Circulating system of exhaust-heating boiler

Abstract

The invention discloses a cycling system of a waste heat boiler, comprising a steam bag which is provided respectively with a natural cycling water outlet pipe, a forced cycling water outlet pipe, a natural cycling reflux pipe, a forced cycling reflux pipe and a steam outlet pipe, a natural cycling heat exchanger arranged at the natural cycling heating surface of the waste heat boiler the entrance and the exit of which are respectively connected with the steam bag through the natural cycling water outlet pipe and the natural cycling reflux pipe, a forced cycling heat exchanger arranged at the forced cycling heating surface of the waste heat boiler the entrance and the exit of which are respectively connected with the steam bag through the forced cycling water outlet pipe and the forced cycling reflux pipe and a cycling pump arranged at the forced cycling water outlet pipe. The cycling system of the waste heat boiler overcomes the defect existing in a single cycling system and combines the advantages of two cycling systems, overcomes limitations on the arrangement of the natural cycling heating surface and poor effects of dust removal, reduces flux and load of the recycling pump, improves reliability, and is provided with the advantages of light accumulated dust, small volume, energy saving, etc.

Description

technical field [0001] The invention relates to a circulation system of a waste heat boiler, in particular to a mixed circulation system of a waste heat boiler with natural circulation and forced circulation. Background technique [0002] Waste heat boilers are equipment used to recover heat. For example, in the field of nonferrous metallurgy, waste heat boilers are widely used to recover the heat in the flue gas of smelting furnaces. [0003] In the prior art, the water circulation system in the waste heat boiler adopts a single circulation mode, that is, natural circulation or forced circulation is used alone. Chinese utility model patent ZL200170008023.3 discloses a pressureless natural circulation boiler waste smoke heat recovery device, which consists of a shell, a heat absorber, a fixed plate, hot flue gas, circulating water, etc. The heat absorber is a tube type, composed of Rows of tube-type or plate-type heat sinks are connected in series, and the heat sinks are in...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a hybrid circulation system combining natural circulation and forced circulation. The system divides the heating surface of waste heat boiler into natural circulation heating surface and forced circulation heating surface. The hybrid circulation system can give full play to the advantages of the two circulations. The two circulations operate independently, which meets the requirements of the forced circulation heating surface, and the entire circulation system does not completely depend on the forced circulation. The reliability is improved, the investment in auxiliary equipment is low, and the electric energy Less consumption, lower cost

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