calculations of heat and mass ocoal for boiler

File Size: 1MB Mar 28, 2018· Wa=[Lw+ASH+(1-Ec)-XCaO] Where, Ec is the combustion efficiency expressed as a fraction. 7.2 Heat balance on the basis of higher heating value of coal, HHV (Boiler efficiency calculation by heat loss method) 7.2.1 Outline The combustion heat generated in the furnace is equal to the sum of all heat losses and the enthalpy gain of water/steam in

composition on a mass basis, as determined in the ultimate analysis. Before we can proceed with combustion calculations it is necessary to convert these data to an effective molar composition. Example 2.2 Coal Composition Consider a Pittsburgh seam coal that contains 77.2% C, 5.2% H, 1.2% N, 2.6% S, 5.9% 0,and 7.9% ash by weight.

The time required to heat 75 kg of water (c p = 4.2 kJ/kg o C) from temperature 20 o C to 75 o C with steam produced from a boiler with capacity 200 kW (kJ/s) can be calculated by transforming eq. 2 to t = m c p dT / q = (75 kg) (4.2 kJ/kg o C) ((75 o C) - (20 o C)) / (200 kJ/s) = 86 s

Jun 01, 2017· As efficiency of furnace is 85–90% that means ratio of heat consumed to form steam by heat given by coal is 0.85–0.90. so find the heat that is given by coal. Then equate that heat that is heat given by coal= (mass of coal)*GCV. You have value of heat and GCV. You will get mass.

Steam Mass Flow = Feedwater Mass Flow - Feedwater Mass Flow * Blowdown Rate; Feedwater Mass Flow = Steam Mass Flow / [ 1 - Blowdown Rate] [ Feedwater Mass Flow = 31.6 klb/hr = 30.2 klb/hr / ( 1 - 0.044 ) ] Using the Steam Property Calculator, properties are determined using Deaerator Pressure and Quality = 0 (Saturated Liquid).

This specific heat calculator is a tool that determines the heat capacity of a heated or a cooled sample. Specific heat is just the amount of thermal energy you need to supply to a sample weighing 1 kg to increase its temperature by 1 K. Read on to learn how to apply the heat capacity formula correctly to obtain a valid result.

3. boiler Heat content of boiler blow- down water. Heat in Fuel Heat in atomising steam Sensible heat in fuel INPUT Pulveriser or crusher power Boiler Circulating pump power Primary air fan power Recirculating gas fan power Heat supplied by moisture in entering air. Heat in Final superheater steam.

Modern Rankine cycle, adopted in coal fired power plants, have efficiencies that vary from 32 % to 42 %. This depends mainly on the steam parameters. Higher steam perssure and temperatures in the range of 600 ° C and 230 bar have efficiencies around 42 %. We assume a value of 38 % for our case.

and water entering the boiler is assumed at 25oC. The flue gas leaves the boiler at 300oC (all the water formed will be vapour). In addition, a substantial amount of heat is also lost through the boiler wall and other uncounted sources. Calculate the flue gas composition (both dry and wet basis) leaving a boiler.

Heat Loss · Saturated Steam · Steam Turbine · Preferences · Header Steam Mass Flow = Feedwater Mass Flow - Feedwater Mass Flow * Blowdown Rate; Feedwater Mass Flow = Steam Mass Flow / [ 1 - Blowdown Rate] [ Feedwater Mass Flow = 61.9 klb/hr = 60.8 klb/hr / ( 1 - 0.018 ) ] Using the Steam Property Calculator, properties are determined using Deaerator Pressure and Quality = 0 (Saturated Liquid).

compared with the flue gas volume per unit mass. The flue gas volume is derived from the combustible material in the fuel - and only the combustible material contributes to the calorific value. When the flue gas volume, per unit mass, is divided by the heating value, per unit mass, the influence of the inert fuel components is therefore largely