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Operation Condition Analysis of Zero Flush Pump in New Flushing System
The fourth paragraph of the extraction as a working steam source of the steam feed pump has been able to meet the current needs of the water supply at this time should be the previous auxiliary steam driven by a small machine steam source switch to the normal working steam source, The operation of the machine will be a small machine high and low pressure off the door, and the door is completely closed when the steam source switch to complete the work quickly, due to inertia, the speed of small machines is still as high as 34567 or so, the steam source is switched over, And then quickly by the normal work of steam to small machine speed up to bring the load phase, thus ensuring the two normal operation of the steam feed pump According to Yiyang plant operating experience, in the absence of electric pump, according to the above mode of operation, it is entirely possible To ensure that the unit in the cold all the time the boot Sheung Shui need the same, in the warm state and hot boot the same pump can meet the needs of boot In addition, the hot boot, in addition to the use of auxiliary steam, but also can be directly from the high pressure Steam source as a steam pump working gas source, the boiler heat storage to ensure the ignition before the steam needs, in this way, at the specified load point 1,1, also to small machine Pressure steam source switching operation. Unit outage, to ensure the operation of small machine technology As there is no electric pump, if the unit is still out of protection according to the protection requirements, that is, the trip unit to protect the shutdown pump, the unit is unable to water and the situation of the Griddle, which is Not allowed In order to ensure that the unit outage process and the unit outage, the pump can still be normal to the unit into the water, Yiyang Power Plant under the premise of ensuring unit safety, the protection of the water pump made the corresponding changes in the original logic Boiler> Action achieved. That is, the machine will trigger the furnace first, then the small machine will be tripped and the small machine will be tripped. After the modification, the steam pump will not trip at the same time when the machine is tripped. That is, the small machine can continue to operate, but at this moment, Loss, so in addition to guarantee the host machine is still running small machine after tripping. But also the small machine high and low pressure control door to make the appropriate changes in the original design of small high-pressure steam source is in the low-pressure control valve fully open and then according to the water pump output required by the automatic with the device to control its opening, and the door in the low-key Open case, high-profile door will not be open, even if manual operation can not be achieved Clearly, according to the original logic, the small machine can not meet the requirements of Sheung Shui even without tripping In order to correct this deficiency, Yiyang Power Plant without affecting the small machine Shuangqi Source operating characteristics in the case of a small machine; control added a small machine high source steam input allows the button, the role of the button is high pressure steam source can not spare, do not press the button, so that even if the low-pressure steam source Can not meet the requirements, the high-pressure steam source is not more than appropriate, but not to exceed the maximum, otherwise the shutdown may have a negative impact on the way, such as sliding shut down and other units outage, the drum as soon as possible to the highest water level After the water level of the unit is out of service, the main steam can not guarantee the operation of the small unit and the small unit can not operate for a long time under the empty load. Therefore, the unit should be timely Dehydrated water system on the furnace side of the manual door to carry out an inspection of the work of tight pressure to avoid the valve lax so that the drum level drops too fast, the lack of electric pump as an accident condition, the pump can only guarantee normal shutdown shutdown water requirements or not enough , But also to ensure that the accident under the Sheung Shui requirements, or the operation of the paper discussed in this article should not be used as a result of on-site accidents and more different situations, according to the characteristics of this paper only discusses the full operation of the unit fault trip the most Harsh conditions, such as a single steam pump failure will no longer be discussed Unit trip at full capacity, prone to overpressure the boiler, at the same time as the reaction speed of operating personnel vary, generally short-term boiler water shortage But as long as properly handled and timely changes in the way the pump is running, basically to meet the operational requirements of the site Usually unit tripping conditions, the operator should promptly open a small machine high-pressure regulating door and quickly enhance the outlet pressure of the pump to reach the current The pressure value required for water supply is suddenly dropped due to the unit's load.