Why chimney is used in thermal power plant?

A thermal power plant chimney has two important functions: To carry undesirable combustion or smoke out of the boiler. To provide the draught that feeds air to the fire to keep it burning. The draft of the chimney comes from the rising hot air.

How is flue gas discharged through the chimneys?

How is flue gas discharged through the chimneys? Explanation: After extracting maximum possible heat by circulating the flue gas in furnace. Induce draught fan is used to remove the left over gas via chimney. This is located near the base of the chimney.

How does flue gas stack work?

Flue-gas stack draft The combustion flue gases inside the flue gas stacks are much hotter than the ambient outside air and therefore less dense than the ambient air. That movement or flow of combustion air and flue gas is called “natural draft”, “natural ventilation”, “chimney effect”, or “stack effect”.

What is chimney in steam power plant?

A Chimney is a self standing structure for venting hot gases from a boiler to the outside atmosphere [1] and to disperse them at a considerable height.

What is the function of a chimney?

Again, the main purpose of a chimney is to vent the products of combustion from your home. That function is crucial because the products of combustion contain hazardous and noxious gasses. One of the hazardous gasses your chimney needs to remove from your home is carbon monoxide.

How is the amount of cooling required by the steam power plant determined?

The amount of cooling required by any steam-cycle power plant (of a given size) is determined by its thermal efficiency. It has essentially nothing to do with whether it is fuelled by coal, gas or uranium.

What kind of energy out is obtained from steam power plant?

A steam power plant consists of a boiler, steam turbine and generator, and other auxiliaries. The boiler generates steam at high pressure and high temperature. The steam turbine converts the heat energy of steam into mechanical energy. The generator then converts the mechanical energy into electric power.

What is flue gas in thermal power plant?

Flue gas (sometimes called exhaust gas or stack gas) is the gas that emanates from combustion plants and which contains the reaction products of fuel and combustion air and residual substances such as particulate matter (dust), sulfur oxides, nitrogen oxides, and carbon monoxide (Table 3.7).

What is a steam stack?

The chimney (smokestack or stack in American and Canadian English) is the part of a steam locomotive through which smoke leaves the boiler. Steam locomotive exhaust systems typically vent cylinder exhaust through the chimney to enhance draught through the boiler.

What is steam cycle in thermal power plant?

The Rankine cycle or Rankine Vapor Cycle is the process widely used by power plants such as coal-fired power plants or nuclear reactors. In this mechanism, a fuel is used to produce heat within a boiler, converting water into steam which then expands through a turbine producing useful work.

What are the thermal power plant steam circuits?

Steam Power Plant Layout 9 The Modern Steam Power Plant Mainly Divided Into Four Circuits.

• Coal And Ash Circuit.
• Air And Gas Circuit.
• Feed Water And Steam Flow Circuit.
• Cooling Water Circuit.

How is steam generated in a thermal power plant?

In a thermal power plant ( in case of coal and lignite) steam is generated in the steam generator by heating the water . The heat energy is obtained by burning coal or lignite. Combustion products of these fuels are called flue gases.

What is the purpose of a chimney in a steam boiler?

Chimney is provided in steam boiler or any industrial furnace/incinerator for proper venting of toxic gases generated by burning fossil fuels. The height of a chimney influences its ability to transfer high concentration toxic flue gases to the external environment.

Why is there smoke coming from my chimney flue?

The smoke can also be an indication of a fuel problem if your home heating equipment burns oil. A licensed technician can help you determine if the source of the smoke is normal combustion or an issue requiring immediate attention. White smoke coming from your chimney flue is actually steam produced from condensation as a byproduct of fuel burning.

What is the height of the chimney in thermal power plant?

The height of Thermal Power plant chimney’s are dictated by the Air Pollution basis. As the Air pollution standards have become stringent. The height of the chimney’s have increased – from 100m to 150m to 220m to 275m. In recent times, 275 m chimney has become a standard. Given below are some heights of the chimney.