The impact of solid particles such as dust on gas internal combustion generator sets mainly lies in causing filter blockage, insufficient air intake, and pressure reduction. Inside the engine cylinder, it can cause wear on the cylinder wall and piston, as well as contaminate the lubricating oil, resulting in wear on other components such as sliding bearings and affecting the normal operation of the unit. The built-in filter of the engine gas intake valve group is only used to protect the system from particle damage and cannot be used as a workload filter. Users should install a workload filter in the gas pipeline, and the filter should be installed when the particle diameter is greater than 3 μ At m, the separation rate must reach 99.99% or above.

對于助燃空氣，顏巴赫燃?xì)獍l(fā)電機組要求空氣中顆粒物含量不高于0.1 mg/Nm3，助燃空氣過濾器至少滿足EN779 G3等級，且必須確保各類工藝的排放氣體（如工業(yè)廢氣、生物過程排放尾氣或溶劑）不能進入到發(fā)動機助燃空氣中，以免影響發(fā)動機的運行。

For combustion air, Yanbach gas generator sets require that the particulate matter content in the air should not exceed 0.1 mg/Nm3, and the combustion air filter should at least meet the EN779 G3 level. It is necessary to ensure that the exhaust gases from various processes (such as industrial waste gas, biological process exhaust gas, or solvents) cannot enter the engine combustion air to avoid affecting engine operation.

硫

sulfur

在生物沼氣等燃?xì)庵谐３：辛蚧瘹涞群蚧衔?，如果在氣缸?nèi)燃燒則形成二氧化硫和三氧化硫。由于燃?xì)庵泻兴智胰細(xì)馊紵矊a(chǎn)生水分，含硫化合物溶于水形成氫硫酸、亞硫酸和硫酸，這些酸性物質(zhì)會對發(fā)動機金屬部件產(chǎn)生腐蝕。含硫化合物溶于機油中也會使機油酸化，降低機油的潤滑能力，縮短機油使用壽命，并且對發(fā)動機內(nèi)需要通過機油進行潤滑的部件產(chǎn)生腐蝕性影響，例如軸瓦、凸輪搖臂機構(gòu)等。此外，含硫化合物也會對火花塞的金屬電極產(chǎn)生腐蝕，縮短火花塞使用壽命。

Gases such as biogas often contain sulfur containing compounds such as hydrogen sulfide. If burned in the cylinder, sulfur dioxide and sulfur trioxide are formed. Due to the presence of moisture in gas and the generation of moisture during combustion, sulfur-containing compounds dissolve in water to form hydrosulfuric acid, sulfite, and sulfuric acid, which can corrode engine metal components. Sulfur-containing compounds dissolved in engine oil can also acidify the oil, reduce its lubrication ability, shorten its service life, and have corrosive effects on components that need to be lubricated through oil in the engine, such as bearing shells, cam rocker mechanisms, etc. In addition, sulfur compounds can also corrode the metal electrodes of spark plugs, shortening their service life.

燃?xì)鈨?nèi)燃發(fā)電機組對于燃?xì)夂蛄康木唧w要求跟機組型號以及燃?xì)饧淄闈舛鹊榷加嘘P(guān)系，一般來說進入發(fā)動機的燃?xì)庵泻蚩偭繎?yīng)低于300 mg/Nm3。此外，帶預(yù)燃室的機型通常有額外的要求。如果有帶催化劑的尾氣處理設(shè)備，還需考慮催化劑對硫含量的要求。

The specific requirements for gas sulfur content in gas internal combustion generator sets are related to the unit model and gas methane concentration. Generally, the total sulfur content in the gas entering the engine should be less than 300 mg/Nm3. In addition, models with pre combustion chambers typically have additional requirements. If there is a tail gas treatment equipment with a catalyst, it is also necessary to consider the catalyst's requirements for sulfur content.

在熱電聯(lián)供系統(tǒng)中，發(fā)動機尾氣常通過煙氣熱水換熱器進行熱交換以回收尾氣余熱。如果煙氣溫度降到硫氧化物（SOx）的酸露點以下，則會對換熱器產(chǎn)生腐蝕。圖1為硫氧化物的濃度與酸露點的曲線。

In a cogeneration system, engine exhaust is often heat exchanged through a flue gas hot water heat exchanger to recover exhaust heat. If the flue gas temperature drops below the acid dew point of sulfur oxides (SOx), it will cause corrosion to the heat exchanger. Figure 1 shows the curve between the concentration of sulfur oxides and the acid dew point.

