I would like to ask how biogas production
2.2.1 fixed arch cover hydraulic digesters?The fixed arch cover hydraulic tank has a cylindrical shape (see Figure 2.1), a sphere (see Figure 2.2) and an ellipsoid (see Figure 2.3). The gas chamber on the upper part of the pool body is completely closed, and with the constant production of methane, the methane pressure increases correspondingly. The continuously increasing air pressure forces a part of the material liquid in the methane tank into the water pressure chamber communicated with the pool body, so that the liquid level in the water pressure chamber is increased. As a result, the water level in the water tank with the liquid level in the body will produce a water level difference, the water level difference is called "water pressure" (that is, the U tube methane pressure meter display value). When the utility model is used for gas, the methane switch is opened, and the methane is discharged under the water pressure; when the methane is reduced, the material liquid between the water pressure returns to the pool body, and the water level difference is continuously decreased, and the methane pressure is correspondingly reduced. The utility model uses a part of the material liquid to move back and forth, which causes the water pressure to change repeatedly to store and discharge methane.There are generally two kinds of biogas digesters, one is made of ordinary cement, and the other is made of glass fiber reinforced plastic, glass fiber is divided into ordinary type and patent type
Biogas and its production process?Biogas is a kind of combustible gas produced by microorganism fermentation under the condition of certain temperature, humidity and pH. As the gas was first found in swamps, lakes and ponds, it was called methane. Methane contains a variety of gases, the main component is methane (CH4). The decomposition of organic matter, the process of producing methane. According to the effect of various kinds of bacteria in biogas fermentation, biogas bacteria can be divided into two categories. The first kind of bacteria is called "decomposing bacteria", which is used to decompose complex organic matter into simple organic matter and carbon dioxide (CO2). They have the special decomposition of cellulose, called cellulolytic bacteria; a special decomposition of protein, called protein decomposing bacteria; a special decomposition of fat, called fat decomposing bacteria; second kinds of bacteria called methane bacteria, usually called methane bacteria, it is the function of the organic matter and carbon dioxide oxidation or reduction of methane. Therefore, organic materials into biogas process, two processes like factory production of a product: the first is the decomposition of organic bacterial manure and straw processing, weeds and other complex compounds into semi-finished products: simple structure; then the methane bacteria under the action of the compound processing into products simple. The formation of methane. ?
2.1.2 biogas composition?Biogas is a mixture of gases, the main component is methane, followed by carbon dioxide, hydrogen sulfide (H2S), nitrogen and other components. In the composition of methane, the combustible components include methane, hydrogen sulfide, carbon monoxide and heavy hydrocarbon. The content of methane in biogas is 55% to 70%, the content of carbon dioxide is from 28% to 44%, and the average content of hydrogen sulfide is about 0.034%.Physical and chemical properties of 2.1.3 biogas?Methane is a colorless, smell, toxic, smelly gas, the main component of methane at room temperature is a colorless, tasteless, odorless, non-toxic gas. The molecular formula of methane is CH4, a simple hydrocarbon compound with a carbon atom and four hydrogen atoms. The weight ratio of methane to air is 0.54, about half lighter than air. Methane solubility is very small, at 20 degrees C, 100 Pa, the volume of water per unit of volume, only 3 units of dissolved methane volume. ?
Methane is a simple organic compound, is a high-quality gas fuel. The combustion is blue flame, the highest temperature can reach 1 - 400?. Pure methane per cubic meter calorific value of 36 thousand and 800 coke. The calorific value of methane per cubic meter is about 23 thousand and 400 coke, which is equivalent to the amount of heat released after the full combustion of the diesel fuel of 0.55 kg or 0.8 kg of coal. From the thermal efficiency analysis, the amount of heat per cubic meter of methane can be used, equivalent to 3.03 kilograms of coal burning heat. ?2.2 types of household biogas digesters?With the promotion of biogas science and technology development of our country and rural household biogas, according to local requirements and temperature, geological conditions, household biogas digester has a hydraulic tank, fixed arch cover big uncovery hydraulic tank, hanging tube type hydraulic tank, hydraulic tank, meandering cloth top return water pressure tank separation, floating Bell Pool, pool, semi plastic type plastic tank and tank tank. Although a variety of forms, but generally boil down by hydraulic biogas digesters, semi floating cover type, plastic type and tank type biogas digesters four basic types of changes. The biogas digester, which is matched with the four in one ecological greenhouse model, is generally a hydraulic pressure methane tank.
