What is the purpose of fluidized bed combustion?

What is the purpose of fluidized bed combustion?

Fluidized bed combustion (FBC) is a specialized combustion process wherein solid particulates are suspended in upward jets of air in order to achieve more effective chemical reaction and heat transfer.

What is the combustion efficiency of PFBC boiler?

(3) Space-savings through a compact pressurized boiler and the elimination of the desulfurization unit. Results of PFBC technology development: (1) Gross efficiency of 43% was achieved by increasing efficiency through combined power generation utilizing pressurized fluidized-bed combustion.

What is fixed bed combustion?

combustion of coal In coal utilization: Fixed bed. In fixed-bed systems, lumps of coal, usually size-graded between 3 and 50 millimetres, are heaped onto a grate, and preheated primary air (called underfire air) is blown from under the bed to burn the fixed carbon.

What are the advantages of fluidized bed combustion?

Effective Combustion of Low-Quality Fuels. Reduced Corrosion and Erosion. Easy Ash Removal and No Clinker Formation. Less Requirement of Excess Air.

What is Afbc and CFBC boiler?

There are three basic types of fluidised bed combustion boilers: 1. Atmospheric classic Fluidised Bed Combustion System (AFBC) 2. Atmospheric circulating (fast) Fluidised Bed Combustion system(CFBC) 3. Pressurised Fluidised Bed Combustion System (PFBC).

What is the meaning of TPH in boiler?

TPH =Tonnes per hour.

What is biomass combustion?

Biomass combustion simply means burning organic material. For millennia, humans have used this basic technology to create heat and, later, to generate power through steam. While wood is the most commonly used feedstock, a wide range of materials can be burned effectively.

What are the disadvantages of fluidized-bed combustion?

Disadvantages Of Fluidized Bed Combustion: It has to be maintained at a high value because there is a continuous requirement of high-pressure air for supporting the bed. 2) Due to the requirement of continuous high-pressure air, the cost of the auxiliary units of the plant increases.

Which mattress is used in fluidized-bed combustion boiler?

Atmospheric fluidized beds use limestone or dolomite to capture sulfur released by the combustion of coal. Jets of air suspend the mixture of sorbent and burning coal during combustion, converting the mixture into a suspension of red-hot particles that flow like a fluid. These boilers operate at atmospheric pressure.

Why it is called Afbc boiler?

AFBC ( Atmospheric Fluidized Bed Combustion ) BOILER COLD START UP PROCEDURE:- AFBC boiler is a very developing technology now these days this technology is widely used in the industrial boiler for the purpose of efficient and clean burning of coal and other fuel for steam generation.

What is DP plate in boiler?

8-What do you mean by DP test in AFBC Boilers? It is the test carried out before the light up of Boiler to ensure the healthiness of air nozzle & bed plate.

What is tph capacity?

TPH =Tonnes per hour PA =Primary Air Volume of Primary Air (m3/hr) =Total PA requirement (TPH) X 1000 / 1.233 Where TPH =Tonnes. Page 1. THERMAL POWER PLANT – Under Perform, Achieve and Trade. 31. TPH =Tonnes per hour.

What is combustion technology?

Combustion Technology: Some Modern Developments reviews modern developments in combustion technology, with emphasis on furnace flames. Topics covered range from equilibria and chemical kinetics in flames to corrosion and deposits in combustion systems, along with combustion aerodynamics and noise.

What is direct combustion?

Direct combustion is a thermochemical technique in which the biomass is burned in open air or in the presence of excess air. In this process, the photosynthetically stored chemical energy of the biomass will be converted into gases.

What is CFBC boiler?

CFBC, is a better alternative to AFBC or even Pulverised Combustion (PC). CFBC boilers are proven worldwide for allowing a wide range of fuel qualities and sizes to be burnt. Emissions of SOx and NOx are significantly reduced without the addition of expensive flue gas emissions control systems.

Are CFB boilers a viable solution for fuel emission reduction?

As the needs for a fuel shift are rising in response to the current CO2 emission reduction issues and the soaring oil prices, CFB boiler technology is increasingly attracting attention as a viable solution. Additionally, CFB boilers offer benefits such as low pollution, high-efficiency combustion, space saving, and high maintainability.

What is a cyclone in a boiler?

In the cyclone the heavier particles separate from the gas and falls to the hopper of the cyclone. This returns to the furnace for recirculation. Hence the name Circulating Fluidized Bed combustion. The hot gases from the cyclone pass to the heat transfer surfaces and go out of the boiler.

What is circulating fluidized bed combustion?

Hence the name Circulating Fluidized Bed combustion. The hot gases from the cyclone pass to the heat transfer surfaces and go out of the boiler. To start with the bed material is sand. Some portion is lost in the ash during the operation and this has to be made-up. In coal fired boilers the ash from the coal itself will be the makeup material.