Intensive cooling device for circulating ash of circulating fluidized bed boiler

Abstract

The invention relates to an intensive cooling device for circulating ash of a circulating fluidized bed boiler. The intensive cooling device comprises a separating cylinder, wherein the separating cylinder sequentially comprises a straight cylinder section, a tapered section and a dipleg section from top to bottom, and a center cylinder is arranged in the straight cylinder section; an inlet is formed in the side wall of the straight cylinder section, and intensive cooling mechanisms are arranged in the tapered section and the dipleg section. The intensive cooling device is characterized in that the intensive cooling mechanism comprises heat transfer pipes in the wall bodies of the tapered section and the dipleg section, and the axial direction of the heat transfer pipes is respectively parallel with the walls of the tapered section and the dipleg section; the upper ends of the heat transfer pipes in the tapered section and the upper ends of the heat transfer pipes in the dipleg section outwardly bend and then extend out of the wall of the separating cylinder. One side, close to the inner side of the separating cylinder, of each heat transfer pipe is connected with a heat conducting plate longitudinally running through the total length of the heat transfer pipe, and a gap is reserved between the inner side of the heat conducting plate and the inner side of the separating cylinder. The intensive cooling device provided by the invention has the advantages of small size, small metal pipeline consumption, easiness in installation, low cost, capabilities of avoiding pipeline wear and booster failure and improving the utilization rate of heating area of a separator, and is suitable for a flue gas separator of the circulating fluidized bed boiler.

Description

technical field [0001] The invention relates to a cooling device. Specifically, it is a cooling device capable of intensively cooling circulating ash, and is especially suitable for flue gas separators of circulating fluidized bed boilers. Background technique [0002] It is known in the boiler production industry that most of the flue gas separators of circulating fluidized bed boilers are equipped with circulating ash cooling mechanisms, which are cooling mechanisms arranged inside the straight barrel section and the cone section of the separator. This type of cooling mechanism mainly includes an air-cooling mechanism and a water-cooling mechanism. These two cooling mechanisms arrange pipes inside the straight section and the cone section of the corresponding separator, and respectively pass cold air and cold water into the pipes, and utilize the cold air flowing in the pipes. Or cold water exchanges heat with the pipes to cool the circulating ash that touches the pipes. ...

AI Technical Summary

Problems solved by technology

This cooling mechanism has the following disadvantages. One is that the cooling mechanism is arranged on the inside of the wall of the straight section, which is bulky and requires many metal pipes, resulting in high production costs.

Moreover, the processing is difficult, and it is difficult for general boiler manufacturers to process

Second, due to the large size, a set of cooling mechanism needs to be divided into 3~5 pieces to leave the factory, and assembled at the construction site. The installation cost is high and the cost is high.

Third, since the cooling mechanism is set inside the wall of the straight barrel section, when the boiler is running, the cooling mechanism of the straight barrel section of the separator is first impacted by the flue gas from the inlet, and the pipes in the cooling mechanism are prone to wear and burst failures

, reducing the utilization rate of the heating area of ​​the separator

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