Shut-down procedures for gasifiers and gasification units
Thread Content
If the process in the gasification furnace is abnormal, resulting in some parameters exceeding their limits or failures in the process and instrumentation equipment, the safety interlock emergency shutdown system will be activated, causing the gasification furnace or even the entire gasification plant to shut down automatically according to a predetermined procedure. The operator can also manually activate the safety interlock system to shut down the machine. The factors that trigger shutdown are as follows: 1) The oxygen flow rate takes longer than xx seconds to reach the required level, resulting in ignition failure; 2) Low slurry flow rate; 3) Low speed of the slurry feed pump; 4) Low oxygen flow rate; 5) High temperature at the outlet of the crude syngas from the gasifier; 6) Low liquid level in the quench chamber; 7) Low or high pressure difference in the gasifier; 8) Low or high pressure difference in the process burners; 9) High valve position of the slurry circulation valve; 10) Low valve position of the slurry shut-off valve; 11) Low valve position of the oxygen shut-off valve; 12) High valve position of the oxygen vent valve; 13) Low liquid level in the carbon Washing tower; 14) Interlock due to a fault in the cooling water system of the process burners; 15) Shutdown of the slurry pump.
This is just part of the interlock protection; it’s not some kind of shutdown procedure.
It only mentioned the factors that trigger parking (the source of the parking signal). It is estimated to be just a small section within the “shutdown procedures for gasifiers and gasification units”. The original poster really knows how to joke – treating us sea friends like preschool children.
Statistics on the emergency shutdown interlocks or switch functions of each unit: Unit 11, Unit 12, Unit 13, Unit 14, Unit 15. Interlock tag number, Interlock name, Interlock tag number, Interlock name, Interlock tag number, Interlock name, Interlock tag number, Interlock name, Interlock tag number, Interlock name. 11KS0001, 12US0101: High level in V1201A. 13UZ0001: Emergency shutdown of gasifier. 14UZ0004: Main shutdown. 13UZ-0001: Protection for HPHT pipe sections. 12UZ0102: Low level in V1205. 13UZ0002: Emergency shutdown of CB oxygen system. 14US0004: Main shutdown. 15US-0002A: High pressure in V1504A. 12US0103: Low speed in X1205. 13UZ0003: Emergency shutdown of SB oxygen system. 14US0003: Protection for P1403. 15US-0002B: High pressure in V1504B. 12US0104: Low speed in X1206. 13UZ0004: Emergency shutdown of slag pool. 14US0005: Protection for X1402. 15US-0003: Prevention of flare backflow. 12US0105: Switch fails to operate. 13UZ0005: Emergency shutdown of SB system. 14US0012: Protection against low pH levels in SSS. 15US-0004: Prevention of flare backflow. 12US0106: Switch fails to operate. 13UZ0006: Emergency shutdown of IB system. 14US0007: Valve interlock. 15US-0015A: Prevention of flare backflow. 12US0107: Protection for S1201. 13UZ0010: Purging and detection. 14US0008: Valve interlock. 15US-0015B: Prevention of flare backflow. 12US0108: Protection for S1201. 13UZ0011-14: Emergency shutdown of CB system. 14US0009: Prevention of reverse flash during venting. 15US-0005: Valve interlock. 12US0201: High level in V1201B. 13US0021-24: Emergency shutdown of CB steam system. 14US0010: Overpressure protection. 15US-0006: Valve interlock. 12UZ0202: Low level in V1205. 13US-0007: Shutdown of K1301. 15US-0007A: Valve interlock. 12US0203: Low speed in X1205. 13US-0008: Low liquid level in V1307. 15US-0007B: Valve interlock. 12US0204: Low speed in X1206. 13US-0009: High liquid level in V1307. 15US-0008: Valve interlock. 12US0205: Switch fails to operate. 13US-0019: Nitrogen purging for cleaning purposes. 15US-0009A: Valve interlock. 12US0206: Switch fails to operate. 13US-0020: Nitrogen protection for V1307. 13US0029: High temperature in tempering water. 15US-0009B: Valve interlock. 12US0207: Protection for S1201. 13US-0031: High liquid level in T1301. 15US-0010A: Valve interlock. 12US0208: Protection for S1201. 13US-0032: High pressure in V1307. 15US-0010B: Valve interlock. 13US-0033: Nitrogen protection for SB system. 13US-0034: Protection against high oxygen temperature. 13US-0040: Automatic restart capability for P1301. Unit 16, Unit 17, Unit 30. Interlock tag number, Interlock name, Interlock tag number, Interlock name, Interlock tag number, Interlock name, Interlock tag number, Interlock name, Interlock tag number, Interlock name. 16US0001: Prevention of overheating. 17US0001: High liquid level in V1701. 30US0001: Prevention of VHP backflow. 16UZ0001: Prevention of overheating-induced shutdowns. 17US0101: High liquid level in V1704. 30US0002: Prevention of HP nitrogen backflow. 16US0004: Prevention of dry operation or overheating. 17US0002: Low liquid level in V1701. 30US0003: Prevention of overheating in hot VHP. 16US0006: Overheating of syngas. 17US0102: Low liquid level in V1704. 30US0004: Prevention of reverse flow of VHP. 16US0007: Prevention of backflow into alkali system. 17US0003: Protection for P1702. 30US0005: Prevention of overheating in hot HP nitrogen. 16US0008: Prevention of overflow in C1601. 17US0004: Protection after gas stripping. 30US0006: Prevention of LP nitrogen backflow. 16US0010: Prevention of backflow into water system. 17US0005: Prevention of acid entering L-steam system. 30US0101: Prevention of VHP backflow. 16US0002: Automatic restart capability for P1601. 17US0006: High liquid level in C1701. 30US0102: Prevention of HP nitrogen backflow. 16US0005: Automatic restart capability for P1601. 17US0007: Prevention of acid entering feed stream. 30US0105: Prevention of overheating in hot HP nitrogen. 16US0003: Overload condition at chimney. 17US0107: Prevention of acid entering feed stream. 30US0008. 16US0009: Limited opening of isolation valves. 17US0008: First-stage protection for P1702. 30US0009. 17US0009: Protection for P1708. 17US0010: Protection for P1705. 17US0014: Protection for P1706. 17US0015: Prevention of water ingress into user systems. 36US0005: Prevention of backflow into acid system. 17US0011: Automatic restart capability for reflux pump. 17US0012: Automatic restart capability for clarification pump. 17US0013: Control of P1708