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High-performance honeycomb ceramic heat accumulator and preparation process thereof

A technology of honeycomb ceramics and preparation process, which is applied in the field of honeycomb ceramic regenerator and its preparation process. Performance and damage resistance, increase the hole wall density, improve the effect of thermal conductivity

Inactive Publication Date: 2012-12-12
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, like other honeycomb ceramic regenerators, due to the poor extrusion rheology in the direction of vertical feeding and discharging during the extrusion molding process, the matrix structure of the hole wall is loose, the strength is low, and the thermal conductivity is poor. Slag penetration and erosion are serious, which in turn aggravates the damage of the heat storage body and affects the heat transfer performance of the heat storage body

Method used

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  • High-performance honeycomb ceramic heat accumulator and preparation process thereof
  • High-performance honeycomb ceramic heat accumulator and preparation process thereof

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preparation example Construction

[0019] There are two methods for the preparation of the above-mentioned honeycomb ceramic regenerator: the first method includes batching, trapped material, mud grinding, extrusion molding, microwave baking, ceramic substrate immersion, oven baking, green body shaping and high temperature The step of firing; the process of mode 2 sequentially includes the steps of batching, trapping, crushing, extruding, microwave baking, oven baking, green body shaping, high temperature firing, and ceramic matrix soaking.

[0020] The specific operation steps of the process of mode one are as follows:

[0021] 1. Ingredients: According to the formula of ceramic materials, according to the amount of single stirring and mixing, calculate the dosage of various raw materials, select various raw materials with suitable particle size and components that meet the requirements, and weigh various raw materials according to the calculated dosage. Stir in a blender until the mixture is uniform, then add...

Embodiment 1～3

[0032] Embodiments 1 to 3: According to the process of mode one, the hole wall permeable layer 3 is after the microwave baking step, and the ceramic substrate 2 is respectively placed in a concentration of 25 (wt)%, 30 (wt)% or 40 (wt) % aluminum dihydrogen phosphate aqueous solution for 1 hour, take it out and blow it with high-pressure air, dry it in the shade, and then put it into the oven for baking, and it is formed by drying. Compared with the heat storage body without soaking treatment, the matrix density of the pore wall of the soaked heat storage body is increased by 5%, 8% and 11% respectively, and the heat storage body is resistant to heat along the parallel and vertical directions of the honeycomb cells 1. The compressive strength is increased by 0.5 times, 0.8 times and 1 times respectively.

Embodiment 4～6

[0033] Embodiments 4-6: According to the process of mode two, the permeable layer 3 of the hole wall is after the high-temperature firing step, and the ceramic substrate 2 is respectively placed in a concentration of 30 (wt)%, 45 (wt)% or 60 (wt) % phosphoric acid aqueous solution for 4 hours, take it out and blow it with high-pressure air, dry it in the shade, and then dry it. Compared with the heat storage body without soaking treatment, the matrix density of the pore wall of the heat storage body after soaking treatment is increased by 5.5%, 9% and 10% respectively, and the heat storage body is along the parallel and vertical directions of the honeycomb cells 1 The compressive strength increased by 0.6 times, 0.7 times and 0.9 times respectively.

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Abstract

A high-performance honeycomb ceramic heat accumulator and a preparation process thereof are disclosed. The heat accumulator comprises a ceramic basal body on which honeycomb grids are densely distributed, wall surfaces of the honeycomb grids are covered with a hole wall penetrative layer. The preparation process thereof comprises in sequence the steps of: blending mixture, ageing mixture, grinding, extrusion and formation, microwave baking, baking in a baking oven, billet shaping and high-temperature firing, and further comprises a step of soaking the ceramic basal body; the step of soaking the ceramic basal body comprises soaking the ceramic basal body in inorganic chemical binder aqueous solution or sol binder aqueous solution either between the steps of microwave baking and baking in the baking oven or subsequent to high-temperature firing, so that the inorganic chemical binder or the sol binder penetrates toward the wall surface of the ceramic basal body to fill up micro pores of the wall surface of the ceramic basal body; and the step of soaking the ceramic basal body further comprises taking out, purging, shade-drying and baking the ceramic basal body. The basal body thereof has dense organizational structure, high thermal conduction coefficient, large comprehensive mechanical strength and even grid stress, and can reduce slag penetration, improve heat exchange efficiency and prolong service life.

Description

technical field [0001] The invention relates to a ceramic regenerator on a regenerative burner of an industrial furnace, in particular to a honeycomb ceramic regenerator and a preparation process thereof. Background technique [0002] Regenerative combustion technology is an energy-saving and environmentally friendly combustion technology widely used in industrial furnaces in iron and steel metallurgy, machinery, petrochemical, building materials, nonferrous metallurgy and other industries. The ceramic regenerator is the intermediate carrier for the regenerative burner to complete the waste heat recovery and utilization of the flue gas. Through the periodic heat storage and heat release of the ceramic regenerator, the heat of the high-temperature flue gas is transferred to the combustion-supporting air or gas at room temperature, and the smoke is realized. The recovery of gas waste heat and the high temperature preheating of combustion air or gas achieve the purpose of energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D20/00C04B38/00C04B35/622C04B41/85
CPCY02E60/142Y02E60/14
Inventor 欧阳德刚蒋扬虎罗安智周章华邵东余晴王海清李明晖罗巍朱善合陈超丁翠娇刘占增宋中华杨超
Owner 武钢集团有限公司
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