Natural-circulation self-cleaning evaporation device

Abstract

A natural-circulation self-cleaning evaporation device is disclosed. A steel wire screw is mounted in an uplink heating pipe; a twisted strip screw is mounted in a downlink heating pipe. Fluidization balls are added into a circulation solution to realize high-efficient cleaning by the fluidization balls with a low concentration of 0.1%-3.0% in a spiral fluidization state. A boiling pipe is disposed above a heating chamber, is trumpet-shaped, prevents fluidization ball obstruction by adopting a converged section and a gradually-expanded section, and reduces the circulation resistance and the outlet kinetic energy loss. A shunting skirt is designed at the lower end of a lower pipe plate of the heating chamber. The circulation solution flowing downwards is shunted into a circulation main flow and a circulation auxiliary flow before the shunting skirt; the circulation auxiliary flow flows into and stirs the fluidization balls to form a fluidization state when passing through sieve pores on a sieve plate, which allows the fluidization balls to flow into the uplink heating pipe uniformly and smoothly, so as to realize natural circulation flow of the fluidization balls. The spiral-fluidization self-cleaning evaporation device can not only realize natural circulation, but also realize high-efficient automatic cleaning, is reliable in operation, simple in maintenance, and thus can realize both great yield increase and energy saving.

Description

technical field [0001] The invention relates to a natural circulation self-cleaning evaporating device, which relates to automatic cleaning and anti-scaling and heat transfer enhancement in tubes of a natural circulation tube heating evaporator and a natural circulation tube heating reboiler. It is mainly suitable for natural circulation evaporators and reboilers that are prone to fouling in the heating tubes, especially for tube-and-tube heating evaporators and reboilers whose production capacity and energy consumption are significantly affected by scaling in the heating tubes. Background technique [0002] The natural circulation flow rate of the existing natural circulation evaporator is low, the fouling in the heating tube is fast, and frequent parking and cleaning are required. For this reason, most of them are replaced by forced circulation with high energy consumption. For example, the circulation pump ACP11-900 of a certain salt evaporator is 160Kw (Haihu Salt and Ch...

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Problems solved by technology

Among them, the steel wire spiral technology (for example, the Chinese patent ZL2004200351029 authorized on 2005.02.23., the fluid power plastic-coated spiral line for automatic cleaning in the heat transfer tube) and the plastic twisted belt spiral technology (for example, the heat exchanger self-rotating spiral twisted belt Research on the application of automatic scale inhibition technology, Chemical Engineering, 2006 / 03) The structure is the simplest, but the ability to automatically clean the hard scale in the vertical heating tube of the evaporation device is too weak, the effect is not obvious, and cannot meet the basic requirements of industrial production , and there is no information report on the successful application of large-scale industrial production evaporators

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