Adjustable external heat exchanger for circulating fluidized bed boiler

Abstract

The invention relates to an adjustable external heat exchanger for a circulating fluidized bed boiler. The adjustable external heat exchanger comprises a material ash cycling inlet, a burden distribution baffle wall, a feeding chamber, a material cycling air compartment, a heating surface, a material cycling chamber, a feed back chamber, a material cycling baffle wall, a material ash cycling outlet, a material cycling air distribution plate and a distribution baffle wall, wherein the central section of the material cycling baffle wall is provided with a flashboard which is positioned inside an intermediate chamber of the material cycling chamber and is tightly against the material cycling baffle wall; a sealing device is disposed on the flashboard and outside the intermediate chamber of the material cycling chamber; an actuating mechanism for adjusting the flashboard is arranged on the sealing device; and the flashboard is connected with the actuating mechanism through a screw thread connecting rod. The invention is characterized in that the actuating mechanism is used to adjust the height of the regulating valve flashboard up and down so as to realize the purpose of controlling the flow of hot ash; the invention has a simple, compact and reasonable structure; the internal heating surface of the external heat exchanger is uniformly heated so as to avoid overburn and tube explosion; in addition, by adjusting the height of the valve flashboard, the flow of hot ash flowing through the heating surface is controlled so as to realize the purpose of adjusting the caloric receptivity of the heating surface as well as the hearth bed temperature.

Description

Technical field [0001] The invention relates to an adjustable external heat exchanger, specifically for a circulating fluidized bed boiler. Its function is to control the flow of hot ash flowing through the heating surface by adjusting the height of the ram, and realize the adjustment of the heating surface absorption. The purpose of heat and hearth bed temperature. Background technique [0002] At present, most of the external heat exchangers of circulating fluidized bed boilers in China are not equipped with hot ash flow control valves, and the amount of ash entering the furnace can only be adjusted through accidental ash discharge pipes. As the hot ash temperature is as high as 900°C, it not only wastes energy, but also brings safety hazards; for example, the installation of heat recovery cooling equipment such as ash coolers will not only increase the initial investment, but also cause the complexity of the equipment system. Some imported foreign products are equipped with ...

AI Technical Summary

Problems solved by technology

Since the temperature of hot ash is as high as 900°C, it will not only waste energy, but also bring safety hazards; if setting heat recovery cooling equipment such as ash cooler, it will not only increase the initial investment, but also cause the complexity of the equipment system

Some imported products have external heat exchangers with regulating valves, and most of them use hydraulic systems to drive cone valve structures. Not only is the system complex, but the cone valves are prone to deformation and mechanical failures such as jamming, resulting in frequent operating accidents.

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