(2) Immediately cut off the desuperheating water source from the feedwater pump to the boiler side reheat steam, and control the feedwater pump recirculation door according to the feedwater flow rate to prevent the feedwater pump from vaporizing.
(3) Closely monitor the temperature changes of the main and reheat steam. When the temperature of the main and reheat steam drops to 50°C, the main and reheat steam pipe traps and conduit traps are opened in time; the temperature of the main and reheat steam drops to 490°C. °C, timely open the cylinder trap; when the temperature of the main and reheat steam drops within 10 min within 5 min, or when there are other accidents, it shall immediately start the brake and stop, and timely close the door rod and leak steam to the deaerator valve and feed pump tap valve. Strictly control the heater, deaerator, condenser water level in the normal range.
Second, the control of the boiler re-ignition recovery process operation (1) due to the side of the steam temperature hysteresis, in dealing with the boiler fire extinguishing process should focus on monitoring the main side of the furnace, reheat steam temperature changes. After successful re-firing of the boiler, steam accumulation should be prevented from affecting the steam temperature in the furnace-side piping. The load rate must be adjusted according to the rise and fall of the steam temperature on the furnace side and the length of the furnace side recovery time, and the operation should be resumed as soon as possible.
(2) Adjust the shaft sealing system by increasing the steam supply of the shaft seal and adjusting the bypass of the shaft seal heater so that the vacuum of the condenser is stabilized above -90 kPa, which is a good preparation for the unit to quickly resume operation.
(3) Take the method of increasing the condenser water exchange rate to maintain a low condensate temperature, keep the condensate pressure stable at 1. OMPa; adjust the heater, deaerator and other water levels within the normal range to ensure steam bypass Condenser throat water spray.
(4) In order to prevent the return of steam to the cylinder, the main body should be promptly disconnected from the auxiliary header.
(5) For steam bypass systems that are not designed for automatic control functions, the steam bypass system should be drained and warmed. During the draining process, the valve opening should be controlled to avoid a strong impact on the pipeline.
(6) Closely monitor the changes in the axial displacement of the steam turbine, the metal temperature of the cylinder, differential expansion, and vibration, and adjust the parameters accordingly.
Third, after the stop measures (1) after the start of the gate shut-off, it should promptly close the main steam valve, confirm the main steam valve, reheat steam valve and regulating valve and high row check valve, extraction check valve closed in place, quickly close The liaison valves with external steam sources, such as the cold section to the auxiliary steam header liaison valve, the auxiliary steam header and the 4-stage extraction steam liaison valve, and the temporary liaison steam valve, etc., are also used to confirm the tightness of the closed valve.
(2) Close all the valves that are hydrophobic to the hydrophobic expansion vessel, except for the high row front hydrophobic drainage funnel valve, and all the other hydrophobic drainage funnel valves are opened to ensure that the sodas collected in the pipeline are drained quickly.
(3) When the rotor is stationary and the condenser is vacuumed to zero, stop the steam seal system in time, close the 0.8 MPa parent pipe to the shaft seal steam supply valve, and confirm that the valve is tight, and open the shaft seal for the steam mother pipe to the trench trap.
(4) Before the unit is turned on, put the low-pressure steam bypass warm-up pipe to control the opening of the steam trap so as to avoid a strong impact on the pipeline; when the steam pressure before the reheat steam valve drops to zero, the low-pressure bypass is stopped. system.
(5) The steam-side bottom drain valve of the high and low pressure heaters should be kept open, and the water level of the deaerator and the condenser should be controlled within the normal range. After the feed pump and condensate pump are stopped, all the water sources connected to the neighbors are cut off.
(6) Closely monitor the cylinder metal temperature, differential expansion, large shaft deflection, cranking current, etc. If the limit is exceeded, the cause should be identified and dealt with promptly.
Fourth, the boiler water pressure test when the relevant measures (1) steam turbine high, medium pressure cylinder metal temperature above 150 °C, if the main, reheat steam system pipeline valve is not tight, the boiler shall not be hydraulic pressure test.
(2) Carefully check the relevant valves, especially the valves connecting the main steam pipe to the turbine body should be kept tight, such as main steam valve, shaft seal high temperature steam valve, heater inlet steam valve and high pressure cylinder exhaust steam check valve. Wait.
(3) Closely monitor changes in the temperature of the cylinder metal, and changes in the pressure of the heating header and the shaft seal high temperature steam header. If it is found that the pressure of the heating header and shaft seal high-temperature steam header rises, the boost pressure shall be suspended and the treatment shall be immediately carried out. Once the metal temperature of the cylinder has been found to have dropped drastically, the hydrostatic test shall be stopped immediately.
(4) During the hydrostatic pressure test of the boiler, when the cylinder inlet and the temperature difference between the cylinders are exceeded due to the internal leakage of the valve, the hydrostatic pressure test shall be stopped in time and a “stuffed cylinder†treatment shall be quickly adopted: Recheck and confirm the cylinder and the steam source and water source thoroughly. Isolation, through the high-pressure cylinder insulation ring front steam trap, high-pressure cylinder exhaust steam trap and cylinder steam trap intermittent discharge, after the release quickly closed, and observe the cylinder temperature changes until the metal temperature is stable.
Tie Rod Hydraulic Cylinders are a type of hydraulic actuator widely used in various industrial applications. These cylinders are known for their robust construction, reliability, and versatility in providing linear force and motion.
The Tie Rod Hydraulic Cylinder consists of several key components. It typically includes a cylindrical barrel, a piston, a piston rod, end caps, and tie rods. The barrel serves as the main body of the cylinder, housing the piston and accommodating the hydraulic fluid. The piston, which is sealed within the barrel, divides the cylinder into two chambers: the rod side and the cap side. The piston rod extends from the piston and connects to the load or machinery that requires linear motion.
One distinguishing feature of Tie Rod Hydraulic Cylinders is the presence of tie rods. These rods are strategically placed around the barrel and extend from one end cap to the other, providing structural integrity and holding the cylinder together. The tie rods are typically threaded and can be easily adjusted or replaced, allowing for convenient maintenance and repair.
Tie Rod Hydraulic Cylinders are double-acting, meaning they can exert force in both the extending and retracting directions. This is achieved by introducing hydraulic fluid into the appropriate chamber to push or pull the piston and piston rod. The fluid is typically supplied through hydraulic hoses connected to ports on the end caps.
The versatility of Tie Rod Hydraulic Cylinders makes them suitable for a wide range of applications. They are commonly used in industrial machinery, construction equipment, agricultural machinery, material handling systems, and more. These cylinders can provide precise and controlled linear motion, enabling tasks such as lifting, pressing, clamping, and moving heavy loads.
In summary, Tie Rod Hydraulic Cylinders are reliable, durable, and versatile hydraulic actuators that utilize hydraulic fluid to generate linear force and motion. Their design, including the barrel, piston, piston rod, end caps, and tie rods, allows for efficient operation and easy maintenance. With their double-acting capability, they are well-suited for a variety of industrial applications requiring controlled linear motion and force.
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