Flue gas spraying, purifying and heat recovering system for coal burning boiler

Abstract

The invention discloses a flue gas spraying, purifying and heat recovering system for a coal burning boiler and belongs to the field of flue gas treatment or waste gas device configuration. The flue gas spraying, purifying and heat recovering system comprises a control system and the like; a separation board by which an inner cavity of a soot settling chamber is divided into two return flues is arranged in the inner cavity of the soot settling chamber; a smoke exhaust channel is communicated with the return flues; a waste heat receiving device and a dust remover are connected onto the smoke exhaust channel; a soot filter screen is arranged at the right part of a right cavity of a labyrinth type soot settling chamber; the right end of the soot settling chamber is communicated with a spraying chamber; the right end of the spraying chamber is communicated with a labyrinth type extended cooling channel; the labyrinth type extended cooling channel is communicated with a chimney; temperature controllers connected with the control system are respectively arranged in the soot settling chamber and an inner cavity of the labyrinth type extended cooling channel; the spraying chamber is connected with a water treatment system through a plurality of recovering water pipes; a plurality of water inlet pipes extend into the inner cavity of the spraying chamber; and spraying nozzles are arranged on the water inlet pipes. The flue gas spraying, purifying and heat recovering system disclosed by the invention is simple and convenient to manage; and according to the flue gas spraying, purifying and heat recovering system, emission heat of the coal burning boiler can be safely and reliably absorbed; thermal pollution, pollution from dust in the soot, pollution from sulfide, nitride and the like are reduced and flue gas is enabled to achieve non-hazardous emission.

Description

technical field [0001] The invention relates to the technical field of configuration of flue gas or waste gas treatment devices, in particular to a coal-fired boiler flue gas spray purification and heat recovery system. Background technique [0002] my country's energy structure is still dominated by polluting energy—coal. The pollution of coal-fired boilers, in addition to coal transportation, ash pollution to roads and surrounding pollution of storage sites, and fly ash pollution, flue gas emission is the biggest pollution. In the design and manufacture of general industrial coal-fired boilers, in order to avoid corrosion of the heating surface at the rear and ash blockage, and to further burn out fly ash, the exhaust gas temperature in the standard state is generally not lower than 180°C, and the highest can reach 250°C. High-temperature flue gas emission not only causes a lot of waste of heat energy, but also pollutes the environment. Therefore, economizers, dust collec...

AI Technical Summary

Problems solved by technology

High-temperature flue gas emission not only causes a lot of waste of heat energy, but also pollutes the environment. Therefore, economizers, dust collectors and other equipment are generally added to reduce the exhaust gas temperature below 200°C, and the smoke and dust emissions fall within the emission standards.

However, the exhaust gas temperature after the economizer still has usable value, and there is still room for reducing the smoke and dust emissions

Moreover, the exhaust gas temperature is too high, which also causes the thermal efficiency of the boiler to decrease.

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