Systems
Our Credentials
- INDURE is recognized as the leading manufacturer of Ash Handling systems.
- INDURE is in business of pneumatic and hydraulic conveying since 1970.
- INDURE has to its credit successful execution of over two hundred and fifty (250) ash handling system installations of new and R&M projects for a total power generating capacity of more than 90,000 MW in India and abroad. These plants are capable of handling more than 260 million tonnes of ash per annum
- Indian coal having 40-60% ash is known to be highly abrasive due to high silica content and of low calorific value. The calorific value of Indian coal is around 3000 Kcal/kg compared to that of 6000 Kcal/kg available abroad. Therefore, Indian power plant generates about four (4) times more ash compared to similar plant else-where utilizing superior quality coal.
- INDURE systems are designed to cater to high capacities and highly abrasive Indian ash.
- The company has 100% capabilities in engineering, manufacturing, project management, supply, installation, commissioning and operation & maintenance of ash handling systems.
- We design and manufacture all types of ash handling systems, silos, conveyors, slurry duty pumps and all the equipment coming in contact with ash.
- Considering the specialized nature of our products and client needs, we have developed in-house specialization with strong engineering department, Research & Development, highly efficient production unit etc., that are of value in the market place.
- Various repeat orders and service requests from customers prove our credibility in the market and reliability in system performance for customer needs.
Conventional Bottom Ash Conveying System (Hydro Ejector System)
Overview
INDURE is one of the most experienced conventional type bottom ash system supplier in the world. Our special design of refractory lined water impounded bottom ash hopper, clinker grinder and jet pump (Hydro ejector) arrangement is the most recommended and reliable bottom ash handling system for PF boilers. This system eliminates the risk of high temperature and can be installed up to 1200°C hot ash.
We offer
- “V” Type Bottom Ash Hopper
- “W” Type Bottom Ash Hopper
- Triple “V” Bottom Ash Hopper
Summary
The Bottom Ash/Slag from the furnace is quenched in water and collected in a self supporting water impounded hopper for periodic removal through hydro ejector and pipe lines. Hopper capacities are designed to suit the customer requirement. Ash hopper is constructed in carbon steel with refractory lining inside. A hydraulic cylinder operated feed gate housing is provided in the hopper discharge for opening and closing. Double roll clinker grinder is provided below the feed gate to crush the ash clinkers up to (-) 25mm size. Crushed ash and slurry is conveyed by tangential inlet hydro ejectors to the following destinations:
- Ash disposal area directly (1500 m maximum)
- Ash slurry sump for further long distance conveying through centrifugal pumps
- Overhead hydrobin systems for further disposal by truck or conveyor
Salient Features
- Less power requirement
- Suitable to handle large bottom ash particle size
- Less operation risk in terms of temperature
- Highly stable operation
- Less installation, operation and maintenance cost
- Less instrumentation enabling easy operation and maintenance
Design Conditions
- Maximum Conveying Distance = 1.5 km
- Maximum Conveying Capacity = 120 TPH
- Conveying Velocity = 2.3 – 2.8 m/s
Experience List
Conventional Bottom Ash Conveying System Projects
Scraper Conveyor System
Overview
INDURE is one of the most experienced Scraper Conveyor Bottom Ash System supplier in India. Our special design of refractory lined dry type bottom ash hopper, clinker grinder and Submerged Scraper Conveyor (SSC) arrangement is provided for continuous operation of bottom ash handling systems in PF Boilers. This system eliminates the risk of high temperature and can be installed up to 1200°C hot ash.
Summary
The Bottom Ash/Slag from the furnace is received in a dry type hopper with emergency storage capacity up to four (4) hours of ash generation and drops directly into the scraper conveyor working continuously. Bottom Ash/Slag is conveyed up to ash sluice trenches or belt conveyor through a clinker grinder. A hydraulic cylinder operated discharge gate is provided in the hopper discharge for opening and closing. Double roll clinker grinder is equipped at outlet of the scraper conveyor to crush the ash clinkers up to (-) 25 mm size. Sluice trench system will push the collected ash with the help of nozzles upto ash slurry sump to pump it further up to disposal area. Alternatively, Belt conveyor system will convey the conditioned ash from outlet of clinker grinder upto storage silos for further disposal through trucks or by belt conveyors.
