CN216320008U - Evaporator discharging system - Google Patents

Abstract

The utility model discloses an evaporator discharging system, which comprises a crystallization separator, a forced circulation heat exchanger, a forced circulation pump, a discharging pump, a cyclone station, a thickener, a centrifugal machine and a mother liquor pool, wherein the forced circulation heat exchanger, the crystallization separator and the forced circulation pump are connected into a circulation loop through circulation pipelines in sequence; the discharge port of the crystallization separator is connected with the feed inlet of the discharge pump, the discharge port of the discharge pump is connected with the feed inlet of the cyclone station, the top outlet of the cyclone station is connected with the reflux port of the crystallization separator, the bottom outlet of the cyclone station is connected with the feed inlet of the thickener, the outlet of the thickener is connected with the inlet of the centrifugal machine, the liquid outlet of the centrifugal machine is connected with the mother liquid pool, and the mother liquid pool is connected to the circulating pipeline. According to the utility model, the concentration is carried out through the cyclone station, so that the salt slurry entering the thickener can be ensured to be at a higher concentration level, and the less blockage and high efficiency of the discharging of the evaporator are effectively realized; the discharge pump can realize seamless switching of double-path feeding, and has stronger adaptability to different material properties.

Description

Evaporator discharging system

Technical Field

The utility model relates to the technical field of evaporators, in particular to an evaporator discharging system.

Background

Evaporation is one of modern chemical unit operations, i.e. a method of heating to vaporize and remove part of the solvent in the solution, so as to increase the concentration of the solution or create conditions for solute precipitation. The evaporative desalination method is a method for removing inorganic salts in waste liquid by using a concentration crystallization system in an evaporative manner, and is widely applied to industries such as industrial production, wastewater treatment, pharmacy, petrochemical industry and the like.

During the evaporation of the materials in the crystallization separator, fresh materials need to be supplemented continuously, and because steam generated by evaporation is condensed in the forced circulator and discharged in the form of condensed water, the solid content in the crystallization separator rises continuously and needs to be discharged periodically or continuously. The existing evaporator discharging system is easy to generate blockage phenomenon in the crystallization discharging process, and the production efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model provides an evaporator discharging system for overcoming the problems in the prior art.

In order to achieve the purpose, the utility model adopts the following technical scheme:

an evaporator discharging system comprises a crystallization separator provided with a material inlet, a forced circulation heat exchanger, a forced circulation pump, a discharging pump, a cyclone station, a thickener, a centrifugal machine and a mother liquor pool, wherein the forced circulation heat exchanger, the crystallization separator and the forced circulation pump are sequentially connected into a circulation loop through circulation pipelines, and secondary steam generated by the crystallization separator enters the forced circulation heat exchanger after being heated by a compressor; the discharge gate of crystal separator passes through the feed inlet of tube coupling discharge pump, the discharge gate of discharge pump passes through the feed inlet of tube coupling whirl station, the backward flow mouth of tube coupling crystal separator is passed through in the top export of whirl station, and the feed inlet of tube coupling stiff ware is passed through in the bottom export of whirl station, stiff ware exit linkage centrifuge entry, mother liquor pond is connected to centrifuge's liquid outlet, mother liquor pond passes through tube coupling to circulating line.

Preferably, the crystallization separator is provided with two discharge ports, namely a first discharge port positioned at the middle lower part of the crystallization separator and a second discharge port positioned at the bottom of the salt leg of the crystallization separator, and the first discharge port and the second discharge port are respectively connected with a discharge pump through pipelines.

Preferably, the thickener is provided with an overflow port, and the overflow port is connected with the mother liquor pool through a pipeline.

Preferably, a stirrer is arranged in the thickener, and the stirrer is connected with a torque sensor for monitoring the salt solid content in the thickener in real time.

Preferably, a mother liquor reflux pump is arranged on a pipeline of the mother liquor pool connecting with the circulating pipeline.

Preferably, a pump discharging adjusting valve used for adjusting discharging of the discharging pump is arranged on a pipeline connected with a discharging port of the discharging pump.

Preferably, a first discharge regulating valve used for regulating the discharge of the crystallization separator is arranged on a pipeline connecting the discharge pump and the first discharge port, and a second discharge regulating valve used for regulating the discharge of the crystallization separator is arranged on a pipeline connecting the discharge pump and the second discharge port.

Compared with the prior art, the utility model carries out concentration by the cyclone station, can ensure that the salt slurry entering the thickener is at a higher concentration level, and effectively realizes less blockage and high efficiency of the discharging of the evaporator; the discharge pump can realize seamless switching of double-path feeding, and has stronger adaptability to different material properties.

