A cubic meter of water at a height of 20 meters has a potential energy of 1,000 kg*10 m/s2*20 m =200,000J =200 kJ. If we consider a conversion efficiency of 30%, the electricity that can be generated underwater is approximately 200*30% = 60 kJ. Because 1 kWh = 1000 W * 3600 s = 3600 kJ, so 36 kJ = 0.01 kWh.
Therefore, if a cubic meter of water falls from a height of 20 meters to produce electricity, based on a conversion efficiency of 30%, the electricity can be generated is approximately 0.01 kilowatt hour (degree). .
What can a ton of water do
Water is called the source of life From time to time we need to drink water, but we are very careful about it. drinking water. Usually we heat the water before drinking it. It is said that it can effectively eliminate bacteria in water. When we boil water, we suddenly ask ourselves a question: how high does the watercan it be heated?
Can water be heated up to 1000 degrees Celsius? When you put water in a sealed container and heat it, what happens? The first reaction is that if we continue to heat the water, it can reach very high temperatures, for example 1000 degrees Celsius. Can water be heated to 1000 degrees Celsius? Everything needs proof. For this question, we should find the answer through experiments. Intentions are better than actions. The experimental method is very simple, a fire, a pot and a thermometer. Okay, experiment. Now, watching the number on the thermometer rise, we can't help but smile with satisfaction. unpleasant things in life eight out of ten." 9. We soon discovered that when the water temperature reaches around 100 degrees Celsius, it will never rise again. Why?
Because the water is unstable andis a liquid and water molecules are in water. It can propagate spontaneously in the air, that is to say it goes from liquid water to gaseous water vapor. The higher the water temperature, the more water vapor is generated per unit of time. the higher the production pressure. When the pressure generated by the steam is equal to the pressure of When external pressure is applied, the water begins to boil. In this case, the water begins to turn into steam and the steam continues to set. keeps the heat away and the water temperature no longer increases.
Therefore, as the external pressure increases, the pressure generated by the water vapor must reach a higher value for the water to boil. higher temperature. In other words, to heat water to a higher temperature, you need to put the water in a sealed container to increase the pressure. The next question is: can water be heated to 1000 degrees Celsius in a sealed container? What happens when you heat water in a sealed container? After careful consideration, we decided to upgrade ours. Fortunately, we were the ones who had the money, and we quickly found professional equipment that integrated waterproofing, pressurization, heating and reality. analysis of temporal data
Steam for thermal power plants Why not burn it at 1000 degrees
Question 1: What can a ton of water do 1.A ton of water is equivalent to 1000 liters of water.
One liter of water can: 1. Pour five cups of water. 2. You can wash a car. 3. Can water 6 flower pots. 4. Enough for a person living in the disaster area to drink for 2 days. 5. You can wash your hair once. 6. Can wash 1 item of clothing. 7. Clean 30 square meters of floor... This is a household task that a liter of water can accomplish, but what about 1,000 lliters of water (1 ton)? Multiply the activities above by 1000 times, okay~ To put it simply:
It can be used by a family of three for two months (the ultimate ultra -low-carbon water saving) or 3 days (At present, urban households include bathing, cooking, washing, washing, flushing, etc.).
For mainland China, the unnecessary use of 1 ton of water can generate 100 kilowatt hours of electricity (potential hydroelectric power), 2,500 kilowatt hours of electricity (steam thermal power), but the heat loss must be excluded), and can melt 40 kilograms of steel (steel water), produce 500 kg of fertilizer (petrochemical water), weave 200 meters of fabric (textile water), produce 3,000 pencils, produce 200 kg of cement, produce 250 kg of edible oil, produce 2,000 kg of oil, produce 11 televisions, produce 100 kg of paper, produce 2,000 pieces of brickRed ues can be used to make 80 sets of school uniforms (all water used in manufacturing)... There are too many to list, so let me give you a formula to calculate for yourself :
< p> If the total height of the fall is H meters, the flow rate is Q cubic meters of water per second, and the power is expressed in (kW) , the power delivered by the water is P = 9.8ηQH (kW), where eta is the overall efficiency. Let's take an example: there is a power plant with a total height of 100 meters and a flow rate of 10 cubic meters per second. The theoretical output power it can produce is: P = 0.8×0.9×10×100= 8,820 (. kW)
Question 2: How much How long can a person use a ton of water? Daily water consumption, drinking water, laundry and cooking, etc. One ton of water can be used for 5-6 days at most. The people upstairs are really talented. A ton of watercan be used for 20 to 30 days. don't you need water to wash clothes? Don't you need water to flush the toilet? Do you need water for cooking and washing vegetables? ? If it's summer, you should shower every day and wash your clothes every day. A ton of water will only last 3 to 4 days
Question 3: How long does a ton. The amount of water that can be used depends on how it is used
Question 4: Can an ordinary family use one ton of water per day According to the quota , each inhabitant consumes 120 to? 180 liters of water per day, and a family of three consumes approximately 10.8 to 16.2 tons of water per month.
Question 5: What can a ton of water do? On an aircraft carrier, a steam catapult requires a ton of water to eject a plane
Chengdu's first mini fire truck is put into service. A ton of water canbe used to spray water for 40 minutes
Question 6: How long can a ton of water last? As long as the water meter isn't broken. . . You probably won't be able to use that much. . .
Question 7: How much does a ton of water cost? Our price here is 3.75 yuan/ton.
Question 8: Generally, how long can a ton of water be used by two people? It depends on water usage habits and the season. If it gets used a lot, it depends. can be used within a few days. Finish if it is small, it can also be used for ten days or half a month.
Question 9: How long can an ordinary household use a ton of water? A family of three can use it for about 5 days
Question 10: How much does a ton of water cost? Can anyone give the most appropriate example? Have-Have you ever seen the Table of Eight Immortals? It's almost that big!
In terms of steam power generation efficiency, the higher the steam pressure and temperature, the better, but in terms of boiler efficiency, it is the opposite is true. Do you know that if the steam temperature is 1000°C, what must be the temperature of the fumes evacuated? (Heat can of course be transferred in the opposite direction.) From a heat transfer perspective, the greater the temperature difference between the fire in the oven and the water in the pot, the greater the transfer rate of heat is rapid. the surface area can also be smaller and the boiler can also be smaller.
In terms of materials for boilers, pipes, valves, generators, etc., as the steam temperature increases, the corresponding pressure also increases and the material requirements for vessels under ppressure are now more difficult. to find people capable of withstanding such temperatures and corresponding pressures.
The boiler is a special pressure vessel and its safety is the most important. As the temperature and pressure of the steam increases, its safety factor also decreases.
When the steam reaches 1000°C, water and steam already coexist. The thermal cycle of water cannot therefore form in the pot, which is extremely detrimental to heat transfer. As for whether steam decomposes into hydrogen and oxygen at 1000°C, I haven't checked yet.
Things in the world are always divided into two, with advantages and disadvantages. Engineering problems must be considered holistically. However, with the continuous improvement of science and technology, new processes and materials are constantly emerging. The CIndustrial boilers are evolving towards high pressure and large scale.