生物+同步再生干法脫硫，破解污泥沼氣高硫難題，去除率99%+

　　Biological+synchronous regeneration dry desulfurization solves the problem of high sulfur in sludge and biogas, with a removal rate of 99%+

　　厭氧消化是我國污泥處理處置的核心技術(shù)路線，在污泥降解過程中會(huì)伴隨產(chǎn)生大量沼氣，其甲烷含量達(dá)60%～70%，是出彩具價(jià)值的可再生能源。但污泥沼氣中含有的硫化氫（H?S）成為其資源化利用的“明顯阻礙”——H?S劇毒，空氣中濃度達(dá)0.1%時(shí)可致人瞬間昏迷、腦死亡，且在潮濕環(huán)境下會(huì)強(qiáng)烈腐蝕管道和燃燒設(shè)備，燃燒后產(chǎn)生的SO?還會(huì)造成大氣污染。我國污泥厭氧消化沼氣中H?S含量多在300～9000mg/m?，個(gè)別案例高達(dá)30000mg/m?，優(yōu)于《大中型沼氣工程技術(shù)規(guī)范》規(guī)定的發(fā)電用H?S≤200mg/m?、民用供氣≤20mg/m?的標(biāo)準(zhǔn)，脫硫處理成為沼氣資源化利用的必由之路。

　　Anaerobic digestion is the core technology route for sludge treatment and disposal in China. During the sludge degradation process, a large amount of biogas is generated, with a methane content of 60% to 70%, which is a highly valuable renewable energy source. But the hydrogen sulfide (H2S) contained in sludge biogas has become a "fatal obstacle" to its resource utilization - H2S is highly toxic, and when the concentration in the air reaches 0.1%, it can cause instant coma and brain death. In humid environments, it can strongly corrode pipelines and combustion equipment, and the SO? Produced after combustion can also cause air pollution. The H-S content in anaerobic digestion biogas of sludge in China is mostly between 300-9000mg/m? Some cases reach up to 30000mg/m? , far exceeding the requirement of H-S ≤ 200mg/m for power generation specified in the Technical Specification for Large and Medium sized Biogas Engineering? Civil gas supply ≤ 20mg/m? According to the standard, desulfurization treatment has become a necessary path for the resource utilization of biogas.

　　傳統(tǒng)沼氣脫硫工藝存在諸多短板：干法脫硫硫容有限、再生風(fēng)險(xiǎn)高，不適用于大型污泥消化項(xiàng)目；濕法脫硫堿耗高（3～5kgNaOH/kgH?S）、易產(chǎn)生二次污染，難以達(dá)到排放標(biāo)準(zhǔn)。在此背景下，“生物+同步再生干法脫硫法”應(yīng)運(yùn)而生，結(jié)合生物脫硫與改良型干法脫硫的優(yōu)勢，成為大型市政污泥消化沼氣脫硫的理想方案，既解決高硫濃度處理難題，又實(shí)現(xiàn)降本增效。

　　The traditional biogas desulfurization process has many shortcomings: dry desulfurization has limited sulfur capacity, high regeneration risk, and is not suitable for large-scale sludge digestion projects; Wet flue gas desulfurization has high alkali consumption (3-5 kg NaOH/kgH? S) and is prone to secondary pollution, making it difficult to meet emission standards. In this context, the "biological+synchronous regeneration dry desulfurization method" has emerged, integrating the advantages of biological desulfurization and improved dry desulfurization, becoming an ideal solution for large-scale municipal sludge digestion and biogas desulfurization. It not only solves the problem of high sulfur concentration treatment, but also achieves cost reduction and efficiency improvement.

　　該工藝以堿再生生物洗滌為核心一級脫硫，依托脫氮硫桿菌等化能自養(yǎng)型脫硫菌，將沼氣中的H?S轉(zhuǎn)化為單質(zhì)硫，實(shí)現(xiàn)脫除與堿液再生。其核心優(yōu)勢在于環(huán)保經(jīng)濟(jì)，無需額外添加催化劑，堿耗僅0.63kgNaOH/kgH?S，遠(yuǎn)低于傳統(tǒng)濕法脫硫，且可回收純度95%以上的單質(zhì)硫，實(shí)現(xiàn)資源循環(huán)。華東某大型污泥厭氧消化項(xiàng)目中，生物脫硫單元在進(jìn)氣H?S濃度4125～7425mg/m?的情況下，去除率穩(wěn)定在99%以上，出氣濃度平均僅11.72mg/m?，耐沖擊負(fù)荷能力突出。

　　This process takes alkaline regeneration biological washing as the core for primary desulfurization, relying on autotrophic desulfurization bacteria such as denitrifying sulfur bacteria to convert H2S in biogas into elemental sulfur, achieving efficient removal and alkaline regeneration. Its core advantage lies in environmental protection and economy, without the need for additional catalysts, with a base consumption of only 0.63kgNaOH/kgH? S， Far lower than traditional wet desulfurization, and capable of recovering elemental sulfur with a purity of over 95%, achieving resource recycling. In a large-scale anaerobic digestion project for sludge in East China, the biological desulfurization unit has an inlet H2S concentration of 4125-7425mg/m? In this case, the removal rate remains stable at over 99%, and the average gas concentration is only 11.72mg/m? Outstanding ability to withstand impact loads.

