Lightweight configuration structure of refractory bricks in cement kiln

Abstract

The invention provides a lightweight configuration structure of refractory bricks in a cement kiln. The lightweight configuration structure is characterized in that the lightweight configuration structure of the refractory bricks in the cement kiln comprises kiln mouth castables, highly abrasive bricks, spinel bricks, magnesite iron bricks, mullite-SiC red bricks, mullite-SiC bricks and bottom castables from the inner part of a kiln mouth to a kiln tail. The lightweight configuration structure has the beneficial effects that the lightweight refractory material has high strength, high thermal shock, low heat conductivity and certain medium erosion resistance; standard coal can be saved for about two tonnages each day; the running conditions of a NO.2 wheel belt part are improved; chromium ion pollution sources are eliminated, and sustained development requirements are met; and the yield is increased, and refractory brick inspecting and repairing cost is reduced.

Description

technical field [0001] The invention relates to a cement rotary kiln, in particular to a lightweight configuration structure of refractory bricks in a cement kiln. Background technique [0002] At present, the configuration and use of refractory bricks in the existing cement kiln: such as figure 2 As shown, 1. First, due to the large variety of bricks used in the kiln, it appears messy, which not only increases the usual refractory brick management, but also increases the management cost; second, the service life of the bricks in the kiln cannot reach the synchronization effect, and the And the front transition zone generally only has a service life of ten months or even less. The maintenance interval of kiln mouth castables, magnesia-chrome bricks, spinel bricks and anti-flaking bricks is generally 4 to 6 months. In this way, the maintenance frequency of refractory bricks in the whole kiln is about 2 to 3 times per year, and individual kilns reach 3 times. ~4 times per ye...

AI Technical Summary

Problems solved by technology

The maintenance interval of kiln mouth castables, magnesia-chrome bricks, spinel bricks and anti-flaking bricks is generally 4 to 6 months. In this way, the maintenance frequency of refractory bricks in the whole kiln is about 2 to 3 times per year, and individual kilns reach 3 times. ~4 times per year, which increases the maintenance time and labor intensity, and increases the cost of clinker. At the same time, waste bricks containing chromium will cause certain hidden dangers to the environment.

[0003] 2. The existing configuration has major problems in the firing zone and the pre-transition zone;

[0004] ①The disadvantage of spinel bricks is that they are fragile during construction and cause uneven consumption; at the same time, the thermal conductivity is relatively high, which makes the temperature of the cylinder near the No. 2 wheel belt high, which causes certain hidden dangers to the operation of the equipment

[0005] ②Affect the operation of the equipment: the thermal conductivity of magnesia-chrome bricks or spinel bricks is large (≥2.7W / m·K), which makes the temperature of the outer wall of the kiln shell higher (about 380°C, and can reach 420°C at high temperatures), It is very easy to be heated and expanded, so that the supporting rollers in the middle of the kiln are under greater pressure, and the temperature of the supporting roller tiles rises and deforms, especially in the later period of use or in summer, which brings great hidden dangers to the normal operation of the equipment;

[0006] ③Unsatisfactory energy-saving effect: the thermal conductivity of magnesia-chrome bricks or spinel bricks is large (≥2.7W / m·K), which makes the temperature of the outer wall of the kiln shell higher (generally above 380°C), which increases the unit cost of clinker

[0007] ④It is not conducive to cost saving: due to the large proportion of magnesia-chrome bricks or spinel (2.9-3.0g / cm3), it is 10% heavier than silica-mo red bricks (1.35 t / m), which is not conducive to protecting the kiln shell increased costs

[0008] ⑤ Not conducive to storage and lower management costs: Magnesia-chrome bricks and spinel bricks are alkaline materials, which are very easy to absorb moisture in the southern region, and the internal crystal phase transformation causes brick pulverization and hydration, which affects the use at least, and seriously It will lose the use value and bring great pressure to warehouse management; and the production cycle of magnesia-chrome bricks and spinel bricks is long, it is difficult to prepare bricks reasonably, and it takes up more funds

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