Production of hydrogen and liquid ammonia from coal-mine gas
Coal-mine gas is generated during coal mining, with the methane content of most coal mines being around 30 - 60 percent of the gas, which also consists partly of air. Two things justify the recovery of coal-mine gas: coal-mine safety and cutting methane emissions into the atmosphere. Recovered coal-mine gas can be used as energy or raw material for chemicals.
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Brief introduction

Coal-mine gas is generated during coal mining, with the methane content of most coal mines being around 30 - 60 percent of the gas, which also consists partly of air. Two things justify the recovery of coal-mine gas: coal-mine safety and cutting methane emissions into the atmosphere. Recovered coal-mine gas can be used as energy or raw material for chemicals.

By using the technology we developed for producing hydrogen and liquid ammonia out of coal mine gas, the deoxidation of coal-mine gas is not needed; water vapor and air or pure oxygen can be directly added depending on the methane concentration in the coal mine; autothermal reforming can be done on the CN-36 autothermal reforming catalyst to produce synthetic gas; and the generated synthetic gas can be used to produce hydrogen or synthesis ammonia.

Technical features

1.High-performance, heat-resistant catalyst for autothermal reforming of methane

The CN-36 catalyst for the autothermal reforming of methane has various advantages: heat resistance, a stable structure, and high conversion rate.

2.Advanced technology

This process makes full use of the fact that CBM contains oxygen or nitrogen and couples methane steam reforming and a catalytic oxidation reaction without needing an external heat supply. The flow is concise and energy utilization rate high.

Technical indicators (1000 Nm3 [H2]

Item

Unit

Consumption quota

Coal mine gas (methane: 30 percent)

Nm3

2895

Electricity

kWh

608

Desalinated water

t

0.7

The autothermal reforming catalyst is not sintered at 1,300℃. The methane conversion rate is ≥99 percent;

Service life: ≥2 years; Purity of product hydrogen: ≥99.99%;

The resulting liquid ammonia meets the national GB536-88 standard.

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