Exhaust-heat boiler

Abstract

The invention discloses an exhaust-heat boiler. The exhaust-heat boiler comprises a furnace body, a flue gas inlet, an flue gas outlet, a water-cooling wall arranged in the furnace body, a plurality of nozzles of air supply which are arranged in different height to achieve stratified combustion in the furnace body, a plurality of air inlet valves connected with a plurality of the nozzles of air supply, an air inlet pipeline which is connected with the air inlet valves, a plurality of temperature sensors which are arranged in the furnace body and used for detecting flue gas temperature, an oxygen sensor which is arranged in the furnace body and used for detecting oxygen concentration in the furnace body, and a controller which is used for controlling the air inlet valves according to the flue gas temperature and the oxygen concentration. The exhaust-heat boiler controls the air inlet valves according to the flue gas temperature and the oxygen concentration, thereby achieving secondary combustion of organic matter in the flue gas and achieving control over secondary combustion temperature and deflagration of the organic matter. The exhaust-heat boiler is easy to operate, and the safety and the reliability of the exhaust-heat boiler can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of rare metal smelting, in particular to a waste heat boiler. Background technique [0002] In the smelting of rare and precious metals, the flue gas discharged from the metallurgical furnace contains a large amount of unburned combustibles, of which the main components of the unburned combustibles are organic matter, so the unburned combustibles must be completely burned after entering the waste heat boiler , otherwise in the process of lowering the flue gas temperature, the incompletely burned organic matter will be converted into dioxins. Once the dioxins are brought into the subsequent flue gas treatment system, it will cause an increase in treatment costs and environmental pollution, and reduce the The service life and operating rate of the waste heat boiler. Contents of the invention [0003] This application is made based on the inventor's recognition and discovery of the following problems: [00...

AI Technical Summary

Problems solved by technology

Among them, the deflagration of organic matter will cause the flue gas temperature to rise rapidly and the volume to expand sharply, which will cause the flue gas pressure in the waste heat boiler to rise, and the heating surface of the waste heat boiler will bear excessive flue gas pressure, which will easily cause the furnace body to explode; because the flue gas contains Halogen elements, high flue gas temperature will lead to high temperature corrosion on the heating surface; too high pipe wall temperature, exceeding the metal temperature resistance, will cause the heating surface to burst

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