Steam water heat conversion method

Steam water heat conversion method
Calculation method for heat exchange capacity
Conversion relationship between calories, kilocalories, and joules
The conversion relationship between calories, kilocalories, and joules, as well as the physical meanings they represent, have been clearly explained in junior high school physics textbooks. Isn't the term 'thermal work equivalent' memorable to everyone?
Cal: The heat absorbed or released by increasing or decreasing the temperature of 1g of water by 1 ℃ is specified as 1 cal, which is the unit for calculating heat.
Kilocaloric (kcal): Kilocaloric, also known as large calorie, 1 kcal=1000 calories, which is clearly the unit for calculating heat.
Joule (J): The unit of measurement for work and energy.
As a form of energy, heat can also be measured in joules, resulting in thermal work equivalent, which is:
1 cal=4.1868 joules (J), 1 kcal=4186.75 joules (J)
Similarly, kilocalorie per hour (kcal/h) can be considered as a unit of power in order to be converted to watts (w, 1 watt=1 joule per second). [/quote]
Calorie lowercase c, kilocalorie (Calorie uppercase C, or written kcal, the former commonly used on food packaging), joule (J), and kilojoule (KJ) are energy units, and the unit conversion formula is:
1KJ=1000 * 1J
1 kcal=1000 * 1 cal
1cal=4.1868 J
1kcal=4186.8 J (1)

The kilowatt hour (kcal/h) and watt hour (J/s also written as w) are power units, and the conversion method for units is:
1Kcal/h=1.163 w=1.163 J/s
It can be found that the energy unit conversion formula can be obtained by multiplying the above equation by 3600s
1 kcal/h * 3600s=1 kcal
1.163J/s * 3600s=4186.8 J
Equation (1) above
Calculation examples
The reaction kettle jacket uses circulating frozen brine for cooling. It is known that the inlet temperature of frozen brine is -15 ℃, the return temperature is -12 ℃, and the flow rate of brine in the pipeline is selected as 1 meter/second. If the pipeline diameter is DN50, the flow rate is:
Q=3600 × V × The cross-sectional area of the pipeline
Q - Unit: cubic meter/hour
V - Unit in meters/second
The cross-sectional area of the pipeline - in square meters=0.785 × D2
D=diameter of the pipeline - in meters
Q=3600 × V × Cross-sectional area of pipeline=3600 × one × zero point seven eight five × 0.052=7.065 cubic meters/hour
2、 Energy provided by 7.065 cubic meters/hour of frozen saline water
Q=cm (T1-T2)=4.18KJ/Kg. ℃ × seven thousand and sixty-five × Kg × 3 ℃=88595 KJ=88595 KJ ÷ 4.18=21195 Kcal=20000 kcal
Known:
1Kcal=1 kcal
1 cal=4.1868 joules (J), 1 kcal=4186.75 joules (J)
C=Specific volume unit: - KJ/Kg. ℃
M=mass unit is --- Kg
(T1-T2)=Temperature difference in ℃
1KJ=1000 * 1J
1 kcal=1000 * 1 cal
1cal=4.1868 J
1kcal=4186.8 J
1 kcal/h * 3600s=1 kcal
1.163J/s * 3600s=4186.8 J
There are three ways to express the output of a hot water boiler, namely, kilocalorie per hour (Kcal/h), ton per hour (t/h), and megawatt (MW).
(1) Big calorie/hour is an expression in the metric system, which represents the amount of heat supplied by a hot water boiler per hour.
(2) "Ton" or "steam ton" is a common term borrowed from steam boilers, which means that the heat supplied by a hot water boiler per hour is equivalent to the heat absorbed by heating a certain mass (usually expressed in tons) of water from 20 ℃ and vaporizing it all into steam.
(3) Megawatt (MW) is the unit of power in the International System of Units, with the basic unit being W (1MW=106W). This expression should be used in official documents.
The conversion relationship between the three expressions is as follows:
600000 kcal/hour (60 × 104Kcal/h) ≈ 1 steam ton/hour [1t/h] ≈ 0.7MW
3、 How many tons of steam can one ton of coal produce?
If conducting calculations, it is necessary to clarify the quality of coal and the requirements for generating steam, and then proceed with the following data:
1. Standard coal is an equivalent concept based on a certain combustion value. The low calorific value of 1 kilogram of standard coal is specified as 7000 kcal or 29274 kJ.
2. Table of Reference Calorific Value and Conversion Coefficient to Standard Coal for Various Energy Sources
Energy Name Average Low Calorific Value Converted to Standard Coal Coefficient
Raw coal 20908 kJ (5000 kcal)/kg 0.7143 kg standard coal/kg
Washed coal 26344 kJ (6300 kcal)/kg 0.9000 kg standard coal/kg
3. Standard coal required to generate 1KG of steam at various pressures
1kg 10.0MPa steam=0.131429 kg standard coal
1kg 3.5MPa steam=0.125714 kg standard coal
1kg 1.0MPa steam=0.108571 kg standard coal
1kg 0.3MPa steam=0.094286 kg standard coal
1kg less than 0.3MPa grade steam=0.078571 kg standard coal
Raw coal 20908 kilojoules (5000 kilocalories)/kilogram, how many tons of steam can be produced from 1 ton of coal?

Q=5000 kcal × 1000=5 million kcal ÷ 600000 kcal/ton of steam=8.3 tons of steam

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