High-efficiency evaporation salt production system for refined brine

Abstract

The utility model discloses a refined brine high-efficiency evaporation salt-making production system which comprises a refined brine barrel, a secondary preheater, a non-condensable gas preheater, an MVR (mechanical vapor recompression) hot-pressing evaporation salt-making device, a crystal slurry tank, a cyclone, a centrifugal machine, a drying and packaging system, a primary preheater and a condensed water balance barrel. Secondary steam is fully utilized, steam consumption is reduced, waste heat of the system is fully utilized, and energy consumption of the system is reduced; the MVR hot-pressing evaporation salt-making device is simple in process flow, less in equipment, less in steam consumption and simple and convenient to operate.

Description

Technical field:

[0001] The utility model relates to an evaporation salt-making device, in particular to a refined brine high-efficiency evaporation salt-making production system. Background technology:

[0002] Currently, the salt production industry generally utilizes multi-effect vacuum evaporation, a proven and reliable technology. Domestically, five-effect vacuum evaporation is commonly used. However, with energy shortages and the expansion of production scale, a small number of companies have adopted six-effect vacuum evaporation. However, multi-effect evaporation has certain limitations, including the inability to maximize secondary steam utilization, high steam consumption, and high energy consumption. Utility model content:

[0003] The purpose of the utility model is to provide a low-energy consumption refined brine high-efficiency evaporation salt production system that can fully utilize secondary steam and system waste heat.

[0004] The utility model is implemented by the following technical solutions: a refined brine efficient evaporation salt production system, which includes a refined brine barrel, a secondary preheater, a non-condensable gas preheater, an MVR hot pressure evaporation salt making device, a slurry tank, a cyclone, a centrifuge, a drying and packaging system, a primary preheater and a condensate balance barrel;

[0005] The outlet of the refined brine barrel is connected to the refined brine inlet of the secondary preheater through a pipeline, the refined brine outlet of the secondary preheater is connected to the refined brine inlet of the non-condensable gas preheater through a pipeline, the refined brine outlet of the non-condensable gas preheater is connected to the refined brine inlet of the MVR hot-pressure evaporation salt-making device, the slurry outlet of the MVR hot-pressure evaporation salt-making device is connected to the inlet of the slurry tank through a pipeline, the outlet of the slurry tank is connected to the inlet of the slurry pump, the outlet of the slurry pump is connected to the inlet of the cyclone, the thick material outlet of the cyclone is connected to the inlet of the centrifuge, the wet salt outlet of the centrifuge is placed above the feeding end of the conveyor belt, and the discharging end of the conveyor belt is placed above the inlet of the drying and packaging system;

[0006] The non-condensable gas outlet of the MVR hot-pressure evaporation salt-making device is connected to the non-condensable gas inlet of the non-condensable gas preheater through a pipeline, and the non-condensable gas outlet of the non-condensable gas preheater is connected to the emptying pipeline; the condensate outlet of the non-condensable gas preheater is connected to the inlet of the condensate balancing barrel; the outlet of the condensate balancing barrel is connected to the inlet of the condensate pump, and the outlet of the condensate pump is respectively connected to the condensate inlet of the secondary preheater and the condensate inlet of the primary preheater, the condensate outlet of the secondary preheater is connected to the condensate inlet of the primary preheater, and the condensate outlet of the primary preheater is connected to the condensate external discharge pipeline; the outlet of the refined brine barrel is connected to the inlet of the washing brine pump, the outlet of the washing brine pump is connected to the washing brine inlet of the primary preheater, the washing brine outlet of the primary preheater is connected to the washing water inlet of the salt foot of the evaporation chamber of the MVR hot-pressure evaporation salt-making device; the condensate outlet of the MVR hot-pressure evaporation salt-making device is connected to the inlet of the condensate balancing barrel. One refined brine is first heated by heat exchange with condensate from the MVR hot-pressure evaporation salt production unit in a secondary preheater. It then heat exchanges with non-condensable gas from the MVR hot-pressure evaporation salt production unit in a non-condensable gas preheater before being fed into the MVR hot-pressure evaporation salt production unit for crystallization. The other refined brine is then heated by heat exchange with condensate from the primary preheater and condensate from the MVR hot-pressure evaporation salt production unit in a secondary preheater. It is then fed into the evaporation chamber of the MVR hot-pressure evaporation salt production unit, where it serves as the washing brine to wash and cool the crystal slurry. After washing and cooling, the slurry passes through a slurry tank, a slurry pump, a cyclone for thickening, a centrifuge for separation, and a drying and packaging system to produce finished salt. The condensate from the secondary preheater is discharged. The non-condensable gas is cooled by heat exchange with the refined brine in the non-condensable gas preheater before being discharged.

