Methanol section: One question per day. Under what circumstances must a production unit be shut down urgently? 2016.03.29
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Methanol section: One question per day. Due to time constraints, we apologize for this; we will do our best to provide a question every day whenever possible! Under what circumstances does the unit undergo an emergency shutdown? Answer: The causes of some accidents are difficult to predict in advance, and in many cases immediate action is required. Here are a few examples: 1) When the unit speeds up and the emergency safety devices do not function. 2) When vibration occurs suddenly during normal operation, reducing the load immediately is ineffective, or when the vibration is severe. 3) Abnormal noises occur, especially when metal striking sounds appear along with vibrations. 4) When the bearing temperature rises suddenly, no interlock signal is generated despite the presence of an interlock system, and the oil discharge temperature reaches 85°C. 5) When the parameters at the turbine inlet drop sharply, be alert to water presence; this is indicated by white steam emerging from the shaft seal or by water hammer sounds. 6) Rapid drop in fuel tank level and rupture of fuel pipes, fire in the fuel system posing a threat to safe operation, and low oil pressure with no available solutions. 7) Steam pipeline rupture. 8) When sparks or smoke appear from the shaft seal. 9) Axial displacement increases sharply; load reduction is ineffective or not implemented in time. 10) When compressor surge cannot be eliminated. 11) In case of power outages, CW water interruptions, steam interruptions, etc. 12) When the safety valve fails to return to its normal position after activating. 13) When the level of the seal oil sump cannot be controlled. 14) When the vacuum drops to the specified value. 15) When there is an interlock signal output but the unit does not stop automatically.
There may be a large-scale leakage of syngas, or explosions and fires may occur. The synthetic internal process interlock (LSLL2002) and the external process interlock caused the C20001 trip. There are situations such as power outages, loss of instrument air, and water shortages (boiler feed water, circulating water). The synthesis system shuts down urgently when the temperature in the synthesis tower gets out of control and exceeds the specified limit by 10°C, or when the total sulfur content in the purified gas exceeds 0.1 ppm.
①A serious malfunction occurred in the unit: the motor was smoking, on fire, and producing abnormal noises. ②No water supply, no power supply, no oil supply, and the oil pump is malfunctioning. ③Equipment pipelines experience severe leaks of liquid and gas, fires, explosions, and more...
An emergency stop refers to an emergency occurring while the unit is operating normally. A means of performing an emergency shutdown to avoid danger and losses.
The causes of some accidents are difficult to predict in advance, and in many cases immediate action is required; here are a few examples. When the unit is overspeeding and the emergency shutdown device does not activate. When vibration occurs suddenly during normal operation, when reducing the load immediately is ineffective, or when the vibration is severe. There are abnormal noises, especially when metal striking sounds occur along with vibrations. When the bearing temperature rises suddenly, there is no output from the interlock signal associated with it, and the oil discharge temperature is very high. When the parameters at the turbine inlet drop sharply, be vigilant against water ingress, especially when white steam appears at the shaft seal or water hammer sounds are heard. The fuel level in the tank drops rapidly and the fuel lines burst; the fuel system catches fire, posing a threat to safe operation, and there are no measures available when the oil pressure is too low. The steam pipeline has ruptured. When sparks or smoke appear from the shaft seal. Axial displacement increases sharply; load reduction is ineffective or not implemented in time. When compressor surge cannot be eliminated. In the event of power outages, water outages, steam outages, etc. When the safety valve trips and cannot be reset. When the high-level oil tank for seal oil cannot be controlled (GB601, GC602). When the vacuum drops to the specified value. When there is an interlock signal output but the unit does not stop automatically.
The causes of some accidents are difficult to predict in advance, and in many cases immediate action is required. Here are a few examples: 1) When the unit runs at an excessive speed and the emergency shutdown device does not function. 2) When vibration occurs suddenly during normal operation, reducing the load immediately is ineffective, or when the vibration is severe. 3) Abnormal noises occur, especially when metal striking sounds appear along with vibrations. 4) When the bearing temperature rises suddenly, no interlock signal is generated despite the presence of an interlock system, and the oil discharge temperature reaches 85°C. 5) When the parameters at the turbine inlet drop sharply, be alert to water presence; this is indicated by white steam emerging from the shaft seal or by water hammer sounds. 6) Rapid drop in fuel tank level and rupture of fuel pipes, fire in the fuel system posing a threat to safe operation, and low oil pressure with no available solutions. 7) Steam pipeline rupture. 8) When sparks or smoke appear from the shaft seal. 9) Axial displacement increases sharply; load reduction is ineffective or not implemented in time. 10) When compressor surge cannot be eliminated. 11) In the event of power outages, CW water interruptions, steam interruptions, etc. 12) When the safety valve fails to return to its normal position after activating. 13) When the level of the seal oil sump cannot be controlled. 14) When the vacuum drops to the specified value. 15) When there is an interlock signal output but the unit does not stop automatically.
Low main steam temperature and pressure can lead to an expansion of the combustible gas leaks or even ignition, resulting in the shutdown of other units
The unit experiences severe vibration or grinding noises inside the casing, smoking or firing occurs, the oil level in the tank drops rapidly, and even after adding oil the level does not rise; any one of the unit’s interlock systems fails, etc.
1) When the unit is overspeeding and the emergency shutdown device does not activate. 2) When vibration occurs suddenly during normal operation, reducing the load immediately is ineffective, or when the vibration is severe. 3) Abnormal noises occur, especially when metal striking sounds appear along with vibrations. 4) When the bearing temperature rises suddenly, no interlock signal is generated despite the presence of an interlock system, and the oil discharge temperature reaches 85°C. 5) When the parameters at the turbine inlet drop sharply, be alert to water presence; this is indicated by white steam emerging from the shaft seal or by water hammer sounds. 6) Rapid drop in fuel tank level and rupture of fuel pipes, fire in the fuel system posing a threat to safe operation, and low oil pressure with no available solutions. 7) Steam pipeline rupture. 8) When sparks or smoke appear from the shaft seal. 9) Axial displacement increases sharply; load reduction is ineffective or not implemented in time. 10) When compressor surge cannot be eliminated. 11) In the event of power outages, CW water interruptions, steam interruptions, etc. 12) When the safety valve fails to return to its normal position after activating. 13) When the level of the seal oil sump cannot be controlled. 14) When the vacuum drops to the specified value. 15) When there is an interlock signal output but the unit does not stop automatically.
1) When the unit is overspeeding and the emergency shutdown device does not activate. 2) When vibration occurs suddenly during normal operation, reducing the load immediately is ineffective, or when the vibration is severe. 3) Abnormal noises occur, especially when metal striking sounds appear along with vibrations. 4) When the temperature rises suddenly, no interlock signal is generated despite the interlock mechanism being in place, and the oil discharge temperature reaches 85°C. 5) When the parameters at the turbine inlet drop sharply, be alert to water presence; this is indicated by white steam emerging from the shaft seal or by water hammer sounds. 6) Rapid drop in fuel tank level and rupture of fuel pipes, fire in the fuel system posing a threat to safe operation, and low oil pressure with no available solutions. 7) Steam pipeline rupture. 8) When sparks or smoke appear from the shaft seal. 9) Axial displacement increases sharply; load reduction is ineffective or inconsistent. 10) When compressor surge cannot be eliminated. 11) In case of power outages, CW water interruptions, steam interruptions, etc. 12) When the safety valve fails to return to its normal position after activating. 13) When the level of the seal oil sump cannot be controlled. 14) When the vacuum drops to the specified value. 15) When there is an interlock signal output but the unit does not stop automatically.