Off-line washing system and method for waste heat power generating boiler

Abstract

The invention discloses an off-line washing system and method for a waste heat power generating boiler. A boiler drum and heat exchanging pipe boxes are connected to an inlet of a pollution discharge protopipe through pollution discharge pipes correspondingly, and a pollution discharge valve is arranged on each pollution discharge pipe; an outlet of the pollution discharge protopipe is connected with a pollution discharge expander through a connecting pipe, and an inlet of the pollution discharge expander is provided with a first switch valve; the heat exchanging pipe boxes are connected with flushing water pipes, an outlet of a boiler water feeding pump is connected with an inlet of the boiler drum through a water feeding pipe, and a second switch valve is arranged on the water feeding pipe; a pipeline of the connecting pipe is provided with a connecting branch pipe, the other end of the connecting branch pipe is connected to an inlet of the boiler water feeding pump, and a pipeline of the connecting branch pipe is provided with a third switch valve; and a pipeline of the water feeding pipe is provided with a water feeding branch pipe, one end of the water feeding branch pipe is located at the front end of an inlet of the second switch valve, the other end of the water feeding branch pipe is connected to an inlet of the flushing water pipe, and a pipeline of the water feeding branch pipe is provided with a fourth switch valve. The boiler water feeding pump is used as a flushing water pump, and thus investment is saved; and the boiler water feeding pump is high in lift, strong in flushing intensity and good in flushing effect.

Description

technical field [0001] The invention relates to the technical field of waste heat power generation boilers, in particular to an off-line cleaning system and method for waste heat power generation boilers. Background technique [0002] In response to the national call for energy conservation and emission reduction and to reduce production costs, most of my country's various industrial kilns such as cement kilns and glass kilns are equipped with waste heat power generation boilers to recycle the waste heat of kilns. Because the waste gas of the kiln contains a lot of dust, especially the glass kiln burning heavy oil or petroleum coke powder, the amount of dust exceeds 1000mg / Nm 3 , resulting in severe ash on the heating area of ​​the waste heat power generation boiler. [0003] At present, the commonly used method is to equip the waste heat power generation boiler with an online soot blowing device to alleviate the ash accumulation, but the online ash removal alone cannot com...

AI Technical Summary

Problems solved by technology

[0005] 1. The furnace water is released directly and not used reasonably;

[0006] 2. The tap water in the factory area is required for flushing, and the water consumption is relatively large;

[0007] 3. Due to the high waste heat power generation boiler, a special flushing water pump needs to be installed. Generally, the head of the flushing water pump is not large, resulting in low flushing water pressure and unsatisfactory flushing effect;

[0008] 4. The acidic ash in the boiler will produce acid liquid after meeting water, which will corrode the furnace tube, so the outer wall of the tube will be corroded during flushing;

[0009] 5. The tap water used for flushing is normal temperature water, some water will remain on the pipe wall after flushing, and the SO in the flue gas will 2 It will dissolve in the water film on the pipe wall and cause corrosion to the outer wall of the pipe

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