揮發(fā)性有機硅化合物（VOSC）

Volatile Organic Silicon Compounds (VOSC)

在生物沼氣、垃圾填埋氣中常常出現(xiàn)有機硅化合物，并且以硅氧烷分解物的形式存在，其特性是可燃、易揮發(fā)。這種物質(zhì)在發(fā)動機中燃燒后會產(chǎn)生氧化硅，久而久之會形成沉積物覆蓋在發(fā)動機氣缸蓋表面，這會增加發(fā)動機的維護工作。如果發(fā)電系統(tǒng)配置了催化氧化劑尾氣處理裝置，此類雜質(zhì)還會使催化劑失效。

Organic silicon compounds often appear in biogas and landfill gas, and exist in the form of siloxane decomposition products, which are flammable and volatile. After combustion in the engine, this substance will produce silicon oxide, which over time will form sediment covering the surface of the engine cylinder head, which will increase the maintenance work of the engine. If the power generation system is equipped with a catalytic oxidant tail gas treatment device, such impurities can also cause catalyst failure.

由于揮發(fā)性可氧化硅化合物的波動性，分析其在燃?xì)庵械暮枯^為困難。因此，我們可以對機油進行分析，根據(jù)發(fā)電機組制造商所提供的檢測要求和計算公式，通過在一定運行小時內(nèi)進行兩次機油檢測，對機油中硅總量進行分析計算特征值，以確定是否滿足機組正常運行的要求。

Due to the volatility of volatile oxidizable silicon compounds, it is difficult to analyze their content in gas. Therefore, we can analyze the oil and, based on the testing requirements and calculation formulas provided by the generator set manufacturer, conduct two oil tests within a certain operating hour to analyze and calculate the characteristic values of the total silicon content in the oil, in order to determine whether it meets the requirements for normal operation of the unit.

焦油

Tar

在冷卻至低于露點的情況下，如果在燃?xì)饣蛘呋旌蠚庵形龀龉虘B(tài)、液態(tài)或者高黏度產(chǎn)物形式的碳?xì)浠衔铮瑒t將這類冷凝或者升華產(chǎn)物稱為焦油。由于不同的運行溫度和熱化學(xué)反應(yīng)過程，生物質(zhì)熱解和氣化過程中會產(chǎn)生成百上千種不同類別的焦油。通常，此類碳?xì)浠衔镌诘蜏赜隼鋾r凝結(jié)成液態(tài)，會堵塞進氣系統(tǒng)、渦輪增壓器葉片和中冷器等。

If hydrocarbons in the form of solid, liquid, or high viscosity products are precipitated in the gas or mixture when cooled to below the dew point, such condensation or sublimation products are called tar. Due to different operating temperatures and thermochemical reaction processes, hundreds or thousands of different types of tar are produced during biomass pyrolysis and gasification. Usually, such hydrocarbons condense into liquid when they are cooled at low temperature, which will block the intake system, turbocharger blades, intercooler, etc.

很難用簡單的冷凝方法完全去除焦油，因此對于含有焦油的燃?xì)?，需要在燃?xì)膺M氣閥組管路上安裝加熱裝置，同時避免溫度較低的助燃空氣與含有此類碳?xì)浠衔锏娜細(xì)饣旌?。對生物質(zhì)熱解氣進行預(yù)處理后，對其中焦油的露點進行分析是一個行之有效的方法。燃?xì)庵薪褂吐饵c一般應(yīng)低于燃?xì)饴饵c5°C以上，這樣才能避免焦油進入燃?xì)饨佑|的部件內(nèi)。以顏巴赫燃?xì)獍l(fā)電機組為例，機組對燃?xì)膺M氣溫度的范圍要求是10 - 40°C。

It is difficult to completely remove tar using a simple condensation method. Therefore, for gas containing tar, it is necessary to install a heating device on the gas inlet valve group pipeline, while avoiding the mixing of low-temperature combustion air with gas containing such hydrocarbons. Analyzing the dew point of tar in biomass pyrolysis gas after pre-treatment is an effective method. The dew point of tar in gas should generally be 5 ° C or above lower than the dew point of gas, in order to prevent tar from entering components in contact with gas. Taking Yanbach gas generator unit as an example, the range of gas inlet temperature required by the unit is 10-40 ° C.

通過上述分析可以發(fā)現(xiàn)，燃?xì)庵袔追N常見雜質(zhì)將影響燃?xì)鈨?nèi)燃發(fā)電機組的正常運行。如果使用雜質(zhì)超標(biāo)的燃?xì)猓承┣闆r下發(fā)電機組也許不會立即發(fā)生運行指標(biāo)衰減、故障停機等顯性問題。但這類雜質(zhì)對發(fā)電機組帶來的危害將逐漸累積，并對機組的運行效果，正常維護間隙甚至使用壽命產(chǎn)生非常深遠(yuǎn)的負(fù)面影響。

Through the above analysis, it can be found that several common impurities in gas will affect the normal operation of gas internal combustion power generation units. If gas with excessive impurities is used, in some cases, the generator unit may not immediately experience obvious problems such as operational indicator attenuation and fault shutdown. However, the harm caused by such impurities to the power generation unit will gradually accumulate, and have a very profound negative impact on the operation effect, normal maintenance clearance, and even service life of the unit.

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