Combined purification system for waste incineration smoke and technology of combined purification system

Abstract

The invention discloses a combined purification system for waste incineration smoke and a technology of the combined purification system. The combined purification system comprises a spraying deacidification system, a dust remover, a smoke cooler, a smoke washing tower and a smoke reheater. Firstly, smoke passes through the spraying deacidification system to be subjected to pre-deacidification, then passes through the dust remover, so that solid particles in the smoke are removed, and enters the smoke washing tower for deep washing after cooled by the smoke cooler; and purified smoke is discharged into the air by an induced draft fan after heated by the smoke reheater. Waste water produced by the smoke washing tower is firstly used as a heat conduction medium for the smoke cooler and the smoke reheater and then used as an absorbing agent for the spraying deacidification system to prepare water, engineering investment and operation costs required by a traditional wet process technology for treating a large amount of waste water are saved, water consumption of a smoke treatment system is reduced, and a large number of water resources are saved; and waste heat in the smoke is fully used, and energy consumption is reduced, environment-friendly emission indexes are improved, and the stability operation level of equipment is improved.

Description

[0001] technical field [0002] The present invention relates to environmental engineering, and relates to a flue gas purification technology produced by incineration of waste such as domestic garbage, medical waste, hazardous waste and industrial waste, in particular to a waste incineration flue gas purification system and its purification process. Background technique [0003] With the process of urbanization and the development of industry and medical and health services, the treatment and disposal of various wastes has attracted more and more attention. As one of the most effective means of disposing of waste, waste incineration has been widely used. [0004] Because garbage is a mixture of complex components, it contains a part of organic compounds and chlorides, sulfides, fluorides, etc., and also contains a large amount of heavy metals. The waste incineration process will produce HCl, SO 2 , HF, NOx and other acid gases and pollutants such as dioxins are mixed in th...

AI Technical Summary

Problems solved by technology

However, in actual operation, due to the influence of factors such as the manufacturing quality of the bag filter, operational defects, improper maintenance, and long-term aging of the bag, it is generally difficult to continuously ensure that the actual dust emission concentration is controlled at 10mg / Nm 3 Below the level, the fly ash concentration in the flue gas after the bag filter in most factories is 30mg / Nm 3 about

[0016] To sum up, the current single flue gas purification technology has problems in different aspects and degrees.

[0017] Recently, with the improvement of environmental protection requirements, some combined processes have emerged, such as "dry + wet", "semi-dry + dry", etc. Compared with a single process, the combined process improves the purification of flue gas efficiency, but the operating cost has also been greatly improved, and there are still some different problems, that is, the original problems in a single process have not been completely solved by the combination of several processes

For example, "dry method + wet method" will produce a large amount of high-concentration wastewater, and the problem of large energy consumption in the original wet method has not been resolved; "semi-dry method + dry method" will increase the consumption of absorbent and the production of fly ash, And the concentration of smoke and dust emissions has not been better controlled, etc.

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