Shell and tube heat exchanger

Abstract

The invention provides a shell and tube heat exchanger. The shell and tube heat exchanger mainly comprises a casing, heat exchange tubes, an upper head, a lower head, an upper tube plate, a lower tube plate, a middle-shell-side fluidization air distributor, a lower-shell-side fluidization air distributor, a cold spent catalyst inlet, a hot spent catalyst outlet, a hot regenerant inlet, a cold regenerant outlet and a hot stripped oil gas outlet. Heat transferring media flow in corresponding heat exchange tubes which are externally connected with temperature sensor contacts. According to the shell and tube heat exchanger, particle fluidizers are arranged in the heat exchanger to fluidize cold and hot particles, so that fluidized particles with fluid flow characteristics are obtained and flow in the heat exchanger in the flow direction, heat exchange between cold and hot solid particles is achieved, and the temperatures of the heat transferring media are monitored at any moment.

Description

technical field [0001] The invention relates to a shell-and-tube heat exchanger, which belongs to the technical field of machinery. Background technique [0002] When operating with a large solvent-to-oil ratio, in order to maintain a proper reaction temperature in the riser reactor, the regenerant must be cooled to maintain the heat balance in the reactor. The current method is to use an external heat extractor to exchange heat between the regenerant and water (steam), and cool the high-temperature regenerant to control the temperature of the process reaction process and maintain the reactor under the operating condition of a large agent-to-oil ratio. The internal temperature and heat balance, the heat taken out is used to generate superheated steam, which is incorporated into the steam pipe network. [0003] Although this method can increase the ratio of agent to oil to a certain extent, the problem with this method is that under the conditions that the carbon content of ...

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Problems solved by technology

[0003] Although this method can increase the ratio of agent to oil to a certain extent, the problem with this method is that under the conditions that the carbon content of the catalyst is roughly constant, the regeneration temperature is constant, and the heat generated by the regenerator is constant, With the increase of the agent-oil ratio, the heat taken by the external heat extractor gradually increases. This part of the heat is used to generate water vapor and merged into the steam pipe network, and will not return to the regeneration system. The increase of the agent-oil ratio is limited to a certain extent.

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