How to calculate the sulfur content and flue gas SO2 concentration of coal entering the furnace of t

Sulfur dioxide. How emissions are calculated.

The Notice stipulates that sulphur dioxide emissions can be calculated according to actual monitoring or mass balance calculations, due to thermal power plants.

The application of flue gas monitoring devices is not widespread, so most of them use the mass balance method for calculation:

gso2＝2bfs（1－nso2）（1）

where GSO2 - sulfur dioxide emissions, kg;

b - coal consumption, kg;

f - the conversion rate of sulfur to sulfur dioxide in coal.

Thermal power plant boiler take 0 90;Industrial boilers, furnaces and kilns take 0 85;commercial stoves take 0 80);

s - total sulfur content in coal, ;

NSO2 - desulfurization efficiency, if no desulfurization device is used, NSO2 0

It can be seen that this calculation method involves the calculation of the weight (B), sulfur content (S, total sulfur, the same below) and the type of boiler (F, regarded as a constant by the boiler of the power station) and its desulfurization efficiency (the desulfurization rate of the wet dust collector, NSO2).

Due to the different boilers and their boiler forms and combustion methods, the excess air coefficient of boilers is also different, in order to supervise the sulfur dioxide emitted by boilers on a unified scale, the Ministry of Environmental Protection of the People's Republic of China also defines the temperature K273, atmospheric pressure PA, and boiler flue gas excess air coefficient (coal-fired boiler A, fuel oil, etc.) when defining the emission concentration when formulating the standard.

Suppose there are m tons of coal with a sulfur content of x, then the mass of sulfur contained in these coals is mx tons, and according to the equation of the combustion wax reaction: s o2 so2, we can know that the ratio of the mass of s of the wang crude reaction s to the generated so2 is and linghua 32:64 1:

2, so the mass of the generated SO2 is 2mx tons If the amount of generated SO2 is known, one can also be calculated.

For gaseous fuels.

1. Calculation of theoretical air volume:

When QL 10468KJ M3:

v0 = when ql 14655kj m3:

v0 = In each of the above equations:

v0 - the amount of theoretical disturbed air required for fuel combustion (standard state), m3 kg or m3 m3;

QL - the low calorific value of the fuel application base (standard state), kj kg or kj m3

2. Calculation of actual flue gas volume

When QL 10468KJ M3:

qy = v0（m3/m3）

When QL 14655KJ M3:

qy = v0（m3/m3）

Among the above:

qy - actual flue gas volume (standard state), m3 kg;

Excess air coefficient, =0+δ

0 - excess air coefficient of the furnace;

– Air leakage coefficient.

3. Calculation of total flue gas:

Q Total = B Qy

Among the above:

Q total - total flue gas (holiss standard state), m3 a, b - fuel consumption, kg a

4. Calculation of sulfur dioxide production from burning natural gas

GSO2 = In each of the above equations:

GSO2——Sulfur oxide production of Eryouyou, kg;

v - consumption of gaseous fuel (standard state), m3;

CH2S – Volume of H2S in gaseous fuels, %

Soot generally refers to the gas fuel produced by coal combustion, and there is no such indicator.

Our conventional conversion factor is that the boiler presses, the kiln presses, and the power plant presses.

Then it is the measured concentration multiplied by the air excess coefficient divided by the conversion factor, which is the converted concentration.

The air excess coefficient is calculated as 21 (21-oxygen content) based on oxygen content

1 Calculation of soot generation: m1=b[w(aar)+qnet,arq4 32700]afh

Where: m1—boiler soot generation, t h;

b—Fuel consumption of the boiler under the condition of maximum continuous output, t/h;

w(aar)—the base ash received by the fuel, %;

qnet,ar—the calorific value of the fuel received at the low base of the fuel, kj kg;

Q4—Heat loss of incomplete combustion of solids, %;

afh—fly ash coefficient.

2. Calculation of boiler soot emission: m2=m1(1-c) where: m2 - boiler soot emission, t h;

c—dust removal efficiency, %;

It is also necessary to know what type of furnace it is, and then find out the share of flying back in the manual according to the furnace type, then it can be calculated, such as 90% of pulverized coal furnace. Then the soot emission is 220*16%*90%t h. The soot concentration is 220*16%*90%*1,000,000,000 (110*10000)mg m3.

s: atomic weight 32; o: atomic weight 16; SO2: molecular weight 64, from the above: the amount of sulfur dioxide produced after sulfur combustion is twice the sulfur content.

Sulfur dioxide emissions from coal-fired boilers, currently calculated by the EPA as follows:

1.Sulfur dioxide production (kg) 1600 Coal consumption (ton) Sulfur content ( )2Sulfur dioxide (kg) 1000 gypsum (ton) (1 moisture) gypsum purity 64 172

3.Sulfur dioxide emission (kg) Sulfur dioxide production (kg) Sulfur dioxide emission (kg).

The amount of sulfur dioxide removed is calculated according to the limestone gypsum desulfurization process.

The product of the three numbers multiplied is the total amount.

SO2 concentration * flue gas volume * annual operating time = total SO2 emission years.