CN218900880U

CN218900880U - Device for continuously extracting ammonium sulfate from ammonium sulfate mother liquor

Info

Publication number: CN218900880U
Application number: CN202223047479.3U
Authority: CN
Inventors: 常立国; 徐文昌; 雷阳; 赵磊; 谭植强; 王胜光; 郭迎涛; 鲍凯
Original assignee: Linqing Deneng Goldencorn Biological Co ltd; SHANDONG SHOUGUANG JUNENG GROUP GOLDEN CORN CO LTD; Shouguang Golden Far East Modified Starch Co ltd; Shouguang Jinyumi Biotechnology Co ltd
Current assignee: Linqing Deneng Goldencorn Biological Co ltd; SHANDONG SHOUGUANG JUNENG GROUP GOLDEN CORN CO LTD; Shouguang Golden Far East Modified Starch Co ltd; Shouguang Jinyumi Biotechnology Co ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2023-04-25
Anticipated expiration: 2032-11-16

Abstract

The utility model discloses a device for continuously extracting ammonium sulfate from ammonium sulfate mother liquor, which belongs to the field of ammonium sulfate preparation devices and comprises a circulating cooling crystallization unit, wherein the feeding end of the circulating cooling crystallization unit is connected with a mother liquor tank, the discharging end of the circulating cooling crystallization unit is connected with a cyclone, the cyclone is provided with a crystallization mixed liquor outlet, and the crystallization mixed liquor outlet is connected with a centrifugal machine; the utility model can improve the recovery rate of the ammonium sulfate mother liquor and reduce the loss of ammonium sulfate; and the equipment investment is reduced, and the problems of environmental protection pressure and high production cost caused by reheating, evaporation and extraction can be avoided.

Description

Device for continuously extracting ammonium sulfate from ammonium sulfate mother liquor

Technical Field

The utility model relates to a device for continuously extracting ammonium sulfate from ammonium sulfate mother liquor, and belongs to the field of ammonium sulfate preparation devices.

Background

The ammonium sulfate is an important chemical raw material and is widely applied to various production and living fields, and the biggest purpose of the ammonium sulfate is to manufacture nitrogenous fertilizer, so that plant branches and leaves can grow vigorously, the quality and the yield of manuscript fruits are improved, and the disaster resistance of crops is enhanced. Meanwhile, the usage amount of rare earth ores in biology, medicine, chemical industry, food and the like is continuously increased. The price of ammonium sulfate has been increasing in recent years, and the market price of sulfuric acid is 1700 yuan/ton.

In the prior art, two methods are used for preparing ammonium sulfate, firstly, the contact method is used for preparing the ammonium sulfate, a raw material for generating sulfur dioxide is needed in the production process to continuously produce sulfur trioxide, the method is generally adopted in enterprises of power plants or other desulfurization processes, the yield is influenced by a front-end process, and the yield are unstable.

Secondly, evaporating and crystallizing, namely continuously increasing the concentration and the dry matter ratio of an ammonium sulfate solution through evaporation of an evaporator to form the ammonium sulfate crystallization solution, introducing the ammonium sulfate crystallization solution into a centrifugal machine for separation, and filtering mother liquor to obtain an ammonium sulfate crystallization product; the content of ammonium sulfate in the mother solution is about 35%, the ammonium sulfate loss rate is high, and the yield is low; generally, the pressure of environmental protection is formed by reheating, evaporating and extracting, and the production cost is high.

In summary, it is clear that the prior art has inconvenience and defects in practical use, so that improvement is needed.

Disclosure of Invention

Aiming at the defects, the utility model provides a device for continuously extracting ammonium sulfate from ammonium sulfate mother liquor, which can improve the recovery rate of the ammonium sulfate mother liquor and reduce the loss of ammonium sulfate; and the equipment investment is reduced, and the problems of environmental protection pressure and high production cost caused by reheating, evaporation and extraction can be avoided.

In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a follow device that continues to draw ammonium sulfate in ammonium sulfate mother liquor, includes circulation cooling crystallization unit, the feed end and the mother liquor jar of circulation cooling crystallization unit are connected, and the discharge end and the swirler of circulation cooling crystallization unit are connected, the swirler has crystallization mixed solution export, crystallization mixed solution export is connected with centrifuge.

Further, the circulating cooling crystallization unit comprises a tube heat exchanger and a circulating pipeline, and cooling water is introduced into the tube side of the tube heat exchanger; the lower end and the upper end of the tube side of the tubular heat exchanger are respectively connected with a water inlet pipeline and a water outlet pipeline.

