Biomass power generation is a type of renewable energy generation that utilizes the biomass energy possessed by biomass. It includes direct combustion of agricultural and forestry waste for power generation, gasification of agricultural and forestry waste for power generation, waste incineration for power generation, landfill gas for power generation, and biogas for power generation.

生物質(zhì)發(fā)電包括農林廢棄物直接燃燒發(fā)電、農林廢棄物氣化發(fā)電、垃圾焚燒發(fā)電、垃圾填埋氣發(fā)電、沼氣發(fā)電等。

Biomass power generation includes direct combustion of agricultural and forestry waste for power generation, gasification of agricultural and forestry waste for power generation, waste incineration for power generation, landfill gas for power generation, biogas for power generation, etc.

1、農林廢棄物直接燃燒發(fā)電原理

1. Principle of direct combustion of agricultural and forestry waste for power generation

直接燃燒發(fā)電是將生物質(zhì)在鍋爐中直接燃燒，生產(chǎn)蒸汽帶動(dòng)蒸汽輪機及發(fā)電機發(fā)電。生物質(zhì)直接燃燒發(fā)電的關(guān)鍵技術(shù)包括生物質(zhì)原料預處理、鍋爐防腐、鍋爐的原料適用性及燃料效率、蒸汽輪機效率等技術(shù)。

Direct combustion power generation refers to the direct combustion of biomass in a boiler to produce steam and drive a steam turbine and generator to generate electricity. The key technologies for biomass direct combustion power generation include biomass raw material pretreatment, boiler anti-corrosion, boiler raw material applicability and fuel efficiency, steam turbine efficiency, and other technologies.

燃燒秸稈發(fā)電時(shí)，秸稈入爐有多種方式：可以將秸稈打包、粉碎造粒(壓塊)、或打成粉或者與煤混合后末打入鍋爐。其生產(chǎn)過(guò)程為：將秸稈等生物質(zhì)加工成適于鍋爐燃燒的形式(粉狀或塊狀)，送入鍋爐內充分燃燒，使儲存于生物質(zhì)燃料中的化學(xué)能轉變成熱能；鍋爐內的熱后產(chǎn)生飽和蒸汽，飽和蒸汽在過(guò)熱器內繼續加熱成過(guò)熱蒸汽進(jìn)入汽輪機，驅動(dòng)汽輪發(fā)電機組旋轉，將蒸汽的內能轉換成機械能，后由發(fā)電機將機械能變成電能。

When burning straw for power generation, there are various ways for straw to be fed into the furnace: straw can be packaged, crushed into granules (crushed), or crushed into powder, or mixed with coal and finally fed into the boiler. The production process is to process biomass such as straw into a form suitable for boiler combustion (powder or block), and send it into the boiler for full combustion, converting the chemical energy stored in biomass fuel into thermal energy; The heat in the boiler generates saturated steam, which is further heated into superheated steam in the superheater and enters the turbine, driving the turbine generator unit to rotate, converting the internal energy of the steam into mechanical energy. Finally, the generator converts the mechanical energy into electrical energy.

2、生物質(zhì)氣化發(fā)電原理

2. Principles of biomass gasification for power generation

生物質(zhì)氣化發(fā)電技術(shù)是指生物質(zhì)在氣化爐中轉化為氣體燃料，經(jīng)凈化后直接進(jìn)入燃氣機中燃燒發(fā)電或者直接進(jìn)入燃料電池發(fā)電。氣化發(fā)電的關(guān)鍵技術(shù)之一是燃氣凈化，氣化出來(lái)的燃氣都含有一定的雜質(zhì)，包括灰分、焦炭和焦油等，需經(jīng)過(guò)凈化系統把雜質(zhì)除去，以保證發(fā)電設備的正常運行。

Biomass gasification power generation technology refers to the conversion of biomass into gas fuel in a gasifier, which is purified and directly burned in a gas engine for power generation or directly fed into a fuel cell for power generation. One of the key technologies for gasification power generation is gas purification. The gasified gas contains certain impurities, including ash, coke, and tar, which need to be removed through a purification system to ensure the normal operation of the power generation equipment.

