Self-cleaning system for pipeline of ammonium sulfate crystallization device

Abstract

The utility model relates to the field of chemical engineering, in particular to an ammonium sulfate crystallization device pipeline self-cleaning system which comprises a fine grain eliminator, a grain elimination heat exchanger, a vacuum crystallizer and a crystallization heat exchanger which are connected to a pipeline, and a pump body which is arranged on the pipeline and is used for driving materials to flow, a flushing branch pipe is connected to the pipeline located at the upstream of the pump body, a condensate water switch is arranged on the flushing branch pipe, the flushing branch pipe is connected with a flushing main pipe, the flushing main pipe is connected with a condensate water tank, and a condensate water pump is arranged on the flushing main pipe; and when the flow of the concentrated liquid delivery pump, the fine grain extraction pump, the crystal mush delivery pump or the clear liquid pump is obviously increased, a condensate water switch at a corresponding pipeline is turned on, and condensate water with the temperature of 80-90 DEG C generated during the operation of the ammonium sulfate crystallization device is used for washing the corresponding pipeline, so that the blockage elimination of the pipeline is realized.

Description

Technical Field

[0001] This utility model relates to the chemical industry, specifically to a self-cleaning system for pipelines in an ammonium sulfate crystallization device. Background Technology

[0002] Ammonium sulfate is an inorganic substance, and its crystallization principle is to precipitate it from the ammonium sulfate solution by increasing the supersaturation.

[0003] Existing ammonium sulfate crystallization devices, such as the utility model patent with application number CN202322971510.0, disclose a large-particle ammonium sulfate production device. A fine crystal eliminator, a crystal elimination circulation pump, and a crystal elimination heat exchanger are connected by pipelines to form an internal circulation to eliminate fine crystals. The bottom of the fine crystal eliminator is connected to a vacuum crystallizer through a pipeline. The vacuum crystallizer, the crystallization circulation pump, and the crystallization heat exchanger are connected by pipelines to form an internal circulation to obtain large-particle crystals. The crystal slurry tank at the bottom of the vacuum crystallizer is connected to the subsequent process section through a pipeline. A fine crystal outlet is set between the inlet of the slurry outlet pipe and the upper feed port of the vacuum crystallizer. The fine crystal outlet is connected to the crystal elimination heat exchanger through a fine crystal collection pump.

[0004] Existing ammonium sulfate crystallization equipment incorporates insulation at the pipelines to prevent crystallization of supersaturated solutions at low temperatures. However, insulation at pipeline flanges and junctions is difficult to implement, easily leading to pipeline blockage. Operators must constantly monitor the flow rates of each pump, judging whether a blockage has occurred by a significant drop in flow. Severe blockages necessitate disassembling the pipeline for flushing, increasing operational complexity and significantly impacting the equipment's capacity. Utility Model Content

[0005] The purpose of this invention is to provide a self-cleaning system for pipelines in an ammonium sulfate crystallization device, which automatically flushes the pipelines to eliminate blockages and solves the defects mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A self-cleaning system for an ammonium sulfate crystallization device pipeline includes a fine crystal eliminator, a crystal elimination heat exchanger, a vacuum crystallizer, and a crystallization heat exchanger connected to the pipeline, as well as a pump body installed on the pipeline for driving material flow; a flushing branch pipe is connected to the pipeline upstream of the pump body, the flushing branch pipe is equipped with a condensate switch, the flushing branch pipe is connected to the flushing main pipe, the flushing main pipe is connected to the condensate tank, and the flushing main pipe is equipped with a condensate pump.

[0008] As a further improvement, the shell side of the de-crystallization heat exchanger and the shell side of the crystallization heat exchanger are both connected to the low-pressure steam main pipe. The shell side of the de-crystallization heat exchanger and the shell side of the crystallization heat exchanger are also respectively connected to a gas-liquid separator. The gas outlet of the gas-liquid separator is connected to the corresponding shell side, and the liquid outlet of both gas-liquid separators is connected to the condensate tank.