Salient Features
- Less power requirement
- Less water consumption
- Suitable for large particle size
- Less instrumentation enabling easy operation and maintenance
- Less operation risk in terms of temperature
Design Conditions
- Maximum Conveying Distance = 100 m
- Maximum Conveying Capacity = 35 TPH
Experience List
Scraper Chain Conveying System Projects
Dry Bottom Ash Conveying System
We Offer
- Bottom Ash Handling for PF Boiler
- Coarse Ash Handling for all types of Boilers
Summary
The Dry Bottom Ash Conveying System consists of a refractory lined dry bottom ash transition hopper, connected to the boiler via a mechanical seal capable of absorbing the boiler thermal expansions. The bottom of the hopper will be equipped with hydraulic driven bottom doors to isolate the conveyor system in case of maintenance. Ash will be crushed for second stage conveying from the intermediate storage hopper near the boiler for further conveying by pneumatic pressure conveying system or by conveyors.
Salient Features
- No water requirement in bottom ash extraction and cooling
- Reduces the heat losses through the boiler throat increasing the boiler efficiency
Design Conditions
- Maximum Conveying Distance = 100 m
- Maximum Conveying Capacity = 50 TPH
Experience List
Dry Bottom Ash Conveying System Projects
Vacuum Pneumatic Conveying System
Overview
Vacuum Pneumatic Conveying System is widely used and the most recommended and reliable system for handling the fly and coarse ash. Our specially designed ash extraction valve (Material Handling Valve) and other equipment provides the most suitable system for all types of boiler fly ash and coarse ash. Major advantage of this system is it can be used for fly ash and coarse ash handling in dry mode and wet mode.
We Offer
- Fly (Fine) ash handling for PF/AFBC/CFBC/WHRB etc.
- Coarse ash handling for PF/AFBC/CFBC/WHRB etc.
Summary
System will work based on the vacuum created by mechanical exhausters. The equipment in this system is directly fitted to the extraction hoppers and ash will be sucked into the storage hopper/silo.
Salient Features
- Less operating power requirement
- Suitable for ash removal in dry and wet mode
- Very less instrumentation enabling easy operation and maintenance
- Medium conveying velocity
- Very less space requirement below extraction hoppers
- Suitable for all range of capacities
- Less number of pipes and equipments
Design Conditions
- Maximum Conveying Distance = 120 m
- Maximum Conveying Capacity = 67.5 TPH
- Pick up Velocity = 10 m/s
- Working Vacuum = Up to 18 inch of Hg
- Maximum Particle Size = Fine ash & Coarse Ash
Experience List
Vacuum and Pressure Pneumatic Conveying System Projects
Pneumatic Pressure Conveying System
Overview
Our Pneumatic Pressure Conveying System for handling large variety of solid materials is provided for short and long distance conveying with lean and medium working pressures. This system is used as standalone second stage conveying up to silos after the vacuum conveying system.
We Offer
- Bed ash, coarse ash, fly (fine) ash handling for PF/AFBC/CFBC/WHRB etc.
- Crushed bottom ash for PF boiler
- Sand handling system for foundries and construction areas
Summary
System will work with lean phase mode (working pressure < 1 Kg/Sqcm) and medium phase mode (working pressure < 2.5 Kg/Sqcm) for long and short conveying distances. This system is provided with air lock vessels, rotary ash valves etc.
Salient Features
- Reduce number of pipes which run in parallel
- Highly stable operation and no pressure surge
- Low working pressure resulting in durability of equipment
- Suitable for multiple feeding systems
- Suitable for small and large capacities
- Suitable for small and longer distances
Design Conditions
- Maximum Conveying Distance = 3.0 Km
- Maximum Conveying Capacity = 130 TPH
- Pick up Velocity = 8 -12 m/s (FA), 15 – 18 m/s (BA)
- Working Pressure = 2.5 Kg/Sqcm (Maximum)
- Maximum Particle Size = 10mm
Experience List
Vacuum and Pressure Pneumatic Conveying System Projects
Dense Phase Pneumatic Pressure Conveying System
Overview
Our Dense Phase Pneumatic Pressure Conveying System for handling large variety of solid materials is provided for short and long distance conveying. INDURE’s specially designed system is compatible to convey the large variety of material with stringent properties.
