Ammonia Cracker Common Failures & Daily Maintenance Steps

Ammonia cracker is the core supporting equipment of protective atmosphere furnaces, responsible for decomposing liquid ammonia into hydrogen-nitrogen mixed protective gas, which is widely used in stainless steel annealing and powder metallurgy sintering production. The stable operation of the ammonia cracker directly determines the purity and stability of the furnace protective atmosphere.

Ammonia cracker failures such as insufficient decomposition rate, unstable gas output and equipment shutdown will directly cause workpiece oxidation, discoloration and unqualified performance. Regular standardized maintenance can effectively reduce failure rates and ensure long-term stable gas supply. This article sorts out common failures and complete daily maintenance steps of ammonia crackers.

6 Common Ammonia Cracker Failures & Solutions

1. Insufficient Ammonia Decomposition Rate

Causes: Low cracking temperature, aging catalyst, excessive ammonia inlet flow. Incomplete ammonia decomposition leads to unqualified atmosphere purity and residual ammonia gas in the furnace.

Solutions: Adjust cracking temperature to standard range; replace failed catalyst regularly; control stable ammonia inlet flow to ensure full decomposition reaction.

2. Unstable Gas Output Pressure

Causes: Blocked gas pipeline, unstable liquid ammonia supply, pressure regulator failure. Fluctuating gas pressure leads to unstable furnace atmosphere concentration.

Solutions: Clean pipeline blockages regularly; check liquid ammonia supply stability; calibrate and replace faulty pressure regulating equipment to stabilize output pressure.

3. Catalyst Aging & Failure

Causes: Long-term high-temperature use, impurity pollution, over-load operation lead to catalyst activity attenuation and reduced cracking efficiency.

Solutions: Replace catalyst according to service cycle; clean equipment internal impurities regularly; avoid long-term over-load operation to prolong catalyst service life.

4. Equipment Over-Temperature & Alarm

Causes: Blocked heat dissipation system, inaccurate temperature detection, unreasonable temperature parameter setting.

Solutions: Clean heat dissipation components regularly; calibrate temperature sensors; reset standard temperature parameters to avoid over-temperature operation risks.

5. Pipeline Leakage & Gas Loss

Causes: Aging pipeline joints, loose connections, corrosion damage lead to ammonia gas leakage, affecting atmosphere stability and production safety.

Solutions: Conduct regular pipeline air tightness detection; tighten loose joints; replace aging and corroded pipelines timely.

6. Frequent Startup & Shutdown Jitter

Causes: Unstable power supply, faulty control system, abnormal gas circuit signal.

Solutions: Stabilize equipment power supply; inspect and repair control system faults; calibrate gas circuit sensing signals to ensure stable equipment operation.

Complete Daily & Regular Maintenance Steps

Daily Inspection Items

Check liquid ammonia supply pressure and gas output pressure stability every day; observe equipment operating temperature and alarm status; check pipeline leakage and gas circuit smoothness; record daily operating data for trend analysis.

Weekly Maintenance Items

Clean equipment surface and pipeline dust impurities; inspect and calibrate pressure regulating valves and temperature control systems; check catalyst working status and gas decomposition effect; drain residual moisture and impurities in the system.

Monthly Maintenance Items

Comprehensively detect pipeline air tightness; inspect electrical circuit and control system stability; evaluate catalyst activity and replace aging parts in advance; calibrate all detection sensors and operating parameters.

Annual Overhaul Items

Completely clean the internal reaction system; replace aging catalyst and vulnerable parts; conduct full equipment performance testing and parameter debugging to restore optimal working state.

Conclusion

Stable operation of ammonia cracker is the key to ensure high-quality furnace heat treatment production. Timely troubleshooting and standardized daily maintenance can effectively reduce equipment failure rates, stabilize protective atmosphere purity, avoid workpiece quality defects caused by abnormal atmosphere, and provide reliable equipment guarantee for long-term stable production.