CN205216256U - Falling liquid film and MVR forced circulation evaporation crystal system - Google Patents

Abstract

The utility model discloses a falling liquid film and MVR forced circulation evaporation crystal system, including head tank, falling film evaporation crystal system and MVR forced circulation evaporation crystal system, the utility model discloses the equitable combination of falling film evaporation and MVR forced circulation evaporation together, gather the advantages of two kinds of evaporation crystal systems, it is applicable to composition complicacy, easy crystallization, viscosity is high, concentration is low, including the evaporation crystallization process of the mixed waste liquid of infusibility solidity thing to in can being applicable to the great extensive industrial production of handling capacity, it is rational in infrastructure, and the energy consumption is low, compact structure, and area is little, can carry out crystallization production in succession, and throughput is great.

Description

Falling film and MVR forced circulation evaporation crystallization system

technical field

The utility model relates to the technical field of evaporation crystallization equipment, in particular to a falling film and MVR forced circulation evaporation crystallization system.

Background technique

In the industrial production of chemical industry, light industry, food, medicine, etc., the concentration and solute separation of the mixed solution composed of non-volatile solute and volatile solvent are often encountered. Evaporation crystallizer is a common equipment used here. When working, the material is boiled by inputting heat, the solvent is evaporated from the mixed solution, the solvent is separated from the solute, and the supersaturated solute crystallizes into a solid, which can then be passed through centrifugation. or other methods to separate the solute.

Due to the different characteristics of the mixed liquid that needs to be evaporated and crystallized in different production fields, the structure and working principle of the evaporative crystallizer used in each production field are also different. In the wastewater treatment industry in the fields of printing and dyeing, fermentation, chemical industry, oil field, etc., the mixed waste liquid to be treated usually has the characteristics of complex composition, easy crystallization, high viscosity, low concentration, and insoluble solids, and often requires a very large amount of treatment. Big. However, there is no evaporative crystallization device for this in the prior art.

Contents of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art and provide a falling film and MVR forced circulation evaporation crystallization system, which is suitable for complex components, easy crystallization, high viscosity, low concentration, and insoluble solids Evaporation and crystallization of the mixed waste liquid of waste.

The utility model is realized through the following technical solutions: a falling film and MVR forced circulation evaporation crystallization system, including a raw material tank, a falling film evaporation crystallization system and an MVR forced circulation evaporation crystallization system, the falling film evaporation crystallization system includes a falling film evaporation crystallization system An evaporation heater and a separator, the falling film evaporation heater includes an evaporation chamber and a gas-liquid separation chamber arranged below the evaporation chamber, the gas-liquid separation chamber is connected to the separator through a pipe fitting, and the raw material tank is connected to the separator through a feed pump And the pipeline is connected with the feed port at the upper end of the evaporation chamber of the falling film evaporation heater, the MVR forced circulation evaporation crystallization system includes a forced circulation evaporation heater, a forced circulation pump and a crystallizer, and the forced circulation evaporation heater The upper outlet of the crystallizer is connected to the upper feed port of the crystallizer through a pipeline, and the return port of the lower part of the crystallizer is fed to the lower end of the forced circulation evaporation heater through a pipeline and the forced circulation pump. The discharge port at the lower end of the gas-liquid separation chamber of the falling film evaporation heater and the discharge port at the lower end of the separator pass through the pipeline and the pipe connected to the feed port of the forced circulation pump and the transfer pump. The outlet of the crystal slurry at the bottom of the crystallizer is connected with the slurry pump through a pipeline.

The steam outlet at the upper end of the separator of the falling film evaporation crystallization system, the steam outlet at the upper end of the crystallizer of the MVR forced circulation evaporation crystallization system pass through the pipeline and steam compressor and the shell side steam of the forced circulation evaporation heater The inlet is connected to the steam inlet of the shell side of the falling film evaporation heater.

It also includes a heat recovery heat exchange system, the heat recovery heat exchange system includes a condensed water tank and a plate heat exchanger, the condensed water outlet of the shell side of the forced circulation evaporation heater, the shell side of the falling film evaporation heater The condensed water outlet is connected to the liquid inlet at the upper end of the condensed water tank through a pipeline, and the steam outlet at the upper end of the condensed water tank is connected to the steam inlet of the shell side of the falling film evaporation heater, and the condensed water tank The condensed water outlet at the lower end is connected to the inlet of the shell side of the plate heat exchanger through a pipeline and a condensed water pump, the outlet of the shell side of the plate heat exchanger is connected to a condensed water drain pipe, and the tube side of the plate heat exchanger It is connected between the feed pump and the feed port at the upper end of the evaporation chamber of the falling film evaporation heater.

