China Drying Network News On September 5, Liaoyang Petrochemical successfully completed a series of R&D operations such as scorching, chlorination, reduction, and sulfidation of PAI-01 catalysts, and successfully regenerated the domestically produced catalysts in the PetroChina system for the first time.
The regeneration of this catalyst has achieved remarkable results. It has increased the conversion rate of ethylbenzene in the 250,000-ton/year paraxylene plant of Liaoyang Petrochemical by 5%, and the production of paraxylene by 1.5 tons/hour.
According to reports, the PAI-01 isomerization catalyst is an ethylbenzene conversion catalyst independently developed by PetroChina. It was first used in the 250,000 tonne/year paraxylene plant of Liaoyang Petrochemical Corporation in 2009. It has been operating for 3 years continuously, and its activity and choice Sexuality has declined. In order to increase the activity of the catalyst, reduce the operating cost, increase the conversion of ethylbenzene and the production of p-xylene, the technical force of Liaoyang Petrochemical Company will scorch and regenerate the catalyst. Under the guidance of technical experts of the China Petroleum and Petrochemical Research Institute, the key links such as temperature difference, temperature increase rate, and oxygen content control at the reactor entrance during regenerative scrambling were repeatedly demonstrated, and a scientific regeneration program was formulated, and the PAI- Type 1 isomerization catalyst regeneration.
The chain grate is the combustion equipment of coal-fired steam boiler. There are three main types and structures: chain belt grate, scale grate and beam grate.
1. Chain belt grate. The chain belt grate is a wide circular chain belt which is surrounded by and supported on the the front and rear axles via the chain wheels. At present, ZOZEN packaged chain grate steam boiler mainly adopts the large-block chain belt grate with a capacity of 1-20 tph.
2. Scale grate. The scale grate has many advantages. The obvious one is that there is less coal leakage. The scales can be replaced without shutting down the boiler. The ventilation is balanced, and the ventilation section is relatively small (6%). The chain grate bars only bears the stress or high temperature instead of both of them, which improves the working conditions of the chain grate.
3. Beam grate. Its main feature is that the width and length of the grate can be extended in a wide range, and the tonnage of the boiler can be larger. At present, the tonnage of the domestic beam chain grate steam boiler can reach 240 tph. The grate is featured with long service life, good durability, smooth arrangement and convenient replacement.
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