A large-scale integral honeycomb ceramic regenerator and its preparation method

Abstract

The invention discloses a large-scale integrated honeycomb ceramic heat accumulator and a preparation method thereof. The preparation method comprises the following steps: rolling a preform body intocorrugated blank slices through a rolling machin; stacking the corrugated blank slices into an integrated honeycomb type corrugated green body by using an adhesive according to a peak-to-peak, valley-to-vallye and rib-to-rib way; drying, flatly cutting two ends of the corrugated green body which stretches along ripples, forming corrugated grooves vertical to a stretching direction, filling and flatly repairing the corrugated grooves by using the preform body, and sealing the two ends of the corrugated green body which stretches along the ripples; then setting decompression grooves in the end surface of the corrugated green body; putting the corrugated green body in a kiln, firstly rising the temperature to 600 DEG C at a low speed, keeping warm for 1 to 1.5 hours, then quickly rising the temperature to 1200 to 1600 DEG C, keeping warm for 2 to 4 hours, and discharging after furnace cooling, thus obtaining the integrated honeycomb ceramic heat accumulator. According to the large-scale integrated honeycomb ceramic heat accumulator and the preparation method thereof, disclosed by the invention, the original advantages of shape regularity, attractiveness and practicability, good thermal stability, small back pressure, large specific surface area, fast heat exchange and good slag resistance are kept, organic volatile matters cannot be generated during firing, the environment cannotbe polluted, and the production cost can also be reduced.

Description

technical field [0001] The invention relates to a heat storage material for waste gas treatment RTO furnaces, in particular to the improvement of the structure and preparation process of a honeycomb heat storage body. Background technique: [0002] At present, the regenerative ceramic fillers mainly include: ceramic regenerative balls, saddle rings (including Raschig rings), MLM sheet-like combined semi-regular ceramic fillers, and regular honeycomb ceramic fillers. Due to the small specific surface area, small heat transfer area, large back pressure, and weak slag resistance of ceramic heat storage balls, they have been gradually eliminated; saddle rings (Raschig rings), also known as random piles, are generally combined with honeycomb bodies and MLM sheets. It is used for aggregates, and it takes up too much space when used, so it is not the mainstream heat storage filler; MLM sheet aggregates are used for " "Shaped tooth pieces, combined together, then bonded with inorg...

AI Technical Summary

Problems solved by technology

Due to the small specific surface area, small heat transfer area, large back pressure, and weak slag resistance of ceramic heat storage balls, they have been gradually eliminated; saddle rings (Raschig rings), also known as random piles, are generally combined with honeycomb bodies and MLM sheets. It is used for aggregates, and it takes up too much space when used, so it is not the mainstream heat storage filler; MLM sheet aggregates are used for " "Shaped tooth pieces, combined together, then bonded with inorganic cement on both sides of the tooth piece assembly, and dried to form a semi-regular heat storage filler. Due to the wide range of raw materials, this product does not need to use organic lubricants, plastics, etc. chemical agent, adhesive, so the cost is very low, and the heat storage capacity is large; the disadvantage is that the product has a rough appearance, poor thermal shock resistance, easy to cut hands, and large back pressure. After the tooth is burned, it is bonded on both sides of the tooth with inorganic glue Together, the middle teeth of the tooth pieces are not bonded to the adjacent tooth pieces, only the glue on both sides is bonded together, so that many tooth pieces are combined together, because the bonding points and areas are too small; after bonding with glue, there is no further After sintering at high temperature, when RTO is filled, many products will disperse into "biscuit" pieces, sometimes as much as 10-20% loss; in addition, when used at high temperature, the MLM heat storage block is also very easy to crack into the original tooth pieces shape, resulting in the fact that the flakes are piled up, and when it is scrapped, it is extremely difficult to clean up, time-consuming and labor-intensive, and the labor intensity is extremely high

The structured honeycomb ceramic filler has the characteristics of regular shape, beautiful and practical, uniform air distribution, neat filling, convenient and simple replacement, low labor intensity, good thermal stability, small back pressure, large specific surface area, fast heat transfer, and good slag resistance. Ideal heat storage material; especially the large-scale dense honeycomb heat storage body with heavy weight, smooth inner wall, large heat storage, and extremely fast heat exchange is the most ideal heat storage material, but the high price of honeycomb heat storage body limits its further development. For large-scale use, how to reduce the price of honeycomb ceramic heat storage body while maintaining its original advantages is the development direction of honeycomb ceramic heat storage material

[0003] In addition, it should be noted that the honeycomb ceramic regenerator needs excellent plasticity and crack resistance during molding, so a large amount of organic binders, lubricants, plasticizers, etc. are added to the formula, so the preparation cost is relatively high , and during firing, in the temperature range of 100°C-600°C, a large amount of organic matter volatilizes, pollutes the environment, needs to be treated, and further increases the cost of the product

Images