The differences between methanol and ethanol are different structures, different toxicity, different uses and different production methods.
Methanol and ethanol are both alcohol compounds, but their chemical structures are different. Methanol consists of one methyl group and one hydroxyl group, while ethanol consists of one ethyl group and one hydroxyl group. Methanol is a toxic substance, while ethanol is a safe alcoholic beverage that can provide relaxation and pleasure when consumed in moderation.
Methanol is commonly used as a solvent, fuel and chemical raw material, while ethanol is mainly used to make alcoholic beverages, disinfectants and solvents. The production methods of methanol and ethanol are also different. Methanol is mainly prproduced from syngas by formaldehyde synthesis, while ethanol is mainly produced from starch or sugar by fermentation.
Main uses of methanol
1. Fuel: Methanol can be used as an alternative fuel in automobiles, ships, generators and other areas. It can be blended with gasoline to form methanol gasoline or methanol diesel to reduce dependence on petroleum and reduce waste gas emissions.
2. Chemical raw materials: Methanol is an important raw material for many chemicals, such as formaldehyde, methyl methacrylate, methanol ester, etc. These chemicals are widely used in plastics, synthetic fibers, coatings, adhesives, medicine and other fields.
3. Pesticides and insecticides: Methanol can be used as a maraw material for the preparation of pesticides and insecticides, such as imidacloprid pesticide, carbendazim fungicide, etc. These chemicals are used in agriculture to protect crops from pests and diseases.
4. Fuel Cells: Methanol can be converted into electrical energy using fuel cells to generate clean energy. This technology is widely used in mobile energy, aerospace and other fields.
A boiler consists of two parts: a pot and an oven. The original meaning of a pot refers to a container of water heated over a fire, and an oven refers to a place. where the fuel is burned. The hot water or steam generated in the boiler can directly provide the thermal energy needed for production and life, or it can be converted into mechanical energy through a steam device, or the energymechanical energy can be converted into electrical energy via a generator. Boilers that provide hot water are called hot water boilers. They are mainly used in everyday life and also have a small number of applications in industrial production. The boiler that generates steam is called a steam boiler, also called a steam generator, often called a boiler. It is an important part of the steam power generation device and is mainly used in thermal power plants, ships, locomotives and industries and mines. businesses. Boilers are subjected to high temperatures and pressures, so safety issues are very important. Boiler capacity can be expressed as the rated evaporation capacity or the maximum continuous evaporation capacity. The nominal evaporation capacity is the quantity of vapor produced continuously byunit of time under a specified outlet pressure, temperature and efficiency. Maximum continuous evaporation capacity is the maximum amount of vapor that can be produced continuously per unit time under the specified outlet pressure and temperature. Steam parameters include boiler steam pressure and temperature, which generally refers to the pressure and temperature of the superheated steam leaving the superheater and reheater. If there is no superheater or reheater, they refer to the pressure and temperature of the saturated steam. boiler outlet. Feed water temperature refers to the economizer inlet water temperature. If there is no economizer, it refers to the drum inlet water temperature. Boilers can be classified in different ways. Boilers can be divided into industrial boilers, boilerseras of power plant, marine boilers and locomotive boilers according to their uses according to the outlet pressure of the boiler, they can be divided into low pressure, medium pressure, high pressure, ultra high pressure, subcritical pressure. , supercritical pressure and other boilers; according to the circulation method, they can be divided into natural circulation boilers and auxiliary circulation boilers (i.e. forced circulation boilers), once-through boilers and compound circulation boilers according to the combustion methods, the boilers are divided into chamber furnaces, layer furnaces and; boiling furnaces. Regarding the water vapor system, after the feed water has been heated to a certain temperature in the heater, it enters the economizer through the water supply pipe. After further heating, it is sent to the drum, mixes with eau from the pot and. then flows to the water wall inlet collector. Water in the water-cooled wall tube absorbs radiant heat from the furnace to form a steam-water mixture that reaches the drum through the riser tube. Water and steam are separated by the steam-water separation device. The separated saturated steam flows from the upper part of the drum to the superheater, continues to absorb heat and becomes superheated steam at 450°C, then is sent to the steam turbine. When it comes to combustion and combustion air systems, the fan sends the air into the air preheater to heat it to a certain temperature. The main components of the boiler, such as furnace, drum, burner, water wall superheater, economizer, air preheater, frame and furnace wall, constitute the essential part of the boiler. heat production and are called boiler bodies. Both partiesThe most important parts of the boiler body are the furnace and the drum. The furnace, also called the combustion chamber, is the fuel combustion space. The furnace in which the solid fuel is placed on the grate and burned on the fire bed is called layered combustion furnace, also known as fire bed furnace; the furnace in which liquid, gaseous or powdered solid fuel is sprayed into the fire chamber for combustion is called a chamber. a fluidized bed furnace; the air flow is used to rotate the coal particles at high speed. The cylindrical furnace with powerful fire is called cyclone furnace. The cross section of the oven is generally square or rectangular. The fuel burns in the furnace to form high temperature flames and combustion gases, so the furnace walls around the furnace are made of high temperature resistant materials and insulation materials. TubesWater-cooled wall-mounted heaters are often laid on the inner surface of the furnace wall, which not only protects the furnace wall from burnout, but also absorbs a large amount of radiant heat from the flame and flue gases at high temperature. The design of the furnace must fully take into account the characteristics of the fuel used. 1. Boilers can be classified based on their purpose. The boilers can be used as thermal boilers and heating boilers. Electric boilers include power plant boilers, ship boilers and locomotive boilers, etc., which are used for electricity generation, ship power and locomotive power. Heating boilers include steam boilers, hot water boilers, heat pipe boilers, hot blast furnaces and heat transfer heating furnaces, etc.., and obtain steam and hot water as a result. Hot air and heat transfer, etc. 2. Classification according to the structure of the boiler body. According to the structure of the boiler, it is mainly divided into fire tube boilers and water tube boilers. Fire tube boilers include vertical boilers and horizontal boilers, and water tube boilers include horizontal water tube boilers and vertical water tube boilers. 3. Classification according to the type of fuel used in boilers. Depending on the type of fuel used in the boilers, the categories are coal-fired boilers, oil-fired boilers, and gas-fired boilers, as well as coal upgrade technology. fire boilers, substitute products for oil and gas furnaces --- pulverized coal boilers, dual-purpose gas boilers.Boilers etc. Coal fired boilers can bere divided into layer boilers, chamber boilers and boiling boilers according to their combustion methods. 4. According to the classification of boiler capacity, those with an evaporation capacity of less than 20 t/h are called small boilers, those with an evaporation capacity of more than 75 t/h are called large boilers, and those with a evaporation capacity between the two are called. called medium-sized boilers. 5. According to the classification of boiler pressure, boilers below 2.5 MPa are called low pressure boilers, those above 6.0 MPa are called high pressure boilers, and those with pressure between the two are called medium pressure boilers. There are also ultra high pressure boilers, subcritical boilers and supercritical boilers. 6. Classification according to the boiler water circulation form. The forms of circulationBoiler water ion can be divided into natural circulation boilers and forced circulation boilers (including once-through boilers). 7. According to the shape of the device, it can be divided into quick installation boilers, assembled boilers and bulk boilers. There are also wall-mounted boilers, vacuum boilers and modular boilers.