High-position arrangement turboset auxiliary engine cooling water device based on pressure regulating water tank

Abstract

The invention relates to a high-position arrangement turboset auxiliary engine cooling water device based on a pressure regulating water tank. The high-position arrangement turboset auxiliary engine cooling water device based on the pressure regulating water tank comprises an E-1 pressure regulating water tank, an air inlet device installed on one side of the top of the E-1 pressure regulating water tank, an exhausting pressure maintaining device installed on the other side of the top of the E-1 pressure regulating water tank, a normal pressure overflow device installed on one side of the upper part of the E-1 pressure regulating water tank, a V-23 draining ball cock installed in the E-1 pressure regulating water tank and a water outlet device arranged on the bottom of the E-1 pressure regulating water tank. According to the high-position arrangement turboset auxiliary engine cooling water device based on the pressure regulating water tank, safety and stability of the process from static water injection, device starting, running, adjusting and stopping of the high-position arrangement turboset auxiliary engine cooling water system can be guaranteed, the requirement for pressure andflow of cooling water users can be met, the working conditions can be automatically switched, the requirements of modern power plant APS and high-automation level are met, and the requirements for safety, reliability and long-term running of a unit can be guaranteed.

Description

technical field [0001] The invention relates to a cooling water device for an auxiliary machine of a steam turbine unit arranged in a high position based on a pressure regulating water tank. Background technique [0002] The auxiliary cooling water system of the unit is an important system of the power plant. Its function is to provide cooling water to equipment with high cooling water quality requirements. The failure of the auxiliary cooling water system directly affects the safe and stable operation of the main equipment and auxiliary equipment; auxiliary cooling The water system adopts a closed cycle, the expansion water tank comes from desalted water and condensed water, and the cooling water of auxiliary equipment is cooled by circulating water or dry cooling tower, and its function is to provide cooling water for generators, steam turbines, boiler auxiliary equipment, especially the cooling water quality requirements are high The basic process of the auxiliary cooling...

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Problems solved by technology

[0003] The steam turbine operating platform is arranged at an elevation of 65 meters, and the height of the steam turbine plant reaches 83 meters. There are many cooling water users in the cooling water system of auxiliary equipment. The highest cooling water user is the hydrogen cooler of the unit generator, and the lowest cooling water user For each cooling water user at 0 meters, the huge difference in elevation causes the pressure difference of auxiliary cooling water at different operating floors, such as the auxiliary cooling water pressure generated by the static pressure between the hydrogen cooler of the generator and the cooling water users at 0 meters The difference is as high as 0.65MPa, and the auxiliary cooling water system is usually designed as a medium-low pressure system, and the mature design of the heat exchangers of each cooling user is usually a medium-low pressure parameter, which makes the design pressure of the auxiliary cooling water system not too high, such as Excessive cooling water pressure of auxiliary equipment during operation may cause overpressure in the coolers of cooling water users at low elevations. Especially for air-cooled units, the cooling water system of auxiliary equipment usually adopts a dry cooling tower, and the design pressure of the cooling triangle is usually 0.8MPa, and arranged at the 0-meter elevation, it is usually the key equipment that is likely to cause overpressure in the entire system; The difference between the hydrogen pressure and the internal cooling water pressure of the generator is within the acceptable range, or the flow rate required for cooling the generator cannot be reached; when the system is in stable operation, under the action of the head of the auxiliary cooling water pump, the return water pressure of the auxiliary cooling water system Reduce, users of auxiliary cooling water at high elevations, especially the pipeline behind the water outlet regulating valve of the hydrogen cooler may generate negative pressure, which may cause gasification or vacuum pipe sections of auxiliary cooling water in severe cases, causing shock and vibration to the pipeline and system. Problems such as system pressure, flow, and current fluctuations endanger the safety of the system and equipment; when the operating conditions of the system change, vacuum pipe sections may be caused, causing changes in the system water volume, which will eventually lead to fluctuations in the water level of the differential pressure water tank, which may cause the differential pressure water tank to overflow Or the water level drops causing the auxiliary cooling water pump to trip

[0004] Based on the above analysis, there are many problems in the auxiliary cooling water system of the high-level arrangement units, which seriously affect the safe and stable operation of the unit.

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