System and method for detoxifying boiler flyash re-melt soldering slag

Abstract

This invention relates to a detoxification chromium slag processing system and method, in particular through the boiler ash melting of chromium slag handling system and detoxification method. Boiler ash melting system, including boiler system and fly ash melting system, referred to in the boiler system also includes a tail dust catcher, in fly ash melting system with at least a high-pressure fly ash jet machine, its ash export and high temperature region in the boiler combustion system connect, fly ash out from the tail dust catcher sent to high-pressure jet machine, then inject into the high temperature furnace region. By the system and methods of the invention boiler ash remelting and chromium-containing fly ash handling capacity of detoxification can be equivalent coal-fired boiler, not only digest the dry fly ash containing chromium which is trapped by boiler dust catcher, and carry out chromium slag complete detoxification, achieve coal saving, improve boiler combustion efficiency and the thermal efficiency.

Description

technical field [0001] The invention relates to an improvement of a chromium slag detoxification treatment system and method thereof, in particular to a system and a method for detoxification treatment of chromium slag by a boiler fly ash remelting method. Background technique [0002] The treatment of chromium slag in our country has been started since the 1960s. The Chinese patent application number 88104766.X discloses a method for detoxification treatment and comprehensive utilization of high-temperature molten chromium slag. The toxic chromium slag in the production of chromium salts is sintered Finally, as the main raw material of the blast furnace, the advanced technological process and batching treatment are adopted, and the effective components in the chromium slag are comprehensively utilized, so that the hexavalent chromium in it can be reduced in the blast furnace through batching, adding potassium feldspar, limestone and other auxiliary materials, and the high te...

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Problems solved by technology

[0006] "The Furnace Process of Cyclone Furnace Attached to Burning Chromium Slag" ("Power Engineering" 1995, Volume 15, No. 2) discloses a 65t / h high-pressure vertical cyclone furnace (see Figure 1). The principle of the melting nozzle on the cylinder is: in the axial direction of the cylinder, holes should be opened on the upper edge of the high-temperature area below the secondary tuyere, and in the circumferential direction of the cylinder, holes should be opened to ensure that the trace of the back-melting ash jet is attached to the wall as much as possible. long position, however, the literature does not specifically mention how to solve this problem

[0007] Although the above-mentioned patent documents have proposed multiple methods utilizing high-temperature reduction and detoxification in the furnace to process chromium slag, there is no description of the blast furnace, basic electric arc furnace, basic open hearth furnace, and backburning device (should be necessary) for processing chromium slag. What kind of system is used to completely detoxify the chromium-containing fly ash captured by the equipment), and the detoxification method and detoxification effect of the chromium-containing fly ash are not specified

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