生物質(zhì)氣化發(fā)電技術(shù)的基本原理，是把生物質(zhì)轉化為可燃氣，再利用可燃氣推動(dòng)燃氣發(fā)電設備進(jìn)行發(fā)電。它既能解決生物質(zhì)難于燃用而且分布分散的缺點(diǎn)，又可以充分發(fā)揮燃氣發(fā)電技術(shù)設備緊湊而且污染少的優(yōu)點(diǎn)，所以，氣化發(fā)電是生物質(zhì)能有效、潔凈的利用方法之一。

The basic principle of biomass gasification power generation technology is to convert biomass into combustible gas, and then use combustible gas to drive gas power generation equipment for power generation. It can not only solve the shortcomings of biomass being difficult to burn and distributed dispersedly, but also fully utilize the advantages of compact equipment and low pollution of gas power generation technology. Therefore, gasification power generation is one of the most effective and clean utilization methods of biomass energy.

氣化發(fā)電過(guò)程主要包括三個(gè)方面：一是生物質(zhì)氣化，在氣化爐中把固體生物質(zhì)轉化為氣體燃料；二是氣體凈化，氣化出來(lái)的燃氣都含有一定的雜質(zhì)，包括灰分、焦炭和焦油等，需經(jīng)過(guò)凈化系統把雜質(zhì)除去，以保證燃氣發(fā)電設備的正常運行；三是燃氣發(fā)電，利用燃氣輪機或燃氣內燃機進(jìn)行發(fā)電，有的工藝為了提高發(fā)電效率，發(fā)電過(guò)程可以增加余熱鍋爐和蒸汽輪機。

The gasification power generation process mainly includes three aspects: firstly, biomass gasification, which converts solid biomass into gas fuel in a gasifier; The second is gas purification. The gasified gas contains certain impurities, including ash, coke, and tar, which need to be removed through a purification system to ensure the normal operation of gas power generation equipment; The third is gas power generation, which utilizes gas turbines or gas internal combustion engines for power generation. In some processes, in order to improve power generation efficiency, waste heat boilers and steam turbines can be added to the power generation process.

3、沼氣發(fā)電原理

3. Principles of biogas power generation

沼氣發(fā)電主要原理是利用工農業(yè)或城鎮生活中的大量有機廢棄物經(jīng)厭氧發(fā)酵處理產(chǎn)生的沼氣驅動(dòng)發(fā)電機組發(fā)電。用于沼氣發(fā)電的設備主要為內燃機，一般由柴油機組或者天然氣機組改造而成。

The main principle of biogas power generation is to use a large amount of organic waste in industry, agriculture, or urban life to drive the power generation unit with biogas generated through anaerobic fermentation treatment. The equipment used for biogas power generation is mainly internal combustion engines, which are generally modified from diesel or natural gas units.

沼氣發(fā)電系統用一個(gè)密閉型的熱動(dòng)力裝置(BTTPU)，包括一套沼氣發(fā)動(dòng)機、發(fā)電機和一臺帶出熱量的熱交換器。與現用的液體發(fā)酵主要區別在于物料有機質(zhì)不需要液化過(guò)程，在高溫厭氧環(huán)境下將生物質(zhì)原料直接裝入模塊式的密封發(fā)酵設備，在滲濾液環(huán)流作用下使干燥物料潮濕，經(jīng)過(guò)幾周時(shí)間，變成甲烷含量達70% ~ 80%的高質(zhì)量沼氣，通過(guò)沼氣發(fā)動(dòng)機轉換成電能以及余熱利用。

The biogas power generation system uses a closed thermal power unit (BTTPU), which includes a biogas engine, generator, and a heat exchanger with heat output. The main difference from current liquid fermentation is that the organic matter of the material does not require a liquefaction process. In a high-temperature anaerobic environment, the biomass raw material is directly loaded into a modular sealed fermentation equipment. Under the circulation of the leachate, the dry material is moist, and after a few weeks, it becomes high-quality biogas with a methane content of 70% to 80%. It is converted into electricity through a biogas engine and waste heat is utilized.

