One Question per Day on Moving Equipment 20181206
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What should be done if there is a disruption in the circulating water during unit operation? 1) That is, manually shut down the steam turbine generator set while keeping the condensate system and vacuum pump operating. (2) Promptly cut off and close the bypass system, shut down the main and reheat steam pipes leading to the condenser’s drain, and prohibit the activation of the 5% start-up bypass from the boiler to the condenser. (3) Pay attention to the temperature changes of various users in the closed water system. (4) Strengthen the monitoring of lubricant temperature, bearing metal temperature, and bearing return oil temperature. If the bearing metal temperature or return oil temperature rises to near the limit, a vacuum-based emergency shutdown should be initiated. (5) Close the inlet and outlet valves for the condenser’s circulating water; wait until the exhaust steam temperature drops below the specified value before restoring the circulation of water in the condenser. (6) Check that the safety diaphragm of the low-pressure cylinder is not damaged; otherwise, notify the maintenance team to replace it promptly
(1) Immediately shut down the turbine generator set manually in an emergency, while keeping the condensate system and vacuum pump operational. (2) Promptly cut off and close the bypass system, shut off the main and reheat steam pipes to the condenser’s drain, and prohibit the use of the 5% startup bypass from the boiler to the condenser. (3) Pay attention to the temperature changes of various users in the closed-loop water system. (4) Strengthen the monitoring of lubricant temperature, bearing metal temperature, and bearing return oil temperature. If the bearing metal temperature or return oil temperature rises to near the limit, a vacuum-based emergency shutdown should be initiated. (5) Close the inlet and outlet valves for the condenser’s circulating water; wait until the exhaust temperature drops below the specified value before resuming the circulation of water in the condenser. (6) Check that the safety diaphragm of the low-pressure cylinder is not damaged; otherwise, notify the maintenance team to replace it promptly.
(1) Immediately shut down the turbine generator set manually in an emergency, while keeping the condensate system and vacuum pump operational. (2) Promptly cut off and close the bypass system, shut off the main and reheat steam pipes to the condenser’s drain, and prohibit the use of the 5% startup bypass from the boiler to the condenser. (3) Pay attention to the temperature changes of various users in the closed-loop water system. (4) Strengthen the monitoring of lubricant temperature, bearing metal temperature, and bearing return oil temperature. If the bearing metal temperature or return oil temperature rises to near the limit, a vacuum-based emergency shutdown should be initiated. (5) Close the inlet and outlet valves for the condenser’s circulating water; wait until the exhaust temperature drops below the specified value before resuming the circulation of water in the condenser. (6) Check that the safety diaphragm of the low-pressure cylinder is not damaged; otherwise, notify the maintenance team to replace it promptly.
During unit operation, in the event of a disruption in the circulating water supply, the following actions should be taken: (1) If it is caused by the accidental closure of the condenser circulating water inlet valve, and this is detected before the valve is fully closed, efforts should be made to restore water supply, and the load should be reduced rapidly depending on the vacuum level. (2) If detection is delayed, or if the circulation of water is interrupted due to a power loss or tripping of the circulation pump, it must be handled as an emergency shutdown without disrupting the vacuum. (3) During and after shutdown, circulating water should not be supplied to the condenser immediately; generally, it is necessary to wait until the exhaust temperature of the low-pressure cylinder drops below 50°C before supplying circulating water to the condenser. (4) After the unit is shut down, it is strictly prohibited to discharge steam or water into the condenser. (5) Check whether the low-pressure cylinder exhaust safety valve operates and is damaged.
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(1) Immediately shut down the turbine generator set manually in an emergency, while keeping the condensate system and vacuum pump operational. (2) Promptly cut off and close the bypass system, shut off the main and reheat steam pipes to the condenser’s drain, and prohibit the use of the 5% startup bypass from the boiler to the condenser. (3) Pay attention to the temperature changes of various users in the closed-loop water system. (4) Strengthen the monitoring of lubricant temperature, bearing metal temperature, and bearing return oil temperature. If the bearing metal temperature or return oil temperature rises to near the limit, a vacuum-based emergency shutdown should be initiated. (5) Close the inlet and outlet valves for the condenser’s circulating water; wait until the exhaust temperature drops below the specified value before resuming the circulation of water in the condenser. (6) Check that the safety diaphragm of the low-pressure cylinder is not damaged; otherwise, notify the maintenance team to replace it promptly.
During unit operation, in the event of a disruption in the circulating water supply, the following actions should be taken: (1) If it is caused by the accidental closure of the condenser circulating water inlet valve, and this is detected before the valve is fully closed, efforts should be made to restore water supply, and the load should be reduced rapidly depending on the vacuum level. (2) If detection is delayed, or if the circulation of water is interrupted due to a power loss or tripping of the circulation pump, it must be handled as an emergency shutdown without disrupting the vacuum. (3) During and after shutdown, circulating water should not be supplied to the condenser immediately; generally, it is necessary to wait until the exhaust temperature of the low-pressure cylinder drops below 50°C before supplying circulating water to the condenser. (4) After the unit is shut down, it is strictly prohibited to discharge steam or water into the condenser. (5) Check whether the low-pressure cylinder exhaust safety valve operates and is damaged.