[0007] Specifically, the MVR hot-pressure evaporation salt-making device includes a scrubbing tower, a steam compressor and four groups of MVR hot-pressure evaporation salt-making units running in parallel. The MVR hot-pressure evaporation salt-making units include a heating chamber, a circulation pump and an evaporation chamber. The circulating liquid outlet of the heating chamber is connected to the circulating liquid inlet of the evaporation chamber, the circulating liquid outlet of the evaporation chamber is connected to the inlet of the circulation pump, and the outlet of the circulation pump is connected to the circulating liquid inlet of the heating chamber; the refined brine outlet of the non-condensable gas preheater is respectively connected to the circulating liquid inlet of the heating chamber of each MVR hot-pressure evaporation salt-making unit through a pipeline; the secondary steam outlet of the evaporation chamber of each MVR hot-pressure evaporation salt-making unit is connected to the steam inlet of the scrubbing tower through a pipeline; the steam outlet of the scrubbing tower is connected to the steam inlet of the steam compressor, and the steam outlet of the steam compressor is connected to the steam inlet of the steam compressor. The outlet is connected to the steam inlet of the heating chamber of each MVR hot-pressure evaporation salt production unit. The condensate outlet of each heating chamber is connected to the inlet of the condensate balance tank. The secondary steam evaporated from each evaporation chamber is collected and enters the scrubber. The scrubbed secondary steam enters the steam compressor, where its temperature and pressure are increased. The heated saturated steam enters the shell side of each effect heating chamber, where it exchanges heat with the feed liquid in the tube side. The condensate after heat exchange enters the condensate balance tank and is pumped by a condensate pump to the primary and secondary preheaters, where it serves as a heat source for the preheaters. After fully utilizing its thermal energy, it is discharged out of the boundary area, fully utilizing the secondary steam, reducing steam consumption, and fully utilizing the system's waste heat, thereby reducing system energy consumption. The non-condensable gas outlet of each MVR hot-pressure evaporation salt production unit's heating chamber is connected to the non-condensable gas inlet of the non-condensable gas preheater via a pipeline. The non-condensable steam discharged from the heating chamber is used to preheat the raw refined brine, recycling the waste heat of the non-condensable gas and fully utilizing the system's thermal energy. The slurry outlet of the evaporation chamber of each MVR hot-pressure evaporation salt-making unit is connected to the inlet of the slurry tank through a pipeline; the washing brine outlet of the first-level preheater is respectively connected to the washing water inlet of the salt foot of the evaporation chamber of each MVR hot-pressure evaporation salt-making unit.

[0008] Advantages of this utility model:

[0009] The utility model makes full use of secondary steam to reduce steam consumption, and at the same time makes full use of system waste heat to reduce system energy consumption. The utility model adopts MVR hot pressure evaporation salt making device, which has simple process flow, less equipment, low steam consumption and easy operation. Description of the drawings:

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 This is a connection diagram of the refined brine efficient evaporation salt production system.

[0012] Refined brine barrel 1, secondary preheater 2, non-condensable gas preheater 3, slurry tank 4, cyclone 5, centrifuge 6, drying and packaging system 7, primary preheater 8, condensate balance barrel 9, scrubbing tower 10, steam compressor 11, heating chamber 12, circulation pump 13, evaporation chamber 14, slurry pump 15, condensate pump 17, and washing brine pump 18. Specific implementation method:

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0014] A highly efficient evaporation salt production system for refined brine comprises a refined brine barrel 1, a secondary preheater 2, a non-condensable gas preheater 3, an MVR hot-pressure evaporation salt-making device, a slurry tank 4, a cyclone 5, a centrifuge 6, a drying and packaging system 7, a primary preheater 8 and a condensate balance barrel 9; the MVR hot-pressure evaporation salt-making device comprises a scrubbing tower 10, a steam compressor 11 and four sets of MVR hot-pressure evaporation salt-making units operating in parallel, the MVR hot-pressure evaporation salt-making units comprising a heating chamber 12, a circulating pump 13 and an evaporation chamber 14, the circulating liquid outlet of the heating chamber 12 is connected to the circulating liquid inlet of the evaporation chamber 14, the circulating liquid outlet of the evaporation chamber 14 is connected to the inlet of the circulating pump 13, and the outlet of the circulating pump 13 is connected to the circulating liquid inlet of the heating chamber 12;