The heat recovery heat exchange system also includes a tubular heat exchanger, and the vacuum port of the shell side of the falling film evaporation heater is connected with the air inlet of the shell side of the tubular heat exchanger through a pipeline, so The exhaust port of the shell side of the tube heat exchanger is connected to the vacuum pump through a pipeline, and the tube side of the tube heat exchanger is connected to the feed pump of the feed pump and the tube side of the plate heat exchanger. between mouths.

The beneficial effects of the utility model are: the utility model rationally combines falling film evaporation and MVR forced circulation evaporation together, and integrates the advantages of the two evaporation crystallization systems, which is suitable for complex components, easy crystallization, high viscosity, low concentration, containing Evaporation and crystallization treatment of mixed waste liquid of insoluble solids, and can be applied to large-scale industrial production with large processing capacity. It has reasonable structure, low energy consumption, compact structure, small footprint, and continuous crystallization production. Large processing capacity.

Description of drawings

Fig. 1 is a structural representation of the utility model.

In the figure: 1-raw material tank; 2-feed pump; 3-tube heat exchanger; 4-vacuum pump; 5-plate heat exchanger; 6-condensate pump; 7-condensate tank; 8-circulation pump; 9-falling film evaporation heater; 10-separator; 11-transfer pump; 12-forced circulation evaporation heater; 13-forced circulation pump; 14-crystallizer; 15-steam compressor; 16-magnet slurry pump.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in detail.

As shown in Figure 1, a kind of falling film and MVR forced circulation evaporation crystallization system comprises raw material tank 1, falling film evaporation crystallization system and MVR forced circulation evaporation crystallization system, falling film evaporation crystallization system comprises falling film evaporation heater 9 and separation 10, the falling film evaporation heater 9 includes an evaporation chamber and a gas-liquid separation chamber arranged below the evaporation chamber. The gas-liquid separation chamber is connected to the separator 10 through a pipe fitting, and the raw material tank 1 is connected to the falling film through the feed pump 2 and the pipeline. The feed port at the upper end of the evaporation chamber of the evaporation heater 9 is connected. The MVR forced circulation evaporation crystallization system includes a forced circulation evaporation heater 12, a forced circulation pump 13 and a crystallizer 14. The upper end outlet of the forced circulation evaporation heater 12 passes through the pipe The road is connected with the upper feed port of the crystallizer 14, and the return port of the lower part of the crystallizer 14 is connected with the lower end feed port of the forced circulation evaporation heater 12 through the pipeline and the forced circulation pump 13, and the gas of the falling film evaporation heater 9 The discharge port at the lower end of the liquid separation chamber and the discharge port at the lower end of the separator 10 are connected through the pipeline and the pipeline connected with the feeding port of the forced circulation pump 13 through the pipeline and the transfer pump 11, and the outlet of the crystal slurry at the bottom of the crystallizer 14 is passed through The pipeline is connected with the slurry pump 16. The gas-liquid separation chamber of the falling film evaporation heater 9 is connected with the evaporation chamber of the falling film evaporation heater 9 through a pipeline and a circulation pump 8 .

When working, the falling film evaporation crystallization system is used in the front stage for primary reduction, and the evaporation is close to saturation, and the MVR forced circulation evaporation crystallization system is used in the latter stage to crystallize and generate solids. Afterwards, it is output by the crystal slurry pump 16, and the crystal is centrifuged out by centrifugation, and the centrifuged mother liquor returns to the MVR forced circulation evaporation crystallization system to continue evaporation and concentration to achieve "zero discharge" of the mother liquor.

Referring to Fig. 1, the steam outlet at the upper end of the separator 10 of the falling film evaporation crystallization system, and the steam outlet at the upper end of the crystallizer 14 of the MVR forced circulation evaporation crystallization system pass through the pipeline and the shell side of the steam compressor 15 and the forced circulation evaporation heater 12 The steam inlet and the steam inlet of the shell side of the falling film evaporation heater 9 are connected. The secondary steam produced by the evaporation of the material liquid enters the steam compressor 15 from the discharge to be compressed and pressurized, and the temperature is raised to increase the heat enthalpy of the secondary steam, and then enters the shell side of the forced circulation evaporation heater 12 and the shell of the falling film evaporation heater 9 The heat release and condensation in the process make the energy be used rationally and make the equipment more energy-saving.

