Step type multi-step bed temperature bubbling bed heat exchange device

Abstract

The invention discloses a step type multi-step bed temperature bubbling bed heat exchange device. The step type multi-step bed temperature bubbling bed heat exchange device comprises a material hopper, an overheater, an evaporator, an economizer, a preheater and four boilers, wherein the positions of the four boilers are sequentially arranged from top to bottom, and the four boilers include the first boiler, the second boiler, the third boiler and the fourth boiler. The overheater, the evaporator, the economizer and the preheater are sequentially arranged in the first boiler, the second boiler, the third boiler and the fourth boiler correspondingly. The step degree of the waste heat transferring process is greatly improved on the premise that power consumption is not increased, irreversible losses of a cold and heat source in the heat transferring process are greatly reduced, and the waste heat utilization rate can be increased by 20%-30%. The probability of hood blockage and abrasion is greatly reduced, and the hood accident rate is reduced by 80%-90%. The temperature of particles leaving a cooling device is reduced to about 100 DEG C, and the device waste heat recycling rate is increased by 10%-20%.

Description

technical field [0001] The invention belongs to the technical field of heat exchange equipment, and in particular relates to a stepped multi-step bed temperature bubbling bed heat exchange device. Background technique [0002] In recent years, some high- and medium-temperature particulate matter waste heat recovery and utilization systems in the industrial field generally adopt double-layer fluidized bed cooling methods, but the existing double-layer fluidized bed cooling methods have unsatisfactory waste heat recovery effects and recovery indicators far below the international level. The existing double-layer fluidized bed cooling method has the following main problems: the bed temperature of the double-layer fluidized bed can only be set at two constant temperatures, and the setting of the temperature difference between the inlet and outlet of the cold and heat sources in the heat transfer process of each heating surface of the waste heat boiler is too large. As a result,...

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Problems solved by technology

The existing double-layer fluidized bed cooling method has the following main problems: the bed temperature of the double-layer fluidized bed can only be set at two constant temperatures, and the setting of the temperature difference between the inlet and outlet of the cold and heat sources in the heat transfer process of each heating surface of the waste heat boiler is too large. As a result, the irreversible loss in the heat transfer process is increased, and the efficiency of waste heat utilization is greatly reduced; the bed temperature of the low-temperature bed of the double-layer fluidized bed is limited by the outlet temperature of the working medium and cannot be too low, that is, the cooling device of the double-layer fluidized bed cannot cool the solid particles The temperature drops to a very low level, and waste heat recovery is not complete, resulting in a low waste heat recovery rate; in the double-layer fluidized bed cooling device, two fluidized beds are connected in series, and the fluidized medium of the low temperature bed enters the hood of the high temperature bed with a large number of particles, which is easy to Lead to blockage and wear of high temperature bed air cap

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