沼气中含有多中气体，其中H2S是一种具有恶臭的腐蚀性气体，如果不经过脱硫净化，对后续的管道、沼气柜、燃气燃烧设备等都具有很强的腐蚀性。而且H2S燃烧后产生SO2，其浓度罗高，这样的高浓度的SO2不仅会严重腐蚀燃烧设备，而且也会影响后期燃烧后的烟气排放标准备。因此必须对沼气进行脱硫净化。沼气脱硫采用干法脱硫，填料为氧化铁脱硫剂。氧化铁脱硫的主要机理是催化、氧化与吸附作用。当含有H2S的沼气通过氧化铁床层时， 在常压下发生放热反应，并在氧化铁表面上被催化氧化成硫离子，其生成物被氧化铁吸咐，以达到脱硫目的。

Biogas contains multiple gases, among which H2S is a corrosive gas with a foul odor. Without desulfurization and purification, it has strong corrosiveness on subsequent pipelines, biogas cabinets, gas combustion equipment, etc. Moreover, the combustion of H2S produces SO2, which has a high concentration. Such high concentrations of SO2 not only seriously corrode combustion equipment, but also affect the smoke emission standards after later combustion. Therefore, it is necessary to carry out desulfurization and purification of biogas. Dry desulfurization is adopted for biogas desulfurization, with iron oxide desulfurizer as the filler. The main mechanism of iron oxide desulfurization is catalysis, oxidation, and adsorption. When biogas containing H2S passes through the iron oxide bed, it undergoes an exothermic reaction at atmospheric pressure and is catalyzed to oxidize to sulfur ions on the surface of the iron oxide. The product is absorbed by the iron oxide to achieve desulfurization.

当运行一段时间后，若脱硫塔出口接近设计值，说明该塔填料已经饱和，失去脱硫能力， 需要更换。更换时,关闭进气阀，并用氮气吹扫脱硫塔直气体检测合格后，打开人孔及卸料孔，更换填料。脱硫塔进出口均设置气体取样嘴，以便化验取样。

After running for a period of time, if the outlet of the desulfurization tower approaches the design value, it indicates that the tower's packing has become saturated and lost its desulfurization capacity, requiring replacement. When replacing, close the intake valve and blow the desulfurization tower with nitrogen until the gas detection is qualified. Then, open the manhole and discharge hole and replace the packing. Gas sampling nozzles are installed at the inlet and outlet of the desulfurization tower for laboratory sampling.

1、氧化铁脱硫和再生反应过程

1. Iron oxide desulfurization and regeneration reaction process

脱硫过程

Desulfurization process

Fe2O3·H2O+3H2S==Fe2S3·H2O+3 H2O+5.2千卡

Fe2O3 · H2O+3H2S==Fe2S3 · H2O+3 H2O+5.2 kcal

再生过程

Regeneration process

2Fe2S3·H2O +3 O2==2Fe2O3·H2O +6S+94.2千卡

2Fe2S3 · H2O+3 O2=2Fe2O3 · H2O+6S+94.2 kcal

若气体中含O2，当O2/H2S＞2.5 时，脱硫再生反应可实现连续再生，则上述反应式合并为： Fe2O3·H2O

If the gas contains O2 and O2/H2S>2.5, the desulfurization regeneration reaction can achieve continuous regeneration, then the above reaction formulas are combined as Fe2O3 · H2O

2H2S+ O2========2H2O+2S

2H2S+O2

氧化铁脱硫剂再生是一个放热过程，如果再生过快，放热剧烈，脱硫剂容易起火燃烧，一定要控制好再生温度。

The regeneration of iron oxide desulfurizer is an exothermic process. If the regeneration is too fast and the heat release is severe, the desulfurizer is prone to ignition and combustion. It is necessary to control the regeneration temperature well.

2、技术优势

2. Technical advantages

（1）建设周期短，一次性投资资金少。

(1) Short construction period and low one-time investment funds.

（2）脱硫精度高。

(2) High desulfurization accuracy.

（3）占地面积小，节约空间。

(3) Small footprint, space saving.

（4）技术成熟，运行可靠性高。操作简单，故障率低。

(4) Mature technology and high operational reliability. Easy to operate and low failure rate.

（5）设备简单，日常维护费用低，节省人力。

(5) The equipment is simple, with low daily maintenance costs and saves manpower.

（6）脱硫剂的性高，系统所采用的脱硫剂对环境及人体无害，具有良好的环保效益。

(6) The safety of desulfurizers is high, and the desulfurizers used in the system are non-toxic and harmless to the environment and human body, with good environmental benefits.

3、工艺流程说明

3. Process Description

为满足用户需要，采用双塔并联运行，互为备用。

To meet user needs, double tower parallel operation is adopted as a backup for each other.

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