Large area air outlet fluidized calcining furnace refractory lining

Abstract

The invention provides a large-area tuyere zone fluidizaton roasting furnace refractory lining. A steel fibrous reinforced castable or a high intensity low cement castable refractory is adopted to be cast with the furnace steel housing into a whole. The inside of the refractory lining is provided with a plurality of heat-proof stainless steel clips. The end surface of one end of each heat-proof stainless steel clip is welded with the furnace steel housing; the other end of each heat-proof stainless steel clip is lied inside the furnace refractory lining in a separated way or a ring-shaped link way. The heat-proof stainless steel clip is also applied by more than two layers of asphalt lac. A camber angle ring beam is arranged between the inner layer of the spherical vault and the combined furnace wall of the furnace body. The lower part of the furnace lining weight adopts the way of combing the bearing of an anchor ear beam and a furnace wall rivet clamping element. Under the condition that the roasting technology is not changed, the furnace body thins the furnace wall, and the furnace lining mass is reduced by 20 to 25 percent, thereby greatly lowering the cost, improving the leak tightness of the furnace body, preventing an isolated layer from being damaged, solving the problem that the insulating layer leaks SO2 to erode the furnace housing, improving the intensity, the air tightness and the stability of the furnace top and enhancing the whole structure of the furnace body.

Description

technical field [0001] The invention relates to a furnace lining structure of an industrial kiln, specifically a new type of refractory lining for a fluidized roaster in a large-area tuyere area, which is an improvement and replacement of the existing fluidized roaster lining, and belongs to an industrial furnace Furnace building technology. Background technique [0002] Large-area tuyere area fluidized roasting furnace is the most critical metallurgical equipment in my country's nonferrous metallurgy, chemical fertilizer, chemical industry, gold and other industries. The early manufacturing technologies were imported from companies from various countries, and the furnace lining design and installation masonry process are all without exception. With the technical characteristics and regional characteristics of the importer, many fluidized roasters have been designed in China in recent years, but the refractory lining structure and lining materials basically retain the technic...

AI Technical Summary

Problems solved by technology

Its disadvantages are: 1. The furnace lining structure is a double-composite brick structure with a boride insulation layer and a working layer; 2. Al 2 o 3 : SiO 2 =1.1:1 or so, the total ratio of the two is as high as 95%; 3. The materials of the furnace lining working layer basically belong to the semi-mullite phase with low density. Although it can meet the process requirements, it belongs to the metallurgical furnace refractory with low temperature Materials; 4. Foreign countries use processed pure and high-quality natural clay or artificially synthesized semi-mullite materials, and their costs are relatively high

If the price of materials synthesized with alumina and high-quality silica sand is high, its high temperature resistance and stability are far inferior to those of mullite and corundum, and the production cost is similar to that of mullite and corundum, which is difficult for application manufacturers to accept. There is a certain gap between the products produced with domestic raw materials and foreign indicators

In the face of harsh fluidized roasting process conditions (1100-1150°C high temperature, high concentration of SO 2 Corrosion gas, material high-speed collision impact, etc.), the lining of most fluidized roasters has serious wear and tear and shedding phenomenon in the early stage of operation, resulting in SO 2 Leakage of flue gas, extreme deterioration of the operating environment or unstable operating conditions, in severe cases, the furnace needs to be shut down for maintenance

[0003] In 2001, the inventor disclosed a technical scheme of a furnace body structure in the ZL01262210.9 patent. Although it overcomes the defects of the brick furnace lining structure in the prior art, its technology is only suitable for small kilns. Furnaces, especially kilns with small tuyere areas, cannot meet the technical requirements for the furnace linings on fluidized roasting furnaces with large tuyere areas, nor can they meet the needs of large-area tuyere areas for the transformation of tens of thousands of domestic furnaces of various types. The Production Requirements of the Domestic Lining Structure of State-Based Roasting Furnace

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