High alumina (typically 60-70% Al2O3) or basic refractories selected based on hot modulus of rupture (HMOR) and creep resistance. | VDZ Technical Guidelines |
| Insulation Brick Specification | Conforming to IS 2042 (Standard for Insulating Bricks). | Classified by service temperature group (e.g., Group 23, 26, 28) as per ASTM C155. | ASTM C155 |
| Refractory Mortar Joint Thickness | Approximately 3 mm. | Typically 1-2 mm for precision (machine-sized) bricks; consistency and type (air/heat-setting) are key. | API STD 936 |
| Vertical Expansion Joint Spacing | Prescribed at 3 to 4.5 metre intervals around the circumference. | Calculated based on kiln diameter, operating temperature, and refractory thermal expansion coefficient; not prescribed. | General Refractory Engineering Practice |
| Outer Shell Reinforcement | Prescriptive sizes for steel bands (e.g., 75 x 8 mm flats) at specified vertical spacing (400-600 mm). | Reinforcement is designed via structural analysis to resist calculated hoop stresses from thermal loads. | EN 1996-1-1 |
| Kiln Height to Diameter (H/D) Ratio | Implied ratio of ~6-7 based on typical dimensions provided in Table 1. | Generally designed for an optimal H/D ratio between 5 and 7 for thermal efficiency and stable gas flow. | VDZ Technical Guidelines |
| Foundation Design Basis | Designed considering soil bearing capacity and loads as per IS 456 and IS 1904. | Designed based on geotechnical investigation and structural codes like ACI 318 or Eurocode 7. | EN 1997-1 (Eurocode 7) |