Method for preparing spherical catalyst and special device thereof

Abstract

The invention provides a method for preparing a spherical catalyst and a special device thereof. The method comprises the steps as follows: after being mixed, raw materials used for preparing the spherical catalyst are put into a melting furnace to be melted; melted material flows through a discharge port to a spray head which is arranged under the discharge port and is preheated to 50-1000 DEG C, and the material flows out through a spray hole at the bottom of the spray head to be cooled by converse airflow or liquid in a cooling bay to obtain the spherical catalyst; the spray head consists of a cylinder with openings at the top and the bottom, a movable porous board and a heating layer and a heat preserving layer at the external wall of a cylinder body; and the lower end of the internal wall of the cylinder body is provided with an inward lug; the movable porous board is arranged on the inward lug and can be demounted and changed freely. The invention has the beneficial effects that the prepared spherical catalyst has uniform particle size and high yield; the spray head is convenient for demounting and cleaning and can realize continuous production; the invention has simple technology and less energy consumption and is good for industrialized production.

Description

(1) Technical field [0001] The invention relates to a preparation method of a spherical catalyst and a special device thereof. (2) Background technology [0002] Before the present invention was made, people once carried out extensive research to the forming (spherical or other regular shape) method of solid catalyst, especially to the forming research of the ammonia synthesis catalyst that industry has great influence, its operational route can be roughly divided into two Type: One is the pressing and sintering forming method, that is, it is formed by melting, solidifying, cooling, crushing, pressing, and then sintering. For example, Denmark's Topsoe (Topsoe) company, Switzerland's Casale (Casale) company, and the British Empire Chemical (ICI) company all adopt this method, as well as the Soviet Union's disc granulator into balls. Sintering in helium at 1350°C also belongs to this type of process. Their disadvantages are complicated process, high energy consumption and hi...

AI Technical Summary

Problems solved by technology

Their disadvantages are complicated process, high energy consumption and high cost, and difficulty in realizing industrialized production

Such as Zhengzhou University's mechanical dispersion and fluid dispersion method into ball technology (patent CN85101604A, CN85101606), this type of method simplifies the process compared to the aforementioned method, but due to the impact or impact dispersion, the obtained catalyst particles are uneven in size, and the product shape factor is relatively small. Small, unballed fragments and fine powder (microspheres that cannot be used in industry) are more, so the yield of finished products is not high (50-70%), and it needs to be manually sorted, time-consuming and labor-intensive, and the product cost and power consumption are still high. higher

In addition, in the process of this process, because a large amount of high-temperature (about 1550°C) molten material rushes into water or liquid, it is very easy to cause strong splashing, which endangers the safety of people and equipment.

The method (ZL88108727.0) for preparing spherical ammonia synthesis catalyst by spraying with rotating granulation nozzle basically overcomes the above disadvantages, but the nozzle holes of the rotating nozzle are easily blocked, difficult to disassemble and clean the holes, cannot be continuously produced, and are difficult to realize industrialization

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