We Offer
- Mill reject (Mill Pyrite) handling system for coal mills
- Sand handling system for foundries
- Bed ash, coarse ash, fly (fine) ash handling for PF/AFBC/CFBC/WHRB etc.
Summary
This system is very adaptive for all ash extraction points of fluidized bed boilers. System can work in level base mode and timer base mode. In level mode operation the system ash evacuation will be carried out based on the ash level inside the storage hoppers this saves lot of power in the operation since it operates only when material is available. In timer mode the system will operate on preset time basis which will be used for quick removal conditions.
Salient Features
- Low conveying velocity
- Reduced pipe size
- High pressure conveying
- Suitable for small and large capacities
Design Conditions
- Maximum Conveying Distance = 2.5 km
- Maximum Conveying Capacity = 120 TPH
- Pick up Velocity = 4- 5 m/s
- Working Pressure = 4 – 6 Kg/Sqcm
- Maximum Particle Size = 40mm
Experience List
Dense Phase Pneumatic Pressure Conveying System Projects
Conventional Lean Ash Slurry Disposal System
Overview
Conventional Lean Ash Slurry Disposal system is widely used in power plants for disposing ash into the ash pond.
The utilization of complete ash generated in the power plant converting into useful product is not always possible. In such conditions ash is required to be dumped in ash pond. The ash ponds are usually far away from the plant area. The most simple and efficient method of disposing ash in such cases is by pumping it in form of slurry.
We Offer
- For Fly Ash Slurry Disposal
- For Coarse and Bed Ash Disposal
- For Combined Fly Ash and Bottom Ash Disposal
Summary
We provide the lean slurry disposal system with centrifugal slurry pumps as per system/customer requirement. The flow and pressure requirement of slurry pump is designed based on following main criteria:
- Particle Size
- Removal Rate
- Disposal distance
- Disposal pipe route profile
- Density of slurry
Based on flow and pressure requirement, the number of pumps in series and parallel are selected. The first pump in the series is provided with scoop control fluid coupling for achieving head variation and other pumps in series are provided with belt drives.
The recovery system is provided to recover water from ash pond and reuse the water for ash handling after treatment.
Salient Features
- Low conveying velocity result the long life of pipes
- Highly stable operation
- Less operation and maintenance cost
Design Conditions
- Maximum Conveying Distance =15000 m
- Maximum Conveying rate = 1450 cum/hr.
- Pipeline Velocity = 2.3 – 2.8 m/s
- Maximum particle size = (-) 25mm
Experience List
Conventional Lean Ash Slurry Disposal System Projects
HCSD System
Overview
High Concentration Slurry Disposal System replaces the limitations of Lean Slurry Disposal System, Ash Water Recovery System, non-availability of storage area etc. We are adopting the technology as per customer requirements where the water scarcity, pollution control norms, disposal area availability etc. restricts the customer to go for conventional systems. Our technology is provided with 40:60%, 30:70% (water: ash) concentration mixtures for long distance disposals
We Offer
- For Fly Ash Slurry Disposal
- For Coarse and Bed Ash Disposal
- For Combined Fly Ash and Bottom Ash Disposal
Summary
We provide the HCSD system with piston diaphragm pump, piston pumps as per system/customer requirement. We are using two (2) types of slurry density measurement systems, nucleonic type and non nucleonic type.
Salient Features
- Low conveying velocity result the long life of pipes
- Reduced pipe size due to low volumetric flow rate
- Low water consumption
Design Conditions
- Maximum Conveying Distance =14500 m
- Maximum Conveying Capacity = 224 tph
- Pick up Velocity = 1.2 – 2.8 m/s
- Working Pressure = 160 bar
Experience List
Schemes
Conventional Bottom Ash Conveying System (Hydro Ejector System) using Ash Slurry Pump
Conventional Bottom Ash Conveying System (Hydro Ejector System) using Hydrobin
Bottom Ash Disposal System using Scraper Conveyor
Dry Bottom Ash Conveying System
Fly Ash Handling System (Vacuum and Pressure Conveying System)
Fly Ash Handling System (Dense Phase Conveying System)
Conventional Lean Slurry Disposal System using Ash Slurry Pump
High Concentration Slurry Disposal System
Leave a comment