Three-way pulverized coal expansion joint

Product Introduction

        1. Overview and Core Features

Three-way pulverized coal expansion joint is a compensation device specially designed for pulverized coal conveying pipeline system. It is mainly used to absorb the pipeline caused by thermal expansion and contraction, equipment vibration or foundation settlementAxial, lateral and angular multidirectional displacementTo ensure the stable operation of the pipeline system under complex working conditions. Its typical application scenarios include coal-fired power plants, steel plants, cement plants and other industrial fields, especially suitable for high-temperature and high-pressure pulverized coal conveying pipelines near boiler burners.

        2. Structure and Material

• Main structure: byBellows, deflectors, insulation, seals and flanges/connectionsSome models contain wear-resistant lining and cold tight adjusting device.

• Core Material：

• Bellows: Adopt1Cr18Ni9Ti stainless steelHigh temperature resistance and corrosion resistance;

• Take over: SelectedLow carbon alloy wear-resistant steelImprove the wear resistance and prolong the service life.

        3. Performance characteristics

• High temperature resistance: Operating temperature range60~450℃Adapt to the extreme environment of pulverized coal and hot air-gas-solid two-phase fluid.

• Strong sealability: Sealing structure such as flexible graphite ring is adopted to prevent pulverized coal leakage and powder accumulation.

• Flexible compensation: It can absorb displacement in any direction, has low stiffness and good flexibility, and reduces the load on the supporting structure.

• Long-life design: Optimize the forming process of corrugated pipe, and the service life can reach the 2~3 times。

        4. Technical parameters

        5. Key points of installation and selection

• Mounting Method：

• Horizontal installation: Close to the burner inlet, absorbing displacement by lateral deflection, preset cold tightness Δ Y is required.

• Vertical installation: Pre-stretching treatment is required to avoid uneven force.

• Precautions：

• It is prohibited to compensate for installation errors by the deformation of expansion joints;

• Protect bellows from welding slag damage during welding;

• Remove the transport fixtures after installation to release the compensating capacity.

        6. Application advantages

• Safety: Solve the risk of pulverized coal leakage and ensure the safe operation of the unit.

• Economy: Reduce maintenance frequency and low overall investment cost.

• Adaptability: Support customized design to meet different pipe layout requirements (such as straight pipe sections, elbows, etc.).

        7. Typical application cases

• Coal-fired generating unitsUsed for displacement compensation of primary air and tertiary air ducts;

• Industrial boiler system: Connect the burner with the pulverized coal pipeline to absorb the heat displacement.