Single-component flexible sealing grease

Abstract

The invention relates to single-component flexible sealing grease, which is mainly applied to the sealing of the cylinder junction surface of a steam turbine of a thermoelectric generator unit. The sealing performance of a junction surface of the thermoelectric generator unit can guarantee whether the unit can safely operate at high temperature and high pressure, but the prior sealing material fails to maintain the sealing performance at high temperature and high pressure. The sealing grease is characterized in that the sealing grease is a liquid pasty fluid at normal temperature, is easy to store and construct, and can be quickly cured when the sealing grease is heated to certain temperature; and a colloid is changed into a sealing material with certain toughness, can resist high temperature of 680 DEG C and high pressure of 320MPa, is surface chemistry resistant and anti-creeping, and can effectively prevent gas or liquid media from being leaked.

Description

technical field [0001] The invention belongs to the field of sealant preparation, and in particular relates to a single-component temperature-resistant and pressure-resistant flexible sealing grease. Background technique [0002] With the rapid development of electric power equipment, thermal power generation has generally adopted supercritical large-capacity units, which have become the mainstream of thermal power generation equipment due to their advantages in low energy consumption per unit of power generation, energy saving and emission reduction. The steam turbine is one of the three main engines of thermal power generation equipment, and the sealing of the joint surface of the cylinder is the key to the safe operation of the whole unit under high pressure and high temperature. The operating parameters of the supercritical unit are required to be above 580°C and above 25Mpa , traditional sealing materials cannot meet this condition. As the seal of the flange surface of...

AI Technical Summary

Problems solved by technology

The steam turbine is one of the three main engines of thermal power generation equipment, and the sealing of the joint surface of the cylinder is the key to the safe operation of the whole unit under high pressure and high temperature. The operating parameters of the supercritical unit are required to be above 580°C and above 25Mpa , traditional sealing materials cannot meet this condition

As the seal of the flange surface of mechanical equipment, the commonly used sealing materials are generally divided into solid gasket type and liquid gel type. The size of the solid gasket is fixed and has no adhesion to the flange surface. There are certain limitations in application. Liquid The type can ensure 100% contact between the flange surface and the joint surface, and the sealing effect is good, but the general sealant is not resistant to high temperature, and the temperature resistance of the silicone sealant with good temperature resistance in practice cannot exceed 330 °C, and it is not durable. When the temperature exceeds 500°C, the general organic sealing materials are quickly carbonized and aged, and lose their sealing performance. However, if inorganic sealing materials are used, although the temperature resistance can reach above 1000°C, the performance of this type of sealing material is brittle, hard and has no toughness, so it is not suitable for cold storage. Sealing planes with alternating heat and certain creep