[0015] The outlet of the refined brine barrel 1 is connected to the refined brine inlet of the secondary preheater 2 through a pipeline, the refined brine outlet of the secondary preheater 2 is connected to the refined brine inlet of the non-condensable gas preheater 3 through a pipeline, and the refined brine outlet of the non-condensable gas preheater 3 is respectively connected to the circulating liquid inlet of the heating chamber 12 of each MVR hot-pressure evaporation salt-making unit through a pipeline; the slurry outlet of the evaporation chamber 14 of each MVR hot-pressure evaporation salt-making unit is connected to the inlet of the slurry tank 4 through a pipeline, the outlet of the slurry tank 4 is connected to the inlet of the slurry pump 15, the outlet of the slurry pump 15 is connected to the inlet of the cyclone 5, the thick material outlet of the cyclone 5 is connected to the inlet of the centrifuge 6, the wet salt outlet of the centrifuge 6 is placed above the feeding end of the conveyor belt, and the discharging end of the conveyor belt is placed above the inlet of the drying and packaging system 7;

[0016] The non-condensable gas outlet of the heating chamber 12 of each MVR hot-pressure evaporation salt-making unit is connected to the non-condensable gas inlet of the non-condensable gas preheater 3 through a pipeline, and the non-condensable gas outlet of the non-condensable gas preheater 3 is connected to the exhaust pipeline; the condensed water outlet of the non-condensable gas preheater 3 is connected to the inlet of the condensed water balance barrel 9; the non-condensable steam discharged from the heating chamber 12 is used to preheat the raw material refined brine, and the waste heat of the non-condensable gas is recycled and utilized, so as to make full use of the system thermal energy.

[0017] The outlet of the condensed water balancing barrel 9 is connected to the inlet of the condensed water pump 17, and the outlet of the condensed water pump 17 is connected to the condensed water inlet of the secondary preheater 2 and the condensed water inlet of the primary preheater 8 respectively, the condensed water outlet of the secondary preheater 2 is connected to the condensed water inlet of the primary preheater 8, and the condensed water outlet of the primary preheater 8 is connected to the condensed water external discharge pipeline; the outlet of the refined brine barrel 1 is connected to the inlet of the washing brine pump 18, and the outlet of the washing brine pump 18 is connected to the washing brine inlet of the primary preheater 8, and the The elution brine outlet of heater 8 is connected to the elution water inlet of the salt foot of the evaporation chamber of each MVR hot-pressure evaporation salt-making unit. The condensate outlet of heating chamber 12 of each MVR hot-pressure evaporation salt-making unit is connected to the inlet of condensate balancing tank 9. One stream of refined brine is first heated by heat exchange with condensate from condensate balancing tank 9 in secondary preheater 2, then heat exchanged with non-condensable gas from heating chamber 12 in non-condensable gas preheater 3 before being fed into heating chamber 12 for crystallization in the MVR hot-pressure evaporation salt-making unit. Another stream of refined brine is then heated by heat exchange with condensate discharged from secondary preheater 2 and condensate from condensate balancing tank 9 in primary preheater 8 before being fed into the salt foot of the evaporation chamber of the MVR hot-pressure evaporation salt-making unit. It serves as elution brine to wash and cool the crystal slurry. Elutriation of the salt foot separates fine salt from coarse salt, ensuring the size of the salt crystals. It also lowers the temperature of the discharged crystal slurry, reduces heat loss, and improves the operating environment. After washing and cooling, the slurry passes through a slurry tank 4, a slurry pump 15, a cyclone 5 for thickening, a centrifuge 6 for separation, and a drying and packaging system 7 to produce finished salt. Condensate from the primary preheater 8 is discharged. Non-condensable gases are cooled by heat exchange with refined brine in a non-condensable gas preheater 3 before being discharged.

[0018] The secondary steam outlet of the evaporation chamber 14 of each MVR hot-pressure evaporation salt-making unit is connected to the steam inlet of the scrubbing tower 10 through a pipeline; the steam outlet of the scrubbing tower 10 is connected to the steam inlet of the steam compressor 11, and the steam outlet of the steam compressor 11 is respectively connected to the steam inlet of the heating chamber 12 of each MVR hot-pressure evaporation salt-making unit. The secondary steam evaporated from each evaporation chamber 14 is collected and enters the scrubbing tower 10. The washed secondary steam enters the scrubbing tower 11, and its temperature and pressure are increased under the action of the scrubbing tower 11. The heated saturated steam enters the shell side of each effective heating chamber 12 and exchanges heat with the feed liquid in the tube side. The condensed water after heat exchange enters the condensate balancing barrel 9 and is transported to the first-level preheater 8 and the second-level preheater 2 through the condensate pump 17 as the heat source of the preheater. After fully utilizing its thermal energy, it is sent out of the boundary area, fully utilizing the secondary steam, reducing steam consumption, and at the same time fully utilizing the system waste heat to reduce system energy consumption.

