Crystallizer for MVR (Mechanical Vapor Recompression) sewage treatment system

Abstract

The invention discloses a crystallizer for an MVR (Mechanical Vapor Recompression) sewage treatment system. According to the crystallizer, the problems that an inlet solution is not uniformly dispersed, a steam outlet channel has small clearance, great resistance drop, easiness in blockage and poor separation effect, as well as a crystalloid in a container easily enters a connected pipeline, so that the service life of a pump in the connected pipeline is shortened in the prior art are solved. The crystallizer is characterized in that guide diverters are welded at an interface positions of theinner wall of a cylinder body and solution inlet pipes; a multichannel folded plate type demisting device is arranged in an upper cone; sprayers on an upper layer and a lower layer are arranged on themultichannel folded plate type demisting device; outlet grids are welded at an solution outlet; multifunctional grids are also arranged in a lower cone. The crystallizer has the beneficial effects that the inlet solution is uniformly distributed, the vapor-liquid separating efficiency of a steam outlet is high, and a crystal mush solution in a salt leg is uniformly distributed, so that vortex formed in the sinking process of the crystal mush solution can be prevented and a crystallizing effect is improved; the crystalloid in the container can be prevented from entering the connected pipelineat the solution outlet, and the service life of a circulating pump in the connected pipeline is prolonged.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment equipment, in particular to a crystallizer used in an MVR sewage treatment system. Background technique [0002] The working principle of MVR (Mechanical Vapor Recompression) is to compress the low-pressure and low-temperature vapor from the evaporator to a higher pressure and temperature through a mechanically driven compressor to become high-temperature steam, which acts as a heater and reboiler And the heat source of the evaporator, recovering the latent heat of vaporization of the secondary steam, thus saving energy consumption. In the MVR sewage treatment system, the crystallizer is the core equipment. The crystallizer in the prior art includes a cylinder, an upper cone, a lower cone, an upper head, an inner cylinder, a liquid inlet pipe, a steam outlet pipe, a solution inlet, a solution Outlet pipe, salt leg and brine outlet, but there are the following problems: [0003] (1) The ...

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Problems solved by technology

[0003] (1) The inlet of the solution adopts a general connection structure, the solution directly enters the container at a relatively fast flow rate, and the solution is unevenly dispersed;

[0004] (2) The wire mesh demister is used at the steam outlet, the channel gap is small, the resistance drop is large, it is easy to block, and the vapor-liquid separation efficiency is low;

[0005] (3) A single-layer spray device is installed at the demister. The spray area can only cover one side of the demister in one direction. The solution will hang slurry or crystallize at the demister, causing the demister to block. Reduce the vapor-liquid separation effect of the demister;

[0006] (4) The solution outlet nozzle installed on the lower cone is directly connected to the connecting pipe, and the crystals in the container are easy to enter the circulation pipe of the heater connected to it, which reduces the service life of the pump in the heater circulation pipe;

[0007] (5) The lower cone is directly connected to the salt leg, and the crystal slurry is unevenly distributed after entering the salt leg; moreover, it is easy to form a vortex inside the salt leg during the sinking process of the crystal slurry solution, and it is easy for large crystals to enter the pipeline; Service life of the pump in the pipeline connected to the slurry outlet

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