[0009] As a further improvement, the lower end of the fine crystal eliminator is connected to the lower end of the tube side of the crystal elimination heat exchanger via a crystal elimination circulation pump, and the upper end of the tube side of the crystal elimination heat exchanger is connected to one side of the fine crystal eliminator; the lower end of the vacuum crystallizer is connected to a crystal slurry tank, and one side of the middle of the crystal slurry tank is connected to a crystallization circulation pump via a slurry outlet pipe, the crystallization circulation pump is connected to the lower end of the tube side of the crystallization heat exchanger, and the upper end of the tube side of the crystallization heat exchanger is connected to one side of the vacuum crystallizer; a concentrated liquid conveying pipe is connected between one side of the lower end of the tube side of the crystal elimination heat exchanger and one side of the tube side of the crystallization heat exchanger, and a concentrated liquid conveying pump for driving the material to flow towards the crystallization heat exchanger is provided on the concentrated liquid conveying pipe; one side of the upper end of the crystal slurry tank is connected to one side of the lower end of the fine crystal eliminator via a fine crystal collection pipe, and a fine crystal collection pump for driving the material to flow towards the fine crystal eliminator is provided on the fine crystal collection pipe; the lower end of the crystal slurry tank is connected to a discharge pipe, and a crystal slurry conveying pump for outputting the material in the crystal slurry tank is provided on the discharge pipe.

[0010] As a further improvement, the upper end of the crystal slurry tank is also connected to the discharge pipe upstream of the crystal slurry conveying pump via a clear liquid pipe, and the clear liquid pipe is equipped with a clear liquid pump for driving the material to flow into the discharge pipe.

[0011] As a further improvement, flushing branch pipes are respectively connected to the concentrated liquid delivery pipe upstream of the concentrated liquid delivery pump, the fine crystal extraction pipe upstream of the fine crystal extraction pump, the discharge pipe upstream of the crystal slurry delivery pump, and the clear liquid pipe upstream of the clear liquid pump.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] When the flow rate of the concentrated liquid transfer pump, fine crystal extraction pump, crystal slurry transfer pump, or clear liquid pump increases significantly, the condensate switch at the corresponding pipeline is turned on. The condensate generated at 80-90℃ during the operation of the ammonium sulfate crystallization unit is used to flush the corresponding pipeline, thereby clearing the blockage. The pipeline clearing efficiency is higher, thus effectively increasing the output. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0016] In the diagram: 1-Fine crystal eliminator; 2-Elimination heat exchanger; 3-Vacuum crystallizer; 301-Crystal slurry tank; 4-Crystallization heat exchanger; 5-Elimination circulation pump; 6-Raw material mother liquor input pipe; 7-Slurry outlet pipe; 8-Crystallization circulation pump; 9-Discharge pipe; 10-Crystal slurry conveying pump; 11-Concentrate conveying pipe; 12-Concentrate conveying pump; 13-Fine crystal extraction pipe; 14-Fine crystal extraction pump; 15-Clearing liquid pipe; 16-Clearing liquid pump; 17-Low-pressure steam main pipe; 18-Gas-liquid separator; 19-Condensate tank; 20-Flushing branch pipe; 21-Condensate switch; 22-Flushing main pipe; 23-Condensate pump. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1 As shown, a self-cleaning system for an ammonium sulfate crystallization device pipeline includes a fine crystal eliminator 1, a crystal elimination heat exchanger 2, a vacuum crystallizer 3, a crystallization heat exchanger 4 connected to the pipeline, and a pump body installed on the pipeline for driving the flow of materials.

[0019] Specifically, the lower end of the fine crystal eliminator 1 is connected to the lower end of the tube side of the crystal elimination heat exchanger 2 via the crystal elimination circulation pump 5. The upper end of the tube side of the crystal elimination heat exchanger 2 is connected to one side of the fine crystal eliminator 1. The material in the fine crystal eliminator 1 enters the crystal elimination circulation pump 5 and the crystal elimination heat exchanger 2, and then re-enters the fine crystal eliminator 1. An internal circulation is formed between the fine crystal eliminator 1, the crystal elimination circulation pump 5, and the crystal elimination heat exchanger 2 to eliminate fine crystals. In addition, a raw material mother liquor input pipe 6 is also connected to the upper end of the tube side of the crystal elimination heat exchanger 2.

