Self-deoxidization waste heat boiler suitable for sulfur-containing fuel

Abstract

The invention provides a self-deoxidization waste heat boiler suitable for sulfur-containing fuel. The self-deoxidization waste heat boiler comprises a waste heat recovery device, a flash evaporator internally provided with a steam and water separator, a deoxidization water tank communicated with the flash evaporator, a steam pocket and an evaporator arranged in a flue. A heat absorption section and a heat release section of the waste heat recovery device are connected through an ascent pipe and a descent pipe, the heat absorption section is arranged in the flue, the steam pocket is connected with the evaporator through a circulation pipeline, a boiler water supply pipe is connected with a water inlet of the flash evaporator after passing through the heat release section, and a water outlet of the deoxidization water tank is connected with the steam pocket. The flash evaporator is adopted for deoxidization, heat energy used for deoxidization is smoke waste heat of the boiler, the temperature of exhausted smoke of the waste heat boiler can be effectively reduced, waste heat of the boiler is fully used, steam does not need to be extracted in the deoxidization process after the flash evaporator is additionally arranged, the steam amount of the boiler is saved, and the efficiency of the boiler is improved.

Description

technical field [0001] The invention relates to a waste heat boiler, in particular to a self-deoxygenating waste heat boiler suitable for a sulfur-containing fuel heating furnace. Background technique [0002] Converter waste heat boilers and kiln waste heat boilers are common equipment for waste heat recovery from converters and kilns. In order to prevent oxygen from corroding equipment and pipelines, the feed water of converters and kiln waste heat boilers must be deaerated, but converters and kilns themselves do not have deaerators, so converters and kiln waste heat boilers must be equipped with deaerators separately. [0003] The deaeration methods used in the traditional technology include: chemical deaeration, analytical deaeration, vacuum deaeration and thermal deaeration. Chemical deaeration is expensive and the salt content in water increases after deaeration, which deteriorates water quality. When carbon dioxide is used to analyze and remove oxygen, the carbon di...

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Problems solved by technology

This patent uses the deaerator heater to absorb the waste heat in the boiler flue gas to heat the water in the deaerator, which can reduce the exhaust gas temperature of the waste heat boiler to a certain extent and improve the waste heat recovery efficiency; but because the water heated by the deaerator heater comes from the deaerator The water temperature of the oxygen generator is already high, which restricts the use of waste heat in the flue by the deaerator heater, so the exhaust gas temperature cannot be effectively reduced, and the purpose of effectively improving the waste heat recovery efficiency of the waste heat boiler is not achieved.

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