Heavy pressure fine spray desulfurising-dusting apparatus and method for desulfurization and dust removal

Abstract

The present invention relates to a high-pressure fine-mist desulfurization and dedusting device and a desulfurization and dedusting method thereof, which can effectively solve the problem that the desulfurization device and dedusting device is single in function and poor in desulfurization and dedusting effect. A first absorption tower is communicated with the flue gas inlet pipe with a draft fan arranged in an air inlet and is connected with the outlet end of a high-pressure pump arranged on a water inlet pipe through a pipe; the two absorption towers are connected; a second absorption tower is provided with a flue gas outlet pipe which is internally provided with a demister insider and respectively connected with a chimney and a sedimentation tank; a fine-mist nozzle is arranged in the absorption tower; the bottom part of the first absorption tower is connected with a clinker chamber; the bottom parts of the two absorption towers are connected with the sedimentation tank through a three-way pipe; the sedimentation tank is communicated with an alkali recycling tank through a filter slot; a centrifugal pump on the alkali recycling tank is connected with a dynamic filter and is connected with the water inlet pipe through a recycling water pipe; the recycling water pipe is communicated with the spraying pipe and the nozzle of the absorption tower and the alkali recycling tank is provided with an alkali distribution slot; the flue gas is desulfurized and dedusted through pipes by spraying and discharged through the chimney. The device integrates the functions of desulfurization and dedusting.

Description

1. Technical field [0001] The invention relates to a high-pressure fine water mist desulfurization and dust removal device and a method for desulfurization and dust removal thereof. 2. Background technology [0002] At present, coal-fired boilers such as thermal power plants, steel, metallurgy, etc. reduce sulfur dioxide (SO 2 ) main methods include: coal washing, limestone (lime) gypsum wet method, seawater desulfurization method, flue gas circulating fluidized bed desulfurization method, electron beam desulfurization, etc. There are more than ten kinds of desulfurization devices in commercial operation or However, there are still quite a few small and medium-sized desulfurization and dust removal devices in my country. Coal-fired boilers such as thermal power plants, steel, metallurgy, etc. have dust removal methods such as electric dust removal and bag dust removal. [0003] The desulfurization efficiency of flue gas desulfurization devices for small and medium-sized coa...

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Problems solved by technology

[0004] In view of the above situation, the object of the present invention is to provide a new type of high-pressure water mist desulfurization and dust removal device and its method for desulfurization and dust removal, which can effectively solve the problems of single function of the current desulfurization and dust removal device, poor desulfurization and dust removal effect, and high cost. The technical solution is that the present invention includes a high-pressure pump and an absorption tower. The first absorption tower is connected with the flue gas inlet pipe, and an induced draft fan is installed at the air inlet of the flue gas inlet pipe. The first absorption tower is connected with the water inlet pipe through the pipe. The first absorption tower is connected to the second absorption tower through pipes, and the second absorption tower has a flue gas outlet pipe. The flue gas outlet pipe is equipped with a demister, and is connected to the chimney and the sedimentation tank respectively. , there are multi-layer high-pressure fine water mist nozzles in the first absorption tower and the second absorption tower, which are placed in sequence along the height direction of the tower. The bottom of the first absorption tower is connected with the ash chamber, and the bottom of the first absorption tower and the second absorption tower are formed by The tee pipe is connected to the sedimentation tank, the sedimentation tank is connected to the alkali circulation tank through the filter tank, and the outlet pipeline of the alkali circulation tank is equipped with a centrifugal pump, which is connected to the dynamic filter and connected to the water inlet pipe through the circulating water pipeline, and the circulating water pipeline The outlet end of the high-pressure pump on the water inlet pipe is connected with the spray pipes and high-pressure fine water mist nozzles of the first absorption tower and the second absorption tower, and the alkali circulation tank is equipped with an alkali distribution tank; the application method is that the first absorption tower The flue gas inlet pipe is connected with the boiler flue, and the flue gas enters the first absorption tower and the second absorption tower. When the flue gas rises, it encounters high-pressure fine water mist, and the small particles of dust fully contact with the high-pressure fine water mist. Condensation becomes large particles, falls under the action of gravity and is discharged into the sedimentation tank, the SO in the flue gas 2 It reacts with the high-pressure fine water mist containing alkaline water to form sulfate and sulfite into large droplets, settles and is discharged into the sedimentation tank, regenerated in the sedimentation tank, filtered through the filter tank, and separated from solid and liquid. The liquid enters the alkali circulation tank, is pumped out by the centrifugal pump, and is recycled in the fine water mist system to form a gray water closed circuit, prevent secondary pollution, reduce alkali consumption and operating costs, and achieve the purpose of desulfurization and dust removal. The flue gas is discharged into the atmosphere through the chimney

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