Device for preventing chimney rain and gypsum rain by heating inner cylinder wall of wet chimney through steam

Abstract

The invention discloses a device for preventing chimney rain and gypsum rain by heating the inner cylinder wall of a wet chimney through steam. The device comprises a steam pipeline, a temperature sensor and a microcomputer controller. The steam pipeline is arranged on the inner wall of a chimney outer cylinder and comprises a water outlet pipe and a water return pipe, and an electric valve is arranged on the water outlet pipe; the temperature sensor and the microcomputer controller are arranged on the outer wall of a chimney inner cylinder, the temperature sensor is connected with the microcomputer controller, and the microcomputer controller is connected with the electric valve. According to the device for preventing the chimney rain and the gypsum rain by heating the inner cylinder wall of the wet chimney through the steam, a steam heating mode is adopted to enable the temperature of the inner cylinder wall of the chimney to stay the same as the temperature of smoke, condensate generated on the inner cylinder wall due to the fact that the smoke dissipates heat outwards due to a temperature difference between the smoke and the inner cylinder wall and a temperature difference between the smoke and external environment is eliminated basically, the liquid drop content in the smoke and the condensate secondary entrainment phenomenon are effectively reduced, and therefore the phenomenon of the chimney rain or the gypsum rain or acid mist sedimentation nearby the chimney is effectively prevented.

Description

technical field [0001] The invention relates to the field of chimneys, in particular to a device for preventing chimney rain and gypsum rain by steam heating the inner wall of a wet chimney. Background technique [0002] The limestone-gypsum wet flue gas desulfurization process is the most widely used and mature process in the world today, and it is also the leading process for desulfurization of domestic thermal power plants. More than 90% of thermal power units above 300MW in my country adopt limestone-gypsum wet flue gas desulfurization (WFGD) technology. Desulfurization Design Technical Regulations (DL / T5196-2004) stipulates that "under design conditions, the flue gas temperature at the chimney inlet after desulfurization should generally reach 80°C or higher for discharge", so the WFGD systems installed in the early stage are basically equipped with flue gas heat exchange (Gas-gas heater, GGH). However, in actual operation, serious corrosion of GGH components and blocka...

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Problems solved by technology

[0013] However, in the current chimney with titanium steel clad plate inner tube and the chimney with too high flue flow rate, when the operating conditions exceed the normal operating range of the wet chimney, the phenomenon of chimney rain and gypsum rain cannot be completely eliminated by installing a condensate collection device. Therefore, It is urgent to develop another more efficient and reliable chimney rain and gypsum rain control device

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