The utility model also includes a heat recovery heat exchange system. The heat recovery heat exchange system includes a condensed water tank 7 and a plate heat exchanger 5, the condensed water outlet of the shell side of the forced circulation evaporation heater 12, and the shell of the falling film evaporation heater 9. The outlet of the condensed water on the side is connected to the liquid inlet on the upper end of the condensed water tank 7 through a pipeline, the steam outlet on the upper end of the condensed water tank 7 is connected to the steam inlet on the shell side of the falling film evaporation heater 9, and the condensed water at the lower end of the condensed water tank 7 The water outlet is connected to the inlet of the shell side of the plate heat exchanger 5 through the pipeline and the condensate pump 6, the outlet of the shell side of the plate heat exchanger 5 is connected to the condensate drain pipe, and the tube side of the plate heat exchanger 5 is connected to the feed pump 2 and the feed port at the upper end of the evaporation chamber of the falling film evaporation heater 9. During the working process, the condensed water released from the shell side of the forced circulation evaporating heater 12 and the shell side of the falling film evaporating heater 9 also has a certain temperature, and the condensed water is used to preheat the feed liquid to make rational use of energy.

The heat recovery heat exchange system also includes a tubular heat exchanger 3, the vacuum port of the shell side of the falling film evaporation heater 9 is connected to the air inlet of the shell side of the tubular heat exchanger 3 through a pipeline, and the tubular heat exchange The exhaust port of the shell side of the device 3 is connected to the vacuum pump 4 through a pipeline, and the tube side of the tube heat exchanger 3 is connected between the feed pump 2 and the feed port of the tube side of the plate heat exchanger 5 . The air extracted from the shell side of the falling film evaporation heater 9 has a certain temperature, and the extracted air exchanges heat with the feed liquid through the tubular heat exchanger 3 to heat the feed liquid in advance, which is more energy-saving and environmentally friendly.

Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the scope of protection of the utility model. Simple modifications or equivalent replacements to the technical solution of the utility model by those skilled in the art are all acceptable. Do not depart from the essence and scope of the technical solution of the utility model.

Claims (4)

1. a falling liquid film and MVR forced-circulation evaporation crystal system, it is characterized in that: described falling liquid film and MVR forced-circulation evaporation crystal system comprise head tank, falling film evaporation crystal system and MVR forced-circulation evaporation crystal system, described falling film evaporation crystal system comprises falling film evaporation heating and separator, described falling film evaporation heating comprises vaporization chamber and is arranged at the gas-liquid separation chamber below vaporization chamber, gas-liquid separation chamber is connected with described separator by pipe fitting, described head tank is connected with the charging aperture of the vaporization chamber upper end of described falling film evaporation heating by feed pump and pipeline, described MVR forced-circulation evaporation crystal system comprises forced-circulation evaporation heater, forced circulation pump and crystallizer, the upper end discharging opening of described forced-circulation evaporation heater is connected by the upper feed inlet of pipeline with described crystallizer, the refluxing opening of the bottom of described crystallizer is connected with the lower end charging aperture of described forced-circulation evaporation heater by pipeline and described forced circulation pump, the discharging opening of the gas-liquid separation chamber lower end of described falling film evaporation heating and the discharging opening of described separator lower end are connected with the pipeline that the charging aperture of described forced circulation pump is connected by pipeline and transfering material pump, the magma outlet of the bottom of described crystallizer is connected with magma pump by pipeline.

2. falling liquid film according to claim 1 and MVR forced-circulation evaporation crystal system, is characterized in that: the steam (vapor) outlet of the steam (vapor) outlet of the separator upper end of described falling film evaporation crystal system, the crystallizer upper end of described MVR forced-circulation evaporation crystal system is connected with the steam inlet of the steam inlet of the shell side of described forced-circulation evaporation heater, the shell side of described falling film evaporation heating by pipeline and vapour compression machine.

3. falling liquid film according to claim 2 and MVR forced-circulation evaporation crystal system, it is characterized in that: also comprise heat recovery heat-exchange system, described heat recovery heat-exchange system comprises condensate water pot and plate type heat exchanger, the condensation-water drain of the shell side of described forced-circulation evaporation heater, the condensation-water drain of the shell side of described falling film evaporation heating is connected by the inlet of pipeline with described condensate water pot upper end, the steam (vapor) outlet of described condensate water pot upper end is connected with the steam inlet of the shell side of described falling film evaporation heating, the condensation-water drain of described condensate water pot lower end is connected with the entrance of described plate type heat exchanger shell side by pipeline and condensate pump, the outlet of described plate type heat exchanger shell side is connected with condensate draining pipe, the tube side of described plate type heat exchanger is connected between the charging aperture of vaporization chamber upper end of described feed pump and described falling film evaporation heating.

4. falling liquid film according to claim 3 and MVR forced-circulation evaporation crystal system, it is characterized in that: described heat recovery heat-exchange system also comprises pipe heat exchanger, the vacuum orifice of the shell side of described falling film evaporation heating is connected by the air inlet of pipeline with the shell side of described pipe heat exchanger, the exhaust outlet of the shell side of described pipe heat exchanger is connected with vavuum pump by pipeline, and the tube side of described pipe heat exchanger is connected between the charging aperture of the tube side of described feed pump and described plate type heat exchanger.