Packing Method for Plate-Type Reactor Catalyst Layers
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Solution Overview
Problem
Plate-type reactors face challenges in maintaining even catalyst packing and controlling differential pressure when a large amount of raw-material gas is introduced, leading to increased combustion reactions and reduced product yield.
Innovation Solution
The method involves regulating the porosity and thickness of the catalyst layer, dividing it into zones, and optimizing the packing material's angle of repose and charging sites to ensure even distribution and low differential pressure, using a reactor design with heat-transfer plates and partitions to manage gas flow and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large amount of raw-material gas is introduced into the reactor to increase product yield, then the productivity increases, but the differential pressure in the reactor increases which accelerates combustion reaction and reduces product yield
Solution Approach 1:
The reactor is divided into multiple reaction zones separated by heat-transfer plates, allowing independent control of catalyst layer thickness in each zone. This segmentation enables optimization of gas flow distribution and pressure management across different reaction stages, preventing excessive differential pressure buildup while maintaining high productivity
Solution Approach 2:
Different catalyst layer thicknesses are applied in different reaction zones based on local requirements. The first reaction zone has a thinner catalyst layer to reduce pressure drop, while subsequent zones have thicker layers to maximize conversion. This local optimization allows high gas flow rates without excessive differential pressure
2Productivity
If a large amount of raw-material gas is introduced into the reactor to increase product yield, then the productivity increases, but the energy consumption for compressing the gas increases
Solution Approach 1:
The reaction vessel is segmented into multiple reaction zones with heat-transfer plates between them. This segmentation creates multiple stages for gas flow management, allowing pressure to be controlled at each stage rather than requiring high compression throughout the entire reactor, thereby reducing energy consumption
3Ease of manufacture
If catalyst is packed into the space between heat-transfer plates from multiple charging sites, then the packing efficiency improves, but the catalyst packing becomes uneven depending on intervals between charging sites
Solution Approach 1:
The heat-transfer plates are pre-designed with specific spacing and configuration before catalyst packing. This preliminary structural preparation ensures that when catalyst is charged from multiple sites, the gas flow patterns and plate geometry work together to promote uniform distribution, eliminating the need for precise positioning of charging sites
Solution Approach 2:
Gas flow is utilized as a pneumatic mechanism to distribute catalyst uniformly during packing. The gas flow patterns created by the heat-transfer plate configuration help transport and evenly distribute the catalyst particles throughout the reaction zones, achieving uniform packing even when charged from multiple sites
Data Source
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AI summary
The present invention relates to a method of packing a packing material into a plate-type reactor which comprises a reaction vessel for reacting a raw material therein and a plurality of heat-transfer plates disposed side by side within the reaction vessel, the heat-transfer plates each comprising a plurality of heat-transfer tubes connected to each other at the periphery or edges of the sectional shape, the heat-transfer plates having been arranged in the reaction vessel so that the heat-transfer tubes are connected in the vertical direction, and in which a particulate packing material is charged into the space between adjacent heat-transfer plates to form a packing layer in the space, the method comprising charging the packing material into the space so that when the packing material is packed into the space from one charging site and the section where a packing layer is thus formed in the space is referred to as a packing section, then the following expression (1) is satisfied, in which 0 (°) is the angle of repose of the packing material, B (m) is the distance from the charging site for the packing material to an end of the packing section, in terms of distance in the axial direction for the heat-transfer tubes, and E (m) is 10% of a set value of the height of a highest point of the packing layer. B≦E/tanθ