Use fuel to generate heat and heat water to form superheated steam at high temperature and high pressure. Then the steam enters the steam turbine along the pipe and continuously expands to do the work. It impacts the turbine rotor and rotates at high speed. , causing the generator rotor to rotate (electromagnetic field). The stator coil cuts the magnetic lines of force and emits electrical energy. Then use the step-up transformer to increase the system voltage, connect it to the grid and transmit the power to the grid. out. Finally, the cooled steam is further boosted by the feed water pump and returned to the boiler to repeat the above cycle process.
Thermal power generation is a method of generating electricity that uses thermal energy generated when combustible materials are burned and converts itinto electrical energy via an electricity production device. China is rich in coal resources. In 1990, it produced 1.09 billion tonnes of coal, of which only 12% was used for electricity generation. Thermal energy production still has enormous potential.
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The energy generated by thermal power plants results in many other by-products and produces many environmental impacts. According to the principle of the Carnot cycle, there always remains a part of the waste heat which must be discharged into the atmosphere via cooling towers or cooled by bodies of water such as natural rivers. Flue gases after burning fossil fuels will be emitted into the atmosphere. Its main components are carbon dioxide, water vapor and other ccomponents such as nitrogen, nitrogen oxides, sulfur oxides, etc. If it's a coal-fired power plant, there will be some as well. be pulverized coal, mercury, etc. The residue after coal combustion also needs to be removed from the boiler, and part can be recycled to make construction materials.
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Thermal power generation
How much radiation does the high-voltage power tower exert on people?
Risks of electromagnetic radiation
Experts have said that electromagnetic radiation exceeding 2 milligauss will cause illness in people, and the first to Bearing the brunt of the problem is human skin and mucosal tissues. Symptoms include swelling of the eyelids, eye congestion, nasal congestion, runny nose, and throat discomfort;
or hivesre repeated, eczema, itching, etc. all over the skin. the body ; vitiligo, silver fever, etc. can occur when the body's immune function is affected. Dandruff, allergic purpura, etc.
The effects of electromagnetic radiation on humans
1. More than 70% of the human body is made up of water. Water molecules rub against each other after being exposed to a certain intensity of electromagnetic radiation, causing the body to heat up, thereby affecting the operating temperature of the body's organs.
2. Non-thermal effect. There are weak electromagnetic fields in the organs and tissues of the human body, which are stable and orderly. Once the interference intensity of the external electromagnetic field is too large, the weak electromagnetic fields in a balanced state may be affected or even destroyed.
3. Cumulative effect. Afters that thermal effects and non-thermal effects act on the human body, if the human body is again subjected to the long-term effects of excessive radiation of electromagnetic waves before the effects on the human body have the time to recover, the effects willThe degree will accumulate, and over time it will form a permanent cumulative impact.
In electromagnetism, the electromagnetic field is a physical field generated by charged objects. A charged object in an electromagnetic field will feel the strength of the electromagnetic field.
The interaction between electromagnetic fields and charged objects (charges or currents) can be described by Maxwell's equations and Lorentz's force law.
What effect does the electromagnetic field have on the properties of water and ice?
The radiation from high-voltage power towers is mainly electromagnetic radiation, which mainly presents the following dangers:
1. Thermal effect< /p>
More than 70% of the human body is made up of water. The positive and negative charge centers inside the water molecule do not overlap. After receiving electromagnetic radiation, this polar molecule. the water molecule will follow the polarity changes of the electromagnetic field and quickly reorganize, causing violent collisions and friction between molecules to generate huge amounts of heat, causing the body to heat up.
When the intensity of electromagnetic radiation exceeds a certain limit, the body temperature or local tissue temperature rises sharply, destroying thermal balance and harming human health. As the intensity of electromagnetic radiation continues to increase, the harmful effects on the human body gradually become greater.
2. Non-thermal effects
Weak electromagnetic fields exist in the organs and tissues of the human body. They are stable and orderly once affected by long-term low temperatures. -frequency electromagnetic radiation from outside, they will be in balance state, the weak electromagnetic field will be destroyed.
After the action of low-frequency electromagnetic radiation on the human body, the body temperature will not increase significantly, but it will interfere with the weak electromagnetic field inherent in the human body, causing changes in blood, lymph and cell protoplasm, causing cell DNA damage and genetic mutations, which can cause leukemia and tumors. They can also cause changes to embryonic chromosomes, leading to malformations in babies or spontaneous abortions in pregnant women.s.
3. Cumulative effect
After the action of the thermal effect and the non-thermal effect on the human body, the damage caused to the human body has not yet had time to repair itself (commonly known as like the internal endurance-resistance of the human body), again, if you are exposed to electromagnetic radiation, the damage will accumulate, and over time it will become a permanent condition, which can even be life-threatening . For people who have been exposed to electromagnetic radiation for a long time, even if the intensity of the electromagnetic radiation they receive is small, various diseases may be induced due to the long exposure time and they should be vigilant .
Principle
Electromagnetic waves generated by interactive changes of electric field and magnetic field The phenomenon of emission or leakage of electromagnetic waves in the air is called raelectromagnetic radiation. Electromagnetic radiation is an invisible and intangible field. The Earth itself, where humans live, is made up of a vast magnetic field. Thermal radiation and lightning on its surface can produce electromagnetic radiation. The sun and other planets also constantly produce electromagnetic radiation from space.
Natural magnetic field, sunlight, household appliances, etc. that surround humans all emit strong varying degrees of radiation. Electromagnetic radiation is an external manifestation of the movement of atoms and molecules within matter.
Reference for the above content: Baidu Encyclopedia - Electromagnetic Radiation
Basically it has no effect on pure water, but it has some effect on ionized water and hard water. It can be eliminated after adding an electromagnetic field.Thanks to these ions, the treated water becomes demineralized water, which is used in some expensive equipment. This has less impact on the ice. After all, it is a solid and the charged particles inside cannot be removed.