CN205472703U - Take strong brine crystal separation device of mother liquor separator - Google Patents

Abstract

A concentrated brine crystallization and separation device with a mother liquid separator relates to waste water treatment technology in the field of environmental protection technology. The utility model comprises a crystallizer, a circulation pump and a heater which are sequentially connected to form a circulation pipeline. The bottom of the conical cavity in the lower part of the crystallizer is provided with washing legs. Its structural feature is that a mother liquor separator is connected between the crystallizer and the circulation pump. The cavity of the mother liquor separator is provided with upper and lower layers of crystallization salt baffles, and the positions corresponding to the two crystallization salt baffles on the side wall of the mother liquor separator are respectively provided with mother liquor discharge ports. Compared with the prior art, the utility model is directly connected to the circulation pipeline of the concentrated brine crystallization system, which can effectively separate the mother liquor from the crystallization salt, avoid heat loss in the system and greatly reduce the amount of crystallization salt carried by the discharge of the mother liquor.

Description

Concentrated brine crystallization separation device with mother liquor separator

technical field

The utility model relates to waste water treatment technology in the field of environmental protection technology, in particular to a concentrated brine crystallization and separation device with a mother liquid separator.

Background technique

Petroleum, coal chemical industry, electric power and other industrial production will produce a large amount of saline wastewater. After the wastewater is reused, a small amount of high saline wastewater will be produced. In the prior art, a crystallization system including a crystallizer is usually used to continue concentrating saline wastewater to achieve zero or near-zero discharge of wastewater, and finally produce a certain amount of solid waste containing various inorganic salts and organic substances. Since this kind of solid waste is defined as hazardous waste in my country, the treatment cost is extremely high, which leads to a sharp increase in operating costs.

According to the composition analysis of the above solid waste, inorganic salts account for the vast majority, especially the content of two mixed salts of NaCl and Na ₂ SO ₄ exceeds 90%. If the mixed salt is separated from other substances, more than 90% of solid waste can be reduced. At the same time, NaCl and Na ₂ SO ₄ mixed salt can also be used as raw materials for the salt-nitration co-production industry, which not only greatly reduces the landfill cost of solid waste , It can also turn waste into wealth and produce certain economic benefits.

Contents of the invention

Aiming at the deficiencies in the above-mentioned prior art, the purpose of this utility model is to provide a concentrated brine crystallization and separation device with a mother liquor separator. It is directly connected to the circulation pipeline of the concentrated brine crystallization system, which can effectively separate the mother liquor from the crystallization salt. During the separation process, the temperature of the circulating brine is basically unchanged, avoiding heat loss in the system and greatly reducing the crystallization salt carried by the discharge of the mother liquor. quantity.

In order to achieve the above-mentioned purpose of the invention, the technical solution of the utility model is realized in the following manner:

A concentrated brine crystallization and separation device with a mother liquor separator, which includes a crystallizer, a circulation pump and a heater connected in sequence to form a circulation pipeline. The bottom of the conical cavity in the lower part of the crystallizer is provided with washing legs. Its structural feature is that a mother liquor separator is connected between the crystallizer and the circulating pump. The cavity of the mother liquor separator is provided with upper and lower layers of crystallization salt baffles, and the positions corresponding to the two crystallization salt baffles on the side wall of the mother liquor separator are respectively provided with mother liquor discharge ports.

Because the utility model adopts the above-mentioned structure, the crystallization salt and the mother liquor are respectively discharged through the washing leg at the lower part of the crystallizer and the mother liquor separator, so as to maintain the salt content of the whole system. During the separation process, the temperature of the circulating brine is basically unchanged, and the space is greatly saved at the same time. The utility model has a simple structure, and can separate crystals and mother liquor through simple gravity separation.

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the connection schematic diagram of the present utility model;

Fig. 2 is the structural representation of the mother liquid separator in the utility model.

detailed description

Referring to Fig. 1 and Fig. 2, the concentrated brine crystallization separation device with mother liquor separator of the present utility model, it comprises the crystallizer 1 that is connected to form circulation line successively, mother liquor separator 3, circulation pump 5 and heater 11. A washing leg 7 is provided at the bottom of the conical chamber at the lower part of the crystallizer 1 . The cavity of the mother liquor separator 3 is provided with upper and lower layers of crystalline salt baffles 6 , and the positions corresponding to the two crystallization salt baffles 6 on the side wall of the mother liquor separator 3 are respectively provided with mother liquor discharge ports 4 .

During the operation of the utility model, the salt grains in the crystallizer 1 continuously collide with the flow of hot brine and the action of gravity to form larger grains, forming crystal clusters, and move to the outside of the washing legs 7 with the flow of brine tank wall direction. Because the density of the crystal grains is greater than that of the brine, the crystal grains move downwards and constantly "grow up" until they drop to the vicinity of the water entry point on the top of the washing leg 7, and the crystallized salt is discharged from the discharge port 9. The mother liquor separator 3 adopts the gravity separation design to discharge the mother liquor, which can effectively prevent the crystals from being discharged with the mother liquor. The crystallized brine that is rich in crystals from the side wall of the crystallizer 1 flows vertically downward along the circulation pipe. When flowing through the vertically installed mother liquor separator 3, the specific gravity of the crystals is greater than that of the brine. Due to the effect of gravity, the crystals flow downward. sports. After the crystals are blocked by the baffle 6 in the mother liquor separator 3, they continue to move vertically downward, while the concentrated brine liquid without crystal salt can bypass the baffle 6 and overflow from the mother liquor discharge port 4 at the high point. The external steam enters the heating chamber of the heater 11 through the air inlet 10 , and the condensate after heat exchange is discharged through the discharge port 12 on the heater 11 . After the steam in the crystallizer 1 passes through the secondary demister 13, it is discharged from the discharge port 15 on the side wall of the conical cavity at the upper part of the crystallizer 1.

Claims (1)

1. the strong brine Crystallization Separation device of band mother solution separator, it includes being in turn connected to form the crystallizer (1) of circulation line, circulating pump (5) and heater (11), the bottom in crystallizer (1) lower taper chamber is provided with washing lower limb (7), it is characterized in that, mother solution separator (3) is connected between described crystallizer (1) and circulating pump (5), being provided with upper and lower two-layer crystal salt baffle plate (6) in the cavity of mother solution separator (3), position corresponding with two crystal salt baffle plates (6) on mother solution separator (3) sidewall is respectively equipped with mother solution floss hole (4).