Ammonia decomposition equipment
1﹑Introduction to Ammonia decomposition
Ammonia decomposition is a chemical reaction process in which ammonia (NH₃) is decomposed into hydrogen (H₂) and nitrogen (N₂). This reaction typically requires high temperatures and often requires a catalyst to facilitate the reaction.
The chemical equation for ammonia decomposition is: 2NH₃ → 3H₂ + N₂, this reaction absorbs a large amount of heat; under standard conditions, approximately 11040 kcal of energy is absorbed per mole of ammonia decomposed.
In industrial applications, ammonia decomposition is commonly used to prepare hydrogen-nitrogen mixed gas. The process involves vaporizing liquid ammonia and then heating it to a certain temperature, where it decomposes under the action of a catalyst. This technology is widely used in gas protection stations and other applications to provide the required hydrogen-nitrogen mixed gas.
2﹑Features of Ammonia Decomposition Equipment:
1. Low investment cost: Low equipment investment, mature technology, simple process, and low price.
2. High efficiency and energy saving: Liquid ammonia raw material is inexpensive, energy consumption is low, efficiency is high, and operating costs are low.
3. High economic efficiency: It is the most economical source of nitrogen-hydrogen mixed protective atmosphere and pure hydrogen extraction.
4. Reliable performance: Long equipment service life, using high-quality catalysts and heat-resistant stainless steel inner liner.
5. Convenient operation: Features patented automatic temperature control technology, ensuring continuous and stable gas flow.
6. Integrated design: Integrated process piping and valves, using multi-channel programmable valves for more reliable operation.
7. Adsorption tower design: Uses a jacketed adsorption tower, solving the adsorption heat balance problem and improving hydrogen recovery rate.
8. Good adjustability: Can be adjusted freely within the rated gas production range to meet different gas requirements.
9. Wide application: Suitable for bright annealing protective gas for various materials in ferrous and non-ferrous metals, machinery industries, and reducing gas in the chemical industry.
The ammonia decomposition equipment features a unique structural design and high-quality component selection. Firstly, the adsorption tower adopts an inner and outer cylinder structure, which effectively avoids the overheating and sintering of molecular sieves, thus significantly extending the service life of the molecular sieves. Secondly, the equipment uses high-quality valves with high sealing performance, effectively preventing internal leakage and ensuring the high purity of the final product gas.
3﹑Operating Procedures
1. Pre-startup preparation: Connect the power supply and raise the temperature to 750°C-800°C to reach the operating temperature. The temperature is controlled by an automatic control system.
2. Ammonia purging and venting: First, open the vent valve, then slowly open the ammonia inlet valve to allow liquid ammonia to vaporize inside the equipment and enter the decomposition furnace through the heat exchanger. The decomposed gas needs to be vented for about half an hour.
3. Normal gas supply: After venting for half an hour, close the vent valve and simultaneously open the decomposed gas valve to supply qualified decomposed gas to the purification unit. Open the purification unit valve, adjust the flow rate and pressure, and supply gas to the point of use. The decomposition furnace enters a stable operating state.
4. Shutdown procedure: Cut off the power supply, first close the ammonia inlet valve, then close the decomposed gas valve, and open the vent valve. If the equipment is shut down for a long time or requires maintenance, nitrogen purging should be performed to ensure that the residual hydrogen content in the system does not exceed 0.5%, to ensure equipment safety and prevent fire or explosion.
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