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Acid-corrosion-resistant high-strength combined block for furnace lining of circulating fluidized bed boiler

A circulating fluidized bed and combined block technology, applied in the field of boiler lining, can solve the problems of easy cracking, cracks in brick joints, poor acid corrosion resistance and wear resistance, etc., and achieve high boiler utilization rate and obvious economic benefits , high economic benefits

Inactive Publication Date: 2020-05-08
巩义市瑞东耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an acid-corrosion high-strength combined block for circulating fluidized bed boiler lining, which effectively solves the problem that the existing fluidized bed boiler lining castables are not easy to use during use. Sintering, poor acid corrosion resistance and wear resistance, easy to crack, difficult to construct, easy to produce cracks at brick joints, and difficult to repair after cracking

Method used

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  • Acid-corrosion-resistant high-strength combined block for furnace lining of circulating fluidized bed boiler
  • Acid-corrosion-resistant high-strength combined block for furnace lining of circulating fluidized bed boiler
  • Acid-corrosion-resistant high-strength combined block for furnace lining of circulating fluidized bed boiler

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Effect test

Embodiment 1

[0041] Embodiment 1, the present invention is an acid-corrosion-resistant high-strength composite block for circulating fluidized bed boiler lining, which is characterized in that its main components include 30-50 parts of dense alumina, 5-10 parts of kyanite, and 10-20 parts of burnt gemstone 5-8 parts of activated alumina micropowder, 3-5 parts of zircon powder, 5-10 parts of silicon carbide powder, 3-5 parts of silicon nitride powder, 2-5 parts of pure calcium aluminate cement, wear-resistant steel 1 part of fiber, 0.5-1 part of special additive B, phosphate as a binding additive, of which:

[0042] Dense alumina is the main material, which has the characteristics of wear resistance, corrosion resistance and high strength;

[0043] Kyanite is mainly used to enhance the wear resistance of composite blocks;

[0044] Zircon powder is mainly used to enhance the thermal shock resistance of the composite block, which can make the composite block continue to expand in the high te...

Embodiment 2

[0058] Embodiment two, on the basis of embodiment one, refer to image 3 , Figure 4, the boiler lining is mainly composed of demolition blocks 1, the structure of the demolition block 1 is a cubic brick structure, the upper end of the demolition block 1 is fixedly connected with the upper card body 2 at the inner side of the boiler, and the lower end of the demolition block 1 faces One end of the side wall of the boiler is fixedly connected with the lower card body 3, and the end surface area of ​​the long card body and the lower card body 3 is half of the end surface area of ​​the cubic part of the demolition block 1, so that it is easy to assemble, and each demolition block 1 is fastened up and down to form a boiler lining When assembling, the upper card body 2 of each demolition block 1 and the lower card body 3 of the adjacent demolition block 1 are fastened and spliced, that is, each demolition block 1 is longitudinally assembled when assembling, and the upper card body ...

Embodiment 3

[0060] The third embodiment, on the basis of the second embodiment, also includes a conventional block 5, the external shape of the conventional block 5 is the same as that of the demolition block 1, and the conventional block 5 does not contain a mosaic 4, and the conventional block 5 can be combined with The conventional blocks 5 are combined with each other, and can also be combined with the demolition block 1, the only difference is that the mosaic 4 is arranged inside;

[0061] The assembly form of the conventional block 5 and the demolition block 1 is that two conventional blocks 5 are arranged between the two demolition blocks 1. Because the manufacturing process of the demolition block 1 is relatively complicated and the cost is relatively high, this setting can effectively control the cost, and can also It effectively guarantees that it can be effectively dismantled during maintenance and dismantling, taking into account both construction cost and maintenance cost.

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Abstract

The invention relates to an acid-corrosion-resistant high-strength combined block for a furnace lining of a circulating fluidized bed boiler, and effectively solves the problems of difficulty in sintering, poor acid corrosion resistance and wear resistance, easiness in cracking, difficulty in construction, easiness in cracking at brickwork joints and difficulty in maintenance after cracking in theuse process of a conventional castable for a furnace lining of a circulating fluidized bed boiler. The combined block comprises the main components: 30-50 parts of compact aluminum oxide, 5-10 partsof kyanite, 10-20 parts of flint clay, 5-8 parts of activated alpha alumina micro powder, 3-5 parts of zirconite powder, 5-10 parts of silicon carbide powder, 3-5 parts of silicon nitride powder, 2-5parts of pure calcium aluminate cement, 1 part of wear-resistant steel fibers, 0.5-1 part of a special additive B and phosphate as a binding additive. According to the invention, combined bricks are combined and buckled, and dismounting blocks and inlaying bodies are arranged, so that the problems that the lining of the existing fluidized bed boiler is difficult to construct, cracks are easily generated at brick joints, and the lining is difficult to maintain after cracking are effectively solved, the cost is low, and the practicability is strong.

Description

technical field [0001] The invention relates to the technical field of boiler lining, in particular to an acid-corrosion-resistant high-strength combined block for circulating fluidized bed boiler lining. Background technique [0002] The existing circulating fluidized bed boiler lining is poured with bottom castables, and the upper part is constructed of high alumina bricks and clay bricks. The disadvantages are as follows: [0003] The operating temperature in the furnace is low, the castable is not easy to sinter during use, the acid corrosion resistance and wear resistance are poor, and it is easy to crack; [0004] The space in the furnace is small, and the mold is not easy to support during the pouring process, and it is not easy to construct; [0005] The internal clearance height of the circulating fluidized bed boiler is more than 30 meters. During the use of high-alumina bricks and clay bricks, cracks are prone to occur at the brick joints due to temperature diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/10F23M5/02
CPCC04B35/10C04B35/66C04B2235/3248C04B2235/3463C04B2235/349C04B2235/3826C04B2235/3873C04B2235/447C04B2235/5216C04B2235/6022C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/96F23M5/02
Inventor 李辉东
Owner 巩义市瑞东耐火材料有限公司
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