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Method for discharging slags from circulating fluidized bed boiler based on external heat exchanger

A circulating fluidized bed and heat exchanger technology, applied in the field of electric power design, can solve single problems, achieve low slag discharge temperature, reduce slag discharge temperature, and reduce cooling water volume

Inactive Publication Date: 2012-12-05
YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST +1
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AI Technical Summary

Problems solved by technology

[0010] The invention provides a simple and easy auxiliary slagging method to solve the problem of single furnace slagging

Method used

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  • Method for discharging slags from circulating fluidized bed boiler based on external heat exchanger
  • Method for discharging slags from circulating fluidized bed boiler based on external heat exchanger
  • Method for discharging slags from circulating fluidized bed boiler based on external heat exchanger

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specific Embodiment approach

[0047] (1) The number of slag outlets of the external heat exchanger is determined according to the layout of the external heat exchanger. When the left and right are arranged symmetrically, one can be arranged on the left and right respectively, and they are arranged in the external heat exchanger with a lower steam temperature on the heating surface. .

[0048] (2) There are three types of slag discharge for external heat exchangers:

[0049] 1.1 A slag discharge port is set at the channel from the external heat exchanger to the furnace, and the circulating ash is discharged to the slag cooler through the slag discharge pipe, and a slag discharge valve is installed on the slag discharge pipe. See attached figure 2 Point A.

[0050] 1.2 Set a slag outlet at the bottom of the downstream side wall of the low-temperature heating surface of the external heat exchanger, and set a conical valve to control the discharge of the circulating ash through the conical valve, and discha...

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Abstract

The invention discloses a method for discharging slags from a circulating fluidized bed boiler based on an external heat exchanger. A slag discharge port is formed at a circulating ash outlet in a low-temperature heated surface of the external heat exchanger, and low-temperature circulating ash is discharged through the port, so that the average slag temperature at the inlet of a slag cooler is lowered effectively, a slag cooling effect is ensured, and physical sensible heat of ash is recovered effectively. The method has the beneficial effects of simple design, no increase in the slag discharge cost, average recovery of heat, reduction in cooling water amount and reduction in slag discharge temperature.

Description

technical field [0001] The invention belongs to the technical field of electric power design, and is suitable for the design and transformation of slag discharge of a circulating fluidized bed boiler with an external heat exchanger. technical background [0002] The slagging of circulating fluidized bed boilers can effectively reduce the bed pressure and maintain the material balance in the furnace. The current slagging of circulating fluidized bed boilers is furnace slagging. Due to the high temperature of the furnace, the initial temperature of the ash entering the slag cooler is high, resulting in cold The thermal load of the slag container is high, and the slag discharge temperature exceeds the design value. [0003] In order to solve the problem of high slag discharge temperature, various research institutes and manufacturers of slag coolers started from the improvement of the cooling capacity of the slag cooler itself, and carried out the combined wind and water slag c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/24
Inventor 邱亚林赵明严正波自云江李明亮陈红
Owner YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST
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