Sodium triphosphate polymerization furnace tail gas processing device and working method thereof

Abstract

The invention belongs to the field of tail gas processing, and discloses a sodium triphosphate polymerization furnace tail gas processing device, and a working method of the sodium triphosphate polymerization furnace tail gas processing device. According to the sodium triphosphate polymerization furnace tail gas processing device, a temperature control device is arranged in a wind mixing box; the top of a box body is provided with an inspection door; an inlet wind dispersion flow guide plate assembly is arranged in the box body; an ash bucket steam heat tracing device is arranged in an ash bucket; cabin wall vibrators are arranged on the two sides of the ash bucket; the external surface of the box body, the external surface of a diameter variable gas inlet pipeline, and the external surface of a diameter variable gas outlet pipeline are provided with thermal insulation devices. According to the sodium triphosphate polymerization furnace tail gas processing device, a pulse cloth bag deduster is adopted to replace a natural settling chamber and a Venturi spray device in an original production technology, mixed wind flow guiding is adopted to reduced energy consumption, recycle materials, reduce discharge, and protect the environment. The invention also provides the working method of the sodium triphosphate polymerization furnace tail gas processing device. The working method is capable of realizing high efficiency processing on disodium hydrogen phosphate and sodium dihydrogen phosphate powder mixture in high temperature flue dust, avoiding acid dew, and avoiding filter bag failure.

Description

technical field [0001] The invention relates to a pentasodium polymerization furnace tail gas treatment device in the field of tail gas treatment and a working method of the device. Background technique [0002] In the prior art, the tail gas treatment of the pentasodium polymerization furnace of the traditional phosphate plant is now treated by the cyclone front stage dust removal, the natural settling chamber, and the venturi spray device at the fan outlet, and the gas after the spray treatment is directly emptied, but it is still difficult To meet the requirements of environmental protection; for example, in the project for the treatment of tail gas from a five-sodium polymerization furnace with an annual output of 20,000 tons, the flue gas volume is 30,000 to 36,400 m3 / h, and the flue gas temperature is 250±20°C (the inlet of the dust collector drops to ~190±10°C). ) The dust concentration is 100g / Nm3, and the dew point temperature of the flue gas is about 160℃. The main...

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Problems solved by technology

[0002] In the existing technology, the tail gas of the five-sodium polymerization furnace in the traditional phosphate plant is now treated by cyclone pre-stage dust removal, natural settling chamber, and Venturi spray device at the fan outlet. The gas after spraying treatment is directly emptied, but it is still difficult Meet the requirements of environmental protection; for example, in a project with an annual output of 20,000 tons of five-sodium polymerization furnace tail gas treatment, the flue gas volume is 30,000-36,400m3 / h, and the flue gas temperature is 250±20°C (the inlet of the dust collector is reduced to ~190±10°C ) with a dust concentration of 100g / Nm3, and the dew point temperature of the flue gas is around 160°C. The main component of the flue gas is a mixture of disodium hydrogen phosphate and sodium dihydrogen phosphate powder. The nature of the flue gas is highly corrosive and viscous Strong adhesion, easy to absorb water, easy to deliquescence, easy to agglomerate after absorbing water, and contains a variety of acidic and corrosive gases, which have different degrees of impact on the life of filter bags of various materials; especially the flue gas contains sulfide, nitride, Hot phosphoric acid not only has a large corrosive effect, but more importantly, it can increase the dew point temperature of the flue gas (up to 160°C), resulting in the production of acid dew, which in turn causes the dust bag to stick to the bag

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