Seek the construction plan of the biogas digester and the construction organization design

I only have housing construction and municipal administration, and I don't quite understand what a biogas digester is.

In China, room temperature fermentation is generally used, and its suitable conditions are:

1. Temperature 25-35.

2. pH, when the pH is low, it can be adjusted with limestone or plant ash.

3. The ratio of carbon to nitrogen is 25-30:1.

4. Sufficient organic matter, generally adding kilograms of solid raw materials per cubic meter of biogas digester is appropriate.

5. The appropriate volume, the volume of the fermentation tank is low in the fermentation efficiency at room temperature per cubic meter per pig, and it is only a first-class treatment, and the biogas slurry and biogas residue need to be further treated, otherwise it can cause secondary pollution.

1. The construction of the biogas digester should be coordinated with the house and the surrounding environment, so as to maintain the beauty and hygiene of the environment; 2. In order to shorten the conveying distance of biogas, the biogas digester should be as close to the kitchen as possible, and the distance should not exceed 30 meters. 3. The biogas digester should be kept away from roads and railways, and avoid bamboo forests and woods, so as not to cause vibration and damage to the biogas digester. 4. Try to choose a place with a good foundation, low groundwater level and leeward and sunny place to build a pool.

5. The biogas digester should be connected with the pig pen and toilet to achieve the "three combinations" and facilitate the self-flow of manure into the pool. 6. Pond construction technicians should be trained in biogas technology, must hold a certificate issued by the biogas administrative department, and should carry out construction and acceptance in accordance with national standards.

Biogas digester is a kind of green and environmentally friendly project. It is designed according to the principle of "four-digit height integration", and achieves the perfect combination of biogas digester and solar greenhouse, planting and aquaculture.

(1) Gas production pressure?

The biogas pressure in a hydrostatic digester is a variable value that varies with the conditions of gas production and consumption. Therefore, the working process of hydraulic biogas digester is a process of alternating alternating change of air pressure water, water pressure gas, and its pressure is always in a floating and stable state, and the numerical value cannot maintain a definite value. In order to facilitate gas production and ensure the relative stability of the pressure during combustion, the normal working air pressure in the design pool is 80 cm water column (pressure p=0?).

08 kg cm? 2) It is advisable to limit the maximum air pressure in the pool to 120 cm water column

2) Gas production rate?

China's rural biogas digester is generally fermented at room temperature, in the design of the biogas digester, with reference to the data measured by the test and the production practice, the gas yield standard is as follows: when the temperature change range is 10 28 and the dry matter content in the fermentation feed is 6 10%, the gas production per cubic meter of fermentation feed per day is 01～0?

3 meters? 3. The gas production is strong in summer and poor in winter. Therefore, the average design gas production rate of the natural temperature fermentation digester can be 0?

15 meters? 3 meters? 3. Day

3) Gas storage volume?

The so-called gas storage volume refers to the effective volume between the water pressure of the hydraulic biogas digester, the volume of the floating hood gas box of the floating hood biogas digester and the air bag volume of the air bag biogas digester. The determination of gas storage volume is related to gas consumption. Rural household biogas digester produces gas day and night, without considering the night lighting gas, just cooking gas during the day, so when designing the gas storage volume, only consider the biogas produced by being able to store for 12 hours (night), that is, 50% of the gas production of storage day and night is enough

v gas storage = v effective gas production rate 50%?

4) the determination of the volume of the biogas digester is a key problem in the design according to the purpose of the digester and the maximum daily gas consumption. Specifically, the determination of the volume of the biogas digester is closely related to the quality of fermentation raw materials, gas production rate and energy consumption standards, that is, it is related to the current living standards of farmers and the level of technology and technology for the production of biogas.

5) Dosing volume?

The feeding volume (i.e. effective volume) of the biogas digester should be determined according to different gas storage methods. For the hydraulic biogas digester, the design maximum feeding capacity is not more than 90% of the volume of the main pond, and the design maximum feeding capacity of the biogas digester of the floating hood gas storage and air bag gas storage can be considered according to 95% of the volume of the main pool

8) (9) The negative pressure in the pool is not considered.