what are different types of ash handling system?

In thermal power plants, an ash handling system is used to collect and dispose off discharged ash, once it has been cooled down to a manageable temperature, which is then used in various industries like construction, cement plants, and other allied industries.
Typically for a 2×500 MW plant based on Indian coal, the amount of ash generated is around 300 to 400 TPH depending on gross calorific value and ash content of the coal.
The amount of ash produced when coal is burnt in a thermal power plant is roughly thousands of tonnes. It could have an effect on other subjects too if proper ash handling methods are not followed.
Ash is conveyed mechanically, pneumatically and hydraulically. Mechanical systems typically include submerged or dry-flight conveyors, screw conveyors, and belt conveyors. Pneumatic systems may be positive or negative pressure Hydraulic systems are also known as sluice systems and may be used independently or in combination with pneumatic systems. The pneumatic and hydraulic systems utilise pipes.

SGB are exported all over the world and different industries with quality first. Our belief is to provide our customers with more and better high value-added products. Let's create a better future together.

ASH HANDLING SYSTEM:

About 80% of the ash that is generated in a thermal power plant is fly ash, with the remaining 20% being bottom ash. In the last 15&#;20 years, it is a trend worldwide to use dense phase pneumatic conveying for fly ash collection and handling within a power plant For different environmental, economic and product benefits, coal ash is used by different types of industries in different ways of its necessity.

FLY ASH DISPOSAL

Fly Ash should be disposed of in dry mode (for normal continuous operation) and in wet slurry mode or high concentration slurry disposal (HCSD) mode (for initial operation period till 100% dry fly ash utilization is achieved and emergency operation when the dry disposal is interrupted). Fly Ash is a fine particulate that is collected via an economic hopper, air-preheated hopper and electrostatic precipitator (ESP).

BOTTOM ASH DISPOSAL

Bottom ash should be disposed of in a wet or semi-wet mode. Bottom Ash is mostly coarse and hence needs to be crushed before it is transported via an Ash Handling System.

In view of the above, the ash handling system covers evacuation of ash and its disposal in wet, semi-wet and dry form and consists of numerous equipment that works in a coordinated manner to achieve the ultimate functional need.

ASH HANDLING SYSTEMS ARE PRIMARILY BIFURCATED ON THE FOLLOWING GROUNDS:

1. Fly Ash Handling System: Fly Ash is captured and removed from the flue gases by an economizer, air-preheater, and ESP that are located at the outlet of the furnace and before the induced draft. The fly ash is pneumatically transported from collection hoppers of the economiser, air-preheater, and ESP to the storage silos.
2. Bottom Ash Disposal System: This system collects ash in the bottom hopper which is located directly under the furnace boiler. As this is coarse in nature, it has to be treated by multiple systems like clinker grinders which then ensure that the size of the bottom ash is manageable and can be easily transported to temporary storage or to an ash pond in slurry form.
3. Ash Slurry Disposal System: The bottom ash that is collected by the Bottom Ash Disposal System is often mixed with water and transported to an ash disposal area.

THERE ARE THREE MAIN KINDS OF ASH HANDLING SYSTEMS:

(1) Hydraulic system
(2) Pneumatic system
(3) Mechanical system

CLASSIFICATION OF ASH HANDLING SYSTEMS:

Hydraulic System: In this system, ash from the furnace grate falls into a system of water traveling at a high-pressure and is carried to the sumps.
It is generally used in large power plants. The hydraulic system is generally used for intermittent ash disposal figures.
In this method water at sufficient pressure is used to take away the ash to a sump. The ash is then dumped.
In this method, a low-pressure jet of water coming out of quenching nozzle is used to cool the ash. The ash falls into a trough and is then removed.Pneumatic System: In this system ash from the boiler ash outlet falls into a blow tank provided below the ash hopper. The fly ash is then pushed into pipelines and conveyed by the air stream to the point of delivery. Air leaving the ash separator is passed through a filter to remove dust etc and release clean air to the atmosphere.Mechanical System: In this system cooled ash falls on the belt conveyor and is carried out continuously to the bunker. The ash is then removed to the dumping site from the ash bunker with the help of trucks.Why Macawber Beekay Ash Handling System is the best: low investment and operating costs, operational safety, simplicity, flexibility and high transport capacity depending on channel size. It has no moving part and transports the material with low speed, in a protecting operating mode.

In thermal power plants, coal is used as a fuel for generating electricity. After burning of coal, 40 % of total coal consumption is converted into ash which need to be properly disposed-off from the thermal power plant.

Types of Ash Generated in Thermal Power Plant

• Bottom Ash &#; Ash generated below furnace of the thermal power plant is called the bottom ash. The value of bottom ash generated is around 20 % of total ash. Bottom ash is mostly coarse in nature hence it needs to be further crushed before being transported to ash handling system.
• Fly Ash &#; Around 80 % of ash generated in thermal power plant is fly ash. It is in form of very fine particles which is collected via economiser hopper, air-preheater hopper and electrostatic precipitator (ESP).

What is ash handling plant or ash handling system?

Ash handling plant or ash handling system in thermal power plant are used to cooled down the ash to manageable temperature, transferred to a disposal area or storage which is further utilized in other industries.

Equipment&#;s Used in Ash Handling System in Thermal Power Plant

• Electrostatic Precipitator (ESP)
• Feed/Discharge/Sluice Gate
• Clinker Grinder or Crusher
• Jet Pump
• Dewatering Bin
• Transfer Bin
• Storage Bin
• Dry Bottom Ash Conveyor
• Clinker Cooling Conveyor
• Dry Bottom Ash System
• Slurry Pump

Layout of Ash Handling Plant or Ash Handling System in Thermal Power Plant

Want more information on Ash Handling Pump supplier? Feel free to contact us.

Working of Ash Handling System in Thermal Power Plant

Ash handling system are generally divided into three types fly ash handling system, bottom ash handling system and ash slurry disposal system.

1. Fly ash handling system:

Fly ash is captured and removed from the flue gases by economiser, air-preheater and electrostatic precipitator (ESP) located at the outlet of the furnace and before the induced draft. The fly ash is pneumatically transported from collection hopper of economiser, air-preheater and electrostatic precipitator (ESP)  to storage silo for subsequent transport by trucks.

2. Bottom ash handling system :

It is collected in bottom hopper located under the furnace boiler. Due to coarse in nature it is treated through clinkers and grinders to normalize the bottom ash size. It is then transported to bottom ash silo for temporary storage or to ash pond in slurry form.

3. Ash slurry disposal system:

Ash received from bottom ash handling system is mixed with water in bottom ash silo. Slurry formed due to mixing of water and ash is transported to ash disposal area by using two system:

1. High concentration ash slurry disposal system &#; Slurry pump is used to transport ash slurry to ash disposal area via ash slurry transportation pipes.
2. Lean ash slurry disposal system &#; Slurry transported to a dewatering bin by a jet pump, and carried to an ash dump by truck after dewatering.

Wastewater from the dewatering bin goes into an ash sedimentation tank or an ash sedimentation pond for the sedimentation of ash particles and water without ash particles is supplied to jet pump by an ash handling pump. The ash particles which settle in the ash sedimentation tank and the water tank are returned to the dewatering bin by a sludge return pump.

RELATED SEARCHES:

Introduction of thermal power plant

Introduction of coal handling plant

If you are looking for more details, kindly visit Ash Handling Pump wholesaler.