[0020] The lower end of the vacuum crystallizer 3 is connected to a crystal slurry tank 301. One side of the middle section of the crystal slurry tank 301 is connected to a crystallization circulation pump 8 via a slurry outlet pipe 7. The crystallization circulation pump 8 is connected to the lower end of the tube side of the crystallization heat exchanger 4, and the upper end of the tube side of the crystallization heat exchanger 4 is connected to one side of the vacuum crystallizer 3. When the material particles are small, they enter the crystallization circulation pump 8 and the crystallization heat exchanger 4 through the slurry outlet pipe 7 in the middle of the crystal slurry tank 301, and then re-enter the vacuum crystallizer 3. An internal circulation is formed between the vacuum crystallizer 3, the crystallization circulation pump 8, and the crystallization heat exchanger 4 to obtain large-particle crystals.

[0021] The lower end of the crystal slurry tank 301 is connected to the discharge pipe 9. The lower end of the crystal slurry tank 301 is vertically spaced with multiple discharge ports, which are connected to the discharge pipe 9. The discharge pipe 9 is equipped with a crystal slurry conveying pump 10 for outputting the material in the crystal slurry tank 301. After the large crystal particles sink to the bottom of the crystal slurry tank 301, the large crystal particles are conveyed to the subsequent process section by the crystal slurry conveying pump 10.

[0022] A concentrated liquid conveying pipe 11 is connected between the lower end of the tube side of the crystallizer 2 and the upper end of the tube side of the crystallizer 4. A concentrated liquid conveying pump 12 is provided on the concentrated liquid conveying pipe 11 to drive the material to flow to the crystallizer 4 and to convey the concentrated liquid in the fine crystal eliminator 1 to the vacuum crystallizer 3.

[0023] The upper end of the crystal slurry tank 301 is connected to the lower end of the fine crystal remover 1 via a fine crystal collection pipe 13. The fine crystal collection pipe 13 is equipped with a fine crystal collection pump 14 for driving the material to flow towards the fine crystal remover 1. Because the fine crystals in the crystal slurry tank 301 are lighter, they float on the surface of the material. The fine crystal collection pump 14 transports the fine crystals on the surface of the crystal slurry tank 301 to the fine crystal remover 1, thereby achieving the purpose of removing fine crystals.

[0024] In addition, the upper side of the crystal slurry tank 301 is connected to the discharge pipe 9 upstream of the crystal slurry conveying pump 10 through the clear liquid pipe 15. The clear liquid pipe 15 is equipped with a clear liquid pump 16 for driving the material to flow to the discharge pipe 9. The clear liquid pump 16 extracts the fine crystals floating on the upper layer of the crystal slurry tank 301, and then the crystal slurry conveying pump 10 transports the fine crystals to the subsequent process to obtain crystals of different particles.

[0025] The shell side of both the de-crystallization heat exchanger 2 and the crystallization heat exchanger 4 are connected to the low-pressure steam main 17 via pipelines. The shell side of the de-crystallization heat exchanger 2 is connected to a gas-liquid separator 18 via a pipeline, and the outlet of this gas-liquid separator 18 is reconnected to the shell side of the de-crystallization heat exchanger 2 via a pipeline. The shell side of the crystallization heat exchanger 4 is connected to another gas-liquid separator 18 via a pipeline, and the outlet of this gas-liquid separator 18 is reconnected to the shell side of the crystallization heat exchanger 4 via a pipeline. The liquid outlets of both gas-liquid separators 18 are connected to a condensate tank 19 via pipelines. During the steam heating process of the de-crystallization heat exchanger 2 and the crystallization heat exchanger 4, the generated condensate is separated by the corresponding gas-liquid separators 18 and flows to the condensate tank 19 for collection.

[0026] Flushing branch pipes 20 are connected to the concentrated liquid delivery pipe 11 upstream of the concentrated liquid delivery pump 12, the fine crystal production pipe 13 upstream of the fine crystal production pump 14, the discharge pipe 9 upstream of the crystal slurry delivery pump 10, and the clear liquid pipe 15 upstream of the clear liquid pump 16, respectively. Each flushing branch pipe 20 is equipped with a condensate switch 21. Multiple flushing branch pipes 20 are connected to a main flushing pipe 22, which is connected to a condensate tank 19. A condensate pump 23 is installed on the main flushing pipe 22. By opening the condensate switch 21, condensate water at 80-90℃ generated during the operation of the device can be used to flush the corresponding pipes.

