Ash cleaning device for ferroalloy submerged arc furnace waste heat boiler

Abstract

The invention discloses a waste heat boiler dust removal device of a ferroalloy submerged arc furnace. The waste heat boiler dust removal device comprises a steel ball dust removal device and a solution cleaning device, wherein the steel ball dust removal device comprises a steel ball spreading device, a steel ball separating and collecting device, a material receiving device and a mechanical steel ball conveying device, the steel ball spreading device comprises a spreading and collecting hopper, air cooling spreading balls, a ball and dust separation screen and a dust box, the steel ball separating and collecting device comprises a conical collecting hopper, a dust and ball separation section and an air inlet pipe, and the solution cleaning device comprises a solution preparation pool, a water pump, a steel pipe, a rotary spraying nozzle and a material receiving device. According to the waste heat boiler dust removal device of the ferroalloy submerged arc furnace, the two dust removal devices are combined and supplement each other, the device structure is simple, operation is reliable, dust which is small in density, small in particle size, high in electrostatic adsorption capacity, large in specific area, and high in intermolecular adsorption capacity can be effectively removed, and the purposes that a waste heat boiler operates stably and dust is automatically and effectively removed are achieved.

Description

technical field [0001] The invention belongs to the field of waste heat recovery and utilization of flue gas from ferroalloy production, and relates to a waste heat boiler ash cleaning device in a submerged arc furnace waste heat power generation system. Background technique [0002] The submerged arc furnace occupies a very important position in the industrial furnace system. my country is the world's largest ferroalloy producer. In 2013, the national ferroalloy output exceeded 30 million tons, accounting for more than half of the world's total ferroalloy output. About 90% of the products in my country's ferroalloy industry are produced by submerged arc furnace electrothermal method, which consumes relatively high energy and is a key industry for national energy conservation and emission reduction. The power consumption of submerged arc furnaces accounts for 2% of the country's power generation, and power consumption has attracted much attention. Submerged arc furnace wast...

AI Technical Summary

Problems solved by technology

Its disadvantages are: it cannot clean dust continuously, and the dust removal effect on different parts of the heating surface is very different, and there are many blind spots; a large amount of cold air or steam is input, which seriously affects the thermal efficiency of the boiler; high-speed wind or steam is close to the pipe wall. There is a compaction force in the above ash; a large amount of compressed air or steam will consume a large amount of energy, which is very uneconomical

Its disadvantages are: continuous dust removal is not possible, the dust removal effect varies greatly on different parts of the heating surface, there are many blind spots, and due to the large negative pressure of the boiler, a large amount of cold air will be brought in when the sound wave is input, which seriously affects the thermal efficiency of the boiler; The applied stress value caused by vibration of different parts of the heating surface is very different, and its anti-fatigue life is different.

The disadvantage of this invention is that the uneven distribution of steel balls in this device can easily cause uneven distribution of dust deposits on the heating surface. After long-term operation, local dust deposits will form into large pieces, and the steel balls will be bonded in the deposits and stay in the dust. inside the boiler, resulting in the effective heating surface

In addition, the opening and closing of the damper set by the steel ball collection and separation device is controlled by negative pressure and the steel ball air lock device. This design causes the damper to open and close intermittently, and the cleaning air volume entering the separation section cannot enter continuously, resulting in ash enrichment in the bead ash separation section. , in severe cases, it will block the outlet and affect the operation of the steel ball cleaning device

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