Further, the upper end and the lower end of the shell side of the shell-and-tube heat exchanger are respectively provided with a material inlet and a material outlet, and the circulating pipeline is connected with the material inlet and the material outlet of the shell side of the shell-and-tube heat exchanger.

Further, a circulating pump and a first valve are arranged on the circulating pipeline.

Further, a feeding pipeline is communicated with the circulating pipeline and is connected between the circulating pump and a shell side inlet of the shell side heat exchanger, and the other end of the feeding pipeline is connected with a mother liquid tank.

Further, the circulating pipeline is communicated with a discharge pipeline, and the discharge pipeline is communicated with a material inlet on the cyclone; a third valve is arranged on the discharging pipeline; the discharging pipeline is arranged between the interface of the feeding pipeline and the circulating pump.

Further, the feed line is provided with a second valve and a feed pump.

Further, the cyclone is provided with a supernatant outlet, the supernatant outlet is connected with a return pipe, and the other end of the return pipe is connected with a mother liquid tank.

After the technical scheme is adopted, compared with the prior art, the utility model has the following advantages:

the utility model fully utilizes the characteristic that the temperature of the ammonium sulfate mother liquor is higher (about 50 DEG) after the evaporator is used for evaporating and crystallizing, and utilizes the temperature difference to crystallize the mother liquor material at low temperature; the recovery rate of the ammonium sulfate mother liquor is improved, and the ammonium sulfate loss is reduced; and the equipment investment is less, and the problems of environmental protection pressure and high production cost caused by reheating, evaporation and extraction are avoided.

The utility model will now be described in detail with reference to the drawings and examples.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

In the drawing the view of the figure,

1-mother liquor tank, 2-feeding pipeline, 3-feeding pump, 4-tubular heat exchanger, 5-water inlet pipeline, 6-water outlet pipeline, 7-circulation pipeline, 8-circulation pump, 9-cyclone, 91-supernatant outlet, 92-crystallization mixed liquor outlet, 10-centrifuge, 11-return pipe, 12-first valve, 13-second valve, 14-third valve and 15-discharge pipeline.

Detailed Description

For a clearer understanding of technical features, objects, and effects of the present utility model, a specific embodiment of the present utility model will be described with reference to the accompanying drawings.

Example 1

As shown in fig. 1, the utility model provides a device for continuously extracting ammonium sulfate from ammonium sulfate mother liquor, which comprises a circulating cooling crystallization unit, wherein the feeding end of the circulating cooling crystallization unit is connected with a mother liquor tank 1, the discharging end of the circulating cooling crystallization unit is connected with a cyclone 9, the cyclone 9 is provided with a supernatant outlet 91 and a crystallization mixed liquor outlet 92, and the crystallization mixed liquor outlet 92 is connected with a centrifugal machine 10.

Furthermore, the circulating cooling crystallization unit comprises a tube nest heat exchanger 4, cooling water is introduced into the tube side of the tube nest heat exchanger 4, and the lower end and the upper end of the tube side of the tube nest heat exchanger 4 are respectively connected with a water inlet pipeline 5 and a water outlet pipeline 6.

The upper end and the lower end of the shell side of the tubular heat exchanger 4 are respectively provided with a material inlet and a material outlet, the material inlet and the material outlet of the shell side of the tubular heat exchanger 4 are connected through a circulating pipeline 7, and the circulating pipeline 7 is provided with a circulating pump 8 and a first valve 12.

The temperature difference between the materials at the inlet and the outlet of the shell side of the shell-and-tube heat exchanger 4 is 15 ℃.

The circulating pipeline 7 is communicated with a feeding pipeline 2, the feeding pipeline 2 is connected between the circulating pump 8 and the shell side inlet of the shell side heat exchanger 4, the other end of the feeding pipeline 2 is connected with the mother liquid tank 1, and the feeding pipeline 2 is provided with a second valve 13 and a feeding pump 3.

A discharge pipeline 15 is communicated with the circulation pipeline 7, and the discharge pipeline 15 is communicated with a material inlet on the cyclone 9; a third valve 14 is arranged on the discharging pipeline 15; the discharge pipeline 15 is arranged between the interface of the feeding pipeline 2 and the circulating pipeline 7 and the circulating pump 8.

The supernatant outlet 91 of the cyclone 9 is connected with the return pipe 11, the other end of the return pipe 11 is connected with the mother liquor tank 1, and the supernatant in the cyclone 9 can be returned to the mother liquor tank 1 through the return pipe 11 for cooling crystallization again.

