Double-pressure submerged arc furnace waste heat boiler with mechanical brush ash-removing device

Abstract

The invention provides a double-pressure submerged arc furnace waste heat boiler with a mechanical brush ash-removing device, wherein a boiler barrel is arranged on a support, a convection vertical shaft is arranged in the support, one end of the convection vertical shaft is provided with a smoke inlet, and the other end of the convection vertical shaft is provided with a smoke outlet. A sub-middle-pressure superheater, a sub-middle-pressure evaporator, a sub-middle-pressure economizer, a low-pressure superheater, a low-pressure evaporator and a low-pressure economizer which are fixedly arranged on a ventilation beam are arranged in sequence from the smoke inlet to the smoke outlet in the convection vertical shaft; the mechanical brush ash-removing device is arranged on each heating surface of the submerged arc furnace waste heat boiler device; an external transmission device is connected with an internal ash-removing device; the internal ash-removing device is provided with a frame-type brush fixing device; a steel wire brush with upper and lower ends being respectively and fixedly arranged on a frame is arranged on the fixing device; two groups of rollers are arranged at the bottom of the brush fixing device; each group of rollers is arranged on one guide rail; and two ends of the two guide rails are connected with the boiler ventilation beam and an inner protective plate. The double-pressure submerged arc furnace waste heat boiler with the mechanical brush ash-removing device is small in investment, convenient to reform, complete in ash removing and high in heat transfer efficiency.

Description

technical field [0001] The invention relates to a waste heat boiler, in particular to a waste heat boiler which can absorb the waste heat of the flue gas of the submerged arc furnace and effectively remove the ash in the heat exchange area. Background technique [0002] The submerged arc furnace occupies a very important position in the industrial furnace system. According to the relevant statistics of the China Ferroalloy Industry Association, my country is the world's largest ferroalloy producer. In 2010, the national ferroalloy output was 24.355 million tons, a year-on-year increase of 10.23%. More than 50% of the total 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. Electricity consumption of submerged arc furnaces accounts for 2 % of the country's power generation, and powe...

AI Technical Summary

Problems solved by technology

[0006] The disadvantages of this waste heat boiler are: the heating surface is arranged in a staggered manner, which is easy to accumulate dust, and a mechanical rapping device is used to clean dust. The dust with strong ability and not suitable for settlement is poor in cleaning effect. When the dust carried in the flue gas is deposited on the heat exchange tube, it cannot be removed by vibrating the dust. The channel is completely blocked, causing the boiler to be shut down

The disadvantage of this invention is that the uneven spreading of the steel balls in this device can easily cause uneven distribution of ash deposits on the heating surface, which affects the heat transfer efficiency of the heat exchanger, and may even cause ash deposits to form large pieces locally and make the heating surface In case of failure, a safety hazard

In addition, the steel balls are easily rusted, clumped and agglomerated when circulating in the cleaning system and temporarily stored, especially when the flue gas contains H 2 O, SO 2 In the case of gases such as gases and ash content of complex components

Once the steel balls agglomerate, it is difficult to eliminate, which will block the steel ball spreading nozzle and steel ball conduit, making maintenance difficult

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