Drawings

FIG. 1 is a schematic diagram of an evaporator discharge system according to the present invention.

In the figure, 1-forced circulation heat exchanger, 2-crystallization separator, 3-discharge pump, 4-cyclone station, 5-thickener, 6-centrifuge, 7-mother liquor pool, 8-mother liquor reflux pump and 9-forced circulation pump.

Detailed Description

The utility model is described in further detail below with reference to specific embodiments and the attached drawing figures. Those skilled in the art will be able to implement the utility model based on these teachings. Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., and "several" means one or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Unless otherwise specified, the raw materials used in the examples of the present invention are all commercially available or available to those skilled in the art; unless otherwise specified, the methods used in the examples of the present invention are all those known to those skilled in the art.

As shown in fig. 1, an evaporator discharging system comprises a forced circulation heat exchanger 1, a crystallization separator 2, a forced circulation pump 9, a discharging pump 3, a cyclone station 4, a thickener 5, a centrifuge 6 and a mother liquor pool 7, wherein the forced circulation heat exchanger 1, the crystallization separator 2 and the forced circulation pump 9 are connected in sequence through a circulation pipeline to form a circulation loop; the discharge gate of crystal separator 2 passes through the feed inlet of tube coupling discharge pump 3, the discharge gate of discharge pump 3 passes through the feed inlet of tube coupling whirl station 4, the top export of whirl station 4 passes through the backward flow mouth of tube coupling crystal separator 2, and the bottom export of whirl station 4 passes through the feed inlet of tube coupling stiff ware 5, the entry of 5 exit linkage centrifuger of stiff ware, mother liquor pond 7 is connected to centrifuge 6's liquid outlet, mother liquor pond 7 is through tube coupling to circulating line.

The forced circulation heat exchanger 1 is provided with a circulation inlet positioned at the bottom, a circulation outlet positioned at the top, a steam inlet for the steam of the compressor to enter, a non-condensable gas outlet and a condensed water outlet; the crystallization separator 2 is provided with a material inlet, a secondary steam outlet, a circulating inlet, a circulating outlet and a discharge hole for material entering; the forced circulation pump 9 is connected to the circulation line between the circulation inlet of the forced circulation heat exchanger 1 and the circulation outlet of the crystal separator 2. The material refers to fresh material which is not circulated, and can be industrial wastewater with high salt content and the like.

The forced circulation heat exchanger 1 heats the circulating material, the material enters the crystallization separator 2 to be evaporated, the secondary steam generated after evaporation is discharged from a secondary steam outlet of the crystallization separator 2 and then enters the compressor, the heated material enters the forced circulation heat exchanger 1 again, the steam after heat exchange is condensed into condensed water, the condensed water is discharged from a condensed water outlet, and the non-condensable gas is discharged from a non-condensable gas outlet.

The crystallization separator 2 can be provided with two discharge ports, namely a first discharge port positioned at the middle lower part of the crystallization separator 2 and a second discharge port positioned at the bottom of the salt leg of the crystallization separator 2, wherein the first discharge port and the second discharge port are respectively connected with the discharge pump 3 through pipelines. So, the seamless switching of double-circuit feeding can be realized to discharge pump 3, and the adaptability to different material properties is stronger. The material with poor precipitation performance is discharged from the middle part of the crystallization separator 2; the material sedimentation performance is better, discharges from salt leg bottom, avoids salt leg to be stifled dead.

In order to effectively adjust the material amount at the inlet and the outlet of the discharge pump 3, a pump material outlet adjusting valve for adjusting the material outlet of the discharge pump 3 can be arranged on a pipeline connected with the discharge port of the discharge pump 3, a first material outlet adjusting valve for adjusting the material outlet of the middle lower part of the crystal separator 2 can be arranged on a pipeline connected with the first discharge port of the discharge pump 3, and a second material outlet adjusting valve for adjusting the material outlet of the bottom of the salt leg of the crystal separator 2 is arranged on a pipeline connected with the second discharge port of the discharge pump 3.

The discharging pump 3 pumps the materials in the crystallization separator 2 to the cyclone station 4, the cyclone station 4 performs cyclone separation, large-particle salt particles enter the thickener 4 from the bottom flow, and small-particle salt solution with low concentration flows back to the crystallization separator 2 from the top flow. The brine with lower concentration of top flow in the cyclone station 4 directly returns to the crystallization separator, so that the conventional process that the brine overflows into the mother liquor pool 7 and then returns to the crystallization separator by a pump is omitted, the power consumption is reduced, and the control difficulty is reduced.