The working principle of the utility model is as follows:

under the action of a feed pump, the ammonium sulfate mother liquor (the temperature is about 50 ℃) in the mother liquor tank enters a circulating pipeline in a circulating cooling crystallization unit through a feed pipe, then enters a shell pass of a shell and tube heat exchanger from the upper part of the shell and tube heat exchanger, cooling water enters the tube pass of the shell and tube heat exchanger from the lower part of the shell and tube heat exchanger, the ammonium sulfate mother liquor and the cooling water exchange heat and cool down, the ammonium sulfate mother liquor material is cooled down and crystallized by utilizing the temperature difference, the ammonium sulfate mother liquor is circulated and cooled down in the circulating cooling crystallization unit, fine particles which are not easy to separate in the ammonium sulfate mother liquor are crystallized and separated out at low temperature, a third valve is opened, the ammonium sulfate mother liquor with crystals enters a cyclone through a discharge pipe, the cyclone recovers and separates the crystals, the material with high concentration is separated out by the cyclone and enters a centrifuge for separation and recovery again, and the recovery rate of ammonium sulfate is improved; the material with low concentration in the cyclone returns to the mother liquor tank through the return pipe to perform cooling crystallization again.

The foregoing is illustrative of the best mode of carrying out the utility model, and is not presented in any detail as is known to those of ordinary skill in the art. The protection scope of the utility model is defined by the claims, and any equivalent transformation based on the technical teaching of the utility model is also within the protection scope of the utility model.

Claims

1. The utility model provides a follow device that ammonium sulfate continues to draw from ammonium sulfate mother liquor which characterized in that: the device comprises a circulating cooling crystallization unit, wherein a feeding end of the circulating cooling crystallization unit is connected with a mother liquor tank (1), a discharging end of the circulating cooling crystallization unit is connected with a cyclone (9), the cyclone (9) is provided with a crystallization mixed liquor outlet (92), and the crystallization mixed liquor outlet (92) is connected with a centrifugal machine (10).

2. An apparatus for continuing to extract ammonium sulfate from an ammonium sulfate mother liquor as claimed in claim 1, wherein: the circulating cooling crystallization unit comprises a tube heat exchanger (4) and a circulating pipeline (7), and cooling water is introduced into the tube side of the tube heat exchanger (4); the lower end and the upper end of the tube side of the tubular heat exchanger (4) are respectively connected with a water inlet pipeline (5) and a water outlet pipeline (6).

3. An apparatus for continuing to extract ammonium sulfate from an ammonium sulfate mother liquor as claimed in claim 2, wherein: the upper end and the lower end of the shell side of the tubular heat exchanger (4) are respectively provided with a material inlet and a material outlet, and the circulating pipeline (7) is connected with the material inlet and the material outlet of the shell side of the tubular heat exchanger (4).

4. An apparatus for continuing to extract ammonium sulfate from an ammonium sulfate mother liquor as claimed in claim 2, wherein: the circulating pipeline (7) is provided with a circulating pump (8) and a first valve (12).

5. An apparatus for continuing to extract ammonium sulfate from an ammonium sulfate mother liquor as defined in claim 4, wherein: the circulating pipeline (7) is communicated with a feeding pipeline (2), the feeding pipeline (2) is connected between a circulating pump (8) and a shell side inlet of the shell side heat exchanger (4), and the other end of the feeding pipeline (2) is connected with the mother liquid tank (1).

6. An apparatus for continuing to extract ammonium sulfate from an ammonium sulfate mother liquor as defined in claim 5, wherein: a discharge pipeline (15) is communicated with the circulation pipeline (7), and the discharge pipeline (15) is communicated with a material inlet on the cyclone (9); a third valve (14) is arranged on the discharging pipeline (15); the discharging pipeline (15) is arranged between the interface of the feeding pipeline (2) and the circulating pipeline (7) and the circulating pump (8).

7. An apparatus for continuing to extract ammonium sulfate from an ammonium sulfate mother liquor as defined in claim 5, wherein: the feed pipeline (2) is provided with a second valve (13) and a feed pump (3).

8. An apparatus for continuing to extract ammonium sulfate from an ammonium sulfate mother liquor as claimed in claim 1, wherein: the cyclone (9) is provided with a supernatant outlet (91), the supernatant outlet (91) is connected with a return pipe (11), and the other end of the return pipe (11) is connected with a mother liquid tank (1).