[0027] In practical use, the flow rates and frequencies of the concentrated liquid transfer pump 12, fine crystal extraction pump 14, crystal slurry transfer pump 10, and clear liquid pump 16 are interlocked. The pump flow rate is set to a fixed value, and the pump automatically adjusts its frequency to ensure that the flow rate is a fixed value. The pump frequency is used to determine the blockage status of the corresponding pipeline. The pump flow rate is interlocked with the corresponding condensate switch 21. When the pump flow rate is a fixed value, a significant increase in frequency indicates that the corresponding pipeline is starting to be blocked. The corresponding condensate switch is then turned on to flush the pipeline for 30 seconds to clear the blockage.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A self-cleaning system for pipelines in an ammonium sulfate crystallization device, characterized in that: It includes a fine crystal eliminator (1), a crystal elimination heat exchanger (2), a vacuum crystallizer (3), a crystallization heat exchanger (4) connected to the pipeline, and a pump body installed on the pipeline for driving the flow of materials; a flushing branch pipe (20) is connected to the pipeline located upstream of the pump body, the flushing branch pipe (20) is equipped with a condensate switch (21), the flushing branch pipe (20) is connected to the flushing main pipe (22), the flushing main pipe (22) is connected to the condensate tank (19), and the flushing main pipe (22) is equipped with a condensate pump (23).

2. The self-cleaning system for pipelines of an ammonium sulfate crystallization device as described in claim 1, characterized in that: The shell side of the de-crystallization heat exchanger (2) and the shell side of the crystallization heat exchanger (4) are both connected to the low-pressure steam main pipe. The shell side of the de-crystallization heat exchanger (2) and the shell side of the crystallization heat exchanger (4) are also connected to a gas-liquid separator (18). The gas outlet of the gas-liquid separator (18) is connected to the corresponding shell side. The liquid outlet of both gas-liquid separators (18) is connected to the condensate tank (19).

3. The self-cleaning system for pipelines of an ammonium sulfate crystallization device as described in claim 1, characterized in that: The lower end of the fine crystal eliminator (1) is connected to the lower end of the tube side of the crystal eliminator heat exchanger (2) via a crystal eliminator circulation pump (5), and the upper end of the tube side of the crystal eliminator heat exchanger (2) is connected to one side of the fine crystal eliminator (1); the lower end of the vacuum crystallizer (3) is connected to a crystal slurry tank (301), and one side of the middle part of the crystal slurry tank (301) is connected to a crystallization circulation pump (8) via a slurry outlet pipe (7), the crystallization circulation pump (8) is connected to the lower end of the tube side of the crystallization heat exchanger (4), and the upper end of the tube side of the crystallization heat exchanger (4) is connected to one side of the vacuum crystallizer (3); one side of the lower end of the tube side of the crystal eliminator heat exchanger (2) is connected to the crystallization heat exchanger (4). A concentrated liquid conveying pipe (11) is connected between the upper end of the tube side of the crystallizer (4), and a concentrated liquid conveying pump (12) is provided on the concentrated liquid conveying pipe (11) to drive the material to flow to the crystallizer (4); the upper end of the crystal slurry tank (301) is connected to the lower end of the fine crystal eliminator (1) through a fine crystal collection pipe (13), and a fine crystal collection pump (14) is provided on the fine crystal collection pipe (13) to drive the material to flow to the fine crystal eliminator (1); the lower end of the crystal slurry tank (301) is connected to a discharge pipe (9), and a crystal slurry conveying pump (10) is provided on the discharge pipe (9) to output the material in the crystal slurry tank (301).

4. The self-cleaning system for pipelines of an ammonium sulfate crystallization device as described in claim 3, characterized in that: The upper end of the crystal slurry tank (301) is also connected to the discharge pipe (9) upstream of the crystal slurry conveying pump (10) via a clear liquid pipe (15). The clear liquid pipe (15) is equipped with a clear liquid pump (16) for driving the material to flow to the discharge pipe (9).

5. The self-cleaning system for pipelines of an ammonium sulfate crystallization device as described in claim 4, characterized in that: The flushing branch pipes (20) are respectively connected to the concentrated liquid delivery pipe (11) upstream of the concentrated liquid delivery pump (12), the fine crystal extraction pipe (13) upstream of the fine crystal extraction pump (14), the discharge pipe (9) upstream of the crystal slurry delivery pump (10), and the clear liquid pipe (15) upstream of the clear liquid pump (16).

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