　　同步再生干法脫硫作為二級精脫硫，巧妙解決了傳統(tǒng)干法脫硫再生難、易自燃、脫硫劑板結(jié)的痛點(diǎn)。該工藝通過自控系統(tǒng)，根據(jù)沼氣流量和H?S濃度自動(dòng)變頻投加空氣（富余系數(shù)1.2～1.8），在脫除H?S的同時(shí)完成脫硫劑連續(xù)再生，采用隔離倉卸料設(shè)計(jì)杜絕空氣帶入引發(fā)自燃，搭配加熱保溫裝置防止脫硫劑板結(jié)。工程實(shí)踐表明，該單元可將生物脫硫后的沼氣H?S濃度進(jìn)一步降至1mg/m?以下，即便生物脫硫故障，進(jìn)氣濃度達(dá)300～500mg/m?，仍能保證出氣≤20mg/m?，起到應(yīng)急保障作用。

　　Synchronous regeneration dry desulfurization, as a secondary precision desulfurization, perfectly solves the pain points of difficult regeneration, easy self ignition, and desulfurizer agglomeration in traditional dry desulfurization. This process uses a self-control system to automatically add air (with a surplus factor of 1.2-1.8) according to the biogas flow rate and H2S concentration through frequency conversion. While removing H2S, it completes continuous regeneration of desulfurizer. It adopts an isolated bin discharge design to prevent air from entering and causing spontaneous combustion, and is equipped with a heating and insulation device to prevent desulfurizer from solidifying. Engineering practice has shown that this unit can further reduce the H2S concentration of biogas after biological desulfurization to 1mg/m? Even if biological desulfurization fails, can the intake concentration reach 300-500mg/m? Can we still ensure that the gas output is ≤ 20mg/m? Plays an emergency support role.

　　“生物+同步再生干法脫硫法”實(shí)現(xiàn)了優(yōu)勢互補(bǔ)：生物脫硫處理量大、運(yùn)行成本低，同步再生干法脫硫反應(yīng)快、凈化度高，二者結(jié)合既適配大型污泥消化項(xiàng)目的高氣量、高硫濃度需求，又能滿足嚴(yán)格的環(huán)保標(biāo)準(zhǔn)。上述華東案例中，該脫硫系統(tǒng)處理成本僅0.101元/m?沼氣，直接運(yùn)行成本低至0.039元/m?，設(shè)備總投資約700萬元，占地面積600㎡，脫硫劑日消耗量僅1～2kg，更換周期長達(dá)數(shù)年，經(jīng)濟(jì)效益顯著。

　　The "biological+synchronous regeneration dry desulfurization method" has achieved complementary advantages: biological desulfurization has a large processing capacity and low operating costs, while synchronous regeneration dry desulfurization has fast reaction and high purification degree. The combination of the two is suitable for the high gas volume and high sulfur concentration requirements of large-scale sludge digestion projects, and can also meet strict environmental standards. In the above-mentioned East China case, the desulfurization system has a processing cost of only 0.101 yuan/m ? of biogas, with a direct operating cost as low as 0.039 yuan/m ?. The total equipment investment is about 7 million yuan, covering an area of 600 square meters. The daily consumption of desulfurizer is only 1-2 kg, and the replacement cycle takes several years, resulting in significant economic benefits.

　　隨著污泥厭氧消化項(xiàng)目規(guī)?；七M(jìn)，沼氣資源化利用需求日益迫切，傳統(tǒng)脫硫工藝已難以適配行業(yè)發(fā)展。生物+同步再生干法脫硫法憑借、經(jīng)濟(jì)、安全、環(huán)保的優(yōu)勢，破解了污泥沼氣高硫處理瓶頸，既保障了沼氣回收利用的安全性，又降低了運(yùn)行成本，還實(shí)現(xiàn)了單質(zhì)硫資源化回收，為大型市政污泥消化沼氣脫硫提供了可復(fù)制、可推廣的解決方案，助力沼氣產(chǎn)業(yè)高質(zhì)量發(fā)展與“雙碳”目標(biāo)落地。

　　With the large-scale promotion of sludge anaerobic digestion projects, the demand for biogas resource utilization is becoming increasingly urgent, and traditional desulfurization processes are no longer suitable for industry development. The biological+synchronous regeneration dry desulfurization method, with its advantages of high efficiency, economy, safety, and environmental protection, has solved the bottleneck of high sulfur treatment of sludge and biogas, ensuring the safety of biogas recycling and utilization, reducing operating costs, and realizing the resource recovery of elemental sulfur. It provides a replicable and promotable solution for large-scale municipal sludge digestion and biogas desulfurization, and helps the high-quality development of the biogas industry and the implementation of the "dual carbon" goal.

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