Heat load regulating device for boiler safety valve and regulating method thereof

Abstract

The invention relates to a heat load regulating device for a boiler safety valve and a regulating method thereof. The heat load regulating device for the boiler safety valve comprises a bonnet, an upper valve body, a lifter, a lower valve body, a valve spool, an external thread bushing, a shoulder arranged on the upper portion of the valve spool, a spring seat arranged on the lower portion of thevalve spool, and a spring. The heat load regulating device for the boiler safety valve is characterized in that a clamping arm is arranged on the upper portion of the valve spool, a clamping groove is arranged at one end of the clamping arm, the valve spool is clamped by the clamping groove, a clamping arm internal thread hole is arranged in the middle of the clamping arm, a slider is arranged atthe other end of the clamping arm and connected with a vertical column, an upper end seat is arranged at the top of the vertical column, a slide slot is arranged in the middle of the vertical column,a lower end seat is arranged on the lower portion of the vertical column, a base is arranged at the bottom of the vertical column and is connected with a clamping mechanism through a bolt, the slideris slidably connected with the slide slot and sequentially, a lead screw sequentially penetrates through the upper end seat, the clamping arm internal thread hole and the lower end seat and are respectively rotationally connected with the upper end seat and the lower end seat through bearings, and an external thread of the lead screw meshes with an internal thread of the clamping arm internal thread hole. The heat load regulating device for the boiler safety valve is simple in structure, flexible in operation, labor-saving and time-saving and safe and reliable.

Description

technical field [0001] The invention relates to the technical field of explosion-proof safety of power plant boilers, in particular to a thermal load adjustment device and an adjustment method for boiler safety valves. Background technique [0002] Boiler safety valve is an automatic pressure relief device for overheating of high-temperature and high-pressure steam boilers, and spring-type safety valves are generally used in power plant boilers. Taking a 75-ton boiler in a power station as an example, its working rated pressure is 5.3 MPa and its working temperature is 480 degrees. Because the factory spring safety valve is at normal temperature, using compressed air to test the constant pressure, there is a temperature difference between the actual working condition and the normal temperature setting pressure, so the deviation between the normal temperature constant pressure and the actual working condition is caused. . For this reason, it is necessary to adjust the t...

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Problems solved by technology

Because the external thread of the external thread sleeve meshes with the internal thread of the internal thread hole of the valve body boss, its contact surface expands under high temperature and high pressure, resulting in a decrease in strength, which will cause thread failure during adjustment, and even steam in the furnace due to tripping Leakage accident; when the pressure of the boiler safety valve needs to be reduced, because the actual pressure of the boiler safety valve cannot be accurately known, the spring can only be judged and adjusted by the feel of the professional lifting the lifting frame and the discharge of steam at the valve port The pre-tightening force and poor stability often result in the opening of the boiler safety valve due to inaccurate control of the lifting amount, causing the steam in the boiler to leak out for a long time, wasting energy and affecting normal production

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