4、垃圾焚燒發(fā)電

4. Waste incineration power generation

垃圾焚燒發(fā)電包括垃圾焚燒發(fā)電和垃圾氣化發(fā)電，其不僅可以解決垃圾處理的問(wèn)題，同時(shí)還可以回收利用垃圾中的能量，節約資源，垃圾焚燒發(fā)電是利用垃圾在焚燒鍋爐中燃燒放出的熱量將水加熱獲得過(guò)熱蒸汽，推動(dòng)汽輪機帶動(dòng)發(fā)電機發(fā)電。垃圾焚燒技術(shù)主要有層狀燃燒技術(shù)、流化床燃燒技術(shù)、旋轉燃燒技術(shù)等。發(fā)展起來(lái)的氣化熔融焚燒技術(shù)，包括垃圾在450°~640°溫度下的氣化和含碳灰渣在1300℃以上的熔融燃燒兩個(gè)過(guò)程，垃圾處理徹底，過(guò)程潔凈，并可以回收部分資源，被認為是具有前景的垃圾發(fā)電技術(shù)。

Garbage incineration power generation includes garbage incineration power generation and garbage gasification power generation. It not only solves the problem of garbage treatment, but also recycles and utilizes the energy in garbage, saving resources. Garbage incineration power generation uses the heat released by garbage burning in the incineration boiler to heat water to obtain superheated steam, which drives the steam turbine to drive the generator to generate electricity. Waste incineration technology mainly includes layered combustion technology, fluidized bed combustion technology, rotary combustion technology, etc. The developed gasification and melting incineration technology includes two processes: gasification of waste at temperatures ranging from 450 ° to 640 ° C and melting combustion of carbon containing ash above 1300 ° C. The waste is thoroughly treated, the process is clean, and some resources can be recovered, making it the most promising waste power generation technology.

5、垃圾填埋氣發(fā)電

5. Landfill gas power generation

在垃圾填埋的過(guò)程中，因為填埋場(chǎng)垃圾堆放體內部缺少氧氣，垃圾中的有機物會(huì )發(fā)酵產(chǎn)生出大量的沼氣（填埋氣），平均每噸垃圾在填埋場(chǎng)壽命期內可產(chǎn)生約100—200立方米的填埋氣體，其主要成分是甲烷、二氧化碳、硫化氫、氮等氣體。

During the process of landfilling, due to the lack of oxygen inside the landfill, the organic matter in the waste will ferment and produce a large amount of biogas (landfill gas). On average, each ton of waste can produce about 100-200 cubic meters of landfill gas during the lifespan of the landfill, which is mainly composed of methane, carbon dioxide, hydrogen sulfide, nitrogen, and other gases.

垃圾填埋氣發(fā)電采用了完整地垃圾沼氣收集和利用理念，通過(guò)的垃圾沼氣收集系統，輸送系統，沼氣凈化系統和沼氣發(fā)電系統，將垃圾沼氣完全利用，產(chǎn)生電力，并入城市大電網(wǎng)之中，向電力用戶(hù)提供清潔能源。因此，現階段垃圾填埋氣發(fā)電是一種既能有效利用廢氣資源發(fā)電，又能減少空氣污染的無(wú)害化處理方式，是符合國家“節能減排”提倡的大方向目標的項目，是典型的“低碳經(jīng)濟”。

Landfill gas power generation adopts a complete concept of garbage and biogas collection and utilization. Through advanced garbage and biogas collection systems, transportation systems, biogas purification systems, and biogas power generation systems, garbage and biogas are fully utilized to generate electricity, which is integrated into the urban power grid and provides clean energy to electricity users. Therefore, at present, landfill gas power generation is a harmless treatment method that can effectively utilize waste gas resources for power generation while reducing air pollution. It is a project that conforms to the national goal of "energy conservation and emission reduction" and is a typical "low-carbon economy".