典型有機廢棄物厭氧發(fā)酵產項目，沼氣發(fā)電工藝流程，厭氧發(fā)酵產出沼氣之后，行凈化和儲存，再進入沼氣發(fā)電系統(tǒng)產生電能，同時回收余熱返回預處理系統(tǒng)和厭氧發(fā)酵系統(tǒng)。如果余熱不夠，還需要配套沼氣鍋爐進行產熱（即使余熱夠用，一般鍋爐也都是要上的，用于調試期間及發(fā)電機檢修期間供熱）。同時還應設置應急火炬，用于沼氣凈化系統(tǒng)或者沼氣利用系統(tǒng)故障時，沼氣的應急處理。
A typical organic waste anaerobic fermentation production project involves a biogas power generation process. After biogas is produced through anaerobic fermentation, it is purified and stored before entering the biogas power generation system to generate electricity. At the same time, the residual heat is recovered and returned to the pretreatment system and anaerobic fermentation system. If the waste heat is insufficient, it is also necessary to provide a biogas boiler for heat generation (even if the waste heat is sufficient, generally, the boiler is required for heating during commissioning and generator maintenance). At the same time, emergency flares should also be installed for emergency treatment of biogas when the biogas purification system or biogas utilization system fails.
沼氣發(fā)電技術較為成熟，發(fā)電機組有進口的，也有國產的。國產機組相對投資較低，但是發(fā)電效率也較低（進口發(fā)電機發(fā)電效率35%~40%，國產發(fā)電機組發(fā)電效率25%~35%）。如果發(fā)電量較大，電能可成為項目主要收益來源，建議選擇進口發(fā)電機組。如果項目投資緊張，且發(fā)電量較小，可以選擇國產發(fā)電機組。

The biogas power generation technology is relatively mature, with both imported and domestic power generation units. Domestic units have relatively low investment, but their power generation efficiency is also low (35% - 40% for imported generators, 25% - 35% for domestic generators). If the power generation capacity is large, electric energy can become the main source of income for the project. It is recommended to choose imported power generation units. If the project investment is tight and the power generation capacity is small, domestic power generation units can be selected.
沼氣發(fā)電系統(tǒng)主要由沼氣發(fā)電機組、余熱回收裝置、煙氣凈化裝置組成。發(fā)電機以沼氣為燃料，一部分熱能轉化成電能輸出，可以用于項目自身或并入電網。還有一部分熱能，會通過發(fā)動機機體和煙氣散發(fā)出來（約為總熱量的50%~60%），因此可對這部分熱能進行回收。回收的熱量可用于前端工藝（預處理加熱和厭氧罐保溫），如果熱量不夠，可通過沼氣鍋爐進行補充。發(fā)電機組產生的煙氣回收完熱量之后，進入煙氣凈化系統(tǒng)，去除煙氣中的氮氧化合物，凈化后的煙氣進行高空排放。
The biogas power generation system is mainly composed of biogas power generation units, waste heat recovery devices, and flue gas purification devices. The generator uses biogas as fuel, and part of the thermal energy is converted into electrical energy for output, which can be used for the project itself or integrated into the power grid. There is also a portion of thermal energy that is emitted through the engine body and smoke (approximately 50% to 60% of the total heat), so this portion of thermal energy can be recovered. The recovered heat can be used for front-end processes (pre-treatment heating and anaerobic tank insulation), and if the heat is insufficient, it can be supplemented by biogas boilers. After the heat is recovered from the flue gas generated by the generator unit, it enters the flue gas purification system to remove nitrogen oxides from the flue gas, and the purified flue gas is discharged at high altitude.