[0019] In this embodiment, the secondary preheater 2 is a condensate preheater; the secondary preheater 8 is a shell and tube preheater;

[0020] The main equipment specifications and technical parameters selected in this embodiment are shown in Table 1:

[0021] Table 1: List of main equipment:

[0022]

[0023]

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The highly efficient evaporation salt production system for refined brine is characterized by: It includes brine barrel, secondary preheater, non-condensable gas preheater, MVR hot pressure evaporation salt making device, slurry tank, cyclone, centrifuge, drying and packaging system, primary preheater and condensate balance barrel; The outlet of the refined brine barrel is connected to the refined brine inlet of the secondary preheater through a pipeline, the refined brine outlet of the secondary preheater is connected to the refined brine inlet of the non-condensable gas preheater through a pipeline, the refined brine outlet of the non-condensable gas preheater is connected to the refined brine inlet of the MVR hot-pressure evaporation salt-making device, the slurry outlet of the MVR hot-pressure evaporation salt-making device is connected to the inlet of the slurry tank through a pipeline, the outlet of the slurry tank is connected to the inlet of the slurry pump, the outlet of the slurry pump is connected to the inlet of the cyclone, the thick material outlet of the cyclone is connected to the inlet of the centrifuge, the wet salt outlet of the centrifuge is placed above the feeding end of the conveyor belt, and the discharging end of the conveyor belt is placed above the inlet of the drying and packaging system; The non-condensable gas outlet of the MVR hot-pressure evaporation salt-making device is connected to the non-condensable gas inlet of the non-condensable gas preheater through a pipeline, and the non-condensable gas outlet of the non-condensable gas preheater is connected to the emptying pipeline; the condensate outlet of the non-condensable gas preheater is connected to the inlet of the condensate balancing barrel; the outlet of the condensate balancing barrel is connected to the inlet of the condensate pump, the outlet of the condensate pump is connected to the condensate inlet of the secondary preheater, the condensate outlet of the secondary preheater is connected to the condensate inlet of the first preheater, and the condensate outlet of the first preheater is connected to the condensate external discharge pipeline; the outlet of the refined brine barrel is connected to the inlet of the washing brine pump, the outlet of the washing brine pump is connected to the washing brine inlet of the first preheater, and the washing brine outlet of the first preheater is connected to the washing water inlet of the salt foot of the evaporation chamber of the MVR hot-pressure evaporation salt-making device; the condensate outlet of the MVR hot-pressure evaporation salt-making device is connected to the inlet of the condensate balancing barrel.

2. The refined brine efficient evaporation salt production system according to claim 1 is characterized in that: The MVR hot-pressure evaporation salt-making device includes a scrubbing tower, a steam compressor and four groups of MVR hot-pressure evaporation salt-making units running in parallel. The MVR hot-pressure evaporation salt-making units include a heating chamber, a circulation pump and an evaporation chamber. The circulating liquid outlet of the heating chamber is connected to the circulating liquid inlet of the evaporation chamber, the circulating liquid outlet of the evaporation chamber is connected to the inlet of the circulation pump, and the outlet of the circulation pump is connected to the circulating liquid inlet of the heating chamber; the refined brine outlet of the non-condensable gas preheater is respectively connected to the circulating liquid inlet of the heating chamber of each MVR hot-pressure evaporation salt-making unit through a pipeline; the secondary steam outlet of the evaporation chamber of each MVR hot-pressure evaporation salt-making unit is connected to the steam inlet of the scrubbing tower through a pipeline; the The steam outlet is connected to the steam inlet of the steam compressor, and the steam outlet of the steam compressor is respectively connected to the steam inlet of the heating chamber of each MVR hot-pressure evaporation salt-making unit, and the condensate outlet of the heating chamber of each MVR hot-pressure evaporation salt-making unit is connected to the inlet of the condensate balance barrel; the non-condensable gas outlet of the heating chamber of each MVR hot-pressure evaporation salt-making unit is connected to the non-condensable gas inlet of the non-condensable gas preheater through a pipeline; the slurry outlet of the evaporation chamber of each MVR hot-pressure evaporation salt-making unit is connected to the inlet of the slurry tank through a pipeline; the washing brine outlet of the first-level preheater is respectively connected to the washing water inlet of the salt foot of the evaporation chamber of each MVR hot-pressure evaporation salt-making unit.

Images