The underflow of the cyclone station 4 can only account for less than 25% of the incoming flow, which means that the discharge pump 3 only affects the volume and the liquid level of the crystallization separator 2 by less than 25% of the traditional process in the process of discharging solids in the crystallization separator 2, the liquid level control of the crystallization separator 2 is more accurate, the whole system can be ensured to realize continuous and uninterrupted salt discharge, the abrasion of pipelines and overflowing parts is reduced, and the control level is greatly improved.

Concentration is carried out through the cyclone station 4, salt slurry entering the thickener 5 can be guaranteed to be at a high concentration level, the amount of clear liquid entering the thickener 5 is reduced, and the amount of solid entering the thickener is increased, so that the thickener 5 can be designed to be relatively small, and the occupied area is reduced.

Thickener 5 receives the thick brine slurry from the underflow of cyclone station 4 and performs secondary settling and concentration again in thickener 5. The salt slurry at the bottom of the thickener 5 enters a centrifuge 6 for dehydration, solid salt is directly discharged from a salt outlet at the bottom, the dehydrated clear liquid enters a mother liquid pool 7, and the clear liquid in the mother liquid pool 7 returns to the crystallization separator 2 through a circulating pipeline. A mother liquor reflux pump 8 can be arranged on the pipeline of the mother liquor pool connecting with the circulating pipeline.

Because the relative quantity of the salt slurry entering the thickener 5 is small, the thickener 5 can be ensured to overflow less or not, the thickener 5 carries out salt extraction in an intermittent operation mode, the salt extraction concentration ratio is improved, the efficient allocation of manpower is realized, meanwhile, the volume of the mother liquor pool can be controlled at the minimum level, and the mother liquor reflux pump can also realize intermittent small-flow operation.

Of course, in order to effectively control the overflow, the thickener 5 may be provided with an overflow port, which is connected to the mother liquor tank 7 through a pipeline. Once overflow occurs, the overflow clear liquid overflows from the overflow port into the mother liquor tank 7, ensuring that the overflow amount is at a low level.

A stirrer is generally arranged in the thickener 5, and the stirrer can be connected with a torque sensor for monitoring the salt solid content in the thickener 5 in real time. The use of the torque sensor can monitor the amount of the salt solid in the thickener 5 on line, and ensure that the stirrer of the thickener 5 is not stopped by the salt solid.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (7)

1. An evaporator discharging system is characterized by comprising a crystallization separator provided with a material inlet, a forced circulation heat exchanger, a forced circulation pump, a discharging pump, a cyclone station, a thickener, a centrifugal machine and a mother liquid pool, wherein the forced circulation heat exchanger, the crystallization separator and the forced circulation pump are sequentially connected through a circulation pipeline to form a circulation loop, and secondary steam generated by the crystallization separator enters the forced circulation heat exchanger after being heated by a compressor; the discharge gate of crystal separator passes through the feed inlet of tube coupling discharge pump, the discharge gate of discharge pump passes through the feed inlet of tube coupling whirl station, the backward flow mouth of tube coupling crystal separator is passed through in the top export of whirl station, and the feed inlet of tube coupling stiff ware is passed through in the bottom export of whirl station, stiff ware exit linkage centrifuge entry, mother liquor pond is connected to centrifuge's liquid outlet, mother liquor pond passes through tube coupling to circulating line.

2. The evaporator discharge system of claim 1, wherein the crystallization separator is provided with two discharge ports, namely a first discharge port located at the middle lower part of the crystallization separator and a second discharge port located at the bottom of the salt leg of the crystallization separator, and the first discharge port and the second discharge port are respectively connected with a discharge pump through pipelines.

3. The evaporator discharge system of claim 1 wherein the thickener is provided with an overflow port that is connected to a mother liquor pond via a conduit.

4. The evaporator discharge system of claim 1 wherein a stirrer is provided in the thickener, and the stirrer is connected with a torque sensor for real-time monitoring of the salt solid content in the thickener.

5. The evaporator discharge system of claim 1 wherein a mother liquor reflux pump is provided on the conduit connecting the mother liquor tank to the circulation conduit.

6. The evaporator discharging system according to claim 1, wherein a pump discharging adjusting valve for adjusting discharging of the discharging pump is arranged on a pipeline connected with the discharging port of the discharging pump.

7. The evaporator discharging system according to claim 2, wherein a first discharging regulating valve for regulating the discharging of the crystallization separator is arranged on a pipeline connecting the discharging pump and the first discharging port, and a second discharging regulating valve for regulating the discharging of the crystallization separator is arranged on a pipeline connecting the discharging pump and the second discharging port.

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