Boiler Waste Heat Power Generation Calculation 20, Boiler Waste Heat Power Generation Calculation

1. It is related to the waste heat temperature and flow rate, and of course, it is also related to the narrow point, end difference and close point temperature difference of the boiler design;

2. The parameters need to ensure that the superheated steam is used to prevent water impact on the blades of the steam turbine;

3. The waste heat should ensure continuity, the flow rate is appropriate, and the temperature is preferably 500.

It is also related to the thermal parameters of waste heat**, such as flow, temperature, calorific value (if combustion), pressure, etc. Knowing these parameters is the only way to calculate the boiler efficiency. If you want to know the efficiency of the unit, you must also know the efficiency of the steam turbine unit.

It seems that you understand some problems, waste heat power generation does not mean the use of boiler waste heat to generate electricity, but the use of all available waste heat sources to generate electricity, such as power plants, chemical plants many processes will produce a large amount of waste heat, this part of the heat is collected, in the waste heat boiler to heat water, so that it produces higher temperature, pressure steam, so as to promote the steam turbine to do work, power generation. Therefore, the temperature requirement for the waste heat source is about 300C°--400C°, which is not an absolute range. If the temperature is as low as 250 °C, then low-temperature thermal power generation technology is generally necessary.

The landlord can consult the relevant boiler factory according to his own waste heat situation, and can let the relevant boiler factory make a plan, under normal circumstances, the medium pressure superheated steam should be about 430 degrees, and the steam for power generation is overheated, and the superheat should be about 200-250, this situation is not necessarily, and the working parameters of the steam turbine are not the same.

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The answer you are looking for: The formula for calculating the thermal efficiency of the waste heat boiler is: thermal efficiency = 100% * grate calorific value - exhaust gas heat loss - exhaust gas heat loss - heat loss of water vapor in flue gas) Grate calorific valueAmong them, the grate calorific value refers to the amount of heat released when the fuel is completely burned in the furnace; Exhaust heat loss refers to the heat taken away by the flue gas during the discharge process; Exhaust gas heat loss refers to the heat loss in the exhaust gas generated by the incomplete combustion of the fuel; The heat loss of water vapor in the flue gas refers to the heat that the water vapor in the flue gas takes away during the discharge process.

By calculating the thermal efficiency, the energy utilization efficiency of the waste heat boiler can be evaluated and evaluated, so as to guide the optimal design and operation, save energy and reduce emissions.

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<>1. Calculate the heat output of the heat boiler: heat output = gasoline consumption of the heat boiler * calorific <> per liter of gasoline

<>2. Calculate the heat input of Huixi heat boiler: heat input = fuel consumption of heat boiler * calorific value of fuel + water replenishment of heat boiler * heat <> of water

<>3. Calculate the thermal efficiency of the Burang heat boiler: thermal efficiency = heat output heat input * 100%.

Summary. Fuel combustion produces heat energy, waste heat**, which drives steam engines to generate electricity.

Fuel combustion produces heat energy, waste heat**, which drives steam engines to generate electricity.

You've done a great job! Can you elaborate on that?

The process flow of waste heat power generation boiler mainly includes three steps: waste heat sales base, waste heat conversion and power generation. In the waste heat stage, the high-temperature exhaust gas discharged from the boiler is used for waste heat and the waste heat is transferred to the device. In the waste heat conversion stage, the waste heat is converted into electronic energy suitable for power generation, which is a necessary conversion device to convert the waste heat into electrical energy.

In the power generation stage, electric energy is sent to the power grid, so as to realize the utilization and power generation of waste heat. This process can greatly improve the utilization rate of energy and reduce energy waste.

Waste heat boiler: according to the exhaust smoke volume x (flue gas inlet enthalpy - flue gas outlet enthalpy) x efficiency.

The amount of smoke can be calculated based on the amount of coal burned or other relevant loads.

The enthalpy of flue gas inlet is calculated according to the temperature of flue gas inlet (that is, the temperature when no waste heat is added).

Of course, it has something to do with the composition of the flue gas, mainly the temperature).

The enthalpy value of flue gas outlet generally depends on how many degrees you import, and then what is it for.

In order to prevent corrosion, it is generally controlled not less than 180 degrees. The highs don't matter.

Efficiency is about the same.

The flue gas composition can be calculated based on the fuel. However, there is generally not much difference, and temperature is the most important seller.

If the temperature of the Pai Town is now below 200, it won't be interesting.

Boiler Power Conversion Calculation Method:

The power (or output) of a boiler is the amount of heat produced by the boiler per hour. The power of the hot water boiler is expressed in mw (1mw = 1000kw) or 10,000 kcal hours (10,000 kcal h).

