When we have determined the total installed scale, we need to confirm the single-machine power. For example, when facing a project with a total capacity of 3MW, should we use one 3MW, two 1.5MW, three 1MW, or six 0.5MW?
In fact, the answer is not the only one. As a user, we need to consider the cost and benefit of investment. As a supplier, we need to consider how to launch our products. Sometimes the two are not uniform, and users sometimes need to consider factors other than technology and economy. Lao Liu here leaves aside other irrelevant issues and only discusses technical issues.
The smaller the power of a single generator and the larger the number of units, the more flexible the operation and the stronger the ability to deal with special situations. But correspondingly, the more complex the operation and maintenance work is, the higher the cost may be.
There are two kinds of unexpected situations to be considered in unit selection: first, when the methane production is insufficient (the anaerobic fermentation system has just started, the raw material is insufficient, the process is problematic, etc.), the generator can not be full-blown; second, when the generator fails (or maintains), the generator needs to be shut down, and the methane is facing waste.
The plan to deal with the shortage of biogas production is to install multiple units. When the gas quantity is insufficient, some units can be shut down, the operation efficiency can be improved, and the operation and maintenance cost can be reduced. Some projects can even consider the plan in batches from the beginning.
The scheme to deal with generator faults is to rationally allocate the capacity of gas storage tank and generator unit. The regulation of gas storage tank in the code of biogas power generation is that "the capacity of gas storage device should be designed according to the consumption of gas whose total rated power is greater than 2 hours when the biogas generating unit is running continuously".
The larger the biogas power generation project, the larger the storage tank, the stronger the ability to deal with fluctuations. In stable operation, the gas volume is generally maintained at about 50%0%. Calculated, 3000 m3 storage tank, can accept the -W unit 3-5 hours of downtime, general small fault enough to deal with.
The previous formula also mentions an installed margin k, which is generally 1.08-1.20. One of the purposes of this installed margin is to slightly increase the installed capacity and increase the flexibility of operation. Even if a generator unit has a serious fault and can not run for a while, it can also have a backup capacity on top, which will not cause too much waste. At the same time, the daily operation allows the unit to have margin, slightly reduced load operation, the failure rate will also be reduced.
According to experience, the installed number of biogas power generation projects is generally controlled at about 2-4 units. Taking 3MW as an example, 2 1.5MW, 3 1MW are reasonable schemes. If cost permits, 3 1.2MW, or even 4 0.8MW are acceptable. The final choice should be determined by combining other factors of the project, such as cost, power generation efficiency and the views of the owner.
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