Boiler water pump outlet piping vibration cause analysis and countermeasures

Recycling pipeline running, the boiler and water pump outlet piping vibration amplitude is large, the minimum flow valve recycling with open mouth still cannot eliminate vibration, affect the stable operation of the equipment. Boiler feed pump outlet valve slightly adjust, pipeline vibration reduction. The running status of in-situ exploration speed is changed to increase inverter operation, boiler pump operating conditions change, pump pipe vibration floating is bigger.

boiler and the water pump outlet piping vibration cause analysis

based on the experience of the previous pipeline vibration, the boiler and the water pump pipe that may occur during operation, can be roughly from the following several aspects to consider.

      1. Gas-liquid two flow caused by pipeline vibration

due to poor design and installation or improper operation, there are plentiful gas pipe internally generated during operation, such as not timely discharge are produced by gas-liquid two flow, two-phase flow, its soda on the pipeline's impact, causing vibration.

      2. Add water pump evaporation caused by vibration

add water pump inlet pressure is lower than the corresponding saturation pressure, inlet temperature and outlet flow of pump is less than the minimum flow, namely to produce gas. Feed water pump evaporation, the feed water water pump outlet pressure and flow rate decline or shaking, pump body and pipe abnormal noise and vibration, plus water pump motor current decline in shaking

3. Working condition of equipment change

live 1 #, 3 # boiler pump changes as the frequency control of motor speed operation, operating conditions change. When the RPM to 2000 RPM, two-thirds of flow down to a full flow, lift pressure reduced to 4/9 of the full load pressure, the trend of the pressure drop is quicker than the traffic. In the pressure drop in a certain value, flow down less, inlet flow congestion at the minimum flow recirculation, causing the breakdown of flow, causing the pipeline vibration.

boiler and the water pump outlet piping vibration solutions

according to the boiler water pump pipe vibration cause analysis, considering the following two solutions

1) Increase the by-pass pipe on recirculation piping, by-pass pipe road has a cut-off valve to control the flow. This way can make the water flow, the problem of pipeline Zhan move. But since the cut-off valve need to manually open closed, cannot achieve quantitative control, cause inefficient, such as on the by-pass pipe road add a power cut-off valve, requires a set of data lines, extra electric cut-off valve data signals back to the master control room, in order to realize the scene control

2) According to the actual operating conditions, according to the pump performance curve, find out the point when the speed of 2000 r, accounting under the condition of minimum flow and the inlet and outlet of the pump pressure value, make comparison with the actual parameters. Calculated by the valve factory to design flow throttling form and the size of area and flow, increase the minimum flow valve flow aperture and flow area, to match the speed stable operation of unit.

this scheme will need to purchase the minimum flow recirculation considering possible conditions and scheme of economy, in order to ensure the long-term stable operation, after consultation, choose to buy the minimum flow valve, realize the master control room automatic control.

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