The power of a steam boiler, also known as evaporation, is the amount of water that can be turned into steam per hour: tonnes per hour (t h) or kilogram per hour (kg h). Of course, it can also be expressed in mw or kw.

In our country, the correspondence between evaporation and power is:

1t h=1000kg h=10,000kcal h=600mcal h.

The units of power are also horsepower (hp) and boiler horsepower (bhp).

1hp = , 1bhp =

The evaporation of steam boilers in Europe and the United States is often marked with the words "at 212", which means that its evaporation refers to the amount of steam evaporated from 212 degrees Fahrenheit to 212 degrees Fahrenheit, that is, the amount of steam evaporated from 100 water to 100. In this way, 1kg of evaporation is equivalent to 540 kcal of heat, which we call "equivalent evaporation", i.e.:

1ton h = 540,000 kcal h.

From this, it can also be deduced that the relationship between boiler horsepower and "equivalent evaporation" is: 1bhp = .

1. Boiler evaporation and boiler thermal efficiency.

1 ton-hour (t h) 60 104 kcal (kcal h) megawatt (mw) 720k kilowatt (kw).

2. Boiler evaporation and boiler horsepower.

1 ton-hour (t h) boiler horsepower (bhp).

3. Boiler pressure engineering unit and international unit of measurement.

1 megapascal (mpa) 10 kgf cm2 (kgf cm2)

4. MPa and Pa.

1 megapascal (MPa) = 106 pascals (PA).

1 Pa (PA) = millibar).

10-5 kgf cm2 (engineering atmosphere) (kgf cm2).

1 Pa millimeter water column (mmH2O).

5. Force and gravity.

1 kilogram force (kgf) = Newton (n).

6. Calorie 1 kilocalorie (kcal) = kilojoule (kj).

7. Volume (volume).

1 cubic meter (m3) = 1000 liters (L).

1 liter (L) = 1000 milliliters (ml).

A 10-ton steam boiler requires a steam supply pressure of 1MPa, a boiler thermal efficiency of 75%, a low calorific value of 5,500 kcal of coal, and how much steam can be produced by one ton of coal.

1MPa steam enthalpy:

Coal consumption: 1 ton of coal steam: 1 ton.

1 kcal = 1 kcal.

1 calorie = joule, 1 kilocalorie = kilojoule (kj). 1 joule s is 1 watt.

Energy joules 1 joule = 1 Newton·meter = 1 watt·second.

Calorific energy electron volts 1 electron volt = joules.

Power watts -- 1 watt = 1 joule second = 1 newton·meter second.

There are many influencing factors for the thermal efficiency of the waste heat boiler, among which the decisive factor is the design, technology and materials of the waste heat boiler equipment itself, the key influencing factor is the temperature of the inlet flue gas, that is to say, the higher the inlet flue gas temperature, the higher the thermal efficiency of the waste heat boiler, the lower the inlet temperature, the lower the thermal efficiency of the waste heat boiler, followed by the exhaust gas temperature of the waste heat boiler, which can obviously judge the thermal efficiency of the waste heat boiler, if the exhaust gas temperature is too high, It can directly indicate that the heat recovery boiler has low thermal efficiency and low exhaust gas temperature, and it can also directly indicate that the heat utilization rate of the waste heat boiler is high, which is the simplest way to judge.

Resources.

HRSG is different from industrial boiler, and the efficiency is generally around 80 according to the user's requirements, which is too high and the cost is high.

The waste heat boiler of the cement plant can generally reach 70 80%, and the boiler of the thermal power plant can reach up to 90%.

Waste heat boiler: according to the exhaust gas volume x (flue gas inlet enthalpy - flue gas outlet enthalpy) x efficiency.

The amount of smoke can be calculated based on the amount of coal burned or other relevant loads.

The enthalpy value of flue gas inlet is calculated according to the temperature of the flue gas inlet (that is, the temperature when there is no waste heat) (of course, it is related to the composition of the flue gas, mainly the relationship between temperature) The enthalpy value of the flue gas outlet generally depends on how many degrees you import, and then what is it for.

In order to prevent corrosion, it is generally controlled not less than 180 degrees. The high point doesn't matter, the efficiency is almost the same.

The flue gas composition can be calculated based on the fuel. However, there is generally not much difference, and the temperature is the most important.

If the exhaust temperature is now below 200, it won't be interesting.

If the boiler exhaust gas temperature is too high, the boiler thermal efficiency is low, and the flue gas will bring a lot of heat into the atmosphere, which not only wastes a lot of energy, but also pollutes the environment. If, through the transformation of the heating surface at the tail of the boiler, the heating surface is extended to increase the heat exchange area and enhance the heat exchange effect, so as to achieve the effect of reducing the exhaust gas temperature and achieving energy saving and emission reduction. The boiler exhaust gas temperature is generally 130 140 degrees Celsius.